US1655502A - Incandescent electric lamp - Google Patents

Incandescent electric lamp Download PDF

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Publication number
US1655502A
US1655502A US174626A US17462627A US1655502A US 1655502 A US1655502 A US 1655502A US 174626 A US174626 A US 174626A US 17462627 A US17462627 A US 17462627A US 1655502 A US1655502 A US 1655502A
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US
United States
Prior art keywords
filament
getter
auxiliary electrode
lamp
incandescent
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
US174626A
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English (en)
Inventor
Holst Gilles
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 US1655502A publication Critical patent/US1655502A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/52—Means for obtaining or maintaining the desired pressure within the vessel
    • H01K1/54—Means for absorbing or absorbing gas, or for preventing or removing efflorescence, e.g. by gettering
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K3/00—Apparatus or processes adapted to the manufacture, installing, removal, or maintenance of incandescent lamps or parts thereof
    • H01K3/22—Exhausting, degassing, filling, or cleaning vessels

Definitions

  • the invention relates to incandescent electric lamps, and more particularly 1noandescent lamps in which the absorption of light is reduced by means of a substance usually called a getter, which has the property of transforming the tungsten vaporized from the filament'into a material which absorbs less light.
  • a getter which has the property of transforming the tungsten vaporized from the filament'into a material which absorbs less light.
  • Many chemical substances, such as sodium chloride, cryolite, potassium thallo chloride and calcium fluoride have been used as getters.
  • a getter such as calcium fluoride may be applied to the filament, for example, by spraying or ,dipping before the stem is sealed into the bulb of the incandescent lamps After the lamp is sealed in and exhausted, the filament is heated and the getter evaporates from the filament and precipitates on the inside of the lamp bulb as a transparent or translucent layer.
  • getters such as potassium thallo-chloride
  • One object of this invention is to make incandescent electric-lamps and similar de vices to be made in such a way that the activity of the getter can be regulated at actly in accordance with the amount or" tun sten which evaporates during each unit of time at the filament temperature at which the lamp is designed to operate.
  • the incandescent electric lump or similar device is pro vided with an auxiliary electrode carrying a getter which becomes active, as by generai; ing gas, under the influence of an electrical discharge between the auxiliary electrode and the tilanieut, and while active causes the formation with the evaporated material the filament of transparent chemical com" initiations or compounds.
  • the incandescent lamp When the incandescent lamp is lighted, there will generally be parts of the filament which have a negative potential with respect to the auxiliary electrode, and consequently-a discharge of electrons will. ilow from these parts of the filament, so that the auxiliar electrode will be hitby electrons emitted y these or? the filament. "Un der the influence of this electron bombardmeat the getter on or associated with the auxiliary electrode will be activated, as, for example, by being dissociated, thereby generating a gas which forms with the evaporated tungsten transparent or translucent chemical compounds, and thereby counteracts the absorption of light which would occur if the vaporized-tungsten deposited unchanged onthe walls of the bulb.
  • the auxiliary electrode is connected conductively to one of the terminals of the filament. either directly or through a resistance, and is so located with reference to the filament that the total quantity of tungsten which evaporates at normal filament temperature during each unit of time will chemicallycombine with the gas generated by the getter during the same unit of time.
  • a considerable portion. of the auxiliary electrode is adjacent a portion of the filament, in some cases surrounding a certain part of the filament like a spiral, and is connected to one of the leading-in wires through a resistance it necessary.
  • the drawing shows one form of incandescent electric lamp constructed according to the invention.
  • the filament 1 is a coiled tungsten wire connected to the leads or terminals 2 and 3, which are joined to the leading-in wires 4 and the press 6 of the stem of the lamp.
  • a part of the filament is adiacent an auxiliary electrode 7, which may be in the shape of a large coil surrounding the filament.
  • the elec trode 7 is associated with, and may be covered by a getter, and is connected so as to he of positive potential with reference to the adjacent portion of the filament. as hy being conductively connected to the lead 2.
  • a resistor may be inserted in the circuit between the lead 2 and the auxiliary electrode 7, and may be installeddn the base oi the lamp.
  • the potential difference between this part of the filament and the auxiliary electrode, and consequently the effect of theelectron bombardment, and the resultant activity of i the getter may be regulated as desired.
  • An incandescent lamp comprising a sealed envelope containing a filament and an auxiliary electrode provided with a getter decomposable by an electrical discharge and mounted in such relation to a portion of said filament that at normal operating temperature'of said filament an electrical discharge to said auxiliary electrode causes said getter to evolve a chemically active atmosphere at a rate so related to the rate of vaporization of the filament material that all said vaporized filament material is converted by said atmosphere into translucent compounds as fast as it vaporizes.
  • An incandescent lamp having a sealed envelope containing a filament, and an auxiliary electrode coated with a getter rendered active by an electrical discharge to said electrode, said electrode being connected to one terminal of said filament and mounted in eeaeoa such relation to a part of said filament having a potential diflering from that of said terminal that an electrical discharge occurs between said electrode and said part of the filament during operation of the lamp.
  • An incandescent lamp having a sealed envelope containing a filament, and an auxiliary electrode coated with a getter rendered active by an electrical discharge to said electrode and connected to one terminal of said filament, said electrode being coiled and surrounding, a part of said filament at a potential during operation of the lamp different from the potential of said terminal.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Discharge Lamp (AREA)
US174626A 1926-04-10 1927-03-11 Incandescent electric lamp Expired - Lifetime US1655502A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1655502X 1926-04-10
GB12492/26A GB268986A (en) 1926-04-10 1926-05-14 Improvements in or relating to electric incandescent lamps

Publications (1)

Publication Number Publication Date
US1655502A true US1655502A (en) 1928-01-10

Family

ID=26249053

Family Applications (1)

Application Number Title Priority Date Filing Date
US174626A Expired - Lifetime US1655502A (en) 1926-04-10 1927-03-11 Incandescent electric lamp

Country Status (3)

Country Link
US (1) US1655502A (enrdf_load_stackoverflow)
GB (1) GB268986A (enrdf_load_stackoverflow)
NL (1) NL20578C (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2444423A (en) * 1945-10-08 1948-07-06 Tung Sol Lamp Works Inc Incandescent lamp and the like
US2837680A (en) * 1954-04-28 1958-06-03 Machlett Lab Inc Electrode support
US2864025A (en) * 1953-08-24 1958-12-09 Gen Electric Infrared ray generating device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2444423A (en) * 1945-10-08 1948-07-06 Tung Sol Lamp Works Inc Incandescent lamp and the like
US2864025A (en) * 1953-08-24 1958-12-09 Gen Electric Infrared ray generating device
US2837680A (en) * 1954-04-28 1958-06-03 Machlett Lab Inc Electrode support

Also Published As

Publication number Publication date
NL20578C (enrdf_load_stackoverflow)
GB268986A (en) 1927-04-14

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