| 摘要 |
A light beam spot moving velocity detector which can accurately detect a velocity in a low velocity range in a seek operation of a light beam spot. The light beam spot moving velocity detector comprises a memory for producing a prestored operation value based on a normalized tracking error signal, a differentiator for differentiating the tracking error signal, and a multiplier for multiplying the output of the memory means with the output of the differentiator. The output of the multiplicate represents the moving velocity of the light beam spot.
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