Method of detecting defects on an optical record medium and a de

Details Method of detecting defects on an optical record medium and a de Method of detecting defects on an optical record medium and a de

1985-06-14

1988-01-12

Faber, Alan

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 58, 369124, 358336, G11B 700, G11B 2018

Patent

active

047196122

ABSTRACT:
A method of detecting defects formed on an optical record medium for use in an optical information recording and reproducing apparatus. The method comprises steps of deriving light output signals reflected from the record medium at the time of information writing, comprising the light output signals with reference signals which are set to a plurality of desired levels, and logically operating the compared output signals thereby detecting and evaluating the defects formed on the surface of the record medium.

REFERENCES:
patent: 4308612 (1981-12-01), Miyouchi
patent: 4554652 (1985-11-01), Maeda

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