EP1098349B1 - Maskentragrahmen-Struktur für Kathodenstrahlröhre - Google Patents

Maskentragrahmen-Struktur für Kathodenstrahlröhre Download PDF

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Publication number
EP1098349B1
EP1098349B1 EP20000403034 EP00403034A EP1098349B1 EP 1098349 B1 EP1098349 B1 EP 1098349B1 EP 20000403034 EP20000403034 EP 20000403034 EP 00403034 A EP00403034 A EP 00403034A EP 1098349 B1 EP1098349 B1 EP 1098349B1
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EP
European Patent Office
Prior art keywords
mask
cathode ray
ray tube
tube according
previous
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.)
Expired - Lifetime
Application number
EP20000403034
Other languages
English (en)
French (fr)
Other versions
EP1098349A1 (de
Inventor
Fabrizio Berton
Pierluigi Testa
Joseph Artur Reed
Renzo Incagli
Pedro E. 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
Priority claimed from IT1999MI002324A external-priority patent/IT1313924B1/it
Priority claimed from IT2000MI001480A external-priority patent/IT1318092B1/it
Application filed by Videocolor SpA filed Critical Videocolor SpA
Publication of EP1098349A1 publication Critical patent/EP1098349A1/de
Application granted granted Critical
Publication of EP1098349B1 publication Critical patent/EP1098349B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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

