Sony Corporation

Toshiro Morimoto

Yoshihiro Tsukamura

Masataka Mukai

Matayasu Kubo

An optical disk driving apparatus comprises an optical pickup device having a laser beam source for emitting a laser beam to a disk recording medium, a unit for rotating the disk recording medium such that a linear velocity of a track on the recording medium accessed by the optical pickup device becomes a predetermined value, a unit for translating the optical pickup device along a radius of the disk recording medium in accordance with a seek signal indicative of the track to be accessed by the optical pickup device, and a unit responsive to the seek signal for controlling both the translating unit and the rotating unit, the translating means being prevented from translating the optical pickup device during a period until the linear velocity of the track desired by the seek signal on the disk recording medium reaches down to a value determined by the linear velocity of the desired track when the seek signal represents the order to transfer the optical pickup device from inner to outer tracks of the disk.

Optical disk driving apparatus with tracking control

This invention relates to an optical disk recording and reproducing apparatus for recording a predetermined signal on and/or reproducing the same from a writable disk which is rotated at a constant linear velocity by using a laser from a laser source. In this case, upon reproducing the above-described signal, if a signal recorded on the inner periphery of the disk is accessed, during the period from this addressing up to the time when the linear velocity at the inner periphery of the disk becomes constant, on the basis of a spindle lock signal, the beam power of the laser from the laser source and irradiating the disk is decreased to thereby prevent useless data from being rewritten on the disk.

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Kanagawa, Japan

Toshiro Morimoto