US3010043A - Image storage elements and process - Google Patents

Image storage elements and process Download PDF

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Publication number
US3010043A
US3010043A US595712A US59571256A US3010043A US 3010043 A US3010043 A US 3010043A US 595712 A US595712 A US 595712A US 59571256 A US59571256 A US 59571256A US 3010043 A US3010043 A US 3010043A
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US
United States
Prior art keywords
phosphor
image
electric field
zinc
sulfide
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
US595712A
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English (en)
Inventor
Wahlig Charles Frederick
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
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
Priority to NL109312D priority Critical patent/NL109312C/xx
Priority to NL218640D priority patent/NL218640A/xx
Application filed by EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Priority to US595712A priority patent/US3010043A/en
Priority to GB20530/57A priority patent/GB865969A/en
Priority to DEP18842A priority patent/DE1120036B/de
Priority to CH4793757A priority patent/CH375754A/de
Application granted granted Critical
Publication of US3010043A publication Critical patent/US3010043A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
    • G21K4/00—Conversion screens for the conversion of the spatial distribution of X-rays or particle radiation into visible images, e.g. fluoroscopic screens
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00
    • G11C13/04—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam
    • G11C13/048—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam using other optical storage elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
    • H01J31/12—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen
    • H01J31/122—Direct viewing storage tubes without storage grid
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources

Definitions

  • Another object is to provide such a process wherein the image storing element is characterized, while storing the image, by substantial insensitivity to variations in ambient temperature, including elevated temperatures, and substantial insensitivity to moisture and other surroundings usually considered unfavorable to image storage processes.
  • An additional object is to provide such a process wherein the storage material enables almost immediate release, as well as release after a prolonged period of time, of the stored image as visible light.
  • a further object is to provide such a process which permits quick erasure of the imposed image and prompt reuse of the storage material.
  • a still further object is to provide such a process which is relatively simple and of considerable utility in the art.
  • the novel storage element of this invention is a thin continuous tape comprising a thin layer containing a luminescent material and a binder for said luminescent material, wherein said luminescent material is characterized by meeting the requirements of the following test, which is carried out in its entirety in the presence of electromagnetic radiation of Wave length longer than about 500 millimicrons: namely, that after subjection of the luminescent material to excitation radiation while the luminescent material is within an electric field of a strength of less than about 50,000 volts per centimeter, thus imposing an image on the luminescent material, and upon subsequent subjection to an electric field of strength at least as great as that of the first-mentioned field, said luminescent material exhibits an emission of visible light as it releases the image.
  • excitation radiation broadly covers exciting stimuli to which the phosphor is initially sensitive, and specifically includes electromagnetic radiation of a Wave length shorter than about 500 millimicrons, e.g., visible blue light, ultraviolet radiation, X-rays, gamma rays and cosmic rays, and also alpha particles, i.e., positively-charged helium nuclei, and beta particles, i.e., negatively-charged particles, e.g., electrons, such as are emitted from radio active substances.
  • Excitation radiation does not include electric fields or electromagnetic radiation of Wave length longer than about 500 millimicrons, such as infrared radiation, since the phosphor utilized in this process is not excitable by these means.
  • a zinc sulfide phosphor containing activating manganese in an amount of from about 0.2% to about 2.0% by Weight of the zinc sulfide is irradiated with, i.e., exposed to the action of, excitation radiation, whereby said phosphor exhibits emission of visible light, and, after said irradiation and after said emission of visible light has essentially ceased, said phosphor is subjected to an electric field, whereby said phosphor again exhibits emission of visible light, the entire process being carried out in the presence of visible light of wave length longer than about 500 millimicrons.
  • an important feature resides in the step of applying an electric field which causes the phosphor to emit the stored image as visible light.
  • This release of visible light may occur once or a number of times, on successive applications of electric fields to the phosphor. It has been found that flashes of light upon release of the stored image will be of greater brightness and of controllable intensity if the applied fields are of successively greater strength, and such is therefore preferred. However, successive applications of fields of equal strength will produce a multiple of image flashes of decreasing intensity and such is contemplated within the scope of the invention, as illustrated by Example X.
  • FIG. 1 is a schematical cross-section of the image storage elernent described in Example XVIII;
  • Example III Examples I and II are repeated, except that each of the phosphor samples is subjected to an electric field of 20,000 volts per centimeter up to the time the field of 50,000 volts per centimeter is applied. Application of the latter field causes each of the phosphor samples to emit a clearly visible yellow-orange light flash, which is of slightly lower intensity than in the preceding examples.
  • Example VIII Example II is repeated except that the ultraviolet light source is replaced with a 10 millicurie strontium-90 source of beta particle radiation placed at a distance of one inch from each sample for 10 seconds. Subsequent application of the electric field causes each phosphor sample to emit a clearly visible yellow-orange light flash.
  • Example XVII Example VI is repeated, wherein the panel containing the mixed phosphor and binder is approximately 6 inches long and 6 inches wide. Each of the panels is exposed for about 30 seconds to unfiltered daylight on the con-- ductive-glass side of the panel through a black stencil design image painted on a transparent glass sheet.
  • Example XIX Thirty grams of luminescent manganese-activated zinc sulfide containing manganese in an amount of 0.2% by weight of the zinc sulfide is stirred by hand into 8 g. of the chlorosulfonated polyethylene solution in toluene of Example XVHI, to which 8 ml. toluene is added.
  • the resultant dispersion is cast on polyethylene terephthalate film 4 mils thick, mm. wide, 10 feet long and having cine perforations along both edges of the film.
  • the coating after drying is about 0.0035 inch thick.
  • the luminescent material in the coated layer emits a clearly visible yelloworange light flash.
  • the image storage tape of this ex ample is illustrated in FIG. 2 of the drawing. Referring to this figure, the polyethylene terephthalate film support 2 has coated thereon the phosphor-binder layer 3.
  • Example XXI Example XVII is repeated using the image storage tape of Example XlX in place of the panels. The observed results are the same as in Example XVII.
  • Example XXII The following ingredients are mixed by ball milling for 2 hours:
  • Firing for 30 minutes or longer at temperatures above 550 C. will produce the luminescent phosphor, which may be of a cubic or hexagonal crystalline structure, with the cubic structure preferably predominating. Firing may be followed by a wash with water, HCl, KCN or other known rinsing solutions, after which the phosphor material can be dried and sieved.
  • the phosphor layer may be self-supporting, as illustrated by Example XVIII and FIG. 1 of the drawing, or it may be joined to a base support as illustrated by Examples XIX, XX and XXVHI and FIGS. 2-4.
  • the upper limit of 50,000 volts per centimeter as the strength of the field applied during exposure of the phosphor to the excitation radiation is selected as a practical limit.
  • Application of the field during exposure limits the intensity of the amount of energy that can be stored and later released. It has been found that above 50,000 volts per centimeter less than about of the energy of the imposed radiation will be stored and released. It will therefore be understood that this upper limit is not critical, but rather represents an approximate practical value in a decreasing scale oi energy storage efficiency.
  • storage elements comprising the phosphor utilized in this invention may be made to receive a picture or stencil image which can be subsequently released as visible light by exposing the storage element to the excitation radiation through the object which it is desired to reproduce.
  • An outstanding advantage of such a feature which is illustrated by Examples XVII and XXII-XXVI, is that the process presents the opportunity to inspect the image for quality upon application of the electric field, followed by printing of the image, e.g., by photopgraphic means, if the image is satisfactory, as illustrated by Example XXVI. If unsatisfactory, the image can of course be promptly erased as described above and the process repeated.
  • a process comprising subjecting a phosphor which comprises a metal sulfide taken from the group consisting of zinc sulfide and zinc cadmium sulfide containing up to about 7 mol percent cadmium based on the total amount of zinc and cadmium present, said phosphor containing manganese in an activating amount of from about 0.2% to about 2.0% by weight of said metal sulfide, through a glue-absorbing and ultraviolet absorbing X-ray transmissive filter dye, said dye being in the same binder as the phosphor material, to X-ray excitation radiation transmitted by said filter element, and after cessation of I 14 a metal sulfide from the group consisting of zinc sulfide and zinc cadmium sulfide containing up to about 7 mol percent cadmium based on the total amount of zinc and cadmium present, said phosphor containing manganese in an activating amount of from about 0.2% to about i 2.0% by weight of said metal

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Luminescent Compositions (AREA)
  • Conversion Of X-Rays Into Visible Images (AREA)
  • Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)
  • Optical Filters (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
US595712A 1956-07-03 1956-07-03 Image storage elements and process Expired - Lifetime US3010043A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
NL109312D NL109312C (enrdf_load_stackoverflow) 1956-07-03
NL218640D NL218640A (enrdf_load_stackoverflow) 1956-07-03
US595712A US3010043A (en) 1956-07-03 1956-07-03 Image storage elements and process
GB20530/57A GB865969A (en) 1956-07-03 1957-06-28 Luminescent image storage elements and the use thereof
DEP18842A DE1120036B (de) 1956-07-03 1957-07-03 Bildspeicherelement und Verfahren zum Speichern eines Bildes unter Verwendung des Bildspeicherelements
CH4793757A CH375754A (de) 1956-07-03 1957-07-03 Bildspeicherelement und Verwendung desselben zur Speicherung eines Bildes und Wiedergabe des gespeicherten Bildes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US595712A US3010043A (en) 1956-07-03 1956-07-03 Image storage elements and process

Publications (1)

Publication Number Publication Date
US3010043A true US3010043A (en) 1961-11-21

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US595712A Expired - Lifetime US3010043A (en) 1956-07-03 1956-07-03 Image storage elements and process

Country Status (5)

