US3921022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Field emitting device and method of making same
Assignee: RCA Licensing Corp
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Filing: 1974-09-03
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Granted: 1975-11-18
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Expires: 1994-09-03
Abstract
Abstract A non-thermionic field emitting device includes at least one pyramidal shaped field emitting element on one surface of an electrically conductive substrate. At least one needle-like projection is located on the tip of the pyramidal shaped field emitting element. An electron extracting electrode is mounted in parallel spaced relation to and is electrically insulated from the surface of the substrate having the field emitting element thereon. The electron extracting electrode has at least one aperture therein, the aperture being positioned substantially coaxially with a corresponding pyramidal shaped field emitting element.
Inventors
- 👤 Jules David Levine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:01
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/52; H01J1/00; H01J1/02; H01J1/30; H01J1/304; H01J1/3042; H01J3/00; H01J3/02; H01J3/021; H01J3/022; H01J63/00; H01J9/00; H01J9/02; H01J9/022; H01J9/025; H01J2893/00; H01J2893/0031
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
74 words
A non-thermionic field emitting device comprising: a. an electrically conductive substrate having opposed surfaces; b. at least one field emitting element on said one surface of said substrate, said field emitting element having a pointed tip which projects away from said substrate; and c. at least one needle-like projection disposed only on said pointed tip of said field emitting element whereby electron emission is enhanced by convergent lines of force of an electric field.
Claim 2
Dependent Claim
74 words
A non-thermionic field emitting device comprising: a. an electrically conductive substrate having opposed surfaces; b. at least one field emitting element on said one surface of said substrate, said field emitting element having a pointed tip which projects away from said substrate; and c. at least one needle-like projection disposed only on said pointed tip of said field emitting element whereby electron emission is enhanced by convergent lines of force of an electric field.
Claim 3
Dependent Claim
21 words
A non-thermionic field emitting device in accordance with claim 1 in which said field emitting element has a substantially pyramidal shape.
Claim 4
Dependent Claim
56 words
A non-thermionic field emitting device in accordance with claim 2 having an electron extracting electrode insulatingly spaced from and substantially parallel to said one surface of said substrate, said electron extracting electrode comprising a layer of electrically conductive material having at least one aperture therein which is positioned substantially coaxially with a corresponding field emitting element.
Claim 5
Dependent Claim
28 words
A non-thermionic field emitting device in accordance with claim 3 having a plurality of field emitting elements in a matrix array on said one surface of said substrate.
Claim 6
Independent Claim
147 words
A device for modulating the flow of electrons comprising the following in a vacuum tight relationship: a. an electron source comprising at least one field emitting element having a pointed tip with at least one needle-like projection disposed only on said pointed tip; b. an electron target; c. a modulating element positioned beetween said electron source and electron target to control the quantity of electrons impinging upon said electron target, said modulating element having a known capacitance with respect to said electron source; d. means whereby said known capacitance can be charged to a predetermined voltage level; e. an electrode for extracting electrons from said field emitting element, said electrode in insulatingly spaced-relation between said field emitting element and said modulating element and structured such that the electron extracting electrode will not impede the passage of the electrons from said field emitting element to said modulating element.
Claim 7
Independent Claim
147 words
A device for modulating the flow of electrons comprising the following in a vacuum tight relationship: a. an electron source comprising at least one field emitting element having a pointed tip with at least one needle-like projection disposed only on said pointed tip; b. an electron target; c. a modulating element positioned beetween said electron source and electron target to control the quantity of electrons impinging upon said electron target, said modulating element having a known capacitance with respect to said electron source; d. means whereby said known capacitance can be charged to a predetermined voltage level; e. an electrode for extracting electrons from said field emitting element, said electrode in insulatingly spaced-relation between said field emitting element and said modulating element and structured such that the electron extracting electrode will not impede the passage of the electrons from said field emitting element to said modulating element.
Claim 8
Dependent Claim
36 words
A device in accordance with claim 5 in which said electron extracting electrode comprises a layer of electrically conductive material having at least one aperture therein in coaxially spaced relation with a corresponding field emitting element.
Claim 9
Dependent Claim
49 words
A device in accordance with claim 6 in which the modulating element is a screen electrode parallel to and insulatingly spaced from said electron extracting electrode, said screen electrode comprising a sheet of an electrically conductive material having a mesh-like structure formed by a multiplicity of finely spaced apertures.
Claim 10
Dependent Claim
18 words
A device in accordance with claim 7 in which the electron target comprises a phosphor coated display screen.
Claim 11
Dependent Claim
104 words
A display device comprising the following in a vacuum tight relationship: a. a plurality of field emItting electron sources, each field emitting electron source having a pointed tip and at least one needle-like projection disposed only on said pointed tip; b. an electron target; c. a modulating element disposed between each of said electron sources and said electron target to control uniformity of the quantity of electrons impinging upon said electron target from each source, each modulating element having a known capacitance with respect to its associated electron source; and d. means whereby each known capacitance can be charged to a predetermined voltage level.
Claim 12
Dependent Claim
104 words
A display device comprising the following in a vacuum tight relationship: a. a plurality of field emItting electron sources, each field emitting electron source having a pointed tip and at least one needle-like projection disposed only on said pointed tip; b. an electron target; c. a modulating element disposed between each of said electron sources and said electron target to control uniformity of the quantity of electrons impinging upon said electron target from each source, each modulating element having a known capacitance with respect to its associated electron source; and d. means whereby each known capacitance can be charged to a predetermined voltage level.
Claim 13
Dependent Claim
113 words
A display device in accordance with claim 9 in which said plurality of electron sources comprises a matrix array of electron emitting sites, each site comprising: a. a field emitting element disposed on an electrically conductive substrate, said field emitting element having a pointed tip which projects away from said substrate and at least one needle-like projection disposed only on said tip; and b. an electrode for extracting electrons from said field emitting element, said electrode comprising a layer of an electrically conductive material disposed in insulatingly spaced relation between said field emitting element and said modulating element, said layer having an aperture therein in coaxially spaced relation with said field emitting element.
Claim 14
Dependent Claim
51 words
A display device in accordance with claim 10 in which said modulating element is a screen electrode disposed parallel to and insulatingly spaced from said electron extracting electrode, said screen electrode comprising a layer of an electrically conductive material having a mesh-like structure formed by a multiplcity of finely spaced apertures.
Claim 15
Dependent Claim
19 words
A display device in accordance with claim 11 in which the electron target comprises a phosphor coated display screen.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |