TWI420230B - Spacer and camera module using same - Google Patents

Description

Spacer ring and lens module using the same

The invention relates to a spacer ring and a lens module using the same.

The prior lens module generally includes at least one spacer ring disposed between the two optical components to adjust the distance between the two optical components, thereby adjusting the optical performance of the lens module, such as Adjust the focal length and so on between the two lenses.

However, as shown in FIG. 1 , a conventional camera module 1 includes a lens barrel 2 , a first lens 3 , a spacer ring 4 , a second lens 5 , a lens holder 6 , and an image sensor 7 . The spacer ring 4 is disposed between the first lens 3 and the second lens 5 for controlling the distance between the first lens 3 and the second lens 5. The lens barrel 2 is screwed into the lens holder 6 to adjust the relative position of the lens barrel 2 and the lens holder 6, and the imaging surface of the optical system formed by the optical lens in the lens barrel 2 falls on the image sensor 7. on. However, part of the incident light L does not directly enter the image sensor 7 after being refracted, but is reflected on the surface of the spacer ring 4 and enters the image sensor 7 to form a ghost. The presence of ghosts seriously affects the shooting. The quality of the image.

In view of the above, it is necessary to provide a spacer ring that can improve ghosting and a lens module using the spacer ring.

A spacer ring for a lens module. A circular hole is disposed in the center of the spacer ring, and a ring-shaped groove is disposed on the wall of the circular hole along the circumferential direction of the circular hole, and the annular groove has a V-shaped cross section with an apex angle greater than 50 degrees, and the annular groove The surface is anti-reflective.

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 received in the lens barrel. A circular hole is disposed in the center of the spacer ring, and a ring-shaped groove is disposed on the wall of the circular hole along a circumferential direction of the circular hole, and the annular groove has a V-shaped cross section with an apex angle greater than 50 degrees, and the ring shape The surface of the groove is anti-reflective.

Since the spacer ring has an annular groove, the annular groove has a V-shaped section with an apex angle greater than 50 degrees, and the anti-reflective treatment is adopted on the surface of the annular groove, so that the light incident on the spacer ring can be multiple times on the inner surface of the annular groove. Reflected and consumed, only a very small portion of the reflected light is directed to the side of the object, thereby avoiding a large amount of reflected light forming ghosts affecting the image quality.

1, 100‧‧‧ camera module

2, 11‧‧ ‧ lens barrel

12a‧‧‧First Lens Optics

4, 13‧‧‧ spacer ring

13b‧‧‧ hole wall

131‧‧‧ first side

5, 14‧‧‧ second lens

14b‧‧‧Second lens non-optical part

7, 30‧‧‧ Image Sensor

10‧‧‧Lens module

3, 12‧‧‧ first lens

12b‧‧‧First lens non-optical part

13a‧‧‧ round hole

130‧‧‧ring groove

132‧‧‧ second side

14a‧‧‧Second lens optics

6, 20‧‧ ‧ mirror base

40‧‧‧ boards

1 is a cross-sectional view of a prior camera module.

2 is a cross-sectional view of a camera module provided by the present invention.

The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

Referring to FIG. 2, the present invention provides a camera module 100. The camera module 100 includes a lens barrel 11 , a first lens 12 , a spacer ring 13 , a second lens 14 , a lens holder 20 , and an image sensor 30 . The lens barrel 11 , the first lens 12 , the spacer ring 13 , and the second lens 14 constitute a lens module 10 . The first lens 12, the spacer ring 13 and the second mirror The sheets 14 are sequentially housed in the lens barrel 11.

A circular hole 13a is disposed in the center of the spacer ring 13. A ring-shaped groove 130 is disposed on the hole wall 13b of the circular hole 13a along the circumferential direction of the circular hole 13a, and the annular groove 130 has a V-shaped cross section with a vertex angle A greater than 50 degrees. The two sides of the V-shaped cross section of the annular groove 130 are a first side 131 and a second side 132. In this embodiment, the first side 131 is close to the object side, the angle B between the first side 131 and the object side of the optical axis M is between 40 and 55 degrees, and the second side 132 is close to the image side. The angle C between the second side 132 and the image side of the optical axis M is between 30 and 40 degrees. In this embodiment, the apex angle A is 95 degrees, the object side angle B is 45 degrees, and the image side angle C is 40 degrees. The surface of the annular groove 130 is treated with anti-reflection treatment. In the present embodiment, the hole wall 13b of the circular hole 13a is treated with anti-reflection treatment. The spacer ring 13 is made of a light absorbing material or a light absorbing film is formed on the hole wall 13b of the circular hole 13a, which can be formed by anodization, vapor deposition, sputtering, or the like, or in the circle. The hole wall 13b of the hole 13a is subjected to matte treatment. In the embodiment, the spacer ring 13 is made of a light absorbing material. The spacer ring 13 is disposed between the first lens 12 and the second lens 14 . The spacer ring 13 is fixed to the lens barrel 11 by glue bonding or the like. The spacer ring 13 can be formed in one time or by bonding two half rings. In the present embodiment, the spacer ring 13 is molded at one time.

