TWI416191B - Lens module and camera module - Google Patents

Abstract

A lens module includes a barrel, a first lens, a second lens and a spacer ring. The first lens, the spacer ring and the second lens are received in the barrel along the optical axis. The spacer includes a first surface, a second surface and an inner surface. The first surface is parallel to the second surface. The inner surface is in connected with the first surface and the second surface. The first surface is in contact with the first lens. The second lens is in contact with the second lens. The inner surface includes a first inclined plane and a second inclined plane. The first inclined plane is connected with the second inclined plane. An acute angle is formed between the first surface and the first inclined surface. Another acute angle is formed between the second surface and the second inclined surface. The lens module can reduce flare and improve the quality of image. A camera module having the lens module is also provided.

Description

Lens module and camera module

The present invention relates to the field of optical system technologies, and in particular, to a lens module capable of reducing glare and a camera module having the lens module.

With the development of multi-functional electronic products, camera modules are widely used in consumer electronic products such as mobile phones, notebook computers, and personal digital assistants. While people are pursuing multi-functionality, they also hope that electronic products have excellent image effects, that is, they hope that the camera module has excellent image quality. Takano, H, published in "Consumer Electronics" in February 1995, entitled "Two-phase direct-drive motor built into a camcorders zoom lens barrel", reveals a camera module with excellent imaging. Quality, while having the advantage of compact structure.

The camera module usually consists of a lens barrel with optical components and a lens holder with an image sensor. Please refer to the camera module 200 shown in FIG. 5 , which includes a lens holder 210 , a lens barrel 220 , a first lens 230 , a second lens 240 , a spacer ring 250 , and an image sensor 260 . The spacer ring 250 is disposed between the first lens 230 and the second lens 240 for spacing the first lens 230 and the second lens 240 to prevent friction or collision between adjacent lenses from being damaged. The lens barrel 220 is screwed into the lens holder 210 to fix the relative position of the lens barrel 220 and the lens holder 210, and the imaging surface of the optical system formed by the optical lens in the lens barrel 220 falls on the image sensor 260. . However, part of the incident light is not directly refracted and enters the image sensor 260, but is reversed on the surface of the spacer ring 250. After entering the image sensor 260, the glare is formed, causing the image to be blurred, and the presence of glare seriously affects the quality of the captured image.

In view of the above, it is necessary to provide a lens module capable of reducing glare and a camera module having the lens module.

A lens module will be described below with specific embodiments.

The present invention provides a lens module including a lens barrel, a first lens, a second lens, and a spacer ring. The first lens, the spacer ring and the second lens are sequentially disposed in the lens barrel along an optical axis, and the spacer ring has a first a surface, a second surface opposite the first surface, and an inner wall connecting the first surface and the second surface, the first surface being in contact with the first lens, the second surface being in contact with the second lens, the improvement being that The inner wall includes a first inclined surface and a second inclined surface. The angle between the first inclined surface and the first surface is an acute angle, and the angle between the second inclined surface and the second surface is also an acute angle. The invention also provides a camera module having the lens module.

Compared with the prior art, the lens module of the present invention utilizes the direct or indirect scattering or reflection of the first slope and the second slope of the spacer ring to reflect the light incident on the inner wall of the spacer ring to the object side direction, so that Finally, the scattered light scattered toward the image sensor near the image side is weakened, which can effectively reduce glare and improve the imaging quality of the lens module.

The lens module of the present technical solution will be combined with the following embodiments and the accompanying drawings. The group and the camera module having the lens module are further described in detail.

Referring to FIG. 1 and FIG. 2 , the camera module 1 provided by the first embodiment of the present invention includes a lens module 10 , a lens holder 20 , and an image sensor 30 .

