EP0818800B1 - Farbkathodenstrahlröhre - Google Patents

Farbkathodenstrahlröhre Download PDF

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Publication number
EP0818800B1
EP0818800B1 EP97111545A EP97111545A EP0818800B1 EP 0818800 B1 EP0818800 B1 EP 0818800B1 EP 97111545 A EP97111545 A EP 97111545A EP 97111545 A EP97111545 A EP 97111545A EP 0818800 B1 EP0818800 B1 EP 0818800B1
Authority
EP
European Patent Office
Prior art keywords
connecting portion
mask body
mask
side wall
central
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
EP97111545A
Other languages
English (en)
French (fr)
Other versions
EP0818800A1 (de
Inventor
Norio Shimizu
Shinichiro Nakagawa
Masatsugu Inoue
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
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 Toshiba Corp filed Critical Toshiba Corp
Publication of EP0818800A1 publication Critical patent/EP0818800A1/de
Application granted granted Critical
Publication of EP0818800B1 publication Critical patent/EP0818800B1/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
    • H01J29/073—Mounting arrangements associated with shadow masks
    • 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

Definitions

  • the present invention relates to a shadow mask type color cathode ray tube.
  • a color cathode ray tube comprises an envelope including a substantially rectangular panel in which a skirt portion is provided on a periphery of an effective portion thereof, and a funnel connected to the skirt portion.
  • a phosphor screen comprising three-color phosphor layers.
  • a shadow mask is disposed inside of the phosphor screen so as to oppose it.
  • An electron gun for emitting three electron beams is disposed in a neck of the funnel. Then, the three electron beams emitted from the electron gun are deflected by a magnetic field generated from a deflection apparatus provided outside of the funnel, and vertically and horizontally scan the phosphor screen through the shadow mask, thereby displaying color image on the phosphor screen.
  • the shadow mask is used for selecting three electron beams and comprises a substantially rectangular mask body in which a number of electron beam passage apertures are formed on a region opposing the phosphor screen and a substantially rectangular mask frame having side walls fixed to the periphery of the mask body.
  • substantially wedge shaped elastic supports are provided at corners of the mask frame and these elastic supports are engaged with stud pins provided at the skirt portion of the panel, so that the shadow mask is detachably supported thereby.
  • a color cathode ray tube in which the size of three color phosphor layers and their arrangement pitch are reduced to increase its resolution.
  • allowance to deviation of beam landing relative to the three color phosphor layers has dropped so that more accurate beam landing than ordinary color cathode ray tubes is demanded.
  • the shadow mask is so constructed that almost entire periphery of the mask body is in contact with the side walls of the mask frame.
  • the shadow mask may be deviated from its proper position because a undesired force is applied to the mask body due to disparity in quality of the mask frame resulting from production.
  • the side wall on the long side of the mask frame is much longer than the side wall on the short side as compared to ordinary color cathode ray tubes.
  • the mask body is likely to be deformed because of insufficient strength and a disparity in distance between the opposing side walls on the long side (distance in the direction of the short axis).
  • a color cathode ray tube employing a low thermal expansion type shadow mask which is made of amber material having a high effect of suppressing a transition of electron beams due to so-called doming that the shadow mask is expanded in a direction of the phosphor screen due to thermal expansion of the shadow mask.
  • Jpn. Pat. Appln. KOKAI No. 5-121009 has disclosed a shadow mask in which a plurality of protruding portions which protrude outwardly are provided on side walls of the mask frame.
  • design of the mask frame is important in order to display picture images having no deviation in color on the phosphor screen.
  • conventional shadow masks have such a problem that the mask body or mask frame is deformed and it is difficult to display high quality images.
  • a color cathode ray tube according to the precharacterizing part of claim 1 is disclosed in EP-A-0 004 245.
  • the present invention has been contrived in consideration of the above circumstances and its object is to provide a color cathode ray tube which is capable of suppressing effectively a deformation of the mask body or the mask frame and displaying high quality images.
  • a color cathode ray tube comprising: an envelope including a panel having a substantially rectangular effective portion in which a phosphor screen is formed on an inner surface thereof, a skirt portion provided on a periphery of the panel, and a funnel fixed to the skirt portion; a shadow mask arranged in the envelope so as to oppose the phosphor screen; and an elastic support elastically supporting the shadow mask relative to the skirt portion.
  • the shadow mask comprises a substantially rectangular mask body in which a number of electron beam passage apertures are formed, and a substantially rectangular mask frame having four side walls supporting the periphery of the mask body. At least two side walls opposing each other include connecting portions which are provided at their central portions in a lengthwise direction and connected to the mask body, and a pair of protruding portions which are provided on both sides of the connecting portion and protrude in a direction apart from the mask body. Each of the protruding portions defines a gap between the side wall and the mask body and the gap includes that portion whose width gradually increases as it goes far from the connecting portion.
  • a contact area therebetween is reduced so that influence upon the mask body of the disparity in size of the mask frame or deformation of the mask frame can be reduced.
