EP0500312A1 - Assemblage de masque d'ombre pour tube à rayons cathodiques en coleurs - Google Patents

Assemblage de masque d'ombre pour tube à rayons cathodiques en coleurs Download PDF

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Publication number
EP0500312A1
EP0500312A1 EP92301308A EP92301308A EP0500312A1 EP 0500312 A1 EP0500312 A1 EP 0500312A1 EP 92301308 A EP92301308 A EP 92301308A EP 92301308 A EP92301308 A EP 92301308A EP 0500312 A1 EP0500312 A1 EP 0500312A1
Authority
EP
European Patent Office
Prior art keywords
shadow mask
expansion metal
frame
glass panel
assembly
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Withdrawn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
EP92301308A
Other languages
German (de)
English (en)
Inventor
Takeshi c/o NEC Corporation Sasaki
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.)
NEC Corp
Original Assignee
NEC 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 NEC Corp filed Critical NEC Corp
Publication of EP0500312A1 publication Critical patent/EP0500312A1/fr
Withdrawn legal-status Critical Current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
    • 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

Definitions

  • the present invention relates to a shadow mask assembly for a color cathode ray tube, and more particularly to a shadow mask assembly having a bimetallic spring member for supporting a frame to a glass panel of a color cathode ray tube.
  • a conventional shadow mask assembly for a color cathode ray tube of the kind to which the present invention relates employs a mask assembly in which there are disposed a large number of small apertures for having corresponding electron beams selectively excite screen elements of the three primary color light emitting phosphors deposited on an inner surface of a glass panel of the cathode ray tube.
  • the shadow mask assembly includes a shadow mask, a frame and a plurality of bimetallic spring members.
  • the shadow mask contains a large number of small apertures associated with groups of screen elements of red (R), green (G), and blue (B) light-emitting phosphors.
  • the frame is fixed to the shadow mask by means such as welding and provides structural strength to the shadow mask.
  • Each of the bimetallic spring members supports the frame against a phosphor deposited glass panel with a predetermined space provided therebetween and has a function of self-adjustment for the thermal expansiion of the shadow mask thereby adjusting a distance between the inner surface of the glass panel and a curved surface of the shadow mask. This enables to make an appropriate correction of a relative location between the screen elements of phosphors and the electron beams to strike such screen elements.
  • a bimetallic spring member has a high expansion metal 1 which extends over the entire length of a low expansion metal 2. Since the correction working effective length is determined by a point at which the bimetallic spring member and the frame are welded together, the correction working effective length and the spring working effective length naturally result in the identical working effective length. Which is denoted by L w in Fig. 1.
  • an object of the present invention to overcome the problems existing in the conventional shadow mask assembly and to provide an improved assembly, particularly an improved bimetallic spring assembly for use in the assembly.
  • One of the main objects is to provide such a shadow mask assembly in which the occurrence of misalignmetn between electron beams and phosphor elements can be avoided and the accuracy in the given working parameters can be ensured.
  • a shadow mask assembly for a color cathode ray tube having a glass panel, said assembly having a shadow mask which is disposed behind an inner surface of the glass panel with a predetermined space being provided with respect to said inner surface;
  • the invention provides a shadow mask assembly for a color cathode ray tube having a glass panel, said assembly having:
  • the effective length of the low expansion metal of the bimetallic member is less than that of the high expansion metal, and is equal to the effective correction length (L c ).
  • a bimetallic spring member 7 has a high expansion metal 1 and a low expansion metal 2 bonded together.
  • a plurality of bimetallic spring members 7 are welded to a frame 6 to which a shadow mask 5 is welded.
  • Each of the bimetallic spring members 7 has a hole 7 that receives a tapered stud 8 (see Fig. 4) projecting from a sidewall of the glass panel.
  • L c the correction working effective length
  • the spring working effective length L s is the region which extends between the hole 4 and the point 3 at which the bimetallic spring member 7 is welded to the frame 6. This region functions as a spring for the bimetallic spring member 7 to support the overall structure of the shadow mask assembly and, in substance, it is the high expansion metal 1 that plays the role of such a spring.
  • the correction working effective length L c and the spring working effective length L s are functionally independent from each other.
  • the effective length of the low expansion metal 2 of the bimetallic spring member and the correction working effective length thereof are made the same length with respect to each other and such length is made shorter than the spring working effective length L S . In this way, the correction working is not influenced by location of the welding points which are otherwise required to be disposed at precise locations.
  • the precondition is that the low expansion metal extends through only the correction working effective length region and such region is limited within the spring working effective length region, so that the correction working effective length which requires high precision dimensions is determined by a high precision process such as a press and only the spring working effective length the characteristics of which are comparatively little influenced by any precision in dimensions is determined by location of the welding point.
  • the invention enables to achieve the optimum correction working and enchances a high reliability of given working parameters.

