Optical disc recording apparatus and method of forming an image on an optical disc

A optical disc recording apparatus comprising:

• an optical pickup which applies a laser beam of substantially constant power to an optical disc;
• a rotating section which rotates the optical disc at a substantially constant speed;
• a feeding section which, each time when the optical disc is rotated with a number of rotations by the rotating section, moves the optical pickup by a movement distance in a radial direction of the optical disc;
• a laser beam irradiation position controlling section which, when the optical disc is rotated with the preset number of rotations by the rotating section, changes an irradiation position of the laser beam so that the laser beam is moved along a different laser irradiation locus on the optical disc in each rotation;
• a detecting section which detects a radial position of the optical pickup with respect to the optical disc;
• and
• a rotation number controlling section which changes the rotation number set in the feeding section in accordance with the radial position of the optical pickup detected by the detecting section.

A method of forming an image on an optical disc comprising steps of:

• rotating the optical disc at substantially constant speed;
• applying a laser beam of substantially constant power to the optical disc by an optical pickup;
• moving the optical pickup by a movement distance in a radial direction of the optical disc;
• and
• changing the movement distance in accordance with the radial position of the optical pickup on the optical disc.

A method of forming an image on an optical disc comprising steps of:

• rotating the optical disc at substantially constant speed;
• applying a laser beam of substantially constant power to the optical disc by an optical pickup;
• moving the optical pickup in a radial direction of the optical disc each time when the optical disc is rotated with a number of rotations;
• changing an irradiation position of the laser beam so that, when the optical disc is rotated with the number of rotations, the laser beam is moved along a different laser irradiation locus on the optical disc in each rotation;
• and
• changing the number of rotations in accordance with the radial in accordance with the radial position of the optical pickup on the optical disc.

An optical disc including a heat-sensitive layer in which an image is formed by discoloring the heat-sensitive layer, the image being formed by the steps of:

• rotating the optical disc at substantially constant speed;
• applying a laser beam of substantially constant power to the optical disc by an optical pickup;
• moving the optical pickup by a movement distance in a radial direction of the optical disc;
• changing the movement distance in accordance with the radial position of the optical pickup on the optical disc.

An optical disc including a heat-sensitive layer in which an image is formed by discoloring the heat-sensitive layer, the image being formed by the steps of:

• rotating the optical disc at substantially constant speed;
• applying a laser beam of substantially constant power to the optical disc by an optical pickup;
• moving the optical pickup in a radial direction of the optical disc each time when the optical disc is rotated with a number of rotations;
• changing an irradiation position of the laser beam so that, when the optical disc is rotated with the number of rotations, the laser beam is moved along a different laser irradiation locus on the optical disc in each rotation;
• and
• changing the number of rotations in accordance with the radial in accordance with the radial position of the optical pickup on the optical disc.