US3772551A - Cathode ray tube system - Google Patents

Cathode ray tube system Download PDF

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Publication number
US3772551A
US3772551A US00204073A US3772551DA US3772551A US 3772551 A US3772551 A US 3772551A US 00204073 A US00204073 A US 00204073A US 3772551D A US3772551D A US 3772551DA US 3772551 A US3772551 A US 3772551A
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US
United States
Prior art keywords
microchannel plate
electrons
fiber optic
cathode ray
phosphor screen
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
US00204073A
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English (en)
Inventor
J Grant
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.)
TDK Micronas GmbH
ITT Inc
Original Assignee
Deutsche ITT Industries GmbH
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 Deutsche ITT Industries GmbH filed Critical Deutsche ITT Industries GmbH
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Publication of US3772551A publication Critical patent/US3772551A/en
Assigned to ITT CORPORATION reassignment ITT CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: INTERNATIONAL TELEPHONE AND TELEGRAPH CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J43/00—Secondary-emission tubes; Electron-multiplier tubes
    • H01J43/04—Electron multipliers
    • H01J43/06—Electrode arrangements
    • H01J43/18—Electrode arrangements using essentially more than one dynode
    • H01J43/24—Dynodes having potential gradient along their surfaces
    • H01J43/246—Microchannel plates [MCP]
    • 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
    • H01J29/023—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof secondary-electron emitting electrode arrangements
    • 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
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/89—Optical or photographic arrangements structurally combined or co-operating with the vessel
    • H01J29/892—Optical or photographic arrangements structurally combined or co-operating with the vessel using fibre optics
    • 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

Definitions

  • ABSTRACT A cathode ray tube system having a source of elec- P an P $Ph9.9 ..-.A.WE EIQFPQIQQLPE having secondary emissive surfaces is positioned in the cathode ray tube so thatthe source ot electrons is directed towards the microchannel plate. Output electrons from the microchannel plate are directed towards the reduced cross-sectional end of a magnification tube interposed between the microchannel plate and the phosphor screen which is at the enlarged end of the magnification tube. The resulting structure allows a reduced cross-sectional area microchannelplate to be used in the cathode ray tube system.
  • the system may bemanufactured of two envelopes with the first envelope containing the source of electrons which is directed to the microchannel plate. Electrons are then directed from the microchannel plate towards a phosphor screen adjacent thereto and light energy from the phosphor screen transmitted to a fiber optic structure at the end of the first envelope. A second fiber optic structure in the second envelope is adjacent the first fiber optic structure. Light emanating intothe fiber optic structure then appears at a photosensitive device adjacent the second fiber optic structure. The photosensitive device emits electrons into a magnitication tube in the second envelope which are directed towards a phosphor screen in the other end of the second envelope.
  • the invention relates in general to cathode ray tube systems and more particularly to electro-optical brightener intensifiers for use in a cathode ray tube.
  • the output brightness display of a fast response tube is determined by the beam current density falling on the phosphor and the energy at which that beam is delivered.
  • the density of the electron beam is normally determined by the perveance, P, of the electron gun.
  • the perveance is normally defined by the formula P I/V where:
  • I is the electron gun beam current
  • V is the accelerating voltage
  • a cathode ray gun 12 which is positioned at one end 14 of an evacuated envelope 16. Electrons emitted from the gun 12 are deflected by means of a magnetic deflection coil 18 so that they will travel towards a window 22 having a phosphor surface 24 thereon.
  • microchannel plate 26 Positioned adjacent the phosphor surface 24, between the gun 12 and the surface 24 is a microchannel plate 26.
  • the microchannel plate is of conventional design and may be of the type described in U.S. Pat. No. 3,260,876.
  • the electron beam scans the microchannel plate and the electrons are amplified by the microchannel plate.
  • the microchannel plate is positioned sufficiently close to the phosphor surface 24 so that as the amplified electrons leave the microchannel plate, they are proximity focused on the phosphor surface.
  • the microchannel plate and the surface 24 are normally biased in the manner taught by the aforementioned patent.
  • the electron beam is amplified by the microchannel plate, and the beam density required to produce the desired display brightness need not be as great as when the microchannel plate is not utilized.
  • FIG. 2 there is shown an alternative embodiment of a cathode ray oscilloscope containing a microchannel plate.
  • the microchannel plate 32 is much smaller than the phosphor coated window 34 of an envelope 36, and is positioned closer to the deflection coil 38.
  • FIG. 3 there is shown an alternative embodiment of the device of FIG. 2, wherein a pair of envelopes is joined to form a cathode ray tube system.
  • the first envelope 62 contains a cathode ray gun 64 at one end of the tube.
  • the electron beam from the gun is deflected by magnetic deflection coils 66 with the electron beam point of impact being a microchannel plate 68.
  • the amplified electrons then impinge on a phosphor screen 72 positioned on one side of a fiber optic output window 74.
  • the other side of the window 74 has formed thereon, the end surface 76 of the envelope 62.
  • the envelope is generally cylindrical in shape and the microchannel plate 68 and fiber optic output window 74 both are slightly smaller than the inner dimension of the envelope 62.
  • a second envelope 82 has an input end 84 of approximately equal cross-sectional dimensions as the envelope 62 and a diverging output envelope cone 86 extending therefrom.
  • the input end 84 of the envelope 82 abuts the end surface 76 of the envelope 62 and contains a fiber optic input window 88 similar to the window 74 in envelope 62.
  • the window 88 contains a photocathode 92 at its end adjacent the cone 86.
  • a phosphor surface 94 may be coated thereon.
  • a focusing cone 96 of the Delft magnification tube type as described in FIG. 2 is mounted on the envelope cone portion 86.
  • electrons from the gun are amplified by the microchannel plate 68 and impinge on the phosphor screen 72.
  • Light from the screen 72 is transmitted through the fiber optic output window 74 which normally may be formed to a plurality of light guiding fibers.
  • the light signal is then transmitted to the window 88.
  • the light from the window 88 impinges on the photocathode 92.
  • Photocathode 92 in turn emits electrons which enter the focusing cone 96 and a magnified output appears on the phosphor screen 94. It should be understood, of course, the elements of the system must be correctly biased so as to enable the electrons to travel from the gun 64 to the screen 94.
  • a cathode ray tube system comprising:
  • microchannel plate having secondary-emissive surfaces in the channels for multiplying electrons from said source, said microchannel plate being positioned within the other end of said first section;
  • electromagnetic deflection means around said first section between said electron source and microchannel plate for scanning electrons across said microchannel plate
  • the cathode ray tube system in accordance with claim 1 further comprising fiber optic means adjacent said other end of said first section interposed between said microchannel plate and said other end, a second phosphor screen on one side of said fiber optic means facing said microchannel plate, and a photoemissive surface on the other side of said fiber optic means at said other end.
  • magnification tube includes two adjacent longitudinal tubular envelopes having adjacent ends of reduced cross-sectional areas
  • said fiber optic means includes a first and second fiber optic device positioned adjacent each other in respective adjacent ends of said tubular envelopes, said first envelope containing said source of electrons, said microchannel plate, said second phosphor screen and said first fiber device, and said second envelope including said second fiber optic device and said photoemissive surface in said reduced cross-sectional area and said focusing means and said first phosphor screen in said enlarged area.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
US00204073A 1971-12-02 1971-12-02 Cathode ray tube system Expired - Lifetime US3772551A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US20407371A 1971-12-02 1971-12-02

