US2931937A - Storage tubes - Google Patents

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Publication number
US2931937A
US2931937A US589450A US58945056A US2931937A US 2931937 A US2931937 A US 2931937A US 589450 A US589450 A US 589450A US 58945056 A US58945056 A US 58945056A US 2931937 A US2931937 A US 2931937A
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electrode
target
spot
focusing
electrodes
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Expired - Lifetime
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US589450A
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Dufour Charles
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Thales SA
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CSF Compagnie Generale de Telegraphie sans Fil SA
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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
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/58—Arrangements for focusing or reflecting ray or beam
    • H01J29/62—Electrostatic lenses
    • H01J29/622—Electrostatic lenses producing fields exhibiting symmetry of revolution
    • H01J29/624—Electrostatic lenses producing fields exhibiting symmetry of revolution co-operating with or closely associated to an electron gun
    • 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
    • H01J31/58—Tubes for storage of image or information pattern or for conversion of definition of television or like images, i.e. having electrical input and electrical output
    • H01J31/60—Tubes for storage of image or information pattern or for conversion of definition of television or like images, i.e. having electrical input and electrical output having means for deflecting, either selectively or sequentially, an electron ray on to separate surface elements of the screen

Definitions

  • the present invention relates to storage tubes, and more particularly to guns adapted to be used in such tubes.
  • the focusing electrodes 6 and 7 are brought to a positive voltage of 800 volts through contact 91..
  • switch 9 connects electrode 8 to contact 91, the voltage of electrode 8 is also 800 volts.
  • the path of the beam projected by the cathode 3 is shown in full lines at 13 and its spot on the target 11 is extremely fine. 'Ihebeam shown in full lines represents only a portion of the total electrons of the beam emitted from the cathode 3, this portion being that 0-.
  • the storage tube according to the invention is of the type comprising in a vacuum tight envelope, at least one gun and one target.
  • the gun comprises a cathode for emitting an electron beam and means for controlling this -beam in order that the impact thereof on the target should produce, either a fine spot or on the contrary, a spot extending over a certain area in accordance to what is needed.
  • the fine spot beam is used for normal reading, and the same beam, when providing a wider spot, is used for erasing.
  • the storage tube of the invention comprises,
  • the gun also comprises, in succession: a first accelerating anode 4, having the shape of a disc with a central opening; three focusing cylindrical electrodes 6, 8 and 7, aligned in succession but spaced from each other, the electrode 7 being farthest of the three from the cathode and including a disk portion having a central axial opening of smaller diameter than the cylindrical electrode portion; a second accelerating anode 5, having a cylindrical shape; and two pairs of deflection, plates 14, 15 and 16, 17.
  • the portion of the memory tube shown is limited by a target 11.
  • the above elements build up the reading and erasing gun of the tube.
  • the writing gun is usually located on the other side of the target 11 and is not shown in the drawing.
  • a battery 18 is connected to the terminals of a potentiometer 10 to supply the necessary voltages to the various electrodes.
  • a switch 9 having two contacts 91 and 92 enables .two diflferent voltages to be applied to the focussing electrode 8. Electrodes 6 and 7 are also connected to contact 91. For a better understanding of the invention, a numerical example will be given hereinafter.
  • the Wehnelt cylinder 2 is brought to a negative potential of about 10 volts with respect to cathode 3.
  • the accelerating anodes 4 and 5 are respectively brought to 9 connects electrode 8 to contact 92, the voltage of electrode 8 is 100 volts.
  • Electrodes 6,7, 8 then function as a composite electro-static lens and the path of thebeam is then substantially as shown in dotted lines at 12, with the spot on target 11 wider then previously shown.
  • the focusing system comprising electrodes 6, 8 and 7 controls the angular resolution of the beam which is more or less spread near and upon the target in accordance with the voltage applied to electrode 8.
  • the fine beam spot is used for reading information stored on screen 11, and the wide beam spot for erasing the information left on screen 11 after reading.
  • the beam is guided in' the tube under the influence of the same accelerating potentials, but the course of the beam electrons are determined by the potential of the electrode 8.
  • a storage tube including a target electrode, an elec-v tron gun adapted to emit an electron beam toward said opening disposed between said cathode and said target so that in one mode of operation only a part of the emitted beamed electrons traverse said opening and reach said target in a fine spot, electrically energized means between saidcathode and said disc for converging said beam during another mode of operation so that substantially all of the emitted beamed electrons traverse said opening and impinge upon said target in a wide spot, and means for switching on and off said converging means in accordance with the respective modes of operation, said electron gun including accelerating electrode means for said beam .providing substantially the same electron velocities of target impinging electrons during both modes of operation.
  • a storage tube comprising inside a vacuum tight enclosure, a target, an electron gun adapted to produce an electron beam directed toward said target, said gun including an electron emissive cathode, a control electrode, a first accelerating anode having the shape of a disc with a central opening, two cylindrical electrically interconnected focusing electrodes for controlling angular resolution of said beam, a second accelerating anode, an additional cylindrical focusing electrode positioned between said two focusing electrodes, and means for switching said additional focusing electrode from a first to a second potential with respect to said cathode, said first potential being so chosen to permit said beam to diverge in passing through the additional focusing electrode, whereby only part of the electrons of said beam traverse the focusing electrodes and said second accelerating anode to reach the target in a fine spot, said second potential 3 being so chosen to produce a converging effect on the beamby the additional focusing electrode, whereby substantially all of the electrons of said beam traverse the focusing electrodes ,and said second accelerating anode
  • a storage tube comprising inside a vacuum :tight genclosure, a target, an electron gun adapted to produce an electron beam directed toward said target,l said -gun including an electron emissivecathode, a control ielec-' trode, .a first accelerating anode having theshape of a disc with a central aperture through which said fbearn passes, two cylindricalrelectricallyinterconnected focusing lelectro'des, one of said focusing electrodes including a fdisc with a central opening, a second-accelerating anode, an additional cylindrical focusing electrode positioned ,joetween said twoffocusing electrodes, and means' for switching said additional focusing electrode *fr or'n a-first ,to a second potential with respect to -said cathode, said ,Qfirst potential'being so chosen as to leave said beam sub stan tially'unaffectcd'by said additional electrode, whereby 20 ,saidbeam passed through said.
  • aperture diverges toward said second accelerating electrode and only apart of the beam traverses said central opening and reaches said aaaiaw target in a fine spot, while said second potential is so chosen that aconverging effect-is produced onsaidbeam by said additional electrode, whereby substantially all of the electrons of said beam passed through said aperture traverse said central opening and impinge upon said target in a wide spot.

