阅读说明：本技术 一种led直管灯 (LED straight lamp ) 是由 江涛 李丽琴 杨晓苏 杨俊� 张跃强 王成 杨昌 王宝 孙骁 熊爱明 胡赫尘 于 2015-09-25 设计创作，主要内容包括：本发明提供一种LED直管灯,其特征在于：包括灯管、套设于所述灯管的灯头、设于灯管内的灯板,所述灯管为玻璃灯管,所述灯头包括导热部及空心导电针；所述导热部和所述灯管之间通过热熔胶粘接固定,所述灯管包括一主体部和分别位于所述主体部两端的端部,所述端部的外径小于所述主体部的外径,所述灯头套设于所述端部。(The invention provides an LED straight lamp, which is characterized in that: the lamp comprises a lamp tube, a lamp cap sleeved on the lamp tube and a lamp panel arranged in the lamp tube, wherein the lamp tube is a glass lamp tube, and the lamp cap comprises a heat conducting part and a hollow conducting pin; the lamp tube comprises a main body part and end parts respectively positioned at two ends of the main body part, the outer diameter of the end parts is smaller than that of the main body part, and the lamp cap is sleeved at the end parts.)

1. A LED straight lamp which is characterized in that: the lamp comprises a lamp tube, a lamp cap sleeved on the lamp tube and a lamp panel arranged in the lamp tube, wherein the lamp tube is a glass lamp tube, and the lamp cap comprises a heat conducting part and a hollow conducting pin; the lamp tube comprises a main body part and end parts respectively positioned at two ends of the main body part, the outer diameter of the end parts is smaller than that of the main body part, and the lamp cap is sleeved at the end parts.

2. The LED straight tube lamp according to claim 1, wherein: a transition portion is formed between the end portion and the main body portion.

3. The LED straight tube lamp according to claim 2, wherein: both ends of the transition part are cambered surfaces.

4. The LED straight tube lamp according to claim 2, wherein: an arc surface is arranged between the outer surface of the transition part and the outer surface of the main body part.

5. The LED straight tube lamp according to claim 2, wherein: the transition part is an inverted S-shaped curved surface formed by two cambered surfaces.

6. The LED straight lamp according to claim 5, wherein: the curvature radius ratio of the two cambered surfaces is 1: 1.5-1: 10.

7. The LED straight lamp according to claim 6, wherein: the curvature radius ratio of the two cambered surfaces is 1: 1.25-1: 5.

8. The LED straight tube lamp according to any one of claims 2 to 7, wherein: the length of transition portion is 1mm to 4 mm.

9. The LED straight tube lamp according to any one of claims 2 to 7, wherein: the outer surface of the end portion is a continuous surface and is parallel to the outer surface of the main body portion.

10. The LED straight tube lamp according to claim 1, wherein: the hot melt adhesive comprises welding paste powder, and the hot melt adhesive expands after being heated and solidifies after being cooled so as to realize that the lamp holder is fixed on the lamp tube.

11. The LED straight tube lamp according to claim 1 or 10, wherein: an accommodating space is formed between the heat conducting part and the lamp tube, and the hot melt adhesive is filled in the accommodating space.

12. The LED straight tube lamp according to claim 11, wherein: the lamp holder is all metal, and the lower part of the hollow conductive needle is provided with an insulator.

13. The LED straight tube lamp according to claim 1, wherein: the outer diameter of the lamp cap is equal to the outer diameter of the main body.

14. The LED straight tube lamp according to claim 1 or 13, wherein: the difference between the end part and the outer diameter of the main body part is 1mm to 10 mm.

15. The LED straight tube lamp according to claim 14, wherein: the difference between the outer diameter of the end part and the outer diameter of the main body part is 2mm to 7 mm.

16. The LED straight tube lamp according to claim 1, wherein: the inner peripheral surface of the lamp tube is coated with a diffusion coating, the diffusion coating is coated on the end surface of the end part of the lamp tube, and the hot melt adhesive covers the surface of the diffusion coating on the end surface.

17. A LED straight lamp which is characterized in that: the lamp comprises a lamp tube, a lamp cap sleeved on the lamp tube and a lamp panel arranged in the lamp tube, wherein the lamp tube is a glass lamp tube, and the lamp cap comprises a heat conducting part and a hollow conducting pin; the heat conducting part and the lamp tube are fixedly bonded through hot melt adhesive, the lamp tube comprises a main body part and end parts respectively positioned at two ends of the main body part, the outer diameter of the end parts is smaller than that of the main body part, and the lamp cap is sleeved on the end parts; a transition part is formed between the end part and the main body part; the length of the transition part is 1mm to 4 mm; the outer diameter of the lamp cap is equal to that of the main body part; the lamp holder is all metal, and an insulator is arranged at the lower part of the hollow conductive needle; the difference between the outer diameter of the end part and the outer diameter of the main body part is 1mm to 10 mm; the inner peripheral surface of the lamp tube is coated with a diffusion coating, the diffusion coating is coated on the end surface of the end part of the lamp tube, and the hot melt adhesive covers the surface of the diffusion coating on the end surface; the lamp holder is provided with a hole for heat dissipation.

18. The LED straight tube lamp according to claim 17, wherein: the friction force between the diffusion coating and the hot melt adhesive is larger than the friction force between the end part of the lamp tube and the hot melt adhesive when the diffusion coating is not coated.

19. The LED straight tube lamp according to claim 17, wherein: both ends of the transition part are cambered surfaces.

20. The LED straight tube lamp according to claim 17, wherein: an arc surface is arranged between the outer surface of the transition part and the outer surface of the main body part.

21. The LED straight tube lamp according to claim 17, wherein: the transition part is an inverted S-shaped curved surface formed by two cambered surfaces.

22. The LED straight tube lamp according to claim 21, wherein: the curvature radius ratio of the two cambered surfaces is 1: 1.5-1: 10.

23. The LED straight tube lamp according to claim 22, wherein: the curvature radius ratio of the two cambered surfaces is 1: 1.25-1: 5.

24. The LED straight tube lamp according to any one of claims 17 to 23, wherein: the outer surface of the end portion is a continuous surface and is parallel to the outer surface of the main body portion.

25. The LED straight tube lamp according to claim 17, wherein: the hot melt adhesive comprises welding paste powder, and the hot melt adhesive expands after being heated and solidifies after being cooled so as to realize that the lamp holder is fixed on the lamp tube.

26. The LED straight tube lamp according to claim 17 or 25, wherein: an accommodating space is formed between the heat conducting part and the lamp tube, and the hot melt adhesive is filled in the accommodating space.

Technical Field

The invention relates to the field of lighting appliances, in particular to an LED straight lamp.

Background

The LED straight lamp generally comprises a lamp tube, a lamp panel arranged in the lamp tube and provided with a light source, and lamp caps arranged at two ends of the lamp tube, wherein a power supply is arranged in each lamp cap, and the light source is electrically connected with the power supply through the lamp panel.

The existing LED straight lamp is easy to have the following quality problems:

firstly, in the existing LED straight tube lamp, silica gel or white glue is usually used for bonding between a lamp cap and a lamp tube, after the lamp cap is directly sleeved, the condition that the glue overflows is not easy to control, and if redundant glue is not removed, the appearance is influenced, and the shading problem is caused; if excess glue is to be removed, a significant amount of labor is required to wipe the adhesive at a later stage in the manufacturing process, which can affect throughput. In addition, the poor heat dissipation of the power supply module in the lamp holder easily leads to the formation of a high-temperature environment in the lamp holder, so that the service life of the hot melt adhesive is reduced, meanwhile, the adhesion between the lamp tube and the lamp holder is reduced, and the reliability of the LED straight tube lamp is reduced.

Second, the lamp tube of the prior art is generally a uniform cylinder, and the cap is disposed outside the lamp tube and bonded to the lamp tube by adhesive, so that the outer diameter of the cap is larger than the outer diameter of the lamp tube. During packaging, the packaging supporting object is generally a uniform cylindrical box body, so that the packaging supporting object can only be contacted with the lamp holder, the lamp holder becomes a unique stress point, and the connecting part of the lamp holder and the lamp tube is easy to break in the transportation process. In view of this, U.S. patent application No. US20100103673A discloses a straight LED lamp, in which the lamp tube is a glass lamp tube, and the lamp head is inserted into the glass lamp tube, so that the two ends of the glass lamp tube bear a force from inside to outside. However, the glass tube can bear a small force from inside to outside relative to the direction from outside to inside, so that the LED straight tube lamp is easy to break under the same force application condition.

Thirdly, in the existing LED straight tube lamp, the light source is a plurality of LED dies arranged on the lamp panel, and for each die, because of the characteristics of the point light source, the light is not properly optically processed, and the illumination in the whole lamp tube is not uniform, so that when a user observes the lamp tube from the outside, the lamp tube has granular sensation and affects the comfort of vision; and the light emitted by the light source cannot be seen from other angles, and the defect of visual angle is caused.

