GB1285866A - Improvements in or relating to cathodes for use in electric discharge devices - Google Patents
Improvements in or relating to cathodes for use in electric discharge devicesInfo
- Publication number
- GB1285866A GB1285866A GB3020370A GB3020370A GB1285866A GB 1285866 A GB1285866 A GB 1285866A GB 3020370 A GB3020370 A GB 3020370A GB 3020370 A GB3020370 A GB 3020370A GB 1285866 A GB1285866 A GB 1285866A
- Authority
- GB
- United Kingdom
- Prior art keywords
- layer
- substrate
- conductivity type
- layers
- sic
- 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
- H01J1/30—Cold cathodes, e.g. field-emissive cathode
- H01J1/308—Semiconductor cathodes, e.g. cathodes with PN junction layers
Landscapes
- Cold Cathode And The Manufacture (AREA)
Abstract
1285866 Cathode materials GENERAL ELECTRIC CO Ltd 22 June 1971 [22 June 1970] 302O3/70 Heading HID A cathode comprises a substrate 2 of high resistivity material and a layer 3 of semiconductor material of one conductivity type with a beveled surface 5 covered with a layer 6 of semi-conductor material of a second conductivity type, the two layers forming a P-N junction 9 with an emitting edge 11. Layers 2, 3 of intrinsic SiC and P-type SiC are epitaxially grown on a substrate 1 of N-type SiC. A surface 5 is lapped with diamond paste, cleaned and layer 6 of N-type SiC deposited. Parallel slots 7 are cut through layer 3 to divide it into strips. SiO 2 is deposited over the structure including the exposed edges of the junctions to suppress emission. A protective coating of SiN 2 is added, the top surface 10 is lapped to expose a number of parallel emitting edges 11 and a plurality of electrodes 12 and a common electrode 13 added. The substrate may be of insulating material or dispensed with if layer 2 is sufficiently thick, the electrode 13 is then applied to layer 6. The conductivity type of the layers may be reversed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3020370A GB1285866A (en) | 1970-06-22 | 1970-06-22 | Improvements in or relating to cathodes for use in electric discharge devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3020370A GB1285866A (en) | 1970-06-22 | 1970-06-22 | Improvements in or relating to cathodes for use in electric discharge devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1285866A true GB1285866A (en) | 1972-08-16 |
Family
ID=10303918
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3020370A Expired GB1285866A (en) | 1970-06-22 | 1970-06-22 | Improvements in or relating to cathodes for use in electric discharge devices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1285866A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2232074A1 (en) * | 1973-06-01 | 1974-12-27 | English Electric Valve Co Ltd | |
| GB2347785A (en) * | 1999-03-06 | 2000-09-13 | Smiths Industries Plc | Electron-emitting devices |
-
1970
- 1970-06-22 GB GB3020370A patent/GB1285866A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2232074A1 (en) * | 1973-06-01 | 1974-12-27 | English Electric Valve Co Ltd | |
| GB2347785A (en) * | 1999-03-06 | 2000-09-13 | Smiths Industries Plc | Electron-emitting devices |
| GB2347785B (en) * | 1999-03-06 | 2003-12-17 | Smiths Industries Plc | Electron-emitting devices |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |