GB1226725A - - Google Patents

Info

Publication number
GB1226725A
GB1226725A GB1226725DA GB1226725A GB 1226725 A GB1226725 A GB 1226725A GB 1226725D A GB1226725D A GB 1226725DA GB 1226725 A GB1226725 A GB 1226725A
Authority
GB
United Kingdom
Prior art keywords
image
screen
cathode
intensifier
layer
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
Application number
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 filed Critical
Publication of GB1226725A publication Critical patent/GB1226725A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H01J31/50—Image-conversion or image-amplification tubes, i.e. having optical, X-ray, or analogous input, and optical output
    • H01J31/501—Image-conversion or image-amplification tubes, i.e. having optical, X-ray, or analogous input, and optical output with an electrostatic electron optic system
    • H01J31/502—Image-conversion or image-amplification tubes, i.e. having optical, X-ray, or analogous input, and optical output with an electrostatic electron optic system with means to interrupt the beam, e.g. shutter for high speed photography
    • 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
    • H01J29/18—Luminescent screens
    • H01J29/187—Luminescent screens screens with more than one luminescent material (as mixtures for the treatment of the screens)
    • 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
    • H01J31/50—Image-conversion or image-amplification tubes, i.e. having optical, X-ray, or analogous input, and optical output
    • H01J31/508—Multistage converters

Landscapes

  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)

Abstract

1,226,725. Image intensifier tubes. RCA CORPORATION. 23 May, 1969 [5 July, 1968], No. 26556/69. Heading HID. [Also in Divisions H3-H5] The fluorescent screen of an image intensifier tube is formed in two parts, one having a relatively fast rise and decay time but low efficiency and the other having relatively slow rise and decay times but a high efficiency; and means are provided for deflecting the electron image from one part to the other. Fig. 1 shows an intensifier adapted for viewing a tumour impregnated with a radio-active isotope, and includes a converter 78 of sodium iodide adapted to convert gamma rays into visible light which excites the photo-cathode 22. The image formed by the cathode is focused by a lens 32 on to an intensifier structure comprising a mica support 28 carrying on one side a fluorescent screen 26 covered by aluminium 27, and on the other side a photo-cathode 30. The output screen comprises two semicircular luminescent areas 40, 42 separated by a narrow diametral strip 44 and covered by an aluminium layer 46, the image appearing on one or other area according to the voltage applied to the deflection plates 52, 54. Normally the highspeed viewing screen 42 is observed, and when this displays useful information (instead of noise or interference) the switch 60 is actuated to transfer the image to the high efficiency screen 40 for recording on photographic apparatus (not shown). The switching may be done automatically by discriminator circuits responsive to the higher intensity display caused by the gamma rays to be observed. The layer 40 may be of zinc activated zinc sulphide, and the layer 42 of calcium magnesium silicate with cerium and lithium activators which decays to 10% brightness in 0À12 microsecond. The faceplate 14 should be as thin as possible, preferably about 0À080 inch, to avoid distortion of light passing through it, and the envelope may be formed in two halves terminating in respective metal ring flanges 18, 20 which are welded together.
GB1226725D 1968-07-05 1969-05-23 Expired GB1226725A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US74268568A 1968-07-05 1968-07-05

Publications (1)

Publication Number Publication Date
GB1226725A true GB1226725A (en) 1971-03-31

Family

ID=24985816

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1226725D Expired GB1226725A (en) 1968-07-05 1969-05-23

Country Status (4)

Country Link
DE (1) DE1934058A1 (en)
FR (1) FR2012365A1 (en)
GB (1) GB1226725A (en)
NL (1) NL6910312A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7604144A (en) * 1976-04-20 1977-10-24 Optische Ind De Oude Delft Nv METHOD OF SEALING AN IMAGE AMPLIFIER TUBE AND IMAGE AMPLIFIER TUBE OBTAINED ACCORDING TO THIS METHOD.

Also Published As

Publication number Publication date
FR2012365A1 (en) 1970-03-20
DE1934058A1 (en) 1970-08-13
NL6910312A (en) 1970-01-07

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees