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US 2023/0418026 A1Published application
Lens Assembly
AssigneesSintai Optical (Shenzhen) Co., Ltd., Asia Optical Co., Inc.
InventorsYuan-Fan Liang, Jia-Sin Chen
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Abstract
A lens assembly includes a first lens, a second lens, a third lens, and a cover glass. The first lens is with positive refractive power and includes a convex surface facing an image side. The second lens is a meniscus lens with refractive power. The third lens is with positive refractive power and includes a convex surface facing the image side. The first lens, the second lens, the third lens, and the cover glass are arranged in order from the image side to an object side along a first optical axis.
Claims20
A lens assembly comprising:
- a first lens which is with positive refractive power and comprises a convex surface facing an image side;
- a second lens which is a meniscus lens with refractive power;
- a third lens which is with positive refractive power and comprises a convex surface facing the image side;
- and
- a cover glass;
- wherein the first lens, the second lens, the third lens, and the cover glass are arranged in order from the image side to an object side along a first optical axis;
- wherein the lens assembly satisfies at least one of following conditions:
- 0.6<f/TTL<0.8;
- 0.85<(f+BFL)/TTL<1.2;
- 0.36<(f−BFL)/TTL<0.55;
- 1.6<(TTL+BFL)/f<1.95;
- 0.5<(TTL−BFL)/f<1.15;
- wherein f is an effective focal length of the lens assembly, TTL is an interval from an image side surface of the first lens to a lighting surface along the first optical axis, and BFL is an interval from an object side surface of the lens closest to the object side to an image side surface of the cover glass along the first optical axis.
10 more elements
Dependencies are inferred from the claim text.