Dodging device and manufacturing method thereof

Abstract

The invention discloses a dodging device which comprises a substrate layer, a first dodging layer and a second dodging layer, the substrate layer is located between the first dodging layer and the second dodging layer, the first dodging layer is arranged on the surface of one side of the substrate layer, and the second dodging layer is arranged on the surface of the other side of the substrate layer. According to the dodging device, the characteristic microstructure is formed on the surface of the glass substrate, the imaging quality can be improved, and meanwhile, the glass-based dodging device is stable in performance, is hardly influenced by environmental factors such as temperature, and is long in service life. The invention further discloses a manufacturing method of the dodging device.

Description

Technical Field

[0001] The present invention belongs to the technical field of imaging equipment, and in particular, relates to a light homogenizing device and a manufacturing method thereof. Background Art

[0002] With the development of 3D sensing (gesture recognition / face recognition / TOF), lidar, automotive head-up display HUD, display backlight and other fields, homogenizing devices are widely used in various industries.

[0003] Existing light homogenizing devices are often set as a single-sided periodic microlens array structure. Based on this structure, the light homogenizing device will cause light and dark stripes due to the diffraction of light, which will affect the imaging effect of the terminal device. Secondly, the existing light homogenizing devices are mostly implemented by nanoimprinting, injection molding, mechanical processing and other technologies. The implementation methods of nanoimprinting and injection molding are based on template processing. The processing of the template generally adopts lathe processing, laser direct writing and electron beam etching. Due to the limitations of the development of the above processing methods, there are certain gaps between individual microlenses, which leads to poor imaging quality problems such as graininess and rough picture. In addition, the development cycle of the above implementation method is long and the cost is high. Finally, the existing light homogenizing devices mainly use plastic substrates (PMMA / PC). This type of material has environmental reliability defects. Long-term use will cause problems such as yellowing and warping, which will affect the imaging quality.

[0004] It is hoped to provide an improved light homogenization device, particularly with regard to how to improve imaging quality. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a light homogenizing device, the purpose of which is to improve imaging quality.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a light homogenizing device includes a base layer, a first light homogenizing layer and a second light homogenizing layer, the base layer is located between the first light homogenizing layer and the second light homogenizing layer, the first light homogenizing layer is arranged on one side surface of the base layer, and the second light homogenizing layer is arranged on the other side surface of the base layer.

[0007] The base layer is made of glass, and has a thickness of 0.1-0.5 mm.

[0008] The refractive index of the base layer is 1.4 to 2.2.

[0009] The first light homogenizing layer is a concave quadrilateral microlens array, the quadrilateral includes a rectangle and a square, and the sizes and sags of the concave quadrilateral microlenses are the same or different.

[0010] The length of the long side of the quadrilateral is 20-300um, and the radius of curvature of the long side is 30-150um. The length of the short side of the quadrilateral is 10-150um, and the radius of curvature of the short side is 20-150um.

[0011] The second light homogenizing layer is a concave quadrilateral microlens array, a concave compound eye microlens array or a concave cylindrical microlens array.

[0012] The lenses of the concave compound eye microlens array are spherical or ellipsoidal, with a pitch of 500-1500um and a curvature radius of 10-100um; the surface roughness Ra of the concave compound eye microlens array is 100-500nm, and the PV value is 0.5-2um.

[0013] The concave compound-eye microlens array is arranged orthogonally.

[0014] The top view of the concave cylindrical microlens array is a closely connected rectangle, with a pitch of 200 to 1000 um and a curvature radius of 10 to 50 um.

[0015] The present invention also provides a method for manufacturing a light homogenizing device, comprising the steps of:

[0016] S1. Providing a base layer, a first light-dotting layer, and a second light-dotting layer;

[0017] S2. Assemble the base layer, the first light dodging layer, and the second light dodging layer. The first light dodging layer is installed on one side surface of the base layer, and the second light dodging layer is installed on the other side surface of the base layer.

[0018] The light homogenizing device of the present invention forms a characteristic microstructure on the surface of the glass substrate, which can improve the imaging quality. At the same time, the glass-based light homogenizing device has stable performance, is almost not affected by environmental factors such as temperature, and has a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] This specification includes the following drawings, which show the following contents:

[0020] Figure 1 1 is a schematic diagram of the structure of a light homogenizing device;

[0021] Figure 2 is a schematic diagram of a concave quadrilateral microlens array;

[0022] Figure 3 is a schematic diagram of a concave compound eye microlens array;

[0023] Figure 4 is a schematic diagram of a concave cylindrical microlens array;

[0024] Figure 5 is a simulated diagram of the diffusion angle;

[0025] The markings in the figure are: 1, base layer; 2, first uniform light layer; 3, second uniform light layer. DETAILED DESCRIPTION

[0026] The specific implementation methods of the present invention are further explained in detail below by describing the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solution of the present invention and facilitating its implementation.

