US2284655A - Electric discharge tube - Google Patents
Electric discharge tube Download PDFInfo
- Publication number
- US2284655A US2284655A US358068A US35806840A US2284655A US 2284655 A US2284655 A US 2284655A US 358068 A US358068 A US 358068A US 35806840 A US35806840 A US 35806840A US 2284655 A US2284655 A US 2284655A
- Authority
- US
- United States
- Prior art keywords
- discharge tube
- electric discharge
- carrier body
- layer
- cathode
- 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 - Lifetime
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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
- H01J1/15—Cathodes heated directly by an electric current
Definitions
- This invention is concerned with flat cathodes of the kind employed in electron tubes. More particularly the invention relates to cathodes which comprise a ilat carrier body and an emissive layer fitted to it on only one side thereof, namely, the side on which the other electrodes, as anode and grid, are located.
- a cathode which on the other or opposite side of the flat carrier body, that is, the side having no emissive layer, is covered with a protective layer in order to prevent the carrier body, made of nickel, for instance, from volatilizing or evaporating on this side during the operation of the tube.
- a protective layer may consist of an alkaline earth oxide or may be a ceramic disc.
- a radiation inhibiting layer be arranged to constitute the protective layer, as will be understood from the following description.
- FIG. 1 shows a diagrammatic sectional view of an electron tube Whose cathode is an example of devices as provided by the invention.
- a grid 3 and a cathode are contained in a vacuum vessel I.
- the cathode comprises a ilat metallic carrier body 4, an emissive layer 5 arranged to face the grid, and a. radiation inhibiting layer 8 on the side remote from the grid.
- Layer 8 comprises a highly polished metal which has an optical radiating capacity less than that of the carrier body 4. As a result this body is prevented from volatilizing, whereby the heating power to be supplied to it is considerably less than in prior devices.
- a discharge tube having a cathode which comprises a flat metallic carrier body, an emissive layer fitted to this body on one side thereof, and a radiation inhibiting layer tted to the carrier body on the other side, said radiation-inhibiting layer comprising a highly polished metal having an -optical radiating capacity less than that of the carrier body.
Landscapes
- Vessels And Coating Films For Discharge Lamps (AREA)
Description
June 2, 1942. F. HERRIGER 2,234,555
ELECTRIC DISCHARGETUBE Filed Sept. 24, 1940 Patented` June 2, 1942 l ELECTRIC DISCHARGE TUBE Felix Herrger, Berlin, Germany, assignor to C. Lorenz Aktiengesellschaft, Berlin-Tempelhof, Germany, a company Application September 24, 1940, Serial No. 358,068
In Germany October 26, 1939 1 Claim.
This invention is concerned with flat cathodes of the kind employed in electron tubes. More particularly the invention relates to cathodes which comprise a ilat carrier body and an emissive layer fitted to it on only one side thereof, namely, the side on which the other electrodes, as anode and grid, are located.
In the copending application of E. Lpp et al., Serial No. 289,644, filed August 11, 1939, a cathode is described which on the other or opposite side of the flat carrier body, that is, the side having no emissive layer, is covered with a protective layer in order to prevent the carrier body, made of nickel, for instance, from volatilizing or evaporating on this side during the operation of the tube. According to this copending application such protective layer may consist of an alkaline earth oxide or may be a ceramic disc.
According to the invention described hereafter it is proposed that a radiation inhibiting layer be arranged to constitute the protective layer, as will be understood from the following description. 'I'he accompanying drawing shows a diagrammatic sectional view of an electron tube Whose cathode is an example of devices as provided by the invention.
In a vacuum vessel I an anode 2, a grid 3 and a cathode are contained. The cathode comprises a ilat metallic carrier body 4, an emissive layer 5 arranged to face the grid, and a. radiation inhibiting layer 8 on the side remote from the grid. Layer 8 comprises a highly polished metal which has an optical radiating capacity less than that of the carrier body 4. As a result this body is prevented from volatilizing, whereby the heating power to be supplied to it is considerably less than in prior devices.
What is claimed is:
A discharge tube having a cathode which comprises a flat metallic carrier body, an emissive layer fitted to this body on one side thereof, and a radiation inhibiting layer tted to the carrier body on the other side, said radiation-inhibiting layer comprising a highly polished metal having an -optical radiating capacity less than that of the carrier body.
FELIX HERRIGER.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2284655X | 1939-10-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2284655A true US2284655A (en) | 1942-06-02 |
Family
ID=7993638
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US358068A Expired - Lifetime US2284655A (en) | 1939-10-26 | 1940-09-24 | Electric discharge tube |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2284655A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2723363A (en) * | 1952-04-01 | 1955-11-08 | Gen Electric | Cathode and method of producing same |
-
1940
- 1940-09-24 US US358068A patent/US2284655A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2723363A (en) * | 1952-04-01 | 1955-11-08 | Gen Electric | Cathode and method of producing same |
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