US3906228A - X-ray photographic process - Google Patents

X-ray photographic process Download PDF

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Publication number
US3906228A
US3906228A US405057A US40505773A US3906228A US 3906228 A US3906228 A US 3906228A US 405057 A US405057 A US 405057A US 40505773 A US40505773 A US 40505773A US 3906228 A US3906228 A US 3906228A
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US
United States
Prior art keywords
selenium
arsenic
layer
photographic process
ray photographic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US405057A
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English (en)
Inventor
Gottfried Lange
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Corp filed Critical Siemens Corp
Application granted granted Critical
Publication of US3906228A publication Critical patent/US3906228A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
    • G03G5/02—Charge-receiving layers
    • G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
    • G03G5/08—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being inorganic
    • G03G5/082—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being inorganic and not being incorporated in a bonding material, e.g. vacuum deposited
    • G03G5/08207—Selenium-based
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G13/00—Electrographic processes using a charge pattern
    • G03G13/054—Electrographic processes using a charge pattern using X-rays, e.g. electroradiography
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/054—Apparatus for electrographic processes using a charge pattern using X-rays, e.g. electroradiography
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
    • Y10S430/167—X-ray
    • Y10S430/168—X-ray exposure process

Definitions

  • This invention relates to an X-ray photographic process wherein an electrically conducting plate coated with a selenium layer containing arsenic, is electrically charged in a corona discharge arrangement and is then subjected to image forming X-rays. Then the electrical image which is not visible as yet is made visible by the usual xerographic development. These processes are used since they have a sensitive material which is made sensitive only at the moment of photographing and also because they are quick and inexpensive.
  • An object of the present invention is to avoid particularly the appearance of ghost images without increasing the costs.
  • the arrangement of the present invention increases X-ray sensitivity and provides a substantially greater piercing strength, since the application with small amounts of arsenic substantially suppresses the disturbing band conductivity of pure amorphous selenium.
  • This improvement is further increased by the negative charging already at small amounts of arsenic of 0.1 to 0.4%. At the same time, this provides greater shift passages for the photoelectrically formed charge carriers and thus increases the X-ray sensitivity.
  • the charge storage is substantially improved in negative charging. Relative to the charging position, the dark conductivity is improved by a factor of about 5. No ghost images appear even when X-ray photographs follow closely one after the other. This is obviously caused by the fact that certain trap levels in the band which in case of pure amorphous selenium are always present in large numbers (10 10 cm), are filled by arsenic and thus prevent the reception of movable charge carriers. The freeing of charge carriers in the case of pure selenium can take place by heating and then the so-called ghost images will be removed again. However, this heating constitutes an additional operational step and is also detrimental since it changes the structure of selenium.
  • the present invention can be used with all known xerographic devices. It is merely necessary that the actual sensitive layer be replaced by the layer of the present invention and that the corona charge unit have polarity reversal.
  • the layer can be made according to all known processes, for example, by steaming the corresponding mixture of selenium and arsenic upon a carrier which due to its electrical conductivity can consist of metal or other conducting material.
  • a carrier which due to its electrical conductivity can consist of metal or other conducting material.
  • various metals such as aluminum, brass, bronze etc. are useable.
  • Other materials are metallized paper or conductingly made plastic.
  • the treatment can be carried out with a conducting material, such as copper iodide, provided upon an insulating material.
  • FIGURE is a diagrammatic sectional view illustrating the subject of the present invention.
  • the drawing shows a carrier 1 of aluminum having a thickness of 0.5 to 2 mm upon which is steamed a layer 2 of selenium containing 0.3% arsenic.
  • the thickness of layer 2 amounts to to 500
  • the combination of the layer 2 and carrier 1 is moved in the direction of the arrow 3 under the corona discharge unit 4 so that a discharge is produced between the comb-shaped electrode 5 and the grounded plate 6 and the surface of the layer 2 is negatively charged.
  • the positive pole of the high voltage source 8 which produces a voltage difference of about 5,500 v., is grounded by the line 7.
  • the electrode 5 lies at the negative pole.
  • selenium containing 0.3% arsenic heated to 50C. is vacuum deposited on an aluminum foil which is 0.5 to 2 mm thick, preferably 1 mm.
  • the deposition is carried out as evaporation which takes place in vacuum 10 to 10 torr and with a speed of about 3p. per minute until the layer has received the required thickness amounting as a rule to 100 to 500p.
  • a method of imaging with X-rays by exposing to image-carrying X-rays a layer of selenium-arsenic containing 0.01-1 atom percent arsenic, said layer being bonded directly to an electrically conducting plate and negatively charged in a corona discharge device.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Pathology (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)
US405057A 1972-10-16 1973-10-10 X-ray photographic process Expired - Lifetime US3906228A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2250689A DE2250689C3 (de) 1972-10-16 1972-10-16 Elektrofotografisches Röntgenaufnahmeverfahren

