JPH09306384A - Deflection yoke or color cathode ray tube device or display device including the deflection yoke - Google Patents

Abstract

Kind Code: A1 A deflection yoke capable of suitably distributing a horizontal deflection magnetic field, and a color cathode ray tube device or a display device using the deflection yoke. A horizontal deflection coil used in a deflection yoke is formed of at least one pair of saddle coils, and a cross section of the saddle coils on the phosphor screen side is formed substantially at right angles to the cathode ray tube axis. And a curved portion in which each coil conductor extends from the collar-shaped portion toward the electron gun side while being inclined and curved. As a result, the horizontal deflection coil can be produced by a relatively simple manufacturing facility, and the raster distortion is reduced, the horizontal deflection sensitivity is improved, and the leakage magnetic field from the deflection yoke to the periphery of the display device is reduced. To provide a color cathode ray tube device or a display device using.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke and a display device using the deflection yoke, and more particularly to a deflection yoke capable of providing a horizontal deflection magnetic field with a suitable distribution.

[0002]

2. Description of the Related Art As a first conventional technique of a saddle-shaped deflection coil capable of providing a suitable distribution of a horizontal deflection magnetic field in a deflection yoke, as disclosed in Japanese Patent Laid-Open No. 60-212947, a horizontal deflection coil is disclosed. The deflection coil is formed so that the winding start side of the cross section of the fluorescent screen side is positioned closer to the electron gun side, but the shape of each coil conductor of the cross section of the fluorescent screen is almost perpendicular to the cathode ray tube tube axis. It was formed in an arc shape with a constant radius.

A second type of a deflection coil which can make the horizontal deflection magnetic field in the deflection yoke a suitable distribution.
In the prior art, as described in Japanese Patent Publication No. 2-11973, the crossover portion of the horizontal deflection coil on the fluorescent screen side is formed in a concave shape as viewed from the tube axis of the cathode ray tube.

[0004]

In the above-mentioned first prior art, it is necessary to dispose a pin extending substantially perpendicular to the winding surface along the funnel portion of the cathode ray tube at the time of winding. The manufacturing equipment was more complicated than the one that extends only in the tube axis direction.

In the above-mentioned second prior art, since the fluorescent screen side crossing portion of the horizontal deflection coil cannot be formed in a concave shape as viewed from the cathode ray tube tube axis by only simple winding, the fluorescent screen side crossing portion is made concave after winding. A molding facility was required, the manufacturing facility was complicated, and the coil conductor was easily damaged.

According to the present invention, the distortion of the raster can be reduced by providing a square deflection coil that can be produced by a relatively simple manufacturing facility and can have a suitable distribution of the horizontal deflection magnetic field.
It is an object of the present invention to provide a deflection yoke and a display device which have a reduced leakage magnetic field from the deflection yoke and a high horizontal deflection sensitivity associated therewith.

[0007]

According to the present invention, a horizontal deflection coil and a vertical deflection coil are attached to an electron gun for generating multiple electron beams in an in-line arrangement and a color cathode ray tube having a phosphor screen for displaying an image. A deflection yoke having
A video circuit for controlling the electron beam generation of the electron gun,
In a display device including a horizontal deflection circuit that supplies a horizontal deflection current to the horizontal deflection coil and a vertical deflection circuit that supplies a vertical deflection current to the vertical deflection coil, the deflection yoke includes at least one of the horizontal deflection coils. A collar-shaped portion formed by a pair of saddle-shaped coils, the phosphor-side crossing portion of the saddle-shaped coil being formed substantially at right angles to the cathode ray tube axis, and each coil conductor from the collar-shaped portion being an electron gun. And a curved portion that is curved and extends.

Since it is possible to form the horizontal deflection coil into the above-mentioned shape only by winding, it is necessary to dispose a pin extending substantially perpendicular to the winding surface along the funnel portion of the cathode ray tube at the time of winding. There is no need for a facility for molding the crossover portion of the fluorescent screen side into a concave shape after the winding, and the horizontal deflection coil can be manufactured relatively easily.

Further, by changing the magnetic field generated in the cross section of the phosphor screen side, the distribution of the horizontal deflection magnetic field suitable for reducing the distortion of the raster, reducing the leakage magnetic field from the deflection yoke and improving the horizontal deflection sensitivity therewith is improved. Can be formed.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially cutaway side view of a color cathode ray tube device having a deflection yoke according to the present invention.

