WO2022000604A1

WO2022000604A1 - Light shielding plate and lens module

Info

Publication number: WO2022000604A1
Application number: PCT/CN2020/103188
Authority: WO
Inventors: 马杰
Original assignee: 诚瑞光学(常州)股份有限公司
Priority date: 2020-06-30
Filing date: 2020-07-21
Publication date: 2022-01-06
Also published as: CN212569370U

Abstract

A light shielding plate (100) and a lens module. The lens module comprises a lens cone (200), a lens group arranged in the lens cone (200), and the light shielding plate (100). The lens group comprises a plurality of lenses (300), and the light shielding plate (100) is provided between the two lenses (300) closest to an image side. The light shielding plate (100) comprises a first body part (10) and a second body part (20) which are connected; the first body part (10) is annular, and the second body part (20) is located in the ring of the first body part (10); the first body part (10) is opaque, and the second body part (20) is opaque; the hardness of the material of the first body part (10) is greater than that of the material of the second body part (20). Moreover, the second body part (20) is a high polymer material body part having an extinction surface. The light shielding plate (100) is formed by connecting the first body part (10) and the second body part (20), and the first body part (10) and the second body part (20) are made of different materials, respectively, so that stray light can be effectively weakened while mechanical requirements are satisfied, thus lens module is prevented from being interfered by the stray light, the optical performance of the lens module is improved, and the imaging quality is improved.

Description

Light shield and lens module

technical field

The present application relates to the technical field of optical imaging, and in particular, to a shading plate and a lens module.

Background technique

In recent years, with the continuous development of science and technology, electronic equipment is constantly developing towards intelligence. In addition to digital cameras, electronic products such as tablet computers and mobile phones are also equipped with lens modules to meet the needs of users to take pictures at any time. As the lens module is used more and more widely, higher requirements are also put forward for the shooting quality of the lens module.

technical problem

Generally, the lens module includes a lens barrel, a lens group disposed in the lens barrel, and a shading plate. The shading plate is disposed between the two lenses closest to the image side to provide shading for the lenses. However, there is currently a lack of visors that can both meet the mechanical requirements and reduce stray light.

technical solutions

The purpose of the present application is to provide a shading plate and a lens module, which can reduce stray light while meeting the mechanical requirements, improve the optical performance of the lens module, and improve the imaging quality.

The technical solution of the present application is as follows: a light shielding plate is provided, the light shielding plate includes a first main body part and a second main body part that are connected to each other, the first main body part is annular, and the second main body part is located at a In the first body portion ring, the first body portion is opaque to light, the second body portion is opaque to light, and the hardness of the material of the first body portion is greater than the hardness of the material of the second body portion, And the second body part is a polymer material body part with a matte surface.

Further, the second main body part is a plastic main body part, and the material of the first main body part and the second main body part is different.

Further, the second body portion is a plastic ring.

Further, the cross-sectional shape of the second main body part in the axial direction is two axisymmetric triangles.

Further, the first body portion is a metal ring.

Further, the first main body portion includes a first object side surface, a first image side surface disposed opposite to the first object side surface, a first inner side surface connecting the first object side surface and the first image side surface, and a first image side surface. the first outer side;

The first inner side surface includes a first surface and a second surface that are connected, the first surface is connected with the first object side surface, and the second surface is connected with the first image side surface;

The second main body portion includes a second object side surface, a second inner side surface, and a second outer side surface, the second outer side surface coincides with the first surface, and the second object side surface and the first object side surface are located at On the same plane, the second inner surface and the second surface have the same slope in the section along the axial direction.

Further, both the second inner side surface and the second surface are inclined in a direction away from the optical axis, and the projection of the first image side surface is located in the first object side surface.

Further, the first object side surface, the second object side surface, the first image side surface, the first outer side surface, the second inner side surface and the second surface are all matte surfaces.

In addition, the present application also provides a lens module, the lens module includes a lens barrel, a lens group disposed in the lens barrel, and the shading plate according to any one of the above, wherein the lens group includes a plurality of The lenses are stacked in sequence, and the shading plate is arranged between the two lenses closest to the image side.

