Imaging lens system having retaining element and electronic device

Patent metadata

Field	Value
Publication number	US-2024353649-A1
Application number	US-202418762332-A
Country	US
Kind code	A1
Filing date	Jul 2, 2024
Priority date	Dec 11, 2020
Publication date	Oct 24, 2024
Grant date	—

Abstract

An imaging lens system includes an imaging lens assembly, a spacer element and a retaining element. The spacer element is configured to maintain a distance between a first lens element and a second lens element of the imaging lens assembly. The spacer element includes a connecting part connected to the second lens element and a supporting part connected to the connecting part and extending from the connecting part towards an optical axis of the imaging lens assembly. The first lens element is disposed on the supporting part. The retaining element is configured to fix the first lens element to the supporting part. The retaining element includes a retaining surface, and the retaining surface and the first lens element are abutted against each other. There is an air gap between the retaining element and the first lens element, and the air gap is adjacent to the retaining surface.

First claim

What is claimed is:

1 . An imaging lens system, comprising:
an imaging lens assembly, comprising a first lens element, a second lens element and a third lens element, wherein the first lens element is a glass lens element, and the second lens element and the third lens element are plastic lens elements; a spacer element, configured for positioning the first lens element between the second lens element and the third lens element and configured to maintain a distance between the first lens element and the second lens element and maintain another distance between the first lens element and the third lens element, and the spacer element comprising:
a connecting part, wherein the second lens element and the third lens element are respectively connected to opposite sides of the connecting part in a direction parallel to an optical axis of the imaging lens assembly; and
a supporting part, connected to the connecting part and extending from the connecting part towards the optical axis of the imaging lens assembly, wherein the first lens element is disposed on the supporting part; and
a retaining element, comprising a retaining surface, wherein the retaining surface and the first lens element are abutted against each other so as to fix the first lens element to the supporting part of the spacer element, and the retaining surface and the supporting part are respectively in physical contact with opposite surfaces of the first lens element; wherein there is an air gap between the retaining element and the first lens element, and the air gap is adjacent to the retaining surface; and wherein an outer diameter of the first lens element is D1, an outer diameter of the second lens element is D2, an outer diameter of the third lens element is D3, and the following conditions are satisfied:

D
⁢
1
/
D
⁢
2

<
1

;
and

⁢

D
⁢
1
/
D
⁢
3

<

1
.

2 . The imaging lens system of claim 1 , wherein the retaining surface is formed as a part of a spherical surface, and the retaining surface is in physical contact with a curved surface of the first lens element.

3 . The imaging lens system of claim 1 , wherein the retaining surface is formed as a part of a conical surface, and the retaining surface is in physical contact with a curved surface of the first lens element.

4 . The imaging lens system of claim 1 , wherein the retaining element comprises a plurality of wedged structures, each of the plurality of wedged structures tapers off towards the air gap, and the plurality of wedged structures are arranged around the optical axis.

5 . The imaging lens system of claim 1 , wherein there are a plurality of strip structures disposed between the spacer element and the retaining element, each of the plurality of strip structures extends in a direction parallel to the optical axis, and the plurality of strip structures are arranged around the optical axis.

6 . The imaging lens system of claim 1 , wherein the connecting part has an axial connection structure connected to the second lens element, and the axial connection structure comprises:
an annular inclined surface, configured to coaxially align the first lens element with the second lens element; and an annular planar surface, configured to maintain the distance between the first lens element and the second lens element.

7 . The imaging lens system of claim 6 , wherein the imaging lens assembly further comprises an optical shutter disposed between the first lens element and the second lens element, and the optical shutter is closer to the optical axis than the axial connection structure.

8 . The imaging lens system of claim 1 , wherein an outer diameter of the retaining element is Φr, the outer diameter of the second lens element is D2, and the following condition is satisfied:

ϕr
/
D
⁢
2

<
1.

9 . An imaging lens system, comprising:
an imaging lens assembly, comprising a first lens element, a second lens element and a third lens element, wherein the first lens element is a glass lens element, and the second lens element and the third lens element are plastic lens elements; a spacer element, configured for positioning the first lens element between the second lens element and the third lens element and configured to maintain a distance between the first lens element and the second lens element and maintain another distance between the first lens element and the third lens element, and the spacer element comprising:
a connecting part, wherein the second lens element and the third lens element are respectively connected to opposite sides of the connecting part in a direction parallel to an optical axis of the imaging lens assembly; and
a supporting part, connected to the connecting part and extending from the connecting part towards the optical axis of the imaging lens assembly, wherein the first lens element is disposed on the supporting part; and
a retaining element, comprising a retaining surface, wherein the retaining surface and the first lens element are abutted against each other so as to fix the first lens element to the supporting part of the spacer element, and the retaining surface and the supporting part are respectively in physical contact with opposite surfaces of the first lens element; wherein the retaining element is disposed between the first lens element and the second lens element, and the retaining element is not in physical contact with the second lens element; and wherein an outer diameter of the first lens element is D1, an outer diameter of the second lens element is D2, an outer diameter of the third lens element is D3, and the following conditions are satisfied:

D
⁢
1
/
D
⁢
2

<
1

;
and

⁢

D
⁢
1
/
D
⁢
3

<

1
.

10 . The imaging lens system of claim 9 , wherein the connecting part has an axial connection structure connected to the second lens element, and the axial connection structure comprises:
an annular inclined surface, configured to coaxially align the first lens element with the second lens element; and an annular planar sur

Assignees

• Largan Precision Co Ltd

Inventors

• Tsai Chun-Tang
• Chang Lin An
• Chou Ming-Ta
• Chang Ming-Shun

Classifications

• G02B7/026

  using retaining rings or springs (G02B7/027 takes precedence) · CPC title

• G02B13/18

  with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration {(G02B13/002 takes precedence)} · CPC title

• G02B7/028

  with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation · CPC title

• G02B7/021 Primary

  for more than one lens · CPC title