Anti-skating control of a positioning servo system

Details Anti-skating control of a positioning servo system Anti-skating control of a positioning servo system

1990-09-28

1992-08-25

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 32, 369 4432, G11B 700, G11B 1722

Patent

active

051425165

ABSTRACT:
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.

REFERENCES:
patent: 4730290 (1988-03-01), Takasago et al.
patent: 4914725 (1990-04-01), Belser et al.

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