US5138147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Proximity x-ray image intensifier tube
Assignee: US Philips Corp
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Filing: 1991-02-05
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Granted: 1992-08-11
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Expires: 2011-02-05
Abstract
Abstract An X-ray image intensifier tube includes an entrance screen with a photocathode and, opposite thereto and at a slight distance therefrom, is a detection screen for detecting entrance image signals intensified by the proximity tube. The detection screen comprises a phosphor layer and an integrated matrix of detection elements within the tube envelope. The detection screen can be read in a location-sensitive manner and produces signals which can be directly electrically processed. The detection screen may be provided with a metal layer enabling brightness control and be mounted completely or partly outside the tube. The tube is assembled using low-temperature thermocompression seals wherever desired. The latter is applicable to the tube seal, so that the risk of deactivation of the photocathode is avoided.
Inventors
- 👤 Gerardus van Aller
- 👤 Guido T. M. Mulder
- 👤 Engelbertus Rongen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:47
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/50; H01J31/505
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
116 words
An X-ray image intensifier tube, comprising an envelope which is to be evacuated and which comprises an entrance window and an exit wall portion, an entrance screen secured to the envelope and provided with a luminescent layer and a photocathode, a proximity electron-intensifier system and an exit screen secured to the envelope for the detection of an electron beam emanating from the photocathode, said exit screen comprising a phosphor layer and an integrated matrix of detection elements for converting image signals carried by photoelectrons into electric signals which can be read in a location-dependent manner, said phosphor layer being between the photocathode and the detection elements, said matrix of detection elements being accommodated in said envelope.
Claim 2
Dependent Claim
116 words
An X-ray image intensifier tube, comprising an envelope which is to be evacuated and which comprises an entrance window and an exit wall portion, an entrance screen secured to the envelope and provided with a luminescent layer and a photocathode, a proximity electron-intensifier system and an exit screen secured to the envelope for the detection of an electron beam emanating from the photocathode, said exit screen comprising a phosphor layer and an integrated matrix of detection elements for converting image signals carried by photoelectrons into electric signals which can be read in a location-dependent manner, said phosphor layer being between the photocathode and the detection elements, said matrix of detection elements being accommodated in said envelope.
Claim 3
Dependent Claim
29 words
An X-ray image intensifier tube as claimed in claim 1, wherein the matrix of detection elements includes connections which read the matrix and which pass through the tube wall.
Claim 4
Dependent Claim
16 words
An X-ray image intensifier tube as claimed in claim 1 wherein the detection elements comprise photodiodes.
Claim 5
Dependent Claim
22 words
An X-ray image intensifier tube as claimed in claim 1 wherein the matrix of detection elements comprises an orthogonal matrix of photodiodes.
Claim 6
Dependent Claim
32 words
An X-ray image intensifier tube as claimed in claim 1 wherein the detection elements comprise a combination of a diode matrix and a thin-film transistor (TFT) integrated matrix of read switching elements.
Claim 7
Dependent Claim
17 words
An X-ray image intensifier tube as claimed in claim 1 wherein the tube has a rectangular shape.
Claim 8
Dependent Claim
46 words
An X-ray image intensifier tube as claimed in claim 6 wherein the tube envelope comprises a sleeve, an entrance plate and an exit plate, at least one of the entrance plate and the exit plate being connected to the sleeve by way of a thermocompression seal.
Claim 9
Dependent Claim
23 words
An X-ray image intensifier tube as claimed in claim 7 wherein said thermocompression seal comprises an intermediate material having a low melting point.
Claim 10
Dependent Claim
27 words
An X-ray image intensifier tube as claimed in claim 8, including a thermocompression seal which seals the tube between an exit wall portion and a sleeve portion.
Claim 11
Dependent Claim
31 words
An X-ray image intensifier tube as claimed in claim 7 wherein at least one of said entrance window and exit window includes an adhesive metal layer to form said thermocompression seal.
Claim 12
Dependent Claim
25 words
An X-ray image intensifier tube as claimed in claim 1 wherein the entrance luminescent layer is on a flat substrate attached to a mounting frame.
Claim 13
Dependent Claim
31 words
An X-ray image intensifier tube as claimed in claim 11, wherein the substrate is made of aluminium and is connected to the frame under tension by way of a thermocompression seal.
References Cited (Backward Citations)
GB1064073A
Cited
GB1392356A
Cited
US3825763A
Cited
US3699375A
Cited
US4300046A
Cited
US4447721A
Cited
US4471378A
Cited
US4365269A
Cited
US4599740A
Cited
US4842894A
Cited
US4855587A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-08-11 | 1996-02-10 | 1996-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-11 | 2000-02-10 | 2000-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-11 | 2004-02-10 | 2004-08-11 | $7700.00 | Window Closed / Lapsed |