Method and apparatus for cleaning an optical disk head on the basis of time accumulation
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United States of America Patent
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May 27, 1997
Issued Date -
N/A
app pub date -
May 12, 1995
filing date -
Aug 27, 1992
priority date (Note) -
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Abstract
An apparatus for reading information by projecting a light beam from an optical head onto an optical disk rotated by a spindle motor. The rotation time of the spindle motor is measured, and upon reaching a predetermined time, a cleaning request signal is sent to an upper order system. The rotation time of the spindle motor is counted by counting pulses generated with the rotation with a first counter stored in the RAM. Upon reaching a predetermined value by the count of the first counter, a second counter stored in a non-volatile memory is updated. Upon reaching a predetermined value by the second counter, a cleaning request is sent to the upper order system for display on a CRT, and a cleaning request flag in a non-volatile memory is set. When the end of cleaning of the apparatus is recognized, the cleaning request flag in the non-volatile memory is cleared.
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