Compact zoom lens system comprising two lens units

Details Compact zoom lens system comprising two lens units Compact zoom lens system comprising two lens units

1996-01-15

1997-09-02

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359715, 359714, G02B 1514, G02B 302

Patent

active

056638361

ABSTRACT:
A zoom lens system comprising a front lens unit having a negative refractive power and a rear lens unit having a positive refractive power, and configured so as to perform a change of a magnification thereof by varying an airspace reserved between these two lens units. The rear lens unit consists, in order from the object side, of a positive lens component, a positive lens component and a negative lens component which has at least one aspherical surface. The zoom lens system is composed of a small number of lens elements, sufficiently compact, and has high optical performance, a wide field angle and a high vari-focal ratio.

REFERENCES:
patent: 5076677 (1991-12-01), Sato
patent: 5182673 (1993-01-01), Kikuchi et al.
patent: 5283693 (1994-02-01), Kohno et al.
patent: 5381268 (1995-01-01), Sato
patent: 5381269 (1995-01-01), Estelle

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