Optical element and lighting device having the same

Abstract

The present invention discloses an optical element and a lighting device for processing light emitted by a light source, comprising a light incident surface and a light emitting surface, wherein the light emitting surface comprises a first curved surface and a second curved surface which are symmetrically arranged, and the light incident surface comprises a first light incident surface and a second light incident surface which are symmetrically arranged, wherein the first light incident surface and the second light incident surface respectively have microstructures, and a depression is formed at the connection between the first curved surface and the second curved surface, and the light incident surface, the light emitting surface and the light source are connected by any straight line, and the difference between the distance from the light emitting surface to the light source and the distance from the light incident surface to the light source on the straight line is less than 2 mm.

Description

[Technical field]

[0002] The present invention relates to an optical element and a lighting device, in particular to a lighting device with the optical element. [Background technology]

[0004] With the advancement of lighting technology, LED lights are increasingly widely used in various lighting environments. Many ceiling lamps or advertising light boxes in the prior art still use traditional fluorescent tubes, which have low light efficiency and high energy consumption. From the perspective of replacement, LED tubes can easily replace fluorescent tubes in ceiling lamps. However, due to the limitations of the light distribution angle and shape of the tube, the dark area problem on the ceiling lamp mask cannot be solved, and ugly dark stripes will be formed on the mask.

[0005] Therefore, in order to overcome the above-mentioned defects, it is necessary to provide an improved optical element and lighting device. [Summary of the invention]

[0007] An object of the present invention is to provide an optical element.

[0008] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an optical element for processing light emitted by a light source, comprising a light incident surface and a light emitting surface, the light emitting surface comprising a first curved surface and a second curved surface symmetrically arranged, the light incident surface comprising a first light incident surface and a second light incident surface symmetrically arranged, the first light incident surface and the second light incident surface respectively having microstructures, a depression being formed at the connection between the first curved surface and the second curved surface, the light incident surface, the light emitting surface and the light source being connected by any straight line, and the difference between the distance from the light emitting surface to the light source and the distance from the light incident surface to the light source on the straight line is less than 2 mm.

[0009] Preferably, the distance between any point on the light incident surface and the light source is greater than 2 mm.

[0010] Preferably, a recess is also formed at the connection between the first light incident surface and the second light incident surface.

[0011] Preferably, the first curved surface and the second curved surface are smooth surfaces.

[0012] Preferably, the microstructures of the first light incident surface and the second light incident surface are symmetrically distributed.

[0013] Preferably, the microstructure of the first light incident surface includes a first sawtooth portion, a second sawtooth portion, and a smooth first smooth portion located between the first sawtooth portion and the second sawtooth portion and connecting the first sawtooth portion and the second sawtooth portion.

[0014] Preferably, the microstructure of the second light incident surface includes a third sawtooth portion and a fourth sawtooth portion in a sawtooth shape, and a smooth second smooth portion located between the third sawtooth portion and the fourth sawtooth portion and connecting the third sawtooth portion and the fourth sawtooth portion.

[0015] Preferably, the first serration of the first light incident surface is connected to the third serration of the second light incident surface, so that a connection between the first light incident surface and the second light incident surface has a continuous serration-shaped microstructure.

[0016] Preferably, a connection between the first light incident surface and the second light incident surface is a smooth surface.

[0017] Preferably, the optical element is made of two materials with different transmittances, and the connection between the first light incident surface and the second light incident surface and the connection between the first light emitting surface and the second light emitting surface are located at the center of the optical element, and their transmittances are lower than those on both sides of the optical element.

[0018] Compared with the prior art, the optical element of the present invention has the following advantages: reducing the light intensity in the central part and forming a uniform light distribution, so that the light emitted through the optical element is evenly distributed without dark areas.

[0019] Another object of the present invention is to provide a lighting device.

[0020] In order to achieve the above objectives, the present invention adopts the following technical solution: a lighting device, comprising the above optical element, a light source and a shell integrally formed with the optical element, wherein the light source is located in a containing space formed by the optical element and the shell.

[0021] Preferably, the housing is made of insulating material.

[0022] Preferably, an air groove is provided between the light source and the optical element, the light source comprises a light source board and LED particles, and the light source board is connected to the bottom of the housing.

[0023] Preferably, both sides of the shell have mounting grooves respectively, and both sides of the light source board are respectively located in the mounting grooves so as to fix the light source board in the shell.

