Wide-angle zoom lens

Details Wide-angle zoom lens Wide-angle zoom lens

1992-07-13

1994-10-04

Sikes, William L.

Optical: systems and elements

Lens

With variable magnification

359795, G02B 1514

Patent

active

053531639

ABSTRACT:
A wide-angle zoom lens has a first lens group having a positive refracting power and a second lens group having a negative refracting power, which are moved relative to each other along the optical axis so as to attain zooming. The first lens group is constituted in turn from the object side by a front group having a negative refracting power and a rear group having a positive refracting power. The front group has at least one negative lens. The rear group has at least two positive lenses. The zoom lens is constituted to satisfy the following conditions:

REFERENCES:
patent: 4787718 (1988-11-01), Cho
patent: 4836660 (1989-06-01), Ito
patent: 4844600 (1989-07-01), Tokumaru
patent: 4929069 (1990-05-01), Shibayama
patent: 4936661 (1990-06-01), Betensky et al.
patent: 5126884 (1992-06-01), Sato
patent: 5218478 (1993-06-01), Itoh

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