EP0293854A1 - Système de canons à électrons - Google Patents

Système de canons à électrons Download PDF

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Publication number
EP0293854A1
EP0293854A1 EP88108762A EP88108762A EP0293854A1 EP 0293854 A1 EP0293854 A1 EP 0293854A1 EP 88108762 A EP88108762 A EP 88108762A EP 88108762 A EP88108762 A EP 88108762A EP 0293854 A1 EP0293854 A1 EP 0293854A1
Authority
EP
European Patent Office
Prior art keywords
opening
grid electrode
extension
electrode
electron gun
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.)
Granted
Application number
EP88108762A
Other languages
German (de)
English (en)
Other versions
EP0293854B1 (fr
Inventor
Helmut Kimmel
Hans Dr. Reule
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.)
Nokia Deutschland GmbH
Original Assignee
Nokia Deutschland GmbH
Nokia Graetz GmbH
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 Nokia Deutschland GmbH, Nokia Graetz GmbH filed Critical Nokia Deutschland GmbH
Publication of EP0293854A1 publication Critical patent/EP0293854A1/fr
Application granted granted Critical
Publication of EP0293854B1 publication Critical patent/EP0293854B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/48—Electron guns
    • H01J29/488—Schematic arrangements of the electrodes for beam forming; Place and form of the elecrodes
    • 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
    • H01J29/48—Electron guns
    • H01J29/50—Electron guns two or more guns in a single vacuum space, e.g. for plural-ray tube
    • H01J29/503—Three or more guns, the axes of which lay in a common plane

Definitions

  • the invention relates to an electron gun system for cathode ray tubes according to the preamble of claim 1.
  • Electron beam generator systems for cathode ray tubes which have a cathode and grid and focusing electrodes, are known (DE-OS 32 12 248).
  • DE-OS 32 12 248 Electron beam generator systems for cathode ray tubes, which have a cathode and grid and focusing electrodes, are known (DE-OS 32 12 248).
  • the second grid electrode In order to achieve a thin electron beam and thus a small electron impact spot on the fluorescent screen of the cathode ray tube, it is necessary to make the second grid electrode relatively thick. That is, the depth of the opening in the second grid electrode should be large. It is entirely possible that the depth of the opening corresponds to the diameter of the opening.
  • the electron beam expands and thereby strikes the wall of the opening in the second grid electrode.
  • the electrons grazing the wall of the opening in the second grid electrode in turn trigger secondary electrons which reach the third electrode, also called the focusing electrode.
  • Such leakage currents are initially immeasurably small, but with increasing operating time, currents that can be measured briefly in the ⁇ A range at the second and third grid electrodes result because precipitation of vaporized cathode material in the opening of the second grid electrode results in the secondary electron yield of initially approx. 1 multiplied.
  • the invention has for its object to provide an electron gun for cathode ray tubes with a thick second grid electrode, which has no image blur due to current transfer through the second and third electrodes.
  • cathode ray tube 10 with a screen 11, a cone 12 and a tube neck 13.
  • cathode ray tubes with one and also with several electron gun systems. In the case of cathode ray tubes with a plurality of electron gun systems, these can be separated from each other, but also be integrated. The invention relates to all these forms of electron gun systems, even if the invention is explained using an integrated multi-beam electron gun system.
  • an electron gun system 14 is attached (shown in broken lines), which for example generates three electron beams 1, 2, 3, which are deflected via the screen 11 (1 ', 2', 3 ').
  • a magnetic deflection system 15 is arranged at the transition from the tube neck to the cone 12.
  • the system 14 has first and second grid electrodes 23, 24, first and second focusing electrodes 25, 26 and a convergence pot 27 as seen in the beam direction.
  • Cathodes 22 are arranged within the first grid electrode 23 and are shown only schematically and in broken lines.
  • the first grid electrode 23 is also called the control grid and the second grid electrode 24 is also called the screen grid.
  • the cathode together with the control and shield grids is called a triode lens.
  • the focusing electrodes 25, 26 form a focusing lens.
  • the individual parts of the system are held together by two glass rods 28.
  • the electrical connections of the system 14 are not shown for the sake of clarity.
  • Fig. 3 only the second grid electrode 24 is shown in section.
  • the first focusing electrode 25 is indicated above this.
  • the grid electrode 24 is cup-shaped here and in the bottom 5 there is the opening 4 for the electron beam.
  • the other openings for the further electron beams are not visible in this sectional view.
  • the opening 4 has a great depth, i.e. its diameter d corresponds approximately to the thickness of the base 5 of the second grid electrode 24.
  • the opening 4 is provided with a conical extension 6.
  • the conical extension 6 does not have to extend over the entire depth of the opening 4.
  • the opening 4 has a depth a in which its side walls run parallel to the central axis of the opening 4. This is followed by the conical extension 6.
  • the conical extension has an angle ⁇ of at least 10 °, for example 15 °. For the relationship of the diameter d to the depth a of the opening 4, the condition applies a d ⁇ 0.5 is fulfilled.
  • the second grid electrode 24 is made of a thin sheet.
  • the opening was designed as a passage.
  • the conical extension 6 includes an angle ⁇ of at least 10 ° and that the relationship a d ⁇ 0.5 is fulfilled.
  • FIG. 6 shows a third exemplary embodiment of a second grid electrode 24.
  • This second grid electrode has a cup-shaped shape and in the bottom 7 there is the rectangular opening 4.
  • a plate 8 on the bottom 7 which contains an opening with a conical extension 6. Due to this structural design of the second grid electrode 24, it is easily possible to combine an astigmatic beam shaping element in the grid electrode 24 with the plate 8 containing the conical extension 6.
  • FIGS. 7a and 7b The details X and Y from FIG. 6 are shown in FIGS. 7a and 7b.
  • the details X and Y represent two cuts through the grid electrode 24 offset by 90 °.
  • the plate 8 In the plate 8 there is a rotationally symmetrical opening, consisting of the cylindrical part with the depth a and the conical extension 6.
  • the extension in turn has an angle ⁇ of at least 10 °.
  • the conical extension does not extend over the entire depth of the opening, but passes into the part whose depth is denoted by a and whose side walls run parallel to the central axis of the opening 4.
  • the condition is also here a d ⁇ 0.5 must be fulfilled.
  • the depth of the opening 4 in the base 7 is denoted by b, the width by e and the length by f, and this part of the opening acts as an astigmatic beam hole.
  • the extension 6 is carried out in stages and its depth is denoted by c.
  • the grid electrode 24 can have a pot-shaped shape and carry the opening 4 in its base 7.
  • the plate 8 which has an opening with a diameter d1 (FIG. 9), is then aligned. having. This diameter d1 is larger than the diameter do of the opening in the bottom 7, whereby the step extension 6 is created.
  • the condition d1 do + 2c.tan ⁇ should be fulfilled, where ⁇ ⁇ 10 °.
  • FIG. 9 The detail X from FIG. 8 is shown in FIG. 9.
  • a rectangular opening can be present in the bottom 7, which acts as an astigmatic beam hole.