[0024] Preferably, air grooves are provided between the light source, the optical element and the housing.

[0025] Preferably, a mounting groove is provided at a connection point between the optical element and the housing, and the light source is installed in the mounting groove.

[0026] Preferably, two sides of the shell have "X"-shaped fixing grooves, and the fixing grooves are recessed toward the inside of the shell.

[0027] Preferably, the light source includes a light source plate and LED particles, the LED particles are arranged in rows, and when the connection between the first light incident surface and the second light incident surface of the optical element and the LED particles are projected onto the bottom surface of the shell, the projection of the connection between the first light incident surface and the second light incident surface at least partially overlaps with the projection of the LED particles.

[0028] Compared with the prior art, the lighting device of the present invention has the following advantages: simple structure, uniform light distribution, and no dark areas.

Brief Description of the Drawings

[0030] Figure 1 It is a side view of the lighting device according to the first preferred embodiment of the present invention.

[0031] Figure 2 It is a three-dimensional view of the optical element and the housing of the lighting device according to the first preferred embodiment of the present invention.

[0032] Figure 3 It is a side view of a lighting device according to a second preferred embodiment of the present invention. [Specific implementation method]

[0034] Please refer to Figure 1 and Figure 2 As shown, an optical element 10 of the first preferred embodiment of the present invention is used to process the light emitted by the light source 30, including a light incident surface 101 and a light emitting surface 102, and the light emitting surface 102 includes a first curved surface 1021 and a second curved surface 1022 that are symmetrically arranged. The light incident surface 101 includes a first light incident surface 1011 and a second light incident surface 1012 that are symmetrically arranged. The first light incident surface 1011 and the second light incident surface 1012 have microstructures respectively, and a concave is formed at the connection 1023 of the first curved surface 1021 and the second curved surface 1022. When any straight line (not shown) is used to connect the light incident surface 101, the light emitting surface 102 and the light source 30, the difference between the distance from the light emitting surface 102 to the light source 30 and the distance from the light incident surface 102 to the light source on the straight line is less than 2 mm. The optical element 10 of the present invention is a light homogenizing cover instead of a lens. The optical element 10 has a shape and a microstructure so that after the light from the light source 30 passes through the optical element 10, the light distribution is uniform and the light intensity in the center is not too strong to form dark spots in other parts.

[0035] A concave is also formed at the connection 1013 between the first light incident surface 1011 and the second light incident surface 1012. That is, the light incident surface 101 and the light emitting surface 102 are substantially parallel. In other embodiments, the connection 1013 between the first light incident surface 1011 and the second light incident surface 1012 may not form a concave.

[0036] In this embodiment, the distance between any point of the light incident surface 101 and the light source 30 is greater than 2 mm. In other embodiments, the distance between the light incident surface 101 and the light source 30 can also be adjusted as needed.

[0037] The first curved surface 1021 and the second curved surface 1022 are smooth surfaces. The microstructures of the first light-entering surface 1011 and the second light-entering surface 1012 are symmetrically distributed. The microstructure of the first light-entering surface 1011 includes a first sawtooth portion 10111 and a second sawtooth portion 10112 in a sawtooth shape, and a smooth first smooth portion 10113 located between the first sawtooth portion 10111 and the second sawtooth portion 10112 and connecting the first sawtooth portion 10111 and the second sawtooth portion 10112. The microstructure of the second light-entering surface 1012 includes a third sawtooth portion 10121 and a fourth sawtooth portion 10122 in a sawtooth shape, and a smooth second smooth portion 10123 located between the third sawtooth portion 10121 and the fourth sawtooth portion 10122 and connecting the third sawtooth portion 10121 and the fourth sawtooth portion 10122.

[0038] The first sawtooth portion 10111 of the first light incident surface 1011 is connected to the third sawtooth portion 10121 of the second light incident surface 1012, so that the connection 1013 between the first light incident surface 1011 and the second light incident surface 1012 has a continuous sawtooth microstructure. In other embodiments, the connection 1013 between the first light incident surface 1011 and the second light incident surface 1012 may also be a smooth surface without a microstructure.

