| 摘要 |
Stable velocity control operations are made possible independent of a circuit constant or the like in digital circuit arrangement. A velocity controlling apparatus comprises a track cross detector, a counter for counting track cross pulses, a sampling device for periodically sampling an output of the counter, and a relative velocity detector for detecting a relative velocity between a light spot and tracks, based upon a difference between a currently sampled value and a prior value sampled by the sampling device prior to the sampling of the currently sampled value. The sampling device periodically samples the output of the counter to count the number of tracks crossed, and a velocity is detected based on the difference, whereby information on detecting velocity may be readily obtained in digital value and the control may be conducted with less errors.
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