Patent ID: 11885940
Assignee: LARGAN PRECISION CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 16:
17. A photographing lens assembly comprising six lens elements, the six lens elements being, in order from an object side to an image side:
a first lens element with negative refractive power having an object-side surface being concave in a paraxial region thereof, wherein the object-side surface of the first lens element has at least one convex critical point in an off-axis region thereof;
a second lens element;
a third lens element having positive refractive power;
a fourth lens element having positive refractive power;
a fifth lens element having negative refractive power; and
a sixth lens element having an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof, wherein the image-side surface of the sixth lens element has at least one convex critical point in an off-axis region thereof, and the object-side surface and the image-side surface of the sixth lens element are both aspheric;
wherein a central thickness of the first lens element is smaller than a central thickness of the sixth lens element;
wherein a curvature radius of the object-side surface of the first lens element is R1, a curvature radius of an image-side surface of the first lens element is R2, a focal length of the first lens element is f1, a focal length of the sixth lens element is f6, and the following conditions are satisfied:

|R1/R2|<5.0; and

|f1/f6|<1.0.