Further, the lens module further includes a shading sheet, and the shading sheet and the shading plate are arranged between the two lenses closest to the image side.

beneficial effect

The beneficial effect of the present application is that: since the shading plate is formed by connecting the first main body part and the second main body part, and the second main body part is a polymer material main body part with a matte surface, so that the second main body part can be processed by Extinction treatment, thereby effectively reducing the stray light generated by reflection, and the second main body is made of polymer material, so the extinction effect is also better. Moreover, since the hardness of the material of the first main body part is greater than the hardness of the material of the second main body part, the light shielding plate can better meet the mechanical requirements. In addition, both the first main body part and the second main body part are opaque to light, so as to play a role of shielding light.

By arranging the above-mentioned shading plate between the two lenses closest to the image side, it is used to provide shading effect for the lenses. The above-mentioned shading plate can effectively reduce stray light while meeting the mechanical requirements, thereby preventing the lens module from being interfered by stray light, improving the optical performance of the lens module and improving the imaging quality. In addition, the difference between the outer diameters of the two lenses closest to the image side is generally large, and the stability of the overall assembly of the lens module can also be ensured by arranging the above-mentioned shading plate.

Description of drawings

Fig. 1 is the structural schematic diagram of the shading plate of the application;

Fig. 2 is the enlarged view of A place in Fig. 1;

FIG. 3 is a schematic structural diagram of the lens module of the present application.

In the picture:

100. visor;

10. The first main body; 11. The first object side; 12. The first image side; 13. The first inner side; 131, The first side; 132, The second side; 14, The first outer side;

20, the second main body; 21, the second object side; 22, the second inner side; 23, the second outer side;

200, lens barrel;

300, lens;

400, shading sheet;

500. Optical axis.

Embodiments of the present invention

The present application will be further described below with reference to the accompanying drawings and embodiments. As shown in FIG. 1 and FIG. 2 , the present application provides a light shielding plate 100 . The light shielding plate 100 includes a first main body portion 10 and a second main body portion 20 connected to each other. The first main body portion 10 is annular, and the second main body portion 10 is annular. The part 20 is located in the ring of the first body part 10, the first body part 10 is opaque, the second body part 20 is opaque, the hardness of the material of the first body part 10 is greater than the hardness of the material of the second body part 20, and The second body portion 20 is a polymer material body portion having a matte surface.

Since the light shielding plate 100 is formed by connecting the first main body part 10 and the second main body part 20 , and the second main body part 20 is a main body part of polymer material with a matte surface, so that the matting treatment is performed on the second main body part 20 . , so as to effectively reduce the stray light generated by reflection, and the second main body part 20 is made of a polymer material, so the extinction effect is also better. Moreover, since the hardness of the material of the first main body part 10 is greater than the hardness of the material of the second main body part 20 , the light shielding plate 100 can better meet the mechanical requirements. In addition, the first main body portion 10 and the second main body portion 20 are both opaque to light, so as to play a light shielding function.

In this embodiment, the second main body portion 20 is a plastic main body portion, and the first main body portion 10 and the second main body portion 20 are made of different materials. Since the second main body part 20 is made of plastic material, it is not only convenient for matting the second main body part 20 to reduce the glossiness of the surface of the second main body part 20 , thereby reducing stray light, but also reducing the production cost. Of course, in other embodiments, the second body portion 20 includes, but is not limited to, a plastic body portion.

In this embodiment, the second main body portion 20 is a plastic ring. Since the second main body portion 20 made of plastic material is in the shape of an annular shape, the second main body portion 20 can be subjected to a matte treatment to further reduce the stray light generated by reflection, and the matting treatment effect is better. Production and processing of the second main body part 20 and assembly with the first main body part 10 . Of course, in other embodiments, the second main body portion 20 may also be a segment of a fan ring.

Further, in the present embodiment, the cross-sectional shape of the second main body part 20 in the axial direction is two axisymmetric triangles, so as to further facilitate the production and processing of the second main body part 20 while ensuring the extinction effect.

