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US4482619A
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X-Ray electro-photographic recording material and method for generating an electrical charge image in such material
Assignee: Siemens AG
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Filing: 1983-05-12
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Granted: 1984-11-13
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Expires: 2003-05-12
Abstract
Abstract An x-ray electro-photographic recording material is formed of a photo-conductive layer (1) comprised of a selenium-arsenic alloy and positioned on a transparent electrode layer (4), which is positioned on a further layer (3) comprised of an x-ray luminophore and positioned on a reflective surface (2a) of a film carrier layer (2). In usage, with a positive corona charge on the free photo-conductive layer surface (1a) before x-ray exposure, the luminophore-containing layer (3), during x-ray exposure, converts a component (5) of the x-ray radiation (γ) not absorbed by the photo-conductive layer (1) into visible luminescent light (6) which effects an increase of sensitivity in the photo-conductive layer (1). This recording material can be used in x-ray photograph devices.
Inventors
- 👤 Eberhard Bayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:48
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/14; G03G5/02; G03G5/04; G03G5/08; Y; Y10; Y10S; Y10S430/00; Y10S430/167; Y10S430/168
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
163 words
A method of generating an electrical charge image in a x-ray electro-photographic recording material comprised of successive contacting layers identified as follows: (a) an upper photo-conductive layer composed of a vapor-deposited selenium-arsenic alloy having from about 0.1 through 10 mole percent of arsenic therein and having a free surface, (b) an electrically-conductive layer composed of a transparent conductive material having inhibiting properties for negative charge carriers, (c) an intermediate layer comprised of an x-ray luminophore, and (d) a lower film carrier layer having a reflective surface facing said intermediate layer, said method comprising the steps of: positively charging said free surface of said photo-conductive layer in the dark by a corona discharge from an applied electrical field while maintaining said electrically conductive transparent layer as a cooperating electrode, thereby to produce a sensitive charge on said surface; and exposing said so-charged surface to an x-ray image, thereby to produce on said surface an x-ray electro-photographic charge pattern which is developable with a toner.
Claim 2
Independent Claim
163 words
A method of generating an electrical charge image in a x-ray electro-photographic recording material comprised of successive contacting layers identified as follows: (a) an upper photo-conductive layer composed of a vapor-deposited selenium-arsenic alloy having from about 0.1 through 10 mole percent of arsenic therein and having a free surface, (b) an electrically-conductive layer composed of a transparent conductive material having inhibiting properties for negative charge carriers, (c) an intermediate layer comprised of an x-ray luminophore, and (d) a lower film carrier layer having a reflective surface facing said intermediate layer, said method comprising the steps of: positively charging said free surface of said photo-conductive layer in the dark by a corona discharge from an applied electrical field while maintaining said electrically conductive transparent layer as a cooperating electrode, thereby to produce a sensitive charge on said surface; and exposing said so-charged surface to an x-ray image, thereby to produce on said surface an x-ray electro-photographic charge pattern which is developable with a toner.
Claim 3
Dependent Claim
24 words
The method according to claim 1 wherein, in said x-ray electro-photographic recording material, said selenium-arsenic alloy consists of Se 99 .5 As 0 .5.
Claim 4
Dependent Claim
27 words
The method of claim 1 wherein, in said x-ray electro-photographic recording material, said photo-conductive layer has a thickness in the range of about 50 through 300 μm.
Claim 5
Dependent Claim
41 words
The method of claim 1 wherein, in said x-ray electro-photographic recording material, said transparent, conductive material forming said electrically-conductive layer is selected from the group consisting of gold, aluminum, and an oxide mixture of 50 mol% indium and 50 mol% tin.
Claim 6
Dependent Claim
21 words
The method of claim 4 wherein said electrically-conductive layer has a thickness in the range of about 10 through 20 nm.
Claim 7
Dependent Claim
24 words
The method of claim 1 wherein, in said x-ray electro-photographic recording material, said x-ray luminophore in said intermediate layer is a rare earth oxysulfide.
Claim 8
Dependent Claim
21 words
The method of claim 6 wherein said intermediate layer has a thickness in the range of about 1 through 10 μm.
Claim 9
Dependent Claim
20 words
The method of claim 1 wherein, in said x-ray electro-photographic recording material, said film carrier layer is composed of aluminum.
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) | 1987-11-13 | 1988-05-14 | 1988-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-13 | 1992-05-14 | 1992-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-13 | 1996-05-14 | 1996-11-13 | $7700.00 | Window Closed / Lapsed |