US3914641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron gun construction for multi-beam color cathode ray tube
Assignee: Individual
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Filing: 1973-06-13
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Granted: 1975-10-21
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Expires: 1993-06-13
Abstract
Abstract An electron gun construction for cathode ray tubes which produces plural beams from a single electron gun having a single cathode and having a control grid and a first anode each of which have at least three beam apertures arranged for example to produce three vertically spaced beams. Focus and accelerating anodes for the plural beams are also provided. In a preferred tri-color example, the phosphor screen is made up of successive vertical sets of color-producing phosphor zones arranged in three, substantially horizontal rows of red, blue and green producing phosphor spaced in vertical succession and scanned by the three beams.
Inventors
- 👤 Adrian W Standaart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:22
CPC Classifications
B; B82; B82Y; B82Y10/00; H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/30; H01J29/32; H01J29/325; H01J29/46; H01J29/48; H01J29/50; H01J29/503; H01J31/00; H01J31/08; H01J31/10; H01J31/20; H01J31/201; H01J31/50; H01J2229/00; H01J2229/48; H01J2229/50; H01J2229/507; H01J2231/00; H01J2231/12; H01J2231/121
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
326 words
An electron gun for producing at least one electron beam to excite phosphors in a phosphor screen area of a cathode ray tube to produce visible light, the electron gun forming an elongated assembly extending along a longitudinal axis and including a single cathode comprising a pair of joined metallic sheet members, each having an outwardly projecting truncated V-shaped channel formation projecting outwardly from a common plane between the sheet members collectively defining an elongated sixsided channel of substantially honeycomb cross-sectional configuration providing a flat emission panel spanning the cathode transversely of said longitudinal axis along a longitudinal panel axis, the channel housing filament wire along the length thereof, a coating of electron emission material on said emission panel which is thermally activated to emit electrons for forming the electron beam, control grid and first anode elements in spaced planes paralleling the plane of said emission panel and each having a hole for the electron beam for controlling and shaping the electrons emitted by the cathode into the beam, the holes in said grid and first anode elements for the electron beam being axially alined along a beam axis extending substantially perpendicular to said emission panel electrically conductive material about said holes, means defining electrically conductive paths for applying selected electrical potentials to said conductive material for the holes, the control grid being formed of a nonconductive substrate panel having said hole for the electron beam extending therethrough and having a rearwardly facing recess in the center region of the substrate to receive the cathode channel formation in partially nested relation therein, the hole in said control grid for said beam being positioned so that it opens into said recess, accelerating anode means for accelerating the electrons in said beam toward said phosphor screen area, a plurality of elongated supporting members, and connecting elements extending from the supporting members for rigidly supporting the cathode and control grid and first anode elements and accelerating anode means therefrom.
Claim 2
Dependent Claim
326 words
An electron gun for producing at least one electron beam to excite phosphors in a phosphor screen area of a cathode ray tube to produce visible light, the electron gun forming an elongated assembly extending along a longitudinal axis and including a single cathode comprising a pair of joined metallic sheet members, each having an outwardly projecting truncated V-shaped channel formation projecting outwardly from a common plane between the sheet members collectively defining an elongated sixsided channel of substantially honeycomb cross-sectional configuration providing a flat emission panel spanning the cathode transversely of said longitudinal axis along a longitudinal panel axis, the channel housing filament wire along the length thereof, a coating of electron emission material on said emission panel which is thermally activated to emit electrons for forming the electron beam, control grid and first anode elements in spaced planes paralleling the plane of said emission panel and each having a hole for the electron beam for controlling and shaping the electrons emitted by the cathode into the beam, the holes in said grid and first anode elements for the electron beam being axially alined along a beam axis extending substantially perpendicular to said emission panel electrically conductive material about said holes, means defining electrically conductive paths for applying selected electrical potentials to said conductive material for the holes, the control grid being formed of a nonconductive substrate panel having said hole for the electron beam extending therethrough and having a rearwardly facing recess in the center region of the substrate to receive the cathode channel formation in partially nested relation therein, the hole in said control grid for said beam being positioned so that it opens into said recess, accelerating anode means for accelerating the electrons in said beam toward said phosphor screen area, a plurality of elongated supporting members, and connecting elements extending from the supporting members for rigidly supporting the cathode and control grid and first anode elements and accelerating anode means therefrom.
Claim 3
Dependent Claim
86 words
An electron gun for a multi-beam cathode ray tube, as defined in claim 1, wherein said control grid and first anode elements each have three vertically alined holes spaced along a vertical plane providing a hole in each said element for each of three electron beams for respectively activating three different zones of different color-producing phosphors of a phosphor screen, and said longitudinal panel axis being arranged in a vertical plane passing through all of the three holes of said control grid and first anode elements.
Claim 4
Dependent Claim
60 words
An electron gun for a cathode ray tube, as defined in claim 2, wherein said flat emission panel has a width in a direction perpendicular to said vertical plane of about 3 mm, the holes in said control grid have a diameter of about 3/4 mm, and the holes in said first anode have a diameter of about 1 mm.
Claim 5
Dependent Claim
39 words
An electron gun as defined in claim 1, including a pair of filament winding coils in said channel formation rearwardly of said emission panel having their coilS intermeshed to intensify heating adjacent the central axis of the emission panel.
Claim 6
Dependent Claim
49 words
An electron gun as defined in claim 2, wherein said filament wire includes a pair of filament winding coils in said channel formation rearwardly of said emission panel having their coils intermeshed to intensify heating adjacent the central axis of the emission panel and wound in relatively opposite directions.
Claim 7
Dependent Claim
44 words
In an electron gun as defined in claim 1, said control grid having electrically conductive material lining said hole and connected by a photoetched conductor path to an edge terminal for applying selected potentials to the lining material for control of the electron beam.
Claim 8
Dependent Claim
71 words
In an electron gun as defined in claim 2, said rearwardly facing recess being of truncated V-shaped cross section in the center region of the substrate to receive the cathode channel formation in partially nested relation therein, and said control grid having electrically conductive material lining the holes and connected by conductor paths to edge terminals for applying selected potentials to the lining material for individual control of the electron beams.
Claim 9
Dependent Claim
72 words
In an electron gun as defined in claim 1, said rearwardly facing recess being of truncated V-shaped cross section in the center region of the substrate to receive the cathode channel formation in partially nested relation therein, and said control grid having electrically conductive material lining the holes and connected by photoetched conductor paths to edge terminals for applying selected potentials to the lining material for individual control of the electron beams.
Claim 10
Dependent Claim
63 words
An electron gun construction as defined in claim 1, wherein said recess in said control grid has a flat base wall confronting said emission panel of slightly smaller width than the emission panel to effect engagement of edges of the panel with side walls of the recess when the panel is spaced slightly rearwardly of the recess base wall to maintain such spacing.
Claim 11
Dependent Claim
63 words
An electron gun construction as defined in claim 7, where said recess in said control grid has a flat base wall confronting said emission panel of slightly smaller width than the emission panel to effect engagement of edges of the panel with side walls of the recess when the panel is spaced slightly rearwardly of the recess base wall to maintain such spacing.
Claim 12
Dependent Claim
56 words
An electron gun as defined in claim 7, wherein said control grid and first anode elements each include metallic lined apertures therethrough forming said holes and having a metallic shield extending from the substrate periphery as closed surround rearwardly from the control grid and forwardly from the first anode to minimize external interference and radiation effects.
Claim 13
Dependent Claim
57 words
An electron gun as defined in claim 1, wherein said control grid and first anode elements each include metallic lined apertures, therethrough forming said holes and having a metallic shield extending from the substrate periphery as a closed surround rearwardly from the control grid and forwardly from the first anode to minimize external interference and radiation effects.
Claim 14
Dependent Claim
57 words
An electron gun as defined in claim 7, wherein said control grid and first anode elements each include metallic lined apertures therethrough forming said holes and having a metallic shield extending from the substrate periphery as a closed surround rearwardly from the control grid and forwardly from the first anode to minimize external interference and radiation effects.
Claim 15
Dependent Claim
62 words
An electron gun as defined in claim 2, wherein said recess in said control grid has a flat base wall confronting said emission panel of slightly smaller width than the emission panel to effect engagement of edges of the panel with side walls of the recess when the panel is spaced slightly rearwardly of the recess base wall to maintain such spacing.
Claim 16
Dependent Claim
56 words
An electron gun as defined in claim 1, wherein said control grid and first anode elements each include metallic lined apertures forming saiD holes and having a metallic shield extending from the substrate periphery as a closed surround rearwardly from the control grid and forwardly from the first anode to minimize external interference and radiation effects.
Claim 17
Dependent Claim
56 words
An electron gun as defined in claim 2, wherein said control grid and first anode elements each include metallic lined apertures forming said holes and having a metallic shield extending from the substrate periphery as a closed surround rearwardly from the control grid and forwardly from the first anode to minimize external interference and radiation effects.
References Cited (Backward Citations)
US3771002A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |