Patent US4280077A successfully refreshed from Google Patents.
US4280077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode-ray tube having corrugated shadow mask with varying waveform
Assignee: RCA Licensing Corp
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Filing: 1978-05-11
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Granted: 1981-07-21
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Expires: 1998-05-11
Abstract
Abstract A shadow mask type of cathode-ray tube is improved by including a corrugated mask having a cross-section of varying waveform. In one embodiment, the amplitude of the corrugations is gradually decreased in the center-to-edge directions whereas in another emdodiment the peak-to-peak wavelength between corrugations is increased in the center-to-edge directions. The amplitude and wavelength variations can also be combined in mask construction to obtain the advantages of each.
Inventors
- 👤 Sigmund T. Villanyi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:29
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/06; H01J29/07
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
95 words
In an apertured shadow mask type cathode-ray tube, comprising an evacuated envelope including a faceplate, a phosphor viewing screen located on an inner surface of said faceplate, a multiapertured shadow mask mounted adjacent to said screen, and means for generating and projecting electrons along a plurality of convergent paths through said mask and to said screen, the improvement comprising, a shadow mask including a corrugated cross-section having a varying waveform wherein the cross-sectional contour of said mask at the edge of said mask is different than the cross-sectional contour at the center of said mask.
Claim 2
Dependent Claim
95 words
In an apertured shadow mask type cathode-ray tube, comprising an evacuated envelope including a faceplate, a phosphor viewing screen located on an inner surface of said faceplate, a multiapertured shadow mask mounted adjacent to said screen, and means for generating and projecting electrons along a plurality of convergent paths through said mask and to said screen, the improvement comprising, a shadow mask including a corrugated cross-section having a varying waveform wherein the cross-sectional contour of said mask at the edge of said mask is different than the cross-sectional contour at the center of said mask.
Claim 3
Dependent Claim
16 words
The tube as defined in claim 1 wherein the amplitude of corrugations varies across the mask.
Claim 4
Dependent Claim
16 words
The tube as defined in claim 1 wherein the wavelength of corrugations varies across the mask.
Claim 5
Dependent Claim
19 words
The tube as defined in claim 1 wherein both the amplitude and wavelength of corrugations vary across the mask.
Claim 6
Dependent Claim
83 words
In an apertured shadow mask type cathode-ray tube comprising an evacuated envelope including a substantially flat faceplate, a phosphor viewing screen located on an inner surface of said faceplate, a multiapertured shadow mask mounted adjacent to said screen, and means for generating and projecting electrons along a plurality of convergent paths through said mask and to said screen, the improvement comprising a shadow mask having a corrugated cross-sectional contour wherein the amplitude of corrugations varies from the center to edge of the mask.
Claim 7
Dependent Claim
83 words
In an apertured shadow mask type cathode-ray tube comprising an evacuated envelope including a substantially flat faceplate, a phosphor viewing screen located on an inner surface of said faceplate, a multiapertured shadow mask mounted adjacent to said screen, and means for generating and projecting electrons along a plurality of convergent paths through said mask and to said screen, the improvement comprising a shadow mask having a corrugated cross-sectional contour wherein the amplitude of corrugations varies from the center to edge of the mask.
Claim 8
Dependent Claim
22 words
The tube as defined in claim 5, wherein the amplitude of corrugations decreases from the center to the edge of the mask.
Claim 9
Dependent Claim
84 words
In an apertured shadow mask type cathode-ray tube comprising an evacuated envelope including a substantially flat faceplate, a phosphor viewing screen located on an inner surface of said faceplate, a multiapertured shadow mask mounted adjacent to said screen, and means for generating and projecting electrons along a plurality of convergent paths through said mask and to said screen, the improvement comprising a shadow mask having a corrugated cross-sectional contour wherein the wavelength of corrugations varies from the center to the edge of the mask.
Claim 10
Dependent Claim
84 words
In an apertured shadow mask type cathode-ray tube comprising an evacuated envelope including a substantially flat faceplate, a phosphor viewing screen located on an inner surface of said faceplate, a multiapertured shadow mask mounted adjacent to said screen, and means for generating and projecting electrons along a plurality of convergent paths through said mask and to said screen, the improvement comprising a shadow mask having a corrugated cross-sectional contour wherein the wavelength of corrugations varies from the center to the edge of the mask.
Claim 11
Dependent Claim
22 words
The tube as defined in claim 7 wherein the wavelength of corrugations increases from the center to the edge of the mask.
Claim 12
Dependent Claim
88 words
In an apertured shadow mask type cathode-ray tube, comprising an evacuated envelope including a substantially flat faceplate, a phosphor viewing screen located on an inner surface of said faceplate, a multiapertured shadow mask mounted adjacent to said screen and means for generating and projecting electrons along a plurality of convergent paths through said mask and to said screen, the improvement comprising a shadow mask having a corrugated cross-sectional contour wherein both the amplitude and the wavelength of corrugations vary from the center to the edge of the mask.
Claim 13
Dependent Claim
88 words
In an apertured shadow mask type cathode-ray tube, comprising an evacuated envelope including a substantially flat faceplate, a phosphor viewing screen located on an inner surface of said faceplate, a multiapertured shadow mask mounted adjacent to said screen and means for generating and projecting electrons along a plurality of convergent paths through said mask and to said screen, the improvement comprising a shadow mask having a corrugated cross-sectional contour wherein both the amplitude and the wavelength of corrugations vary from the center to the edge of the 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) | 1984-07-20 | 1985-01-19 | 1985-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-20 | 1989-01-19 | 1989-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-20 | 1993-01-19 | 1993-07-21 | $7700.00 | Window Closed / Lapsed |