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US (1) US3010043A (enrdf_load_stackoverflow)
CH (1) CH375754A (enrdf_load_stackoverflow)
DE (1) DE1120036B (enrdf_load_stackoverflow)
GB (1) GB865969A (enrdf_load_stackoverflow)
NL (2) NL218640A (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3484752A (en) * 1965-04-19 1969-12-16 Univ New York Apparatus for storing and visibly reproducing images using an electroluminescent cell exhibiting persistent internal polarization
US3504214A (en) * 1967-01-13 1970-03-31 Westinghouse Canada Ltd Electroluminescent display device
US3617285A (en) * 1969-10-21 1971-11-02 William Joseph Staudenmayer Light intensifying screens
US4368390A (en) * 1979-07-11 1983-01-11 Fuji Photo Film Co., Ltd. Radiation image storage panel
US4380702A (en) * 1979-07-11 1983-04-19 Fuji Photo Film Co., Ltd. Radiation image storage panel

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5816266A (en) * 1997-02-27 1998-10-06 Cone; Richard R. Elongated toenail file and method of use

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2385615A (en) * 1942-07-01 1945-09-25 Formica Insulation Company Fluorescent sulphide pigment composition
US2478387A (en) * 1944-06-10 1949-08-09 Eastman Kodak Co Phosphorescent materials
US2614082A (en) * 1949-11-30 1952-10-14 Rca Corp Zinc sulfide type phosphors containing magnesium sulfide
US2692948A (en) * 1948-12-29 1954-10-26 Kurt S Lion Radiation responsive circuits
US2711481A (en) * 1954-06-09 1955-06-21 Haloid Co Xeroradiography method and device
FR1117682A (fr) * 1954-01-14 1956-05-25 Philips Nv Dispositif indicateur à organe lumineux, en particulier indicateur d'accord
US2780731A (en) * 1951-08-24 1957-02-05 Westinghouse Electric Corp Controlling the luminosity of a phosphor screen
US2820146A (en) * 1955-02-18 1958-01-14 Du Pont Intensifying screens
US2847386A (en) * 1953-11-27 1958-08-12 Rca Corp Electroluminescent materials
US2863061A (en) * 1954-05-28 1958-12-02 Westinghouse Electric Corp X-ray fluoroscopic device
US2881353A (en) * 1952-01-09 1959-04-07 Hyman A Michlin Producing luminescent images by electroluminescence
US2883556A (en) * 1956-05-31 1959-04-21 Rca Corp Light inverters
US2905830A (en) * 1955-12-07 1959-09-22 Rca Corp Light amplifying device
US2909703A (en) * 1955-09-12 1959-10-20 Gen Electric Radiant energy intensification system and method

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2385615A (en) * 1942-07-01 1945-09-25 Formica Insulation Company Fluorescent sulphide pigment composition
US2478387A (en) * 1944-06-10 1949-08-09 Eastman Kodak Co Phosphorescent materials
US2692948A (en) * 1948-12-29 1954-10-26 Kurt S Lion Radiation responsive circuits
US2614082A (en) * 1949-11-30 1952-10-14 Rca Corp Zinc sulfide type phosphors containing magnesium sulfide
US2780731A (en) * 1951-08-24 1957-02-05 Westinghouse Electric Corp Controlling the luminosity of a phosphor screen
US2881353A (en) * 1952-01-09 1959-04-07 Hyman A Michlin Producing luminescent images by electroluminescence
US2847386A (en) * 1953-11-27 1958-08-12 Rca Corp Electroluminescent materials
FR1117682A (fr) * 1954-01-14 1956-05-25 Philips Nv Dispositif indicateur à organe lumineux, en particulier indicateur d'accord
US2863061A (en) * 1954-05-28 1958-12-02 Westinghouse Electric Corp X-ray fluoroscopic device
US2711481A (en) * 1954-06-09 1955-06-21 Haloid Co Xeroradiography method and device
US2820146A (en) * 1955-02-18 1958-01-14 Du Pont Intensifying screens
US2909703A (en) * 1955-09-12 1959-10-20 Gen Electric Radiant energy intensification system and method
US2905830A (en) * 1955-12-07 1959-09-22 Rca Corp Light amplifying device
US2883556A (en) * 1956-05-31 1959-04-21 Rca Corp Light inverters

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3484752A (en) * 1965-04-19 1969-12-16 Univ New York Apparatus for storing and visibly reproducing images using an electroluminescent cell exhibiting persistent internal polarization
US3504214A (en) * 1967-01-13 1970-03-31 Westinghouse Canada Ltd Electroluminescent display device
US3617285A (en) * 1969-10-21 1971-11-02 William Joseph Staudenmayer Light intensifying screens
US4368390A (en) * 1979-07-11 1983-01-11 Fuji Photo Film Co., Ltd. Radiation image storage panel
US4380702A (en) * 1979-07-11 1983-04-19 Fuji Photo Film Co., Ltd. Radiation image storage panel

Also Published As

Publication number Publication date
NL218640A (enrdf_load_stackoverflow)
CH375754A (de) 1964-03-15
DE1120036B (de) 1961-12-21
NL109312C (enrdf_load_stackoverflow)
GB865969A (en) 1961-04-26

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