  • the present invention relates to a mask structure of selection of colors for cathode ray tube in colors.
  • the invention finds its application in any type of tube with a mask of selection of colors and is particularly suitable for tubes whose mask is maintained in tension by the frame on which it is secured.
  • Conventional cathode ray tubes comprise a mask of selection of colors located at a precise distance from the inside of the face front glass tube, front face on which are deposited networks of red, green and blue phosphors to form a screen.
  • a gun to electrons arranged inside the tube, in its rear part, generates three electron beams in the direction of the front face.
  • Deflection devices electromagnetic, usually arranged outside the tube and close to the The function of the electron gun is to deflect electron beams in order to have them scan the surface of the panel on which the networks are of phosphors. Under the influence of three electron beams corresponding each to a particular primary color, the networks of phosphors allow the reproduction of images on the screen, the mask allowing each determined beam to illuminate only the luminophore of the corresponding color.
  • the color selection mask must be arranged and maintained during the operation of the tube in a precise position inside the tube.
  • the functions of maintaining the mask are realized thanks to a metal frame rectangular usually very rigid on which the mask is conventionally welded.
  • the frame / mask assembly is mounted in the face before the tube thanks to suspension means most often welded on the frame and cooperating with pins inserted in the glass constituting the face before the tube.
  • the tubes whose front face is becoming flatter correspond to the current trend, with a move towards completely flat front faces.
  • the color selection mask consisting of a metal sheet very small thickness, its setting in tension can generate phenomena parasite vibration of said mask during operation of the tube. Under the influence of shock or external mechanical vibrations, for example acoustic vibrations due to the speakers of the television set in which the tube is inserted, the mask can vibrate according to its own frequency of resonance.
  • the vibrations of the mask have the effect of modifying the landing zone of the electron beams on the tube screen, the dots the impact of each beam being then offset with respect to the associated phosphor, thus creating a discoloration of the image reproduced on the screen.
  • Masks having an effective planar surface particularly in the case where the mask is held in tension by the frame, present a great sensitivity to the vibrations of their environment requiring the use of damping means to prevent the mask from coming into vibration.
  • US4827179 proposes to add on one side of the mask means damping the vibration of the mask.
  • the devices of depreciation implemented in this patent have a complicated structure, difficult to implement.
  • a cathode ray tube 1 comprises a substantially flat slab 2 and a peripheral skirt 3.
  • the slab is connected to the rear part of the tube, in the form of a funnel 4, thanks to a sintered glass sealing.
  • the end portion of the tube 5 surrounds the barrel at electrons 6 whose beams come to illuminate the phosphor screen luminescent 13 through the color selection mask 8, which is here plane, for example stretched between the long sides 9 of the frame 19.
  • Supports metal frames of the frame / mask assembly maintain this set the inside of the tube, said supports possibly comprising a portion 10 welded to the frame and a spring portion 11, provided with an opening for cooperating with a peg 12 included in the glass skirt 3.
  • the frame 19 comprises a pair of long sides 9 and a pair of short sides 7, said long and short sides having for example an L section.
  • the mask 8 itself of substantially rectangular shape, is put in tension and then maintained in this state for example by welding on the end 20 of said long sides of the frame.
  • the mask consists of a metal sheet, for example steel or Invar, very thin, of the order of 100 .mu.m.
  • the mask has a central zone 30 pierced with openings generally arranged in columns and a peripheral area 28 surrounding the central area with edges horizontal 31 and vertical 32.
  • Cathode ray tube structures using selection masks colors put in tension have to deal with the problem of vibration of this mask, following modes that are specific to it, when said mask is excited by external vibrations, for example mechanical shocks on the tube or sound vibrations coming from speakers arranged nearby of the tube.
  • vibrations are manifested by movements of the following mask a direction perpendicular to its surface, the distance between the openings of the mask and the screen varies locally depending on the amplitude of the vibration said mask.
  • the purity of the colors reproduced on the screen is then no longer guarantee, the landing point of the beams on the screen being shifted in depending on the amplitude of the vibration.
  • the vibrations of the mask are amortized only very slowly, the energy communicated to the mask having little means of dissipation, which increases the visibility of the phenomenon on the screen when the tube is in operation.
  • the invention proposes a simple, economical structure, and easy to implement. to dampen the vibrations of a mask stretched in one or two directions.
  • FIG. 5 is a perspective view of a first embodiment of FIG. the invention, adapted to a mask stretched in a single direction, for example parallel to its short sides 32.
  • a damping device 55 in the form of band, for example metal, comprising a central portion 51 secured to on the surface of the edge of the mask, for example by welding, and two wings 50 extending from both sides of this central part.
  • the device cushioning 55 can thus be produced in one piece by cutting a metal strip and stamping or two identical pieces connected between them at the central part 51.
  • the damping device 55 will form with the mask a system of coupled oscillators; the parameters of the damping device 55 as the length of the wings 50, their thickness and their weight are chosen in a conventional way so that the the natural frequency of vibration of the device 55 is close to a chosen value, for example the natural resonant frequency of the mask so that the vibrations of the damping device 55 come to evade the mask vibrations.
