阅读说明：本技术 白光照明装置 (White light lighting device ) 是由 杨凯栋 梁有庆 张德峰 聂宗福 胡红 于 2021-07-29 设计创作，主要内容包括：本申请涉及一种白光照明装置。所述白光照明装置包括：白光光源,具有输出白光的出光面,所述白光由蓝光和黄光混合而成；二次光学器件,位于所述白光的输出光路上,用于改变所述白光的输出光路；反射器件,位于所述白光的输出光路上,用于反射出射角大于角度阈值的黄光。采用本申请能够消除白光边缘黄斑。(The present application relates to a white light illumination device. The white light illumination device includes: the white light source is provided with a light emitting surface for outputting white light, and the white light is formed by mixing blue light and yellow light; the secondary optical device is positioned on the output light path of the white light and used for changing the output light path of the white light; and the reflecting device is positioned on the output light path of the white light and used for reflecting the yellow light of which the emergent angle is greater than the angle threshold. By adopting the method and the device, yellow spots at the edges of white light can be eliminated.)

1. A white light illumination device, comprising:

a white light source (10) having a light exit surface (11) that outputs white light, the white light being a mixture of blue light and yellow light;

a secondary optic (20) located on an output optical path of the white light for altering the output optical path of the white light;

and the reflecting device (30) is positioned on the output light path of the white light and used for reflecting the yellow light with the exit angle larger than the angle threshold value.

2. The white light illumination device according to claim 1, characterized in that the reflecting means (30) comprises:

a transparent carrier (31) located at the edge of the light exit surface (11);

a plurality of DBR film layers (32) which are arranged in the transparent carrier (31) at intervals; each DBR film layer (32) is formed by alternately laminating two material layers with different refractive indexes, the thickness of each material layer is equal to one fourth of the yellow wavelength, and the laminating directions of the plurality of DBR film layers (32) are different in the transparent carrier (31).

3. The white light illumination device according to claim 2, wherein an included angle between a vertical plane of the plurality of DBR film layers (32) in the transparent carrier (31) and the light emitting surface (11) increases gradually in a direction away from the light emitting surface (11).

4. The white light illumination device according to claim 3, wherein a stacking direction of the DBR film layers (32) closest to the light exit surface (11) among the plurality of DBR film layers (32) is perpendicular to at least one surface of the transparent carrier (31) in the transparent carrier (31).

5. The white light illumination device according to claim 3, wherein a stacking direction of the DBR film layers (31) farthest from the light emitting surface (11) among the plurality of DBR film layers (31) is parallel to the light emitting surface (11) in the transparent carrier (31).

6. The white light illumination device of any one of claims 1 to 5, wherein the angular threshold is 30 ° to 60 °.

7. The white light illumination device according to any one of claims 1 to 5, characterized in that the reflection means (30) further comprises:

the support frame (33) comprises a cavity (332) with an opening (331), the white light source (10) is located in the cavity (332), the opening (331) is opposite to the light emitting surface (11), and the transparent carrier (31) is arranged on the edge of the cavity (332) forming the opening (331).

8. The white light illumination device of claim 7, wherein the support frame (33) is disposed such that at least a portion of the surface of the transparent carrier (31) and the light emitting surface (11) are located on the same plane.

9. The white light illumination device of claim 8, characterized in that the reflection means (30) further comprises:

and the transparent cover plate (34) is opposite to the light emergent surface (11) and is connected with the transparent carrier (31) into a whole.

10. The white light illumination device of any one of claims 1 to 5, characterized in that the reflecting means (30) is located between the white light source (10) and the secondary optics (20).

Technical Field

The invention relates to the technical field of semiconductors, in particular to a white light illuminating device.

Background

With the development of lighting technology, a technology of lighting by using a white-light LED (light-emitting diode) has appeared. At present, a white light LED generally utilizes blue light emitted by a blue light LED to excite yellow fluorescent powder to form yellow light, and the yellow light is mixed with blue light of the unlasered yellow fluorescent powder to form white light.

White light LEDs have the advantages of high luminous efficiency, long life, no pollution, etc., and have become the mainstream lighting sources. However, the light intensity distribution curve of the white light LED is usually lambertian, and the directly output white light cannot meet the requirement of illuminating a scene. In the conventional technology, a secondary optical structure is arranged on an output light path of white light so as to efficiently utilize light energy and achieve a required lighting effect.

