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US2803781A - Device comprising a cathode-ray tube - Google Patents

Device comprising a cathode-ray tube Download PDF

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Publication number
US2803781A
US2803781A US362702A US36270253A US2803781A US 2803781 A US2803781 A US 2803781A US 362702 A US362702 A US 362702A US 36270253 A US36270253 A US 36270253A US 2803781 A US2803781 A US 2803781A
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US
United States
Prior art keywords
electrode
cathode
electron
shifting
parallel
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
US362702A
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English (en)
Inventor
Jurgens Benno Frederik
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.)
US Philips Corp
North American Philips Co Inc
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US Philips 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 US Philips Corp filed Critical US Philips Corp
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Publication of US2803781A publication Critical patent/US2803781A/en
Anticipated expiration legal-status Critical
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Classifications

    • 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
    • H01J29/72—Arrangements for deflecting ray or beam along one straight line or along two perpendicular straight lines
    • 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

Definitions

  • This invention relates to cathode-ray tubes, more particularly, to cathode-ray tubes which exhibit a linear relationship between the deilecting signal and the actual beam deflection.
  • Some cathode-ray tubes comprise a pair of planar electrodes at the window end, between which an electrostatic field is produced for the purpose of dellecting a beam of electrons.
  • One of these electrodes is a collecting electrode, and the other, which is parallel to and in front of the collecting electrode, may be in the form of a grid, or be constituted by a thin metal skin allowing the passage of electrons.
  • An electrostatic field can be produced between the electrodes by applying suitable voltages thereto, the main direction of the lines of force being directed substantially at right angles to the surfaces of the two electrodes.
  • Such an electrode system is useful to obt-ain the so-called post-acceleration of the electron beam.
  • a further use is found in the production of television color images, in which the electron-permeable electrode is in the form of a grid parallel to the collecting electrode and a luminescent screen, which is divided into lines or points depending upon the type of television system employed.
  • An electron-beam entering the above-described electrostatic iield between the two electrodes at an angle with the lines of force is subject to a force making an angle with the direction of incidence, the electron beam thereby being deiiected along a curved path.
  • This deflection results in a large deviation from the desired linear relationship between the shift of the point of impact of the electron beam, and the deflecting voltage or current which causes said shift, which deviation is dependent upon the angle between the direction of incidence of the electron beam and the lines of force and, hence, the extent of deflection. Since the deflection varies for different areas of the collecting electrode, so does the deviation vary.
  • the present invention has as its object to provide means for correcting the non-linear relationship, resulting from the above-mentioned deviation, between the shift of the point of the impact of the electron beam and the deflection voltage or current.
  • a device comprises a cathode-ray tube having an electrode system which comprises an electron gun including at least a cathode and an accelerating electrode, a substantially planar collecting electrode, an electron-permeable electrode arranged in front of the collecting electrode parallel therewith, an electrostatic eld being produced between the latter electrodes, and means for deflecting an electron beam to scan the collecting electrode, which may be either electrostatic or electromagnetic.
  • shifting means for producing a iield to shift or displace the electron beam parallel to itself and in the plane of deflection, which means are coupled to the deiiecting means in a ⁇ manner such that the deflection of the electron beam is counteracted by the deflection due to the ⁇ eld produced between the collecting electrode and the electron-permeable electrode arranged in front thereof.
  • the deilection should be adjusted so that there will result a complete compensation of the deviation. However, in certain cases, partial compensation will be adequate.
  • a shift of the electron beam parallel to itself may be effected in a simple manner by providing a pair of deilection fields which are identical, but oppositely directed, and which are provided in front of the iieid produced by the deilecting means.
  • Such identical elds of opposite direction may be produced by either two pairs of deflection plates arranged after one another and interconnected in a crosswise manner, or two sets of magnetic coils traversed by current in opposite senses.
