US5315207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for generating electrons, and display device
Assignee: US Philips Corp
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Filing: 1990-04-04
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Granted: 1994-05-24
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Expires: 2010-04-04
Abstract
Abstract A planar electron-optical lens is obtained on a semiconductor cathode surface by providing an extra electrode (16) around the gate electrode (14). Dependent on the applied voltage, this configuration operates, for example, as a positive lens which supplies parallel beams without dispersion, suitable for thin, flat display devices. A large positioning tolerance is obtained due to the inherent magnification of the beam diameter in the semiconductor device, while a grid can be dispensed with.
Inventors
- 👤 Arthur M. E. Hoeberechts
- 👤 Nicolaas Lambert
- 👤 Gerardus G. P. van Gorkom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:15
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/30; H01J1/308; H01J29/00; H01J29/46; H01J29/48; H01J29/485; H01J3/00; H01J3/02; H01J3/027
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
79 words
A device for producing an electron beam comprising a substrate supporting an insulating layer having an aperture, emission means for emitting electrons through the aperture, and beam forming means for producing an electron lens for forming the emitted electrons into said electron beam, characterized in that said beam forming means comprises: a. a first planar electrode substantially surrounding the aperture where the emitted electrons exit said aperture; and b. a second planar electrode substantially surrounding the first planar electrode.
Claim 2
Independent Claim
79 words
A device for producing an electron beam comprising a substrate supporting an insulating layer having an aperture, emission means for emitting electrons through the aperture, and beam forming means for producing an electron lens for forming the emitted electrons into said electron beam, characterized in that said beam forming means comprises: a. a first planar electrode substantially surrounding the aperture where the emitted electrons exit said aperture; and b. a second planar electrode substantially surrounding the first planar electrode.
Claim 3
Dependent Claim
31 words
A device as in claim 1 where the substrate comprises a semiconductor body and where the emission means comprises a semiconductor cathode disposed in said body in alignment with the aperture.
Claim 4
Dependent Claim
37 words
A device as in claim 2 where the insulating layer is directly supported on the substrate and where the semiconductor cathode comprises a pn junction proximate said surface and adapted for emitting said electrons by avalanche multiplication.
Claim 5
Dependent Claim
18 words
A device as in claim 2 or 3 where the semiconductor body comprises silicon or an A3-B5 compound.
Claim 6
Dependent Claim
23 words
A device as in claim 1 where the emission means comprises a field emitter which is at least partially disposed within the aperture.
Claim 7
Dependent Claim
17 words
A device as in claim 1, 2 or 5 where the aperture has a substantially circular shape.
Claim 8
Dependent Claim
17 words
A device as in claim 1, 2 or 5 where the aperture has a substantially linear shape.
Claim 9
Dependent Claim
21 words
A device as in claim 1, 2 or 5 where at least one of the electrodes comprises a plurality of subelectrodes.
Claim 10
Dependent Claim
19 words
A device as in claim 1, 2 or 5 where the insulating layer is disposed directly on the substrate.
Claim 11
Dependent Claim
25 words
A device as in claim 1, 2 or 5 where at least one of the electrodes comprise a layer disposed directly on the insulating layer.
Claim 12
Dependent Claim
15 words
A device as in claim 1, 2 or 5 where the electrodes are substantially coplanar.
Claim 13
Dependent Claim
109 words
A cathode ray display tube comprising a luminescent screen, a plurality of devices for producing respective electron beams, and means for deflecting the electron beams to a direction substantially parallel to the screen, each of said devices including a substrate supporting an insulating layer having an aperture, emission means for emitting electrons through the aperture, and beam forming means for producing an electron lens for forming the emitted electrons into said electron beam, characterized in that said beam forming means comprises: a. a first planar electrode substantially surrounding the aperture where the emitted electrons exit said aperture; and b. a second planar electrode substantially surrounding the first planar electrode.
Claim 14
Dependent Claim
109 words
A cathode ray display tube comprising a luminescent screen, a plurality of devices for producing respective electron beams, and means for deflecting the electron beams to a direction substantially parallel to the screen, each of said devices including a substrate supporting an insulating layer having an aperture, emission means for emitting electrons through the aperture, and beam forming means for producing an electron lens for forming the emitted electrons into said electron beam, characterized in that said beam forming means comprises: a. a first planar electrode substantially surrounding the aperture where the emitted electrons exit said aperture; and b. a second planar electrode substantially surrounding the first planar electrode.
Claim 15
Dependent Claim
24 words
A display tube as in claim 11 where said devices are arranged for directing said beams substantially perpendicular to the direction of the screen.
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) | 1997-05-23 | 1997-11-22 | 1998-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-23 | 2001-11-22 | 2002-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-23 | 2005-11-22 | 2006-05-24 | $7700.00 | Window Closed / Lapsed |