JPH0511293U - Deflection yoke core - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to a trumpet-shaped core in which a large number of coil winding guide grooves are formed substantially along the axial direction. A deflection yoke having a high magnetic field distribution adjustment capability is realized. [Structure] The guide grooves are formed so that the extension lines of the guide grooves 2a and 2b have a non-radiating pattern that does not converge on the central axis P of the trumpet core 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a deflection yoke used in various CRT display devices such as a television receiver, and more particularly to the structure of its core.

[0002]

[Prior Art]

 For example, as described in Japanese Utility Model Laid-Open No. 53-118414, a deflection yoke core having a structure shown in FIG. 3 has been well known. In FIG. 3, the core 1 is formed of a magnetic material such as ferrite in a trumpet shape, and a large number of coil winding guide grooves 2 are formed on the inner surface of the core 1 substantially along the axial direction. The extension line of each guide groove 2 is focused on the central axis P of the trumpet core 1. That is, each guide groove 2 is formed on the inner surface of the core 1 so as to form a complete radiation pattern centered on P. As is well known, the windings of the toroidal vertical deflection coil and the saddle horizontal deflection coil are laid along the guide groove 2.

[0003]

[Problems to be solved by the device]

 In the deflection yoke core 1 in which the coil winding guide groove 2 is formed in a complete radiation pattern as shown in FIG. 3, when the coil winding is mounted on the deflection yoke core 1, the winding distribution function with respect to the circumferential angle is It does not change much depending on the position. For this reason, it is not easy to adjust the magnetic field distribution, and almost all other means must be used to adjust barrel scanning distortion, pincushion distortion, and convergence characteristics. Therefore, as disclosed in Japanese Patent Laid-Open No. 62-93840, the coil winding guide groove is not entirely provided on the inner surface of the core, but the guide groove is provided only on the inner surface of the small diameter portion of the trumpet core. It is also known that a part is not provided with a guide groove. According to this, since the horizontal deflection coil and the vertical deflection coil can be wired by a free pattern without being defined by the guide groove, it is possible to obtain a deflection yoke whose magnetic field distribution can be easily adjusted. However, since the wiring pattern of the deflection coil is not defined in the guide groove, it is very troublesome to wire the coil in the pattern as designed, and the variation in the characteristics of each product increases.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to make it possible to easily and accurately wire a deflection coil in accordance with a predesigned pattern, and finally to provide a magnetic field. It is an object of the present invention to provide a core structure capable of constructing a deflection yoke having characteristics in which distribution can be easily adjusted.

[0005]

[Means for Solving the Problems]

 Therefore, in this invention, a large number of coil winding guide grooves are formed on the inner surface of the trumpet-shaped core substantially along the axial direction. However, the extension line of each guide groove does not converge on the central axis of the trumpet-shaped core. The guide groove was formed so as to form a pattern.

[0006]

[Action]

 By forming the coil winding guide groove of the core in a non-radiating pattern according to the pre-designed wiring pattern of the vertical deflection coil and the horizontal deflection coil, the guide wire is used to arrange the coil according to the desired pattern. Moreover, it is possible to easily realize the deflection yoke in which the winding distribution function relating to the angle in the circumferential direction is changed as desired according to the core axis direction, and the adjustment of the magnetic field distribution becomes easy.

[0007]

【Example】

 FIG. 1 shows a deflection yoke core according to an embodiment of the present invention. A total of 16 coil winding guide grooves 2a and 2b are formed on the inner surface of the trumpet-shaped core 1 substantially along the axial direction. The non-radiating pattern of the guide groove of the first embodiment is vertically symmetrical with respect to a horizontal line passing through the central axis P of the trumpet core 1 and horizontally symmetrical with respect to a vertical line. The extension line of each guide groove does not converge on the central axis P. The extension lines of the eight guide grooves 2a in the upper half of the figure are focused at a point A slightly below the central axis P of the core 1. The lower half is also symmetrical, and the extension lines of the eight guide grooves 2b are converged at a point B, which is slightly above the central axis P.

FIG. 2 shows a deflection yoke core according to a second embodiment of the present invention. Also in this embodiment, 22 coil winding guide grooves 20 to 25 and 30 to 35 are formed on the inner surface of the trumpet core 1 substantially along the axial direction. The non-radiative pattern of the guide groove is also vertically symmetrical with respect to the horizontal line passing through the central axis P and symmetrical with respect to the vertical line. Here, the extension line of the uppermost guide groove 20 and the extension line of the lowermost guide groove 30 are the same straight line passing through the central axis P. The extension lines of the guide grooves 21 on the left and right of the guide groove 20 intersect on a vertical line passing through P, and the intersection is below P by a distance a. The extension lines of the guide grooves 22 on both sides of the guide groove 21 also intersect on a vertical line passing through P, and the distance between the intersection and P is b. Similarly, the extension lines of the two guide grooves 23 also intersect on the vertical line, and the distance between the intersection and P is c. Similarly, the extension lines of the two guide grooves 24 also intersect on the vertical line, and the distance between the intersection and P is d. Similarly, the extension lines of the two guide grooves 25 also intersect on the vertical line, and the distance between the intersection and P is e. Then, as shown in the figure, a> b> c> d> e is set. Eleven guide grooves 30 to 35 are formed in a completely symmetrical pattern.

[0009]

[Effect of the device]

 As described above, in the deflection yoke core of the present invention, the guide groove is formed so that the extension line of each guide groove does not converge on the center line of the trumpet-shaped core, and thus the guide groove is formed along the guide groove. By laying the vertical deflection coil and the horizontal deflection coil, it is possible to realize a deflection yoke with uniform characteristics by a simple operation, and the winding distribution function is used to correct barrel scanning distortion and pinction figure distortion, as well as convergence. It is possible to realize a deflection yoke having a high ability to adjust the magnetic field distribution that contributes to the correction of the characteristics.

[Brief description of drawings]

FIG. 1 is a front view and a sectional view of a deflection yoke core according to a first embodiment of the present invention.

FIG. 2 is a front view and a sectional view of a deflection yoke core according to a second embodiment of the present invention.

FIG. 3 is a front view and a cross-sectional view of a conventional deflection yoke core.

[Explanation of symbols]

 1 core 2 guide groove 2a, 2b guide groove 20-25 guide groove 30-35 guide groove P center axis

Claims (1)

[Claims for utility model registration] [Claim 1] A plurality of coil winding guide grooves are formed substantially along the axial direction on the inner surface of a core formed of a magnetic material in a trumpet shape. The deflection yoke core is characterized in that a guide groove is formed in a non-radiative pattern in which the extension line of the is not focused on the central axis of the trumpet core.