The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 24, 1989
Filed:
Jun. 22, 1987
Kenji Koishi, Kawabe, JP;
Tamotsu Matsuo, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Kadoma, JP;
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.