US4687825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing phosphor screen of cathode ray tube
Assignee: Toshiba Corp
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Filing: 1985-09-16
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Granted: 1987-08-18
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Expires: 2005-09-16
Abstract
Abstract A method of manufacturing a phosphor screen of a cathode ray tube, comprises forming a pattern having a particle-receptive adhesive surface on an inner surface of a faceplate having a peripheral wall, rotating the faceplate about an axis perpendicular to its inner surface and passing its center, and charging phosphor particles onto the inner surface of the faceplate during or before rotation thereof so as to allow the phosphor particles to slide on the inner surface of the faceplate and to attach to the particle-receptive adhesive surface. The method can form a phosphor film having a uniform and sufficient thickness without an irregularity in the amount of phosphor attached.
Inventors
- 👤 Seiji Sagou
- 👤 Takeo Itou
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:16
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/227; H01J9/2271; H01J9/2277
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
116 words
A method of manufacturing a phosphor screen of a cathode ray tube, comprising: forming a pattern having a particle-receptive adhesive surface on an inner surface of a face plate having a peripheral wall; rotating said face plate at a rotational frequency of 1 to 100 rpm about an axis perpendicular to an inner surface thereof and passing a center thereof, the axis of the face plate being inclined with respect to a vertical axis; and charging phosphor particles onto the inner surface of said face plate during or before rotation thereof so as to allow the phosphor particles to slide on the inner surface of said face plate and to attach to said particle-receptive adhesive surface.
Claim 2
Independent Claim
116 words
A method of manufacturing a phosphor screen of a cathode ray tube, comprising: forming a pattern having a particle-receptive adhesive surface on an inner surface of a face plate having a peripheral wall; rotating said face plate at a rotational frequency of 1 to 100 rpm about an axis perpendicular to an inner surface thereof and passing a center thereof, the axis of the face plate being inclined with respect to a vertical axis; and charging phosphor particles onto the inner surface of said face plate during or before rotation thereof so as to allow the phosphor particles to slide on the inner surface of said face plate and to attach to said particle-receptive adhesive surface.
Claim 3
Dependent Claim
36 words
A method according to claim 1, wherein an angle formed between the axis of said faceplate and the vertical axis is selected so that the phosphor particles slide over the entire inner surface of said faceplate.
Claim 4
Dependent Claim
14 words
A method according to claim 2, wherein the angle is 5 to 85 degrees.
Claim 5
Dependent Claim
14 words
A method according to claim 3, wherein the angle is 20 to 70 degrees.
Claim 6
Dependent Claim
16 words
A method according to claim 2, wherein the angle is changed during rotation of said faceplate.
Claim 7
Dependent Claim
16 words
A method according to claim 5, wherein the angle is increased during rotation of said faceplate.
Claim 8
Dependent Claim
29 words
A method according to claim 1, wherein a rotational frequency of said faceplate is selected so that the phosphor particles slide over the entire inner surface of said faceplate.
Claim 9
Dependent Claim
18 words
A method according to claim 1, wherein the rotational frequency of said faceplate is 5 to 60 rpm.
Claim 10
Dependent Claim
20 words
A method according to claim 7, wherein the rotational frequency of said faceplate is changed during rotation of said faceplate.
Claim 11
Dependent Claim
17 words
A method according to claim 1, wherein the phosphor particles are charged during rotation of said faceplate.
Claim 12
Dependent Claim
32 words
A method according to claim 10, wherein the phosphor particles are charged while an axis of said faceplate is inclined with respect to a vertical axis and said faceplate is being rotated.
Claim 13
Dependent Claim
29 words
A method according to claim 1, wherein said faceplate is vibrated so as to facilitate the sliding movement of the phosphor particles on the inner surface of said faceplate.
Claim 14
Dependent Claim
35 words
A method according to claim 1, wherein said faceplate has a shielding plate which extends from the top of the peripheral wall toward a rotating axis thereof and prevents the scattering of the phosphor particles.
Claim 15
Dependent Claim
47 words
A method according to claim 1, wherein said pattern having said particle-receptive adhesive surface is obtained by coating a material capable of being imparted with a stickiness by light radiation on the inner surface of said faceplate and then exposing the coating film through a shadow mask.
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) | 1990-08-17 | 1991-02-16 | 1991-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-17 | 1995-02-16 | 1995-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-17 | 1999-02-16 | 1999-08-18 | $7700.00 | Window Closed / Lapsed |