JP2000173498A - Deflection yoke and magnetic substance core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve deflecting efficiency by preventing generation of an extra space in a magnetic substance core as much as possible. SOLUTION: A cross section of a magnetic substance core 1A has shape provided with a pair of straight-line sides 1h opposed to each other vertically, and straight-line sides 1v opposed to each other horizontally, and projection parts 1t in places having no effective wire winding parts of a vertical deflecting coils 6. In the vertical deflecting coils 6 and a coil separator 7, the straight-line sides 6h, 7h are partially formed along the vertical straight-line sides 1h in the magnetic substance core 1A. Accordingly, as a space is not generated in the magnetic substance core 1A, deflecting efficiency is improved. The magnetic substance core 1A has such a shape that a uniform magnetic field is apt to be formed, and whereby there is advantage for such a characteristic as convergence, distortion and focus and the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a deflection yoke and a magnetic core, and more particularly, to a deflection yoke and a magnetic core capable of improving deflection efficiency.

[0002]

2. Description of the Related Art FIG. 5 is a sectional view showing an example of a conventional deflection yoke. The deflection yoke 500 includes a coil separator 57, a pair of horizontal deflection coils 5 disposed inside the coil separator 57, and the coil separator 5.
7 and a pair of vertical deflection coils 56 disposed outside the vertical deflection coil 56, and a magnetic core 51 disposed outside the vertical deflection coil 56.

[0003] The coil separator 57 is formed as an integral or a combination of a plurality of divided members, and has a ring-shaped trumpet shape having an opening with a small area and an opening with a large area. The magnetic core 51 is integrally or in combination with a plurality of divided members, and has a trumpet shape having a small-area opening and a large-area opening having an annular cross section.

[0004]

The conventional deflection yoke device 500 has the following problems. (1) There is a pair of vertical deflection coils 56 at the top and bottom, not at the left and right. For this reason, a rounded portion Wv is formed inside the left and right sides of the magnetic core 51 having the annular cross section. However, if there is a gap such as the mud portion Wv inside the magnetic core 51, there is a problem that the deflection efficiency is reduced. (2) There is a pair of horizontal deflection coils 5 on the left and right, not on the top and bottom. Therefore, the coil separator 57 having an annular cross section is used.
Is formed inside the upper and lower sides of the head. But,
If there is a gap such as the mound portion Wh inside the magnetic core 51, there is a problem that the deflection efficiency is reduced. (3) The vertical deflection coil 56 has a portion having no winding (for example, a rib portion L). However, a portion where there is no winding is a gap, and if such a gap exists inside the magnetic core 51, there is a problem that the deflection efficiency is reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a deflection yoke and a magnetic core having improved deflection efficiency by minimizing the formation of extra voids inside the magnetic core.

[0006]

According to a first aspect of the present invention, a pair of horizontal deflection coils are provided inside a coil separator, and a pair of vertical deflection coils are provided outside a coil separator. A deflection yoke in which a magnetic core is disposed outside a vertical deflection coil, wherein the magnetic core has a trumpet shape having a small-area opening and a large-area opening, and a cross-section of an intermediate portion between the two openings. Provided is a deflection yoke characterized in that the inner shape (when there is unevenness, the shape in which unevenness is leveled) is a shape including at least one pair of opposing straight sides or loosely curved arc-shaped sides. In the above configuration, the loosely curved arc-shaped side refers to an arc-shaped side having a radius of curvature larger than twice the radius of a circle having an area equal to the opening area in the cross section. In the deflection yoke according to the first aspect, the shape of the magnetic core is not an annular cross section, but a shape including at least one pair of opposed straight sides or a slightly curved arc side. If such opposing sides are provided on the left and right so as to crush the left and right mud portions Wv as shown in FIG. 5, no void is formed in the left and right inner sides of the magnetic core, so that the deflection efficiency is improved. I can do it. Also, if the coil separator and the vertical deflection coil are deformed so as to crush the upper and lower mud portions Wh as shown in FIG. , The deflection efficiency can be improved. Furthermore, if the opposing sides are provided on the left and right and up and down, no extra air gap is generated inside the left and right and up and down of the magnetic core, so that the deflection efficiency can be further improved.

