Zoom lens system

Details Zoom lens system Zoom lens system

1996-11-27

1998-09-15

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359717, G02B 1514

Patent

active

058088121

ABSTRACT:
A zoom lens system composed, in order from the object side, of a first positive lens unit and a second negative lens unit, and configured to change a magnification thereof by varying an airspace reserved between the first lens unit and the second lens unit. The first lens unit is composed, in order from the object side, of a first negative lens element, a second plastic lens element which has at least one aspherical surface and a remarkably weak refractive power, and a cemented lens component consisting of a third negative lens element and a fourth positive lens element.

REFERENCES:
patent: 4818081 (1989-04-01), Ito
patent: 5126884 (1992-06-01), Sato
patent: 5162947 (1992-11-01), Ito
patent: 5353163 (1994-10-01), Shibayama et al.
patent: 5386321 (1995-01-01), Kawamura
patent: 5418647 (1995-05-01), Ishisaka
patent: 5585971 (1996-12-01), Itoh
patent: 5666233 (1997-09-01), Ogata

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