  • the frame / mask device When the frame / mask device is such that the mask has a part openwork 30 with openings in columns interconnected by bridges that the tension exerted on the mask is axial, following example the direction of the short sides 32, the long sides being welded on the edges 20 of the long sides 9 of the frame, the behavior of the mask in vibration is in accordance with Figure 4; the vibration amplitude of the mask is maximum at middle level of short sides 32.
  • a damper according to the invention in the middle of each of the two short sides of the mask.
  • the invention provides a structure for simply implementing means of dissipating the energy imparted to the mask during shock of tube or through powerful sound waves. Indeed, we must avoid that the vibrations communicated to the mask, even if they are low amplitude, do not last too long because they then become visible during the operation of the tube. As the mask is found inside the tube in a very high vacuum, it is necessary to add dissipation means energy for the mask to amortize quickly. It is for example advantageous that a portion 52 of the wing 50 come into contact with the mask when it tends to vibrate. The vibration energy is then dissipated by friction between the parts 52 of the damper wing and the mask surface, as shown by Figure 6 illustrating a side view of the frame / mask according to the invention.
  • the wing shape of the device 55 provides the maximum dissipation of friction energy by arranging the parts 52 so as to come into contact of the mask near areas of low vibration amplitude, for example at level of the ends of the wings 50; the central part of the damper 55 being disposed in the zone of maximum vibration amplitude of the mask, the part 52 of the wing will then rub on the mask over an area of considerable length, proportional to the height 53 of the wing measured with respect to the plane of the mask.
  • FIG. 8 shows, in a perspective view, the detail of the end of the wing 50 according to another embodiment; this end 52 comes sandwicher the edge 32 of the mask so as to increase the friction surface between said end 52 and the surface of the mask to dissipate faster the vibration energy of the mask.
  • the mask 8 it is possible as illustrated by the perspective view of FIG. 7, of adding to the wing of a shock absorber 55, at least one metal collar 60 passing through an orifice 61 formed in said wing.
  • the collar can be opened or closed, its section being slightly lower to the diameter of the orifice 61 so as to be able to move in this orifice and dissipate the energy by friction on the edge of said hole.
  • rivets are arranged so as to cross the wings 50 through orifices 61 made thereon, the heads of the rivets having a dimension greater than that of the orifices then that the rivet body has a section smaller than the diameter of said orifice.
  • the arrangement of the coupled oscillators 55 along the short sides 32 of the mask is not limiting.
  • the vibration dampers according to the invention both along the horizontal and vertical edges of said mask.
  • the damping oscillators according to the invention can indifferently be arranged on the surface of the mask facing the screen of phosphors or conversely on the surface of the mask on the electron gun side. he can also be advantageous to have the dampers 55 on both faces of the mask to obtain the desired damping effect.
  • Means for positioning the coupled oscillator 55 on the surface of the mask can be added without complex modification of the structure of the oscillator or mask itself. These means are intended to facilitate the positioning of the coupled oscillator on the edge of the mask during the process of manufacturing the tube. As illustrated in FIG. 7, these means of positioning can be constituted by a tab 65 integral with the oscillator 55 cooperating with a notch 66 located on the edge of the mask 8. Alternatively, the tongue may be integral with the mask and the notch located on the central portion 51 of the oscillator 55.
  • the positioning means may be constituted by a boss intended to fit into an opening adapted; the boss can indifferently be arranged on the mask and it then cooperates with an opening disposed on the central portion 51 of the oscillator, or the boss is disposed on the surface of the oscillator 55, for example on its central part 51 and it then cooperates with an opening arranged on the edge of the mask 8.
  • FIG. 9 illustrates an embodiment of the invention avoiding the appearance of this problem.
  • Guiding means 68 are arranged at level of the free portion 50 of the flexible metal strip constituting the vibration damper 55 near the edge 62 of the mask 8. These means have here the shape of a tongue, forming with the surface of the mask a non-zero angle, preferably of the order of 90 °, so as to extend to the side of the mask on which is the vibration damper 55.
  • This tongue 68 has a height sufficient to prevent the free part 50 from going over and coming block on the edge 62.
  • the tabs 68 can form with the mask a unitary piece being made at the time of cutting the mask and folded thereafter, or they may be additional pieces, solidarisés to the mask later, for example by welding.
  • FIG. 10 illustrates another embodiment of the invention in which the guide means 70 comprises a tongue 70 secured to the frame 19, for example by welding in 71.
  • This tongue is also disposed at the free portion 50 of the damper 55 and extends towards the edge 62 of the mask with a height of the side of the mask, where is damper 50, sufficient to prevent the free portion 50 can not to pass on the other side of the mask when it vibrates.
  • FIG. 11 illustrates an embodiment of the invention in which the guide means are in the form of a tongue 80, one end of which is secured to the frame 81.
  • the other end 82 surrounds, at least partially the free portion 50 of the damper 55, thereby providing guiding improved, avoiding in particular that the free part 55 does not come to rub against the open area 30 of the mask.
  • the invention has the additional advantage of offering means additional energy dissipation allowing the mask to amortize more quickly. Indeed, it is advantageous that part of the wing 50 come to contact guiding means when the mask and the dampers 55 tend to vibrate. The vibration energy is then dissipated by friction between parties in contact. Metal collars 60 can come advantageously complete the energy dissipation by friction.
  • the damping oscillators 55 can indifferently be arranged on the surface of the mask facing the phosphor screen or inversely on the surface of the mask on the electron gun side. He can be also advantageous to have the dampers 55 on both sides of the mask to obtain the desired damping effect.

