JP2005166264A - Deflection yoke and cathode ray tube display device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a deflection yoke having small power consumption by reducing the deflection sensitivity of a screen distortion correction. <P>SOLUTION: The deflection yoke includes horizontal deflection coils 2a, 2b, vertical deflection yokes 3a, 3b, a main screen distortion correcting coil 4a, and a magnetic core 5a. The coil used as the vertical deflection coil is made of a pair of coil halves, each of which is divided into a first coil 7a and a second coil 7b. The first coils 7a and the second coils 7b are respectively connected to each other. The first coils 7a are used as the coils 3a, 3b for the vertical deflection, and the second coils 7b are formed as the coils 3c, 3d for correcting a sub-screen distortion, and connected to the main screen distortion correcting coil 4a. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a deflection yoke and a cathode ray tube display device using the same, and more particularly to a screen distortion correction coil thereof.

  FIG. 6 is an external view of a conventional cathode ray tube deflection yoke, and FIG. 7 is a connection diagram of the cathode ray tube deflection yoke. In FIG. 7, 2 is a horizontal deflection circuit in which horizontal deflection coils 2a and 2b are connected in parallel, 3 is a vertical deflection circuit in which vertical deflection coils 3a and 3b are connected in parallel, and 4 is a screen distortion in which a main screen distortion correction coil 4a is connected. It is a correction circuit. Further, as shown in FIG. 6, the main screen distortion correction coil 4a is wound around the main screen distortion correction core 4b on the small diameter side of the deflection yoke. In the figure, reference numeral 5a denotes a magnetic core.

Since the conventional deflection yoke has a limited space for mounting the main screen distortion correcting core 4b, the main screen distortion correcting core 4b cannot be lengthened, and the deflection sensitivity (LI ² ) of the screen distortion correcting coil. There was a limit to reducing this.

  A color projection television is provided with three cathode ray tubes (brown tubes) corresponding to the three primary colors of light (red, green, and blue), and images from these cathode ray tubes are reflected or transmitted using an optical system. It is a cathode ray tube display device of a type that is projected onto a screen and synthesized and displayed.

  In this system, as shown in FIG. 8, a cathode ray tube 9a corresponding to red, a cathode ray tube 9b corresponding to green, and a cathode ray tube 9c corresponding to blue are arranged on one screen 8, respectively. . In the example of the figure, the cathode ray tube 9b is arranged in front of the screen 8, the cathode ray tube 9a is arranged so as to project from the left side with respect to the screen 8, and the cathode ray tube 9c is projected from the right side with respect to the screen 8. Is arranged.

Among the screens 8 shown separately on the upper side in the figure, the screen 8 shown on the left side shows a grid-like image when only red is projected by the cathode ray tube 9a. The state of the screen 8 is a lattice-like image when only the green is projected by the cathode ray tube 9b, and the state of the screen 8 shown on the right side is a lattice-like image when only the blue is projected by the cathode-ray tube 9c. They are shown separately. The screen 8 described below shows an image when the three colors are combined. As shown in this figure, the cathode ray tube 9b corresponding to the green color arranged in front of the screen 8 has no problem. However, the red and blue lights arranged on the left and right sides of the screen have different distances at the right and left edges, so the red horizontal trapezoidal distortion is constricted on the left side, and blue is constricted on the right side. It becomes a shape. The correction of the horizontal trapezoidal distortion is performed using the main screen distortion correction coil 4a. However, the correction amount is large and there is a problem of power consumption.

  An object of the present invention is to provide a deflection yoke and a cathode ray tube display device using the same, which eliminate such drawbacks of the prior art, reduce the deflection sensitivity of screen distortion correction and consume less power.

  In order to achieve the above object, a first means of the present invention is used as the vertical deflection coil in a deflection yoke including a horizontal deflection coil, a vertical deflection coil, a main screen distortion correction coil, and a magnetic core. The coil portion is composed of a pair of coil halves, and each coil half is divided into a first coil portion and a second coil portion, and the first coil portion and the second coil portion are connected to each other. In addition, the first coil portion is used as a vertical deflection coil, and the second coil portion is connected to the main screen distortion correction coil as a sub-screen distortion correction coil. .

  To achieve the above object, the second means of the present invention is a coil used as the vertical deflection coil in a deflection yoke comprising a horizontal deflection coil, a vertical deflection coil, a main screen distortion correction coil, and a magnetic core. The portion is composed of a pair of coil halves, each of which is divided into a first coil portion, a second coil portion, and a third coil portion. The two coil portions are connected to each other, the first and third coil portions are used as vertical deflection coils, and the second coil portion is used as a sub-screen distortion correction coil. It is characterized by being connected to.

  According to a third means of the present invention, in the first means, an intermediate tap for dividing the first coil portion and the second coil portion is provided.

  According to a fourth means of the present invention, in the second means, an intermediate tap for dividing the first coil portion, the second coil portion, and the third coil portion is provided. is there.

  According to a fifth means of the present invention, in the first or second means, the horizontal deflection coil and the vertical deflection coil are wound in a bowl shape.

  According to a sixth means of the present invention, in the first or second means, the second coil portion has a winding angle ranging from 0 ° to 30 ° from the vertical axis to the center of gravity of the second coil portion. It is characterized by being regulated by

  According to a seventh means of the present invention, in the cathode ray tube display device in which the deflection yoke is mounted on the cathode ray tube, the deflection yoke is the deflection yoke of the first to sixth means.

  According to an eighth means of the present invention, in the seventh means, the cathode ray tube display device projects and displays three cathode ray tubes corresponding to the three primary colors of light and images from the cathode ray tube. And a screen.

  The present invention is configured as described above, and the deflection area of the main screen distortion correction coil can be widened by the sub-screen distortion correction coil, so that the deflection sensitivity of the screen distortion correction can be greatly reduced. It is possible to provide a small number of deflection yokes and a cathode ray tube display device using the same.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is an external view of a deflection yoke according to the first embodiment of the present invention, FIG. 2 is a connection diagram of the deflection yoke, and FIG. 3A is an external view of a vertical deflection coil and a sub-screen distortion correction coil of the deflection yoke. (B) is a cross-sectional view of the vertical deflection coil and the sub-screen distortion correction coil, (c) is a diagram showing the connection relationship between the direct deflection coil and the sub-screen distortion correction coil, and (d) is the vertical deflection. FIG. 1 is a connection diagram of a circuit and a screen distortion correction circuit. As shown in FIG. 1, the deflection yoke according to the embodiment of the present invention includes a main screen distortion correction coil 4a and a main screen distortion correction core 4b on the small diameter side of the deflection yoke. A wound one is arranged, and 5a is a magnetic core. As shown in FIG. 2, the horizontal deflection circuit 2 has a horizontal deflection coil 2a and a horizontal deflection coil 2b wound in parallel in a bowl shape, and the vertical deflection circuit 3 is a vertical deflection coil wound in a bowl shape. 3a and the vertical deflection coil 3b are connected in parallel, and the screen distortion correction circuit 4 connects the main screen distortion correction coil 4a, the sub-screen distortion correction coil 3c, and the sub-screen distortion correction coil 3d in series.

  In the embodiment of the present invention, the vertical deflection coils 3a and 3b and the sub-screen distortion correction coils 3c and 3d are wound at the same time. This is because the intermediate tap 6a is pulled out immediately after winding the normal vertical deflection coils 3a and 3b, and the secondary screen distortion correction coils 3c and 3d are continuously wound, so that the vertical deflection coils 3a and 3b and the secondary screen are wound. A pair of distortion correction coils 3c and 3d is provided.

  Specifically, as shown in FIG. 3 (b), the coil portion used as the vertical deflection coil is composed of a pair of coil halves 3a and 3a, 3b and 3b, 3c and 3c, 3d and 3d, As shown in FIG. 3D, the coil half is divided into a first coil portion 7a and a second coil portion 7b, and the first coil portions 7a and the second coil portions 7b are connected in series or In addition to being connected in parallel (in this embodiment, connected in series), the first coil portion 7a is used as the vertical deflection coils 3a and 3b, and the second coil portion 7b is used as the sub-screen distortion correction coil 3c. , 3d, and the sub-screen distortion correction coils 3c, 3d are connected in series or in parallel in the main screen distortion correction coil 4a (in this embodiment, connected in series).

  And in order to divide into the above-mentioned 1st coil part 7a and 2nd coil part 7b, as shown in Drawing 3 (a)-(c), intermediate tap 6a is provided, and from winding start to intermediate tap 6a The first coil portion 7a is used for the vertical deflection coils 3a and 3b, and the second coil portion 7b from the intermediate tap 6a to the end of winding is used for the sub-screen distortion correction coils 3c and 3d.

  The optimum inductance of the sub-screen distortion correction coils 3c and 3d varies depending on the inductance of the main-screen distortion correction coil 4a.

