A component for flat light guide atmosphere light color quality test

Abstract

The application discloses a component for testing color quality of a flat light guide atmosphere lamp, which comprises a shell, a lens and a light guide plate arranged in the shell, a containing groove is formed in the lower end surface of the shell and used for placing a PCB surface of a flat atmosphere lamp light source module to be detected, a cavity is formed downward in the upper end surface of the shell and communicates with the containing groove, the light guide plate is arranged above the PCB surface and below the cavity and is used for sending light on the PCB surface into the cavity, and the lens is arranged in the cavity and used for receiving the light gathered by the light guide plate and emitting the light from the top end of the cavity to enter an external optical analysis equipment. The application can achieve good collection effect, has more accurate and closer use mode of color spectrum of a real vehicle atmosphere lamp, reduces exposure time of the optical equipment compared with a collection structure based on a traditional reflection principle, and realizes high-speed rhythm test.

Description

Technical Field

[0001] This invention belongs to the field of light detection, and in particular relates to a component for testing the color quality of ambient light in a planar light guide. Background Technology

[0002] With the development of new energy vehicles, various ambient lighting applications have emerged in their internal and external structures. However, LED production processes and batches result in different RGB ambient light colors, affecting customer experience. Therefore, it is necessary to collect light color parameters before the RGB ambient light module is put into production.

[0003] After the automotive interior ambient lighting module is installed, its effect, as perceived by the human eye, falls into three main categories: point-like, line-like, or surface-like. The experimental principle is as follows: light emitted directly from the light source passes through different structures. Direct illumination results in point-like effects; indirect illumination, where the light source passes through a strip-shaped toothed structure, causes the light to be reflected onto materials such as plastic and leather, forming point-like and line-like effects; and in indirect illumination, where the light source passes through a planar light guide structure with a hollowed-out design that complements the surrounding trim, it can produce point-like, line-like, or surface-like effects. All three effects can be achieved using a planar light guide structure, offering flexibility and versatility. Because the methods of achieving these effects differ, it is difficult to standardize the testing methods for ambient lighting.

[0004] Because the LEDs on the planar light guide of the PCBA module emit light from the side with the emitting surface perpendicular to the PCB board, the testing difficulty of the planar light guide surface ambient lighting assembly is increased. Since the human eye has a strong visual response to planar ambient lighting deployed inside and outside vehicles, the perception of color and brightness is more pronounced. Therefore, component manufacturers have an urgent need for quality control of planar light guide surface ambient lighting.

[0005] In existing technologies, small-diameter aluminum alloy spherical shells are often used for internal spraying, with an integrating sphere serving as the data acquisition component for testing. Most existing ambient lights have their emitting surface parallel to the PCB board. The data acquisition component, such as the integrating sphere, only needs a small cutout to cover the emitting surface to collect light color parameters. While the cutout is small, the overall volume is enormous. When measuring side-emitting structures, this method suffers from significant drawbacks. Since the emitting surface of a planar light-guided ambient light is perpendicular to the PCB board, and to achieve a large-area display, the LED light source is side-emitting, using SMT (Surface Mount Technology) with the PCB in a linear arrangement. If a cutout is still used, the sphere diameter, to achieve good integration characteristics, may exceed 1 meter, making it unsuitable for production line equipment. An excessively large cavity results in very low energy acquisition and affects the production testing cycle. Even using an integrated light guide rod with a mini integrating sphere for testing, side-emitting light cannot provide adequate acquisition space. Therefore, a change in approach is necessary, changing the emitting surface to be parallel to the PCB. Summary of the Invention

[0006] The technical objective of this invention is to provide a component for testing the color quality of planar light guide ambient light, thereby solving the technical problems in the prior art.

[0007] To solve the above problems, the technical solution of the present invention is as follows:

[0008] A component for testing the color quality of ambient lighting in a planar light guide, comprising:

[0009] The housing, and the lens and light guide plate disposed within the housing;

[0010] A receiving groove is provided on the lower end face of the housing for placing the PCB board of the planar ambient light source module to be tested; a cavity is provided on the upper end face of the housing, and the cavity is connected to the receiving groove.

[0011] The light guide plate is laid on the top of the PCB board and below the cavity to send the light from the PCB board into the cavity.

[0012] The lens is installed inside the cavity to receive the light that has been focused by the light guide plate and then emitted from the top of the cavity to enter the external optical analysis equipment.

[0013] Specifically, the cavity includes a first cavity and a second cavity;

[0014] The first cavity is located above the second cavity, and the radial length of the first cavity is less than the radial length of the second cavity;

[0015] The first cavity is used as a fiber optic socket for optical path connection with external optical analysis equipment;

[0016] The second cavity is used to mount the lens.

