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

Claim 6:
7. The lens assembly as claimed in claim 3, wherein the lens assembly satisfies:

0 mm<|f234|<50 mm

−35 mm<(f1×f6)/(T1+T2+T6)<−6 mm;

−3.5<(R11+R12)/(R52−R62)<−1;

0.5<TTL/(R62−R52)<1.9;

wherein f234 is an effective focal length of a combination of the second lens, the third lens, and the fourth lens, f1 is an effective focal length of the first lens, f6 is an effective focal length of the sixth lens, T1 is a thickness of the first lens along the optical axis, T2 is a thickness of the second lens along the optical axis, T6 is a thickness of the sixth lens along the optical axis, R11 is a radius of curvature of the convex surface of the first lens, R12 is a radius of curvature of the concave surface of the first lens, R52 is a radius of curvature of the convex surface of the fifth lens, R62 is a radius of curvature of the concave surface of the sixth lens, and TTL is an interval from the convex surface of the first lens to an image plane along the optical axis.