EP0452789A2 - Farbbildröhre mit "inline" Elektronenkanone mit Fokusjustierung - Google Patents

Farbbildröhre mit "inline" Elektronenkanone mit Fokusjustierung Download PDF

Info

Publication number
EP0452789A2
EP0452789A2 EP91105658A EP91105658A EP0452789A2 EP 0452789 A2 EP0452789 A2 EP 0452789A2 EP 91105658 A EP91105658 A EP 91105658A EP 91105658 A EP91105658 A EP 91105658A EP 0452789 A2 EP0452789 A2 EP 0452789A2
Authority
EP
European Patent Office
Prior art keywords
lens
electrode
beams
focus
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
EP91105658A
Other languages
English (en)
French (fr)
Other versions
EP0452789A3 (en
EP0452789B1 (de
Inventor
Loren Lee Maninger
Bruce George Marks
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.)
Technicolor USA Inc
Original Assignee
Thomson Consumer Electronics Inc
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 Thomson Consumer Electronics Inc filed Critical Thomson Consumer Electronics Inc
Publication of EP0452789A2 publication Critical patent/EP0452789A2/de
Publication of EP0452789A3 publication Critical patent/EP0452789A3/en
Application granted granted Critical
Publication of EP0452789B1 publication Critical patent/EP0452789B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • H01J29/50—Electron guns two or more guns in a single vacuum space, e.g. for plural-ray tube
    • 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
    • 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
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/48—Electron guns
    • H01J2229/4844—Electron guns characterised by beam passing apertures or combinations
    • H01J2229/4848—Aperture shape as viewed along beam axis
    • H01J2229/4872—Aperture shape as viewed along beam axis circular
    • 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
    • H01J2229/4844—Electron guns characterised by beam passing apertures or combinations
    • H01J2229/4848—Aperture shape as viewed along beam axis
    • H01J2229/4896—Aperture shape as viewed along beam axis complex and not provided for

Definitions

  • the present invention relates to improved color picture tubes having inline electron guns, and particularly to a tube having an inline electron gun that includes means for adjusting the focus of one electron beam relative to the focus of another beam.
  • the resolution of the picture is dependent upon having small electron beam spot sizes at the tube viewing screen.
  • an electron gun generates three electron beams which must be simultaneously focused to small spots on the screen.
  • Focusing the beams requires not only that the focus voltage be the same for each beam and that the free fall or undeflected beam requirements be met, but also that the astigmatism for each beam must be correct.
  • the astigmatism of the side beams may be the same as or different from that of the center beam.
  • the astigmatism is made positive (V Horiz > V Vert ) at the screen center in order to compensate for the lensing action of the deflection yoke, which over- focuses the beams upon deflection.
  • the focus voltage is set at the value that is required to spot focus the horizontal component of the beam.
  • the desired astigmatism for the side beams may be different than that for the center beam, but the horizontal component of spot focus voltage must be the same for all beams.
  • the astigmatism is set at zero for all three beams at the screen center. In this case, all three beams must focus at the same horizontal focus voltage condition and have zero astigmatism.
  • the final optimization of the focus voltage and the astigmatism of each beam is accomplished by simultaneously adjusting the length, width and diameter of a recess and rim of the final electrode of the main focusing lens. Because the main focusing lens is common to all three beams, these dimensional changes are simultaneously interactive with all three beams. It is difficult, if not impossible, to find a set of dimensions in the main focusing lens electrodes which will satisfy the focusing requirements of the three beams at the same time.
  • the present invention solves this problem by utilizing the second focus lens in a gun to do the necessary focus voltage and astigmatism correction that cannot be provided in the main focusing lens alone.
  • a color picture tube has a viewing screen and an electron gun for generating and directing three inline electron beams, a center beam and two side beams, toward the screen.
  • the gun includes electrodes that form three focus lenses.
  • a first lens is located in a beam-forming region of the gun.
  • a second lens includes at least one electrode for providing asymmetrically-shaped beams to a third lens system.
  • the third lens is a common main focus lens for all three beams.
  • the improvement comprises one of the electrodes of the third lens being shaped to provide a major amount of focus correction for each individual electron beam, and the one electrode of the second lens including means for providing the remaining amounts of focus correction needed to substantially totally correct each individual electron beam.
  • FIGURE 1 is a plan view, partly in axial section, of a color picture tube embodying the invention.
  • FIGURE 2 is a side view, in axial section, of the electron gun shown in dashed lines in FIGURE 1.
  • FIGURE 3 is a front view of the face of a G6 electrode that opposes a G5 electrode in the electron gun of FIGURE 2.
  • FIGURE 4 is a front view of the face of the G5 electrode that opposes the G6 electrode in the electron gun of FIGURE 2.
  • FIGURE 5 is a front view of a G4 electrode in the electron gun of FIGURE 2.
  • FIGURE 6 is a graph of vertical and horizontal beam focus and astigmatism voltages versus G4 electrode aperture width.
  • FIGURE 7 is a graph of focus and astigmatism voltage versus G4 electrode thickness.
  • FIGURES 8 and 9 are front and side views, respectively, of an alternative G4 electrode.
  • FIGURE 10 is a side view of a second alterative G4 electrode.
  • FIGURE 11 is a side view of a third alterative G4 electrode.
  • FIGURE 12 is a side view of a fourth alternative G4 electrode.
  • FIGURE 13 is a side view, in axial section, of an alternative electron gun type.
  • FIGURE 14 is a side view, in axial section, of a second alternative electron gun type.
  • FIGURE 1 shows a rectangular color picture tube 10 having a glass envelope 11 comprising a rectangular faceplate panel 12 and a tubular neck 14 connected by a rectangular funnel 16.
  • the funnel 16 has an internal conductive coating (not shown) that extends from an anode button (not shown) to the neck 14.
  • the panel 12 comprises a viewing faceplate 18 and a peripheral flange or sidewall 20, which is sealed to the funnel 16 by a glass frit 17.
  • a three-color phosphor screen 22 is carried by the inner surface of the faceplate 18.
  • the screen 22 is preferably a line screen with the phosphor lines arranged in triads, each triad including a phosphor line of each of the three colors.
  • the screen can be a dot screen.
