EP0157445A1 - Elektronenstrahlröhre - Google Patents

Elektronenstrahlröhre Download PDF

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Publication number
EP0157445A1
EP0157445A1 EP85200346A EP85200346A EP0157445A1 EP 0157445 A1 EP0157445 A1 EP 0157445A1 EP 85200346 A EP85200346 A EP 85200346A EP 85200346 A EP85200346 A EP 85200346A EP 0157445 A1 EP0157445 A1 EP 0157445A1
Authority
EP
European Patent Office
Prior art keywords
lens
electron beam
screen
helix
electron
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Withdrawn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
EP85200346A
Other languages
German (de)
English (en)
French (fr)
Inventor
Aart Adrianus Van Gorkum
Leopold Cyrille M. Beirens
Gerardus Arnoldus H. M. Vrijssen
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of EP0157445A1 publication Critical patent/EP0157445A1/de
Withdrawn legal-status Critical Current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
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/48—Electron guns
    • 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
    • H01J29/58—Arrangements for focusing or reflecting ray or beam
    • H01J29/62—Electrostatic lenses
    • H01J29/622—Electrostatic lenses producing fields exhibiting symmetry of revolution
    • H01J29/624—Electrostatic lenses producing fields exhibiting symmetry of revolution co-operating with or closely associated to an electron gun
    • 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
    • H01J29/51—Arrangements for controlling convergence of a plurality of beams by means of electric field only
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/48—Electron guns
    • H01J2229/4824—Constructional arrangements of electrodes
    • H01J2229/4827—Electrodes formed on surface of common cylindrical support

