Appeal No. 1998-1779
Application No. 08/658,447
Appellants’ Invention
Appellants’ invention relates to cathode ray tubes (CRT’s). A CRT front panel is
provided with a double-layered film to reduce glare and static without noticeable effect
on image resolution. The inner layer formed on the front panel consists of a visible light
absorbing layer containing a black dye to reduce glare. The outer layer is formed on the
light absorbing layer and contains an inorganic metal compound so as to reduce static.
The Prior Art
Morikawa discloses coating the front panel of a Braun tube with a reflection or glare
preventing coat made of SiO2 and with an outer antistatic layer containing a silanol group.
The silanol group absorbs water and thereby reduces the electric resistance of the surface.
Itou relates to a CRT having a front panel covered with an antireflection layer and an
antistatic layer formed on the antireflection layer. The antistatic layer may include a
metallic compound in proportions to impart the desired antistatic characteristics. Itou
discloses that antireflection or light filtering characteristics are manifested in the layer by
adding organic dyes.
Deal discloses a cathode ray tube having an antistatic glare-reducing, image-
transmitting coating on its external viewing surface. The coating is composed essentially
of a silicate material and a metallic compound of at least one element selected from the
group consisting of platinum, palladium, tin and gold. The preferred palladium
compound in the preferred lithium silicate coating is present in concentrations in the
range of 0.005 to 0.02 weight percent of the coating.
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