JPH0965352A - Cathode-ray tube device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the color cathode-ray tube device where the terrestrial magnetism correction efficiency is improved by a means which approximates a raster rotation correction coil to an electron beam. SOLUTION: A raster rotation correction coil 7 which is separated from and is made independent of a deflecting yoke 6 with respect to the tube axis of a color cathode-ray tube 1 is inserted to a funnel part 3 of the cathode-ray tube 1 so as to be placed in the front of an aperture part 6a of the deflecting yoke 6, and the peripheral edge of the raster rotation correction coil 7 is set to hook parts 8b of three or four retaining tools 8. The deflecting yoke 6 has retaining tools 8 inserted to the space between the funnel part 3 and the deflecting yoke 6, and its longitudinal position and angle to the tube axis of the color cathode-ray tube 1 are so obtained that the deflecting yoke 6 has most suitable position and attitude, and it is fixed by wedge-shaped pointed end parts 8a of retaining tools 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube device, and more particularly to a color cathode ray tube device in which a raster rotation correction coil is arranged separately from a deflection yoke.

[0002]

2. Description of the Related Art A front view showing a schematic structure of a color cathode ray tube device is shown in FIG. 4, and a partial enlarged view in the vicinity of a deflection yoke is shown in FIG.
Shown in Specifically, in the color cathode ray tube 11, the face panel portion 12, the funnel portion 13, and the neck portion 14 made of lead glass are joined and integrated by frit glass or the like, and the RGB fluorescent film is formed on the inner surface of the face panel portion 12. At the same time, the electron gun 15 is enclosed in the neck portion 14 while being positioned. On the other hand, the deflection yoke 16 is incorporated in the funnel portion 13 in an externally fitted state. The deflection yoke 16 causes the electron beam emitted from the electron gun 15 to scan while irradiating the electron beam emitted from the electron gun 15 onto the RGB fluorescent film on the inner surface of the face panel portion 12 via a shadow mask (neither is shown), and thus deflects the electron beam. Deflection yoke 1
6 must be attached to the funnel portion 13 at an optimum position and posture with high precision.

The deflection yoke 16 is attached and fixed to the funnel portion 13 by using a stopper 18 shown in FIG. The stopper 18 is made of a substantially wedge-shaped rubber-like elastic body, and has a pointed portion 18a having a tapered surface with an acute angle. When the deflection yoke 16 is assembled to the funnel portion 13 of the color cathode ray tube 11, the deflection yoke 16
The optimum position and posture of the color cathode-ray tube 11 is the front-rear position and angle with respect to the tube axis, and the stopper 18 is provided in the gap between the funnel portion 13 and the deflection yoke 16.
Is inserted, and the position and angle are determined by the stoppers 18.

On the other hand, the color cathode ray tube device is very susceptible to the influence of the earth's magnetism and appears as a raster inclination.
Generally, the color cathode ray tube device incorporates a magnetic shield called an inner shield (not shown) inside the color cathode ray tube 11 or, as shown in FIG.
The raster rotation correction coil 17 wound around the separator 17a is fixed to the front surface of the opening 16a in order to prevent the raster from changing due to the influence of the geomagnetism. In this way, color cathode ray tube devices such as television receivers and displays are designed to be as immune as possible to the effects of the earth's magnetism regardless of where they are installed.

[0005]

However, in the color cathode ray tube device as described above, the raster rotation correction coil 16 is fixed to the front end of the opening 16a of the deflection yoke 16. Therefore, it means that the raster rotation correction coil 16 is located far from the funnel portion 13 of the color cathode ray tube 11 and is far from the electron beam emitted from the electron gun 15, and the geomagnetic correction efficiency is low. In order to improve the geomagnetic correction efficiency, the current passed through the raster rotation correction coil 16 is increased. Therefore, power consumption increases. Therefore, the present invention has been proposed in view of the above problems, and an object of the present invention is to provide a means for bringing a raster rotation correction coil closer to an electron beam, and improve the geomagnetic correction efficiency.

[0006]

According to the present invention, a cathode ray tube is provided with a deflection means for deflecting an electron beam in horizontal and vertical directions and a raster rotating means for correcting the inclination of a raster with respect to the earth's magnetism in a funnel portion of the cathode ray tube. In the apparatus, there is provided a cathode ray tube device in which the deflection means and the raster rotation means are separated from each other.

Also provided is a cathode ray tube device in which the deflection means is a deflection yoke, the raster rotation means is a raster rotation correction coil, and the raster rotation correction coil is arranged in front of the opening of the deflection yoke.

Further, there is provided a cathode ray tube device in which the deflection yoke and the raster rotation correction coil are fixed by the same stopper.

Further, there is provided a cathode ray tube device in which the stopper is formed by a wedge-shaped tip portion and a hook portion.

