US2030437A - Electric discharge device - Google Patents

Electric discharge device Download PDF

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Publication number
US2030437A
US2030437A US750A US75035A US2030437A US 2030437 A US2030437 A US 2030437A US 750 A US750 A US 750A US 75035 A US75035 A US 75035A US 2030437 A US2030437 A US 2030437A
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US
United States
Prior art keywords
envelope
electric discharge
sealed
tube
container
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
US750A
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English (en)
Inventor
Francis Victor James
Ryde John Walter
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.)
General Electric Co
Original Assignee
General Electric 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 General Electric Co filed Critical General Electric Co
Application granted granted Critical
Publication of US2030437A publication Critical patent/US2030437A/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
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/34—Double-wall vessels or containers

Definitions

  • This invention relates to electric discharge devices of the type comprising an inner tube adaptedto carry a high pressure metal vapour discharge and a hermetically sealed envelope enclosing the inner tube similar to that disclosed in the United States Patent #1,948,261, granted February 20, 1934;, to Victor James Francis and John Walter Ryde.
  • the envelope has therefore hitherto been evacuated. Further although it is not always necessary to this function, the evacuation is usually carried so far that the pressure in the sealed envelope is much less than 1 mm.
  • metal for example a metal band supporting it and connected to one electrode, the deposit forms most readily in the neighbourhood of the metal. But the deposit forms, although in general less rapidly,' even in the absence of any metal in contact with the outside of the inner tube. This dark deposit reduces the intensity of the light emitted by the device and lowers the efficiency of the device.
  • the object of the present invention is to provide an electric discharge lamp of the high vapour pressure type in which blackening of the inner surface of the inner tube is reduced to a minimum.
  • Another object of the invention is to provide an efficient, long lived electric discharge vapor lamp. Still further objects and advantages attaching to the device and to its use and operation will be apparent to those skilled in the art from the following particular description.
  • Nitrous oxide These pressures were determined with lamps of the high vapor pressure type now known in commerce and which operated on an A. C. supply of 230 volts. It is possible that different values might be obtained with different types of lamp.
  • Oxygen and hydrogen are, then, the most eflicient gases. Oxygen is slightly preferable to hydrogen, because the high thermal conductivity of the latter increases the time required for the lamp to attain its steady operating state.
  • the manufacture of electric discharge devices according to the invention need difier from that of known devices of the type specified only in the introduction of gas into the space between the inner tube and outer envelope. If the gas to be introduced is air, the evacuation of the envelope may be stopped when the air originally present has been reduced to the desired pressure, and the envelope then sealed off. If the gas is other than air (and permissibly even if it is air), the envelope is completely evacuated, the gas introduced to the desired pressure, and the envelope sealed off. i
  • the luminous tube comprises internal envelope of glass I having approximately spherical ends ⁇ into which are sealed the leading-in wires 3.
  • the thermionic electrodes each consisting of a short refractory rod 5 composed of a mixture of calcium and barium oxides surrounded by a tungsten spiral 4; two turns 6 of the spiral, free of the rod, are used as the curved part of the leads for preventing the conduction of excessive heat to the seals.
  • the electrodes are mounted very close to the spherical ends of the tube, being not more than 10 mm. from the wall. In' order further to promote the heating of the ends of the tube, these may be covered with caps of thin metal foil.
  • the internal envelope I is arranged within an outer envelope I (shown as partly cut away in the,
  • the internal envelope contains enough mercury to give a pressure of about 1 atmosphere when operating on a current of from 2 to 3 amperes-in the case of a tube about 17 cm. long by 3 cm. diameter, for example, about 0.2 to 0.25 gm. of mercury are adequate-together with a few mm. of argon to facilitate starting.
  • a wire I! is carried from one of the leads along the outside of the inner envelope to a point near the other electrode of the tube and there wound round the outside of the inner envelope to form a conductive ring I I.
  • an auxiliary electrode may be put inside the tube, near one of the main electrodes and connected to another main electrode in a known manner by a high reistance.
  • the use of the outer envelope with these forms of starting arrangement is particularly convenient, for it permits live conductors to be run along the outside of the discharge tube proper, without any danger that they may be accidentally touched.
  • the outer envelope 1 is exhausted after assembly and a quantity of gas, such as oxygen or hydrogen, at a pressure of approximately 10 mm. is introduced into said envelope I and said envelope 1 is then sealed off.
  • a quantity of gas such as oxygen or hydrogen, at a pressure of approximately 10 mm.
  • the presence of the gas in I the outer envelope 1 retards the formation of dark deposits on the inner surface of the inner envelope I as pointed out above.
  • An electric dischargewdevice comprising a container, electrodes sealed therein, a quantity of vaporizable material therein, a sealed envelope for said container and a gas in said envelope under a pressure greater than 1 mm. to retard the formation of dark deposits on the inner surface of said container.
  • An electric discharge device comprising a container, electrodes sealed therein, a quantity of vaporizable material therein a sealed envelope for said. container and oxygen in said envelope at a pressure greater than 1 mm. to retard the formation of dark deposits on the inner surface of said container.
  • An electric discharge device comprising a container, electrodes sealed therein, a quantity of vaporizable material therein, a sealed envelope for said container and hydrogen in said envelope at a pressure greater than 1 mm. to retard the formation of dark deposits on the inner surface of said container.
  • An electric discharge device comprising a container, electrodes sealed therein, a quantity of vaporizable material therein, a sealed envelope for said container and air in said envelope at a pressure greater than 5 mm. to retard the formation of dark deposits on the inner surface of said container.

Landscapes

  • Discharge Lamp (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
US750A 1934-01-12 1935-01-07 Electric discharge device Expired - Lifetime US2030437A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1221/34A GB431651A (en) 1934-01-12 1934-01-12 Improvements in or relating to electric discharge devices

Publications (1)

Publication Number Publication Date
US2030437A true US2030437A (en) 1936-02-11

Family

ID=9718224

Family Applications (1)

Application Number Title Priority Date Filing Date
US750A Expired - Lifetime US2030437A (en) 1934-01-12 1935-01-07 Electric discharge device

Country Status (5)

Country Link
US (1) US2030437A (enrdf_load_stackoverflow)
DE (1) DE647009C (enrdf_load_stackoverflow)
FR (1) FR784009A (enrdf_load_stackoverflow)
GB (1) GB431651A (enrdf_load_stackoverflow)
NL (1) NL41741C (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3714492A (en) * 1971-05-03 1973-01-30 Gte Sylvania Inc Dc fluorescent lamp with improved efficiency
FR2386135A1 (fr) * 1977-03-30 1978-10-27 Gte Sylvania Inc Perfectionnement apporte aux lampes a vapeur de sodium a haute pression
US4598225A (en) * 1983-02-25 1986-07-01 Gte Products Corporation Electric lamp with high outer-envelope to inner-envelope wall-thickness ratio

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3714492A (en) * 1971-05-03 1973-01-30 Gte Sylvania Inc Dc fluorescent lamp with improved efficiency
FR2386135A1 (fr) * 1977-03-30 1978-10-27 Gte Sylvania Inc Perfectionnement apporte aux lampes a vapeur de sodium a haute pression
US4598225A (en) * 1983-02-25 1986-07-01 Gte Products Corporation Electric lamp with high outer-envelope to inner-envelope wall-thickness ratio

Also Published As

Publication number Publication date
NL41741C (enrdf_load_stackoverflow)
GB431651A (en) 1935-07-12
DE647009C (de) 1937-06-25
FR784009A (fr) 1935-07-20

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