JPS579032A - Manufacture of cathode for cathode-ray tube - Google Patents
Manufacture of cathode for cathode-ray tubeInfo
- Publication number
- JPS579032A JPS579032A JP8282380A JP8282380A JPS579032A JP S579032 A JPS579032 A JP S579032A JP 8282380 A JP8282380 A JP 8282380A JP 8282380 A JP8282380 A JP 8282380A JP S579032 A JPS579032 A JP S579032A
- Authority
- JP
- Japan
- Prior art keywords
- cathode
- heater
- insulating layer
- coil
- solution
- 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
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/02—Manufacture of electrodes or electrode systems
- H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Electrodes For Cathode-Ray Tubes (AREA)
Abstract
PURPOSE:To make a cathode for a cathode-ray tube small, enable realization of a sufficient breakdown strength of the cathode, and enhance the tube characteristic by forming several insulating layers on the surface of a heater, and forming the first insulating layer made of Al by vapor deposition before the Al deposited on the heater is subjected to anodic oxidation. CONSTITUTION:Al is deposited on the surface of a coil 21 by vapor deposition. The coil 21 coated with Al is put in a solution of, for example, oxalic acid or sulfuric acid, and current is made to flow in the solution by using the heater as an anode so as to make the former Al to be oxidized, thereby a first insulating layer 22 touching the surface of the heater being formed. After that, the coil 21 is taken out of the solution, and a second insulating layer 23 made of a pulverized Al2O3+W powder and a third insulating layer 24 made of pulverized Al2O3 powder are formed over the first layer 22 by a spray method or the like. By the means mentioned above, the insulating layers can be made thin, a sufficient breakdown strength of a cathode can be achieved, and the tube characteristic can be enhanced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8282380A JPS579032A (en) | 1980-06-20 | 1980-06-20 | Manufacture of cathode for cathode-ray tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8282380A JPS579032A (en) | 1980-06-20 | 1980-06-20 | Manufacture of cathode for cathode-ray tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS579032A true JPS579032A (en) | 1982-01-18 |
Family
ID=13785115
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8282380A Pending JPS579032A (en) | 1980-06-20 | 1980-06-20 | Manufacture of cathode for cathode-ray tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS579032A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990027741A (en) * | 1997-09-30 | 1999-04-15 | 김영남 | Cathode structure for electron gun |
| KR20000013376A (en) * | 1998-08-07 | 2000-03-06 | 구자홍 | The cathode structure for color cathode ray tube |
-
1980
- 1980-06-20 JP JP8282380A patent/JPS579032A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990027741A (en) * | 1997-09-30 | 1999-04-15 | 김영남 | Cathode structure for electron gun |
| KR20000013376A (en) * | 1998-08-07 | 2000-03-06 | 구자홍 | The cathode structure for color cathode ray tube |
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