US3706901A - Discharge lamp provided with a substantially straight oblong discharge tube - Google Patents

Discharge lamp provided with a substantially straight oblong discharge tube Download PDF

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Publication number
US3706901A
US3706901A US119488A US3706901DA US3706901A US 3706901 A US3706901 A US 3706901A US 119488 A US119488 A US 119488A US 3706901D A US3706901D A US 3706901DA US 3706901 A US3706901 A US 3706901A
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United States
Prior art keywords
discharge tube
terminal wire
outer envelope
discharge
lamp
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Expired - Lifetime
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US119488A
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English (en)
Inventor
Gerard Marie Jules De Neve
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US Philips Corp
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US Philips Corp
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Publication date
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    • 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

  • the invention provides a solution in which a simple positioning of the discharge tube in the outer envelope can be obtained with the aid of an elongated part of the terminal wire.
  • This solution is combined with an anti-shadow winding of that part of the terminal wire, which extends along the straight part of the discharge tube. By using this anti-shadow winding there need not be the risk of cracks in the outer envelope as a result of expansion of the terminal wire (by heat produced in the discharge tube).
  • the invention relates to a discharge lamp provided with a substantially straight, oblong discharge tube and an outer envelope surrounding this tube, a convolute part of a terminal wire constituting a centring member of the discharge tube and at least a portion of the convolute part of the terminal wire bearing upon the inner side of an end part of the outer envelope.
  • a discharge lamp of the kind mentioned above is described, for example, in United Kingdom Pat. specification No. 440,138.
  • the convolution in this known lamp is rather elastic. It is true that this construction provides a satisfactory resilient support thereby, but a disadvantage is that during the manufacture it is difficult to give the discharge tube a very defined position in the outer envelope. (A method of giving a lamp part a very defined position is sometimes referred to as positioning.)
  • positioning In fact, when in the manufacture of a lamp of the known type only the mentioned convolute part of the terminal wire would be used for positioning, a discharge tube of one specimen, when introduced into an outer envelope, would sag into this outer envelope farther than another discharge tube of the same type. This is a drawback because further steps should then have to be taken to obtain a satisfactory positioning.
  • An object of the present invention is to render a simple centration of the discharge tube in the outer envelope possible in a discharge lamp of the kind described, while the centring device also ensures a satisfactory positioning during manufacture.
  • a discharge lamp provided with a substantially straight, oblong discharge tube and an outer envelope surrounding said tube in which a convolute part of a terminal wire constitutes a centring member of the discharge tube, and in which at least a portion of the convolute part of the terminal wire bears upon the inner side of an end part of the outer envelope is characterized in that substantially the entire convolute part of the terminal wire near the end part of the outer envelope bears against the inner side of said end part, the part of the terminal wire extending along the straight part of the discharge tube being bent in such a manner that its center of gravity is located alongside the terminal wire and in which the center line of the last-mentioned part of the terminal wire can only have tangents which constitute an angle of less than with the longitudinal axis of the lamp.
  • the envelope cannot crack when the temperature is increased (for example, when the lamp is switched on) because the terminal wire which extends along the straight part of the discharge tube can bend to some extent.
  • An additional advantage is that the entire con struction of the terminal wire may be fairly rigid due to the fairly small angle constituted by the terminal wire with the axis of the lamp.
  • the end part of the outer envelope is formed as a disc which is at right angles to the longitudinal axis of the outer envelope.
  • the convolution of the terminal wire is also in a plane at right angles to this longitudinal axis.
  • the center line of the convolute part of the terminal wire located near the end part of the outer'envelope is substantially located in a flat plane containing the longitudinal axis of the lamp.
