Patent ID: 6195319
Filing Date: 2001-02-27
Classification: G11B

Abstract:
A position control device for an optical pickup which optically performs at least one of recording a signal in a track on a disk and reproducing a signal from a track on said disk, said position control device comprising:a servo circuit which performs (a) position control which causes light projected by said optical pickup to follow a target track such that the light from said optical pickup substantially follows a centerline of the track, and (b) position control which adjusts a focus position of light projected by said optical pickup such that the light from said optical pickup is substantially focused on said disk;digitizing means, which digitize two deviation signals, outputted from said optical pickup, which express a quantity of deviation of said optical pickup from a target position which is the object of at least one of said position control (a) and said position control (b);difference signal producing means, which, based on the digitized deviation signals, produce a difference signal between the two deviation signals;correction value calculating means, which, based on the digitized deviation signals, calculate balance correction values to be applied to the two deviation signals in order to correct balance therebetween; or, based on the digitized deviation signals, the difference signal obtained from the two deviation signals, and a previously set standard value unique to said position control device, calculate gain correction values to be applied to the two deviation signals in order to correct gain of the deviation signals in said servo circuit; andcorrecting means, which correct balance based on the balance correction values, or correct gain based on the gain correction values.