| 摘要 |
PURPOSE:To correct the variation of the horizontal trapezoidal distortion and horizontal linearity generated since a projected optical axis is inclined for a screen without using an electric distortion correction circuit by providing an asymmetrical jumper coil for the vertical central line of a deflection yoke. CONSTITUTION:One conductor of jumper coils 17a and 17b is arranged on a horizontal deflection coil 11 and the other conductor is arranged near a vertical central axis 16 in which the horizontal deflection coil 11 does not exist. When the right semi-surface of a CRT for projection is deflected, current flows in the horizontal deflection coil 11 and the magnetic field 18 that is symmetrical to the vertical central line 16 and horizontal central line 15 is generated. At the same time, inverse induced current iS flows in jumper coils 17a and 17b arranged on the horizontal deflection coil 11 and an asymmetrical magnetic field 19 is generated for the vertical central line 16 by the jumper coils 17a and 17b. The sum of magnetic fields 18 and 19 forms a magnetic field 20 that differs in the curvature of right and left magnetic force lines and their density for the vertical central line 16. |
