EP0280475A2 - Kolben mit Restbeleuchtung beim Durchbrennen des Leuchtdrahtes - Google Patents

Kolben mit Restbeleuchtung beim Durchbrennen des Leuchtdrahtes Download PDF

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Publication number
EP0280475A2
EP0280475A2 EP19880301412 EP88301412A EP0280475A2 EP 0280475 A2 EP0280475 A2 EP 0280475A2 EP 19880301412 EP19880301412 EP 19880301412 EP 88301412 A EP88301412 A EP 88301412A EP 0280475 A2 EP0280475 A2 EP 0280475A2
Authority
EP
European Patent Office
Prior art keywords
filament
filaments
lamp
life
parallel
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Withdrawn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
EP19880301412
Other languages
English (en)
French (fr)
Inventor
Tai-Her Yang
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0280475A2 publication Critical patent/EP0280475A2/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K9/00—Lamps having two or more incandescent bodies separately heated
    • H01K9/02—Lamps having two or more incandescent bodies separately heated to provide substitution in the event of failure of one of the bodies

Definitions

  • Electric filament lamps have a limited lifetime before they fail by rupture of the filament.
  • the lifetime of the lamp depends largely on the filament itself. In particular on such factors as its length, cross-sectional area, coiling pitch and the composition of the wire from which it is made. Lamps for use in general service are usually designed to have a burning lifetime of one thousand hours.
  • Patent GB426477 It has been proposed in Patent GB426477 to provide a lamp in which the filament is electrically divided into parts so that the burning out of one part does not cause entire cessation of current through the other or others and the lamp continues to burn, although with reduced intensity.
  • the filament part should be in any way different from one another so that they will have the same expected lifetime and it is highly probable that when failure occurs they will burn out in rapid succession.
  • the present invention as defined in the claims appended hereto provides that one of the filaments is so designed as to burn out before the other or others so that in general there will be an extended period during which the lamp will continue to glow at a reduced intensity, thus avoiding the danger of plunging an area into sudden darkness but giving an indication that the lamp requires prompt replacement.
  • figure 1 is a part-sectional view of a lamp according to the invention and figures 1-1 and 1-2 are diagrams illustrating constructions of filaments for such a lamp.
  • FIG. 1 is a part-sectional and diagrammatic view of a lamp according to the invention.
  • the lamp has an end cap which may be of the Edison screw type having a screw thread 101 and an end contact 110 or may be of the bayonnet type and on which is mounted a bulb 102 containing the filament and its supports.
  • a central support 103 carries a post 104 and a pair of electrodes 105 for leading current into and out of the filaments.
  • the post 104 which is of glass has fused into it a pair of pigtail supports 106, 107 for supporting the filaments 108, 109 midway between their electrodes 105.
  • the two filaments 108, 109 are electrically in parallel between the electrodes 105 and are slightly dissimilar being made of wire of slightly different diameter length and coiling pitch. They are designed so that one of them 108 has a standard expected burning lifetime of approximately one thousand hours, whereas the other 109 is designed to a longer life, for example one thousand, five hundred hours.
  • the filament 108 When the lamp ultimately fails at the end of its life, the filament 108 will fail first, leaving the second filament 109 still functioning although, of course, giving out light at a much lower level than when both filaments were simultaneously effective.

Landscapes

  • Discharge Lamp (AREA)
EP19880301412 1987-02-24 1988-02-19 Kolben mit Restbeleuchtung beim Durchbrennen des Leuchtdrahtes Withdrawn EP0280475A2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB878704263A GB8704263D0 (en) 1987-02-24 1987-02-24 Bulb
GB8704263 1987-02-24

Publications (1)

Publication Number Publication Date
EP0280475A2 true EP0280475A2 (de) 1988-08-31

Family

ID=10612810

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880301412 Withdrawn EP0280475A2 (de) 1987-02-24 1988-02-19 Kolben mit Restbeleuchtung beim Durchbrennen des Leuchtdrahtes

Country Status (2)

Country Link
EP (1) EP0280475A2 (de)
GB (1) GB8704263D0 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6774546B2 (en) * 2002-05-15 2004-08-10 James W Gibboney, Jr. Multiple, parallel filament lamp
GB2406231A (en) * 2003-09-16 2005-03-23 Liam Mcenteggart Light bulb with additional light source

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6774546B2 (en) * 2002-05-15 2004-08-10 James W Gibboney, Jr. Multiple, parallel filament lamp
GB2406231A (en) * 2003-09-16 2005-03-23 Liam Mcenteggart Light bulb with additional light source

Also Published As

Publication number Publication date
GB8704263D0 (en) 1987-04-01

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19900214