Patent US3794878A successfully refreshed from Google Patents.
US3794878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron beam regulator
Assignee: Ford Motor Co
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Filing: 1972-12-11
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Granted: 1974-02-26
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Expires: 1992-12-11
Abstract
Abstract A resistor connected between the filament and a filament can of an electron beam device also is connected to an auxiliary operational amplifier that establishes and controls an auxiliary current through the resistor. The operational amplifier can be connected to maintain a constant current through the resistor or a constant potential difference across the resistor despite wide variations in the potential of the filament power supply, the electron producing ability of the filament, or other operational disturbances. In addition, the operational amplifier can be programmed to produce predetermined variations in the quantity of electrons making up the electron beam with a much wider band width.
Inventors
- 👤 E Sickafus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:23
CPC Classifications
G; G01; G01R; G01R13/00; G01R13/20; G01R13/22; G01R13/26; H; H01; H01J; H01J29/00; H01J29/46; H01J29/52; H01J3/00; H01J3/02; H04; H04N; H04N5/00; H04N5/66; H04N5/68
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
128 words
In an electron beam device of the type having an apertured electrode member and a source of electrons including an electron emitting filament and a power supply for this filament wherein the electron beam is comprised of electrons emitted by the source and which pass through the aperture of the electrode member, an electron beam regulating means comprising in combination: means, including an independent power supply, for electrically biasing the apertured electrode member to a predetermined electrical potential with respect to the source of electrons; and impedance means interconnecting the apertured electrode member and the filament for referencing to, but not otherwise directly affecting, the voltage of the filament, said means for biasing including negative feedback means for maintaining the apertured electrode member at said predetermined electrical potential.
Claim 2
Dependent Claim
128 words
In an electron beam device of the type having an apertured electrode member and a source of electrons including an electron emitting filament and a power supply for this filament wherein the electron beam is comprised of electrons emitted by the source and which pass through the aperture of the electrode member, an electron beam regulating means comprising in combination: means, including an independent power supply, for electrically biasing the apertured electrode member to a predetermined electrical potential with respect to the source of electrons; and impedance means interconnecting the apertured electrode member and the filament for referencing to, but not otherwise directly affecting, the voltage of the filament, said means for biasing including negative feedback means for maintaining the apertured electrode member at said predetermined electrical potential.
Claim 3
Dependent Claim
60 words
The electron beam regulating means of claim 1 wherein the means for biasing further include an operational amplifier having an output terminal and an inverting input terminal said output terminal connected to the apertured electrode member and the independent power supply connected to said inverting input terminal, said negative feedback means interconnecting said inverting input terminal and said impedance means.
Claim 4
Dependent Claim
23 words
The electron beam regulating means for claim 2 wherein said feedback means interconnect the output of said operational amplifier with the inverting input.
Claim 5
Dependent Claim
36 words
The electron beam regulating means of claim 2 wherein said feedback means interconnect the inverting input of the operational amplifier with a point of said impedance means having a constant potential with respect to the filament.
Claim 6
Dependent Claim
55 words
The electron beam regulating means of claim 4 wherein said impedance means include a unidirectional current flow device having two electrodes with a first electrode connected to the filament and arranged to permit electron flow therethrough from the filament, said negative feedback means being connected to the other electrode of said unidirectional current flow device.
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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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |