EP0889500A1 - Color picture tube having an inline electron gun - Google Patents

Color picture tube having an inline electron gun Download PDF

Info

Publication number
EP0889500A1
EP0889500A1 EP97401593A EP97401593A EP0889500A1 EP 0889500 A1 EP0889500 A1 EP 0889500A1 EP 97401593 A EP97401593 A EP 97401593A EP 97401593 A EP97401593 A EP 97401593A EP 0889500 A1 EP0889500 A1 EP 0889500A1
Authority
EP
European Patent Office
Prior art keywords
tube
focus
electron gun
neck
electrode
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
EP97401593A
Other languages
German (de)
French (fr)
Other versions
EP0889500B1 (en
Inventor
Olivier Pierre Trinchero
Mark Allen Thomson
Robert Loyd Barbin
Richard Hugh Miller
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.)
Thomson Tubes and Displays SA
Original Assignee
Thomson Tubes and Displays SA
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 Tubes and Displays SA filed Critical Thomson Tubes and Displays SA
Priority to DE69724942T priority Critical patent/DE69724942D1/en
Priority to EP97401593A priority patent/EP0889500B1/en
Priority to TW087104456A priority patent/TW398009B/en
Priority to JP50736399A priority patent/JP2002510430A/en
Priority to CN98805715A priority patent/CN1124635C/en
Priority to AU82830/98A priority patent/AU8283098A/en
Priority to KR1019997012518A priority patent/KR100360534B1/en
Priority to PCT/US1998/013757 priority patent/WO1999001884A1/en
Publication of EP0889500A1 publication Critical patent/EP0889500A1/en
Application granted granted Critical
Publication of EP0889500B1 publication Critical patent/EP0889500B1/en
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
    • 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
    • H01J29/48—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
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/56—Correction of beam optics
    • H01J2229/568—Correction of beam optics using supplementary correction devices
    • H01J2229/5681—Correction of beam optics using supplementary correction devices magnetic
    • H01J2229/5687—Auxiliary coils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/70—Electron beam control outside the vessel
    • H01J2229/703—Electron beam control outside the vessel by magnetic fields
    • H01J2229/7032—Conductor design and distribution
    • H01J2229/7035—Wires and conductors
    • H01J2229/7036—Form of conductor
    • H01J2229/7037—Form of conductor flat, e.g. foil, or ribbon type

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 a split focus electrode.
  • the resolution of a 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.
  • coils on the neck of a tube to provide scan velocity modulation (SVM).
  • SVM coil is a two-pole device aligned to produce vertical magnetic fields, which induce horizontal deflection of the electron beams. Such coils improve the image quality of a tube by modulating the horizontal deflection velocity of the electron beams.
  • the SVM coil is driven as a function of the video signal. As video rate increases, such as from the NTSC rate to VGA and SVGA rates, the SVM coil should be operated at correspondingly higher frequencies.
  • the present invention relates to a color picture tube having a viewing screen and an electron gun within a neck of the tube for generating and directing three inline electron beams, a center beam and two side beams, toward the screen.
  • the electron gun includes a plurality of electrodes including a focus electrode.
  • the tube neck is adapted for receipt of surrounding scan velocity modulation coils at a location thereon.
  • the focus electrode includes two spaced parts that are electrically connected and adapted for connection to the same focus voltage. The space between the parts is surrounded by the neck location for the coils. This space provides an eddy current-free region, thus increasing the resultant magnetic field seen by the electron beams.
  • 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 15.
  • the funnel 15 has an internal conductive coating (not shown) that extends from an anode button 16 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 15 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 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 (not shown) that is attached to the tube in the neighborhood of the funnel-to-neck junction.
  • the yoke When activated, the yoke 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 details of the electron gun 26 are shown in FIGURES 2, 3 and 4.
  • 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 focus electrode (G5) divided into two parts, 44 (G5B) and 46 (G5T), and a final electrode 48 (G6), spaced in the order named.
  • Each of the G1 through G6 electrodes has 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 G5T electrode part 46 and the G6 electrode 48.
  • the G5B electrode 44 and the G5T electrode are each formed by two pieces, 44B and 44T, and 46B and 46T, respectively.
  • All of the electrodes of the electron gun 26 are either directly or indirectly connected to two insulative support rods 50 and 52.
  • 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.
  • SVM coils 54 and 56 Shown on the neck 14 in FIGURE 2 are two scan modulation (SVM) coils 54 and 56. Each coil is somewhat rectangular and is contoured to conform to the cylindrical shape of the neck. Each coil also includes a large central window which are located opposite to each other on the top and the bottom of the neck.
  • SVM coils have been used on tubes having electron guns with fixed focus voltages, the present inventors have found that the effect of the SVM coils on these tubes can be increased by incorporating an additional space 45 within the electron gun to allow the SVM field to act on the electron beams in an unobstructed manner.
  • the space 45 permits the rapidly changing flux created by the SVM coils to reach the electron beams without suffering the losses caused by the generation of eddy currents in the electrodes.
  • This additional space 45 is formed by longitudinally separating the G5 focus electrode into two parts, the G5B electrode part 44 and the G5T electrode part 46.
  • the coils should surround the space between the parts 44 and 46, but preferably, the space should be located closer to the longitudinal center of the coils than near their ends, as shown in FIGURE 2.
  • FIGURE 3 Electrical connections of the electrodes of the electron gun 26 are shown in FIGURE 3.
  • the G1 electrode is connected to ground.
  • the G2 and G4 are connected to each other and to the G2 voltage V G2
  • the G3, G5B and G5T are all connected to each other and to a fixed focus voltage V FOCUS
  • the G6 is connected to the anode voltage V ANODE .
  • the facing pieces 44T and 46B of the two electrode parts 44 and 46 each include a single elongated aperture 47 therein, as shown for part 44T in FIGURE 4.
  • the remote pieces 44B and 46T of the two electrode parts 44 and 46 respectively, include three apertures 60, 62 and 64 therein, for passage of the three electron beams, as shown for part 44T in FIGURE 4.
  • FIGURE 5 shows an alternative embodiment of the parts 44T and 46B, designated with primes of the same items, respectively. This alternative embodiment shows how the shapes and sizes of all of the apertures in electrode parts 44 and 46 can be altered to obtain a particular level of performance.
  • a larger elongated aperture 47' is included in the part 44T' and three larger apertures, 60' 62' and 64' are included in the part 44B'.

Landscapes

  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)

Abstract

The present invention relates to a color picture tube having a viewing screen and an electron gun (26) within a neck (14) of the tube for generating and directing three inline electron beams, a center beam and two side beams, toward the screen. The electron gun includes a plurality of electrodes including a focus electrode (G5). The tube neck is adapted for receipt of a surrounding scan velocity modulation coil (54, 56) at a location thereon. The focus electrode includes two spaced parts (44, 46) that are electrically connected and adapted for connection to the same focus voltage (VFOCUS). The space (45) between the parts is surrounded by the neck location for the coil.

Description

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 a split focus electrode.
For a color picture tube, the resolution of a picture is dependent upon having small electron beam spot sizes at the tube viewing screen. In such a tube, an electron gun generates three electron beams, which must be simultaneously focused to small spots on the screen. It is known to use coils on the neck of a tube to provide scan velocity modulation (SVM). A SVM coil is a two-pole device aligned to produce vertical magnetic fields, which induce horizontal deflection of the electron beams. Such coils improve the image quality of a tube by modulating the horizontal deflection velocity of the electron beams. The SVM coil is driven as a function of the video signal. As video rate increases, such as from the NTSC rate to VGA and SVGA rates, the SVM coil should be operated at correspondingly higher frequencies. These higher frequencies result in rapidly changing magnetic fields. According to Faraday's law of induction, the changing magnetic flux will generate internal closed-loop current pathways in any conductor. Additionally, Lenz's law states that the induced eddy currents will produce a flux of magnetic induction which opposes the change in the incident field, thus reducing the magnitude of the magnetic field reaching the electron beams. The magnitude of these currents is dependent on the rate of change of the flux, i.e., frequency. This reduction of the magnetic field necessitates higher power circuits or higher sensitivity coils, and therefore result in undesirable higher cost.
The present invention relates to a color picture tube having a viewing screen and an electron gun within a neck of the tube for generating and directing three inline electron beams, a center beam and two side beams, toward the screen. The electron gun includes a plurality of electrodes including a focus electrode. The tube neck is adapted for receipt of surrounding scan velocity modulation coils at a location thereon. The focus electrode includes two spaced parts that are electrically connected and adapted for connection to the same focus voltage. The space between the parts is surrounded by the neck location for the coils. This space provides an eddy current-free region, thus increasing the resultant magnetic field seen by the electron beams.
In the drawings:
  • FIGURE 1 is a plan view, partly in axial section, of a color picture tube embodying the invention.
  • FIGURE 2 is a side view, partly in axial section, of the electron gun of FIGURE 1, positioned in the tube neck with SVM coils located on the neck.
  • FIGURE 3 is a schematic view of the electron gun of FIGURE 2, showing the electrical connections of the electrodes of the electron gun.
  • FIGURE 4 is a front view of the side of a G5B electrode part that opposes a G5T electrode part in the electron gun of FIGURE 2.
  • FIGURE 5 is a front view of the side of the G5B electrode part that opposes the G5T electrode part in an alternative electron gun.
    • 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 15. The funnel 15 has an internal conductive coating (not shown) that extends from an anode button 16 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 15 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. Alternatively, 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 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 (not shown) that is attached to the tube in the neighborhood of the funnel-to-neck junction. When activated, the yoke 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 details of the electron gun 26 are shown in FIGURES 2, 3 and 4. 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 focus electrode (G5) divided into two parts, 44 (G5B) and 46 (G5T), and a final electrode 48 (G6), spaced in the order named. Each of the G1 through G6 electrodes has 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 G5T electrode part 46 and the G6 electrode 48. The G5B electrode 44 and the G5T electrode are each formed by two pieces, 44B and 44T, and 46B and 46T, respectively.
    All of the electrodes of the electron gun 26 are either directly or indirectly connected to two insulative support rods 50 and 52. Preferably, 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.
    Shown on the neck 14 in FIGURE 2 are two scan modulation (SVM) coils 54 and 56. Each coil is somewhat rectangular and is contoured to conform to the cylindrical shape of the neck. Each coil also includes a large central window which are located opposite to each other on the top and the bottom of the neck. Although such SVM coils have been used on tubes having electron guns with fixed focus voltages, the present inventors have found that the effect of the SVM coils on these tubes can be increased by incorporating an additional space 45 within the electron gun to allow the SVM field to act on the electron beams in an unobstructed manner. The space 45 permits the rapidly changing flux created by the SVM coils to reach the electron beams without suffering the losses caused by the generation of eddy currents in the electrodes. This additional space 45 is formed by longitudinally separating the G5 focus electrode into two parts, the G5B electrode part 44 and the G5T electrode part 46. The coils should surround the space between the parts 44 and 46, but preferably, the space should be located closer to the longitudinal center of the coils than near their ends, as shown in FIGURE 2.
    Electrical connections of the electrodes of the electron gun 26 are shown in FIGURE 3. The G1 electrode is connected to ground. The G2 and G4 are connected to each other and to the G2 voltage VG2, the G3, G5B and G5T are all connected to each other and to a fixed focus voltage VFOCUS, and the G6 is connected to the anode voltage VANODE.
    In the electron gun 26, the facing pieces 44T and 46B of the two electrode parts 44 and 46, respectively, each include a single elongated aperture 47 therein, as shown for part 44T in FIGURE 4. The remote pieces 44B and 46T of the two electrode parts 44 and 46, respectively, include three apertures 60, 62 and 64 therein, for passage of the three electron beams, as shown for part 44T in FIGURE 4. FIGURE 5 shows an alternative embodiment of the parts 44T and 46B, designated with primes of the same items, respectively. This alternative embodiment shows how the shapes and sizes of all of the apertures in electrode parts 44 and 46 can be altered to obtain a particular level of performance. In the portion of the alternative embodiment shown in FIGURE 5, a larger elongated aperture 47' is included in the part 44T' and three larger apertures, 60' 62' and 64' are included in the part 44B'.
    One set of electrode spacings for the electron gun 26 is given in the following table.
    Spacing between cathode and G1 = 0.003" (0.076 mm)
    Spacing between G1 and G2 = 0.009" (0.229 mm)
    Spacing between G2 and G3 = 0.030" (0.762 mm)
    Spacing between G3 and G4 = 0.050" (1.270 mm)
    Spacing between G4 and G5B = 0.050" (1.270 mm)
    Spacing between G5B and G5T = 0.070" (1.778 mm)
    Spacing between G5T and G6 = 0.050" (1.270 mm)

