An optical structure using RGBW light source and COB light source

Abstract

The utility model discloses an optical structure of RGBW light source and COB light source, including: fixed bolster is equipped with the light transmission hole, RGBW light source spare, installs in fixed bolster one side, the light emitting part of RGBW light source spare stretches into the light transmission hole, fixed bolster is equipped with aspheric convex lens at the light transmission hole, the aspheric convex lens is convex to the direction away from RGBW light source spare, and is equipped with the light mixing microstructure on the aspheric convex lens, the light shield, installs fixed bolster and is away from the one side of RGBW light source spare, has the light inlet and the light outlet, the light inlet is used to receive the light from the light transmission hole and is shot into, total reflection lens, installs at the light outlet of light shield. The aspheric convex lens and light mixing microstructure can carry out the preliminary angle adjustment and the light ray fusion to the emergent light of RGBW light source spare, the light shield carries out the light ray again and fuses, expands the light emitting angle of red, blue chip light, makes it and green / white light's light field distribution tend to be consistent, finally total reflection lens carries out the light spot shaping in far field, solves the problem of uneven color mixing.

Description

Technical Field

[0001] This application relates to the field of lighting device technology, specifically to an optical structure that combines RGBW and COB light sources. Background Technology

[0002] RGBW (red, green, blue, white) four-color integrated light sources are widely used in various scenarios due to their core advantages such as wide color gamut coverage, high color rendering index, adjustable color temperature, and high brightness output. As the demand for miniaturization and high integration in end products continues to increase, RGBW light sources typically adopt a multi-chip tightly packaged design. By reducing the chip spacing, higher light density per unit area can be achieved to meet the technical requirements of small-size lighting or high-resolution displays.

[0003] However, when the chip spacing decreases and the aforementioned RGBW light sources are integrated on the substrate at close spacing and used in conjunction with a total internal reflection lens, the "surface light source focusing / uniform light" characteristics of the total internal reflection lens result in different refractive efficiencies for light of different angles and wavelengths. This leads to obvious color shifts in the edge areas of the emitted light spot from the total internal reflection lens (such as reddish corners and bluish edges), while the central area appears whitish or greenish due to the excessive proportion of green and white light, forming a "center-edge" color temperature gradient. Furthermore, as the chip spacing decreases, this uneven color mixing phenomenon intensifies exponentially.

[0004] Therefore, in practical applications, due to the continuous improvement in the requirements for light source resolution and light density, the spacing between RGBW chips has been continuously reduced, which has become a key technical pain point that causes uneven color mixing and restricts the improvement of light efficiency. Utility Model Content

[0005] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, this utility model proposes: An optical structure that combines RGBW and COB light sources includes: The fixed bracket is equipped with light-transmitting holes; An RGBW light source is mounted on one side of the fixed bracket. The light-emitting part of the RGBW light source extends into the light-transmitting hole. The fixed bracket is provided with an aspherical convex lens at the light-transmitting hole. The aspherical convex lens protrudes in a direction away from the RGBW light source and is provided with a light-mixing microstructure. The reflector, mounted on a bracket on the side opposite to the RGBW light source, has a light inlet and a light outlet, the light inlet being used to receive light entering from the light-transmitting hole; A total internal reflection lens is installed at the light outlet of the reflector.

[0006] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: the light mixing microstructure is a Fermat spiral microlens array.

[0007] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: the fixed bracket is made of light-transmitting material.

[0008] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: the fixed bracket and the aspherical convex lens are integrally formed.

[0009] The technical solution adopted by one embodiment of this utility model to solve its technical problem is as follows: the total internal reflection lens has an incident light surface and an exit light surface. The side of the total internal reflection lens near the aspherical convex lens extends to the side near the fixed bracket. The side of the total internal reflection lens near the aspherical convex lens is provided with a receiving hole. The aspherical convex lens extends into the receiving hole. The hole wall of the receiving hole constitutes the incident light surface. The side of the COB away from the receiving hole is the exit light surface.

[0010] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: the bottom surface of the receiving hole is a convex arc surface.

[0011] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: the cross-sectional area of ​​the receiving hole gradually decreases from one end near the aspherical convex lens to the other end.

[0012] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: the light-emitting surface is provided with a non-spherical convex surface structure and a concave arc surface structure surrounding the non-spherical convex surface structure, and microlens structures are respectively provided on the non-spherical convex surface structure and the concave arc surface structure.

[0013] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: the microlens structure on the aspherical convex surface structure is a Fermat spiral microlens structure, and the microlens structure on the concave arc surface structure is a rectangular microlens structure.

