Optical filter fixing structure and fixing process thereof

Abstract

The optical filter fixing structure comprises a support, a light hole is formed in the center of the support, an optical filter is arranged on the support, the face, attached to the optical filter, of the support is coated with UV glue, the optical filter is pressed on the UV glue, and a first gap is formed between the edge of the optical filter and the support; a screen printing layer is arranged on the edge of the optical filter, and the distance between the edge of the screen printing layer and the center of the filter lens is larger than the distance between the edge of the support and the center of the filter lens. Therefore, the UV glue is quickly cured, and the assembly efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of lens coating, and in particular to a filter fixing structure and a fixing process thereof. Background Art

[0002] Both blue glass and white glass are used in optical glass. After the blue glass or white glass is coated, it is screen-printed and fixed on the product bracket, and then installed on the optical lens. In the prior art, the filter is usually coated with UV glue and cured by ultraviolet irradiation. The photosensitizer in the UV glue component is irradiated by UV light and absorbs its energy. The chemical bonds of the photosensitizer break and decompose into active free radicals. The active free radicals, with the assistance of the cross-linking agent, initiate the polymerization and cross-linking reaction of the monomers and oligomers in the component and cure quickly.

[0003] However, in the actual preparation process, since the IR coating of the filter is cut off from ultraviolet rays, when irradiated in a UV box, the IR coating will reflect ultraviolet rays, resulting in the inability to irradiate or only partially irradiate the UV glue in the gap between the filter and the bracket, which in turn causes the UV glue to not be completely cured and leads to a low assembly yield. Summary of the invention

[0004] In order to solve the above technical problems, the present invention proposes a filter fixing structure, including a bracket, a light-transmitting hole is provided in the center of the bracket, a filter is provided on the bracket, UV glue is coated on the side of the bracket that is in contact with the filter, the filter is pressed on the UV glue and a first gap is provided between the edge and the bracket; a silk-screen layer is provided at the edge of the filter, and the distance between the edge of the silk-screen layer and the center of the filter is greater than the distance between the edge of the bracket and the center of the filter.

[0005] Preferably, the silk-screen layer completely covers the edge of the upper surface of the filter.

[0006] Preferably, the silk-screen layer leaves a second gap at the edge of the upper surface of the filter.

[0007] Preferably, the width of the first gap occupies 1 / 3 to 1 / 2 of the entire bottom surface of the bracket.

[0008] Preferably, one side of the filter is provided with an IR coating, and the side in contact with the bracket is provided with an AR coating.

[0009] A filter fixing process comprises the following steps:

[0010] S1: Take white glass or blue glass, perform surface coating to prepare a filter, and then clean it;

[0011] S2: Laser cutting of the filter, the cut surface of the filter edge is smooth, and ultrasonic cleaning is performed again;

[0012] S3: Take the positioning jig, apply UV glue on the bottom of the bracket, place the bracket on the bottom of the positioning jig, set the top of the bracket to a fixed position, place the cut filter on the bracket and press it on the UV glue;

[0013] S4: S4: Irradiate ultraviolet light on the top of the fixture, and the front of the ultraviolet light irradiates the first gap between the filter and the bracket. At the same time, the inclined ultraviolet light irradiates from the cut surface of the filter into the UV glue. The bottom of the fixture uses the center of the filter as a reference to irradiate the ultraviolet light in a trumpet shape. The inclined ultraviolet light passes through the AR surface and irradiates the back of the IR surface, and is folded onto the UV glue between the contact surface of the filter and the bracket.

[0014] Preferably, the positioning fixture includes a planar limiting plate, a plurality of supporting legs are provided at the lower part of the planar limiting plate, a through hole is provided at the planar limiting plate, a plurality of limiting ridges are provided on the surface of the lower part of the planar limiting plate, the limiting ridges are used for the bracket position, and the through holes are arranged concentrically with the limiting ridges.

[0015] Preferably, the lower ultraviolet light is irradiated at an angle of 45°.

[0016] Preferably, frontal and oblique irradiation ultraviolet light is provided above the fixture.

[0017] The filter fixing structure and fixing process proposed in the present invention have the following beneficial effects: the present invention positions the filter by setting a bracket, and then irradiates ultraviolet light on both sides, which can reflect the ultraviolet light multiple times at the UV glue position through the IR coating of the filter itself, thereby quickly curing the UV glue and improving assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for describing the embodiments are briefly introduced below.

