US3155869A - Storage tube with collectorbackplate unitary target - Google Patents

Storage tube with collectorbackplate unitary target Download PDF

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Publication number
US3155869A
US3155869A US87625A US8762561A US3155869A US 3155869 A US3155869 A US 3155869A US 87625 A US87625 A US 87625A US 8762561 A US8762561 A US 8762561A US 3155869 A US3155869 A US 3155869A
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US
United States
Prior art keywords
potential
gun
storage electrode
writing
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
US87625A
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English (en)
Inventor
Firmin Jervois Campbell
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.)
Teledyne UK Ltd
Original Assignee
English Electric Valve Co Ltd
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 English Electric Valve Co Ltd filed Critical English Electric Valve Co Ltd
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Publication of US3155869A publication Critical patent/US3155869A/en
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    • 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
    • H01J31/18—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen with image written by a ray or beam on a grid-like charge-accumulating screen, and with a ray or beam passing through and influenced by this screen before striking the luminescent screen, e.g. direct-view storage tube

Definitions

  • This invention relates to signal storage arrangements and more particularly to such arrangements of the kind employing signal storage tubes of the so-called bi-stable or black and white type, i.e. tubes in which the stored information is representative of either signal or no signal conditions but is not representative of other signal variations such as signal amplitude.
  • Signal storage arrangements in accordance with the present invention may, although this is not a necessity, employ electron discharge storage tubes of present known construction. Nevertheless, as will be seen later, arrangements in accordance with this invention are such that the discharge tubes used therein do not operate in the usual known manner.
  • a signal storage arrangement of the kind referred to comprises an electron discharge tube having a fluorescent screen, a storage electrode arranged parallel to and spaced from said screen, said storage electrode comprising a metallic grid or mesh having deposited thereon, on the side remote from said screen, a layer of insulating material, a writing electron flood electron gun; means for applying to gun and said screen high potentials which are negative and positive, respectively, in relation to the flood gun cathode potential; means for stabilising the potential of said insulating layer at the flood gun cathode potential; means for subsequently applying to said metallic grid or mesh a potential which, in relation to the flood gun cathode potential, is positive and of a value exceeding the so-called first secondary emission crossover of said insulating layer; and means for switching on said writing gun in correspondence with signals to be stored, the whole arrangement being such that in operation the storage electrode insulating layer is stabilised,.before Writing, substantially at the potential of the flood gun cathode, and during writing and storage the storage electrode metallic grid or mesh is held at said
  • writing gun will increase in potential and will be stabilised at substantially the potential of said metallic grid or mesh, and whereby electrons from said flood gun pass through the storage electrode at said bombarded portions and impinge on said fluorescent screen.
  • the axis of the writing gun is perpendicular to the surface of said storage electrode.
  • the tube has a further grid or mesh arranged parallel to but spaced from the storage electrode on the side thereof remote from the fluorescent screen, and means are provided for applying thereto a potential of such value that in operation the further grid or mesh will collect gas ions.
  • the storage electrode grid or mesh may conveniently be a woven grid or mesh.
  • the discharge tube therein shown has an envelope 1, on one end face of which is deposited a fluorescent screen 2, shown as a thickened line,
  • a storage electrode 3 Parallel to the screen 2 and spaced at small distance therefrom is a storage electrode 3 comprising a metallic grid or mesh having deposited thereon, on the side remote from the fluorescent screen, a layer of insulating material which lies only on the wires of the metallic grid or mesh and does not fill its interstices. Spaced from the storage electrode on the side remote from the fluorescent screen is an ion collecting electrode in the form of a metallic mesh or grid 4.
  • the discharge tube has two electron guns, a writing gun 5 arranged on the axis of the storage electrode 3 and a flood gun 6 arranged at an angle to the storage electrode axis.
  • Each of these electron guns may be constructed in well known manner, the writing gun 5 being arranged to produce a Writing electron beam which may be switched on or off in accordance with. signals applied thereto, and the flood gun 6 being arranged to produce a continuous flooding electron beam which is substantially equally distributed over the surface of the storage electrode 3.
  • Each of the electrodes 2, 3 and 4 and the cathodes of each of the two electron guns are connected to suitable sources of potential which are indicated conventionally in the drawing as comprising the batteries '7 and 8 and the potentiometers 9 and 1d.
  • the arrangement is such that, regarding the flood gun cathode as at earth or zero volts, the writing gun cathode is at a large negative potential, the fluorescent screen 2 is at a large positive potential, the ion collecting grid or mesh 4 at such a potential, which will depend on other operating conditions, as to collect ions satisfactorily and the metallic grid or mesh of the storage electrode 3 at a potential, which is varied in a manner and to an extent which will be described hereinafter, between zero and at least twice the potential corresponding to the so-called. first secondary emission crossover of the insulating layer of the storage electrode.
  • the flooding beam i.e. the electron beam from the flood gun 6
