阅读说明：本技术 镜头及其制造方法 (Lens and manufacturing method thereof ) 是由 陈时伟 江辰安 林宏盈 李嘉樟 于 2021-05-17 设计创作，主要内容包括：一种镜头及其制造方法,包含沿镜头的轴向依序设置的第一透镜、导光件及一第二透镜。导光件具有相对的一第一端及一第二端,且导光件的内表面接触第二透镜的至少一部份外缘。(A lens and a manufacturing method thereof are provided, which comprises a first lens, a light guide part and a second lens which are arranged in sequence along the axial direction of the lens. The light guide part is provided with a first end and a second end which are opposite, and the inner surface of the light guide part is contacted with at least one part of the outer edge of the second lens.)

1. A lens barrel, comprising:

the lens comprises a first lens, a light guide piece and a second lens which are sequentially arranged along an axial direction of the lens, wherein the light guide piece is provided with a first end and a second end which are opposite, and the inner surface of the light guide piece is contacted with at least one part of the outer edge of the second lens.

2. A lens barrel, comprising:

the lens comprises a first lens, a light guide piece and a second lens, wherein the first lens is provided with a positive refraction brightness and is arranged along an axial direction of the lens, the light guide piece is provided with openings at two ends, the end, farthest away from the second lens, of the light guide piece is a first end, the end, closest to the second lens, of the light guide piece is a second end, the area, surrounded by the inner circumference of the second end of the light guide piece, is smaller than the radial area of the second lens, the opening of the second end of the light guide piece is arranged at the narrowest position of the lens along the axial effective light area, and at least one part of the second lens is arranged in the light guide piece.

3. A lens barrel, comprising:

the lens comprises a first lens, a light guide piece and a second lens which are sequentially arranged along an axial direction of the lens, wherein openings are arranged at two ends of the light guide piece, the opening area of the first end of the light guide piece is larger than that of the second end, at least one part of the second lens is arranged in the light guide piece, and clamping structures are arranged at the opposite positions of the inner surface of the light guide piece and the outer edge of the second lens so as to be mutually fixed.

4. The lens barrel as claimed in claim 3, wherein the latch structure comprises at least one of the following structures:

(a) a flange formed on the light guide member;

(b) a flange formed on the second lens;

(c) a rough surface arranged between the light guide piece and the second lens;

(d) an adhesive layer disposed between the light guide and the second lens.

5. A lens barrel according to any one of claims 1 to 3, wherein the lens barrel satisfies one of the following conditions:

(1) the second lens and the light guide piece are integrally molded in a die;

(2) the second lens has negative refractive brightness.

6. The lens barrel according to any one of claims 1 to 3, wherein the lens barrel includes a third lens, and an area surrounded by an inner periphery of the second end of the light guide member is smaller than a radial area of the third lens.

7. A lens barrel, comprising:

the light guide part is provided with a first end and a second end which are opposite;

the first lens is arranged at the first end of the light guide piece, and the surface of the first end of the light guide piece covers at least one part of the surface of the first lens; and

the second lens is arranged at the second end of the light guide piece, and the surface of the second end of the light guide piece covers at least one part of the surface of the second lens.

8. The lens barrel according to any one of claims 1 to 3 and 7, wherein the lens barrel comprises:

and the aperture is close to the second end, the shortest distance between the second end and the aperture is less than 20mm, and the aperture completely falls into the area range enclosed by the periphery of the second end of the light guide piece.

9. The lens barrel according to any one of claims 1 to 3 or 7, wherein the lens barrel satisfies one of the following conditions:

(1) at least part of the light guide part is arranged outside the effective light distribution area of the lens;

(2) the light guide is a hollow cone.

10. A method for manufacturing a lens, the method comprising:

providing a lens barrel;

fixing a first lens and a second lens in the lens barrel; and

the light guide member is fixedly arranged in the lens cone, two ends of the light guide member in the axial direction are respectively a first end and a second end, the opening area of the first end is larger than that of the second end, the light guide member is configured to enable the first lens, the first end of the light guide member, the second lens and the second end of the light guide member to be sequentially arranged along the axial direction, and the inner surface of the light guide member is configured to contact at least one part of the outer edge of the second lens.

Technical Field

The invention relates to a lens and a manufacturing method thereof.

Background

In the conventional vehicular lamp projection lens, the light-emitting surface of the lens is prone to have a phenomenon of uneven brightness distribution, for example, as shown in fig. 1, the periphery of the light-emitting surface has an obvious dark area, that is, light cannot fill the whole range of the vehicular lamp lens, resulting in poor visual effect and low light utilization efficiency.