The utility model discloses a plastic tubing electromagnetism melts connection structure in the chinese utility model patent of the bulletin number of authorizing CN 201954169U, the bulletin date of authorizing for 2011 8 month 31, it includes plastic tubing and plastic pipe spare, plastic pipe spare have the link of two at least intercommunications, and at least one link system has outer rampart and be in outer rampart inboard forms the socket, the plastic tubing insert the socket in, outer rampart and plastic tubing between put with the two welded fusion ring. The electromagnetic fusion connecting structure of the plastic pipe realizes fusion connection of the plastic pipe fitting and the pipe through the fusion connection ring. The LED straight tube lamp product needs to prevent a plastic part (such as an insulating pad at the end part of the lamp cap) on the lamp cap from being melted and damaged, and a power supply needs to prevent the plastic part from being damaged due to overhigh temperature, so the plastic tube electromagnetic melting connection structure is not suitable for the LED straight tube lamp product.

Disclosure of Invention

The invention provides a novel LED straight lamp to solve the problems.

The embodiment of the invention provides an LED straight lamp, which is characterized in that: the lamp comprises a lamp tube, a lamp cap sleeved on the lamp tube and a lamp panel arranged in the lamp tube, wherein the lamp tube is a glass lamp tube, and the lamp cap comprises a heat conducting part and a hollow conducting pin; the lamp tube comprises a main body part and end parts respectively positioned at two ends of the main body part, the outer diameter of the end parts is smaller than that of the main body part, and the lamp cap is sleeved at the end parts.

In the embodiment of the invention, a transition part is formed between the end part and the main body part.

Both ends of the transition part in the embodiment of the invention are cambered surfaces.

In the embodiment of the invention, an arc surface is arranged between the outer surface of the transition part and the outer surface of the main body part.

The transition part of the embodiment of the invention is an inverted S-shaped curved surface formed by two arc surfaces.

The curvature radius ratio of the two cambered surfaces is 1: 1.5-1: 10.

The curvature radius ratio of the two cambered surfaces is 1: 1.25-1: 5.

The length of the transition part in the embodiment of the invention is 1mm to 4 mm.

The outer surface of the end part of the embodiment of the invention is a continuous surface and is parallel to the outer surface of the main body part.

The hot melt adhesive comprises welding paste powder, and the hot melt adhesive expands after being heated and solidifies after being cooled so as to fix the lamp holder on the lamp tube.

In the embodiment of the invention, an accommodating space is formed between the heat conducting part and the lamp tube, and the hot melt adhesive is filled in the accommodating space.

The lamp cap in the embodiment of the invention is all-metal, and the lower part of the hollow conductive needle is provided with an insulator.

The outer diameter of the lamp cap is equal to that of the main body part.

The difference between the outer diameters of the end part and the main body part in the embodiment of the invention is 1 mm-10 mm.

The difference between the outer diameters of the end part and the main body part in the embodiment of the invention is 2mm to 7 mm.

The inner peripheral surface of the lamp tube is coated with the diffusion coating, the diffusion coating is coated on the end surface of the end part of the lamp tube, and the hot melt adhesive covers the surface of the diffusion coating on the end surface.

The embodiment of the invention also provides an LED straight lamp, which is characterized in that: the lamp comprises a lamp tube, a lamp cap sleeved on the lamp tube and a lamp panel arranged in the lamp tube, wherein the lamp tube is a glass lamp tube, and the lamp cap comprises a heat conducting part and a hollow conducting pin; the heat conducting part and the lamp tube are fixedly bonded through hot melt adhesive, the lamp tube comprises a main body part and end parts respectively positioned at two ends of the main body part, the outer diameter of the end parts is smaller than that of the main body part, and the lamp cap is sleeved on the end parts; a transition part is formed between the end part and the main body part; the length of the transition part is 1mm to 4 mm; the outer diameter of the lamp cap is equal to that of the main body part; the lamp holder is all metal, and an insulator is arranged at the lower part of the hollow conductive needle; the difference between the outer diameter of the end part and the outer diameter of the main body part is 1mm to 10 mm; the inner peripheral surface of the lamp tube is coated with a diffusion coating, the diffusion coating is coated on the end surface of the end part of the lamp tube, and the hot melt adhesive covers the surface of the diffusion coating on the end surface.

In the embodiment of the invention, the friction force between the diffusion coating and the hot melt adhesive is larger than the friction force between the end part of the lamp tube and the hot melt adhesive when the diffusion coating is not coated.

Both ends of the transition part in the embodiment of the invention are cambered surfaces.

In the embodiment of the invention, an arc surface is arranged between the outer surface of the transition part and the outer surface of the main body part.

The transition part of the embodiment of the invention is an inverted S-shaped curved surface formed by two arc surfaces.

The curvature radius ratio of the two cambered surfaces is 1: 1.5-1: 10.

The curvature radius ratio of the two cambered surfaces is 1: 1.25-1: 5.

The outer surface of the end part of the embodiment of the invention is a continuous surface and is parallel to the outer surface of the main body part.

The hot melt adhesive comprises welding paste powder, and the hot melt adhesive expands after being heated and solidifies after being cooled so as to fix the lamp holder on the lamp tube.

In the embodiment of the invention, an accommodating space is formed between the heat conducting part and the lamp tube, and the hot melt adhesive is filled in the accommodating space.

Compared with the prior art, the technical scheme of the invention has the following advantages:

the lamp holder is provided with the heat conducting part, so that when the lamp holder is connected with the lamp tube, the hot melt adhesive can be solidified through heat conduction, the bonding is convenient, and the efficiency is high; one end or both ends of fluorescent tube form the tip that an external diameter is less than the main part through the throat to make lamp holder outer peripheral face and main part outer peripheral face parallel and level, make packing bearing thing can contact fluorescent tube and lamp holder simultaneously, whole LED straight tube lamp atress is even, prevents to break in the transportation. In addition, the lamp cap is bonded with the lamp tube at the transition part, and the height difference is formed between the end part of the lamp tube and the main body part, so that the viscose is prevented from overflowing to the main body part, the trouble of manual modification treatment is saved, and the yield is improved; the lamp tube is internally provided with a diffusion layer, when light penetrates through the diffusion layer, the light can be diffused, and the light can be corrected into a uniform surface light source so as to achieve the effect of optical diffusion and finally enable the brightness of the lamp tube to be uniformly distributed. The diffusion layer is arranged on the inner wall of the lamp tube, so that the granular sensation of a user during observation can be reduced, and the visual comfort level is improved; the thickness of the diffusion layer can be very small, so that the light output efficiency is ensured to the maximum extent; through optimizing the design and use of the hot melt adhesive and the heating mode of the hot melt adhesive, the combination and fixation between the lamp tube and the lamp holder can be better executed, and the reduction of the reliability caused by the high temperature of the internal environment of the lamp holder in the hot melt adhesive bonding between the lamp tube and the lamp holder is avoided. In addition, the hot melt adhesive is used as an object for realizing the insulation effect between the lamp tube and the lamp holder, and the electric shock condition which possibly occurs when the lamp tube is damaged can be avoided.

Drawings

FIG. 1 is a perspective view of an LED straight tube lamp according to an embodiment of the invention;

FIG. 2 is an exploded perspective view of an LED straight tube lamp according to an embodiment of the invention;

FIG. 3 shows an external structure of a lamp cap of an LED straight lamp according to an embodiment of the invention;

FIG. 4 shows an internal structure of a lamp cap of an LED straight lamp according to an embodiment of the invention;

FIG. 5 is a partial cross-sectional view of an LED straight tube lamp in accordance with one embodiment of the present invention;

FIG. 6 is a perspective cross-sectional view of a lamp head of an LED straight lamp according to another embodiment of the invention;

FIG. 7 is a schematic view showing an LED straight lamp according to another embodiment of the present invention;

FIG. 8 is a straight LED tube lamp according to another embodiment of the present invention;

FIG. 9 is a cross-sectional view of the all plastic lamp cap of FIG. 8 taken along the direction X-X;

FIG. 10 is a schematic view of a magnetically permeable metal member having at least one void structure as viewed in a radial direction;

FIG. 11 is a schematic view of a magnetically permeable metal member having at least one indentation structure as viewed in a radial direction;

FIG. 12 is a sectional view of the lamp cap of FIG. 8, taken along the axial direction of the lamp tube, after the insulating tube and the lamp tube are combined;

fig. 13 is a sectional view in the axial direction of the lamp tube;

FIG. 14 shows a lamp cap structure in an LED straight lamp according to still another embodiment of the invention;

FIG. 15 shows an end structure of a lamp tube in an LED straight tube lamp according to various embodiments of the present invention;

FIG. 16 is a cross-sectional view showing the structure of a transition portion of the lamp tube of FIG. 15;

FIG. 17 is a sectional view of a lamp tube in an LED straight tube lamp according to an embodiment of the present invention taken along an axial direction;

figure 18 shows a cross-sectional view in the axial direction of a first variant of the LED straight lamp of figure 17;

