JPH1140076A - Cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cathode-ray tube that suppresses pincushion distortions at the upper and lower sides of its rectangular raster sufficiently through individual and free control of horizontal and vertical deflection-field distortions of its deflection yoke at the screen side. SOLUTION: A cathode-ray tube comprises a cathode-ray tube 1, an electron gun and a deflection yoke 11. The yoke 11 is made up of a horizontal saddle coil 4, an insulating frame 5 and a vertical saddle coil 6, and is mounted with a ferrite core 7 on the gun-side periphery of the horizontal coil 4, frame 5 and vertical coil 6 overlapped one on another and with an additional saddle coil 10 on the periphery facing a glass panel 2. The additional coil 10 is partly connected to the horizontal coil 4 and also partly to the vertical coil 6 to correct pincushion distortions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube device, and more particularly to a deflection yoke constituting a cathode ray tube device.

[0002]

2. Description of the Related Art In a cathode ray tube apparatus used for a display monitor in recent years, with the spread of software in which necessary information is frequently displayed also on a peripheral portion of a screen, a fine image display which is easy to see also on a peripheral portion of the screen is provided. Is required. One of the important factors that determine the image quality at the peripheral portion of the screen is raster distortion, and the demands on the market for raster distortion have become extremely strict. In particular, raster distortion, which is generally called pincushion distortion, is one of the factors that degrade image quality, and it is necessary to avoid this pincushion distortion in order to obtain good image quality.

However, the screen of recent cathode ray tube devices has been flattened from the viewpoint of visibility, and the remarkable increase in pincushion distortion due to the flattening has become a major problem in designing a deflection yoke. I have.
In addition, pincushion distortion generated on the upper and lower sides of the rectangular raster projected on the screen of the cathode ray tube device needs to be corrected by the deflection yoke itself from the viewpoint of multi-scan. For that purpose, it is necessary to design a deflection yoke having a magnetic field distribution capable of realizing both the correction of the pincushion distortion and the convergence characteristic.

In order to reduce the above-mentioned pincushion distortion, as a deflection yoke constituting a recent cathode ray tube device, for example, as shown in Japanese Patent Application Laid-Open No. 62-193050, a horizontal saddle coil is provided with a vertical saddle coil. There is a configuration in which a coil extends to the screen side and an annular core is disposed outside the extended portion. According to this deflection yoke, pincushion distortion generated on the upper side and the lower side of the rectangular raster can be reduced.

As another deflection yoke, Japanese Patent Publication No.
As shown in JP-A-46944, there is a structure in which a saddle-shaped auxiliary coil having a winding angle of about 30 ° is connected to the horizontal saddle coil on the screen side. According to this deflection yoke, fourth-order raster distortion generated on the upper side and the lower side of the rectangular raster can be reduced.

[0006]

However, in the technique disclosed in Japanese Patent Application Laid-Open No. 62-193050, the strength of the horizontal deflection magnetic field on the screen side is increased (the effective length is extended toward the screen side). As a result, the pincushion distortion generated on the upper side and the lower side of the rectangular raster is reduced, so that it is difficult to control the distortion of the horizontal deflection magnetic field on the screen side alone. Further, in order to reduce the pincushion distortion, the distortion of the vertical deflection magnetic field on the screen side cannot be actively controlled and utilized.

In the technique disclosed in Japanese Patent Publication No. 3-46944, the distortion of the horizontal deflection magnetic field on the screen side is independently controlled in order to reduce the pincushion distortion. The distortion of the vertical deflection magnetic field cannot be actively controlled and utilized.

The present invention has been made to solve such a problem, and a deflection yoke capable of independently and freely controlling distortion of a horizontal deflection magnetic field and a vertical deflection magnetic field on a screen side, and a deflection yoke capable of controlling the deflection yoke. It is an object of the present invention to provide a cathode ray tube device capable of sufficiently reducing pinch distortion generated on the upper side and the lower side of a rectangular raster by using a deflection yoke.

