JP2002329466A - Deflecting yoke and cathode-ray tube equipment equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deflecting yoke, which can aim at reduction of deflecting electric power and manufacturing cost and reduction of heat value, and cathode- ray tube equipment equipped with this. SOLUTION: A vacuum envelope has an almost truncated polygonal pyramid shaped yoke mounting part, and the deflecting yoke, which is placed on the yoke mounting part, is equipped symmetrically to its center axis, and has a pair of saddle type horizontal deflecting coils 30a and 30b, which are made to have the shape of the almost truncated polygonal pyramid. A separator 33 is formed in the perimeter side of the horizontal deflecting soils, and a magnetic body core 34 of a mostly truncated-cone shape is formed in the outside of the separator, in the same axis with the main axis. A pair of vertical deflecting coils is wound in a troidal manner to the magnetic body core. In a direction of a horizontal axis, which intersects vertically with the center axis of the horizontal deflecting coils, the relation, which the maximum diameter on the vertical axis of the horizontal deflecting coils > the maximum diameter of the vertical axis on the core is filled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke in a cathode ray tube device such as a color picture tube and a cathode ray tube device provided with the deflection yoke.

[0002]

2. Description of the Related Art As a cathode ray tube device, for example, a color picture tube includes a glass panel having a substantially rectangular effective portion,
A vacuum envelope comprising a glass funnel connected to the panel and a cylindrical glass neck connected to a small diameter portion of the funnel is provided. On the inner surface of the effective portion of the panel, a phosphor screen including a three-color phosphor layer in a dot shape or a stripe shape emitting blue, green, and red light and a black light-shielding layer is formed. In the vacuum envelope, a shadow mask having a large number of electron beam passage holes is arranged so as to face the phosphor screen. An electron gun for emitting three electron beams is provided in the neck, and a deflection yoke is mounted on a yoke mounting portion located from the outer circumference of the neck to the outer peripheral surface of the funnel.

In the color picture tube having the above structure, three electron beams emitted from the electron gun are horizontally and horizontally generated by a deflection yoke.
A color image is displayed by deflecting horizontally and vertically by a vertical deflecting magnetic field and scanning the phosphor screen horizontally and vertically via a shadow mask.

Further, as a color picture tube as described above,
2. Description of the Related Art Self-convergence in-line type color picture tubes are widely used. According to this color picture tube, the electron gun is configured as an in-line type that emits three electron beams arranged in a line passing on the same plane, and the deflection yoke has a pincushion-type horizontal deflection magnetic field and a barrel type. The vertical deflection magnetic field is generated.
Then, the three electron beams emitted from the electron gun and arranged in a line are deflected by these horizontal and vertical deflection magnetic fields, and the three electron beams arranged in a line over the entire screen without requiring special correction means. Can concentrate.

On the other hand, in the above-mentioned color picture tube, the deflection yoke is a large power consumption source, and it is important to reduce the power consumption of the deflection yoke when reducing the power consumption of the cathode ray tube. In recent years, higher resolution and higher visibility have been required, and usage conditions with a higher deflection frequency have been increasing. When the deflection yoke is operated at such a high deflection frequency, the heat generated by the deflection yoke becomes enormous. In addition, HD (High Definition)
In order to support a monitor of an OA device such as a television or a PC (personal computer), the deflection frequency must be increased, and all of them cause an increase in deflection power and an increase in heat generated by the deflection yoke.

Generally, in order to reduce the deflection power, the working space of the deflection magnetic field is reduced by reducing the diameter of the neck of the cathode ray tube and the outer diameter of the yoke mounting portion where the deflection yoke is mounted. On the other hand, it is preferable that the deflection magnetic field acts efficiently.

However, in a conventional cathode ray tube device having a frustum-shaped yoke mounting portion, since the electron beam has already passed close to the inner surface of the yoke mounting portion of the vacuum envelope, the neck diameter and the outer diameter of the yoke mounting portion have been reduced. If the diameter is further reduced, the electron beam hits the inner surface of the yoke mounting portion before reaching the phosphor screen, and a portion where the electron beam does not collide with the phosphor screen occurs at a portion having the maximum deflection angle. Further, if the electron beam keeps colliding with the inner surface of the yoke mounting portion, the temperature of that portion rises as the glass melts, and the vacuum envelope may be imploded. Therefore, in the conventional cathode ray tube device, it is difficult to reduce the deflection power by further reducing the neck diameter and the outer diameter of the yoke mounting portion.

