EP0106092A1 - Tube à rayons cathodiques - Google Patents

Tube à rayons cathodiques Download PDF

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Publication number
EP0106092A1
EP0106092A1 EP83108643A EP83108643A EP0106092A1 EP 0106092 A1 EP0106092 A1 EP 0106092A1 EP 83108643 A EP83108643 A EP 83108643A EP 83108643 A EP83108643 A EP 83108643A EP 0106092 A1 EP0106092 A1 EP 0106092A1
Authority
EP
European Patent Office
Prior art keywords
ray tube
cathode ray
electron beam
phosphor screen
permanent magnet
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.)
Withdrawn
Application number
EP83108643A
Other languages
German (de)
English (en)
Inventor
Masamichi Kimura
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electronics 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
Priority claimed from JP15847582A external-priority patent/JPS5949135A/ja
Priority claimed from JP20815782A external-priority patent/JPS5998441A/ja
Application filed by Matsushita Electronics Corp filed Critical Matsushita Electronics Corp
Publication of EP0106092A1 publication Critical patent/EP0106092A1/fr
Withdrawn legal-status Critical Current

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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
    • H01J29/84—Traps for removing or diverting unwanted particles, e.g. negative ions, fringing electrons; Arrangements for velocity or mass selection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/44—Factory adjustment of completed discharge tubes or lamps to comply with desired tolerances
    • H01J9/445—Aging of tubes or lamps, e.g. by "spot knocking"

Definitions

  • the present invention relates to a cathode ray tube, and more particularly to a cathode ray tube for power saving type small picture tube and method of making the same.
  • a miniature . type cathode ray tube having a small face panel of 1.5 inch or 1 inch or the like diagonal line is generally used.
  • Such small type cathode ray tube is, in most cases driven by battery, Accordingly it is desirable to be operated efficiently with a very small power consumption.
  • the anode voltage can be lowered by making the thickness of aluminum vacuum deposited layer of the metal back layer very thin. But, even when the thickness is halved from the ordinary one to 0.03 ⁇ m for instance, for an anode voltage of 2 KV, the screen face brightness in comparison with that of the cathode ray tube without the metal back layer becomes almost halved and is insufficient.
  • the electrostatic deflection type cathode ray tube not only electron beam but also ion beam are deflected, and accordingly there is no fear that the ion beam is focused at a center on the phosphor screen.
  • the electromagnetic deflection type cathode ray tube the electron beam is deflected but the ion beam is not deflected, accordingly the ion beam-is focused on the central part of the screen, thereby resulting in ion-burning.
  • the electromagnetic focusing the ions are not focused substantially, therefore in the central part of the phosphor screen, the ions are not centered, and accordingly there is no fear of ion-burning of the phosphor screen. Accordingly, the ion-burning is the problem only in the electrostatic focusing type and electromagnetic deflection type cathode ray tube only.
  • the cathode ray tube initiate operation
  • the residual gas in the tube is ionized by the electron beam, and most of same are adsorbed by getter film which is formed on the inner wall of the tube by vapor deposition of the getter material.
  • getter film which is formed on the inner wall of the tube by vapor deposition of the getter material.
  • further gas accumulates, and accordingly the vacuum in the enclosure rapidly decreases as shown in FIG. 1. Accordingly, the ion-burning of the phosphor film is likely to be made at rather initial stage of operation.
  • Primary purpose of the present invention is to provide an improved cathode ray tube which does not have a metal back layer and still is free from ion-burning.
  • a cathode ray tube in accordance with the present invention comprises
  • a vacuum enclosure having a transparent face panel
  • a cathode ray tube in accordance with the present invention comprises a vaccum enclosure having a transparent face panel and an electrostatic focusing type.
  • electron gun and a phosphor screen formed on the inner wall of said face panel directly facing said electron gun without an overriding metal back layer.
  • the electron gun has a permanent magnet for forming substantially uniform static magnetic field, which is substantially parallel with axis of the cathode ray tube, (i.e., axis of electron beam) and disposed between said cathode and a deflection part of the cathode ray tube.
  • Method of making cathode ray tube in accordance with the present invention is characterized in that in the manufacturing a defocused electron beam is emitted from the electron gun for a predetermined time in aging at the initial stage before actual service of the cathode ray tube, thereby positively producing ions in the evacuated enclosure, so that the ions are adsorbed by getter mirror layer, evading concentration of the ion beam bombardment on a small spot in the central part of the phosphor screen.
  • electrostatic focusing type electron gun 3 is sealed in an evacuated enclosure 1 such as of glass having a transparent face panel 10 and a tubular neck part 2.
  • the electron gun comprises a cathode 4, a control grid 5, an acceleration electrode 6, a focusing electrode 7, and anode 8.
  • conductive coating 12 on the inner face of a cone part between the face panel 10 and the neck part 2 is electrically connected to the anode 8.
  • a short tubular permanent magnet 9 is provided in a coaxial relation with axis of the tube, i.e., axis of the electron gun or ion beam, and the permanent magnet 9 is magnetized to have a static and preferably uniform magnetic field,which is in coaxial relation with the electron beam and has a substantially uniform distribution for the space where the electron beam passes.
  • the permanent magnet has substantially ring-shaped poles which are disposed apart in a direction of the electron beam and each ring-shaped poles are disposed substantially coaxially with said electron beam.
  • the face panel 10 has on its inner wall a phosphor screen 11, but has no metal back layer thereon. Therefore, the phosphor screen 11 faces directly to the electron gun 3 without a metal back layer inbetween.
  • the electron beam which is of course modulated by a video signal given across the control grid 5 and the cathode 4, is focused by the electrostatic focusing type electron lens, and then deflected by known deflection yoke 13 applied on the neck part of the tube, where horizontal and vertical deflection magnetic fields are applied, thereby to produce a monochrome video picture on the phosphor screen 11.
  • the electron beam issued from the cathode 4 is preliminarily converged by the known magnetic lens produced by the tubular permanent magnet 9, and further is converged by the known electrostatic lens constituted with the acceleration electrode, focusing electrode 7 and anode 8. That is, the modulated electron beam is twice converged by means of the magnetic convergence lens consisting of the permanent magnet 9 and the above-mentioned electrostatic lens cooperatively.
  • anions generated around a. cross-over point are converged like the electron beam by the electrostatic lens, but the former have a large mass and therefore receive substantially no effect of the magnetic fields. Accordingly, the anions are converged insufficiently and do not form a sharp focused point at the center of the phosphor screen when not deflected. but produce a scattered defocused image on the phosphor screen 11, thereby resulting in-a low concentration of bombardment energy at the phosphor screen.
  • FIG. 2 schematically shows electron beam path.
  • solid lines show electron beam path which is converged both by the magnetic lens constituted by the permanent magnet 9 and the electrostatic lens 3' cooperatively is focused sharply on one point P of the phosphor screen 11, but.on the other hand the anion beam 17 shown by dotted lines is converged only by the electrostatic lens 16. Accordingly, the ion beam is not sufficiently converged on a point P of the phosphor screen 11 but dispersed on a broader area B on the phosphor screen 11 as shown by dotted lines. Accordingly, in this example even though the metal back layer is not formed on the phosphor screen 11, no ion-burning is produced by the anion beam.
  • the permanent magnet 9 for producing the axial magnetic field may be disposed not only inside the convergence electrode 7 but also outside it, and in general the permanent magnet 9 to produce the static axial magnetic field is to be disposed between the cathode ion and the region of magnetic deflection of the electron beam, i.e., the region of the deflection yokes.
  • the inventors trially produced a small type cathode ray tube having a face plate of 25.4 mm diagonal size embodying the present invention.
  • the tubular permanent maget has about 70 Gauss magnetic field lens, and a beam spot of about 0.15 mm diameter is obtained on the phosphor screen.
  • the diameter of the beam spot became about 1.5 mm, and accordingly the diameter of the ion spot was assumed of this size, that is about 10 times as large as the electron beam spot. This means that the ion spot of 10 times diameter has about 100 times area.
  • a cathode ray tube has a phosphor screen of about 25.4 mm diagonal size is made by using a phosphor of Y 2 0 2 S:Tb and provided with a bi-potential type electron gun but without a metal back layer.
  • the cathode ray tube has a designed ratings of last stage acceleration electrode potential Eb of about 2.0 KV, focusing electrode voltage Ec 3 of about 0.3 KV, and beam spot diameter of about 0.3 mm.
  • the vaccum in the enclosure is improved.
  • the electron beam is not necessarily deflected for the small type cathode ray tube, but the defocused aging should be carried out at least for about 1 hour, preferably more than two hours, so that ion-burning after initiation of service under the desinged rating is drastically decreased.
  • undesirable ion-burning of phosphor can be substantially eliminated, and a stable small type cathode ray tube of low power consumption is obtainable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
EP83108643A 1982-09-10 1983-09-01 Tube à rayons cathodiques Withdrawn EP0106092A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP158475/82 1982-09-10
JP15847582A JPS5949135A (ja) 1982-09-10 1982-09-10 受像管の製造方法
JP20815782A JPS5998441A (ja) 1982-11-27 1982-11-27 陰極線管
JP208157/82 1982-11-27