  • the storage electrode grid is held at zero potential, with the Writing beam, i.e. the electron beam from the writing gun 5 cut off.
  • the storage electrode insulator is stabilised at the cathode potential of the flood gun, i.e. at zero volts, and the storage electrode grid is then increased in potential to a value slightly in excess of the first secondary emission crossover of the storage electrode insulator, the rate of increase of potential being sufl iciently slow that the insulator remains at zero potential and does not in crease in potential due to its capacitative relationship with the metallic grid.
  • the writing gun is now switched on in accordance with signals to be stored and displayed and is deflected by suitable means (not shown) across the storage electrode in known manner.
  • the voltage of the writing beam is arranged to be such that the secondary electron emission from the insulator of the storage target, in response to the impinging Writing beam, will cause those parts of the insulator struck by the writing beam to increase in potential despite the effect of the flooding beam. If the potential reached by the bombarded parts of the insulator exceeds the first secondary emission crossover then the potential of those parts will become stabilized, due to the action of the flooding beam, at the potential of the storage electrode metallic grid or mesh, which acts as the secondary electron collector. Any part of the insulator, however, which, although bombarded by the writing beam, does not reach the first more stabilized at the flood gun cathode potential.
  • the storage electrode insulator now carries a positive charge pattern corresponding to the applied signals and the flooding beam is enabled to pass through the interstices of the storage electrode at the positively charged areas and strike the fluorescent screen, with increased velocity so producing a pattern thereon representative of the applied signals.
  • the charge pattern on the storage electrode will remain substantially unchanged for so long as the flooding beam and the potential of the metallic grid of the storage electrode remain unchanged.
  • the potential of the metallic grid of the storage electrode may be raised in potential by an amount in excess of the first crossover potential of the storage electrode insulator and at suflicient speed to ensure that the surface of the insulator increases likewise in' potential due to the capacitative relationship between it and the metallic grid.
  • the Whole of the storage electrode surface is now stabilized at a positive potential and the Whole of the fluorescent screen is activated by the flooding beam.
  • the potential of the 7 storage electrode grid is now reduced to zero, the potential of the insulator consequently decreases and is once Alternatively, erasure may be carried out by merely decreasingthe storage electrode grid potential to zero and increasing it again to a potential in excess of the first crossover.
  • the Writing beam axis is perpendicular to the storage target.
  • This arrangement although not a necessity, is advantageous as it allows the fidelity of storage and reproductions to be increased.
  • This arrangement of the writing gun is possible due to the fact that the'arrangements in accordance with the present invention, unlike many known arrangements, do not require that the flooding beam be projected perpendicular to the storage electrode as the small variations in the storage electrode insulator potential due to the lack of normal incidence of the flooding beam are negligible compared with the dilference in potential between the charged and uncharged 'parts of the insulator.
  • a bistable signal storage arrangement comprising an electron discharge tube having a fluorescent screen, a storage electrode arranged parallel toiand spaced from said screen, said storage electrode comprising a metallic grid having a layer of insulating material deposited thereon on the side remote from said screen, a writing electron gun and a flood electron gun, means for operating said flood gun to provide a continuous flooding electron beam, a reference point having the potential of the flood gun cathode, a source of potential having a value with respect to the flood gun cathode potential between the first and second secondary emission cross-overs of said layer, means for connecting said grid during signal storage to said source, means for applying potentials to the cathode of said writing gun and said screen which are negative and positive respectively in relation to the flood gun cathode potential and means for switiching on said writing gun in correspondence with signals to be 2.
  • a bistable signal storing arrangement comprising an electron discharge tube having a fluorescent screen, a storage electrode arranged parallel to and spaced from said screen, said storage electrode comprising a metallic grid having a layer of insulating material deposited thereon on the side remote from said screen, a Writing electron gun, and a flood electron gun; means for operating said flood gun to provide a continuous flooding electron beam; a circuit point of reference potential; means for maintaining the flood gun cathode at said reference potential; means, including a source of potential having'a value between the first and second secondary, emission crossovers of said layer, for causing said gridto collect secondary electrons emitted by said layer during. signal storage; means for applying potentials tothe cathode. of said writing gunv and to said. screen which are negative and positive, respectively, in relation to said reference potential; and means for switching on said writing gun in correspondence with signals to be stored.
  • a bistable signal storage arrangement comprising an electron discharge tube having a fluorescent screen, a storage electrode arranged parallel to and spaced from said screen, said storage electrode comprising a metallic gridhaving a layer of insulating material deposited thereon on the side remote from said screen, a writing electron gun, and a flood electron gun; means for operating said flood gun to provide a continuous flooding electron beam; a circuit point of reference potential; means for maintaining the flood gun cathode at said reference po tential; means for initially connecting said grid prior to signal storage to said circuit point; a source of potential having a value between the first.