The invention according to the first aspect relates to a deflection yoke in which the horizontal deflection coil and the vertical deflection coil are saddle type coils, and a deflection yoke in which the horizontal deflection coil is a saddle type coil and the vertical deflection coil is a toroidal type coil. It is effective for any of them.

According to a second aspect of the present invention, in the deflection yoke according to the first aspect, a concave portion for accommodating an effective length winding portion of the vertical deflection coil is provided on an inner surface of the magnetic core. Is provided. In the deflection yoke according to the second aspect, a concave portion is provided on the inner surface of the magnetic core, and the effective length winding portion of the vertical deflection coil is accommodated in the concave portion. As a result, the portion of the vertical deflection coil where there is no effective length winding portion is occupied by the protrusion on the inner surface of the magnetic core, and does not become a gap. Therefore, the deflection efficiency can be improved.

According to a third aspect of the present invention, there is provided a magnetic core having a trumpet shape having an opening having a small area and an opening having a large area. In some cases, the magnetic core has a shape including at least one pair of opposing straight sides or loosely curved arc sides. The magnetic core according to the third aspect can be suitably used for the deflection yoke according to the first aspect.

In a fourth aspect, the present invention provides the magnetic core according to the third aspect, wherein the magnetic core has a concave portion for accommodating an effective length winding portion of the vertical deflection coil on an inner surface. provide. The magnetic core according to the fourth aspect can be suitably used for the deflection yoke according to the second aspect.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the embodiments shown in the drawings. Note that the present invention is not limited by this.

FIG. 1 is a sectional view showing a deflection yoke according to a first embodiment of the present invention. The deflection yoke 100 includes a coil separator 7, a pair of horizontal deflection coils 5 disposed inside the coil separator 7, and the coil separator 7.
And a magnetic core 1 </ b> A disposed outside the vertical deflection coil 6.

The coil separator 7 is formed in a trumpet shape having an opening with a small area and an opening with a large area, integrally or by combining a plurality of divided members. FIG. 1 shows a cross section of an intermediate portion between the two openings, and the cross section has a track shape having a pair of straight sides 7h opposed vertically and an arc-shaped side opposed left and right. . The pair of straight sides 7h opposed to each other in the upper and lower directions are provided so as to crush the upper and lower ridges Wh as shown in FIG. 5, and are parallel to the horizontal axis of the CRT. When viewed three-dimensionally, the straight side portion 7h forms a flat portion. Instead of the straight side portion 7h, an arc-shaped side portion that is gently curved with a larger radius of curvature than the left and right arc-shaped side portions may be used.

The horizontal deflection coil 5 has the same configuration as the conventional one. Usually, it is a saddle type.

The vertical deflection coil 6 is partially formed on the linear side 6h along the upper and lower linear sides 7h of the coil separator 7. That is, a part is formed on the straight side portion 6h so as to crush the upper and lower ridge portions Wh as shown in FIG. When viewed three-dimensionally, a part of the coil separator 7 is formed in a planar portion along the planar portion formed by the linear side portion 7h. Otherwise, the configuration is the same as the conventional one. Usually, it is a saddle type or a toroidal type.

