US3852632A - Photocathode having an intermediate layer between its carrier and its luminous layer - Google Patents

Photocathode having an intermediate layer between its carrier and its luminous layer Download PDF

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Publication number
US3852632A
US3852632A US00270341A US27034172A US3852632A US 3852632 A US3852632 A US 3852632A US 00270341 A US00270341 A US 00270341A US 27034172 A US27034172 A US 27034172A US 3852632 A US3852632 A US 3852632A
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United States
Prior art keywords
layer
carrier
photo cathode
accordance
luminous
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Expired - Lifetime
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US00270341A
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English (en)
Inventor
K Franz
H Christgau
A Stachowiak
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Siemens AG
Siemens Corp
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Siemens Corp
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Publication date
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/36—Photoelectric screens; Charge-storage screens
    • H01J29/38—Photoelectric screens; Charge-storage screens not using charge storage, e.g. photo-emissive screen, extended cathode
    • H01J29/385—Photocathodes comprising a layer which modified the wave length of impinging radiation

Definitions

  • the carrier layer has an intermediate layer upon which the luminous layer is applied.
  • the luminous layer carries the photo cathode layer.
  • the invention is particularly characterized in that the intermediate layer consists of an elastic substance or form-changing substance.
  • Another object is to provide a luminous layer which will well adhere to the carrier and will not be torn off 7 even after lenghty use, the carrier having an expansion coefficient different from that of the luminous layer.
  • an intermediate layer consisting of .an elastic or plastically changeable 190 to 200 mm. and a curvature depth of about 20 mm.
  • the speed of rotation at the beginning of the coating process should be about 1,500 rotations andshould be lowered gradually. This assures that the coating with the lacquer will extend smoothly to the edge of the calotte without any stripes.
  • the average coating with artificial resin should amount to 0.5 to 5 mg/cm, whereby due to the use of sufficiently raw surfaces and suitable artificial substances producing adequate smoothness the best range lies between 1.0 to 1.5 mglcm It is advantageous during the spraying of lacquer to thicken it by blowing with hot air. This provides in a simple manner that even after the termination of the spraying the layer of lacquer will remain uniformly divided upon the surface of the calotte and will not accumulate in the deepest located central point since viscosity rises to a substantial extent due to the volatilization of the solvent and partial condensation of the resin.
  • the polyimide lacquer After the polyimide lacquer has become a uniform dust-dry coating, a heating takes place for about one hour to 110 to 130C, to eliminate the solvent residues. Finally the polyimide .resin is condensed, i.e., hardened, for about 2 hours at a temperature amounting up to 300C. Obviously, the durations for the hardening and for driving out solvent residues are variable within wide limits, specifically they can be extended without a damaging effect upon the results. I
  • polyimide resin can be substituted by a silicon resin, for example, methylphenyl siloxane in a suitable solvent, such as toluol or perchlorethylene, and can be sprayed according to the described process.
  • a silicon resin for example, methylphenyl siloxane in a suitable solvent, such as toluol or perchlorethylene
  • the solution should have from 5 to 10 percent resin in order to have adequate viscosity
  • sium iodide which-is activated with sodium (CslzNa) substance which permits shiftings between the carrier and the luminous layer.
  • an intermediate layer of sufficient adaptability may consistof polyimide or silicon resin.
  • a well holding layer of polyimide is produced when upon a roughened concave surface of an Al-calotte a partially condensed polyimide is applied in the form of a lacquer dissolved indimethyl formamide in a weight ratio-of 1:1 to 1:2.
  • the partially condensed resin is of Y the type used in the trade.
  • the liquid layer is distributed uniformly by the rotation of the calotte having an upwardly directed concave side, the rotation taking place about a verticalaxis extending through the deepwhich is applied in the required layer thicknessFor use with X-rays which are "usedin medical diagnosis, the
  • thickness should range from 40am to 150um.
  • P16. 1 is a diagrammatic section through image amplifier.
  • FIG. 2 is a partial section through a carrier provided with an intermediate layer and a luminous layer.
  • FIG. 1 shows a vacuum container 1 of glass which. contains inthe known manner the photo cathode 2,
  • the photo cathode 2 made in accordance withthe present invention includes a curved carrier, the calotte f an aluminum sheet having a thickness of 0.5
  • the calotte 7 carries upon its concave side the intermediate layer 8 upon which lies the luminous layer 9 covered by the photo cathode layer 10.
  • the intermediate layer 8 consists of an elastic or plastically variable polyimide or silicon resin and is applied upon a surface 7' of the carrier 7 which was roughened by etching with muriatic acid according to one of the described processes to a thickness of 1.5 mg/cm
  • the making of the luminous layer 9 is carried out by steaming on the luminous substance CslzNa at less than 10 Torr and a speed of lOum/min. At the end the photo cathode layer of caesium and antimony (CsSb) is steamed on and formed.
  • the advantages of the present invention can be also made useful in remote vision technology.
  • a photo cathode comprising a carrier layer, an intermediate layer carried by said carrier layer and consisting of a deformable material, a luminous layer carried by said intermediate layer and a photo cathode layer carried by said luminous layer.
  • a photo cathode in accordance with claim 2 wherein said carrier layer consists of aluminum, said luminous layer consists of caesium iodide/sodium and said intermediate layer is a coating amounting to 0.5 to 5 mg/cm 5.

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  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
US00270341A 1971-07-12 1972-07-10 Photocathode having an intermediate layer between its carrier and its luminous layer Expired - Lifetime US3852632A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712134762 DE2134762B2 (de) 1971-07-12 1971-07-12 Fotokathode

Publications (1)

Publication Number Publication Date
US3852632A true US3852632A (en) 1974-12-03

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US00270341A Expired - Lifetime US3852632A (en) 1971-07-12 1972-07-10 Photocathode having an intermediate layer between its carrier and its luminous layer

Country Status (3)

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US (1) US3852632A (cs)
DE (1) DE2134762B2 (cs)
FR (1) FR2145586B1 (cs)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4982136A (en) * 1987-11-24 1991-01-01 U.S. Philips Corporation X-ray image intensifier tube
US6420829B1 (en) 1998-09-11 2002-07-16 Siemens Aktiengesellschaft Input window of a raidographic image intensifier and method for making same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3300668A (en) * 1962-01-24 1967-01-24 Rauland Corp Image converter tube
US3558893A (en) * 1967-01-30 1971-01-26 Picker Corp X- and gamma-ray sensitive image intensification tube
US3706885A (en) * 1971-01-29 1972-12-19 Gen Electric Photocathode-phosphor imaging system for x-ray camera tubes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3300668A (en) * 1962-01-24 1967-01-24 Rauland Corp Image converter tube
US3558893A (en) * 1967-01-30 1971-01-26 Picker Corp X- and gamma-ray sensitive image intensification tube
US3706885A (en) * 1971-01-29 1972-12-19 Gen Electric Photocathode-phosphor imaging system for x-ray camera tubes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4982136A (en) * 1987-11-24 1991-01-01 U.S. Philips Corporation X-ray image intensifier tube
US6420829B1 (en) 1998-09-11 2002-07-16 Siemens Aktiengesellschaft Input window of a raidographic image intensifier and method for making same
US20020109459A1 (en) * 1998-09-11 2002-08-15 Heinrich Diepers Input window of a radiographic image intensifier and method for making same

Also Published As

Publication number Publication date
FR2145586B1 (cs) 1976-08-13
DE2134762B2 (de) 1977-12-01
FR2145586A1 (cs) 1973-02-23
DE2134762A1 (de) 1973-01-25

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