EP0108449B1 - Electric lamp - Google Patents

Electric lamp Download PDF

Info

Publication number
EP0108449B1
EP0108449B1 EP19830201546 EP83201546A EP0108449B1 EP 0108449 B1 EP0108449 B1 EP 0108449B1 EP 19830201546 EP19830201546 EP 19830201546 EP 83201546 A EP83201546 A EP 83201546A EP 0108449 B1 EP0108449 B1 EP 0108449B1
Authority
EP
European Patent Office
Prior art keywords
lamp
fuse
current
cement
tube
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
EP19830201546
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0108449A1 (en
Inventor
Victor Rosallie Notelteirs
Eduard Josef Philomena Janssen
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of EP0108449A1 publication Critical patent/EP0108449A1/en
Application granted granted Critical
Publication of EP0108449B1 publication Critical patent/EP0108449B1/en
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J7/00—Details not provided for in the preceding groups and common to two or more basic types of discharge tubes or lamps
    • H01J7/44—One or more circuit elements structurally associated with the tube or lamp
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/62—One or more circuit elements structurally associated with the lamp
    • H01K1/66—One or more circuit elements structurally associated with the lamp with built-in fuse

Definitions

  • the invention relates to an electric lamp provided with a lamp envelope which is sealed in a vacuum-tight manner and which is secured at one end to a lamp cap, current-supply conductors extending from contacts on the lamp cap through the wall of the lamp envelope to a light source arranged inside the lamp envelope and a fuse being included in at least one of the current-supply conductors inside the space limited by the wall of the lamp envelope and the lamp cap, which fuse is located inside a closed tube of electrically insulating material filled with an electrically insulating material.
  • Such an electric lamp is known from the British Patent Specification 830,360.
  • the fuse is included in a glass tube which is filled with glass pellets or sand and which is fused at its end with the current-supply conductor.
  • the fuse is reliable and safe, but is expensive due to the two fusions.
  • the invention has for its object to provide a lamp which incorporates a reliable and safe fuse of a simple and inexpensive construction.
  • this is achieved in a lamp of the kind mentioned in the preamble in that the tube is closed at its ends onto the current-supply conductor by means of a cement suitable for lamps.
  • the lamp according to the invention can be manufactured in a simpler and cheaper manner in that, before the lamp cap is mounted on the lamp envelope, a tube, for example, of glass or ceramic material, is slid over the current-supply conductor until it surrounds the fuse and the tube is filled with electrically insulating material and is closed at its end onto the current-supply conductor by providing a cement suitable for lamps.
  • a tube for example, of glass or ceramic material
  • the cement used consists of cement suitable for securing lamp caps to lamp envelopes. Examples that can be mentioned are mixtures of talcum powder, zinc oxide and potassium silicate as well as mixtures of quartz powder, sodium silicofluoride and sodium silicate.
  • the tube can be filled between its ends with glass powder, glass pellets, sand and the like.
  • the tube is filled with the same cement as that with which it is closed at its ends.
  • the insulating mass need be provided only very locally to enclose the fuse on all sides.
  • the mass can be provided before the lamp cap is fitted so that the fuse can be enclosed completely in a controlled manner. Due to the fact that the fuse is embedded in an insulating mass, generally no discharge arc is formed during melting of the fuse. In cases in which an arc is formed as yet, it remains inside the tube and extinguishes rapidly.
  • the construction of the lamp according to the invention is particularly suitable for heavily loaded lamps, such as halogen mains voltage lamps of high power, but the construction may also be used in other halogen lamps and in lamps which have as a light source both a filament and a discharge arc, for example, a high-pressure mercury vapour discharge arc, the filament acting at the same time as a current limiter.
  • FIG. 1 An embodiment of a lamp according to the invention is shown in the drawing, the lamp envelope being shown in side elevation and the lamp cap in longitudinal sectional view.
  • the lamp envelope 1 is closed at one end by a pinch 5 and is secured by means of cement 6 to a lamp cap 7.
  • Current-supply conductors 2 and 3 extend from contacts 11 on the lamp cap 7 through the wall of the tamp envelope 1 to a filament 4 arranged as a light source inside this envelope.
  • the lamp cap 7 has a ceramic moulding 8 which is fixed in a metal sheath 9.
  • a fuse wire 10 is included in the current-supply conductor 3, which fuse wire is located inside a tube 13 of electrically insulating material (in the drawing, glass), which tube 13 is closed at its ends onto the current-supply conductor 3 and is filled between its ends with a cement suitable for lamps 14.
  • said cement 14 is identical with the cement 6 and consists mainly of quartz powder, zinc oxide and sodium silicate.
  • the lamp shown is a halogen incandescent lamp with a gas filling consisting of krypton and methylene bromide.
  • the lamp When it is operated at 225 V, the lamp consumes a power of 150 W and is intended to be used as a projection lamp.
  • the lamp was operated at normal voltage and was then loaded with an overvoltage of 60%.
  • the fuse interrupted the current through the lamp 5 msec after the overvoltage was applied. Apart from the fuse wire 10 and the filament 4, the lamp was still completely intact.

Landscapes

  • Discharge Lamps And Accessories Thereof (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
EP19830201546 1982-11-02 1983-10-28 Electric lamp Expired EP0108449B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8204237 1982-11-02
NL8204237 1982-11-02

Publications (2)

Publication Number Publication Date
EP0108449A1 EP0108449A1 (en) 1984-05-16
EP0108449B1 true EP0108449B1 (en) 1989-01-18

Family

ID=19840509

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830201546 Expired EP0108449B1 (en) 1982-11-02 1983-10-28 Electric lamp

Country Status (5)

Country Link
EP (1) EP0108449B1 (enrdf_load_stackoverflow)
JP (1) JPS5969477U (enrdf_load_stackoverflow)
CA (1) CA1214202A (enrdf_load_stackoverflow)
DE (1) DE3379007D1 (enrdf_load_stackoverflow)
HU (1) HU186812B (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6639364B1 (en) 2000-06-29 2003-10-28 Koninklijke Philips Electronics N.V. Halogen incandescent capsule having filament leg clamped in press seal
CN110265284B (zh) * 2013-03-15 2021-11-05 应用材料公司 简化的灯具设计
KR102058012B1 (ko) * 2013-12-19 2020-01-22 어플라이드 머티어리얼스, 인코포레이티드 교체가능한 램프를 위한 어댑터

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB830360A (en) 1957-04-01 1960-03-16 Crompton Parkinson Ltd Improvements relating to electric lamps and similar enclosed devices
US3727091A (en) * 1971-05-11 1973-04-10 Westinghouse Electric Corp Halogen-cycle incandescent lamp having a platinized interior fuse

Also Published As

Publication number Publication date
HU186812B (en) 1985-09-30
CA1214202A (en) 1986-11-18
DE3379007D1 (en) 1989-02-23
JPS6330117Y2 (enrdf_load_stackoverflow) 1988-08-12
JPS5969477U (ja) 1984-05-11
EP0108449A1 (en) 1984-05-16

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