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  • Electrodes For Cathode-Ray Tubes (AREA)
EP92301308A 1991-02-18 1992-02-18 Assemblage de masque d'ombre pour tube à rayons cathodiques en coleurs Withdrawn EP0500312A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP22501/91 1991-02-18
JP3022501A JPH04262342A (ja) 1991-02-18 1991-02-18 カラーブラウン管用シャドウマスク構体

Publications (1)

Publication Number Publication Date
EP0500312A1 true EP0500312A1 (fr) 1992-08-26

Family

ID=12084495

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92301308A Withdrawn EP0500312A1 (fr) 1991-02-18 1992-02-18 Assemblage de masque d'ombre pour tube à rayons cathodiques en coleurs

Country Status (3)

Country Link
EP (1) EP0500312A1 (fr)
JP (1) JPH04262342A (fr)
KR (1) KR920017159A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1001446A1 (fr) * 1998-03-31 2000-05-17 Kabushiki Kaisha Toshiba Ecran cathodique couleur, support elastique de cet ecran et mecanisme de support elastique
US6885139B2 (en) * 2001-07-02 2005-04-26 Samsung Sdi Co., Ltd. Color selection apparatus for color cathode ray tube

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100329592B1 (ko) * 2000-09-26 2002-03-21 김두희 칼라브라운관용 바이메탈 스프링 소재
KR100618311B1 (ko) * 2005-09-26 2006-09-01 엔바로테크 주식회사 알루미늄킬드강 섀도우마스크용 트리메탈스프링소재

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4491763A (en) * 1982-08-31 1985-01-01 Tokyo Shibaura Denki Kabushiki Kaisha Color picture tube with shadow mask supporting members
JPS62268040A (ja) * 1986-05-14 1987-11-20 Matsushita Electronics Corp カラ−受像管
US4792719A (en) * 1987-08-31 1988-12-20 Gte Products Corporation Edge-bonded bimetal compensator for shadow mask

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4491763A (en) * 1982-08-31 1985-01-01 Tokyo Shibaura Denki Kabushiki Kaisha Color picture tube with shadow mask supporting members
JPS62268040A (ja) * 1986-05-14 1987-11-20 Matsushita Electronics Corp カラ−受像管
US4792719A (en) * 1987-08-31 1988-12-20 Gte Products Corporation Edge-bonded bimetal compensator for shadow mask

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1001446A1 (fr) * 1998-03-31 2000-05-17 Kabushiki Kaisha Toshiba Ecran cathodique couleur, support elastique de cet ecran et mecanisme de support elastique
EP1001446A4 (fr) * 1998-03-31 2000-06-28 Toshiba Kk Ecran cathodique couleur, support elastique de cet ecran et mecanisme de support elastique
US6452318B1 (en) 1998-03-31 2002-09-17 Kabushiki Kaisha Toshiba Elastic support member for color CRT
US6885139B2 (en) * 2001-07-02 2005-04-26 Samsung Sdi Co., Ltd. Color selection apparatus for color cathode ray tube

Also Published As

Publication number Publication date
JPH04262342A (ja) 1992-09-17
KR920017159A (ko) 1992-09-26

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19920311

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Effective date: 19930607