In this embodiment, the first main body portion 10 is a metal ring. Since the second main body part 20 is made of plastic material and the first main body part 10 is made of metal material, it can not only meet the mechanical requirements of the light shielding plate 100, but also lower the production cost. In this embodiment, only the first main body part needs to be guaranteed. The extinction effect of 10 can effectively reduce the stray light. In this way, the light shielding plate 100 can not only satisfy the mechanical requirements, but also solve the problem of stray light. Of course, in other embodiments, the first body portion 10 includes, but is not limited to, a metal ring.

In addition, in this embodiment, the material of the second main body part 20 is plastic, the material of the first main body part 10 is metal, and the first main body part 10 and the second main body part 20 are integrally injection-molded, which is convenient for the production and processing of the shading plate 100 . Of course, in other embodiments, the first main body portion 10 and the second main body portion 20 may also be assembled in other ways.

In this embodiment, the first main body portion 10 includes a first object side surface 11 , a first image side surface 12 disposed opposite to the first object side surface 11 , and a first inner side surface connecting the first object side surface 11 and the first image side surface 12 13 and the first outer side 14, the first inner side 13 includes a first side 131 and a second side 132 connected to each other, the first side 131 is connected with the first object side 11, and the second side 132 is connected with the first image side 12 , the second main body portion 20 includes a second object side surface 21, a second inner side surface 22 and a second outer side surface 23, the second outer side surface 23 and the first surface 131 are overlapped, and the second object side surface 21 and the first object side surface 11 are located at On the same plane, the slopes of the second inner surface 22 and the second surface 132 in the section along the axial direction are the same. The light incident on the light shielding plate 100 from the object side may be incident on the first object side 11 , the first image side 12 , the second side 132 , the first outer side 14 , the second object side 21 or the second inner side 22 The reflected light formed on the second inner side surface 22 is most likely to reach the imaging area and affect the imaging effect. Therefore, the second main body portion 20 is overlapped with the second outer side surface 23 and the first surface 131 to realize the The connection of the main body portion 10 enables the second inner side surface 22 of the light shielding plate 100 to minimize the stray light that interferes with the imaging effect. In addition, the second object side surface 21 and the first object side surface 11 are located on the same plane, and the second inner side surface 22 and the second surface 132 have the same slope in the section along the axial direction, which can better reduce the interference of stray light on the one hand. , has a good shading effect, and on the other hand makes the shading plate 100 look more beautiful as a whole.

Further, in this embodiment, both the second inner side surface 22 and the second surface 132 are inclined toward the direction away from the optical axis 500 , and the projection of the first image side surface 12 is located in the first object side surface 11 . Specifically, in this embodiment, the first surface 131 extends from the object side in the direction of the optical axis 500 , and the second surface 132 extends from the edge of the first surface 131 to the first image side 12 away from the optical axis 500 . In this way, the above-mentioned shading plate 100 not only has a certain shading effect, but also facilitates the propagation and entry of light, so as to avoid excessive shading and affect the optical performance.

It is worth mentioning that, in this embodiment, the second object side surface 21 and the second inner side surface 22 are both matte surfaces. Both the second object side surface 21 and the second inner side surface 22 of the second main body part 20 are subjected to matting treatment to reduce the glossiness of each surface of the second main body part 20 to further reduce stray light and improve optical performance. Of course, in other embodiments, only one of the second object side surface 21 and the second inner side surface 22 may be a matte surface.

As shown in FIG. 1 to FIG. 3 , the present application further provides a lens module including the above-mentioned shading plate 100 , the lens module further includes a lens barrel 200 and a lens group disposed in the lens barrel 200 , and the lens group includes a plurality of sequentially The lenses 300 are stacked, and the shading plate 100 is arranged between the two lenses 300 closest to the image side.

The above-mentioned light shielding plate 100 is provided between the two lenses 300 closest to the image side, so as to provide the lens 300 with a light shielding effect. The above-mentioned shading plate 100 can effectively reduce stray light while meeting the mechanical requirements, thereby preventing the lens module from being interfered by stray light, improving the optical performance of the lens module and improving the imaging quality. In addition, the difference in outer diameter of the two lenses 300 closest to the image side is generally large, and the stability of the overall assembly of the lens module can also be ensured by arranging the above-mentioned shading plate 100 .