The first lens 12 and the second lens 14 each include optical portions 12a and 14a and non-optical portions 12b and 14b. The non-optical portions 12b and 14b of the first lens 12 and the second lens 14 are used for the first lens 12 and the second lens 14 to engage with the spacer ring 13 and the lens barrel 11. In the present embodiment, the spacer ring 13 is sandwiched between the non-optical portions 12b and 14b of the first lens 12 and the second lens 14.

The lens barrel 11 is mounted on the lens holder 20. In the present embodiment, the lens barrel 11 is screwed to the lens holder 20. The image sensor 30 is received in the lens holder 20 . In the embodiment, the image sensor 30 is received in the lens holder 20 via the circuit board 40 .

When the lens module 10 is in operation, the incident light L passes through the optical portions 12a, 14a of the first lens 12 and the second lens 14 in sequence, and most of the light forms an image on the image sensor 30. However, there will still be some light rays L1 that will be reflected on the surface of the spacer ring 13. Since the spacer ring 13 is provided with an annular groove 130 having a V-shaped cross section. It has been found through experiments that when the apex angle A of the annular groove 130 is greater than 50 degrees, part of the light ray L1 can be reflected and consumed multiple times through the surface of the annular groove 130, and finally only a very small portion of the reflected light is directed toward the object side. Therefore, a large amount of reflected light is prevented from entering the image sensor 30 to form a ghost.

Since the spacer ring has an annular groove, the annular groove has a V-shaped section with an apex angle greater than 50 degrees, and the anti-reflective treatment is adopted on the surface of the annular groove, so that the light incident on the spacer ring can be multiple times on the inner surface of the annular groove. Reflected and consumed, only a very small portion of the reflected light is directed to the side of the object, thereby avoiding a large amount of reflected light forming ghosts affecting the image quality.

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.

100‧‧‧ camera module

11‧‧‧Mirror tube

12a‧‧‧First Lens Optics

13‧‧‧ spacer ring

13b‧‧‧ hole wall

131‧‧‧ first side

14‧‧‧second lens

14b‧‧‧Second lens non-optical part

30‧‧‧Image Sensor

10‧‧‧Lens module

12‧‧‧ first lens

12b‧‧‧First lens non-optical part

13a‧‧‧ round hole

130‧‧‧ring groove

132‧‧‧ second side

14a‧‧‧Second lens optics

20‧‧‧Mirror base

40‧‧‧ boards

Claims (8)

A spacer ring for a lens module, wherein the spacer ring is centrally provided with a circular hole, and the improvement is that a ring-shaped groove is arranged on the wall of the circular hole along the circumferential direction of the circular hole, and the annular groove is The cross-section is a V-shaped apex angle greater than 50 degrees, the surface of the annular groove is anti-reflective treatment, the annular groove has two sides, and an angle of an edge near the object side and the optical axis is between 40 and 55 degrees, close to the image The angle between one side of the side and the optical axis is between 30 and 40 degrees. The spacer ring for a lens module according to claim 1, wherein the spacer ring is made of a light absorbing material. The spacer ring for a lens module according to claim 1, wherein the annular groove surface is subjected to a matte treatment or a light absorbing film. The spacer ring for a lens module according to claim 1, wherein the spacer ring is formed in one time or by combining two half rings. 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 received in the lens barrel, and a center of the spacer ring is disposed. The hole is improved in that a ring-shaped groove is disposed on the wall of the circular hole along the circumferential direction of the circular hole, and the annular groove has a V-shaped cross section with an apex angle greater than 50 degrees, and the surface of the annular groove is protected In the retroreflective treatment, the annular groove has two sides, an edge of the object side is at an angle of between 40 and 55 degrees with respect to the optical axis, and an edge of the image side is at an angle of between 30 and 40 degrees with the optical axis. The lens module of claim 5, wherein the spacer ring is made of a light absorbing material. The lens module of claim 5, wherein the annular groove surface is subjected to a matte treatment or a plated absorption film. The lens module of claim 5, wherein the spacer ring is formed in one time or by combining two half rings.