WO2021000204A1

WO2021000204A1 - Lens module

Info

Publication number: WO2021000204A1
Application number: PCT/CN2019/094104
Authority: WO
Inventors: 韦传冬
Original assignee: 瑞声光学解决方案私人有限公司
Priority date: 2019-06-30
Filing date: 2019-06-30
Publication date: 2021-01-07
Also published as: CN210776119U

Abstract

A lens module (100), comprising: a lens barrel (1); and a lens group (2) and a compression ring (3) accommodated in an accommodation chamber (10) of the lens barrel (1). The lens group (2) comprises a first lens (21) located closest to an image side, and the compression ring (3) abuts a first image side surface (215) of the first lens (21). The compression ring (3) comprises a second object side surface (34), a second image side surface (35) disposed opposite the second object side surface (34), and a second wall portion (36) connected between the second object side surface (34) and the second image side surface (35). The second wall portion (36) comprises an outer side wall (361) located away from an optical axis (OO') and an inner side wall (362) opposite the outer side wall (361). In the lens module (100), the inner side wall (362) of the compression ring (3) is configured to be a slope when viewed in a cross-section parallel to the optical axis (OO'), so as to increase the contact area between stray light and the inner side wall (362), and the inner side wall (362) is configured to be inclined toward the optical axis (OO') along a direction from the object side to the image side, so as to directly block the stray light incident on the inner side wall (362) from entering an imaging region, and to reflect the stray light back to facilitate scattering or diffusion, thereby reducing the stray light in the lens barrel (1) and improving the imaging quality of the lens module (100).

Description

Lens module

Technical field

This application relates to the field of optical imaging technology, and in particular to a lens module.

Background technique

With the continuous development of technology, electronic devices continue to develop towards intelligence. In addition to digital cameras, portable electronic devices such as tablets and mobile phones are also equipped with lens modules with camera functions to meet the needs of users to take photos at any time. .

The related art lens module includes a lens barrel, a lens group arranged in the lens barrel, and a pressing ring abutting on the image side of the lens group.

However, in the related art, the lens module is prone to generate stray light during the imaging process, and the stray light easily interferes with the lens module, and ultimately causes the imaging quality to be greatly affected.

Therefore, it is necessary to provide a new type of lens module.

technical problem

The purpose of this application is to provide a lens module to solve the technical problem that the lens module is easily interfered by stray light and causes poor imaging quality in the prior art.

Technical solutions

In order to achieve the above objective, this application provides a lens module, including:

The lens barrel has an optical axis and a receiving cavity through which the self-image side penetrates the object side;

The lens group is accommodated in the accommodating cavity of the lens barrel, and the lens group includes a first lens closest to the image side, wherein the first lens includes a first object side surface and is located on the optical axis A first image side surface disposed opposite to the first object side surface in the direction of, and a first wall portion connecting the first object side surface and the first image side surface and connected to the cavity wall of the receiving cavity; and

A pressing ring is received in the receiving cavity of the lens barrel and abuts against the first image side surface of the first lens; wherein the pressing ring includes a second object side surface and the second object side surface Oppositely arranged second image side surface and a second wall portion connecting the second object side surface and the second image side surface. The second wall portion includes an outer side wall away from the optical axis and an outer side wall opposite to the outer side wall. Inner wall

The inner side wall is a slope in a cross section parallel to the optical axis, and in a direction from the second object side surface to the second image side surface, the inner side wall is inclined in a direction close to the optical axis.

As an improvement, one of the first image side surface of the first lens and the second object side surface of the pressure ring is provided with an annular groove, and the other is provided with the annular groove Adapted annular projection.

As an improvement, the annular groove is provided on the first image side surface of the first lens;

The annular protrusion is arranged on the side surface of the second object of the pressure ring.

As an improvement, in the direction from the object side to the image side:

The second object side surface of the pressure ring includes a pressure ring convex surface located at the free end of the annular protrusion, a pressure ring concave surface located inside the pressure ring convex surface, and a pressure ring connecting the pressure ring convex surface and the pressure ring concave surface. Ring bevel

The first image side surface of the first lens includes a concave lens surface at the bottom of the annular groove, a convex lens surface located outside the concave surface of the lens, and a lens slope connecting the concave surface of the lens and the convex surface of the lens, wherein The concave surface of the lens, the inclined surface of the lens, and the convex surface of the lens are respectively matched with the convex surface of the pressure ring, the inclined surface of the pressure ring and the concave surface of the pressure ring.

