WO2022104910A1

WO2022104910A1 - Lens module

Info

Publication number: WO2022104910A1
Application number: PCT/CN2020/133076
Authority: WO
Inventors: 王海龙
Original assignee: 诚瑞光学(深圳)有限公司
Priority date: 2020-11-23
Filing date: 2020-12-01
Publication date: 2022-05-27
Also published as: CN212181219U

Abstract

A lens module (100), comprising a lens barrel (10) with an accommodating space (101), and a lens group (20) accommodated in the accommodating space (101). The lens group (20) comprises a first lens (21) located on an object side; the first lens (21) comprises an optical portion (211) used for imaging and a bearing portion (212) arranged around the optical portion (211); the bearing portion (212) comprises a top face (213) close to the object side; and the optical portion (211) comprises an object-side face (214) close to the object side, and a side surface (215) by means of which the object-side face (214) and the top face (213) are connected to each other, the side surface (215) being coated with a light absorption layer (30). In the lens module (100), the side surface (215) is coated with the light absorption layer (30), the light absorption layer (30) can absorb most of light irradiated on the side surface (215), and stray light is effectively reduced, such that the imaging quality of the lens module (100) is improved.

Description

lens module

technical field

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

Background technique

The lens module is an essential part of electronic equipment (such as mobile phones). In some ultra-small head lens modules, due to structural limitations, the first lens has a large side surface, and when the light hits the side surface, it will form clutter. Astigmatism affects the image quality of the lens module.

Therefore, it is necessary to study a new type of lens module to solve the above problems.

technical problem

In some ultra-small head lens modules, due to structural limitations, the first lens element has a larger side surface, and when light irradiates the side surface, stray light will be formed, which affects the imaging quality of the lens module.

technical solutions

The purpose of the present application is to provide a lens module, the first lens of the lens module generates less stray light, and the imaging quality of the lens module is high.

The purpose of the present application is achieved by the following technical solutions: a lens module, comprising a lens barrel with an accommodation space and a lens group accommodated in the accommodation space, the lens group including a first lens on the object side, the The first lens includes an optical part for imaging and a bearing part arranged around the optical part, the bearing part includes a top surface close to the object side, the optical part includes an object side surface close to the object side and connecting the object side surface and the side surface of the top surface, the side surface is coated with a light absorbing layer.

As an improved manner, the bearing portion protrudes away from the optical axis in a direction perpendicular to the optical axis from the end of the optical portion close to the image side.

As an improvement, the optical part includes a first part close to the object side and a second part protruding toward the image side from an end of the first part close to the image side, the bearing part is close to the image side from the second part One end of the lens barrel protrudes away from the optical axis along a direction perpendicular to the optical axis.

As an improvement, the lens barrel includes a top wall with a light-transmitting hole and a barrel wall extending from the top wall toward the image side, and the barrel wall includes an inner surface that encloses the receiving space and is The inner surface is opposite to the outer surface, the inner surface is recessed away from the optical axis to form a step portion corresponding to the position of the bearing portion, and the bearing portion at least partially abuts the step portion.

As an improvement, the inner surface includes a first surface extending obliquely from the top wall to the image side, a second surface extending away from the optical axis from an end of the first surface close to the image side, and a second surface extending away from the optical axis from the end of the first surface. A third surface extending from the end of the second surface away from the optical axis toward the image side and a fourth surface bending and extending from the end of the third surface close to the image side toward the image side, the second surface and the first surface The three surfaces enclose the step portion, and the top surface is attached and fixed to the second surface.

As an improvement, the top wall includes an upper surface on the object side, a first inclined surface extending obliquely from an end of the upper surface close to the optical axis to a direction close to the optical axis, and the first inclined surface a second slope extending obliquely from the end close to the image side to the direction away from the optical axis and a side surface extending from the end of the upper surface away from the optical axis to the image side and connected to the outer surface, the first The surface extends from the end of the second inclined plane away from the optical axis to the image side and is enclosed with the second inclined plane to form a receiving part, the first part is completely contained in the receiving part, and the second part is completely contained in the receiving part. One end of the first part close to the image side protrudes toward the image side and is located outside the accommodating part.