  • a multi-apertured color selection electrode or shadow mask 24 is removably mounted, by conventional means, in predetermined spaced relation to the screen 22.
  • An improved electron gun 26, shown schematically by dashed lines in FIGURE 1, is centrally mounted within the neck 14 to generate and direct three electron beams along convergent paths through the mask 24 to the screen 22.
  • the tube of FIGURE 1 is designed to be used with an external magnetic deflection yoke, such as the yoke 30 shown in the neighborhood of the funnel-to-neck junction.
  • an external magnetic deflection yoke such as the yoke 30 shown in the neighborhood of the funnel-to-neck junction.
  • the yoke 30 subjects the three beams to magnetic fields which cause the beams to scan horizontally and vertically in a rectangular raster over the screen 22.
  • the initial plane of deflection (at zero deflection) is at about the middle of the yoke 30.
  • the details of the electron gun 26 are shown in FIGURES 2, 3, 4 and 5.
  • the gun 26 comprises three spaced inline cathodes 34 (only one of which is shown), a control grid electrode 36 (G1), a screen grid electrode 38 (G2), an accelerating electrode 40 (G3), a plate-shaped electrode 42 (G4), a first main focus lens electrode 44 (G5), and a second main focusing lens electrode 48 (G6), spaced in the order named.
  • Each of the G1 through G6 electrodes has three inline apertures therein to permit passage of three electron beams.
  • the electrostatic main focusing lens in the gun 26 is formed by the facing portions of the G5 electrode 44 and the G6 electrode 48.
  • the G5 electrode 44 and the G6 electrode 48 are similar in construction, in that they have opposing faces that include peripheral rims 60 and 61, respectively, and apertured portions 62 and 63, respectively, set back in large recesses 64 and 66, respectively, from the rims.
  • the portion 62 includes three inline apertures 68, and the portion 63 includes three inline apertures 69.
  • the rims 60 and 62 are the closest portions of the two electrodes 44 and 48 to each other and have the predominant effect on forming the main focusing lens.
  • the G1 control grid 36 and the G2 screen grid 38 are plates, each including three small inline apertures.
  • the face of the G2 screen grid that opposes the G3 electrode 40 preferably includes a rectangular slot (not shown) therein that surrounds the three G2 apertures. The purpose of the slot is to adjust the positions of the outer electron beams to compensate for movements of the beams caused by focus voltage variations.
  • All of the electrodes of the gun 26 are either directly or indirectly connected to two insulative support rods (not shown).
  • the rods may extend to and support the G1 electrode 36 and the G2 electrode 38, or these two electrodes may be attached to the G3 electrode 40 by some other insulative means.
  • the support rods are of glass which has been heated and pressed onto claws extending from the electrodes, to embed the claws in the rods.
  • the electrodes of the electron gun 26 provide three lenses for focusing the electron beams.
  • a first lens (L1) is located between the G2 and G3 electrodes, 38 and 40, in the beam-forming region of the gun.
  • the first lens (L1) provides substantially symmetrical beams to a second lens.
  • the second lens (L2) is centered in the G4 electrode 42.
  • the second lens (L2) provides asymmetrically-shaped beams to a third lens.
  • the third lens (L3) is located between the G5 and G6 electrodes, 44 and 48.
  • the third lens (L3) is a low aberration main focusing lens which provides either round or asymmetrically-shaped beams of substantially constant current density to the screen 22.
  • the recess 66 in the G6 electrode 48 has a different shape than the recess 64 in the G5 electrode 44.
  • the recess 66 in the G6 electrode 48 is configured to bring the center and side electron beams to the required free fall condition and close to the desired focusing and astigmatic condition. This is done by simultaneously adjusting: the length of the recess 66, measured in the inline direction of the apertures 69; the width of the recess 66, measured perpendicular to the inline direction at the center aperture; and the diameter of the ends of the recess 66. As stated above, the adjustment of each of these length, width and diameter dimensions is interactive with all three electron beams.
  • this additional correction is provided by independently focusing the side beams differently than the center beam is focused in the second focus lens L2.
  • such correction is provided by modifying the G4 electrode 42 structure.
  • FIGURE 5 shows the G4 electrode 42 with three inline apertures 70, 71 and 72 therein.
  • the general shape of the three apertures is circular; however, smaller radius partial circles extend the aperture boundaries on each side thereof.
  • the size of the side apertures 70 and 72 is slightly different than the size of the center aperture 71. It should be noted that other aperture shapes could also be used in the G4 electrode.
