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EP0271859A3 - Compact coiled coil incandescent filament using pitch for sag control - Google Patents

Compact coiled coil incandescent filament using pitch for sag control Download PDF

Info

Publication number
EP0271859A3
EP0271859A3 EP87118491A EP87118491A EP0271859A3 EP 0271859 A3 EP0271859 A3 EP 0271859A3 EP 87118491 A EP87118491 A EP 87118491A EP 87118491 A EP87118491 A EP 87118491A EP 0271859 A3 EP0271859 A3 EP 0271859A3
Authority
EP
European Patent Office
Prior art keywords
filament
compact
pitch
coiled coil
incandescent filament
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.)
Granted
Application number
EP87118491A
Other languages
German (de)
French (fr)
Other versions
EP0271859B1 (en
EP0271859A2 (en
Inventor
Pierce Johnson, Jr.
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.)
Osram Sylvania Inc
Original Assignee
GTE Products 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 GTE Products Corp filed Critical GTE Products Corp
Publication of EP0271859A2 publication Critical patent/EP0271859A2/en
Publication of EP0271859A3 publication Critical patent/EP0271859A3/en
Application granted granted Critical
Publication of EP0271859B1 publication Critical patent/EP0271859B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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

Landscapes

  • Resistance Heating (AREA)

Abstract

This invention provides an improved compact fine wire incandescent lamp filament and method for making the same. The filament has a primary mandrel ratio in the range of about 1.40 to about 3.00 and a secondary mandrel ratio which in the range of about 3.0 to about 10.0.
The improved filament design exhibits an increase in compactness and retains or increases structural rigidity while exhibiting minimal sag when the filament is incorporated into an incandescent lamp of the tungsten halogen type variety.
The compact coiling method is particularly useful in designing compact filaments for high voltage applications where it is desirable to eliminate the use of rectifying means to lower the effective voltage across the filament.
EP87118491A 1986-12-16 1987-12-14 Compact coiled coil incandescent filament using pitch for sag control Expired - Lifetime EP0271859B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US94233286A 1986-12-16 1986-12-16
US942332 1986-12-16

Publications (3)

Publication Number Publication Date
EP0271859A2 EP0271859A2 (en) 1988-06-22
EP0271859A3 true EP0271859A3 (en) 1990-05-09
EP0271859B1 EP0271859B1 (en) 1997-04-02

Family

ID=25477937

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87118491A Expired - Lifetime EP0271859B1 (en) 1986-12-16 1987-12-14 Compact coiled coil incandescent filament using pitch for sag control

Country Status (2)

Country Link
EP (1) EP0271859B1 (en)
DE (1) DE3752040T2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7932665B2 (en) 2008-12-02 2011-04-26 Osram Sylvania Inc. Dual filament lamp for rapid temperature processing

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2034540A (en) * 1934-07-18 1936-03-17 Gen Electric Manufacture of coiled coil or double helical filaments
US2359302A (en) * 1942-06-11 1944-10-03 Tung Sol Lamp Works Inc Incandescent lamp and method of manufacture
US3383539A (en) * 1967-02-06 1968-05-14 Sylvania Electric Prod Projection lamp
US4012659A (en) * 1975-12-31 1977-03-15 Gte Sylvania Incorporated Method of flashing tungsten filament
GB2065966A (en) * 1979-12-19 1981-07-01 Gen Electric Triple-coil incadescent filament
GB2135820A (en) * 1983-02-25 1984-09-05 Gte Prod Corp Electric lamp with high outer-envelope to inner-envelope wall-thickness ratio
FR2550383A1 (en) * 1983-08-01 1985-02-08 Gen Electric HIGH EFFICIENCY INCANDESCENT LIGHTING DEVICE
US4499401A (en) * 1983-03-03 1985-02-12 General Electric Company Triple coil incandescent filament
US4686412A (en) * 1986-04-14 1987-08-11 Gte Products Corporation Reflector-type lamp having reduced focus loss

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1147140A (en) * 1967-03-10 1969-04-02 Sylvania Electric Prod Incandescent lamp

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2034540A (en) * 1934-07-18 1936-03-17 Gen Electric Manufacture of coiled coil or double helical filaments
US2359302A (en) * 1942-06-11 1944-10-03 Tung Sol Lamp Works Inc Incandescent lamp and method of manufacture
US3383539A (en) * 1967-02-06 1968-05-14 Sylvania Electric Prod Projection lamp
US4012659A (en) * 1975-12-31 1977-03-15 Gte Sylvania Incorporated Method of flashing tungsten filament
GB2065966A (en) * 1979-12-19 1981-07-01 Gen Electric Triple-coil incadescent filament
GB2135820A (en) * 1983-02-25 1984-09-05 Gte Prod Corp Electric lamp with high outer-envelope to inner-envelope wall-thickness ratio
US4499401A (en) * 1983-03-03 1985-02-12 General Electric Company Triple coil incandescent filament
FR2550383A1 (en) * 1983-08-01 1985-02-08 Gen Electric HIGH EFFICIENCY INCANDESCENT LIGHTING DEVICE
US4686412A (en) * 1986-04-14 1987-08-11 Gte Products Corporation Reflector-type lamp having reduced focus loss

Also Published As

Publication number Publication date
DE3752040D1 (en) 1997-05-07
DE3752040T2 (en) 1997-10-30
EP0271859B1 (en) 1997-04-02
EP0271859A2 (en) 1988-06-22

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