Appeal No. 1997-1323
Application No. 08/117,997
signal level “1" is applied to a time-width detector 24 to
check the time duration of the level “1" pulse. If the pulse
exceeds the first time period T , then laser operation is
1
stopped, and if the pulse exceeds the second time period T ,
2
which is longer than T , then a signal is generated indicating
1
an off-track condition (Abstract; column 5, line 67 through
column 6, line 11).
6
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