EP0012359A1 - Dispositif porte-getters destiné aux tubes cathodiques - Google Patents

Dispositif porte-getters destiné aux tubes cathodiques Download PDF

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Publication number
EP0012359A1
EP0012359A1 EP79104948A EP79104948A EP0012359A1 EP 0012359 A1 EP0012359 A1 EP 0012359A1 EP 79104948 A EP79104948 A EP 79104948A EP 79104948 A EP79104948 A EP 79104948A EP 0012359 A1 EP0012359 A1 EP 0012359A1
Authority
EP
European Patent Office
Prior art keywords
getter
receptacle
height
getter assembly
side wall
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.)
Granted
Application number
EP79104948A
Other languages
German (de)
English (en)
Other versions
EP0012359B1 (fr
Inventor
Thomas Harry Madden
Clair Wilbur Reash
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.)
SAES Getters SpA
Original Assignee
Union Carbide 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 Union Carbide Corp filed Critical Union Carbide Corp
Publication of EP0012359A1 publication Critical patent/EP0012359A1/fr
Application granted granted Critical
Publication of EP0012359B1 publication Critical patent/EP0012359B1/fr
Expired 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
    • H01J29/94—Selection of substances for gas fillings; Means for obtaining or maintaining the desired pressure within the tube, e.g. by gettering

Definitions

  • the present invention is directed to a getter assembly for use in television picture tubes. More particularly the present invention is directed to a getter assembly which functions to minimize potentially destructive electrical arc currents in television picture tubes.
  • a known technique for reducing the magnitude of the arc currents is to employ a resistive coating on the inner surface of the picture tube funnel, e.g., composition containing metal oxide, e.g., iron oxide.
  • the resistivity of such coatings is relatively high, on the order of 2,000 to 6,000 ohms per square, and the arc current can be reduced on that account.
  • a film of barium metal is deposited on portions of the inner funnel surface overlying the resistive coating and, at times, can provide a low resistance path and essentially short circuit the resistive coating.
  • a getter assembly for cathode ray tubes comprising a cylindrically shaped metal receptacle having an open top, a side wall member, an upraised bottom portion which with said wall member defines in said receptacle an annular channel having a floor member, the height of said wall member with respect to said floor member being substantially greater than the height of said upraised bottom portion, getter material within said annular channel, a wire support member depending from the bottom of said receptacle the ends of said wire support being bent inwardly toward each other, first downwardly and then upwardly to form two spaced apart curved bases for contacting the wall of a cathode ray tube, said curved bases being entirely located beneath said floor member and spaced inwardly from said side wall member toward said upraised portion.
  • the height of the side wall member is advantageously about 1,5 to 5 times, preferably about 2 times the height of the upraised bottom portion.
  • the curved bases of the support member should be located about 3,30 to 3,81 mm from said floor member.
  • a television picture tube is indicated at 10 having a glass funnel portion 12 joined to neck 14.
  • An electron gun assembly is schematically indicated at 16.
  • An outer conductive coating is provided at 18 and a resistive inner conductive coating is provided at 20.
  • a high voltage is conventionally applied to the resistive inner coating through anode button 22.
  • the above- noted inner and outer coatings constitute a filter capacitor.
  • a getter assembly is provided as shown at 24 mounted on elongated metal spring member, or "antenna" 26 which is attached at 28 to electron gun 16 whereby a path is provided for the transmission of the high voltage on resistive coating 20 to the electron gun 16. This path is incidental to the main high voltage path which is via snubber spring contact 27.
  • the get ter 24 of the present invention is "flashed” the vaporized getter material, e.g., barium, is deposited in the funnel portion 12 as indicated at 30 and bridges a portion of resistive coating 20. If this "bridging" coating of barium were to contact the support member 32 of getter assembly 24, a short circuit of resistive coating 20 would occur in the event of an arc condition.
  • the barium filter 30 is not deposited in the region 34 where the getter support member 32 contacts resistive coating 20.
  • the getter assembly of the present invention comprises a cylindrical getter container or receptacle 40 suitably made of stainless steel having an upraised bottom portion 42 which forms an annular open top channel 44 in which is pressed getter material 46 in the usual manner, e.g., for example 1000 mg. of 25% Ba, 25% Al, 50% Ni exothermic alloy yielding about 225 mg. of Ba on "flashing".
  • the side wall 48 which joins floor member 50 of channel 44 is substantially greater in height than upraised portion 42 with respect to floor member 50, e.g., 1.5 to 5 times greater in height, preferably about 2 times greater in height.
  • Antenna mount 26 is joined to the floor member 50 by spot welds at 52.
  • Wire support member 60 shown in perspective in Figure 3, and with reference to Figures 2(a)-(d), comprise a length of small diameter, e.g., 0.045 inch wire having for convenience a flattened middle portion and having end portions 68, 71 both bent inwardly toward each other. These end portions are bent first downwardly and then upwardly to form curved bases 70, 72.
  • the wire support member 60 is arranged perpendicularly to antenna support 26 and fastened at its flattened midpoint 62 by a spot weld.
  • the wire support member 60 will thus depend downwardly from the bottom of metal receptacle 40 with the curved bases 70, 72 entirely beneath the floor member 50 and spaced inwardly from side wall member 48 toward the upraised portion 42, preferably about midway between the side wall member 48 and upraised portion 42.
  • the vaporized metal upon “flashing" of getter material 46, the vaporized metal will not deposit in region 34 shown in Figures 1 and 4 due to the substantially higher side wall 48 and since region 34 is essentially "shadowed” against the getter material vapor by the floor member 50 of receptacle 40.
  • the inwardly curved base portions 70, 72 rest in resistive region 34 spaced from getter metal film 30.
  • a getter assembly in accor- da nce with the present invention was made with a container of 305 stainless steel having an outer diameter of 19,4 mm (0.765 in.).
  • the height of the container sides was 4,2 mm (0.165 in.)
  • the width of the getter channel floor was 6,0 mm (0.238 in.)
  • the height of the upraised center portion was 1,9 mm (0.076 in.).
  • the wire support was formed of 1,14 mm (0.045 in.) diameter 305 stainless steel wire and held the floor of the getter container 3,9 mm (0.155 in.) from the inner surface of the picture tube when installed.
  • Getter material (25% Ba, 25% Al, 50% Ni) in the amount of 0,000 mg. was pressed in the channel of the getter.
  • arc current was reduced in tests to about 60 amperes from 600 amperes which resulted when getters were used which did not have the conbination of high side walls and "shadowed" support member.
  • the height 77 of wire support member 60 is reduced so that the bottom of receptacle 40 is closer than usual (3,9 mm) to the funnel portion of the picture tube, e.g., about 3,30 to 3,81 mm), in order to enchance the "shadowing" effect.

Landscapes

  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
EP19790104948 1978-12-07 1979-12-05 Dispositif porte-getters destiné aux tubes cathodiques Expired EP0012359B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US96735578A 1978-12-07 1978-12-07
US967355 1978-12-07

Publications (2)

Publication Number Publication Date
EP0012359A1 true EP0012359A1 (fr) 1980-06-25
EP0012359B1 EP0012359B1 (fr) 1982-04-21

Family

ID=25512679

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19790104948 Expired EP0012359B1 (fr) 1978-12-07 1979-12-05 Dispositif porte-getters destiné aux tubes cathodiques

Country Status (4)

Country Link
EP (1) EP0012359B1 (fr)
JP (1) JPS5832896B2 (fr)
CA (1) CA1149857A (fr)
DE (1) DE2962594D1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2536206A1 (fr) * 1982-11-11 1984-05-18 Getters Spa Degazeur pour tubes a rayons cathodiques comportant un support de type ameliore
FR2536582A1 (fr) * 1982-11-23 1984-05-25 Getters Spa Support perfectionne pour produit de degazage
KR101134001B1 (ko) * 2008-12-31 2012-04-05 제일모직주식회사 사구역을 최소화하기 위한 유동층 반응기용 송풍구형 분산판

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61270494A (ja) * 1985-05-22 1986-11-29 株式会社ニチベイ ブラインド用スラツト及びその製造方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2013036A1 (de) * 1969-03-24 1971-09-30 Gen Electric Gettereinheit
DE2427342A1 (de) * 1973-06-12 1975-01-02 Union Carbide Corp Getter-anordnung
DE2516282A1 (de) * 1974-04-16 1975-11-06 Getters Spa Gettereinrichtung
DE1950230B2 (de) * 1968-10-28 1975-11-20 Union Carbide Corp., New York, N.Y. (V.St.A.) Abstützung für eine Getterefnr ich tu ng
DE2303749B2 (de) * 1972-03-30 1977-03-10 Union Carbide Corp., New York, N.Y. (V.St.A.) Leitschirm fuer eine gettervorrichtung
DE2721449A1 (de) * 1976-05-12 1977-12-08 Getters Spa Getteranordnung mit verbesserter halterung

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54159164A (en) * 1978-06-07 1979-12-15 Hitachi Ltd Cathode ray tube

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1950230B2 (de) * 1968-10-28 1975-11-20 Union Carbide Corp., New York, N.Y. (V.St.A.) Abstützung für eine Getterefnr ich tu ng
DE2013036A1 (de) * 1969-03-24 1971-09-30 Gen Electric Gettereinheit
DE2303749B2 (de) * 1972-03-30 1977-03-10 Union Carbide Corp., New York, N.Y. (V.St.A.) Leitschirm fuer eine gettervorrichtung
DE2427342A1 (de) * 1973-06-12 1975-01-02 Union Carbide Corp Getter-anordnung
DE2516282A1 (de) * 1974-04-16 1975-11-06 Getters Spa Gettereinrichtung
DE2721449A1 (de) * 1976-05-12 1977-12-08 Getters Spa Getteranordnung mit verbesserter halterung

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2536206A1 (fr) * 1982-11-11 1984-05-18 Getters Spa Degazeur pour tubes a rayons cathodiques comportant un support de type ameliore
FR2536582A1 (fr) * 1982-11-23 1984-05-25 Getters Spa Support perfectionne pour produit de degazage
GB2130787A (en) * 1982-11-23 1984-06-06 Getters Spa Getter assembly with improved support
US4553065A (en) * 1982-11-23 1985-11-12 Saes Getters S.P.A. Getter assembly with improved support
KR101134001B1 (ko) * 2008-12-31 2012-04-05 제일모직주식회사 사구역을 최소화하기 위한 유동층 반응기용 송풍구형 분산판

Also Published As

Publication number Publication date
JPS5832896B2 (ja) 1983-07-15
EP0012359B1 (fr) 1982-04-21
CA1149857A (fr) 1983-07-12
JPS5580250A (en) 1980-06-17
DE2962594D1 (en) 1982-06-03

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