US2465342A - Electronic discharge device - Google Patents

Electronic discharge device Download PDF

Info

Publication number
US2465342A
US2465342A US482900A US48290043A US2465342A US 2465342 A US2465342 A US 2465342A US 482900 A US482900 A US 482900A US 48290043 A US48290043 A US 48290043A US 2465342 A US2465342 A US 2465342A
Authority
US
United States
Prior art keywords
electrodes
electrons
electrode
plates
path
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
US482900A
Other languages
English (en)
Inventor
Arditi Maurice
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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 International Standard Electric Corp filed Critical International Standard Electric Corp
Application granted granted Critical
Publication of US2465342A publication Critical patent/US2465342A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • H01J43/20—Dynodes consisting of sheet material, e.g. plane, bent

Definitions

  • Th present invention relates to electronic discharge devices and particularly discharge devices which provide for successive secondary electronic emissions.
  • a defect generally encountered in electronic discharge devices of this type is the appearance of interfering background noise in the output circult.
  • this background noise is due to the fact that electrons leave the main beam paths and disperse across the structure, often dropping directly upon the collecting electrode or upon secondary emission electrodes which are removed from the electrode where these electrons originated.
  • an efiect of the magnetron type may be produced which interferes with the grid control of the beams and is harmful to their homogeneity. As a result, the efliciency of the device is impaired:
  • Another object of the invention is to correctly concentrate the electronic beams upon emitting electrodes arranged in sequence.
  • a magnetic field is disposed parallel to the mean direction of the electrons so as to insure sharp focussing of the various electronic beams.
  • one or more transverse electric fields are provided. Th latter are electrostatically created byv deflecting plates and serve to insure the deflection of the beams and the separation of the paths of the primary and secondary electrons at each of In order tov obtain a still greater deflection of the electronic. beams from one target to the next, one or more magnetic fields are perpendicularly disposed to the mean direction of the electrons at points of j the emitting electrodes or targets.
  • a zero electric 130-. tential gradient region is created to allow the orthogonal deflecting electric field (or deflecting tards the electrons approaching the same.
  • control and focussing grids are provided in the vicinity of the various emitting electrodes for the control of the electronic beams.
  • Fig. 1 is a diagram illustrating the action of a' magnetic field on electronic paths directed in the same direction as the lines of force of the field
  • Fig. 2 is a diagram illustrating the action of a pair of deflecting plates on an electronic Path directed in the same direction as the lines of force electric fields) to deflect the electrons accelerated by the accelerating electric potential gradient exof a magnetic field in which the plates are im-. merged;
  • Fig. 3 is a diagram illustrating the action of two pair of deflecting plates on an electronic. path directed. in the same direction as the fines of force of amagnetic field in which the plates are immerged;
  • Fig. 4 is a diagrammatic view of a device using successive secondary electronic emissions and incorporating the novel features of the present invention
  • Fig. 5 illustrates another embodiment of the present invention using successive secondary electronic emissions
  • Figs. 6 and '7 illustrate, respectively, two modifications of the device according to Fig. 5;
  • Fig. 8 illustrates a modification of the structure according to Fig. 4.
  • Fig. 1 illustrates the spiral paths I, 2 of elec-. trons at initial speeds issuing from an emitting surface, such as a thermionic or photo-electricv cathode or a secondary emission electrode (not. shown).
  • paths I, 2 forma relatively small angle with the direction of the, lines of force of a magnetic field H.
  • Due to magnetic field H electrons following paths and 2 about imaginary cylinders 3 and 4 (whose axes are parallel mule lines of force of fleld H) are focussed and concentrated.
  • the electrons fall on a following emittingor collecting electrode, in av beam which reproduces, nearly in the same size, the image of the surface emitting these electrons. This image depends primarily upon the speed of the electrons, the strength of the magnetic fleld H and the dlmensioris oi any electron-optic lenses 6 at right angles with respect to the direction of;
  • plate pairs 5, 6, 8, 9 are immerged in longitudinal magnetic field H, the electronic paths such as 10, which cross this region will be deflected spatially.
  • the two pair of plates 5, 6, 8, ,9 may be replaced by two series of plate pairs being orthogonal between themselves and of difierent potentials. These potentials may for instance increase successively so as to modify the deflection of the beam during its travel between the plates.
  • the value of deflection in every case is a function of the speed of the electrons at the input of the deflecting plates; it is inversely proportional to the strength of magnetic field H and is a function, moreover, of the value of the electrostatic potential gradient or gradients established between the plates.
  • the emitting electrode structure comprices a primary cathode I I, of the photo-electric or thermionic type.
  • Elements I2, I3 and I 4 represent electrodes having good secondary electronic emission properties.
  • Element I5 is a vcollecting electrode producing no secondary emission.
  • a control grid 23 may be associated with the primary cathode and with other emitting electrodes of the structure in order to control the flow of electrons. This arrangement maybe used for example if it is desired to have the device operate as an amplifier, as indicated 'by the input circuit of grid 23 which is the usual amplifier connection type.
  • the output circuit of the device is likewise shown as the usual type of resistance-capacity connecting circuit.
  • the potential applied to the Electrodes II to I5 are surrounded by various electrodes II to 20 may be taken from a single potentiometer 24, as shown.
  • a magnetic field H is provided which is adapted to act in the direction of the paths of the mean directions of electrons coming from one of the emitting electrodes II to II.
  • An electric field E (Fig. 8) is created between deflection plates 2
  • the primary electrons emitted by cathode II are controlled by grid 23 and then accelerated by electrode 20.
  • the electrons are driven by magnetic field 'H without deflection until they enter between deflecting plates 2
  • the secondary electrons emitted by electrode I2 are accelerated thereupon and travel the same path as the primary electrons until they enter between plates 2
  • the secondary electrons are then deflected towards the right, whereby separation of the primary and secondary beams is obtained, and directed towards electrode I3, where the process is repeated.
  • the secondary electrons emitted by the lastsecondary emission electrode I4 are gathered by collecting electrode Secondary emission electrodes I 2, I3, I 4 may be brought to the same potential.
  • focusing cylinders I'I, I8, and I9 associated with these electrodes may be brought to the same potential (by means of potentiometer 24). The reason for' this is that the secondary emission electrodes need not have increasing potentials because electronic beam control, i. e.
  • electrostatic plates 2, 2 may be broken up, if desired, into several pair of plates raised to different potentials; the emitting electrodes are then spaced to a greater or lesser extent, depending upon the deflections produced by these successive plate pairs.
  • electrodes l2 to I4 may all be brought to the same potential, they may be made of a single conductive support, or of two supports to facilitate mounting. These supports may consist, for instance, of flat conductive plates, but preferably, are given the shape of cylinders or cylinder portions. The focusing electrodes may then be replaced by a grid common to all the electrodes; if the emitting electrodes are formed on cylinder portions, it becomes convenient to use a cylindrical grid electrode. These variations are incorporated in the embodiment shown in Fig.5.
  • electrodes I2 and M are formed on the inner surface of a conductive cylinder portion 25 and electrodes I3 and I5 on the inner surface of another conductive cylinder portion 26, preferably of the same radius of curvature as portion 25,
  • the two cylindrical portions 25 and 26 are cylinder 28 is preferably arranged coaxially with grid 21 between grid 21 and electrostatic deflection plates M and 22.
  • the purpose of cylinder 28 is to serve as an electric screen between the region near grid 21 and the region of the electrostatic plates 21, 22.
  • Suitable openings such as 30, 3
  • Cathode II is independent of the other electrodes and may be associated with any electronoptic system accelerating and controlling the flow of electrons.
  • Fig. 5 shows an accelerating ring 32 and a control grid 33 associated with photo-cathode l l.
  • spatial deflection may be obtained by means of two plates or a' series of orthogonal plates.
  • a series of orthogonal plates 35, 36 and 31 may be arranged between plates 2i and 22, as shown in Fig. 6. Plates 35, 36 and 31 are brought to increasin potentials along the structure. Such an arrangement allows better adjustment of the gradient and of the direction of the successive deflections of the electronic beams.
  • One or more cylindrical grids may also be added in the structure shown in Figs. 5 and 6, same being disposed coaxially with grid 21.
  • These cylindrical grids may perform divers functions. Specifically, instead of being provided with openings in front of electrodes II to IE, they may be shaped at these points so as to constitute together electron-optic systems insuring acceleration (or retardation) and focussin of the electronic beams. Alternatively, they may be coated at these points with a substance having good secondary emission properties, and thus serve to" increase the amplification of current in the de vice, their forms assuring a suitable passage of the secondary electrons emitted from one grid to the next and to the external electrode. As
  • these grids 38, 39 may for instance be provided only at one end of the struc ture, opposite collecting electrode l5. It will be clear that such an arrangement may also be used in the structure according to Fig. 4;.