It should be noted that, in this embodiment, the lens group includes a first lens 300 , a second lens 300 , a third lens 300 , a fourth lens 300 , a fifth lens 300 , a first lens 300 , a fifth lens 300 , In the six lenses 300 , the shading plate 100 is disposed between the fifth lens 300 and the sixth lens 300 and abuts against the inner wall of the lens barrel 200 . Since the outer diameter of the fifth lens 300 and the sixth lens 300 is quite different, by disposing the shading plate 100 between the fifth lens 300 and the sixth lens 300, not only a good shading effect can be satisfied, but also the overall assembly of the lens module can be ensured stability. Of course, in other embodiments, the number of lenses 300 may also be four, five, eight, etc., which may be selected and set according to different requirements.

Since the light outside the lens barrel 200 is incident into the lens barrel 200 from the object side, and is easily reflected in the lens barrel 200 to form stray light, the first main body part is arranged between the fifth mirror 300 and the sixth mirror 300 10 and the second main body part 20 are connected to form the shading plate 100, and the second main body part 20 is made of plastic material to ensure a good extinction effect, effectively reduce stray light, and avoid the interference of stray light inside the lens barrel 200 , so as to improve the optical performance of the lens module and improve the image quality. Moreover, the first main body portion 10 is made of metal material to meet the mechanical requirements of the light shielding plate 100 .

In this embodiment, the lens module further includes a shading sheet 400 , and the shading sheet 400 and the shading plate 100 are disposed between the fifth lens 300 and the sixth lens 300 . By arranging the shading sheet 400, the shading sheet 400 and the shading plate 100 together play a shading function, so as to ensure the optical performance of the camera module and avoid stray light.

The above are only the embodiments of the present application. It should be pointed out that for those of ordinary skill in the art, improvements can be made without departing from the creative concept of the present application, but these belong to the present application. scope of protection.

Claims

A light shielding plate, characterized in that the light shielding plate includes a first main body part and a second main body part that are connected to each other, the first main body part is annular, and the second main body part is located on the first main body In the ring, the first main body part is opaque to light, the second main body part is opaque to light, the hardness of the material of the first main body part is greater than the hardness of the material of the second main body part, and the The two main body parts are polymer material main body parts with matte surfaces.
The light shielding plate according to claim 1, wherein the second main body part is a plastic main body part, and the first main body part and the second main body part have different materials.
The light shielding plate according to claim 2, wherein the second main body portion is a plastic ring.
The light shielding plate according to claim 3, wherein the cross-sectional shape of the second main body part along the axial direction is two axisymmetric triangles.
The light shielding plate according to any one of claims 2 to 4, wherein the first main body portion is a metal ring.
The light shielding plate according to claim 1, wherein the first main body portion comprises a first object side surface, a first image side surface disposed opposite to the first object side surface, and a first object side surface connecting the first object side surface and the first object side surface. Describe the first inner side and the first outer side of the first image side surface;

The first inner side surface includes a first surface and a second surface that are connected, the first surface is connected with the first object side surface, and the second surface is connected with the first image side surface;

The second main body portion includes a second object side surface, a second inner side surface, and a second outer side surface, the second outer side surface coincides with the first surface, and the second object side surface and the first object side surface are located at On the same plane, the second inner surface and the second surface have the same slope in the section along the axial direction.
The light shielding plate according to claim 6, wherein the second inner side surface and the second surface are both inclined in a direction away from the optical axis, and the projection of the first image side surface is located in the first object side surface .
The light shielding plate according to claim 6 or 7, wherein the second object side surface and the second inner side surface are both matte surfaces.
A lens module, characterized in that the lens module includes a lens barrel, a lens group disposed in the lens barrel, and the shading plate according to any one of claims 1 to 8, and the lens group includes A plurality of lenses are stacked in sequence, and the shading plate is arranged between the two lenses closest to the image side.
The lens module according to claim 9, wherein the lens module further comprises a shading sheet, and the shading sheet and the shading plate are arranged between the two lenses closest to the image side.