  • An advantage of this embodiment is that a shape of the outer envelope which is handy in practice can be accompanied by a simple shape of the convolution while no sharp corners are present in the terminal wire.
  • the part of the terminal wire extending along the straight part of the discharge tube consists of two straight pieces enclosing an angle. In that case, the center of gravity of this portion is also outside the terminal wire and these pieces of the terminal wire can be expanded upon heating because they can be bent.
  • the part of the terminal wire extending along the straight part of the discharge tube is helically bent and has a pitch which is approximately three times the length of the discharge tube.
  • An advantage of this embodiment is that the influence of the terminal wire on the distribution of the light is very slight. In fact, due to thisvwound terminal wire (anti-shadow winding) the influence of this terminal wire on the light being emitted into a certain direction is only slight.
  • FIG. 1 shows a discharge lamp according to the invention
  • FIG. 2 is a longitudinal section through an end part of the lamp of FIG. 1.
  • the reference numeral 1 denotes a glass outer envelope of a high-pressure sodium vapor discharge lamp. This is a lamp of approximately 400 Watts having a length of approximately 27.5 cms.
  • the reference numeral2 denotes lamp cap;
  • the reference numeral 3 denotes a discharge tube in the outer envelope 1.
  • the reference numeral 4 denotes a pinch through which two electric supply conductors 5 and 6 extend.
  • the supply conductor 5 is connected to a conductor 7 which is loosely inserted on the other side into a tubular current supply member 8 which is provided at one end of the discharge tube 3.
  • a stranded wire 9 is secured to the conductor 7 which wire is in electrical contact with the outer circumference of the current supply member 8.
  • the supply conductor 6 is connected to a terminal wire which consists of a helical part and a convolute part 11.
  • a rigid current supply strip 12 which is connected to a tubular current supply member 13 of the discharge tube 3 is secured to the portion of the helical part 10 facing the convolute part 11.
  • the convolution 11 bears against the semi-convex end part of the outer envelope 1. This can be seen more clearly in FIG. 2.
  • FIG. 2 shows a portion of the lamp of FIG. 1 in which the outer envelope 1 is intersected.
  • the same reference numerals in FIG. 2 and FIG. 1 relate to the same components.
  • the diameter of the outer envelope l was 4.6 cms and the diameter of the discharge tube 3 was 0.95 cm.
  • the length of the discharge tube 3 was approximately I 1.5 cms.
  • the terminal wire '10 and the convolution ll consisted of nickel including a small addition of manganese.
  • the thickness of the wire was approximately 2 mms.
  • a tangent to the center line of the wire 10 constituted a maximum angle of with the longitudinal axis of the lamp. (The center line of the wire is understood to mean the line which is constituted by the centers of the cross-sections of this wire).
  • the pitch of the wire 8 was approximately 35 cms, thus approximately three times the length of the discharge tube 3.
  • the positioning of the discharge tube 3 in the outer envelope 1 is simple, for the combination 3 to 13 inclusive is slid into the outer envelope 1 until the convolution 11 engages the round end part of this outer envelope.
  • the terminal wire piece 10 When using this construction it need not be feared that damage of the outer envelope will occur when the lamp is switched on, for the terminal wire piece 10 will expand when heat is generated in the discharge tube but due to its so-called anti-shadow winding, namely the helical form in which it is bent, this expansion only causes this piece of wire terminal 10 to be bent out further.
  • the convolution 11 also serves as a centring member.
  • the construction described leads to a discharge light source whose discharge tube can be satisfactorily positioned in a simple manner and in which the risk of damage of the outer envelope by fluctuations in temperature is only small.
  • a discharge lamp provided with a substantially straight, oblong discharge tube and an outer envelope surrounding said tube in which a convolute part of a terminal wire constitutes a centring member of the discharge tube, wherein substantially the entire convolute part of the terminal wire near the end part of the outer envelope bears against the inner side of said end part, the part of the terminal wire extending along the straight part of the discharge tube being bent in such a manner that its center of gravity is located alongside the terminal wire and in which the center line of the last mentioned part of the terminal wire can only have tan? gents which constitute an angle of greater than 0 but less than 25 with the longitudinal axis of the lamp.
  • a discharge lamp as claimed in claim 1 charac-

