Optical information recording and reproducing apparatus

Details Optical information recording and reproducing apparatus Optical information recording and reproducing apparatus

1992-12-22

1994-04-05

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Picture signal generator

369 4432, H04N 104

Patent

active

053010418

ABSTRACT:
In an optical information recording and reproducing apparatus, the recording operation is interrupted when an information pit, dust, scratch, stain, etc. is present on an optical recording medium. However, the recording operation is resumed and kept continued when a dust, scratch, stain, etc. other than the information pit is present on the medium. The apparatus comprises a double recording detecting circuit for detecting a pseudo double recording signal generated by a dust, scratch, stain, etc. on the medium at a period of a recording operation; and a recording signal supply circuit for interrupting the recording operation when the double recording detecting circuit detects the pseudo double recording signal to switch the recording period to a monitor period, for maintaining the interruption of the recording operation when a real double recording signal generated by an information pit is detected at the monitor period, and for resuming the recording operation when the real double recording signal generated by an information pit is not detected at the monitor period. After the recording operation has been resumed and further when the pseudo double recording signal generated by a dust, scratch, stain, etc. still remaining on the medium is detected, the monitor and recording periods are repeated alternately. However, after the medium has become free from a dust, scratch, stain, etc. finally and therefore the real and pseudo double recording signals are not both generated, the recording operation is kept continued normally.

REFERENCES:
patent: 4748610 (1988-05-01), Nakata
patent: 5184343 (1993-02-01), Johann et al.
patent: 5235575 (1993-08-01), Han

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