US2225455A - Cathode ray device - Google Patents

Cathode ray device Download PDF

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Publication number
US2225455A
US2225455A US257905A US25790539A US2225455A US 2225455 A US2225455 A US 2225455A US 257905 A US257905 A US 257905A US 25790539 A US25790539 A US 25790539A US 2225455 A US2225455 A US 2225455A
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US
United States
Prior art keywords
cathode ray
electrodes
path
electron
electrons
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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
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US257905A
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English (en)
Inventor
Klauer Fritz
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.)
Siemens APP und Maschinen GmbH
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Siemens APP und Maschinen GmbH
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Publication date
Application filed by Siemens APP und Maschinen GmbH filed Critical Siemens APP und Maschinen GmbH
Application granted granted Critical
Publication of US2225455A publication Critical patent/US2225455A/en
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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
    • H01J29/70—Arrangements for deflecting ray or beam
    • H01J29/78—Arrangements for deflecting ray or beam along a circle, spiral or rotating radial line, e.g. for radar display
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R13/00—Arrangements for displaying electric variables or waveforms
    • G01R13/20—Cathode-ray oscilloscopes

Definitions

  • Myinvention relates to-improvements in cathode ray tubes of the oscillograph type andp-articularly in tubesv wherein a curvilinear orfcircuylar time base is utilzedfor indicating electrical phenomena.
  • a cathode ray tube having a fluorescent screen for measurements wherein the time base is evidenced byy a f closed curved trace onk the fluorescent screen.
  • the time base may be formed on such a screen ⁇ byelectrostatic or electromagnetic means but it ,has been diiiicult to displace the electron beam of such tubes in a radial Vdirection in response to a signal to be measured inasmuch as the .tubes of the priorart have obstructing electrode supporting structure either in the path of the cathode ray beam or between the uorescent screen and the observer.
  • ⁇ In accordance with my invention I provide a cathode ray tube having a fluorescent screen with means to generate an electron beam and deflect the beam along a. curvilinear or circular path and Vfurther dellect the beam radially .to the said path rwith electrostatic structure entirely removed -from the path of the beam without the interposition of any obstructing medium Without the tube.
  • the cathode ray tube comprises an evacuated envelope or bulb I having an rvelongated neck section enclosing an electron gun tional type and comprises a cathode'3 from which an electron stream may be drawn, a control electrode 4 connected to l the usual biasing battery and a rst anode 5 maintained vpositive With respect to the .cathode 3.
  • the electron 5 stream leaving the first anode 5 is accelerated and concentrated into an electron scanning beam by a second anode 6 which is preferably a conductive coating on the inner surface of the bulb ⁇ l over ⁇ a portion of .the n-eck and frusto-conical sections. ⁇ l
  • the iirst anode and the second anode 6 are maintained at the desired positive potentials by a-potential source such as the battery l.
  • Conventional deflection means such as the electromagnetic coils 8 and 9 may be used to sweep ⁇ the ⁇ 15 beam so as to* produce a curvilinear or circular luminous trace on the fluorescent screen! by applying alternating current to the coils 8 Which are leading or lagging the current applied .to the coils 9. It is obvious that conventional electrostatic plates may be substituted for the deection coils if desired whereupon thedeection plates-Would be supplied by alternating voltages having the desired phase relationship.
  • n Inv accordance with my invention I provide bef tween the' curvilinear or circular trace beam deiiecting means such as the .coil-s Band Sand a target adapted to'- become luminescent when Ibombarded with electrons such as the fluorescent screen 2, means for producing a non-homogeneous axially symmetric electrostatic 'eld ⁇ for deflecting the beam in'a radial direction with lrespect to the curvilinear or circular deiiection.
  • the curvilinear or circular trace beam deiiecting means such as the .coil-s Band Sand a target adapted to'- become luminescent when Ibombarded with electrons such as the fluorescent screen 2
  • means for producing a non-homogeneous axially symmetric electrostatic 'eld ⁇ for deflecting the beam in'a radial direction with lrespect to the curvilinear or circular deiiection means for producing a non-homogeneous axial
  • a homogeneous electrostatic longitudinal eld does not exercise upon an electron moving in the direction" of this field anyv radially directed force'but ⁇ this elTect Will be produced by ya non-homogeneous axially symmetric eldfor the reason thatthere is set up a radial component of deflection in additionr to a local change in the longitudinal com, ponent of the field.
  • Such an electrostatic field produces upon a beam of moving electrons an influence similar to that produced by an optical lens upon the path of luminous rays.
  • I provide means for imp-art- 45 ving a radial component of velocity to a moving diaphragm electrodes Ill and II spaced longitudinally along the path of the beam with an intermediate apertured disc or diaphragm electrode I2 electrically insulated from the diaphragme I0 and I I which are electrically connected together.
  • the electrically connected electrodes I0 and II are preferably supported in the neck of the tube within the second anode 6, and may have a potential applied thereto through the lead I3, the intermediate electrode I2 likewise being provided with a lead ICI.
  • the diaphragms I D and II and the diaphragm I2 may be connected indirectly to the second anode 6 through a bridge network of equivalent resistors I5 and IS so that their mean potential may be maintained equivalent to that of the second anode.
  • the impedance ofthe network is relatively high, the resistors 'having a resistance of around I megohm so that potentials, which it is desired to measure, unbalancethe network and produce an electrostatic deflection field between the electrode I3 and the electrodes II and l2.
  • the deflection means such as the coils 8 Yand 9, sweep the cathode ray beam so as to form a curvilinear or circular trace on the screen 2, the beam sweeping out and generating an imaginary cone having its apex at the center of deiiection of the coils 8 and 9 and its base on the fluorescent screen 2, the boundaries of which are indicated by the lines CA and CB in Figure 1.
  • the longitudinal component of the electrostatic field existing in the apertures will determine the extent of the radial deflection imparted to the beam by the eld existing between the electrodes. It is, therefore, desirable to provide the electrodes I0, II and I2 spaced closely together in the direction of the tube axis. A spacing of 1 mm. between these electrodes has been found suitable although for various deflection sensitivities or various applied potentials this spacing may be either less or greater than the above mentioned value.
  • a cathode ray oscillograph tube comprising an envelope, a target adjacent one end of said envelope adapted to become luminescent when bombarded by high velocity electrons, an electron gun adjacent the opposite end of said envelope and exposed to said target to generate and direct -an electron beam along the axis of said envelope, means between the gun and target for sweeping the beam from said gun along a closed curved path on said target, and means comprising three closely spaced apertured disc electrodes surrounding a portion of and removed from the normal undeflected path of the beam for deflecting the beam from the closed curved path.
  • a cathode ray oscillograph tube having an envelope, an electron emitting cathode to produce a ow of electrons, an anode to produce a focused beam of electrons, a screen adapted to become luminescent when bombarded by electrons from said gun, means to deflect the electron beam from said gun over said screen along a closed curved path, a pair of apertured closely spaced disc electrodes enclosed within said anode in a substantially field-free space generated by said anode and between said deection means and said screen and an apertured disc electrode between said pair of disc electrodes to generate therewith a radial beam deflection held, the apertures of each of said disc electrodes being in axial alignment with each other and with said gun. 3.
  • a cathode ray oscillograph device for measuring electrical phenomena comprising an evacuated envelope, an elongated electron gun to generate a beam of electrons, an electron receiving target exposed to said electron gun' and intersecting the longitudinal axis of said gun, beam deflecting means to deliect the beam generated by said gun from the longitudinal axis of said gun and along a closed curved path, a series of three apertured discs perpendicular to the longitudinal axis removed from and surrounding said axis, and means to apply the electrical phenomena to be measured between the central disc and the remaining discs.
  • a cathode ray oscillograph device for measuring electrical phenomena comprising an electron source to generate a stream of electrons,L a pair of associated anodes to accelerate and focus the stream of electrons from said source into-an electron beam, beam deflecting means to deflect the beam from its normal path, three apertured beam deecting diaphragms surrounding the normal undeected path of said beam Within one of said anodes and Wholly removed from the j normal undeflected path of said'bear'n, means to apply a potential difference between the innermost diaphragm and the other two diaphragms for additionallydelecting the beam from itsV initially deected path, and an electron receiving target in the path of the additionally deected beam.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
US257905A 1937-07-07 1939-02-23 Cathode ray device Expired - Lifetime US2225455A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE516786X 1937-07-07