[0017] The lens is a Fresnel lens, made of PMMA or optical glass;

[0018] The focal length and convex lens shape can be changed according to actual usage requirements.

[0019] Specifically, the casing has a matte black finish;

[0020] The cavity below the lens has a threaded structure on its peripheral wall to eliminate unwanted stray light; the threads include circular trapezoidal step textures, grid-like step textures, and square-shaped step textures.

[0021] More preferably, a pressure ring is also provided, which is used to install and fix the lens, and is snap-fitted and bolted to the lens; the pressure ring is clearance-fitted with the peripheral wall of the second cavity and fixed in the second cavity.

[0022] The light guide plate is rectangular in shape.

[0023] Its sides are light-inlet surfaces with several light-inlet areas; its top surface is a light-outlet surface with several light-outlet areas.

[0024] The light guide plate has a reflective structure obtained by laser dotting or screen printing, which is used to improve the light reflection efficiency.

[0025] More preferably, a reflective film is also provided, which is attached to the periphery of the light guide plate and extends to the portion of the light-inlet surface where no light-inlet area is provided, and the portion of the light-outlet surface where no light-outlet area is provided.

[0026] Among them, the lower end face of the light guide plate is also provided with several black matte parts, which divide the light guide plate into several long strips of plates, and the number of long strips of plates corresponds to the number of analysis pixels;

[0027] The area on the lower end surface without the black matte finish is the light-receiving area and has a reflective structure.

[0028] More preferably, a diffusion film is also provided, which is located above the light guide plate and is used to scatter the light passing through the light guide plate to the lens;

[0029] The diffusion film has a haze of over 90% and a diffuse transmittance of 90%, and the substrates include PET and PC.

[0030] More preferably, a fixing ring is also provided, which is fitted onto the upper end face of the light guide plate, and the fixing ring is used to limit the position of the diffusion film.

[0031] Because the present invention adopts the above technical solution, it has the following advantages and positive effects compared with the prior art:

[0032] 1. The light guide plate of the present invention can pass most of the incident light through the laser dotting and reflective film structure, and after refraction and reflection, it is uniformly diffused by the diffusion film. It can be understood as a collection of multiple Lambertian light sources, in which parallel light rays are focused by the lens to the optical fiber entrance and transferred to the analysis equipment.

[0033] 2. When using this invention, the light-emitting surface is effectively transformed into a state parallel to the PCB, which can be used to test onboard side-lit LED planar light guide ambient light PCBA.

[0034] 3. This invention can be quickly adapted to different products by changing the light guide plate and Fresnel lens, thus meeting the changing needs of car manufacturers;

[0035] 4. This invention utilizes a Fresnel lens, resulting in high integration, small size, and low manufacturing cost;

[0036] 5. The invention is small in size and can be used for array testing of densely packed module PCBAs, thus speeding up the testing cycle. Attached Figure Description

[0037] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention.

[0038] Figure 1 This is an exploded view of the component of the present invention used for testing the color quality of ambient light from a planar light guide;

[0039] Figure 2 This is a cross-sectional view of the main body of the component for testing the color quality of planar light guide ambient light according to the present invention;

[0040] Figure 3 This is a schematic diagram of light mixing during the testing of this invention.

[0041] Explanation of reference numerals in the attached figures

[0042] 1: PCB board surface; 2: Fixing plate; 3: Reflective film; 4: Light guide plate; 5: Fixing ring; 6: Diffuser film; 7: Pressure ring; 8: Lens; 9: Housing; 10: SMA905 mounting base; 11: SMA905 optical fiber. Detailed Implementation

[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0044] To keep the drawings concise, only the parts relevant to the invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of components with the same structure or function is shown schematically, or only one is labeled. In this document, "one" can mean not only "only one" but also "more than one".

[0045] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a component for testing the color quality of planar light guide ambient lighting according to the present invention. The advantages and features of the present invention will become clearer from the following description and claims.

[0046] Example

[0047] See Figures 1 to 3This embodiment provides a component for testing the color quality of planar light guide ambient lights. It can simulate side-lit LED illumination with a small size and achieve accurate testing. It features a reasonable optical structure and improves acquisition efficiency through simple optical principles. Due to its small size, it can be combined with arrays for installation, increasing the testing cycle time. This embodiment can change the current situation of high cost or large size in testing side-lit planar light guide ambient light modules using integrating spheres. When used with an array, it can greatly improve the testing cycle time.