FIG. 19 shows a cross-sectional view in the axial direction of a second modification of the LED straight lamp of FIG. 17;

figure 20 shows a cross-sectional view in the axial direction of a third variant of the LED straight lamp of figure 17;

figure 21 shows a cross-sectional view in the axial direction of a fourth variant of the LED straight tube lamp of figure 17;

fig. 22 shows a structure in which, in the LED straight lamp according to each embodiment of the present invention, the lamp panel is a flexible circuit board and climbs over the reinforcement portion to be welded to the power output end;

fig. 23 illustrates a lamp panel in a straight LED lamp according to various embodiments of the present invention, which has a layered structure of a double-layered flexible circuit board;

fig. 24 shows a three-dimensional structure of an LED straight lamp according to an embodiment of the present invention, in which a lamp panel is a flexible circuit board and is welded to a printed circuit board of a power supply;

fig. 25 shows a pad structure of a flexible circuit board of an LED straight lamp according to an embodiment of the present invention;

fig. 26 shows that the lamp panel of the LED straight lamp according to the embodiment of the invention is a flexible circuit board and has 3 pad structures with a row of parallel pads;

fig. 27 shows that the lamp panel of the LED straight lamp according to the embodiment of the invention is a flexible circuit board and has 3 pad structures with two rows of pads;

fig. 28 shows that the lamp panel of the LED straight lamp in the embodiment of the present invention is a flexible circuit board and has 4 pad structures in a row of parallel pads;

fig. 29 shows that the lamp panel of the LED straight lamp in the embodiment of the present invention is a flexible circuit board and has 4 pad structures with two rows of pads in parallel;

fig. 30 shows a pad structure in which a lamp panel of the LED straight lamp according to the embodiment of the present invention is a flexible circuit board and a pad has a hole;

FIG. 31 is an enlarged, cross-sectional, side view of the flexible circuit board of FIG. 30 soldered to a printed circuit board of a power supply;

FIG. 32 is a partial enlarged side cross-sectional view of a solder pad hole of the flexible circuit board of FIG. 30 positioned near an edge of the solder pad hole, soldered to a printed circuit board of a power supply;

fig. 33 shows a pad structure in which a lamp panel of the LED straight lamp according to the embodiment of the invention is a flexible circuit board and a pad thereof has a notch;

FIG. 34 is a side sectional, partially enlarged view taken along line A-A' of FIG. 33;

FIG. 35 is a perspective view of a bracket in a light source in an LED straight tube lamp according to an embodiment of the invention;

fig. 36 shows a power supply structure in an LED straight lamp according to an embodiment of the present invention.

Detailed Description

The inventor of the present invention proposes a new LED straight lamp based on a glass lamp tube to solve the problems mentioned in the background art and the above problems. In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

Referring to fig. 1 and 2, in various embodiments of the present invention, an LED straight tube lamp is provided, which includes: a fluorescent tube 1, a lamp plate 2 that locates in fluorescent tube 1 to and locate two lamp holders 3 at fluorescent tube 1 both ends respectively. In one embodiment, the lamp caps are the same in size, and the LED straight lamp adopts a glass lamp tube with a strengthening part, so that the problems that the traditional glass lamp tube is easy to break and break to cause electric shock accidents due to electric leakage and the plastic lamp tube is easy to age are solved.

Referring to fig. 2 and fig. 15, in an embodiment of the invention, a glass lamp tube of a straight LED tube lamp has a structurally strengthened end portion, which is described below. The lamp tube 1 comprises a main body part 102 and end parts 101 respectively positioned at two ends of the main body part 102, and the lamp cap 3 is sleeved outside the end parts 101. Wherein the outer diameter of at least one end portion 101 is smaller than the outer diameter of the body portion 102. In this embodiment, the outer diameters of the two end portions 101 are smaller than the outer diameter of the main body portion 102, and the cross section of the end portion 101 is a plane and parallel to the main body portion 102. Specifically, the two ends of the lamp tube 1 are treated by the strengthening parts, the end part 101 forms a strengthening part structure, and the lamp cap 3 is sleeved on the strengthened end part 101, so that the difference between the outer diameter of the lamp cap 3 and the outer diameter of the lamp tube main body part 102 is reduced, and even is completely flat, that is, the outer diameter of the lamp cap 3 is equal to the outer diameter of the main body part 102, and no gap is generated between the lamp cap 3 and the main body part 102. The advantage that sets up like this lies in, and in the transportation, the packing bearing thing can not only contact lamp holder 3, and it can contact lamp holder 3 and fluorescent tube 1 simultaneously for whole LED straight tube lamp atress is even, and can not make lamp holder 3 become only stress point, avoids lamp holder 3 and fluorescent tube tip 101 position of being connected because the atress concentrates and takes place to break, improves the quality of product, and has pleasing to the eye effect concurrently.

In this embodiment, the outer diameter of the base 3 is substantially equal to the outer diameter of the body 102 with a tolerance of plus or minus 0.2mm (millimeters) and not exceeding plus or minus 1mm at most.

In order to achieve the purpose that the outer diameter of the lamp cap 3 is substantially equal to the outer diameter of the main body 102, the difference between the outer diameters of the reinforced end part 101 and the main body 102 can be 1mm to 10mm according to different thicknesses of the lamp cap 3; or more preferably, the difference between the outer diameters of the reinforced end portion 101 and the main body portion 102 may be widened to 2mm to 7 mm.

In this embodiment, referring to fig. 15, the end portion 101 and the main body portion 102 of the lamp tube 1 smoothly transition to form a transition portion 103, and both ends of the transition portion 103 are arc-shaped, that is, the cross section of both ends of the transition portion 103 along the axial direction is arc-shaped. Further, an arc is between the outer surface of the transition portion 103 and the outer surface of the main body portion 102, the arc angle of the arc is greater than ninety degrees, and the outer surface of the end portion 101 is a continuous surface and remains parallel to the outer surface of the main body portion 102.

The length of the transition part 103 is 1mm to 4mm, and if less than 1mm, the strength of the transition part is insufficient; if it is larger than 4mm, the length of the body portion 102 is reduced, the light emitting surface is reduced, and the length of the base 3 is required to be increased to fit the body portion 102, resulting in an increase in the material of the base 3. In other embodiments, the transition portion 103 may not be curved. Referring to fig. 5 and 16, fig. 5 shows a schematic structural diagram of the connection between the lamp cap 3 and the lamp tube 1 according to the embodiment of the present invention, and fig. 16 shows a schematic structural diagram of the transition portion 103 of the lamp tube 1 in fig. 5. As shown in fig. 5 and 16, in the present embodiment, the lamp tube 1 is a glass lamp tube, the transition portion 103 between the main body portion 102 and the end portion 101 is a slightly inverted S-shaped curved surface formed by two continuous curved surfaces with curvature radii R1 and R2, generally speaking, the relationship between the curvature radii R1 and R2 of the two curved surfaces is R1< R2, the ratio range of R1 and R2 is R1: R2 is 1:1.5 to 1:10, preferably 1:2.5 to 1:5, and most preferably 1:3 to 1:4, and in the present embodiment, R1: R2 is about 1:3, so that the transition portion 103 near the end portion 101 (i.e., the transition portion 103 with the curved surface being concave upwards as shown in fig. 16) is strengthened to make the glass in a state of inner layer being pulled and outer layer being pressed, thereby achieving the purpose of increasing the strength of the transition portion 103 of the glass lamp tube 1. The transition portion 103 (i.e. the transition portion 103 with the downward concave cambered surface shown in fig. 16) close to the main body portion 102 is strengthened, so that the glass is in a state that the inner layer is compressed and the outer layer is pulled, thereby achieving the purpose of increasing the strength of the transition portion 103 of the glass lamp tube 1.

Taking the standard lamp tube of T8 as an example, the outer diameter of the reinforced end portion 101 ranges from 20.9mm to 23mm, and if it is less than 20.9mm, the inner diameter of the end portion 101 is too small, so that the power supply part cannot be inserted into the lamp tube 1. The outer diameter of the main body 102 is 25mm to 28mm, and if the outer diameter is smaller than 25mm, the two ends of the main body are not convenient to be treated by strengthening parts under the existing process conditions, and if the outer diameter is larger than 28mm, the main body does not meet the industrial standard.

Referring to fig. 3 and 4, in an embodiment of the invention, the lamp head 3 of the LED straight tube lamp includes an insulating tube 302, a heat conducting portion 303 fixed on an outer circumferential surface of the insulating tube 302, and two hollow conductive pins 301 disposed on the insulating tube 302.

