Stray light removing shading sheet for variable aperture of optical system

Abstract

The invention belongs to the technical field of optical systems, and particularly relates to a stray light removing anti-dazzling screen for an iris diaphragm of an optical system, which comprises an upper surface and a lower surface which are parallel to each other, and a left side surface and a right side surface which are connected between the upper surface and the lower surface, the left side face forms an inclined section in a laser cutting or die punching mode. Compared with the prior art, through ingenious structural design, a laser cutting or die punching method is adopted, an inclined section is formed on the left side face, the reflection area can be reduced, the reflection angle can be changed, the reflectivity can be reduced, and the effect of removing stray light is finally achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of optical systems, and in particular relates to a stray light removing shading sheet for a variable aperture of an optical system. Background Art

[0002] With the advancement of science and technology and the improvement of people's quality of life, mobile phones, flat panel lights and portable electronic products have developed rapidly, which has led to an increasing demand for the imaging lenses used therein. The lens generally includes a lens barrel, a lens group assembled in the lens barrel and a shading sheet. The function of the shading sheet is to adjust the luminous flux in the optical system. When external light enters the lens, the shading sheet between the lenses can block the entry of unwanted light.

[0003] The existing shading sheet includes a parallel upper surface and a lower surface, and a left side surface and a right side surface for connecting the upper surface and the lower surface, wherein the left side surface and the right side surface are both vertical sections. The shading sheet of this structure cannot play the effect of removing stray light, resulting in poor optical effect of the lens. In actual use, a number of shading sheets are arranged in a ring, and the left sides of each shading sheet together form an aperture hole. The size of the aperture hole can be adjusted by moving the shading sheet, thereby controlling the light flux.

[0004] In view of this, the present invention aims to provide a stray light removing shading sheet for a variable aperture of an optical system, which, through a clever structural design and a laser cutting or mold punching method, forms an inclined section on the left side surface, which can reduce the reflection area, change the reflection angle, and reduce the reflectivity, ultimately achieving the effect of removing stray light. Summary of the invention

[0005] The purpose of the present invention is to provide a stray light removing shading sheet for variable aperture of optical system in view of the shortcomings of the prior art. The shading sheet has an ingenious structure and process design and adopts laser cutting or mold punching method to form an inclined section on the left side surface, which can reduce the reflection area, change the reflection angle, reduce the reflectivity, and finally achieve the effect of removing stray light.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A stray light shielding sheet for a variable aperture of an optical system, the shielding sheet comprises an upper surface, a lower surface parallel to each other, and a left side surface and a right side surface connected between the upper surface and the lower surface, the left side surface is formed into an inclined section by laser cutting or die punching.

[0008] As an improvement of the stray light shielding sheet for the variable aperture of the optical system of the present invention, the inclined section includes a plurality of small sections formed by laser layered cutting, and the plurality of small sections are accumulated into the inclined section.

[0009] As an improvement of the stray light shielding sheet for the variable aperture of the optical system of the present invention, the lateral position of the small cross section gradually shifts to the left from top to bottom.

[0010] As an improvement of the stray light shielding sheet for the variable aperture of the optical system of the present invention, the height of the small section is 5%-20% of the thickness of the shielding sheet.

[0011] As an improvement of the stray light shielding sheet for the variable aperture of the optical system of the present invention, the width of the small section is 5%-20% of the thickness of the shielding sheet.

[0012] As an improvement of the stray light shielding sheet for the variable aperture of the optical system of the present invention, the shape of the small cross section is "┘" shape, shape, shape or “>” shape.

[0013] As an improvement of the stray light removing shading sheet for the variable aperture of the optical system of the present invention, the right side surface is a vertical section.

[0014] As an improvement of the stray light shading sheet for the variable aperture of the optical system of the present invention, the mold used for punching and cutting to form the inclined section includes a forward punching mold and a bevel cutting mold. The specific process is: first, the sheet is placed in the mold, and the right side of the shading sheet is forward punched by the forward punching mold. After the forward punching is completed, the mold is punched back to its position, and the bevel cutting mold is used to bevel punch the left side of the shading sheet to form an inclined section.

