Patent ID: 11921260
Assignee: ASIA OPTICAL CO., INC.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 11:
12. The lens assembly as claimed in claim 8, wherein the lens assembly satisfies:

2<(R71−R12)/T7<6;

8<f1/T7<13;

2<f3/f<3.5;

wherein f is an effective focal length of the lens assembly, f1 is an effective focal length of the first lens, f3 is an effective focal length of the third lens, T7 is a thickness of the seventh lens along the optical axis, R12 is a radius of curvature of the concave surface of the first lens, and R71 is a radius of curvature of the convex surface of the seventh lens.