GB534215A - Improvements in or relating to electron discharge devices - Google Patents
Improvements in or relating to electron discharge devicesInfo
- Publication number
- GB534215A GB534215A GB21913/39A GB2191339A GB534215A GB 534215 A GB534215 A GB 534215A GB 21913/39 A GB21913/39 A GB 21913/39A GB 2191339 A GB2191339 A GB 2191339A GB 534215 A GB534215 A GB 534215A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cathode
- lens
- electrode
- kilovolts
- potential
- 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
- 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
- H01J29/52—Arrangements for controlling intensity of ray or beam, e.g. for modulation
Landscapes
- Details Of Television Scanning (AREA)
- Cold Cathode And The Manufacture (AREA)
Abstract
534,215. Cathode-ray tubes. KLEMPERER, O. July 28, 1939, No. 21913. [Class 39 (i)] In a cathode-ray tube wherein a cross-over in the beam is obtained by a modulating electrode which is biased to zero or negative potential, the change in axial position of the crossover due to the modulation is substantially compensated by an electron lens of the saddle field type which focuses the cross over B on the screen. The first electrode L1 is at a high positive potential to accelerate the beam from the cathode ; the second L2 is at a lower potential to decelerate the beam and form a space charge in the region of the lens ; the third L3 is at a high positive potential. As examples (i) the first and third are maintained at three kilovolts and the middle one at one kilovolt (ii) the first is at three, the second at two and the third at five kilovolts. The modulating electrode at the cathode varies the electron current in the beam and this variation acting through the space charge and the lens varies the focal length of the lens and thus compensates for the shift of the first cross over. The potentials in (i) may overcompensate the shift due to the modulating electrode ; this can be negatived by making the central electrode L2 long. Electrodes of diaphragm form may be used-instead of tubular electrodes-to handle beams of larger diameter. Specifications 470,004 and 505,751 are referred to.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB21913/39A GB534215A (en) | 1939-07-28 | 1939-07-28 | Improvements in or relating to electron discharge devices |
US347460A US2367130A (en) | 1939-07-28 | 1940-07-25 | Electron discharge device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB21913/39A GB534215A (en) | 1939-07-28 | 1939-07-28 | Improvements in or relating to electron discharge devices |
Publications (1)
Publication Number | Publication Date |
---|---|
GB534215A true GB534215A (en) | 1941-03-03 |
Family
ID=10170900
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB21913/39A Expired GB534215A (en) | 1939-07-28 | 1939-07-28 | Improvements in or relating to electron discharge devices |
Country Status (2)
Country | Link |
---|---|
US (1) | US2367130A (en) |
GB (1) | GB534215A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3032673A (en) * | 1958-01-02 | 1962-05-01 | Hughes Aircraft Co | Direct-view half-tone storage tube |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3342993A (en) * | 1964-09-21 | 1967-09-19 | Bendix Corp | Time-of-flight mass spectrometer having an accelerating tube with a continuous resistive coating |
FR2201536B1 (en) * | 1972-09-26 | 1976-08-13 | Thomson Csf | |
US4344017A (en) * | 1979-05-08 | 1982-08-10 | Mitsubishi Denki Kabushiki Kaisha | Cathode ray tube used as light source |
-
1939
- 1939-07-28 GB GB21913/39A patent/GB534215A/en not_active Expired
-
1940
- 1940-07-25 US US347460A patent/US2367130A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3032673A (en) * | 1958-01-02 | 1962-05-01 | Hughes Aircraft Co | Direct-view half-tone storage tube |
Also Published As
Publication number | Publication date |
---|---|
US2367130A (en) | 1945-01-09 |
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