WO2005020270A1 - Cadre de masque de tension pour tube cathodique presentant un balayage transversal - Google Patents

Cadre de masque de tension pour tube cathodique presentant un balayage transversal Download PDF

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Publication number
WO2005020270A1
WO2005020270A1 PCT/US2003/026029 US0326029W WO2005020270A1 WO 2005020270 A1 WO2005020270 A1 WO 2005020270A1 US 0326029 W US0326029 W US 0326029W WO 2005020270 A1 WO2005020270 A1 WO 2005020270A1
Authority
WO
WIPO (PCT)
Prior art keywords
frequency distribution
center portion
tension mask
edge portions
mask
Prior art date
Application number
PCT/US2003/026029
Other languages
English (en)
Inventor
Joseph Arthur Reed
Original Assignee
Thomson Licensing
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 Licensing filed Critical Thomson Licensing
Priority to CNA038269333A priority Critical patent/CN1849689A/zh
Priority to JP2005508274A priority patent/JP2007521609A/ja
Priority to AU2003262732A priority patent/AU2003262732A1/en
Priority to US10/567,716 priority patent/US20060255708A1/en
Priority to EP03818354A priority patent/EP1656686A4/fr
Priority to PCT/US2003/026029 priority patent/WO2005020270A1/fr
Publication of WO2005020270A1 publication Critical patent/WO2005020270A1/fr

Links

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
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/06—Screens for shielding; Masks interposed in the electron stream
    • H01J29/07—Shadow masks for colour television tubes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/07—Shadow masks
    • H01J2229/0727—Aperture plate
    • H01J2229/0738—Mitigating undesirable mechanical effects
    • H01J2229/0744—Vibrations

Definitions

  • a color picture tube includes an electron gun for generating and directing three electron beams toward a screen of the tube.
  • An external magnetic deflection yoke subjects the three electron beams to magnetic fields that cause the electron beams to scan horizontally and vertically in a rectangular raster over the screen.
  • the screen is located on the inner surface of the faceplate of the tube and comprises an array of elements of three different color emitting phosphors.
  • An aperture mask is interposed between the electron gun and the screen to permit each electron beam to strike only the phosphor elements associated with that beam.
  • the aperture mask is a thin sheet of metal, such as steel or a nickel-iron alloy (INVAR ® ), that is parallel with the inner surface of the tube faceplate.
  • the aperture mask may be either formed or tensioned.
  • Some cathode-ray tubes include high aspect ratios for the viewing screen (e.g., an 16:9 aspect ratio). Such high aspect ratios for the viewing screen requires the magnetic deflection yoke to use high deflection angles for scanning horizontally and vertically in a rectangular raster across the screen of the tube. High deflection angles for scanning horizontally and vertically in a rectangular raster across the screen increases the current requirements for the deflection yoke. A high current requirement for the deflection yoke undesirably increases the complexity and cost of such deflection yoke and chassis electronics as well as the power consumption required to operate the cathode ray tube. Thus, a need exists for a cathode-ray tube including a high aspect ratio for the viewing screen with improved current requirements for the magnetic deflection yoke.
  • the present invention relates to a high aspect ratio cathode-ray tube (CRT) including a luminescent screen, an aperture mask configured for transverse scan, an electron gun and a magnetic deflection yoke.
  • CTR cathode-ray tube
  • the electron gun and the magnetic deflection yoke are positioned so that electron beams generated in the gun scan a rectangular raster across the luminescent screen parallel to the tube minor axis (transverse scan) to improve the current requirements for the magnetic deflection yoke.
  • the aperture mask configured for transverse scan is interposed between the electron gun and the screen to permit each electron beam to strike only phosphor elements associated with that beam.
  • the aperture mask is a tensioned mask having a center portion and edge portions.
  • the center portion has a central frequency distribution and the edge portions have peripheral frequency distributions.
  • the central frequency distribution is greater than the peripheral frequency distributions.
  • the frequency distribution from the edge portions to the center portion is represented by a parabolic formula in which the variational range, ⁇ , between the peak value for the frequency distribution at the center portion and the minimum value for the frequency distribution at the edge portions is in the closed interval of about 8 Hz ⁇ ⁇ ⁇ 12 Hz.
  • FIG. 2 is a plan view of the tension mask-frame-assembly of FIG. 1 according to an aspect of the invention
  • FIG. 3 is a graph depicting modal shapes for various mask tension distributions
  • FIG. 4 depicts a bar graph showing mask tension ranges as limited by scan frequencies
  • FIG. 5 is a summary of mask frame design parameters for several high aspect ratio (16:9) cathode ray tubes (CRT) using transverse scan as compared to horizontal scan.
  • CTR cathode ray tubes
  • FIG. 1 shows a cathode ray tube 10 having a glass envelope 12 comprising a rectangular faceplate panel 14 and a tubular neck 16 connected by a rectangular funnel 18.
  • the funnel 18 has an internal conductive coating (not shown) that extends from an anode button 20 to a neck 16.
  • the panel 14 comprises a viewing faceplate 22 and a peripheral flange or sidewall 24 that is sealed to the funnel 18 by a glass frit 26.
  • a three-color phosphor screen 28 is formed on the inner surface of the faceplate 22.
  • the screen 28 is a line screen with the phosphor lines arranged in triads, each triad including a phosphor line of each of the three colors.
  • a tension mask-frame assembly 30 configured for transverse scan is removably mounted in a predetermined spaced relation to the screen 28.
  • An electron gun 32 (schematically shown with dashed lines in FIG. 1) is centrally mounted within the neck 16 to generate three in-line electron beams, a center beam and two side beams, along convergent paths through the mask 30 to the screen 28.
  • the tube 10 is designed to be used with an external magnetic deflection yoke, such as the yoke 34 shown in the neighborhood of the funnel-to-neck junction.
  • the tension mask-frame assembly 30 configured for transverse scan, shown in greater detail in FIG. 2, is interconnected with a peripheral frame 39 that includes two long sides 36, 38 and two short sides 40, 42.
  • the two long sides 36, 38 of the tension mask-frame assembly 30 are parallel to a central major axis, X, of the tube.
  • the tension mask includes an aperture portion that contains a plurality of metal strips 44 having a plurality of elongated slits 46 therebetween that parallel the minor axis of the tension mask-frame assembly 30.
  • the elongated slits 46 may alternatively parallel the major axis of the tension mask-frame assembly 30.
  • the aperture portion of tension mask-frame assembly 30 illustrated in FIG. 2 is a tie bar or webbed system.
  • the tension mask 30 has a center portion 50, with mask edge portions 52 that are about 0.5 inches from the edge of the frame short sides 40, 42 and mask edge portions 51 that are about 1.0 inches from the edge of the frame long sides 36, 38.
  • the two mask edge portions 52 are parallel to the tube 10 central minor axis, Y.
  • the two mask edge portions 51 are parallel to the tube 10 central major axis, X.
  • the two mask edge portions 52 are attached to the peripheral frame 39 along the two sides 40, 42.
  • the natural frequency distribution across any complete vertical (central minor axis, Y) dimension of the tension mask 30 provides a useful way of comparing any tube to any other tube, regardless of size. Effectively, the natural frequency distribution, which is a function of the respective tension distribution and the horizontal dimension of the tension mask 30, is a universal metric that dictates the microphonic behavior of tubes.
  • the natural frequency distribution for transverse scan across the central minor axis, Y is a substantially parabolic function that is substantially smooth and continuous.
  • the natural frequency distribution comprises a central frequency distribution for the center portion 50 and peripheral frequency distributions for the edge portions 51 , wherein the values of the central frequency distribution are constructively greater than the values of the peripheral frequency distribution.
  • the difference between the maximum of the central frequency distribution and the minimum of the peripheral frequency distribution is preferably about 10 Hz.
  • FIG. 3 is a graph 300 depicting modal shapes for various tension distributions.
  • the graph 300 is defined by normal displacement (axis 302) and minor axis location (axis 304). Specifically, the graph 300 shows which portion of the tension mask 30 is excited by vibrations for a flat, "smile” or “frown” tension.
  • the tension mask 30 with a “smile” shows considerably more vibration in the center portion 50 than a tension mask 30 with a “frown” (plot 308). Additionally, there is more vibration in the center portion 50 of a tension mask 30 having an even tension distribution (plot 310) than for a tension mask 30 having a "frown".
  • a tension mask 30 having a "frown” has resonant frequencies that are more broadly spaced than a tension mask 30 having a "smile” or flat distribution.
  • a tension distribution configured for transverse scan in accordance with the present invention for producing a parabolic "frown" at frequencies within a range of about 80 Hz to about 90 Hz may be represented by:
  • f(y) represents the frequency distribution over y (minor axis, Y)
  • L represents one-half of the total length of tension mask 30 along the minor axis
  • y represents a minor axis position from -L to +L, wherein the absolute value of L is normalized to 1.
  • FIG. 4 provides some guidance in constructing tension masks with good microphonic performance.
  • the bar graph 400 in FIG. 4 shows mask tension ranges as limited by scan frequencies (axis 402). Specifically, different bars occupy certain scanning frequencies with about a 20 Hz cushion.
  • Excessive vibration occurs in the frequency range of 0 Hz to about 40 Hz.
  • the 50 Hz European television broadcast format 1 H Phase Alternate Line (PAL) (bar 406) excludes the frequency range from about 40 Hz to about 60 Hz.
  • the 60 Hz American television broadcast format 1 H (NTSC) (bar 408) excludes the frequency range from about 50 Hz to about 70 Hz.
  • the 100 Hz European broadcast format 2H PAL (bar 410) excludes the frequency range from about 90 Hz to about 110 Hz.
  • the 120 Hz American broadcast format 2H NTSC (bar 412) excludes the frequency range from about 110 Hz to about 130 Hz.
  • FIG. 5 summarizes frame design parameters for several high aspect ratio
  • the mask stress (psi) and frame load (Ibf) as a function of two frequencies (e.g., 80 Hz and 90 Hz) are provided for transverse scan as compared to horizontal scan for several different size cathode ray tubes.
  • the mask may be fabricated, for example, of a nickel-iron alloy (e.g., INVAR ® ) having a thickness of about 0.004 inches.
  • INVAR ® nickel-iron alloy
  • the present invention can be practically achieved on all current tube sizes (e.g., W76, W86 and W97, among others).
  • a W7630-inch cinema screen tube experiences less mask stress and frame load than a W86 34-inch cinema screen tube at frequencies of about 80 Hz to about 90 Hz.
  • the W86 34-inch cinema screen tube experiences less mask stress and frame load than a W9738-inch cinema screen tube at frequencies of about 80 Hz to about 90 Hz.
  • tubes using transverse scan require higher mask stress loads to achieve the desired frequency distribution than tubes using horizontal scan.
  • a W76 30-inch cinema screen tube using transverse scan experiences higher mask stress and frame load than a W76 30-inch cinema screen tube using horizontal scan at frequencies of about 80 Hz to about 90 Hz.
  • the W8634-inch cinema screen tube using transverse scan experiences higher mask stress and frame load than a W86 34-inch cinema screen tube using horizontal scan at frequencies of about 80 Hz to about 90 Hz.
  • the W9738-inch cinema screen tube using transverse scan experiences higher mask stress and frame load than a W9738-inch cinema screen tube using horizontal scan at frequencies of about 80 Hz to about 90 Hz.