However, the white light formed by mixing the blue light and the yellow light is refracted in the secondary optical structure, and the refractive index is inversely proportional to the wavelength and the refraction angle. Since the wavelength of the yellow light is greater than that of the blue light, the refractive index of the yellow light in the secondary optical structure is less than that of the blue light, and the refraction angle of the yellow light in the secondary optical structure is greater than that of the blue light, so that yellow light which is not mixed with the blue light exists on the edge of the white light, yellow spots appear, a dispersion phenomenon is formed, and the illumination effect of the white light LED is influenced.

Disclosure of Invention

In view of the above, it is necessary to provide a white light illumination device capable of eliminating white light edge macula lutea in order to solve the problem that the macula lutea appears at the white light edge and affects the illumination effect.

A white light illumination device, comprising:

the white light source is provided with a light emitting surface for outputting white light, and the white light is formed by mixing blue light and yellow light;

the secondary optical device is positioned on the output light path of the white light and used for changing the output light path of the white light;

and the reflecting device is positioned on the output light path of the white light and used for reflecting the yellow light of which the emergent angle is greater than the angle threshold.

In one embodiment, the reflective device comprises:

the transparent carrier is positioned at the edge of the light-emitting surface;

a plurality of DBR film layers arranged at intervals in the transparent carrier; each DBR film layer is formed by alternately laminating two material layers with different refractive indexes, the thickness of each material layer is equal to one fourth of the yellow wavelength, and the laminating directions of the plurality of DBR film layers are different in the transparent carrier.

In one embodiment, an included angle between a vertical plane of the stacking direction of the plurality of DBR film layers in the transparent carrier and the light emitting surface increases one by one along a direction away from the light emitting surface.

In one embodiment, a stacking direction of a DBR film layer closest to the light exit surface among the plurality of DBR films is perpendicular to at least one surface of the transparent carrier in the transparent carrier.

In one embodiment, a stacking direction of a DBR film layer farthest from the light emitting surface among the plurality of DBR films is parallel to the light emitting surface in the transparent carrier.

In one embodiment, the angle threshold is 30 ° to 60 °.

In one embodiment, the reflective device further comprises:

the support frame comprises a cavity with an opening, the white light source is positioned in the cavity, the opening is opposite to the light emergent surface, and the transparent carrier is arranged on the edge of the cavity, which forms the opening.

In one embodiment, the support frame is arranged such that at least a portion of the surface of the transparent carrier and the light emitting surface are located on the same plane.

In one embodiment, the reflective device further comprises:

and the transparent cover plate is opposite to the light emergent surface and is connected with the transparent carrier into a whole.

In one embodiment, the reflective device is located between the white light source and the secondary optic.

According to the white light illuminating device, the white light formed by mixing the blue light and the yellow light is output from the light emitting surface of the white light source, and the secondary optical device is positioned on the output light path of the white light, so that the output light path of the white light can be changed, and the required illuminating effect is achieved. Meanwhile, the reflecting device is arranged on the output light path of the white light, and the yellow light with the exit angle larger than the angle threshold value is reflected, so that the yellow light output without mixing the white light edge with the blue light can be avoided, the yellow spots appearing on the white light edge are eliminated, the dispersion phenomenon of white light illumination is improved, and the illumination effect is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is an exploded view of an embodiment of a white light illumination device;

FIG. 2 is a schematic diagram of a reflective device in one embodiment;

FIG. 3 is a schematic diagram of a secondary optic in an embodiment.

Description of reference numerals: 10-white light source, 11-light-emitting surface, 20-secondary optical device, 30-reflecting device, 31-transparent carrier, 32-DBR film layer, 33-support frame, 331-cavity, 332-opening and 40-base.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

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 also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

In one embodiment, as shown in FIG. 1, a white light illumination device is provided, comprising a white light source 10, secondary optics 20, and a reflective device 30. The white light source 10 has a light emitting surface 11 for outputting white light, and the white light is formed by mixing blue light and yellow light. The secondary optics 20 are located on the output path of the white light for changing the output path of the white light. As shown in fig. 2, a reflecting device 30 is located on the output light path of the white light for reflecting yellow light having an exit angle greater than the angular threshold.

The exit angle is an angle between a direction of yellow light exiting from the light exit surface 11 and a normal.

In this embodiment, the light emitting surface of the white light source outputs white light formed by mixing blue light and yellow light, and the secondary optical device is located on the output optical path of the white light, so that the output optical path of the white light can be changed, and a required illumination effect can be achieved. Meanwhile, the reflecting device is arranged on the output light path of the white light, and the yellow light with the exit angle larger than the angle threshold value is reflected, so that the yellow light output without mixing the white light edge with the blue light can be avoided, the yellow spots appearing on the white light edge are eliminated, the dispersion phenomenon of white light illumination is improved, and the illumination effect is improved.