As a means for solving such a problem, when a rectangular raster is drawn on the phosphor screen, it is considered that the electron beam passage area inside the yoke mounting portion where the deflection yoke is mounted is also substantially rectangular. 1 shows that the funnel yoke mounting portion has a shape that gradually changes from a circular shape toward a panel direction from the neck side to a substantially rectangular shape.

When the yoke mounting portion of the funnel is formed substantially in the shape of a truncated pyramid, the major axis (horizontal axis) and the short axis (vertical axis) of the yoke mounting portion remain the same in the diagonal direction having the largest deflection angle. ) Direction diameter can be reduced.
This makes it possible to bring the horizontal and vertical deflection coils of the deflection yoke closer to the electron beam, efficiently deflect the electron beam, and reduce the deflection power.

On the other hand, as the deflection yoke, a saddle / saddle type deflection yoke in which both the horizontal and vertical deflection coils are saddle type, a semi-toroidal type deflection yoke in which the horizontal deflection coil is saddle type and the vertical deflection coil is toroidal type, and the like. There are various types. For example, JP-A-11-26
In the saddle / saddle type deflection yoke disclosed in Japanese Patent No. 5668, a pair of saddle-shaped truncated pyramid-shaped horizontal deflection coils arranged inside a separator made of an insulator and a pair arranged outside the separator. And a truncated pyramid-shaped vertical deflection coil wound in a saddle shape, and a truncated pyramid-shaped magnetic core provided outside the vertical deflection coil so as to cover the vertical deflection coil.

[0011]

However, the saddle / saddle type deflection yoke having the above-described basic structure can reduce the deflection power more than the semi-toroidal type deflection yoke, but it requires a magnetic material. It is difficult to manufacture a truncated pyramid-shaped core, and it is also difficult to form a vertical deflection coil around the truncated pyramid-shaped core by toroidal winding. Therefore, the manufacturing cost of the deflection yoke increases, and the versatility is lacking.

An object of the present invention is to provide a deflection yoke capable of reducing deflection power and manufacturing cost, and a cathode ray tube device having the same. .

[0013]

In order to achieve the above object, a deflection yoke according to the present invention combines a substantially frustoconical core and a toroidally wound vertical deflection coil, and a horizontal deflection coil has a substantially frustum shape. The saddle type is wound.

That is, the deflection yoke according to the present invention comprises:
A pair of saddle-shaped horizontal deflection coils, which are provided symmetrically with respect to the central axis and have a substantially truncated pyramid shape, are provided coaxially with the central axis and arranged on the outer peripheral side of the horizontal deflection coil. A magnetic core having a substantially frustoconical shape, and a pair of vertical deflection coils toroidally wound around the magnetic core, and a horizontal axis direction and a vertical axis orthogonal to each other in a cross section orthogonal to the center axis of the horizontal deflection coil. The maximum diameter of the diagonal axis on the diagonal axis that is located between the axial directions and is the maximum diameter of the horizontal deflection coil, the maximum diameter on the vertical axis on the vertical axis, and the maximum diameter of the horizontal axis on the horizontal axis are ( The maximum deflection angle on the vertical axis + the maximum diameter on the horizontal axis) / (2 × the maximum diameter on the diagonal axis) ≦ 0.9, and the maximum deflection angle is set to 100 ° or more;
In a cross section orthogonal to the center axis of the horizontal deflection coil,
The maximum diameter on the vertical axis on the vertical axis of the horizontal deflection coil and the maximum diameter of the magnetic core have a relationship of the maximum diameter on the vertical axis of the horizontal deflection coil> the maximum diameter of the magnetic core. Features.

A cathode ray tube device according to the present invention includes a panel having a phosphor screen formed on an inner surface thereof, a funnel connected to the panel, and a cylindrical neck connected to a small-diameter end of the funnel. A vacuum envelope in which a substantially truncated pyramid-shaped yoke mounting portion is formed from the neck to the outer periphery of the funnel; and a vacuum envelope disposed in the neck of the vacuum envelope and facing the phosphor screen toward the phosphor screen. An electron gun for emitting a beam, and the deflection yoke according to claim 1 or 2, which deflects the electron beam mounted on the outside of the yoke mounting portion in horizontal and vertical directions.