[0048] See Figure 1 and Figure 2 The main body of this embodiment is a housing 9, which has a matte black finish. A receiving groove is formed on the lower end face of the housing 9, with an opening on one side for placing the PCB board surface 1 of the planar ambient light source module to be tested. The user can move the PCB board surface 1 into this embodiment through the side opening for testing. A cavity is formed downwards on the upper end face of the housing 9, and the cavity communicates with the receiving groove below. The cavity can be artificially divided into a first cavity and a second cavity according to its radial length. The first cavity is located above the second cavity, and the radial length of the first cavity is less than the radial length of the second cavity. Figure 2 It is known that the axial length of the first cavity is much smaller than that of the second cavity. This arrangement is related to the functions of the first and second cavities: the first cavity serves as the connection part of the fiber optic socket to connect with the optical path of external optical analysis equipment, while the second cavity is used to install the lens 8.

[0049] See Figure 1 and Figure 2 In this embodiment, the housing 9 contains a lens 8 and a light guide plate 4. The lens 8 is a Fresnel lens made of PMMA with a 10mm focal length and extremely high transmittance; however, it can also be made of optical glass. Different lenses can be used depending on the required focal length. These lenses can be convex (spherical) or aspherical (aspherical), and the appropriate lens is selected based on the application scenario. To secure and install the lens 8, this embodiment also includes a retaining ring 7. The retaining ring 7 is used to install and fix the lens 8. Since Fresnel lenses have different surface shapes, the lens 8 and retaining ring 7 are connected by a snap-fit ​​and screws. After fixing, the retaining ring 7 is fitted with the peripheral wall of the second cavity with a clearance fit or a threaded fit, fixing it in the middle position of the second cavity. The peripheral wall of the cavity below the lens 8 mounting position has a threaded structure to eliminate ineffective stray light. The threads include, but are not limited to, circular trapezoidal step textures, grid-like step textures, and U-shaped step textures.

[0050] See Figure 1 and Figure 2 Next, the light guide plate 4 will be described in detail. The light guide plate 4 is laid on top of the PCB board surface 1 and located below the cavity. Figure 2 It can be observed that a space is provided inside the housing 9 for placing the light guide plate 4, which is fixed by a fixing plate 2 connected to it. The light guide plate 4 sends the light from the PCB board surface 1 into the cavity. Then, because the lens 8 is installed in the cavity, the light received by the light guide plate 4 is focused and emitted from the top of the cavity, which can directly enter the external optical analysis equipment. The light guide plate 4 is generally rectangular, with its sides being light-incoming surfaces with several light-incoming areas; its top surface is the light-outcoming surface with several light-outcoming areas. The light-incoming surfaces have reflective structures obtained by laser dotting or screen printing.

[0051] To further prevent light loss, a highly reflective reflective film 3 is also provided. The reflective film is attached to the periphery of the light guide plate 4. The reflective film 3 can reduce the amount of light refracted out from inside the light guide plate 4, thereby increasing the amount of light entering the cavity. The reflective film 3 can also be extended to the part of the light-inlet surface where no light-inlet area is set, and the part of the light-outlet surface where no light-outlet area is set. The reflective film 3 can be attached to any place where it does not affect the light inlet and outlet.

[0052] For a better option, see Figure 1 and Figure 2 It also includes a diffusion film 6, located above the light guide plate 4, used to scatter the light passing through the light guide plate 4 to the lens 8; wherein, the diffusion film 6 has optical properties of more than 90% haze and 90% diffuse transmittance, and the substrate includes materials such as PET and PC. By providing a fixing ring 5, it is attached to the upper end surface of the light guide plate 4, and the fixing ring 5 can limit the position of the diffusion film 6.

[0053] See Figure 3 When the pixels of the planar ambient light source module are independent, the light guide plate 4 can be separated using a matte black material, dividing it into multiple long strips corresponding to the number of analyzed pixels, such as... Figure 3 The bottom is divided as shown. The unobstructed area on the bottom is the light-receiving area, which is equipped with a reflective structure and a reflective film 3 is attached around it. The upper surface is equipped with a separate diffuser, lens 8, and fiber optic acquisition structure. It is packaged as an independent unit. The light guide plate 4, reflective film 3, and diffuser film 6 are three components used to simulate the diffused and uniform light materials in the planar light guide ambient light of a real vehicle.

