GB816080A - An improved focussing arrangement for cathode ray tubes - Google Patents
An improved focussing arrangement for cathode ray tubesInfo
- Publication number
- GB816080A GB816080A GB3600756A GB3600756A GB816080A GB 816080 A GB816080 A GB 816080A GB 3600756 A GB3600756 A GB 3600756A GB 3600756 A GB3600756 A GB 3600756A GB 816080 A GB816080 A GB 816080A
- Authority
- GB
- United Kingdom
- Prior art keywords
- magnet
- assembly
- washer
- wedge
- tube
- 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
- 239000002184 metal Substances 0.000 abstract 2
- 101700073338 COLE Proteins 0.000 abstract 1
- 101700001674 LEVI Proteins 0.000 abstract 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 abstract 1
- 230000005294 ferromagnetic Effects 0.000 abstract 1
- 238000005040 ion trap Methods 0.000 abstract 1
- 230000005291 magnetic Effects 0.000 abstract 1
- 229910000529 magnetic ferrite Inorganic materials 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 230000002093 peripheral Effects 0.000 abstract 1
- 229920000573 polyethylene Polymers 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
816,080. Cathode-ray tubes. COLE Ltd., E. K., and LEVI ,J. E. Nov. 25, 1957 [Nov. 24, 1956], No. 36007/56. Class 39(1). An assembly including an annular focussing magnet J, Fig. 1, is mounted concentrically around the neck A of a cathode-ray tube by means of bearing surfaces D, E, at each end of the assembly so that the assembly is entirely supported by the tube neck. As shown the surfaces D. E are constituted by conically tapered surfaces on split annular wedges, preferably of polythene, and by cooperating surfaces formed on the circular inner edges of washers K 1 , Kz forming the ends of the magnet assembly. The forward wedge D also serves to centre a scanning coil assembly F. The rearward wedge E has a peripheral surface around which a metal clip H is tighened to cause the wedge to grip the tube neck and may also be provided with a projection to mate in a recess in the magnet assembly to prevent accidental rotation. The magnet J is of ferromagnetic ferrite material and is clamped between the two dished washers K 1 , K 2 , the washer K 2 housing a tubular magnetic sleeve S whose position may be altered longitudinally in order to adjust the focussing by means of screwthreaded tube T passing through a captive nut W and riveted to a flange of the sleeve S, guide rods U 1 , U 2 being provided. The forward dished washer W, serves as a housing for an ion trap magnet (not shown) and for a picture centering magnet N secured to a non-ferrous sheet metal stamping which is adjustable relative to the washer W, in two transverse directions at rightangles to each other.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB816080A true GB816080A (en) | 1959-07-08 |
Family
ID=1744456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3600756A Expired GB816080A (en) | 1956-11-24 | An improved focussing arrangement for cathode ray tubes |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB816080A (en) |
-
1956
- 1956-11-24 GB GB3600756A patent/GB816080A/en not_active Expired
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