JPH0735289Y2 - High frequency deflection yoke - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field This invention relates to deflection yokes for high density, high resolution monitors operating at high horizontal deflection frequencies such as 130 KHz.

[Prior Art] FIG. 4 is a front view of a conventional high-frequency deflection yoke, FIG. 5 is a front view of a magnetic core thereof, and FIG. 6 is a perspective view thereof. In the figure, (1) is a magnetic core (hereinafter referred to as "core"), and a plurality of grooves (2) are formed on its inner surface (1a) from the front edge (1b) to the rear edge (1c) of the central axis Z. It is formed axially symmetrically with a constant pitch in the circumferential direction and along the circumferential direction. (3) is a convex portion between the grooves (2), (4a) is a horizontal deflection coil, (4b) is a vertical deflection coil, (5) and (6) are the leading edge (1b) and the rear of the core (1). Guide grooves formed on the edge (1c) following the groove (2). The horizontal and vertical deflection coils (4a) and (4b) are the groove (2) and the guide grooves (5) and (6), respectively. The inner surface (1a) of the core (1) is wound so as to be housed in the groove (2).

In this way, the horizontal and vertical deflection coils (4a), (4b)
When each of them is housed in the groove (2), horizontal and vertical deflection coils (4a) and (4b) are generated by the high frequency horizontal deflection magnetic field.
The eddy current that occurs in the cathode decreases and the amount of heat generated decreases because the amount of heat generated decreases, and since the surface of the convex portion (3) between the grooves (2) approaches the neck of the cathode ray tube, the deflection sensitivity is increased and the driving power is reduced. Can be reduced.

[Problems to be solved by the invention] However, in this conventional deflection yoke, the groove (2) is held in the circumferential direction of the inner surface (1a) of the core (1) with a constant pitch from the trailing edge (1c). Since it is formed axially symmetrically across the front edge (1b), when it is attached to the cathode ray tube, the portion near the rear edge (1c), which is the neck side (hereinafter referred to as the "neck side"), and the funnel side. The winding distribution function with respect to the angle θ in the circumferential direction of the portion close to the leading edge (1b) (hereinafter, referred to as “funnel side”) cannot be changed so much. For this reason, it becomes difficult to adjust the deflection magnetic field distribution shapes on the neck side and the funnel side of the deflection yoke to the desired distribution shapes, and the color misregistration (misconvergence) on the screen of the cathode ray tube increases. There is a problem that it is difficult to correct the raster distortion on the screen into a square.

The present invention has been made to solve the above-mentioned conventional problems, and makes it possible to obtain a desired winding distribution on the funnel side while sufficiently suppressing an increase in heat generation amount and a decrease in deflection sensitivity. An object of the present invention is to provide a high-frequency deflection yoke capable of eliminating color misregistration and raster distortion.

[Means for Solving the Problems] A high-frequency deflection yoke according to the present invention has a trumpet shape in which one end has a small diameter and the other end has a large diameter, and a shaft is provided at a predetermined pitch in the circumferential direction of the inner surface on the small diameter side. A magnetic core having a plurality of grooves extending in the same direction and having the inner surface on the large diameter side formed into a flat surface, and horizontal and vertical deflection coils wound around the magnetic core. The coil side on the small diameter side is embedded and held in the groove, and the coil sides on the large diameter side of both the deflection coils are expanded in the circumferential direction to have a desired winding distribution. It is characterized by being wrapped.

[Operation] According to the present invention, the small-diameter side (neck side) of the horizontal / vertical deflection coils is housed and positioned in the groove formed on the inner surface of the core, and the coils are wound in the circumferential direction. While the line distribution is regulated, the large diameter side (funnel side) is not regulated, and it is possible to spread it in the circumferential direction and freely displace it. Therefore, by setting the winding distribution on the large diameter side to a desired deflection magnetic field distribution type, it is possible to obtain a deflection yoke with less color misregistration and raster distortion. In addition, the deflection coil part on the neck side, where the magnetic field is strong and a large amount of Joule loss occurs, is positioned and accommodated in the groove formed on the inner surface of the core. Even if it is wound on the upper side, the increase in Joule loss is small and no problem occurs as a measure against heat generation of the deflection yoke.

[Embodiment of the Invention] FIG. 1 is a front view of an embodiment of the present invention in which a vertical deflection coil is removed. FIG. 2 is a front view of the core, and FIG. 3 is a sectional view taken along the line III-III in FIG. In the figure, (7) is from the trailing edge (1c) to the leading edge (1) of the core (1).
Inner surface (1) in the range R of small inner diameter toward the middle part toward b)
In a), a convex portion formed by holding a predetermined pitch in the circumferential direction,
Reference numeral (8) is a groove formed between the convex portions (5), which is the core (1).
The front edge (1b) of is formed as a smooth surface. As shown in FIG. 1, the horizontal deflection coil (4a) is positioned such that the inner coil sides of the neck side are housed and positioned in the grooves (8), and the funnel side of each coil side is shown in the figure. As described above, the wire is wound around the core (1) so as to be expanded in the circumferential direction at the exit of the convex portion (7) and to have a desired winding distribution.

The vertical deflection coil (4b) is also the horizontal deflection coil (4a).
Similarly, the core (1) is wound so as to have a desired winding distribution.

In this way, since the convex portion (7) for regulating the positions of the horizontal / vertical deflection coils (4a) and (4b) is provided only within the range R where the inner diameter of the core (1) is small, both deflection coils (4a) , (4b)
It is possible to restrict the winding distribution on the net side of each of the above and to freely set the winding distribution on the funnel side.

When the horizontal / vertical deflection coils (4a) and (4b) are wound around the core (1) in this way, the winding distribution on the neck side can be restricted by the arrangement in which the convex portion (7) is formed, while Since the funnel side can be formed to have a desired winding distribution, the deflection magnetic field distributions on the neck side and the funnel side can be made into desired distribution shapes, respectively, and there is no color shift.
Moreover, a deflection yoke without raster distortion can be obtained.

In addition, the range F where the inner diameter of the inner surface (1a) of the core (1) is large
In addition, the decrease in the deflection sensitivity of the deflection yoke due to the fact that the horizontal deflection coil (4a) is not embedded in the core material without forming the convex portion is small. This is because the deflection magnetic field strength in the large inner diameter range F is weaker than the deflection magnetic field strength in the smaller inner diameter range R, and therefore, the decrease in the magnetic field strength caused by not providing the convex portion is slight, and the deflection yoke is small. This has a small effect on the deflection sensitivity of.

Also, for the same reason, since the jule loss on the funnel side of the horizontal deflection coil (4a) is also small, the jule loss increase by not embedding the coil side between the convex parts is also small, and no special heat generation measures are required. .

[Advantage of Invention] As described above, according to this invention, one end has a small diameter,
A magnetic core having a trumpet shape in which the other end has a large diameter, and forming a plurality of grooves axially extending at a predetermined pitch in the circumferential direction of the inner surface of the small diameter side, and molding the inner surface of the large diameter side into a flat surface. And a horizontal / vertical deflection coil wound around the magnetic core, the coil sides of the deflection coils on the small diameter side are embedded and retained in the groove, and the deflection coils of the deflection coil have the large size. Since the coil sides on the radial side are each wound in a circumferential direction to have a desired winding distribution,
It is possible to obtain a good high-frequency deflection yoke that is free from adjustment of winding distribution on the large diameter side and does not cause color misregistration and raster distortion while sufficiently suppressing reduction in deflection sensitivity and increase in heat generation. it can.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 3 are views showing this embodiment, FIG. 1 is a front view without a vertical deflection coil, FIG. 2 is a front view of a magnetic core thereof, and FIG. 2 is a sectional view taken along the line III-III in FIG. 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 perspective view thereof. (1) ... magnetic core, (1a) ... inner surface, (1b) ... leading edge, (1c) ... trailing edge, (4a) ... horizontal deflection coil, (4
b) …… Vertical deflection coil, (7) …… Convex part, (8) ……
groove. In the drawings, the same reference numerals indicate the same or corresponding portions.

Claims (1)

[Scope of utility model registration request] 1. A trumpet shape in which one end has a small diameter and the other end has a large diameter, and a plurality of grooves extending in the axial direction at a predetermined pitch in the circumferential direction of the inner surface on the small diameter side are formed, and the large diameter is formed. It has a magnetic core whose inner surface on the radial side is formed into a flat surface, and horizontal and vertical deflection coils wound around this magnetic core, and the coil sides on the small diameter side of both deflection coils are embedded and held in the groove. The high-frequency deflection yoke is characterized in that the coil sides on the large diameter side of the both deflection coils are respectively wound in a circumferential direction to have a desired winding distribution.