According to the deflection yoke and the cathode ray tube device having the same according to the present invention, the horizontal deflection coil is formed into a substantially truncated pyramid shape to efficiently deflect the electron beam and to reduce the deflection power. The reduction can be achieved, and the manufacturing can be easily performed by using the substantially frustoconical magnetic core. In addition, heat dissipation is improved, and heat generation of the deflection yoke can be suppressed.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a color cathode ray tube device according to an embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 and 2, the color cathode ray tube device includes a vacuum envelope 10,
A substantially rectangular panel 1 having a skirt 2 at the periphery;
It has a funnel 4 connected to the skirt portion of the panel and a cylindrical neck 3 connected to the small diameter portion of the funnel. Panel 1 has a substantially flat outer surface. On the inner surface of the panel 1, a phosphor screen 12 composed of a plurality of phosphor layers respectively emitting red, green, and blue light and a light shielding layer
Are formed. A yoke mounting portion 15 is formed on the outer periphery from the neck 3 to the funnel 4, and a deflection yoke 14 is mounted on the yoke mounting portion. An electron gun 16 for emitting three electron beams 20R, 20G, and 20B toward the phosphor layer of the phosphor screen is provided in the neck.
Is arranged.

Inside the panel 1, a shadow mask 18 having a color selection function is arranged while being supported by a mask frame 17. The shadow mask 18 has a large number of electron beam passage holes, and color-selects the electron beams 20R, 20G, and 20B emitted from the electron gun 16, and performs color selection so that the electron beams reach the phosphor layers corresponding to each color. Do.

The vacuum envelope 10 has a tube axis Z extending coaxially with the neck 3 and extending through the center of the phosphor screen 12 and a horizontal axis (long axis) extending perpendicular to the tube axis. ) X,
An axis extending perpendicular to the tube axis and the horizontal axis is defined as a vertical axis (short axis) Y.

In the color cathode ray tube device having the above configuration, the electron beams 20R, 20G, 20E emitted from the electron gun 16 are used.
B is deflected by the horizontal and vertical deflection magnetic fields generated from the deflection yoke 14 and color-selected by the shadow mask 18. Then, the phosphor screen 12 is horizontally and vertically scanned.
The image is displayed.

As shown in FIGS. 2 and 3, the yoke mounting portion 15 of the vacuum envelope 10 is formed in a shape that gradually changes from a circular shape to a substantially rectangular shape in the direction of the panel 1 from the neck 7 side. . By forming the yoke mounting portion 15 in a substantially truncated pyramid shape in this manner, the diameter of the deflection yoke 14 in the horizontal axis X and vertical axis Y directions can also be reduced. It is possible to deflect well and to reduce deflection power.

On the other hand, as shown in FIGS. 1 and 4 to 6, the deflection yoke 14 includes a pair of horizontal deflection coils 30a and 30b for generating a magnetic field for deflecting the electron beam in the horizontal axis X direction. A pair of vertical deflection coils 32a for generating a magnetic field for deflecting the electron beam in the vertical axis Y direction;
32b. A pair of horizontal deflection coils 30
a and 30b are each made of a saddle-shaped coil.
The two horizontal deflection coils together form a truncated pyramid. And, these horizontal deflection coils 30a, 30b
Is attached along the inner peripheral surface of a separator 33 formed of a synthetic resin or the like. This separator is formed in a substantially truncated pyramid shape corresponding to the yoke mounting portion 15.

As shown in FIG. 6, the horizontal deflection coil 30
a, a vertical axis Y in a cross section orthogonal to the central axis of 30b
A is the maximum diameter of the diagonal axis on the diagonal axis D which is located between the horizontal axis and the horizontal axis X direction and is the maximum diameter of the horizontal deflection coil, B is the maximum diameter on the vertical axis on the vertical axis Y, and B is the horizontal axis. Assuming that the maximum diameter of the horizontal axis on X is C, if the horizontal deflection coil is formed so as to satisfy the relationship of (B + C) / (2 × A) ≦ 0.9, the effect of reducing the deflection power sharply increases. As a result, it is possible to reduce the power consumption by about 10 to 30% compared to the conventional horizontal deflection coil having a substantially truncated cone shape. When the above value is larger than 0.9, the effect of reducing the deflection power is 10% or less.

