EP0654811A1 - Farbbildröhre mit dosenförmiger Lochmaskenrahmenstruktur - Google Patents

Farbbildröhre mit dosenförmiger Lochmaskenrahmenstruktur Download PDF

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Publication number
EP0654811A1
EP0654811A1 EP94117908A EP94117908A EP0654811A1 EP 0654811 A1 EP0654811 A1 EP 0654811A1 EP 94117908 A EP94117908 A EP 94117908A EP 94117908 A EP94117908 A EP 94117908A EP 0654811 A1 EP0654811 A1 EP 0654811A1
Authority
EP
European Patent Office
Prior art keywords
frame
mask
box
frame assembly
color picture
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP94117908A
Other languages
English (en)
French (fr)
Inventor
Paolo Spina
Pedro Eugenio Cosma
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.)
Videocolor SpA
Original Assignee
Videocolor SpA
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 Videocolor SpA filed Critical Videocolor SpA
Publication of EP0654811A1 publication Critical patent/EP0654811A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—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
    • H01J2229/0722—Frame
    • 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
    • H01J2229/0766—Details of skirt or border
    • H01J2229/0772—Apertures, cut-outs, depressions, or the like

Definitions

  • This invention relates to color picture tubes of the type having shadow masks attached to frames that are suspended in relation to cathodoluminescent screens, and particularly to an improved, lighter-weight mask-frame assembly.
  • tubes have frames that are made from materials that are from about 1.00 mm (0.039 inch) thick to about 1.51 mm (0.062 inch) thick.
  • the frames are usually rectangularly shaped and supported within faceplate panels by three or four springs that are attached to the sides of the frames; alternatively, the frames may be supported at their four corners. Embodiments for achieving such corner support are shown in U.S. Patent 4,723,088, issued to Sone et al. on February 2, 1988, and in U.S. Patent 4,728,853, issued to Sone et al. on March 1, 1988.
  • the present invention provides a shadow mask assembly that utilizes a very lightweight frame.
  • An improved color picture tube in accordance with the present invention includes an evacuated envelope having a rectangular faceplate panel.
  • the panel includes a viewing screen on an inner surface thereof and a mask-frame assembly mounted therein.
  • the mask-frame assembly includes a shadow mask attached to a peripheral frame.
  • the improvement comprises the frame including a box-like enclosure that extends around the periphery of the mask.
  • the frame material has approximately the same thickness as does the shadow mask material.
  • FIGURE 1 shows a rectangular color picture tube 8 having a glass envelope 10, comprising a rectangular faceplate panel 12 and a tubular neck 14 connected by a rectangular funnel 16.
  • the panel 12 comprises a viewing faceplate 18 and a peripheral flange or sidewall 20, which is sealed to the funnel 16.
  • a mosaic three-color phosphor screen 22 is located on the inner surface of the faceplate 18.
  • the screen preferably is a line screen, with vertically extending parallel phosphor lines. Alternatively, the screen may be a dot screen.
  • a multiapertured color selection electrode or shadow mask 24 is attached to a peripheral frame 25, which is removably mounted in predetermined spaced relation to the screen 22.
  • An electron gun 26 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 28 located in the vicinity of the funnel-to-neck junction.
  • the yoke 28 subjects the three electron beams to magnetic fields which cause the beams to scan horizontally and vertically in a rectangular raster over the screen 22.
  • FIGURES 2 and 3 show the frame 25 in greater detail.
  • the frame 25 is made out of two pieces 30 and 31 that are L-shaped in cross-section and are welded together to form a box-shaped structure.
  • the material of the two pieces 30 and 31 is approximately the same thickness as the mask material, e.g., 0.229 mm (0.009 inch). This is considerably thinner than a prior art frame which can be about 1.51 mm (0.062 inch) thick. Therefore, the frame 25 weighs considerably less than a conventional prior art frame.
  • the shadow mask 24, shown in greater detail in FIGURE 4, comprises an apertured contoured portion 27 surrounded by a peripheral skirt 32.
  • the shadow mask is attached to the frame 25, which, in turn, is mounted within the faceplate panel 12 by support means located either at the four corners of the mask or along the sides thereof.
  • FIGURE 5 shows a mask-frame assembly 36 that includes a frame 38 constructed of two pieces 40 and 42 that form a triangular-shaped box-like structure.
  • a flange 44 outwardly extending from a mask 46, is attached to a corresponding flange 47 on the frame 38.
  • a mask-frame assembly 48 includes a frame 50 constructed out of a single piece that is formed into a rectangular cross-section.
  • a mask and frame assembly constructed in accordance with the present invention uses a minimum amount of material and is lighter than an assembly of more conventional construction. This results in cost reduction, better thermal performance and reduced warpage during long-term operation.
  • the thinner material of the frame is easier to machine, and the completed mask and support are still sufficiently strong to withstand mechanical shocks and vibrations.

