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Optical disk drive apparatus

  • US 6,134,197 A
  • Filed: 04/13/1998
  • Issued: 10/17/2000
  • Est. Priority Date: 04/14/1997
  • Status: Expired due to Fees
First Claim
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1. An optical disk drive apparatus having:

  • an optical head for directing a laser beam on to information pits formed in an optical disk, and for obtaining information reproduction signals from the reflected light; and

    phase error detection means that detects a tracking error signal from a mutual phase difference of a group of signals output from a photosensor having a plurality of photosensor elements provided on the optical head;

    said optical disk drive apparatus comprising;

    time difference adjuster that generates mutual arbitrary time difference within said group of signals;

    signal length calculator which calculates the signal length of said information reproduction signals;

    maximum length detector which detects the maximum length of the information reproduction signals in unit time and for outputting a time length value related to maximum time length; and

    altering arrangement for altering the time difference of said time difference adjuster in accordance with said time length value.

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