Photography – With film drive – Double exposure prevention
Patent
1995-03-07
1997-09-23
Metjahic, Safet
Photography
With film drive
Double exposure prevention
396410, G03B 118
Patent
active
056714564
ABSTRACT:
A microcomputer provided in a camera body uses a data signal read by sensors facing the data disk of a film cartridge as a positional signal to set the stop position of the spool for providing exposed/unexposed indication to the film. The voltage of the power supply of the camera is detected to modulate a pulse duration by which the number of rotations of the motor can be kept constant in rewinding the film. The sensors are disposed upstream in the rotational direction of the data disk by a certain angle .theta. with respect to the point at which the spool is stopped in order to prevent the dislocation between the display mark of the cartridge and the pointing mark of the data disk. The microcomputer discriminates whether or not data has been read. The mechanism for feeding the film is controlled to set the film at a predetermined position after the decision that the data has been read.
REFERENCES:
patent: 4412164 (1983-10-01), Ohnuma
patent: 4431292 (1984-02-01), Takashi
patent: 4613224 (1986-09-01), Ogasawara
patent: 4734732 (1988-03-01), Nishio et al.
patent: 4935765 (1990-06-01), Ishida et al.
patent: 4958175 (1990-09-01), Asakura et al.
patent: 5032854 (1991-07-01), Smart et al.
Hamada Satoshi
Kido Toshihito
Tsuji Kenji
Han J. K.
Metjahic Safet
Minolta Camera Kabushiki Kaisha
LandOfFree
System for providing an accurate indication whether film is expo does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System for providing an accurate indication whether film is expo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System for providing an accurate indication whether film is expo will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1942585