JPH0720834Y2 - Deflection yoke device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a deflection yoke device having a rotation coil for correcting the inclination of a raster due to geomagnetism.

[Prior Art] A television receiver or a display device has a built-in deflection yoke, and raster-scanning of a screen is performed by driving the deflection yoke.

In recent years, there has been a demand for higher definition screens of television receivers and display devices (hereinafter referred to as TV screens). In order to meet this demand, a means for correcting TV screen misconvergence is provided to improve the screen resolution. Development of image quality is being actively conducted.

In order to meet the demand for high definition of the television screen, it is important to pursue high image quality of the television screen as described above, but it is also necessary to correct the inclination due to the geomagnetism of the raster of the television screen. What is desired.

However, in response to the demand for higher definition of the television screen, attention is focused on improving the image quality of the television screen, and as a means for correcting the inclination of the raster due to the geomagnetism, a concrete solution has not been disclosed yet. Absent.

[Problems to be solved by the device]

As shown in FIG. 5 (a), when there is no influence of geomagnetism, the raster pattern 2 on the television screen 1 becomes a normal screen without inclination. On the other hand, as shown in FIG. 6 (a), when the TV screen 1 is directed to the north side, the geomagnetism escapes from the back side of the paper to the front side (from the neck side of the deflection yoke to the head side), which affects the raster. However, the raster 3 on the TV screen 1 tilts to the right due to the force of this geomagnetism,
As shown in FIG. 2B, the raster pattern 2 on the television screen 1 has a tilt pattern that rises to the right. On the contrary, when the television screen 1 is turned to the south, as shown in FIG. 6 (b), the geomagnetism is directed from the front side to the back side of the paper, and the raster 3 is inclined downward to the right. As a result, the raster pattern 2 on the television screen 1 becomes a downward slope pattern as shown in FIG. 5 (c).

In order to correct the inclination of the raster 3 due to the geomagnetism, the deflection yoke may be attached by rotating it by the correction angle of the raster 3, but each time the user turns the television screen 1 to the south or the north, the deflection yoke is changed. It is very difficult to adjust the rotation. In order to reduce such a burden on the user, it may be considered that the manufacturer adjusts the television pattern 1 so that the raster pattern 2 becomes a normal screen when the television screen 1 is faced to the south and then ships the television pattern 1. However, when the user specifies the TV screen 1 facing south, that is all right, but when the TV screen 1 is used facing north, there is a problem that the raster pattern 2 tilts due to geomagnetism.

The present invention has been made to solve the above problems, and its purpose is to very easily correct the tilt of the raster due to the geomagnetism regardless of whether the user points the television screen in the south direction or the north direction. It is an object of the present invention to provide a deflection yoke device that can obtain a normal screen free from defects.

[Means for Solving the Problems]

The present invention is configured as follows to achieve the above object. That is, in the deflection yoke device of the present invention, a plurality of rotation coils with different numbers of turns for correcting the inclination of the raster due to geomagnetism are mounted in a portion other than the area where the core of the deflection yoke is arranged, and one of these rotation coils is commonly used. The terminal side is connected to one side pole of the DC power supply via an inverting switch that switches between positive and negative current, and each terminal side on the other side of each rotation coil is connected to the other side pole of the DC power supply via a connection changeover switch. It is configured by being characterized.

[Action]

In the present invention configured as described above, a direct current is applied to the rotation coil mounted on the deflection yoke, and the connection changeover switch is operated to select the rotation coil with an appropriate number of turns to reverse the direction of the earth's magnetism. ,
By generating the correction magnetic field having the same magnitude as the geomagnetism, the geomagnetism is canceled by the correction magnetic field and disappears.
As a result, the raster beam does not receive a rotational force from the earth's magnetism, so that a normal raster pattern having no tilt on the television screen can be obtained.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the deflection yoke device according to the present invention.

A characteristic of this embodiment is that a coil winding is wound in an annular shape for about 500 turns and a winding other than that is used to form a plurality of ring-shaped rotation coils 4 having different numbers of windings. This is fitted to the outer peripheral surface of the deflection yoke 5 on the head side (TV screen side) and fixed to the deflection yoke 5 with an adhesive or the like.