The background section is only provided to aid in understanding the present disclosure, and therefore the description in the background section may contain some prior art that does not constitute a person of ordinary skill in the art. The statements in the background section do not represent a complete description or a solution to one or more embodiments of the present invention, but are to be understood or appreciated by those skilled in the art before filing the present application.

Disclosure of Invention

Other objects and advantages of the present invention will be further understood from the technical features described in the present invention. In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

According to an aspect of the present invention, a lens includes a first lens, a light guide and a second lens sequentially disposed along an axial direction of the lens, wherein the light guide has a first end and a second end opposite to each other, and an inner surface of the light guide contacts at least a portion of an outer edge of the second lens.

According to another aspect of the present invention, a lens includes a first lens with positive refractive power, a light guide member with openings at two ends, and a second lens, wherein an end of the light guide member farthest from the second lens is a first end, an end of the light guide member closest to the second lens is a second end, an area surrounded by an inner circumference of the second end of the light guide member is smaller than a radial area of the second lens, and the opening of the second end of the light guide member is disposed at a narrowest position of an effective light area of the lens along an axial direction.

According to another aspect of the present invention, there is provided a lens comprising a first lens, a light guide member and a second lens sequentially arranged along an axial direction of the lens, wherein openings are formed at two ends of the light guide member, an area of the opening at the first end of the light guide member is larger than an area of the opening at the second end, and at least a portion of the second lens is disposed in the opening at the second end of the light guide member, wherein a position of the inner surface of the light guide member opposite to an outer edge of the second lens is provided with a locking structure for fixing the inner surface of the light guide member and the outer edge of the second lens.

According to another aspect of the present invention, a lens assembly includes a light guide, a first lens and a second lens. The light guide member has a first end and a second end opposite to each other, the first lens is disposed at the first end of the light guide member, and the second lens is disposed at the second end of the light guide member. The surface of the first end of the light guide member covers at least a part of the surface of the first lens, and the surface of the second end of the light guide member covers at least a part of the surface of the second lens.

According to the aspects of the present invention, the light guide member can improve the peripheral light quantity of the lens, reduce the area of the peripheral dark area, improve the overall brightness uniformity, and improve the visual quality. Furthermore, according to the above aspects of the present invention, since the inner surface of the light guide member can contact at least a portion of the outer edge of the second lens, the opening of the second end of the light guide member can be disposed at the narrowest position of the effective light area of the lens along the axial direction, or the surface of the second end of the light guide member can cover at least a portion of the surface of the second lens, for example, the effect of making most of the light entering the light guide member stray light outside the effective light area of the lens can be obtained, so that the stray light can be recovered to reduce the loss of light energy, thereby improving the light utilization efficiency. In addition, by the design of the clamping structure arranged at the relative position of the inner surface of the light guide part and the outer edge of the lens, the light guide part can be matched with the lens barrel to obtain the effect of fixing a plurality of lenses in the lens barrel, and additional fixing parts such as spacers and the like for fixing the lenses can be omitted.

Other objects and advantages of the present invention will be further understood from the technical features described in the present invention. In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for facilitating the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. Those skilled in the art, having the benefit of the teachings of this invention, may choose from the various possible shapes and proportional sizes to implement the invention as a matter of case.

Fig. 1 is a luminance distribution diagram of a light-emitting surface of a lens.

Fig. 2 is a schematic cross-sectional structure diagram of a lens barrel according to an embodiment of the invention.

Fig. 3 is a schematic perspective view of a light guide according to an embodiment of the invention.

Fig. 4 is a schematic cross-sectional view of a light guide member according to an embodiment of the invention.

Fig. 5 shows the brightness distribution of the light-emitting surface of the lens of fig. 2.

FIG. 6A shows a prior art design without a light guide.

Fig. 6B shows a graph comparing the X-axis illuminance distribution of the embodiment of fig. 2.

FIG. 7A shows a prior art design without a light guide.

Fig. 7B shows a comparison of the Y-axis illuminance distributions for the embodiment of fig. 2.

Fig. 8 is a schematic view showing a lens composition of a lens barrel according to an embodiment of the invention.

Fig. 9 is a schematic cross-sectional structure diagram of a lens barrel according to another embodiment of the invention.

Fig. 10 is a schematic cross-sectional view illustrating a lens barrel according to another embodiment of the invention.

Fig. 11 is a schematic cross-sectional structure diagram of a lens barrel according to another embodiment of the invention.

Fig. 12 is a schematic cross-sectional view illustrating a lens barrel according to another embodiment of the invention.

Fig. 13 is a schematic cross-sectional structure view of a lens barrel according to another embodiment of the invention.

Fig. 14 is a schematic cross-sectional view illustrating a lens barrel according to another embodiment of the invention.

Description of reference numerals:

10. 10a-10f lens

12 light guide

12a light guide inner surface

12b outer surface of light guide

12c light guide flange

121 first end

122 second end

121a, 122a openings

123a inner circumference

123b outer periphery

14 aperture

16 optical axis

18 light source

22 lens barrel

26 adhesive layer

I effective light

IS stray light

L1-L4 lens

LP lens flange

LS lens outer edge

M axial of light guide

N lens axial direction

PA peripheral dark space

Rough surface of R

S1, S2 surface

S curved surface

Detailed Description

The details of the present invention can be more clearly understood in conjunction with the accompanying drawings and the description of the embodiments of the present invention. However, the specific embodiments of the present invention described herein are for the purpose of illustration only and are not to be construed as limiting the invention in any way. Any possible variations based on the present invention may be conceived by the skilled person in the light of the teachings of the present invention, and these should be considered to fall within the scope of the present invention.

It will be understood that when an element is referred to as being "secured to" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may be present.

The foregoing and other technical and scientific aspects, features and utilities of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings. Directional terms as referred to in the following examples, for example: up, down, left, right, front or rear, etc., are referred to only in the direction of the attached drawings. Accordingly, the directional terminology is used for purposes of illustration and is in no way limiting.

Fig. 2 is a schematic cross-sectional structure view of a lens according to an embodiment of the invention, and fig. 3 is a schematic perspective view of a light guide (light guide) according to an embodiment of the invention. As shown in fig. 2, the lens 10 may include a barrel (not shown), a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 arranged along the lens axis N, and a light guide 12 may be disposed at a position adjacent to the first lens L1, the barrel may be a cylindrical body forming an accommodating space around the lens axis N, and each of the lenses L1-L4 and the light guide 12 is accommodated in the barrel. In the present embodiment, the light guide 12 is a structure for guiding the light emitted from the light source (e.g. LED) to the desired position, and the light emitted from the light source will pass through the light guide 12 and the lenses LL-L4 without entering the lens barrel. The structure of the light guide 12 is not limited, and may be, for example, a hollow cone or cylinder, a light guide plate, or a light guide tube. The first lens element L1 can have positive refractive power, the second lens element L2 can have negative refractive power, and the shape of each lens element can be biconcave, biconvex, plano-concave, plano-convex, crescent-shaped, or the like without limitation. As shown in fig. 2, in the present embodiment, the first lens L1, the light guide 12 and the second lens L2 are sequentially disposed along the lens axis N, the light guide 12 has an inner surface 12a and an outer surface 12b opposite to each other, and the inner surface 12a of the light guide 12 contacts at least a portion of the outer edge LS of the second lens L2.

As shown in fig. 3, in the embodiment, two ends of the light guide 12 in the axial direction M are a first end 121 and a second end 122, respectively, the first end 121 has an opening 121a, the second end has an opening 122a, and the area of the opening 121a of the first end may be larger than the area of the opening 122a of the second end. In other embodiments, the area of the first end opening 121a may also be smaller than or equal to the area of the second end opening 122 a. In the present embodiment, the light guide 12 is illustrated as having a hollow cone shape without limitation, and one end of the light guide 12 is a hollow body and has an inner periphery 123a and an outer periphery 123b opposite to each other, for example, a range enclosed by a dotted line of the inner periphery 123a shown in fig. 3 represents an area enclosed by the inner periphery 123a of the second end 122. Furthermore, in an embodiment, the light guide 12 may be configured such that the first lens L1, the first end 121, the second lens L2, the second end 122, and the third lens L3 are sequentially disposed along the axial direction M of the light guide 12.

Referring to fig. 2, in the present embodiment, the first lens L1, the first end 121 of the light guide 12, the second lens L2, the second end 122 of the light guide 12, and the third lens L3 may be sequentially disposed along the axial direction N of the lens, the second lens L2 may be wholly or partially disposed in the second end opening 122a of the light guide 12, and an area (e.g., a range surrounded by a dotted line of the inner periphery 123a shown in fig. 3) surrounded by the inner periphery 123a of the second end of the light guide 12 is smaller than a radial area of the third lens L3. Herein, the "radial area" of a lens is defined as the area of the lens projected along the axial direction N onto a plane orthogonal to the axial direction N. Furthermore, in the present embodiment, the area surrounded by the inner circumference of the end (the second end 122) of the light guide 12 closest to the second lens L2 is smaller than the radial area of the second lens L2. In other embodiments, more than one lens may be disposed in the light guide 12, or no lens may be disposed in the light guide 12.

