Appeal 2007-3363
Application 10/342,711
glass support. (Hell ¶0047.) Other support materials are taught including
pigmented paper containing titanium dioxide, pigment-coated glass, and
pigment-containing thermostable plastic films. Titanium dioxide and barium
sulfate are suggested as appropriate light-reflecting (white) pigments, with
specific uses (high resolution and high sensitivity, respectively) suggested
for each. (Hell ¶¶043-045.)
Takahashi teaches radiation image storage panels using stimulable
phosphors that store radiation energy and emit light when stimulated.
(Takahashi 1:4-11.) Takahashi teaches a variety of suitable phosphors and
specifically notes that any phosphor may be used as long as it "emits light
when exposed to stimulating rays after exposure to radiation." (Takahashi
6:54-7:30.) A binder is used to deposit the phosphor on a support, but
binders adversely affect panel sensitivity and sharpness, and are thus
preferably minimized. (Takahashi 7:52-8:24.)
Suitable supports include glass, paper, and polymer films. Paper
containing pigment including titanium dioxide is mentioned. (Takahashi
8:25-43.) The support may be colored, but if so the colorant (pigment)
should absorb stimulating rays. Glass or plastic supports may have pigment
on the surface or the pigment may be dispersed throughout the support.
(Takahashi 8:57-9:8.)
Takahashi notes that improving panel sharpness by using a colorant is
known, but warns that colorants can also decrease panel sensitivity. In
addition to absorbing the stimulating radiation, the pigment may also absorb
the emitted radiation. Thus more pigment can result in better resolution, but
less intensity. Takahashi suggests two solutions: (1) using a pigment that
absorbs at different wavelengths than the wavelengths the phosphor emits or
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Last modified: September 9, 2013