US3771003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shielded cathode ray tube electron gun
Assignee: GTE Sylvania Inc
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Filing: 1972-05-25
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Granted: 1973-11-06
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Expires: 1992-05-25
Abstract
Abstract An improved electron gun structure is provided for use in a cathode ray tube wherein insulative shielding is arranged to substantially encompass at least a portion of the plural electrode arrangement of the gun assembly. Such shielding, being dimensioned to be spaced from the interior surface of the envelope neck portion, is suitably positioned and retained relative to the support rods of the gun structure in a manner that the shielded gun assembly is inserted as a unit into the envelope neck portion during tube fabrication.
Inventors
- 👤 J Kerr
- 👤 J Reardon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:53
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/48; H01J29/50
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
232 words
An improved electron gun structure for use in a color cathode ray tube having an envelope formed of a neck portion, a funnel portion and a face panel portion whereupon a cathodoluminescent screen is disposed, said electron gun structure being constructed for subsequent orientation within the neck portion of said envelope and comprising: a plurality of longitudinal arrangements of associated electrodes related in a manner to subsequently provide for generating, forming and focusing a plurality of beams of electrons toward said cathodoluminescent screen; a plurality of glass support rods spatially oriented peripheral to said electrode arrangements to provide support and affixed positioning for said related electrodes in said gun structure; a common magnetic convergence assembly contiguous to and extending forward of the terminal electrodes of said gun structure, and having resilient means peripherally associated therewith to effect the subsequent centering of said electron gun structure in the neck portion of said envelope; and insulative glass shielding means arranged in a substantially encompassing manner about said supported electrode arrangements, said shielding being dimensioned to be spaced from the interior surface of said envelope neck portion when said gun is inserted therein to provide shielding for said electrodes, said glass shielding means being positioned and retained in contiguous bonded relationship to at least one of said support rods in said gun structure, said shielding being oriented immediately to the rear of said convergence assembly.
Claim 2
Dependent Claim
232 words
An improved electron gun structure for use in a color cathode ray tube having an envelope formed of a neck portion, a funnel portion and a face panel portion whereupon a cathodoluminescent screen is disposed, said electron gun structure being constructed for subsequent orientation within the neck portion of said envelope and comprising: a plurality of longitudinal arrangements of associated electrodes related in a manner to subsequently provide for generating, forming and focusing a plurality of beams of electrons toward said cathodoluminescent screen; a plurality of glass support rods spatially oriented peripheral to said electrode arrangements to provide support and affixed positioning for said related electrodes in said gun structure; a common magnetic convergence assembly contiguous to and extending forward of the terminal electrodes of said gun structure, and having resilient means peripherally associated therewith to effect the subsequent centering of said electron gun structure in the neck portion of said envelope; and insulative glass shielding means arranged in a substantially encompassing manner about said supported electrode arrangements, said shielding being dimensioned to be spaced from the interior surface of said envelope neck portion when said gun is inserted therein to provide shielding for said electrodes, said glass shielding means being positioned and retained in contiguous bonded relationship to at least one of said support rods in said gun structure, said shielding being oriented immediately to the rear of said convergence assembly.
Claim 3
Dependent Claim
36 words
An electron gun structure according to claim 1 wherein said insulative shielding means is fitted longitudinally over the glass support rods and positioned by plural pin attachment means associated with at least one of said rods.
Claim 4
Dependent Claim
86 words
An electron gun structure for use in a color cathode ray tube according to claim 1 wherein said insulative shielding means are in the form of a plurality of curved glass leaves whereof each has two opposed substantially arcuate end oriented edges and two opposed substantially straight side oriented edges, said side edges being adjacently positioned in a lateral relationship to collectively form a peripheral encompassment of the plural beam electron gun structure, each of said leaves being attached to an individual of said support rods.
Claim 5
Dependent Claim
47 words
An electron gun structure for a color cathode ray tube according to claim 1 wherein the composition of said insulative shielding glass contains an x-radiation absorptive material in the form of at least one metallic compound selected from the group consisting essentially of lead, barium and strontium.
Claim 6
Dependent Claim
175 words
A plural beam color cathode ray tube comprising: an envelope having face panel, funnel and neck portions; a patterned cathodoluminescent screen disposed on the interior surface of said face panel; a plural beam electron gun structure located within said envelope neck portion in a manner to project a plurality of electron beams toward said patterned screen, said gun structure being formed of a plurality of sequential arrangements of associated electrodes positionally related by several spatially oriented longitudinal glass support rods; a common magnetic convergence assembly contiguous to and extended forward of the terminal electrodes of said gun structure and having resilient means peripherally associated therewith to center said electron gun structure in the neck portion of said envelope; and insulative glass shielding means arranged in a substantially encompassing manner about said electron gun structure and spaced from the interior surface of said envelope neck portion to provide shielding for said electrodes, said shielding means being positioned and retained in bonded attachment to said gun structure support rods immediately to the rear of said convergence assembly.
Claim 7
Dependent Claim
175 words
A plural beam color cathode ray tube comprising: an envelope having face panel, funnel and neck portions; a patterned cathodoluminescent screen disposed on the interior surface of said face panel; a plural beam electron gun structure located within said envelope neck portion in a manner to project a plurality of electron beams toward said patterned screen, said gun structure being formed of a plurality of sequential arrangements of associated electrodes positionally related by several spatially oriented longitudinal glass support rods; a common magnetic convergence assembly contiguous to and extended forward of the terminal electrodes of said gun structure and having resilient means peripherally associated therewith to center said electron gun structure in the neck portion of said envelope; and insulative glass shielding means arranged in a substantially encompassing manner about said electron gun structure and spaced from the interior surface of said envelope neck portion to provide shielding for said electrodes, said shielding means being positioned and retained in bonded attachment to said gun structure support rods immediately to the rear of said convergence assembly.
Claim 8
Dependent Claim
68 words
A color cathode ray tube according to claim 5 wherein said electron gun shielding means is in the form of a sleeve fitted longitudinally over the glass support rods of said electron gun structure in a contiguous manner and positioned thereon by plural pin attachment means associated with at least one of said rods, said glass sleeve material having a softening point in excess of substantially 500* centigrade.
Claim 9
Dependent Claim
93 words
A color cathode ray tube according to claim 5 wherein said electron gun insulative shielding means are in the form of a plurality of curved glass leaves whereof each has two opposed substantially arcuate end-oriented edges and two opposed substantially straight side-oriented edges, said side edges being adjacently positioned in a lateral relationship to collectively form a peripheral encompassment of said electron gun structure, each of said leaves being attached to an individual of said support rods, the material of said glass leaves having a softening point in excess of substantially 500* centigrade.
Claim 10
Dependent Claim
44 words
A color cathode ray tube according to claim 5 wherein the composition of said electron gun insulative shielding glass contains an x-radiation absorptive material in the form of at least one metallic compound selected from the group consisting essentially of lead, barium and strontium.
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |