US2030430A - Electric lamp - Google Patents

Electric lamp Download PDF

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Publication number
US2030430A
US2030430A US746912A US74691234A US2030430A US 2030430 A US2030430 A US 2030430A US 746912 A US746912 A US 746912A US 74691234 A US74691234 A US 74691234A US 2030430 A US2030430 A US 2030430A
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US
United States
Prior art keywords
envelope
arc
discharge
magnetic
lamp
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
US746912A
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English (en)
Inventor
Davies Leonard John
Gilson Charles
Scott William Joseph
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 US2030430A publication Critical patent/US2030430A/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
    • H01J61/10—Shields, screens, or guides for influencing the discharge
    • H01J61/106—Shields, screens, or guides for influencing the discharge using magnetic means

Definitions

  • This invention relates to electric gaseous discharge lamps and more particularly to lamps of the high pressure vapour arc discharge type.
  • Such lamps usually consist of a sealed envelope 5 containing electrodes and a gas and/or vapour such as mercury vapour through'which the discharge takes place.
  • the envelope may be a tube of quartz or high melting point glass and may be contained in a surrounding enclosure of lU translucent or transparent glass, the space between the envelope and enclosure being evacuated to prevent the transfer of heat from the inner to the outer envelope.
  • a further object of the invention is to provide an improved magnetic control means for operating a high pressure gaseous discharge device whereby the arc is prevented from being deflected against the closing envelope of the device by convection currents in the gaseous filling.
  • a further object of the invention is to provide a high pressure gaseous discharge device with integral magnetic control means whereby the device can be satisfactorily operated in any suitable position.
  • FIG. 1 shows somewhat diagrammatically a high 50 pressure gaseous discharge device when operating in a horizontal position.
  • Fig. 2 shows somewhat diagrammatically a magnetic control means according to the invention applied to a high pressure gaseous discharge device,
  • Fig. 3 illustrates a 55 modification of the arrangement shown in Fig. 2,
  • Fig. 4 a further modification of the arrangement shown in Fig. 2.
  • the current supplied through the gaseous discharge device is caused to energize a winding sur- 5 rounding a magnetic circuit, the lines of force due to which are so directed with respect to the arc discharge within the device as to counteract the tendency of the arc to be deflected by convection currents set up in the gaseous filling due to the heating effect of the arc.
  • an are discharge device comprising an inner envelope l containing electrodes 2 and 3 which is supported within an outer heat conserving envelope 4 to 5 which is attached the customary screw base 5 comprising contacts to which the electrodes 2 and 3 are respectively connected.
  • the electrodes 2 and 3 may be of the unheated type and the composition of the filling of gas within the envelope I is then such that the discharge will occur between the electrodes when a suitable potential is applied therebetween.
  • the filling may consist of a gas such as argon at a low pressure sufiicient to cause a glow discharge to occur between the electrodes 2 and 3 when the operating voltage is applied thereto.
  • the envelope i may also contain a quantity of mercury such that after a glow discharge has been in operation for a predetermined time the mercury is all vaporized causing the pressure within the envelope to rise to a pressure of the order of atmospheric. At such time the glow discharge initiated in argon is converted into an arc discharge in the mercury vapour.
  • the space between inner and outer envelopes is preferably evacuated.
  • High pressure metal vapour lamps are usually operated from an alternating current supply and usually have a stabilizing inductance or choke connected in series with them. If a permanent magnetic field or an uncontrolled alternating current magnet is used to deflect the are undesirable efiects are introduced as with both these arrangements the arc is deflected both ways because as the lamp is operating on alternating current the arc flows first in one direction and then in the other. To utilize a magnetic field therefore to obtain stabilization of the position of the are it is necessary to use an alternating current field which is in the correct phase relationship with the current flowing in the lamp.
  • Such-a field may be applied in practice from a solenoid constituted by winding a suitable number of turns of wire on an iron core which can be mounted in such a position that the lines of force out the lines of force produced by the arc current in a suitable manner.
  • the solenoid may be connected in parallel with the device and choke.
  • a magnetic coil which is connected in series with the device and stabiizing choke as indicated in Fig. 2 of the drawing, in which the stabilizing choke is indicated at I and the magnetic arc control device at 8, as with such an arrangement there is only a negligible loss of energy since the inductance of the magnetic control coil may form part of the necessary stabilizing inductance of the circuit and correct phase relationship is ensured.
  • the magnetic field is in this case provided by an iron core 9 having the necessary series turns l wound upon it. The core is mounted at a suitable distance from the axis of the device as to produce the required deflection of the arc.
  • the magnetic core 9 on which the coil I0 is wound may comprise a sheet of magnetic material such as iron bent into the shape of a U with its downwardly extending arms arranged on either side of the device so that the magnetic field cuts the axis of the device and is distributed therealong.
  • the magnetic control device may form part of the enclosing lantern for the discharge device, a part of the lantern being indicated by dotted lines at II. This part should, of course, be of non-magnetic material and may be of sheet aluminium for example.
  • a gaseous discharge device comprising a tubular envelope, electrodes within said envelope, a vaporizable material within said envelope in an amount just sufiicient to generate a pressure of the order of atmospheric when entirely vaporized, a surrounding enclosure for said envelope, means for, producing an'arc discharge between said electrodes said envelope being located during operation in a position with its axis inclined to the vertical, and magnetic control means located in the space between said envelope and enclosure and energized by the discharge current for counteracting the tendency of the are who deflected from an axial position within said envelope by convection currents set up in said filling by the heat of the arc.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
US746912A 1933-10-06 1934-10-04 Electric lamp Expired - Lifetime US2030430A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB27577/33A GB429750A (en) 1933-10-06 1933-10-06 Improvements in and relating to electric lamps
GB35722/34A GB448707A (en) 1933-10-06 1934-12-12 Improvements in and relating to electric discharge lamps

Publications (1)

Publication Number Publication Date
US2030430A true US2030430A (en) 1936-02-11

Family

ID=32510438

Family Applications (1)

Application Number Title Priority Date Filing Date
US746912A Expired - Lifetime US2030430A (en) 1933-10-06 1934-10-04 Electric lamp

Country Status (5)

Country Link
US (1) US2030430A (fr)
DE (1) DE654969C (fr)
FR (2) FR779256A (fr)
GB (2) GB429750A (fr)
NL (1) NL42568C (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2767343A (en) * 1954-04-05 1956-10-16 Mcgraw Electric Co Electric gaseous discharge device
NL1026622C2 (nl) * 2004-07-09 2006-01-10 Crossworks Contra Consulting B Gasontladingslamp met stabilisatiespoel.

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1098607B (de) * 1959-04-24 1961-02-02 Licentia Gmbh Hochdrucklampe
HU186682B (en) * 1983-04-08 1985-09-30 Tungsram Reszvenytarsasag High-frequency gas-discharge lamp system
CA2126172C (fr) * 1993-06-25 1998-04-28 Minoru Yamamoto Luminaire avec reduction d'interference

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2767343A (en) * 1954-04-05 1956-10-16 Mcgraw Electric Co Electric gaseous discharge device
NL1026622C2 (nl) * 2004-07-09 2006-01-10 Crossworks Contra Consulting B Gasontladingslamp met stabilisatiespoel.

Also Published As

Publication number Publication date
NL42568C (fr) 1938-02-15
FR46827E (fr) 1936-09-12
GB448707A (en) 1936-06-12
GB429750A (en) 1935-06-06
DE654969C (de) 1938-01-05
FR779256A (fr) 1935-04-02

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