US2454572A - Electric discharge tube - Google Patents

Electric discharge tube Download PDF

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Publication number
US2454572A
US2454572A US711657A US71165746A US2454572A US 2454572 A US2454572 A US 2454572A US 711657 A US711657 A US 711657A US 71165746 A US71165746 A US 71165746A US 2454572 A US2454572 A US 2454572A
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US
United States
Prior art keywords
base portion
exhaust tube
glass
tube
metal
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
US711657A
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English (en)
Inventor
Roovers Wilhelmus Antonius
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.)
HARTFORD NAT BAND AND TRUST CO
HARTFORD NATIONAL BAND AND TRUST Co
Original Assignee
HARTFORD NAT BAND AND TRUST CO
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 HARTFORD NAT BAND AND TRUST CO filed Critical HARTFORD NAT BAND AND TRUST CO
Application granted granted Critical
Publication of US2454572A publication Critical patent/US2454572A/en
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
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/50—Means forming part of the tube or lamps for the purpose of providing electrical connection to it

Definitions

  • This invention relates to electric discharge tubes, the bulb of which is sealed by m'eansof a glass bottom which comprises the contact studs and in which an exhaust tube is provided, and more particularly to the construction of the exhaust tube.
  • a metal exhaust tube to a metal tube bottom entails little difficulty, whilst a very strong, construction can be ensured.
  • the matter is entirely diiferent, however, if the bottom plate is made from glass. Since a centreing stud, particularly if it serves at the same time as a location lug, may be subjected to heavy forces on introducing the tube into the holder, the use of a metal exhaust tube as a centrein stud in combination with a glass bottom was considered to be unsuitable. Hence if, for some reason or other, a metal exhaust tube was sealed into a glass bottom plate, this tube was always surrounded by a protecting bush which could be shaped into the form of a centreing stud and location device.
  • the use of a glass bottom plate has many advantages with regard tov a simple manufacture, the capacity between the supply conductors and the length of the leakage paths. Also in the case of very short waves the use of a glass bottom is desirable.
  • the said disadvantages ar obviated by providing that in an electric discharge tube, the bulb of which issealed by means of a glassbottom, into which contact members and a central metal exhaust tube are sealed, the exhaust tube is, according to the invention, shaped into the form of a centreing stud and a location member and serves at the same time for holding the tube in the holder.
  • the exhaust tube is made from a metal or a metal alloy, the coefficient of, expansion of which is adapted to that of the glass, in order to avoid as much as possible the occurrence of internal stresses.
  • a very suitable combination is obtained, if an exhaust tube of ferrochromium is sealed into a bottom of pressed glass substantially having the following composition: SiOz 51%; PbO; 32.2%; CaO 2%; K20 13.3%; NazO 1.5%.
  • the centreing body proper which comprises the location lug, from iron, for example. This permits th centreing body to be soldered, preferably by means of copper, to the sealed ferrochromium part. in a vacuum-tight manner.
  • the glass of the bottom plate has such a structure that it consists of from 5 to 10% of scattered cavities. In this case, it is even not impossibl to make the whole of the exhaust tube from iron and to seal it into the aforesaid kind of glass.
  • the reference numeral l designates the bulb of a discharge tube which, in the present case, is made from glass, but may also be made of metal and which is sealed by means of a glass bottom plate 2.
  • the contact members 3 Into this bottom plate 2 are sealed the contact members 3 and a tubule 4 which may consist of ferrochromium.
  • this tubule 4 has soldered to it in a vacuum tight manner, for example by means of copper, the centreing body 5 proper.
  • the body 5 possesses a location lug 6 and a circular groove 1 which serves to hold the tube in the holder.
  • the aperture in the body 5 may be closed by means of a plug 9.
  • the body 5 may be slightly let in the bottom of the tube, as shown in the drawing, but it may also rest on the bottom surface of the plate.
  • the bulb of the tube is designated I0, the glass bottom plate i l.
  • the contact members l2 and the exhaust tube 13 which entirely consists of ferrochromium.
  • this exhaust tube is possessed of a location lug M, a groove l5 and is closed by means of a plug 16.
  • An electric discharge tube base assembly comprising a glass base portion provided with a central aperture, an envelope portion hermetically sealed to the periphery of said base portion, a plurality of electric contact pin members concentric to said aperture and extending from the inner and outer sides of said base portion, and a metal member centrally positioned with. respect to said contact pins having a given portion thereof hermetically sealed to said base portion and an end portion thereof integrally united to said given portion and extending beyond the outer end of said contact pin members, said 2 metal member being provided with a central bore ccinciclent to the aperture of said base portion and open to the inner side of said base portion, and the end portion of said metal member con prising a member on the peripheral surface thereof and means to hermetically seal said central bore.
  • An electric discharge tube base assembly comprising a glass base portion provided with a central aperture, an envelope portion hermetically sealed to the periphery of said base portion, a plurality of electric contact pin members concentric to said aperture and extending from the inner and outer sides of said base portion, and a metal member centrally positioned with respect to said contact pins and having a given portion thereof hermetically sealed to said base portion and an end portion thereof integrally united to said given portion and extending beyond the outer end of said contact pin members, said r metal member being provided With a central bore coincident to the aperture of said base portion and open to the inner side of said base portion, the portion of said metal member sealed to said base portion having a temperature coefficient of expansion substantially equal to the temperature coeificient of expansion of said base portion, and the end portion of said metal member comprising a longitudinally extending location lug member on the peripheral surface thereof and means to hermetically seal said central bore.
  • An electric discharge tube base assembly comprising a glass base portion provided with a central aperture, an envelope portion hermetically sealed to the periphery of said base portion, a plurality of electric contact pin members concentric to said aperture and extending from the inner and outer sides of said base portion, and a metal member centrally positioned with respect to said contact pins and comprising a ferrochromium portion hermetically sealed to said base portion and extending beyond the outer side of said base and an iron tubular portion integrally united and hermetically secured to the said extending ferrochromium portion and extending beyond the outer end of said contact pin members, said ferrochromium portion being provided with a central bore coincident to the aperture of said base portion and open to the inner side of said base portion, and the said iron tubular portion comprising a longitudinally extending location lug member on the peripheral surface thereof and means within said iron tubular portion hemetically sealing the bore thereof.
  • An electric discharge tube base assembly comprising a glass base portion provided with a central aperture, an envelope portion hermetically sealed to the periphery of said base portion, a plurality of electric contact pin members concentric to said aperture and extending from the inner and outer sides of said base portion, and a metal alloy member centrally positioned with respect to said contact pins and having a given portion thereof hermetically sealed to said base portion and an end portion thereof integrally united to said given portion and extending beyond the outer end of said contact pin members, said metal alloy member being provided with a central bore coincident to the aperture of said base portion and open to the inner side of said base portion and having a temperature coefiicient of expansion substantially equal to the temperature coefficient of expansion of said base portion, and the end portion of said metal alloy member comprising a longitudinally extending location lug member on the peripheral surface thereof and means Within said end portion hermetically sealing said central bore.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Glass Compositions (AREA)
US711657A 1945-10-12 1946-11-22 Electric discharge tube Expired - Lifetime US2454572A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL257237X 1945-10-12

