EP0162673A3 - Improvements in tungsten halogen incandescent lamps - Google Patents

Improvements in tungsten halogen incandescent lamps Download PDF

Info

Publication number
EP0162673A3
EP0162673A3 EP85303466A EP85303466A EP0162673A3 EP 0162673 A3 EP0162673 A3 EP 0162673A3 EP 85303466 A EP85303466 A EP 85303466A EP 85303466 A EP85303466 A EP 85303466A EP 0162673 A3 EP0162673 A3 EP 0162673A3
Authority
EP
European Patent Office
Prior art keywords
shield
tungsten halogen
halogen incandescent
molybdenum
incandescent lamps
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Withdrawn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
EP85303466A
Other languages
German (de)
French (fr)
Other versions
EP0162673A2 (en
Inventor
Clive Arthur Evander Underwood
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.)
Thorn EMI PLC
Original Assignee
Thorn EMI PLC
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 Thorn EMI PLC filed Critical Thorn EMI PLC
Publication of EP0162673A2 publication Critical patent/EP0162673A2/en
Publication of EP0162673A3 publication Critical patent/EP0162673A3/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K9/00—Lamps having two or more incandescent bodies separately heated
    • H01K9/08—Lamps having two or more incandescent bodies separately heated to provide selectively different light effects, e.g. for automobile headlamp
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/52—Means for obtaining or maintaining the desired pressure within the vessel
    • H01K1/54—Means for absorbing or absorbing gas, or for preventing or removing efflorescence, e.g. by gettering
    • H01K1/56—Means for absorbing or absorbing gas, or for preventing or removing efflorescence, e.g. by gettering characterised by the material of the getter

Landscapes

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

Abstract

A tungsten halogen incandescent lamp having a filament support structure made of molybdenum and a filament shield, also of molybdenum, to provide an assymetric pass­ ing beam in an automobile headlight. When operating with the halogen bromine small changes in the design or posi­ tioning of the shield can be critical and can cause darkening. This can be prevented by applying a small amount of the metal platinum to the back of the shield by plating, by means of a paste or in any convenient manner. In a specific example 13 microgrammes of platinum were used in a 55-60W H4 automobile headlight having a fill of bromine and krypton.
EP85303466A 1984-05-19 1985-05-17 Improvements in tungsten halogen incandescent lamps Withdrawn EP0162673A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8412842 1984-05-19
GB848412842A GB8412842D0 (en) 1984-05-19 1984-05-19 Tungsten halogen incandescent lamps

Publications (2)

Publication Number Publication Date
EP0162673A2 EP0162673A2 (en) 1985-11-27
EP0162673A3 true EP0162673A3 (en) 1987-04-22

Family

ID=10561207

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85303466A Withdrawn EP0162673A3 (en) 1984-05-19 1985-05-17 Improvements in tungsten halogen incandescent lamps

Country Status (3)

Country Link
EP (1) EP0162673A3 (en)
JP (1) JPS60254552A (en)
GB (1) GB8412842D0 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3926832A (en) * 1972-08-10 1975-12-16 Getters Spa Gettering structure
US4305017A (en) * 1979-12-14 1981-12-08 U.S. Philips Corporation Halogen incandescent lamp

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3926832A (en) * 1972-08-10 1975-12-16 Getters Spa Gettering structure
US3926832B1 (en) * 1972-08-10 1984-12-18
US4305017A (en) * 1979-12-14 1981-12-08 U.S. Philips Corporation Halogen incandescent lamp

Also Published As

Publication number Publication date
GB8412842D0 (en) 1984-06-27
EP0162673A2 (en) 1985-11-27
JPS60254552A (en) 1985-12-16

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18W Application withdrawn

Withdrawal date: 19870414

RIN1 Information on inventor provided before grant (corrected)

Inventor name: UNDERWOOD, CLIVE ARTHUR EVANDER