1995, In order to manufacture a tube of color images provided with a mask of the post - focusing quadripolar magnetic and devices for the implementation of these.

摘要

P according to a first method according to the invention, it is develops on either side of the mask 7 provided with openings 9 a coil 20, 21, the parallel conductors form of the laces. The coil 21 is orientee perpendicularly to the coil 20. If the coils 20, 21 are traversed by a current flowing in the correct direction, a quadripole magnetic is formed along the circumference of each opening 9. According to a second method according to the invention, it is develops on either side of the mask 7 a support 30, 31 form of strips of a material has permanent magnetization 32. The strips 32 in the support 30 are orthogonal to those in the support 31. Around the supports 30 and 31, it is made of a coil 40 serving to generate an alternating magnetic field fainting, which initially carries a saturation the material of the mask 7 of the two dimensions of the hysteresis curve. After the fainting of this alternating field, a quadripole magnetic is present along the periphery of each opening 9. / p & & p & application: 29 of the color television tubes and / p