Appeal No. 1997-1323
Application No. 08/117,997
Claim 1 is illustrative of the claimed invention, and it
reads as follows:
1. An optical disc apparatus comprising:
an optical pick-up for irradiating a light beam onto
a disc recording medium, and recording information to said
disc recording medium;
tracking error signal generating means for generating
a tracking error signal responsive to a magnitude of a
portion of said light beam which is reflected from said
disc;
comparing means for comparing said tracking error
signal with a predetermined reference level and generating
an output signal when said tracking error signal and said
reference signal are in a predetermined condition
relative to each other;
off-track signal generating means for generating an
off- track signal the level of which is changed when said
light beam is dislocated from the track;
latch means for latching said off-track signal
responsive to the output signal from said comparing means
and outputting a latched off-track signal;
count means, coupled to receive the latched off-track
signal, for outputting a count signal indicating the
number of latched off-track signals received;
reset means for initializing said count means and
said latch means;
a decoder coupled to receive the count signal and
output a tracking-jump detection signal responsive to said
count signal being more than a predetermined value; and
control means for changing a magnitude of the light
3
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