Patent ID: 11971528
Assignee: LARGAN PRECISION CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An image capturing optical 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 towards the object side and an image-side surface facing towards the image side;
wherein the first lens element has negative refractive power, the object-side surface of the first lens element is concave in a paraxial region thereof; the image-side surface of the second lens element is concave in a paraxial region thereof; the object-side surface of the seventh lens element is convex in a paraxial region thereof, the image-side surface of the seventh lens element is concave in a paraxial region thereof and comprises at least one convex critical point in an off-axis region thereof;
wherein an absolute value of a curvature radius of the object-side surface of the third lens element is larger than an absolute value of a curvature radius of the object-side surface of the second lens element.