JP2003007225A - Deflection yoke - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deflection yoke that reduces dispersion of misconvergence on a screen, by reducing circumferential positional dispersion of vertical coil wire. SOLUTION: The deflection yoke comprises a screen side horizontal coil bobbin 1 having a funneled shape, a horizontal coil formed by a winding of wire inside the horizontal coil bobbin 1, a ferrite core 14 arranged outside the horizontal coil, a vertical coil bobbin 12 mounted on the ferrite core 14, the vertical coil wire 13 formed via the vertical coil bobbin 12, and a guide means 3 arranged outside the screen side horizontal coil bobbin 1, to restrain the circumferential position of the vertical coil wire.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke used in a color cathode ray tube.

[0002]

12 is an exploded view of a conventional coil assembly by section winding, FIG. 12 (a) shows a horizontal coil bobbin 2 on the neck side, FIG. 12 (b) shows a vertical coil bobbin assembly 11, and FIG. Is a projecting rib on the crossover on the screen side, and 16 is a projecting rib on the crossover on the neck side. FIG. 12C shows a screen side horizontal coil bobbin 31 having a shape similar to the funnel shape. Conventionally, as shown in FIGS. 12 (a), 12 (b) and 12 (c), the coil assembly of the deflection yoke is a combination of a screen side horizontal coil bobbin 31, a vertical coil bobbin assembly 11, and a neck side horizontal coil bobbin 2 as shown by arrows in FIG. The horizontal coil and the vertical coil were formed by the section winding. FIG. 5 is a front view of a conventional vertical coil bobbin assembly 11, and FIG. 6 is a side view showing a partial cross section thereof. In FIGS. 5 and 6, 12 is a vertical coil bobbin, 13 is a vertical coil wire wound around the vertical coil bobbin 12, 14 is a ferrite core mounted on the vertical coil bobbin 12, and 15 is a projection on the screen side crossing portion for section winding. Similarly, ribs 16 are protrusion ribs on the neck side transition part. Conventionally, the vertical coil wire 13 is merely positioned along both ends of the vertical coil bobbin 12, that is, along the inner surfaces of the projecting ribs 15 and 16 and the ferrite core 14 on the screen side and the neck side crossing portion, and the vertical coil wire 13 is vertically aligned when wound. There was an inherent factor of variation in the arrangement position of the coil wire rod 13 (for example, Japanese Patent Laid-Open No. 7-
45213).

[0003]

In the conventional deflection yoke as described above, the vertical coil wire 13 has the protruding ribs 15 on the screen side and the neck side crossing portion of the vertical coil bobbin 12,
Although the positioning in the circumferential direction has been performed by 16, the vertical coil wire 13 is wound with a large number of vertical coil wires 13 from the section between the same protruding ribs 15 and 16.
Since the bundle of No. 2 is formed in a ridge shape, the positions of the individual vertical coil wire rods 13 are varied in the circumferential direction of the ferrite core 14 due to variations due to winding. This variation in the arrangement position causes misconvergence variation and screen distortion variation on the screen of the cathode ray tube.

Next, the effect of misconvergence will be specifically described. FIG. 8 is a schematic front view of the vertical coil bobbin 12, in which the wound vertical coil wire rods 13 are radially arranged. When the vertical coil wire 13 is displaced from the regular position in the direction of the arrow in FIG. 8, misconvergence is caused in the vertical line on the screen 21 of the cathode ray tube as shown in FIG. There is a problem that the blue B is divided to the left and the red G is divided to the right.

FIG. 10 is a schematic front view of the vertical coil bobbin 12, and shows the case where the wound vertical coil wire 13 is displaced from the regular position in the direction of the arrow in FIG. In this way, misconvergence is caused in the vertical line on the screen 21 of the cathode ray tube, and the green R is centered around the red R
Was divided into the left direction and blue B was divided into the right direction. SUMMARY OF THE INVENTION It is an object of the present invention to reduce misconvergence and variation of vertical lines on a cathode ray tube screen, to obtain a deflection yoke of good quality, stable and easy to manufacture.

[0006]

A deflection yoke according to the present invention is a screen-side horizontal coil bobbin having a shape similar to a funnel shape, and a horizontal coil formed by winding a wire on the inside of the horizontal coil bobbin. A ferrite core provided outside the horizontal coil, a vertical coil bobbin attached to the ferrite core, a vertical coil formed through the vertical coil bobbin, and a vertical coil circle provided outside the screen side horizontal coil bobbin. A guide means for restraining the circumferential position is provided.

The deflection yoke according to the present invention is characterized in that the guide means is a plurality of rim guides integrally formed on the outside of the horizontal coil bobbin.

The deflection yoke according to the present invention is characterized in that the guide means is a plurality of projecting pins integrally formed on the outside of the horizontal coil bobbin.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. FIG. 1 is a perspective view of a horizontal coil bobbin. FIG. 2 is a side view showing a partial cross section thereof. 1 and 2, 1 is a screen-side horizontal coil bobbin having a shape similar to a funnel shape, 2 is a neck-side horizontal coil bobbin (not shown in FIG. 2), and 3 is provided outside the screen-side horizontal coil bobbin 1. It is a rim guide which is a guide means for restraining the circumferential position of the vertical coil wire. Rim guide 3
In order to reduce the positional variation of the vertical coil wire 13, as shown in the figure, a plurality of ridges are formed in the axial direction outside the horizontal coil bobbin 1 on the screen side, and are formed like a mountain to be restrained in the circumferential direction. The rim guide 3 is used when a molded product of the horizontal coil bobbin 1 is manufactured by modifying a conventional mold.
Since it is integrally formed, it has an advantage that it can be easily provided, and it is not necessary to change other parts.