Landscapes

  • Electrodes For Cathode-Ray Tubes (AREA)
  • Cold Cathode And The Manufacture (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
EP88108762A 1987-06-05 1988-06-01 Système de canons à électrons Expired - Lifetime EP0293854B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873718838 DE3718838A1 (de) 1987-06-05 1987-06-05 Elektronenstrahlerzeugersystem
DE3718838 1987-06-05

Publications (2)

Publication Number Publication Date
EP0293854A1 true EP0293854A1 (fr) 1988-12-07
EP0293854B1 EP0293854B1 (fr) 1993-12-15

Family

ID=6329114

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88108762A Expired - Lifetime EP0293854B1 (fr) 1987-06-05 1988-06-01 Système de canons à électrons

Country Status (5)

Country Link
US (1) US4942334A (fr)
EP (1) EP0293854B1 (fr)
JP (1) JP3065620B2 (fr)
CA (1) CA1296048C (fr)
DE (2) DE3718838A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5847500A (en) * 1995-03-02 1998-12-08 Hitachi, Ltd. Electron gun for color cathode ray tube and method of manufacturing the electron gun electrode
JP2001250491A (ja) * 2000-03-07 2001-09-14 Hitachi Ltd Ｕｐｆ型電子銃を有する陰極線管
US6833680B2 (en) * 2002-02-28 2004-12-21 Lg. Philips Displays Korea Co., Ltd. Structure of electron gun for color cathode ray tube

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3914641A (en) * 1971-11-23 1975-10-21 Adrian W Standaart Electron gun construction for multi-beam color cathode ray tube
DE3117281A1 (de) * 1980-04-30 1982-03-04 RCA Corp., 10020 New York, N.Y. "verfahren zum herstellen einer gitterelektrode fuer eine kathodenstrahlroehre"
EP0247470A2 (fr) * 1986-05-23 1987-12-02 Nokia (Deutschland) GmbH Dispositif générateur de faisceau d'électrons

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3295001A (en) * 1963-06-04 1966-12-27 Sylvania Electric Prod Cathode ray tube gun having a second grid with an effective thickness
US4234814A (en) * 1978-09-25 1980-11-18 Rca Corporation Electron gun with astigmatic flare-reducing beam forming region
US4514659A (en) * 1982-03-04 1985-04-30 Rca Corporation Inline electron gun for high resolution color display tube
US4500808A (en) * 1982-04-02 1985-02-19 Rca Corporation Multibeam electron gun with composite electrode having plurality of separate metal plates
JPS58175244A (ja) * 1982-04-05 1983-10-14 Mitsubishi Electric Corp 陰極線管
US4535266A (en) * 1983-05-02 1985-08-13 North American Philips Consumer Electronics Corp. In-line electron gun structure for color cathode ray tube having tapered walls and elongated apertures for beam spot-shaping
US4520292A (en) * 1983-05-06 1985-05-28 Rca Corporation Cathode-ray tube having an asymmetric slot formed in a screen grid electrode of an inline electron gun
US4523123A (en) * 1983-05-06 1985-06-11 Rca Corporation Cathode-ray tube having asymmetric slots formed in a screen grid electrode of an inline electron gun
JPS61181043A (ja) * 1985-02-06 1986-08-13 Toshiba Corp 陰極線管用電子銃
JPS61193340A (ja) * 1985-02-22 1986-08-27 Toshiba Corp 陰極線管用電子銃
US4608515A (en) * 1985-04-30 1986-08-26 Rca Corporation Cathode-ray tube having a screen grid with asymmetric beam focusing means and refraction lens means formed therein

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3914641A (en) * 1971-11-23 1975-10-21 Adrian W Standaart Electron gun construction for multi-beam color cathode ray tube
DE3117281A1 (de) * 1980-04-30 1982-03-04 RCA Corp., 10020 New York, N.Y. "verfahren zum herstellen einer gitterelektrode fuer eine kathodenstrahlroehre"
EP0247470A2 (fr) * 1986-05-23 1987-12-02 Nokia (Deutschland) GmbH Dispositif générateur de faisceau d'électrons

Also Published As

Publication number Publication date
JP3065620B2 (ja) 2000-07-17
JPH01200540A (ja) 1989-08-11
DE3886264D1 (de) 1994-01-27
CA1296048C (fr) 1992-02-18
EP0293854B1 (fr) 1993-12-15
US4942334A (en) 1990-07-17
DE3718838A1 (de) 1988-12-15

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