US4423128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making picture tube fluorescent screen
Assignee: Toshiba Corp
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Filing: 1982-09-20
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Granted: 1983-12-27
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Expires: 2002-09-20
Abstract
Abstract There are disclosed a composition for making a picture tube fluorescent screen characterized by essentially consisting of a light-sensitive resin at least having recurring units (1) and (2) represented by the formulas: ##STR1## wherein R and X - have the same meanings as defined in the specification, and CaS-based phosphor particles surface-coated with SiO 2 which are dispersed in an aqueous medium, and a method of making a picture tube fluorescent screen using the same. According to this invention, it is possible to make a picture tube exhibiting an excellent light emitting efficiency and a contrast by a simple process.
Inventors
- 👤 Norio Koike
- 👤 Takeshi Takahara
- 👤 Yasuhiro Shirakawa
- 👤 Kunihiro Ikari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:06
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/20; G; G03; G03F; G03F7/00; G03F7/004; G03F7/027; G03F7/032; G03F7/038
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
129 words
A method of making a picture tube fluorescent screen, comprising the steps of applying, to the inner surface of a face plate panel of a picture tube, a composition essentially consisting of a light-sensitive resin at least having recurring units (1) and (2) represented by the following general formulas: ##STR3## in which R designates a hydrogen atom, an alkyl group or a lower hydroxyalkyl group, and X - designates an anion of a strong acid, and CaS-based phosphor particles surface-coated with SiO 2 , said light-sensitive resin and said CaS-based phosphor particles being dispersed in an aqueous medium; exposing the coat thus formed to light in a required pattern by use of a mask; developing and then baking the coat to form a fluorescent screen in a required pattern.
Claim 2
Independent Claim
129 words
A method of making a picture tube fluorescent screen, comprising the steps of applying, to the inner surface of a face plate panel of a picture tube, a composition essentially consisting of a light-sensitive resin at least having recurring units (1) and (2) represented by the following general formulas: ##STR3## in which R designates a hydrogen atom, an alkyl group or a lower hydroxyalkyl group, and X - designates an anion of a strong acid, and CaS-based phosphor particles surface-coated with SiO 2 , said light-sensitive resin and said CaS-based phosphor particles being dispersed in an aqueous medium; exposing the coat thus formed to light in a required pattern by use of a mask; developing and then baking the coat to form a fluorescent screen in a required pattern.
Claim 3
Dependent Claim
30 words
A method of making a picture tube fluorescent screen according to claim 1, wherein X - is a halogen ion, a sulfate ion, a phosphate ion or a p-toluenesulfonate ion.
Claim 4
Dependent Claim
32 words
A method of making a picture tube fluorescent screen according to claim 1, wherein light-sensitive resin contains 0.1 to 10 mol % of the recurring unit represented by the general formula (1).
Claim 5
Dependent Claim
50 words
A method of making a picture tube fluorescent screen according to claim 1, wherein SiO 2 coated on said CaS-based phosphor forms a continuous coat on almost all the surface of the phosphor, and the required coat weight is in the range between 0.001% and 4.0% based on the phosphor.
References Cited (Backward Citations)
US4287229A
Cited
US4339524A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-26 | 1987-06-27 | 1987-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-26 | 1991-06-27 | 1991-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-26 | 1995-06-27 | 1995-12-27 | $7700.00 | Window Closed / Lapsed |