US 8,009,540 B2 · Optical disc write control method and optical disc recording apparatus therefor

Abstract

A write control method which varies a write power in response to a recording speed, a recording density, and a type of recording medium, and an optical disc recording apparatus suitable for the write control method. The write control method includes preparing a plurality of standard power values corresponding to recording speeds or recording densities for a plurality of record marks, selecting one of the plurality of standard power values with respect to a record mark to be recorded according to a recording speed or a recording density, and controlling write power of a laser beam according to the selected standard power value. The write control method and apparatus improve recording performance of an optical disc recording apparatus by differently setting write power values according to recording speeds, recording densities, and types of recording media.

Claims12

Dependent claims

A write control method of an optical disc recording apparatus to compare power of an optical signal output from a laser diode with a standard power value and to control power of the laser diode according to the comparison results, the method comprising:

preparing a plurality of standard power values corresponding to combinations of lengths of marks and spaces;
selecting one of the plurality of standard power values according to a determined combination of lengths of marks and spaces;
and
controlling write power of a laser beam according to the selected standard power value.

1 more element

An optical disc recording apparatus to compare power of an optical signal output from a laser diode with a standard power value and to control a power of the laser diode according to the comparison results, the apparatus comprising:

a data determination unit determining a length of a record mark to be recorded;
a write pulse generator generating a write pulse corresponding to the record mark to be recorded according to determination results of the data determination unit;
a laser diode driver driving the laser diode according to the write pulse output from the write pulse generator;
a photo diode detecting an amount of an optical signal output from the laser diode;
a comparator comparing an output of the photo diode and the standard power value;
a calculator controlling output power of the laser diode according to comparison results of the comparator;
and
a controller transferring the standard power value to the comparator,
wherein the controller comprises a plurality of standard power values corresponding to combinations of lengths of marks and spaces, selects one of the plurality of standard power values according to a determined combination of lengths of marks and spaces, and transfers the selected standard power value to the comparator as the standard power value.

6 more elements

Dependencies are inferred from the claim text.

Optical disc write control method and optical disc recording apparatus therefor

Life of this patent

Optical disc write control method and optical disc recording apparatus therefor

Life of this patent

Abstract

Claims12