Definitions

  • the invention relates to an electron beam tube with means for generating at least two electron beams, which converge completely or almost completely on a screen and are deflected via this screen, wherein a raster is described and each electron beam is focused at least by a focusing lens on the screen to an impact spot.
  • Such a cathode ray tube is known from US Pat. No. 3,906,279, which can be considered to be incorporated herein.
  • An electron beam generating system for generating three electron beams is described therein, which contains three electron beam generators running with their axes parallel and lying in one plane. Due to the eccentric arrangement of the last electrodes of the outer electron beam generators, a two-pole component is added to the lens field in the focusing lenses of these electron beam generators, as a result of which the outer electron beams are directed towards the central electron beam, so that the three electron beams converge on the screen.
  • DE-OS 29 34 993 which can be regarded as being incorporated herein, describes an electron beam tube with such an electron beam generation system, in which the outer electron beams are not converged in the focusing lenses, but in the triode part of the two outer electron beam generators.
  • the triode part of a jet generator is through the cathode, the control electrode (g-1) and the first anode (g-2) are formed.
  • US Pat. No. 3,011,090 which can also be considered to be incorporated herein, describes an electron beam tube with an electron gun system with electron guns whose parallel axes are equidistant from one another.
  • the last cylindrical electrode of the beam generating system is common to the three electron beams and, together with the electrically conductive wall covering, forms an electron lens converging on the inner wall of the neck of the electron beam tube.
  • the effective diameter of this converging lens is between the diameter of the last cylindrical electrode and the inside diameter of the neck with the electrically conductive wall covering. This is explained in more detail below.
  • US Pat. No. 3,748,5144 which can be considered to be incorporated herein, describes an electron beam tube in which the beam generating system includes a long coil electrode for accelerating a large number of electron beams so as to compensate for mutual space charge repulsion of the beams.
  • the beam generating system includes a long coil electrode for accelerating a large number of electron beams so as to compensate for mutual space charge repulsion of the beams.
  • all electron beams are converged on the screen at the same time, focused and then deflected on the screen.
  • the convergence and the focusing are magnetic and take place by means of a focusing coil around the part of the coil electrode lying on the screen side.
  • a disadvantage of this tube is that all electron beams are focused and converged by the same lens at the same time. Focusing and convergence are therefore linked to one another, which means that dynamic convergence is not possible.
  • the invention is based on the object of specifying an electron beam tube in which the spherical aberration due to the convergence is minimal, in which the focusing of the electron beams and the convergence can be set separately from one another and, if necessary, dynamically.
  • the length 1 was many times greater than the diameter D, whereby an accelerating anode was obtained rather than an electron lens.
  • 1 ⁇ 2D a sufficiently strong lens effect can be achieved.
  • the lens diameter is as large as possible and, for example, is equal to the inner diameter of the neck.
  • the effective diameter of the lens lies between the diameter of the last cylindrical electrode and the inside diameter of the neck with the electrically conductive wall covering. This effective diameter is therefore smaller than that of a helical lens on the neck wall, as a result of which the spherical aberration due to the lens according to the US patent is greater.
  • the spherical aberration in the electron beams due to the Wen according to the invention dell lens is not only reduced by the relatively large lens diameter, but also by the helix, since the field gradient in the lens can be kept small by the length of the helix. If the electron beams are now at a relatively small and approximately equal distance from the lens axis in comparison to the previously known lenses, the slight spherical aberration of this converging lens, which is expressed as a defect in the striking spots of the outer electron beams on the screen, has almost no disturbing effect Influence on the electron beams.
  • US Pat. No. 3,452,246 describes a helical lens for focusing a single electron beam and not for converging some electron beams that have already been focused per se.
  • a first preferred embodiment of an electron beam tube according to the invention is characterized in that the electron beams emerging from the focusing lenses run essentially parallel to one another and are converged essentially by the helix lens, the focal point of the helix lens being on or almost on the screen.
  • each electron beam essentially takes place through the focusing lenses.
  • the focusing lenses focus the electron beams on the screen, with the bundle node formed shortly behind the cathode, the so-called "cross-over", being displayed on the screen.
  • the focusing lens is always stronger than the converging lens. The difference becomes larger for larger values of M.
  • a second preferred embodiment of the electron beam tube according to the invention is characterized in that the electron beams emerging from the focusing lenses converge and this convergence is corrected by the helix lens, so that the electron beams converge on or almost on the screen.
  • the convergence can be corrected dynamically during the deflection, so that, for example, non-self-converging coils can also be used.
  • the helix lens can be a bi-potential or uni-potential helix lens.
  • the bi-potential spiral lens can be an accelerating or decelerating lens.
  • the uni-potential spiral lens consists of a spiral electrode with a branch to which a potential is applied such that the potential gradient is reversed in part of the spiral.
  • An advantage of such a uni-potential spiral lens is that the potential on the last electrode of the beam generating system can be equal to the potential on the screen, so that the electrodes of the electron beam generating system can be operated at the usual potentials.
  • the branch does not need to be placed in the middle of the spiral electrode.
  • an electron beam tube is shown schematically in longitudinal section, in this case a color television picture tube according to the invention.
  • the outer bulb 1 of this picture display tube consists of an image window 2, a cone 3 and a neck 4.
  • an electron beam generating system 5 is attached, which contains three beam generators 6, 7 and 8, which generate the electron beams 9, 10 and 11 respectively.
  • the axis of the middle jet generator 7 coincides with the tube axis 12.
  • the screen 13 is attached to the inside of the image window 2. This screen consists of a multiplicity of triples of essentially parallel strips of phosphor. Each triple is given a red, green and blue stripe in the same order.
