Camera having magnetic head for demagnetizing and recording in d

Details Camera having magnetic head for demagnetizing and recording in d Camera having magnetic head for demagnetizing and recording in d

1991-01-15

1993-01-19

Gellner, Michael L.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361267, G03B 1724, H01F 1300

Patent

active

051810581

ABSTRACT:
A camera arranged to use a film having a magnetic storage part comprises a magnetic head which is arranged to demagnetize a signal pattern previously recorded in the magnetic storage part of the film; and a control circuit which causes the magnetic head to demagnetize the signal pattern previously recorded in the magnetic storage part with a predetermined demagnetization pattern of a frequency lower than the frequency of the signal pattern and to form information to be recorded in the magnetic storage part of the film in the shape of the demagnetization pattern.

REFERENCES:
patent: 4384313 (1983-05-01), Steingroever et al.
patent: 4471403 (1984-09-01), Dress, Jr. et al.
patent: 4864332 (1989-09-01), Harvey
patent: 4970621 (1990-11-01), Gailbreath et al.
patent: 5130728 (1992-07-01), Goto et al.
patent: 5132715 (1992-07-01), Taillie

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