Zoom viewfinder with fixed size moving window

Details Zoom viewfinder with fixed size moving window Zoom viewfinder with fixed size moving window

1992-09-01

1994-04-05

Wintercorn, Richard A.

Optical: systems and elements

Prism

With reflecting surface

359644, 359738, B03B 1310

Patent

active

053009770

ABSTRACT:
A compact Galilean-type zoom finder suitable for compact cameras, and the like whose zoom ratio is about 2. The zoom finder is comprised of four units having negative, negative, positive and negative refractive powers in order from an object side and a movable fixed aperture framing window. The first and the fourth lens units are fixed and the second and the third lens units are moved to perform zooming. The moving framing window helps to delineate the field of view.

REFERENCES:
patent: 4725130 (1988-02-01), Ozawa
patent: 4757336 (1988-07-01), Nakayama et al.
patent: 4854680 (1989-08-01), Kikuchi
patent: 5173727 (1992-12-01), Lewis
patent: 5194886 (1993-03-01), Mukai et al.
Patent Abstracts of Japan; vol. 10, No. 322 (p-511) (2378) 31 Oct. 1986.

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