Appeal No. 1998-2508
Application 08/626,299
period for said oscillatory motion." From this language, in
light of the specification, we find that Appellants' claim 1
requires integrating the same electrical signal that is
produced by the step of converting light into an electrical
signal.
Turning to Kimura, we find that Kimura teaches con-
verting light into an electrical signal by elements 11 and 12
shown in figure 1. See column 3, lines 14 through 19. Kimura
further discloses that the electrical signal is supplied to an
envelope detector 13 to produce an amplitude modulated
component due to the positional modulation of the beam spot.
The detected amplitude modulated component is then supplied to
a sample and hold circuit 15 via a band pass filter 14 for
transmitting a part of the positional modulated signal
component having a given frequency. See column 3, lines 19
through 25. Kimura further discloses that figures 2A, 2B and
2C show how to modulate the beam spot position with respect to
the information track. In particular, figure 2A illustrates
an ideal tracking condition in which a center of the light
spot 1a is vibrated symmetrically on both sides of a center of
7
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