The lens holder 20 has a first receiving hole 22, and an inner wall of the first receiving hole 22 is provided with an internal thread. The lens module 10 and the image sensor 30 are received on both sides of the first receiving hole 22 . The lens module 10 is used to form optical imaging. The image sensor 30 is located on the image side of the camera module 1 and is connected to the printed circuit board 40 to convert the digital signal of the image sensor 30 into an electrical signal and transmit it to the outside. The image sensor 30 can be a Charge Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor Transistor (CMOS) for converting an optical imaging signal into a digital signal.

Specifically, the lens module 10 includes a lens barrel 11, a first lens 12, a second lens 13, and a spacer ring 14.

The lens barrel 11 is a cylindrical body including a cylindrical wall 101 and a lens cover 111. The lens barrel 11 is provided with a threaded engagement with the lens holder 20 such that the lens barrel 11 and the lens holder 20 can be fixed by a threaded fit. The cylindrical wall 101 of the lens barrel 11 encloses a second receiving hole 102 for forming a cylindrical shape. The second receiving hole 102 is for receiving the first lens 12, the spacer ring 14 and the second lens 13. The lens cover 111 has a circular light transmission hole 104 so that external light can be incident into the lens barrel 11 through the light transmission hole 104.

The first lens 12, the spacer ring 14 and the second lens 13 are sequentially accommodated in the lens barrel 11 along the optical axis. The first lens 12 is adjacent to the object side, and includes a first optical portion 121 located at a central portion of the lens and surrounding the first optical portion 121 The first non-optical portion 122 is disposed. The first optical portion 121 is used to implement the optical function of the design during the imaging process. The first non-optical portion 122 does not participate in imaging for supporting the first optical portion 121. The first non-optical portion 122 has a first abutting surface 123 and a second abutting surface 124. The first abutting surface 123 is in contact with the lens cover 111 of the lens barrel 11 . The second abutment surface 124 is in contact with the spacer ring 14 .

The second lens 13 is adjacent to the image side and includes a second optical portion 131 at a central portion of the lens and a second non-optical portion 132 surrounding the second optical portion 131. The second optical portion 131 is used to implement the optical function of the design during the imaging process. The second non-optical portion 132 does not participate in imaging. The second non-optical portion 132 has a third abutment surface 133 opposite the first lens 12. The third abutting surface 133 is in contact with the spacer ring 14 .

The spacer ring 14 is a ring between the first lens 12 and the second lens 13 for spacing the first lens 12 and the second lens 13. The spacer ring 14 has a first surface 141, a second surface 142 opposite the first surface 141, and an inner wall 143 and an outer wall 144 connecting the first surface 141 and the second surface 142. The first surface 141 is in contact with the second abutting surface 124 of the first lens 12, and the second surface 142 is in contact with the third abutting surface 133 of the second lens 13.

The inner wall 143 includes a first bevel 145 and a second bevel 146 that are connected. The angle between the first slope 145 and the first surface 141 is an acute angle θ ₁ . The angle between the second slope 146 and the second surface 142 is an acute angle θ ₂ . An angle θ is formed between the first slope 145 and the second slope 146. Since the first surface 141 is parallel to the second surface 142, the angle θ is equal to the sum of the acute angle θ 1 and the acute angle θ 2 . Preferably, the angle θ value ranges from 50° to 90°.

The outer wall 144 is in contact with the barrel wall 101. If the distance between the inner wall 143 and the outer wall 144 on the first surface 141 is L1 and the distance on the second surface 142 is L2, the value of L1 may be greater than L2 according to the optical parameter of the first lens 12. The value can also be less than or equal to the value of L2. In this embodiment, the value of L1 is greater than the value of L2. The spacer ring 14 can be integrally formed or assembled. In this embodiment, the spacer ring 14 is integrally formed. The material of the spacer ring 14 is an opaque plastic.