  • plots of vertical and horizontal focus voltage and astigmatism voltage versus G4 electrode aperture horizontal width, measured in the inline direction of the inline apertures, are made for the center and side beams, as shown in FIGURE 6.
  • the vertical dimension of each of the apertures, measured perpendicularly to the inline direction of the inline apertures, is fixed at 0.158 inch (0.401 cm).
  • the slopes of the focus voltage plots for the center and side beams do not diverge greatly.
  • the slopes for the horizontal focus voltage plots for the center and side beams are small; however, they are large enough so that aperture dimensions, that will let each beam come into horizontal focus at the same voltage, can be independently found.
  • the astigmatism can be found by utilizing the bottom plots showing center and side beam astigmatism.
  • This residual astigmatism can be corrected by modification of the shape (length, width and diameter) of the recess in the G6 electrode, or it can be corrected in the G4 electrode itself by changing the thickness of the G4 electrode at its apertures.
  • FIGURE 7 shows plots of the center and side beam focus and astigmatism voltage versus G4 thickness.
  • a change in thickness has a negligible effect on horizontal focus of the center and side beams, because their plots are relatively flat, but it does have an appreciable effect on the vertical focus of these beams, because of the positive slope. Therefore, astigmatism can be corrected, without affecting the horizontal focus condition, by varying the thickness of the electrode (because such variation only affects the vertical focus of the beams).
  • the slope of the astigmatism as a function of G4 electrode thickness is 41 volts/mil (16.1 kV/cm) for the side beams and 28 volts/mil (11.0 kV/cm) for the center beam. If the center and side beam horizontal focus voltages are equalized to 7 kV, in accordance with FIGURE 6, the center beam astigmatism of 416 volts can be reduced to the side beam astigmatism of 167 volts by increasing the G4 electrode thickness at the center beam by 0.0088 inch (0.0 22 cm).
  • FIGURES 8 and 9 show an alternative G4 electrode 42' which has a reduced thickness at the side apertures 70' and 72', as discussed above.
  • another alternative G4 electrode 42'' shown in FIGURE 10
  • the thickness of the electrode is reduced at the center aperture 71''.
  • Two more alternative G4 electrodes, 142 and 242 are shown in FIGURES 11 and 12, respectively.
  • the G4 electrode 142 is thinned on both surfaces at the side beams, and the G4 electrode 242 is thinned on both surfaces at the center aperture.
  • the specific G4 electrode embodiment selected will depend on the plots that are developed for a particular type of electron gun.
  • One set of dimensions for the electron gun 26 is given in the following table.
  • the desired astigmatism is achieved using equal G4 aperture thicknesses for all three beams.
  • FIGURE 13 The details of another electron gun embodiment 27, which may employ the present invention, are shown in FIGURE 13.
  • the gun 27 is similar to the electron gun 26, except that the G5 electrode is divided into two parts, a first quadrupole electrode 45 (G5B), and a combined second quadrupole electrode and first main focusing lens electrode 47 (G5T).
  • the quadrupole electrodes form a quadrupole lens therebetween in the path of each electron beam.
  • the purpose of the quadrupole lenses is to provide a dynamic astigmatism correction within the electron gun.
  • the G5B electrode 45 comprises a cup-shaped portion 54, having three apertures in the bottom thereof.
  • a plate 56 having three inline apertures therein, closes the open end of the cup-shaped portion 54.
  • the plate 56 includes extrusions extending therefrom in alignment with the apertures.
  • Each extrusion includes two sector portions 58.
  • the two sector portions 58 are located opposite each other, and each sector portion 58 encompasses approximately 85 degrees of the circumference of a cylinder.
  • the G5T electrode 47 also comprises a cup-shaped portion 49 having an open end thereof closed by a plate 57 that includes three inline apertures.
  • Each aperture has extrusions that extend toward the G5 electrode 45.
  • the extrusions of each aperture are formed in two sector portions 72.
  • the two sector portions 72 are located opposite each other, and each sector portion 72 encompasses approximately 85 degrees of the cylinder circumference.
  • the positions of the sector portions 72 are rotated 90° from the positions of the sector portions 58 of the G5B electrode 45, and the four sector portions are assembled in non-touching, interdigitated fashion.
  • FIGURE 14 Another electron gun 29 that may utilize the present invention is shown in FIGURE 14.
  • This gun 29 is also similar to the electron gun 26, except that the electrodes are electrically connected in a different manner. Specifically, the G6 electrode is connected to the G4 electrode, and the G5 electrode is connected to the G3 electrode.