    Claims (3)

    1. A color picture tube (10) having a viewing screen (22), and an electron gun (26) within a neck (14) of said tube for generating and directing three inline electron beams, a center beam and two side beams, toward said screen, characterized by
      said electron gun including a plurality of electrodes including a focus electrode (G5), said focus electrode including two spaced parts (44, 46, 44') that are electrically connected and adapted for connection to the same focus voltage (VFOCUS), wherein facing portions (44T, 46B) of said two spaced parts of said focus electrode each include three apertures (60, 62, 64, 60', 62' 64') therein for passage of the three electron beams, and in at least one of said two spaced parts, said three apertures are set back from a leading edge portion (43, 43') that forms a single elongated aperture (47, 47') therein for passage of the three electron beams.
    2. A color picture tube (10) having a viewing screen (22), and an electron gun (26) within a neck (14) of said tube for generating and directing three inline electron beams, a center beam and two side beams, toward said screen, characterized by
      said electron gun including a plurality of electrodes including a focus electrode (G5), said tube neck being surrounded by a scan velocity modulation coil (54, 56) at a location of the focus electrode, and said focus electrode including two spaced parts (44, 46, 44') that are electrically connected and adapted for connection to the same focus voltage (VFOCUS).
    3. The tube as defined in Claim 2, characterized by facing portions of said two spaced parts (44, 46, 44') of said focus electrode (G5) including each three apertures (60, 62, 64, 60', 62', 64') therein for passage of the three electron beams, and in at least one of said two spaced parts, said three apertures being set back from a leading edge portion (43, 43') that forms a single elongated aperture (47, 47') therein for passage of the three electron beams.
    EP97401593A 1997-07-04 1997-07-04 Color picture tube having an inline electron gun Expired - Lifetime EP0889500B1 (en)

    Priority Applications (8)

    Application Number Priority Date Filing Date Title
    DE69724942T DE69724942D1 (en) 1997-07-04 1997-07-04 Color picture tube with an in-line electron gun
    EP97401593A EP0889500B1 (en) 1997-07-04 1997-07-04 Color picture tube having an inline electron gun
    TW087104456A TW398009B (en) 1997-07-04 1998-03-25 Color picture tube having an inline electron gun
    CN98805715A CN1124635C (en) 1997-07-04 1998-06-30 Color picture tube having an inline electron gun
    JP50736399A JP2002510430A (en) 1997-07-04 1998-06-30 Color picture tube with in-line electron gun
    AU82830/98A AU8283098A (en) 1997-07-04 1998-06-30 Color picture tube having an inline electron gun
    KR1019997012518A KR100360534B1 (en) 1997-07-04 1998-06-30 Color picture tube having an inline electron gun
    PCT/US1998/013757 WO1999001884A1 (en) 1997-07-04 1998-06-30 Color picture tube having an inline electron gun

