CN1118850C - Biased rotating coil and color kinescope - Google Patents

Abstract

A deflection yoke for a cathode ray tube can correct both the pincushion distortion at the upper and lower edges of the screen and the misconvergence of the screen at the same time by the deflection yoke itself without the need for a correction magnet. The deflection yoke comprises a saddle shaped horizontal deflection coil 1, a saddle shaped vertical deflection coil 2 located outside the horizontal deflection coil 1, and a high permeability core 3 located outside the vertical deflection coil. The core 3 has notch portions 7 at the center parts of the upper and lower portions of the screen side end.

Description

Deflection yoke and color picture tube equipped with the deflection yoke

The invention relates to a deflection yoke and a color display tube equipped with the deflection yoke.

In color picture tubes used in display monitors in recent years, such as windows, information is frequently displayed around the fluorescent screen surface, so it is required to display fine images in this area. Grating distortion is an important factor that determines the image quality of the peripheral part of the fluorescent surface. For the pincushion deflection distortion at the upper and lower ends of the fluorescent screen (hereinafter referred to as: grating pincushion distortion) or grating distortion, the magnetic field distribution of the deflection yoke itself determines its quality. very strict. At the same time, the content of the convergence requirements at the periphery of the fluorescent screen becomes very strict.

However, the self-converging deflection yoke installed and used on a color picture tube equipped with electron guns arranged in a line is shown in Figures 22 and 23. The saddle-shaped vertical deflection winding 25 is composed of a high magnetic permeability magnetic core 26 arranged outside the vertical deflection winding 25 . And in the self-converging deflection yoke, the magnetic field generated by the horizontal deflection winding 24 forms a pincushion magnetic field, and the magnetic field generated by the vertical deflection winding 25 forms a barrel-shaped magnetic field, so that the pincushion distortion of the grating on the upper and lower ends of the phosphor screen and the pincushion on the phosphor screen Misconvergence is compensated for both at the same time.

In recent years, with the increase of the radius of curvature of the picture tube, the "positive anisotropic astigmatism" as shown in Figure 24 occurs on the fluorescent screen, and the grating pincushion distortion at the upper and lower ends of the fluorescent screen also tends to increase.

The phenomenon of positive anisotropic astigmatism is explained here. In Fig. 24, B, G, R represent 3 electron beam emitting sources viewed from this side of the fluorescent screen, the dotted line 27 is the blue figure produced by the electron beam emitted from the electron beam emitting source B, and the single dotted line 28 is The red pattern generated by the electron beam emitted from the electron beam emitting source R, and the solid line 29 is the green pattern generated by the electron beam emitted from the electron beam emitting source G. In the upper right quadrant of the fluorescent screen, relative to the green figure (solid line) 29, the red figure (single dotted line) 28 and the blue figure (dotted line) 27 appear below and above respectively, and the red figure (single dotted line) ) 28 and the blue figure (dotted line) 27 intersect to form an X on the vertical axis. And in the upper left second quadrant of the phosphor screen, the relationship between the red graphic (single dash line) 28 and the blue graphic (dotted line) 27 is opposite to that of the first quadrant. Below the fluorescent screen surface, it is in a line-symmetrical relationship with the horizontal axis as the reference. This is called "positive anisotropic astigmatism".

In the traditional self-converging deflection yoke, in order to compensate for the positive anisotropic astigmatism on the fluorescent surface, if the magnetic field generated by the vertical deflection winding 25 is changed into a stronger barrel-shaped magnetic field, the pincushion shape of the grating at the upper and lower ends of the fluorescent screen will be distorted. further increase. In addition, in order to compensate the grating pincushion distortion at the upper and lower ends of the fluorescent screen, if the magnetic field generated by the horizontal deflection winding 24 is changed into a stronger pincushion magnetic field, the positive anisotropic astigmatism tends to increase further. The grating pincushion distortion at the end and the misconvergence on the phosphor screen cannot be compensated at the same time.

As far as the deflection yoke that constitutes the deflection coil is concerned, although the magnetic field distribution from its fluorescent screen side to the electron gun side is generally related to the compensation of convergence misalignment on the fluorescent screen surface, as far as the pincushion distortion of the grating at the upper and lower ends of the fluorescent screen surface is concerned, the fluorescent screen side of the deflection yoke The magnetic field distribution is related to this. The reason is that when the electron beam is deflected, the distance between the electron beam and the deflection winding on the side of the deflection screen is smaller than that on the side of the electron gun, and on the side of the screen of the deflection winding, since the end of the electron beam bent along the magnetic force line Therefore, the effect of magnetic field distribution on the side of the phosphor screen where pincushion distortion of the grating at the upper and lower ends of the phosphor screen surface is generated becomes greater.

As can be seen from the above, in order to compensate the pincushion distortion of the grating at the upper and lower ends of the fluorescent screen by using the deflection yoke, the pincushion magnetic field on the fluorescent screen side of the deflection yoke must be strengthened. In addition, in order to compensate the misconvergence on the phosphor screen generated in this state, it is necessary to strengthen the barrel magnetic field near the middle portion of the deflection yoke except the phosphor screen side and the electron gun side.

In response to these demands, a method has been proposed to achieve both compensation and convergence of pincushion distortion of the upper and lower gratings on the phosphor screen by providing compensation magnets on the upper and lower portions of the phosphor screen side of the deflection yoke (JP-A-2-204947).

In the self-converging deflection yoke, the magnetic field generated by the horizontal deflection coil 24 must have strong pincushion distortion in order to eliminate raster distortion at the upper and lower ends of the phosphor screen through the magnetic field distribution of the deflection yoke itself (see FIG. 14 ). However, when up to 4-order pincushion distortion is included here, high-order up-and-down grating distortion called gull-wing occurs. This gull-wing shape visually degrades the image quality considerably and must be avoided.

In order to meet these requirements, US Pat. No. 4,233,582 proposes a method of reducing the gull-wing shape at the upper and lower ends of the phosphor screen by providing a concave shape in the center of the phosphor screen side flange portion of the horizontal deflection winding. And in U.S. Patent No. 4,229,720, a method of reducing the gull-wing shape at the upper and lower ends of the fluorescent screen is proposed by making the flange of the horizontal deflection winding into a polygonal shape. In addition, JP-A-63-289748 proposes a method of reducing the gull-wing shape at the upper and lower ends of the fluorescent screen by arranging compensating magnets having convex portions on the upper and lower sides of the fluorescent screen.

However, in the method disclosed in JP-A-2-204947, there is the following problem. Because compensation and convergence of the grating pincushion distortion on the upper and lower ends of the fluorescent screen are achieved by arranging compensation magnets, the number of components is increased, and the compensation magnets in the manufacturing process The magnetization dispersion is also large.

In the method disclosed in US Pat. No. 4,233,582, the possibility of damage to the winding wire due to abnormal stretching increases during the stamping process in which a concave shape is provided in the center of the flange portion of the phosphor screen side of the horizontal deflection winding. If the concave shape is made too deep, because when the deflection yoke is installed on the picture tube, the concave shape is on the cone of the picture tube, so it is difficult to form a sufficient concave shape to remove the gull-wing shape, and there is a manufacturing problem. and design issues. Also, in the method disclosed in US Patent No. 4,229,720, there is a problem in its manufacture that the vertices of the polygonal corners of the phosphor screen side flange portion of the horizontal deflection winding are more likely to be damaged due to abnormal deformation of the winding wire. Also, the method disclosed in Japanese Unexamined Patent Application Publication No. 63-289748 has problems in that the number of components increases due to the provision of compensation magnets, and the dispersion of magnetization of the compensation magnets increases during the manufacturing process.