As an improvement, at least one pair of the concave surface of the lens and the convex surface of the pressure ring, the slope of the lens and the slope of the pressure ring, and the convex surface of the lens and the concave surface of the pressure ring bear each other.

... As an improvement, the concave surface of the lens receives the convex surface of the pressure ring, the slope of the lens receives the slope of the pressure ring, and the convex surface of the lens is spaced apart from the concave surface of the pressure ring.

As an improvement, there is a gap between the pressure ring and the lens barrel and the two are fixed by fixing glue, and the fixing glue is filled into the gap between the convex surface of the lens and the concave surface of the pressure ring .

As an improvement, the concave surface of the lens and the convex surface of the pressure ring are received or spaced apart, the beveled lens surface is received by the beveled pressure ring, and the convex surface of the lens is received by the concave surface of the pressure ring.

As an improvement, the lens slant surface and the pressure ring slant surface are spaced apart, and at least one pair of the lens concave surface and the pressure ring convex surface, and the lens convex surface and the pressure ring concave surface are mutually supported and arranged.

As an improvement, the pressure ring and the lens barrel are fixedly connected by a tight fit, or there is a gap between the pressure ring and the lens barrel and the two are fixed by a fixing glue.

Beneficial effect

The beneficial effect of the present application is that the inner side wall of the pressure ring of the lens module is set as an inclined plane in the section parallel to the optical axis, thereby increasing the contact area between the stray light and the inner side wall, and from the object side to the image In the direction of the side, the inner side wall is set to a structure with a gradually decreasing radius, that is, the light interception point is set at the image side end of the pressure ring, so that when the light outside the lens barrel passes through the pressure ring, it directly blocks the inside The stray light on the wall enters the imaging area and reflects the stray light back to achieve effects such as scattering or diffusion, thereby reducing the generation of stray light in the lens barrel and improving the imaging quality of the lens module.

Description of the drawings

FIG. 1 is a schematic cross-sectional view of the lens module in the first embodiment of the present application;

2 is a schematic cross-sectional view of the lens module in the second embodiment of the present application;

3 is a schematic cross-sectional view of the lens module in the third embodiment of the present application;

4 is a schematic cross-sectional view of the lens module in the fourth embodiment of the present application;

5 is a schematic cross-sectional view of the lens module in the fifth embodiment of the present application;

6 is a schematic cross-sectional view of a lens module in a sixth embodiment of the present application;

7 is a schematic cross-sectional view of the lens module in the seventh embodiment of the present application;

8 is a schematic cross-sectional view of a lens module in an eighth embodiment of the present application;

9 is a schematic cross-sectional view of a lens module in a ninth embodiment of the present application.

Among them, the labels in the drawings are as follows:

100. Lens module; OO’, optical axis;

1. Mirror tube; 10. Containment cavity;

2. Lens group; 21, first lens; 210, annular groove; 211, concave lens surface; 212, convex lens surface; 213, lens oblique surface; 214, first object side; 215, first image side; 216, first Wall part; 22, second lens; 23, third lens; 24, fourth lens; 25, fifth lens;

3. Pressure ring; 30, annular protrusion; 31, convex surface of pressure ring; 32, concave surface of pressure ring; 33, slope of pressure ring; 34, side of second object; 35, side of second image; 36, second wall; 361. Outer side wall; 362. Inner side wall;

4. Solid glue.

Embodiments of the invention

The application will be described in detail below with reference to the drawings and embodiments.

As shown in FIGS. 1 and 2, the lens module 100 of the present application includes a lens barrel 1, a lens group 2 and a pressure ring 3.

The lens barrel 1 is substantially cylindrical, and the lens barrel 1 has an optical axis OO' and a receiving cavity 10 penetrating the object side from the self-image side, and specifically, the receiving cavity 10 of the lens barrel 1 is multiple The steps are arranged to form a step portion for mounting the lenses of the lens group 2, wherein the specific number of steps can be determined according to the actual number of lenses of the lens group 2 installed and other circumstances. Further, to simplify the structure, the number of steps is usually the same as the number of lenses.