Landscapes

  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Electron Sources, Ion Sources (AREA)
EP91105658A 1990-04-16 1991-04-10 Farbbildröhre mit "inline" Elektronenkanone mit Fokusjustierung Expired - Lifetime EP0452789B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US50953790A 1990-04-16 1990-04-16
US509537 1990-04-16

Publications (3)

Publication Number Publication Date
EP0452789A2 true EP0452789A2 (de) 1991-10-23
EP0452789A3 EP0452789A3 (en) 1992-02-12
EP0452789B1 EP0452789B1 (de) 1995-11-29

Family

ID=24027042

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91105658A Expired - Lifetime EP0452789B1 (de) 1990-04-16 1991-04-10 Farbbildröhre mit "inline" Elektronenkanone mit Fokusjustierung

Country Status (10)

Country Link
EP (1) EP0452789B1 (de)
JP (1) JP2616849B2 (de)
KR (1) KR950002262B1 (de)
CN (1) CN1041577C (de)
CA (1) CA2039501C (de)
DE (1) DE69114893T2 (de)
MY (1) MY105411A (de)
PL (1) PL165538B1 (de)
RU (1) RU2025818C1 (de)
TR (1) TR25229A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2702085A1 (fr) * 1993-02-24 1994-09-02 Hitachi Ltd Tube cathodique.
FR2705164A1 (fr) * 1993-05-10 1994-11-18 Thomson Tubes & Displays Tube image couleurs à canons à électrons en ligne avec lentilles astigmatiques.
GB2315153A (en) * 1996-07-05 1998-01-21 Sony Corp In-line electron gun for color cathode ray tube
KR19980040898A (ko) * 1996-11-30 1998-08-17 엄길용 인라인형 전자총의 통형전극
CN1054462C (zh) * 1994-06-30 2000-07-12 中华映管股份有限公司 彩色显像管的电子枪

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030060616A (ko) * 2002-01-10 2003-07-16 엘지.필립스디스플레이(주) 칼라음극선관용 전자총
CN1306544C (zh) * 2004-01-05 2007-03-21 彩虹集团电子股份有限公司 调整彩色显像管电子束配列的工艺方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2101805A (en) * 1981-07-10 1983-01-19 Rca Corp Color picture tube and inline electron gun
JPS58198830A (ja) * 1982-05-14 1983-11-18 Hitachi Ltd カラー受像管
EP0104674A1 (de) * 1982-08-25 1984-04-04 Koninklijke Philips Electronics N.V. Farbbildröhre
JPS60140637A (ja) * 1983-12-28 1985-07-25 Toshiba Corp カラ−受像管用電子銃
EP0275191A2 (de) * 1987-01-14 1988-07-20 RCA Thomson Licensing Corporation Farbbildröhre mit einer Drei-Linsen-Elektronenkanone

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4400649A (en) * 1981-07-10 1983-08-23 Rca Corporation Color picture tube having an improved expanded focus lens type inline electron gun
FR2590724B1 (fr) * 1985-11-22 1988-01-08 Videocolor Dispositif de correction de l'effet de deviation du a une variation de la tension de focalisation dans un tube cathodique trichrome a cathodes en ligne
US4764704A (en) * 1987-01-14 1988-08-16 Rca Licensing Corporation Color cathode-ray tube having a three-lens electron gun
CN1013534B (zh) * 1987-04-08 1991-08-14 彩色图象公司 三色阴极射线管偏移效应的校正装置
US4737682A (en) * 1987-07-20 1988-04-12 Rca Corporation Color picture tube having an inline electron gun with an einzel lens
JP2690930B2 (ja) * 1988-02-26 1997-12-17 株式会社日立製作所 カラー陰極線管用電子銃

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2101805A (en) * 1981-07-10 1983-01-19 Rca Corp Color picture tube and inline electron gun
JPS58198830A (ja) * 1982-05-14 1983-11-18 Hitachi Ltd カラー受像管
EP0104674A1 (de) * 1982-08-25 1984-04-04 Koninklijke Philips Electronics N.V. Farbbildröhre
JPS60140637A (ja) * 1983-12-28 1985-07-25 Toshiba Corp カラ−受像管用電子銃
EP0275191A2 (de) * 1987-01-14 1988-07-20 RCA Thomson Licensing Corporation Farbbildröhre mit einer Drei-Linsen-Elektronenkanone

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 8, no. 44 (E-229)[1481] 25 February 1984; & JP-A-58 198 830 (HITACHI SEISAKUSHO K.K.) 18 November 1983 *
PATENT ABSTRACTS OF JAPAN, vol. 9, no. 302 (E-362)[2025] 29 November 1985; & JP-A-60 140 637 (TOSHIBA K.K.) 25 July 1985 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2702085A1 (fr) * 1993-02-24 1994-09-02 Hitachi Ltd Tube cathodique.
FR2705164A1 (fr) * 1993-05-10 1994-11-18 Thomson Tubes & Displays Tube image couleurs à canons à électrons en ligne avec lentilles astigmatiques.
US5430349A (en) * 1993-05-10 1995-07-04 Thomson Tubes And Displays, S.A. Color picture tube having an inline electron gun with three astigmatic lenses
CN1054462C (zh) * 1994-06-30 2000-07-12 中华映管股份有限公司 彩色显像管的电子枪
GB2315153A (en) * 1996-07-05 1998-01-21 Sony Corp In-line electron gun for color cathode ray tube
US5883463A (en) * 1996-07-05 1999-03-16 Sony Corporation In-line electron gun for color cathode ray tube with cut away structure on field correcting electrodes
GB2315153B (en) * 1996-07-05 2001-07-04 Sony Corp In-line electron gun for color cathode ray tube
KR19980040898A (ko) * 1996-11-30 1998-08-17 엄길용 인라인형 전자총의 통형전극