[0054] In actual use, an SMA905 mounting base 10 is set in the first cavity. The SMA905 mounting base 10 is connected to an SMA905 optical fiber 11. A 1m optical fiber with a core diameter of 600um quartz material is used. When used with a 25um grating spectrometer, for the Nichia NSSM313AT model tri-color LED light source, the RGB three colors can be tested to 75% saturation in 30ms. The lens 8 is positioned with the SMA905 optical fiber 11. After the light passes through the PCB board surface 1 of the planar ambient light source module, it enters the light guide plate 4. After refraction and reflection inside the reflective film 3, the light is emitted from the diffuser film 6 to the lens 88. After some of the light converges, the light focal point falls on the end face of the SMA905 optical fiber 11.

[0055] When using this embodiment, as follows: Figure 3 The light received from the side-entered LED on the PCB board 1 of the planar ambient light source module is reflected by the light guide plate 4, with the light path being a; it is uniformly diffused by the diffuser film 6, with the light path being b; it is converged by the Fresnel lens, with the light path being c, and then emitted to the end face of the SMA905 optical fiber 11, with the light path being d.

[0056] In this embodiment, when the side-lit LEDs (RGB three-in-one) on the PCB board 1 of the planar ambient light source module are all independent pixels, the internal structure of the housing 9 can be changed. For the internal components, multiple paths are separated, and a matte black material is used to encapsulate the light guide plate 4, reflective film 3, diffuser film 6, lens 8, and fiber optic acquisition structure as independent units, and arrange them in an array for acquisition; the same array can be used for other components.

[0057] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they shall still fall within the protection scope of the present invention.

Claims

1. A component for testing the color quality of planar light guide ambient light, characterized in that, include: A housing, and a lens and a light guide plate disposed within the housing; The lower end face of the housing has a receiving groove for placing the PCB board of the planar ambient light source module to be tested; the upper end face of the housing has a cavity that communicates with the receiving groove. The light guide plate is laid on the top of the PCB board and located below the cavity, and is used to send the light from the PCB board into the cavity; The lens is installed inside the cavity to receive the light that has been focused by the light guide plate and then emitted from the top of the cavity to enter the external optical analysis equipment. The light guide plate is rectangular, with its sides serving as light-inlet surfaces and having several light-inlet areas; the top surface serves as a light-outlet surface and has several light-outlet areas. The light guide plate has a reflective structure obtained by laser dotting or screen printing, which is used to improve the light reflection efficiency; It also includes a reflective film, which is attached to the periphery of the light guide plate and extends to the portion of the light-inlet surface where no light-inlet area is provided, and the portion of the light-outlet surface where no light-outlet area is provided; A diffusion film is also provided, which is located above the light guide plate; The lower end face of the light guide plate is also provided with several matte black parts, which divide the light guide plate into several long strips of material, and the number of long strips of material corresponds to the number of analysis pixels. The light guide plate, the reflective film, the diffusion film, the lens, and the optical analysis equipment are packaged as independent units using a black matte material and arranged in an array for data acquisition.

2. The component for testing the color quality of planar light guide ambient light according to claim 1, characterized in that, The cavity includes a first cavity and a second cavity; The first cavity is located above the second cavity, and the radial length of the first cavity is less than the radial length of the second cavity; The first cavity is used as an optical fiber socket for optical path connection with external optical analysis equipment; The second cavity is used to mount the lens.

3. The component for testing the color quality of planar light guide ambient light according to claim 1, characterized in that, The lens is a Fresnel lens, made of PMMA or optical glass; The focal length and convex lens shape of the lens can be changed according to actual usage requirements.

4. The component for testing the color quality of planar light guide ambient light according to claim 3, characterized in that, The casing has a matte black finish. The periphery of the cavity located below the lens has a threaded structure to eliminate ineffective stray light; wherein the thread includes a circular trapezoidal step texture, a grid step texture, and a square step texture.

5. The component for testing the color quality of planar light guide ambient light according to claim 2, characterized in that, A pressure ring is also provided, which is used to install and fix the lens, and is snap-fitted and bolted to the lens; the pressure ring is clearance-fitted with the peripheral wall of the second cavity and fixed in the second cavity.

6. The component for testing the color quality of planar light guide ambient light according to claim 1, characterized in that, The area on the lower end face of the light guide plate where no black matte component is provided is the light-entry area, and a reflective structure is provided there.

7. The component for testing the color quality of planar light guide ambient light according to claim 1, characterized in that, The diffusion film is used to scatter the light passing through the light guide plate to the lens; The diffusion film has a haze of over 90% and a diffuse transmittance of 90%, and the substrate includes PET and PC.

8. The component for testing the color quality of planar light guide ambient light according to claim 7, characterized in that, A fixing ring is also provided, which is fitted to the upper end face of the light guide plate. The fixing ring is used to limit the position of the diffusion film.

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