Zoom lens system

Details Zoom lens system Zoom lens system

1996-06-05

1999-05-04

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

G02B 1514

Patent

active

059009900

ABSTRACT:
A zoom lens system of the present invention comprises, from the object side, a front lens unit having a positive refractive power and a rear lens unit having a negative refractive power, and performs zooming by changing the spatial distance between the front lens unit and the rear lens unit. The rear lens unit comprises, from the object side, a positive lens and a negative lens, at least one surface of said positive lens being aspherical and the Abbe number and refraction factor of said positive lens being set appropriately.

REFERENCES:
patent: 5218478 (1993-06-01), Itoh
patent: 5327290 (1994-07-01), Fukushima et al.
patent: 5386321 (1995-01-01), Kawamura
patent: 5541773 (1996-07-01), Konno et al.
patent: 5602676 (1997-02-01), Estelle
patent: 5633758 (1997-05-01), Ueda
patent: 5642231 (1997-06-01), Estelle
patent: 5805352 (1998-09-01), Kawamura

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