[0039] In this embodiment, the optical element 10 is made of the same material. In other embodiments, the optical element 10 may also be made of two materials with different light transmittances. For example, the connection 1013 of the first light incident surface 1011 and the second light incident surface 1012, and the connection 1023 of the first light emitting surface 1021 and the second light emitting surface 1022 are made of materials with relatively low light transmittance, so that the connection 1013 of the first light incident surface 1011 and the second light incident surface 1012, and the connection 1023 of the first light emitting surface 1021 and the second light emitting surface 1022 are located at the center of the optical element 10, and the light transmittance thereof is lower than the light transmittance of the two sides of the optical element 10. The low light transmittance at the center of the optical element 10 can further weaken the central light intensity, thereby making the light distribution more uniform.

[0040] This embodiment further provides a lighting device 1, comprising the above-mentioned optical element 10, a light source 30, and a housing 20 integrally formed with the optical element 10. The light source 30 is located in a containing space formed by the optical element 10 and the housing 20.

[0041] In this embodiment, the housing 20 is made of insulating material. In other embodiments, the housing 20 can also be made of metal material, so that the optical element 10 and the housing 20 are separately molded and then assembled.

[0042] An air groove 40 is provided between the light source 30 and the optical element 10. The light source 30 includes a light source board 302 and LED particles 301. The light source board 302 is connected to the bottom of the housing 20. The housing 20 has mounting grooves 201 on both sides, and the two sides of the light source board 302 are respectively located in the mounting grooves 201 so as to fix the light source board 302 in the housing 20. The LED particles 301 are arranged in a row. When the connection 1013 of the first light incident surface 1011 and the second light incident surface 1012 of the optical element 10 is projected onto the bottom surface 202 of the housing 20, the projection of the connection 1013 of the first light incident surface 1011 and the second light incident surface 1012 and the projection of the LED particles 301 at least partially overlap.

[0043] Please refer to Figure 3 As shown, an optical element 50 of the second preferred embodiment of the present invention is used to process the light emitted by the light source 60, including a light incident surface 501 and a light emitting surface 502, and the light emitting surface 502 includes a first curved surface 5021 and a second curved surface 5022 that are symmetrically arranged. The light incident surface 501 includes a first light incident surface 5011 and a second light incident surface 5012 that are symmetrically arranged. The first light incident surface 5011 and the second light incident surface 5012 have microstructures respectively, and a concave is formed at the connection 5023 of the first curved surface 5021 and the second curved surface 5022. When any straight line (not shown) is used to connect the light incident surface 501, the light emitting surface 502 and the light source 60, the difference between the distance from the light emitting surface 502 to the light source 60 and the distance from the light incident surface 502 to the light source on the straight line is less than 2 mm. A concave is also formed at the connection 5013 of the first light incident surface 5011 and the second light incident surface 5012. That is, the light incident surface 501 and the light emitting surface 502 are roughly parallel. In other embodiments, the connection 5013 between the first light incident surface 5011 and the second light incident surface 5012 may not form a recess.

[0044] In this embodiment, the distance between any point of the light incident surface 501 and the light source 60 is greater than 2 mm. In other embodiments, the distance between the light incident surface 501 and the light source 60 can also be adjusted as needed.

[0045] The first curved surface 5021 and the second curved surface 5022 are smooth surfaces. The microstructures of the first light incident surface 5011 and the second light incident surface 5012 are symmetrically distributed. The microstructure of the first light incident surface 5011 includes at least two groups of sawtooth structures (not numbered) with different densities. The connection 5013 between the first light incident surface 5011 and the second light incident surface 5012 is a smooth plane.

[0046] In this embodiment, the optical element 50 is made of two materials with different light transmittances. The connection 5013 of the first light incident surface 5011 and the second light incident surface 5012, and the connection 5023 of the first light emitting surface 5021 and the second light emitting surface 5022 are made of materials with relatively low light transmittance, so that the connection 5013 of the first light incident surface 5011 and the second light incident surface 5012, and the connection 5023 of the first light emitting surface 5021 and the second light emitting surface 5022 are located at the center of the optical element 50, and their light transmittances are lower than the light transmittances at both sides of the optical element 50. The low light transmittance at the center of the optical element 50 can further weaken the central light intensity, thereby making the light distribution more uniform.

[0047] This embodiment also provides a lighting device 8, comprising the above-mentioned optical element 50, a light source 60, and a housing 70 integrally formed with the optical element 50. The light source 60 is located in the accommodation space formed by the optical element 50 and the housing 70. A mounting groove 80 is provided at the connection between the optical element 50 and the housing 70. The light source 60 is installed in the mounting groove 80.

[0048] Two sides of the shell 70 have "X"-shaped fixing grooves 701 , and the fixing grooves 701 are recessed toward the inside of the shell 70 .

