GB413950A - Improvements in or relating to oxide-coated cathodes for electron discharge tubes - Google Patents
Improvements in or relating to oxide-coated cathodes for electron discharge tubesInfo
- Publication number
- GB413950A GB413950A GB34722/33A GB3472233A GB413950A GB 413950 A GB413950 A GB 413950A GB 34722/33 A GB34722/33 A GB 34722/33A GB 3472233 A GB3472233 A GB 3472233A GB 413950 A GB413950 A GB 413950A
- Authority
- GB
- United Kingdom
- Prior art keywords
- oxide
- copper
- coating
- cathodes
- heating wire
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
- H01J1/02—Main electrodes
- H01J1/13—Solid thermionic cathodes
- H01J1/14—Solid thermionic cathodes characterised by the material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
- H01J1/02—Main electrodes
- H01J1/13—Solid thermionic cathodes
- H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
- H01J1/26—Supports for the emissive material
Landscapes
- Solid Thermionic Cathode (AREA)
Abstract
413,950. Thermionic cathodes. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN, 13D, Emmasingel, Eindhoven, Holland. Dec. 9, 1933, No. 34722. Convention date, Dec. 10, 1932. [Class 39 (i).] In oxide-coated cathodes, the coating, which is less than 0.1 mm, is applied to a metal or metal alloy having a thermal emissivity less than nickel. Copper, gold, silver or alloy of copper and gold may be used with a coating of barium oxide. Uneven temperature distribution in indirectly heated cathodes is prevented by greater heating at those parts which are more likely to cool ; the pitch of a helical heating wire may be decreased or where a cylindrical cathode is used the ends may be coned to bring them nearer the heating wire. In one construction a small rod of magnesium oxide is formed with two bores close to one another to receive a tungsten heating wire of hairpin shape. A thin copper sheath is placed on the rod, the sheath being applied either as a cylinder or by spraying the metal. The coating of barium oxide having a thickness of 0.02 m.m. is then made, and a leading-in wire is welded to the copper sheath which with the oxide forms the cathode.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL413950X | 1932-12-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB413950A true GB413950A (en) | 1934-07-26 |
Family
ID=19785999
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB34722/33A Expired GB413950A (en) | 1932-12-10 | 1933-12-09 | Improvements in or relating to oxide-coated cathodes for electron discharge tubes |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE399790A (en) |
| FR (1) | FR764126A (en) |
| GB (1) | GB413950A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1777726A2 (en) | 2005-10-21 | 2007-04-25 | Rigaku Corporation | Filament for X-ray tube and X-ray tube having the same |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE739644C (en) * | 1939-04-02 | 1943-10-01 | Sueddeutsche Telefon App Kabel | Directly or indirectly heated glow cathode for electron tubes |
| FR2573590B1 (en) * | 1984-11-20 | 1988-04-08 | Infradep | INFRARED REMOTE DEVICE |
-
0
- BE BE399790D patent/BE399790A/xx unknown
-
1933
- 1933-11-21 FR FR764126D patent/FR764126A/en not_active Expired
- 1933-12-09 GB GB34722/33A patent/GB413950A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1777726A2 (en) | 2005-10-21 | 2007-04-25 | Rigaku Corporation | Filament for X-ray tube and X-ray tube having the same |
| EP1777726A3 (en) * | 2005-10-21 | 2009-10-21 | Rigaku Corporation | Filament for X-ray tube and X-ray tube having the same |
Also Published As
| Publication number | Publication date |
|---|---|
| BE399790A (en) | |
| FR764126A (en) | 1934-05-15 |
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