As shown in FIG. 2, one end side of each rotation coil 4 is commonly made conductive and connected to the output end of the inverting switch 6, and the input end of the inverting switch is connected to the DC power supply 7
One pole, in this figure, is connected to the positive pole. The other pole (negative pole in this figure) of the DC power supply 7 is connected to the other terminal side of each rotation coil 4 via a connection changeover switch 9. The reversing switch 6 switches positive / negative of the DC current supplied from the DC power supply 7 to the rotation coil 4. Further, the connection changeover switch 9 switches connection between the DC power supply 7 and each rotation coil 4. The deflection yoke 5 to which the rotation coil 4 is attached is attached to a color or monochrome cathode ray tube 10 as shown in FIG.

In FIG. 1, 12 is a bobbin of the deflection yoke, 13 is a core,
14 is a vertical deflection yoke wound toroidally around the core 13,
Reference numeral 15 is a paddle-shaped horizontal deflection coil, and 16 is a tightening band attachment portion for attaching the deflection yoke 5 to the cathode ray tube 10.

The apparatus of this embodiment is configured as described above, and
The operation will be described.

First, when the television screen is directed to the north, the raster 3 rises to the right due to geomagnetism as shown in FIG. 6 (a), and the raster pattern rises to the right as shown in FIG. 5 (b). The raster pattern rising to the right is corrected by the apparatus of this embodiment as follows. That is, the deflection yoke device with a rotation coil is
In the figure, by directing the television screen to the north, the geomagnetism passes from the back side of FIG. 4 to the front side, that is, from the neck side of the deflection yoke 5 to the head side. At this time, when a positive direct current in the direction of the arrow is passed through the rotation coil 4, the rotation coil 4 causes the front side to the back side of FIG.
That is, the correction magnetic field 11 is generated from the head side of the deflection yoke 5 toward the neck side. That is, the correction magnetic field 11 is generated in the direction opposite to the direction of geomagnetism. Therefore, by operating the connection changeover switch 9 to select the rotation coil 4 having the number of turns in which the magnitude of the correction magnetic field 11 is equal to the magnitudes of other magnetic fields, the correction magnetic field 11 causes the raster 3 on the television screen 1 to move downward to the right. It can exert a rotating force on.
The angle of rotation of the correction magnetic field 11 to the lower right is equal to the angle of rotation to the right of the geomagnetic field. The upward-sloping inclination of 3 is corrected and the normal screen state shown in FIG. In other words, the magnetic field due to the earth's magnetic field is
Raster 3 due to geomagnetism
As a result of the disappearance of the rotational force to the, the normal screen shown in FIG. 5 (a) can be obtained without tilting the raster 3 even if the television screen is directed to the north.

On the other hand, when the TV screen is turned to the south, Fig. 6 (b)
As shown in, the raster 3 receives a downward-sloping rotational force due to the geomagnetism. As a result, the raster pattern on the television screen becomes a downward-sloping tilt pattern as shown in FIG. 5 (c). The inclination of the raster pattern facing south can be corrected by switching the reversing switch 6 and supplying a negative DC current to the rotation coil 4. By the flow of this negative DC current, a correction magnetic field 11 is generated in the rotation coil 4 in the direction opposite to that shown in FIG. 4, that is, a correction magnetic field 11 in the direction opposite to the earth's magnetic field is directed from the neck side to the head side of the deflection yoke. To do. Also in this case, similarly, the connection changeover switch 9 is operated so that the correction magnetic field 11 having the same magnitude as the geomagnetism is obtained, and the rotation coil 4 having the optimum number of turns is selected. The correction magnetic field 11 effectively cancels the geomagnetism, and the downward-sloping raster pattern shown in FIG. 5 (c) is corrected to a normal screen without inclination shown in FIG. 5 (a).