[0015] As an improvement of the stray light shielding sheet for the variable aperture of the optical system of the present invention, the positive punching die comprises an upper pad, an upper clamping plate arranged below the upper pad, and an upper punch arranged in the upper clamping plate;

[0016] From bottom to top, the bevel cutting die includes a lower die seat, a lower pad, a lower template, a slider seat, a first side clamp, a punch fixing block and a second side clamp. From left to right, a side cutting slide, a knife edge and a floating block are arranged in the lower template. A floating pressing block is arranged on one side of the floating block. A side cutting punch is arranged between the first side clamp and the punch fixing block.

[0017] As an improvement of the stray light shielding sheet for the variable aperture of the optical system of the present invention, when in use, a plurality of the shielding sheets are arranged in a ring to assemble into a variable aperture, and the left sides together surround an aperture hole.

[0018] Compared with the existing technology, it uses ingenious structure and process design, and adopts laser cutting or mold punching methods to form an inclined section on the left side surface, which can reduce the reflection area, change the reflection angle, reduce the reflectivity, and ultimately achieve the effect of removing stray light. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional schematic diagram of embodiment 1 of the present invention.

[0020] Figure 2 This is a schematic diagram of the processing technology of Example 1 of the present invention.

[0021] Figure 3 It is a cross-sectional schematic diagram of embodiment 2 of the present invention.

[0022] Figure 4 This is a schematic diagram of the structure of the mold used in Example 2 of the present invention. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is described below with specific embodiments, but the protection scope of the present invention is not limited thereto.

[0024] Example 1

[0025] like Figure 1-2 As shown, this embodiment provides a stray light shading sheet for a variable aperture of an optical system, the shading sheet includes an upper surface 1 and a lower surface 2 which are parallel to each other, and a left side surface 3 and a right side surface 4 connected between the upper surface 1 and the lower surface 2, and the left side surface 3 is formed into an inclined section by laser cutting.

[0026] Specifically, the inclined section includes a plurality of small sections 41 formed by laser layered cutting, and a plurality of small sections 31 are accumulated to form the inclined section.

[0027] From top to bottom, the lateral position of the small section 31 gradually shifts to the left.

[0028] The height of the small section 31 is 5%-20% of the thickness of the light shielding sheet, wherein the thickness of the light shielding material is about 0.04 mm.

[0029] The width of the small section 31 is 5%-20% of the thickness of the light shielding sheet.

[0030] The shape of the small section 31 is preferably a "┘" shape, but it can also be shape, shape or “>” shape.

[0031] Preferably, each small section 31 has the same shape and size.

[0032] The right side surface 31 is a vertical section.

[0033] like Figure 2As shown, the working principle of laser layered cutting is as follows: using laser cutting equipment 10, the left oblique section adopts laser layered cutting, each layer is cut about 0.005mm deep (preferred depth), and each layer of cut section is offset from top to bottom to the left by about 0.005mm (preferred offset position); through multi-layer superposition cutting, a number of uniform and tiny small sections 31 are formed, and these small sections 31 are accumulated to form an oblique section, while other cut sections are directly cut into vertical sections, thereby forming a special section combination of multilateral vertical sections and local oblique sections. Forming an inclined section on the left side can reduce the reflection area, change the reflection angle, reduce the reflectivity, and ultimately achieve the effect of removing stray light.

[0034] When in use, a plurality of the light shielding sheets are arranged in a ring shape to be assembled into a variable aperture, and the left side surfaces 3 together surround an aperture hole.

[0035] Example 2

[0036] like Figure 3 and 4 As shown, different from the first embodiment, the present embodiment adopts a die punching method to form the inclined section of the left side surface 3 .

[0037] like Figure 4 As shown, the molds used for punching and cutting to form the inclined section in this embodiment include a straight punch mold 5 and a bevel cutting mold 6. The specific process is: first, the sheet is placed in the mold, and the right side of the shading sheet is punched straight by the straight punch mold 5. After the straight punch is completed, the mold is punched back to its position, and the bevel cutting mold 6 performs bevel punching on the left side of the shading sheet to form an inclined section.

[0038] The punch die 5 includes an upper pad 51, an upper clamping plate 52 disposed below the upper pad 51, and an upper punch 53 disposed in the upper clamping plate 52;

[0039] From bottom to top, the bevel cutting die 6 includes a lower die base 61, a lower pad 62, a lower mold plate 63, a slider seat 64, a first side clamp 65, a punch fixing block 66 and a second side clamp 67. From left to right, a side cutting slide 68, a cutting edge 69 and a floating block 610 are arranged in the lower mold plate 61. A floating pressing block 611 is arranged on one side of the floating block 610. A side cutting punch 612 is arranged between the first side clamp 65 and the punch fixing block 66.

[0040] The positive punch die 5 is driven by a first driving mechanism so as to be able to move up and down.

[0041] The floating block 610 and the floating pressing block 611 can float up and down.

[0042] The punch fixing block 66 is driven by the second driving mechanism so that it can move to the lower left or return to the upper right.

[0043] When using, the specific steps include:

[0044] In the first step, the upper punch 53 is pressed downward to interact with the blade 69 to cut out the right side shape of the product; and after the punching is completed, it is lifted upward;

[0045] In the second step, the floating pressing block 611 and the floating block 610 cooperate to press and fix the cut product;

[0046] In the third step, the punch fixing block 66 moves to the lower left, bringing the side cutting punch 612 with it; the side cutting slide 68 guides the side cutting punch 612 so that the side cutting punch 612 is stably tangent to the product;

[0047] In the fourth step, when the side cutting punch 612 runs tangent to the left edge of the product, a chamfer of the product edge - a left bevel - is formed.

[0048] The rest is the same as in Example 1 and will not be described again. With respect to the prior art, this embodiment uses a clever structure and process design, and adopts a laser cutting or die punching method to form an inclined section on the left side 3, which can reduce the reflection area, change the reflection angle, reduce the reflectivity, and ultimately achieve the effect of removing stray light.

[0049] According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs may also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the thickness and material of the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention.

Claims

1. A stray light shielding sheet for a variable aperture of an optical system, characterized in that: The shading sheet comprises an upper surface and a lower surface which are parallel to each other, and a left side surface and a right side surface connected between the upper surface and the lower surface. The left side surface is formed into an inclined section by laser cutting or die punching.

2. The stray light shielding sheet for variable aperture of an optical system according to claim 1, characterized in that: The inclined section includes a plurality of small sections formed by laser layered cutting, and the plurality of small sections are accumulated to form the inclined section.

3. The stray light shielding sheet for variable aperture of an optical system according to claim 2, characterized in that: From top to bottom, the lateral position of the small section gradually shifts to the left.

4. The stray light shielding sheet for variable aperture of an optical system according to claim 2, characterized in that: The height of the small section is 5%-20% of the thickness of the light shielding sheet.

5. The stray light shielding sheet for variable aperture of an optical system according to claim 2, characterized in that: The width of the small section is 5%-20% of the thickness of the light shielding sheet.

6. The stray light shielding sheet for variable aperture of an optical system according to claim 2, characterized in that: The shape of the small section is shape, shape, shape or ">" shape.

7. The stray light shielding sheet for variable aperture of an optical system according to claim 1, characterized in that: The right side surface is a vertical section.

8. The stray light shielding sheet for variable aperture of an optical system according to claim 1, characterized in that: The molds used for die punching to form inclined sections include straight punch molds and bevel cutting molds. The specific process is: first put the sheet into the mold, and use the straight punch mold to perform straight punching on the right side of the shading sheet. After the straight punching is completed, the mold punches back to its position, and the bevel cutting mold performs bevel punching on the left side of the shading sheet to form an inclined section.

9. The stray light shielding sheet for variable aperture of an optical system according to claim 8, characterized in that: The positive punch die comprises an upper pad, an upper clamping plate arranged below the upper pad, and an upper punch arranged in the upper clamping plate; From bottom to top, the bevel cutting die includes a lower die seat, a lower pad, a lower template, a slider seat, a first side clamp, a punch fixing block and a second side clamp. From left to right, a side cutting slide, a knife edge and a floating block are arranged in the lower template. A floating pressing block is arranged on one side of the floating block. A side cutting punch is arranged between the first side clamp and the punch fixing block.

10. The stray light shielding sheet for variable aperture of an optical system according to claim 1, characterized in that: When in use, a plurality of the light shielding sheets are arranged in a ring shape to be assembled into a variable aperture, and the left sides together surround an aperture hole.

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