Appeal No. 1998-2463 Page 8
Application No. 08/598,854
respect to the magnitude of the biasing voltage. Thus,
Andrews teaches the use of facet tracking in a raster output
scanner, but does not do so by varying the electrical signal
to vary the wavelength of the laser. Rather, Andrews teaches
providing a varying electrical signal to the optical element
50, which has a variable index of refraction.
We find that Appel is directed to (col. 1, lines 10-15)
facet-to-facet wobble correction in a raster output scanner.
Appel discloses (Figures 3 and 4 and col. 4, lines 3-45) the
use of a controller 230 for modulating the wavelength of laser
source 202 so that upon passing through optical beam
deflecting element
206, wobble in a facet of a pyramidal scanner can be corrected
prior to scanning. Appel further discloses an alternate
embodiment (Figures 5 and 6, and col. 5, lines 34-48) wherein
controller 230 provides an electrical signal to optical beam
deflecting element 232 which has a variable index of
refraction. Appel additionally discloses (embodiments of
Figures 7-9, and col. 5, lines 50-58) that the controller can
provide electrical signals to modulate both the wavelength of
the laser source and the variable index of refraction of the
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