M-O disk recording apparatus with light amount control based on multiple test performed on a test region at multiple disk rotational velocities
AssigneeSony Corporation
InventorShigeaki Koike
Life of this patent
Estimating the term…
Abstract
To determine the optimum recording light amounts for all recordable regions of each optical disk in a relatively short time, information is recorded on the try-to-write region 4 on the inside of the innermost periphery of the rewritable region 2 of the optical disk 1 while rotating it at linear velocities equal to the recording velocities of at least two positions (radii R1, R2) in the radius direction A within the rewritable region 2, and the optimum recording light amounts are measured. Then, the optimum recording light amounts for all velocities in the rewritable region 2 are determined by an interpolation or extrapolation processing 26 of the measured optimum recording light amounts at the two velocities.
Claims18
Optical disk recording apparatus comprising:
- a disk drive for rotating an optical disk;
- a light source for recording information on the optical disk;
- recording light amount control means for controlling an amount of light emitted by said light source during recording;
- reproduction means for reproducing recorded information to produce a reproduced signal;
- system control means for controlling said light source and said recording light amount control means to record first and second test data in a predetermined test region of the disk while controlling said disk drive to rotate the disk during recording of said first and second test data at respective first and second different angular velocities such that linear velocities of the test region at said first and second angular velocities are equal to linear velocities of two different radial positions of the disk during information recording, and for controlling said reproduction means to reproduce the first and second test data and for determining respective first and second optimized recording light amounts in accordance with the reproduced first and second test data;
- said system control means comprising computing means for computing recording light amounts for other radial positions on the disk from the first and second optimized recording light amounts;
- and
- means for setting recording light amount used in information recording in accordance with the reproduced first and second test data.
An optical disk recording method comprising the steps of:
- recording first and second test data on a test region of an optical disk using a light source while rotating the disk at respective first and second different angular velocities such that linear velocities of the test region undergoing recording are equal to linear velocities of two different radial positions of the disk used during information recording;
- reproducing the recorded first and second test data;
- determining respective first and second optimized recording light amounts in accordance with reproduced first and second test data;
- computing recording light amounts for other radial positions of the disk from the first and second optimized recording light amounts;
- and
- setting the recording light amount of the light source for information recording in accordance with the first and second test data, first and second optimized light recording amounts and computed light recording amounts.
Dependencies are inferred from the claim text.