Optical recording and reproducing apparatus with abnormality detector
First Claim
1. An optical recording and reproducing apparatus comprising an optical recording and reproducing means for focusing a laser light source onto an optical disc to record or reproduce the information, an abnormal record detecting means which detects that the abnormal condition has been caused where the normal record operation cannot be effected when the information is recorded by the optical recording and reproducing means onto the optical disc, a write protecting means for changing from the recording state to the non-recording state the optical power level of the laser light source during the recording operation by said abnormal record detecting means, a diagnostic means for confirming that said abnormal record detecting means and said write protecting means normally operate.
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Accused Products
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.
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Citations
8 Claims
- 1. An optical recording and reproducing apparatus comprising an optical recording and reproducing means for focusing a laser light source onto an optical disc to record or reproduce the information, an abnormal record detecting means which detects that the abnormal condition has been caused where the normal record operation cannot be effected when the information is recorded by the optical recording and reproducing means onto the optical disc, a write protecting means for changing from the recording state to the non-recording state the optical power level of the laser light source during the recording operation by said abnormal record detecting means, a diagnostic means for confirming that said abnormal record detecting means and said write protecting means normally operate.
Specification