JPH0343941A - Deflection yoke - Google Patents

Abstract

PURPOSE:To prevent rise in temperature of a deflection yoke for obtaining highly precise images by attaching black heat radiating substance on the surface of at least a part of the deflection yoke. CONSTITUTION:In a deflection yoke 1A, black heat radiating substance 3 wherein coloring heat radiant such as carbon black and adhesive are mixed is applied by spraying or the like and dried to be attached on an entire face of a cylindrical yoke core 1a made of ferrite. A horizontal and vertical deflection coil 1b is wound along the side of this yoke core 1a while an approximately ring-like separator 1c comprising a synthetic resin mold is attached from the both end faces of the yoke core 1a, Further, the deflection yoke 1A is installed at a neck of an image receiving tube 2 and is used with sawtooth current flowed to the deflection coil 1b while electron beam is deflected laterally and vertically. Thus heat radiating effect can be improved by the black heat radiating substance 3 thereby preventing temperature rise of the deflection yoke 1A as well as increasing electron beam scan frequency to obtain highly precise images.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a deflection yoke for a picture tube used in televisions, display monitors, and the like.

[Conventional technology]

Figure 4 shows a conventional deflection yoke, which is composed of parts such as 1 the deflection yoke, 2 the picture tube, 1a the yoke core, 1b the deflection coil, and 1c the separator and substrate. It is used by being attached to the neck of the tube 2. The deflection coil 1b of the picture tube 2 consists of two sets of vertical and horizontal coils, and when a sawtooth current for vertical and horizontal scanning is passed through this, the electron beam is deflected vertically and left and right, and a raster image is formed on the picture tube 2. can be drawn.

[Problem to be solved by the invention]

In conventional deflection yokes, when the scanning frequency of the electron beam is increased to improve image accuracy, the amount of heat generated in the yoke core and deflection coil increases, the temperature of the yoke core increases, the deflection efficiency decreases, and the image quality increases. The disadvantage of this method is that the images are distorted, which has been an obstacle to improving the precision of images.

This invention was made to solve the above-mentioned problems. It prevents the temperature rise of the deflection yoke, makes it possible to increase the scanning frequency of the electron beam, and makes it possible to obtain highly accurate images. The purpose is to obtain a deflection yoke for a picture tube.

[Means to solve the problem]

Therefore, the deflection yoke according to the present invention has a yoke core, a deflection coil, a separator, etc.
The above object is achieved by having a feature in which a black heat dissipating substance is attached to the surface of at least a portion of the deflection yoke by spraying or brush painting.

[Effect]

In this invention, the heat dissipating substance attached to the deflection yoke enhances the heat dissipation effect of heat generated from the yoke core, the deflection coil, etc., and reduces the temperature rise of the deflection yoke.

〔Example〕

FIG. 1 is a side view of a deflection yoke according to an embodiment of the present invention attached to a picture tube, FIG. 2 is a partial cross-sectional view of a Yoku core with a black heat dissipating substance adhered to the entire surface of an embodiment of the present invention, and FIG. FIG. 3 is a side view of a yoke core partially coated with a black heat dissipating material according to another embodiment of the present invention.

In the figure, IA is a deflection yoke according to the present invention, 3 is a black heat dissipating material, and other components that are the same (equivalent) to the conventional example shown in FIG. I have omitted the details.

The details of the adhesion structure of the above-mentioned black heat dissipating substance 3 are shown below.

In the deflection yoke IA shown in the embodiment of the present invention, as shown in the partial cross-sectional view of FIG. A black material with a large radiation coefficient obtained by mixing the above is applied as a black heat dissipating material 3 by spraying or the like, and then dried. Horizontal and vertical deflection coils 1b are arranged along the sides of this yoke core 1a.
The deflection yoke IA, which is completed as shown in FIG. attached to the deflection coil 1
It is used by passing a sawtooth wave current through b and deflecting the electric f beam left and right and up and down.

In the deflection yoke IA according to the present invention, as shown in FIG. 2, a black heat dissipating material 3 with a large radiation coefficient is attached to the entire surface of the yoke core 1a, so that the heat conducted from the picture tube 2 during use is reduced. The radiation of heat generated when a current is passed through the deflection coil 1b is improved, and the heat radiation effect is enhanced.

Next, FIG. 3 shows a black heat dissipating material 3 on at least a portion of the surface of the yoke core 1a that facilitates the heat dissipation effect of the yoke core 1a in another embodiment.
An example with attached is shown below. That is, in this embodiment, the yoke core 1 is attached to the yoke core 1a along the exposed partial portions that are not covered by the pair of deflection coils 1b attached to the yoke core 1a.
A black heat dissipating substance 3 is attached in a band shape which is approximately parallel to the cylindrical axis direction of a and is symmetrical from front to back. Even if the heat dissipating substance 3 is attached only to a portion in this way, a considerable heat dissipation effect can be obtained.

Furthermore, depending on the size, shape, and structure of the deflection yoke IA, which is determined by the size of the picture tube 2 used, this blackish heat dissipating material 3 may be applied to the deflection coil 1b, separator IC, etc. in addition to the yoke core 1a, similar to the yoke core 1a. If they are attached, they may have a synergistic effect.

Further, the attachment of the heat dissipating substance 3 is not limited to spraying, brush painting, etc., but may also be done by impregnation, etc., and it may be applied to each individual component before assembling the deflection yoke IA, or it may be applied to each individual component before assembling the deflection yoke IA. It may be carried out later.

〔Effect of the invention〕

As shown in E-E, according to the present invention, the heat dissipation effect is enhanced by the black heat dissipating material, preventing the temperature rise of the deflection yoke, making it possible to increase the scanning frequency of the electron beam, and producing highly accurate images. We can provide a deflection yoke that allows you to obtain

[Brief explanation of drawings]

FIG. 1 is a side view of a deflection yoke according to an embodiment of the present invention attached to a picture tube, and FIG. 2 is a partial cross-sectional view of a yoke core with a black heat dissipating material adhered to the entire surface of an embodiment of the present invention.
FIG. 3 is a side view of a yoke core to which a black heat dissipating material is partially attached according to another embodiment of the present invention, and FIG. 4 is a side view of a conventional deflection yoke attached to a picture tube. IA... Deflection yoke 1a according to this invention...
. . . Yoke core lb - . . . Deflection coil 1c . . . Separator 3 . . . Black heat dissipating material. In each figure, the same reference numerals indicate the same elements. (equivalent) Configuration requirements

Claims (1)

[Claims] 1. A deflection yoke having a yoke core, a deflection coil, a separator, etc., characterized in that a black heat dissipating substance is attached to at least a part of the surface of the deflection yoke.