As an improvement, the side surface is an inclined surface, and the side surface extends obliquely from the top surface in a direction close to the optical axis.

As an improvement, the object side surface is an arc surface, and the object side surface is convex toward the object side direction.

As an improvement, the lens group further includes at least one lens disposed on the image side of the first lens, and the lens module further includes a shading sheet and/or a shading plate sandwiched between the adjacent lenses a plate and a pressing ring which is pressed and arranged on one end of the lens group close to the image side.

As an improvement, the lens group includes a second lens, a third lens, a fourth lens, and a fifth lens that are arranged on the image side of the first lens and are stacked in sequence, and the lens module further includes a clamped lens A first shading sheet between the first lens and the second lens, a second shading sheet sandwiched between the second lens and the third lens, and sandwiched between the third lens a third shading sheet between the fourth lens and the fourth lens, a fourth shading sheet sandwiched between the fourth lens and the fifth lens, and a fourth shading sheet sandwiched between the fourth lens and the fourth shading The shading plate between the lenses, the pressing ring is arranged on the image side of the fifth lens and abuts with the lens barrel.

beneficial effect

Compared with the prior art, in the embodiment of the present application, by coating a light-absorbing layer on the side surface of the first lens, the light-absorbing layer can absorb most of the light irradiated on the side surface, effectively reducing the generation of stray light, and improving the performance of the lens module. image quality.

Description of drawings

FIG. 1 is a schematic structural diagram of a lens module provided by an embodiment of the present application.

FIG. 2 is a schematic structural diagram of a first lens and a light absorbing layer provided in an embodiment of the present application.

FIG. 3 is a schematic structural diagram of a lens barrel provided by an embodiment of the present application.

FIG. 4 is a partial enlarged schematic view of the part A in FIG. 3 .

Embodiments of the present invention

The present application will be further described below with reference to the accompanying drawings and embodiments.

It should be noted that all directional indications (such as up, down, left, right, front, back, inside, outside, top, bottom...) in the embodiments of the present application are only used to explain the As shown in the figure), the relative positional relationship between the components, etc., if the specific posture changes, the directional indication also changes accordingly.

It should also be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

As shown in FIGS. 1-4 , an embodiment of the present application provides a lens module 100 , which includes a lens barrel 10 having an accommodation space 101 and a lens assembly 20 accommodated in the accommodation space 101 . The lens assembly 20 has an optical axis L, The lens set 20 includes a first lens 21 on the object side, the first lens 21 includes an optical part 211 for imaging and a bearing part 212 arranged around the optical part 211 , the bearing part 212 includes a top surface 213 close to the object side, the optical part 211 includes an object side surface 214 close to the object side and a side surface 215 connecting the object side surface 214 and the top surface 213 , and the side surface 215 is coated with the light absorbing layer 30 . By coating the light absorbing layer 30 on the side surface 215 , the light absorbing layer 30 can absorb most of the light irradiated on the side surface 215 , effectively reducing the generation of stray light and improving the imaging quality of the lens module 100 . Optionally, the light absorbing layer 30 may be carbon black, graphite or black paint or the like.

In some embodiments, the bearing portion 212 protrudes away from the optical axis L along a direction perpendicular to the optical axis L from the end of the optical portion 211 close to the image side.

In some embodiments, the optical portion 211 includes a first portion 2111 close to the object side and a second portion 2112 protruding toward the image side from an end of the first portion 2111 close to the image side, and the bearing portion 212 is close to the lens barrel 10 from the second portion 2112 One end of the lens protrudes away from the optical axis L along the direction perpendicular to the optical axis L.

In some embodiments, the side surface 215 is an inclined surface, and the side surface 215 extends obliquely from the top surface 213 to a direction close to the optical axis L.

In some embodiments, the object side surface 214 is an arc surface, and the object side surface 214 is convex toward the object side direction.

In some embodiments, the optical part 211 further includes an image side surface 216 close to the image side, the image side surface 216 is an arc surface, and the image side surface 216 is convex toward the image side direction.