    Applications Claiming Priority (1)

    Application Number Priority Date Filing Date Title
    EP97401593A EP0889500B1 (en) 1997-07-04 1997-07-04 Color picture tube having an inline electron gun

    Publications (2)

    Publication Number Publication Date
    EP0889500A1 true EP0889500A1 (en) 1999-01-07
    EP0889500B1 EP0889500B1 (en) 2003-09-17

    Family

    ID=8229799

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP97401593A Expired - Lifetime EP0889500B1 (en) 1997-07-04 1997-07-04 Color picture tube having an inline electron gun

    Country Status (8)

    Country Link
    EP (1) EP0889500B1 (en)
    JP (1) JP2002510430A (en)
    KR (1) KR100360534B1 (en)
    CN (1) CN1124635C (en)
    AU (1) AU8283098A (en)
    DE (1) DE69724942D1 (en)
    TW (1) TW398009B (en)
    WO (1) WO1999001884A1 (en)

    Cited By (3)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    EP0991103A1 (en) * 1998-10-01 2000-04-05 Matsushita Electronics (Europe) GmbH Color television or color monitor with a scan-velocity-modulating coil
    EP1480248A2 (en) * 2003-05-20 2004-11-24 Matsushita Electric Industrial Co., Ltd. Electron gun and cathode ray tube device
    KR100778401B1 (en) * 2001-05-08 2007-11-21 삼성에스디아이 주식회사 Electron gun for cathode ray tube

    Families Citing this family (4)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US6750601B2 (en) 2001-09-14 2004-06-15 Lg Philips Displays Korea Co., Ltd. Electron gun for color cathode ray tube
    KR100426569B1 (en) * 2001-09-14 2004-04-08 엘지.필립스디스플레이(주) Electron gun for CRT
    CA2823783C (en) 2011-01-10 2023-03-21 Taris Biomedical, Inc. Lidocaine regimen for the use of sustained treatment of bladder pain and irritative voiding
    KR20140048086A (en) 2011-02-04 2014-04-23 타리스 바이오메디컬 인코포레이티드 Implantable device for controlled release of low solubility drug

    Citations (4)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US4172309A (en) * 1978-07-21 1979-10-30 Zenith Radio Corporation Method of correcting deflection defocusing in self-converged color CRT display systems
    US4406970A (en) * 1981-07-10 1983-09-27 Rca Corporation Color picture tube having an expanded focus lens type inline electron gun with an improved stigmator
    US4429252A (en) * 1982-02-11 1984-01-31 Rca Corporation Color picture tube having an expanded focus lens type inline electron gun with improved static convergence
    US4514659A (en) * 1982-03-04 1985-04-30 Rca Corporation Inline electron gun for high resolution color display tube

    Family Cites Families (2)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    JPS5951440A (en) * 1982-09-16 1984-03-24 Matsushita Electronics Corp In-line type electron gun and manufacturing method thereof
    JPH0640468B2 (en) * 1985-09-09 1994-05-25 松下電子工業株式会社 Color picture tube device

    Patent Citations (4)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US4172309A (en) * 1978-07-21 1979-10-30 Zenith Radio Corporation Method of correcting deflection defocusing in self-converged color CRT display systems
    US4406970A (en) * 1981-07-10 1983-09-27 Rca Corporation Color picture tube having an expanded focus lens type inline electron gun with an improved stigmator
    US4429252A (en) * 1982-02-11 1984-01-31 Rca Corporation Color picture tube having an expanded focus lens type inline electron gun with improved static convergence
    US4514659A (en) * 1982-03-04 1985-04-30 Rca Corporation Inline electron gun for high resolution color display tube

    Cited By (4)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    EP0991103A1 (en) * 1998-10-01 2000-04-05 Matsushita Electronics (Europe) GmbH Color television or color monitor with a scan-velocity-modulating coil
    KR100778401B1 (en) * 2001-05-08 2007-11-21 삼성에스디아이 주식회사 Electron gun for cathode ray tube
    EP1480248A2 (en) * 2003-05-20 2004-11-24 Matsushita Electric Industrial Co., Ltd. Electron gun and cathode ray tube device
    EP1480248A3 (en) * 2003-05-20 2005-09-21 Matsushita Electric Industrial Co., Ltd. Electron gun and cathode ray tube device

    Also Published As

    Publication number Publication date
    DE69724942D1 (en) 2003-10-23
    KR20010014361A (en) 2001-02-26
    WO1999001884A1 (en) 1999-01-14
    KR100360534B1 (en) 2002-11-13
    CN1259226A (en) 2000-07-05
    AU8283098A (en) 1999-01-25
    CN1124635C (en) 2003-10-15
    TW398009B (en) 2000-07-11
    EP0889500B1 (en) 2003-09-17
    JP2002510430A (en) 2002-04-02

    Similar Documents

    Publication Publication Date Title
    EP0424888B1 (en) Color cathode ray tube apparatus
    EP0235975B1 (en) Crt and color display system
    US4520292A (en) Cathode-ray tube having an asymmetric slot formed in a screen grid electrode of an inline electron gun
    EP0889500B1 (en) Color picture tube having an inline electron gun
    EP0251608B1 (en) Color cathode ray tube display system and electron gun therefor
    US4864195A (en) Color display system with dynamically varied beam spacing
    CA2123021C (en) Color picture tube having an inline electron gun with three astigmatic lenses
    EP0251609B1 (en) Color cathode ray tube display system and electron gun therefor
    EP0300706B1 (en) Color picture tube having an inline electron gun with an einzel lens
    KR100215956B1 (en) Color display system
    KR970006037B1 (en) Cathode ray tube with improved electron gun
    US6639344B2 (en) Cathode ray tube having a focus mask and support frame assembly with an improved border
    MXPA00000226A (en) Color picture tube having an inline electron gun
    CA1189561A (en) Color picture tube having an improved inline electron gun
    KR0122504B1 (en) Electron gun and color cathode-ray tube and image display device using the electron gun
    JPH0574369A (en) Picture tube
    JPH06162955A (en) Color cathode-ray tube
    JP2004228020A (en) Cathode-ray tube
    JPH03208238A (en) Color image receiving tube
    JP2001325895A (en) Color cathode-ray tube
    KR20030005605A (en) A Electric Gun For The Color Cathode-ray Tube

    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: A1

    Designated state(s): DE FR GB IT

    17P Request for examination filed

    Effective date: 19990303

    AKX Designation fees paid

    Free format text: DE FR GB IT

    17Q First examination report despatched

    Effective date: 20001110

    GRAH Despatch of communication of intention to grant a patent

    Free format text: ORIGINAL CODE: EPIDOS IGRA

    GRAH Despatch of communication of intention to grant a patent

    Free format text: ORIGINAL CODE: EPIDOS IGRA

    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

    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 FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

    Effective date: 20030917

    REG Reference to a national code

    Ref country code: GB

    Ref legal event code: FG4D

    REF Corresponds to:

    Ref document number: 69724942

    Country of ref document: DE

    Date of ref document: 20031023

    Kind code of ref document: P

    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 FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

    Effective date: 20031218

    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

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

    Ref country code: GB

    Payment date: 20040725

    Year of fee payment: 8

    26N No opposition filed

    Effective date: 20040618

    EN Fr: translation not filed
    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;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

    Effective date: 20050704

    Ref country code: GB

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

    Effective date: 20050704

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

    Effective date: 20050704