  • the color cathode ray tube comprises a vacuum envelope 10 formed of glass.
  • the vacuum envelope 10 comprises a panel 3 including a substantially rectangular effective portion 1 and a skirt portion 2 provided on the periphery of the effective portion, and a funnel 4 attached to the skirt portion 2.
  • a phosphor screen 5 including stripe shaped three color phosphor layers 20B, 20G, 20R emitting blue, green and red colors, and stripe shaped light shielding layer 23 formed between the phosphor layers.
  • a shadow mask 21 which will be described later is disposed in the envelope 10 to oppose the phosphor screen 5.
  • An electron gun 9 for emitting three electron beams 8 is disposed within a neck 7 of the funnel 4.
  • the three electron beams 8 emitted from the electron gun 9 are deflected by a magnetic field generated from a deflection apparatus 11 provided outside of the funnel 4, and horizontally and vertically scan the phosphor screen 5 through the shadow mask 21, thereby displaying color images on the phosphor screen.
  • the shadow mask 21 comprises a substantially rectangular mask body 27 and a mask frame 30 supporting the mask body 27.
  • the mask body 27 includes a substantially rectangular effective portion 27a which is opposed to the phosphor screen 5 and has a number of electron beam passage apertures 25, and a skirt portion 26 formed on the periphery of the effective portion 27a.
  • the mask frame 30 is formed in a substantially rectangular and has a pair of side walls 28L on its long side and a pair of side walls 28S on its short side. The mask body 27 is supported by welding the skirt portion 26 thereof to the mask frame 30.
  • the pair of the side walls 28L on the long side are fixed to the mask body 27 while only a central portion thereof in the lengthwise direction and its both ends in the lengthwise direction are in contact with the skirt portion 26 of the mask body 27, and each side wall 28L has those portions which are not in contact with the skirt portion 26 of the mask body 27.
  • the respective side walls 28L are bent symmetrically with respect to a short axis V of the mask frame 30 such that a central connecting portion 32a and a pair of end connecting portions 32b which are in contact with the skirt portion 26 of the mask body 27 are formed in the center portion in the lengthwise direction and both ends in the lengthwise direction.
  • a central connecting portion 32a and a pair of end connecting portions 32b which are in contact with the skirt portion 26 of the mask body 27 are formed in the center portion in the lengthwise direction and both ends in the lengthwise direction.
  • On both sides of the central connecting portion 32a are wedge-shaped protruding portions 34 which protrude in a direction to be apart from the mask body 27.
  • a distance d between the pair of the side walls 28L at the positions of the protruding portions 34 is larger than a distance dv between the side walls 28L on the short axis V and a distance ds between the side walls 28L in the vicinity of the side walls 28S on the short side.
  • Each long side portion of the skirt portion 26 of the mask body 27 is located inside the mask frame 30 and is in contact with the central connecting portion 32a and the end connecting portions 32b of the corresponding side walls 28L and welded to the central connecting portion 32a and the end connecting portions 32b.
  • a pair of gaps 36 are defined between each of the side walls 28L and the mask body 27 by the protruding portions 34 and located on both sides of the central connecting portions 32a.
  • the respective gaps 36 are formed in a wedge shape whose width gradually expands from the central connecting portion 32a toward the end connecting portion 32b.
  • the skirt portion 26 on the short side of the mask body 27 is in contact with the inside of the entire length of the side wall 28S on the short side of the frame 30 and welded to the side wall 28S at several appropriate points.
  • the shadow mask 21 having the above structure is detachably supported by the panel 3 by engaging wedge shaped elastic supports 15 fixed to corner portions of the mask frame 30 with stud pins 16 protruding from the skirt portion 2 of the panel 3, respectively.
  • reference numeral 22 denotes an internal magnetic field shielding body attached to the shadow mask 21.
  • the mechanical strength of the mask frame 30 is improved.
  • the side walls on the long side of the mask frame is much longer than ordinary cathode ray tubes, and therefore the mask body is likely to be deformed due to a shortage of strength and disparity of the distance between opposing side walls on the long side.
  • the shadow mask 21 in the structure described above, it is possible to effectively prevent the shadow mask from being deformed.
  • the gap 36 is defined between the mask body 27 and the side wall 28L by forming the protruding portions 34 on the side walls 28L of the mask frame 30.
  • each side wall 28L is in contact with the mask body 27 only through the central connecting portion 32a and the end connecting portions 32b so that a contacting area between the mask frame 30 and the mask body 27 can be reduced largely as compared to conventional examples.
  • the mask frame 30 is reinforced.
  • the weight of the mask frame may be reduced so that burden on the elastic supports can be reduced. Further, even if the thickness of the mask body 27 is reduced, the deformation thereof can be prevented.
  • each side wall 28L of the mask frame 30 has the wedge-shaped protruding portions 34 and the gaps 36 defined by these protruding portions 34. If the side wall 28L is so structured as to be in contact with the mask body 27 through only the central portion and both ends portions in the lengthwise directions, the shapes of the protruding portions 34 and the gaps 36 may be changed in various ways as required.
