Patent JPS63253792A successfully refreshed from Google Patents.
US3746909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Area electron flood gun
Assignee: Northrop Grumman Corp
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Filing: 1970-10-26
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Granted: 1973-07-17
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Expires: 1990-10-26
Abstract
Abstract A strip filament provides a source of electrons. A deflector electrode, which may be in the general form of a parabolic dish, is placed behind the filament and a screen electrode placed forward of the filament, i.e., in the direction in which electron flow is desired. The electrodes are positioned relative to the filament and have potentials applied thereto such that the electrons emitted from the filament are evenly distributed over a predetermined area throughout which electron flow is desired.
Inventors
- 👤 R Runtzel
- 👤 W Goede
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:08
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/48; H01J29/488
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
182 words
An electron flood gun for providing a uniform flow of electrons over a predetermined area comprising: elongated linear filament means for generating electrons, deflector electrode means positioned proximate to said filament means and partially surrounding said filament means so as to prevent electron flow away from the direction in which the flow of electrons is desired, said deflector electrode means being in the form of a single conductive parabolic shell substantially co-extensive with said filament means, said filament means being positioned along the focal point of the parabola formed by such shell, director electrode means placed proximate to said filament means in a direction therefrom towards which the flow of electrons is desired, said director electrode means having a surface area substantially equal to the area over which the electron flow is desired, means for applying successively higher potentials than that on said filament means to said deflector electrode means and said director electrode means respectively whereby the electrodes from said filament means are accelerated through said director electrode means and arranged in a substantially uniform pattern over the predetermined flow area.
Claim 2
Dependent Claim
182 words
An electron flood gun for providing a uniform flow of electrons over a predetermined area comprising: elongated linear filament means for generating electrons, deflector electrode means positioned proximate to said filament means and partially surrounding said filament means so as to prevent electron flow away from the direction in which the flow of electrons is desired, said deflector electrode means being in the form of a single conductive parabolic shell substantially co-extensive with said filament means, said filament means being positioned along the focal point of the parabola formed by such shell, director electrode means placed proximate to said filament means in a direction therefrom towards which the flow of electrons is desired, said director electrode means having a surface area substantially equal to the area over which the electron flow is desired, means for applying successively higher potentials than that on said filament means to said deflector electrode means and said director electrode means respectively whereby the electrodes from said filament means are accelerated through said director electrode means and arranged in a substantially uniform pattern over the predetermined flow area.
Claim 3
Dependent Claim
23 words
The device of claim 1 wherein said director electrode means comprises wire mesh screens positioned substantially at the mouth of said parabolic shell.
Claim 4
Dependent Claim
130 words
An electron flood gun for providing a uniform flow of electrons over a predetermined area comprising: elongated linear filament means for generating electrons, a conductive elongated parabolic shell substantially co-extensive with said filament means and having an open mouth portion, said filament means being supported in said shell along the focal point of the parabola formed thereby, conductive grid means placed proximate to the mouth portion of said shell, said grid means substantially encompassing the area of said mouth portion, means for applying potentials to said shell and said grid means for accelerating the electrons out of said shell through said grid means, said shell forming a deflector electrode and said grid means forming director electrode means for arranging the electrons in a substantially uniform pattern over said predetermined area.
Claim 5
Dependent Claim
130 words
An electron flood gun for providing a uniform flow of electrons over a predetermined area comprising: elongated linear filament means for generating electrons, a conductive elongated parabolic shell substantially co-extensive with said filament means and having an open mouth portion, said filament means being supported in said shell along the focal point of the parabola formed thereby, conductive grid means placed proximate to the mouth portion of said shell, said grid means substantially encompassing the area of said mouth portion, means for applying potentials to said shell and said grid means for accelerating the electrons out of said shell through said grid means, said shell forming a deflector electrode and said grid means forming director electrode means for arranging the electrons in a substantially uniform pattern over said predetermined area.
Claim 6
Dependent Claim
183 words
An electron flood gun for providing a uniform flow of electrons over a predetermined area comprising: a plurality of elongated linear filaments for generating electrons, deflector electrode means positioned proximate to said filaments and partially surrounding said filaments so as to prevent electron flow away from the direction in which the flow of electrons is desired, said deflector electrode means being in the form of a plurality of elongated arcuate shell members arranged in side by side relationship, a separate one of said filaments being positioned within an associated one of each of said shell members, director electrode means placed proximate to said filaments in a direction therefrom towards which the flow of electrons is desired, said director electrode means having a surface area substantially equal to the area over which the electron flow is desired, means for applying successively higher potentials than that on said filaments to said deflector electrode means and said director electrode means respectively, whereby the electrons from said filaments are accelerated through said director electrode means and arranged in a substantially uniform pattern over the predetermined flow area.
Claim 7
Dependent Claim
183 words
An electron flood gun for providing a uniform flow of electrons over a predetermined area comprising: a plurality of elongated linear filaments for generating electrons, deflector electrode means positioned proximate to said filaments and partially surrounding said filaments so as to prevent electron flow away from the direction in which the flow of electrons is desired, said deflector electrode means being in the form of a plurality of elongated arcuate shell members arranged in side by side relationship, a separate one of said filaments being positioned within an associated one of each of said shell members, director electrode means placed proximate to said filaments in a direction therefrom towards which the flow of electrons is desired, said director electrode means having a surface area substantially equal to the area over which the electron flow is desired, means for applying successively higher potentials than that on said filaments to said deflector electrode means and said director electrode means respectively, whereby the electrons from said filaments are accelerated through said director electrode means and arranged in a substantially uniform pattern over the predetermined flow area.
Claim 8
Dependent Claim
16 words
The device of claim 4 wherein said shells are substantially in the form of half cylinders.
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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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |