Patent ID: 11971527
Assignee: LARGAN PRECISION CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 17:
18. The photographing optical lens system of claim 14, wherein a maximum among refractive indices of the seven lens elements is Nmax, the focal length of the photographing optical lens system is f, the focal length of the first lens element is f1, the focal length of the second lens element is f2, a focal length of the third lens element is f3, a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, a focal length of the sixth lens element is f6, a focal length of the seventh lens element is f7, a minimum among |f/f1|, |f/f2|, |f/f3|, |f/f4|, |f/f5|, |f/f6|, and |f/f7| is |f/fi|min, and the following conditions are satisfied:

1.58<Nmax<1.72; and

|f/fi|min<0.10, i=1,2,3,4,5,6,7.