[0049] The light source 60 includes a light source plate 601 and LED particles 602. The LED particles 602 are arranged in rows. When the connection point 5013 between the first light incident surface 5011 and the second light incident surface 5012 of the optical element 50 and the LED particles 602 are projected onto the bottom surface of the shell 70, the projection of the connection point 5013 between the first light incident surface 5011 and the second light incident surface 5012 at least partially overlaps with the projection of the LED particles 602.

[0050] In this embodiment, the housing 70 is made of insulating material. In other embodiments, the housing 70 can also be made of metal material, so that the optical element 50 and the housing 70 are separately molded and then assembled.

[0051] An air groove 40 is formed between the light source 30 , the optical element 10 and the housing 20 .

[0052] It should be noted that the embodiments of the present invention have better practicability and do not impose any form of limitation on the present invention. Any technician familiar with the field may use the technical content disclosed above to change or modify it into an equivalent effective embodiment. However, any modification or equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An optical element for processing light emitted by a light source, comprising a light incident surface and a light emitting surface, the light emitting surface comprising a first curved surface and a second curved surface symmetrically arranged, the light incident surface comprising a first light incident surface and a second light incident surface symmetrically arranged, the first light incident surface and the second light incident surface respectively having microstructures, a depression being formed at the connection between the first curved surface and the second curved surface, and the light incident surface, the light emitting surface and the light source being connected by any straight line; the microstructure of the first light incident surface comprises a first serrated portion and a second serrated portion in a serrated shape, and a smooth first smooth portion being located between the first serrated portion and the second serrated portion and connecting the first serrated portion and the second serrated portion.

2. The optical element according to claim 1, wherein: The distance between any point of the light incident surface and the light source is greater than 2 mm.

3. The optical element according to claim 1, wherein: A depression is also formed at the connection between the first light incident surface and the second light incident surface.

4. The optical element according to claim 1, wherein: The first curved surface and the second curved surface are smooth surfaces.

5. The optical element according to claim 1, wherein: The microstructures of the first light incident surface and the second light incident surface are symmetrically distributed.

6. The optical element according to claim 1, wherein: The microstructure of the second light incident surface includes a third sawtooth portion and a fourth sawtooth portion in a sawtooth shape, and a smooth second smooth portion located between the third sawtooth portion and the fourth sawtooth portion and connecting the third sawtooth portion and the fourth sawtooth portion.

7. The optical element according to claim 6, wherein: The first serration of the first light incident surface is connected to the third serration of the second light incident surface, so that the connection between the first light incident surface and the second light incident surface has a continuous serration-shaped microstructure.

8. The optical element according to claim 1, wherein: The connection between the first light incident surface and the second light incident surface is a smooth surface.

9. The optical element according to claim 1, wherein: The optical element is made of two materials with different light transmittances. The connection between the first light incident surface and the second light incident surface and the connection between the first curved surface and the second curved surface are located at the center of the optical element, and their transmittances are lower than those at two sides of the optical element.

10. A lighting device, comprising the optical element according to any one of claims 1 to 9, a light source and a housing integrally formed with the optical element, wherein the light source is located in a containing space formed by the optical element and the housing.

11. The lighting device according to claim 10, characterized in that: The shell is made of insulating material.

12. The lighting device according to claim 10, characterized in that: An air groove is provided between the light source and the optical element. The light source comprises a light source plate and LED particles. The light source plate is connected to the bottom of the housing.

13. The lighting device according to claim 12, characterized in that: The shell has mounting grooves on both sides respectively, and the light source board is located in the mounting grooves on both sides respectively so as to fix the light source board in the shell.

14. The lighting device according to claim 10, characterized in that: An air groove is provided between the light source, the optical element and the housing.

15. The lighting device according to claim 14, characterized in that: A mounting groove is provided at the connection between the optical element and the housing, and the light source is mounted in the mounting groove.

16. The lighting device according to claim 14, characterized in that: Two sides of the shell are provided with "X"-shaped fixing grooves, and the fixing grooves are recessed toward the inside of the shell.

17. The lighting device according to claim 10, characterized in that: The light source includes a light source plate and LED particles, the LED particles are arranged in rows, and when the connection between the first light incident surface and the second light incident surface of the optical element and the LED particles are projected onto the bottom surface of the shell, the projection of the connection between the first light incident surface and the second light incident surface at least partially overlaps with the projection of the LED particles.

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