Description

April 5, 1960 c. DUFOUR STORAGE'TUBES Filed June 5. 1956 INVENTOR, CHARLES DUFOUR BY flJ 7/2 ATTORNEY The present invention relates to storage tubes, and more particularly to guns adapted to be used in such tubes.
I States Patent lcfi Patented Apr. 5, 1960 positive voltages of 300 and 1,500 volts. The focusing electrodes 6 and 7 are brought to a positive voltage of 800 volts through contact 91.. When switch 9 connects electrode 8 to contact 91, the voltage of electrode 8 is also 800 volts. The path of the beam projected by the cathode 3 is shown in full lines at 13 and its spot on the target 11 is extremely fine. 'Ihebeam shown in full lines represents only a portion of the total electrons of the beam emitted from the cathode 3, this portion being that 0-.
' trodes.
and remains divergent in passing through the electrode 8 which traverses all of the focusing and accelerating elec- The beam represented by solid lines is unaffected when switch 9 is connected to contact 91. When switch It -is current practice toinake use of an electron beam for reading information stored or written by any suitable process on the target of a storage tube. The reading of the information will usually cause only a partial erasure thereof. A fraction of information is still left, which normally has to be completely erased before proceeding to a new writing. This erasure is frequently elfected by means of an additional scanning performed by the reading beam. However, the spot of this beam on the target is extremely hue and the time required for a complete erasure is considerable.
It is an object of the present invention to avoid this difi'iculty.
The storage tube according to the invention is of the type comprising in a vacuum tight envelope, at least one gun and one target. The gun comprises a cathode for emitting an electron beam and means for controlling this -beam in order that the impact thereof on the target should produce, either a fine spot or on the contrary, a spot extending over a certain area in accordance to what is needed. The fine spot beam is used for normal reading, and the same beam, when providing a wider spot, is used for erasing.
The invention will be better understood from the ensuing description taken in connection with the appended drawing, diagrammatically representing, by way of example, a portion of a storage tube, showing the improvements according to the invention. W
As shown, the storage tube of the invention comprises,
ainside an evacuated envelope 1, an electron gun having a cathode 3, a Wehnelt cylinder 2. The gun also comprises, in succession: a first accelerating anode 4, having the shape of a disc with a central opening; three focusing cylindrical electrodes 6, 8 and 7, aligned in succession but spaced from each other, the electrode 7 being farthest of the three from the cathode and including a disk portion having a central axial opening of smaller diameter than the cylindrical electrode portion; a second accelerating anode 5, having a cylindrical shape; and two pairs of deflection, plates 14, 15 and 16, 17. The portion of the memory tube shown is limited by a target 11.
The above elements build up the reading and erasing gun of the tube. The writing gun is usually located on the other side of the target 11 and is not shown in the drawing. A battery 18 is connected to the terminals of a potentiometer 10 to supply the necessary voltages to the various electrodes.
According to the invention, a switch 9 having two contacts 91 and 92 enables .two diflferent voltages to be applied to the focussing electrode 8. Electrodes 6 and 7 are also connected to contact 91. For a better understanding of the invention, a numerical example will be given hereinafter.
The Wehnelt cylinder 2 is brought to a negative potential of about 10 volts with respect to cathode 3. The accelerating anodes 4 and 5 are respectively brought to 9 connects electrode 8 to contact 92, the voltage of electrode 8 is 100 volts. Electrodes 6,7, 8 then function as a composite electro-static lens and the path of thebeam is then substantially as shown in dotted lines at 12, with the spot on target 11 wider then previously shown. The
change in voltage applied to electrode 8 results in the divergent beam being made' convergent so that substantially all of the electrons pass through the central opening of the focusing electrode 7. Thus the focusing system comprising electrodes 6, 8 and 7 controls the angular resolution of the beam which is more or less spread near and upon the target in accordance with the voltage applied to electrode 8. As explained above, the fine beam spot is used for reading information stored on screen 11, and the wide beam spot for erasing the information left on screen 11 after reading. In both of the foregoing reading and erasing modes of operation, the beam is guided in' the tube under the influence of the same accelerating potentials, but the course of the beam electrons are determined by the potential of the electrode 8.
