JPS62154438A - Deflecting yoke for high frequency - Google Patents

Abstract

PURPOSE:To have a deflecting magnetic field of the desired distributed type as well as to reduce the extent of raster deformation, by setting the size of each groove to different sizes according to a position in a circumferential direction or a tube axial direction, and making the distributed type in the circumferential direction or that in the tube axial direction of horizontal and vertical deflecting magnetic fields into the desired distributed type. CONSTITUTION:Depths h1-h6 of each of grooves 21-26 are different in size according to a position in a circumferential direction, and also as to other quadrants, they are formed into X-axis and Y-axis symmetrical forms each, and each coil side of a horizontal deflecting coil 4a is housed in grooves 21-23 while of a vertical deflecting coil 4b is housed in grooves 24-26 and coiled respectively. thus, if circumferential groove depth is altered according to the circumferential direction, a deflecting magnetic field distributed type of the horizontal deflecting coil 4a comes to a pin cushion type being the strongest on the X-axis, while the deflecting magnetic field distributed type of the vertical deflecting coil 4b comes to a barrel type being the weakest on the Y-axis. And, as for the degree, size of each groove, namely, each sectional area is altered and winding numbers of the coil to be housed in the groove are altered whereby the deflecting magnetic distributed type in the circumferential direction is alterable to the desired form.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a deflection yoke for high density, high resolution monitors operating at high horizontal deflection frequencies, such as 180 KHz.

[Conventional technology]

FIG. 4 is a front view of a conventional high-frequency deflection yoke, FIG. 5 is a front view of its magnetic core, and FIG. 6 is a perspective view thereof. In the figure, (1) is a magnetic core (hereinafter referred to as a "magnetic core").

), and its inner surface (1a) has a plurality of grooves (2) along its leading edge (1
b) to the trailing edge (IC), they are formed axially symmetrically along the central axis direction 2 and at a constant pitch in the circumferential direction. (3) is the convex part between the grooves (2), (4a) is the horizontal deflection coil, (4b) is the @ direct deflection coil, (5) and (6) are the leading edge (1b) of the core (1) and The horizontal and vertical deflection coils (4a) and (4b) are divided into guide grooves formed on the trailing edge (IC) following the grooves (2), respectively, and each coil side is @(2). ) and guide groove (5)
, (6), and the core (1)
The inner surface (1a) of is wound so as to be accommodated in the groove (2).

In this way, the horizontal and vertical deflection coils (4a), (4
b) is arranged in each K groove (2), the horizontal and vertical deflection coils (4a
), (4b) decreases, the Joule loss decreases, the heating cover decreases, and the groove (2
), the surface of the convex portion (3) approaches the neck of the cathode ray tube, increasing deflection sensitivity and reducing driving power.

[Problem that the invention seeks to solve]

However, in this conventional deflection yoke, the groove (2) is
) with a constant pitch in the local direction of the inner surface (1a),
Since it is formed axially symmetrically from the rear edge (IC) to the front edge (1b), the part near the rear edge (IC) that becomes the neck side when installed in the cathode ray tube (hereinafter referred to as the "neck side"), The part near the front k (lb) on the funnel side (
The winding distribution function regarding the angle θ on the funnel side (hereinafter referred to as the “funnel side”) cannot be changed much. For this reason, it becomes difficult to adjust the deflection magnetic field distribution shapes on the neck side and funnel side of the deflection yoke to desired distribution shapes, respectively.
There were problems in that the color shift (misconvergence) on the screen of the cathode ray tube became large and it was difficult to correct the raster distortion on the screen to a square shape.

This invention was made in order to solve these problems, and is a high-frequency device that is capable of minimizing an increase in heat generation and a decrease in deflection sensitivity, and which allows the neck side to have a desired winding distribution shape. The purpose is to obtain a deflection yoke.

[Means for solving problems]

The deflection yoke according to the present invention is divided and wound around a core in which a plurality of grooves are formed extending at a predetermined pitch in the circumferential direction from the rear end of the inner surface to the middle part where the circular diameter increases. For a high-frequency deflection yoke I in which the neck sides of each coil side of a horizontal deflection coil and a vertical deflection coil are accommodated in the grooves, the size of each groove is determined by the position in the circumferential direction or in the tube axis direction. By making the magnetic fields different in size depending on the positions of the horizontal and vertical deflection coils, the distribution shapes of the horizontal and vertical deflection magnetic fields formed by the horizontal and vertical deflection coils can be formed into desired patterns.

[For production]

By changing the size of the groove that accommodates the horizontal and vertical deflection coils, the distribution shape of the deflection magnetic field in that area can be changed in either direction. Therefore, by changing the size of the grooves in the circumferential direction and the tube axis direction so as to obtain the desired deflection magnetic field distribution shape, the deflection magnetic field distribution shape on the neck side and the funnel side can be made into the desired distribution shape. You get a yoke.