In practical application, the transparent carrier with the accommodating cavity can be formed, the DBR film layer is laid on the same bearing plate as the transparent carrier, and then the bearing plate with the laid DBR film layer is inserted into the accommodating cavity, so that the assembly of the transparent carrier and the DBR film layer can be completed.

Or inserting the laying of the DBR film layer in the deposition process of the transparent carrier, and continuing to deposit the transparent carrier on the DBR film layer, or completing the assembly of the transparent carrier and the DBR film layer.

The DBR film layers can also be respectively paved on a plurality of transparent carriers, and then the plurality of transparent carriers paved with the DBR film layers are adhered together to complete the assembly of the transparent carriers and the DBR film layers.

Illustratively, the white light source 10 includes a blue LED chip and a yellow phosphor layer disposed on a light emitting surface of the blue LED chip.

And the light emitting surface of the blue LED chip outputs blue light. The blue light enters the yellow fluorescent powder layer, a part of the blue light excites the yellow fluorescent powder in the yellow fluorescent powder layer to form yellow light, and the other part of the blue light passes through the yellow fluorescent powder layer. The surface of the yellow fluorescent powder layer, which faces away from the blue light LED chip, is a light emitting surface 11 of the white light source 10, and outputs a white light formed by mixing blue light and yellow light.

Specifically, the white light source 10 is 3030LED light source.

Illustratively, the secondary optics 20 include a lens. For example, the convex lens can converge light, so that the cross-sectional area of a white light output light path can be reduced, and the effect of improving illumination brightness is achieved. For another example, the concave lens plays a role in dispersing light, so that the cross-sectional area of a white light output light path can be increased, and the effect of increasing an illumination area is achieved.

Specifically, as shown in fig. 1, the secondary optics 20 is in the shape of a spherical cap, and the lighting device may be applied to a projector lamp. The white light source 10 is located in the spherical cap, and the light-emitting surface of the white light source 10 faces away from the bottom surface of the spherical cap, so that the white light output from the light-emitting surface of the white light source 10 is emitted to the secondary optical device 20, thereby realizing that the secondary optical device 20 is located on the output light path of the white light.

Alternatively, as shown in fig. 3, the top of the spherical cap is flat or concave, and the lighting device can be applied to a street lamp.

In one embodiment, as shown in fig. 2, the reflective device 30 includes a transparent carrier 31 and a plurality of DBR (distributed bragg reflector) film layers 32. The transparent carrier 31 is located at the edge of the light emitting surface 11. A plurality of DBR film layers 32 are disposed at intervals within the transparent carrier 31. Each DBR film layer 32 is formed by alternately laminating two material layers having different refractive indexes, each material layer has a thickness equal to one quarter of the wavelength of yellow light, and the laminating directions of the plurality of DBR film layers 32 are different from each other in the transparent carrier.

In this embodiment, the transparent carrier 31 is located at the edge of the light emitting surface 11, and the plurality of DBR film layers are disposed at intervals in the transparent carrier, so that the plurality of DBR film layers 32 are disposed at intervals on the edge of the light emitting surface 11, and are disposed on the output light path of the white light. Each DBR film layer 32 is formed by alternately laminating two materials having different refractive indexes, the thickness of each material layer is equal to one fourth of the wavelength of yellow light, and the laminating directions of the plurality of DBR film layers 32 are different from each other in the transparent carrier, so that the plurality of DBR film layers 32 can reflect yellow light having an exit angle larger than an angle threshold, thereby realizing the function of a reflective device and not reflecting yellow light incident in other directions and blue light incident in various directions.

Specifically, the transparent carrier 31 is provided with accommodating cavities corresponding to the plurality of DBR film layers 32 one to one, and each DBR film layer 32 is disposed in the corresponding accommodating cavity. The size and the shape of the accommodating cavity are consistent with those of the corresponding DBR film layers 32, namely, each DBR film layer 32 fills the corresponding accommodating cavity, and the DBR film layers 32 are prevented from shifting in the accommodating cavities.

Specifically, the surface of the white light incident into the transparent carrier 31 is parallel to the surface of the white light incident out of the transparent carrier 31, so as to ensure that the exit angle of the white light is unchanged after passing through the transparent carrier 31.

Illustratively, as shown in fig. 1, the transparent carrier 31 is a conical surface of a truncated cone, and the cross-sectional area of the truncated cone gradually decreases in a direction away from the light emitting surface 11. Thus, the transparent carrier 31 extends from the edge of the light exit surface 11 in a direction away from the light exit surface 11 and is inclined towards the center of the light exit surface 11 during the process of being away from the light exit surface 11, for example, at an angle of 45 °.