  • the respective protruding portions 34 are formed in substantially rectangular shape and each gap 36 is formed such that only end portion 36a on the central connecting portion 32a side gradually expand in terms of width from the central connecting portion 32a toward the end connecting portion 32b and the remaining parts are formed with a constant width.
  • FIGS. 6A and 6B show a shadow mask 21 in the color cathode ray tube according to a second embodiment of the present invention.
  • a pair of protruding portions 40 are formed on the side walls 28S on the short side as well as the side walls 28L on the long side.
  • Each of the side walls 28S is also connected to the mask body 27 such that only its central portion 42a and both end portions 42b in the lengthwise direction are in contact with the skirt portion 26 of the mask body 27 and has some portions which are not in contact with the skirt portion 26 of the mask body 27.
  • each side wall 28S is bent symmetrically with respect to a long axis H of the mask frame 30 such that a central connecting portion 42a and a pair of end connecting portions 42b which are in contact with the skirt portion 26 of the mask body 27 are formed in the center portion in the lengthwise direction and both ends in the lengthwise direction.
  • wedge-shaped protruding portions 40 which protrude in a direction to be apart from the mask body 27 are formed on both sides of the central connecting portions 42a.
  • a distance at the protruding portions 40 between the pair of the side walls 28S is larger than a distance on the long axis H between the side walls 28S and further a distance in the vicinity of the long side between the side walls 28S.
  • the skirt portion 26 of the mask body 27 is located within the mask frame 30 such that each short side portion thereof is in contact with the central connecting portion 42a and end connecting portions 42b of the corresponding side wall 28s and welded to the central connecting portions 42a and the end connecting portions 42b.
  • a pair of gaps 44 are defined between the side wall 28s and the mask body 27 by the protruding portions 40 and located on both sides of the central connecting portion 42a.
  • Each gap 44 is formed in wedge shape expanding gradually from the central connecting portion 42a toward the end connecting portions 42b.
  • the protruding portions 40 are also provided on the side walls 28s on the short side, so that the mechanical strength of the mask frame 30 is further improved and a contact area between the mask body 27 and the mask frame 30 is further reduced.
  • deformation of the mask body 27 can be further reduced thereby preventing effectively a deviation of the shadow mask 21 with respect to the panel 3.
  • FIGS. 7A and 7B show the shadow mask 21 of the color cathode ray tube according to a third embodiment of the present invention.
  • four protruding portions 34 are formed on each of the side walls 28L, 28S of the mask frame 30. That is, two protruding portions 34 are formed each on one side symmetrically with respect to the short axis V on each of the side walls 28L.
  • Each side walls 28L has middle connecting portions 32c located between the connecting portions 32a and 32b in addition to the central connecting portion 32a and the end connecting portions 32b, and the side wall 28L is welded to the skirt portion 26 of the mask body 27 through these five connecting portions.
  • Between the side wall 28L and the skirt portion 26 are defined four gaps 36 by the protruding portions 34 such that each of the gaps 36 is formed in wedge shape gradually expanding from the central connecting portion 32a toward the end connecting portions 32b.
  • each side wall 28S has middle connecting portions 42c located between the connecting portions 42a and 42b in addition to the central and end connecting portions 42a and 42b, and each side wall 28S is welded to the skirt portion 26 of the mask body 27 through these five connecting portions. Between the side wall 28S and the skirt portion 26 are defined four gaps 36 by the protruding portions 40 such that each of the gaps is formed in wedge shape gradually expanding from the central connecting portion 42a toward the end connecting portions 42b.
  • the mask frame 30 is reinforced by forming the protruding portions 34, 40, so that for example if an external shock is applied to the shadow mask 21, that shock can be dispersed depending on the number of the protruding portions.
  • the same operation and effect as in the first and second embodiments can be obtained.
  • FIGS. 8A and 8B show the shadow mask of the color cathode ray tube according to a fourth embodiment of the present invention.
  • one protruding portion 34 is formed on each side wall 28L on the long side of the mask frame 30, symmetrically with respect to the short axis V.
  • Each of the protruding portions 34 is formed in a constant width along the entire length in its lengthwise direction.
  • a distance d between the pair of the side walls 28L at the position of the protruding portions 34 is the same as a distance dv between the side walls 28L on the short axis V.
  • An inner surface of the protrude portion 34 is of linear shape having infinite curvature.
  • the long side portion of the mask body 27 is formed in circular shape protruding toward the side wall side of the mask frame 30.
  • the side walls 28L are in contact with the long side of the skirt portion 26 of the mask body 27 through only the central connecting portion 32a located in the center in the lengthwise direction of the protruding portion 34 and a pair of the end connecting portions 32b located on boundaries between the protruding portion and the side wall, and welded to the skirt portion through these connecting portions.
  • On both sides of the central connecting portions 32a are defined wedge shaped gaps 36 the width of which is expanded gradually toward the end connecting portions 32b.
  • the short side of the skirt portion 26 of the mask body 27 is in contact with the almost entire length of the inner surface of the side wall 28S on the short side of the mask frame 30 and fixed at several appropriate welding points.