When the camera module 1 is in operation, most of the incident light passes through the first optical portion 121 of the first lens 12 and the second optical portion 131 of the second lens 13 to form an image on the image sensor 30. And transmitted to the outside by the printed circuit board 40, but a small portion of the light may pass through the first optical portion 121 of the first lens 12, and will be directed toward the inner wall 143 of the spacer ring 14 and reflected. Since the spacer ring 143 in the present technical solution has the first inclined surface 145 and the second inclined surface 146 connected thereto, a part of the light that is directed toward the inner wall 143 may be directly scattered or reflected by the second inclined surface 146 to the object side direction. Another portion of the light that is directed toward the inner wall 143 may first reach the first bevel 145, then be scattered or reflected by the first bevel 145 to the second bevel 146, and then scattered or reflected by the second bevel 146 to the object side. Therefore, the spacer ring 14 can scatter or reflect the light incident on the inner wall 143 of the spacer ring 14 as far as possible to the object side direction, and disperse and attenuate the reflected light which is finally incident on the image sensor 30 near the image side, thereby avoiding a large amount of The reflected light enters the image sensor 30 to form a glare, which causes a blurred image.

Of course, in order to facilitate the molding, the spacer ring can also be divided into a plurality of parts for assembly and manufacture. Referring to FIG. 3 , the spacer ring 24 provided by the second embodiment of the present technical solution includes a first spacing portion 241 and a second spacing portion 242 . The first spacer portion 241 and the second spacer portion 242 are both semi-annular structures. The first spacing portion 241 has a first mating surface 243 having a second mating surface 244 corresponding to the first mating surface 243. Preferably, the first mating surface 243 and the second mating surface 244 are both inclined surfaces. In this embodiment, the angle between the first mating surface 243 and the first surface 245 is an acute angle, and the angle between the first surface 246 and the second surface 246 is an obtuse angle. The angle between the second mating surface 244 and the first surface 245 is an obtuse angle, and the angle between the second mating surface 246 and the second surface 246 is an acute angle. The angle between the first mating surface 243 and the first surface 245 is equal to the angle between the second mating surface 244 and the second surface 246. The angle between the first mating surface 243 and the second mating surface 246 is equal to the second mating surface 244 and the first surface. The angle between the surfaces 245. Therefore, the first spacing portion 241 and the second spacing portion 242 can be joined to each other by the first mating surface 243 and the second mating surface 244, and the spacer ring 24 can be formed by adhesive bonding or other means.

Referring to FIG. 4 , the spacer ring 34 provided by the third embodiment of the present technical solution includes a first spacer ring 341 and a second spacer ring 342 . The first spacer ring 341 and the second spacer ring 342 are both annular. The first spacer ring 341 has a first surface 343, a third surface 347, and a first slope 345. The second spacer ring 342 has a second surface 344, a fourth surface 348, and a second slope 346. Therefore, the first spacer portion 341 and the second spacer portion 342 can be joined by the mutual abutment of the third surface 347 and the fourth surface 348, and the spacer ring 34 can be formed by adhesive bonding or other means. The first slope 345 and the second slope 346 The angle is an acute angle. Preferably, the angle between the first slope 345 and the second slope 346 ranges from 50° to 90°.

Of course, when the lens module includes three or more lenses, it may further include two or more spacer rings, so that a spacer ring is disposed between any adjacent two lenses. In addition, the spacer ring may also be disposed between the lens and the infrared cut filter. In summary, the spacer ring can be disposed between any two optical elements that generate glare due to reflection to avoid glare formation.

Compared with the prior art, the lens module of the present technical solution has the advantages that the light incident on the inner wall of the spacer ring can be made by direct or indirect scattering or reflection of the first inclined surface and the second inclined surface of the spacer ring. The reflection is reflected to the object side direction, so that the reflection of the reflected light that is finally directed toward the image sensor near the image side is weakened, which can effectively reduce glare and improve the imaging quality of the lens module.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

