US4979199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microfocus X-ray tube with optical spot size sensing means
Assignee: General Electric Co
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Filing: 1989-10-31
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Granted: 1990-12-18
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Expires: 2009-10-31
Abstract
Abstract A microfocus X-ray tube has an anode that emits X-rays and, a biproduct of its waste heat, visible and near infrared light. This invention uses the biproduct light to adjust and maintain the focus of the electron beam and enhance the performance of the X-ray tube as a point source of X-rays. Only the light is reflected by a mirror along a path in which a viewport is placed in the tube envelope. An sensor, e.g., a photodiode, or television camera, is placed in the path. A display means, e.g., a television display, meter, etc., can be connected to the sensing means to display the emitting spot of the anode or the amplitude of the emission. The focus of the X-ray tube is assured by observing the biproduct light and adjusting the electron beam to either minimize the size of the glowing spot or maximizing its apparent brightness. A method for use with an emitter of first and second types of radiation comprises reflecting only the second type of radiation, and sensing the reflected radiation. A microfocus X-ray tube features a mirror for reflecting light but not X-rays. A viewport such as quartz can be disposed in the path of the reflected light in the tube envelope.
Inventors
- 👤 Michael K. Cueman
- 👤 Lewis J. Thomas, III
- 👤 Casmir R. Trzaskos
- 👤 August D. Matula
- 👤 Michael J. Austin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:47
CPC Classifications
H; H05; H05G; H05G1/00; H05G1/08; H05G1/26; H01; H01J; H01J35/00; H01J35/02; H01J35/14; H01J35/147; H05G1/30; H05G1/36; H05G1/52
Claims Analysis
Total Claims: 43
Claim 1
Independent Claim
45 words
Apparatus for use with a means for emitting first and second types of radiation, said apparatus comprising: means, disposed proximate the emitting means, for reflecting only said second type of radiation along a path; and means, disposed in said path, for sensing the reflected radiation.
Claim 2
Dependent Claim
45 words
Apparatus for use with a means for emitting first and second types of radiation, said apparatus comprising: means, disposed proximate the emitting means, for reflecting only said second type of radiation along a path; and means, disposed in said path, for sensing the reflected radiation.
Claim 3
Dependent Claim
20 words
The apparatus of claim 1 further comprising said emitting means, said emitting means comprising an X-ray tube having an anode.
Claim 4
Dependent Claim
16 words
The apparatus of claim 2 wherein said tube further comprises a viewport disposed in said path.
Claim 5
Dependent Claim
12 words
The apparatus of claim 1 wherein said reflecting means comprises a mirror.
Claim 6
Dependent Claim
25 words
The apparatus of claim 1 wherein said first type of radiation comprises X-rays and said second type of radiation comprises visible and near infrared light.
Claim 7
Dependent Claim
12 words
The apparatus of claim 1 wherein said sensing means comprises a photodiode.
Claim 8
Dependent Claim
13 words
The apparatus of claim 1 wherein said sensing means comprises a television camera.
Claim 9
Dependent Claim
17 words
The apparatus as claimed in claim 1 further comprising a display means coupled to said sensing means.
Claim 10
Dependent Claim
64 words
Apparatus for use with a microfocus X-ray tube having an anode means for emitting X-rays, and visible and near infrared light, when subject to impinging electrons, said apparatus comprising: a mirror means, disposed proximate the anode, for reflecting only the visible and the near infrared light along a path; and means, disposed in said path, for sensing the reflected visible and near infrared light.
Claim 11
Dependent Claim
64 words
Apparatus for use with a microfocus X-ray tube having an anode means for emitting X-rays, and visible and near infrared light, when subject to impinging electrons, said apparatus comprising: a mirror means, disposed proximate the anode, for reflecting only the visible and the near infrared light along a path; and means, disposed in said path, for sensing the reflected visible and near infrared light.
Claim 12
Dependent Claim
20 words
The apparatus of claim 9, wherein said tube has an envelope, said envelope having a viewport disposed in said path.
Claim 13
Dependent Claim
16 words
The apparatus of claim 10, wherein said mirror means and said viewport are in opposing relationship.
Claim 14
Dependent Claim
10 words
The apparatus of claim 10 wherein said viewport comprises quartz.
Claim 15
Dependent Claim
10 words
The apparatus of claim 9 wherein said mirror is silvered.
Claim 16
Dependent Claim
12 words
The apparatus of claim 9 wherein said sensing means comprises a photodiode.