In practical applications, the shape of the transparent carrier 31 can be adjusted according to the shape of the white light source 10. For example, as shown in fig. 1, if the white light source 10 is a rectangular parallelepiped, the transparent carrier 31 is a square cone. In another example, the white light source 10 is a cylinder, and the transparent carrier 31 is a cone.

Specifically, the transparent carrier 31 may be formed of glass, PC (Polycarbonate) material, or PMMA (polymethyl methacrylate), such as optical glass BK 7. The glass, the PC material and the PMMA are all transparent materials, and the normal light emitting of the white light source 10 cannot be influenced.

Illustratively, the DBR film 32 is a layered structure that spreads along the conical surface of a truncated cone.

Specifically, the difference between the refractive indexes of the two material layers in the DBR layer 32 is greater than the threshold refractive index value, so that the difference between the refractive indexes of the two material layers in the DBR layer 32 is relatively large, and the reflectivity of the DBR layer 32 is improved.

Specifically, the number of the same material layer in the DBR film layer 32 is greater than the number threshold, so that the number of layers of the two material layers in the DBR film layer 32 is greater, and the reflectivity of the DBR film layer 32 is improved.

In practical applications, the number of materials and material layers in the DBR layer 32 can be adjusted according to the reflectivity.

In one embodiment, as shown in fig. 2, an included angle α between a vertical plane of the stacking direction of the plurality of DBR layers 32 in the transparent carrier 31 and the light emitting surface 11 increases gradually along a direction away from the light emitting surface 11.

In practical applications, as shown in fig. 2, the stacking direction of the plurality of DBR films 32 is different from one another in the transparent carrier 31, and the transparent carrier 31 generally has a regular shape and cannot match the stacking direction of all the DBR films 32 in the transparent carrier 31, so that a part of the DBR films 32 cannot be spread over the entire area. The included angle between the vertical plane of the stacking direction of the plurality of DBR films 32 in the transparent carrier 31 and the light emitting surface 11 increases one by one along the direction away from the light emitting surface 11, the included angle between the vertical plane of the stacking direction in the transparent carrier 31 and the light emitting surface 11 is larger, the distance between the DBR films 32 and the light emitting surface 11 is further, and large-angle light emitted from the light emitting surface 11 can be effectively blocked under the condition that a part area is spread in the transparent carrier 31.

Illustratively, as shown in fig. 2, the stacking direction of the DBR film layer 32 closest to the light exit surface 11 among the plurality of DBR film layers 32 is perpendicular to at least one surface of the transparent carrier 31 in the transparent carrier 31.

In the present embodiment, as shown in fig. 2, a stacking direction of the DBR film layer 32 closest to the light exit surface 11 among the plurality of DBR film layers 32 is perpendicular to at least one surface of the transparent carrier 31 in the transparent carrier 31, and this DBR film layer 32 can be spread over the entire area, and can effectively reflect yellow light incident along the stacking direction. Moreover, the surface of the transparent carrier 31 can be used to determine the stacking direction of the DBR film layer 32 in the transparent carrier 31, so as to facilitate the reflection of the yellow light exit angle according to the requirement, and adjust the installation angle of the reflective device 30, so as to ensure that the DBR film layer 32 reflects the corresponding yellow light according to the requirement.

Illustratively, the stacking direction of the DBR film 31 farthest from the light exit surface 11 among the plurality of DBR films 32 is parallel to the light exit surface 11 in the transparent carrier 31.

In this embodiment, an included angle between a vertical plane of the plurality of DBR films 32 in the transparent carrier 31 and the light emitting surface 11 increases gradually along a direction away from the light emitting surface 11, and a stacking direction of the DBR film 31 farthest from the light emitting surface 11 in the plurality of DBR films 32 is parallel to the light emitting surface 11 in the transparent carrier 31, that is, an emission angle of yellow light reflected by the plurality of DBR films 32 is 180 ° at most, at this time, the plurality of DBR films 32 can reflect all yellow light emitted at a large angle, and output of yellow light of which a white light edge is not mixed with blue light is effectively avoided.

The transparent carrier 31 is installed in the transparent carrier 31 in a range of the stacking direction of the plurality of DBR film layers 32 in the transparent carrier 31 from the direction parallel to the light emitting surface 11 to the direction perpendicular to at least one surface of the transparent carrier 31 by combining the stacking direction of the DBR film layers 32 closest to the light emitting surface 11 among the plurality of DBR film layers 32, so that the dispersed yellow light can be reflected, and the illumination effect of the illumination device can be effectively improved.

In practical applications, the number of the DBR layers 32 and the stacking direction of each DBR layer in the transparent carrier 31 may be set according to the emission angle range of the reflected yellow light.

