Patent ID: 11880024
Assignee: ZHEJIANG SUNNY OPTICS CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An optical imaging lens group, comprising, in order from an object side to an image side along an optical axis:
a first lens group having a refractive power, in which an image side surface of a lens closest to an imaging side is concave;
a second lens group having a refractive power;
a third lens group having a refractive power; and
a fourth lens group having a negative refractive power, in which an image side surface of a lens closest to the imaging side is concave and includes at least one inflection point,
wherein the first lens group is a fixed group, and the second lens group, the third lens group and the fourth lens group move on the optical axis to realize continuous zoom of the optical imaging lens group from a wide-angle end to a telephoto end; and the second lens group and the third lens group have an unchanged relative position and move on the optical axis simultaneously,
wherein an on-axis distance TG3 from an object side surface of a first lens of the third lens group to an image side surface of the last lens of the third lens group and an on-axis distance TG4 from an object side surface of a first lens of the fourth lens group to an image side surface of the last lens of the fourth lens group satisfy: 0.5<TG3/TG4≤1.