Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Reexamination Certificate
2005-07-12
2005-07-12
Leykin, Rita (Department: 2837)
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
C318S297000, C318S362000, C318S300000, C388S932000
Reexamination Certificate
active
06917171
ABSTRACT:
A control device and a method of stopping the spindle motor or an optical disc system. The control device primarily includes an optical disc control chip, a motor driving circuit and a spindle motor. The optical disc control chip generates and delivers a spindle motor control signal to the motor driving circuit for driving the spindle motor into rotation. During a first period, the spindle motor control signal level is controlled to produce the largest reversing torque permitted by the spindle motor for braking purpose. During a second period, the spindle motor control signal level decreases gradually to approach to a lock level that is smaller than that for actuating the spindle motor, so that the reversing torque is also decreasing gradually. During a third period, the spindle motor control signal at a level between the lock level and a motor stoppage level indicative of the spindle motor remaining stationary is applied to the motor driving circuit so that a locking torque which has the same rotation direction with that for read-/write-operations is derived in the spindle motor. The locking torque is controlled at a level less than that for actuating the spindle motor again. Finally, the spindle motor remains stationary after the third period terminates.
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Chen Yu-I
Huang Umi
Tsai Tsai-Hsin
J.C. Patents
Leykin Rita
VIA Technologies Inc.
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