Zoom lens system

Details Zoom lens system Zoom lens system

1995-02-14

1997-07-08

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359689, G02B 1514

Patent

active

056467877

ABSTRACT:
A zoom lens system comprising, at an image side location, a lens unit which has a negative refractive power and consists, in order from the object side, of a positive front subunit and a negative rear subunit: the front subunit being composed of a negative lens component consisting of a negative lens element and a positive lens element, the rear subunit being composed only of a single negative lens component, and the negative lens element having an aspherical surface which weakens a negative refractive power as portions of the aspherical surface are farther from an optical axis thereof.

REFERENCES:
patent: 4836660 (1989-06-01), Ito
patent: 5004329 (1991-04-01), Tsuchida
patent: 5059006 (1991-10-01), Kikuchi et al.

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