Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
2005-08-09
2005-08-09
Miller, Brian E. (Department: 2652)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
C369S059170, C369S059180
Reexamination Certificate
active
06928041
ABSTRACT:
A pre-pit detecting apparatus which, when a light beam is radiated onto an optical recording medium having a recording surface with pre-pits repeatedly formed between tracks, receives light reflected by the recording surface with first and second light receiving faces, obtains the push-pull signal corresponding to the light receiving signals for the first and second light receiving faces, and binarizes the push-pull signal by using a threshold value to generate a pre-pit detection signal. It is judged which area of a plurality of areas including at least a not-yet-recorded area corresponds to a position of the recording surface where the light beam is radiated is performed to judge. Then the threshold value is set in accordance with the judgement result.
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Kato Masahiro
Muramatsu Yuko
Suzuki Shinji
Yanagawa Naoharu
Yone Tatsuhiro
Battaglia Michael V.
Miller Brian E.
Pioneer Corporation
Sughrue & Mion, PLLC
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