WO2006046941A1 - Tube cathodique presentant un ensemble masque de tension et son procede de fabrication - Google Patents

Tube cathodique presentant un ensemble masque de tension et son procede de fabrication Download PDF

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Publication number
WO2006046941A1
WO2006046941A1 PCT/US2004/034868 US2004034868W WO2006046941A1 WO 2006046941 A1 WO2006046941 A1 WO 2006046941A1 US 2004034868 W US2004034868 W US 2004034868W WO 2006046941 A1 WO2006046941 A1 WO 2006046941A1
Authority
WO
WIPO (PCT)
Prior art keywords
strands
edge
tension mask
tensile force
over
Prior art date
Application number
PCT/US2004/034868
Other languages
English (en)
Inventor
Leonard Pratt Wilbur, Jr.
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 PCT/US2004/034868 priority Critical patent/WO2006046941A1/fr
Publication of WO2006046941A1 publication Critical patent/WO2006046941A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/14—Manufacture of electrodes or electrode systems of non-emitting electrodes
    • H01J9/142—Manufacture of electrodes or electrode systems of non-emitting electrodes of shadow-masks for colour television tubes
    • 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
    • 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
    • H01J29/073—Mounting arrangements associated with shadow masks
    • 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
    • H01J2229/0716—Mounting arrangements of aperture plate to frame or vessel

Definitions

  • the present invention relates to a cathode ray tube having tension mask frame assembly and a method of manufacturing a tension mask frame assembly and, more particularly, to a tension mask frame having a pair of opposed cantilever frame members having curved attachment surfaces .
  • a conventional shadow mask type color cathode ray tube generally comprises an electron gun for forming and directing three electron beams to a screen of the tube.
  • the screen is located on the inner surface of the faceplate of the tube and is made up of an array of elements of three different color-emitting phosphors.
  • a shadow mask which is positioned within the tube and near the faceplate, is use ⁇ in printing the screen array and defining the array borders.
  • the shadow mask is precisely interposed between the gun and the screen to replicate the source positions during the screening process.
  • the shadow mask effectively acts as a parallax barrier that shadows the screen and permits the transmitted portions of the electron beams to excite phosphor elements of the respective emissive color on the cathode ray tube screen.
  • the shadow mask is a domed thin sheet of metal capable of self- maintaining its configuration with the inner surface of the tube faceplate and is supported by a mask frame.
  • tension masks Another group of masks commonly used in tubes is tension masks. Some tension masks are designed having tiebars and others have strands. Strand tension masks comprise a plurality of thin parallel strands that are stretched and welded to a rigid mask frame. The stretching of the strands provides the predetermined tension in the vertical dimension which is required to ensure that the apertures formed between the strands remain in alignment with the phosphor elements on the screen.
  • Two different forms of attaching the strands to a frame can be found in conventional tubes.
  • One form includes a border surrounding the central apertures of the mask which is welded to the frame.
  • the solid border of the mask serves as an optical edge for forming the black surround of the matrix which in turn defines the borders of the screen array of the tube screen.
  • a secondary purpose of the solid mask border is to provide an electron shield at the edge of the active scan region so as to reduce undesirable electron scattering during vertical overscan. It has also been found desirable to make the tension mask and the mask frame from different materials to reduce the required mask tension and weight of the mask-frame assembly. In commercial tension mask tubes, solid borders of the mask are welded to the mask frame.
  • the invention provides a cathode ray tube having a tension mask assembly and a method of manufacturing the same.
  • the tension mask assembly includes a strand tension mask having non-edged border sections and a support frame including two opposing support blade members having curved edges to which the strands of the mask are secured.
  • the method comprises supporting the strands by the unetched border sections of the mask over the over the support blade members and applying a tensile force to the strands to maintain uniform alignment of the strands relative to each other with minimum tension load on the strands.
  • the strands are then secured to the curved edges of the support blade members by relieving the tensile force and heating.
  • Figure 1 is a cross sectional view of a CRT according to the present invention.
  • Figure 2 is a perspective view of a tension mask and frame assembly according to the present invention. >
  • Figure 3 is an exploded perspective view of an edge area of the tension mask assembly as shown in Figure 2.
  • Figure 4 is a front planar view of the tension mask used in the assembly of Figure 2.
  • Figure 5 shows a schematic view of the pneumatic jig wherein the tension mask strands are under pressure.
  • Figure 6 shows the pneumatic jig similar to Figure 5 wherein pressure on the strands has been reduced to a desirable level.
  • Figure 7 shows the circular welding apparatus making a pass over an edge of the support blade member.
  • Figure 8 is a side view of a support blade member in the frame assembly of Figure 2.
  • Figure 9 is a cross sectional view of the support blade member and tension mask of Figure 3.
  • FIG. 1 shows a cathode ray tube (CRT) 1 having a glass envelope 2 comprising a rectangular faceplate panel 3 and a tubular neck 4 connected by a funnel 5.
  • the funnel 5 has an internal conductive coating (not shown) that extends from an anode button 6 toward the faceplate panel 3 and to the neck 4.
  • the faceplate panel 3 comprises a viewing faceplate 8 and a peripheral flange or sidewall 9, which is sealed to the funnel 5 by a glass frit 7.
  • a three- color phosphor screen 12 is carried by the inner surface of the faceplate panel 3.
  • the screen 12 is a line screen with the phosphor lines arranged in triads, each of the triads including a phosphor line of each of the three colors.
  • a tension mask support frame assembly 10 is removably mounted in predetermined spaced relation to the screen 12.
  • An electron gun 13, shown schematically by dashed lines in Figure 1, is centrally mounted within the neck 4 to generate and direct three inline electron beams, a center beam and two side or outer beams, along convergent paths through the tension mask frame assembly 10 to the screen 12.
  • the CRT 1 is designed to be used with an external magnetic deflection yoke 14 shown in the neighborhood of the runnel-to-neck junction. When activated, the yoke 14 subjects the three beams to magnetic fields which cause the beams to scan horizontally and vertically in a rectangular raster over the screen 12.
  • the tension mask support frame assembly 10 has a frame 20 which includes two long sides 22 and 24, and two short sides 26 and 28.
  • the two long sides 22, 24 of the tension mask support frame assembly 10 are parallel to a central major axis, X, of the tube; and the two short sides 26, 28 are parallel to a central minor axis, Y, of the tube.
  • the sides 22, 24, 26, 28 are preferably formed of rectangular tubular material. It should be understood however that other geometry tubular, materials or other solid materials could be utilized to form these sides.
  • the two long sides 22, 24 and two short sides 26, 28 preferably form a continuous mask support frame 20 and lie in a common plane generally parallel to a tension mask 30.
  • a pair of support blade members 40 are mounted on the two long sides 22, 24.
  • the tension mask support frame assembly 10 further includes a tension mask 30 supported by edges 42 of each support blade member 40 as will be described below.
  • the tension mask 30 is formed from a thin sheet of metal such as steel which is etched or otherwise processed to produce a plurality of strands 36 between unetched sections 33.
  • the strands 36 extend between and are attached to the support blade members 40 parallel to the minor axis Y. It should be understood, however, that although the strands 36 are shown here extending parallel to the minor axis Y, designs are conceivable in which the strands 36 extend parallel to the major axis X and the support blade members 40 are located parallel to the minor axis Y.
  • An optional border may also be attached over the strand and the support blade member interface to create an optical edge or to provide additional mechanical support.
  • the support blade member 40 can have a curved edge 42.
  • the curved edge 42 is formed to have a radius ⁇ such that it has a high point 43 located between a pair of low points 44.
  • the radius is created to provide a smooth edge surface onto which the strands 36 may be welded as best shown in Figure 9.
  • a single strand 36 is shown extending over the curved edge 42 of the support blade member 40.
  • the strand 36 is attached to the high point 43 by a weld 62 leaving small spaces between the low points 44 and the strand 36.
  • the optional border may also be attached over the strands 36 at the weld 62.
  • the curved edge 42 is rounded and smoothed to remove sharp edges as shown in Figure 8.
  • the curved edge 42 may be rounded with a slight radius ⁇ , for example a radius of 0.375 inch and then smoothened. The rounding and smoothing operation is performed to remove any sharp edges from the support blade member 40 which may contribute to breaking the strands during the welding process.
  • Sharp edges are undesirable because they act as a cutting surface along the strands 36 as the strands 36 soften during the welding process.
  • the support blade members 40 are placed in tension by applying an inward force on each support blade member 40 near the curved edge 42 using known techniques.
  • the plurality of strands 36 are laid over the support blade member 40 such that they extend beyond respective edges 42.
  • the tension mask 30 is held in place by a pneumatic jig 50 holding the unetched sections 33 as shown in Figure 5.
  • the strands 36 are held taut by the jig 50 in order to maintain the strands properly positioned in uniform alignment relative to each other.
  • the pneumatic jig 50 has at least one pneumatic cylinder 52, a shaft 54 extending from the pneumatic cylinder 52 and an attachment arm 56 which is driven by the shaft 54. Pressure is applied to the pneumatic cylinder 52 as shown by the indicator 51 such that the pneumatic jig 50 applies a tension on the strands 36 along their length which is parallel to the minor axis Y in this example.
  • the pneumatic jig 50 operates to keep the strands 36 taut by applying a small tensile force which is sufficient to maintain alignment but prevent the strands 36 from breaking during the subsequent welding steps.
  • a welding apparatus 60 such as a welding wheel is rolled or otherwise moved along the edge 42 in a first pass over the strands 36 in order to spot weld or otherwise attach each strand 36 to the curved edge 42.
  • the welding apparatus 60 applies intermittent current in pulses shown schematically by the gauge 64 to form welds 62 at desired locations along the strands 36.
  • the current on/off pulse frequency is determined such that it is statistically very probable to form at least one spot weld on each strand 36 as the welding apparatus 60 rolls over the edge 42.
  • a second pass may be made with the welding apparatus 60 in the reverse direction to ensure that each strand 36 is properly attached the curved edge 42.
  • the optional border may then be applied over the welded strands 36 and edge 42 to protect the strand edges.
  • Tension on the support blade members 40 is then removed to place the attached tension mask 30 in tension.
  • the edges of the strands 36 may be trimmed to be flush with the curved edge 42.
  • the first pass of the welding apparatus may include reduced current pulses at, for example, forty percent of full current with subsequent passes having increased current to form the welds.
  • Current and pulse rate may be adjusted in each pass to reduce heating or increase heating of the strands to desired levels for each pass so as to prevent strand breakage during the welding process and during subsequent tube processing operations.
  • An advantage of the process described here is that strands 36 can be accurately positioned along the edges 42 and reliably attached directly to the curved edges 42 without breaking during the process.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)

