Zoom lens system

Details Zoom lens system Zoom lens system

1998-02-06

1999-12-07

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359717, 359740, G02B 1514, G02B 302

Patent

active

059993316

ABSTRACT:
A zoom lens system has, from the object side, a first lens unit having a positive optical power and a second lens unit having a negative optical power. The second lens unit is provided at the image side of said first lens unit with a variable air space formed between said first and second lens units. The zooming from the shortest focal length condition to the longest focal length condition is performed by decreasing said variable air space. The zoom lens system fulfills the following conditions:

REFERENCES:
patent: 4836660 (1989-06-01), Ito
patent: 5526187 (1996-06-01), Lee
patent: 5541772 (1996-07-01), Lin
patent: 5585971 (1996-12-01), Itoh
patent: 5610767 (1997-03-01), Ito
patent: 5666233 (1997-09-01), Ogata
patent: 5675440 (1997-10-01), Kanamori
patent: 5757556 (1998-05-01), Nishimura
patent: 5777800 (1998-07-01), Yamaguchi et al.

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