JPS60745B2 - deflection core - Google Patents

Description

[Detailed description of the invention] Deflection cores are used in television deflection circuits,
It is used to scan the electron beam emitted from the cathode of a cathode ray tube in the horizontal and vertical directions to generate the magnetic field that forms the screen.

It consists of a pair of horizontal and vertical coils and a megaphone-shaped ferrite, and is attached to the neck of the cathode ray tube, covered with a yoke core. The present invention relates to an improvement of a deflection core, which improves manufacturing conditions and has excellent characteristics in terms of required characteristics.

Prior to the present invention, the shape of the deflection core was
Two dividing grooves were provided in each of the inner and outer circumferential surfaces of the megaphone-shaped ferrite core having a large-diameter end face and a 4-diameter end face in the direction of the ball.

In this case, the dividing groove provided on the inner circumferential surface was provided from the large diameter end face to the small diameter end face. However, when forming this type of dividing groove, the dividing groove sword of the upper punch of the mold comes into contact with the lower punch during molding, resulting in damage to the dividing groove sword and a large amount of defective deflation. It was now necessary to manufacture a action core, or to replace the expensive upper punch sword. Even though the upper punch sword was not damaged, the wear on the upper punch sword was significant. In addition, if the inner peripheral surface dividing groove extends from the large diameter end face to the small diameter end face, the small diameter end face of the dividing groove may be chipped or damaged during the inner peripheral surface deburring and polishing process near the small end face of the deflection core. was occurring. The present invention provides an improved deflection core that solves the problems of the above technology.

FIG. 1 is a perspective view of the embodiment, FIG. 2 is a side view of the same, and FIG. 3 is a front view of the same. In FIGS. 1 to 3, the same parts are designated by the same reference numerals. As shown in FIG. 1, an outer circumferential dividing groove 2 is formed on the outer circumferential surface of the megaphone type deflection core 1 along all directions of the axis, and an inner circumferential dividing groove 3 is similarly formed on the inner circumferential surface. The inner circumferential surface dividing groove 3 starts from a portion 31 and reaches a portion 32. The inner peripheral surface dividing groove extends from the large diameter end face 5 to the small diameter end face 4.
leading to. The outer peripheral surface dividing grooves are provided up to the small end face 4, but on the other hand, there is a portion 81 in the vicinity of the large end face where both outer peripheral dividing grooves are not provided. In the present invention, there is a portion 61 in which both inner circumferential dividing grooves are not provided. During molding, the inner peripheral surface dividing groove is formed by the blade of the upper punch.

The outer peripheral surface dividing groove is formed by a lower punch or a mold sword. During molding, the small end face of the flea is facing downward and the end face of the large flea is facing upward. In the present invention, the sword of the upper punch and the lower punch do not collide.

Furthermore, since the inner circumferential surface dividing groove is not provided in both small diameter end portions 61, chipping does not occur during the inner circumferential surface/IJ removal process. This chipping eliminates the variation in characteristics of the deflection yoke that has conventionally occurred, making it possible to obtain a deflection core that matches the required characteristics. The effects are summarized as follows. {1) Mold upper (or lower) punch sword (
This eliminates damage to the split groove (for split grooves), and at the same time greatly reduces wear on the sword.

'2' near the dividing groove near the 4-diameter end face of the inner peripheral surface,
It is possible to prevent chipping during the deburring process that conventionally occurs.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the embodiment, Fig. 2 is a side view of the same, and Fig. 3 is a front view of the same. 1: Megaphone type ferrite core, 2: Outer circumference both dividing grooves, 3
: Inner peripheral surface dividing groove, 4: Small diameter end face, 5: Large diameter end face. 1 figure, 2 figures, 3 figures

Claims (1)

[Claims] 1 In a megaphone-type ferrite core having a large-diameter end face and a small-diameter end face, two dividing grooves are provided along the axial direction on the inner and outer circumferential surfaces, and the dividing grooves provided on the inner circumferential surface are connected to the large-diameter end face. 1. A deflection core characterized in that the dividing grooves are formed so as to start from and end near the small-diameter end face, and the dividing grooves provided on the inner circumferential surface do not reach the small-diameter end face.