US3302054A - Direct viewing storage tube having inclined flood gun and virtual cathode - Google Patents

Direct viewing storage tube having inclined flood gun and virtual cathode Download PDF

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Publication number
US3302054A
US3302054A US273068A US27306863A US3302054A US 3302054 A US3302054 A US 3302054A US 273068 A US273068 A US 273068A US 27306863 A US27306863 A US 27306863A US 3302054 A US3302054 A US 3302054A
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Prior art keywords
grid
gun
electrons
storage
storage grid
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Expired - Lifetime
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US273068A
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English (en)
Inventor
Courtan Bernard
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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
    • 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

  • the present invention relates to direct View storage tubes, that is to tubes comprising two guns and a so-called storage grid covered with an insulation on the face thereof turned toward the guns, one of these guns, provided with usual intensity control devices and electron beam deflection devices, being the writing gun that emits electrons of which the speed is sufficient so that a deposit of positive charges is possible on the insulation of the grid, and the other gun being a flood gun which sends a slow and uniform beam over the entire grid.
  • the known tubes of this type comprise generally the flooding gun in the axis of the tube and the writing gun disposed laterally in such a manner as to emit an oblique beam with respect to this axis. It may, nevertheless, be useful, for reasons of bulkiness and interchangeability with conventional cathode ray tubes, to dispose the guns in an inverse fashion, that is to place the writing gun in the axis of the tube and to reduce very significantly the length of the tube with the same dimensions of the image. Nevertheless, one encounters then the difiiculty in that the flooding gun, which ione is obligated to dispose laterally, is not capable of uniformly flooding the storage grid.
  • the present invention relates to direct viewing tubes of reduced length .with an axial writing gun, and has for its purpose to remedy the difliculty exposed hereinabove, so as to assure a uniform flooding of the storage grid by the flooding gun.
  • a grid carried at a potential near that of the cathode of the flooding gun.
  • This grid decelerates the electrons of this gun which arrive at its level with a substantially zero velocity.
  • These electrons are accelerated anew by the relatively strong and uniform field which exists between this deceleration grid 'and the socalled collector grid, usually disposed in front of the stor-
  • This arrangement permits the observation during 3,362,054 Patented Jan. 31, 1967 age grid and carried at a relatively high positive potential.
  • This field straightens the electron trajectories which arrive at the collector grid substantially perpendicularly to the surface thereof, to traverse this grid, attain the storage grid and eventually traverse the same to reach the screen as in the known direct viewing storage tubes.
  • This deceleration grid therefore constitutes in fact a virtual cathode of large surface, emitting at slow speed the flooding electrons uniformly and perpendicularly to the storage grid, notwithstanding the lateral position of the flooding gun.
  • Another object of the present invention resides in the provision of a direct view storage tube in which the writing gun is arranged axially to the tube while the flooding gun is arranged laterally of this axis without, however, producing any non-uniformities in the viewed picture.
  • Still another object of the present invention resides in the provision of a direct view storage tube in which, for reasons of bulkiness and interchangeability with ordinary cathode ray tubes, the writing gun is arranged in the axis of the tube while the flooding gun is arranged laterally thereof thereby considerably reducing the length of the tube with sameness in the dimensions of the viewed image.
  • a still further object of the present invention resides in the provision of a direct viewing storage tube provided with an asymmetrically disposed flooding gun in which simple means are provided to assure satisfactory uniformity of the viewed picture on the screen.
  • the writing gun 2 composed of a cathode 3 carried, for example, at a potential of 2 kv., of a Wehnelt electrode 4 carried at a suitable potential taking into consideration the desired intensity of the beam, and of a series of anodes 6, 7 and 8, wherein the anodes 6 and 8 are carried, for example, at zero potential, and the intermediate anode 7 is carried at a potential sufiicient to concentrate the electrons into a fine beam, for example, 'at +1.3 kv.
  • the beam 5 is subjected to the action of deflection means, for example, of magnetic deflection means, it being understood that the mention of magnetic deflection means is not limitative of the present invention, of which a portion is represented in cross section by two windings 9 and 10 disposed along the periphery of the neck of the tube.
  • Reference numeral 11 designates the interior metallization of the tube, carried, for example, at +10 v.
  • reference numeral 12 designates the collimation electrode, carried, for example, at +20 v.
  • reference numeral 13 the fluorescent screen, carried, for example, at +10 kv.
  • a first, so-called storage grid 14 covered with an insulation on the side opposite the screen and carried, for example, at a potential of +6 v.;
  • collector grid 15 carried, for example, at a potential of the order of +250 v.
  • a third grid 16 disposed at some millimeters from the grid 15 and parallelly to the latter and to the grid 14, and carried at a potential of the order of +5 to v.
  • the flooding gun 17 composed of a cathode 18, carried, for example, at zero potential, of an accelerating anode 19 carried at a potential of the order of +100 to +150 v., and of a Wehnelt electrode 20 carried at a suitable potential whereby the flooding beam 21 leaves the gun with a large angle of aperture to enable the beam to flood the entire surface of the grid 16.
  • the electrons of the beam 21 arrive at all points of the grid 16 with a substantially Zero velocity, thereupon, after having traversed this grid 16, restart under the influence of the accelerating potential of grid along parallel trajectories or paths perpendicular to the grids 14, 15 and 16 and with a substantially identical velocity at all points of the cross section of the beam.
  • the electrons uniformly flood the entire surface of the grid 14 of which the potential with respect to the cathode 18 is such that they are relatively slow, that is that they produce at the impact of the grid 14 less secondary electrons leaving the dielectric covering this grid than the quantity of primary electrons arriving thereat.
  • the insulating face of the grid 14 is thereby charged negatively and repels the beam 21 in such a manner that at the state of equilibrium this beam just barely reaches the grid without traversing the same.
  • the insulating face of the grid 14 finds itself swept with creation of positive charges since, at the speed of these electrons, there are less primary electrons than secondary electrons due to the impact thereof.
  • the positive charges form a relief conforming to the variations of the signal and compensate more or less the negative charges deposited by the slow beam 21.
  • the electrons of the latter may then pass in more or less large quantity through the grid 14, are accelerated by the high voltage of the screen 13, and bombard the latter While exciting the observed image as in the known direct viewing tubes.
  • a direct viewing storage tube comprising:
  • writing electron gun means located along an axis substantially perpendicular to said screen means and including means for emitting a beam of relatively rapid electrons in the direction toward said storage grid means,
  • flood gun means located laterally to and inclined with respect to said axis including means for emitting a beam of relatively slow electrons in the direction toward said storage grid means,
  • a direct viewing storage tube comprising: a fluorescent screen
  • writing electron gun means located along an axis substantially perpendicular to said screen and including means for emitting a beam of relatively rapid electrons in the direction toward said storage grid means, means for impressing a signal upon said first-mentioned beam and means for deflecting said firstmentioned beam to thereby sweep said storage grid means and therewith store said signal therein,
  • flood gun means located laterally and tilted with respect to said axis and operable to emit a beam of electrons, said flood gun means including means for emitting a widely diverging beam of relatively slow electrons in a direction toward said storage grid means,
  • deceleration grid means extending between said flood flood gun means and said storage grid means and disposed substantially parallely to the latter, said deceleration grid means being carried at a potential to decelerate said slow electrons substantially to zero velocity upon arrival in the plane of said decelerating grid means, and means for re-accelerating the electrons from said flood gun means after passing said deceleration grid means for flooding said storage grid means along substantially parallel paths substantially perpendicular to said storage grid means.
  • a direct viewing storage tube comprising:
  • writing electron gun means located along an axis substantially perpendicular to said screen including means for emitting a beam of relatively rapid electrons in the direction toward said storage grid means, means for impressing a signal upon said first-mentioned beam and means for deflecting said firstmentioned beam to thereby sweep said storage grid means and therewith store said signal therein,
  • flood gun means located laterally and tilted with respect to said axis and operable to emit a beam of elecrons, said flood gun means including means for emitting a widely diverging beam of relatively slow electrons in a direction toward said storage grid means,
  • deceleration grid means extending between said flood gun means and said storage grid means and disposed substantially parallelly to the latter, said deceleration grid means being carried at a potential to decelerate said slow electrons substantially to zero velocity upon arrival in the plane of said decelerating grid means,

