Optical shading sheet

Abstract

The present utility model relates to the technical field of shading sheets, and discloses an optical shading sheet, comprising a first shading plate and a second shading plate, wherein a first light-transmitting hole is provided in the middle of the first shading plate, and a second light-transmitting hole is provided in the middle of the second shading plate, and the diameter of the first light-transmitting hole is smaller than the diameter of the second light-transmitting hole; an annular side wall is circumferentially arranged on the top of the first shading plate, and the annular side wall cooperates with the first shading plate to form an installation groove, the installation groove is connected to the first light-transmitting hole, and the second shading plate is installed in the installation groove; the present utility model has the following advantages: 1. An installation groove for positioning and installing the second shading plate is provided in the middle of the first shading plate, and the first shading plate and the second shading plate are positioned and installed through the installation groove, and the molding process is simpler and the molding efficiency is higher; 2. The connection between the multiple shading plates is more firm, and the quality of the shading sheet after molding is better.

Description

Technical Field

[0001] The utility model relates to the technical field of shading sheets, in particular to an optical shading sheet. Background Art

[0002] A shading sheet, also known as a light blocking sheet, is a necessary shading element in the fields of video cameras, mobile phone cameras, etc. Its purpose is to prevent stray light from entering the viewfinder and affecting the quality of imaging. The light blocking sheet used in the camera is also called an aperture, a shading ring, a Mylar sheet, etc.

[0003] The existing camera shading sheet is formed by brushing glue on both sides of a multi-layer sheet material and gluing and bonding. However, the shading sheet with this molding structure has many steps of brushing glue and the multi-layer materials need to be bonded in precise corresponding positions, so the molding cycle is long and the molding efficiency is too low. On the other hand, the bonding between the multi-layer materials is prone to be loose, and the shading sheet is easy to spread out, which is not conducive to ensuring the quality of the shading sheet. In view of this, the inventor has made a new invention. Utility Model Content

[0004] The utility model aims to provide an optical shading sheet with the advantages of high molding efficiency and firm connection in view of the deficiencies in the prior art.

[0005] To achieve the above-mentioned purpose, the utility model is an optical shading sheet, comprising a first shading plate and a second shading plate, a first light-transmitting hole is opened in the middle of the first shading plate, a second light-transmitting hole is opened in the middle of the second shading plate, and the diameter of the first light-transmitting hole is smaller than the diameter of the second light-transmitting hole; an annular side wall is circumferentially arranged on the top of the first shading plate, and the annular side wall cooperates with the first shading plate to form an installation groove, the installation groove is connected to the first light-transmitting hole, and the second shading plate is installed in the installation groove.

[0006] Preferably, outer surfaces of the first shading plate and the second shading plate are both coated with an ink layer.

[0007] Preferably, an annular clamping portion is protruded from the inner middle portion of the annular side wall; and an annular clamping groove matched with the annular clamping portion is formed in the middle portion of the second shading plate.

[0008] Preferably, the annular clamping portion is provided with at least one elastic notch.

[0009] Preferably, the first shading plate and the second shading plate are both made of PET material.

[0010] Preferably, the side wall of the first light-transmitting hole is arranged to be inclined toward the central axis of the first light-shielding plate.

[0011] Preferably, the side wall of the second light-transmitting hole is arranged to be inclined toward the central axis of the second light-shielding plate.

[0012] Preferably, a plurality of arc-shaped portions are evenly distributed on the side wall of the second light-transmitting hole.

[0013] Beneficial effects: Compared with the prior art, the utility model is an optical shading sheet, and the utility model has the following advantages: 1. A mounting groove for positioning and installing the second shading sheet is provided in the middle of the first shading plate, and the first shading plate and the second shading plate are positioned and installed through the mounting groove, and the molding process is simpler and the molding efficiency is higher; 2. The connection between the multiple shading plates is more firm, and the quality of the shading sheet after molding is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0015] Figure 2 This is a schematic diagram of the first shading plate structure of the utility model.

[0016] Figure 3 This is a schematic diagram of the second shading plate structure of the utility model.

[0017] Figure 4 It is a schematic diagram of the longitudinal cross-sectional structure of an embodiment of the utility model.

[0018] Figure 5 It is a schematic diagram of the arc-shaped portion structure of the utility model.

[0019] Reference numerals include:

[0020] The first light shielding plate 1, the first light transmission hole 11, the annular side wall 12, the annular clamping portion 121, the elastic notch 122, the second light shielding plate 2, the second light transmission hole 21, the arc portion 211, the annular clamping groove 22, and the mounting groove 3. DETAILED DESCRIPTION

[0021] The following is combined with Figures 1 to 5 The utility model is described in detail.

[0022] The utility model is an optical shading sheet, comprising a first shading plate 1 and a second shading plate 2, wherein a first light-transmitting hole 11 is provided in the middle of the first shading plate 1, and a second light-transmitting hole 21 is provided in the middle of the second shading plate 2, wherein the diameter of the first light-transmitting hole 11 is smaller than the diameter of the second light-transmitting hole 21; an annular side wall 12 is provided circumferentially on the top of the first shading plate 1, wherein the annular side wall 12 cooperates with the first shading plate 1 to form a mounting groove 3, wherein the mounting groove 3 is connected to the first light-transmitting hole 11, and the second shading plate 2 is mounted in the mounting groove 3. The utility model has the following advantages: 1. The middle of the first shading plate is provided with a mounting groove, and the first shading plate and the second shading plate are positioned and installed through the mounting groove, thereby shortening the time for aligning the first shading plate and the second shading plate, making the overall molding process of the shading sheet more concise and the molding efficiency higher; 2. Due to the positioning of the mounting groove, the connection between the shading plates is more firm, the shading sheet after molding is not easy to fall apart, and the quality of the shading sheet is better.

[0023] Preferably, the outer surfaces of the first light shielding plate 1 and the second light shielding plate 2 are coated with an ink layer, which can be used to reflect light and absorb part of stray light to prevent stray light from affecting the imaging of the camera.

[0024] In order to further improve the technical solution, an annular clip portion 121 is protruded from the inner middle portion of the annular side wall 12; an annular clip groove 22 matched with the annular clip portion 121 is opened in the middle portion of the second light shielding plate 2, and the first light shielding plate 1 and the second light shielding plate 2 can be directly assembled using the annular clip portion 121 and the annular clip groove 22 without the need for additional steps, and the molding efficiency is further improved; the first light shielding plate 1 and the second light shielding plate 2 can also be further connected to the annular clip groove 22 using the annular clip portion 121 after coating the adhesive layer, and the stability of this connection method is further improved.

[0025] Preferably, the annular clamping portion 121 is provided with at least one elastic notch 122 , and the elastic notch 122 acts as a buffer, so that the second shading plate 2 can be smoothly clamped into the first shading plate 1 .

[0026] In the present technical solution, the first shading plate 1 and the second shading plate 2 are both formed of PET material. PET material has good thermal properties and is safe, environmentally friendly, and low in cost, and is the preferred molding material for shading plates.

[0027] Preferably, the side wall of the first light-transmitting hole 11 is inclined toward the central axis of the first light-shielding plate 1. The inclined hole wall makes the first light-transmitting hole 11 expandable, which can further filter the light entering the camera.

[0028] As an example, Figure 4As shown, the side wall of the second light-transmitting hole 21 is tilted toward the central axis of the second light-shielding plate 2. This embodiment cooperates with the tilted side wall of the first light-transmitting hole 11, so that the light-transmitting hole of the light-shielding plate presents a trumpet shape. Figure 1 The middle step-shaped light aperture will re-reflect most of the non-parallel scattered light and greatly reduce the amount of light entering the viewfinder, further eliminating the influence of stray light.

[0029] As another embodiment, Figure 5 As shown, a plurality of arc-shaped portions 211 are evenly distributed on the side wall of the second light-transmitting hole 21 . The arc-shaped portions 211 further expand the reflection area of ​​the light-shielding ring, and can also prevent the adverse effects of stray light on camera imaging.

[0030] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. An optical shading sheet, comprising a first shading plate (1) and a second shading plate (2), characterized in that: A first light-transmitting hole (11) is provided in the middle of the first light-shielding plate (1), and a second light-transmitting hole (21) is provided in the middle of the second light-shielding plate (2); the diameter of the first light-transmitting hole (11) is smaller than the diameter of the second light-transmitting hole (21); an annular side wall (12) is circumferentially arranged on the top of the first light-shielding plate (1); the annular side wall (12) cooperates with the first light-shielding plate (1) to form a mounting groove (3); the mounting groove (3) is connected to the first light-transmitting hole (11), and the second light-shielding plate (2) is mounted in the mounting groove (3).

2. The optical shading sheet according to claim 1, characterized in that: The outer surfaces of the first shading plate (1) and the second shading plate (2) are both coated with an ink layer.

3. The optical shading sheet according to claim 1, characterized in that: An annular clamping portion (121) is protruded from the inner middle of the annular side wall (12); and an annular clamping groove (22) matching the annular clamping portion (121) is provided in the middle of the second light shielding plate (2).

4. The optical shading sheet according to claim 3, characterized in that: The annular clamping portion (121) is provided with at least one elastic notch (122).

5. The optical shading sheet according to claim 1, characterized in that: The first shading plate (1) and the second shading plate (2) are both made of PET material.

6. The optical shading sheet according to claim 1, characterized in that: The side wall of the first light-transmitting hole (11) is arranged to be inclined towards the central axis of the first light-shielding plate (1).

7. The optical shading sheet according to claim 1, characterized in that: The side wall of the second light-transmitting hole (21) is arranged to be inclined towards the central axis of the second light-shielding plate (2).

8. An optical shading sheet according to any one of claims 1 to 7, characterized in that: A plurality of arc-shaped portions (211) are evenly distributed on the side wall of the second light-transmitting hole (21).

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