TWI444695B - Spacer and lens module having same - Google Patents

Description

Spacer ring and lens module having the same

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

With the development of optical imaging technology, the lens module has been widely used in imaging devices such as digital cameras and video cameras, and electronic devices such as mobile phones and notebooks integrated with lens modules have been favored by many consumers. The lens module with shooting function is generally composed of an optical element and a spacer ring, and the spacer ring is disposed between two adjacent optical elements to adjust the distance between the adjacent two optical elements, thereby adjusting the lens mode. The optical properties of the set, such as between two lenses, to adjust the effective focal length of the lens module.

Currently, spacer rings are generally obtained by injection molding. In some practical applications, the inner surface of the spacer ring is designed to be wedge-shaped in order to block stray light passing through the edge of the lens. The sharp corners of the inner surface of the wedge are obtained by breaking. Generally, if the sharp corner is too small (for example, less than or equal to 45 degrees), it is not easy to form by the break, resulting in the inner diameter of the spacer ring being smaller than the design value. If the sharp corner is too large (for example, greater than or equal to 80 degrees), the impulse will cause the raw material to fill the sharp corner when the raw material is injected from the gate. Due to the large force, the raw material can even fill the gap between the male and female molds, thus It is easy to produce burrs, and the inner diameter of the spacer ring is not uniform and inaccurate after molding. However, in applications, the size of the inner diameter of the spacer ring may have a large effect on the optical performance of the lens module, and the inner diameter of the spacer ring may not meet the requirements.

In view of the above, it is necessary to provide a spacer ring whose inner diameter is easy to meet the requirements when molding and a lens module having the spacer ring.

A spacer ring for mounting in a lens barrel and disposed between a first optical element and a second optical element. The spacer ring includes a first surface for resisting the first optical element, a second surface opposite to the first surface and for resisting the second optical element, and a first surface and The second surface is vertically connected and is configured to resist an outer sidewall of the lens barrel and an inner sidewall opposite the outer sidewall. The spacer ring has an apex that projects into the spacer ring. The inner sidewall includes a first sidewall extending from the apex parallel to the first surface toward the outer sidewall, a second sidewall for connecting the second surface and the first sidewall, and a direction extending toward the apex and connecting the a first surface and a third sidewall of the first sidewall. The first side wall and the third side wall form a sharp corner at the apex, and the sharp angle is in a range of 60 degrees to 70 degrees.

A lens module includes a lens barrel, a first optical element, a second optical element, and a spacer ring. The first optical element, the spacer ring and the second optical element are sequentially housed in the lens barrel.

The spacer ring and the lens module having the spacer ring have a first side wall and a third side wall forming a sharp corner at an apex, and the sharp angle is in a range of 60 degrees to 70 degrees, and the spacer ring is at the angle It is easier to form and is less prone to burrs, which ensures that the inner diameter of the spacer ring is more accurate after molding.

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

Referring to FIG. 1 , a lens module 100 according to the present invention includes a lens barrel 10 , a first optical component 20 , a second optical component 30 , and a spacer ring 40 .

The lens barrel 10 includes an imaging side 110 and an open side 120 opposite the imaging side 110.

The first optical element 20 , the spacer ring 40 and the second optical element 30 are sequentially received in the lens barrel 10 from the imaging side 110 to the opening side 120 . In this embodiment, the first optical element 20 and the second optical element 30 are both lenses and have a common optical axis OO'.

Referring to FIG. 2 , the spacer ring 40 includes a first surface 41 , a second surface 42 opposite to the first surface 41 , and an outer sidewall perpendicularly connecting the first surface 41 and the second surface 42 . 43 and an inner side wall 44 opposite the outer side wall 43.

The first surface 41 is adjacent to the open side 120 for abutting the second optical element 30. The second surface 42 is adjacent to the imaging side 110 for abutting the first optical element 20. The outer side wall 43 is for resisting the lens barrel 10.

The spacer ring 40 has a vertex S that projects into the spacer ring 40. The inner sidewall 44 includes a first sidewall 441 extending from the vertex S along the first surface 41 toward the outer sidewall 43 , a second sidewall 442 connecting the second surface 42 and the first sidewall 441 , and a The direction of the vertex S extends and connects the first surface 41 and the third sidewall 443 of the first sidewall 441. It can be understood that the orthographic projection of the first sidewall 441 on the outer sidewall 43 is located between the first surface 41 and the second surface 42.

The first side wall 441 and the third side wall 443 form a sharp angle θ at the vertex S. In the present embodiment, 60° ≦ θ ≦ 70°, so that the sharp angle θ is easier to shape and is less likely to cause burrs. It can be ensured that the inner diameter of the spacer ring 40 is more accurate after molding.

The existing problem of the sharp angle θ is not easily formed due to the existing difficulty in aligning the male mold and the female mold during the molding process. In the present embodiment, the spacer ring 40 is obtained by a method of injection molding. Specifically, a mold is formed after the male mold (not shown) is clamped with the female mold (not shown), and the spacer ring is formed. The apex S of 40 is formed at the intersection of the male mold and the female mold, since the first side wall 441 extends from the apex parallel to the first surface 41 to the outer side wall 43. When the male mold and the female mold are closed, they are staggered, so that it is easier to form the sharp angle θ. In the present embodiment, the length of the first side wall 441 is in the range of 0.025 mm to 0.035 mm.