Also Published As

Publication number Publication date
KR910019103A (ko) 1991-11-30
CA2039501C (en) 1999-02-02
CA2039501A1 (en) 1991-10-17
EP0452789A3 (en) 1992-02-12
RU2025818C1 (ru) 1994-12-30
CN1041577C (zh) 1999-01-06
PL289904A1 (en) 1992-02-10
MY105411A (en) 1994-09-30
PL165538B1 (pl) 1995-01-31
DE69114893D1 (de) 1996-01-11
EP0452789B1 (de) 1995-11-29
KR950002262B1 (ko) 1995-03-15
TR25229A (tr) 1993-01-01
JP2616849B2 (ja) 1997-06-04
CN1056016A (zh) 1991-11-06
JPH04230938A (ja) 1992-08-19
DE69114893T2 (de) 1996-06-20

Similar Documents

Publication Publication Date Title
US4877998A (en) Color display system having an electron gun with dual electrode modulation
US4814670A (en) Cathode ray tube apparatus having focusing grids with horizontally and vertically oblong through holes
EP0424888B1 (de) Farbbildkathodenstrahlröhre
EP0986088B1 (de) Farbkathodenstrahlröhre mit niedrigen dynamischen Fokussierspannung
US4764704A (en) Color cathode-ray tube having a three-lens electron gun
US4935663A (en) Electron gun assembly for color cathode ray tube apparatus
CA2036857C (en) Color picture tube having an inline electron gun with an astigmatic prefocusing lens
EP0265683B1 (de) Farbanzeigevorrichtung und Kathodenstrahlröhre
EP0235975B1 (de) Kathodenstrahlröhre und Farbanzeigevorrichtung
US4520292A (en) Cathode-ray tube having an asymmetric slot formed in a screen grid electrode of an inline electron gun
US4168452A (en) Tetrode section for a unitized, three-beam electron gun having an extended field main focus lens
EP0452789B1 (de) Farbbildröhre mit "inline" Elektronenkanone mit Fokusjustierung
EP0300705B1 (de) Farbbildröhre mit Inline-Elektronenkanone und einer Einzellinse
CA2123021C (en) Color picture tube having an inline electron gun with three astigmatic lenses
EP0361455B1 (de) Vorrichtung für eine Farbkathodenstrahlröhre
EP0275191B1 (de) Farbbildröhre mit einer Drei-Linsen-Elektronenkanone
GB2175743A (en) Cathode-ray tube electron gun having improved screen grid
US4870321A (en) Color cathode ray tube
KR970006037B1 (ko) 개선된 전자총을 갖는 음극선관
US5861710A (en) Color cathode ray tube with reduced moire
US5543681A (en) In-line type electron guns for color picture tube
US4590403A (en) Color picture tube having an improved inline electron gun
GB2144903A (en) Cathode-ray tube with electron gun having an astigmatic beam forming region
JPH03283337A (ja) カラー受像管装置
JPH02168543A (ja) カラー受像管装置

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

Kind code of ref document: A2

Designated state(s): DE FR GB IT

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB IT

17P Request for examination filed

Effective date: 19920715

17Q First examination report despatched

Effective date: 19950310

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT

REF Corresponds to:

Ref document number: 69114893

Country of ref document: DE

Date of ref document: 19960111

ITF It: translation for a ep patent filed

Owner name: ING. C. GREGORJ S.P.A.

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

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

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

REG Reference to a national code

Ref country code: FR

Ref legal event code: D6

REG Reference to a national code

Ref country code: GB

Ref legal event code: 746

Effective date: 20030103

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20060303

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20060421

Year of fee payment: 16

Ref country code: DE

Payment date: 20060421

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20060430

Year of fee payment: 16

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20070410

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20071101

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070410

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20070410