Camera module ‧‧1

Lens module ‧‧10

Mirror ‧‧11

First lens ‧‧12

Second lens ‧‧13

Spacer ‧‧‧14,24,34

Mirror ‧‧20

First receiving hole ‧‧22

Image sensor ‧ ‧ 30

Printed circuit board ‧ ‧ 40

Wall ‧‧‧101

Second receiving hole ‧‧‧102

Light transmission hole ‧‧104

Lens cap ‧‧11

First Optics Department ‧‧121

First non-optical section ‧‧122

First abutment ‧‧‧123

Second abutment ‧‧‧124

Second Optics Department ‧‧‧131

Second non-optical section ‧‧‧132

Third abutment ‧ ‧ 133

First surface ‧‧‧141, 245, 343

Second surface ‧‧‧142, 246, 344

Inner wall ‧ ‧ 143

Outer wall ‧‧144

First slope ‧ ‧ 145, 247, 345

Second slope ‧‧‧146, 248, 346

First compartment ‧‧‧241

Second compartment ‧ ‧ 242

First mating surface ‧ ‧ 243

Second mating surface ‧‧‧244

First spacer ring ‧ ‧ 341

Second spacer ring ‧‧ 342

Third surface ‧‧ 347

Fourth surface ‧‧ 348

1 is a cross-sectional view of a camera module provided by a first embodiment of the present technical solution.

2 is a cross-sectional view of a spacer ring provided by the first embodiment of the present technical solution.

3 is a cross-sectional view of a spacer ring provided by a second embodiment of the present technical solution.

4 is a cross-sectional view of a spacer ring provided by a third embodiment of the present technical solution.

Figure 5 is a cross-sectional view of a prior art camera module.

Camera module ‧‧1

Lens module ‧‧10

Mirror ‧‧11

First lens ‧‧12

Second lens ‧‧13

Spacer ‧‧14

Mirror ‧‧20

First receiving hole ‧‧22

Image sensor ‧ ‧ 30

Printed circuit board ‧ ‧ 40

Wall ‧‧‧101

Second receiving hole ‧‧‧102

Light transmission hole ‧‧104

Lens cap ‧‧11

First Optics Department ‧‧121

First non-optical section ‧‧122

First abutment ‧‧‧123

Second abutment ‧‧‧124

Second Optics Department ‧‧‧131

Second non-optical section ‧‧‧132

Third abutment ‧ ‧ 133

Claims (10)

A lens module includes a lens barrel, a first lens, a second lens, and a spacer ring. The first lens, the spacer ring and the second lens are sequentially disposed in the lens barrel along an optical axis, and the spacer ring has a first surface, a second surface opposite the first surface and an inner wall connecting the first surface and the second surface, the first surface being in contact with the first lens, the second surface being in contact with the second lens, the improvement being that the inner wall comprises The first inclined surface and the second inclined surface are connected, the angle between the first inclined surface and the first surface is an acute angle, and the angle between the second inclined surface and the second surface is also an acute angle. The lens module of claim 1, wherein the angle between the first slope and the second slope is 50° to 90°. The lens module of claim 1, wherein the first surface is parallel to the second surface. The lens module of claim 1, wherein the spacer ring is a ring. The lens module of claim 1, wherein the spacer ring comprises a first spacer portion and a second spacer portion, wherein the first spacer portion and the second spacer portion are both semi-annular structures, and the first spacer portion The first mating surface has an acute angle with the first surface, and the angle between the first mating surface and the first surface is an obtuse angle. The second spacer has a second mating surface corresponding to the first mating surface. The lens module of claim 1, wherein the spacer ring comprises a first spacer ring and a second spacer ring, wherein the first spacer ring and the second spacer ring are both annular structures. a surface is located opposite the first slope a first spacer ring, the second surface and the second slope are located on the second spacer ring. The lens module of claim 1, wherein the spacer ring is made of an opaque plastic. A camera module includes a lens holder, an image sensor received in the lens holder, and a lens module according to claim 1, wherein the lens holder has a first receiving hole corresponding to the lens barrel, The lens barrel is received in the first receiving hole. The camera module of claim 8, wherein the image sensor is located on an image side of the camera module. The camera module of claim 8, wherein the lens barrel and the lens holder are fixed by a threaded fit.