  • An additional deflection of the electronic beams may be obtained by means of supplementary magnetic fields directed perpendicularly to the general paths of the electronic beams outside the electrostaticshown.
  • These coil pairs create deflecting magnetic fields HI and H2 disposed at right angles to the mean paths of the electrons in the spaces comprised between the emitting electrodes and the electrostatic plates.
  • the paths of the beams are then such as indicated by the dotted lines shown in Fig. 4.
  • the primary and secondary beams of each electrode separate only between the electrostatic plates. the same path in the region between the electrode and the plates, joint deflection being obtained over this path by magnetic field Hl or H2.
  • and 42, 43 may be adjusted at Will around vessel 34. If desired, a single coil pair, producing a single addi-' tional deflection may be used.
  • An electron discharge device comprising a primary electrode for emitting electrons, a plurality of secondary electrodes for emitting secondary electrons, said electrodes being arranged in sequence, said secondary electrodes being arranged to receive incident electrons emitted from a .preceding electrode and to emit secondary electrons to a following electrode in an adjacent path directed parallel with and opposite to the path of the incident electrons, a collecting electrode for receiving secondary electrons, means arranged about said electrodes for producing a magnetic field parallel to the mean direction of said parallel paths for focusing incident and emitted electrons in said parallel paths, and means for deflecting the emitted from the incident electrons in the several parallel paths into distinctly 2.
  • T h e device claimed in claim 1. comprisinga;
  • said electric means consists of a. pair of deflectin plates disposed parallel to each other, said electrostatic field produced by'said plates extending uniformly over said paths and disposed perpendicularly to said magnetic field.
  • the device claimed in claim 1, comprising a plurality of retarding electrodes, one of said retarding electrodes being associated With each one of said primary, secondary and collecting electrodes, whereby electrons approaching the emitting surfaces of said primary, secondary and collecting electrodes are retarded and conductive means interconnecting said retarding electrodes, the latter being adapted to operate at the same potential.
  • the device claimed in claim 1 comprising a plurality of retarding electrodes, one of said retarding electrodes being associated with each one of said primary, secondary and collecting electrodes, whereby electrons approaching the emitting surfaces of said primary, secondary and collecting electrodes are retarded; and conductive means interconnecting said retarding electrodes, the latter being adapted to operate at the same potential; said secondary electrodes being interconnected and adapted to be brought to the same potential.
  • said electric means consists of a pair of deflecting plates disposed .parallel'to each other, said electrostatic field produced by said plates being disposed perpendicularly to said magnetic field and a plurality of electrostatic control plates, same being disposed parallel to one another, between,
  • control plates aiding in the deflection of said electron beams.
  • said electric means consists of a plurality of pairs of deflecting plates.
  • a primary electrode a plurality of secondary electrodes, a collecting electrode, means for supplying a plurality of different potentials to said primary and collecting electrodes, respectively, conductive means connecting said secondary electrodes to one another and to said supply means, a retarding electrode associated with each one of the aforementioned electrodes, said retarding electrodes acting as focusing cylinders, the retarding electrodes associated with said primary and collecting electrodes, respectively, being separately connected to said supply means;
  • said retarding electrodes associated with said secondary electrodes being connected to one another and said supply means, a plurality of accelerating electrodes associated with said primary and control electrodes and selected secondary electrodes, and a control grid associated with said primary eelctrode, an input resistance-capacity circuit connected to said control grid, and an output resistance-capacity circuit connected to said collecting electrode, means for producing a magnetic field, the latter being disposed parallel to the mean speed direction of the emitted electrons, a-pair of electrostatic plates disposed parallel to each other and producing'an electrostatic field disposed perpendicularly to said magnetic field, whereby said magnetic field concentrates the emitted electrons in sharply focussed electron beams, while said electrostaic plates deflect said beams, electrons being projected by said primary electrode to the first secondary electrode and secondary electrons travelling from the latter to the next following secondary electrode and so forth, the last secondary electrons emitted being projected onto the collecting electrode.
  • said means being disposed outside said envelope with, the auxiliary magnetic field arranged perpendicularly to the magnetic field produced by said first means.
  • each of said electrodeunits being shaped like a