[0027] It should be noted that, in the following embodiments, the “first” and “second” mentioned do not represent an absolute distinction in structure and / or function, nor do they represent a sequential order of execution, but are merely for the convenience of description.

[0028] like Figure 1 As shown, the present invention provides a light homogenizing device, including a base layer 1, a first light homogenizing layer 2 and a second light homogenizing layer 3, the base layer 1 is located between the first light homogenizing layer 2 and the second light homogenizing layer 3, the first light homogenizing layer 2 is arranged on one side surface of the base layer 1, and the second light homogenizing layer 3 is arranged on the other side surface of the base layer 1.

[0029] Specifically, in the embodiment of the present invention, the double-sided microstructure light homogenizing device can solve the problems of poor light homogenizing effect, low brightness, imaging graininess, light and dark stripes, small field of view and other poor imaging quality in the prior art.

[0030] In the embodiment of the present invention, the base layer 1 of the light homogenizer is glass, and its material includes but is not limited to soda-lime glass, aluminosilicate glass, quartz glass, high silica glass, and chalcogenide glass. The refractive index of the base layer 1 material is 1.4 to 2.2. The glass-based light homogenizer is not affected by environmental factors such as temperature and has good environmental reliability. In addition, glass materials with different refractive indices can adjust the diffusion angle of the light homogenizer.

[0031] In the embodiment of the present invention, the thickness of the base layer 1 is 0.1-0.5 mm, which can reduce the volume of the optical device and dissipate heat quickly, thereby extending the service life of the optical device.

[0032] In an embodiment of the present invention, the base layer 1 is a glass substrate that has been subjected to thinning, cutting, CNC processing, and chemical strengthening treatment in sequence. Thinning is the process of reducing the thickness of the original glass material to the required specifications. This step is usually achieved by methods such as mechanical grinding or chemical etching. The thinned glass substrate is lighter and thinner, which is conducive to subsequent processing and product lightweighting, and also helps to improve the light transmittance and sensitivity of the product. Cutting is the process of cutting the thinned glass substrate into a predetermined shape and size. CNC processing is the process of fine processing the glass substrate using computer numerical control technology. Chemical strengthening treatment is to immerse the glass substrate in a specific chemical solution to form a compressive stress layer on the glass surface, thereby improving the impact strength and scratch resistance of the glass. This treatment method can make the glass substrate more durable and extend the service life of the product.

[0033] In an embodiment of the present invention, the first homogenizing layer 2 is a concave microlens array, specifically a concave quadrilateral microlens array. In the concave quadrilateral microlens array, the quadrilateral includes a rectangle and a square. The long side length of the quadrilateral is 20 to 300um, the long side curvature radius is 30 to 150um, the short side length is 10 to 150um, and the short side curvature radius is 20 to 150um. The present invention forms a concave microlens array downward on the surface of the glass substrate, which can improve the imaging quality. At the same time, the homogenizing device is made entirely of glass, has stable performance, is almost unaffected by environmental factors such as temperature, and has a long service life.

[0034] In the embodiment of the present invention, the size and sagittal height of the concave quadrilateral microlenses are the same or different. The inconsistency of the size and sagittal height of the concave quadrilateral microlenses can eliminate imaging problems such as bright and dark stripes caused by light diffraction.

[0035] In the embodiment of the present invention, adjacent concave quadrilateral micro-lenses are closely arranged without any platform.

[0036] In the embodiment of the present invention, the surface of the concave microlens array is smooth, the surface roughness Ra is 10-50nm, and the PV value is 0.1-1um. The lower the surface roughness, the smoother it is, the better the imaging quality, especially having a significant impact on improving the graininess of the imaging.

[0037] In the embodiment of the present invention, the second light homogenizing layer 3 is a concave quadrilateral microlens array, a concave compound eye microlens array, or a concave cylindrical microlens array, which is the same as the first light homogenizing layer 2 .

[0038] In the embodiment of the present invention, the lens of the concave compound eye micro lens array is spherical or ellipsoidal, with a pitch of 500-1500um and a curvature radius of 10-100um. The concave compound eye micro lens is spherical or ellipsoidal and can form different viewing angles.

[0039] In the embodiment of the present invention, the surface roughness Ra of the concave compound eye microlens array is 100-500nm, and the PV value is 0.5-2um. The lower the surface roughness, the smoother it is, and the better the imaging quality is, especially having a significant impact on improving the granularity of imaging.

