JPS6280945A - Deflection device - Google Patents

Abstract

PURPOSE:To enable the correction of the raster distortion without arising of misconvergence by arranging at least four magnets in the vicinity of the front bend-up portion of a horizontal deflection coil so as the magnetization direction of the magnets is same to that of the tube axis. CONSTITUTION:In the rear side of the magnets 51-54 a magnetic field is generated which is same pattern and opposite direction to the magnetic field HB, but as the magnetic field is by-passed by the core 30 of magnetic substance placed behind the magnet, so the effect of the magnetic field is reduced. In the concrete the separator 60 can be used, in which the recessed portions 61-64 are provided at the location corresponding to the front bend-up portion of the horizontal deflection coil, and the magnets 51-54 are attached to these recessed portions respectively. By using the separator 60 like this, such effects can be obtained that the locating of the magnets 51-54 for attaching is easy and the magnets are difficult to fall off. Thereby the magnetic field in the direction of the tube axis and perpendicular to the tube axis can be generated to correct the raster distortion without arising of misconvergence.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a deflection device for an in-line color cathode ray tube, and particularly to one equipped with a correction magnet.

B1 Summary of the Invention The present invention is a deflection device for an in-line color cathode ray tube equipped with a correction magnet, which prevents misconvergence by forming a magnetic field in the tube axis direction and a magnetic field perpendicular to the tube axis. This allows raster distortion to be corrected.

C1 Prior Art Conventionally, for example, in-line color cathode ray tubes have been used in television receivers and the like.

In the color cathode ray tube mentioned above, the distance from the center of deflection of the fluorescent surface increases as it goes to the periphery, and when the electron beam is deflected, the deviation of the deflection becomes maximum at the farthest four corners. As shown in the figure, the raster 101 is distorted in a so-called pincushion shape. Such raster distortion is usually corrected by using a deflection device provided with a magnet (see Japanese Utility Model Publication No. 58-29898, etc.). That is, for vertical distortion as shown in FIG. 4, the separator 102 as shown in FIG.
A deflection device is used which includes rod-shaped magnets L-103 and L-104 magnetized in the longitudinal direction at positions above and below. Note that the separator 102 separates the horizontal deflection coil 105 and the vertical deflection coil (not shown).

D3 Problems to be Solved by the Invention Although raster distortion can be corrected by using the deflection device as described above, as shown in FIG.
In the middle region of the screen 106, a convergence shift in the vertical direction, so-called misconvergence, occurs, and the red electron beam Ba and the blue electron beam B
The trajectory of the electron beam B no longer matches the trajectory of the green electron beam BG. This is considered to be because a magnetic field similar to a distorted magnetic field, a so-called pin magnetic field Hp, for the vertical deflection coil as shown in FIG. 7 is generated locally.

The present invention was proposed in view of the above-mentioned conventional problems, and an object of the present invention is to provide a deflection device for an in-line color cathode ray tube that can correct raster distortion without causing misconvergence. do.

Means for Solving the E0 Problem In order to achieve the above-mentioned objects, the deflection device of the present invention has the following features:
In a deflection device for an in-line color cathode ray tube having a horizontal deflection Koinope vertical deflection coil and a separator for separating the horizontal deflection coil and the vertical deflection coil, at least It is characterized by arranging four magnets so that the magnetization direction is in the tube axis direction.

Another feature of the present invention is that in the deflection device having the above-mentioned features, the separator has a recess formed at a position corresponding to the front bend-up portion of the horizontal deflection coil, and the magnet is placed in the recess. It consists of installing it.

20 Effects According to the present invention, a magnetic field in the direction of the tube axis and a magnetic field in the direction perpendicular to the tube axis are generated by the magnet.

G. Example Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 (5) is a partially cutaway side view schematically showing the deflection device of this embodiment, and FIG. 1 (2) is a front view as well. The separator 10 has flange portions 11A and 11B at both ends, and is formed to expand in diameter from the flange portion 11B toward the flange portion 11A. A horizontal deflection coil 20 is wound around the inner peripheral surface of the separator 10 in a hollow shape, and the flange portion 11A side has a front bend-up portion 21A.
, the flange portion 11B side is the rear bend-up portion 21B (!
: It has become. Further, a core 30 formed into an annular shape by joining a pair of semi-annular cores is provided on the outer periphery of the separator 10, and a vertical deflection coil 40 is wound around the core 30. The vertical deflection coil 40 and the horizontal deflection coil 20 are arranged at substantially right angles to each other.

