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Method of forming a fluorescent screen for cathode-ray tube
| Details |
Inventors: Hinosugi, Misturu; Nakasato, Kouichi;
Assignee: Hitachi, Ltd. (Tokyo, JP)
Primary Examiner: Hoffman; James R.
Assistant Examiner:
Attorney, Agent or Firm: Pfund; Charles E.
A method of forming a fluorescent screen for a cathode ray tube comprises forming a phosphor layer on the inner surface of a panel, coating the panel inner surface and the phosphor layer with an aqueous emulsion of water insoluble filming resin in order to form a base layer which is evaporative, forming a metal film upon the base layer and evaporating organic substances of the base layer coated upon the panel inner surface. The phosphor layer, while it is still wet, is coated with the aqueous emulsion of water insoluble filming resin of which pyrolysis temperature is not greater than 420.degree. C. to form the substrate layer. |
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DETAILED DESCRIPTION Accordingly, an object of the present invention is to eliminate the aforementioned drawbacks and to provide a method of forming a fluorescent screen for a cathode-ray tube wherein an excellent base layer can be formed with the use of filming emulsion containing a minimized amount of water-insoluble resin.
In order to attain the above object, this invention is featured by coating a phosphor layer, when still wet, with an aqueous emulsion of water insoluble film forming resin which has a minimum film forming temperature of 10.
degree.
to 45.
degree.
C.
, remarkably lower than the conventionally used temperatures, and excellent pyrolysis characteristics (below 420.
degree.
).
In the present method, since the filming emulsion is coated on the phosphor layer when the layer is still wet with gaps between phosphor powders filled with water, the resin contained in the emulsion can not easily permeate into the gaps; therefore, an emulsion containing relatively small amount of resins suffices the formation of a base layer of the resin film on the phosphor film, which base layer is thin but satisfactory for filming.
And, since a film of the filming emulsion according to the present invention is formed at a low temperature, the heat evaporation step can be simplified to produce a metal film which is uniformly flat without blisters and with excellent reflection factor.
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Metal Working 
