Optical disk drive apparatus
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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Abstract
An optical disk drive apparatus drives an optical disk at a constant angular velocity (CAV). The optical disk is formatted under constant linear velocity (CLV). The phase error changes linearly from the inner most track to the outer most track. Tack pulse counter is provided to detect the radial position of the optical head on the optical disk. Calculators are provided to correct the phase error according to the radial position of the optical head.
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Citations
5 Claims
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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. - View Dependent Claims (2, 3, 4, 5)
- 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
Specification