GB495707A - Improvements in or relating to focussing systems for use in electric discharge tubes - Google Patents
Improvements in or relating to focussing systems for use in electric discharge tubesInfo
- Publication number
- GB495707A GB495707A GB11003/37A GB1100337A GB495707A GB 495707 A GB495707 A GB 495707A GB 11003/37 A GB11003/37 A GB 11003/37A GB 1100337 A GB1100337 A GB 1100337A GB 495707 A GB495707 A GB 495707A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lens
- focused
- cathode
- relating
- screen
- 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
- H01J35/00—X-ray tubes
- H01J35/02—Details
- H01J35/14—Arrangements for concentrating, focusing, or directing the cathode ray
-
- 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
- H01J29/58—Arrangements for focusing or reflecting ray or beam
- H01J29/62—Electrostatic lenses
- H01J29/622—Electrostatic lenses producing fields exhibiting symmetry of revolution
- H01J29/624—Electrostatic lenses producing fields exhibiting symmetry of revolution co-operating with or closely associated to an electron gun
Landscapes
- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
Abstract
495,707. Cathode - ray tubes ; Rontgen-ray tubes. NICOLL, F. H. April 17, 1937, No. 11003. [Class 39 (i)] The ratio of voltages applied to the electrodes 7, 8 of a single electron lens is so high that the beam is brought to an intermediate focus within the lens field and is further focused at a point which is free from the lens field. The beam may be emitted from a thermionic cathode 5 or from a photo-electric cathode upon which an image is projected. In the form shown, the beam is focused by the cylinders 7, 8 on to the anticathode 9. The lens may comprise two apertured diaphragms, and the beam may be focused onto a fluorescent screen or onto a mosaic screen in a transmitting tube. An image of an object, such as a grid, placed within the cylinder 7 may be produced on the screen. The voltage ratio is greater than 70 to 1 and may be as great as several thousand to one. The Specification contains examples of voltages and dimensions of the electrodes.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB11003/37A GB495707A (en) | 1937-04-17 | 1937-04-17 | Improvements in or relating to focussing systems for use in electric discharge tubes |
US200284A US2240120A (en) | 1937-04-17 | 1938-04-06 | Electron device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB11003/37A GB495707A (en) | 1937-04-17 | 1937-04-17 | Improvements in or relating to focussing systems for use in electric discharge tubes |
Publications (1)
Publication Number | Publication Date |
---|---|
GB495707A true GB495707A (en) | 1938-11-17 |
Family
ID=9978259
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB11003/37A Expired GB495707A (en) | 1937-04-17 | 1937-04-17 | Improvements in or relating to focussing systems for use in electric discharge tubes |
Country Status (2)
Country | Link |
---|---|
US (1) | US2240120A (en) |
GB (1) | GB495707A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2417850A1 (en) * | 1978-02-15 | 1979-09-14 | Tektronix Inc | ELECTRON DISCHARGE DEVICE, WITH DYNAMIC FOCUS CORRECTION |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL114571B (en) * | 1943-12-31 | |||
BE469098A (en) * | 1946-05-09 | |||
CH272088A (en) * | 1947-02-11 | 1950-11-30 | Dent Ott Walter Dr Med | X-ray equipment. |
GB730803A (en) * | 1951-11-08 | 1955-06-01 | Licentia Gmbh | Improvements in and relating to x-ray tubes |
US3233144A (en) * | 1962-02-01 | 1966-02-01 | Nippon Electric Co | Electrostatic lens for magnifying deflection of electron beams or the like |
-
1937
- 1937-04-17 GB GB11003/37A patent/GB495707A/en not_active Expired
-
1938
- 1938-04-06 US US200284A patent/US2240120A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2417850A1 (en) * | 1978-02-15 | 1979-09-14 | Tektronix Inc | ELECTRON DISCHARGE DEVICE, WITH DYNAMIC FOCUS CORRECTION |
Also Published As
Publication number | Publication date |
---|---|
US2240120A (en) | 1941-04-29 |
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