JPH04341735A - Deflecting-yoke unit - Google Patents

Abstract

PURPOSE:To obtain such a deflecting-yoke unit that its neck side may be very accurately formed in a barrel magnetic-field, while its funnel side in a pincushion magnetic-field and also the performance of a deflecting yoke may be stabilized. CONSTITUTION:A semi-toroidal type deflecting yoke having a pair of saddle type horizontal deflecting coils and a pair of toroidal type vertical deflecting coils has slits 111 formed in the upper and lower parts of a core 11 round which vertical deflecting coils 121a, 121b are wound. Subsidiary vertical deflecting coils 122a, 122b are wound from the slits 111 to the large-diameter portion and then those coils are connected to a main vertical deflecting coil wound all over the core so as to form a pair of toroidal type vertical deflecting coils.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a deflection yoke device used in a cathode ray tube display device such as a color television receiver.

0002

2. Description of the Related Art FIG. 2A shows a perspective view of a typical deflection yoke. The insulating frame 1 is a bobbin having a small diameter part and a large diameter part. A saddle-shaped horizontal deflection coil (not shown) is installed inside the insulating frame 1, and a core 2 is installed outside.
A toroidal vertical deflection coil 3 that is directly wound is disposed. The core 2 has a trapezoidal conical shape with a small diameter portion and a trapezoidal portion so as to match the outer shape of the insulating frame 1, and has a trapezoidal conical shape that extends 2 in the axial direction.
The divided core halves are combined to form a trapezoidal cone shape.

In recent convergence-free deflection yokes, a barrel magnetic field is generally required for the vertical deflection magnetic field, and generally the vertical deflection coil 3 is connected to the core 2 as shown in FIG. The winding angle of the small diameter part and the winding angle of the large diameter part are
The same value θ1 is set to generate a predetermined magnetic field. However, in the case of such a deflection coil, the raster on the screen tends to cause left-right pincushion distortion, as shown in FIG. Note that the winding angle means the range in which the wire is wound when viewed in the circumferential direction from the central axis.

As a method for correcting such left-right pincushion distortion, the winding angle θ2 of the small diameter portion is made larger than the winding angle θ3 of the large diameter portion, as shown in FIG. There is a vertical deflection coil. In other words, this type of deflection yoke characteristic has a (strong) barrel magnetic field on the neck side and a pincushion magnetic field on the funnel side.

However, there are also problems with this deflection yoke. In other words, in a vertical deflection coil, it is difficult to wind the coil perpendicularly to the core, which causes winding slippage, which causes variations in deflection yoke performance. As a method to solve this winding slippage,
There is a technique shown in the publication. This technology is shown in the same figure (E).
As shown in the figure, the part where the winding is applied is inclined (angle θ4) to the core.
) (the core body is tilted or an auxiliary member is attached to the core) to prevent the winding from slipping.

However, if the core itself is sloped using this method, manufacturing variations in the core may become large. Furthermore, when attaching auxiliary members such as plastic to a flat core, the accuracy of the attachment becomes a problem. Another method for changing the vertical deflection magnetic field in the axial direction of the cathode ray tube is to stack the windings in the axial direction as shown in FIG. The core 2 is divided into three parts 2a, 2b, and 2c in the tube axis direction, and the windings are wound around each core at a predetermined angle and are finally assembled as one piece. ing. However, even in this deflection yoke, the manufacturing accuracy and mounting accuracy of the core are problematic.

[0007]

[Problems to be Solved by the Invention] According to the above-mentioned conventional deflection yoke, if the winding method or structure of the vertical deflection coil is devised in order to obtain an overall good magnetic field, the winding accuracy may be reduced. There are large variations in installation accuracy, which has a large impact on deflection yoke performance.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a deflection yoke device that can accurately form a barrel magnetic field on the neck side and a pincushion magnetic field on the funnel side, and can stably obtain deflection yoke performance. shall be.

[0009]

[Means for Solving the Problems] The present invention provides a semi-toroidal deflection yoke having a pair of saddle-shaped horizontal deflection coils and a toroidal-shaped vertical deflection coil, in which slits are provided above and below a core around which the vertical deflection coils are wound. A sub-vertical deflection coil is wound from this slit to the large diameter portion,
A pair of toroidal vertical deflection coils are formed by connecting to the main vertical deflection coil wound over the entire core.

0010

[Operation] By the above means, a pincushion magnetic field is formed by the subcoil wound around the funnel side Y-axis portion. Further, a barrel magnetic field is formed by the main coil wound at a predetermined angle over the entire tube axis direction. Overall, the vertical magnetic field becomes a barrel magnetic field. and 1
Since the winding is applied to each core and the core is wound vertically, a vertical deflection coil with less variation in winding can be obtained.

[0011]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1(A) shows an embodiment of the present invention,
Figure (B) is a plan view (cross-sectional view) seen from the inside. The magnetic core 11 has a trapezoidal conical shape with a small diameter portion and a trapezoidal portion, which is formed by combining the upper and lower core halves. This core 11 includes a pair of main vertical deflection coils 121a and 121b in the vertical (Y-axis) direction, a sub vertical deflection coil 122a,
122b is wound. Sub-vertical deflection coil 122a
, 122b are wound toward the large diameter portion of the core through the slit 111 formed in the core 11 and approximately perpendicularly to the core. In addition, the sub-vertical deflection coils 122a, 12
2b are main vertical deflection coils 121a and 121b, respectively.
It is located at the center of the division in the X-axis direction.

Since the magnetic fields generated by the sub-vertical deflection coils 122a and 122b are windings near the Y-axis,
), it becomes a pincushion magnetic field (as shown by the arrow). The main vertical deflection coils 121a, 121b are wound substantially perpendicularly to the core 11 at a predetermined winding angle to generate a barrel magnetic field. Figure (D) shows this state, and shows the overall winding angle α and the hollow part (if the winding pitch is larger than the peripheral part, winding can be done in this part)
The angle β is set to a predetermined angle, particularly the angle most advantageous for convergence performance. The arrow in the center represents the barrel magnetic field, and by combining the barrel magnetic field from the main vertical deflection coil and the pincushion magnetic field from the auxiliary vertical deflection coil, a barrel magnetic field is formed comprehensively and convergence-free is achieved. In addition, the deflection distortion of the screen (particularly left-right pincushion distortion) is corrected or reduced because the funnel side is formed in the direction of the pincushion magnetic field.

Therefore, depending on the relationship between convergence performance and deflection distortion, the positions and sizes of the core 11 and slit 111, the winding angle of the main vertical deflection coil 121, the hollow part angle,
Also, the winding angle of the sub-vertical deflection coil 122, etc. are appropriately set.

Although the general convergence-free deflection yoke has been described above, it can also be applied in combination with other systems. The point is that the sub-main vertical deflection coil generates a pincushion magnetic field on the funnel side to correct left and right pincushion distortion in particular, and the overall vertical deflection magnetic field does not necessarily have to be a barrel magnetic field.

[0016] According to this configuration, since the winding of the vertical deflection coil is applied almost perpendicularly to the core, there is little variation in the winding, which means that variation in the deflection yoke performance can also be reduced. . Further, the main vertical deflection coil and the sub vertical deflection coil may be connected in series or in parallel.

[0017]

[Effects of the Invention] As explained above, according to the present invention,
The neck side is used as a barrel magnetic field, and the vertical deflection magnetic field on the funnel side can be easily converted into a pincushion magnetic field.Moreover, since the winding is perpendicular to the core, variations in deflection yoke performance can be suppressed. It is possible to stably obtain accurate deflection yoke performance.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention;
) is a perspective view seen from the back, the same figure (B) is a sectional view, and the same figure (B) is a cross-sectional view.
C) is an explanatory diagram of the deflection magnetic field on the neck side, and (D) is an explanatory diagram of the deflection magnetic field on the funnel side.

FIG. 2 is a diagram showing a conventional deflection yoke device;
A) is a perspective view seen from the back, (B) is an explanatory diagram of the winding angle, (C) is an explanatory diagram of pincushion distortion, and (D) is an explanatory diagram of the winding angle. (E) is also an explanatory diagram of the winding angle, the same figure (
F) is an explanatory diagram showing a modified example of the winding.

[Explanation of symbols]

11...Core, 111...Slit, 121a, 121b...
Main vertical deflection coil, 122a, 122b...subvertical deflection coil.

Claims (1)

[Claims] 1. A semi-toroidal deflection yoke having a pair of saddle-shaped horizontal deflection coils and a toroidal-shaped vertical deflection coil, wherein a slit is provided above and below a core around which the vertical deflection coil is wound, and a large-diameter portion is formed through the slit. A deflection yoke device characterized in that a sub-vertical deflection coil is wound around the entire core and connected to a main vertical deflection coil wound over the entire core to form a pair of toroidal vertical deflection coils.