[0040] In the embodiment of the present invention, the concave compound eye micro lens array is arranged orthogonally. The orthogonal arrangement of the concave compound eye micro lens array can eliminate imaging problems such as graininess.

[0041] In the embodiment of the present invention, the top view of the concave cylindrical microlens array is a closely connected rectangle, the pitch is 200-1000um, and the curvature radius is 10-50um. The imaging field of view can be expanded, and different pitches and curvature radii can be adjusted to achieve different field of view angles.

[0042] In the embodiment of the present invention, the surface roughness Ra of the concave cylindrical microlens array is 50-200nm, and the PV value is 0.1-1um. The lower the surface roughness, the smoother it is, and the better the imaging quality, especially has a significant impact on improving the graininess of the imaging.

[0043] In the embodiment of the present invention, the method for preparing the concave microlens array of the first light homogenizing layer 2 and the second light homogenizing layer 3 includes but is not limited to yellow light wet etching, gas dry etching, glass molding, laser direct writing, and single-point diamond turning.

[0044] The light homogenizing device with the above structure forms a characteristic microstructure on the surface of the glass substrate, which can improve the imaging quality. At the same time, the glass-based light homogenizing device has stable performance, is almost unaffected by environmental factors such as temperature, and has a long service life. Moreover, the diffusion angle in the horizontal and vertical directions can be customized at any angle to achieve uniform distribution of the rectangular light field.

[0045] The present invention also provides a method for manufacturing a light homogenizing device, comprising the following steps:

[0046] S1, providing a base layer 1, a first light-dotting layer 2 and a second light-dotting layer 3;

[0047] S2, assembling the base layer 1 with the first light homogenizing layer 2 and the second light homogenizing layer 3, wherein the first light homogenizing layer 2 is installed on one side surface of the base layer 1, and the second light homogenizing layer 3 is installed on the other side surface of the base layer 1.

[0048] In the above step S1 , the base layer 1 is a glass base that has been subjected to thinning, cutting, CNC processing, and chemical strengthening treatments in sequence.

[0049] In the above step S1, the method for preparing the concave microlens array of the first light homogenizing layer 2 and the second light homogenizing layer 3 includes but is not limited to yellow light wet etching, gas dry etching, glass molding, laser direct writing, and single-point diamond turning.

[0050] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A light homogenizing device, characterized in that: The invention comprises a base layer, a first light evening layer and a second light evening layer, wherein the base layer is located between the first light evening layer and the second light evening layer, the first light evening layer is arranged on one side surface of the base layer, and the second light evening layer is arranged on the other side surface of the base layer.

2. The light homogenizing device according to claim 1, characterized in that: The base layer is made of glass, and has a thickness of 0.1-0.5 mm.

3. The light homogenizing device according to claim 1, characterized in that: The refractive index of the base layer is 1.4 to 2.

2.

4. The light homogenizing device according to any one of claims 1 to 3, characterized in that: The first light homogenizing layer is a concave quadrilateral microlens array, the quadrilateral includes a rectangle and a square, and the sizes and sags of the concave quadrilateral microlenses are the same or different.

5. The light homogenizing device according to claim 4, characterized in that: The length of the long side of the quadrilateral is 20-300um, and the radius of curvature of the long side is 30-150um. The length of the short side of the quadrilateral is 10-150um, and the radius of curvature of the short side is 20-150um.

6. The light homogenizing device according to any one of claims 1 to 5, characterized in that: The second light homogenizing layer is a concave quadrilateral microlens array, a concave compound eye microlens array or a concave cylindrical microlens array.

7. The light homogenizing device according to claim 6, characterized in that: The lenses of the concave compound eye microlens array are spherical or ellipsoidal, with a pitch of 500-1500um and a curvature radius of 10-100um; the surface roughness Ra of the concave compound eye microlens array is 100-500nm, and the PV value is 0.5-2um.

8. The light homogenizing device according to claim 6, characterized in that: The concave compound-eye microlens array is arranged orthogonally.

9. The light homogenizing device according to claim 6, characterized in that: The top view of the concave cylindrical microlens array is a closely connected rectangle, with a pitch of 200 to 1000 um and a curvature radius of 10 to 50 um.

10. The method for manufacturing a light homogenizing device according to any one of claims 1 to 9, characterized in that: Includes steps: S1. Providing a base layer, a first light-dotting layer, and a second light-dotting layer; S2. Assemble the base layer, the first light dodging layer, and the second light dodging layer. The first light dodging layer is installed on one side surface of the base layer, and the second light dodging layer is installed on the other side surface of the base layer.

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