In some embodiments, the lens barrel 10 includes a top wall 11 provided with a light-transmitting hole 102 and a barrel wall 12 extending from the top wall 11 toward the image side. The inner surface 121 is opposite to the outer surface 124 . The inner surface 121 is recessed away from the optical axis L corresponding to the position of the bearing portion 212 to form a stepped portion 122 . in the receiving space 101 of the lens barrel 10 .

In some embodiments, the inner surface 121 includes a first surface 1211 extending obliquely from the top wall 11 to the image side, a second surface 1212 extending away from the optical axis L from an end of the first surface 1211 close to the image side, The end of the two surfaces 1212 away from the optical axis L is a third surface 1213 extending toward the image side and a fourth surface 1214 bent and extending from the end of the third surface 1213 close to the image side toward the image side. The second surface 1212 and the third surface 1213 surrounds the step portion 122 , and the top surface 213 of the bearing portion 212 is attached and fixed to the second surface 1212 .

In this embodiment, the top wall 11 includes an upper surface 111 on the object side, a first inclined surface 112 extending obliquely from an end of the upper surface 111 close to the optical axis L toward the optical axis L, and from the first inclined surface 112 close to the image side The second inclined surface 113 with one end extending obliquely away from the optical axis L and the side surface 114 extending toward the image side from the end of the upper surface 111 away from the optical axis L and connected to the outer surface 124 , the first surface 1211 is away from the second inclined surface 113 One end of the optical axis L extends toward the image side and is enclosed with the second inclined surface 113 to form a receiving portion 123 . The first portion 2111 of the optical portion 211 is completely received in the receiving portion 123 , and the second portion 2112 is from the end of the first portion 2111 close to the image side. It protrudes toward the image side and is located outside the accommodating portion 123 . In this embodiment, the second inclined surface 113 can form a concave outward expansion space in the direction away from the optical axis L, which can reduce the amount of light irradiated on the second inclined surface 113 to reduce the amount of stray light caused by reflection. The first inclined surface 112 The stray light generated by reflection can be prevented from entering the imaging system, and the imaging quality of the lens module 100 can be further improved.

In some embodiments, the first inclined surface 112 may be configured to include two or more inclined surfaces with different inclinations connected in sequence. The second inclined surface 113 may also be configured to include two or more inclined surfaces with different inclinations connected in sequence.

In some embodiments, the lens group 20 further includes at least one lens disposed on the image side of the first lens 21 , and the lens module 100 further includes a shading sheet and/or a shading plate sandwiched between adjacent lenses, and The pressure ring at one end of the lens group 20 close to the image side, the shading sheet and the shading plate both cover the edge part of the lens close to the lens barrel, and the shading sheet and the shading plate between the adjacent lenses make the adjacent lenses maintain a proper distance while further. Avoid the generation of stray light caused by the reflection of light between adjacent lenses, and avoid the influence of stray light on the imaging performance of the lens module.

Optionally, in this embodiment, the lens group 20 further includes a second lens 22 , a third lens 23 , a fourth lens 24 and a fifth lens 25 which are disposed on the image side of the first lens 21 and are stacked in sequence. It should be noted that, the lens group 20 is not limited to be configured to include the combination of the first lens 21 , the second lens 22 , the third lens 23 , the fourth lens 24 and the fifth lens 25 . For example, the lens group 20 is set to only including the first lens 21; or only the combination of the first lens 21 and the second lens 22; or only the combination of the first lens 21, the second lens 22 and the third lens 23; or only the first lens 21, A combination of the second lens 22 , the third lens 23 and the fourth lens 24 ; or a combination of more than five lenses is also possible, depending on the actual design requirements.

In this embodiment, the lens module 100 further includes a first shading sheet 31 sandwiched between the first lens 21 and the second lens 22 , a second lens 31 sandwiched between the second lens 22 and the third lens 23 The shading sheet 32, the third shading sheet 33 sandwiched between the third lens 23 and the fourth lens 24, the fourth shading sheet 34 sandwiched between the fourth lens 24 and the fifth lens 25, and the For the light shielding plate 35 between the fourth mirror plate 24 and the fourth light shielding plate 34 , the pressing ring 36 is pressed on the image side of the fifth mirror plate 25 and abuts against the lens barrel 10 .

