Optical device for reading information
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United States of America Patent
Stats
-
May 22, 2007
Grant Date -
Jun 9, 2005
app pub date -
Dec 11, 2002
filing date -
Dec 19, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical playback or recording device is equipped with mass-unbalance detection means (20) for detecting unbalance on the record carrier (2). Mass-unbalance causes vibration and sound in the optical device when the record carrier (2) is rotated at a relatively high speed. When mass-unbalance is detected, the speed may be reduced to reduce the vibration and sound in the optical device. The mass-unbalance detection means (20) performs the following steps to detect mass-unbalance: a) determining the maximum value U.sub.max1 of the actuator control signal (AS) at a rotational speed .OMEGA..sub.1; b) determining the maximum value U.sub.max2 of the actuator control signal (AS) at a rotational speed .OMEGA..sub.2; c) comparing Formula (I) with Formula (II). If these values are substantially equal, then the effect of mass-unbalance is small, otherwise the effect of mass-unbalance is too great and the speed may have to be reduced.times..times..omega..times..times..times..times..times..times..om-ega. ##EQU00001##
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