EP0217290B1 - Röhrenförmige Lampe - Google Patents

Röhrenförmige Lampe Download PDF

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Publication number
EP0217290B1
EP0217290B1 EP19860113203 EP86113203A EP0217290B1 EP 0217290 B1 EP0217290 B1 EP 0217290B1 EP 19860113203 EP19860113203 EP 19860113203 EP 86113203 A EP86113203 A EP 86113203A EP 0217290 B1 EP0217290 B1 EP 0217290B1
Authority
EP
European Patent Office
Prior art keywords
short
filament
filaments
bulb
circuit
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
Application number
EP19860113203
Other languages
English (en)
French (fr)
Other versions
EP0217290A3 (en
EP0217290A2 (de
Inventor
Nobuyoshi C/O Patent Division Toshiba K.K. Hatae
Ippei C/O Patent Division Toshiba K.K. Ban
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.)
Toshiba Corp
Original Assignee
Toshiba 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
Application filed by Toshiba Corp filed Critical Toshiba Corp
Publication of EP0217290A2 publication Critical patent/EP0217290A2/de
Publication of EP0217290A3 publication Critical patent/EP0217290A3/en
Application granted granted Critical
Publication of EP0217290B1 publication Critical patent/EP0217290B1/de
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/02—Incandescent bodies
    • H01K1/04—Incandescent bodies characterised by the material thereof
    • H01K1/08—Metallic bodies
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/18—Mountings or supports for the incandescent body
    • H01K1/24—Mounts for lamps with connections at opposite ends, e.g. for tubular lamp

Definitions

  • This invention relates to a tubular lamp, in particular, to a tubular lamp having plural filaments and short-circuit wires connecting them.
  • tubular halogen lamps for use in copying machines and facsimiles, comprise a tubular bulb, plural coil filaments made of tungsten and disposed in the bulb, and plural short-circuit wires connecting these coil filaments to one another. These coil filaments and short-circuit wires are arranged alternately and in a row along the bulb axis. Within the bulb, an inert gas such as argon and a quantity of halogen are sealed. In this tubular halogen lamp, however, that portion of the coil filament which is connected to the short-circuit wire, represents a weak point in the structure. This gives rise to problems, in that the operation to connect them is complicated and the connection sometimes loosens, generates heat, or becomes disconnected over a long period of use.
  • a short-circuit wire made of molybdenum and having a smaller diameter than that of a coil filament made of tungsten is inserted into one end of the coil filament, and additionally, an end portion of an annular anchor is wound round the insertion portion.
  • the workability is bad in this case, as the anchor, made of hard molybdenum, has to be wound. Further, the wound anchor sometimes loosens due to the resilience, thus making any strong clamping difficult. In some cases, the anchor even falls off, due to a shock or jolt. Then the short-circuit wire is drawn out of the filament, thereby turning off the electric lamp.
  • GB-A-1 177 828 discloses an incandescent lamp in which a connector and a leg portion of a filament are frictionally engaged with each other.
  • a wire is wound around the outer periphery of the connector, thereby forming a thread portion therein.
  • the leg portion is screwed onto the thread portion of the connector, thus coupling the leg portion and the connector with each other.
  • the outer periphery of the connector is cut into a thread shape, thereby to form a thread portion onto which the leg portion is screwed.
  • the present invention provides a tubular loop as defined in claim 1.
  • the tubular lamp according to this invention uses a short-circuit wire which is made of a wire having a lower hardness than that of the metal which forms the coil filament, and which has a larger diameter than the inner diameter of the coil filament.
  • the short-circuit wire is screwed into one end of the filament and is thus connected to it.
  • Figs. 1 through 3 show an embodiment according to this invention, applied to a tubular halogen lamp for use in copying machines.
  • the lamp is provided with a straight tube type bulb 10 made of quartz glass, of which both ends are sealed to form sealed portions 10a.
  • a straight tube type bulb 10 made of quartz glass, of which both ends are sealed to form sealed portions 10a.
  • an introduction foil 12 made of molybdenum.
  • Each foil 12 is connected to inner lead wire 14 and outer lead wire 16, the former extending into bulb 10 and the latter being connected to terminal 18 fixed to the outer surface of portion 10a.
  • Within bulb 10 there are a plurality of coil filaments 20 between two inner lead wires 14. Filaments 20 are arranged in a row along the axis of bulb 10, at regular intervals.
  • a short-circuit wire 22 is provided between adjacent pairs of filaments 20, thereby connecting them in series.
  • filaments 20 and short-circuit wires 22 are arranged alternately in a row within bulb 10.
  • Each short-circuit wire 22 has a pair of anchors 24 made of bending two parts of the wire into a loop. Anchors 24 have a diameter nearly equal to the inner diameter of bulb 10, and so engage with the inner peripheral surface of the bulb.
  • filaments 20 and short-circuit wires 22 are supported by anchors 24, along the axis of bulb 10.
  • a quantity of halogen and an inert gas such as argon, are sealed within bulb 10.
  • filament 20 is formed by winding a tungsten wire into a single coil.
  • Filament 20 has central luminant section 20a and engagement sections 20b located at both ends thereof, and a rough-pitch section 20c is formed between sections 20a and 20b.
  • Coil pitch P 2 of engagement section 20b is set to be larger than coil pitch P, of luminant section 20a.
  • Each short-circuit wire 22 is made by processing a wire material made of a metal having a lower hardness than the tungsten that forms filament 20, and which has a heat resistance such as can resist the heat radiating from the filament; for instance, molybdenum.
  • Diameter d 2 of short-circuit wire 22 is set to be larger than inner diameter d 1 of coil filament 20.
  • Wire 22 has straight insertion portions 22a at both ends thereof and free end 22b of each insertion portion 22a, is tapered. Insertion portion 22a of each short-circuit wire 22 is screwed into engagement section 20b of its adjacent filament 20, thus mechanically and electrically connecting short-circuit wire 22 to filament 20. Insertion portion 22a is inserted into engagement section 20b of filament 20, until the end of its tapered portion 22b reaches rough-pitch section 20c of filament 20.
  • the tubular lamp of this embodiment therefore, even if it is turnedon and off repeatedly or is subjected to vibrations over a long period, there is no fear of the connection between filament 20 and short-circuit wire 22 becoming loose and generating heat, nor of the filament falling off or becoming disconnected. Further, there is no need to provide a special member for connecting the filament to the short-circuit wire, and the connection operation is easily accomplished. Moreover, the axis of filament 20 can be aligned exactly with the axis of short-circuit wire 22, which will enable a highly precise tubular lamp to be obtained.
  • this invention is applicable to not only a tubular halogen lamp for copying machines, but also to other tubular lamps including infrared lamps.
  • Molybdenum is not the only material which can be used for forming the short-circuit wires.
  • Other metals such as tantalum, tungsten alloys, nickel, iron, molybdenum alloys, etc. may be used instead, as long as they have a lower hardness than the metal of the filament, and have good heat resistance.
  • the number of filaments and of short-circuit wires may be changed according to circumstances; the only requirement is that they be arranged alternately.
  • the anchor may be made separately from the short-circuit wire, and may be fixed to the filament instead of the short-circuit wire. Further, the number of anchors may be changed, if necessary, and short-circuit wires without anchors may be provided.
  • the free end of the insertion portion of the short-circuit wire is tapered to facilitate its insertion into the filament's engagement section.
  • a guide projection for the screwing-in of the insertion portion may be provided at the outer periphery thereof, instead of the tapered part.
  • the filament is made by winding the luminant section and the engagement sections at different pitches, but they may be formed by being wound at the same pitch.
  • the winding pitch of the engagement section will increase as the insertion portion of the short-circuit wire is screwed into it.
  • the winding pitch of the engagement section can be equal to or smaller than that of the luminant section.
  • the filament need not have the rough-pitch section. However, when the rough-pitch section is provided, it serves as a measure, indicating the inserted depth of the insertion section 22a, which makes it possible to precisely set up the insertion depth, as well as the length of luminant section 20a, at most desirable values.
  • connection mechanism can apply to the connection of a filament to the inner lead wire.