Landscapes

  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
US273068A 1962-05-03 1963-04-15 Direct viewing storage tube having inclined flood gun and virtual cathode Expired - Lifetime US3302054A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR896282A FR1329685A (fr) 1962-05-03 1962-05-03 Tube à entretien d'images à canon d'inscription axial

Publications (1)

Publication Number Publication Date
US3302054A true US3302054A (en) 1967-01-31

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US273068A Expired - Lifetime US3302054A (en) 1962-05-03 1963-04-15 Direct viewing storage tube having inclined flood gun and virtual cathode

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US (1) US3302054A (enrdf_load_stackoverflow)
DE (1) DE1200959B (enrdf_load_stackoverflow)
FR (1) FR1329685A (enrdf_load_stackoverflow)
GB (1) GB1004949A (enrdf_load_stackoverflow)
NL (1) NL292012A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3576457A (en) * 1968-08-23 1971-04-27 Fairchild Camera Instr Co High-resolution direct-view storage tube
US3717786A (en) * 1970-07-20 1973-02-20 Tektronix Inc Post-deflection acceleration storage tube
US3838309A (en) * 1972-06-16 1974-09-24 Westinghouse Electric Corp Direct view storage tube having a lateral field neutralizing electrode adjacent the storage grid
US3956712A (en) * 1973-02-05 1976-05-11 Northrop Corporation Area electron gun

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2824259A (en) * 1955-06-06 1958-02-18 Hughes Aircraft Co Virtual flood-electron source
US2927239A (en) * 1957-09-27 1960-03-01 Itt Information storage tube

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB827829A (en) 1957-08-15 1960-02-10 Hughes Aircraft Co Improvements in or relating to electronic storage tubes

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2824259A (en) * 1955-06-06 1958-02-18 Hughes Aircraft Co Virtual flood-electron source
US2927239A (en) * 1957-09-27 1960-03-01 Itt Information storage tube

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3576457A (en) * 1968-08-23 1971-04-27 Fairchild Camera Instr Co High-resolution direct-view storage tube
US3717786A (en) * 1970-07-20 1973-02-20 Tektronix Inc Post-deflection acceleration storage tube
US3838309A (en) * 1972-06-16 1974-09-24 Westinghouse Electric Corp Direct view storage tube having a lateral field neutralizing electrode adjacent the storage grid
US3956712A (en) * 1973-02-05 1976-05-11 Northrop Corporation Area electron gun

Also Published As

Publication number Publication date
DE1200959B (de) 1965-09-16
NL292012A (enrdf_load_stackoverflow)
GB1004949A (en) 1965-09-22
FR1329685A (fr) 1963-06-14

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