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  • Electrodes For Cathode-Ray Tubes (AREA)
  • Media Introduction/Drainage Providing Device (AREA)

Claims (6)

  1. Farbkathodenstrahlröhre mit:
    einem Kolben (10), der ein Panel (3) mit einem im wesentlichen rechtwinkligen wirksamen Abschnitt (1) aufweist, in dem ein Leuchtstoffbildschirm (5) auf dessen inneren Oberfläche gebildet ist und ein Randabschnitt (2) auf einem Umfang des Panels vorgesehen ist, und ein Trichter (4) an dem Randabschnitt befestigt ist; wobei eine Lochmaske (21) in dem Kolben angeordnet ist, die dem Leuchtstoffschirm gegenüberliegt; und
    einer elastischen Stütze (15), die die Lochmaske bezüglich des Randabschnitts elastisch stützt;
    wobei die Lochmaske einen im wesentlichen rechtwinkligen Maskenkörper (27) mit einer Anzahl von Elektronenstrahldurchlauföffnungen (25) und einen im wesentlichen rechtwinkligen Maskenrahmen (30) mit vier Seitenwänden, die den Umfang des Maskenkörpers stützen, aufweist;
    wobei jede der mindestens zwei einander gegenüberliegenden Seitenwände (28L) des Maskenrahmens (30) einen Verbindungsabschnitt (32a) aufweist, der am Mittenabschnitt in ihrer longitudinalen Richtung vorgesehen und an dem Maskenkörper (27) befestigt ist, und ein Paar von hervorspringenden Abschnitten (34), die an beiden Seiten des Verbindungsabschnitts bezüglich der longitudinalen Richtung der Seitenwand vorgesehen sind und in einer von dem Maskenkörper hinweggehenden Richtung hervorspringen, und jeder der hervorspringen Abschnitte einen Abstand (36) zwischen der Seitenwand und dem Maskenkörper festlegt,
       dadurch gekennzeichnet, daß jeder Abstand einen Bereich aufweist, dessen Breite allmählich ansteigt, wenn er sich von dem Verbindungsabschnitt weg entfernt.
  2. Farbkathodenstrahlröhre gemäß Anspruch 1,
       dadurch gekennzeichnet, daß jede der mindestens zwei einander gegenüberliegenden Seitenwände (28L) einen zentralen Verbindungsabschnitt (32a) aufweist, der an dem Mittenabschnitt der Seitenwand in deren longitudinalen Richtung angeordnet und an dem Maskenkörper (27) befestigt ist, und ein Paar von Endverbindungsabschnitten (32b), die an beiden Enden der Seitenwand in deren longitudinalen Richtung angeordnet und an dem Maskenkörper befestigt sind;
       wobei jeder der hervorspringenden Abschnitte (34) zwischen dem zentralen Verbindungsabschnitt (32a) und einem entsprechenden Endverbindungsabschnitt (32b) vorgesehen ist, und der durch den hervorspringenden Abschnitt festgelegte Abstand (36) eine Breite aufweist, die sich kontinuierlich von dem zentralen Verbindungsabschnitt bis zu dem Endverbindungsabschnitt erhöht.
  3. Farbkathodenstrahlröhre gemäß Anspruch 1, dadurch gekennzeichnet, daß
    jede der mindestens zwei einander gegenüberliegenden Seitenwände (28L) einen zentralen Verbindungsabschnitt (32a) aufweist, der an einem zentralen Abschnitt der Seitenwand in der longitudinalen Richtung angeordnet und an dem Maskenkörper (27) befestigt ist;
    ein Paar von Endverbindungsabschnitten (32b), die an beiden Enden der Seitenwand in der longitudinalen Richtung angeordnet und an dem Maskenkörper befestigt sind;
    einen mittleren Verbindungsabschnitt (32c), der zwischen dem zentralen Verbindungsabschnitt und jedem Endverbindungsabschnitt angeordnet und an dem Maskenkörper befestigt ist;
    ein Paar von ersten hervorspringenden Abschnitten (34), wobei jeder dieser zwischen dem zentralen Verbindungsabschnitt und dem mittleren Verbindungsabschnitt gebildet ist und in einer von dem Maskenkörper hinweggehenden Richtung hervorspringt; und
    ein Paar von zweiten hervorspringenden Abschnitten (34), wobei jeder dieser zwischen dem mittleren Verbindungsabschnitt und dem Endverbindungsabschnitt gebildet ist und in einer von dem Maskenkörper hinweggehenden Richtung hervorspringt;
    wobei jeder der ersten hervorspringenden Abschnitte einen Abstand (36) festlegt, dessen Breite kontinuierlich von dem zentralen Verbindungsabschnitt bis zu dem mittleren Verbindungsabschnitt ansteigt, und jeder der zweiten herausragenden Abschnitte (36) einen Abstand festlegt, dessen Breite kontinuierlich von dem mittleren Verbindungsabschnitt bis zu dem Endverbindungsabschnitt ansteigt.
  4. Farbkathodenstrahlröhre gemäß Anspruch 1, dadurch gekennzeichnet, daß
    eine Länge des Abstands (36), der zwischen dem zentralen Verbindungsabschnitt (32a) und dem Endverbindungsabschnitt (32b) in der longitudinalen Richtung der Seitenwand (28L) festgelegt ist, auf 0,7-0,9 L eingestellt ist, wenn ein Abstand zwischen dem zentralen Verbindungsabschnitt und der Seitenwand (28S) auf der kurzen Seite als L angenommen wird.
  5. Farbkathodenstrahlröhre gemäß Anspruch 1, dadurch gekennzeichnet, daß
    ein einzelner Verbindungsabschnitt (32a) an jeder der mindestens zwei Seitenwände (28L) vorgesehen und mit dem Maskenkörper (27) nur an dessen zentralen Abschnitt in der longitudinalen Richtung befestigt ist.
  6. Farbkathodenstrahlröhre gemäß Anspruch 1, dadurch gekennzeichnet, daß
    der lange Seitenabschnitt des Maskenkörpers (27) in einer kreisförmigen Form gebildet ist, der zu der Seitenwandseite des Maskenrahmens (30) hin hervorspringt.
EP97111545A 1996-07-12 1997-07-08 Farbkathodenstrahlröhre Expired - Lifetime EP0818800B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP18316096 1996-07-12
JP18316096 1996-07-12
JP183160/96 1996-07-12