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  • Electrodes For Cathode-Ray Tubes (AREA)

Claims (16)

  1. Farbkathodenstrahlröhre (1) mit:
    einer Farbauswahlmaske (8) in der Form einer im wesentlichen rechteckförmigen, metallischen Folie zur Befestigung unter Spannung auf einem Stützrahmen (19) und montiert im Inneren der Vorderseite der Röhre, wobei die Maske einen mit Öffnungen versehenen mittleren Bereich (30) und einen peripheren Bereich (28) zwischen dem mittleren Bereich und den Kanten (62) der Maske versehen ist und die Maske in der Lage ist, unabhängig von dem Stützrahmen zu schwingen,
    Mitteln zur Dämpfung der Maskenschwingungen an der Peripherie der Maske, um die Schwingungen in der Maske zu dämpfen,
    wobei die Dämpfungsmittel dadurch gekennzeichnet sind, dass sie einen Resonator (55) in der Form eines flexiblen Bands enthalten, von dem ein mittlerer Teil (51) auf einer Oberfläche des peripheren Bereichs (28) der Maske befestigt ist, mit zwei Flügeln (50), die sich auf beiden Seiten des mittleren Teils erstrecken.
  2. Kathodenstrahlröhre nach Anspruch 1, dadurch gekennzeichnet, dass die Maske in einer Richtung gespannt ist und dass der Resonator auf dem peripheren Bereich der Maske befestigt ist, und dass die Flügel des Resonators sich in einer Richtung parallel zu der Richtung der Spannung der letzteren erstrecken.
  3. Kathodenstrahlröhre nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Resonator außerdem Mittel (60, 61) zur Ableitung der Schwingungsenergie enthält.
  4. Kathodenstrahlröhre nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass ein Teil (52) der Flügel des Resonators in Berührung gelangt mit der Oberfläche der Maske, wenigstens dann, wenn die Maske wieder zu Schwingen beginnt.
  5. Kathodenstrahlröhre nach Anspruch 4, dadurch gekennzeichnet, dass der Teil der Flügel, der in Berührung kommt mit der Oberfläche der Maske, sich zu beiden Seiten des peripheren Bereichs der Maske erstreckt in einer solchen Weise, dass er diese einschließt.
  6. Kathodenstrahlröhre nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, dass die Mittel zur Ableitung der Energie wenigstens einen Ring (60) enthalten, der sich über die Dicke eines Flügels des Resonators erstreckt.
  7. Kathodenstrahlröhre nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass ein Resonator und die Maske zusätzliche Positioniermittel enthalten um die Positionierung des Resonators auf einer Oberfläche der Maske sicherzustellen.
  8. Kathodenstrahlröhre nach Anspruch 7, dadurch gekennzeichnet, dass die Mittel zur Positionierung mit der Öffnung zusammenarbeitenden runden Vorsprung enthalten.
  9. Kathodenstrahlröhre nach Anspruch 7, dadurch gekennzeichnet, dass die Mittel zur Positionierung eine Zunge (65) enthalten, die mit einer Kerbe (66) zusammenarbeitet.
  10. Farbkathodenstrahlröhre (1) nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass sie außerdem Führungsmittel (68, 70, 80) für die Bewegungen des freien Teils (50) des metallischen flexiblen Bands enthält, um den freien Teil auf derselben Seite der Maske zu halten.
  11. Kathodenstrahlröhre nach Anspruch 10, dadurch gekennzeichnet, dass die Führungsmittel (68) aus einem Stück mit der Maske bestehen.
  12. Kathodenstrahlröhre nach Anspruch 11, dadurch gekennzeichnet, dass die Führungsmittel wenigstens eine Zunge (68) enthalten, die sich von der Oberfläche der Maske bei dem freien Ende des Bandes (55) erstreckt.
  13. Kathodenstrahlröhre nach Anspruch 12, dadurch gekennzeichnet, dass die Zunge (68) im wesentlichen senkrecht zu der Oberfläche der Maske liegt.
  14. Kathodenstrahlröhre nach Anspruch 10, dadurch gekennzeichnet, dass die Führungsmittel (70, 80) mit dem Rahmen aus einem Stück bestehen.
  15. Kathodenstrahlröhre nach Anspruch 14, dadurch gekennzeichnet, dass die Führungsmittel wenigstens eine Zunge (70, 80) enthalten von der ein Ende einstückig mit dem Rahmen ausgebildet ist und diese Zunge sich von dem Rahmen über den Rand (62) der Maske bei dem freien Teil des flexiblen Bands (55) erstreckt.
  16. Kathodenstrahlröhre nach Anspruch 15, dadurch gekennzeichnet, dass das freie Ende (82) der Zunge (80) wenigstens teilweise den freien Teil des flexiblen Bands (55) umgibt.
EP20000403034 1999-11-05 2000-10-31 Maskentragrahmen-Struktur für Kathodenstrahlröhre Expired - Lifetime EP1098349B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
IT1999MI002324A IT1313924B1 (it) 1999-11-05 1999-11-05 Struttura di telaio/maschera perfezionata per tubo a raggi catodici.
ITMI992324 1999-11-05
ITMI201480 2000-06-30
IT2000MI001480A IT1318092B1 (it) 2000-06-30 2000-06-30 Tubo a raggi catodici con struttura di telaio/maschera perfezionata

