Appeal No. 1998-2508
Application 08/626,299
component a plus other sinusoidal and cosinusoidal components
0
in accordance with the equation disclosed on page 10 of Appel-
lants' specifica- tion, line 16. Appellants disclose that the
output from the photodetector 40 is proportional to the vector
cross product of
signals I and S. Appellants disclose that if this product is
integrated over the period of the dithering signal, the result
is shown in equation 2 disclosed on page 10, line 21, of
Appellants' specification.
Appellants disclose that because of the
orthogonality relationships expressed in the equation shown on
the top of page 11 of Appellants' specification, it is seen
that the resultant output R is proportional to the magnitude
of coefficient a . Appellants disclose that this magnitude
1
represents the distance from the focal plane to the desired
position. Appellants disclose that this is an important
property because it provides a feedback control mechanism for
precisely aligning the lens.
Independent claim 1 is reproduced as follows:
3
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