The shading plate 35 is not only used to absorb stray light generated between the fourth mirror 24 and the fifth mirror 25 to improve the imaging quality of the lens module 100 , but also to adjust the distance between the fourth mirror 24 and the fifth mirror 25 . It can be understood that the shading plate 35 is not limited to be disposed between the fourth lens 24 and the fifth lens 25, and the shading plate 35 can also be disposed between any other adjacent lenses, depending on actual needs.

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 inventive concept of the present application, but these belong to the present application. scope of protection.

Claims

A lens module, comprising a lens barrel with an accommodation space and a lens group accommodated in the accommodation space, the lens group including a first lens on the object side, characterized in that the first lens includes a lens for An imaging optical part and a carrying part arranged around the optical part, the carrying part includes a top surface close to the object side, the optical part includes an object side surface close to the object side and a connecting part connecting the object side surface and the top surface. The side surface is coated with a light absorbing layer.
The lens module according to claim 1, wherein the bearing portion protrudes away from the optical axis along a direction perpendicular to the optical axis from the end of the optical portion close to the image side.
The lens module according to claim 2, wherein the optical part comprises a first part close to the object side and a second part protruding toward the image side from an end of the first part close to the image side, the bearing The portion protrudes away from the optical axis in a direction perpendicular to the optical axis from an end of the second portion close to the lens barrel.
The lens module according to claim 3, wherein the lens barrel comprises a top wall provided with a light-transmitting hole and a barrel wall extending from the top wall toward the image side, and the barrel wall comprises an enclosure formed The inner surface of the accommodating space and the outer surface opposite to the inner surface, the inner surface is recessed away from the optical axis to form a step portion corresponding to the position of the bearing portion, and the bearing portion is at least partially connected to the bearing portion. The step parts are in contact with each other.
The lens module according to claim 4, wherein the inner surface comprises a first surface extending obliquely from the top wall to the image side, and an end of the first surface close to the image side facing away from the light an axially extending second surface, a third surface extending from an end of the second surface away from the optical axis toward the image side, and a fourth surface bent and extending toward the image side from an end of the third surface close to the image side, The second surface and the third surface enclose the step portion, and the top surface is attached and fixed to the second surface.
6. The lens module according to claim 5, wherein the top wall comprises an upper surface on the object side, a first surface extending obliquely from an end of the upper surface close to the optical axis to a direction close to the optical axis an inclined surface, a second inclined surface extending obliquely from the end of the first inclined surface close to the image side to the direction away from the optical axis, and an end of the upper surface away from the optical axis extending to the image side and connected to the outer surface connected side surfaces, the first surface extends from the end of the second inclined surface away from the optical axis to the image side and is enclosed with the second inclined surface to form a receiving portion, the first part is completely received in the receiving The second part protrudes toward the image side from the end of the first part close to the image side and is located outside the accommodating part.
The lens module according to claim 1, wherein the side surface is an inclined surface, and the side surface extends obliquely from the top surface in a direction close to the optical axis.
The lens module according to claim 1, wherein the object side surface is an arc surface, and the object side surface protrudes toward the object side direction.
The lens module according to claim 1, wherein the lens set further comprises at least one lens set on the image side of the first lens, and the lens module further comprises at least one lens set on the adjacent lens. A light-shielding sheet and/or a light-shielding plate in between, and a pressure ring that is pressed and arranged at one end of the lens group close to the image side.
The lens module according to claim 9, wherein the lens group comprises a second lens, a third lens, a fourth lens and a fifth lens which are arranged on the image side of the first lens and are stacked in sequence, The lens module further includes a first shading sheet sandwiched between the first lens and the second lens, and a second shading sheet sandwiched between the second lens and the third lens , a third light-shielding piece sandwiched between the third lens and the fourth lens, a fourth light-shielding plate sandwiched between the fourth lens and the fifth lens, and a fourth light-shielding plate sandwiched between the fourth lens and the fifth lens The shading plate between the fourth lens and the fourth shading plate, the pressure ring is arranged on the image side of the fifth lens and abuts against the lens barrel.