GB731978A - Improvements in or relating to magnetic focussing devices for cathode ray tubes - Google Patents
Improvements in or relating to magnetic focussing devices for cathode ray tubesInfo
- Publication number
- GB731978A GB731978A GB351653A GB351653A GB731978A GB 731978 A GB731978 A GB 731978A GB 351653 A GB351653 A GB 351653A GB 351653 A GB351653 A GB 351653A GB 731978 A GB731978 A GB 731978A
- Authority
- GB
- United Kingdom
- Prior art keywords
- magnets
- ray tubes
- plate
- relating
- feb
- 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
- 230000005291 magnetic effect Effects 0.000 title abstract 2
- 239000000853 adhesive Substances 0.000 abstract 1
- 230000001070 adhesive effect Effects 0.000 abstract 1
- 230000005294 ferromagnetic effect Effects 0.000 abstract 1
- 229910000859 α-Fe Inorganic materials 0.000 abstract 1
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
- H01J29/68—Magnetic lenses using permanent magnets only
Landscapes
- Video Image Reproduction Devices For Color Tv Systems (AREA)
Abstract
731,978. Cathode-ray tubes. COLE, Ltd., E. K., and LEVI, J. E. Feb. 8, 1954 [Feb. 7, 1953], No. 3516/53. Class 39 (1). Parallel annular focusing magnets are mounted on separate frames, one of which is slidable in the direction' of the magnet axis. Magnets A, C are fixed to supports B, D by an adhesive and projections B1, support D being slidable on two parallel rods H and adjusted by a threaded Archimedean screw J which is fastened to the plate B by the split pin T. Adjustable lugs E are used to support the arrangement. The screw J is gripped by two rods K which are stressed towards each other at the ends and are mounted with the frame D. Additional adjustment of the beam is provided by a magnetic annular plate held within a depression of a plate N and which is frictionally rotatable against a resilient strip S which is fastened to the frame B. The magnets are of ferromagnetic ferrite, axially magnetized, with the adjacent faces of like polarity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB351653A GB731978A (en) | 1953-02-07 | 1953-02-07 | Improvements in or relating to magnetic focussing devices for cathode ray tubes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB351653A GB731978A (en) | 1953-02-07 | 1953-02-07 | Improvements in or relating to magnetic focussing devices for cathode ray tubes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB731978A true GB731978A (en) | 1955-06-15 |
Family
ID=9759804
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB351653A Expired GB731978A (en) | 1953-02-07 | 1953-02-07 | Improvements in or relating to magnetic focussing devices for cathode ray tubes |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB731978A (en) |
-
1953
- 1953-02-07 GB GB351653A patent/GB731978A/en not_active Expired
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