Sony Corporation

Seiichiro Oishi

Tetsuhiro Shiomi

Ryuji Takeda

Yasushi Saito

Takahiro Komazaki

Mitsuhiko Awata

A disk drive apparatus for recording (writing) and/or reproducing (reading) information on an optical disk by rotating the optical disk, and adjusting the tilt angle of an optical pickup device with respect to the optical disk. A spindle chassis rotationally supports a turntable on which the optical disk is placed. A pickup chassis, rotationally supported on said spindle chassis, movably supports an optical pickup device that writes and/or reads the information to/from the optical disk and is movable toward and away from the turntable. A tilt mechanism adjusts the tilt angle of the optical pickup device with respect to the optical disk by rotating the pickup chassis with respect to the spindle chassis.

Apparatus and method for adjusting the tilt angle of an optical pickup device

The object of the present invention is to propose an optical disk driving apparatus, an optical disk driving method and an optical disk apparatus capable of reducing the occurrence of disturbance to focus servo control and tracking servo control. In the optical disk driving apparatus, a tilt driving section ( ) is provided with waveform shaping unit for shaping a driving current waveform driving a tilt motor ( ) for changing the angle of an optical pickup ( ) with respect to the rotating surface of an optical disk. Thus, it is possible to prevent the vibration of the optical pickup ( ), to reduce disturbance derived from the vibration of an objective lens ( ) to focus control and tracking control and to suppress mechanical noise while tilt driving is being performed. Besides, since there is no need to provide a tilt sensor, the optical pickup ( ) can be made small in size and therefore, the smaller-sized optical disk driving apparatus can be provided.

Optical disk driving apparatus, optical disk driving method and optical disk apparatus

A slide-feed drive part ( ) uses a stepping motor as a slide-feed motor for changing the position of a optical pick-up ( ) with respect to the rotation surface of an optical disk ( ), and has a micro-controller ( ) provided therein and a slide-feed motor controller ( ) both for correcting drive current waveforms to drive the stepping motor. Therefore, by correcting the motor driving waveforms, the optical pick-up ( ) can be linearly moved with respect to the rotation of the slide-feed motor ( ). It is thereby possible to do away with a position sensor and make a fine positional control of the optical pick-up ( ) with no variation. As a result of this, it is possible to provide an optical disk driving apparatus, an optical disk driving method, and an optical disk apparatus, which enhances the linearity of the rotation of the motor with a simple construction.

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Tokyo, Japan

Seiichiro Oishi