| 摘要 |
PURPOSE:To raise the responsiveness of an optical system feed servo-system by providing a jump pulse generating part, a jump pulse smoothing part and an adder, and correcting a delay of an input signal to a motor by a filter at the time of quick traverse reproduction. CONSTITUTION:At the time of the quick traverse reproduction, a tracking direction pickup driving signal VT inputted to an input terminal 1 becomes a lamp wave which is varied quickly in proportion to frequency of an inter-track jump, and an output of a filter 2 becomes lower by a voltage DELTAV proportional to a variation speed of VTand a time constant of the filter than VT. On the other hand, a jump pulse generated from a jump pulse generating part 8 becomes a DC voltage proportional to frequency of a jump pulse by a jump pulse smoothing part 9. The DC voltage can be made equal to DELTAV by setting suitably an amplification factor of the smoothing part 9, and by adding this voltage and the output of the filter 2 by an adder 10, a signal for correcting a delay by the filter 2 is obtained, and the responsiveness of a servo-system is raised. |
