Optical disk apparatus

Abstract

An optical disk apparatus includes: a servo control unit, operable to execute a servo control of focusing based on a focus error signal and to execute a servo control of tracking based on a tracking error signal; a detrack regulating unit, operable to execute a detrack regulation for setting an offset voltage, which is to be added to the tracking error signal, to be a voltage for giving the highest signal quality of an output of an optical pickup; and a defocus regulating unit, operable to execute a defocus regulation for setting an offset voltage, which is to be added to the focus error signal, to be a voltage for giving the highest signal quality of the output of the optical pickup. The defocus regulation is executed in a state in which the servo control of the focusing and the servo control of the tracking are executed. The defocus regulation is executed after the detrack regulation is executed, in the state in which the servo control of the focusing and the servo control of the tracking are executed.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram showing an electrical structure of a front end of a DVD player according to an embodiment of an optical disk apparatus in accordance with the invention.

FIG. 2 is a block diagram showing a detailed electrical structure of an RF signal processing unit.

FIG. 3 is a flowchart showing a main operation according to an embodiment in an initialization when an optical disk is exchanged.

FIG. 4 is a flowchart showing a main operation according to the related art in an initialization when an optical disk is exchanged.

Claims

1. An optical disk apparatus comprising: servo control means for executing a servo control of focusing based on a focus error signal and executing a servo control of tracking based on a tracking error signal;detrack regulating means for executing a detrack regulation for setting an offset voltage, which is to be added to the tracking error signal, to be a voltage for giving a maximum amplitude of an RF signal generated by an output of an optical pickup; anddefocus regulating means for executing a defocus regulation for setting an offset voltage, which is to be added to the focus error signal, to be a voltage for giving the maximum amplitude of the RF signal, whereinthe defocus regulation is executed in a state in which the servo control of the focusing and the servo control of the tracking are executed,the tracking error signal is generated by a DPD method,the defocus regulation is executed after the detrack regulation is executed, in the state in which the servo control of the focusing and the servo control of the tracking are executed,a rotating speed of an optical disk in execution of the detrack regulation is a speed approximating to a rotating speed in reproduction of the optical disk, andthe defocus regulation is executed after the detrack regulation is executed when the optical disk is a CD, and the defocus regulation is executed without executing the detrack regulation when the optical disk is a DVD.

2. An optical disk apparatus comprising: a servo control unit, operable to execute a servo control of focusing based on a focus error signal and to execute a servo control of tracking based on a tracking error signal;a detrack regulating unit, operable to execute a detrack regulation for setting an offset voltage, which is to be added to the tracking error signal, to be a voltage for giving the highest signal quality of an output of an optical pickup; anda defocus regulating unit, operable to execute a defocus regulation for setting an offset voltage, which is to be added to the focus error signal, to be a voltage for giving the highest signal quality of the output of the optical pickup, whereinthe defocus regulation is executed in a state in which the servo control of the focusing and the servo control of the tracking are executed,the defocus regulation is executed after the detrack regulation is executed, in the state in which the servo control of the focusing and the servo control of the tracking are executed.

3. The optical disk apparatus according to claim 2, wherein the tracking error signal is generated by a DPD method, anda rotating speed of the optical disk in execution of the detrack regulation is a speed approximating to a rotating speed in reproduction of the optical disk.

4. An optical disk apparatus comprising: a servo controller, operable to execute a servo control of focusing of an optical pickup based on a focus error signal and to execute a servo control of tracking of the optical pickup based on a tracking error signal;a detrack regulator, operable to execute a detrack regulation for regulating an offset voltage which is to be added to the tracking error signal for improving output of the optical pickup; anda defocus regulator, operable to execute a defocus regulation for regulating an offset voltage which is to be added to the focus error signal for improving the output of the optical pickup, whereinunder a condition in which the servo control of the focusing and the servo control of the tracking are executed, the defocus regulation is executed after the detrack regulation is executed.