Zoom lens system

Details Zoom lens system Zoom lens system

1996-02-21

1999-02-23

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359682, 359739, G02B 1514

Patent

active

058750606

ABSTRACT:
A zoom lens system includes, in order from the object side to the image side, a first lens unit, having a negative refractive power, which moves along an optical axis during a zooming operation, a stop diaphragm which moves along the optical axis with the first lens unit at one body during the zooming operation, and a second lens unit having a positive refractive power.

REFERENCES:
patent: 4390248 (1983-06-01), Ikemori
patent: 4711533 (1987-12-01), Saito
patent: 4726666 (1988-02-01), Ota et al.
patent: 4999007 (1991-03-01), Aoki et al.
patent: 5054897 (1991-10-01), Ozawa
patent: 5280390 (1994-01-01), Ito
patent: 5283693 (1994-02-01), Kohno et al.
patent: 5329401 (1994-07-01), Sato
patent: 5339195 (1994-08-01), Ogata
patent: 5602680 (1997-02-01), Sakamoto
patent: 5663836 (1997-09-01), Ogata

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