Zoom lens system

Details Zoom lens system Zoom lens system

1992-12-09

1993-06-22

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359740, G02B 1514

Patent

active

052219950

ABSTRACT:
A zoo comprises, in order from the object side, a first lens group having a positive refractive power that moves along the optical axis for focusing, a second lens group having a negative refractive power that moves along the optical axis for zooming, a third lens group having a negative refractive power that moves along the optical axis for compensating for the image plane that varies upon zooming, and a fixed, imaging fourth lens group having a positive refractive power. The fourth lens group has an aperture and comprises a first sub-group having a positive refractive power and a second sub-group having a positive refractive power, which fourth lens group further satisfies certain conditions.

REFERENCES:
patent: 4200358 (1980-04-01), Tsuji et al.
patent: 4303312 (1981-12-01), Basista
patent: 4629293 (1986-12-01), Mihara
patent: 4832471 (1989-05-01), Haman
patent: 4871240 (1989-10-01), Suda

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