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Gas-Filled Discharge Tubes (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
US87625A 1960-02-15 1961-02-07 Storage tube with collectorbackplate unitary target Expired - Lifetime US3155869A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5294/60A GB895217A (en) 1960-02-15 1960-02-15 Improvements in or relating to signal storage arrangements

Publications (1)

Publication Number Publication Date
US3155869A true US3155869A (en) 1964-11-03

Family

ID=9793415

Family Applications (1)

Application Number Title Priority Date Filing Date
US87625A Expired - Lifetime US3155869A (en) 1960-02-15 1961-02-07 Storage tube with collectorbackplate unitary target

Country Status (5)

Country Link
US (1) US3155869A (fr)
CH (1) CH377882A (fr)
DE (1) DE1206530B (fr)
GB (1) GB895217A (fr)
NL (1) NL261197A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3325673A (en) * 1962-08-06 1967-06-13 Tektronix Inc Charge integrating bistable storage tube

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2788466A (en) * 1952-07-17 1957-04-09 Hughes Aircraft Co Direct-viewing storage tube
US2856559A (en) * 1952-06-26 1958-10-14 Rca Corp Picture storage tube
US2912614A (en) * 1953-11-06 1959-11-10 Emi Ltd Circuit arrangements embodying electron discharge devices

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2856559A (en) * 1952-06-26 1958-10-14 Rca Corp Picture storage tube
US2788466A (en) * 1952-07-17 1957-04-09 Hughes Aircraft Co Direct-viewing storage tube
US2912614A (en) * 1953-11-06 1959-11-10 Emi Ltd Circuit arrangements embodying electron discharge devices

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3325673A (en) * 1962-08-06 1967-06-13 Tektronix Inc Charge integrating bistable storage tube

Also Published As

Publication number Publication date
NL261197A (fr)
CH377882A (fr) 1964-05-31
GB895217A (en) 1962-05-02
DE1206530B (de) 1965-12-09

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