US2266800A - Electric discharge lamp - Google Patents

Electric discharge lamp Download PDF

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Publication number
US2266800A
US2266800A US256498A US25649839A US2266800A US 2266800 A US2266800 A US 2266800A US 256498 A US256498 A US 256498A US 25649839 A US25649839 A US 25649839A US 2266800 A US2266800 A US 2266800A
Authority
US
United States
Prior art keywords
filament
lead
envelope
wires
voltage
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
US256498A
Other languages
English (en)
Inventor
Robert F Reed
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.)
Hygrade Sylvania Corp
Original Assignee
Hygrade Sylvania 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
Priority to BE481281D priority Critical patent/BE481281A/xx
Application filed by Hygrade Sylvania Corp filed Critical Hygrade Sylvania Corp
Priority to US256498A priority patent/US2266800A/en
Application granted granted Critical
Publication of US2266800A publication Critical patent/US2266800A/en
Priority to FR950547D priority patent/FR950547A/fr
Priority to GB21687/47A priority patent/GB646386A/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
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/067—Main electrodes for low-pressure discharge lamps
    • H01J61/0672—Main electrodes for low-pressure discharge lamps characterised by the construction of the electrode

Definitions

  • This invention relates to electric discharge devices, and particularly to such devices employing a thermionic electrode.
  • An object of the invention is to provide for such a device an electrode whose lead-in and support wires are arranged'to start an auxiliary discharge sufiicient to facilitate the starting of the main discharge in the device.
  • Another object is to properly proportion the various parts of the electrode and discharge device and their auxiliary equipment to insure that such auxiliary discharge occurs.
  • Still another object is to provide anelectrode mount which is easily assembled in manufacture.
  • Figure 1 is a profile view, partly in section, of a lamp according to the invention.
  • Figure '2 is a view of the electrode of Figure 1, in a plane perpendicular to that of Figure 1;
  • Figure 3 is a view of the -clamped end of the filament of that electrode
  • Figure 4 is a view of the electrode arranged in a slightly different manner.
  • Figure 5 is a view of the electrode of Fig. 4, in a plane perpendicular to that of Fig, 4.
  • the tubular glass envelope I is sealed at each end. to a reentrant stem 2 through which the lead-in wires 3, 4 pass at the press Hi, to support the coiled wire electrode 5.
  • the envelope has the coating 6 of fluorescent material on its inner'surface, and has a filling of inert gas and mercury vapor, for example.
  • the lead-in wires project forwardashort distance from the stem, and are bent at point 8 into a plane perpendicular to the tube-axis.
  • Figure 2 shows a plan view of the electrode in that perpendicularpl'ane the lead-in wires 3, 4, project toward each other in opposite but essentially parallel directions to the points 9, Ill,
  • the filament is preferably proportioned so that the voltage drop across it with a current suflicient to bring it to the electron-emitting temperature is slightly greater than the resonance or ionization voltage of the gas or vapor in the tube. There will then be sufficient voltage between each end of the filament and the lead-in wire to the opposite end to cause a discharge through the gas between said end, say end II, and lead-in wire, say 4. This local discharge will excite the gas along the main path along the length of the glass envelope and permit. the starting of that discharge.
  • the filament voltage is preferably applied a few seconds before the main voltage, and may be cut off as soon as the main voltage is applied thefilament then acting as a self-heating electrode.
  • the filament in my mount be supported in what I will call a left-handed direction.
  • the filament On looking down at the filament, as in Figure 2, we find that the filament is placed along a diagonal extending downward to the left (or upward to the right, which is the same thing). I find that such an arrangement is to be preferred, for manufacturing purposes, to the arrangement in which the filament extends along the opposite, orright handed diagonal (which,
  • -e filament 5 is preferably made of tungsten wire, and by properly proportioning the diameter and length of the wire, the filament can be made to have a voltage drop greater than the resonance or ionization voltage of the gas or vapor in the tube at a current sufficient. to raise the temperature of the filament to an electron-emitting value sufiicient to operate the discharge.
  • a tubular glass envelope sealed to an end of said envelope to close off the same, two lead-in wires sealed through said stem in a direction approximately parallel to the axis of the tubular envelope and bent in opposite but parallel direc-. tions into a plane perpendicular to, said axis and at a short distance above the press of the stem,
  • a glass envelope a stem sealed to an end of said envelope to close of! the same, two lead-in wires sealed through the press or said stem and bent into a plane substantially perpendicular to the axis of said stem, an oxide-coated coiled filament in said plane, each end of said filament being clamped to an end or one of the lead-in wires,
  • the lead-in wires being disposed so that each end of the filament is near a portion of the lead-in wire to the other end or the filament.
  • a tubular glass envelope a stem sealed to mend of said envelope to close ofl the same, a doublycoiled, oxide-coated tungsten wire filament supported with its axis straight and substantially in a plane perpendicular to the axis of said tubular envelope, and two wires extending parallel to said filament and on opposite sides of said filament and in substantially the same perpendicular plane as the filament, each or ,said straight wires being connected to an end of said filament.

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  • Discharge Lamp (AREA)
US256498A 1939-02-15 1939-02-15 Electric discharge lamp Expired - Lifetime US2266800A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE481281D BE481281A (enrdf_load_stackoverflow) 1939-02-15
US256498A US2266800A (en) 1939-02-15 1939-02-15 Electric discharge lamp
FR950547D FR950547A (fr) 1939-02-15 1947-07-31 Lampe à décharge électrique
GB21687/47A GB646386A (en) 1939-02-15 1947-08-07 Electric gaseous discharge device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US256498A US2266800A (en) 1939-02-15 1939-02-15 Electric discharge lamp

Publications (1)

Publication Number Publication Date
US2266800A true US2266800A (en) 1941-12-23

Family

ID=22972455

Family Applications (1)

Application Number Title Priority Date Filing Date
US256498A Expired - Lifetime US2266800A (en) 1939-02-15 1939-02-15 Electric discharge lamp

Country Status (4)

Country Link
US (1) US2266800A (enrdf_load_stackoverflow)
BE (1) BE481281A (enrdf_load_stackoverflow)
FR (1) FR950547A (enrdf_load_stackoverflow)
GB (1) GB646386A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2733368A (en) * 1951-03-29 1956-01-31 Kolkman

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2733368A (en) * 1951-03-29 1956-01-31 Kolkman

Also Published As

Publication number Publication date
BE481281A (enrdf_load_stackoverflow)
GB646386A (en) 1950-11-22
FR950547A (fr) 1949-09-29

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