Pre-pit detecting apparatus detecting pre-pit signal from...

Details Pre-pit detecting apparatus detecting pre-pit signal from... Pre-pit detecting apparatus detecting pre-pit signal from...

2005-10-18

2005-10-18

Patel, Gautam R. (Department: 2655)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S044340

Reexamination Certificate

active

06956800

ABSTRACT:
When record information is recorded on a recording medium with recording control information pre-recorded thereon by forming pre-pits so that the recording control information will be used to control the recording of the record information to be recorded on the recording medium, a first light beam having first power and a second light beam having second power different from the first power are irradiated to the pre-pits on a time-shared basis according to the record information to generate read signals generated from electrical signals according to the amounts of reflected light of the respective beams so that the pre-pits will be detected from inputs of the read signals. In this configuration, the pre-pits are detected from only the read signals input during a period of irradiation of the second light beam.

REFERENCES:
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patent: 6160773 (2000-12-01), Maegawa et al.
patent: 6181657 (2001-01-01), Kuroda et al.
patent: 6246660 (2001-06-01), Yanagawa
patent: 6522608 (2003-02-01), Kuroda
patent: 0 751 506 (1997-01-01), None
patent: 0 871 169 (1998-10-01), None

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