DIGITAL SERVO FOR OPTICAL DISK DRIVE
First Claim
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1. An optical disk drive, comprising:
- a plurality of photodetectors for receiving reflected light from an optical disk, each photodetector providing a photodetector output signal;
an analog-to-digital converter for converting versions of the photodetector output signals into digital signals; and
a digital signal processor configured to receive the digital signals, the digital signal processor being further configured to determine a focus error signal (FES) and a tracking error signal (TES) from the digital signals, the digital signal processor being further configured to process TES and FES through servo algorithms to produce tracking and focus control signals.
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Accused Products
Abstract
An optical disk drive is provided that includes: a plurality of photodetectors for receiving reflected light from an optical disk, each photodetector providing a photodetector output signal; an analog-to-digital converter for converting versions of the photodetector output signals into digital signals; and a digital signal processor configured to receive the digital signals, the digital signal processor being further configured to determine a focus error signal (FES) and a tracking error signal (TES) from the digital signals, the digital signal processor being further configured to process TES and FES through servo algorithms to produce tracking and focus control signals.
15 Citations
10 Claims
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1. An optical disk drive, comprising:
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a plurality of photodetectors for receiving reflected light from an optical disk, each photodetector providing a photodetector output signal;
an analog-to-digital converter for converting versions of the photodetector output signals into digital signals; and
a digital signal processor configured to receive the digital signals, the digital signal processor being further configured to determine a focus error signal (FES) and a tracking error signal (TES) from the digital signals, the digital signal processor being further configured to process TES and FES through servo algorithms to produce tracking and focus control signals. - View Dependent Claims (2, 3, 4)
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5. A method of driving an optical pickup unit, comprising:
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illuminating an optical disk to produce reflected light;
detecting the reflected light in a plurality of photodetectors to provide a corresponding plurality of photodetector signals;
digitizing versions of the photodetector signals to produce digital signals;
in a digital signal processor, processing the digital signals into either a tracking error signal (TES) or a focus error signal (FES); and
in the digital signal processor, processing TES or FES through a servo algorithm to produce a control signal, the control signal being adapted to drive an actuator such that either TES or FES is minimized. - View Dependent Claims (6, 7)
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8. A servo system, comprising:
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an optical pick-up unit;
an analog-to-digital processor coupled to receive signals from photodetectors in the optical pick-up unit and provide digital signals;
a digital signal processor coupled to receive the digital signals, the processor calculating a focus error signal and a tracking error signal, the processor processing the focus error signal and the tracking error signal through servo algorithms to produce focus and tracking control signals; and
a driver coupled to control a position of the optical pick-up unit in response to the control signals. - View Dependent Claims (9, 10)
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Specification
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Current AssigneeRPX Corporation
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Original AssigneeDPHI Incorporated
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InventorsKadlec, Ron
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current369/30.17
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CPC Class CodesG11B 20/10046 filtering or equalising, e....G11B 20/18 Error detection or correcti...G11B 27/105 of operating discsG11B 27/3027 used signal is digitally codedG11B 7/08505 Methods for track change, s...G11B 7/08529 Methods and circuits to con...G11B 7/08541 involving track counting to...G11B 7/0901 for track following only G1...G11B 7/0908 for focusing only G11B7/092...G11B 7/0917 Focus-error methods other t...G11B 7/094 Methods and circuits for se...G11B 7/0941 Methods and circuits for se...G11B 7/0945 Methods for initialising se...
