Dynamic information storage or retrieval – Binary pulse train information signal – Binary signal processing for controlling recording light...
Reexamination Certificate
2005-09-09
2009-06-02
Nguyen, Hoa T (Department: 2627)
Dynamic information storage or retrieval
Binary pulse train information signal
Binary signal processing for controlling recording light...
C369S059170
Reexamination Certificate
active
07542394
ABSTRACT:
The invention provides a method effective in detecting a reproduction signal in real time correction in which correction is simultaneously performed with recording. In this method, a laser beam emitted from a laser diode110is divided into a plurality of beam spots by a diffraction grating114. One of the plurality of beam spots is used as a beam spot for recording, and another beam spot is used as a beam spot for reproduction. Reflected light components obtained from these beam spots are independently detected by a detector122. A period for which a recording laser beam is in an ON state is referred to as a gate signal, and a mask is put on an RF signal obtained from a beam spot for reproduction, thereby selectively detecting pits reproduced when the recording laser beam is in the ON state.
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Kakimoto Hiroya
Kubo Tetsuharu
Miyazawa Fuyuki
Sato Yoshikazu
Sekiguchi Mitsuo
Fischer Mark
Knobbe Martens Olson & Bear LLP
Nguyen Hoa T
Taiyo Yuden Co. Ltd.
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