Publications (1)

Publication Number Publication Date
US2225455A true US2225455A (en) 1940-12-17

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US257905A Expired - Lifetime US2225455A (en) 1937-07-07 1939-02-23 Cathode ray device

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US (1) US2225455A (en(2012))
GB (1) GB516786A (en(2012))
NL (1) NL53220C (en(2012))

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2424788A (en) * 1942-12-01 1947-07-29 Gen Electric Electron microscope
US2603550A (en) * 1951-07-12 1952-07-15 Philco Corp Method of aligning cathode-ray tube assemblies
US2737609A (en) * 1950-11-30 1956-03-06 Rca Corp Electron beam convergence systems
US3154710A (en) * 1958-11-13 1964-10-27 Motorola Inc Cathode-ray display system having electrostatic magnifying lens
US3205391A (en) * 1957-11-18 1965-09-07 Multi Tron Lab Inc Negative-lens type deflection magnifying means for electron beam in cathode ray tubes
US3289034A (en) * 1961-05-24 1966-11-29 Philips Corp Cathode-ray tube having an auxiliary electrode between the control grid and the anode electrode
US3320458A (en) * 1962-01-18 1967-05-16 Nippon Electric Co Cathode ray tubes employing a novel convergent electrostatic lens system for beam modulation

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2424788A (en) * 1942-12-01 1947-07-29 Gen Electric Electron microscope
US2737609A (en) * 1950-11-30 1956-03-06 Rca Corp Electron beam convergence systems
US2603550A (en) * 1951-07-12 1952-07-15 Philco Corp Method of aligning cathode-ray tube assemblies
US3205391A (en) * 1957-11-18 1965-09-07 Multi Tron Lab Inc Negative-lens type deflection magnifying means for electron beam in cathode ray tubes
US3154710A (en) * 1958-11-13 1964-10-27 Motorola Inc Cathode-ray display system having electrostatic magnifying lens
US3289034A (en) * 1961-05-24 1966-11-29 Philips Corp Cathode-ray tube having an auxiliary electrode between the control grid and the anode electrode
US3320458A (en) * 1962-01-18 1967-05-16 Nippon Electric Co Cathode ray tubes employing a novel convergent electrostatic lens system for beam modulation

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Publication number Publication date
GB516786A (en) 1940-01-11
NL53220C (en(2012))

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