GB831943A - Improvements relating to electron discharge devices - Google Patents
Improvements relating to electron discharge devicesInfo
- Publication number
- GB831943A GB831943A GB1284055A GB1284055A GB831943A GB 831943 A GB831943 A GB 831943A GB 1284055 A GB1284055 A GB 1284055A GB 1284055 A GB1284055 A GB 1284055A GB 831943 A GB831943 A GB 831943A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lens
- target
- electron discharge
- electrostatic
- magnetic
- 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
- H01J29/58—Arrangements for focusing or reflecting ray or beam
- H01J29/64—Magnetic lenses
- H01J29/66—Magnetic lenses using electromagnetic means only
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Electron Sources, Ion Sources (AREA)
Abstract
831,943. Cathode-ray tubes. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. May 3, 1956 [May 3, 1955], No. 12840/55. Class 39(1). An electron discharge device such as a television camera tube comprises an electron gun 3, 4 adapted to project a beam on to a non- secondary emissive target 2, means 6, 7 for deflecting the beam over the target, a first lens 5 adapted to focus the beam at a point C beyond the target, and a second lens 8 with its principal focus at the effective centre of deflection E, the relation v = u#/u + f being satisfied whereby the beam is focused on the target and impinges substantially normally thereon. The first lens may be magnetic or electrostatic the second lens being preferably an iron shrouded coil having a diameter more than twice that of the scanned area to reduce pin-cushion distortion. The deflecting means may be electrostatic or magnetic.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1284055A GB831943A (en) | 1955-05-03 | 1955-05-03 | Improvements relating to electron discharge devices |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1284055A GB831943A (en) | 1955-05-03 | 1955-05-03 | Improvements relating to electron discharge devices |
Publications (1)
Publication Number | Publication Date |
---|---|
GB831943A true GB831943A (en) | 1960-04-06 |
Family
ID=10012096
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1284055A Expired GB831943A (en) | 1955-05-03 | 1955-05-03 | Improvements relating to electron discharge devices |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB831943A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5039923A (en) * | 1988-10-19 | 1991-08-13 | Hitachi, Ltd. | Focus adjusting device for projection display |
-
1955
- 1955-05-03 GB GB1284055A patent/GB831943A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5039923A (en) * | 1988-10-19 | 1991-08-13 | Hitachi, Ltd. | Focus adjusting device for projection display |
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