Deflection device for use with in-line type color cathode ray tu

Details Deflection device for use with in-line type color cathode ray tu Deflection device for use with in-line type color cathode ray tu

1977-01-26

1978-10-24

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Electron or ion beam deflecting type

335210, H01F 500

Patent

active

041224221

ABSTRACT:
In a deflection yoke for use with an in-line color cathode ray tube in which a plurality of electron beams originating in a common plane, for example, a horizontal plane, within a tube envelope are directed forwardly along paths converging through the deflection yoke to impinge on a screen at the front of the tube envelope, and in which the deflection yoke is made up of vertical and horizontal deflection windings for producing magnetic fields by which the electron beams are deflected in vertical and horizontal directions, each of the vertical and horizontal deflection windings is of saddle form so as to have side portions connected by bent front and back end portions, the vertical deflection winding is disposed against the tube envelope and has its bent back end portion shaped to closely conform to the surface of the tube envelope, the horizontal deflection winding is disposed outside of the vertical deflection winding, and the bent back end portion of the vertical deflection winding is closer to the screen at the front of the picture tube than the bent back end portion of the horizontal deflection winding. Furthermore, the vertical and horizontal deflection windings are preferably arranged to produce barrel-type and pincushion type magnetic fields, respectively, and a toroidal magnetic core extends around the horizontal deflection winding. The use of the foregoing deflection yoke with an in-line color cathode ray tube makes it possible to eliminate or at least substantially simplify the usual dynamic convergence correcting device usually associated with the latter.

REFERENCES:
patent: 4041428 (1977-08-01), Kikuchi et al.

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