JPH0572694B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a deflection coil installed in a cathode ray tube of a television receiver or the like.

BACKGROUND TECHNOLOGY In recent years, deflection coils with reduced astigmatism and improved raster distortion have been developed. It is said that the other becomes worse and reaches a certain breaking point.

A conventional deflection coil will be explained below. FIGS. 3 and 4 are external views of one side of a conventional toroidal deflection coil divided into two parts.
Here, 11 is a core, 12 is a tail opening end, 13 is a head opening end, 15 is a conducting wire portion in which the electric wire 14 is continuously wound, and 16 is a space portion.

Further, in order to improve the vertical raster distortion and reduce astigmatism, the space 16 is formed so that its width becomes wider from the tail opening end 12 of the core toward the head opening end 13.

Further, as means for adjusting the magnetic field distribution created by the deflection coil configured in this manner, the following method is generally used.

: A method of increasing or decreasing the width of the conducting wire portion 15 and the space portion 16 that occupy the surface of the core 11 by adjusting the winding width of the conducting wire portion 15.

: A method for adjusting the wire density of the conductor portion 15.

Problems to be Solved by the Invention However, in the deflection coil configured as described above, since the space near the open end 13 of the core head is wide, raster distortion occurs as shown in FIG. 5 on the cathode ray tube screen. It appeared as a distortion. Also, in order to prevent this secondary distortion, it is possible to narrow the width of the space 16 near the core head opening end 13 as shown in FIG. 6, but in this case, the barrel magnetic field is near the core tail opening end 12. , the magnetic field distribution becomes a pink tension magnetic field near the head opening end 13, and changes from a pink tension magnetic field to a barrel magnetic field as it goes from the tail opening end 12 to the head opening end 13.
The so-called S-shaped misconvergence appears in astigmatism as shown in the figure.

The present invention has been made in view of such problems, and an object of the present invention is to provide a deflection coil that can improve S-shaped misconvergence.

Means for Solving the Problems In order to solve the above-mentioned problems, the deflection coil of the present invention divides the conductive wire into two parts at the tail open end in each of the upper and lower halves of the core and arranges them with a gap between them. At the open end of the head, the conductor part is divided into three parts, into a central conductor part and a pair of conductor parts at both ends, and a pair of wire bundles from the two conductor parts at the open end of the tail part to the conductor parts at both ends at the open end of the head part are divided into three parts. The distance between them widens toward the ends, and the central conductor section at the head opening end is made up of bundles of wires separated from the two conductor sections at the tail opening end.

Effect Since the deflection coil of the present invention has the above-described configuration, when the horizontal deflection angle of the electron beam is small (in the center of the screen), the central conductor portion exerts a pink tension type magnetic field influence on the electron beam, and the horizontal deflection angle is small. In a large state (both left and right ends of the screen), the conductive wire portions at both ends exert a barrel magnetic field influence on the electron beam, making it possible to correct S-shaped misconvergence.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of an embodiment of the deflection coil of the present invention, and FIG. 2 is a plan view of the same, showing one of the two divided cores.

In the figure, 1 is a core, 2 is a tail opening end, 3 is a head opening end, and 4 is an electric wire wound around the outer periphery of the core 1. 5a to 5e are conductor parts in which the electric wire 4 is continuously wound around the core 1, of which 5a and 5b are
are the conductor portions of the tail open end 2 of the core 1, 5c, 5d,
5e is a conductive wire portion at the open head end 3 of the core 1. In this way, the wire portion is divided into two parts at the tail opening end 2, and the conducting wire part is divided into three parts at the head opening end 3. The conductive wire portions 5c and 5e at both ends of the head opening end 3 are arranged near both ends of the core 1, apart from the central conductive wire portion 5d, respectively. In addition, the two conductive wire portions 5a at the tail opening end 2,
The distance between the pair of wire bundles from 5b to the conductor portions 5c and 5e of the head becomes wider as they move toward the head.
The central conducting wire portion 5d of the head opening end 3 is connected to the tail opening end 2.
It is formed by collecting wire bundles separated from the two conducting wire portions 5a and 5b. 6 is a space provided between each conducting wire portion. In this embodiment, this space 6 is composed of three spaces 6a, 6b, and 6c, and the spaces 6a and 6c are connected to the tail opening end 2.
The width of the space increases monotonically toward the head opening end 3, while the space 6b located between the two spaces 6a and 6c is closer to the head opening end than the tail opening end 2. The width of the space portion is formed so as to decrease monotonically toward 3. As can be seen from the above description, the space parts are arranged such that the width thereof becomes wider and the space part becomes narrower from the tail opening end 2 to the head opening end 3 alternately.

By configuring the deflection coil of this embodiment as described above, it has a barrel magnetic field near the tail opening end, which transitions to a pink tension magnetic field as it moves toward the head opening end, as in conventional deflection coils. In comparison, it is possible to create a free magnetic field distribution, and it is possible to provide a deflection coil that does not generate secondary distortion due to raster distortion and does not cause S-shaped misconvergence.

In this embodiment, a deflection coil having three spaces has been described as an example, but the number of spaces may be three or more.

Effects of the Invention As has been made clear from the above explanation, the deflection coil of the present invention has an electric wire wound toroidally around the outer circumferential surface of the core, and has two conductor portions at the open end of the tail in each of the upper and lower halves of the core. In addition, the conductor part is divided into three parts at the head opening end into a central conductor part and a pair of both end conductor parts, and the both end conductor parts are connected from the two conductor parts at the tail opening end to the both end conductor parts at the head opening end. The distance between the pair of wire bundles leading to the section widens toward the head opening end, and the central conductor section at the head opening end is composed of the wire bundles separated from the two conductor sections at the tail opening end. As a result, when the horizontal deflection angle is small, the central conductor section will have a pincushion type magnetic field effect on the electron beam, and when the horizontal deflection angle is large, the both end conductor sections will have a barrel type magnetic field effect on the electron beam. , S-shaped misconvergence can be corrected.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a deflection coil according to an embodiment of the present invention, Fig. 2 is a plan view showing the deflection coil of the same embodiment as seen from the open end of the core head, and Fig. 3 is a conventional deflection coil. 4 is a plan view of the conventional deflection coil, FIG. 5 is a diagram showing the raster distortion that appears on the cathode ray tube due to the conventional deflection coil, and FIG. 6 is a diagram of another conventional deflection coil. 7 is a diagram showing the S-shaped misconvergence that appears on the cathode ray tube due to the deflection coil shown in FIG. 6. DESCRIPTION OF SYMBOLS 1...Core, 2...Tail opening end, 3...Head opening end, 4...Electric wire, 5a to 5e...Conducting wire portion, 6...
...Space department.

Claims (1)

[Claims] 1. In a deflection coil formed by toroidally winding an electric wire around the outer circumferential surface of an annular core, in each of the upper and lower halves of the core, at the open end of the tail, the conductor is divided into two parts with a gap between them. At the open end of the head, the conductor part is divided into three into a central conductor part and a pair of conductor parts at both ends, and a pair of electric wires are connected from the two conductor parts at the open end of the tail part to the conductor parts at both ends at the open end of the head part. The distance between the bundles increases as they move toward the head opening end, and the central conductor section at the head opening end is characterized by a collection of wire bundles separated from the two conductor sections at the tail opening end. deflection coil.