Appeal No. 1997-4025
Application 08/340,958
light modulator having ON defects, i.e., defects in which
pixels of the spatial light modulator are stuck in the ON
state so that light is always transmitted to a photosensitive
surface being exposed using the spatial light modulator
(specification, page 3). In appellants’ claimed method, a
minimum exposure level value, based on the number and position
of ON defects, is determined, the minimum exposure level is
added to all of the latent image generated by exposing a
photosensitive surface using the spatial light modulator, and
the electrophotographic development of the latent image is
controlled such that the minimum exposure level is screened
out during development. Appellants’ claim 1 reads as follows:
1. A method of printing using a spatial light modulator
with ON defects, comprising the steps of:
a. generating a defect map of a spatial light
modulator, wherein said defect map identifies elements with ON
defects;
b. determining a minimum exposure level value to be
added to all exposure level to be added to all exposure level
values, wherein a controller calculates said minimum exposure
level value by determining the number and position of said ON
defects in a column of said spatial light modulator,
c. using said spatial light modulator to generate a
latent image on a photosensitive surface, such that said ON
defects have been minimized by the addition of said minimum
exposure level to all of said latent image; and
-2-2
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