Publications (1)

Publication Number Publication Date
US3906228A true US3906228A (en) 1975-09-16

Family

ID=5859181

Family Applications (1)

Application Number Title Priority Date Filing Date
US405057A Expired - Lifetime US3906228A (en) 1972-10-16 1973-10-10 X-ray photographic process

Country Status (5)

Country Link
US (1) US3906228A (enrdf_load_stackoverflow)
JP (1) JPS4974943A (enrdf_load_stackoverflow)
DE (1) DE2250689C3 (enrdf_load_stackoverflow)
FR (1) FR2203099B1 (enrdf_load_stackoverflow)
GB (1) GB1451790A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4770965A (en) * 1986-12-23 1988-09-13 Xerox Corporation Selenium alloy imaging member
US4983484A (en) * 1988-12-22 1991-01-08 Fuji Electric Co., Ltd. Arsenic-selenium photosensitive material for use in electronic photography
US4998266A (en) * 1988-05-06 1991-03-05 U.S. Philips Corporation Device for producing x-ray images by means of a photoconductor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3227294A1 (de) * 1982-07-21 1984-01-26 Siemens AG, 1000 Berlin und 8000 München Roentgenelektrofotografisches aufzeichnungsmaterial und verfahren zur erzeugung eines elektrischen ladungsbildes

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2863768A (en) * 1955-07-05 1958-12-09 Haloid Xerox Inc Xerographic plate
US3621248A (en) * 1966-02-16 1971-11-16 Xerox Corp Method of using a xeroradiographic plate which is insensitive to visible light
US3712810A (en) * 1970-12-18 1973-01-23 Xerox Corp Ambipolar photoreceptor and method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5522783B1 (enrdf_load_stackoverflow) * 1967-08-29 1980-06-19

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2863768A (en) * 1955-07-05 1958-12-09 Haloid Xerox Inc Xerographic plate
US3621248A (en) * 1966-02-16 1971-11-16 Xerox Corp Method of using a xeroradiographic plate which is insensitive to visible light
US3712810A (en) * 1970-12-18 1973-01-23 Xerox Corp Ambipolar photoreceptor and method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4770965A (en) * 1986-12-23 1988-09-13 Xerox Corporation Selenium alloy imaging member
US4998266A (en) * 1988-05-06 1991-03-05 U.S. Philips Corporation Device for producing x-ray images by means of a photoconductor
US4983484A (en) * 1988-12-22 1991-01-08 Fuji Electric Co., Ltd. Arsenic-selenium photosensitive material for use in electronic photography

Also Published As

Publication number Publication date
GB1451790A (en) 1976-10-06
DE2250689C3 (de) 1980-09-18
DE2250689A1 (de) 1974-04-18
JPS4974943A (enrdf_load_stackoverflow) 1974-07-19
FR2203099A1 (enrdf_load_stackoverflow) 1974-05-10
FR2203099B1 (enrdf_load_stackoverflow) 1977-03-11
DE2250689B2 (de) 1980-01-10

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