| 摘要 |
PROBLEM TO BE SOLVED: To provide the optical recording and reproducing device with stable performances of track jumping and focus jumping against disturbances caused by vibrations to the device, partial eccentricity, partial face wobbling of an optical disk, etc. SOLUTION: At the time of track jumping, the moving time up to the point of the light beam in jumping is measured. Namely, an acceleration end judging part 114 detects that a tracking error signal has reached a fixed level at the time of acceleration, and a moving time measuring part 113 measures the time from beginning of the acceleration. According to the measured time, an acceleration/deceleration pulse generating part 116 changes the waveform of the deceleration pulse and drives a tracking actuator 119. Or, at the time of deceleration, the tracking actuator 119 is forcibly driven until the tracking error signal is decreased to a prescribed level or lower. Focus jumping is also controlled similarly.
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