Lens assembly
AssigneesSintai Optical (Shenzhen) Co., Ltd., Asia Optical Co., Inc.
InventorsMing-Huang Tseng, Hsi-Ling Chang
Life of this patent
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Abstract
A lens assembly includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens are arranged in order from an object side to an image side along an optical axis. The first lens has negative refractive power. The second lens has positive refractive power. The third lens has negative refractive power and includes a convex surface facing the image side. The fourth lens has positive refractive power and includes a concave surface facing the object side. The fifth lens has positive refractive power and includes a concave surface facing the image side.
Claims18
A lens assembly, comprising sequentially from an object side to an image side along an optical axis:
- a first lens with negative refractive power;
- a second lens with positive refractive power;
- a third lens with negative refractive power including a convex surface facing the image side;
- a fourth lens with positive refractive power including a concave surface facing the object side;
- a fifth lens with positive refractive power including a concave surface facing the image side;
- wherein the lens assembly satisfies:
- 1.7<f4/f<6,
- wherein f4 is an effective focal length of the fourth lens and f is an effective focal length of the lens assembly.
A lens assembly, comprising sequentially from an object side to an image side along an optical axis:
- a first lens with negative refractive power;
- a second lens with positive refractive power;
- a third lens with negative refractive power;
- a fourth lens with positive refractive power including a concave surface facing the object side;
- a fifth lens with positive refractive power including a concave surface facing the image side;
- wherein the lens assembly satisfies at least one of the following conditions:
- 4<(f4−f3)/f<10,−3<f1+f2<−1
- wherein f1 is an effective focal length of the first lens, f2 is an effective focal length of the second lens, f3 is an effective focal length of the third lens, f4 is an effective focal length of the fourth lens, and f is an effective focal length of the lens assembly.
Dependencies are inferred from the claim text.