[0014] The beneficial effects of this invention are as follows: The aspherical convex lens and the light-mixing microstructure can perform preliminary angle adjustment of the emitted light from the RGBW light source, especially for red and blue chips. The aspherical convex lens, through its curved surface design, can precisely control the light path. The light-mixing microstructure, in conjunction with near-field scattering or refraction of light, expands the emission angle of the red and blue chip light, thereby achieving preliminary light mixing in the near field. The reflector further fuses the light, expanding the emission angle of the red and blue chip light and making it more consistent with the light field distribution of green / white light, laying the foundation for subsequent light mixing. Finally, the total internal reflection lens performs spot shaping in the far field, solving the problem of uneven color mixing caused by the direct entry of the RGBW light source into the total internal reflection lens in traditional solutions.

[0015] This application reduces component costs by integrating an aspherical convex lens onto a fixed bracket. It eliminates the need to change the connection structure between the total internal reflection lens, the reflector, and the fixed bracket. Simply adding an aspherical convex lens to the fixed bracket allows for the use of both RGBW and other light sources. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a structural diagram of the optical structure that combines RGBW and COB light sources as described in this embodiment; Figure 2 This is a structural explosion of the optical structure that combines RGBW and COB light sources as described in this embodiment. Figure 1 ; Figure 3 This is a structural explosion of the optical structure that combines RGBW and COB light sources as described in this embodiment. Figure 2 ; Figure 4 This is a cross-sectional view of the optical structure that combines RGBW and COB light sources as described in this embodiment. Detailed Implementation

[0017] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0018] In the description of this utility model, "multiple" means two or more; "greater than," "less than," and "exceeding" are understood to exclude the stated number; "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or their sequential relationship.

[0019] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] In this utility model, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0021] Reference Figure 1-4 This application proposes an embodiment of an optical structure that combines RGBW and COB light sources, comprising: The fixed bracket 10 is provided with a light-transmitting hole 11; An RGBW light source 20 is mounted on one side of the fixed bracket 10. The light-emitting part 21 of the RGBW light source 20 extends into the light-transmitting hole 11. The fixed bracket 10 is provided with an aspherical convex lens 30 at the light-transmitting hole 11. The aspherical convex lens 30 protrudes in a direction away from the RGBW light source 20, and a light-mixing microstructure 60 is provided on the aspherical convex lens 30. The reflector 40 and the mounting bracket 10 are located on the side opposite to the RGBW light source 20. The reflector 40 has a light inlet and a light outlet. The light inlet is used to receive light rays that enter from the light-transmitting hole 11. The total internal reflection lens 50 is installed at the light outlet of the reflector 40.

[0022] The aspherical convex lens 30 and the light-mixing microstructure 60 can perform preliminary angle adjustment of the emitted light from the RGBW light source 20. Especially for red and blue chips, the aspherical convex lens 30, through its curved surface design, can precisely control the light path. The light-mixing microstructure 60, in conjunction with the near field, scatters or refracts the light, expanding the emission angle of the red and blue chip light, thereby achieving preliminary angle adjustment and light fusion in the near field. The reflector 40 further fuses the light, making its light field distribution more consistent with that of green / white light, laying the foundation for subsequent light mixing. Finally, the total internal reflection lens 50 performs spot shaping in the far field, solving the problem of uneven color mixing caused by the chip light directly entering the total internal reflection lens 50 in traditional solutions.

[0023] This application reduces component costs by integrating an aspherical convex lens 30 onto the fixed bracket 10. It eliminates the need to change the connection structure between the total reflection lens 50, the reflector 40, and the fixed bracket 10. Simply adding an aspherical convex lens 30 to the fixed bracket 10 allows it to be used with an RGBW light source.

[0024] Furthermore, the light-mixing microstructure 60 is a Fermat spiral microlens array.

[0025] The Fermat spiral microlens array uses a spiral with a continuously varying curvature to refract incident light at different angles. This allows light rays at different incident angles to be refracted and deflected by spiral units at different positions, eliminating the risk of color distortion at the edges.

[0026] In this embodiment, the fixing bracket 10 is made of a light-transmitting material.

[0027] The base is made of a light-transmitting material, so that when the RGBW light source 20 is lit, the light emitted from the side can be emitted from the base for illumination, reducing light loss and giving the base a luminous effect, thus enhancing its aesthetic appeal.

[0028] Based on the above, specifically, the fixed bracket 10 and the aspherical convex lens 30 are integrally formed.

[0029] In this embodiment, the fixing bracket 10 and the aspherical convex lens 30 are integrally formed, which facilitates manufacturing.

[0030] Preferably, the total internal reflection lens 50 has an incident light surface and an exit light surface. The total internal reflection lens 50 extends from the side near the aspherical convex lens 30 to the side near the fixed bracket 10. The total internal reflection lens 50 has a receiving hole 51 on the side near the aspherical convex lens 30. The aspherical convex lens 30 extends into the receiving hole 51. The hole wall of the receiving hole 51 constitutes the incident light surface. The side of the COB away from the receiving hole 51 is the exit light surface.

[0031] The aspherical convex lens 30 extends into the receiving hole 51, covering the omnidirectional light output angle of the aspherical convex lens 30 and improving the overall light reception rate.

[0032] Preferably, the bottom surface of the receiving hole 51 is a convex arc surface. In the light emitted from the aspherical convex lens 30, the light propagation direction in the central region is close to perpendicular. If the bottom surface of the receiving hole 51 is flat, the phenomenon of excessively high local light intensity in the center is likely to occur. The convex arc surface design causes the central light rays to be refracted towards the edge region when they are incident on the convex arc surface, so that the light rays originally concentrated in the center are evenly dispersed to the entire incident surface of the total internal reflection lens, eliminating the uneven brightness of the light spot caused by the "central highlight".

[0033] Furthermore, the cross-sectional area of ​​the receiving aperture 51 gradually decreases from one end near the aspherical convex lens 30 to the other end. This serves to converge edge rays while the convex arc surface diverges central rays, and the combination of these two factors ensures uniform light intensity distribution on the incident surface of the total internal reflection lens.

[0034] Preferably, the light-emitting surface is provided with a non-spherical convex surface structure 52 and a concave arc surface structure 53 surrounding the non-spherical convex surface structure 52, and microlens structures 70 are respectively provided on the non-spherical convex surface structure 52 and the concave arc surface structure 53.

[0035] The aspherical convex structure 52 mainly receives and outputs light from the central area of ​​the RGBW light source 20. The light-focusing effect of the aspherical convex surface can accurately converge this light to the central area. The concave arc surface structure 53 mainly receives and outputs light from the edge area of ​​the RGBW light source 20. The light-diffusing characteristic of the concave arc surface can evenly diffuse this light to the edge area, increasing the diameter of the light spot while ensuring the brightness of the center. The microlens structure 70 improves the color mixing effect and enhances the uniformity of the light spot.

[0036] Specifically, the microlens structure 70 on the aspherical convex structure 52 is a Fermat spiral microlens structure 70, and the microlens structure 70 on the concave arc structure 53 is a rectangular microlens structure 70.

[0037] Of course, this utility model is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of this utility model. All such equivalent modifications and substitutions are included within the scope defined by the claims of this application.

Claims

1. An optical structure that combines RGBW and COB light sources, characterized in that, include: The fixed bracket (10) is provided with a light-transmitting hole (11); An RGBW light source (20) is installed on one side of the fixed bracket (10). The light-emitting part of the RGBW light source (20) extends into the light-transmitting hole (11). The fixed bracket (10) is provided with an aspherical convex lens (30) at the light-transmitting hole (11). The aspherical convex lens (30) protrudes in a direction away from the RGBW light source (20), and a light-mixing microstructure (60) is provided on the aspherical convex lens (30). The reflector (40) and the mounting bracket (10) are located on the side opposite to the RGBW light source (20), and have a light inlet and a light outlet. The light inlet is used to receive light rays that enter from the light-transmitting hole (11). A total reflection lens (50) is installed at the light outlet of the reflector (40).

2. The optical structure combining RGBW and COB light sources according to claim 1, characterized in that, The light-mixing microstructure (60) is a Fermat spiral microlens array.

3. The optical structure combining RGBW and COB light sources according to claim 1, characterized in that, The fixed bracket (10) is made of light-transmitting material.

4. The optical structure combining RGBW and COB light sources according to claim 3, characterized in that, The fixed bracket (10) and the aspherical convex lens (30) are integrally formed.

5. The optical structure combining RGBW and COB light sources according to claim 1, characterized in that, The total internal reflection lens (50) has an incident light surface and an exit light surface. The total internal reflection lens (50) extends from the side near the aspherical convex lens (30) to the side near the fixed bracket (10). The side of the total internal reflection lens (50) near the aspherical convex lens (30) is provided with a receiving hole (51). The aspherical convex lens (30) extends into the receiving hole (51). The hole wall of the receiving hole (51) constitutes the incident light surface. The side of the total internal reflection lens away from the receiving hole (51) is the exit light surface.

6. The optical structure combining RGBW and COB light sources according to claim 5, characterized in that, The bottom surface of the receiving hole (51) is a convex arc surface.

7. The optical structure combining RGBW and COB light sources according to claim 6, characterized in that, The cross-sectional area of ​​the receiving hole (51) gradually decreases from one end near the aspherical convex lens (30) to the other end.

8. The optical structure combining RGBW and COB light sources according to claim 5, characterized in that, The light-emitting surface is provided with a non-spherical convex surface structure (52) and a concave arc surface structure (53) surrounding the non-spherical convex surface structure (52). Both the non-spherical convex surface structure (52) and the concave arc surface structure (53) are provided with microlens structures (70).

9. The optical structure combining RGBW and COB light sources according to claim 8, characterized in that, The microlens structure (70) on the aspherical convex structure (52) is a Fermat spiral microlens structure, and the microlens structure (70) on the concave arc structure (53) is a rectangular microlens structure.

Images