As described above, according to the present embodiment, whether the television screen is facing south or north, the reversing switch 6 controls the positive and negative currents and the connection changeover switch 9 rotates the rotation coil 4. By selecting the number of turns, it is possible to surely correct the inclination of the raster pattern 2.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and various modes of implementation can be adopted. For example, in the above-described embodiment, the rotation coil 4 is mounted on the head side of the deflection yoke 5, but the rotation coil 4 is mounted on a portion other than the core of the deflection yoke (a portion excluding the core region), for example, on the neck side of the deflection yoke 5. It is also possible to provide. However, in this case, the distance between the rotation coil 4 and the raster beam becomes longer than that in the case where the rotation coil 4 is mounted on the head side of the deflection yoke 5, and the correction efficiency is somewhat lowered. In this respect, if the rotation coil 4 is provided on the head side of the deflection yoke 5 as in the present embodiment, the distance between the rotation coil 4 and the raster beam becomes short, so the correction efficiency of the raster 3 is very good, Therefore, the effect that the inclination of the raster 3 can be efficiently corrected with a small current is obtained.

Further, although the rotation coil 4 is mounted on the outer peripheral surface of the deflection yoke 5 on the head side in the above embodiment, it may be mounted on the inner peripheral surface of the head side or on the end surface on the head side. However, the mounting mode is arbitrary.

Further, although the rotation coil 4 is formed in the annular shape in the above-described embodiment, the shape of the rotation coil 4 is not necessarily limited to this, and it may be any ring shape such as square, hexagon, ellipse, or the like. .

Further, the form of the deflection yoke to which the rotation coil is attached is arbitrary, and the horizontal deflection coil forming the deflection yoke may have a square shape or a toroidal winding shape. Further, the vertical deflection yoke may have a paddle shape or a toroidal winding shape.

[Effect of device]

According to the present invention, since the rotation coil is mounted on the portion other than the core disposition area of the deflection yoke, a positive or negative DC current is applied to the rotation coil,
By selecting the rotation coil having the optimum number of turns by the connection changeover switch, it becomes possible to generate the correction magnetic field in the opposite direction to the earth magnetism and having the same magnitude. Therefore, it becomes possible to effectively cancel the geomagnetism by this correction magnetic field, and thereby, the TV screen can be used either in the north or south direction or in any place in the world where the magnitude of the geomagnetism is different. Even in this case, it is possible to obtain a normal raster pattern that is not affected by the inclination of the raster due to the geomagnetism. Further, the operation of canceling the geomagnetic field is performed only by the switch operation of the reversing switch and the connection changeover switch, so that the operation is very easy.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a deflection yoke device according to the present invention, FIG. 2 is a connection circuit diagram of a rotation coil in the same embodiment, and FIG. 3 is an attachment of the device of this embodiment to a cathode ray tube. FIG. 4 is an explanatory view showing an example, FIG. 4 is an operation explanatory view showing an example of correcting a tilt raster pattern in the present embodiment, and FIG.
FIG. 6 is an explanatory view showing a normal screen which is not affected by the geomagnetic field and a tilt screen of each mode which is influenced by the geomagnetic field, and FIG. 6 is an explanatory view which shows the tilt mode of the raster due to the geomagnetic field of the north facing screen and the south facing screen. is there. 1 ... Television screen, 2 ... Raster pattern, 3 ... Raster, 4 ... Rotation coil, 5 ... Deflection yoke, 6 ... Reversing switch, 7 ... DC power supply, 10 ... Cathode ray tube, 11 ... Correction field, 12 …… bobbin, 13 …… core, 14
... Vertical deflection coil, 15 ... Horizontal deflection coil, 16 ... Tightening band.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yuichiro Fujino, 153 Shimo-Kashiwano-cho, Matsuto-shi, Ishikawa, Nanao Co., Ltd. (56) References: 60-24052 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A plurality of rotation coils having different numbers of turns for correcting the inclination of a raster due to geomagnetism are mounted in a portion other than the area where the core of the deflection yoke is disposed, and one side of each of the rotation coils has a common terminal side for supplying a current. A deflection yoke that is connected to one side pole of the DC power supply via an inversion switch that switches between positive and negative, and each terminal side on the other side of each rotation coil is connected to the other side pole of the DC power supply via a connection changeover switch. apparatus.