Patent
1990-04-03
1991-03-26
Hix, L. T.
354214, 354217, G03B 112
Patent
active
050033328
ABSTRACT:
An electrically operated camera having a release means for effecting a shutter release action for the light exposure of film is capable of determining whether a film is loaded or not in the basis of the film feeding condition. A film feed detection means detects the action of a film being rewound by a film rewind means, and generates a signal upon detection. When a controller receives the signal during the film rewind action, the controller prevents the release means from effecting shutter release after the completion of the rewind action. When no signal is received during the rewind action, the controller permits the release means to effect shutter release after the completion of the rewind action. The action of the film feed condition may alternatively be detected when it is being wound by a film wind means. If it is determined that the camera is loaded with a film, release lock is effected so as to prevent the exposed frame from being subjected to any further exposure by the user. If a film unloaded state of the camera is determined, it can perform the release action, thereby facilitating the checking of its various actions.
REFERENCES:
patent: 4853731 (1989-08-01), Tsujimura et al.
Amanuma Tatsuo
Ohtsubo Yoshiaki
Watanabe Naoki
Hix L. T,.
Nikon Corporation
Spyrou Cassandra C.
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