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

Claim 0:
1. 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 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, an f-number of the photographing lens assembly is FNo, and the following conditions are satisfied:

|R1/R2|<5.0; and

1.25<FNo≤2.43.