GB1522387A - Method of manufacturing a dispenser cathode and dispenser cathode manufactured according to said method - Google Patents
Method of manufacturing a dispenser cathode and dispenser cathode manufactured according to said methodInfo
- Publication number
- GB1522387A GB1522387A GB4380075A GB4380075A GB1522387A GB 1522387 A GB1522387 A GB 1522387A GB 4380075 A GB4380075 A GB 4380075A GB 4380075 A GB4380075 A GB 4380075A GB 1522387 A GB1522387 A GB 1522387A
- Authority
- GB
- United Kingdom
- Prior art keywords
- dispenser cathode
- scandate
- polished
- manufacturing
- manufactured according
- 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
- H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
- H01J1/28—Dispenser-type cathodes, e.g. L-cathode
-
- 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)
- Solid Thermionic Cathode (AREA)
Abstract
1522387 Cathode materials and processing PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 24 Oct 1975 [9 Jan 1975] 43800/75 Heading H1D The emitting surface of a dispenser cathode comprising a porous compressed metal body containing Ba scandate is polished to remove any surface layers of the scandate. Subsequent activating results in a layer of Be 2 O 3 and BaO a few molecules thick. The body is formed by compressing at 20 Î 10<SP>3</SP> kg/cm<SP>2</SP> a mixture of W and Ba scandate powder and heating in H 2 to 1,550‹ C. The emitting force is polished with an Al 2 O 3 plate, cleaned ultrasonically and activated by firing at 1,200‹ C. in H 2 . The body is mounted in a Mo cylinder for use in T.V. display and camera tubes.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL7500248A NL7500248A (en) | 1975-01-09 | 1975-01-09 | PROCEDURE FOR MANUFACTURING A PRESSED COMPLIANCE CATHOD AND COMPLIANCE CREDIT MANUFACTURED IN ACCORDANCE WITH THIS PROCESS. |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1522387A true GB1522387A (en) | 1978-08-23 |
Family
ID=19822961
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4380075A Expired GB1522387A (en) | 1975-01-09 | 1975-10-24 | Method of manufacturing a dispenser cathode and dispenser cathode manufactured according to said method |
Country Status (5)
Country | Link |
---|---|
JP (1) | JPS5193659A (en) |
CA (1) | CA1046131A (en) |
FR (1) | FR2297490A1 (en) |
GB (1) | GB1522387A (en) |
NL (1) | NL7500248A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2173943A (en) * | 1985-04-18 | 1986-10-22 | Noblelight Limited | Improvements in and relating to cathodes |
EP1367620A1 (en) * | 2002-05-31 | 2003-12-03 | Thomson Licensing S.A. | Cathode emissive body for an impregnated cathode of an electron tube |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL8201371A (en) * | 1982-04-01 | 1983-11-01 | Philips Nv | METHODS FOR MANUFACTURING A SUPPLY CATHOD AND SUPPLY CATHOD MANUFACTURED BY THESE METHODS |
JPH0850849A (en) * | 1994-05-31 | 1996-02-20 | Nec Kansai Ltd | Cathode member and electronic tube using it |
-
1975
- 1975-01-09 NL NL7500248A patent/NL7500248A/en not_active Application Discontinuation
- 1975-10-24 GB GB4380075A patent/GB1522387A/en not_active Expired
-
1976
- 1976-01-07 JP JP133976A patent/JPS5193659A/en active Granted
- 1976-01-08 CA CA243,153A patent/CA1046131A/en not_active Expired
- 1976-01-09 FR FR7600399A patent/FR2297490A1/en active Granted
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2173943A (en) * | 1985-04-18 | 1986-10-22 | Noblelight Limited | Improvements in and relating to cathodes |
EP1367620A1 (en) * | 2002-05-31 | 2003-12-03 | Thomson Licensing S.A. | Cathode emissive body for an impregnated cathode of an electron tube |
FR2840450A1 (en) * | 2002-05-31 | 2003-12-05 | Thomson Licensing Sa | CATHODO-EMISSIVE BODY FOR CATHODE IMPREGNATED WITH ELECTRONIC TUBE |
US6979942B2 (en) | 2002-05-31 | 2005-12-27 | Thomson Licensing | Cathode emissive body for an impregnated cathode of an electron tube |
Also Published As
Publication number | Publication date |
---|---|
CA1046131A (en) | 1979-01-09 |
FR2297490B1 (en) | 1980-03-28 |
DE2558784A1 (en) | 1976-07-15 |
FR2297490A1 (en) | 1976-08-06 |
JPS5193659A (en) | 1976-08-17 |
JPS5616499B2 (en) | 1981-04-16 |
NL7500248A (en) | 1976-07-13 |
DE2558784B2 (en) | 1977-05-26 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |