Variable viewfinder mask assembly

Details Variable viewfinder mask assembly Variable viewfinder mask assembly

1995-05-24

1997-04-22

Gellner, Michael L.

Photography

With viewfinder

Selective or adjustable viewfinder field

G03B 1310, G03B 1302

Patent

active

056233248

ABSTRACT:
A variable viewfinder mask assembly is adjustable to provide three different rectangular mask openings; the first and second of such openings being of the same height but of different widths and the first and third of said openings being of the same width but of different heights. Means are also provided to prevent overtravel of a drive member from influencing the adjustments of the mask openings.

REFERENCES:
patent: 2149384 (1939-03-01), Becker
patent: 2157548 (1939-05-01), Leitz
patent: 2187246 (1940-01-01), Nerwin
patent: 2943549 (1960-07-01), Nerwin
patent: 4251149 (1981-02-01), Kimura
patent: 5255030 (1993-10-01), Mukai et al.
patent: 5345285 (1994-09-01), Hasushita et al.

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