Access control apparatus for optical disk according change of track pitch
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United States of America Patent
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Jan 7, 1997
Issued Date -
N/A
app pub date -
Jun 15, 1995
filing date -
May 8, 1992
priority date (Note) -
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status (Latency Note)
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Abstract
An access control apparatus, with which a certain tracking and a stable accessing operation are possible even if a track density changes, wherein a track pitch discriminator to determine a difference in track density, that is a track pitch, is provided, detecting characteristics of a tracking error generator and a velocity detector, and a relationship between a counting value in a track counting circuit and an output from a reference velocity generator are changed in accordance with a result of the determination on the difference in track density, a tracking error signal corresponding to a dislocation of a light spot on an optical disk is obtained even if the track pitch changes, a relative speed of a positioner to the track is determined exactly, and an instructed speed corresponding to a distance to an objective track is settled.
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