Patent ID: 7006412
Filing Date: 2006-02-28
Classification: G11B

Abstract:
1. An optical disk device for forming a row of pits or marks in an optical disk by intermittently setting a quantity of laser beams that enter the optical disk at a writing laser beam quantity, the optical disk device comprising: a light-receiving element configured to receive returning laser beams; a servo mechanism configured to perform a tracking control operation and a focus control operation on an objective lens based on a light-reception result obtained from the light receiving element, the objective lens configured to focus the laser beams onto the optical disk; and a light quantity controlling means for controlling the writing laser beam quantity based on the light-reception result obtained from the light-receiving element, wherein the light-receiving element is configured to receive the returning laser beams at a plurality of areas that output respective light-reception results; wherein the light quantity controlling means controls the writing laser beam quantity based on the light-reception results obtained from areas at a back side in a direction of scanning with the laser beams of the light-receiving element among the light-reception results obtained from the plurality of areas of the light-receiving element; wherein the optical disk irradiated with the laser beams is irradiated with main beams and side beams, and wherein the light-receiving element includes a light-receiving surface configured to receive returning main beams, the light-receiving surface comprising the plurality of areas that are divided by division lines extending in a radial direction and a circumferential direction of the optical disk; and wherein the light quantity controlling means detects, from a quantity of the laser beams at which it is difficult to form the row of pits or marks in the optical disk, a ratio of a quantity of laser beams of the light-reception results obtained from the areas at the back side in the scanning direction with respect to a light beam quantity of the light-reception results detected at the plurality of areas, and, based on the laser beam quantity ratio, corrects the light-reception results obtained from the areas at the back side in the scanning direction in order to control the writing laser beam quantity.