GB539661A - Improvements in or relating to thermionic discharge devices - Google Patents
Improvements in or relating to thermionic discharge devicesInfo
- Publication number
- GB539661A GB539661A GB862/40A GB86240A GB539661A GB 539661 A GB539661 A GB 539661A GB 862/40 A GB862/40 A GB 862/40A GB 86240 A GB86240 A GB 86240A GB 539661 A GB539661 A GB 539661A
- Authority
- GB
- United Kingdom
- Prior art keywords
- anode
- grid
- ray
- potential
- 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
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J43/00—Secondary-emission tubes; Electron-multiplier tubes
- H01J43/02—Tubes in which one or a few electrodes are secondary-electron emitting electrodes
Landscapes
- Electron Tubes For Measurement (AREA)
- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
Abstract
539,661. Cathode-ray tubes : modulating apparatus. INTERNATIONAL TELEVISION CORPORATION, Ltd., NAGY, P., and GODDARD, M. J. Jan. 15, 1940, No. 862. [Classes 39 (i) and 40 (v)] A cathode-ray tube for signal transmission is provided with an output anode having a high secondary emission ratio and the anode is so combined with two electrodes, one at a high positive potential and one near cathode potential, that the ray falling or one portion of it provokes a high secondary emission and the anode becomes positive, while if the ray falls on the other portion the emission is checked and the anode becomes negative. The potentials thus pro duced are applied to charge and discharge a capacity such as the grid circuit of an amplifying valve. The anode shown consists of three portions X, Y, Z, the portions Y, Z being screened from the electron gun by a grid W connected to the anode V of the tube and the part X is screened from the grid W by a grid V which is slightly positive with respect to the cathode. The potential of the anode tends to that of the grid V or the grid W as the ray falls on the portion X or on the portion Y, Z, but the potential actually attained depends on the time during which the ray falls on the portions in question, and therefore on the frequency of an alternating potential applied to the deflecting plates P 1 or P 3 , the value of such potential and the mean position of the ray. The consequences of this are discussed with reference to signal transmission by means of a carrier potential applied to one of the pairs of plates P 1 , P 3 and a signal potential applied to the other. The potentials produced at the anode are applied to the grid E of valve H. The cathode C is an elongated filament and the ray in the form of a flat beam. The anode is shaped to compensate for various causes of distortion which are discussed. Several parallel cathodes forming parallel beams may be employed. Fig. 2a shows an anode for use with such an arrangement of cathodes. In this case the grid V may be dispensed with, the electrons from the portion X being trapped by the portions Y, Z. To reduce the length of the tube the beam may be caused to take a helical path by a magnetic field.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB862/40A GB539661A (en) | 1940-01-15 | 1940-01-15 | Improvements in or relating to thermionic discharge devices |
| US403914A US2313886A (en) | 1940-01-15 | 1941-07-24 | Electronic valve device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB862/40A GB539661A (en) | 1940-01-15 | 1940-01-15 | Improvements in or relating to thermionic discharge devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB539661A true GB539661A (en) | 1941-09-19 |
Family
ID=9711780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB862/40A Expired GB539661A (en) | 1940-01-15 | 1940-01-15 | Improvements in or relating to thermionic discharge devices |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2313886A (en) |
| GB (1) | GB539661A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2446260A (en) * | 1944-07-31 | 1948-08-03 | Farnsworth Res Corp | Differentiating discharge tube |
| US2513260A (en) * | 1945-03-07 | 1950-06-27 | Ericsson Telefon Ab L M | Electron discharge apparatus |
| US2564063A (en) * | 1945-05-30 | 1951-08-14 | Rca Corp | Electron discharge device and associated circuits |
| US2520244A (en) * | 1946-09-05 | 1950-08-29 | Rca Corp | Television pickup tube |
| US2460690A (en) * | 1946-11-14 | 1949-02-01 | Askania Regulator Co | Modulator |
| NL166779B (en) * | 1951-01-18 | Warmac Ltd | HEATING INSTALLATION OR SIMILAR DEVICE OPERATING WITH A PRESSURE LIQUID. |
-
1940
- 1940-01-15 GB GB862/40A patent/GB539661A/en not_active Expired
-
1941
- 1941-07-24 US US403914A patent/US2313886A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US2313886A (en) | 1943-03-16 |
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