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP86108224.6 Division-Into 1983-09-01

Publications (1)

Publication Number Publication Date
EP0106092A1 true EP0106092A1 (fr) 1984-04-25

Family

ID=26485579

Family Applications (2)

Application Number Title Priority Date Filing Date
EP83108643A Withdrawn EP0106092A1 (fr) 1982-09-10 1983-09-01 Tube à rayons cathodiques
EP86108224A Withdrawn EP0206216A1 (fr) 1982-09-10 1983-09-01 Tube à rayons cathodiques

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP86108224A Withdrawn EP0206216A1 (fr) 1982-09-10 1983-09-01 Tube à rayons cathodiques

Country Status (1)

Country Link
EP (2) EP0106092A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202023000986U1 (de) 2023-05-04 2023-11-23 Kolja Kuse Solardach

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4940440A (en) * 1987-02-27 1990-07-10 North American Philips Corporation Weak beam scanning of cathode ray tubes
US5932957A (en) * 1997-04-18 1999-08-03 Thomson Consumer Electronics, Inc. Cathode-ray tube having detentioning rod assembly for a tension mask frame

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB480948A (en) * 1936-07-25 1938-02-25 Frederick Hermes Nicoll Improvements in or relating to cathode ray tubes
US2555850A (en) * 1948-01-28 1951-06-05 Nicholas D Glyptis Ion trap
FR1036378A (fr) * 1950-05-02 1953-09-07 Philips Nv Tube récepteur de télévision
GB2076216A (en) * 1980-05-16 1981-11-25 Hitachi Ltd Method of fabricating cathode-ray tube

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5652839A (en) * 1979-10-05 1981-05-12 Hitachi Ltd Aging method for picture tube

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB480948A (en) * 1936-07-25 1938-02-25 Frederick Hermes Nicoll Improvements in or relating to cathode ray tubes
US2555850A (en) * 1948-01-28 1951-06-05 Nicholas D Glyptis Ion trap
FR1036378A (fr) * 1950-05-02 1953-09-07 Philips Nv Tube récepteur de télévision
GB2076216A (en) * 1980-05-16 1981-11-25 Hitachi Ltd Method of fabricating cathode-ray tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202023000986U1 (de) 2023-05-04 2023-11-23 Kolja Kuse Solardach

Also Published As

Publication number Publication date
EP0206216A1 (fr) 1986-12-30

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE GB

17P Request for examination filed

Effective date: 19840705

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19870324

RIN1 Information on inventor provided before grant (corrected)

Inventor name: KIMURA, MASAMICHI