[0009]

According to the present invention, there is provided a cathode ray tube apparatus having a glass panel having a screen on an inner surface thereof, a cathode ray tube main body having a funnel comprising a cone and a neck, and In a cathode ray tube device including a deflection yoke provided on an outer peripheral portion of a neck portion of the funnel, the deflection yoke includes a horizontal saddle coil, an insulating frame provided outside the vertical yoke, and a vertical saddle coil provided outside the horizontal saddle coil. A saddle coil and a ferrite core provided outside the saddle coil, and a saddle-type additional coil is provided between the screen-side end surface of the ferrite core and the screen. The additional coil has two or more pairs. And at least one pair of coil portions constituting the additional coil is connected to the horizontal saddle coil, Other coil portions constituting the pressure coil, characterized in that it is connected to the vertical saddle coil. According to the cathode ray tube device of the present invention, by providing the additional coil, it is possible to independently and freely control the deflection of the horizontal and vertical deflection magnetic fields on the screen side of the deflection yoke. Therefore, it is possible to obtain a cathode ray tube device in which pincushion distortion generated on the upper side and the lower side of the rectangular raster is sufficiently reduced.

[0010] In the cathode ray tube device according to the present invention, it is preferable that the additional coil is mounted on an insulating frame provided outside the vertical saddle coil. According to this preferred example, since the additional coil is mounted via the insulating frame, the additional coil can be easily fixed at an appropriate position.

Further, in the cathode ray tube device according to the present invention, it is preferable that the additional coil is wound around an insulating frame having a winding groove provided outside the vertical saddle coil. According to this preferred example, it is possible to form an additional coil having a predetermined winding angle by directly winding a wire around the insulating frame having the winding groove. There is no need to mold it. Therefore, the number of steps for forming the deflection yoke can be reduced.

Further, in the cathode ray tube device according to the present invention, it is preferable that an additional ferrite core is provided outside the additional coil. According to this preferred example, by providing the additional ferrite core, the magnetic field intensity on the screen side of the deflection yoke can be further increased. Therefore, the effect of reducing the pincushion distortion generated on the upper side and the lower side of the rectangular raster can be further enhanced.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, 41 cm
(17 inch) 90 ° CRT will be described as an example.

<First Embodiment> FIG. 1 is a partial sectional view of a cathode ray tube apparatus according to a first embodiment of the present invention. In FIG. 1, the tube axis of the cathode ray tube device is the Z axis,
The horizontal axis of the screen surface of the cathode ray tube device located on the Z axis is the X axis, and the vertical axis of the screen surface of the cathode ray tube device located on the Z axis is the Y axis.

The cathode ray tube device according to the present embodiment has a cathode ray tube main body 1 having a glass panel 2 having a screen on the inner surface and a funnel 3 having a cone portion and a neck portion.
And an electron gun (not shown) provided at (inside) the neck of the funnel 3, and a deflection yoke 11 provided at the outer periphery of the neck of the funnel 3.

The deflection yoke 11 includes an insulating frame 5 made of plastic or the like, a horizontal saddle coil 4 provided inside the insulating frame 5, and a vertical saddle coil 6 provided outside the insulating frame 5. , A ferrite core 7 and an additional coil 10. Ferrite core 7
Is provided around the rear portion (electron gun side portion) of the overlapping portion of the horizontal saddle coil 4, the insulating frame 5, and the vertical saddle coil 6. The additional coil 10 is provided around a front portion (screen side portion) of an overlapping portion of the horizontal saddle coil 4, the insulating frame 5, and the vertical saddle coil 6. In other words, the additional coil 10 is
Is provided outside the vertical saddle coil 6 in a region sandwiched between the screen-side opening end face 8 and the screen-side end face 9 of the ferrite core 7.

The additional coil 10 will be specifically described. The additional coil 10 includes a first coil portion 12 and a second coil portion 13 each wound in a pair of saddles.
It is composed of The first coil portion 12 is wound in a saddle shape so that the winding angle is in a range of 1 ° to 18 ° with respect to the X axis.
Are wound in a saddle shape such that the winding angle is in the range of 72 ° to 89 ° with respect to the X axis. The total length of each coil portion in the Z-axis direction is the first coil portion 12
Is formed to be 50 mm, and the second coil portion 13 is formed to be 40 mm. The number of turns of each coil portion is set to 50% of the number of turns of the horizontal saddle coil 4 in the first coil portion 12 and to 35% of the number of turns of the vertical saddle coil 6 in the second coil portion 13. The first coil portion 12 is connected to the horizontal saddle coil 4, and the second coil portion 13 is connected to the vertical saddle coil 6. The respective coil portions reduce the pincushion distortion at the upper and lower sides of the rectangular raster. A horizontal deflection magnetic field and a vertical deflection magnetic field that can be reduced (corrected) can be generated.

FIG. 2 is a diagram for explaining the principle that the first coil portion 12 constituting the additional coil 10 can reduce pincushion distortion on the upper side and the lower side of the rectangular raster. As shown in FIG. 2, when the electron beam 14 is deflected to the center of the upper and lower sides of the screen and the corner, the horizontal deflection magnetic field 15 generated by the first coil portion 12 acts on the electron beam 14. Thus, pincushion distortion can be reduced. Specifically, the component of the Lorentz force 16 acting on the electron beam 14 by the horizontal deflection magnetic field 15 in the Y-axis direction is zero at the center of the upper and lower sides of the screen, is downward at the upper corner, and is lower at the lower corner. Since it is upward, pincushion distortion at the upper side and the lower side of the rectangular raster can be corrected.

FIG. 3 is a diagram for explaining the principle that the second coil portion 13 constituting the additional coil 10 can reduce pincushion distortion on the upper side and the lower side of the rectangular raster. As shown in FIG. 3, when the electron beam 17 is deflected to the center of the upper and lower sides of the screen and the corner, the vertical deflection magnetic field 18 generated by the second coil portion 13 acts on the electron beam 17. Thus, pincushion distortion can be reduced. Specifically, the component of the Lorentz force 19 in which the vertical deflection magnetic field 18 acts on the electron beam 17 in the Y-axis direction is maximized upward at the center of the upper side of the screen, is minimized upward at the corner of the upper side, and the screen Since it becomes maximum downward at the center of the lower side and minimum at the corner at the lower side, pincushion distortion at the upper side and the lower side of the rectangular raster can be corrected.

According to the cathode ray tube device of this embodiment,
The amounts of pincushion distortion on the upper side and the lower side of the rectangular raster corrected by the first coil portion 12 and the second coil portion 13 constituting the additional coil 10 are 0.85 mm and 0.5 mm, respectively. 1.35m in total
It was confirmed that there was an effect of reducing m.

As described above, according to the present embodiment, the first coil portion 12 and the second coil portion 13 constituting the additional coil 10 are arranged on the screen side of the deflection yoke 11 so as to have a strong horizontal position. A deflection magnetic field and a vertical deflection magnetic field are generated. These deflection magnetic fields can be freely controlled by independently adjusting the first coil portion 12 and the second coil portion 13 without depending on the horizontal saddle coil 4 and the vertical saddle coil 6. it can. Therefore, according to the present embodiment, the first coil portion 12 and the second coil portion 13 are appropriately combined,
By obtaining these synergistic effects, it becomes possible to optimally correct the pincushion distortion on the upper side and the lower side of the rectangular raster.

In this embodiment, the case where the additional coil 10 wound in a saddle shape is directly attached to the outside of the vertical saddle coil 6 has been described, but the present invention is not limited to this configuration. Instead, a structure for holding the additional coil 10 (for example, a holding frame formed using resin or the like) is provided outside the vertical saddle coil 6, and the additional coil 10 is mounted and fixed to the vertical saddle coil 6. It may be.

<Second Embodiment> FIG. 4 is a partial sectional view of a cathode ray tube device according to a second embodiment of the present invention. In FIG. 4, as in FIG. 1, the tube axis of the cathode ray tube device is the Z axis, the horizontal axis of the screen surface of the cathode ray tube device located on the Z axis is the X axis, and the cathode ray tube device located on the Z axis. Is defined as the Y axis.

The cathode ray tube device according to the present embodiment has basically the same structure as the cathode ray tube device according to the first embodiment, and has a glass panel 2 having a screen on the inner surface.
1, a cathode ray tube main body 20 having a funnel 22 having a cone portion and a neck portion, an electron gun (not shown) provided inside the neck portion of the funnel 22, and an outer peripheral portion of the neck portion of the funnel 22. Deflection yoke 30
And is configured using The present embodiment is different from the first embodiment only in the structure of the deflection yoke.