Further, the front bend-up portion 2 of the horizontal deflection coil 20 is
There are four magnets 51, 52, 53 near 1A.
, 54 are arranged symmetrically.

As shown in FIG. 2, the magnets 51, 52, 53, and 54 each have a rectangular parallelepiped shape and are magnetized in the thickness direction. That is, the magnet 51.5
2, 53, and 54 are arranged so that the magnetization direction is in the tube axis direction. Furthermore, when viewed from the panel side when attached to a cathode ray tube (not shown), as shown in FIG. Each is installed so that

In the deflection device of this embodiment having such a configuration,
Regarding the magnets 51, 52, 53, 54, a magnetic field HA (magnetic flux) in the tube axis direction as shown in FIG. 1 (5) is formed for each magnet, and the magnets 51, 52
For questions and magnets between 53° and 54, see Figure 1 CB.
A magnetic field Ha in a direction perpendicular to the tube axis as shown by + is formed. Of the above two types of magnetic fields, the magnetic field Ha is equivalent to the magnetic field generated by the conventional bar-shaped magnets 1-103 and 104 shown in FIG. 5, and the raster distortion can be corrected by this magnetic field HB. Additionally, as a result, misconvergence begins to occur, but the magnetic field HA in the tube axis direction applies rotational force to the red electron beam and blue electron beam, resulting in the occurrence of misconvergence. can be prevented. Furthermore, by changing the thickness, area, amount of magnetization, spacing, etc. of the magnets 51, 52, 53, 54, the balance between correcting raster distortion and preventing misconvergence can be easily changed. Therefore, the optimum point can be easily found.

Note that in FIG. 1(B), the magnets 51, 52 .
On the back side (depth direction) of 53 and 54, a magnetic field having the opposite direction and the same shape as the magnetic field Ha is formed, but since the magnetic core 30 exists behind it and is bypassed, its influence is reduced. .

Furthermore, specifically, for example, a separator 60 as shown in FIG. 3 may be used. This separator 60 has recesses 61, 62, 63, and 64 formed at positions corresponding to the front bend-up portions of the horizontal deflection coil (not shown), and the magnets 51 and 64 are formed in these recesses. .5
2.53 and 54 can be installed respectively. If such a separator 60 is used, the magnet 51.

Effects such as easy positioning when attaching 52, 53, and 54, and difficulty in peeling off of the magnet can be obtained.

Note that the present invention is not limited to the above-described embodiment, and the number of magnets is a multiple of 4, that is, 4.8.12.16.・・・
・It's fine if it is.

H1 Effects of the Invention As is clear from the description of the embodiments described above, according to the deflection device of the present invention, a magnet is placed near the front bend-up portion of the horizontal deflection coil so that the magnetization direction is in the tube axis direction. By arranging the tube, a magnetic field in the direction of the tube axis and a magnetic field in the direction perpendicular to the tube axis are formed, and raster distortion can be corrected without causing misconvergence.

[Brief explanation of drawings]

Fig. 1 (5) is a partially cutaway side view schematically showing a deflection device according to an embodiment of the present invention, Fig. 1 (03) is a front view, and Fig. 2 shows the shape and magnetization direction of the magnet. The enlarged perspective view and FIG. 3 are front views showing a specific example of the separator. Figure 4 is a diagram for explaining raster distortion, Figure 5 is a front view showing a conventional example of a deflection device, Figure 6 is a diagram for explaining misconvergence, and Figure 7 is a distorted magnetic field for a vertical deflection coil. FIG.

Claims (2)

[Claims] (1) In a deflection device for an in-line color cathode ray tube having a horizontal deflection coil, a vertical deflection coil, and a separator that separates the horizontal deflection coil and the vertical deflection coil, the vicinity of the front bend-up portion of the horizontal deflection coil. A deflection device characterized in that at least four magnets are arranged at positions such that the magnetization direction is in the tube axis direction. (2) The separator has a recess formed at a position corresponding to the front bend-up portion of the horizontal deflection coil, and the magnet is attached to the recess. deflection device.