Optical disk device

Application Number: 00103031
Application Date: 2000.03.01
Publication Number: 1273413
Publication Date: 2000.11.15
Priority Information: 1999/3/2 JP 054078/1999
International: G11B7/09;G11B21/10
Applicant(s) Name: Matsushita Electric Industrial Co., Ltd.
Inventor(s) Name: Watanabe Katsuya;Fujita. Kentsukasa;Ishihashi Hiromichi
Patent Agency Code: 11021
Patent Agent: wang huimin
Abstract To perform tracking control with a high degree of reliability by driving a moving part of an optical head and controlling it so that a light beam correctly scans on the track according to an output signal of a phase difference track deviation detecting part for converting the deviation into a signal corresponding to a positional relation between the optical beam and the track. Reflected light from a disk 101 is made incident to 4-split photo- detector 114 via a condenser lens 113. A matrix computing element 116 calculates sums of various combinations of the detecting parts A-D of the 4-split photo-detector 114, and generates a phase difference tracking error signal (signal TE). An A/D 112 converts the signal TE, and inputs a signal phTE to a DSP 132, and the DSP 132 outputs a signal TRD and makes a current flow through a tracking actuator 103 via a synthesizing circuit 133 and a driving circuit 134. The converging lens 105 is driven in the tracking direction, and tracking control is performed so that a light beam pot 107 correctly scans the tracks.