The deflection yoke 30 constituting the cathode ray tube device according to the present embodiment is provided inside a first insulating frame 24 made of plastic or the like. Horizontal saddle coil 23 and first insulating frame 2
4, a vertical saddle coil 25, a ferrite core 26, an additional coil 29, and a second insulating frame 31 provided for winding the additional coil 29. . The ferrite core 26 is provided around the rear portion (electron gun side portion) of the overlapping portion of the horizontal saddle coil 23, the first insulating frame 24, and the vertical saddle coil 25. The second insulating frame 31 is provided around a front portion (screen side portion) of an overlapping portion of the horizontal saddle coil 23, the first insulating frame 24, and the vertical saddle coil 25. An additional coil 29 is wound around 31. In other words, the additional coil 29 is provided outside the vertical saddle coil 25 in a region sandwiched between the screen-side opening end surface 27 of the first insulating frame 24 and the screen-side end surface 28 of the ferrite core 26. It is wound around the insulating frame 31.

The additional coil 29 is wound around the second insulating frame 31, as described above. The second insulating frame 31 is formed using an insulating material such as plastic, and the second insulating frame 31 has a winding groove 31a partitioned by a plurality of ribs 31b. This winding groove 31a is used to form the additional coil 29 when the wire is directly wound around the second insulating frame 31 in a saddle shape to form the additional coil 29.
Is formed in advance in such a shape that the winding angle becomes a predetermined winding angle. That is, the plurality of ribs 31b are provided at predetermined positions, and the region of the winding groove 31a is formed so as to obtain a predetermined winding angle. Therefore, according to the present embodiment, the second insulating frame 3 in which the winding groove 31a is formed
1, an additional coil 29 having a predetermined winding angle can be formed by directly winding a wire,
It is not necessary to form the deflection yoke 30 in advance into a saddle shape, and the number of steps for forming the deflection yoke 30 can be reduced.

In this embodiment, as in the first embodiment, the additional coil 29 is composed of a first coil portion 32 and a second coil portion 33 each wound in a pair of saddles. Have been. The first coil portion 32
The winding angle is wound in a saddle shape so that the winding angle is in a range of 1 ° to 18 ° with respect to the X axis. The second coil portion 33 has a winding angle of 72 ° with respect to the X axis. From 89 °
It is wound in a saddle shape so as to be in the range. The total length of each coil portion in the Z-axis direction is 50 mm for the first coil portion 32 and 40 mm for the second coil portion 33. The number of turns of each coil portion is such that the first coil portion 32 is 50 times the number of turns of the horizontal saddle coil 23.
%, The second coil portion 33 is 3 of the vertical saddle coil 25
It is set to 5%. Then, the first coil portion 32
Is connected to the horizontal saddle coil 23, and the second coil portion 33 is connected to the vertical saddle coil 25.

That is, the deflection yoke 30 according to the present embodiment
Has basically the same structure as the deflection yoke 11 according to the first embodiment except that the additional coil 29 is wound around the second insulating frame 31 and provided outside the vertical saddle coil 25. Have. Therefore, when the deflection yoke 30 according to the present embodiment is mounted on the cathode ray tube main body 20, the upper side and the lower side of the rectangular raster are formed according to the same principle as that described in the first embodiment (see FIGS. 2 and 3). And the pincushion distortion can be optimally corrected.

<Third Embodiment> FIG. 5 is a partial sectional view of a cathode ray tube device according to a third embodiment of the present invention. In FIG. 5, as in FIGS. 1 and 4, the tube axis of the cathode ray tube device is the Z axis, the horizontal axis of the screen surface of the cathode ray tube device located on the Z axis is the X axis, and the cathode axis is located on the Z axis. The Y axis is the vertical axis of the screen surface of the cathode ray tube device.

The cathode ray tube device according to the present embodiment has basically the same structure as the cathode ray tube devices according to the first and second embodiments, except for the structure of the deflection yoke. .

The deflection yoke 50 constituting the cathode ray tube device according to the present embodiment has a structure in which an additional ferrite core 34 is provided outside the additional coil of the deflection yoke according to the first embodiment. In the present embodiment, the electron gun side end surface 35 and the screen side end surface 36 of the additional ferrite core 34 are respectively connected to the electron gun side end surface 38 of the additional coil.
However, the present invention is not limited to this structure. For example, an additional ferrite core 34 is provided so as to cover the entire additional coil. Is also good. Further, the electron gun side end surface 35 and the screen side end surface 36 of the additional ferrite core 34 may be assembled so as not to be in contact with the electron gun side end surface 38 and the screen side end surface 39 of the additional coil.

