Compact zoom lens optical system and driving method of the same
AssigneeDiostech Co., Ltd.
InventorsMoon-Hyun Kim, Jin-Hee Kang
Life of this patent
Estimating the term…
Abstract
A refractive-type zoom lens optical system includes a first lens group having a negative lens power and including a reflection member, a second lens group having a negative lens power, a third lens group having a positive lens power, a fourth lens group having a negative lens power, and a stop between the second lens group and the third lens group, wherein an overall length of the system is fixed during zooming and focusing.
Claims11
A refractive-type zoom lens optical system, comprising:
- a first lens group having a negative lens power and including a reflection member;
- a second lens group having a negative lens power;
- a third lens group having a positive lens power;
- a fourth lens group having a negative lens power;
- and
- a stop between the second lens group and the third lens group,
- wherein an overall length of the system is fixed during zooming and focusing.
A driving method of a refractive-type zoom lens optical system, which includes a first lens group having a negative lens power and including a reflection member, a second lens group having a negative lens power, a third lens group having a positive lens power, a fourth lens group having a negative lens power, and a stop between the second lens group and the third lens group, wherein an overall length of the system is fixed during zooming and focusing, the method comprising:
- controlling magnification of the system by moving the third and fourth lens groups;
- and
- controlling a focus of the system by moving the second lens group.
Dependencies are inferred from the claim text.