JPS5846519Y2 - Deflection distortion correction device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mounting device for a deflection distortion correction magnet in a deflection yoke for a television receiver.

As is well known, in devices such as television receivers and cathode ray tube display devices that electromagnetically deflect cathode ray tube electron beams using a deflection yoke to display an image on a fluorescent surface, in order to display an image with the correct shape, requires precise control of the magnetic field distribution of the deflection yoke.

However, since the deflection yoke is constructed by winding copper wire many times and using a ferrite magnetic core, it is difficult to precisely control the magnetic field during mass production, and variations in the constants of these parts can affect the displayed image. This often causes shape distortion (hereinafter collectively referred to as deflection distortion).

In particular, when the displayed image is a computer-output character or figure or a geometric drawing such as a video game, the deflection distortion becomes noticeable, and this correction has become indispensable.

Therefore, conventionally, as shown in FIG. 1, a pole piece 13 is provided on the outer periphery of a cover 12 of a deflection yoke 11, and a cylindrical magnet 14 is rotatably attached therein.

However, the parts mounting mechanism is relatively expensive, a special tool with a mouth-shaped tip is required for adjustment, and the rotation adjustment is generally fine adjustment because the rotation of this type of cylindrical magnet is hard. There have been various problems such as difficulty in adjusting the deflection distortion, and difficulty in making optimal adjustment for asymmetric deflection distortion.

This proposal was made in view of these points, and in addition to using a rod-shaped relatively inexpensive correction magnet, the position of the magnet relative to the deflection yoke is adjusted in order to more precisely control the magnetic field distribution of the deflection yoke. This provides a mounting device for a deflection distortion correction magnet in three directions.

The present invention will be explained below with reference to drawings of embodiments.

As shown in FIG. 2, the device 4 of the present invention is attached to the cone portion 21 of the cathode ray tube 2 by being held by the tip of the deflection yoke 3.

This mounting position is set at a position where the correction magnetic field acts on the deflected electron beam as shown by the arrow hole in FIG. 2, making it possible to adjust the trajectory of the electron beam.

Here, 31 is a winding of the deflection yoke. FIG. 3 is a perspective view showing an embodiment of the device 4 of the present invention, where 41 is an adjustment plate made of a relatively inexpensive flexible insulating material such as resin or pressboard, and the neck portion of the cathode ray tube 2 is located in the center. A first hole 42 is provided through which the hole 42 is penetrated, and a plurality of tongue pieces 43 held between the tip of the deflection yoke 3 and the cone portion of the cathode ray tube 2 are provided along the inner circumference of the hole 42. It is provided.

Further, the adjustment plate 41 is provided with oval second holes 44 radially centering on the first hole 42 .

Two second holes 44 are provided in FIG. 3, and four in the perspective view of another embodiment in FIG. 6.

As shown in a partially enlarged view in FIG. 4, the pivot portions 51 and 52 of the holder 5 of the first embodiment of the present invention are fitted into the second hole 44.

At the top of the pivot portions 51 and 52, there is a fitting portion 53 that holds the rod-shaped permanent magnet 6 so as to be slidable along its elongated direction.
．． 54 are integrally formed.

The pivot portions 51,52 are shown in cross-section in FIG.
When inserted into the hole 44 of the pair of washers 55 and 56
Then, the adjustment plate 41 is inserted and its tip is bent outward.

Therefore, the washer 55,56 has this pivot portion 51.
Square holes 551 and 561 are provided, as shown in FIG. 4, so that the tube 52 is inserted therethrough and rotates together with the hole.

In this way, the pivot parts 51 and 52 of the main holder 5 and the insertion part 5
3.54 can be easily assembled as shown in Figures 3, 5, and 6.

Here, in this embodiment, the pivot portion 51.52 is connected to the second hole 4.
When assembled together with 4, it also serves as the sliding part of the main holder 5.

That is, the pivot portions 51 and 52 are large enough to be sufficiently rotatable relative to the size of the second hole 44, and are also large enough to be slidable along this oval second hole. Designed.

As a result, the present holder 5 can freely move in three directions as shown by arrows A to C in FIG.

This means that the permanent magnet 6 moves in exactly the same three directions, and the cathode ray tube 2 penetrated through the first hole 42
This makes it possible to finely control the magnetic field distribution with respect to the tube axis.

Therefore, as shown in FIGS. 3 and 6, if the present holder 5 is appropriately placed at several locations around the tube axis (not shown) of the cathode ray tube 2, the magnetic field distribution can be adjusted more finely. is possible.

Of course, the assembly of the holder 5 at each location can be realized in the same manner as described above.

As described above, the deflection distortion correction device of the present invention is constituted by the adjustment plate 41 and the holder 5, and the permanent magnet 6 held by the holder 5 moves freely in three directions, so that it can move with respect to the tube axis of the cathode ray tube. The correction magnetic field distribution can be finely adjusted and controlled.

In addition, after the optimum adjustment, in the present embodiment, the position of the permanent magnet may be fixed with an appropriate adhesive or the like.

Further, as shown in FIG. 4, the holder 5 of the present invention is attached to the adjustment plate 41 using a pair of washers 55 and 56, which is the easiest to assemble example, but the present invention is not limited to this. Needless to say, as long as the holder 5 is slidable and rotatable with respect to 44 and the rod-shaped permanent magnet can be moved in the longitudinal direction, it can be modified as appropriate.

[Brief explanation of the drawing]

Fig. 1 is a front view of a conventional device of this type viewed from the electron gun side, Fig. 2 is a cross-sectional view showing the installed state of the embodiment of the present invention, and Fig. 3 is a perspective view showing an embodiment of the device of the present invention. 4 is an exploded perspective view of the main part of the present invention, FIG. 5 is a sectional view of the main part of the present invention, and FIG. 6 is a perspective view showing another embodiment of the present invention. 42...First hole, 44...Second hole, 43...Notch tongue piece, 51, 52...
・Sliding part, 51.52... Pivotal part, 6...
...Magnet, 53.54...Fitting part, 5...
... Rod-shaped magnetic material holder, 41 ... Adjustment plate.

Claims (1)

[Scope of utility model registration request] A through hole is provided in the center for the neck of the cathode ray tube to pass through.
Elongated holes are arranged radially at several locations on the outer periphery of this hole, and a plurality of notch-shaped tongues, which are held between the cone of the cathode ray tube and the front surface of the deflection yoke, are placed along the inner periphery of the through hole. The distance between the adjustment plate and the center of the through hole can be changed as appropriate by moving it along the longitudinal edge of the elongated hole, and the rotation angle can be adjusted arbitrarily at an appropriate position along the edge of the elongated hole. A rod-shaped magnet is slid along the longitudinal direction of the shaft center of the mounting portion, and a fitting portion is provided integrally with the mounting portion to be held at an appropriate position. What is claimed is: 1. A deflection distortion correction device comprising: a rod-shaped magnetic material holder; the holder is disposed in each of the elongated holes of the adjustment plate.