Patent ID: 11921260
Assignee: SINTAI OPTICAL (SHENZHEN) CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A lens assembly comprising:
a first lens which is a meniscus lens with positive refractive power and comprises a convex surface facing an object side and a concave surface facing an image side;
a second lens which is with refractive power;
a third lens which is with refractive power;
a fourth lens which is with positive refractive power and comprises a convex surface facing the object side;
a fifth lens which is with positive refractive power and comprises a convex surface in a paraxial region facing the image side and a concave surface facing the object side; and
a sixth lens which is with negative refractive power and comprises a convex surface along an optical axis facing the object side and a concave surface facing the image side;
wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are arranged in order from the object side to the image side along the optical axis;
wherein the lens assembly satisfies following conditions:

10 mm<(R11+R12+R52+R62)×((T5+T6)/G5)<29 mm;

13.97 mm<|AAG×(R21+R22)/(R21−R22)|<20 mm;

wherein T6 is a thickness of the sixth lens along the optical axis, T5 is a thickness of the fifth lens along the optical axis, R52 is a radius of curvature of the convex surface of the fifth lens, R62 is a radius of curvature of the concave surface of the sixth lens, R11 is a radius of curvature of the convex surface of the first lens, R12 is a radius of curvature of the concave surface of the first lens, G5 is an air interval from the convex surface of the fifth lens to an object side surface of the sixth lens along the optical axis, AAG is a total air interval from the concave surface of the first lens to an object side surface of a lens which is closest to the image side along the optical axis, R21 is a radius of curvature of an object side surface of the second lens, and R22 is a radius of curvature of an image side surface of the second lens.