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  • Vessels And Coating Films For Discharge Lamps (AREA)
US119488A 1970-03-14 1971-03-01 Discharge lamp provided with a substantially straight oblong discharge tube Expired - Lifetime US3706901A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7003667A NL7003667A (no) 1970-03-14 1970-03-14

Publications (1)

Publication Number Publication Date
US3706901A true US3706901A (en) 1972-12-19

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US119488A Expired - Lifetime US3706901A (en) 1970-03-14 1971-03-01 Discharge lamp provided with a substantially straight oblong discharge tube

Country Status (5)

Country Link
US (1) US3706901A (no)
BE (1) BE764229A (no)
DE (1) DE2110290A1 (no)
FR (1) FR2084552A5 (no)
NL (1) NL7003667A (no)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4401913A (en) * 1981-06-03 1983-08-30 Gte Products Corporation Discharge lamp with mount providing self centering and thermal expansion compensation
US4529908A (en) * 1981-10-16 1985-07-16 U.S. Philips Corporation Electric incandescent lamp for a motor-car
US4766338A (en) * 1984-12-21 1988-08-23 North American Philips Corporation Arc discharge lamp
US5001384A (en) * 1988-03-25 1991-03-19 U.S. Philips Corporation Electric gas discharge lamp including an outer envelope and supporting frame
US20030062831A1 (en) * 2001-10-01 2003-04-03 Alderman John C. Ceramic HID lamp with special frame wire for stabilizing the arc
US20060214588A1 (en) * 2005-03-24 2006-09-28 Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh High-pressure discharge lamp
WO2007129232A2 (en) * 2006-05-08 2007-11-15 Koninklijke Philips Electronics N.V. Compact hid arc lamp having shrouded arc tube and helical lead wire
US20100013389A1 (en) * 2006-10-11 2010-01-21 Koninklijke Philips Electronics N.V. Metal halide lamp having a discharge vessel surrounded by an outer envelope

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB440138A (en) * 1934-10-30 1935-12-20 Gen Electric Co Ltd Improvements in or relating to electric discharge vessels
US2173261A (en) * 1936-04-22 1939-09-19 Westinghouse Electric & Mfg Co Mounting for high pressure discharge lamps
US2425865A (en) * 1946-10-19 1947-08-19 Gen Electric Filament supporting structure for incandescent lamps
US3300675A (en) * 1964-04-03 1967-01-24 Deshaw Zoltan Electric incandescent lamp filament support
US3425864A (en) * 1965-07-21 1969-02-04 Templeton Coal Co Method for making electric resistance heaters
FR1557527A (no) * 1967-03-31 1969-02-14

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB440138A (en) * 1934-10-30 1935-12-20 Gen Electric Co Ltd Improvements in or relating to electric discharge vessels
US2173261A (en) * 1936-04-22 1939-09-19 Westinghouse Electric & Mfg Co Mounting for high pressure discharge lamps
US2425865A (en) * 1946-10-19 1947-08-19 Gen Electric Filament supporting structure for incandescent lamps
US3300675A (en) * 1964-04-03 1967-01-24 Deshaw Zoltan Electric incandescent lamp filament support
US3425864A (en) * 1965-07-21 1969-02-04 Templeton Coal Co Method for making electric resistance heaters
FR1557527A (no) * 1967-03-31 1969-02-14

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4401913A (en) * 1981-06-03 1983-08-30 Gte Products Corporation Discharge lamp with mount providing self centering and thermal expansion compensation
US4529908A (en) * 1981-10-16 1985-07-16 U.S. Philips Corporation Electric incandescent lamp for a motor-car
US4766338A (en) * 1984-12-21 1988-08-23 North American Philips Corporation Arc discharge lamp
US5001384A (en) * 1988-03-25 1991-03-19 U.S. Philips Corporation Electric gas discharge lamp including an outer envelope and supporting frame
US20030062831A1 (en) * 2001-10-01 2003-04-03 Alderman John C. Ceramic HID lamp with special frame wire for stabilizing the arc
US6844676B2 (en) * 2001-10-01 2005-01-18 Koninklijke Philips Electronics N.V. Ceramic HID lamp with special frame wire for stabilizing the arc
US20060214588A1 (en) * 2005-03-24 2006-09-28 Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh High-pressure discharge lamp
WO2007129232A2 (en) * 2006-05-08 2007-11-15 Koninklijke Philips Electronics N.V. Compact hid arc lamp having shrouded arc tube and helical lead wire
WO2007129232A3 (en) * 2006-05-08 2008-06-26 Koninkl Philips Electronics Nv Compact hid arc lamp having shrouded arc tube and helical lead wire
US20100013389A1 (en) * 2006-10-11 2010-01-21 Koninklijke Philips Electronics N.V. Metal halide lamp having a discharge vessel surrounded by an outer envelope

Also Published As

Publication number Publication date
FR2084552A5 (no) 1971-12-17
NL7003667A (no) 1971-09-16
DE2110290A1 (de) 1971-10-07
BE764229A (fr) 1971-09-13

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