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

Claim 3:
4. The tens assembly as claimed in claim 2, wherein the lens assembly satisfies:

−20 mm<f×((f1−f6)/(T5+T6−R62+R52))<−5 mm;

wherein T5 is the thickness of the fifth lens along the optical axis, T6 is the thickness of the sixth lens along the optical axis, R52 is the radius of curvature of the convex surface of the fifth lens, R62 is the radius of curvature of the concave surface of the sixth lens, f is the effective focal length of the lens assembly, f1 is the effective focal length of the first lens, and f6 is the effective focal length of the sixth lens.