  • said conductive non-magnetic cylinder and cylindrically wound wire being provided with apertures registering with said individual emitting surfaces; said primary electrode beingformed by electron-optic means and said cylindrically wound wire and conductive non-magnetic cylinder each having an opening registering with said primary electrode to admit a beam of light thereto.
  • An electronic discharge device a primary electrode emitting electrons in one path, a first secondary emitting electrode adapted to receive primary electrons and emit secondary electrons in an adjacent path directed parallel with and opposite to said first path, at least one further secondary electrode separated from the first secondary electrode and adapted to receive electrons from a preceding path and emit secondary electrons in a subsequent adjacent path extending in a direction parallel with and opposite to said preceding path, a collecting electrode adapted to receive secondary electrons from a preceding path, the potential difference between cooperating secondary electrodes being substantially zero, means for producing a magnetic field parallel to the mean direction of the electrons emitted by said emitting electrodes to focus the primary and secondary electrons in said parallel paths, and means for deflecting the electrons in the several parallel paths into distinctly separate paths.
  • An electronic discharge device a primary electrode emitting an electron beam, a first secondary electrode adapted to receive said beam and emit secondary electrons in an adjacent path of parallel and opposite direction to the path of the received beam, at least one further secondary electrode separated from said first secondary electrode and adapted to receive a preceding beam and emit an adjacent beam in a path parallel with and opposite to the direction of the path of the received beam, a collecting electrode adapted to receive electrons from a preceding beam, the potential difference between cooperating secondary electrodes being substantially zero, means for producing a magnetic field parallel to the mean direction of the electrons emitted by said emitting electrodes to focus the primary and the secondary electrons in said parallel paths, and means for generating an electrostatic field uniformly extending over said adjacent beams and substantially perpendicular thereto to deflect the electrons in the several parallel paths into distinctly separate paths.
  • An electronic discharge device a primary electrode having an emitting surface adapted to j'e'mit electrons in one path, a series of secondary electrodes separated'fromeach other each having an emitting surface adapted toreceiv-e electrons I from apreceding emitting surface and to emit secondary electrons in' an adjacent path parallel with and opposite to that from the preceding ting surface, the potential difference between secondary electrodes of said series being substantially zero, means for producing a magnetic field parallel to the mean direction of emitted electrons to focus the incident and emitted electrons into sharply defined parallel paths, and means for producing a plurality of electrostatic fields perpendicular to said beams to deflect incident electrons from emi-ttedelectrons in 'theseveral .parallel paths into distinctlyseparate paths.
  • An electronic discharge device end electrode means including a primary electrode to start'electrons on a winding path and a collectorelectrode to receive electrons therefrom, a series of intermediate electrode means arranged along said path separated from each other and each adapted to receive electrons from and to emit electrons in said paths, said means including secondary electrodes having a potential difference between each other which is substantial- 1y less than that existing between one of said end electrodes and said secondary electrodes, and means for directing electrons received at and emitted from a secondary electrode to pass, for at least part of their way, in adjacent separate paths of parallel and opposite directions.
  • An electronic discharge device end electrode means including a primary electrode to start electrons on a winding electron path and a collector electrode to receive electrons therefrom, a series of intermediate electrode means arranged along said path separated from each other and adapted to receive electrons therefrom and to emit electrons therein, said means comprising substantially equipotential secondary electrodes, the paths of the received and emitted electrons being substantially parallel adjacent the said intermediate electrode means, means arranged about said intermediate electrode means for focusing said received and emitted electrons in said parallel paths, and means for separating the emitted from the incident electrons in the several parallel paths and for deflecting the emitted electrons into the said winding path.
  • a device as claimed in claim 22, comprising a magnetic field parallel to said paths to separate said electrons.
  • a device as claimed in claim 23, comprising a magnetic field parallel to said paths to separate said electrons.
  • a device as claimed in claim 23, comprising an electrostatic field to deflect said paths equally and perpendicularly to the direction of electron emission.
  • a device as claimed in claim 23, comprising a number of electrostatic fields, each deflecting electrons from one path to an adjacent path of similar direction.

