Camera using film with magnetic track

Details Camera using film with magnetic track Camera using film with magnetic track

1997-01-28

1998-06-09

Metjahic, Safet

Photography

With film drive

Double exposure prevention

396390, G03B 1724

Patent

active

057650640

ABSTRACT:
A camera (100), suitable for using photographic film (18) with a magnetic track (33), includes a transporting mechanism (M, 22) for transporting the film along a film transport path, a magnetic head (11) positioned adjacent the film transport path so as to read information magnetically recorded on an adjacent portion of the magnetic track, signal processing circuits (12, 42) to provide a digital output signal responsive to thus read information, and a microcomputer (13) for comparing a digital output signal to predetermined threshold levels in order to determine whether or not information is recorded on the portion of the magnetic track being read by the magnetic head and for setting the threshold values. The threshold levels can be set in accordance with a level of the digital output signal when magnetically recorded information is not being read by the magnetic head, e.g., before the film is fed or during the feeding of the film before the first frame reaches the magnetic head. The camera can also include a detector (45) for detecting information (27) indicative of the type of film in the camera and the threshold levels can be set in accordance with the type of film detected by the detector. The threshold levels can be upper and lower threshold values centered on a predetermined value.

REFERENCES:
patent: 5017326 (1991-05-01), Wash et al.
patent: 5432570 (1995-07-01), Ueda et al.
patent: 5519462 (1996-05-01), Spencer et al.
patent: 5614969 (1997-03-01), Hukawa
patent: 5617161 (1997-04-01), Sorita et al.

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