The magnetic core 1A has a trumpet shape having a small-area opening and a large-area opening, integrally or by combining a plurality of divided members. FIG. 1 shows a cross section of an intermediate portion between the two openings. The cross section has a pair of linear sides 1h opposed vertically and a linear side 1v opposed also to the left and right; The portion of the vertical deflection coil 6 where there is no effective winding portion has a projection 1t.
The upper and lower linear sides 1h are partially formed in the linear sides 1h along the upper and lower linear sides 6h of the vertical deflection coil 6. That is, a part is formed in the linear side portion 1h so as to crush the upper and lower ridge portions Wh as shown in FIG. When viewed three-dimensionally, the vertical deflection coil 6
A part is formed in the planar portion along the planar portion formed by the linear side portion 6h. The left and right straight sides 1v are provided so as to crush the left and right mud portions Wv as shown in FIG. 5, and are parallel to the vertical axis of the CRT. When viewed three-dimensionally, the linear side portion 1v forms a planar portion. Instead of the straight sides 1h and 1v, an arc-shaped side that is gently curved with a large radius of curvature may be used. The effective length winding portion of the vertical deflection coil 6 is accommodated in the concave portion between the convex portions 1t. The outer surface of the magnetic core 1A is shaped to match the inner circumference.

According to the deflection yoke 100 of the first embodiment, the following effects can be obtained. (1) As shown in FIG. 5, the upper and lower mounds Wh are eliminated, and no air gap is generated inside the magnetic core 1A by that much.
The deflection efficiency can be improved. (2) Since the left and right mud portions Wv as shown in FIG. 5 are eliminated, and no air gap is generated inside the magnetic core 1A by that amount,
The deflection efficiency can be improved. (3) The portion of the vertical deflection coil 6 where there is no effective length winding is
It is occupied by the protrusion 1t on the inner surface of the magnetic core 1A, and does not form a void. Therefore, the deflection efficiency can be improved. (4) A pair of opposed linear sides 1h are parallel to the horizontal axis of the CRT and a pair of opposed linear sides 1v.
Uses the magnetic core 1A parallel to the vertical axis of the CRT, so that the conventional annular magnetic core 5 having a small curvature is used.
1, a uniform magnetic field can be easily formed, and this is advantageous in various characteristics such as convergence, distortion, and focus.

Second Embodiment FIG. 2 is a sectional view showing a deflection yoke according to a second embodiment of the present invention. The deflection yoke 200 uses the magnetic core 1B of the deflection yoke 100 according to the first embodiment without the protrusion 1t of the magnetic core 1A.

According to the deflection yoke 200 of the second embodiment, the following effects can be obtained. (1) Since the upper and lower ridges Wh as shown in FIG. 5 are eliminated, and no air gap is generated inside the magnetic core 1B by that much,
The deflection efficiency can be improved. (2) Since the left and right mud portions Wv as shown in FIG. 5 are eliminated, and no air gap is generated inside the magnetic core 1B by that amount,
The deflection efficiency can be improved. (3) A pair of opposed straight sides 1h are parallel to the horizontal axis of the CRT and a pair of opposed straight sides 1v.
Uses the magnetic core 1B parallel to the vertical axis of the CRT, so that the conventional annular magnetic core 5 having a small curvature is used.
1, a uniform magnetic field can be easily formed, and this is advantageous in various characteristics such as convergence, distortion, and focus.

Third Embodiment FIG. 3 is a sectional view showing a deflection yoke according to a third embodiment of the present invention. The deflection yoke 300 includes a magnetic core 1C in which left and right linear sides 1v of the magnetic core 1A of the deflection yoke 100 according to the first embodiment are changed to convex portions 1t.
Is used.

According to the deflection yoke 300 of the third embodiment, the following effects can be obtained. (1) As shown in FIG. 5, the upper and lower mud portions Wh are eliminated, and no air gap is generated inside the magnetic material core 1C by that amount.
The deflection efficiency can be improved. (2) Since the left and right mud portions Wv as shown in FIG. 5 are eliminated, and no air gap is formed inside the magnetic core 1C by that amount,
The deflection efficiency can be improved. (3) The portion of the vertical deflection coil 6 where there is no effective length winding is
It is occupied by the protrusion 1t on the inner surface of the magnetic core 1C, and does not form a void. Therefore, the deflection efficiency can be improved. (4) Since the pair of opposed linear sides 1h use the magnetic core 1C that is parallel to the horizontal axis of the CRT, the magnetic core 1C is more uniform than the conventional annular magnetic core 51 having a small curvature. A magnetic field is easily formed, which is advantageous in various characteristics such as convergence, distortion, and focus.

Fourth Embodiment FIG. 4 is a sectional view showing a deflection yoke according to a fourth embodiment of the present invention. The deflection yoke 400 has a straight side portion 1v facing left and right so as to crush the left and right mado portions Wv of the magnetic core 51 of the conventional deflection yoke 500 shown in FIG.
Are provided using a magnetic core 1D provided with a magnetic core.

According to the deflection yoke 400 of the fourth embodiment, the following effects can be obtained. (1) Since the left and right mud portions Wv as shown in FIG. 5 are eliminated, and no air gap is generated inside the magnetic core 1D by that amount,
The deflection efficiency can be improved. (2) Since only the magnetic core 1D is changed and the coil separator 57 and the vertical deflection coil 56 can use the conventional configurations as they are, implementation is easy. (3) Since the pair of opposed linear sides 1v use the magnetic core 1D in which the pair is opposed to the vertical axis of the CRT, the magnetic core 1D is more uniform than the conventional annular magnetic core 51 having a small curvature. A magnetic field is easily formed, which is advantageous in various characteristics such as convergence, distortion, and focus.

[0024]

According to the deflection yoke and the magnetic core of the present invention, the following effects can be obtained. (1) Since no air gap is generated inside the magnetic core, the deflection efficiency can be improved. (2) Since the portion of the vertical deflection coil 6 where there is no effective length winding portion is occupied by the protrusion on the inner surface of the magnetic core and does not form a gap, the deflection efficiency can be improved. (4) Since the magnetic core has a shape that can easily form a uniform magnetic field, it is advantageous in various characteristics such as convergence, distortion, and focus.

[Brief description of the drawings]

FIG. 1 is a sectional view of a deflection yoke according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a deflection yoke according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a deflection yoke according to a third embodiment of the present invention.

FIG. 4 is a sectional view of a deflection yoke according to a fourth embodiment of the present invention.

FIG. 5 is a sectional view showing an example of a conventional deflection yoke.

[Explanation of symbols]

 100 to 400 Deflection yoke 1A to 1D Magnetic core 1h, 1v Linear side 1t Convex portion 5 Horizontal deflection coil 6 Vertical deflection coil 7 Coil separator L Rib portion Wh, Wv Mad portion

Claims (6)

[Claims] 1. A deflection system comprising: a pair of horizontal deflection coils disposed inside a coil separator; a pair of vertical deflection coils disposed outside the coil separator; and a magnetic core disposed outside the vertical deflection coil. A yoke, wherein the magnetic core has a trumpet shape having a small-area opening and a large-area opening, and a shape inside a cross section of an intermediate portion between the two openings (when unevenness is present, a shape in which unevenness is equalized) ) Is a shape including at least one pair of opposing straight sides or slightly curved arc sides. 2. The deflection yoke according to claim 1, wherein
The deflection yoke, wherein the horizontal deflection coil and the vertical deflection coil are saddle type coils. 3. The deflection yoke according to claim 1, wherein
A deflection yoke, wherein the horizontal deflection coil is a saddle type coil and the vertical deflection coil is a toroidal type coil. 4. The deflection yoke according to claim 1, wherein a recess for accommodating an effective length winding portion of the vertical deflection coil is provided on an inner surface of the magnetic core. Deflection yoke. 5. A magnetic core having a trumpet shape having an opening having a small area and an opening having a large area, the inner shape of a cross section of an intermediate portion between the openings (a shape having unevenness if there is unevenness). ) Is a shape including at least one pair of opposing straight sides or slightly curved arc sides. 6. The magnetic core according to claim 1, wherein
A magnetic core having a concave portion for accommodating an effective length winding portion of a vertical deflection coil on an inner surface.