Reference numeral 1 denotes a deflection yoke, which comprises a horizontal deflection coil 2, a main vertical deflection coil 3, a main core 4, a separator 5, a sub core 6, an auxiliary vertical deflection coil 7 and a terminal cover 8.
Reference numeral 9 is an electron gun, 10 is a static convergence magnet, 11 is a color cathode ray tube, and 12 is a fluorescent screen.

The deflection yoke 1 has a phosphor screen 12 on the front surface thereof, and the neck portion of a color cathode ray tube 11 to which an electron gun 9 for generating an in-line array of multiple electron beams is attached at the rear end of the rear neck portion. Attached to.

The main core 4 made of a magnetic material is the deflection yoke 1.
Are arranged on the outer circumference of the horizontal deflection coil 2 and the main vertical deflection coil 3. Further, an auxiliary vertical deflection coil 7 is wound around a sub-core 6 which is a U-shaped magnetic body and which is vertically opposed to each other, and is provided on the electron gun 9 side of the deflection yoke 1 of the deflection yoke 1.

FIG. 2 is a block diagram of a display device using the color cathode ray tube device according to the present invention.

This display device comprises a video circuit 3
0, a horizontal deflection circuit 31, a vertical deflection circuit 32, a high voltage circuit 33, and the like. By inputting signals corresponding to the video signal input terminal 27, the horizontal synchronizing signal input terminal 28, and the vertical synchronizing signal input terminal 29, the video circuit 30, the horizontal deflection circuit 31, the vertical deflection circuit 32, and the high voltage circuit 33 operate respectively. To do.

The horizontal deflection coil 31 is driven by the horizontal deflection circuit 31.
Is supplied with a horizontal deflection current I _H to generate a horizontal deflection magnetic field, and a vertical deflection circuit supplies a vertical deflection current I _V to the main vertical deflection coil 3 and the auxiliary vertical deflection coil 7 to generate a vertical deflection magnetic field. Controlled by the video circuit 30, the electron beam generated in the color cathode ray tube 11 is deflected from the electron gun 9.

FIGS. 3 and 4 are views showing a first embodiment of the horizontal deflection coil 2 used in the deflection yoke according to the present invention.

FIG. 3 is a side view in which a part of the horizontal deflection coil 2 is cut away, and FIG. 4 is a front view seen from the phosphor screen side. In each of the above figures, the fluorescent screen side end portion of the horizontal deflection coil 2 has fluorescent screen side connecting portions 2a and 2b for connecting the left and right coil conductors 2c. A feature of the present invention is that a collar-shaped portion 2a having a phosphor screen-side crossing portion formed substantially at right angles to a cathode ray tube axis, and coil conductors inclined and curved from the collar-shaped portion 2a toward the electron gun side. It is at a point formed by the extended curved portion 2b. As is apparent from the drawing, at the winding start portion, a curved portion is formed immediately after passing through a positioning pin 14 (described later) to form a crossover portion, and as the winding is continued, the pin 14 is wound. For a while after passing, a collar-shaped portion is formed and then a curved portion is formed in the middle of the winding.

In the horizontal deflection coil 2 having the above-described shape, a gap corresponding to the thickness t of the bending portion 2b is formed in the winding part of the portion where the bending is desired to occur, and a positioning pin is provided at the end of the bending portion 2b. By arranging 14, it can be formed only by performing a natural winding. That is, due to the tension applied to the coil conductors during winding, the coil conductors naturally move to a position substantially perpendicular to the curved surface 19 of the winding form, and each coil conductor has a shape inclined and curved toward the electron gun side. The curved portion 2b can be formed.

The positioning pin 14 arranged at the end of the curved portion 2b may extend substantially perpendicularly to the winding surface 19 along the funnel portion of the cathode ray tube, or the cathode ray tube axis. You may make it extend in a direction. Especially, in the latter case, the manufacturing equipment can be relatively simple. Alternatively, a member for fixing the position of at least the end of the curved portion 2b may be provided by being fixed to one of the winding forms.

Further, in the present invention, as shown in FIG.
The horizontal deflection coil 2 wound by the winding method has a larger curvature than the arc of the maximum inner diameter of the deflection yoke shown by the broken line 13 when the coil conductor of the curved portion 2b of the phosphor screen side crossing portion is viewed from the phosphor screen side. It is formed in an arc shape.

As shown in FIG. 5, the horizontal deflection magnetic field produced by the horizontal deflection coil 2 according to the present invention has a brim-shaped portion 2a in which the crossover portion on the phosphor screen side is formed substantially at right angles to the cathode ray tube axis.
The current loops 15a, 1 are substantially
The magnetic field 16b formed by 5b is added, resulting in a magnetic field as shown at 16a. Where 15
Reference numeral a is an actual current passage due to the formation of the curved portion according to the present invention, and reference numeral 15b is a current passage only by the collar-shaped portion of the conventional example, and the direction of the current is a direction for canceling the current. Therefore, the effect of changing the current path from the collar portion to the curved portion can be considered by replacing it with the current loop formed by 15a and 15b.

