| 摘要 |
PROBLEM TO BE SOLVED: To provide a cathode-ray tube device correcting asymmetric focus deterioration caused by center dislocation of an electron gun even after the electron gun is incorporated. SOLUTION: The cathode-ray tube device has the electron gun incorporated in the inside of a neck part and a deflecting yoke mounted on the outer circumference of a funnel part, and a pair of correction coils arranged in the outer circumference of the neck part so as to face in the same direction as a direction in which a pair of vertical deflection coils in the deflection yoke is faced, and the pair of correction coil generates a magnetic field displacing electron beams flowing through the electron gun by supply of DC current in the vertical direction. COPYRIGHT: (C)2005,JPO&NCIPI
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