US4122369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic deflection apparatus positioned behind target
Assignee: General Electric Co
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Filing: 1977-10-04
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Granted: 1978-10-24
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Expires: 1997-10-04
Abstract
Abstract An improved fine deflection, for use in an electron beam optical system, utilizes a magnetic deflector positioned adjacent to the surface of the target most remote from a matrix lens, which is positioned between the target and an electron beam emitter. The matrix lens is a single plate having multiple apertures forming matrix lenslets and has an electron beam accelerator positioned between the lens and the target for uniform acceleration of the electron beam passing through a selected one of the lenslets.
Inventors
- 👤 William C. Hughes
- 👤 Harold G. Parks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:14
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/80; H01J29/803; H01J29/806; H01J29/70; H01J29/72; H01J29/76; H01J31/00; H01J31/08; H01J31/58; H01J31/60
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
208 words
In an electron beam optical system of the type having an electron gun means for focussing a collimated electron beam upon one of a plurality of lenslets, and a planar target spaced from the electron gun and having a surface disposed essentially transverse to the direction of travel of the electron beam prior to deflection, which target surface is to be selectably illuminated by said electron beam, and improved fine deflection apparatus comprising: first means for producing a magnetic field parallel to said target surface and having an equimagnetic surface of selectively variable magnitude in a plane parallel to said target surface and disposed between said plurality of lenslets and said target surface; second means for producing another magnetic field parallel to said target surface and having an equimagnetic surface of magnitude selectively variable independent of the magnitude of the equimagnetic surface produced by said first means, the selectively variable field of said second means being produced in said plane; said first and second magnetic fields being substantially perpendicular to each other and to a normal to said target surface; said first and second means both being positioned entirely beyond the plane of said target surface with respect to said electron gun means and said plurality of lenslets.
Claim 2
Dependent Claim
208 words
In an electron beam optical system of the type having an electron gun means for focussing a collimated electron beam upon one of a plurality of lenslets, and a planar target spaced from the electron gun and having a surface disposed essentially transverse to the direction of travel of the electron beam prior to deflection, which target surface is to be selectably illuminated by said electron beam, and improved fine deflection apparatus comprising: first means for producing a magnetic field parallel to said target surface and having an equimagnetic surface of selectively variable magnitude in a plane parallel to said target surface and disposed between said plurality of lenslets and said target surface; second means for producing another magnetic field parallel to said target surface and having an equimagnetic surface of magnitude selectively variable independent of the magnitude of the equimagnetic surface produced by said first means, the selectively variable field of said second means being produced in said plane; said first and second magnetic fields being substantially perpendicular to each other and to a normal to said target surface; said first and second means both being positioned entirely beyond the plane of said target surface with respect to said electron gun means and said plurality of lenslets.
Claim 3
Dependent Claim
52 words
An improved magnetic fine deflection system as set forth in claim 1, wherein at least one of said first and second means comprises conductive means for forming an equipotential magnetic sheet in said plane and having a magnitude variably dependent upon the magnitude of a flow of current through said conductor means.
Claim 4
Dependent Claim
76 words
An improved magnetic fine deflection system as set forth in claim 1, wherein at least one of said first and second means comprises a plurality of parallel conductors arranged parallel to one another and to the plane of said target surface and forming an equipotential magnetic sheet in said magnetic field plane, said magnetic sheet having a magnitude variably dependent upon the magnitude of essentially equal flows of current through each of said plurality of conductors.
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) | 1981-10-23 | 1982-04-24 | 1982-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-23 | 1986-04-24 | 1986-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-23 | 1990-04-24 | 1990-10-24 | $7700.00 | Window Closed / Lapsed |