Appeal No. 1997-1323
Application No. 08/117,997
In Takasago, when a detector detects that the center of
the light spot from the laser 41 is not on the centerline of a
track on disk 1 for a predetermined time period, a tracking
error signal is generated to stop recording, and to generate
an off-track signal (column 1, lines 33 through 42). The off-
track signal is caused by shock to the apparatus (Figure 1) or
by a defect on the disk (column 1, lines 61 through 63).
Takasago recognizes that the data should be re-recorded in
another portion of the disk during such an off-track condition
(column 1, lines 42 through 54). In Takasago, the off-track
signal is analyzed
in two stages or two time periods T and T (column 3, lines1 2
28 through 51). A tracking error in Takasago is detected by
light detector 6, and the tracking error signal from
differential amplifier 7 is applied to the + and the - inputs
of differential amplifiers/comparators 17 and 18,
respectively, where it is converted into a pulse having a
level of “1" (column 5, lines
47 through 59). In the absence of a tracking error signal,
the output from the comparators 17 and 18 is level “0" (column
5, lines 59 through 61). Thereafter, the tracking error pulse
5
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Last modified: November 3, 2007