Appeal No. 1998-2508
Application 08/626,299
the track 5a. In this case, the amplitude modulated component
in the envelope signal detected by the envelope detector 13
has a frequency which is equal to twice
of the wobbling frequency as shown in figure 3A. See column
3, lines 39 through 47. Kimura further discloses that figures
2B and 2C illustrate out-of tracking conditions in which the
center of the beam spot 1a is shifted in the radial direction
outwardly and inwardly, respectively. The amplitude modulated
signals having a frequency equal to the wobbling frequency and
an amplitude proportional to the deviation is shown in figures
3B and 3C. See column 3, lines 48 through 56. Appellants
disclose that the band pass filter 14 is provided for
selecting the amplitude modulated component having the
wobbling frequency and therefore, in the ideal tracking
condition shown in Fig. 2A, the amplitude modulated component
is not transmitted through the filter. See column 3, lines 57
through 62.
Kimura further discloses by referring to fig. 1 that
the amplitude modulated signal from the band pass filter 14 is
8
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