Publications (1)

Publication Number Publication Date
US3772551A true US3772551A (en) 1973-11-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00204073A Expired - Lifetime US3772551A (en) 1971-12-02 1971-12-02 Cathode ray tube system

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US (1) US3772551A (OSRAM)
FR (1) FR2165907B3 (OSRAM)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3904923A (en) * 1974-01-14 1975-09-09 Zenith Radio Corp Cathodo-luminescent display panel
US4293790A (en) * 1975-12-10 1981-10-06 Robert Bosch Gmbh Image converter having cylindrical housing and photocathode separated by spacing element from luminescent screen on frustrum
US5134337A (en) * 1990-01-09 1992-07-28 Tektronix, Inc. Projection lens assembly for planar electron source
US5729244A (en) * 1995-04-04 1998-03-17 Lockwood; Harry F. Field emission device with microchannel gain element
US6522061B1 (en) 1995-04-04 2003-02-18 Harry F. Lockwood Field emission device with microchannel gain element

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3249784A (en) * 1962-11-14 1966-05-03 Fairchild Camera Instr Co Direct-view signal-storage tube with image expansion means between storage grid and viewing screen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3249784A (en) * 1962-11-14 1966-05-03 Fairchild Camera Instr Co Direct-view signal-storage tube with image expansion means between storage grid and viewing screen

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3904923A (en) * 1974-01-14 1975-09-09 Zenith Radio Corp Cathodo-luminescent display panel
US4293790A (en) * 1975-12-10 1981-10-06 Robert Bosch Gmbh Image converter having cylindrical housing and photocathode separated by spacing element from luminescent screen on frustrum
US5134337A (en) * 1990-01-09 1992-07-28 Tektronix, Inc. Projection lens assembly for planar electron source
US5729244A (en) * 1995-04-04 1998-03-17 Lockwood; Harry F. Field emission device with microchannel gain element
US6522061B1 (en) 1995-04-04 2003-02-18 Harry F. Lockwood Field emission device with microchannel gain element

Also Published As

Publication number Publication date
FR2165907B3 (OSRAM) 1976-01-09
FR2165907A1 (OSRAM) 1973-08-10

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Legal Events

Date Code Title Description
AS Assignment

Owner name: ITT CORPORATION

Free format text: CHANGE OF NAME;ASSIGNOR:INTERNATIONAL TELEPHONE AND TELEGRAPH CORPORATION;REEL/FRAME:004389/0606

Effective date: 19831122