# US 12,007,617 B2 · Imaging lens system, image capturing unit and electronic device

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- Number: US 12,007,617 B2
- Document ID: US12007617B2
- Status: Granted
- Kind: B2
- Application number: 17/177,805
- Filed: 2021-02-17
- Published: 2022-05-19
- Granted: 2024-06-11
- Earliest claimed: 2020-11-13
- Assignees: Largan Precision Co., Ltd.
- Applicants: Largan Precision Co., Ltd
- Inventors: Yu Chen Lai; Ming-Ta Chou; Liang Chieh Weng; Ming-Shun Chang
- Web page: https://patentgrep.com/patent/US12007617B2

## CPC

- G02B 7/003: {Alignment of optical elements (G02B7/001, G02B7/002 take precedence; for mirrors G02B7/1822)}
- G02B 7/021: {for more than one lens}
- G02B 7/025: {using glue}
- G02B 13/0045: {having five or more lenses}
- G02B 13/18: with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration {(G02B13/002 takes precedence)}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An imaging lens system has an optical axis. The imaging lens system includes a plurality of optical elements, a lens barrel, an optical mark structure and a curable liquid. The optical elements are arranged along the optical axis. The lens barrel surrounds the optical axis, and at least one of the optical elements is accommodated in the lens barrel. The optical mark structure is disposed on the lens barrel, and the optical mark structure includes a plurality of optical mark units arranged side by side along a circumference direction that surrounds the optical axis. The curable liquid is disposed on the optical mark structure. The curable liquid is in physical contact with at least one of the optical mark units, and one of the optical elements adjacent to the optical mark structure is fixed to the lens barrel while the curable liquid is cured.

## Claims

### Claim 1

An imaging lens system, having an optical axis, and the imaging lens system comprising:
a plurality of optical elements, arranged along the optical axis, wherein the plurality of optical elements at least comprise a first optical element and a second optical element;
a lens barrel, surrounding the optical axis, wherein the plurality of optical elements are accommodated in the lens barrel;
an optical mark structure, disposed on the first optical element, wherein the optical mark structure faces the second optical element, the optical mark structure comprises a plurality of optical mark units arranged side by side along a circumference direction that surrounds the optical axis, and each of the plurality of optical mark units comprises a first optical mark surface and a second optical mark surface, and the first optical mark surface and the second optical mark surface of each of the plurality of optical mark units are arranged side by side; and
a curable liquid, disposed on the optical mark structure, wherein the curable liquid is in physical contact with at least one of the plurality of optical mark units, and the first optical element is fixed to the second optical element while the curable liquid is cured;
wherein a projection area of each of the first optical mark surfaces on a reference surface perpendicular to the optical axis is A, a distance along the circumference direction between center points of two of the first optical mark surfaces adjacent in the circumference direction is D, an angle between an observation direction and the optical mark structure is θ, a gloss value difference in the observation direction between the first optical mark surface and the second optical mark surface of each of the plurality of optical mark units is ΔG, and the following conditions are satisfied:
0.001 [mm2]≤A≤0.072 [mm2];
0.03 [mm]≤D≤1.0 [mm];
50 [deg.]≤θ≤90 [deg.]; and
15 [GU]≤ΔG≤50 [GU].

### Claim 2 (depends on 1)

The imaging lens system according to claim 1, wherein the projection area of each of the first optical mark surfaces on the reference surface perpendicular to the optical axis is A, and the following condition is satisfied:
0.002 [mm2]≤A≤0.042 [mm2].

### Claim 3 (depends on 1)

The imaging lens system according to claim 1, wherein the second optical element covers at least part of the optical mark structure in a direction parallel to the optical axis.

### Claim 4 (depends on 1)

The imaging lens system according to claim 1, wherein the projection area of each of the first optical mark surfaces on the reference surface perpendicular to the optical axis is A, the distance along the circumference direction between center points of two of the first optical mark surfaces adjacent in the circumference direction is D, and the following condition is satisfied:
0.05≤√(A)/D≤1.5.

### Claim 5 (depends on 1)

The imaging lens system according to claim 1, wherein the plurality of optical mark units arranged along a direction away from the optical axis, and the optical mark structure forms a mesh pattern.

### Claim 6 (depends on 1)

An image capturing unit, comprising:
the imaging lens system of claim 1.

### Claim 7 (depends on 6)

An electronic device, comprising:
the image capturing unit of claim 6; and
an image sensor disposed on an image surface of the imaging lens system.