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Control system for optical information reproducing apparatus

  • US 4,783,774 A
  • Filed: 12/23/1986
  • Issued: 11/08/1988
  • Est. Priority Date: 12/24/1985
  • Status: Expired due to Fees
First Claim
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1. A control system for an optical disc information reproducing apparatus in which information data stored in an optical disc is read out during a rotation of the optical disc by a light spot of a light beam, the system comprising:

  • means for producing the light beam;

    means for relatively moving the optical disc and the light spot of the light beam;

    means responsive to the light beam reflected from the optical disc for reproducing the information data from the optical disc during the rotation of the optical disc, the reproducing means producing an electrical signal corresponding to the information data;

    means for deriving a servo control signal from the reproduced signal;

    means for modulating the servo control signal to a pulse width modulation (PWM) signal;

    means for amplifying the PWM signal;

    means for producing a response control signal,means responsive to the amplifying means for driving the moving means; and

    means for applying the amplifying means with a power supply voltage which is changeable in response to the response control signal.

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