In other embodiments, the included angle between the vertical plane of the stacking direction of the DBR films 32 in the transparent carrier 31 and the light emitting surface 11 may decrease one by one along the direction away from the light emitting surface 11, may increase and then decrease along the direction away from the light emitting surface 11, may decrease and then increase along the direction away from the light emitting surface 11, and various changes may reflect the yellow light incident along the stacking direction of each DBR film 32.

In the above embodiment, the range of the stacking direction of the plurality of DBR layers 32 in the transparent carrier 31 may also be between the direction parallel to the light exit surface 11 and the direction perpendicular to at least one surface of the transparent carrier 31.

Illustratively, the angle threshold is 30 ° to 60 °, such as 45 °.

In one embodiment, as shown in fig. 2, the reflective device 30 further comprises a support frame 33, and the support frame 33 comprises a cavity 332 having an opening 331. The white light source 10 is located in the cavity 332, the opening 331 is opposite to the light emitting surface 11, and the transparent carrier 31 is disposed on an edge of the cavity 332 forming the opening 331.

In this embodiment, the supporting frame 33 includes a cavity 332 having an opening 331, the white light source 10 is located in the cavity 332, and the opening 331 is opposite to the light emitting surface 11, which does not affect the white light output by the white light source 10. Meanwhile, the transparent carrier 31 is disposed on the edge of the cavity 332 forming the opening 331, can reflect yellow light having an exit angle larger than the angle threshold, and does not affect the white light source 10.

Specifically, the support frame 33 is formed of glass, and may be integrally formed with the transparent carrier 31. And the glass has better support property and can not influence the light emission.

Exemplarily, as shown in fig. 2, the surface of the supporting frame 33 on which the transparent carrier 31 is disposed is at least partially located on the same surface as the light emitting surface 11.

In the embodiment, the supporting frame 33 is disposed on the same surface as at least a portion of the surface of the transparent carrier 31 and the light emitting surface 11, so as to effectively prevent the transparent carrier 31 from interfering with the white light source 10.

Specifically, the height of the support frame 33 is the same as that of the white light source 10, such as 0.65 mm.

Alternatively, the surface of the supporting frame 33 on which the transparent carrier 31 is disposed may be annular or a conical surface of a truncated cone, and the cross-sectional area gradually decreases along a direction away from the transparent carrier 31, so as to facilitate the bottom surface of the transparent carrier 31 to be attached.

In practical applications, the shape of the surface of the supporting frame 33 on which the transparent carrier 31 is disposed can be adjusted according to the shape of the white light source 10. For example, as shown in fig. 1, if the white light source 10 is a rectangular parallelepiped, the surface of the supporting frame 33 on which the transparent carrier 31 is disposed is a square ring or a conical surface of a pyramid. For another example, if the white light source 10 is a cylinder, the surface of the supporting frame 33 on which the transparent carrier 31 is disposed is a conical surface of a circular ring or a cone.

Illustratively, as shown in fig. 2, the inner wall of the cavity 332 is spaced apart from the white light source 10.

In this embodiment, the inner wall of the cavity 332 and the white light source 10 are disposed at an interval, so that interference between the reflective device 30 and the white light source 10 can be effectively avoided, and the white light source 10 is not affected.

The reflective device 30 further comprises a transparent cover 34, wherein the transparent cover 34 is opposite to the light emitting surface 11 and is integrated with the transparent carrier 31.

Specifically, the material of the transparent cover plate 34 is the same as that of the transparent carrier 31.

In particular, the transparent cover plate 34 may be integrally formed with the transparent carrier 31. For example, the transparent carrier 31 is a conical surface of a truncated cone, and the transparent cover 34 may be integrally formed with the transparent carrier 31 at the smallest cross-sectional area of the truncated cone.

In one embodiment, as shown in FIG. 1, a reflective device 30 is positioned between the white light source 10 and the secondary optics 20.

In the present embodiment, the reflective device 30 is located between the white light source 10 and the secondary optical device 20, and the reflective device 30 can be fixed with the white light source 10 and the secondary optical device 20 by using the existing packaging method.

In other embodiments, the reflective device 30 is located on a side of the secondary optic 20 facing away from the white light source 10, i.e., the secondary optic 20 is located between the white light source 10 and the reflective device 30.

In one embodiment, as shown in fig. 1, the white light illumination apparatus further includes a base 40, and the white light source 10, the secondary optics 20, and the reflection device 30 are respectively disposed on the base 40.

Specifically, as shown in fig. 1, the base 40 is a rectangular parallelepiped.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.