Static information storage and retrieval – Read/write circuit – Bad bit
Patent
1977-10-25
1979-03-20
Hecker, Stuart N.
Static information storage and retrieval
Read/write circuit
Bad bit
1791003V, 358128, 365127, 365215, G11C 2900, G11C 1304
Patent
active
041457587
ABSTRACT:
An error checking method and apparatus for recording digital data in an optical recording medium. Digital data are written onto the medium by a modulated laser whose beam is detected by a first photodetector means which measures laser output directed toward the recording medium. A second photodetector means measures light scattering from the medium, while a third photodetector detects and measures light transmitted through the recording layer of the medium serving to confirm recording of the data. Amounts of transmitted light or scattered light from the medium are correlated to the laser output and to expected values of light for detecting errors in recording immediately after the time of recording. Reversal processing of the recording medium eliminates a large fraction of potential errors.
REFERENCES:
patent: 3365706 (1968-01-01), King
patent: 3452331 (1969-06-01), Barlett
patent: 3638185 (1972-01-01), Dell et al.
patent: 3971002 (1976-07-01), Bricot et al.
patent: 4038663 (1977-07-01), Day et al.
patent: 4051329 (1977-09-01), Blondet et al.
Betz Carl R.
Drexler Jerome
Drexler Technology Corporation
Hecker Stuart N.
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