Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
2006-10-03
2006-10-03
Nguyen, Hoa T. (Department: 2656)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
C369S047400, C369S047550, C388S811000, C388S907500, C318S599000
Reexamination Certificate
active
07116622
ABSTRACT:
A method for controlling the rotation speed of an optical storage device. In the first mode, a first signal is produced, and in the second mode, a second signal is produced. In one mode, a first pulse of a first voltage and a second pulse of a second voltage are sent to the motor, which causes the motor to produce a first armature current and a second armature current. In another mode, a DC signal of a third voltage is produced, which causes the motor to produce a third armature current. The armature currents are detected, and test voltages are outputted. The first and second voltages, and the first and second test voltages are used to find a motor coefficient. The third voltage, the motor coefficient, and the third test voltage are used to calculate a motor rotation speed. The calculated speed is used to control the real motor speed.
REFERENCES:
patent: 4672595 (1987-06-01), Senso
patent: 4719400 (1988-01-01), Kurakake et al.
patent: 5451846 (1995-09-01), Peterson et al.
patent: 5777447 (1998-07-01), Okano
Hsu Winston
MediaTek Inc.
Nguyen Hoa T.
Pham Van T.
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