  As means for reducing the deflection sensitivity of the screen distortion correction coil, by increasing the length of the main screen distortion correction core 4b, the magnetic flux generated from the screen distortion correction coil can be increased to reduce the deflection sensitivity. There is a limit to the installation space for the correction core 4b. Therefore, in the present invention, the deflection area of the main screen distortion correction coil 4a can be widened by the sub-screen distortion correction coils 3c and 3d, and the deflection sensitivity of the screen distortion correction can be greatly reduced.

There are two major factors that affect the deflection sensitivity of the screen distortion correction coil in addition to the deflection region. The first is the number of turns of the coil, which does not change even if it is wound more than a certain amount (even if the inductance is increased), and the deflection sensitivity is LI ² , but in the case of a certain number of turns or less, the screen The deflection sensitivity for distortion correction can be deteriorated.

  The second is the position of the screen distortion correction coil, and the deflection sensitivity of the screen distortion correction can be reduced by arranging it on the electron gun side up to a certain position.

  In the present invention, since the number of turns of the sub-screen distortion correction coils 3c and 3d controls the above two factors, the number of turns of the sub-screen distortion correction coils 3c and 3d is wound until the deflection sensitivity becomes the best. When tangent to the main screen distortion correction core 4b, the influence of the magnetic core being located on the tube surface side is stronger than the widening of the deflection region, and the deflection center of gravity is shifted to the tube surface side, conversely degrading the deflection sensitivity. End up.

  The second coil portion 7b regulates the winding angle from the vertical axis to the center of gravity of the second coil portion 7b within a range of 0 ° to 30 °. If the winding angle exceeds 30 °, there is a problem that the effect of improving the screen distortion correction deflection sensitivity is small. Therefore, it is necessary to regulate the winding angle in a range of 0 ° to 30 °.

  FIG. 5 is a characteristic diagram showing a change in distortion correction sensitivity when the number of turns (inductance) of the sub-screen distortion correction coils 3c and 3d is changed while the number of turns of the main-screen distortion correction coil 4a is constant. As shown in the figure, it can be seen that when the number of turns (inductance) of the sub-screen distortion correction coils 3c and 3d is increased, the distortion correction sensitivity deteriorates from a certain point.

  When the present embodiment is applied, the sub-screen distortion correction coils 3c and 3d are set to a certain number of turns or less, and the main-screen distortion correction coil 4a is not dared to improve the deflection sensitivity of the sub-screen distortion correction coils 3c and 3d. By setting the inductance ratio of the main screen distortion correction coil 4a and the sub screen distortion correction coils 3c and 3d so that the distortion correction sensitivity is optimal in a state where the sub screen distortion correction coils 3c and 3d are connected, It is possible to greatly reduce the image distortion deflection sensitivity.

  As shown in FIG. 3, when the sub-screen distortion correction coils 3c and 3d are formed on the winding end side (winding angle 0 °), the sub-screen distortion correction coils 3c and 3d can reduce the deflection sensitivity of the screen distortion correction coil. However, since the winding end side cannot be used by the vertical deflection coils 3a and 3b, the vertical deflection sensitivity is slightly increased. This is the first embodiment of the present invention. Conversely, by making the sub-screen distortion correction coils 3c and 3d on the winding start side (winding angle of about 70 °), the deterioration can be minimized, but the deflection sensitivity of the screen distortion correction coil deteriorates. .

  The second embodiment of the present invention shown in FIG. 4 solves each problem. As shown in FIG. 4B, the coil portion used as the vertical deflection coil includes a pair of coil halves 3a and 3a, 3b and 3b, 3c and 3c, 3d and 3d, 3e and 3e, 3f and 3f. Each coil half is divided into a first coil portion 7a on the winding start side, a second coil portion 7b in the middle, and a third coil portion 7c on the winding end side. The coil portions 7a and 7c and the second coil portion 7b are connected to each other. The first and third coil portions 7a and 7c are used as the vertical deflection coils 3a, 3b, 3e and 3f, and the second coil portion 7c is used as the sub-screen distortion correction coils 3c and 3d. The screen distortion correction coil 4a is connected in series or in parallel (in this embodiment, connected in series).

  The coil is divided into three by the intermediate tap 6a and the second intermediate tap 6b. The coils from the winding start to the intermediate tap 6a (first coil portion 7a) are the vertical deflection coils 3a and 3b, and the coil from the intermediate tap 6a to the second intermediate tap 6b (second coil portion 7b) is the sub-screen. The distortion correction coils 3c and 3d are used, and the coil (third coil portion 7c) from the second intermediate tap 6b to the end of winding is used as the second vertical deflection coils 3e and 3f.

  Then, as shown in FIG. 4D, the vertical deflection coils 3a and 3b and the second vertical deflection coils 3e and 3f are connected in series, and these are used as the vertical deflection coils. The sub-screen distortion correction coils 3c and 3d are connected in series and used as a screen distortion correction coil.