Referring to fig. 5, in the present embodiment, one end of the heat conducting portion 303 extends out of one end of the insulating tube 302 facing the lamp tube, and the extending portion (the portion extending out of the insulating tube) of the heat conducting portion 303 and the lamp tube 1 are bonded by a hot melt adhesive 6. Further, the lamp cap 3 extends to the transition portion 103 through the heat conduction portion 303, and the heat conduction portion 303 is in close contact with the transition portion 103, so that when the heat conduction portion 303 and the lamp tube 1 are adhered by the hot melt adhesive 6, the hot melt adhesive 6 does not overflow the lamp cap 3 and remain on the main body portion 102 of the lamp tube 1. Furthermore, the end of the insulating tube 302 facing the lamp tube 1 does not extend to the transition portion 103, i.e. a certain distance is maintained between the end of the insulating tube 302 facing the lamp tube and the transition portion 103. In this embodiment, the material of the insulating tube 302 is not limited to plastic, ceramic, or the like, and may be a good conductor that is not electrically conductive in a general state. Furthermore, the hot melt adhesive 6 is a composition comprising a material of solder paste powder, preferably having the following composition: phenolic resin 2127#, shellac, rosin, calcite powder, zinc oxide, ethanol, and the like. In this embodiment, rosin is a tackifier, and has the property of being soluble in ethanol but insoluble in water. The hot melt adhesive 6 can change the physical state of the hot melt adhesive to greatly expand under the condition of high-temperature heating, achieves the curing effect, and additionally has the viscosity of the material, so that the lamp holder 3 can be in close contact with the lamp tube 1, and the LED straight tube lamp can be conveniently and automatically produced. In the present embodiment, the hot melt adhesive 6 will expand and flow after being heated at a high temperature, and then will solidify after being cooled, and when the hot melt adhesive 6 is heated from room temperature to a temperature of 200 to 250 ℃, the volume of the hot melt adhesive will expand to 1 to 1.3 times of the original volume. Of course, the selection of the hot melt adhesive composition of the present invention is not limited thereto, and the composition can be selected to be cured after being heated to a predetermined temperature. The hot melt adhesive 6 of the invention can not cause reliability reduction due to high temperature environment formed by heating of heating components such as power supply components, etc., can prevent the bonding performance of the lamp tube 1 and the lamp cap 3 from being reduced in the use process of the LED straight tube lamp, and can improve long-term reliability.

Specifically, an accommodating space is formed between the inner peripheral surface of the protruding portion of the heat conducting portion 303 and the outer peripheral surface of the lamp tube 1, and the hot melt adhesive 6 is filled in the accommodating space (a position indicated by a dotted line B in fig. 5). In other words, the location where the hot melt adhesive 6 is filled passes through a first virtual plane (a plane as drawn by the dotted line B in fig. 5) perpendicular to the axial direction of the lamp tube 1: in the radially inward direction, at the position of the first virtual plane, the heat conduction portion 303, the hot melt adhesive 6, and the outer peripheral surface of the lamp tube 1 are arranged in this order. The hot melt adhesive 6 may be applied to a thickness of 0.2mm to 0.5mm, and the hot melt adhesive 6 is cured after being expanded, thereby contacting the lamp tube 1 and fixing the lamp cap 3 to the lamp tube 1. And because the height difference exists between the outer peripheral surfaces of the end part 101 and the main body part 102, the hot melt adhesive can be prevented from overflowing to the main body part 102 of the lamp tube, the subsequent manual wiping process is omitted, and the yield of the LED straight tube lamp is improved.

During processing, heat is conducted to the heat conducting part 303 through external heating equipment, then conducted to the hot melt adhesive 6, and the hot melt adhesive 6 is cooled and solidified after expansion, so that the lamp holder 3 is fixedly bonded on the lamp tube 1.

In this embodiment, as shown in fig. 5, the insulating tube 302 includes a first tube 302a and a second tube 302b connected in an axial direction, the outer diameter of the second tube 302b is smaller than the outer diameter of the first tube 302a, and the difference between the outer diameters of the two tubes ranges from 0.15mm to 0.3 mm. The heat conducting part 303 is arranged on the outer peripheral surface of the second tube 302b, and the outer surface of the heat conducting part 303 is flush with the outer peripheral surface of the first tube 302a, so that the outer surface of the lamp holder 3 is flat and smooth, and the stress of the whole LED straight tube lamp in the packaging and transportation processes is uniform. The ratio of the length of the heat conducting part 303 in the axial direction of the lamp holder to the axial length of the insulating tube 302 is 1:2.5 to 1:5, namely the length of the heat conducting part: the length of the insulating tube is 1: 2.5-1: 5.

In this embodiment, in order to ensure the bonding firmness, the second tube 302b is at least partially sleeved outside the lamp tube 1, and the accommodating space further includes a space between the inner surface of the second tube 302b and the outer surface of the end portion 101 of the lamp tube. The hot melt adhesive 6 is partially filled between the second tube 302b and the lamp vessel 1, which are overlapped with each other (at the position indicated by the broken line a in fig. 5), i.e., a portion of the hot melt adhesive 6 is located between the inner surface of the second tube 302b and the outer surface of the end portion 101. In other words, the position where the hot melt adhesive 6 is filled in the accommodating space passes through a second virtual plane (a plane drawn by a dotted line a in fig. 5) perpendicular to the axial direction of the lamp tube: in the radially inward direction, at the position of the second virtual plane, the heat conduction portion 303, the second tube 302b, the hot melt adhesive 6, and the end portion 101 are arranged in this order. It should be noted that, in the present embodiment, the hot melt adhesive 6 does not need to completely fill the accommodating space (e.g., the accommodating space may also include a space between the heat conducting portion 303 and the second tube 302 b). When the hot melt adhesive 6 is applied between the heat conduction portion 303 and the end portion 101 at the time of manufacture, the amount of the hot melt adhesive can be increased as appropriate so that the hot melt adhesive can flow between the second pipe 302b and the end portion 101 due to expansion during the subsequent heating, and then be bonded after being cooled and solidified.

After the end portion 101 of the lamp tube 1 is inserted into the lamp cap 3, the axial length of the portion, inserted into the lamp cap 3, of the end portion 101 of the lamp tube 1 accounts for one third to two thirds of the axial length of the heat conducting portion 303, which is beneficial to: on one hand, the hollow conductive needle 301 and the heat conducting part 303 are ensured to have enough creepage distance, and the hollow conductive needle and the heat conducting part are not easy to be short-circuited when being electrified, so that people are electric shock and danger is caused; on the other hand, due to the insulating effect of the insulating tube 302, the creepage distance between the hollow conductive needle 301 and the heat conducting part 303 is increased, and the test which causes danger due to electric shock when high voltage passes is easier to pass.

Further, with respect to the hot melt adhesive 6 on the inner surface of the second pipe 302b, the second pipe 302b is interposed between the hot melt adhesive 6 and the heat conductive portion 303, and therefore the effect of heat conduction from the heat conductive portion 303 to the hot melt adhesive 6 is impaired. Therefore, referring to fig. 4, in the present embodiment, a plurality of circumferentially arranged notches 302c are disposed at an end of the second tube 302b facing the lamp tube 1 (i.e., an end away from the first tube 302 a), so as to increase a contact area between the heat conducting portion 303 and the hot melt adhesive 6, thereby facilitating heat to be rapidly conducted from the heat conducting portion 303 to the hot melt adhesive 6, and accelerating a curing process of the hot melt adhesive 6. Meanwhile, when the user touches the heat conduction part 303, the lamp tube 1 is not damaged to cause electric shock due to the insulation effect of the hot melt adhesive 6 between the heat conduction part 303 and the lamp tube 1.

The heat conducting portion 303 may be made of various materials that easily conduct heat, such as a metal sheet in this embodiment, and has a good appearance, such as an aluminum alloy. The heat conducting portion 303 is tubular (or ring-shaped) and is sleeved outside the second tube 302 b. The insulating tube 302 may be made of various insulating materials, but it is preferable that the insulating tube 302 is made of a plastic tube, so as to prevent heat from being conducted to the power supply components inside the lamp head 3 and affecting the performance of the power supply components.

The lamp cap of the LED straight tube lamp of the present invention may be provided in other forms or contain other components in other embodiments, as described below.

Referring to fig. 6, in another embodiment of the present invention, the lamp cap 3 further includes a magnetic conductive metal member 9 besides the insulating tube 302, but does not include the aforementioned heat conducting portion. The magnetic conductive metal member 9 is fixedly disposed on the inner circumferential surface of the insulating tube 302, and at least a portion of the magnetic conductive metal member is located between the inner circumferential surface of the insulating tube 302 and the end portion of the lamp tube, and has an overlapping portion with the lamp tube 1 along the radial direction.

In this embodiment, the entire magnetic conductive metal member 9 is located in the insulating tube 302, and the hot melt adhesive 6 is coated on the inner surface of the magnetic conductive metal member 9 (the surface of the magnetic conductive metal member 9 facing the lamp tube 1) and is adhered to the outer circumferential surface of the lamp tube 1. In order to increase the bonding area and improve the bonding stability, the hot melt adhesive 6 preferably covers the entire inner surface of the magnetically permeable metal member 9.

Referring to fig. 7, in the manufacture of the LED straight tube lamp of the present embodiment, the insulating tube 302 of the lamp cap 3 is inserted into an external heating device, which is preferably an induction coil 11, such that the induction coil 11 is located above the magnetic metal member 9 and is opposite to the magnetic metal member 9 along the radial direction of the insulating tube 302. When processing, with induction coil 11 circular telegram, induction coil 11 forms the electromagnetic field after circular telegram, and the electromagnetic field converts the electric current into behind magnetic conduction metalwork 9 for magnetic conduction metalwork 9 generates heat, uses electromagnetic induction technique to make magnetic conduction metalwork 9 generate heat promptly, and heat conduction to hot melt adhesive 6, and hot melt adhesive 6 absorbs the heat back inflation and flows, makes hot melt adhesive 6 solidification after the cooling, in order to realize being fixed in the purpose of fluorescent tube 1 with lamp holder 3. In this embodiment, the induction coil 11 is a ring coil formed by rolling a metal wire made of red copper and having a width of 5mm to 6mm, the diameter of the ring coil is about 30mm to 35mm, and the lower limit of the diameter of the ring coil is slightly larger than the outer diameter of the lamp cap 3.

Further, the induction coil 11 is supplied with an alternating current with an electric power of 15kW to 25kW and a frequency of 25kHz to 35 kHz. Preferably, the electric power is 20kW and the frequency is 30 kHz. Furthermore, the induction coil 11 can be used with a power amplification unit to amplify the power of the ac power store by 1 to 2 times. The current obtained by the induction coil 11 is 25A to 35A, preferably 32.5A, and the continuous energization time of the induction coil 11 is 2 seconds to 10 seconds, preferably 5 seconds. The induction coil 11 is coaxial with the insulating tube 302 as much as possible, so that the energy transfer is uniform. In this embodiment, the deviation between the induction coil 11 and the central axis of the insulating tube 302 is not more than 0.05 mm. After the bonding is completed, the lamp tube 1 together with the lamp cap 3 is drawn out of the induction coil 11. In this embodiment, the hot melt adhesive 6 will expand and flow after absorbing heat, and then will solidify after cooling. In this embodiment, the heating temperature of the magnetic metal piece 9 can reach 250 to 300 degrees celsius, and the heating temperature of the hot melt adhesive 6 can reach 200 to 250 degrees celsius.

In this embodiment, after the manufacturing process of the lamp tube 1 is completed, the induction coil 11 is not moved, and then the lamp tube 1 and the lamp cap 3 are pulled away from the induction coil 11. However, in other embodiments, the induction coil 11 may be detached from the lamp tube after the lamp tube 1 is fixed. In this embodiment, the heating device of the magnetic conductive metal member 9 may adopt a device having a plurality of induction coils 11, that is, when the lamp caps 3 of the plurality of lamp tubes 1 are to be heated, only the plurality of lamp tubes 1 need to be placed at the default position, then the heating device moves the corresponding induction coil 11 to the lamp cap position of the lamp tube 1 to be heated, and after the heating is completed, the plurality of induction coils 11 are pulled away from the corresponding lamp tube 1 to complete the heating of the magnetic conductive metal member 9. However, in these embodiments, the relative movement between the induction coil 11 and the base 3 is a relative movement in the front-rear direction, regardless of whether the induction coil 11 is placed in a fixed position and the base 3 is moved and inserted into the induction coil 11, or the base 3 is placed in a fixed position and the induction coil 11 is moved and the base 3 is inserted into the induction coil 11. Since the length of the lamp tube 1 is much longer than that of the lamp cap 3, or even the length of the lamp tube 1 can reach over 240cm in some special applications, when the lamp tube 1 and the lamp cap 3 are interlocked, the connection and fixation between the lamp cap 3 and the lamp tube 1 may be damaged due to the position error when the induction coil 11 and the lamp cap 3 are drawn in or out relative to each other.

Referring to fig. 6, in order to better support the magnetic metal member 9, the inner diameter of the portion 302d of the inner circumferential surface of the insulating tube 302 for supporting the magnetic metal member 9 is larger than the inner diameter of the remaining portion 302e, a step is formed at the intersection of 302d and 302e, one axial end of the magnetic metal member 9 abuts against the step, and after the magnetic metal member 9 is disposed, the inner surface of the entire lamp holder is flush. The magnetic conductive metal fitting 9 may have various shapes, for example, a sheet shape or a tubular shape arranged in the circumferential direction, and here, the magnetic conductive metal fitting 9 is provided in a tubular shape coaxial with the insulating tube 302.

Referring to fig. 8 and 9, in another embodiment, the inner circumferential surface of the insulating tube 302 may support the magnetic conductive metal fitting 9 as follows: the inner peripheral surface of the insulating tube 302 has a support part 313 protruding toward the inside of the insulating tube 302, and a protrusion 310 is further provided on the inner peripheral surface of the insulating tube 302 on a side of the support part 313 facing the lamp tube main body part, and a radial thickness of the protrusion 310 is smaller than that of the support part 313. As shown in fig. 9, the protruding portion 310 is connected to the support portion 313 in the axial direction, and the magnetic conductive metal member 9 abuts against the upper edge of the support portion 313 (i.e., the end surface of the support portion on the side facing the protruding portion) in the axial direction and abuts against the radially inner side of the protruding portion 310 in the circumferential direction. That is, at least a part of the projection 310 is located between the magnetic conductive metal member 9 and the inner peripheral surface of the insulating tube 302.

In other embodiments, the lamp cap 3 may be made of all metal, and an insulator needs to be added below the hollow conductive pin to withstand high voltage.

Referring to fig. 10, in other embodiments, the surface of the magnetic metal piece 9 facing the insulating tube 302 has at least one hole structure 91, and the shape of the hole structure 91 is circular, but not limited to circular, and may be, for example, oval, square, star-shaped, etc., as long as the contact area between the magnetic metal piece 9 and the inner circumferential surface of the insulating tube 302 can be reduced, and the function of heat curing, i.e., heating the hot melt adhesive 6 can be achieved. Preferably, the area of the hole structure 91 accounts for 10% to 50% of the area of the magnetic conductive metal member 9. The arrangement of the hole structures 91 may be equally spaced in the circumferential direction or unequally spaced.

Referring to fig. 11, in another embodiment, the surface of the magnetic metal member 9 facing the insulating tube 302 has an indentation structure 93, and the indentation structure 93 may be a structure protruding from the inner surface of the magnetic metal member 9 to the outer surface, but may also be a structure protruding from the outer surface of the magnetic metal member 9 to the inner surface, in order to form a protrusion or a depression on the outer surface of the magnetic metal member 9, so as to achieve the purpose of reducing the contact area between the outer surface of the magnetic metal member 9 and the inner circumferential surface of the insulating tube 302. That is, the surface shape of the magnetic metal member 9 can be selected from one structural shape of the group consisting of a hole structure, a relief structure and a recess structure, so as to achieve the purpose of reducing the contact area between the outer surface of the magnetic metal member 9 and the inner circumferential surface of the insulating tube 302. It should be noted, however, that the magnetically conductive metal piece 9 and the lamp tube should be ensured to be stably bonded to each other at the same time, so as to realize the function of the thermosetting hot melt adhesive 6.

Referring to fig. 12, in the present embodiment, the magnetic metal member 9 is a circular ring. Referring to fig. 13, in other embodiments, the magnetically permeable metal member 9 is a non-circular ring, such as but not limited to an elliptical ring, and when the lamp tube 1 and the lamp cap 3 are elliptical, the minor axis of the elliptical ring is slightly larger than the outer diameter of the end of the lamp tube, so as to reduce the contact area between the outer surface of the magnetically permeable metal member 9 and the inner circumferential surface of the insulating tube 302, but to achieve the function of thermally curing the hot melt adhesive 6. In other words, since the insulating tube 302 has the support portion 313 on the inner peripheral surface thereof and the non-circular ring-shaped magnetic metal fitting 9 is provided on the support portion 313, the contact area between the magnetic metal fitting 9 and the inner peripheral surface of the insulating tube 302 can be reduced, and the function of solidifying the hot melt adhesive 6 can be realized. It should be noted that, in other embodiments, the magnetic conductive metal member 9 may be disposed outside the lamp cap 3, instead of the heat conducting portion 303 shown in fig. 5, and the function of curing the hot melt adhesive 6 may also be realized by the electromagnetic induction principle.

In order to facilitate the connection and fixation of the lamp cap 3 and the lamp tube 1, the present embodiment is modified with respect to the lamp cap 3.

Referring to fig. 3-5 in combination with fig. 6-9, when the lamp cap 3 is sleeved outside the lamp tube 1, the lamp cap 3 is sleeved outside the end portion 101 of the lamp tube 1 and extends to the transition portion 103 to overlap with the transition portion 103. In the present embodiment, the lamp cap 3 includes two hollow conductive pins 301.

Referring to fig. 14, in another embodiment, a convex pillar 312 is disposed at an end of the lamp cap 3', a hole is disposed at a top end of the convex pillar 312, and a groove 313 with a depth of 0.1mm is disposed at an outer edge of the convex pillar for positioning the conductive pin. The conductive pin can be bent over the groove 313 after passing through the hole of the protruding pillar 312 at the end of the lamp cap 3', and then the protruding pillar 312 is covered by a conductive metal cap 311, so that the conductive pin can be fixed between the protruding pillar 312 and the conductive metal cap 311, in this embodiment, the inner diameter of the conductive metal cap 311 is, for example, 7.56mm, the outer diameter of the protruding pillar 312 is, for example, 7.23mm, and the outer diameter of the conductive pin is, for example, 0.5mm, so that the conductive metal cap 311 can directly and tightly cover the protruding pillar 312 without additionally coating adhesive, thereby completing the electrical connection between the power supply 5 and the conductive metal cap 311.

Referring to fig. 2, 3, 12 and 13, in other embodiments, the lamp cap provided by the present invention is provided with a hole 304 for heat dissipation. Therefore, heat generated by the power supply assembly inside the lamp cap can be dissipated without causing the inside of the lamp cap to be in a high-temperature state, so that the reliability of elements inside the lamp cap is prevented from being reduced.

Referring to fig. 17, the lamp tube 1 of the present embodiment includes a diffusion layer 13 besides being closely attached to the lamp panel 2 (or the flexible circuit board) of the lamp tube 1, and light generated by the light source 202 passes through the diffusion layer 13 and then passes through the lamp tube 1.

The diffusion layer 13 diffuses the light emitted from the light source 202, so that the diffusion layer 13 can be disposed in various ways, for example, as long as the light can pass through the diffusion layer 13 and then out of the lamp tube 1: the diffusion layer 13 may be coated or covered on the inner circumference of the lamp tube 1, or a diffusion coating (not shown) coated or covered on the surface of the light source 202, or a diffusion film covering (or covering) the light source 202 as an outer cover.

Referring to fig. 17 again, when the diffusion layer 13 is a diffusion film, it can cover the light source 202 without contacting the light source 202.

When the diffusion layer 13 is a diffusion coating, the main component thereof may be any one of calcium carbonate, calcium halophosphate, and alumina, or a combination of any two thereof, or a combination of three thereof. When calcium carbonate is used as a main material and a proper solution is matched to form a diffusion coating, the diffusion coating has excellent diffusion and light transmission effects (the organic rate can reach more than 90 percent). It has also been found that the lamp cap with the strengthened glass portion sometimes has quality problems, and some proportion of the lamp cap may easily fall off, and if the diffusion coating is also coated on the outer surface of the end portion 101 of the lamp tube, the friction between the lamp cap and the lamp tube will be increased between the diffusion coating and the hot melt adhesive 6, so that the friction between the diffusion coating and the hot melt adhesive 6 is larger than the friction between the end surface of the end portion 101 of the lamp tube and the hot melt adhesive when the diffusion coating is not coated, and therefore the problem that the lamp cap 3 falls off can be solved greatly by the friction between the diffusion coating and the hot melt adhesive 6.

In this example, the diffusion coating was formulated to include calcium carbonate, strontium phosphate (e.g., CMS-5000, white powder), a thickener, and ceramic activated carbon (e.g., ceramic activated carbon SW-C, colorless liquid).

Specifically, when the diffusion coating uses calcium carbonate as a main material, and is matched with a thickening agent, ceramic activated carbon and deionized water, the mixture is coated on the inner circumferential surface of the glass lamp tube, the average coating thickness is between 20 and 30 micrometers, and finally the deionized water is volatilized, and only three substances of the calcium carbonate, the thickening agent and the ceramic activated carbon are left. The diffusion layer 13 formed using such a material may have a light transmittance of about 90%, and in general, the light transmittance ranges from about 85% to 96%. In addition, the diffusion layer 13 can play a role of electric isolation besides having the effect of diffusing light, so that when the glass lamp tube is broken, the risk of electric shock of a user is reduced; meanwhile, the diffusion layer 13 can diffuse light emitted from all sides when the light source 202 emits light, so that the light can shine behind the light source 202, namely, be close to one side of the flexible circuit board, thereby avoiding a dark area from being formed in the lamp tube 1 and improving the illumination comfort of the space. Furthermore, when a diffusion coating of different material composition is selected, there is another possible embodiment that a diffusion layer with a thickness ranging from 200 μm to 300 μm and a light transmittance controlled between 92% and 94% can be used, which has another effect.

In other embodiments, the diffusion coating may also be made of calcium carbonate as a main material, and a small amount of reflective material (such as strontium phosphate or barium sulfate), a thickening agent, ceramic activated carbon, and deionized water are mixed and coated on the inner circumferential surface of the glass lamp tube, the average coating thickness falls between 20 μm and 30 μm, and finally the deionized water is volatilized to leave only the calcium carbonate, the reflective material, the thickening agent, and the ceramic activated carbon. Since the diffusion layer is designed to diffuse light, the diffusion phenomenon is microscopically the reflection of light by particles, and the particle size of the reflective material such as strontium phosphate or barium sulfate is much larger than that of calcium carbonate, a small amount of reflective material is added into the diffusion coating to effectively increase the light diffusion effect. Of course, in other embodiments, calcium halophosphate or alumina may be used as the main material of the diffusion coating, the particle size of calcium carbonate is between about 2 and 4 μm, and the particle size of calcium halophosphate and alumina is between about 4 and 6 μm and 1 and 2 μm, respectively, in the case of calcium carbonate, when the light transmittance requirement range is 85% to 92%, the average thickness of the calcium halophosphate-based diffusion coating is about 20 to 30 μm, and in the same light transmittance requirement range (85% to 92%), the average thickness of the calcium halophosphate-based diffusion coating is about 25 to 35 μm, and the average thickness of the alumina-based diffusion coating is about 10 to 15 μm. If the light transmittance is required to be higher, for example, more than 92%, the thickness of the diffusion coating using calcium carbonate, calcium halophosphate or alumina as the main material is required to be thinner, and the average thickness of the diffusion coating using calcium carbonate as the main material is between 10 and 15 μm.

That is, the main material to be coated with the diffusion coating, the corresponding forming thickness, etc. can be selected according to the application of the lamp tube 1 and different light transmittance requirements. It should be noted that, the higher the light transmittance of the diffusion layer is, the more the user sees the graininess of the light source. In this embodiment, the diffusion coating is formed mainly in two ways, i.e., a press-coating method, in which after the entire lamp tube is erected, pressure is applied in a diffusion coating device by using pressure to fill the entire lamp tube with a diffusion coating solution, and then the pressure is removed, so that the viscosity of the diffusion coating material such as calcium carbonate attached to the inner circumferential surface of the lamp tube can be increased due to the thickening agent contained in the diffusion coating solution, and after the diffusion coating solution flows back to the diffusion coating device, the diffusion coating is uniformly formed on the inner circumferential surface of the lamp tube by using an air-drying method; the second step is to erect the whole lamp tube, spray the inner circumference of the whole lamp tube with the diffusion coating solution by using the diffusion solution spraying equipment, increase the uniformity of the diffusion coating solution when the diffusion coating solution is adhered to the inner circumference of the lamp tube by means of inclined arrangement or rotating the lamp tube, and finally form the diffusion coating on the inner circumference of the lamp tube uniformly by using the air drying method.

With reference to fig. 17, a reflective film 12 is further disposed on the inner circumferential surface of the lamp tube 1, and the reflective film 12 is disposed around the lamp panel 2 having the light source 202 and occupies a part of the inner circumferential surface of the lamp tube 1 along the circumferential direction. As shown in fig. 17, the reflective film 12 extends along the circumferential direction of the lamp tube on both sides of the lamp panel 2, and the lamp panel 2 is substantially located at the middle position of the reflective film 12 along the circumferential direction. The provision of the reflective film 12 has two effects, on one hand, when the lamp 1 is viewed from the side (X direction in the figure), the light source 202 is not directly seen due to the blocking of the reflective film 12, thereby reducing the visual discomfort caused by the granular feeling; on the other hand, the light emitted by the light source 202 is reflected by the reflective film 12, so that the divergence angle of the lamp tube can be controlled, and the light is more irradiated towards the direction not coated with the reflective film, so that the LED straight tube lamp can obtain the same irradiation effect with lower power, and the energy saving performance is improved.

The reflective films 12 and the diffusion layers 13 can be combined to achieve the optical effects of reflection, diffusion, or both. For example, only the reflective film 12 may be provided, and the diffusion layer 13 may not be provided, as shown in fig. 19, 20, and 21.

In other embodiments, the glass tube may be coated with a diffusion coating on its entire inner circumference or partially coated with a diffusion coating (not coated where the reflective film 12 is present), but in either case, the diffusion coating is preferably applied to the outer surface of the end portion of the lamp vessel 1 to make the adhesion between the base 3 and the lamp vessel 1 stronger.

It should be noted that, in the above embodiments of the present invention, one of the group consisting of the diffusion coating, the diffusion film, the reflective film and the adhesive film may be selected and applied to the optical processing of the light emitted from the light source of the present invention.

Referring to fig. 2, in an embodiment of the present invention, the LED straight lamp further includes an adhesive sheet 4, a lamp panel insulating film 7, and a light source film 8. The lamp panel 2 is adhered to the inner circumferential surface of the lamp tube 1 by an adhesive sheet 4. The adhesive sheet 4 may be a silicone rubber, which is not limited in form, and may be several pieces as shown in the figure, or may be a long piece. The adhesive sheet 4, the lamp panel insulating film 7 and the light source film 8 may be combined with each other to form different embodiments of the present invention.

The lamp panel insulating film 7 is coated on the surface of the lamp panel 2 facing the light source 202, so that the lamp panel 2 is not exposed, and the lamp panel 2 is isolated from the outside. When gluing, a through hole 71 corresponding to the light source 202 is reserved, and the light source 202 is arranged in the through hole 71. The lamp panel insulating film 7 comprises vinyl polysiloxane, hydrogen polysiloxane and aluminum oxide. The thickness of the lamp panel insulating film 7 ranges from 100 micrometers to 140 micrometers (micrometers). If it is less than 100 μm, it does not function as a sufficient insulation, and if it is more than 140 μm, it causes a waste of materials.

The light source film 8 is coated on the surface of the light source 202. The light source film 8 is transparent to ensure light transmittance. The light source film 8 may be in the form of a granule, a strip, or a sheet after being applied to the surface of the light source 202. The parameters of the light source film 8 include refractive index, thickness, and the like. The allowable range of the refractive index of the light source film 8 is 1.22-1.6, and if the refractive index of the light source film 8 is the root of the shell refractive index of the light source 202, or the refractive index of the light source film 8 is plus or minus 15% of the root of the shell refractive index of the light source 202, the light transmittance is better. The light source housing herein refers to a housing that houses an LED die (or chip). In the present embodiment, the refractive index of the light source film 8 ranges from 1.225 to 1.253. The allowable thickness range of the light source film 8 is 1.1mm to 1.3mm, if the allowable thickness is less than 1.1mm, the light source 202 can not be covered, the effect is not good, and if the allowable thickness is more than 1.3mm, the light transmittance can be reduced, and the material cost can be increased.

During assembly, the light source film 8 is coated on the surface of the light source 202; then coating the lamp panel insulating rubber sheet 7 on the surface of one side of the lamp panel 2; then the light source 202 is fixed on the lamp panel 2; then, the surface of one side of the lamp panel 2 opposite to the light source 202 is adhered and fixed on the inner circumferential surface of the lamp tube 1 through an adhesive sheet 4; finally, the lamp cap 3 is fixed to the end of the lamp tube 1, and the light source 202 is electrically connected to the power supply 5. Or as shown in fig. 22, the flexible circuit board 2 is used to climb over the transition portion 103 and the power supply 5 for soldering (i.e. pass through the transition portion 103 and be soldered with the power supply 5), or the lamp panel 2 is electrically connected with the power supply 5 by adopting a conventional wire bonding method, and finally the lamp cap 3 is connected to the transition portion 103 after the strengthening treatment by using the method shown in fig. 5 (using the structure shown in fig. 3-4) or fig. 7 (using the structure shown in fig. 6), so as to form a complete LED straight-tube lamp.

In this embodiment, the lamp panel 2 is fixed at the inner peripheral surface of the lamp tube 1 through the adhesive sheet 4, so that the lamp panel 2 is attached to the inner peripheral surface of the lamp tube 1, thereby increasing the light emitting angle of the whole LED straight lamp, enlarging the visible angle, and generally enabling the visible angle to exceed 330 degrees by setting like this. Through scribbling lamp plate insulating film 7 at lamp plate 2, scribble insulating light source film 8 on light source 202, realize the insulation treatment to whole lamp plate 2, like this, even fluorescent tube 1 breaks, can not take place the electric shock accident yet, improves the security.

Further, the lamp panel 2 may be any one of a strip-shaped aluminum substrate, an FR4 board, or a flexible circuit board. Since the lamp tube 1 of the present embodiment is a glass lamp tube, if the lamp panel 2 is made of a rigid strip-shaped aluminum substrate or FR4 board, when the lamp tube is broken, for example, cut into two sections, the whole lamp tube can still be kept in a straight tube state, and at this time, a user may think that the LED straight tube lamp can also be used and installed by himself, which is likely to cause an electric shock accident. Because the flexible circuit board has the characteristics of strong flexibility and easy bending, and the problem that the flexibility and the bending property of the rigid strip-shaped aluminum substrate and the FR4 board are insufficient is solved, the lamp panel 2 of the embodiment adopts the flexible circuit board, so that after the lamp tube 1 is broken, the broken lamp tube 1 cannot be supported to continue to be kept in a straight tube state, so as to inform a user that the LED straight tube lamp cannot be used, and avoid the occurrence of electric shock accidents. Therefore, when the flexible circuit board is adopted, the problem of electric shock caused by the broken glass tube can be relieved to a certain extent. The following embodiments are described with the flexible circuit board as the lamp panel 2.

Referring to fig. 23, the flexible circuit board as the lamp panel 2 includes a circuit layer 2a with a conductive effect, and the light source 202 is disposed on the circuit layer 2a and electrically connected to the power supply through the circuit layer 2 a. Referring to fig. 23, in the present embodiment, the flexible circuit board may further include a dielectric layer 2b stacked on the circuit layer 2a, the areas of the dielectric layer 2b and the circuit layer 2a are equal, the circuit layer 2a is disposed on a surface opposite to the dielectric layer 2b for disposing the light source 202, and the dielectric layer 2b is adhered to the inner circumferential surface of the lamp tube 1 through the adhesive sheet 4 on the surface opposite to the circuit layer 2 a. The wiring layer 2a may be a metal layer or a power layer with wires (e.g., copper wires) disposed thereon.

Certainly, the flexible circuit board of the present invention is not limited to one or two layers of circuit boards, and in other embodiments, the flexible circuit board includes a plurality of circuit layers 2a and a plurality of dielectric layers 2b, the dielectric layers 2b and the circuit layers 2a are sequentially stacked in a staggered manner and are disposed on a side of the circuit layer 2a opposite to the light source 202, and the light source 202 is disposed on the uppermost layer of the plurality of circuit layers 2a and is electrically connected to the power source through the uppermost layer of the circuit layer 2 a. In other embodiments, the length of the flexible circuit board as the lamp panel 2 is greater than the length of the lamp tube.

Referring to fig. 2, the lamp panel 2 is provided with a plurality of light sources 202, the lamp head 3 is provided with a power supply 5 therein, and the light sources 202 and the power supply 5 are electrically connected through the lamp panel 2. In the embodiments of the present invention, the power supply 5 may be a single body (i.e. all power supply components are integrated in one component), and is disposed in the lamp head 3 at one end of the lamp tube 1; alternatively, the power supply 5 may be divided into two parts, called dual bodies (i.e. all power supply components are arranged in two parts), and the two parts are arranged in the lamp bases 3 at both ends of the lamp tube. If only one end of the lamp tube 1 is treated as the strengthening part, the power supply is preferably selected as a single body and is arranged in the lamp holder 3 corresponding to the strengthened end part 101.

The power supply can be formed in multiple ways regardless of a single body or a double body, for example, the power supply can be a module after encapsulation molding, specifically, a high-thermal-conductivity silica gel (the thermal conductivity coefficient is more than or equal to 0.7 w/m.k) is used, and the power supply component is encapsulated and molded through a mold to obtain the power supply. Or, the power supply can be formed without pouring sealant, and the exposed power supply assembly is directly placed in the lamp holder, or the exposed power supply assembly is wrapped by a traditional heat-shrinkable tube and then placed in the lamp holder 3.

In other words, in the embodiments of the present invention, the power supply 5 may be in the form of a single printed circuit board mounted power supply module as shown in fig. 23, or may be in the form of a single module as shown in fig. 36.

Referring to fig. 2 in combination with fig. 36, in an embodiment, one end of the power supply 5 has a male plug 51, the other end has a metal pin 52, the end of the lamp panel 2 has a female plug 201, and the lamp cap 3 has a hollow conductive pin 301 for connecting an external power supply. The male plug 51 of the power supply 5 is inserted into the female plug 201 of the lamp panel 2, and the metal pin 52 is inserted into the hollow conductive pin 301 of the lamp holder 3. At this time, the male plug 51 and the female plug 201 are equivalent to an adapter and used for electrically connecting the power supply 5 and the lamp panel 2. After the metal pin 52 is inserted into the hollow conductive pin 301, the hollow conductive pin 301 is impacted by an external punching tool, so that the hollow conductive pin 301 is slightly deformed, the metal pin 52 on the power supply 5 is fixed, and the electrical connection is realized.

In this embodiment, the input terminal of the power supply 5 has a metal pin 52 connected to the lamp head, and the output terminal of the other side can be provided with a male pin, an electrical metal connection hole or a bonding pad according to the connection mode with the lamp panel 2. The separated lamp panel 2 and the output end of the power supply 5 can be connected with the female plug 201 through the male plug 51, or connected through a wire in a routing manner, and the outer layer of the wire can be wrapped by an insulating sleeve to be electrically insulated and protected. In addition, the lamp panel 2 and the output terminal of the power supply 5 can also be directly connected together by rivet, solder paste, welding or wire bonding. In accordance with the fixing manner of the lamp panel 2, one side surface of the flexible circuit board is fixed to the inner circumferential surface of the lamp tube 1 by an adhesive sheet 4, and both ends of the flexible circuit board may be fixed or not fixed to the inner circumferential surface of the lamp tube 1.