FIG. 5 shows the state of deflection in the right direction of the screen, and the horizontal deflection current flows through the horizontal deflection coil 2 in the direction of arrow 18. Therefore, the shape of the horizontal deflection magnetic field 16a on the phosphor screen side is strengthened to be a pincushion shape, and
In the middle horizontal deflection state in the upper and lower portions of the screen, the deflection force 17 in the direction opposite to the vertical deflection direction is added.

Therefore, the wavy raster distortion 20a at the upper and lower portions of the screen as shown in FIG. 6 is corrected in the direction of the arrow 21, and the wavy raster distortion 20b having a small amount can be formed.

The magnetic field that leaks to the fluorescent screen side of the deflection yoke and that hardly contributes to the horizontal deflection is the above-mentioned magnetic field 16.
The reduction in b reduces the inductance of the horizontal deflection coil and improves the horizontal deflection sensitivity. Further, there is an effect that the magnetic field leaking from the deflection yoke to the periphery of the display device can be reduced.

As shown in FIG. 3, the maximum width 22b of the curved portion 2b in the axial direction of the cathode ray tube is formed to be larger than the width 22a of the collar portion in the axial direction of the cathode ray tube.
The effect of improving the horizontal deflection sensitivity and the effect of reducing the leakage magnetic field from the deflection yoke to the periphery of the display device can be increased.

FIG. 7 is a front view showing a second embodiment of the horizontal deflection coil 2 used in the deflection yoke according to the present invention.

The second embodiment is different from the first embodiment in that an auxiliary coil 2d, a part of which is in close contact, is formed in the curved portion 2b of the fluorescent screen side transition portion of the horizontal deflection coil 2. . Also in this case, by forming the curved portion 2b as in the first embodiment, it is possible to improve the horizontal deflection sensitivity and reduce the magnetic field leaking from the deflection yoke to the periphery of the display device. That is, even if the auxiliary coil 2d is provided, the characteristic that each coil conductor of the bending portion 2b is formed so as to be inclined and bent toward the electron gun does not change.

Here, the provision of the auxiliary coil 2d has an effect of facilitating the formation of a desired magnetic field in terms of convergence. Further, since the auxiliary coil 2d is formed by partially adhering to the curved portion 2b of the transition portion on the phosphor screen side, the coil conductor at the beginning of winding can be pulled out from the phosphor screen side.

In order to manufacture the horizontal deflection coil 2 shown in FIG. 7, a member for controlling the position is provided inside the auxiliary coil 2d in the winding form, the auxiliary coil 2d is wound, and then the bending portion 2b is formed. The winding may be continued after projecting the pin 14 for controlling the position of the pin into the void of the winding form. Further, the shape and number of the auxiliary coils 2d in the present invention are not limited to those in the above embodiment.

Further, in the above-described embodiment of the present invention, an example in which the deflection yoke is provided with the auxiliary vertical deflection coil has been described.
The auxiliary vertical deflection coil may be provided if necessary. Further, the cathode ray tube provided with the deflection yoke of the present invention is not limited to the color cathode ray tube having the electron gun for generating the multiple electron beams in the in-line arrangement, but is a cathode ray tube having the electron gun for generating the single electron beam. May be.

[0033]

According to the present invention, the magnetic field generated in the vicinity of the cross section of the horizontal deflection coil on the phosphor screen side can be extremely weakened. As a result, the raster distortion is reduced, the horizontal deflection sensitivity is improved, and the deflection is increased. The magnetic field leaking from the yoke to the periphery of the display device can be reduced.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of a color cathode ray tube according to the present invention.

FIG. 2 is a block diagram of a display device using a color cathode ray tube according to the present invention.

FIG. 3 is a partially cutaway side view showing a first embodiment of a horizontal deflection coil used in a deflection yoke according to the present invention.

FIG. 4 is a front view showing a first embodiment of a horizontal deflection coil using a deflection yoke according to the present invention.

FIG. 5 is a diagram showing changes in the horizontal deflection magnetic field in the first embodiment of the horizontal deflection coil using the deflection yoke according to the present invention.

FIG. 6 is a schematic diagram illustrating correction of raster distortion by the horizontal deflection coil according to the present invention.

