Importance

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Abstract

In the vicinity of an end on the side of a large diameter portion of a deflection device, a pair of first permanent magnets for converging three electron beams in an X-axis direction and a pair of second permanent magnets for diverging them in the X-axis direction are provided. Inclination coefficients K.sub.TBH and K.sub.EWH of the distribution curve near the Z axis on the X axis of the Y-axis direction magnetic flux density of the magnetic fields respectively formed by the pair of first permanent magnets and the pair of second permanent magnets satisfy K.sub.TBH/K.sub.EWH<10 in at least one location within a range of 3 to 13 mm on the side of the phosphor screen with respect to a reference line in the Z-axis direction. An inclination coefficient K.sub.H of the distribution curve near the Z axis on the X axis of the Y-axis direction magnetic flux density of a combination magnetic field formed by the pair of first permanent magnets and the pair of second permanent magnets and an inclination coefficient K.sub.V of the distribution curve near the Z axis on the Y axis of the X-axis direction magnetic flux density of the combination magnetic field are both larger than 1.5 (Gauss/cm) in at least one location within the above-noted range. This achieves excellent spot shapes, thus making it possible to reduce change in convergence characteristics due to temperature variation and pincushion distortion of right and left rasters.

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First Claim