JPH0664353U - Deflection yoke - Google Patents

Abstract

(57) [Summary] [Object] To obtain a deflection yoke that can be fixed in a state where the axis of the H coil and the axis of the core, and further the axis of the V coil match. [Configuration] A horizontal deflection coil 1, a vertical deflection coil 2,
In the deflection yoke composed of the separator 3 for separating the two coils, a vertical deflection coil 2 provided with a core 4a whose inner surface is polished and a portion which does not wind in the vertical and horizontal directions when viewed from the screen of the cathode ray tube, and an outside The separator 3 is provided with at least four or more pointed protrusions 3a.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a deflection yoke mounted and fixed to a cathode ray tube and for deflecting an electron beam emitted from an electron gun.

[0002]

[Prior art]

 FIG. 6 is a vertical cross-sectional view of a conventional deflection yoke, and FIG. 7 is a front view when the core of the conventional deflection yoke is tilted and attached. As shown in these figures, the semi-toroidal type deflection yoke includes a pair of horizontal deflection coils (H coils) 1, a pair of vertical deflection coils (V coils) 2 wound directly on the split core 4b, and It is composed of a separator 3 for electrically separating the H coil 1 and the V coil 2.

Generally, since the core 4b is produced by sintering, the variation is large, and the tolerance is about 2% of the designated dimension. Taking a core with an inner diameter of 50 mm as an example, the tolerance is 1 mm. Therefore, the inner diameter of the core is designed to be larger than that of the separator, and the height of the core 4b is designed to be smaller.

That is, since the core 4b has a sufficient size with respect to the separator 3, when the core 4b is assembled, the axis of the core 4b is inclined with respect to the axis of the separator 3 as shown in FIG. It will be. This means that the axis of the H coil 1 is deviated from the axis of the V coil 2 and the axis of the core 4b, and the characteristic of the deflection yoke (particularly the misconvergence characteristic in the case of a color television) varies. In addition, 5 is a gap between the core 4 b and the separator 3.

[0005]

[Problems to be solved by the device]

 Conventionally, as a method of aligning the axis of the V coil 2 and the axis of the core 4b, a sponge having a thickness of about 3 mm is attached to the outside of the separator in the gap to align the axis of the separator and the core. Since the inner diameter of the passing core is not uniform and the height of the V coil wound around the core is not uniform, the axes cannot be precisely aligned.

Also, as disclosed in Japanese Utility Model Laid-Open No. 3-55646, a method of positioning a core by providing a protrusion on the inner surface of the core has been proposed. There was variation in the inner diameter, and accurate axis alignment was not possible.

An object of the present invention is to obtain a deflection yoke that can be fixed in a state where the axis of the H coil and the axis of the core, and further the axis of the V coil match.

[0008]

[Means for Solving the Problems]

 The above object was achieved by providing non-winding portions on the upper and lower sides and the left and right portions of the V coil, providing at least four pointed protrusions on the separator, and combining the cores whose inner surfaces were polished.

[0009]

[Action]

 In the present invention, a pointed protrusion provided on a separator is brought into contact with a core whose inner surface is polished to prevent looseness of the core. Particularly when the V coil is a toroidal type, the V coil is wound directly on the core, so that the axes of the H coil, the V coil, and the core can be aligned.

[0010]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2 show an embodiment of the deflection yoke. FIG. 1 is a front view of the deflection yoke when the front core is removed, and FIG. 2 is a front view of the deflection yoke. 3 and 4 are detailed views of a portion A of FIG. 2, in which a separator 3 having pointed protrusions 3a of various shapes as shown in FIG. 3 or 4 is combined with a core 4a whose inner surface is polished. The details of the protrusions at the time are shown. The polishing core 4a is much more accurate than the core 4b used conventionally.

FIG. 5 is a sectional view (section BB in FIG. 2) perpendicular to the axis of the cathode ray tube. As can be seen from the figure, the V-coil 2 is provided with portions having no windings in the vertical and horizontal positions when viewed from the surface of the cathode ray tube. The above-mentioned pointed protrusions 3a of the separator 3 are provided at four places where the winding is not present, and are in contact with the polishing core 4a. That is, the axis of the separator 3 and the axis of the polishing core 4a are aligned. As a result, the axes of the H coil 1, the V coil 2 and the polishing core 4a are aligned.

[0012] Further, strictly speaking, there is a slight variation in the polished core, but by setting the size of the tip of the pointed protrusion to be as large as the tolerance of the polishing core and crushing it by a small amount when the core is assembled. The axes can be matched.

As a result, the V coil 2 is always assembled in the same state with respect to the H coil 1, and the misalignment of the axes of the H coil and the V coil can be eliminated.

The semi-toroidal type deflection yoke (DY) has been cited above. However, when the V coil is a saddle type, there is an unwound portion (window portion) at the upper and lower positions of the V coil. As in the case of DY, it is clear that the H coil and the core can be aligned.

[0015]

[Effect of device]

 As described above, according to the deflection yoke of the present invention, since the polished core is fixed in at least four directions with respect to the separator, it is not installed in the separator in an inclined state, and the core or the V coil Is completely located. That is, the H coil and the core are assembled in a state where they are mechanically aligned with each other, and there is no misalignment between the H coil and the core (V coil misalignment in the case of a semi-toroidal deflection yoke). However, the variation in performance is reduced, and accordingly, the variation in characteristics of the deflection yoke, particularly the variation in convergence is reduced, and a deflection yoke having significantly improved productivity can be obtained.

[Brief description of drawings]

FIG. 1 is a front view of a deflection yoke according to an embodiment of the present invention when a front side core is removed.

FIG. 2 is a front view of a deflection yoke according to an embodiment of the present invention.

FIG. 3 is an enlarged view of part A of FIG.

FIG. 4 is an enlarged view of part A in FIG.

5 is a sectional view taken along line BB of FIG.

FIG. 6 is a vertical sectional view of a conventional deflection yoke.

FIG. 7 is a front view when a core of a conventional deflection yoke is tilted and attached.

[Explanation of symbols]

 1 horizontal deflection coil 2 vertical deflection coil 3 separator 3a pointed protrusion 4a polishing core 5 gap between core and separator

Claims (1)

[Scope of utility model registration request] 1. A horizontal deflection coil and a vertical deflection coil,
In a deflection yoke composed of a separator for separating the two coils, a vertical deflection coil provided with a portion having no winding in the vertical and horizontal directions when viewed from the screen of a core whose inner surface is polished and a cathode ray tube, and a pointed outer coil. A deflection yoke, comprising: a separator having at least four protrusions.