Photography – With film drive – Having significant electronic circuit detail
Patent
1997-06-20
1998-11-10
Adams, Russell E.
Photography
With film drive
Having significant electronic circuit detail
396410, G03B 100
Patent
active
058358030
ABSTRACT:
A camera adapted to use a film in which two perforations are respectively formed at both end positions of each picture plane, comprises a winding device which winds the film, first and second perforation detecting devices which are respectively disposed adjacent to both end positions of a portion corresponding to a picture plane size, and a determination device which, while the winding device is performing a winding action of the film, determines that the film is in a stopped state, if none of the perforations is detected by the second perforation detecting device until the lapse of a first predetermined period of time after one of the perforations has been detected by the first perforation detecting device, and if none of the perforations is detected by the first perforation detecting device until the lapse of a second predetermined period of time after one of the perforations has been detected by the second perforation detecting device.
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patent: 5300975 (1994-04-01), Kunishige
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Adams Russell E.
Canon Kabushiki Kaisha
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