Appeal 2007-1770
Application 10/632,289
We AFFIRM.
I. BACKGROUND
The invention relates to a method of manufacturing a light-absorbing
matrix for a cathode-ray tube (CRT). The process includes a step of
exposing a photoresist layer to light. Appellants generate the light from
three locations. Two outer source locations are symmetrically located about
an inner source. Claim 1 is illustrative of the invention on appeal:
1. A method of manufacturing a light-absorbing matrix for a cathode-ray
tube (CRT), including a plurality of substantially equally sized openings
therein, on an inner surface of a faceplate panel of the cathode-ray tube
having a color selection electrode spaced from the inner surface of the
faceplate panel, the color selection electrode having a plurality of slots,
comprising the steps of:
(a) exposing a first photoresist layer formed on the interior surface of
the faceplate panel to light through the plurality of slots in the color selection
electrode, wherein the light is generated from three source locations
including two outer source positions and an inner source position, wherein
the two outer source positions are symmetrically located about the inner
source position, and wherein the inner source position is a central source
position;
(b) removing unexposed portions of the first photoresist layer;
(c) overcoating the interior surface of the faceplate panel with a light-
absorbing matrix material;
(d) removing retained portions of the first photoresist layer to form
first guardbands of light-absorbing material on the inner surface of the
faceplate panel; and,
(e) repeating steps (a) through (d) twice more to form second
guardbands of light-absorbing material and third guardbands of light-
absorbing material, using a second photoresist layer and a third photoresist
2
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