Optical recording and reproducing apparatus with abnormality det

Details Optical recording and reproducing apparatus with abnormality det Optical recording and reproducing apparatus with abnormality det

1987-06-22

1989-01-24

McElheny, Jr., Donald

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369116, G11B 2736

Patent

active

048005487

ABSTRACT:
An optical recording and reproducing apparatus which records information on the optical disc to reproduce the information from the optical disc. It is necessary to detect the abnormal condition, when the abnormal condition has been caused while the information is recording on the optical disc, to change the optical power level of the laser light source into the non-recording condition so that the abnormal data may not be recorded on the optical disc. The track skipping which is not intended, unnecessary during the recording operation, the condition which is not the record power with the record power level being set, the motor which is rotating the optical disc causes the abnormal rotation, are the abnormal condition during the recording operation. The diagnosis function is important which confirms the positive operation of the abnormal condition detection during the recording operation, and of the write protection, because the abnormal condition during the recording operation considerably lowers the reliability of the data recorded on the optical disc.

REFERENCES:
patent: 4103338 (1978-07-01), Cizmic et al.
patent: 4507767 (1985-03-01), Takasugi
patent: 4546462 (1985-10-01), Koishi et al.
patent: 4554652 (1985-11-01), Maeda et al.
patent: 4570251 (1986-02-01), Yokota et al.
patent: 4660189 (1987-04-01), Tsukamura et al.
patent: 4669072 (1987-05-01), Miura et al.
patent: 4725968 (1988-02-01), Baldwin et al.
patent: 4730290 (1988-03-01), Takasago et al.
patent: 4757490 (1988-07-01), Shirai et al.

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