  The deflection yoke of the present invention is mounted on a cathode ray tube to constitute a cathode ray tube display device. This cathode ray tube display device is particularly suitable for a color projection television including three cathode ray tubes corresponding to the three primary colors of light and one screen for projecting and displaying an image from the cathode ray tube.

1 is an external view of a deflection yoke according to a first embodiment of the present invention. FIG. 3 is a connection diagram of a horizontal deflection circuit, a vertical deflection circuit, and a screen distortion correction circuit of the deflection yoke according to the first embodiment. External view (a) of vertical deflection coil and sub-screen distortion correction coil of deflection yoke according to the first embodiment, cross-sectional view (b) of vertical deflection coil and sub-screen distortion correction coil, vertical deflection coil and sub-drawing distortion correction FIG. 6C is a connection diagram of a vertical deflection circuit and a screen distortion correction circuit, showing a connection relationship of coils. FIG. 5A is an external view of a vertical deflection coil and a sub-screen distortion correction coil of a deflection yoke according to a second embodiment of the present invention, a cross-sectional view of the vertical deflection coil and the sub-screen distortion correction coil, and a vertical deflection coil and a sub-screen. FIG. 4C is a diagram showing a connection relationship between the distortion correction coil and the second vertical deflection coil, and FIG. 4D is a connection diagram between the vertical deflection circuit and the screen distortion correction circuit. In the deflection yoke according to the first embodiment of the present invention, it is a characteristic diagram showing a change in deflection sensitivity of the sub-screen distortion correction coil when the number of turns (inductance) of the sub-screen distortion correction coil is changed. It is an external view of the conventional deflection yoke. FIG. 5 is a connection diagram of a horizontal deflection circuit, a vertical deflection circuit, and a screen distortion correction circuit of the deflection yoke. It is a figure for demonstrating the subject of the prior art in a color projection type television.

Explanation of symbols

  2: horizontal deflection circuit, 2a, 2b: horizontal deflection coil, 3: vertical deflection circuit, 3a, 3b: vertical deflection coil, 3c, 3d: sub-image distortion correction coil, 3e, 3f: second vertical deflection coil, 4: Screen distortion correction circuit, 4a: main / sub image distortion correction coil, 4b: main / sub image distortion correction core, 5a: core, 6a: intermediate tap, 6b: second intermediate tap, 7a: first coil portion, 7b: 2nd coil part, 7c: 3rd coil part.

Claims (8)

In a deflection yoke comprising a horizontal deflection coil, a vertical deflection coil, a main screen distortion correction coil, and a magnetic core,
The coil portion used as the vertical deflection coil is composed of a pair of coil halves, each of which is divided into a first coil portion and a second coil portion, and the first coil portions and the first coil portions The two coil portions are connected to each other, the first coil portion is used as a vertical deflection coil, and the second coil portion is connected to the main screen distortion correction coil as a sub-screen distortion correction coil. A deflection yoke characterized by that. In a deflection yoke comprising a horizontal deflection coil, a vertical deflection coil, a main screen distortion correction coil, and a magnetic core,
A coil portion used as the vertical deflection coil is composed of a pair of coil halves, each of which is divided into a first coil portion, a second coil portion, and a third coil portion. , The third coil portion and the second coil portion are connected to each other, and the first and third coil portions are used as vertical deflection coils, and the second coil portion is corrected for sub-screen distortion. A deflection yoke, characterized in that the deflection yoke is connected to the main screen distortion correction coil as a coil for use.   2. The deflection yoke according to claim 1, further comprising an intermediate tap for dividing the first coil portion and the second coil portion.   3. The deflection yoke according to claim 2, further comprising an intermediate tap for dividing the first coil portion, the second coil portion, and the third coil portion.   3. The deflection yoke according to claim 1, wherein the horizontal deflection coil and the vertical deflection coil are wound in a bowl shape.   3. The deflection yoke according to claim 1, wherein the winding angle of the second coil portion from the vertical axis to the center of gravity of the second coil portion is restricted to a range of 0 ° to 30 °. Characterized deflection yoke.   7. A cathode ray tube display device in which a deflection yoke is mounted on a cathode ray tube, wherein the deflection yoke is the deflection yoke according to any one of claims 1 to 6. 8. The cathode ray tube display device according to claim 7, wherein the cathode ray tube display device includes three cathode ray tubes corresponding to the three primary colors of light and one screen for projecting and displaying an image from the cathode ray tube. A cathode ray tube display device characterized by comprising:

Images