Landscapes

  • Electrodes For Cathode-Ray Tubes (AREA)

Abstract

La présente invention a trait à un tube cathodique à rapport de forme élevé comportant un écran luminescent (28), un masque perforé (30) agencé pour un balayage transversal, un canon électronique (32) et une bobine de déviation magnétique (34). Le canon électronique (32) et la bobine de déviation magnétique (34) sont positionnés de sorte que les faisceaux d'électrons générés dans le canon (32) balayent une trame rectangulaire sur toute la largeur de l'écran luminescent parallèle au petit axe du tube (balayage transversal) pour améliorer les besoins en courant pour la bobine de déviation magnétique (34).
PCT/US2003/026029 2003-08-20 2003-08-20 Cadre de masque de tension pour tube cathodique presentant un balayage transversal WO2005020270A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
CNA038269333A CN1849689A (zh) 2003-08-20 2003-08-20 用于具有横向扫描的阴极射线管(crt)的拉伸荫罩框架
JP2005508274A JP2007521609A (ja) 2003-08-20 2003-08-20 横断走査を有する陰極線管（ｃｒｔ）用のテンションマスクフレーム
AU2003262732A AU2003262732A1 (en) 2003-08-20 2003-08-20 Tension mask frame for a cathode-ray tube (crt) having transverse scan
US10/567,716 US20060255708A1 (en) 2003-08-20 2003-08-20 Tension mask frame for a cathode-ray tube (crt) having transverse scan
EP03818354A EP1656686A4 (fr) 2003-08-20 2003-08-20 Cadre de masque de tension pour tube cathodique presentant un balayage transversal
PCT/US2003/026029 WO2005020270A1 (fr) 2003-08-20 2003-08-20 Cadre de masque de tension pour tube cathodique presentant un balayage transversal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2003/026029 WO2005020270A1 (fr) 2003-08-20 2003-08-20 Cadre de masque de tension pour tube cathodique presentant un balayage transversal

Publications (1)

Publication Number Publication Date
WO2005020270A1 true WO2005020270A1 (fr) 2005-03-03

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PCT/US2003/026029 WO2005020270A1 (fr) 2003-08-20 2003-08-20 Cadre de masque de tension pour tube cathodique presentant un balayage transversal

Country Status (5)

Country Link
EP (1) EP1656686A4 (fr)
JP (1) JP2007521609A (fr)
CN (1) CN1849689A (fr)
AU (1) AU2003262732A1 (fr)
WO (1) WO2005020270A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8235156B2 (en) 2007-05-26 2012-08-07 Micheal James Koss Retrofitable ROPS reinforcement structure for cab raiser interface

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0984482A2 (fr) * 1998-09-01 2000-03-08 Matsushita Electronics Corporation Tube à rayons cathodique

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW480519B (en) * 1999-10-21 2002-03-21 Matsushita Electric Ind Co Ltd Cathode ray tube and image display apparatus using the samd
CN1194369C (zh) * 1999-10-22 2005-03-23 松下电器产业株式会社 阴极射线管和使用该阴极射线管的图像显示装置
JP2002373598A (ja) * 2001-06-13 2002-12-26 Nec Kansai Ltd シャドウマスク構体およびカラーブラウン管

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0984482A2 (fr) * 1998-09-01 2000-03-08 Matsushita Electronics Corporation Tube à rayons cathodique

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP1656686A4 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8235156B2 (en) 2007-05-26 2012-08-07 Micheal James Koss Retrofitable ROPS reinforcement structure for cab raiser interface

Also Published As

Publication number Publication date
EP1656686A4 (fr) 2008-07-16
CN1849689A (zh) 2006-10-18
JP2007521609A (ja) 2007-08-02
AU2003262732A1 (en) 2005-03-10
EP1656686A1 (fr) 2006-05-17

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