If the lamp panel 2 is not fixed on the inner circumferential surface of the lamp tube 1 along the two axial ends of the lamp tube 1, if the lamp panel is connected by the wire, the wire may be broken because the two ends are free and the wire is easily shaken in the subsequent moving process. Therefore, the connection mode of the lamp panel 2 and the power supply 5 is preferably selected as welding, specifically, referring to fig. 22, the lamp panel 2 can be directly welded to the output end of the power supply 5 after climbing over the transition portion 103 of the strengthening portion structure, the use of a wire is omitted, and the stability of the product quality is improved. At this moment, the lamp panel 2 does not need to be provided with the female plug 201, the output end of the power supply 5 does not need to be provided with the male plug 51, and a specific implementation method can be that as shown in fig. 24, a power supply pad a is reserved at the output end of the power supply 5, and tin is reserved on the power supply pad a, so that the thickness of the tin on the pad is increased, welding is convenient, correspondingly, a light source pad b is also reserved at the end part of the lamp panel 2, and the power supply pad a at the output end of the power supply 5 and the light source pad b of the lamp panel 2 are. The plane on which the bonding pads are located is defined as the front surface, the connection mode of the lamp panel 2 and the power supply 5 is most stable in butt joint of the bonding pads on the front surfaces, but when welding, a welding pressure head needs to be pressed on the back surface of the lamp panel 2, the welding tin is heated through the lamp panel 2, and the problem of reliability is easy to occur. If a hole is formed in the middle of the light source pad b on the front surface of the lamp panel 2 and the light source pad b is overlaid on the power source pad a on the front surface of the power source 5 to be welded with the front surface facing upwards as shown in fig. 25, the welding pressure head can directly heat and melt the soldering tin, and the practical operation is easy to realize.

If both ends of the flexible circuit board are fixed to the inner circumferential surface of the lamp tube 1, it is preferable to provide the female socket 201 on the flexible circuit board and then insert the male socket 51 of the power supply 5 into the female socket 201 to electrically connect.

As shown in fig. 24, in the above embodiment, most of the flexible circuit board as the lamp panel 2 is fixed on the inner circumferential surface of the lamp tube 1, only two ends of the flexible circuit board are not fixed on the inner circumferential surface of the lamp tube 1, and the lamp panel 2 not fixed on the inner circumferential surface of the lamp tube 1 forms a free portion 21, when assembling, one end of the free portion 21 welded to the power supply 5 will drive the free portion 21 to contract towards the inside of the lamp tube 1, the free portion 21 of the lamp panel 2 will deform due to contraction, using the above lamp panel 2 with perforated weld pads, one side of the lamp panel 2 having the light source and the power supply pad a welded to the power supply 5 face the same side, when the free portion 21 of the lamp panel 2 deforms due to contraction, one end of the lamp panel 2 welded to the power supply 5 has a lateral pulling force towards the power supply 5, compared with the welding method that one side of the lamp panel 2 having the light, the lamp plate 2 and the 5 welded one end of power have a decurrent pulling force to power 5 in addition, use foretell lamp plate 2 that has the perforation weld pad, form the fixed reinforcing of structural electricity connection and have better effect. In this embodiment, light source pad b of lamp plate 2 is located lamp plate 2 and has the opposite side of light source, and light source pad b and the corresponding welded welding of power supply pad a of power 5 of lamp plate 2 are fixed. During assembly, the free portion 21 of the lamp panel 2 contracts and deforms toward the inside of the lamp 1, and the free portion 21 that deforms under force is located on the same side of the lamp panel 2 as the light source. It should be noted that, when the flexible circuit board mentioned as the lamp panel 2 has a structure in which two circuit layers sandwich a dielectric layer, the lamp panel 2 is not provided with the light source 202 and the end region protruding from the lamp tube 1 can be used as the free portion 21, so that the free portion 21 can realize the connection of the two circuit layers and the circuit layout of the power supply component.

As shown in FIG. 25, the light source pads b of the lamp panel 2 are two unconnected pads, which are electrically connected to the positive and negative electrodes of the light source 202, respectively, and the size of the pads is about 3.5 × 2mm²The printed circuit board of the power supply 5 also has a corresponding pad, and tin is reserved above the pad for automatic soldering of a soldering machine, wherein the thickness of tin is 0.1 to 0.7mm, preferably 0.3 to 0.5mm, and most preferably 0.4 mm. An insulating hole c can be arranged between the two welding pads to avoid the electric short circuit caused by the welding of the two welding pads in the welding process, and in addition, an insulating hole c can be arranged at the rear part of the insulating hole cAnd the positioning hole d is used for enabling the automatic welding machine to correctly judge the correct position of the light source bonding pad b.

The light source pad b of the lamp panel is provided with at least one welding pad which is respectively electrically connected with the anode and the cathode of the light source 202. In other embodiments, the number of the light source pads b may have more than one pad, such as 1, 2, 3, 4, or more than 4, in order to achieve compatibility and expandability for subsequent use. When the number of the welding pads is 1, the two corresponding ends of the lamp panel are respectively electrically connected with the power supply to form a loop, and at the moment, an electronic component replacing mode, such as an inductor replacing a capacitor, can be used as a current stabilizing component. As shown in fig. 26 to 28, when the number of the pads is 3, the 3 rd pad can be used as a ground, and when the number of the pads is 4, the 4 th pad can be used as a signal input terminal. Correspondingly, the power supply bonding pads a are also provided with the same number of bonding pads as the light source bonding pads b. When the number of the bonding pads is more than 3, the bonding pads can be arranged in a row in parallel or in two rows, and the bonding pads are arranged at proper positions according to the size of the accommodating area in practical use as long as the bonding pads are not electrically connected with each other to cause short circuit. In other embodiments, if part of the circuits are fabricated on the flexible circuit board, the light source pad b may only have a single pad, and the number of pads is smaller, which saves more process flow; the larger the number of the welding pads, the more the electric connection fixation between the flexible circuit board and the power output end is enhanced.

As shown in fig. 30, in other embodiments, the bonding pad of the light source pad b may have a structure of a solder through hole e, and the diameter of the solder through hole e may be 1 to 2mm, preferably 1.2 to 1.8mm, and most preferably 1.5mm, and if it is too small, the solder tin is not easy to pass through. When power supply 5's power pad a and the light source pad b of lamp plate 2 weld together, the tin of welding usefulness can pass welding perforation e, then pile up and cool off and condense above welding perforation e, form and have the solder ball structure g that is greater than welding perforation e diameter, this solder ball structure g can play like the function of nail, except that seeing through the tin between power supply pad a and the light source pad b fixed, can strengthen electric connection's firm the deciding because of solder ball structure g's effect even more.

As shown in fig. 31 to 32, in other embodiments, when the distance between the soldering through hole e of the light source pad b and the edge of the lamp panel 2 is less than or equal to 1mm, the soldering tin passes through the hole e and is accumulated at the edge above the hole, and the excessive tin flows back downward from the edge of the lamp panel 2 and then is condensed with the tin on the power source pad a, which is configured like a rivet to firmly pin the lamp panel 2 on the circuit board of the power source 5, thereby having a reliable electrical connection function. In addition, the diameter of the solder through hole e is too small to prevent the tin from passing through the hole, so the solder through hole e of the light source pad b can be directly changed into the solder notch f shown in fig. 33 and 34, the tin for soldering can electrically connect and fix the power source pad a and the light source pad b through the solder notch f, the tin can easily climb onto the light source pad b and be accumulated around the solder notch f, after cooling and condensation, more tin can form a solder ball with a diameter larger than that of the solder notch f, and the fixing capability of the electrical connection structure can be enhanced by the solder ball structure.

In other embodiments, the solder through hole of the solder pad is at the edge, that is, the solder pad has a solder gap, and the solder tin for soldering electrically connects and fixes the power pad a and the light source pad b through the solder gap, and the solder tin will be accumulated around the solder through hole, and when cooled, a solder ball with a diameter larger than the solder through hole will be formed, and this solder ball structure will form a structural electrical connection fixation enhancement.

The structure of the present embodiment can be achieved whether the through hole of the bonding pad is formed first or punched directly by the bonding head during the bonding process. The surface of the welding pressure head, which is contacted with the soldering tin, can be a plane or a surface with a concave part and a convex part, the convex part can be in a strip shape or a grid shape, the convex part does not completely cover the through hole, the soldering tin can penetrate out of the through hole, and when the soldering tin penetrates out of the welding through hole and is accumulated around the welding through hole, the concave part can provide a containing position of a solder ball. In other embodiments, the flexible circuit board as the lamp panel 2 has a positioning hole, so that the power pad a and the pad of the light source pad b can be accurately positioned through the positioning hole during welding.

Referring to fig. 35, in the embodiments of the present invention, the light source 202 may be further modified to include a bracket 202b having a groove 202a, and an LED die (or chip) 18 disposed in the groove 202 a. The groove 202a is filled with phosphor powder, and the phosphor powder covers the LED die (or chip) 18 to perform a light color conversion function. Specifically, the ratio of the length to the width of the LED die (or chip) is approximately 1:1 square compared to conventional LED dies. The ratio of the length to the width of the LED dies (or chips) 18 used in the embodiments of the present invention can be in a range from 2:1 to 10:1, and the ratio of the length to the width of the LED dies (or chips) 18 used in the embodiments of the present invention is preferably in a range from 2.5:1 to 5:1, and more preferably in a range from 3:1 to 4.5:1, so that the length direction of the LED dies (or chips) 18 is arranged along the length direction of the lamp tube 1, thereby improving the problems of the average current density of the LED dies (or chips) 18 and the light-emitting shape of the whole lamp tube 1.

In the embodiments of the present invention, there are a plurality of light sources 202 in one lamp tube 1, and the plurality of light sources 202 may be arranged in one or more rows, and each row of light sources 202 is arranged along the axial direction (Y direction) of the lamp tube 1.