According to the cathode ray tube device of the present embodiment,
The effect of the additional ferrite core 34 attached to the outside of the additional coil makes it possible to further increase the magnetic field strength on the screen side, thereby reducing the pincushion distortion generated on the upper and lower sides of the rectangular raster. Can be further strengthened. According to the experiment, it was confirmed that an effect approximately 1.6 times as large as the effect in the first embodiment was obtained. That is, as described above, the reduction effect of 1.35 mm in the first embodiment is 2.16 mm in the present embodiment.

In this embodiment, the case where the additional ferrite core is provided outside the additional coil according to the first embodiment has been described. However, the present invention is not limited to this structure. An additional ferrite core may be provided outside the additional coil according to the second embodiment.

In each of the above embodiments of the present invention, the horizontal saddle coil and the vertical saddle coil are formed such that the flange portions at the screen-side ends thereof are formed along the funnel shape of the cathode ray tube, and these coils are formed. The case where the additional coils are provided so as to overlap each other has been described. However, the present invention is not limited to this configuration. By providing the additional coil closer to the screen than the screen-side end of the ferrite core of the deflection yoke, the above-described special effects of the present invention can be obtained.

Further, in each of the first to third embodiments according to the present invention described above, the additional coil comprises a total of two pairs of coil portions, a first coil portion and a second coil portion. However, the present invention is not limited to this configuration. For example, the additional coil may be configured to include three or more pairs of coil portions.

[0036]

As described above, according to the present invention,
A deflection yoke that can independently and freely control the distortion of the horizontal deflection magnetic field and the vertical deflection magnetic field on the screen side by an additional coil disposed on the screen side of the deflection yoke, and a rectangular raster by using this deflection yoke And a cathode ray tube device capable of sufficiently reducing the pinch distortion generated on the upper side and the lower side.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a cathode ray tube device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a principle that a first coil portion of an additional coil, which is a main element of a deflection yoke constituting the cathode ray tube device of FIG. 1, can reduce pincushion distortion at the upper side and the lower side of a rectangular raster; Diagram for explaining

FIG. 3 shows a principle that a second coil portion of an additional coil, which is a main element of the deflection yoke constituting the cathode ray tube device of FIG. 1, can reduce pincushion distortion at the upper side and the lower side of the rectangular raster. Diagram for explaining

FIG. 4 is a partial cross-sectional view of a cathode ray tube device according to a second embodiment of the present invention.

FIG. 5 is a partial cross-sectional view of a cathode ray tube device according to a third embodiment of the present invention.

[Explanation of symbols]

 1,20 cathode ray tube main body 2,21 glass panel 3,22 funnel 4,23 horizontal saddle coil 5 insulating frame 6,25 vertical saddle coil 7,26 ferrite core 8 screen-side opening end surface of insulating frame 9,28 ferrite core Screen-side end face 10, 29 Additional coil 11, 30, 50 Deflection yoke 12, 32 First coil part 13, 33 Second coil part 24 First insulating frame 27 Screen-side opening end face 31 of first insulating frame 31 Second insulating frame 31a Winding groove 31b Rib 34 Additional ferrite core 35 Electron gun side end surface of additional ferrite core 36 Screen side end surface of additional ferrite core 38 Electron gun side end surface of additional coil 39 Screen side end surface of additional coil

Claims (4)

[Claims] 1. A cathode ray tube comprising: a glass panel having a screen on its inner surface; a cathode ray tube main body having a funnel comprising a cone portion and a neck portion; and a deflection yoke provided on an outer peripheral portion of the neck portion of the funnel. In the apparatus, the deflection yoke includes a horizontal saddle coil, an insulating frame provided outside the same, a vertical saddle coil provided outside the same, and a ferrite core provided outside the same. A saddle-type additional coil is provided between the screen side end face of the screen and the screen, and the additional coil is composed of two or more coil portions, and at least one pair of coils constituting the additional coil Part is connected to the horizontal saddle coil, and another coil part constituting the additional coil is connected to the vertical saddle coil. Cathode ray tube apparatus characterized by being. 2. The apparatus according to claim 1, wherein the additional coil is mounted on an insulating frame provided outside the vertical saddle coil.
A cathode ray tube device according to item 1. 3. The cathode ray tube device according to claim 1, wherein the additional coil is wound around an insulating frame having a winding groove provided outside the vertical saddle coil. 4. The cathode ray tube device according to claim 1, wherein an additional ferrite core is provided outside the additional coil.