Patent ID: 11940597
Assignee: LARGAN PRECISION CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 23:
24. An image capturing optical lens system comprising four lens elements, the four lens elements being, in order from an object side to an image side along an optical path:
a first lens element, a second lens element, a third lens element and a fourth lens element;
wherein the third lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof;
the fourth lens element has negative refractive power;
wherein an Abbe number of the second lens element is V2, an Abbe number of the third lens element is V3, a focal length of the image capturing optical lens system is f, a curvature radius of an object-side surface of the fourth lens element is R7, a curvature radius of an image-side surface of the fourth lens element is R8, a central thickness of the first lens element is CT1, a central thickness of the second lens element is CT2, a sum of all axial distances between adjacent lens elements of the image capturing optical lens system is ΣAT, an axial distance between the second lens element and the third lens element is T23, an axial distance between an object-side surface of the first lens element and an image surface is TL, and the following conditions are satisfied:

10<V2+V3<55;

f/|R7|+f/|R8|<6.0;

0.30<CT1/CT2<2.7;

1.0<ΣAT/T23<2.5;

TL/f<1.40; and

0.19≤f2/f4<1.25.