  • the shifting means for the electron beam should be coupled to the deflecting means.
  • a coupling need not be a direct galvanic connection, but may include a network for bringing about the desired relationship between the deflection voltage or current and the voltage or current applied to the members for shifting the electron beam.
  • a network may include, for example, cathode-ray tubes, resistors, capacitors, transistors and other elements.
  • the electrostatic or deflecting field between the collecting electrode and the electron-permeable electrode is produced by a voltage difference, and the collecting electrode has a positive potential relative to the other electrode, the electron beam, before entering the electrostatic or deilecting field, should be shifted in the same sense as the deection itself. lf the collecting electrode has a negative potential relative to the electron-permeable electrode in front thereof, the shift should be eifected in the opposite sense.
  • pro ⁇ viding the shifting means according to the invention is a much simpler method for obviating the diiiiculty.- ⁇ Cor-l rection in a direction parallel to the color lines is not i ⁇ Patented uxg. 20, 1957Y accelerating electrode 3, and a conventionalv deection necessary since, with slight non-linearity, there willY belno change in color, but at most, relatively snialldistortionV ofthe image. Y
  • the invention is vapplicable to both the cathode-ray tubes containing. alumineseent screen, .andf tubes -crmtaining aplurality offanodes, thefsofcalled. switchingtubes. .
  • The'invention will now bedescribed Y'with .reference .tov the aceompanying' drawing'yin which:A C Y Fig. l shows diagrammatically a Conventional cathoderay tubeA without the vshifting .means according to the.-v
  • a Fig. 2. shows, on ,anv enlarged scale, adetail of ⁇ the tube shoWninTig; le; ⁇ Y, I.
  • Figl 3 shows'V diagrammatically an. electrodey system for4 ⁇ shifting.:an electron Vbeam; f
  • Eijg.5 is La View, similarto Fig. 4 of a modification
  • Fig. z6VV showsA diagrammaticrallyv part of'a ⁇ cathode-ray.l 'tube adapted vfor reproducingtelevision color images.
  • a cathode-ray tube 1 cornprisesran electrodeV systemy includingV a cathode 2, ⁇ an ⁇ system constituted by plates 4 and 5, which may be referred to as a first deecting means.
  • a planar, con- Cil Fig; '3- shows, diagrammatically, one form of deflec-VY tion system according to the invention, in which in front of a lpairY of .coriven't'i'onal of rs't rdefiecting members and 16, there Vis provided an additional electrode sys- .tem in order to shift or displace the electronbeam parallel to itself and in the plane of the deflection eifected by the electrodes V15 andv 16.
  • This electrode systemV is constituted'bry two pairsT of successively-arranged deilection electrodes 17, 18, j19, '20, the electrodes 17, 20
  • the Y electron-permeable electrode is provided in -front of the- Y collecting electrode 6 and parallel therewith.
  • a voltage difference provided by a Voltage source 8 is appliedbe,- tween the electrodes 6 and 7 such that the electrode 6 has a positive potential relative to the electrodep7.
  • the direction' ofthe beam upon.emerging-from*thesystem- 18, 20 isthe ⁇ refore Y parallel to thedirection'fof originalbeam, but' is no longer located on the Yaxis,.but atthe position 23.
  • Fig. 4v shows a device according to the invention in. which ,the scanning 'deection is eiected Vby sets ofmagnetic coils 25, 26, shown diagrammatically.-
  • the set of coils 25 is providedyat the cathode side, 'with two smallsets of coils 29,'30'whieh are .eonstructedV and ⁇ connected so thatthe Y'c l'etlection brought about by: the set of coils iscorrected.
  • Fig'. -6 shows a cathode-raytube ⁇ adapted for reproduit Y I ingtel'evisitmY color images.
  • the electrode systemfof this tube comprises ascreen l31 'constituted by strips of mate-V rial"32'whieh become .luminescent inV different colors"V upon bombardment by electrons.V vIn front of theV electrede 311is'provided agrid 33 consisting of paralleli wires 34. ⁇ vIn order Vto, scan the/whole, screen 31, the beam 35v should be deected in a directionparallel to the grid wires'34 and ina direction at rightv angles thereto. For this purpose, use Vis made of sets of coils 36, 37,. respectively.
  • correcivon ofthe-,deection parallel to the-direction of the grid' wires is also desired, it is jp.ossible"to"provide two further' sets ⁇ of; coils .for shifting thebeam parallel withV ,thedirectionxof the grid wires.
  • the grid in front of the collecting electrode may, alternatively, be used for electing so-called post-acceleration.
  • use may be made of, instead of a grid, one or more annular electrodes commonly provided on the wall of the tube; in such a system, it is also possible to shift the point of impact of the beam on the collecting electrode by employing correcting members as described above.
  • the invention is not limited to the embodiments described, but is applicable to any device containing a cathode-ray tube having a collecting electrode and an electron-permeable electrode in front thereof.
