Real image zoom viewfinder

Details Real image zoom viewfinder Real image zoom viewfinder

1991-12-13

1993-09-21

Hayes, Monroe H.

Optical: systems and elements

Prism

With reflecting surface

354199, 359676, 359679, G03B 1310

Patent

active

052473244

ABSTRACT:
A compact real image zoom finder suitable for compact cameras, and the like whose zoom ratio is about 2. The zoom finder comprises: (a) an objective including four lens units having positive, negative, positive and negative refractive powers in order from an object side. The first and the fourth lens units are fixed and the second and the third lens units are moved to perform zooming; (b) a stationary field lens and; (c) a rotating assembly and an eyepiece combination.

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patent: 4805999 (1989-02-01), Ueda et al.
patent: 4854680 (1989-08-01), Kikuchi
patent: 4906078 (1990-03-01), Inabata et al.
patent: 5005955 (1991-04-01), Ohshita
patent: 5081480 (1992-01-01), Abe
patent: 5130845 (1992-07-01), Ruben
patent: 5136430 (1992-08-01), Hamanishi
patent: 5173727 (1992-12-01), Lewis

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