CN108427152A - Method for manufacturing optical lens with air space - Google Patents

Abstract

The invention relates to a method for manufacturing an optical lens with air space, which forms a material removing area with extremely small tolerance on a lens mould in a laser engraving way, and then forms a lens material on the lens mould, so that the optical lens manufactured and formed by the lens mould has a lens bearing area corresponding to the shape and the position of the material removing area, the size of the lens bearing area of the optical lens has high accuracy, the size of the air space structure generated by the joint between the optical lens and the optical lens is effectively controlled, the problem of poor assembly yield of the optical lens is improved, and the optical lens with better imaging quality are provided.

Description

Manufacturing method of optical lens with air gap

technical field

The invention relates to a method for manufacturing an optical lens, in particular to a method for manufacturing an optical lens with an air gap.

Background technique

Nowadays, the requirements for the imaging quality of optical lenses are getting higher and higher. Therefore, in order to improve the imaging quality of optical lenses, the existing technology will ) to make a concave-convex structure, so that the air in the inner space generated when the lenses are attached to each other can be discharged outward through the aforementioned concave-convex structure.

However, if you want to form a concave-convex structure on the flange area of the lens, you must first make the uneven surface on the corresponding position of the lens mold by traditional sandblasting or electric discharge method, and then remove the aforementioned uneven surface during the lens manufacturing process. The pattern on the surface is transferred to the flange area of the lens to form a concave-convex structure required to improve the imaging quality of the lens.

However, the quality of the uneven surface made by traditional sandblasting or electric discharge method varies greatly, and the depth of each depression and the height of each protrusion on the uneven surface cannot be precisely controlled.

In addition, due to the large tolerance of the uneven surface made by sandblasting or electric discharge method, it is difficult to achieve a tolerance of 2 μm to less than 3 μm, resulting in air formed when the lenses formed by the lens mold are attached to each other. The size of the gap structure varies greatly, and it is impossible to meet the requirement that the air gap of the optical lens at the current stage must be controlled below 1 μm, which directly affects the imaging quality of the optical lens after the assembly of the optical lens, thus resulting in the yield rate of the existing optical lens Poor question.

Contents of the invention

In view of the shortcomings and deficiencies of the prior art, a lens mold processing method capable of precisely controlling the surface of the lens mold is needed at this stage, which can greatly reduce the surface tolerance of the concave-convex structure of the flange area of the lens, so as to effectively control the gap between the lens and the lens. The size of the air space structure formed by the bonding between them can improve the yield rate of mass production of the optical lens and provide the optical lens with better imaging quality.

In order to achieve the purpose of the above invention, the technical means adopted by the present invention is to provide a method of manufacturing an optical lens with an air gap, wherein the method includes: forming at least one material removal area by laser engraving on a lens mold, the lens The mold includes a bottom surface and a top surface, and the at least one material removal area is formed on the top surface; then a lens material is formed on the top surface of the lens mold to form an optical lens, and the optical lens and the A lens bearing area is formed on a corresponding position of the aforementioned at least one material removal area.

The advantage of the present invention is that the laser engraving method is used to laser process the lens mold to form the material removal area, and the depth of the material removal area can be precisely controlled by laser engraving, helping to control the tolerance between each material removal area at 0.5 μm to 1μm, so that the lens bearing area of the formed optical lens using the lens mold also has the characteristics of extremely small tolerance, thereby effectively controlling the size of the air space structure formed by the bonding between the lens and the lens, Improve the problem of poor mass production yield of optical lenses.

Preferably, the top surface of the lens mold has a flat surface and an inner concave surface, and the at least one material removal area is formed on one of the flat surface or the inner concave surface or a combination thereof. Therefore, the manufacturer can choose the forming position of the material removal area by himself, and set the material removal area only on the planar part of the top surface or the concave part of the top surface according to his needs, or even set it on the top surface at the same time The flat part and the concave part.

More preferably, when the at least one material removal area is formed on the planar portion and the inner concave portion of the top surface, the material removal area of the planar portion is connected and corresponding to the position of the material removal area of the inner concave portion.

Preferably, the number of the aforementioned at least one material removal area is three, and they are arranged at intervals. The number of material removal areas here is not limited thereto, and the present invention only takes three material removal areas as an example, and it can also be set to a greater or lesser number of material removal areas.

Description of drawings

FIG. 1 is a three-dimensional appearance view of a lens mold according to a first embodiment of the present invention.

Fig. 2 is a side cross-sectional view of two optical lenses with an air gap that are attached to each other and formed by using the lens mold of the first embodiment of the present invention.

FIG. 3 is a three-dimensional appearance view of a lens mold according to a second embodiment of the present invention.

4 is a side cross-sectional view of two optical lenses with an air gap that are attached to each other and formed by using the lens mold of the second embodiment of the present invention.

FIG. 5 is a three-dimensional appearance view of a lens mold according to a third embodiment of the present invention.

FIG. 6 is a side cross-sectional view of two optical lenses with an air gap that are attached to each other and formed by using the lens mold of the third embodiment of the present invention.

Explanation of reference signs:

10 lens mold 11 top surface

111 flat part 112 concave part

12 Bottom surface 20 Material removal area.

Detailed ways

In the following, please cooperate with the accompanying drawings and preferred embodiments of the present invention to further elaborate the technical means adopted by the present invention to achieve the intended purpose of the invention.

The first embodiment of the manufacturing method of an optical lens with an air gap of the present invention is shown in FIG. Areas 20, the material removal areas 20 are respectively uneven and rugged surfaces. Then, the lens material is formed on the top surface 11 of the lens mold 10. After it is formed, an optical lens 30 (as shown in FIG. 2 ) with three lens bearing areas 31 can be formed, and the The three lens bearing areas 31 are also arranged at intervals.

A lens bearing area 31 whose shape corresponds to the rugged surface of the material removal area 20 is formed at the position of the optical lens 30 corresponding to the material removal area 20 of the lens mold 10 . Referring again to Fig. 2, when two optical lenses 30 are attached to each other, the lens abutment area 31 of one optical lens 30 will be attached to the different surface of the other optical lens 30 that is provided with an optical abutment area 31 contact, so as to assemble and form an optical lens. And the lens supporting area 31 sandwiched between the two optical lenses 30 can form an air space structure, so that the air in the internal space 40 can be discharged outwards through the air space structure, effectively avoiding the internal space. 40 is in an airtight state, thereby avoiding the reverse displacement between the two lenses when the optical lenses 30 are assembled because the internal space 40 is in an airtight state, so that the air space structure between the two optical lenses 30 will change, affecting Image quality.

The second embodiment of the manufacturing method of the optical lens with air gap of the present invention is shown in FIG. The material removal area 20A, the material removal area 20A is a rough and uneven surface. Then, the lens material is formed on the top surface 11 of the lens mold 10. After it is formed, an optical lens 30A (as shown in FIG. 4 ) with three lens bearing areas 31A can be formed, and the The three lens bearing areas 31A are also arranged at intervals.

A lens bearing area 31A whose shape corresponds to the rugged surface of the material removal area 20A is formed at the position of the optical lens 30A corresponding to the material removal area 20A of the lens mold 10 . Referring to Fig. 4 again, when two optical lenses 30A are attached to each other, the lens abutment area 31A of one optical lens 30A will be attached to the different surface of the other optical lens 30A which is provided with the lens abutment area 31A contact, so as to assemble and form an optical lens. And the lens supporting area 31A sandwiched between the two optical lenses 30A can form an air space structure, so that the air in the internal space 40A can be discharged outwards through the air space structure, effectively avoiding the internal space. 40A is in an airtight state, thereby avoiding the reverse displacement between the two lenses when the optical lenses 30A are assembled because the internal space 40A is in an airtight state, so that the air space structure between the two optical lenses 30A will change, affecting Image quality.

The third embodiment of the manufacturing method of the optical lens with an air gap of the present invention is shown in FIG. 5 , which is also formed on the flat surface 111 and the concave surface 112 of the top surface 11 of a lens mold 10 by laser engraving. There are three material removal areas 20B arranged at intervals, and the material removal area formed on the planar part 111 and the material removal area formed on the inner concave surface 112 are connected and corresponding, and the material removal areas 20B are respectively uneven and rugged noodle. Then, the lens material is formed on the top surface 11 of the lens mold 10. After it is formed, an optical lens 30B (as shown in FIG. 6 ) with three lens bearing regions 31B can be formed, and the The three lens bearing areas 31B are also arranged at intervals.

A lens bearing area 31B whose shape corresponds to the rugged surface of the material removal area 20B is formed at the position of the optical lens 30B corresponding to the material removal area 20B of the lens mold 10 . Referring again to Fig. 6, when two optical lenses 30B are attached to each other, the lens bearing area 31B of one optical lens 30B will be attached to the different surface of the other optical lens 30B which is provided with the lens bearing area 31B. contact, so as to assemble and form an optical lens. And the lens support area 31B sandwiched between the two optical lenses 30B can form an air space structure, so that the air in the internal space 40B can be discharged outwards through the air space structure, effectively preventing the internal space from 40B is in an airtight state, thereby avoiding the reverse displacement between the two lenses when the optical lenses 30B are assembled because the internal space 40B is in an airtight state, so that the air space structure between the two optical lenses 30B will change, affecting Image quality.

To sum up, the method for manufacturing an optical lens with an air gap provided by the present application uses laser engraving to form the material removal areas 20, 20A, 20B on the lens mold 10, and then utilizes the material removal area 20, The lens molds 10 of 20A, 20B form lens materials to manufacture shaped optical lenses 30, 30A, 30B, so that the optical lenses 30, 30A, 30B made by the manufacturing method provided by the application have fine lens bearing areas 31, 31A , 31B, the depth of each depression and the height of each protrusion of the lens bearing area 31, 31A, 31B can be precisely controlled, so that it can be placed in the lens bearing area of the two optical lenses 30, 30A, 30B When 31, 31A, 31B are attached and fixed to each other, an air gap structure is formed, and the air in the inner space 40, 40A, 40B between the two optical lenses 30, 30A, 30B is effectively removed, so as to prevent the two optical lenses 30, 30A, 30B from facing each other Reverse displacement occurs when fitting and fixing, causing troubles in assembly and affecting the quality of imaging.

In addition, the depth tolerance of each concave portion and the height tolerance of each convex portion of the material-cutting regions 20, 20A, 20B produced by laser engraving are extremely small, resulting in the formation of the optical lens 30, 30A, 30B. 31, 31A, 31B also have very small air space structural tolerances, which can effectively help the optical lenses 30, 30A, 30B formed by the lens mold 10 to be easily attached and aligned when they are attached to each other, reducing the optical cost. The ease of assembly of the lens is improved, and the assembly efficiency and mass production yield of the optical lens are improved, so as to provide an optical lens with better imaging effect.

Claims (10)

1. a kind of manufacturing method of the optical mirror slip with airspace comprising：

In forming at least one except material region on a lens mold with laser engraving, which includes a bottom surface and a top Face, described at least one is formed in except material region on the top surface；And

A lens materials are formed on the top surface of the lens mold, and then shape an optical mirror slip, and in the optical mirror slip With aforementioned at least one except formation lens holding area on the opposite position in material region.

2. the manufacturing method of the optical mirror slip with airspace as described in claim 1, wherein described at least one removes material region For a rough rugged face, and the lens holding area with described at least one except the material rugged face shape in region is corresponding.

3. the manufacturing method of the optical mirror slip with airspace, the wherein top surface of the lens mold as claimed in claim 1 or 2 With a planar portions and indent face.

4. the manufacturing method of the optical mirror slip with airspace as claimed in claim 3, wherein described at least one removes material region It is formed in the planar portions of the top surface.

5. the manufacturing method of the optical mirror slip with airspace as claimed in claim 3, wherein described at least one removes material region It is formed in the indent face of the top surface.

6. the manufacturing method of the optical mirror slip with airspace as claimed in claim 3, wherein described at least one removes material region Planar portions and the indent for being formed in the top surface are facial, and region is expected in the material region of removing of the planar portions with removing for indent face Position is connected correspondence.

7. the manufacturing method of the optical mirror slip with airspace as claimed in claim 1 or 2, wherein described at least one removes material area The quantity in domain is three, and it is set in distance.

8. the manufacturing method of the optical mirror slip with airspace as claimed in claim 3, wherein described at least one removes material region Quantity be three, and it is set in distance.

9. the manufacturing method of the optical mirror slip with airspace as claimed in claim 4, wherein described at least one removes material region Quantity be three, and it is set in distance.

10. the manufacturing method of the optical mirror slip with airspace as claimed in claim 5, wherein described at least one removes material region Quantity be three, and it is set in distance.