JPS583249Y2 - deflection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a deflection device, and more particularly to a deflection device configured to compensate for dynamic convergence.

A color picture tube deflection device that uses multiple electron beams electromagnetically scans the electron beams emitted from multiple electron guns built into the color picture tube onto a fluorescent screen to form a raster. It is a device.

Generally used deflection devices include a pair of horizontal deflection coils 1 and 2 that scan the electron beam in the horizontal direction, and a pair of vertical deflection coils 3 and 4 that scan the electron beam in a direction substantially perpendicular to this. , a bobbin 5 for assembling these, and a holding portion 8 extending from the bobbin 5.
and a tightening metal fitting 6 for tightening this holding portion 8 via a tightening screw 7.

It is considered advantageous in terms of characteristics that the horizontal deflection coil pair 1 and 2 are wound in a saddle shape, and the vertical deflection coil pair 3 and 4 are wound in a toroidal shape, and this combination is usually used.

Further, the color picture tube is equipped with a plurality of electron guns arranged in a straight line in the horizontal direction, and in order to concentrate the electron beams emitted from these electron guns on the fluorescent screen, horizontal deflection is required as shown in FIG. It is necessary that the magnetic field lines 21 of the magnetic field have a bottle cushion-shaped magnetic field distribution, and the magnetic field lines 31 of the vertical magnetic field have a barrel-shaped magnetic field distribution as shown in FIG.

However, as mentioned above, since the deflection magnetic field is a non-uniform magnetic field, errors in the magnetic field distribution of the deflection yoke having such characteristics,
Alternatively, a deviation in convergence (hereinafter referred to as misconvergence) occurs due to mismatch between the tube axis of the color picture tube and the axis of the deflection device.

One of the main patterns of this misconvergence is the fourth
As shown in the figure, a raster 41 is formed by an electron beam emitted from an electron gun located on the tube axis, whereas a raster 42 is formed by an electron beam emitted from one electron gun that is not on the tube axis.
forms a relatively larger raster than the raster 41,
A raster 43 formed by the electron beam emitted from the other electron gun forms a raster relatively smaller than the raster 41.

Another pattern of misconvergence is that, as shown in FIG. The raster 52 formed by the electron beam emitted from the other electron gun is shifted clockwise relative to the raster 51, and the raster 53 formed by the electron beam emitted from the other electron gun is shifted relative to the raster 51. Causes counterclockwise deviation.

When a deflection device with a nonuniform magnetic field is used in this manner, there is a drawback that misconvergence is likely to occur even due to a slight deviation between the tube axis and the axis.

The present invention was devised in view of the above-mentioned drawbacks, and it is an object of the present invention to provide a deflection device that can correct slight positional deviations between the tube axes and the axes using a simple and inexpensive method.

Next, one embodiment of the deflection device of the present invention will be described with reference to FIGS. 6 to 8.

That is, a bobbin 61 that supports a horizontal deflection coil and a vertical deflection coil (not shown) has a main body part 62 determined by the shapes of the two deflection coils, and a plurality of strip parts 62 in the axial direction that loosely fit into the neck of the color picture tube. a divided holding portion 63; a claw portion 67 for rotatably attaching the annular plate 64 to the open ends of at least two pieces of the strip portion 66;
It consists of a slide plate 65 that is slidably attached to the annular plate 64 in a direction substantially perpendicular to the axis, and a tightening fitting 69 that tightens the holding part 63 via a tightening screw 68.

Next, the annular plate 64 will be further explained with reference to FIG.

That is, the annular plate 64 has a protrusion 72° 73 of at least 1″N.
The slide plate 6 has a magnetic body 71 fixed thereto and has a magnetic body 71 shaped as shown in FIG.
5 is slidably attached.

The size and shape of the magnetic body 71 are determined depending on the sensitivity of convergence correction, etc., and are fixed to the slide plate 65 with an adhesive or the like.

In the deflection device having such a structure, the main body 62 is attached to the outer wall of the funnel of the color picture tube by an appropriate method, the annular plate is rotated, and the slide plate is further slid to match the rasters on the fluorescent screen. However, according to experiments by the inventors, when correcting the misconvergence shown in FIGS. 4 and 5, for example, the magnetic body 71 has a width of about 15 mm,
Good results were obtained by using a material having a length of about 40 mm and having one side in the length direction formed into an arc shape that approximately corresponds to the inner diameter of the annular plate 64.

The adjustment method was briefly described above, but for example, if the magnetic body 71 is placed at the top, the electron beam emitted from the electron gun located on the right side of the tube axis when facing from the fluorescent screen side will rotate clockwise. However, the electron beam emitted from the electron gun located on the left side of the tube axis rotates counterclockwise.

Furthermore, when the magnetic body 71 is placed at the bottom, the electron beams described above rotate in the opposite directions.

Further, by placing the magnetic bodies 71 on the left and right sides of the neck of the color picture tube, the misconvergence of the pattern shown in FIG. 4 is corrected.

That is, if the magnetic material 71 is placed on the left side when facing from the fluorescent screen of the color picture tube, the raster generated by the electron beam emitted from the electron gun located on the left side of the tube axis will form a relatively small raster. , the raster generated by the electron beam emitted from the electron gun located on the right side works to form a relatively large raster.

If the magnetic body 71 is placed on the right side of the neck of the color picture tube, the situation will be reversed.

Furthermore, if the magnetic body 71 is arranged in the direction of the diagonal axis, a mixed effect of the above-mentioned upper, lower, and left and right effects can be obtained.

Therefore, by having the structure of this embodiment, dynamic convergence can be easily adjusted, and its industrial value is extremely large.

In the above embodiment, there was one slide plate slidably attached to the annular plate and one magnetic body fixed to this slide plate, but the number is not limited to one. Multiple annular plates may be provided at the same time, such as on the left or right, and on the bottom or the bottom, or by providing a slide plate on each of the annular plates and providing a magnetic piece on each slide plate, more complicated misconvergence can be corrected. It goes without saying that the same effect can be obtained by using a magnet in place of the magnetic material and fixing it at an appropriate position on the slide plate in an appropriate polar direction.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an example of a conventional deflection device, Fig. 2 is a plan view showing a horizontal deflection magnetic field, Fig. 3 is a plan view showing a vertical deflection magnetic field, and Figs. 4 and 5 are different rasters. FIG. 6 is an exploded perspective view of an embodiment of the deflection device of the present invention, FIG. 7 is a perspective view showing the main part of the annular plate in FIG. 6, and FIG. 8 is a magnetic body. It is a top view showing an example. 64... Annular plate, 65... Slide plate, 71... Magnetic material.

Claims (1)

[Scope of utility model registration request] a deflection yoke attached to the outer wall of the funnel portion of the color picture tube and having an axis substantially coaxial with the tube axis of the color picture tube; an annular plate rotatably attached to the neck side of the deflection yoke; and the annular plate. A deflection device comprising: at least one slide plate slidably attached in a direction substantially perpendicular to the axis; and a magnetic body or magnet fixed to the slide plate.