Optical disk device

Details Optical disk device Optical disk device

2007-07-24

2010-06-08

Feild, Joseph H (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S053220, C369S053230, C369S053270, C369S053280, C369S053350, C369S044350, C369S053140, C369S044320

Reexamination Certificate

active

07733753

ABSTRACT:
This optical disk device includes a pickup head, a spindle motor, a signal generation unit, a runout amount calculation unit, and an out of balance disk detection unit. The signal generation unit generates a tracking error signal. The runout amount calculation unit controls the rotational speed of the spindle motor to first and second disk rotational speeds, and obtains, at these rotational speeds, runout amounts TE1and TE2of a tracking error signal, and runout amounts FE1and FE2of a focus error signal. And an out of balance disk detection unit detects that this optical disk is an out of balance disk, if the absolute value of (TE2×FE2)/(TE1×FE1) is greater than or equal to a threshold value.

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patent: 2004095079 (2004-03-01), None
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