FIG. 7 is a front view showing a second embodiment of the horizontal deflection coil used in the deflection yoke according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Deflection yoke 2 Horizontal deflection coil 2a Collar portion 2b Curved portion 2d Auxiliary coil 3 Vertical deflection coil 4 Main core 5 Separator 6 Secondary core 7 Auxiliary vertical deflection coil 8 Terminal cover 9 Electron gun 10 Static convergence magnet 11 Color cathode ray tube 12 Fluorescence Surface 13 Dashed line 14 Pins 15a, 15b Current loop 16a, 16b Magnetic field 17 Deflection force 18 Arrow 19 Curved surface 20a, 20b Raster 21 Arrow 22a Width of collar part in cathode ray tube tube axial direction 22b Width of curved portion in cathode ray tube tube axial direction 30 Video Circuit 31 Horizontal Deflection Circuit 32 Vertical Deflection Circuit 33 High Voltage Circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Fukuma, 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Hitachi, Ltd. Multimedia system development headquarters (72) Inventor Katsuyuki Kawakami Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa 292 Company Hitachi Ltd., Multimedia Systems Development Headquarters (72) Inventor Hiroshi Yoshioka 3300 Hayano, Mobara-shi, Chiba Hitachi Ltd. Electronic Device Division (72) Inventor Soichi Sakurai Yoshida Totsuka-ku, Yokohama, Kanagawa 292, Machi, Ltd. Hitachi, Ltd., Multimedia Systems Development Division (72) Inventor Takanori Ishikawa 1 Kitano, Masaki, Mizusawa-shi, Iwate Hitachi Media Electronics Co., Ltd.

Claims (7)

[Claims] 1. An electron gun for generating an electron beam and a cathode ray tube having a phosphor screen for displaying an image,
In a deflection yoke having a horizontal deflection coil and a vertical deflection coil, the horizontal deflection coil is composed of at least one pair of saddle-shaped coils, and the cross section of the phosphor-shaped side of the saddle-shaped coils is substantially perpendicular to the cathode ray tube tube axis. A deflection yoke, comprising: a formed collar-shaped portion; and a curved portion in which each coil conductor extends from the collar-shaped portion toward the electron gun side while being inclined and curved. 2. A color equipped with an in-line array electron gun for generating multiple electron beams and a deflection cathode having a horizontal deflection coil and a vertical deflection coil attached to a color cathode ray tube having a fluorescent screen for displaying an image. In the cathode ray tube device, the horizontal deflection coil is composed of at least one pair of saddle-shaped coils, and the cross section of the saddle-shaped coil on the phosphor screen side is formed substantially at right angles to the cathode ray tube tube axis, and 1. A color cathode ray tube device, wherein each coil conductor is formed from a flange-shaped portion and a curved portion that is inclined and curved toward the electron gun side. 3. An electron gun for generating a multi-electron beam in an in-line arrangement and a deflection yoke having a horizontal deflection coil and a vertical deflection coil, which is attached to a color cathode ray tube having a fluorescent screen for displaying an image, said electron gun. A video circuit that controls the generation of an electron beam, a horizontal deflection circuit that supplies a horizontal deflection current to the horizontal deflection coil, and a vertical deflection circuit that supplies a vertical deflection current to the vertical deflection coil. A horizontal deflection coil is composed of at least one pair of saddle-shaped coils, and a brim-shaped portion in which a cross section of the phosphor-shaped side of the saddle-shaped coil is formed substantially at right angles to a cathode ray tube tube axis, and each of the brim-shaped portions is formed. A display device, wherein a coil conductor is formed by a curved portion that is inclined and curved toward the electron gun side. 4. The coil conductor according to any one of claims 1 to 3, wherein the coil conductor of the curved portion is formed in an arc shape having a curvature larger than an arc of a maximum inner diameter of the deflection yoke when viewed from the phosphor screen side. A deflection yoke, or a color cathode ray tube device or a display device including the deflection yoke. 5. The deflection yoke according to any one of claims 1 to 3, wherein the curved portion is formed to have a substantially constant thickness, or a color cathode ray tube device including the deflection yoke, or Display device. 6. The cathode ray tube tube axial direction maximum width of the curved portion is formed to be larger than the cathode ray tube tube axial direction width of the collar portion according to any one of claims 1 to 3. A deflection yoke, or a color cathode ray tube device or a display device including the deflection yoke. 7. The deflection yoke according to any one of claims 1 to 3, characterized in that an auxiliary coil is formed by partially adhering to the curved portion, or a color cathode ray provided with the deflection yoke. Tube device or display device.