G - Physics – 11 – B
Patent
G - Physics
11
B
G11B 7/085 (2006.01) G11B 7/09 (2006.01)
Patent
CA 2046696
TU9-90-033 ANTI-SKATING CONTROL OF A POSITIONING SERVO SYSTEM ABSTRACT OF THE DISCLOSURE A servo positioning system, such as used in an optical disk or other types of disk drives includes focus and positioning servo circuits. When a focus error is detected, then it is desired to stop the operation of the positioning system. Similarly, when a positioning error is detected, such as excessive speed or a non-zero velocity at the end of a seek or positioning motion, the head carriage should also be stopped. The stopping of the head carriage is by dynamic braking through use of a power amplifier which is switched from a transconductance mode used during normal servo positioning operations to a voltage amplifying mode which is set to a zero input for dynamically braking the servo positioning system to a safe speed and thence to a stop condition whereupon further error recovery procedures may be employed.
International Business Machines Corporation
Na
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