EP0026663A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Automatic exposure controlled radiography
Assignee: GENERAL X-RAY Corp
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Filing: 1980-09-29
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Granted: —
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Expires: 2000-09-29
Abstract
Abstract An X-ray detector comprises an insulating rectangular detector plate having printed thereon a pair of interpositioned copper conductor combs. The combs are interleaved to form a pattern of parallel closely spaced conductor fingers. Impinging radiation creates surface conduction, allowing current to flow between the two combs. Electronic circuitry monitors the current flow between the combs. The integral of this current flow is sensed by a threshold detector which is preset to turn the radiation source off when a particular current integral level is reached. The detector plate is designed to be an integral part of the film cassette holder during the exposure of radiographs.
Inventors
- 👤 Jorge G. Codina
- 👤 Edward O'neil
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 01:02
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/16; G01T1/26; H; H05; H05G; H05G1/00; H05G1/08; H05G1/26; H05G1/30; H05G1/38; H05G1/42; H05G1/44
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
52 words
An X-ray detector comprising: A) an amorphous non-photoconductive, electrical insulator providing a first surface; and B) a pair of electrical conducting conblike patterns on said surface the tine portions thereof interlaced but not connected together, the said detector patterns preferably substantially conforming to the area of a body part to be X-rayed.
Claim 2
Dependent Claim
52 words
An X-ray detector comprising: A) an amorphous non-photoconductive, electrical insulator providing a first surface; and B) a pair of electrical conducting conblike patterns on said surface the tine portions thereof interlaced but not connected together, the said detector patterns preferably substantially conforming to the area of a body part to be X-rayed.
Claim 3
Dependent Claim
31 words
The X-ray detector defined in claim 1 and: C) circuit means connected to said detector patterns for integrating the change of resistance between said patterns when they are subjected to X-rays.
Claim 4
Dependent Claim
32 words
An X-ray detector according to claim 2, said circuit means further comprising means for detecting when the integral of the change in resistance reaches a preset level to provide an interrupt signal.
Claim 5
Dependent Claim
23 words
An x-ray detector according to claim 3, and further comprising D) an X-ray controller responsive to said interrupt signal to discontinue a radiograph.
Claim 6
Dependent Claim
48 words
An x-ray detector according to claim 1 or 2 wherein said insulator is made of a material that is impervious to water e.g. a glass epoxy material and further comprising e.g. D) means for hermetically sealing the detector with a water free gas in contact with said surface.
Claim 7
Dependent Claim
29 words
An X-ray detector according to claim 1 or 2 and further comprising C) a pair of sheet conductors, one on each side of said insulator, said conductors connected together.
Claim 8
Dependent Claim
29 words
An X-ray detector according to claim 6 and further comprising D) a sheet conductor on said surface surrounding said comblike patterns and connected to said pair of sheet conductors.
Claim 9
Dependent Claim
57 words
An X-ray detector according to claim 7 and further comprising E) circuit means having a signal ground and connected to said detector patterns for integrating the change of resistance between said patterns when they are subjected to X-rays; and F) said pair of sheet conductors and said sheet conductor on said surface connected to said signal ground.
Claim 10
Dependent Claim
36 words
An X-ray detector according to claim 3 and further comprising D) means allowing the user to select one of a plurality of preset levels corresponding to preselected combinations of fluorescent screen and X - ray film.
Claim 11
Dependent Claim
31 words
An X-ray detector accordhg to claim 9 and further comprising E) means for allowing the user to slightly vary the response of said integrating circuit means to said change of resistance.
References Cited (Backward Citations)
No citation records indexed.
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