Patent ID: 11880021
Assignee: LARGAN PRECISION CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An optical image capturing lenses comprising six lens elements, the six 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 and a sixth lens element;
wherein each of the six lens elements comprises an object-side surface facing towards the object side and an image-side surface facing towards the image side;
wherein the second lens element has negative refractive power; the fifth lens element has negative refractive power; the sixth lens element has positive refractive power; the image-side surface of the first lens element is concave in a paraxial region thereof; the object-side surface of the second lens element is convex in a paraxial region thereof, the image-side surface of the second lens element is concave in a paraxial region thereof;
wherein an absolute value of a curvature radius of the image-side surface of the third lens element is larger than an absolute value of a curvature radius of the object-side surface of the third lens element; an absolute value of a curvature radius of the image-side surface of the sixth lens element is larger than an absolute value of a curvature radius of the object-side surface of the sixth lens element; an axial distance between the third lens element and the fourth lens element is smaller than a central thickness of the third lens element; an absolute value of a focal length of the third lens element is larger than an absolute value of a focal length of the fourth lens element; there is an air gap between each of adjacent lens elements of the six lens elements;
wherein a total number of lens elements in the optical image capturing lenses is six; a focal length of the optical image capturing lenses is f, a focal length of the first lens element is f1, a curvature radius of an object-side surface of the lens element nearest to an image plane with negative refractive power is Rn1, a curvature radius of an image-side surface of the lens element nearest to the image plane with negative refractive power is Rn2, and the following relationships are satisfied:

−0.6<f/f1<0.3; and

0<(Rn1−Rn2)/(Rn1+Rn2)<1.5.