As shown in FIG. 1, the lens group 2 is contained in the housing cavity 10 of the lens barrel 1, and the lens group 2 includes the first lens 21 closest to the image side (that is, the object in the lens group 2). The lens located at the lowest end in the direction from the side to the image side), wherein the first lens 21 includes a first object side surface 214 and a first image side surface 215 disposed opposite to the first object side surface 214 in the direction of the optical axis OO′ . In addition, usually, the first lens 21 further includes a first wall portion 216 connecting the first object side surface 214 and the first image side surface 215, wherein the first wall portion 216 is connected to the cavity wall of the receiving cavity 10 of the lens barrel 1 Abutting or bonding through glue.

In addition, the lens group 2 usually further includes a second lens 22, a third lens 23, a fourth lens 24, and a second lens 22, a third lens 23, a fourth lens 24, and a The fifth lens 25 is obviously not limited to this design. In practical applications, the number of lenses specifically included in the lens group 2 is not limited. To facilitate the introduction of this application, the structure of the lens group 2 with 5 lenses is used as an example for description.

Generally, the pressure ring 3 is arranged in a hollow ring shape, the pressure ring 3 is received in the receiving cavity 10 of the lens barrel 1, and the pressure ring 3 includes a second object side surface 34 and a second object side surface. 34. A second image side 35 opposite to the second image side 35 and a second wall 36 connecting the second object side 34 and the second image side 35. The second wall 36 includes an outer side wall 361 away from the optical axis OO' And an inner side wall 362 disposed opposite to the outer side wall 361.

The outer side wall 361 abuts against the cavity wall of the receiving cavity 10. Usually, the pressing ring 3 is fixedly connected to the lens barrel 1 through a tight fit between the pressing ring 3 and the cavity wall of the receiving cavity 10. Of course, in fact, other suitable methods can also be used to install the pressing ring 3 into the lens barrel 1.

In the present application, as shown in FIGS. 1-9, the inner side wall 362 of the pressure ring 3 is inclined in a section parallel to the optical axis OO', so that when the light outside the lens barrel 1 passes through When the ring 3 is pressed, the contact area between these lights and the inner side wall 362 of the pressing ring 3 can be increased. In addition, taking the structure shown in FIG. 1 as an example for description, in the direction from the second object side 34 to the second image side 35 of the pressure ring 3, the inner side wall 362 is inclined toward the optical axis OO'. Understandably, the radius of the inner side wall 362 of the pressure ring 3 close to the second image side 35 is smaller than the radius of the inner side wall 362 of the pressure ring 3 close to the second object side 34, that is, the light interception point is set at the pressure Image side end of ring 3. In this way, when the light outside the lens barrel 1 passes through the pressure ring 3, it can be directly blocked and reflected back on the inner side wall 362, or be scattered or diffused at the intercept point, thereby weakening the stray light to image The impact of quality.

In addition, in this embodiment, the fixing method of the pressing ring 3 and the lens barrel 1 is not limited, and it may be the pressing ring 3 and the lens as shown in FIGS. 4 to 6 or 7 to 9 The lens barrel 1 is fixed by a tight fit. Specifically, the outer diameter of the pressure ring 3 is slightly larger than the inner diameter of the corresponding part of the lens barrel 1, so that the pressure ring 3 interferes with the lens barrel 1, so as to connect the pressure ring 3 and the lens barrel 1. The lens barrel 1 is fixedly connected, or, as shown in FIG. 1, there is a gap between the pressing ring 3 and the lens barrel 1 and the two are fixedly bonded by a glue such as a fixing glue 4 or glue.

The pressure ring 3 abuts against the first image side surface 215 of the first lens 21, and the first image side surface 215 of the first lens 21 and the second object side surface of the pressure ring 3 34. One of the two is provided with an annular groove 210, and the other is provided with an annular protrusion 30 adapted to the annular groove 210. Specifically, as shown in Figures 1 and 2, in the embodiment of the present application, the annular groove 210 is provided on the first image side surface 215 of the first lens 21, and the annular protrusion 30 is provided on the The second object side 34 of the pressure ring 3. Through the cooperation of the annular protrusion 30 and the annular groove 210, the fixing effect of the pressing ring 3 on the lens group 2, specifically the first lens 21, can be enhanced, thereby improving the stability of the entire lens module 100.