  • a color selection electrode 14 (for example a shadow mask) is provided shortly in front of the screen and is provided with a multiplicity of rows of elongated openings 15 running parallel to the strips.
  • the electron beams are deflected in two mutually perpendicular directions via the screen 13 with the deflection coil system 16.
  • Each of the beam generators 6, 7 and 8 is provided at its end on the screen side with a focusing lens with which the electron beams are focused on the screen.
  • the electron beams are converged on the screen using a helical lens 17. Because of the convergence, the electron beams make an acute angle at the location of the color selection electrode 14 form with each other, the electron beams go through the openings 15 at this angle and each reach only strips of phosphor with one color.
  • the convergence of the electron beams can only take place with the helix lens 17, as will be explained below with reference to FIGS. 3 and 4. However, it is also possible, as will be explained with reference to FIG. 2 and FIG. 5, to have partially converging electron beams converge with the helix lens.
  • the invention for converging electron beams with the aid of a helical lens is of course not restricted to color television picture tubes on which the impingement spots of the three electron beams collide on the screen. In multi-beam tubes, it is often necessary to converge some electron beams in such a way that the impact spots are at a small defined distance from one another, for example at the line spacing. A spiral lens is particularly suitable for this.
  • the invention can basically be used in multi-beam tubes with two or more electron beams. In the case of such tubes, the impact spots can lie in a row or in a matrix which is deflected via the screen.
  • the helical lens 17 is electrically connected at its end 18 on the screen to the electrically conductive inner cover 19 of the cone 3, which is again connected to the aluminum cover (not shown here) of the screen 13, the high-voltage contact 22 and the color selection means 14.
  • the other end 20 of the helical lens 17 is electrically connected with a contact spring 21 to the generator end 23 and to the last electrodes of the focusing lenses.
  • the measured relative impact points x (mm) for the impact points R (red), G (green) and B (blue) are dependent on the voltage V (kV) across the helical lens in an image display tube of the type according to FIG. 1 shown.
  • An image display tube was used for these measurements, with a uni-potential spiral lens on the inside of the image display tube neck 4 (Fig. 1) with a diameter of 36 mm and with an inner diameter of 32 mm was attached.
  • the spiral lens had a length of 30 mm.
  • the helix lens consisted of 75 turns with a width of 0.35 mm and a pitch of 0.4 mm.
  • the total resistance was 10 10 ⁇ . This means a power loss of around 0.6 W at a voltage of 25 kV across the filament.
  • Such helix lenses can also be made from known materials from which electrical resistors are also made, such as metals, electrically conductive enamels and glasses, etc.
  • a helix lens usually contains 2 to 3 turns per mm. However, the number of turns per mm is not critical, since a spiral lens is the potential gradient.
  • the distance between the center C of the spiral lens and the screen was 205 mm in this reproduction tube.
  • the generator used was an "in-line” beam generator as used in Philips 30-AX color television tubes (see “30 AX Self-aligning 110 0 in line color-tv display", IEEE Trans. Cons. El., CE 24, (1978) 481). The distance from this beam generator to the center C of the spiral lens was 32 mm.
  • Fig. 3 shows a longitudinal section through the neck 28 of an electron beam tube with an electron gun, followed by a bi-potential spiral lens.
  • the connections of the pins 29 to the electrodes of the electron gun are omitted for clarity.
  • the inner diameter D of the neck is 28 mm.
  • the length 1 of the helix 39 is also 28 mm.
  • the electron gun 30 includes three integrated electron guns.
  • the cathodes 31 are located in first grids 32, which are again mounted in the second grid 33, which is common to the three beam generators.
  • the cathodes, the first grids and the second grids are fastened to one another by means of ceramic material 27.
  • the other electrodes are attached in the usual way with glass rods, not shown here.
  • the focusing lenses for the three electron beams 36, 37 and 38 are formed between the mutually opposite openings in the common electrodes 34 and 35 by applying voltages.
  • the voltages supplied are indicated for the various electrodes.
  • the parallel electron beams emerging from the beam generation system 30 are converged by the bi-potential spiral lens 39, so that the impingement spots of the three beams coincide on the screen lying 280 mm further from the center C of the spiral lens along the beam 37.
  • the voltage at the helix lens is 17 kV when converging.
  • FIG. 4 shows, in a manner analogous to FIG. 3, a longitudinal section through the neck 28 of an electron beam tube with an electron gun, followed by a uni-potential spiral lens.
  • the connections of the connection pins 29 to the electrodes of the electron gun are omitted in this figure for the sake of clarity.
  • the inside diameter D of the neck is 28 mm.
  • the length 1 of the helix 40 is also 28 mm.
  • the beam generation system 30 is identical to that of FIG. 3.
  • the voltages supplied are again indicated for the various electrodes.
  • the parallel electron beams emerging from the electron beam generation system 30 are converged by a uni-potential spiral lens 40, so that the impact spots of the three beams on the 280 mm further from the center C of the spiral lens along the beam 37 lying screen coincide.
  • the helical lens 40 is provided with a branch in the form of an electrical glass bushing 41.
  • the Uni potential spiral lens is obtained by applying a higher or lower potential (here 13 kV) to this junction compared to the voltages at the coil ends (here 25 kV).
  • FIG. 5 a longitudinal section through the neck 28 of an electron beam tube with a bi-potential spiral lens is shown analogously to FIGS. 3 and 4.
  • the connections of the connection pins 29 to the electrodes of the electron gun are omitted for the sake of clarity.
  • the inside diameter D of the neck is 28 mm.
  • the length 1 of the helix 68 is also 28 mm.
  • Electron beam generating system 51 is a separate beam generator system as described in U.S. Patent 4,291,251. Convergence of electron beams 52, 53 and 54 is in this case obtained by having ends 70 of electrodes 55 and 56 which are the electrodes 57 and 58 are opposite and normally form an angle of 90 ° with the generator axis, form an angle of approximately 87 ° with the generator axis.
  • the cathodes 60 are located in the first grids 59.
  • the electron beams are focused with the aid of lens fields between the electrodes 56 and 62, the electrodes 61 and 63 and the electrodes 55 and 64.
  • the electrodes 62, 63 and 64 are fastened to a centering cup 65 which is connected to the electrically conductive wall covering 67 by means of a contact spring 66.
  • the helical lens 68 is attached between this cover 67 and the wall cover 69 of the cone, which is connected to the aluminum cover of the screen.
  • the wall covering 69 is also connected to the high-voltage contact 22 (see FIG. 1) and is kept at a voltage of 25 kV.