[0010]

According to the above construction, the raster rotation correction coil is separated from the deflection yoke and is separated from the deflection yoke, so that the raster rotation correction coil can be mounted on the tube axis of the cathode ray tube from the reference position. The distance to becomes longer. This means that the raster rotation correction coil approaches the funnel portion of the cathode ray tube and the distance from the electron beam emitted from the electron gun becomes shorter. That is, the geomagnetic correction efficiency is improved, and the current flowing through the raster rotation correction coil can be reduced.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing a schematic structure of a color cathode ray tube device of the present invention, FIG. 2 is a partially enlarged view near a deflection yoke, and FIG. 3 is a perspective view of a stopper having a wedge-shaped tip portion and a hook portion. In the figure, 1 is a color cathode ray tube, 2 is a face panel portion, 3 is a funnel portion, 4 is a neck portion, 5 is an electron gun, 6 is a deflection yoke, 7 is a raster rotation correction coil, and 8 is a wedge-shaped tip portion 8a. It is a stopper having a hook portion 8b.

As described in the prior art, the color cathode ray tube device is very susceptible to the influence of the earth's magnetism and appears as a tilt of the raster. Therefore, as a countermeasure, the color cathode ray tube device is installed inside the color cathode ray tube 1. A magnetic shield called an inner shield is incorporated (not shown), and a raster rotation correction coil attached in close contact with the deflection yoke prevents fluctuations of the raster due to the influence of geomagnetism. The main object of the present invention is the raster rotation correction coil 7
The installation method and the installation position of. As shown in FIGS. 1 and 2, a raster rotation correction coil 7 is arranged and fixed at a predetermined distance in front of the opening 6a of the deflection yoke 6 in the funnel 3 of the color cathode ray tube 1.

In front of the opening 6a of the deflection yoke 6, a stopper 8 in which the peripheral edge of the raster rotation correction coil 7 wound around the separator 7a is inserted into a hook 8b is temporarily placed. In this case, the number of the stoppers 8 is usually 3 to 4, though it depends on the size of the cathode ray tube. Next, as shown in FIG. 2, the wedge-shaped tip portion 8a of the stopper 8 that has been temporarily placed is inserted into the gap between the funnel portion 3 and the deflection yoke 6. The front-rear position and angle of the deflection cathode 6 with respect to the tube axis of the color cathode-ray tube 1 are determined so that the deflection yoke 6 has an optimum position and posture, and the deflection yoke 6 is fixed by a wedge-shaped tip 8a of a stopper 8. That is, the deflection yoke 6 and the raster rotation correction coil 7 are firmly fixed and positioned by the 3 to 4 stoppers 8.

[0014]

As described above, according to the cathode ray tube device of the present invention, the raster rotation correction coil is separated from the deflection coil to be independent, and the raster rotation correction coil is attached to the hook portion of the stopper. As a result, the raster rotation correction coil comes closer to the funnel portion of the cathode ray tube, and thus comes closer to the electron beam emitted from the electron gun. That is, the current flowing through the raster rotation correction coil can be reduced,
Geomagnetic correction efficiency is improved. Therefore, power consumption is reduced. In addition, the deflection yoke and the raster rotation correction coil are
Since they can be fixed by the same stopper having a wedge-shaped tip and a hook, they can be easily attached.

[Brief description of drawings]

FIG. 1 is a front view showing a schematic structure of a color cathode ray tube device according to the present invention.

FIG. 2 is a partially enlarged view near the deflection yoke of FIG.

3 is a perspective view of the fastener of FIG.

FIG. 4 is a front view showing a schematic structure of a conventional color cathode ray tube device.

5 is a partially enlarged view of the vicinity of the deflection yoke of FIG.

6 is a perspective view of the stop of FIG.

[Explanation of symbols]

 1 Color Cathode Ray Tube 2 Face Panel Section 3 Funnel Section 4 Neck Section 5 Electron Gun 6 Deflection Yoke (Deflection Means) 7 Raster Rotation Correction Coil (Raster Rotation Means) 8 Stoppers 8a Tip 8b Hooks

Claims (4)

[Claims] 1. A cathode ray tube device having deflection means for deflecting an electron beam in horizontal and vertical directions and raster rotating means for correcting the inclination of a raster with respect to the earth's magnetism in a funnel portion of a cathode ray tube. A cathode ray tube device characterized in that it is separated from a raster rotating means. 2. The deflection means is a deflection yoke, the raster rotation means is a raster rotation correction coil, and the raster rotation correction coil is arranged in front of an opening of the deflection yoke. The cathode ray tube device according to claim 1. 3. The cathode ray tube device according to claim 2, wherein the deflection yoke and the raster rotation correction coil are fixed by the same stopper. 4. The cathode ray tube device according to claim 3, wherein the stopper is formed by a wedge-shaped tip and a hook.