US 2007/0183285 A1Published application

Optical disk apparatus and recording parameters setting method

OwnerKoichiro Nishimura, Toru Kawashima +2inventors

InventorsKoichiro Nishimura, Toru Kawashima, Tsuyoshi Toda, Atsushi Yamada

Life of this patent

Estimating the term…

Loading patent…

Abstract

An optical disk apparatus and a recording parameters setting method are provided to more effectively execute recording parameter learning during data recording on the optical disk, thereby shortening the time required for setting an optimum recording parameter. A phase error detection unit detects a phase error amount from a reproduction signal of actual data being recorded. A phase error adjustment unit adjusts recording parameters (recording strategy) set by a recording parameters setting unit based on the detected phase error amount. The phase error amount detection is executed simultaneously with a verify process of the actual data. If a verify process judgment results says that a target quality is not attained, test writing by a test signal is not executed but the adjustment of recording parameters is conducted on the basis of the phase error amount.

Claims9

Dependent claims

An optical disk apparatus capable of adjusting recording parameters of a laser beam when recording data by irradiation of a laser beam onto an optical disk, the apparatus comprising:

a spindle motor which rotates the optical disk;
a pickup which irradiates the laser beam onto the optical disk and records and reproduces the data;
a signal processing unit which generates a record signal of the data, supplies the signal to the pickup, and generates a reproduction signal of the data from a detection signal of the pickup;
a recording parameters setting unit which sets the recording parameters when the pickup records the data;
a recording quality judgment unit which judges recording quality from the reproduction signal generated by the signal processing unit;
a phase error detection unit which detects a phase error amount from the reproduction signal generated by the signal processing unit;
a phase error adjustment unit which adjusts the recording parameter set by the recording parameters setting unit on the basis of the phase error amount detected by the phase error detection unit;
a memory which stores the recording parameter set by the recording parameters setting unit when the data is recorded;
and
a control unit which controls the data recording and reproducing operations and the recording parameter setting operation,
wherein, when the memory already stores recording parameters, the control unit does not execute test writing but initially sets a recording parameter referring to the stored recording parameter, records the data in predetermined unit in a data recording region on the optical disk, reproduces the recorded data to judge recording quality thereof with the recording quality judgment unit and simultaneously, executes detection of a phase error amount with the phase error detection unit, and adjusts the recording parameter by the phase error adjustment unit based on the phase error amount detected by the phase error detection unit if a judgment result of the recording quality judgment unit verifies that a target quality is not satisfied.

8 more elements

A recording parameters setting method during data recording by irradiation of a laser beam onto an optical disk, the method comprising the steps of:

storing a recording parameter set during the data recording in a memory or in a predetermined area of the corresponding optical disk;
if the memory or the optical disk already stores recording parameters, not executing a test writing process but initially setting a recording parameter referring to the stored recording parameters, recording the data in predetermined unit in a data recording region on the optical disk, reproducing the data, and conducting a recording quality judgment process judging recording quality from the reproduction signal obtained by reproducing the recorded data;
detecting a phase error amount from the reproduction signal simultaneously with the recording quality judgment process;
and
if target quality is not attained according to a recording quality measurement result, adjusting recording parameters of the laser beam for use in recording the data, on the basis of the detected phase error amount.

2 more elements

Dependencies are inferred from the claim text.