Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Electron or ion beam deflecting type
Patent
1985-01-07
1986-03-25
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Electron or ion beam deflecting type
335284, H01F 700
Patent
active
045786615
ABSTRACT:
A method of manufacturing a cathode ray tube in which magnetic poles are provided in or around the neck (4) of the envelope (1) and around the paths of the electron beams extending substantially parallel to the axis (8) of the tube, said poles generating a permanent multipole magnetic field to correct the occurring errors of convergence and color purity and frame defects of the color display tube, which magnetic poles are formed by magnetizing a configuration (17) of magnetizable material which is provided around the paths of the electron beams, which configuration is magnetized by energizing a multipole coil unit (15) by means of a combination of currents with which a static multipole magnetic field is generated and the magnetization is produced by means of a decaying alternating magnetic field which is generated by means of an alternating field coil (16) and which initially drives the magnetizable material on both sides of the hysteresis curve into saturation. When the decaying alternating magnetic field is an axial magnetic field which is substantially parallel to the paths of the electron beams, much less crosstalk occurs in the radial coils (21 to 28) of the multipole coil unit (15) than when a radial alternating field is used and the effect of the stray field components is reduced. The driving of an axial alternating field coil (16) is much simpler than of a number of radial alternating field coils.
REFERENCES:
patent: 3375389 (1968-03-01), Hughes
patent: 4138628 (1979-02-01), Smith
patent: 4162470 (1979-07-01), Smith
patent: 4295110 (1981-10-01), Uesaka et al.
patent: 4390815 (1983-06-01), Key et al.
Meijer Henricus J. J. C.
Thomas Mario L.
Van Der Wilk Ronald
van Rijsewijk Lambertus J. J.
Briody Thomas A.
Harris George
Streeter William J.
U.S. Philips Corporation
LandOfFree
Method of manufacturing a cathode ray tube and device for carryi does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of manufacturing a cathode ray tube and device for carryi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of manufacturing a cathode ray tube and device for carryi will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-633606