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| Gate valve |
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Display tube having printed copolymer film layer
| Details |
Inventors: Kato, Hiroshi; Kojima, Toshihisa; Yamazaki, Kazuo;
Assignee: Sony Corporation (Tokyo, JP)
Primary Examiner: DeMeo; Palmer C.
Assistant Examiner: O'Shea; Sandra L.
Attorney, Agent or Firm: Hill, Van Santen, Steadman & Simpson
A display tube such as a cathode ray tube or fluorescent display tube which includes a film layer over the phosphor layer, and including a random copolymer with the following chemical structure: ##STR1## wherein R.sub.1, R.sub.3 represent individually H or CH.sub.3 ; R.sub.2 is H; and X is OH. The layer can be formed over the phosphor layer uniformly and thinly by means of a printing process to thereby shorten the manufacturing process and reduce the cost of manufacture. |
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DETAILED DESCRIPTION I claim as my invention: 1.
A display tube including a phosphor layer, a printed film layer overlying said phosphor layer, and a metal backing layer overlying said film layer, said film layer containing a random copolymer having the following chemical structure: ##STR5## where R.
sub.
1 and R.
sub.
3 are individually either H or CH.
sub.
3 ; R.
sub.
2 is H and X is OH, the ratio of l to n being in the range from 0.
1 to 1 to 10 to 1.
2.
A tube according to claim 1 wherein said copolymer has an average molecular weight of at least 50,000.
3.
A tube according to claim 1 wherein said copolymer has an average molecular weight in the range from 200,000 to 500,000.
4.
A tube according to claim 2 wherein said average molecular weight is in the range from 300,000 to 400,000.
5.
A display tube according to claim 1 wherein said film is in the form of a paste containing a spreading agent.
6.
A display tube according to claim 5 wherein said spreading agent is present in an amount of from 2 to 5% by weight of the total amount of paste.
7.
A display tube according to claim 5 wherein said paste is coated on said phosphor layer by means of a screen printing process.
8.
A tube according to claim 1 wherein said copolymer in a copolymer of allyl alcohol and methylmethacrylate.
Description:
BACKGROUND OF THE INVENTION 1.
Field of the Invention The present invention is directed to a display tube and more specifically relates to a composition for a filming layer formed at the fluorescent surface of a display tube such as a cathode ray tube or a fluorescent display tube.
2.
Description of the Prior Art The fluorescent surface of a cathode ray tube generally comprises a layer coated with red, blue and green phosphor material deposited on a glass panel.
Normally, a film layer is formed over the phosphor layer and then provided with a metal backing.
However, the paste used in the phosphor layer through the normal printing process usually contains, as a binder, an acrylic or polyester resin which is soluble in an organic solvent and, accordingly, an aqueous emulsion lacquer or spray lacquer generally employed in cathode ray tubes or the like cannot be used for forming the material of the film over the phosphor layer since the phosphor layer repels water
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Metal Working 
