Control system for optical information reproducing apparatus
First Claim
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.
1 Assignment
0 Petitions
Accused Products
Abstract
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 includes a laser device for generating the light beam, a device such a turntable for rotatably supporting the optical disc or a pickup device for relatively moving the optical disc and the light spot of the light beam, a photoelectric transducer 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 photoelectric transducer producing an electrical signal corresponding to the information data, a circuit for deriving a servo control signal from the reproduced signal, a circuit for modulating the servo control signal to a pulse width modulation (PWM) signal, a device such a turntable drive motor or a pickup transfer motor responsive to the PWM signal for driving the turntable or the pickup device, a circuit for producing a response control signal, and a drive circuit for applying the turntable motor or the pickup transfer motor with a power supply voltage which is changeable in response to the response control signal.
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Citations
38 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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Specification