Patent ID: 6781937
Filing Date: 2004-08-24
Classification: G11B

Abstract:
An optical disk recording device for forming pits and lands based on a mark-length recording scheme by irradiating a laser light beam onto a recording surface of an optical disk, the laser light beam being set to a top power value capable of forming a pit for each pitforming section and set to a bottom power value incapable of forming a pit for each land-forming section between the pit-forming sections, said optical recording device comprising a control unit that, in recording at a speed higher than a normal speed, performs:control to cause end timing of a top power irradiation period of the laser light beam to differ from predetermined end timing of a pit to be formed by a specific amount depending on a desired length of the pit or to cause start timing of the top power irradiation period of the laser light beam to differ from predetermined end timing of a land to be formed by a specific amount depending on a desired length of the land; and control to form and impart a top-power-increasing additional pulse to a portion of the top power irradiation period to temporarily increase a value of the top power value by an amount smaller than a difference between the top power value and the bottom power value and also to vary a time length of the top-power-increasing additional-pulse in accordance with the desired length of the pit.