Publications (2)

Publication Number Publication Date
EP1098349A1 EP1098349A1 (de) 2001-05-09
EP1098349B1 true EP1098349B1 (de) 2005-04-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20000403034 Expired - Lifetime EP1098349B1 (de) 1999-11-05 2000-10-31 Maskentragrahmen-Struktur für Kathodenstrahlröhre

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EP (1) EP1098349B1 (de)
DE (1) DE60019702T2 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW503427B (en) * 2000-07-25 2002-09-21 Koninkl Philips Electronics Nv Display tube comprising a mask with vibration damping means
IT1319319B1 (it) 2000-11-07 2003-10-10 Videocolor Spa Tubo a raggi catodici a colori e piu' in particolare una struttura dimaschera adattata per essere mantenuta in tensione all'interno del
US6520475B2 (en) * 2001-02-01 2003-02-18 Thomson Licensing S. A. Split foot damper
ITMI20011874A1 (it) 2001-09-07 2003-03-07 Videocolor Spa Sistema ammortizzatore per complesso maschera/telaio in tensione
US6700319B2 (en) * 2001-11-29 2004-03-02 Thomson Licensing S. A. Cathode-ray tube having a tension mask with microphonics control
US6710531B2 (en) * 2001-12-21 2004-03-23 Thomson Licensing S.A. CRT having a shadow mask vibration damper
ITMI20030527A1 (it) * 2003-03-19 2004-09-20 Videocolor Spa Dispositivo di mascheratura per tubo a raggi catodici

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4318025A (en) * 1979-11-21 1982-03-02 North American Philips Consumer Electronics Corp. Shadow mask microphonic suppressor
US4827179A (en) * 1987-06-09 1989-05-02 Zenith Electronics Corporation Mask vibration damping in cathode ray tubes
US5394051A (en) * 1992-12-28 1995-02-28 Zenith Electronics Corporation Vibration-damping configuration in a strip shadow mask
US5391957A (en) * 1992-12-28 1995-02-21 Zenith Electronics Corporation Vibration damping means for a strip shadow mask
JP3189765B2 (ja) * 1997-10-20 2001-07-16 ソニー株式会社 カラー陰極線管及びアパーチャグリル

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Publication number Publication date
DE60019702D1 (de) 2005-06-02
EP1098349A1 (de) 2001-05-09
DE60019702T2 (de) 2006-04-27

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