  • the electron-permeable electrode 43 it is possible, or example, for the electron-permeable electrode 43 to be a thin, metal skin as shown in Fig. 5, or for the collecting electrode as well as the electrode in front thereof to be arranged in an inclined position with respect to the axis of the electrode system, which serves to produce and deflect the cathoderay.
  • a conductive electrode either before or after the screen, to which electrode the required voltage is applied instead of being applied to the screen itself.
  • a device comprising a cathoderay tube, said tube having an electrode system including a cathode, an accelerating electrode, a substantially planar, collecting electrode, and an electron-permeable electrode arranged in front of the collecting electrode and parallel therewith, first means for dellecting an electron beam disposed between the accelerating electrode and the electron-permeable electrode, means disposed in front of the rst dellecting means for shifting the electron beam parallel to itself and in the plane of deflection, means for maintaining an electrostatic eld between the permeable electrodes and at w 'ch a beam incident obliquely thereto is subject to a second deflection in one direction, and means interconnecting the shifting and rst deilecting means in such manner that the value of said rst detlection produced when a signal is applied to said rst dellecting means determines the magnitude of the shift produced by the shifting means in a direction opposite to said one direction, substantially to compensate for the second deflection produced by the electro
  • a device as claimed in claim l in which the electron permeable electrode is in the form of a grid.
  • a device as claimed in claim means include means producing a tlection fields which are identical in sitely directed and transverse to the 5.
  • a device as claimed in claim ing means is constituted by two sets current in opposite senses.
  • An arrangement including a cathode-ray tube; said tube having an electrode system including at least a cathode, an accelerating electrode, an electron-permeable electrode, and a planar collecting electrode parallel to said permeable electrode arranged in that order; tirst means for deecting an electron beam disposed between the accelerating electrode and the permeable electrode, shifting means disposed in front of said rst detlecting means for shifting the electron beam parallel to itself and in the plane of dellection produced by said rst deilecting means, said shifting means including two pairs of successively-arranged deection electrodes intercon- 1 in which the shifting pair of successive demagnitude and oppobeam direction.
  • An arrangement including a cathode-ray tube; said tube having an electrode system including at least a cathode, an accelerating electrode, an electron-permeable electrode, and a planar collecting electrode parallel to said permeable electrode arranged in that order; rst means for deilecting an electron beam disposed between the accelerating electrode and the permeable electrode, shifting means disposed in front of said first dellecting means for shifting the electron beam parallel to itself and in the plane of deilection produced by said deilecting means, said shifting means including two pairs of successively-arranged deflection electrodes interconnected in a cross-wise manner, means maintaining the collecting electrode at a negative potential relative to the permeable electrode to thereby detlect the beam in one direction, and means connecting the pair of dellection electrodes closer to said cathode in anti-parallel with the first detlecting means to shift the beam in a direction opposite to said one direction, said shifting and deilecting means producing deilections in the same direction.
  • a device comprising a cathoderay tube, said tube having an electrode system including, in order, a cathode, an accelerating anode, an electron-permeable, conductive electrode, and a substantially planar, conductive, co1- lecting electrode spaced from and arranged parallel with the electron-permeable electrode, means for maintaining a potential dilerence between the electron-permeable and collecting electrodes to thereby establish an electric tield therebetween whereby an electron beam intercepting said eld at an angle thereto will be subject to a second dellecton in a given direction, first deilecting means mounted between said electron-permeable electrode and said accelerating anode for causing an electron beam produced by said cathode to scan said collecting electrode, shifting means disposed between dellecting means and producing a pair of adjacent, successive, opposing elds for causing said beam to be displace parallel to itself and in a direction always opposite to said given direction, and means interconnecting said shifting and first delecting means whereby the magnitude of the
  • the electronpermeable electrode is a grid comprising solely parallel wires
  • the collecting electrode is a screen covered with strips of material which become luminescent in different colors and extend parallel to the ⁇ grid wires
  • the shifting means are arranged to effect a shift in a direction at right angles to the direction of the grid wires so that the image of the grid on the collecting electrode in this direction is congruent to the grid.

