US 6,714,378 B1 · Positioning method, positioning device and disk device

Abstract

A positioning method and a positioning device are disclosed for controlling an actuator and moving it to a target position. The positioning method generates a random wave signal RN and detects a position error from the target position. The servo control signal CV is generated to position the actuator back to the target position, and the random wave signal RN is added to the servo control signal CV to generate a control signal. Since a random, minute vibration is constantly applied to the actuator to avoid the assumption of a static state by bearings of the actuator, the actuator is affected only by dynamic friction, and relative to the control value, its movement is representative of a linear characteristic. As a result, the positioning accuracy is enhanced, and since the random wave is employed, there is no deterioration of the positioning accuracy of the servo system.

Claims20

Dependent claims

A positioning method for position-controlling an actuator to a target position comprising steps of:

generating a random wave signal;
detecting a positional error to said target position for said actuator;
producing a servo control signal to position said actuator to said target position from said positional error;
adding said random wave signal to said servo control signal to produce a control signal of said actuator during track following so as to reduce a static friction of bearings in said actuator and prevent said bearings in said actuator from assuming a static state;
and
driving said actuator in accordance with said control signal.

3 more elements

Dependencies are inferred from the claim text.

Positioning method, positioning device and disk device

Life of this patent

Positioning method, positioning device and disk device

Life of this patent

Abstract

Claims20