1982-03-15
1984-04-17
Gonzales, John
35417311, 3542711, G03B 1912
Patent
active
044430833
ABSTRACT:
In a single lens reflex camera having a reflecting mirror provided across the light path of a light beam travelling toward a film surface past the stop of a phototaking lens so as to be retractable from the light path, an apparatus for driving the stop device of the phototaking lens for the control of the stop to a predetermined aperture value and the reflecting mirror in relation to the exposure to the film surface includes stop-down operating means capable of being coupled to the stop device and displaceable between a first position for providing a maximum aperture opening to said stop and a second position for providing a minimum aperture diameter to said stop, moving means having a first moving area capable of moving forward while imparting the displacement from the first position to the second position to the stop-down operating means and moving backward while imparting the displacement from the second position to the first position to the stop-down operating means and a second moving area continuous to the first moving area and capable of moving while maintaining the stop-down operating means in the second position, and drive means for moving the moving means forward in the first moving area before the exposure to the film surface and subsequently moving the moving means in the second area. The drive means includes means for driving the reflecting mirror for said retraction while the moving means is in the second moving area.
REFERENCES:
patent: 3854811 (1974-12-01), Araki
patent: 4173403 (1979-11-01), Ueda et al.
patent: 4194820 (1980-03-01), Nakano et al.
patent: 4264171 (1981-04-01), Hahn et al.
Gonzales John
Nippon Kogaku K.K.
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