Zoom lens system

Details Zoom lens system Zoom lens system

1999-02-24

2000-08-08

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359686, G02B 1514

Patent

active

06101043&

ABSTRACT:
A zoom lens system has, from the object side, a first lens unit having a positive optical power, a second lens unit having a negative optical power, a third lens unit having a positive optical power, and a fourth lens unit having a positive optical power. The first, second, and fourth lens units are moved during zooming. The third lens unit is fixed during zooming. The following conditions are fulfilled:

REFERENCES:
patent: 4113355 (1978-09-01), Tsuji et al.
patent: 4691513 (1987-09-01), Takahashi
patent: 4818083 (1989-04-01), Mihara
patent: 4859042 (1989-08-01), Tanaka
patent: 4952039 (1990-08-01), Ito
patent: 5100223 (1992-03-01), Ono et al.
patent: 5528423 (1996-06-01), Arimoto et al.
patent: 5546231 (1996-08-01), Sato

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