Patent ID: 11966031
Assignee: LARGAN PRECISION CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An image lens assembly comprising, in order from an object side to an image side along an optical path:
a first lens group comprising a first lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof; and a second lens element having negative refractive power;
a second lens group comprising a third lens element and a fourth lens element;
a third lens group comprising a fifth lens element with negative refractive power, and a sixth lens element; and
a fourth lens group comprising a seventh lens element;
wherein, a total number of lens elements in the image lens assembly is seven, at least one lens element of the image lens assembly comprises at least one inflection point in an off-axis region thereof; when the image lens assembly is focusing or zooming, a relative position between the first lens group and an image surface is fixed, a relative position between the fourth lens group and the image surface is fixed, and the second lens group and the third lens group move along an optical axis; at least four lens elements of the image lens assembly are made of plastic material;
wherein, a maximum field of view in a zoom range of the image lens assembly is FOVmax, a minimum field of view in the zoom range of the image lens assembly is FOVmin, and the following conditions are satisfied:

FOVmax<50 degrees; and

1.25<FOVmax/FOVmin<6.0.