Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
2008-05-27
2008-05-27
Patel, Gautam R. (Department: 2627)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
C369S044110
Reexamination Certificate
active
10856855
ABSTRACT:
The invention is disclosed a method for promptly protecting a voice coil motor in an optical disk drive. A step (A) allows a data signal processor (DSP) to execute a protect module of the voice coil motor every preset time interval. In a step (B), the DSP executes following further steps during executing the protect module. A step (b1) reads tracking error (TE)/focusing error (FE) and determines if the TE/FE is over a safety range. A step (b2) starts a gain decrease operation of a signal amplifier if the TE/FE in step (b1) has been over the safety range for more than the first preset number of times so as to lower the control current outputting to the voice coil motor. A step (b3) starts an operation of speed reduction and a low current operation of a controller to secure the voice coil motor being safe if the TE/FE in step (b1) has been over the safety range for more than a second preset number of times.
REFERENCES:
patent: 4489259 (1984-12-01), White et al.
patent: 4609954 (1986-09-01), Bolton et al.
patent: 4683560 (1987-07-01), Takeuchi et al.
patent: 4949201 (1990-08-01), Abed
patent: 6041030 (2000-03-01), Ohmi
Bacon & Thomas PLLC
Behavior Tech Computer Corp.
Patel Gautam R.
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