Apparatus for restoring lost data to a memory device

Details Apparatus for restoring lost data to a memory device Apparatus for restoring lost data to a memory device

1980-05-05

1981-11-10

Franklin, Lawrence R.

354214, 354217, 354 23D, G03B 160, G03B 1736

Patent

active

042994667

ABSTRACT:
In a photographic camera, an electrically powered memory device stores data obtained by sensing detectable means on a filmstrip, but loses stored data upon a power diminution below a minimum level necessary for memory retention. When electrical power is resumed above such minimum level to a predetermined higher level, a film drive is operated to rewind the filmstrip at least until the detectable means previously sensed during film advance have been returned past the sensing device. Then, the film drive is operated to re-advance the filmstrip substantially the same distance it was rewound. During re-advance, the sensing device again senses the detectable means to restore lost data to the memory device.

REFERENCES:
patent: 3444795 (1969-05-01), Nerwin
patent: 4021828 (1977-05-01), Jura
patent: 4174888 (1979-11-01), Hunn

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