Further, as shown in FIG. 1, in the direction from the object side to the image side of the lens module 100: the second object side 34 of the pressure ring 3 includes a pressure at the free end of the annular protrusion 30 A ring convex surface 31, a pressing ring concave surface 32 located inside the pressing ring convex surface 31, and a pressing ring inclined surface 33 connecting the pressing ring convex surface 31 and the pressing ring concave surface 32. Understandably, in the direction from the second object side surface 34 to the second image side surface 35, the pressure ring convex surface 31, the pressure ring inclined surface 33, and the pressure ring concave surface 32 are connected end to end. The aforementioned annular protrusion 30 is formed.

Correspondingly, the first image side surface 215 of the first lens 21 includes a lens concave surface 211 at the bottom of the annular groove 210, a lens convex surface 212 located outside the lens concave surface 211, and a lens connecting the lens concave surface 211 and the lens concave surface 211. The lens slope 213 of the lens convex surface 212. Understandably, in the direction from the first object side surface 214 to the first image side surface 215, the lens concave surface 211, the lens bevel surface 213 and the lens convex surface 212 are connected end to end to form the aforementioned Ring groove 210.

Wherein, when the above-mentioned annular protrusion 30 and the above-mentioned annular groove 210 are matched, specifically, the lens concave surface 211, the lens inclined surface 213, and the lens convex surface 212 are connected to the pressure ring convex surface 31 and the pressure ring respectively. The inclined surface 33 and the concave surface 32 of the pressure ring are correspondingly adapted. More specifically, at least one pair of the lens concave surface 211 and the pressing ring convex surface 31, the lens inclined surface 213 and the pressing ring inclined surface 33, and the lens convex surface 212 and the pressing ring concave surface 32 receive each other to This makes the annular protrusion 30 and the annular groove 210 complete the fit.

Hereinafter, in conjunction with FIGS. 1 to 9, it will be further described that the above-mentioned concave lens surface 211, the lens inclined surface 213, and the convex lens surface 212 correspond to the corresponding pressing ring convex surface 31, the pressing ring inclined surface 33 and the pressing ring concave surface 32. The specific adaptation conditions between the devices are as follows:

Please refer to FIG. 1, in the first embodiment of the present application, the lens concave surface 211 is received by the pressure ring convex surface 31, the lens bevel surface 213 is received by the pressure ring bevel 33, and the lens convex surface 212 is The concave surfaces 32 of the pressing ring are arranged at intervals, and further, there is a gap between the pressing ring 3 and the lens barrel 1 and the two are bonded and fixed by an adhesive such as a fixing glue 4 or glue, and the fixing glue 4 is filled into the gap between the convex surface 212 of the lens and the concave surface 32 of the pressing ring. In this way, the fixing effect between the pressure ring 3 and the first lens 21 can be further enhanced, and the structural stability of the lens module 100 can be improved.

Please refer to FIG. 2. In the second embodiment of the present application, or refer to FIG. 5, in the fifth embodiment of the present application, the concave surface 211 of the lens and the convex surface 31 of the pressing ring are received or spaced apart. The inclined surface 213 receives the pressure ring inclined surface 33, and the lens convex surface 212 receives the pressure ring concave surface 32.

Please refer to FIG. 3, in the third embodiment of the present application, or refer to FIG. 6, in the sixth embodiment of the present application, the concave lens surface 211 and the convex surface 31 of the pressing ring are spaced apart, and the lens inclined surface 213 The lens convex surface 212 is received by the pressure ring inclined surface 33, and the lens convex surface 212 is received by the pressure ring concave surface 32.

Referring to FIGS. 7-9, in the seventh, eighth, and ninth embodiments of the present application, the lens slant surface 213 is spaced apart from the pressure ring slant surface 33, and the lens concave surface 211 At least one pair of the convex surface 31 of the pressing ring, the convex surface 212 of the lens, and the concave surface 32 of the pressing ring are arranged to be mutually received.

Specifically, please refer to FIG. 7. In the seventh embodiment of the present application, the lens slant surface 213 and the pressure ring slant surface 33 are spaced apart, the lens concave surface 211 and the pressure ring convex surface 31 receive, and the lens The convex surface 212 is spaced apart from the concave surface 32 of the pressure ring.