Publications (1)

Publication Number Publication Date
US2454572A true US2454572A (en) 1948-11-23

Family

ID=19781364

Family Applications (1)

Application Number Title Priority Date Filing Date
US711657A Expired - Lifetime US2454572A (en) 1945-10-12 1946-11-22 Electric discharge tube

Country Status (5)

Country Link
US (1) US2454572A (fr)
BE (1) BE469305A (fr)
CH (1) CH257237A (fr)
FR (1) FR943009A (fr)
GB (1) GB618284A (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2692298A (en) * 1952-04-29 1954-10-19 Westinghouse Electric Corp Tubulation and lead-in construction
US2840791A (en) * 1955-09-07 1958-06-24 Jr Franklin Page Mounting for plug-in units
US3198371A (en) * 1960-12-30 1965-08-03 Csf Sealing arrangement for electron discharge devices
US3422300A (en) * 1966-06-30 1969-01-14 Westinghouse Electric Corp Ceramic arc tube and closure member construction
US3603661A (en) * 1965-01-21 1971-09-07 Gen Electric Vacuum seal
US4580005A (en) * 1983-07-02 1986-04-01 International Standard Electric Corporation Wash-tight electromagnetic relay
US4628147A (en) * 1984-04-27 1986-12-09 Westinghouse Brake And Signal Company Limited Semiconductor housings

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2089044A (en) * 1936-05-16 1937-08-03 Rca Corp Electron discharge tube
US2205502A (en) * 1938-06-09 1940-06-25 Rca Corp Electron discharge tube

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2089044A (en) * 1936-05-16 1937-08-03 Rca Corp Electron discharge tube
US2205502A (en) * 1938-06-09 1940-06-25 Rca Corp Electron discharge tube

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2692298A (en) * 1952-04-29 1954-10-19 Westinghouse Electric Corp Tubulation and lead-in construction
US2840791A (en) * 1955-09-07 1958-06-24 Jr Franklin Page Mounting for plug-in units
US3198371A (en) * 1960-12-30 1965-08-03 Csf Sealing arrangement for electron discharge devices
US3603661A (en) * 1965-01-21 1971-09-07 Gen Electric Vacuum seal
US3422300A (en) * 1966-06-30 1969-01-14 Westinghouse Electric Corp Ceramic arc tube and closure member construction
US4580005A (en) * 1983-07-02 1986-04-01 International Standard Electric Corporation Wash-tight electromagnetic relay
US4628147A (en) * 1984-04-27 1986-12-09 Westinghouse Brake And Signal Company Limited Semiconductor housings

Also Published As

Publication number Publication date
FR943009A (fr) 1949-02-24
CH257237A (fr) 1948-09-30
BE469305A (fr)
GB618284A (en) 1949-02-18

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