EP1102310A1 - Montage d'un filament pour une lampe à incandescence comprenant des bouchons d'extrémité visés et sa méthode de fabrication - Google Patents

Montage d'un filament pour une lampe à incandescence comprenant des bouchons d'extrémité visés et sa méthode de fabrication Download PDF

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Publication number
EP1102310A1
EP1102310A1 EP00310247A EP00310247A EP1102310A1 EP 1102310 A1 EP1102310 A1 EP 1102310A1 EP 00310247 A EP00310247 A EP 00310247A EP 00310247 A EP00310247 A EP 00310247A EP 1102310 A1 EP1102310 A1 EP 1102310A1
Authority
EP
European Patent Office
Prior art keywords
filament
section
pitch
plug
coil
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.)
Withdrawn
Application number
EP00310247A
Other languages
German (de)
English (en)
Inventor
Andrew Davies
Joan Sarson
Anthony John Perrin
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
Publication of EP1102310A1 publication Critical patent/EP1102310A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/18—Mountings or supports for the incandescent body
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/02—Incandescent bodies
    • H01K1/14—Incandescent bodies characterised by the shape
    • 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
    • H01K3/06—Attaching of incandescent bodies to mount

Definitions

  • This invention relates to a screw-in end plug for use in the filament assembly of an incandescent lamp.
  • screw-in end plugs are commonplace in tungsten halogen lamp manufacture.
  • the plugs are short sections of wound tungsten which screw in to the ends of a filament, providing a link between the active filament and the current lead. They are used routinely in monoplane, biplane and other multi-limb studio halogen filaments such as those made by GE Lighting.
  • the level up to which the plug is screwed is important, since this will determine the active (or lit) length of filament wire in the assembly. This needs to be as closely controlled as possible since it is one of the major input variables which determines the primary lamp performance parameters (power consumption, light output, colour temperature, life etc.). Typically, this dimension is given a tolerance of ⁇ 0.3mm, yet during assembly is controlled visually by judgement with the naked eye, hence is prone to error and demands a very high skill level.
  • Another important variable is the length of the end plug which is exposed below the filament. This needs to be controlled to typically ⁇ 0.5mm to ensure that the filament fits the filament support bridge consistently with the correct amount of tension. At present, the length of exposed plug is determined by trimming with wire cutters, again using the naked eye to judge the trimming point.
  • This invention enables each of the above problems to be addressed.
  • a filament assembly for an incandescent lamp including a helically coiled filament and a helically coiled end plug engaging an end of the filament, the end plug comprising a coil having a first section with a diameter and pitch adapted to engage in the end of the filament coil, and a second section having a pitch different from the pitch of the first section.
  • the invention also provides a method of assembling a filament assembly in accordance with the preceding paragraph, comprising screwing the first section of the filament plug into the end of the filament until a resistance is encountered as a result of the difference in pitch between the first and second sections of the end plug.
  • the end plug comprises a helical coil of wire, which differs from any existing plugs in that it comprises sections having at least two different pitches.
  • Fig 1 shows an example of a screw-in end plug 10 which consists of a helical coil of wire, typically of tungsten, with a first section 11 have a first, relatively closely wound, pitch, and a second section 12 having a second, less closely wound pitch.
  • the first and second sections are conveniently of the same diameter, but may be of different diameters.
  • the screw-in end plug 10 is used, as shown in Fig 2, to mount a filament 13 on a current lead 14.
  • the first section 11 of the end plug has a pitch which enables the plug to screw into the end section of a given helical filament
  • the second section 12 has a pitch which prevents the plug from being screwed beyond a pre-determined length inside the end of the filament 13.
  • the pitch of the second section of the plug is such that it can be mounted onto the current lead wire 14 which may be bent up to an angle of more than 60 degrees.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Resistance Heating (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
EP00310247A 1999-11-19 2000-11-17 Montage d'un filament pour une lampe à incandescence comprenant des bouchons d'extrémité visés et sa méthode de fabrication Withdrawn EP1102310A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9927728 1999-11-19
GB9927728A GB2356488A (en) 1999-11-19 1999-11-19 Screw-in end plugs for lamp filaments

Publications (1)

Publication Number Publication Date
EP1102310A1 true EP1102310A1 (fr) 2001-05-23

Family

ID=10865026

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00310247A Withdrawn EP1102310A1 (fr) 1999-11-19 2000-11-17 Montage d'un filament pour une lampe à incandescence comprenant des bouchons d'extrémité visés et sa méthode de fabrication

Country Status (3)

Country Link
EP (1) EP1102310A1 (fr)
JP (1) JP2001196030A (fr)
GB (1) GB2356488A (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3535577A (en) * 1966-11-30 1970-10-20 Philips Corp Tubular electric incandescent lamp with filament and current supply wires spaced from tube walls
GB1340778A (en) * 1971-12-02 1974-01-30 Thorn Electrical Ind Ltd Filament assejbly for incandescent lamps
US4812710A (en) * 1986-03-24 1989-03-14 Patent Treuhand Gesellschaft Fur Elektrische Gluhlampen Mbh Halogen incandescent lamp with high reliability filament connection, and method of manufacture
EP0438254A2 (fr) * 1990-01-16 1991-07-24 Ge Lighting Limited Lampe circulaire de chauffage
GB2305585A (en) * 1995-03-09 1997-04-09 Ge Lighting Ltd Heat source
RU2139160C1 (ru) * 1998-06-24 1999-10-10 Мордовский государственный университет им.Н.П.Огарева Устройство для резки тел накала для источников света
JP2000106150A (ja) * 1998-09-28 2000-04-11 Ushio Inc 白熱ランプ

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3535577A (en) * 1966-11-30 1970-10-20 Philips Corp Tubular electric incandescent lamp with filament and current supply wires spaced from tube walls
GB1340778A (en) * 1971-12-02 1974-01-30 Thorn Electrical Ind Ltd Filament assejbly for incandescent lamps
US4812710A (en) * 1986-03-24 1989-03-14 Patent Treuhand Gesellschaft Fur Elektrische Gluhlampen Mbh Halogen incandescent lamp with high reliability filament connection, and method of manufacture
EP0438254A2 (fr) * 1990-01-16 1991-07-24 Ge Lighting Limited Lampe circulaire de chauffage
GB2305585A (en) * 1995-03-09 1997-04-09 Ge Lighting Ltd Heat source
RU2139160C1 (ru) * 1998-06-24 1999-10-10 Мордовский государственный университет им.Н.П.Огарева Устройство для резки тел накала для источников света
JP2000106150A (ja) * 1998-09-28 2000-04-11 Ushio Inc 白熱ランプ

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section PQ Week 200039, Derwent World Patents Index; Class P52, AN 2000-450115, XP002160585 *
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 07 29 September 2000 (2000-09-29) *

Also Published As

Publication number Publication date
GB9927728D0 (en) 2000-01-26
JP2001196030A (ja) 2001-07-19
GB2356488A (en) 2001-05-23

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