Photography – With data recording – Magnetically on film or film cassette
Patent
1999-06-07
2000-08-29
Perkey, W. B.
Photography
With data recording
Magnetically on film or film cassette
360 1, 360 25, 360 55, G03B 1724, G11B 500
Patent
active
061120324
ABSTRACT:
A magnetic reproduction circuit for cameras has a magnetic head for detecting magnetic information on a film. In this reproduction circuit, an amplifying circuit amplifies an output signal of the magnetic head and a filter circuit detects an envelope of an output signal of the amplifying circuit. A detection time constant on a discharge side of the filter circuit is set to be smaller than a cycle of noise exerting an adverse effect on the amplifier circuit.
REFERENCES:
patent: 5727240 (1998-03-01), Mizumoto et al.
patent: 5839008 (1998-11-01), Tanaka et al.
patent: 6026249 (2000-02-01), Sasaki et al.
Olympus Optical Co,. Ltd.
Perkey W. B.
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