Compact zoom lens

Details Compact zoom lens Compact zoom lens

1996-12-04

1998-11-03

Mai, Son

Optical: systems and elements

Lens

With variable magnification

359784, 359791, G02B 1514

Patent

active

058317724

ABSTRACT:
A zoom lens is disclosed, comprising, from front to rear, a first, second and third lens units of positive, positive and negative refractive powers, respectively, all the lens units moving forward to effect zooming from the wide-angle end to the telephoto end, the first lens unit including at least one negative and at least one positive lenses, and the second lens unit including a negative lens whose front surface is concave, a positive lens and a cemented lens composed of a negative lens whose rear surface is concave and a bi-convex lens, and the zoom lens satisfying the following condition:

REFERENCES:
patent: 4978204 (1990-12-01), Ito
patent: 5166828 (1992-11-01), Ogata
patent: 5218476 (1993-06-01), Ito
patent: 5272566 (1993-12-01), Aoki
patent: 5315439 (1994-05-01), Ito
patent: 5363243 (1994-11-01), Takayuki
patent: 5365376 (1994-11-01), Itoh
patent: 5379154 (1995-01-01), Shibayama
patent: 5523888 (1996-06-01), Nishio
patent: 5585971 (1996-12-01), Itoh
patent: 5587840 (1996-12-01), Itoh

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