US4469766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming cathode-ray tube phosphor screen
Assignee: Hitachi Ltd
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Filing: 1982-11-18
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Granted: 1984-09-04
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Expires: 2002-11-18
Abstract
Abstract For formation of a cathode-ray tube phosphor screen by causing a fluorescent material to adhere to a particle-accepting sticky surface formed uniformly on the inner surface of a face plate, phosphor particles are placed on the inner surface of the face plate and caused to slide physically over the particle-accepting sticky surface so as to be stuck thereto.
Inventors
- 👤 Masahiro Nishizawa
- 👤 Kiyoshi Miura
- 👤 Hiroshi Yokomizo
- 👤 Osamu Sasaya
- 👤 Yoshifumi Tomita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:36
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/227; G; G03; G03F; G03F7/00; G03F7/26; G03F7/28; H01J9/2271
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
159 words
A method of forming a cathode-ray tube phosphor screen by causing a fluorescent material to adhere to a particle-accepting photo-sticky surface formed uniformly on the inner surface of a face plate comprising the steps of: applying a photosensitive composition which becomes sticky through exposure to ultraviolet light, to an inside surface of a faceplate of the color picture tube as a thin layer; exposing the thin layer to ultraviolet light patternwise through a shadow mask, thereby making the exposed parts sticky; placing phosphor particles on the inner surface of the face plate; and tilting said face plate simultaneously in orthogonal directions alternately to cause the phosphor particles to slide in a zig-zag fashion from one corner of said faceplate to the diagonally opposite corner and back to said one corner, thereby causing the phosphor particles to slide physically over the particle-capturing sticky surface so as to cause the phosphor particles to be stuck patternwise to the particle-retaining sticky surface.
Claim 2
Independent Claim
159 words
A method of forming a cathode-ray tube phosphor screen by causing a fluorescent material to adhere to a particle-accepting photo-sticky surface formed uniformly on the inner surface of a face plate comprising the steps of: applying a photosensitive composition which becomes sticky through exposure to ultraviolet light, to an inside surface of a faceplate of the color picture tube as a thin layer; exposing the thin layer to ultraviolet light patternwise through a shadow mask, thereby making the exposed parts sticky; placing phosphor particles on the inner surface of the face plate; and tilting said face plate simultaneously in orthogonal directions alternately to cause the phosphor particles to slide in a zig-zag fashion from one corner of said faceplate to the diagonally opposite corner and back to said one corner, thereby causing the phosphor particles to slide physically over the particle-capturing sticky surface so as to cause the phosphor particles to be stuck patternwise to the particle-retaining sticky surface.
Claim 3
Dependent Claim
42 words
A method of forming a cathode-ray tube phosphor screen according to claim 1 wherein a predetermined amount of phosphor particles is placed in one corner on the inner surface of said face plate, and tilt angles in the orthogonal directions are different.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-04 | 1988-03-05 | 1988-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-04 | 1992-03-05 | 1992-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-04 | 1996-03-05 | 1996-09-04 | $7700.00 | Window Closed / Lapsed |