US3560779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shadow mask type color picture tube with a fine mesh flexible particle shield between the gun and target portions
Assignee: RCA Licensing Corp
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Filing: 1968-05-02
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Granted: 1971-02-02
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Expires: 1988-05-02
Abstract
Abstract A shadow-mask-type color picture tube, comprising a glass envelope including neck, funnel and target portions, a triplebeam electron gun structure mounted in the neck portion, a mosaic three-color phosphor screen on the inner wall of the target portion, and a multiapertured shadow mask mounted adjacent to the screen, is provided with a fine mesh flexible annular particle shield, e.g. of stainless steel mesh, attached to the gun and extending into continuous contact with the wall of the neck portion.
Inventors
- 👤 Homer L May
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:58
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/10; H01J31/20; H01J31/201; H01J31/203; H01J31/205
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
223 words
A shadow-mask-type color picture tube comprising: a. an evacuated envelope including a cylindrical neck portion, a funnel portion, and a faceplate panel portion; b. a mosaic color phosphor screen on said panel portion; c. a multiapertured shadow-mask electrode mounted in said envelope adjacent to said screen; d. an electron gun structure mounted in said neck portion for projecting three electron beams towards said mask electrode and screen, said gun structure including: 1. a cylindrical cup-shaped convergence member having a plurality of small apertures in the base of the cup for the passage of said beams, the outer periphery of said convergence member being spaced from the inner wall of said neck portion by an annular gap; and 2. three series of aligned cathode, modulating, accelerating and focusing electrodes, each series terminating in a tubular focusing electrode located adjacent and attached to the base of said cup-shaped convergence member; and e. a nonmagnetic, flexible, fine mesh, annular shield of stainless steel, having at least 150 X 150 wires/inch and a thickness of 1 to 5 mils, extending between and continuously contacting said convergence member and the inner wall of said neck portion, for preventing particles from passing through said annular gap toward said shadow mask electrode, the inner periphery of said annular shield being clamped between said base and portions of said tubular electrodes.
Claim 2
Dependent Claim
223 words
A shadow-mask-type color picture tube comprising: a. an evacuated envelope including a cylindrical neck portion, a funnel portion, and a faceplate panel portion; b. a mosaic color phosphor screen on said panel portion; c. a multiapertured shadow-mask electrode mounted in said envelope adjacent to said screen; d. an electron gun structure mounted in said neck portion for projecting three electron beams towards said mask electrode and screen, said gun structure including: 1. a cylindrical cup-shaped convergence member having a plurality of small apertures in the base of the cup for the passage of said beams, the outer periphery of said convergence member being spaced from the inner wall of said neck portion by an annular gap; and 2. three series of aligned cathode, modulating, accelerating and focusing electrodes, each series terminating in a tubular focusing electrode located adjacent and attached to the base of said cup-shaped convergence member; and e. a nonmagnetic, flexible, fine mesh, annular shield of stainless steel, having at least 150 X 150 wires/inch and a thickness of 1 to 5 mils, extending between and continuously contacting said convergence member and the inner wall of said neck portion, for preventing particles from passing through said annular gap toward said shadow mask electrode, the inner periphery of said annular shield being clamped between said base and portions of said tubular electrodes.
Claim 3
Dependent Claim
105 words
three series of aligned cathode, modulating, accelerating and focusing electrodes, each series terminating in a tubular focusing electrode located adjacent and attached to the base of said cup-shaped convergence member; and e. a nonmagnetic, flexible, fine mesh, annular shield of stainless steel, having at least 150 X 150 wires/inch and a thickness of 1 to 5 mils, extending between and continuously contacting said convergence member and the inner wall of said neck portion, for preventing particles from passing through said annular gap toward said shadow mask electrode, the inner periphery of said annular shield being clamped between said base and portions of said tubular electrodes.
Claim 4
Dependent Claim
105 words
three series of aligned cathode, modulating, accelerating and focusing electrodes, each series terminating in a tubular focusing electrode located adjacent and attached to the base of said cup-shaped convergence member; and e. a nonmagnetic, flexible, fine mesh, annular shield of stainless steel, having at least 150 X 150 wires/inch and a thickness of 1 to 5 mils, extending between and continuously contacting said convergence member and the inner wall of said neck portion, for preventing particles from passing through said annular gap toward said shadow mask electrode, the inner periphery of said annular shield being clamped between said base and portions of said tubular electrodes.
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |