JPS5491972A - Filament coil for lamp bulb - Google Patents

Filament coil for lamp bulb

Info

Publication number
JPS5491972A
JPS5491972A JP16053277A JP16053277A JPS5491972A JP S5491972 A JPS5491972 A JP S5491972A JP 16053277 A JP16053277 A JP 16053277A JP 16053277 A JP16053277 A JP 16053277A JP S5491972 A JPS5491972 A JP S5491972A
Authority
JP
Japan
Prior art keywords
coil
pressed
wire
movement
filament 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.)
Granted
Application number
JP16053277A
Other languages
Japanese (ja)
Other versions
JPS5837943B2 (en
Inventor
Shokichi Noda
Takao Takeda
Kohei Sakayama
Hiroshi Ito
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP16053277A priority Critical patent/JPS5837943B2/en
Publication of JPS5491972A publication Critical patent/JPS5491972A/en
Publication of JPS5837943B2 publication Critical patent/JPS5837943B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Discharge Lamp (AREA)

Abstract

PURPOSE: To prevent the movement of a core wire and the entanglement of filament coils by reducing the diameter of a filament coil at the cut ends, compared to that at central portion, by passing.
CONSTITUTION: To prevent the movement of a thin tungsten wire 4, the friction between the wire 4 and a core wire 2 of a coiled coil 7 is enhanced. This is effected by pressing the end portion 10 of the coil in such manner as to make tapers from the central portion 11 toward cut ends 8. The pressed portions 10 should have taper shape because if they are pressed uniformly the pressed-nonpressed boundary portions are subjected to a severe mechanical deformation.
COPYRIGHT: (C)1979,JPO&Japio
JP16053277A 1977-12-28 1977-12-28 Filament coil for tubes Expired JPS5837943B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16053277A JPS5837943B2 (en) 1977-12-28 1977-12-28 Filament coil for tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16053277A JPS5837943B2 (en) 1977-12-28 1977-12-28 Filament coil for tubes

Publications (2)

Publication Number Publication Date
JPS5491972A true JPS5491972A (en) 1979-07-20
JPS5837943B2 JPS5837943B2 (en) 1983-08-19

Family

ID=15716995

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16053277A Expired JPS5837943B2 (en) 1977-12-28 1977-12-28 Filament coil for tubes

Country Status (1)

Country Link
JP (1) JPS5837943B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6817920B1 (en) 1999-10-20 2004-11-16 Matsushita Electric Industrial Co., Ltd. Discharge lamp having an electrode with suppression of end portion deformation, discharge lamp electrode and method for producing same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6817920B1 (en) 1999-10-20 2004-11-16 Matsushita Electric Industrial Co., Ltd. Discharge lamp having an electrode with suppression of end portion deformation, discharge lamp electrode and method for producing same

Also Published As

Publication number Publication date
JPS5837943B2 (en) 1983-08-19

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