Zoom lens optical system

Details Zoom lens optical system Zoom lens optical system

1993-03-04

1998-11-24

Mai, Son

Optical: systems and elements

Lens

With variable magnification

359775, G02B 1514

Patent

active

058415823

ABSTRACT:
A zoom lens optical system has a first-lens set having a positive refracting power, a second-lens set having a negative refracting power, a third-lens set having a negative refracting power, a fourth-lens set having a positive refracting power, and an optical path splitter means. The first through fourth-lens set and the optical path splitter means are located in this order from the side of a plane of image formation. The zoom lens optical system satisfies the conditions

REFERENCES:
patent: 4240697 (1980-12-01), Takano
patent: 4765722 (1988-08-01), Aono
patent: 5146366 (1992-09-01), Mukaiya
patent: 5204779 (1993-04-01), Nakata

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