JPS5550544A - Method for manufacturing tungsten filament - Google Patents
Method for manufacturing tungsten filamentInfo
- Publication number
- JPS5550544A JPS5550544A JP12478578A JP12478578A JPS5550544A JP S5550544 A JPS5550544 A JP S5550544A JP 12478578 A JP12478578 A JP 12478578A JP 12478578 A JP12478578 A JP 12478578A JP S5550544 A JPS5550544 A JP S5550544A
- Authority
- JP
- Japan
- Prior art keywords
- filament
- container
- heating treatment
- during
- carrying
- 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.)
- Pending
Links
Abstract
PURPOSE: To eliminate a deformation of the filament during the heating treatment and a breakage thereof during the connection process with leads, by carrying out the heating treatment for the filament with filament portions to be connected to internal leads being insulated from heat, and carrying out secondary recrystallization process for the light emitting portion of the filament.
CONSTITUTION: A tungsten filament with core is received in a container, which is made of an electrically conductive material such as high-melting-point tungsten, so that the portions to be connected to internal leads are positioned outside of the container, then the tungsten container is heated in a reducing atmosphere by an electric current, infrared rays, or high-frequency electromagnetic field, etc., to carry out indirect heating treatment through the container wall for the light emitting portion located in the container to form the filament. By carrying out the heating treatment for achieving secondary recrystallization process in this manner, the degree of deformation freedom is decreased, and the deformation during the heating treatment and the breakage during the connection process with the internal leads can be eliminated.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12478578A JPS5550544A (en) | 1978-10-11 | 1978-10-11 | Method for manufacturing tungsten filament |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12478578A JPS5550544A (en) | 1978-10-11 | 1978-10-11 | Method for manufacturing tungsten filament |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5550544A true JPS5550544A (en) | 1980-04-12 |
Family
ID=14894054
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12478578A Pending JPS5550544A (en) | 1978-10-11 | 1978-10-11 | Method for manufacturing tungsten filament |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5550544A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6394062A (en) * | 1986-10-08 | 1988-04-25 | Toyota Motor Corp | Exhaust gas recirculation controller for diesel engine |
-
1978
- 1978-10-11 JP JP12478578A patent/JPS5550544A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6394062A (en) * | 1986-10-08 | 1988-04-25 | Toyota Motor Corp | Exhaust gas recirculation controller for diesel engine |
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