Dynamic magnetic information storage or retrieval – General recording or reproducing – Recording-or erasing-prevention
Patent
1986-12-12
1988-08-16
Cardillo, Raymond F.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Recording-or erasing-prevention
360 721, G11B 1504, G11B 1518
Patent
active
047648236
ABSTRACT:
A video cassette recorder (VCR) erase protection system which is responsive to the standard anti-erase switch on a video cassette, is capable of "filling-in" unused portions of an erase-protected video cassette without disturbing previously recorded material on the cassette and without requiring the user to turn off the anti-erase switch on the cassette. By eliminating the need to turn off the anti-erase switch before recording additional material, the possibility of forgetting to later rearm the switch is eliminated. A microprocessor, responding to the anti-erase switch position and to the video signal sensed during an initial fast winding of the tape, intelligently positions the tape prior to recording so that recording takes place in unused tape portions only, without requiring any further action by the user. The microprocessor commands the video cassette recorder to fast wind the tape past previously recorded material, before permitting the recording operation to begin, whenever it senses that the cassette has an anti-erase switch in the ON position.
REFERENCES:
patent: 4005481 (1977-01-01), Lackner
patent: 4214280 (1980-07-01), Halfhill et al.
patent: 4249041 (1981-02-01), Smith, Jr. et al.
patent: 4418367 (1983-11-01), Nagai et al.
Cardillo Raymond F.
Eastman Kodak Company
Sachar Surinder
Wallace Robert M.
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