It is of course to be understood that the invention is not limited to the embodiment described, nor to the numerical values given, which are by way of example only.
What I claim is:
1. A storage tube including a target electrode, an elec-v tron gun adapted to emit an electron beam toward said opening disposed between said cathode and said target so that in one mode of operation only a part of the emitted beamed electrons traverse said opening and reach said target in a fine spot, electrically energized means between saidcathode and said disc for converging said beam during another mode of operation so that substantially all of the emitted beamed electrons traverse said opening and impinge upon said target in a wide spot, and means for switching on and off said converging means in accordance with the respective modes of operation, said electron gun including accelerating electrode means for said beam .providing substantially the same electron velocities of target impinging electrons during both modes of operation.
2. A storage tube comprising inside a vacuum tight enclosure, a target, an electron gun adapted to produce an electron beam directed toward said target, said gun including an electron emissive cathode, a control electrode, a first accelerating anode having the shape of a disc with a central opening, two cylindrical electrically interconnected focusing electrodes for controlling angular resolution of said beam, a second accelerating anode, an additional cylindrical focusing electrode positioned between said two focusing electrodes, and means for switching said additional focusing electrode from a first to a second potential with respect to said cathode, said first potential being so chosen to permit said beam to diverge in passing through the additional focusing electrode, whereby only part of the electrons of said beam traverse the focusing electrodes and said second accelerating anode to reach the target in a fine spot, said second potential 3 being so chosen to produce a converging effect on the beamby the additional focusing electrode, whereby substantially all of the electrons of said beam traverse the focusing electrodes ,and said second accelerating anode an'djimpin ge upon said targetinawide spot.
'3. A storage tube comprising inside a vacuum :tight genclosure, a target, an electron gun adapted to produce an electron beam directed toward said target,l said -gun including an electron emissivecathode, a control ielec-' trode, .a first accelerating anode having theshape of a disc with a central aperture through which said fbearn passes, two cylindricalrelectricallyinterconnected focusing lelectro'des, one of said focusing electrodes including a fdisc with a central opening, a second-accelerating anode, an additional cylindrical focusing electrode positioned ,joetween said twoffocusing electrodes, and means' for switching said additional focusing electrode *fr or'n a-first ,to a second potential with respect to -said cathode, said ,Qfirst potential'being so chosen as to leave said beam sub stan tially'unaffectcd'by said additional electrode, whereby 20 ,saidbeam passed through said. aperture diverges toward said second accelerating electrode and only apart of the beam traverses said central opening and reaches said aaaiaw target in a fine spot, while said second potential is so chosen that aconverging effect-is produced onsaidbeam by said additional electrode, whereby substantially all of the electrons of said beam passed through said aperture traverse said central opening and impinge upon said target in a wide spot.
Referencesfited ingthefile of this patent UNITED S TATESVPATENT S OIHER BEEERENCES
US589450A 1955-06-16 1956-06-05 Storage tubes Expired - Lifetime US2931937A (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3458752A (en) * 1965-04-02 1969-07-29 Burroughs Corp Method and apparatus for improving the performance of electrostatic printing tubes
US3470414A (en) * 1968-05-27 1969-09-30 Westinghouse Electric Corp Direct view storage system
US3569770A (en) * 1968-05-28 1971-03-09 Us Navy Selective fast erase dark trace scan converter
US3798478A (en) * 1972-09-14 1974-03-19 Gte Sylvania Inc Multibeam cathode ray tube having a common beam limiting aperture therein
JPS5065170A (en) * 1973-10-11 1975-06-02
US3995194A (en) * 1974-08-02 1976-11-30 Zenith Radio Corporation Electron gun having an extended field electrostatic focus lens
US4058753A (en) * 1974-08-02 1977-11-15 Zenith Radio Corporation Electron gun having an extended field beam focusing and converging lens
FR2457014A2 (en) * 1979-05-14 1980-12-12 Tektronix Inc ELECTRON DISCHARGE DEVICE WITH DYNAMIC FOCUS CORRECTION
US4266248A (en) * 1977-10-18 1981-05-05 U.S. Philips Corporation Device having a camera tube
US4302612A (en) * 1976-07-15 1981-11-24 Polaroid Corporation Synthesis of perfluorodialdehydes

