Optical disk device setting a gain of an amplifier so that a peak value and a bottom value of wobble signal components coincide
AssigneeTEAC Corporation
InventorsAkira Mashimo, Keishi Ueno
Life of this patent
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Abstract
In this optical disk device, a reflected light of a light beam reflected from a pre-pit-formed side of a track wobbled on a disk is detected as a first detection signal. A reflected light of the light beam reflected from the other side of the track is detected as a second detection signal. The first detection signal and/or the second detection signal are/is amplified with a gain(s) so set that a peak value of a wobble signal component of the first detection signal coincides with a bottom value of a wobble signal component of the second detection signal.
Claims6
An optical disk device causing a light beam to be projected intermittently with different powers on a disk on which a pre-pit is formed beforehand at a peak of a wobble of a track wobbled in radial directions of the disk, the device comprising:
- a first detector detecting a portion of a reflected light of said light beam, the portion being reflected from a side of said track at which said pre-pit is formed;
- a second detector detecting a portion of the reflected light of said light beam, the portion being reflected from the other side of said track;
- a first amplifier amplifying a first detection signal detected by said first detector;
- and
- a second amplifier amplifying a second detection signal detected by said second detector,
- wherein a gain of at least one of said first amplifier and said second amplifier is so set that a peak value of a signal component of said first detection signal, the signal component corresponding to the wobble of said track, coincides with a bottom value of a signal component of said second detection signal, the signal component corresponding to the wobble of said track.
Dependencies are inferred from the claim text.