US4159436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron beam focussing for X-ray apparatus
Assignee: Thor Cryogenics Ltd
•
Filing: 1978-01-16
•
Granted: 1979-06-26
•
Expires: 1998-01-16
Abstract
Abstract In X-ray apparatus having an electron beam gun producing a beam of electrons to be focussed on an X-ray producing target, in addition to a first focussing electrode on the gun structure, there is provided an auxiliary focussing means, comprising an electrostatic focussing electrode or electrodes or an electro-magnetic focussing coil or coils separately mounted to be adjustable in position in three orthogonal directions.
Inventors
- 👤 Raymond V. Ely
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:54
CPC Classifications
H; H01; H01J; H01J35/00; H01J35/02; H01J35/04; H01J35/06; H01J35/066; H01J35/14; H01J35/147
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
204 words
X-ray apparatus comprising: an outer envelope, an electron beam source mounted within said envelope and including an insulating cylinder, a piston slidable within said cylinder, a filament mounted on said piston, and an apertured biasing element carried on said cylinder to extend around the electron beam path in front of the filament, a target mounted within said envelope and located in the electron beam path beyond said biasing element, to permit electrons to bombard said target to produce X-rays, means sealing said electron beam source and target within said outer envelope, a support member on said envelope and having a vacuum seal, focussing means including an insulating support in the form of a rod or tube of insulating material extending orthogonally to the axis of the electron beam and slidable in the axial direction of the rod or tube through said vacuum seal to permit movement of the focussing means in one directoion orthogonal to the axis of the electron beam, said insulating support further being adjustable in the direction of the axis of the electron beam between the filament and target and in a direction orthogonal to the axis of the electron beam and to the axial direction of said rod or tube.
Claim 2
Dependent Claim
204 words
X-ray apparatus comprising: an outer envelope, an electron beam source mounted within said envelope and including an insulating cylinder, a piston slidable within said cylinder, a filament mounted on said piston, and an apertured biasing element carried on said cylinder to extend around the electron beam path in front of the filament, a target mounted within said envelope and located in the electron beam path beyond said biasing element, to permit electrons to bombard said target to produce X-rays, means sealing said electron beam source and target within said outer envelope, a support member on said envelope and having a vacuum seal, focussing means including an insulating support in the form of a rod or tube of insulating material extending orthogonally to the axis of the electron beam and slidable in the axial direction of the rod or tube through said vacuum seal to permit movement of the focussing means in one directoion orthogonal to the axis of the electron beam, said insulating support further being adjustable in the direction of the axis of the electron beam between the filament and target and in a direction orthogonal to the axis of the electron beam and to the axial direction of said rod or tube.
Claim 3
Dependent Claim
19 words
X-ray apparatus as claimed in claim 1 wherein the further focussing means comprise an auxiliary electrode for electrostatic focussing.
Claim 4
Dependent Claim
17 words
X-ray apparatus as claimed in claim 2 and having an adjustable voltage supply for said auxiliary electrode.
Claim 5
Dependent Claim
18 words
X-ray apparatus as claimed in claim 1 wherein the further focussing means comprises a cylindrical electromagnetic focussing coil.
Claim 6
Dependent Claim
17 words
X-ray apparatus as claimed in claim 4 and having an adjustable current supply for said focussing coil.
Claim 7
Dependent Claim
25 words
X-ray apparatus as claimed in claim 1 wherein said support member is of cylindrical form, and the rod or tube extends through the support member.
Claim 8
Dependent Claim
64 words
Apparatus as claimed in claim 1 wherein said support member is adjustably mounted with respect to the envelope for adjustment in two orthogonal directions at right angles to the axis of said rod or tube, the adjusting means being sealed to the envelope, whereby the focussing means is adjustable in said orthogonal directions at right angles to the axis of the rod or tube.
Claim 9
Dependent Claim
145 words
X-ray apparatus comprising: an outer envelope, an electron beam source mounted within said envelope and including an insulating cylinder, a piston slidable within said cylinder, a filament mounted on said piston, and an apertured biasing element carried on said cylinder to extend, around the electron beam path in front of the filament, a target mounted within said envelope and located in the electron beam path beyond said biasing element, to permit electrons to bombard said target to produce X-rays, means sealing said electron beam source and target within said outer envelope, focussing means including an insulating support separately mounted in said envelope and at least two focussing electrodes or coils on said insulating support and having separately adjustable electrical supplies, said insulating support being adjustable on the direction of the axis of the electron beam between the filament and target and in directions orthogonal thereto.
Claim 10
Dependent Claim
145 words
X-ray apparatus comprising: an outer envelope, an electron beam source mounted within said envelope and including an insulating cylinder, a piston slidable within said cylinder, a filament mounted on said piston, and an apertured biasing element carried on said cylinder to extend, around the electron beam path in front of the filament, a target mounted within said envelope and located in the electron beam path beyond said biasing element, to permit electrons to bombard said target to produce X-rays, means sealing said electron beam source and target within said outer envelope, focussing means including an insulating support separately mounted in said envelope and at least two focussing electrodes or coils on said insulating support and having separately adjustable electrical supplies, said insulating support being adjustable on the direction of the axis of the electron beam between the filament and target and in directions orthogonal thereto.
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) | 1982-06-25 | 1982-12-25 | 1983-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-25 | 1986-12-25 | 1987-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-25 | 1990-12-25 | 1991-06-26 | $7700.00 | Window Closed / Lapsed |