JPH0127559Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a deflection coil that has a toroidal-wound vertical deflection coil and a saddle-shaped horizontal deflection coil, and is installed in an in-line color cathode ray tube such as Trinitron (registered trademark).

In FIG. 1A, 1 is a color cathode ray tube, 2 is a toroidally wound vertical deflection coil, 3 is a hollow-shaped horizontal deflection coil, 4 is a funnel-shaped core, and 5 is a separator. With this configuration, as shown in FIG. 1B, in the tube axis (z-axis) direction of the color cathode ray tube 1, the magnetic field distribution of the vertical deflection magnetic field is made pin-shaped on the panel side and barrel-shaped on the neck side. It is known that raster distortions such as convergence and pincussion distortions can be improved. As a method for realizing such a magnetic field distribution, the methods described below have conventionally been proposed.

A method in which the basic magnetic field of the vertical deflection coil 2 is a barrel magnetic field, and a magnet is provided on the panel side of the deflection coil to generate a pin-shaped magnetic field.

A method of changing the magnetic field by winding a vertical deflection coil at an angle.

A method in which the basic magnetic field of the vertical deflection coil is a barrel magnetic field, and a magnetic piece is added to the panel side to generate a pin magnetic field (front cross arm).

A method in which the basic magnetic field of the vertical deflection coil is pin-shaped and a magnetic piece is added to the neck side to generate a barrel magnetic field (rear cross arm).

Let the basic magnetic field of the vertical deflection coil be the intermediate magnetic field,
A method in which a magnetic piece is added to the panel side to generate a pin magnetic field, and a magnetic piece is added to the neck side to generate a barrel magnetic field.

This invention further improves the methods of and described above. Generally, as shown in FIGS. 2A and 2B, the vertical deflection coil 2 is
A magnetic piece 6 is provided between the separator 5 and the separator 5. As is clear from FIG. 2A, the magnetic pieces 6 are provided on the upper and lower sides, respectively. In this case, vertical deflection coil 2
In order to insert the magnetic piece 6 into the gap between the separator 5 and the separator 5, a metal magnetic material such as a silicon steel plate with a thickness of 1 mm or less is used as the magnetic piece 6. For this reason,
If the magnetic field correction amount is small, that is, the magnetic piece 6 is small, there will be little actual damage, but if the magnetic piece 6 is made larger and the correction amount is increased, the eddy current generated by the horizontal deflection magnetic field will increase, resulting in power loss, heat generation, and eddying. A problem arises in that misconvergence due to the magnetic field generated by the current increases.

This invention aims to solve such problems. In this invention, a material with high electrical resistance such as ferrite, a molded core made of ferrite powder hardened with resin, or magnetic rubber is used as the magnetic piece. For example, since ferrite is a sintered body, it is difficult to make it thin, resulting in a large thickness. Therefore, in this invention, magnetic pieces are arranged within the window width of the saddle-shaped horizontal deflection coil 3 and approximately along the inner circle thereof. In addition, since a thick magnetic piece is used, the horizontal deflection magnetic field becomes barrel-shaped, causing coma aberration. Therefore, the window width of the horizontal deflection coil is made wider than before, making it pin-shaped. As a result, the horizontal deflection The magnetic field is an intermediate magnetic field.

Hereinafter, one embodiment of this invention will be described with reference to FIG. 3. In the figure, 7 indicates a window of the horizontal deflection coil 3, and a ferrite magnetic piece 8 is arranged in the inner circle of this window 7. In this case, separator 5
The portion that covers the window 7 may be made to protrude outward, and the ferrite magnetic piece 8 may be placed inside this inner recess and attached using adhesive or the like.

Further, as shown in FIG. 4, by extending the separator 5 to the outside to match the window 7 and removing the thickness of the separator 5, the thickness of the ferrite magnetic piece 8 can be increased accordingly. Manufacturing becomes easier. In this case, as shown in Figure 5,
A concave groove 9 is formed on the end face of each corner of the ferrite magnetic piece 8.
The end face of the separator 5 may be fitted into this groove 9 to facilitate attachment of the ferrite magnetic piece 8.

Furthermore, when the width of the ferrite magnetic piece 8 is considerably smaller than the width of the window 7 of the horizontal deflection coil 3,
As shown in FIG. 6, the separator 5 may be made to protrude inward to the position of the inner circle of the horizontal deflection coil 3, and a small width ferrite magnetic piece 8 may be attached to the outer surface of the separator 5.

As can be understood from the description of the above embodiments, according to this invention, a molded core made of ferrite or ferrite powder hardened with resin or a magnetic piece is used as a magnetic piece to make the vertical deflection magnetic field barrel-shaped on the neck side. Since a material with high electrical resistance such as rubber is used, almost no eddy current is generated by the horizontal deflection magnetic field, and power loss due to eddy current is avoided.
Generation of unnecessary magnetic fields that cause heat generation and misconvergence can be prevented. In addition, this idea uses a thick magnetic piece, which makes it possible to use a sintered body such as ferrite, and also positions this magnetic piece in the magnetic path of the horizontal deflection magnetic field, creating a gap. can be made substantially small, and the deflection efficiency can be improved.

Note that a mold core made of ferrite powder hardened with resin or magnetic rubber may be used as the magnetic piece.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram used to explain the magnetic field distribution on the tube axis of the vertical deflection magnetic field, Fig. 2 is a cross-sectional view and longitudinal cross-sectional view of a conventional deflection coil to which this invention can be applied, and Fig. 3 is a cross-sectional view of one embodiment of this invention, FIGS. 4 and 5 are cross-sectional views and partial perspective views of another embodiment of this invention, and FIG. 6 is a cross-sectional view of yet another embodiment of this invention. FIG. 2...Vertical deflection coil, 3...Horizontal deflection coil, 5
... Separator, 7... Window, 8... Ferrite magnetic piece.

Claims (1)

[Scope of Claim for Utility Model Registration] In a deflection coil that has a toroidal-wound vertical deflection coil and a saddle-shaped horizontal deflection coil and is attached to an in-line color cathode ray tube, the deflection coil is located at each of the upper and lower positions near the neck portion, Within the window width of the horizontal deflection coil, a magnetic piece with high electrical resistance made of a molded core made of ferrite or ferrite powder hardened with resin, or magnetic rubber, etc. is arranged approximately along the inner circle of the window width, and the convergence and raster A color cathode ray tube deflection coil designed to improve distortion.