[Embodiments of the invention]

FIG. 1 is a partially enlarged sectional view of an embodiment of the present invention, showing the first quadrant of a cross section taken perpendicular to the tube axis 2 at the center of the deflection yoke. In the diagram, (company) to (
E) is a groove whose depth h1 to h6 is h as shown in the figure.
l>h2>ha, and h4>bs>h6, the depths differ according to the circumferential position @ζ, and the other quadrants are also formed symmetrically on the X and Y axes, respectively. A horizontal deflection coil (4a) is housed in the grooves aυ to (to), and each coil side of the vertical deflection coil (4b) is housed and wound in the grooves (c) to 翺.

In this way, when the depth of the local groove is changed according to the circumferential direction, the deflection magnetic field distribution shape of the horizontal deflection coil (4a) becomes a bottle cushion shape, which is strongest on the X-axis, while the vertical deflection coil (4a) The deflection magnetic field distribution shape (4b) is the weakest on the Y axis. Moreover, the i degree can be changed to the desired shape by changing the size of each groove, that is, the cross-sectional area, and changing the number of turns of the coil housed in the groove. can.

FIG. 2 is a front view of a magnetic core according to another embodiment of the present invention.
! Figure 88 is a longitudinal sectional view of the core, the upper half from the 2nd axis is a sectional view taken along the line Inv-1uv in Figure 8, and the lower half is the 8th axis.
FIG. 111 is a sectional view taken along the line n-Innn.

In this embodiment, the depth of the groove (2) is different depending on the position in two directions of the tube axis, the neck side is deeper than the funnel side, and the front surface of the convex part (3) is closer to the tube axis. It is constructed so that it approaches 2.

In this way, as the protrusion (3) approaches the tube axis 2 on the neck side, the deflection magnetic field becomes stronger, and the distribution shape and deflection sensitivity of the deflection magnetic field can be changed.
In other words, by changing the distribution of the height of the convex portion in the tube axis direction and the circumferential direction, the deflection magnetic field distribution shape on the tube axis and in the circumferential direction can be made into a desired pattern. I can do it.

In addition, in each of the above embodiments, an example was shown in which the depth of the groove was changed and the size of the groove was changed, but the width of the groove may also be changed.
The selection may be made in consideration of ease of manufacturing the core (1) and ease of winding the deflection coil.

Further, although the valley grooves are formed parallel to the tube axis 2, it goes without saying that they may be inclined.

〔Effect of the invention〕

The present invention provides a high-frequency deflection yoke equipped with a magnetic core in which a plurality of grooves for accommodating the coil sides of horizontal and vertical deflection coils are formed in the tube axis direction from the rear edge to the front edge. The size of the groove is made different depending on the position in the circumferential direction or the tube axis direction, so that the distribution shape of the horizontal/vertical deflection magnetic field in the local direction or the distribution shape in the tube axis direction becomes the desired distribution shape. This feature makes it possible to obtain a high-frequency deflection yoke that has a deflection magnetic field with a desired distribution shape and has less color shift and raster distortion.

[Brief explanation of drawings]

FIG. 1 is a partially enlarged sectional view of one embodiment of the present invention, showing a cross section of the first quadrant perpendicular to the tube axis at the center of the deflection yoke, and FIG. 2 is a partially enlarged sectional view of one embodiment of the invention. Front view of the magnetic core,
Figure 3 is a longitudinal cross-sectional view of a deflection yoke using this core, the upper half is a cross-sectional view taken along the line ■7-■7 in Figure 2, and the lower half is a cross-sectional view taken along the line ■□-■8 in Figure 2. , Fig. 4 is a front view of a conventional high-frequency deflection yoke, Fig. 5 is a front view of its magnetic core, and Fig. 6 is a front view of a conventional high-frequency deflection yoke.
The figure is also a perspective view. (1)...Magnetic core, (1a)...Inner surface s (l
b)... Leading edge, (IC) -... Trailing edge, (2) , @
l) ~fi--Groove, (3)--Protrusion, (4a)-
...Horizontal deflection coil, (4b)...Vertical deflection coil. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (2)

[Claims] (1) A magnetic core with multiple grooves extending in the tube axis direction from the trailing edge to the leading edge at a predetermined pitch in the circumferential direction is formed on the inner surface, and the magnetic core is divided into horizontal and vertical deflectors. In a high-frequency deflection yoke in which each coil side of a coil is wound so as to be accommodated in each of the grooves, the sizes of the plurality of grooves are different depending on the position in the circumferential direction or the axial direction. 1. A high frequency deflection yoke, characterized in that the deflection magnetic field pattern formed by the horizontal and vertical deflection coils is formed in a desired shape. (2) The high frequency deflection yoke according to claim 1, wherein the size of the groove is changed by changing the depth or width of the groove.