Referring to fig. 2 again, in an embodiment, the shortest distance from the first end 121 of the light guide to the lens L1 may be smaller than the shortest distance from the second end 122 of the light guide to the lens L1. Furthermore, in an embodiment, the lens L1 may have a first surface S1 and a second surface S2 opposite to each other, and the shortest distance from the first end 121 of the light guide to the first surface S1 may be greater than the shortest distance from the first end 121 of the light guide to the second surface S2. In addition, the lens 10 may further include an aperture 14, the aperture 14 may be disposed adjacent to the second end 122 of the light guide, and the first surface S1, the second surface S2, the first end 121 of the light guide, and the aperture 14 may be sequentially arranged along the axial direction N. In one embodiment, the shortest distance between the second end 122 of the light guide and the aperture 14 may be less than 20mm, but is not limited thereto. In another embodiment, the shortest distance between the second end 122 of the light guide and the aperture 14 may be less than 10mm, and in still another embodiment, the shortest distance between the second end 122 of the light guide and the aperture 14 may be less than 5 mm. In one embodiment, the aperture 14 may completely fall within the area surrounded by the outer periphery 123b of the second end 122 of the light guide.

Fig. 4 is a schematic cross-sectional view of a light guide member according to an embodiment of the invention. As shown in fig. 4, in an embodiment, the effective light I of the lens 10 is a light ray whose traveling path passes through the curved surface S with refractive power of the second lens element L2 and enters the first lens element L1, and a distribution area of the effective light I in the lens 10 can be regarded as an effective light area of the lens (a portion of the effective light area of the lens is schematically shown by a dotted arrow in fig. 4). In the present embodiment, the opening (the opening 122a of the second end 122 is illustrated in fig. 4) at the end of the light guide 12 farthest from the first lens L1 is disposed at the narrowest position of the effective light area of the lens along the axial direction N. Furthermore, in the embodiment, the light guide 12 may be disposed outside the distribution region of the effective light I of the lens 10, that IS, outside the effective light region of the lens, so that the light entering the light guide 12 IS mainly the stray light IS, and the proceeding or imaging of the effective light I IS not affected, but the invention IS not limited thereto. In other embodiments, the light guide 12 may also be partially located in the lens effective light area and the rest IS located outside the lens effective light area, so as to obtain the effect of absorbing the stray light IS. By selecting the position of the light guide 12 relative to the effective light area of the lens, the light quantities of the stray light IS and the effective light I entering the light guide 12 can be adjusted according to actual requirements. In addition, because the embodiment utilizes the stray light, the stray light enters the light guide and emits light after being totally reflected in the light guide, and the light uniformity of the light-emitting surface of the lens is improved, so that the embodiment can be free from an aperture. Furthermore, by proper angle design of the wall surface of the light guide 12, the stray light IS (or a part of the effective light I) entering from the second end 122 of the light guide can be totally reflected in the light guide 12 and then emitted from the first end 121 of the light guide and guided to the peripheral area of the first surface S1 (the lens light emitting surface), so that the dark area of the periphery of the first surface S1 can be reduced, and the light uniformity of the lens light emitting surface can be improved. Furthermore, in an embodiment, the first end 121 of the light guide member may have a rough surface R (or a microstructure) to improve the light extraction efficiency.

Fig. 5 shows the brightness distribution of the first surface S1 (light-emitting surface of the lens) of the lens L1 according to the embodiment of the invention, compared with fig. 1 without the light guide, the embodiment of the invention can increase the peripheral light quantity of the lens, reduce the area of the peripheral dark area PA, and improve the overall brightness uniformity, thereby improving the visual quality. Fig. 6A and 6B are X-axis illuminance distribution comparison diagrams of the conventional design without the light guide and the embodiment of fig. 2, and fig. 7A and 7B are Y-axis illuminance distribution comparison diagrams of the conventional design without the light guide and the embodiment of fig. 2. As can be seen from fig. 6A and 6B and fig. 7A and 7B, the lens embodiment with the light guide member can significantly improve the peripheral light quantity and the overall brightness uniformity.

By the design of the above embodiments, the light guide 12 can increase the peripheral light quantity of the lens, reduce the area of the peripheral dark area, and improve the overall brightness uniformity, thereby improving the visual quality. Moreover, since most of the light entering the light guide 12 can be stray light IS outside the effective light area of the lens, the stray light IS can be recycled to reduce the loss of light energy, thereby obtaining the effect of improving the light utilization efficiency.