In addition, if the degree Ф1 of the acute angle formed by the second side wall 442 and the optical axis OO' (shown as a parallel line MM' with the optical axis OO') is too small, burrs are easily generated after molding to make the interval. The inner diameter of the ring 40 is not accurate. If the degree Ф1 of the acute angle formed by the second side wall 442 and the optical axis OO' is too large, the tip end of the spacer ring 40 is too sharp and is not easily formed during the production process. In this embodiment, the second side wall 442 and the optical axis OO' form an acute angle of 40° ≦Ф 1 ≦ 60°. As such, it is easy to mold and the inner diameter of the spacer ring 40 can be made more accurate.

The third sidewall 443 includes a first segment 443a, a second segment 443b, and a third segment 443c. The first segment 443a extends perpendicularly from the first surface 41. The second segment 443b is coupled to the first segment 443a and extends in the direction of the apex S. One end of the third segment 443c is connected to the second segment 443b, and the other end is connected to the vertex S.

The length of the first segment 443a is not less than 0.03 mm, that is, the length of the first segment 443a may be 0.03 mm or more than 0.03 mm. In this way, it is possible to prevent the burrs generated during molding from affecting the thickness of the inner side wall 44 of the spacer ring 40 in a direction parallel to the outer side wall 43, so that the second optical element 30 and the first surface 41 of the spacer ring 40 The optical axis of the second optical element 30 is aligned with the optical axis of the first optical element 20.

The second segment 443b has an acute angle of 60° ≦Ф 2 ≦ 70° with the optical axis OO', and the acute angle formed by the third segment 443c and the optical axis OO' is 20° ≦Ф 3 ≦ 30°. In this way, the tip end of the spacer ring 40 can be made too sharp, so that it can be easily formed.

The spacer ring and the lens module having the spacer ring have a first side wall and a third side wall forming a sharp corner at an apex, and the sharp angle is in a range of 60 degrees to 70 degrees, and the spacer ring is at the angle It is easier to form and is less prone to burrs, which ensures that the inner diameter of the spacer ring is more accurate after molding.

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 is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application in this case. 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‧‧‧ lens module

10‧‧‧Mirror tube

110‧‧‧ imaging side

120‧‧‧Open side

20‧‧‧First optical component

30‧‧‧Second optical component

40‧‧‧ spacer ring

41‧‧‧ first surface

42‧‧‧ second surface

43‧‧‧Outer side wall

44‧‧‧ inner side wall

441‧‧‧First side wall

442‧‧‧second side wall

443‧‧‧ third side wall

443a‧‧‧ first paragraph

443b‧‧‧second paragraph

443c‧‧‧ third paragraph

1 is a cross-sectional view of a camera module in accordance with a preferred embodiment of the present invention.

Figure 2 is an enlarged view of II of the spacer ring of Figure 1.

100‧‧‧ lens module

10‧‧‧Mirror tube

110‧‧‧ imaging side

120‧‧‧Open side

20‧‧‧First optical component

30‧‧‧Second optical component

40‧‧‧ spacer ring

Claims (10)

a spacer ring for mounting in a lens barrel and disposed between a first optical component and a second optical component, the spacer ring including a first surface for resisting the first optical component, Opposite and parallel to the first surface and for resisting the second surface of the second optical component, a vertical connection with the first surface and the second surface, and for resisting the outer sidewall of the lens barrel and a The inner side wall of the outer side wall is modified in that the spacer ring has an apex protruding toward the spacer ring, and the inner side wall includes a first side wall extending from the vertex parallel to the first surface toward the outer side wall, a second sidewall for connecting the second surface and the first sidewall and a third sidewall extending toward the apex and connecting the first surface and the first sidewall, wherein the first sidewall and the third sidewall are A sharp corner is formed at the apex, and the sharp corner is in the range of 60 to 70 degrees. The spacer ring of claim 1, wherein the length of the first side wall is in the range of 0.025 mm to 0.035 mm. The spacer ring of claim 2, wherein the second side wall forms an acute angle with the optical axis of the first optical element in a range of 40 degrees to 60 degrees. The spacer ring of claim 1, wherein the second surface is located on an image forming side of the lens barrel, and the third side wall includes a first segment extending perpendicularly from the first surface, the first segment The length is not less than 0.03 mm. The spacer ring of claim 4, wherein the third side wall further comprises a second segment and a third segment connected to the first segment and extending toward the apex, the third segment Connected to the second segment, the other end is connected to the vertex, the second segment and the optical axis of the first optical element form an acute angle in the range of 60 degrees to 70 degrees, the third segment and the third The optical axis of an optical element forms an acute angle in the range of 20 to 30 degrees. A lens module comprising a lens barrel, a first optical element, a second optical element, and a spacer ring according to any one of claims 1 to 4, the first optical element, the spacer ring And the second optical element is sequentially housed in the lens barrel. The lens module of claim 6, wherein the first side wall has a length in the range of 0.025 mm to 0.035 mm. The lens module of claim 6, wherein the second side wall and the outer side wall form an acute angle in the range of 40 degrees to 60 degrees. The lens module of claim 6, wherein the second surface is located on an image forming side of the lens barrel, and the third side wall includes a first segment extending perpendicularly from the first surface, the first The length of the segment is not less than 0.03 mm. The lens module of claim 9, wherein the third sidewall further includes a second segment and a third segment connected to the first segment and extending toward the apex, the third segment One end is connected to the second segment, and the other end is connected to the vertex, and the second segment forms an acute angle with the optical axis of the first optical element in a range of 60 degrees to 70 degrees, and the third segment The optical axis of the first optical element forms an acute angle in the range of 20 to 30 degrees.