Zoom lens

Details Zoom lens Zoom lens

1984-10-10

1989-05-16

Corbin, John K.

350427, 350450, G02B 1514

Patent

active

RE0329231

ABSTRACT:
A lens of variable equivalent focal length where two lens groups located on either side of an aperture defining means move relative to the aperture defining means, and a lens group of positive power is positioned close to the aperture defining means. The aperture defining means and the associated positive power group may either be stationary or move with change in equivalent focal length.

REFERENCES:
patent: 3501224 (1970-03-01), Takahashi
patent: 3840290 (1974-10-01), Betensky et al.
patent: 3918797 (1975-11-01), Takano
patent: 3961845 (1976-06-01), Doi et al.
patent: 3975089 (1976-08-01), Betensky
patent: 4149774 (1979-04-01), Hirano
patent: 4172635 (1979-10-01), Ogino

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