GB773580A - Improvements in or relating to cathode structures for electron discharge devices - Google Patents
Improvements in or relating to cathode structures for electron discharge devicesInfo
- Publication number
- GB773580A GB773580A GB2281753A GB2281753A GB773580A GB 773580 A GB773580 A GB 773580A GB 2281753 A GB2281753 A GB 2281753A GB 2281753 A GB2281753 A GB 2281753A GB 773580 A GB773580 A GB 773580A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cathode
- aperture
- legs
- insulator
- heater
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
- H01J29/48—Electron guns
- H01J29/485—Construction of the gun or of parts thereof
Landscapes
- Solid Thermionic Cathode (AREA)
Abstract
773,580. Thermionic cathode constructions. ELECTRIC & MUSICAL INDUSTRIES, Ltd. Aug. 3, 1954 [Aug. 19, 1953], No. 22817/53. Class 39(1). An indirectly heated cathode structure comprises an insulating disc having an aperture, a cathode comprising a tubular body closed at one end and containing a heater wherein the edges of the open end of the cathode body are seated on the insulating member around the aperture, the heater extending through the aperture in the insulating member into the cathode body so that the end of the heater remote from the tubular cathode body is closely surrounded by the insulating wall of the aperture. In one form, Fig. 3, an insulator 1 of moulded and fired ceramic is provided on one or both sides with circular ridges 3 which prevent metal deposition occurring in operation from forming a continuous path from the centre to the edges, is countersunk at 4 and thickened at 5 and has a central aperture from which three longitudinal slots extend radially. The cathode 7 is closed at one end by an integral portion thereof or by a separate cap and has three strip legs 8,120 degrees apart which in assembly are passed through the slots and their ends bent over. A connecting tape 9 welded to the end of one of legs 8 is threaded through a hole 10 in the insulator. The heater 11 of " molytungsten " wire coated with insulation is thus enclosed partly by the cathode tube 7 and partly by insulator 1; it may contact insulator 1 but not legs 8. In an alternative construction holes can be drilled in the insulator around the central aperture and the cathode legs passed through them, the ends of the legs being bent away from the axis of the central aperture. The invention can be applied to cathode ray tubes, especially for television purposes, klystrons and travelling- wave tubes. The heater may be multiply folded instead of helical.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2281753A GB773580A (en) | 1953-08-19 | 1953-08-19 | Improvements in or relating to cathode structures for electron discharge devices |
FR1106548D FR1106548A (en) | 1953-08-19 | 1954-08-18 | Improvements to cathode structures for electron tubes |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2281753A GB773580A (en) | 1953-08-19 | 1953-08-19 | Improvements in or relating to cathode structures for electron discharge devices |
Publications (1)
Publication Number | Publication Date |
---|---|
GB773580A true GB773580A (en) | 1957-05-01 |
Family
ID=10185522
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2281753A Expired GB773580A (en) | 1953-08-19 | 1953-08-19 | Improvements in or relating to cathode structures for electron discharge devices |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR1106548A (en) |
GB (1) | GB773580A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3204141A (en) * | 1962-08-20 | 1965-08-31 | Kentucky Electronics Inc | Electron gun |
US6294105B1 (en) | 1997-12-23 | 2001-09-25 | International Business Machines Corporation | Chemical mechanical polishing slurry and method for polishing metal/oxide layers |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2942137A (en) * | 1957-11-18 | 1960-06-21 | Gen Electric | Cathode sleeve |
-
1953
- 1953-08-19 GB GB2281753A patent/GB773580A/en not_active Expired
-
1954
- 1954-08-18 FR FR1106548D patent/FR1106548A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3204141A (en) * | 1962-08-20 | 1965-08-31 | Kentucky Electronics Inc | Electron gun |
US6294105B1 (en) | 1997-12-23 | 2001-09-25 | International Business Machines Corporation | Chemical mechanical polishing slurry and method for polishing metal/oxide layers |
Also Published As
Publication number | Publication date |
---|---|
FR1106548A (en) | 1955-12-20 |
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