Optical memory device for recording, reproducing or erasing info

Details Optical memory device for recording, reproducing or erasing info Optical memory device for recording, reproducing or erasing info

1987-02-06

1990-05-08

Stephan, Steven L.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369124, 360 46, 307359, G11B 1112

Patent

active

049244477

ABSTRACT:
An optical memory device for recording, reproducing or erasing information by applying an optical beam such as a laser beam onto a recording medium in which the optical memory device includes a recorded region detecting circuit for detecting information recorded in a specified region formed in the recording medium. The optical memory device also includes a timing control for recording, reproducing or erasing data with the use of one result obtained through detection of a synchronizing signal such as a sector mark indicative of a starting point of an information block and another result obtained through detection in the recorded region detecting circuit. The recorded region detecting circuit contains either of at least one peak hold circuit for detecting a peak level of the playback signal and a low pass filter for smoothing the playback signal, and a comparator for comparing an output obtained through the peak hold circuit or through the low pass filter with a reference voltage.

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Fuji et al., Patent abstracts of Japan (62-124645), group No. P635, vol. 11, No. 342, Nov. 10, 1987.
Fuji et al., Patent abstracts of Japan (62-84453), group No. P617, vol. 11, No. 287, Sep. 17, 1987.

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