Landscapes

  • Electron Sources, Ion Sources (AREA)
US482900A 1941-07-28 1943-04-13 Electronic discharge device Expired - Lifetime US2465342A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR2465342X 1941-07-28

Publications (1)

Publication Number Publication Date
US2465342A true US2465342A (en) 1949-03-29

Family

ID=9685553

Family Applications (1)

Application Number Title Priority Date Filing Date
US482900A Expired - Lifetime US2465342A (en) 1941-07-28 1943-04-13 Electronic discharge device

Country Status (2)

Country Link
US (1) US2465342A (enrdf_load_stackoverflow)
FR (1) FR959708A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2558337A (en) * 1945-12-10 1951-06-26 Howard A Chinn Noise generator
US3032678A (en) * 1959-08-31 1962-05-01 Burroughs Corp Magnetron tube

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3143097A (en) * 1961-03-08 1964-08-04 Eastern Res Group Propulsion systems for water borne craft

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1903569A (en) * 1926-09-15 1933-04-11 Kenneth W Jarvis Electron tube
US2026892A (en) * 1931-11-11 1936-01-07 Heintz & Kaufman Ltd High frequency generator
US2157585A (en) * 1936-07-25 1939-05-09 Rca Corp Electric discharge device
US2172738A (en) * 1936-02-03 1939-09-12 Cathode ray tube
US2179996A (en) * 1936-11-09 1939-11-14 Farnsworth Television & Radio Electron multiplier
US2188410A (en) * 1936-10-26 1940-01-30 Rca Corp Electron multiplier
US2203048A (en) * 1938-06-13 1940-06-04 Farnsworth Television & Radio Shielded anode electron multiplier
US2219871A (en) * 1936-07-22 1940-10-29 Rca Corp Electric discharge device
US2244318A (en) * 1937-12-31 1941-06-03 Bell Telephone Labor Inc Electron discharge device
US2263032A (en) * 1936-11-04 1941-11-18 Farnsworth Television & Radio Cold cathode electron discharge tube
US2271985A (en) * 1939-09-01 1942-02-03 Rca Corp Electron discharge device
US2292847A (en) * 1939-11-30 1942-08-11 Rca Corp Electron multiplier

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1903569A (en) * 1926-09-15 1933-04-11 Kenneth W Jarvis Electron tube
US2026892A (en) * 1931-11-11 1936-01-07 Heintz & Kaufman Ltd High frequency generator
US2172738A (en) * 1936-02-03 1939-09-12 Cathode ray tube
US2219871A (en) * 1936-07-22 1940-10-29 Rca Corp Electric discharge device
US2157585A (en) * 1936-07-25 1939-05-09 Rca Corp Electric discharge device
US2188410A (en) * 1936-10-26 1940-01-30 Rca Corp Electron multiplier
US2263032A (en) * 1936-11-04 1941-11-18 Farnsworth Television & Radio Cold cathode electron discharge tube
US2179996A (en) * 1936-11-09 1939-11-14 Farnsworth Television & Radio Electron multiplier
US2244318A (en) * 1937-12-31 1941-06-03 Bell Telephone Labor Inc Electron discharge device
US2203048A (en) * 1938-06-13 1940-06-04 Farnsworth Television & Radio Shielded anode electron multiplier
US2271985A (en) * 1939-09-01 1942-02-03 Rca Corp Electron discharge device
US2292847A (en) * 1939-11-30 1942-08-11 Rca Corp Electron multiplier

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2558337A (en) * 1945-12-10 1951-06-26 Howard A Chinn Noise generator
US3032678A (en) * 1959-08-31 1962-05-01 Burroughs Corp Magnetron tube

Also Published As

Publication number Publication date
FR959708A (enrdf_load_stackoverflow) 1950-04-04

Similar Documents

Publication Publication Date Title
US2357922A (en) Electronic translating device
US2611099A (en) Color television picture tube
US2752520A (en) Tri-color kinescope
US2390250A (en) Cathode ray tube and circuit
US2214019A (en) Electronic switching device
US2769110A (en) Electron beam control means
US2464562A (en) Discharge tube
US3331985A (en) Character generating system utilizing a cathode ray tube in which a portion of a plurality of electron beams are selectively defocussed to form the character
US2230134A (en) Image analyzing tube
US2163966A (en) Box element multiplier
US2223908A (en) Cathode ray tube
US2332881A (en) Cathode ray tube arrangement
US2459724A (en) Astatic cathode-ray tube
US2563197A (en) Tube with electron velocity compensation
US2465342A (en) Electronic discharge device
US2214729A (en) Magnetic field neutralizing system
US2080449A (en) Cathode ray tube
US2176221A (en) Electron discharge apparatus
US2147756A (en) Secondary electron tube
US2237671A (en) Electron discharge device
US3295010A (en) Image dissector with field mesh near photocathode
US2267823A (en) Scanning device for television
US2921212A (en) Gun system comprising an ion trap
US2412086A (en) Image dissector tube
US2172728A (en) Electron discharge device