Publications (2)

Publication Number Publication Date
EP0818800A1 EP0818800A1 (de) 1998-01-14
EP0818800B1 true EP0818800B1 (de) 2001-12-19

Family

ID=16130854

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97111545A Expired - Lifetime EP0818800B1 (de) 1996-07-12 1997-07-08 Farbkathodenstrahlröhre

Country Status (6)

Country Link
EP (1) EP0818800B1 (de)
KR (1) KR100239244B1 (de)
CN (1) CN1084523C (de)
DE (1) DE69709257T2 (de)
MY (1) MY118882A (de)
TW (1) TW388050B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6806633B2 (en) * 1999-12-27 2004-10-19 Matsushita Electric Industrial Co., Ltd. Cathode ray tube

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2420205A1 (fr) * 1978-03-13 1979-10-12 Videocolor Sa Tube a masque pour la television en couleurs
KR910005085B1 (ko) * 1988-02-03 1991-07-22 미쓰비시덴기 가부시기갸이샤 컬러수상관
JPH05121009A (ja) * 1991-10-25 1993-05-18 Nec Corp カラー受像管

Also Published As

Publication number Publication date
TW388050B (en) 2000-04-21
CN1084523C (zh) 2002-05-08
KR100239244B1 (ko) 2000-01-15
DE69709257D1 (de) 2002-01-31
EP0818800A1 (de) 1998-01-14
DE69709257T2 (de) 2002-08-14
KR980011627A (ko) 1998-04-30
CN1170952A (zh) 1998-01-21
MY118882A (en) 2005-02-28

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