Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
2005-10-18
2005-10-18
Hudspeth, David (Department: 2651)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
C702S186000
Reexamination Certificate
active
06956802
ABSTRACT:
An AR measuring apparatus receives the reflection light of an optical beam irradiated on an optical recording medium having a recording surface on which pre-pits are repeatedly formed between tracks by means of a first light receiving surface and a second light receiving surface, obtains a push-pull signal based on the difference between light receiving signals from the first and second light receiving surfaces, collects sample data by sampling the push-pull signals for a predetermined period of time, repeats the sampling for the predetermined period of time by a plurality of times, determines whether or not each data value corresponding to a pre-pit position of the sample data by the plurality of times is obtained by a predetermined number of times or greater, and when data values obtained by the predetermined number of times or greater are determined, calculates as an aperture ratio, a ratio between the minimum value and the maximum value of values corresponding to a pre-pit component of the data values obtained by the predetermined number of times or greater.
REFERENCES:
patent: 5062091 (1991-10-01), Maeda et al.
patent: 6545972 (2003-04-01), Kato et al.
patent: 2003/0169676 (2003-09-01), Konishi et al.
patent: 10-283638 (1998-10-01), None
Kato Masahiro
Muramatsu Yuko
Suzuki Shinji
Yanagawa Naoharu
Yone Tatsuhiro
Giesy Adam R.
Hudspeth David
Pioneer Corporation
Sughrue & Mion, PLLC
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