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  • Resistance Heating (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Claims (5)

1. Röhrenförmige Lampe mit:
einem röhrenförmigen Kolben (10);
einer Vielzahl von gewendelten Fäden (20), die innerhalb des Kolbens (10) entlang einer Achse des Kolbens (10) angeordnet sind, wobei jeder der Fäden (20) in einen vorbestimmten Innendurchmesser gewendelt ist und einen Leuchtabschnitt (20a) sowie an beiden Enden hiervon liegende Eingriffabschnitte (20b) hat;
einer Vielzahl von Kurzschlußdrähten (22), von denen einer zwischen jeweils zwei benachbarten Fäden (20) liegt und diese miteinander verbindet; wobei:
jeder der Kurzschlußdrähte (22) einen größeren Durchmesser (d2) als den Innendurchmesser (d1) der gewendelten Fäden (20) und einen Einführteil (22a), der in den Eingriffäbschnitt (20b) des Fadens (20) geschraubt ist, um den Kurzschlußdraht (22) mit dem Faden (20) zu verbinden, hat; und
jeder der Kurzschlußdrähte (22) eine niedrigere Härte als die Fäden (20) hat, so daß der Faden (20) in die Außenfläche des Einführteiles (22a) eindringt, um eine Rille zu bilden, und in die in dem Einführteil (22a) gebildete Rille paßt, wenn der Einführteil (22a) in den Eingriffabschnitt (20b) geschraubt ist.
2. Röhrenförmige Lampe nach Anspruch 1, dadurch gekennzeichnet, daß der Durchmesser des Kurzschlußdrahtes (22) so eingestellt ist, daß er etwa 0,01 bis 0,03 mm größer als der Innendurchmesser (d1) des gewendelten Fadens (20) ist.
3. Röhrenförmige Lampe nach Anspruch 1, dadurch gekennzeichnet, daß jeder der Fäden (20) aus Wolfram hergestellt ist und jeder der Kurzschlußdrähte (22) aus Molybdän hergestellt ist.
4. Röhrenförmige Lampe nach Anspruch 1, dadurch gekennzeichnet, daß der Einführteil (22a) des Kurzschlußdrahtes (22) ein konisches freies Ende (22b) hat.
5. Röhrenförmige Lampe nach Anspruch 1, gekennzeichnet durch eine Vielzahl von ringförmigen Verankerungen (24), die in dem Kolben (10) und in Eingriff mit der Innenmantelfläche des Kolbens zum Lagern der Fäden (20) und Kurzschlußdrähte (22) entläng der Achse des Kolbens angeordnet sind, wobei jede der Verankerungen durch Biegen eines Teiles des entsperchenden Kurzschlußdrahtes gebildet ist.
EP19860113203 1985-09-30 1986-09-25 Röhrenförmige Lampe Expired EP0217290B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP14813985U JPS6257369U (de) 1985-09-30 1985-09-30
JP148139/85 1985-09-30

Publications (3)

Publication Number Publication Date
EP0217290A2 EP0217290A2 (de) 1987-04-08
EP0217290A3 EP0217290A3 (en) 1988-11-09
EP0217290B1 true EP0217290B1 (de) 1990-08-29

Family

ID=15446140

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860113203 Expired EP0217290B1 (de) 1985-09-30 1986-09-25 Röhrenförmige Lampe

Country Status (3)

Country Link
EP (1) EP0217290B1 (de)
JP (1) JPS6257369U (de)
DE (1) DE3673738D1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4942331A (en) * 1989-05-09 1990-07-17 General Electric Company Filament alignment spud for incandescent lamps
US5079475A (en) * 1989-12-01 1992-01-07 U.S. Philips Corporation Electric incandescent lamp having a looped filament support member
JP2016207499A (ja) * 2015-04-23 2016-12-08 東芝ライテック株式会社 ハロゲンヒータ

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3416024A (en) * 1966-05-31 1968-12-10 Gen Electric Differential output incandescent lamp
US3943395A (en) * 1974-12-06 1976-03-09 Gte Sylvania Incorporated Tubular incandescent lamp having spaced segments
US4185219A (en) * 1977-07-04 1980-01-22 Tokyo Shibaura Denki Kabushiki Kaisha Tubular incandescent lamp
US4272698A (en) * 1978-12-01 1981-06-09 Ushio Denki Kabushikikaisha Tubular incandescent lamp
US4442374A (en) * 1982-03-25 1984-04-10 Gte Products Corporation Dual length copier lamp

Also Published As

Publication number Publication date
DE3673738D1 (de) 1990-10-04
EP0217290A3 (en) 1988-11-09
JPS6257369U (de) 1987-04-09
EP0217290A2 (de) 1987-04-08

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