Shutter/diaphragm apparatus

Details Shutter/diaphragm apparatus Shutter/diaphragm apparatus

1997-09-08

1999-12-07

Mathews, A. A.

Photography

Camera detail

Diaphragm shutter unit

396451, 396458, 396510, G03B 908

Patent

active

059971878

ABSTRACT:
A shutter/diaphragm apparatus includes an intermediate plate between a diaphragm cam plate and a diaphragm rotating plate. A plurality of blades are provided between the diaphragm cam plate and the intermediate plate and between the diaphragm rotating plate and the intermediate plate. The blades are driven by a relative rotation between the diaphragm cam plate and the diaphragm rotating plate to vary the size of an aperture defined by the blades. The relative rotation can also completely close the aperture. The invention can also be applied to a diaphragm apparatus which has no shutter function.

REFERENCES:
patent: 2949076 (1960-08-01), Finkl
patent: 4199247 (1980-04-01), Schwarz
patent: 5043753 (1991-08-01), Nakamori
patent: 5072249 (1991-12-01), Yoshida
patent: 5237357 (1993-08-01), Morisawa

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