Landscapes

  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
US362702A 1952-08-13 1953-06-19 Device comprising a cathode-ray tube Expired - Lifetime US2803781A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL746777X 1952-08-13

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US (1) US2803781A (pt)
BE (1) BE522075A (pt)
DE (1) DE975071C (pt)
FR (1) FR1088280A (pt)
GB (1) GB746777A (pt)
NL (1) NL171800B (pt)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2921228A (en) * 1954-05-18 1960-01-12 Itt Color television apparatus
US2927236A (en) * 1955-10-21 1960-03-01 Scient Lab Developments Inc Television picture tube
US2938142A (en) * 1955-04-01 1960-05-24 Kendon Electronics Inc Control of color television systems of the cathode ray tube type
US2982917A (en) * 1958-04-10 1961-05-02 Aaland Kris Method and apparatus for pulsing a charged particle beam
US3444421A (en) * 1965-12-27 1969-05-13 Sony Corp Cathode ray tube
US3657593A (en) * 1968-04-03 1972-04-18 John Robert Garrood Electron microscopy
EP0085238A2 (en) * 1982-01-19 1983-08-10 Hewlett-Packard Company Penetration cathode ray tubes
US4585976A (en) * 1982-01-19 1986-04-29 Hewlett-Packard Company Beam penetration CRT with internal automatic constant deflection factor and pattern correction
US20170229281A1 (en) * 2014-10-28 2017-08-10 National Institutes For Quantum And Radiological Science And Technology Charged particle beam irradiation apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2117965A (en) * 1982-02-05 1983-10-19 Philips Electronic Associated Electron beam deflector for a flat display tube

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2118867A (en) * 1932-07-20 1938-05-31 Schlesinger Kurt Television arrangement
US2332622A (en) * 1941-10-11 1943-10-26 Bell Telephone Labor Inc Electron discharge device
US2581487A (en) * 1950-03-01 1952-01-08 Rca Corp Color television reproduction tube
US2587074A (en) * 1948-09-29 1952-02-26 Rca Corp Color television image reproducing system
US2606303A (en) * 1951-02-17 1952-08-05 Bramley Jenny Color television tube and process
US2634380A (en) * 1950-11-17 1953-04-07 Rca Corp Cathode-ray tube

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE579207C (de) * 1927-08-09 1933-06-27 Ernst Harald Norinder Dr Kathodenstrahloszillograph
DE689991C (de) * 1933-07-22 1940-04-11 Manfred Von Ardenne Verfahren zur Beseitigung des Nullpunktfehlers bei Braunschen Roehren
DE696536C (de) * 1933-10-23 1940-09-24 Loewe Opta Gmbh Ablenkplattensystem fuer Kathodenstrahlroehren
US2454378A (en) * 1945-05-28 1948-11-23 Rca Corp Cathode-ray tube apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2118867A (en) * 1932-07-20 1938-05-31 Schlesinger Kurt Television arrangement
US2332622A (en) * 1941-10-11 1943-10-26 Bell Telephone Labor Inc Electron discharge device
US2587074A (en) * 1948-09-29 1952-02-26 Rca Corp Color television image reproducing system
US2581487A (en) * 1950-03-01 1952-01-08 Rca Corp Color television reproduction tube
US2634380A (en) * 1950-11-17 1953-04-07 Rca Corp Cathode-ray tube
US2606303A (en) * 1951-02-17 1952-08-05 Bramley Jenny Color television tube and process

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2921228A (en) * 1954-05-18 1960-01-12 Itt Color television apparatus
US2938142A (en) * 1955-04-01 1960-05-24 Kendon Electronics Inc Control of color television systems of the cathode ray tube type
US2927236A (en) * 1955-10-21 1960-03-01 Scient Lab Developments Inc Television picture tube
US2982917A (en) * 1958-04-10 1961-05-02 Aaland Kris Method and apparatus for pulsing a charged particle beam
US3444421A (en) * 1965-12-27 1969-05-13 Sony Corp Cathode ray tube
US3509416A (en) * 1965-12-27 1970-04-28 Sony Corp Cathode ray tube
US3657593A (en) * 1968-04-03 1972-04-18 John Robert Garrood Electron microscopy
EP0085238A2 (en) * 1982-01-19 1983-08-10 Hewlett-Packard Company Penetration cathode ray tubes
EP0085238A3 (en) * 1982-01-19 1985-07-17 Hewlett-Packard Company Cathode ray tubes
US4585976A (en) * 1982-01-19 1986-04-29 Hewlett-Packard Company Beam penetration CRT with internal automatic constant deflection factor and pattern correction
US20170229281A1 (en) * 2014-10-28 2017-08-10 National Institutes For Quantum And Radiological Science And Technology Charged particle beam irradiation apparatus
US10090132B2 (en) * 2014-10-28 2018-10-02 National Institutes For Quantum And Radiological Science And Technology Charged particle beam irradiation apparatus

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Publication number Publication date
GB746777A (en) 1956-03-21
BE522075A (pt)
DE975071C (de) 1961-08-03
FR1088280A (fr) 1955-03-04
NL171800B (nl)

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