US 6,445,650 B1Granted

High-speed dynamic actuating system for optical disks

AssigneeDiscovision Associates

InventorChin-Shiong Tsai

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Abstract

Disclosed is a high-speed dynamic actuating system for optical disks, particularly useful in an optical disk drive, wherein a closed-loop approach is used to overcome the diversity between devices and thus meet the requirement for high speed track-accessing and solve the problems in that the convention open-loop track-jumping takes a long period of time to perform segmental adjustment. The pick-up head is activated by applying high-speed dynamic actuation of the lens so as to conform to the pre-determined velocity curve and eliminate the wobble of the lens caused by different track-jumping times in an optical disk drive and a hard disk. In addition, said system can be implemented in an integrated circuit (IC), which is directly controlled by the hardware and thus effectively simplifies the complicated configuration as in the prior art.

Claims12

Dependent claims

A high-speed dynamic actuating system for optical disks, with the high-speed dynamic actuation characteristics of the lens fitting to the pre-determined velocity curve, comprising:

a first gain and a second gain, coupled to a summing element, outputting a TRO signal to said pick-up head of an optical disk drive for controlling the relative velocity of the lens to said pick-up head;
a sledge controller, connected to a sledge motor of an optical disk drive for controlling the relative velocity of said pick-up head to the ground;
a track number counter, connected to the output of said pick-up head for counting the number of tracks;
a velocity estimater, connected to said track number counter for performing estimation of the velocity of said pick-up head;
and
a velocity curve fitting circuit, connected to said velocity estimater for fitting the velocity of said pick-up head to the pre-determined velocity curve;
with both the outputs of said velocity estimater and said velocity curve fitting circuit connected to perform calculation by a summing element, and then delivered to both the input of said lens controller and the input of said sledge controller, so as to form a closed feedback loop.

4 more elements

A high-speed dynamic actuating system for optical disks, comprising:

an optical disk drive having a lens, a pick-up head and a sledge motor;
a lens controller connected to the pick-up head for controlling the relative velocity of the lens to the pick-up head, with the lens controller implemented by using a first-order low-pass filter having the form K1*(z−a)/(z−b);
a sledge controller connected to the sledge motor for controlling the relative velocity of the pick-up head to the ground;
and
wherein the lens controller and the sledge controller each has an input that receives feedback signals from an output of the pick-up head through to form a closed feedback;
where K1, a, b and z are gains.

3 more elements

Dependencies are inferred from the claim text.