Fig. 8 and the following table show design parameters and shapes of the lenses of the lens barrel according to an embodiment of the invention. Fig. 8 shows an optical axis 16 from an image enlargement side OS (e.g., a light emitting side of a vehicle lamp) to an image reduction side IS (e.g., a light incident side close to the light source 18), in which a first lens L1, a second lens L2, a diaphragm 14, a third lens L3 and a fourth lens L4 are arranged in sequence, wherein design parameters and shapes of the respective lenses are as shown in the following table one.

Watch 1

It should be noted that in the above embodiments, the shape of the light guide member and the number of the matched lenses are not limited at all, and can be changed in accordance with the light emitting requirement. For example, as shown in fig. 9, the lens 10a may have only the first lens L1, the second lens L2 and the third lens L3,

in other embodiments, the lens L2 may not be disposed in the light guide 12, the lens L1 may be disposed at the first end 121 of the light guide, and the surface of the first end 121 of the light guide covers at least a portion of the surface of the lens L1, and the lens L3 may be disposed at the second end 122 of the light guide, and the surface of the second end 122 of the light guide covers at least a portion of the surface of the lens L3.

As shown in fig. 10, in another embodiment, the light guide 12 of the lens 10b may have an asymmetric structural design (for example, the side wall of the light guide 12 may have different inclination angles) to meet specific light emission requirements, and the light guide 12 may only be matched with two lenses L1 and L2, for example. Furthermore, in the above embodiments, if the light guide 12 is designed to be enough to take away most of the stray light around the periphery, one end of the light guide 12 can be used as a stop (stop) and the additional lens diaphragm 14 can be omitted. In an embodiment, the light guide 12 may be made of a plastic material (e.g., PC or PMMA), and each lens may be made of a glass material, but the invention is not limited thereto.

With the design of the above embodiments, the present invention can provide an embodiment of a lens manufacturing method. Firstly, a lens barrel is provided and a first lens and a second lens are fixed in the lens barrel, and a light guide part with openings at two ends is fixed in the lens barrel. The two axial ends of the light guide part are respectively a first end and a second end, and the opening area of the first end is larger than that of the second end. Furthermore, the light guide member is configured such that the first lens, the first end of the light guide member, the second lens, and the second end of the light guide member are sequentially disposed along the axial direction, and the light guide member is configured such that the inner surface of the light guide member contacts at least a portion of the outer edge of the second lens.

Different embodiments of the fixing method between the light guide 12 and the lens will be described below. As shown in FIG. 11, the light guide 12 of the lens 10c can form a flange 12c, so that the top of the light guide 12 can abut against the lens L1 and the flange 12c can abut against the lens L2. With such a design, the light guide 12 itself can be used with the lens barrel 22 to obtain the effect of fixing a plurality of lenses in the lens barrel 22, and additional fixing members such as spacers (spacers) for fixing the lenses can be omitted. As shown in fig. 12, in another embodiment, the lens L2 may also form a flange LP, the top end of the light guide 12 of the lens 10d may abut against the lens L1 and the bottom end may abut against the flange LP of the lens L2, and the effect of fixing a plurality of lenses on the lens barrel 22 by using only the light guide 12 can also be obtained. In one embodiment, the light guide flange 12c or the lens flange LP may be annular. In the above embodiment, the flange 12c is disposed on the inner surface of the light guide 12 and the flange LP is disposed on the outer edge of the lens L2, but it is not limited thereto. In various embodiments of the present invention, the position, shape and structural form of the locking structure for fixing the light guide and the lens to each other are not limited, and the lens fixed by the locking structure is not limited to the exemplary lens L2.

In another embodiment, the light guide 12 and at least one lens can be integrally molded by in-mold injection, for example, as shown in fig. 13, after the light guide 12 of the lens 10e and at least one lens (e.g., lens L2) are integrally molded by in-mold injection, the top end of the light guide 12 can abut against the lens L1 to fix each lens in the lens barrel 22. In another embodiment, as shown in fig. 14, a rough surface R may be formed on the outer edge of the lens L2 of the lens 10f or the inner surface of the light guide 12, so that the lens L2 is fixed relative to the light guide 12 by friction resistance and does not slide in the axial direction of the lens, or an adhesive layer 26 such as a spot glue layer may be disposed between the lens L2 and the light guide 12, so that the lens L2 is adhered to the light guide 12 and abuts against the lens barrel 22, thereby obtaining the effect of keeping fixed in the lens barrel 22.

Although the present invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Moreover, not all objects, advantages, or features described herein are necessarily to be achieved in any one embodiment or claimed herein. In addition, the abstract and the title of the invention are provided for assisting the search of patent documents and are not intended to limit the scope of the invention.