Claim 17
Dependent Claim
13 words
The apparatus of claim 9 wherein said sensing means comprises a television camera.
Claim 18
Dependent Claim
12 words
The apparatus of claim 15 wherein said camera comprises a color camera.
Claim 19
Dependent Claim
13 words
The apparatus of claim 15 wherein said sensing means comprises a CCD imager.
Claim 20
Dependent Claim
15 words
The apparatus of claim 1 further comprising a display means coupled to said sensing means.
Claim 21
Dependent Claim
13 words
The apparatus of claim 18 wherein said display means comprises a television display.
Claim 22
Dependent Claim
12 words
The apparatus of claim 19 wherein said display comprises a color display.
Claim 23
Dependent Claim
32 words
The apparatus of claim 9 wherein said tube has a control grid and a focussing means, and said apparatus further comprises means for adjusting the focussing and intensity of the emitted X-rays.
Claim 24
Dependent Claim
36 words
The apparatus of claim 21 wherein said adjusting means comprises a variable voltage power supply adapted to be coupled to the grid, and a variable current power supply adapted to be coupled to the focussing means.
Claim 25
Independent Claim
29 words
A method for use with an emitter of first and second types of radiation, said method comprising: reflecting only said second type of radiation; and sensing the reflected radiation.
Claim 26
Independent Claim
29 words
A method for use with an emitter of first and second types of radiation, said method comprising: reflecting only said second type of radiation; and sensing the reflected radiation.
Claim 27
Dependent Claim
25 words
The method of claim 23 wherein said first type of radiation comprises X-rays and said second type of radiation comprises visible and near infrared light.
Claim 28
Dependent Claim
11 words
The method of claim 23 wherein said sensing step comprises imaging.
Claim 29
Dependent Claim
12 words
The method of claim 25 wherein said imaging step comprises color imaging.
Claim 30
Dependent Claim
11 words
The method of claim 23 further comprising displaying the sensed radiation.
Claim 31
Dependent Claim
13 words
The method of claim 27 wherein said displaying step comprises displaying in color.
Claim 32
Dependent Claim
10 words
The method of claim 23 further comprising adjusting the emitter.
Claim 33
Dependent Claim
17 words
The method of claim 29 wherein said adjusting step comprises adjusting intensity and focus of the emitter.
Claim 34
Dependent Claim
82 words
A microfocus X-ray tube comprising: a longitudinal envelope having first and second ends; a cathode means, disposed proximate said first end, for emitting electrons; a focussing means, disposed between said ends, for focussing the emitted electrons; an anode means, disposed at said second end for emitting X-rays, and visible and near infrared light in response to the impingement of said electrons; and a mirror means, disposed proximate said anode means, for reflecting only said visible and near infrared light along a path.
Claim 35
Dependent Claim
82 words
A microfocus X-ray tube comprising: a longitudinal envelope having first and second ends; a cathode means, disposed proximate said first end, for emitting electrons; a focussing means, disposed between said ends, for focussing the emitted electrons; an anode means, disposed at said second end for emitting X-rays, and visible and near infrared light in response to the impingement of said electrons; and a mirror means, disposed proximate said anode means, for reflecting only said visible and near infrared light along a path.
Claim 36
Dependent Claim
14 words
The tube of claim 31 wherein said cathode means comprises a directly heated cathode.
Claim 37
Dependent Claim
12 words
The tube of claim 31 wherein said focussing means comprises a coil.
Claim 38
Dependent Claim
10 words
The tube of claim 31 wherein said anode comprises tungsten.
Claim 39
Dependent Claim
13 words
The tube of claim 31 wherein said mirror means comprises a silvered mirror.
Claim 40
Dependent Claim
16 words
The tube of claim 31 further comprising a viewport disposed in said envelope in said path.
Claim 41
Dependent Claim
10 words
The tube of claim 36 wherein said viewport comprises quartz.
Claim 42
Dependent Claim
16 words
The tube of claim 36 wherein said viewport and said mirror means are in opposing relationship.
Claim 43
Dependent Claim
20 words
The tube of claim 31 further comprising a control grid disposed between said cathode means and said electron lens means.
References Cited (Backward Citations)
US2340363A
Cited
US2878393A
Cited
US4400823A
Cited
US4426722A
Cited
US4688241A
Cited
US4607380A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-17 | 1994-06-18 | 1994-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-17 | 1998-06-18 | 1998-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-17 | 2002-06-18 | 2002-12-18 | $7700.00 | Window Closed / Lapsed |