In order to solve the aforementioned problems of the conventional technology, the present invention aims to provide such a deflection yoke, which can simultaneously compensate the pincushion distortion of the upper and lower ends of the fluorescent screen and the misconvergence on the fluorescent screen by using only the deflection yoke itself. Another object of the present invention is to provide a deflection yoke capable of sufficiently reducing the gull-wing profile without damaging the winding wires at the flanges on the screen side and without increasing the number of components when the horizontal deflection winding is wound. The purpose of the present invention is also to provide a color picture tube, which can compensate pincushion distortion and misconvergence of the grating at the same time, so as to improve the image quality. In addition, the object of the present invention is to provide a color picture tube, which can sufficiently reduce the gull-wing shape and improve the image quality.

In order to achieve the above object, according to the first solution of the self-converging deflection coil of the present invention, it at least includes a saddle-type horizontal deflection winding, a saddle-type vertical deflection winding arranged outside the aforementioned saddle-type horizontal deflection winding, and a saddle-type vertical deflection winding arranged outside the aforementioned saddle-type vertical deflection winding. The magnetic core outside the deflection yoke is characterized in that the reluctance of the magnetic core is larger at the upper and lower central portions at one end of the fluorescent screen than at the left and right.

The above-mentioned first scheme of the deflection coil of the present invention can be improved as follows:

A cutout is provided at the upper and lower central parts of one end of the fluorescent screen of the magnetic core;

The wall thickness of the upper and lower central parts of one side of the fluorescent screen of the magnetic core is thinner than that of the left and right sides;

The upper and lower central portions of the fluorescent screen side end of the magnetic core are made of a material having a lower magnetic permeability than the left and right sides.

According to the second solution of the self-converging deflection coil of the present invention, it includes at least a saddle-shaped horizontal deflection winding, a saddle-shaped vertical deflection winding arranged outside the aforementioned saddle-shaped horizontal deflection winding, and a magnetic field arranged outside the aforementioned saddle-shaped vertical deflection winding. The magnetic core is characterized in that the reluctance of the upper and lower central parts of the fluorescent screen side end and the electron gun side end of the aforementioned magnetic core is larger than that of the left and right sides.

The second scheme of the above-mentioned deflection coil of the present invention can be improved as follows:

A cutout is provided at the upper and lower central parts of the fluorescent screen side end of the magnetic core and the electron gun side end;

The wall thickness of the upper and lower central parts of the fluorescent screen side end of the magnetic core and the electron gun side end is thinner than that of the left and right sides;

The upper and lower central portions of the fluorescent screen side end and the electron gun side end of the magnetic core are made of a material having a lower magnetic permeability than the left and right sides.

According to the first scheme of the color display tube equipped with self-converging deflection yoke of the present invention at least comprises, the vacuum tube that is made up of glass panel and the glass funnel that connects glass panel rear portion; Be arranged on the electron gun of aforementioned vacuum tube rear portion; Set A saddle-shaped horizontal deflection winding on the outer periphery of the rear part of the aforementioned vacuum tube; a saddle-shaped vertical deflection winding arranged outside the aforementioned saddle-shaped horizontal deflection winding; a magnetic core arranged outside the aforementioned saddle-shaped vertical deflection winding, characterized in that the aforementioned magnetic core The magnetoresistance at the upper and lower central portions of one side of the fluorescent screen is larger than that at the left and right.

The first scheme of the above-mentioned color display tube of the present invention can be improved as follows respectively:

A cutout is provided at the upper and lower central parts of one end of the fluorescent screen of the magnetic core;

The wall thickness of the upper and lower central parts of the magnetic core at one side of the fluorescent screen is thinner than that of the left and right sides;

The magnetic core is made of a material whose magnetic permeability is lower than that of the left and right sides at the upper and lower central portions of one end of the fluorescent screen.

According to the second scheme of the color picture tube equipped with self-converging deflection coils of the present invention, at least comprising, a vacuum tube made of a glass panel and a glass cone connected to the rear of the glass panel; an electron gun arranged at the rear of the aforementioned vacuum tube; A saddle-shaped horizontal deflection winding arranged on the outer periphery of the rear part of the aforementioned vacuum tube; a saddle-shaped vertical deflection winding arranged outside the aforementioned saddle-shaped horizontal deflection winding; a magnetic core arranged outside the aforementioned saddle-shaped vertical deflection winding, characterized in that the aforementioned magnetic The reluctance of the core at the upper and lower central portions of the fluorescent screen side end and the electron gun side end is larger than that of the left and right sides.

The second scheme of the above-mentioned color display tube of the present invention can be improved as follows respectively:

A cutout is provided at the upper and lower central parts of the fluorescent screen side end of the magnetic core and the electron gun side end;

The wall thickness of the magnetic core at one side of the phosphor screen and the upper and lower central parts of the electron gun side is thinner than that of the left and right sides;

The magnetic core is made of a material having a lower magnetic permeability than that of the left and right sides at the upper and lower central portions of the fluorescent screen side end and the electron gun side side end.

According to the third solution of the self-converging deflection coil of the present invention, it includes at least a saddle-shaped horizontal deflection winding, a saddle-shaped vertical deflection winding arranged outside the aforementioned saddle-shaped horizontal deflection winding, and a magnetic field arranged outside the aforementioned saddle-shaped vertical deflection winding. The core is characterized in that at least a pair of positions with larger reluctance than the left and right are provided within a range of 35 degrees or more based on the horizontal axis of the magnetic core at one end of the fluorescent screen.

The third solution of the above-mentioned deflection coil of the present invention can be improved as follows:

At least one pair of cutouts shall be provided within a range of more than 35 degrees based on the horizontal axis of the magnetic core on one side of the fluorescent screen;

At least one pair of parts with reduced wall thickness shall be provided within a range of 35 degrees or more based on the horizontal axis of the magnetic core on one side of the fluorescent screen;

In the range of 35 degrees or more based on the horizontal axis of the magnetic core at one end of the fluorescent screen, at least a pair of parts made of a material with a magnetic permeability smaller than that of the left and right sides is provided.

According to the third scheme of the color picture tube equipped with self-converging deflection coils of the present invention, at least comprising, a vacuum tube made of a glass panel and a glass cone connected to the rear of the glass panel; an electron gun arranged at the rear of the aforementioned vacuum tube; The saddle-shaped horizontal deflection winding arranged on the outer periphery of the rear part of the aforementioned vacuum tube; the saddle-shaped vertical deflection winding arranged outside the aforementioned saddle-shaped horizontal deflection winding; the magnetic core arranged outside the aforementioned saddle-shaped vertical deflection winding is characterized in that, The magnetic core is provided with at least a pair of positions with larger reluctance than the left and right sides within the range above 35 degrees of the horizontal axis at one end of the fluorescent screen.

The third scheme of the above-mentioned color display tube of the present invention can be improved as follows respectively:

At least one pair of cutouts shall be provided within a range of more than 35 degrees based on the horizontal axis of the magnetic core on one side of the fluorescent screen;

At least one pair of parts with reduced wall thickness shall be provided within a range of 35 degrees or more based on the horizontal axis of the magnetic core at one side of the fluorescent screen;

In the range of 35 degrees or more based on the horizontal axis of the magnetic core at one end of the fluorescent screen, at least a pair of parts made of a material with a magnetic permeability smaller than that of the left and right sides is provided.

According to the fourth solution of the self-converging deflection coil of the present invention, it includes at least a saddle-shaped horizontal deflection winding, a saddle-shaped vertical deflection winding arranged outside the aforementioned saddle-shaped horizontal deflection winding, and a magnetic field arranged outside the aforementioned saddle-shaped vertical deflection winding. The core is characterized in that at least a pair of positions with smaller reluctance than the left and right are provided within a range of 35 degrees or more based on the horizontal axis of the magnetic core at one end of the fluorescent screen.

The fourth scheme of the above-mentioned deflection coil of the present invention can be improved as follows:

At least one pair of parts with increased wall thickness shall be provided within a range of 35 degrees or more based on the horizontal axis of the magnetic core on one side of the fluorescent screen;

In the range of 35 degrees or more based on the horizontal axis of the magnetic core at one end of the fluorescent screen, at least a pair of parts made of a material with a higher magnetic permeability than the left and right sides is provided.

According to the fourth scheme of the color picture tube equipped with self-converging deflection coils of the present invention, at least comprising, a vacuum tube made of a glass panel and a glass cone connected to the rear of the glass panel, an electron gun arranged at the rear of the aforementioned vacuum tube, The saddle-shaped horizontal deflection winding arranged on the outer periphery of the rear part of the aforementioned vacuum tube, the saddle-shaped vertical deflection winding arranged outside the aforementioned saddle-shaped horizontal deflection winding, and the magnetic core arranged outside the aforementioned saddle-shaped vertical deflection winding are characterized in that the aforementioned The magnetic core is provided with at least a pair of parts with smaller reluctance than the left and right parts within the range of more than 35 degrees of the horizontal axis at one end of the fluorescent screen as a reference.

The fourth scheme of the above-mentioned color display tube of the present invention can be improved as follows respectively:

At least one pair of parts with increased wall thickness shall be provided within a range of 35 degrees or more based on the horizontal axis of the magnetic core on one side of the fluorescent screen;

In the range of 35 degrees or more based on the horizontal axis of the magnetic core at one end of the fluorescent screen, at least a pair of parts made of a material with a higher magnetic permeability than the left and right sides is provided.

According to the first solution of the aforementioned deflection coil of the present invention, the self-converging deflection coil at least includes a saddle-type horizontal deflection winding, a saddle-type vertical deflection winding arranged outside the aforementioned saddle-type horizontal deflection winding, and a saddle-type vertical deflection winding arranged outside the aforementioned saddle-type vertical deflection winding. The magnetic core outside the winding has the characteristic that the reluctance of the above-mentioned magnetic core at the upper and lower central part of the one side of the fluorescent screen is larger than that of the left and right sides, so the magnetic field lines of the magnetic field generated by the horizontal deflection winding are difficult to pass through the magnetic core at the upper and lower central part of the fluorescent screen. Therefore, the pincushion-shaped magnetic field generated by the magnetic core and horizontal deflection winding on one side of the fluorescent screen is in a curved shape to avoid the upper and lower central parts of the magnetic core on one side of the fluorescent screen, which is stronger than the case of using a traditional magnetic core and horizontal deflection winding. . That's just that the pincushion magnetic field of the horizontal deflection winding on one side of the phosphor screen has become stronger. For this reason, the pincushion distortion of the grating at the upper and lower ends of the fluorescent screen can be compensated without providing a compensating magnet. As a result, the number of components is reduced, and the manufacturing cost is reduced, while there is no need to consider compensating for the dispersion of the magnetization of the magnet during the manufacturing process. By strengthening the correction of the barrel-shaped magnetic field generated by the vertical deflection winding, since the convergence misalignment on the phosphor screen can be compensated, only the deflection yoke itself can simultaneously compensate the pincushion distortion of the upper and lower ends of the phosphor screen and the convergence misalignment on the phosphor screen.

In the above-mentioned first scheme of the deflection coil of the present invention, if adopting the improvement that a slit is provided at the upper and lower central part of the fluorescent screen side end of the magnetic core, the reluctance of the magnetic core at the upper and lower central part of the fluorescent screen side end is larger than that of the left and right.

In the above-mentioned first scheme of the deflection coil of the present invention, if the wall thickness of the upper and lower central parts of the magnetic core at one side of the fluorescent screen is thinner than that of the left and right, the magnetic resistance of the magnetic core at the upper and lower central parts of the fluorescent screen is larger than that of the left and right sides. .

In the above-mentioned first scheme of the deflection coil of the present invention, if the improvement that the magnetic core is made of a material with a magnetic permeability smaller than that of the left and right sides at the upper and lower central parts of the fluorescent screen side end, the magnetic resistance of the magnetic core at the upper and lower central parts of the fluorescent screen side end Bigger than left and right.

According to the second solution of the aforementioned deflection coil of the present invention, the self-converging mode deflection coil at least includes a saddle-type horizontal deflection winding, a saddle-type vertical deflection winding arranged outside the aforementioned saddle-type horizontal deflection winding, and a saddle-type vertical deflection winding arranged outside the aforementioned saddle-type vertical deflection winding. The magnetic core on the outer side of the winding is characterized in that the reluctance of the magnetic core at the upper and lower central parts of the fluorescent screen side end and the electron gun side end is larger than that of the left and right sides, so as to reduce the emergence of the magnetic field generated from the horizontal deflection yoke coil. As a result, as in the case of the aforementioned first embodiment of the deflection yoke of the present invention, only the deflection yoke itself can simultaneously compensate the pincushion distortion of the grating on the upper and lower ends of the phosphor screen and the misconvergence on the phosphor screen. It is possible to reduce the leakage magnetic field on the phosphor screen side and the electron gun side.

According to the first scheme of the aforementioned color picture tube of the present invention, the color picture tube equipped with self-converging deflection coils at least includes a vacuum tube composed of a glass panel and a glass cone connected to the rear of the glass panel. The electron gun that is arranged on the part, the saddle-type horizontal deflection winding that is arranged on the outer periphery of the aforementioned vacuum tube, the saddle-type vertical deflection winding that is arranged on the outside of the aforementioned saddle-type horizontal deflection winding, the magnetic core that is arranged on the outside of the aforementioned saddle-type vertical deflection winding, utilize The magnetic resistance of the above-mentioned magnetic core at the upper and lower central parts of one side of the fluorescent screen is larger than that of the left and right parts, which can play the following role. That is, by using the aforementioned deflection yoke according to the first aspect of the present invention, the pincushion distortion of the upper and lower ends of the fluorescent screen and the misconvergence on the fluorescent screen can be compensated simultaneously as described above, so the image quality of the color picture tube is improved.

According to the second scheme of the aforementioned color picture tube of the present invention, the color picture tube equipped with self-converging deflection coils at least includes a vacuum tube composed of a glass panel and a glass cone connected to the rear of the glass panel, and is arranged on the aforementioned vacuum tube. The electron gun at the rear, the saddle-shaped horizontal deflection winding arranged on the outer periphery of the rear part of the aforementioned vacuum tube, the saddle-shaped vertical deflection winding arranged outside the aforementioned saddle-shaped horizontal deflection winding, the magnetic core arranged outside the aforementioned saddle-shaped vertical deflection winding, using The magnetic resistance of the above-mentioned magnetic core at the upper and lower central parts of the fluorescent screen side end and the electron gun side end is larger than that of the left and right sides, and the following effects can be produced. That is, by using the aforementioned deflection yoke of the second aspect of the present invention, as described above, only the deflection yoke itself can simultaneously compensate the pincushion distortion of the grating on the upper and lower ends of the phosphor screen and the misconvergence on the phosphor screen. And the reduction of the leakage magnetic field on the side of the electron gun, thus further improving the image quality of the color picture tube.

According to the third solution of the deflection coil of the present invention, the self-converging deflection coil at least includes a saddle-type horizontal deflection winding, a saddle-type vertical deflection winding arranged outside the aforementioned saddle-type horizontal deflection winding, and a saddle-type vertical deflection winding arranged outside the aforementioned saddle-type vertical deflection winding. The magnetic core uses the feature that at least a pair of positions with larger reluctance than the left and right are arranged within a range of 35 degrees or more based on the horizontal axis of the aforementioned magnetic core at one side of the fluorescent screen, so that it is difficult for the magnetic lines of the horizontal deflection magnetic field to pass through the magnetic core. The part where the resistance is larger than the left and right. Therefore, the pincushion magnetic field generated by the magnetic core and the horizontal deflection winding on the side of the fluorescent screen is curved to avoid the portion where the reluctance ratio is larger than the left and right, and the pincushion distortion of the horizontal deflection magnetic field increases. Therefore, compared with the case of using a conventional magnetic core and a horizontal deflection coil, the distribution of the magnetic field on the phosphor screen side generated by the horizontal deflection coil can be controlled. Therefore, the high-order grating distortion (gull-wing shape) at the upper and lower ends of the phosphor screen can be sufficiently reduced without changing the shape of the screen-side flange of the horizontal deflection winding. As a result, the winding wires at the flange portion on the screen side are not damaged when the windings of the windings are horizontally deflected. In addition, the gull-wing shape can be sufficiently reduced even without using the compensating magnet, so that the number of components can be reduced, and the manufacturing cost can be reduced. At the same time, it is not necessary to consider the magnetization dispersion of the compensating magnet in the manufacturing process.

In the aforementioned third solution of the deflection yoke of the present invention, if the improvement that at least one pair of cutouts is provided within a range of more than 35 degrees based on the horizontal axis of the magnetic core on one side of the fluorescent screen is adopted, since the magnetic field in the cutouts The resistance becomes large, so the magnetic field distribution on the fluorescent screen side generated by the horizontal deflection winding can be easily controlled.

In the aforementioned third solution of the deflection yoke of the present invention, if the improvement that at least a pair of wall-thinning parts are provided within a range of more than 35 degrees based on the horizontal axis of the magnetic core at one side of the phosphor screen is used, then the wall The magnetoresistance becomes larger at the thicker and thinner parts, so the magnetic field distribution on the phosphor screen side generated by the horizontal deflection coil can be easily controlled.

In the third solution of the aforementioned deflection coil of the present invention, if the horizontal axis of the magnetic core on one side of the fluorescent screen is used as a reference range of 35 degrees or more, at least one pair of material components with a magnetic permeability smaller than that of the left and right is provided. If it is improved, since the reluctance becomes large at the portion made of a material with low magnetic permeability, the distribution of the magnetic field on the phosphor screen side generated by the horizontal deflection winding can be easily controlled.

According to the third scheme of the aforementioned color picture tube of the present invention, the color picture tube equipped with self-converging deflection coils at least includes a vacuum tube formed by a glass panel and a glass cone connected to the rear of the glass panel, and is arranged on the aforementioned vacuum tube. The electron gun at the rear, the saddle-shaped horizontal deflection winding arranged on the outer periphery of the rear part of the aforementioned vacuum tube, the saddle-shaped vertical deflection winding arranged outside the aforementioned saddle-shaped horizontal deflection winding, the magnetic core arranged outside the aforementioned saddle-shaped vertical deflection winding, using Within the range of 35 degrees or more based on the horizontal axis of the magnetic core on one side of the fluorescent screen, at least a pair of positions with larger reluctance than the left and right are provided, which can produce the following effects. That is, due to the use of the above-mentioned deflection yoke of the third aspect of the present invention, the high-order raster distortion (gull-wing shape) on the upper and lower ends of the fluorescent screen can be sufficiently reduced as described above, so that the image quality of the color picture tube can be improved.

According to the aforementioned fourth solution of the deflection coil of the present invention, the self-converging deflection coil at least includes a saddle-shaped horizontal deflection winding, a saddle-shaped vertical deflection winding arranged outside the aforementioned saddle-shaped horizontal deflection winding, and a saddle-shaped vertical deflection winding arranged outside the aforementioned saddle-shaped vertical deflection winding. The magnetic core uses the feature that at least a pair of positions with smaller reluctance than the left and right are arranged within a range of 35 degrees or more based on the horizontal axis of the aforementioned magnetic core at one side of the fluorescent screen, so that the magnetic force lines of the horizontal deflection magnetic field can easily pass through the small reluctance parts. Therefore, the pincushion magnetic field generated by the magnetic core and the horizontal deflection coil on the phosphor screen side is bent in a shape toward a portion where the reluctance becomes smaller, so that the pincushion distortion of the horizontal deflection magnetic field is reduced. It is thereby possible to control the magnetic field distribution on the phosphor screen side of the horizontal deflection winding as compared with the case of using the conventional magnetic core and the horizontal deflection winding. Thereby, the high-order raster distortion (gull-wing shape) at the upper and lower ends of the phosphor screen can be sufficiently reduced without changing the shape of the screen-side flange of the horizontal deflection winding. As a result, the winding wires at the phosphor screen side flange portion are not damaged when the winding wires are horizontally deflected. In addition, the gull-wing shape can be sufficiently reduced even without compensating magnets, so that the number of components is reduced and the manufacturing cost is reduced, and at the same time, it is not necessary to consider the dispersion of the magnetization of the compensating magnets in the manufacturing process.

In the fourth scheme of the deflection yoke of the present invention, if the improvement of at least a pair of thickened parts is provided within the range of more than 35 degrees based on the horizontal axis of the magnetic core at one side of the phosphor screen, then due to the The magnetoresistance decreases in the thicker portion, so that the magnetic field distribution on the phosphor screen side generated by the horizontal deflection coil can be easily controlled.

In the fourth proposal of the above-mentioned deflection coil of the present invention, if the horizontal axis of the magnetic core on one side of the fluorescent screen is used as a range of more than 35 degrees, at least one pair of parts made of a material with a higher magnetic permeability than the left and right sides is provided. Since the reluctance becomes smaller at the portion made of a material with a high magnetic permeability, the magnetic field distribution on the fluorescent screen side generated by the horizontal deflection winding can be easily controlled.

Also, according to the fourth scheme of the aforementioned color picture tube of the present invention, the color picture tube equipped with self-converging deflection coils at least includes a vacuum tube composed of a glass panel and a glass cone connected to the rear of the glass panel. The electron gun at the rear of the aforementioned vacuum tube, the saddle-shaped horizontal deflection winding arranged on the outer periphery of the aforementioned vacuum tube rear, the saddle-shaped vertical deflection winding arranged outside the aforementioned saddle-shaped horizontal deflection winding, the magnetic core arranged outside the aforementioned saddle-shaped vertical deflection winding , utilizing the configuration of at least a pair of positions where the reluctance is smaller than the left and right parts within a range of more than 35 degrees with the horizontal axis of the aforementioned magnetic core at one end of the phosphor screen as a reference, the following effects can be produced. That is, the use of the aforementioned deflection yoke according to the fourth aspect of the present invention can sufficiently reduce the high-order raster distortion (gull-wing shape) at the upper and lower ends of the fluorescent screen as described above, so that the image quality of the color picture tube can be improved.

Fig. 1 is a side sectional view of the first embodiment (saddle-saddle type deflection yoke) of the deflection yoke of the present invention;

Fig. 2 is the magnetic core plane view of the first embodiment of the present invention;

Fig. 3 is a cross-sectional view near one side of the fluorescent screen showing the pincushion magnetic field shape produced by the conventional magnetic core and the horizontal deflection winding;

4 is a cross-sectional view near one side of the fluorescent screen showing the shape of the pincushion magnetic field generated by the magnetic core and the horizontal deflection winding according to the first embodiment of the present invention;

Fig. 5 shows the plan view of another example of the magnetic core of the first embodiment of the deflection coil of the present invention;

Fig. 6 is a cross-sectional view of the magnetic core of the second embodiment of the deflection yoke of the present invention near one end of the fluorescent screen;

Fig. 7 is a cross-sectional view of the magnetic core of the third embodiment of the deflection yoke of the present invention near one end of the fluorescent screen;

Fig. 8 is a magnetic core plan view of the fourth embodiment of the deflection yoke of the present invention;

Fig. 9 is an explanatory diagram of a leakage magnetic field of a deflection yoke using a conventional deflection yoke and a magnetic core according to a fourth embodiment of the present invention;

Fig. 10 is a plan view of another example of the magnetic core of the fourth embodiment of the deflection coil of the present invention;

Fig. 11 is a plan view of the fifth embodiment of the color picture tube of the present invention;

Fig. 12 is a plan view of the sixth embodiment (saddle-saddle type deflection yoke) of the deflection yoke of the present invention;

Fig. 13 is a magnetic core plan view of the sixth embodiment of the present invention;

Fig. 14 shows the sectional view near one side of the fluorescent screen in the pincushion magnetic field shape that the traditional magnetic core and the horizontal deflection winding produce;

Fig. 15 shows a cross-sectional view near one side of the phosphor screen in the shape of a pincushion magnetic field generated by the magnetic core and the horizontal deflection winding of the sixth embodiment of the present invention;

Fig. 16 is a plan view of another example of the magnetic core of the sixth embodiment of the deflection yoke of the present invention;

Fig. 17 is a cross-sectional view near one end of the fluorescent screen side of the magnetic core of the seventh embodiment of the deflection yoke of the present invention;

Fig. 18 is a cross-sectional view near one end of the fluorescent screen side of the magnetic core of the eighth embodiment of the deflection yoke of the present invention;

Fig. 19 is a cross-sectional view near one end of the fluorescent screen side of the magnetic core of the ninth embodiment of the deflection yoke of the present invention;

Fig. 20 is a cross-sectional view near one end of the fluorescent screen showing the pincushion-shaped magnetic field shape generated by the magnetic core and the horizontal deflection winding according to the ninth embodiment of the present invention;

Fig. 21 is a cross-sectional view near one side end of the fluorescent screen of the magnetic core of the tenth embodiment of the deflection yoke of the present invention;

Fig. 22 is a side sectional view of a conventional saddle-saddle deflection coil;

Fig. 23 is a plan view of a conventional saddle-saddle deflection coil;

Fig. 24 is a diagram illustrating the phenomenon of positive anisotropic astigmatism.

The present invention is further specifically described below by way of examples.

Example 1

Fig. 1 is a side sectional view of the first embodiment of the deflection line diagram (saddle-saddle deflection coil) of the present invention; Fig. 2 is a plan view of the magnetic core of the first embodiment of the present invention. As shown in Figure 1, the deflection coil consists of a saddle-shaped horizontal deflection winding 1, a saddle-shaped vertical deflection group 2 arranged on the outside of the horizontal deflection winding 1, and a high-permeability magnetic core arranged on the outside of the vertical deflection winding 2 3 composition.

As shown in Figures 1 and 2, a notch 7 is provided at the upper and lower central parts of the magnetic swallow 3 at one side of the fluorescent screen. The notch was formed into a semicircular shape with a radius of 28 mm.

Here, Fig. 3 shows the traditional magnetic core 3' and the shape of the pincushion magnetic field generated by the horizontal deflection winding 1; Fig. 4 shows the magnetic core 3 and the horizontal deflection winding 1 with a cutout 7 in the upper and lower central parts of one end of the fluorescent screen The shape of the resulting pincushion magnetic field. Figures 3 and 4 are views viewed from one side of the fluorescent screen. Since the notch 7 is provided at the upper and lower central portion of one end of the fluorescent screen, the magnetic resistance of the notch 7 becomes large, so that the lines of force of the horizontal deflection magnetic field 8 are difficult to pass through. Therefore, as shown in Figure 4, the pincushion-shaped magnetic field (horizontal deflection magnetic field 8) on one side of the fluorescent screen produced by the magnetic core 3 and the horizontal deflection winding 1 is in a curved shape avoiding the notch 7, which is better than using the conventional magnetic core 3'. And the case of the horizontal deflection winding (Figure 3) is much stronger. That is, only the pincushion magnetic field of the horizontal deflection winding 1 becomes stronger on the fluorescent screen side. Therefore, the pincushion distortion of the grating at the upper and lower ends of the fluorescent screen can be compensated without setting a compensation magnet. As a result, the number of parts is reduced, and the manufacturing cost is reduced, and at the same time, it is not necessary to consider the dispersion of the magnetization of the compensation magnet in the manufacturing process. In particular, when the notch 7 is formed in a semicircular shape with a radius of 28mm as described above, the raster pincushion distortion at the upper and lower ends of the color television receiver screen is reduced from 4% to about 0%. And because the barrel-shaped magnetic field generated by the vertical deflection winding 2 is enhanced, the misconvergence on the fluorescent surface can be compensated, so only the deflection yoke itself can simultaneously compensate the pincushion distortion of the upper and lower ends of the fluorescent screen and the misconvergence on the fluorescent surface.

Also in this embodiment, although the notch portion 7 is formed in a semicircular shape with a radius of 28 mm in this embodiment, it is not necessarily limited to this value, and its radius value is optional. Also, the shape of the notch is not limited to a semicircle, and the same effect can be obtained in any shape. Especially as shown in Figure 5, when the shape of the notch is rectangular, when the total length of the magnetic core is L1, the horizontal maximum size of the opening of the magnetic core on one side of the fluorescent screen is L2, and the lengths of the two sides of the rectangle are a and b, then it is ideal. The situation is:

0<a/L ₁ ≤0.5

0<b/L ₂ ≤0.7

Furthermore, in this embodiment, although the notch 7 is provided as a measure to increase the magnetic resistance, the notch 7 is not necessarily provided. Considering the magnetic force lines in the magnetic core on one side of the fluorescent screen, as long as the reluctance of the upper and lower central parts of the magnetic core at the one side of the fluorescent screen is larger than that of the left and right, it will hardly affect the distribution of the vertical deflection magnetic field, but only strengthen the horizontal deflection magnetic field. Other examples are shown in the second and third embodiments described below.

Example 2

Fig. 6 is a sectional view of the magnetic core of the second embodiment of the deflection yoke of the present invention near one end of the phosphor screen. As shown in FIG. 6, the wall thickness of the upper and lower central portions 9 of the magnetic core 3 at one side of the fluorescent screen is thinner than that of the left and right sides. The rest of the configuration is the same as that of the above-mentioned first embodiment, and the description thereof is omitted (refer to FIG. 1). If only the wall thickness of the upper and lower central parts 9 at one end of the fluorescent screen is thinner than the left and right ones, the magnetic resistance is large at the thin wall parts, so the magnetic force lines of the horizontal deflection magnetic field are difficult to pass through. As a result, the same effect as the case where the notch portion 7 is provided in the first embodiment described above can be obtained.

Example 3

Fig. 7 is a cross-sectional view of the magnetic core near one end of the fluorescent screen in the third embodiment of the deflection yoke of the present invention. As shown in FIG. 7, the upper and lower central portions 10 of the magnetic core 3 at one side of the fluorescent screen are made of a material having a lower magnetic permeability than the left and right sides. The rest of the structure is the same as that of the above-mentioned first embodiment, and the description thereof is omitted (see FIG. 1). If a ferrite core (Mg-Zn) is used as the magnetic core 3, if only the upper and lower central parts 10 at one end of the fluorescent screen are formed by changing the mixing ratio of a material with a low magnetic permeability, the structure of this embodiment can be realized. That is, H4L (manufactured by TDK, magnetic permeability μ ₁ =500) is used as a whole of the magnetic core 3, and H4M (manufactured by TDK, magnetic permeability μ 2 =320) or H4H (manufactured by TDK, magnetic permeability μ ₂ =320) or H4H (manufactured by TDK, magnetic permeability μ 2 =320) is used only for the upper and lower central portion 10 at one end of the fluorescent screen. Magnetic rate μ ₃ =400). In this way, if only the upper and lower central portions 10 of one side of the fluorescent screen are made of a material with a lower magnetic permeability than the left and right sides, the magnetic resistance of the lower magnetic permeability portion is large, so the magnetic force lines of the horizontal deflection magnetic field are difficult to pass through. As a result, the same effect as when the notch 7 is provided in the first embodiment described above can be obtained.

Example 4

Fig. 8 is a plan view of a magnetic core of a fourth embodiment of the deflection yoke of the present invention. As shown in FIG. 8, the magnetic core 3 is provided with notches 7 and 15 at the upper and lower central portions of the fluorescent screen side end and the electron gun side end. The rest of the configuration is the same as that of the above-mentioned first embodiment, and the description thereof is omitted (see FIG. 1).

Fig. 9 shows the magnetic field strength on the central axis of a conventional deflection yoke and a deflection yoke using the magnetic core 3 of this embodiment. In FIG. 9, curve 16 is the case of the deflection yoke using the magnetic core 3 of this embodiment; curve 17 is the case of the conventional deflection yoke. Comparing the two, although the peaks of the curves are approximately the same curve, the value of the deflection yoke using the magnetic core 3 of this embodiment is lower than that of the conventional deflection yoke on the phosphor screen side and the electron gun side, which shows that The leakage magnetic field on the fluorescent screen side and the electron gun side is reduced. The reason is that the magnetic core 3 is provided with cutouts 7 and 15 at the upper and lower central parts of the fluorescent screen side end and the electron gun side end respectively. The resistance becomes large, so that the influence from the coil that generates the magnetic field from the horizontal deflection winding 1 is weakened. In other words, when semicircular cutouts 7 and 15 with radii of 28 mm and 10 mm are respectively provided at the upper and lower central parts of one side of the fluorescent screen and one side of the electron gun, the leakage magnetic field is 35% lower than that of the conventional structure.

If the deflection yoke is constituted as in the present embodiment, as described in the first embodiment above, only the deflection yoke itself can simultaneously compensate the pincushion distortion of the grating on the upper and lower ends of the fluorescent screen and the misconvergence on the fluorescent screen, etc., simultaneously. Reduction of the leakage magnetic field on the phosphor screen side and the electron gun side.

Also, in the present embodiment, although the notch 7 is formed in a semicircle with a radius of 28 mm, and the notch 15 is formed with a semicircle with a radius of 10 mm, they are not limited to this value, and may have any radius. In addition, the shape of the notch is not limited to a semicircle, and the same effect can be obtained even if it is an arbitrary shape. Especially as shown in Fig. 10, when the shape of the notch is rectangular, the ideal size relationship is, when the total length of the magnetic core is L ₁ , the maximum horizontal dimension of the opening of the electron gun side of the magnetic core is L ₂ , and the length of both sides of the rectangle is a, b,

0<a/L ₁ ≤0.2

0<b/L ₂ ≤0.35 The shape of the notch 7 is a rectangle, which has been explained in the above-mentioned first embodiment and will not be repeated here.

In this embodiment, as a measure to reduce the leakage magnetic field on the phosphor screen side and the electron gun side, although the notches 7, 15 are provided, the notches 7, 15 are not unique, as long as the magnetic core 3 is placed on the phosphor screen It is sufficient that the reluctance of one end and the upper and lower central portions of the one end of the electron gun is larger than that of the left and right. Thereby, like above-mentioned second embodiment, both can make magnetic core 3 in fluorescent screen one side end and electron gun one side end, the upper and lower central part wall thickness is done thinner than left and right sides, also can be like above-mentioned 3rd embodiment, use magnetic permeability ratio The left and right small materials only constitute the upper and lower central parts of the magnetic core 3 at one side of the fluorescent screen and one side of the electron gun.

Example 5

Fig. 11 is a plan view of a fifth embodiment of the color picture tube of the present invention. In FIG. 11 , the vacuum tube 11 is composed of a glass panel 12 and a glass cone 13 connected to the rear of the glass panel 12 , and an electron gun 14 is arranged at the rear of the glass cone 13 . And the deflection yoke of self-convergence mode is contained on the outer periphery of glass cone 13 rear parts, and above-mentioned deflection coil is made up of the horizontal deflection winding 1 that is wound into saddle shape, the saddle vertical deflection winding 2 that is arranged on the outside of horizontal deflection winding 1 and is arranged on the saddle. Type vertical deflection winding 2 outer high permeability magnetic core 3 is composed. Furthermore, the magnetic core 3 is provided with a notch 7 at the upper and lower central portions of one end of the fluorescent screen (see FIGS. 1 and 2 ). The notch 7 is formed in a semicircle with a radius of 28 mm. That is, in the color picture tube of this embodiment, the deflection yoke having the structure shown in the above-mentioned first embodiment is used as the deflection yoke. Like this, by using the deflection yoke of the structure shown in the above-mentioned 1st embodiment, since can compensate the pincushion distortion of upper and lower end rasters on the fluorescent screen surface and the misconvergence on the fluorescent screen surface at the same time as mentioned above, so the performance of the color picture tube is improved. image quality.

In this embodiment, although the case of using the deflection yoke having the structure shown in the above-mentioned first embodiment is described as an example, it is not limited to this structure. Considering the magnetic force lines in the magnetic core on the phosphor screen side, a deflection yoke having a reluctance larger in the upper and lower central parts of the magnetic core at one end of the phosphor screen than the left and right sides can be used to enhance only the horizontal deflection magnetic field without substantially affecting the vertical deflection magnetic field. That is, as the deflection yoke, for example, the deflection yoke having the structure shown in the above-mentioned second and third embodiments can be used. And if the deflection coil with the structure shown in the above-mentioned fourth embodiment is used, the leakage magnetic field on the side of the fluorescent screen and the side of the electron gun can be reduced, and unnecessary high radiation that has adverse effects on the human body can be reduced, forming a beneficial to human body. good environment.

Example 6

Fig. 12 is a plan view of the sixth embodiment (saddle-saddle type deflection yoke) of the deflection yoke of the present invention; Fig. 13 is a plan view of the magnetic core of the sixth embodiment of the present invention. As shown in Figure 12, the deflection yoke consists of a saddle-shaped horizontal deflection winding 1, a saddle-shaped vertical deflection winding 2 outside the horizontal deflection winding 1, and a high permeability magnetic core 3 outside the vertical deflection winding 2.

As shown in FIGS. 12 and 13 , a pair of cutouts 18 are provided within a range of 35 degrees or more based on the horizontal axis of the magnetic core 3 at one end of the fluorescent screen (see FIG. 15 ). The notch 18 is formed in a semicircle with a radius of 10 mm.

Here, FIG. 14 shows the shape of the pincushion magnetic field generated by the usual magnetic core 3' and the horizontal deflection winding 1. As shown in FIG. 15 shows the shape of the pincushion magnetic field generated by the magnetic core 3 and the horizontal deflection winding 1 provided with a pair of notches 18 within a range of 35 degrees or more based on the horizontal axis at one end of the fluorescent screen. 14 and 15 are views seen from the phosphor screen side. By providing a pair of cutouts 18 within a range of 35 degrees or more from the horizontal axis at one end of the fluorescent screen, the magnetic resistance of the cutouts 18 increases so that it is difficult for the lines of force of the horizontal deflection magnetic field 19 to pass through. Therefore, the screen-side pincushion magnetic field generated by the magnetic core 3 and the horizontal deflection coil 1 has a curved shape avoiding the notch 18 as shown in FIG. 15, and the pincushion distortion of the horizontal deflection magnetic field 19 increases. Therefore, it is possible to control the distribution of the magnetic screen side magnetic field generated by the horizontal deflection coil 1 compared to the case of using the usual magnetic core 3' and the horizontal deflection coil 1 (FIG. 14). Thus, without changing the shape of the screen-side flange of the horizontal deflection winding 1, it is possible to sufficiently reduce high-order grating distortion (gull-wing shape) at the upper and lower ends of the screen. As a result, the winding wire material at the flange portion on the phosphor screen side is not damaged when the horizontal deflection coil 1 is wound. And since the gull-wing shape can be fully reduced without the compensation magnet, the number of parts is reduced, the manufacturing cost is reduced, and the dispersion of the magnetization of the compensation magnet does not need to be considered in the manufacturing process. In particular, as described above, when the notch 18 is formed into a semicircle with a radius of 10 mm, the gull-wing shape on the screen of the color television receiver is reduced from 1% to approximately 0%.

In this embodiment, although a pair of cutouts 18 are provided within a range of 35 degrees or more based on the horizontal axis of one end of the fluorescent screen, it is not limited to one pair. If more than one pair of notches 18 are provided, the distribution of the magnetic screen side magnetic field generated by the horizontal deflection winding 1 can be further finely controlled.

Also, in this embodiment, although the notch 18 is formed as a semicircle with a radius of 10 mm, this numerical value is not necessarily limited, and the radius may be any numerical value. Moreover, the shape of the cutout does not have to be limited to a semicircle, and the same effect can be obtained in any shape. Especially as shown in Figure 16, when the shape of the cutout is rectangular, the ideal relationship of its size is that when the total length of the magnetic core is L ₁ , the horizontal maximum size of the opening of the magnetic core on one side of the fluorescent screen is 2L ₂ ; the side length of the rectangle is When they are a and b respectively, then:

0<a/L ₁ ≤0.5

0<b/L ₂ ≤0.5

In this embodiment, the notch 18 is provided as a measure to increase the magnetic resistance, but the notch 18 is not necessarily provided. Considering the magnetic force lines in the magnetic core on the side of the fluorescent screen, in order to increase the pincushion distortion of the horizontal deflection magnetic field Within the range of more than 35 degrees based on the horizontal axis of the magnetic core at one side of the fluorescent screen, at least one pair of positions with larger reluctance than the left and right should be set. Other examples are shown in Examples 7 and 8 below.

Example 7

Fig. 17 is a cross-sectional view of the magnetic core of the seventh embodiment of the deflection yoke of the present invention near one end of the fluorescent screen. In FIG. 17, the magnetic core 3 is provided with at least a pair of thin-walled portions 20 within a range of more than 35 degrees with respect to the horizontal axis at one end of the fluorescent screen. The rest of the structure is the same as that of the above-mentioned sixth embodiment, and the description thereof is omitted (see FIG. 12). In the range of more than 35 degrees based on the horizontal axis of one side of the fluorescent screen, by means of at least one pair of thinned parts 20, the magnetic resistance increases at the thinned parts 20, so the horizontal deflection magnetic field 19 magnetic field lines are difficult to pass through. As a result, the same effect as when the notch 18 is provided in the sixth embodiment described above can be obtained.

Example 8

Fig. 18 is a cross-sectional view of the magnetic core of the eighth embodiment of the deflection yoke of the present invention, near one end of the fluorescent screen. As shown in FIG. 18, the magnetic core 3 is provided with a pair of parts 21 made of a material with a lower magnetic permeability than the left and right sides within a range of 35 degrees or more based on the horizontal axis at one end of the fluorescent screen. The rest of the configuration is the same as that of the sixth embodiment described above, and its description is omitted (see FIG. 12). The position 21 made of a material with a magnetic permeability smaller than that of the left and right sides is provided within the range of 35 degrees or more based on the horizontal axis of one end of the fluorescent screen. Since the magnetic resistance at this position 21 becomes large, the magnetic force lines of the horizontal deflection magnetic field 19 are difficult to pass through. . As a result, the same effect as in the case of providing the notch portion 18 in the sixth embodiment described above is obtained.

Example 9

Fig. 19 is a cross-sectional view of the magnetic core of the ninth embodiment of the deflection yoke of the present invention near one end of the fluorescent screen. As shown in FIG. 19 , a pair of thickened portions 22 are provided within a range of more than 35 degrees based on the horizontal axis of the magnetic core 3 at one end of the fluorescent screen. The thickness portion 22 is formed into a semicircle with a radius of 10 mm. The rest of the structure is the same as that of the sixth embodiment described above, and its description is omitted (see FIG. 12).

Here, FIG. 20 shows the shape of the pincushion-shaped magnetic field on one side of the fluorescent screen generated by the magnetic core 3 and the horizontal deflection winding 1, and the magnetic core 3 is set on the magnetic core 3 within a range of 35 degrees or more based on the horizontal axis of one side of the fluorescent screen. The part 22 where the wall thickness is thickened. Fig. 20 is a view from the phosphor screen side. In the range of more than 35 degrees with the horizontal axis of one side of the fluorescent screen as a reference, by setting a pair of thickened parts 22, since the magnetic resistance becomes smaller in the thickened parts 22, the magnetic force lines of the horizontal deflection magnetic field 19 are easy to pass. Therefore, as shown in FIG. 20, the pincushion magnetic field generated by the magnetic core 3 and the horizontal deflection coil 1 on the phosphor screen side is bent toward the thick portion 22, and the pincushion distortion of the horizontal deflection magnetic field 19 is reduced. Thus, compared with the case of using the conventional magnetic core 3' and the horizontal deflection coil 1 (Fig. 14), the magnetic field distribution of the horizontal deflection coil on the phosphor screen side can be controlled. Thus, even if the shape of the flange portion of the horizontal deflection coil 1 on the phosphor screen side remains unchanged, the high-order grating distortion (gull-wing shape) at the upper and lower ends of the phosphor screen can be sufficiently reduced. As a result, the winding wire material at the flange portion on the screen side is not damaged when the horizontal deflection coil 1 is wound. In addition, since the gull wings are sufficiently lightened, the number of parts is reduced and the cost is reduced, even though the compensating magnet is not used, while there is no need to consider the dispersion of the magnetization of the compensating magnet in the manufacturing process. In particular, when the wall thickness portion 22 is formed into a semicircle with a radius of 10 mm as described above, the gull-wing shape on the screen of the television receiver is reduced from 1% to approximately 0%.

Furthermore, in the present embodiment, although the thickness portion 22 is formed as a semicircle with a radius of 10 mm, it is not necessary to be limited to this value, and any radius value may be used. Moreover, the shape of the wall thickness part need not be limited to a semicircle, for example, any shape such as a rectangle can also be sampled.

And in the present embodiment, although the wall thickness portion 22 is provided as a measure to reduce the reluctance, the wall thickness portion 22 does not necessarily need to be provided. To reduce the pincushion distortion of the magnetic field, it is only necessary to set at least a pair of positions with smaller reluctance ratios than the left and right sides within a range of more than 35 degrees based on the horizontal axis of the magnetic core at one side of the fluorescent screen. Other examples are shown in the tenth embodiment described below.

Example 10

Fig. 21 is a cross-sectional view of the magnetic core of the tenth embodiment of the deflection yoke of the present invention in the vicinity of one end of the fluorescent screen. As shown in FIG. 21, the magnetic core 3 is provided with a pair of parts 23 made of a material with a higher magnetic permeability than the left and right sides within a range of more than 35 degrees based on the horizontal axis of one end of the fluorescent screen. The other configurations are the same as those of the sixth embodiment described above, and their descriptions are omitted (see FIG. 12). In the range of more than 35 degrees based on the horizontal axis of one side of the fluorescent screen, by setting a pair of parts 23 made of a material with a larger magnetic permeability than the left and right, since the reluctance becomes smaller in this part 23, the horizontal deflection magnetic field 19 The magnetic field lines are easy to pass through. As a result, the effect obtained is the same as when the wall thickness portion 22 is provided in the ninth embodiment described above.

Example 11

The plan view of the color picture tube described in this embodiment is the same as that of Fig. 11 used in the fifth embodiment described above, so this embodiment will be described using Fig. 11 . That is, as shown in FIG. 11 , the vacuum tube 11 is composed of a glass panel 12 and a glass cone 13 connected to the rear of the glass panel 12 , and the electron gun 14 is arranged at the rear of the glass cone 13 . And the deflection yoke of self-convergence mode is contained on the outer periphery of glass cone 13 rear parts, and above-mentioned deflection coil is made up of the horizontal deflection winding 1 that is wound into saddle shape, the saddle vertical deflection winding 2 that is arranged at the horizontal deflection winding 1 outside and is arranged on the saddle. Type vertical deflection winding 2 outer high permeability magnetic core 3 is composed. In addition, the core 3 is provided with a pair of notches 18 within a range of 35 degrees or more relative to the horizontal axis at one end of the fluorescent screen (see FIGS. 12 , 13 , and 15 ). The notch is formed in a semicircle with a radius of 10 mm. That is, in the color picture tube of this embodiment, the deflection yoke shown in the sixth embodiment above is used as the deflection yoke. By using the deflection yoke of the structure shown in the sixth embodiment, the high-order raster distortion (gull-wing) at the upper and lower ends of the phosphor screen is sufficiently reduced, thereby improving the image quality of the color picture tube.

Also in this embodiment, although the case of using the deflection yoke of the configuration shown in the above-mentioned sixth embodiment is exemplified, it is not necessarily limited to this configuration. Such a deflection coil can also be used. In consideration of the magnetic field lines in the magnetic core on the fluorescent screen side, in order to increase the pincushion distortion of the horizontal deflection magnetic field, the horizontal axis of the magnetic core at the side of the fluorescent screen is used as a reference. The range of 35 degrees or more Inside, set at least a pair of parts with larger reluctance ratio than the left and right, or in order to reduce the pincushion distortion of the horizontal deflection magnetic field, set at least A pair of parts where the reluctance is smaller than that of the left and right. That is, as the deflection yoke, for example, the deflection yoke having the structure shown in the above seventh to tenth embodiments may be used.

Claims (30)

1. auto-convergence formula deflecting coil, at least comprise, saddle type horizontal deflection winding, be arranged on the saddle type vertical deflection winding in the described saddle type horizontal deflection winding outside and be arranged on the magnetic core in the described saddle type vertical deflection winding outside, it is characterized in that described magnetic core big about the magneto resistive ratio of the central portion up and down of phosphor screen one side.

2. deflecting coil as claimed in claim 1 is characterized in that, at the central portion up and down of phosphor screen one side notch is set at magnetic core.

3. deflecting coil as claimed in claim 1 is characterized in that, magnetic core approaching about the wall ratio of the central portion up and down of phosphor screen one side.

4. deflecting coil as claimed in claim 1 is characterized in that, magnetic core little material about the central portion up and down of phosphor screen one side compares with permeability constitutes.

5. deflection line graph as claimed in claim 1 is characterized in that, described magnetic core big about the magneto resistive ratio of the central portion up and down of electron gun one side.

6. deflecting coil as claimed in claim 5 is characterized in that, at the central portion up and down of phosphor screen one side and electron gun one side notch is set at magnetic core.

7. deflecting coil as claimed in claim 5 is characterized in that, magnetic core approaching about the wall ratio of central portion up and down of phosphor screen one side and electron gun one side.

8. deflecting coil as claimed in claim 5 is characterized in that, magnetic core little material about the central portion up and down of phosphor screen one side and electron gun one side compares with permeability constitutes.

9. chromoscope that auto-convergence formula deflecting coil is housed, at least comprise, by face glass and connect the vacuum tube that the glass neck at described face glass rear portion is formed, be arranged on the electron gun at described vacuum tube rear portion, be arranged on the saddle type horizontal deflection winding of described vacuum tube rear portion periphery, be arranged on the saddle type vertical deflection winding in the described saddle type horizontal deflection winding outside, be arranged on the magnetic core in the described saddle type vertical deflection winding outside, it is characterized in that described magnetic core big about the magneto resistive ratio of the central portion up and down of phosphor screen one side.

10. chromoscope as claimed in claim 9 is characterized in that, at the central portion up and down of phosphor screen one side notch is set at magnetic core.

11. chromoscope as claimed in claim 9 is characterized in that, magnetic core approaching about the wall ratio of the central portion up and down of phosphor screen one side.

12. chromoscope as claimed in claim 9 is characterized in that, magnetic core little material about the central portion up and down of phosphor screen one side compares with permeability constitutes.

13. chromoscope as claimed in claim 9 is characterized in that, described magnetic core big about the magneto resistive ratio of the central portion up and down of electron gun one side.

14. chromoscope as claimed in claim 13 is characterized in that, at the central portion up and down of phosphor screen one side and electron gun one side notch is set at magnetic core.

15. chromoscope as claimed in claim 13 is characterized in that, magnetic core approaching about the wall ratio of the central portion up and down of phosphor screen one side and electron gun one side.

16. chromoscope as claimed in claim 13 is characterized in that, magnetic core little material about the central portion up and down of phosphor screen one side and electron gun one side compares with permeability constitutes.

17. auto-convergence formula deflecting coil, at least comprise, saddle type horizontal deflection winding, be arranged on the saddle type vertical deflection winding in the described saddle type horizontal deflection winding outside, with the magnetic core that is arranged on the described saddle type vertical deflection winding outside, it is characterized in that, in trunnion axis the 35 degree above scope as benchmark of described magnetic core, position big about a pair of magneto resistive ratio is set at least at phosphor screen one side.

18. deflecting coil as claimed in claim 17 is characterized in that, in trunnion axis the 35 degree above scope as benchmark of magnetic core at phosphor screen one side, pair of notches portion is set at least.

19. deflecting coil as claimed in claim 17 is characterized in that, in trunnion axis the 35 degree above scope as benchmark of magnetic core at phosphor screen one side, the position of a pair of wall thickness reduction is set at least.

20. deflecting coil as claimed in claim 17 is characterized in that, in trunnion axis the 35 degree above scope as benchmark of magnetic core at phosphor screen one side, a pair of position that constitutes with material little about the permeability ratio is set at least.

21. chromoscope that auto-convergence formula deflecting coil is housed, at least comprise, by face glass and connect the vacuum tube that the glass neck at described face glass rear portion is formed, be arranged on the electron gun at described vacuum tube rear portion, be arranged on the saddle type horizontal deflection winding of described vacuum tube rear portion periphery, be arranged on the saddle type vertical deflection winding in the described saddle type horizontal deflection winding outside, be arranged on the magnetic core in the described saddle type vertical deflection winding outside, it is characterized in that, in with trunnion axis the 35 degree above scope as benchmark of described magnetic core, position big about a pair of magneto resistive ratio is set at least at phosphor screen one side.

22. chromoscope as claimed in claim 21 is characterized in that, in trunnion axis the 35 degree above scope as benchmark of magnetic core at phosphor screen one side, pair of notches portion is set at least.

23. chromoscope as claimed in claim 21 is characterized in that, in trunnion axis the 35 degree above scope as benchmark of magnetic core at phosphor screen one side, the position that a pair of wall thickness reduces is set at least.

24. chromoscope as claimed in claim 21 is characterized in that, in trunnion axis the 35 degree above scope as benchmark of magnetic core at phosphor screen one side, a pair of position that constitutes with material little about the permeability ratio is set at least.

25. auto-convergence formula deflecting coil, at least comprise, saddle type horizontal deflection winding, be arranged on the saddle type vertical deflection institute winding in the described saddle type horizontal deflection winding outside, with the magnetic core that is arranged on the described saddle type vertical deflection winding outside, it is characterized in that, in trunnion axis the 35 degree above scope as benchmark of described magnetic core, position little about a pair of magneto resistive ratio is set at least at phosphor screen one side.

26. deflecting coil as claimed in claim 25 is characterized in that, in trunnion axis the 35 degree above scope as benchmark of magnetic core at phosphor screen one side, the position that a pair of wall thickness thickens is set at least.

27. deflecting coil as claimed in claim 25 is characterized in that, in trunnion axis the 35 degree above scope as benchmark of magnetic core at phosphor screen one side, a pair of position that constitutes with material big about the permeability ratio is set at least.

28. chromoscope that auto-convergence formula deflecting coil is housed, at least comprise, by face glass and connect the vacuum tube that the glass neck at described face glass rear portion is formed, be arranged on the electron gun at described vacuum tube rear portion, be arranged on the saddle type horizontal deflection winding of described vacuum visitor rear portion periphery, be arranged on the saddle type vertical deflection winding in the described saddle type horizontal deflection winding outside, be arranged on the magnetic core in the described saddle type vertical deflection winding outside, it is characterized in that, in with trunnion axis the 35 degree above scope as benchmark of described magnetic core, position little about a pair of magneto resistive ratio is set at least at phosphor screen one side.

29. chromoscope as claimed in claim 28 is characterized in that, in trunnion axis the 35 degree above scope as benchmark of magnetic core at phosphor screen one side, the position that a pair of wall thickness thickens is set at least.

30. chromoscope as claimed in claim 28 is characterized in that, in trunnion axis the 35 degree above scope as benchmark of magnetic core at phosphor screen one side, a pair of position that constitutes with material big about the permeability ratio is set at least.

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