Patent US4449069A successfully refreshed from Google Patents.
US4449069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color picture tube with focusing electrode having electrostatic field distortion aperture therein
Assignee: RCA Licensing Corp
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Filing: 1982-02-10
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Granted: 1984-05-15
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Expires: 2002-02-10
Abstract
Abstract An inline electron gun in a color picture tube is improved by the addition of two slot apertures that are spaced sufficiently close to and outward from the two outer apertures in a portion of a focusing electrode facing a screen grid electrode to cause a distortion of the electrostatic field formed between the two electrodes at the two outer apertures. The electrostatic field distortion causes two outer electron beams to converge toward a center electron beam.
Inventors
- 👤 Naim Z. Assil
- 👤 Richard H. Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:04
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/48; H01J29/50; H01J29/503; H01J29/51
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
93 words
In a color picture tube having an inline electron gun including at least a focusing electrode and a screen grid electrode, said electrodes including a plurality of inline apertures in portions facing each other, the improvement comprising the portion of said focusing electrode facing said screen grid electrode including an additional aperture which is spaced sufficiently close to and outward from an offaxis aperture of the plurality of inline apertures therein to cause a distortion of an electrostatic field formed between said focusing electrode and said screen grid electrode at the offaxis aperture.
Claim 2
Dependent Claim
93 words
In a color picture tube having an inline electron gun including at least a focusing electrode and a screen grid electrode, said electrodes including a plurality of inline apertures in portions facing each other, the improvement comprising the portion of said focusing electrode facing said screen grid electrode including an additional aperture which is spaced sufficiently close to and outward from an offaxis aperture of the plurality of inline apertures therein to cause a distortion of an electrostatic field formed between said focusing electrode and said screen grid electrode at the offaxis aperture.
Claim 3
Dependent Claim
28 words
The tube as defined in claim 1 wherein the spacing between the additional aperture and the offaxis aperture is in the range of 0.60 mm to 1.50 mm.
Claim 4
Dependent Claim
144 words
In a color picture tube having an inline electron gun for generating and directing three electron beams along coplanar paths toward a screen of said tube, said gun including at least four spaced electrodes including a control grid electrode, a screen grid electrode, a first focusing electrode and a second focusing electrode, three inline apertures in a portion of said first focusing electrode facing said screen grid electrode, the improvement comprising said first focusing electrode including two slot apertures in said portion facing said screen grid which are spaced sufficiently close to and outward from the two outer apertures in said portion to cause a distortion of an electrostatic field formed between said first focusing electrode and said screen grid electrode at said two outer apertures, whereby the outer two electron beams are converged toward the center electron beam by the electrostatic field distortion.
Claim 5
Dependent Claim
144 words
In a color picture tube having an inline electron gun for generating and directing three electron beams along coplanar paths toward a screen of said tube, said gun including at least four spaced electrodes including a control grid electrode, a screen grid electrode, a first focusing electrode and a second focusing electrode, three inline apertures in a portion of said first focusing electrode facing said screen grid electrode, the improvement comprising said first focusing electrode including two slot apertures in said portion facing said screen grid which are spaced sufficiently close to and outward from the two outer apertures in said portion to cause a distortion of an electrostatic field formed between said first focusing electrode and said screen grid electrode at said two outer apertures, whereby the outer two electron beams are converged toward the center electron beam by the electrostatic field distortion.
Claim 6
Dependent Claim
29 words
The tube as defined in claim 3 wherein the spacing between each slot aperture and each adjacent outer aperture is in the range of 0.60 mm to 1.50 mm.
References Cited (Backward Citations)
US3873879A
Cited
NL7809160A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-15 | 1987-11-14 | 1988-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-15 | 1991-11-14 | 1992-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-15 | 1995-11-14 | 1996-05-15 | $7700.00 | Window Closed / Lapsed |