[0019] Figure 1 It is a structural schematic diagram of embodiment 1 of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0021] Figure 3 is a schematic diagram of a positioning fixture of the present invention;

[0022] Among them, 1. bracket; 2. light-transmitting hole; 3. filter; 4. UV glue; 5. first gap; 6. silk-screen layer; 7. second gap; 8. IR coating; 9. AR coating; 10. support foot; 11. through hole; 12. plane limit plate; 13. limit convex strip. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0024] Example 1

[0025] like Figure 1 As shown, the present invention proposes a filter fixing structure, including a bracket 1, a light transmission hole 2 is provided at the center of the bracket 1, a filter 3 is provided on the bracket 1, and the filter 3 covers the position of the light transmission hole 2. One side of the filter 3 is provided with an IR coating 8, and the side that is attached to the bracket 1 is provided with an AR coating 9. In this embodiment, the filter 3 is circular, and the corresponding light transmission hole 2 is also circular. It is necessary to ensure that the center of the filter 3 overlaps with the center of the light transmission hole 2. The side of the bracket 1 that is attached to the filter 3 is coated with UV glue 4, and the filter 3 is pressed on the UV glue 4 and a first gap 5 is provided between the edge and the bracket 1. The width of the first gap 5 accounts for 1 / 3 to 1 / 2 of the bottom surface of the entire bracket 1; the edge of the filter 3 is provided with a silk screen layer 6, and the distance between the edge of the silk screen layer 6 and the center of the filter is greater than the distance between the edge of the bracket 1 and the center of the filter. The silk screen layer 6 is to filter more light and improve the optical performance of the filter 3.

[0026] In this embodiment, the silk-screen layer 6 leaves a second gap 7 at the edge of the upper surface of the filter 3. By leaving the second gap 7, when ultraviolet light is irradiated from the front, it can cure the UV glue 4 through the first gap 5 and the second gap 7, and the lower part of the bracket 1 is also provided with a light-transmitting hole 2, and the UV glue 4 is cured from the lower part by ultraviolet light irradiation at the lower part. Specifically:

[0027] A filter fixing process comprises the following steps:

[0028] S1: Take white glass or blue glass, perform surface coating to prepare filter 3, then wash it, and coat it with IR film and AR film respectively;

[0029] S2: Laser cutting the filter 3, the cut surface of the edge of the filter 3 is smooth, and ultrasonic cleaning is performed again; the filter 3 is cut by laser to ensure that the cut surface is smooth to ensure that when ultraviolet light is irradiated, it can pass through the edge of the filter 3 and be absorbed.

[0030] S3: Take a positioning jig, apply UV glue 4 on the bottom surface of the bracket 1, place the bracket 1 on the lower part of the positioning jig, set the upper part of the bracket 1 to a fixed position, place the cut filter 3 on the bracket 1 and press it on the UV glue 4; Figure 3As shown, the positioning fixture includes a plane limiting plate 12, a plurality of legs 10 are provided at the bottom of the plane limiting plate 12, a through hole 11 is provided on the plane limiting plate 12, and multiple groups of through holes 11 can be provided. A plurality of limiting ridges 13 are provided on the surface of the bottom of the plane limiting plate 12, and the limiting ridges 13 are used for the position of the bracket 1. The through hole 11 and the limiting ridges 13 are concentrically arranged. The bracket 1 is placed at the bottom of the plane limiting plate 12, and the limiting ridges 13 on the lower surface are circular. The opening of the bracket 1 is restricted inside the limiting ridges 13, and the filter falls through the through hole 11. Since the through hole 11 and the limiting ridges 13 are concentrically arranged, it can ensure that the filter is aligned with the center of the bracket 1. When the filter is placed on the upper part of the UV glue 4, it is subsequently cured by irradiating ultraviolet rays. Specifically:

[0031] S4: Irradiate ultraviolet light on the top of the fixture, and the ultraviolet light is irradiated into the first gap 5 between the filter 3 and the bracket 1 from the front. At the same time, the inclined ultraviolet light is irradiated from the cut surface of the filter 3 to enter the UV glue 4. The ultraviolet light is diffused in a trumpet shape with the center of the filter 3 as the reference below the fixture. The inclined ultraviolet light passes through the AR surface and irradiates to the back of the IR surface, and is folded to the UV glue 4 between the contact surface of the filter 3 and the bracket 1. In this embodiment, there is a second gap 7 between the silk-screen line and the edge of the filter 3. During irradiation, the ultraviolet light on the IR surface is irradiated from the silk-screen second gap 7 and the first gap 5 to the lower UV glue 4, and the obliquely irradiated ultraviolet light is taken in from the cut surface of the side of the filter 3, irradiates the UV glue 4 and then cures the UV glue 4. At the same time, ultraviolet irradiation is also set on one side of the AR surface. From the proof that it has been irradiated at an inclined angle, the ultraviolet light passes through the filter and is reflected on the IR surface set to increase the curing speed of the UV glue 4 and improve production efficiency.

[0032] Example 2

[0033] In this embodiment, the difference from Embodiment 1 is that Figure 2 As shown, there is no second gap 7 between the silk-screen layer 6 and the edge of the filter 3. As a result, when ultraviolet rays are irradiated from the front, most of the ultraviolet rays are blocked by the silk-screen layer 6, and less ultraviolet rays can be reflected on the UV glue 4, which greatly increases the UV curing time. In this embodiment, an ultraviolet lamp is also provided on one side of the AR surface for irradiation. The ultraviolet rays are irradiated at a trumpet-shaped angle at a 45-degree inclination angle. When irradiating to the back of the IR surface, the ultraviolet light passing through the filter 3 can be reflected to the UV glue 4 through the back of the IR surface, which can greatly increase the curing time of the UV glue 4.

Claims

1. A filter fixing structure, characterized in that: It comprises a bracket, a light-transmitting hole is provided at the center of the bracket, a filter is provided on the bracket, UV glue is coated on the side of the bracket that is in contact with the filter, the filter is pressed on the UV glue and a first gap is provided between the edge and the bracket; a silk-screen layer is provided at the edge of the filter, and the distance between the edge of the silk-screen layer and the center of the filter is greater than the distance between the edge of the bracket and the center of the filter.

2. The optical filter fixing structure according to claim 1, characterized in that: The silk-screen layer completely covers the edge of the upper surface of the filter.

3. The filter fixing structure according to claim 1, characterized in that: The silk-screen layer leaves a second gap at the edge of the upper surface of the filter.

4. The optical filter fixing structure according to claim 1, characterized in that: The width of the first gap occupies 1 / 3 to 1 / 2 of the entire bottom surface of the bracket.

5. The optical filter fixing structure according to claim 1, characterized in that: One side of the filter is provided with an IR coating, and the side in contact with the bracket is provided with an AR coating.

6. A filter fixing process, characterized in that: The following steps are involved: S1: Take white glass or blue glass, perform surface coating to prepare a filter, and then clean it; S2: Laser cutting of the filter, the cut surface of the filter edge is smooth, and ultrasonic cleaning is performed again; S3: Take the positioning jig, apply UV glue on the bottom of the bracket, place the bracket on the bottom of the positioning jig, set the top of the bracket to a fixed position, place the cut filter on the bracket and press it on the UV glue; S4: Irradiate ultraviolet light on the top of the fixture. The front of the ultraviolet light irradiates the first gap between the filter and the bracket. At the same time, the inclined ultraviolet light irradiates from the cut surface of the filter into the UV glue. The bottom of the fixture irradiates the ultraviolet light in a trumpet shape with the center of the filter as the reference. The inclined ultraviolet light passes through the AR surface and irradiates the back of the IR surface, and is folded onto the UV glue between the contact surface of the filter and the bracket.

7. The filter fixing process according to claim 6, characterized in that: The positioning fixture includes a planar limiting plate, a plurality of supporting legs are provided at the lower part of the planar limiting plate, a through hole is provided at the planar limiting plate, a plurality of limiting convex strips are provided on the surface of the lower part of the planar limiting plate, the limiting convex strips are used for the bracket position, and the through hole is concentrically arranged with the limiting convex strips.

8. The optical filter fixing process according to claim 6, characterized in that: The lower UV light is irradiated at a 45° angle.

9. The optical filter fixing process according to claim 6, characterized in that: There are front and oblique UV lights above the fixture.

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