FIG. 7 is a side view of the components constituting the coil assembly, FIG. 7 (a) is a neck side horizontal coil bobbin, FIG. 7 (b) is a vertical coil bobbin assembly 11, and FIG. 7 (c) is a screen side. The horizontal coil bobbin 1. The assembling of the coil assembly is completed by inserting the vertical coil bobbin assembly 11 into the back surface of the screen side horizontal coil bobbin 1 and then sandwiching it with the neck side horizontal coil bobbin 2.

The deflection yoke according to the first embodiment having the above-mentioned structure is provided outside the horizontal coil bobbin 1 on the screen side.
Since a plurality of rim guides 3 are installed, the position of the vertical coil wire 13 wound inside the vertical coil bobbin assembly 11 on the horizontal coil bobbin is restricted particularly by the presence of the rim guide 3 in the circumferential direction. become.
That is, as shown in FIG. 7, the rim guide 3 of the screen side horizontal coil bobbin 1 is connected to the vertical coil bobbin assembly 1 as shown in FIG.
When 1 is pressed, the vertical coil wire 13 shown in FIG. 5 is divided into bundles, and the position of the vertical coil wire 13 in the circumferential direction is restricted. Therefore, according to the first embodiment, it is possible to reduce the variation due to the positional deviation of the vertical coil wire rod 13, and to arrange the vertical coil wire rod 13 at the design target position, and thus the magnetic field distribution of the regular design target. It is possible to obtain a cathode ray tube of good quality, stable and easy to manufacture, by reducing misconvergence and variation of vertical lines on the screen of the cathode ray tube.

Embodiment 2. In the deflection yoke according to the second embodiment, in order to reduce the positional variation of the vertical coil wire rod 13, a protrusion, for example, a pin-shaped protrusion pin, is a guide means for restraining the position of the vertical coil wire rod on the outside of the screen side horizontal coil bobbin 1. 4 is provided. In FIGS. 3 and 4, a plurality of protruding pins 4 are provided outside the horizontal coil bobbin 1 on the screen side. This horizontal coil bobbin is shown in FIG.
The position of the vertical coil wire rod 13 wound inside the vertical coil bobbin assembly 11 shown in FIG. 1 is constrained particularly in the circumferential direction by the presence of the protruding pin 4. That is, the protruding pin 4 of the screen side horizontal coil bobbin 1
However, when the vertical coil bobbin assembly 11 is pressed as shown in FIG. 7, the vertical coil wire rods are divided between the bundles of the vertical coil wire rods 13 shown in FIG.

According to the second embodiment as well, the position of the vertical coil wire rod 13 of the vertical coil bobbin assembly 11 can be restrained in the circumferential direction, and the positional variation with respect to the regular design position can be suppressed.

The variation of the magnetic field generated by the vertical deflection system can be reduced, the magnetic field produced by the vertical deflection system can be obtained according to the design target, and the variation of misconvergence of the vertical lines on the screen of the cathode ray tube can be suppressed. .

[0015]

As described above, according to the present invention,
It is possible to reduce the positional deviation of the vertical coil wire, and to arrange the vertical coil wire at the design target position, that is, it is possible to easily obtain the magnetic field distribution of the regular design target. It is possible to obtain a deflection yoke having good quality, stable, and easy to manufacture by reducing misconvergence and variation of vertical lines on the screen.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment.

FIG. 2 is a partial cross-sectional side view showing the first embodiment.

FIG. 3 is a perspective view showing a second embodiment.

FIG. 4 is a partial cross-sectional side view showing a second embodiment.

FIG. 5 is a front view of a vertical coil bobbin assembly.

FIG. 6 is a partial cross-sectional side view of a vertical coil bobbin assembly.

FIG. 7 is an exploded view of components that make up the coil assembly.

FIG. 8 is a variation diagram of the position of the vertical coil wire.

FIG. 9 is a pattern diagram of misconvergence.

FIG. 10 is a variation diagram of the position of the vertical coil wire.

FIG. 11 is a pattern diagram of misconvergence.

FIG. 12 is an exploded view of a coil assembly showing a conventional example.

[Explanation of symbols]

1 horizontal coil bobbin, 2 horizontal coil bobbin, 3
Rim guide, 4 protruding pins, 11 vertical bobbin assembly, 12 vertical coil bobbin, 13 vertical coil wire rod,
14 ferrite core, 15 transition ribs, 16
Projection ribs at the transition, 18 coil assemblies, 21 cathode ray tube screens, 31 horizontal coil bobbins.

Claims (3)

[Claims] 1. A screen-side horizontal coil bobbin having a shape similar to a funnel shape, a horizontal coil formed by winding a wire on the inside of the horizontal coil bobbin, and a ferrite core provided outside the horizontal coil. A vertical coil bobbin attached to the ferrite core, a vertical coil wire formed through the vertical coil bobbin, and provided outside the screen side horizontal coil bobbin,
A deflection yoke, comprising: a guide means for restraining the circumferential position of the vertical coil wire. 2. The deflection yoke according to claim 1, wherein the guide means is a plurality of rim guides integrally formed on the outside of the horizontal coil bobbin. 3. The deflection yoke according to claim 1, wherein the guide means is a plurality of projecting pins integrally formed on the outside of the horizontal coil bobbin.