Abstract

La présente invention concerne un tube cathodique (1) présentant un ensemble masque de tension (10) et son procédé de fabrication. L'ensemble masque de tension comprend un masque de tension toronné ayant des sections de bord non tranchantes (33) et une pluralité de torons (36) qui sont supportés par un cadre de support de masque de tension (20). Le cadre de support de masque de tension comprend deux éléments lames de support opposés (40) présentant des bords incurvés auxquels sont fixés les torons du masque. Le procédé comprend les étapes consistant à placer en support les torons par l'intermédiaire des sections non tranchantes du masque sur les éléments lames de support et à appliquer un effort de traction sur les torons afin de maintenir un alignement uniforme des torons. Les torons sont alors fixés aux bords incurvés des éléments lames de support par soudure et par relâchement de l'effort de traction.
PCT/US2004/034868 2004-10-21 2004-10-21 Tube cathodique presentant un ensemble masque de tension et son procede de fabrication WO2006046941A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US2004/034868 WO2006046941A1 (fr) 2004-10-21 2004-10-21 Tube cathodique presentant un ensemble masque de tension et son procede de fabrication

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2004/034868 WO2006046941A1 (fr) 2004-10-21 2004-10-21 Tube cathodique presentant un ensemble masque de tension et son procede de fabrication

Publications (1)

Publication Number Publication Date
WO2006046941A1 true WO2006046941A1 (fr) 2006-05-04

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ID=34959095

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2004/034868 WO2006046941A1 (fr) 2004-10-21 2004-10-21 Tube cathodique presentant un ensemble masque de tension et son procede de fabrication

Country Status (1)

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WO (1) WO2006046941A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5594300A (en) * 1995-11-15 1997-01-14 Thomson Consumer Electronics, Inc. Color picture tube having a tensioned mask and compliant support frame assembly
US5952774A (en) * 1997-04-18 1999-09-14 Thomson Consumer Electronics, Inc. Color CRT having a support frame assembly with detensioning means
EP1306875A2 (fr) * 2001-10-29 2003-05-02 Thomson Licensing S.A. Masque sous tension pour tube à rayons cathodiques
JP2003173747A (ja) * 2001-12-06 2003-06-20 Mitsubishi Electric Corp 色選別電極用支持部材、色選別電極、色選別電極の製造方法、及び、溶接電極
US20040183425A1 (en) * 2003-03-19 2004-09-23 Shinichi Ooe Color-separating electrode structure and apparatus for manufacturing same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5594300A (en) * 1995-11-15 1997-01-14 Thomson Consumer Electronics, Inc. Color picture tube having a tensioned mask and compliant support frame assembly
US5952774A (en) * 1997-04-18 1999-09-14 Thomson Consumer Electronics, Inc. Color CRT having a support frame assembly with detensioning means
EP1306875A2 (fr) * 2001-10-29 2003-05-02 Thomson Licensing S.A. Masque sous tension pour tube à rayons cathodiques
JP2003173747A (ja) * 2001-12-06 2003-06-20 Mitsubishi Electric Corp 色選別電極用支持部材、色選別電極、色選別電極の製造方法、及び、溶接電極
US20040183425A1 (en) * 2003-03-19 2004-09-23 Shinichi Ooe Color-separating electrode structure and apparatus for manufacturing same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2003, no. 10 8 October 2003 (2003-10-08) *

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