Landscapes

  • Electrodes For Cathode-Ray Tubes (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
EP94117908A 1993-11-19 1994-11-12 Farbbildröhre mit dosenförmiger Lochmaskenrahmenstruktur Withdrawn EP0654811A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT93MI002460A IT1265203B1 (it) 1993-11-19 1993-11-19 Tubo per la riproduzione di immagini a colori dotato di un compelsso maschera-telaio perfezionato
ITMI932460 1993-11-19

Publications (1)

Publication Number Publication Date
EP0654811A1 true EP0654811A1 (de) 1995-05-24

Family

ID=11367232

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94117908A Withdrawn EP0654811A1 (de) 1993-11-19 1994-11-12 Farbbildröhre mit dosenförmiger Lochmaskenrahmenstruktur

Country Status (5)

Country Link
EP (1) EP0654811A1 (de)
JP (1) JPH07192646A (de)
KR (1) KR950015500A (de)
CN (1) CN1111393A (de)
IT (1) IT1265203B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0774771A1 (de) * 1995-11-15 1997-05-21 Thomson Consumer Electronics, Inc. Farbbildröhre mit einer gespannten Maske und einem nachgiebigen Stützrahmen
NL1003329C2 (nl) * 1995-07-04 1998-01-28 Lg Electronics Inc Raamconstructie voor een kathodestraal buis.
WO1999034391A1 (en) * 1997-12-23 1999-07-08 Koninklijke Philips Electronics N.V. Color cathode ray tube with improved shadow mask mounting system
WO2006054014A1 (fr) * 2004-11-18 2006-05-26 Thomson Licensing Ensemble cadre/masque pour tube a rayons cathodiques

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19980022929A (ko) * 1996-09-24 1998-07-06 손욱 음극선관용 섀도우 마스크 프레임 조립체
US6084342A (en) * 1998-07-08 2000-07-04 Thomson Licensing S.A. Color picture tube having a tensioned mask-support frame assembly

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5688239A (en) * 1979-12-19 1981-07-17 Hitachi Ltd Shadow mask assembly
US4700105A (en) * 1985-09-30 1987-10-13 Mitsubishi Denki Kabushiki Kaisha Shadow mask mount for color picture tube
US5021707A (en) * 1989-11-17 1991-06-04 Rca Licensing Corporation Color picture tube having shadow mask with improved support
US5072151A (en) * 1991-01-14 1991-12-10 Videocolor S.P.A. Color picture tube having improved shadow mask frame

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5688239A (en) * 1979-12-19 1981-07-17 Hitachi Ltd Shadow mask assembly
US4700105A (en) * 1985-09-30 1987-10-13 Mitsubishi Denki Kabushiki Kaisha Shadow mask mount for color picture tube
US5021707A (en) * 1989-11-17 1991-06-04 Rca Licensing Corporation Color picture tube having shadow mask with improved support
US5072151A (en) * 1991-01-14 1991-12-10 Videocolor S.P.A. Color picture tube having improved shadow mask frame

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 5, no. 159 (E - 77)<831> 14 October 1981 (1981-10-14) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1003329C2 (nl) * 1995-07-04 1998-01-28 Lg Electronics Inc Raamconstructie voor een kathodestraal buis.
EP0774771A1 (de) * 1995-11-15 1997-05-21 Thomson Consumer Electronics, Inc. Farbbildröhre mit einer gespannten Maske und einem nachgiebigen Stützrahmen
WO1999034391A1 (en) * 1997-12-23 1999-07-08 Koninklijke Philips Electronics N.V. Color cathode ray tube with improved shadow mask mounting system
WO2006054014A1 (fr) * 2004-11-18 2006-05-26 Thomson Licensing Ensemble cadre/masque pour tube a rayons cathodiques

Also Published As

Publication number Publication date
IT1265203B1 (it) 1996-10-31
KR950015500A (ko) 1995-06-17
ITMI932460A1 (it) 1995-05-19
ITMI932460A0 (it) 1993-11-19
CN1111393A (zh) 1995-11-08
JPH07192646A (ja) 1995-07-28

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