Appeal No. 1998-2508
Application 08/626,299
This is a decision on appeal from the final rejec-
tion of claims 1 through 6, all of the claims pending in this
present application.
The invention is generally directed to a system for
focusing laser light on a selected layer in a single-layered
or multilayer optical disk information storage system. In
particular, the present invention is directed to a system in
which a light source is electromagnetically dithered to pro-
duce an electrical signal which is distinctive in terms of its
ability to provide an indication of the position of a focused
spot relative to a track that is being read or written.
In particular, Appellants disclose on page 10 of the
specification that fig. 2 illustrates an apparatus which is
employed to test the principles of the present invention.
Appellants disclose that function generator 60 provides a
dithering signal I = I sin S t. At the same time, the laser0 D
optics setup which includes photodetector 40, diode injection
laser 10, beam collimating crossed fiber 80 and lens 100
results in a production of a signal S. Appellants disclose
that signal S can be represented as a Fourier series with a DC
2
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