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2276359A (en) * 1938-09-10 1942-03-17 Ardenne Manfred Von Television image projection device
US2532339A (en) * 1946-05-09 1950-12-05 Columbia Broadcasting Syst Inc Cathode-ray tube receiving system
US2535817A (en) * 1942-09-14 1950-12-26 Nat Union Radio Corp Electrooptical dark trace storage tube
US2728872A (en) * 1953-10-23 1955-12-27 Hughes Aircraft Co Direct-viewing storage tube with character writing electron gun
US2777971A (en) * 1948-05-22 1957-01-15 Ibm Information storage means
US2817042A (en) * 1951-01-09 1957-12-17 Nat Res Dev Electrostatic storage of information
US2863088A (en) * 1952-04-25 1958-12-02 Csf Electron signal storage tubes
US2884557A (en) * 1954-07-01 1959-04-28 Ibm Apparatus, including an electrostatic type storage tube, for storing digital information

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2454652A (en) * 1943-06-26 1948-11-23 Rca Corp Cathode-ray storage tube
DE928480C (en) * 1953-01-22 1955-06-02 Loewe Opta Ag Concentration device for electron beam tubes with static concentrating means

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2276359A (en) * 1938-09-10 1942-03-17 Ardenne Manfred Von Television image projection device
US2535817A (en) * 1942-09-14 1950-12-26 Nat Union Radio Corp Electrooptical dark trace storage tube
US2532339A (en) * 1946-05-09 1950-12-05 Columbia Broadcasting Syst Inc Cathode-ray tube receiving system
US2777971A (en) * 1948-05-22 1957-01-15 Ibm Information storage means
US2817042A (en) * 1951-01-09 1957-12-17 Nat Res Dev Electrostatic storage of information
US2863088A (en) * 1952-04-25 1958-12-02 Csf Electron signal storage tubes
US2728872A (en) * 1953-10-23 1955-12-27 Hughes Aircraft Co Direct-viewing storage tube with character writing electron gun
US2884557A (en) * 1954-07-01 1959-04-28 Ibm Apparatus, including an electrostatic type storage tube, for storing digital information

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3458752A (en) * 1965-04-02 1969-07-29 Burroughs Corp Method and apparatus for improving the performance of electrostatic printing tubes
US3470414A (en) * 1968-05-27 1969-09-30 Westinghouse Electric Corp Direct view storage system
US3569770A (en) * 1968-05-28 1971-03-09 Us Navy Selective fast erase dark trace scan converter
US3798478A (en) * 1972-09-14 1974-03-19 Gte Sylvania Inc Multibeam cathode ray tube having a common beam limiting aperture therein
JPS5065170A (en) * 1973-10-11 1975-06-02
JPS5444193B2 (en) * 1973-10-11 1979-12-24
US3995194A (en) * 1974-08-02 1976-11-30 Zenith Radio Corporation Electron gun having an extended field electrostatic focus lens
US4058753A (en) * 1974-08-02 1977-11-15 Zenith Radio Corporation Electron gun having an extended field beam focusing and converging lens
US4302612A (en) * 1976-07-15 1981-11-24 Polaroid Corporation Synthesis of perfluorodialdehydes
US4266248A (en) * 1977-10-18 1981-05-05 U.S. Philips Corporation Device having a camera tube
US4277722A (en) * 1978-02-15 1981-07-07 Tektronix, Inc. Cathode ray tube having low voltage focus and dynamic correction
FR2457014A2 (en) * 1979-05-14 1980-12-12 Tektronix Inc ELECTRON DISCHARGE DEVICE WITH DYNAMIC FOCUS CORRECTION

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DE1119421B (en) 1961-12-14
FR1127986A (en) 1956-12-28

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