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

Claim 13:
14. A photographing optical lens system comprising seven lens elements, the seven lens elements being, in order from an object side to an image side: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, and a seventh lens element;
wherein each of the seven lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side, the image-side surface of the seventh lens element has at least one inflection point, the object-side surface of the first lens element is convex in a paraxial region thereof and the image-side surface of the first lens element is concave in a paraxial region thereof, the second lens element has positive refractive power and the object-side surface of the second lens element is convex in a paraxial region thereof, an axial distance between the object-side surface of the first lens element and an image surface is TL, a focal length of the photographing optical lens system is f, a focal length of the first lens element is f1, a focal length of the second lens element is f2, a minimum among Abbe numbers of the seven lens elements is Vmin, and the following conditions are satisfied:

0.30<TL/f<1.25;

|f2/f1|<1.20; and

10.0<Vmin≤19.5;

wherein a curvature radius of the object-side surface of the sixth lens element and a curvature radius of the image-side surface of the sixth lens element have a same sign.