Specifically, please refer to FIG. 8. In the eighth embodiment of the present application, the lens slope 213 and the pressure ring slope 33 are spaced apart, the lens concave surface 211 and the pressure ring convex surface 31 receive, and the lens The convex surface 212 receives the concave surface 32 of the pressure ring.

Specifically, please refer to FIG. 9. In the ninth embodiment of the present application, the lens slant surface 213 and the pressure ring slant surface 33 are spaced apart, and the lens concave surface 211 and the pressure ring convex surface 31 are spaced apart. The convex surface 212 of the lens receives the concave surface 32 of the pressing ring.

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

Claims

A lens module, characterized by comprising:

The lens barrel has an optical axis and a receiving cavity through which the self-image side penetrates the object side;

The lens group is accommodated in the accommodating cavity of the lens barrel, and the lens group includes a first lens closest to the image side, wherein the first lens includes a first object side surface and is located on the optical axis A first image side surface disposed opposite to the first object side surface in the direction of, and a first wall portion connecting the first object side surface and the first image side surface and connected to the cavity wall of the receiving cavity; and

A pressing ring is received in the receiving cavity of the lens barrel and abuts against the first image side surface of the first lens; wherein the pressing ring includes a second object side surface and the second object side surface Oppositely arranged second image side surface and a second wall portion connecting the second object side surface and the second image side surface. The second wall portion includes an outer side wall away from the optical axis and an outer side wall opposite to the outer side wall. Inner wall

The inner side wall is a slope in a cross section parallel to the optical axis, and in a direction from the second object side surface to the second image side surface, the inner side wall is inclined in a direction close to the optical axis.
The lens module according to claim 1, wherein one of the first image side surface of the first lens and the second object side surface of the pressure ring is provided with an annular groove, The other is provided with an annular protrusion adapted to the annular groove.
The lens module according to claim 2, wherein the annular groove is provided on the first image side surface of the first lens;

The annular protrusion is arranged on the side surface of the second object of the pressure ring.
The lens module of claim 3, wherein in the direction from the object side to the image side:

The second object side surface of the pressure ring includes a pressure ring convex surface located at the free end of the annular protrusion, a pressure ring concave surface located inside the pressure ring convex surface, and a pressure ring connecting the pressure ring convex surface and the pressure ring concave surface. Ring bevel

The first image side surface of the first lens includes a concave lens surface at the bottom of the annular groove, a convex lens surface located outside the concave surface of the lens, and a lens slope connecting the concave surface of the lens and the convex surface of the lens, wherein The concave surface of the lens, the inclined surface of the lens, and the convex surface of the lens are respectively matched with the convex surface of the pressure ring, the inclined surface of the pressure ring and the concave surface of the pressure ring.
The lens module of claim 4, wherein at least one of the concave surface of the lens and the convex surface of the pressing ring, the inclined surface of the lens and the inclined surface of the pressing ring, and the convex surface of the lens and the concave surface of the pressing ring are at least one To undertake each other.
The lens module of claim 5, wherein the concave surface of the lens receives the convex surface of the pressure ring, the slope of the lens receives the slope of the pressure ring, and the convex surface of the lens is spaced from the concave surface of the pressure ring. Set up.
The lens module according to claim 6, wherein there is a gap between the pressure ring and the lens barrel and the two are fixed by a fixing glue, and the fixing glue is filled to the convex surface of the lens and the lens barrel. In the gap between the concave surfaces of the pressure ring.
The lens module according to claim 5, wherein the concave surface of the lens and the convex surface of the pressing ring are received or spaced apart, the inclined surface of the lens is received by the inclined surface of the pressing ring, and the convex surface of the lens is connected to the pressing ring. The ring concave surface accepts.
The lens module according to claim 5, wherein the lens slope and the pressure ring slope are spaced apart, the lens concave surface and the pressure ring convex surface, and the lens convex surface and the pressure ring concave surface At least one pair of the two sets up mutually.
The lens module according to claim 1, wherein the pressure ring and the lens barrel are fixedly connected by a tight fit, or there is a gap between the pressure ring and the lens barrel and there is a gap between them. The fixing glue is fixed.