Landscapes

  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
EP85200346A 1984-03-12 1985-03-11 Elektronenstrahlröhre Withdrawn EP0157445A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8400779A NL8400779A (nl) 1984-03-12 1984-03-12 Kathodestraalbuis.
NL8400779 1984-03-12

Publications (1)

Publication Number Publication Date
EP0157445A1 true EP0157445A1 (de) 1985-10-09

Family

ID=19843628

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85200346A Withdrawn EP0157445A1 (de) 1984-03-12 1985-03-11 Elektronenstrahlröhre

Country Status (8)

Country Link
US (1) US4899079A (nl)
EP (1) EP0157445A1 (nl)
JP (1) JPS60208027A (nl)
KR (1) KR850006971A (nl)
CA (1) CA1228108A (nl)
DD (1) DD232374A5 (nl)
ES (1) ES8606733A1 (nl)
NL (1) NL8400779A (nl)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0342761A1 (en) * 1988-05-20 1989-11-23 Koninklijke Philips Electronics N.V. Display tube including a helical focusing lens with a non-rotationally symmetrical lens element
EP0233379B1 (en) * 1986-02-17 1991-06-12 Koninklijke Philips Electronics N.V. Cathode ray tube and method of manufacturing a cathode ray tube

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5291102A (en) * 1990-10-12 1994-03-01 Washburn Clayton A Dynamic color separation display
JPH09293465A (ja) 1995-11-28 1997-11-11 Matsushita Electric Ind Co Ltd 陰極線管用抵抗体の製造方法
JP3780826B2 (ja) * 2000-07-07 2006-05-31 松下電器産業株式会社 陰極線管用電子銃

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3011090A (en) * 1952-06-24 1961-11-28 Rca Corp Plural beam tube
GB1256507A (nl) * 1968-04-10 1971-12-08
US3748514A (en) * 1971-08-18 1973-07-24 A Standaart Multi-beam cathode ray tube character display
EP0019975A1 (en) * 1979-05-25 1980-12-10 Koninklijke Philips Electronics N.V. Colour display tube

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2123636A (en) * 1932-02-23 1938-07-12 Firm Fernseh Aktien Ges High-vacuum cathode ray tube
US3143681A (en) * 1959-12-07 1964-08-04 Gen Electric Spiral electrostatic electron lens
US3223871A (en) * 1961-08-22 1965-12-14 Gen Electric Electron optical system
DE1464573A1 (de) * 1962-11-19 1968-11-21 Egyesuelt Izzolampa Hochempfindliche Kathodenstrahlroehren mit Spiralnachbeschleunigung
US3374386A (en) * 1964-11-02 1968-03-19 Field Emission Corp Field emission cathode having tungsten miller indices 100 plane coated with zirconium, hafnium or magnesium on oxygen binder
GB1353872A (en) * 1972-07-05 1974-05-22 Thorn Electrical Ind Ltd Cathode ray tubes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3011090A (en) * 1952-06-24 1961-11-28 Rca Corp Plural beam tube
GB1256507A (nl) * 1968-04-10 1971-12-08
US3748514A (en) * 1971-08-18 1973-07-24 A Standaart Multi-beam cathode ray tube character display
EP0019975A1 (en) * 1979-05-25 1980-12-10 Koninklijke Philips Electronics N.V. Colour display tube

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0233379B1 (en) * 1986-02-17 1991-06-12 Koninklijke Philips Electronics N.V. Cathode ray tube and method of manufacturing a cathode ray tube
EP0342761A1 (en) * 1988-05-20 1989-11-23 Koninklijke Philips Electronics N.V. Display tube including a helical focusing lens with a non-rotationally symmetrical lens element

Also Published As

Publication number Publication date
DD232374A5 (de) 1986-01-22
CA1228108A (en) 1987-10-13
JPS60208027A (ja) 1985-10-19
NL8400779A (nl) 1985-10-01
ES8606733A1 (es) 1986-04-16
ES541088A0 (es) 1986-04-16
KR850006971A (ko) 1985-10-25
US4899079A (en) 1990-02-06

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Inventor name: BEIRENS, LEOPOLD CYRILLE M.

Inventor name: VAN GORKUM, AART ADRIANUS

Inventor name: VRIJSSEN, GERARDUS ARNOLDUS H. M.