Deflection yoke device
AssigneeMurata Mfg. Co., Ltd.
InventorShinji Ohtsu
Life of this patent
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Abstract
A deflection yoke device for deflecting an electron beam traveling in the interior of a CRT. The distribution of a magnetic field supplied by horizontal deflection coils to the interior of the CRT forms a barrel magnetic field on the panel side and the neck side, as viewed from the horizontal deflection coils, and a pin magnetic field in an intermediate space therebetween. The deflection yoke device of the invention is provided with a correction coil on the neck side, as viewed from the horizontal deflection coils so as to correct the neck-side magnetic field produced by the horizontal deflection coils into the barrel magnetic field of a greater intensity. The distortion of a beam focus caused by the pin magnetic field is thereby corrected.
Claims20
A deflection yoke device having two horizontal deflection coils that are respectively wound into a saddle-type configuration at mutually opposing positions on an outer side of a tapered side wall of a CRT and are adapted to supply a horizontally deflecting magnetic field to the interior of said CRT upon receipt of a horizontally deflecting current so as to horizontally deflect an electron beam traveling in said CRT, said deflection yoke device comprising:
- at least one correction coil connected and proximal to said horizontal deflection coils and disposed on a neck side of said CRT, as viewed from said horizontal deflection coils, said at least one correction coil producing a barrel magnetic field synchronized with and for correcting the horizontally deflecting magnetic field while improving the electron beam focus.
A deflection yoke device having two horizontal deflection coils that are respectively wound into a saddle-type configuration at mutually opposing positions on an outer side of a tapered side wall of a CRT and are adapted to supply a horizontally deflecting magnetic field to the interior of said CRT upon receipt of a horizontally deflecting current so as to horizontally deflect an electron beam traveling in said CRT, said deflection yoke device also having two vertical deflection coils that are respectively wound into a saddle-type configuration at mutually opposing positions on the outer side of said tapered side wall of said CRT and are adapted to supply a vertically deflecting magnetic field to the interior of said CRT upon receipt of a vertically deflecting current so as to vertically deflect the electron beam traveling in said CRT, said deflection yoke device comprising:
- at least one correction coil connected and proximal to said horizontal deflection coils and disposed on a neck side of said CRT, as viewed from said horizontal deflection coils, said at least one correction coil producing a barrel magnetic field synchronized with and for correcting the horizontally deflecting magnetic field while improving the electron beam focus.
Dependencies are inferred from the claim text.