Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
2011-06-07
2011-06-07
Agustin, Peter Vincent (Department: 2627)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
C369S044230, C369S053190
Reexamination Certificate
active
07957242
ABSTRACT:
An optical pickup inspection device3sends to an actuator drive circuit16a command for changing defocus offset amount to set defocus offset amounts, and calculates jitter values for each of the defocus offset amounts based on a reproduction signal from a reproduction signal generation circuit14. Then, the device3determines a quadric approximating curve of jitter values relative to the defocus offset amounts and calculates a correlation coefficient R2of the quadric approximating curve and measured values. If the correlation coefficient R2is lower than a threshold value, the setting of defocus offset amounts and the calculation of jitter values are executed once again, otherwise, a defocus offset amount corresponding to a bottom value of jitter in the quadric approximating curve is determined as an optimum value of the defocus offset amount. Thus, a less-error, high-accuracy optimum value of the defocus offset amount can be obtained.
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Agustin Peter Vincent
Morrison & Foerster / LLP
Sharp Kabushiki Kaisha
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