US 6,606,282 B2 · Long seek control system and method in an optical storage device

Abstract

The long seek control system and method include a reference velocity mapping unit that obtains a reference velocity when the dual actuator is moved by the residual track count; a velocity estimator for outputting an estimated velocity and obtaining a sled control effort by subtracting the estimated velocity from the reference velocity; and an electrical damper for receiving the sled control effort and simultaneously receiving the displacement of the dual actuator to output a damping control effort to the fine actuator, and reduce the vibration of the fine actuator during the long seek operation. In the reference velocity mapping unit, a reference velocity curve is used to describe the mapping relation between the residual track count and the reference velocity. The reference velocity curve includes a linear part and several quadratic parts with different quadratic functions.

Claims13

Dependent claims

A long seek control system of an optical storage device for receiving a target track and controlling a dual actuator of the optical storage device, the dual actuator comprising a sled actuator and a fine actuator, the long seek control system comprising:

a reference velocity mapping unit for receiving a residual track count, which is the subtraction of the target track and an actual track, and obtaining a reference velocity for the dual actuator;
a velocity estimator for receiving the actual track and outputting an estimated velocity, the subtraction of the reference velocity by the estimated velocity corresponds to a sled control effort;
and
an electrical damper for receiving the sled control effort and simultaneously receiving the displacement of the dual actuator, so as to output a damping control effort to the fine actuator for reducing vibration of the fine actuator during a long seek process,
wherein a reference velocity curve in the reference velocity mapping unit is used to represent a mapping relation between the residual track count and the reference velocity, and the reference velocity curve comprises a linear part and a plurality of quadratic parts corresponding to different quadratic function.

2 more elements

A long seek control method for an optical storage device in a control system, the control system is used to receive a target track and control a dual actuator of the optical storage device, wherein the position of the dual actuator corresponding to the displacement of the dual actuator, the dual actuator comprising a sled actuator and a fine actuator, the long seek control method comprising:

(a) performing a subtraction operation between a target track and an actual track to obtain a residual track count and generate a reference velocity according to the residual track count for the dual actuator;
(b) generating an estimated velocity according to the actual track, wherein the subtraction of the reference velocity by the estimated velocity corresponds to a sled control effort;
and
(c) generating a damping control effort according to the sled control effort and the displacement of the dual actuator, wherein the damping control effort is outputted to the fine actuator to reduce the vibration of the fine actuator during a long seek process;
wherein in the step (a), a reference velocity curve is used to represent a mapping relation between the residual track count and the reference velocity, and the reference velocity curve comprises a linear part and a plurality of quadratic parts corresponding to different quadratic functions.

2 more elements

Dependencies are inferred from the claim text.

Long seek control system and method in an optical storage device

Life of this patent

Long seek control system and method in an optical storage device

Life of this patent

Abstract

Claims13