A truncated conical core 34 made of a magnetic material is mounted on the outer peripheral side of the separator 33 and coaxially surrounds the separator. And a pair of vertical deflection coils 32
a and 32b are toroidally wound around the core 34, respectively. The core 34 is formed so as to be divided into two along a plane including the central axis, and is fixed to each other by fixing pieces 36.

In the deflection yoke 14, the optimum position with respect to the truncated pyramid-shaped horizontal deflection coils 30a and 30b,
And the length of the tube axis Z direction, the frustum-shaped core 3
4, the inner diameter or the outer diameter of the large-diameter end portion is determined according to the diameter on the diagonal axis on the large-diameter side of the horizontal deflection coils 30a and 30b. That is, the horizontal deflection coils 30a and 30b are formed in a truncated pyramid shape,
When 4 is formed in a truncated cone shape, the inner peripheral surface of the core is
It is located closest to the diagonal axis D of each horizontal deflection coil.

At this time, as shown in FIGS. 7 and 8, when focusing on the positional relationship between the horizontal deflection coil 30a and the core 34 in a cross section orthogonal to the central axis of the horizontal deflection coils 30a and 30b, the horizontal deflection power Is changed according to the position of the large-diameter end of the core 34. In FIG. 8, the large-diameter end position of the core 34 is positive on the phosphor screen side and negative on the neck side with reference to a reference line RL that is the center of electron beam deflection in the deflection yoke 14. As shown in FIG. 8, as the deflection angle of the electron beam increases as (a) 90 °, (b) 100 °, and (c) 110 °, the tip position of the core when the horizontal deflection power is minimized is It turns out that it changes to a neck side.

As shown in FIGS. 7A and 8, when the deflection angle of the deflection yoke 19 is 90 °, the horizontal deflection coil 3
In a cross section orthogonal to the central axis of Oa, the maximum diameter F on the vertical axis of the core 34 and the maximum diameter B on the vertical axis of the horizontal deflection coil 30a on the vertical axis Y when the horizontal deflection power is minimized are B < F.

On the other hand, as shown in FIGS. 7 (b) and 8, when the deflection angle of the deflection yoke 19 is 100 ° or more, the horizontal deflection power in the cross section orthogonal to the central axis of the horizontal deflection coil 30a. Is smaller than the maximum diameter F on the vertical axis of the magnetic core 34 on the vertical axis Y and the maximum diameter B on the vertical axis of the horizontal deflection coil 30a in a relationship of B> F.

Therefore, according to the present embodiment, the deflection angle of the deflection yoke 19 is set to 100 ° or more and the horizontal deflection coil 3
In a cross section orthogonal to the central axis of Oa, the maximum diameter F on the vertical axis of the magnetic core 34 on the vertical axis Y and the maximum diameter B on the vertical axis of the horizontal deflection coil 30a satisfy the relationship of B> F. With this configuration, the horizontal deflection power is optimally reduced.
In order to obtain this relationship, the large-diameter end side tip position of the core 34 is more apart from the large-diameter end of the horizontal deflection coil toward the neck side along the tube axis Z direction than when the deflection angle is 90 °. Is located. For example, the length of the horizontal deflection coil along the tube axis direction of the vacuum envelope, that is, the length of the horizontal deflection coil along the central axis direction is L, the large diameter end of the horizontal deflection coil and the large diameter of the core 34. When the distance from the side tip is E, E>
It is set to 0.1L.

According to the color cathode ray tube device constructed as described above, the yoke mounting portion 15 of the vacuum outer peripheral device 10 is formed in a substantially rectangular trapezoidal shape, and at the same time, the horizontal deflection coil 30a,
Reference numeral 30b is formed in a substantially truncated pyramid shape corresponding to the yoke mounting portion 15. Therefore, the diagonal diameter of the electron beam having the largest deflection angle is the same as the conventional one, and the horizontal deflection coils 30a, 3a
The horizontal axis diameter and the vertical axis diameter of 0b can be reduced, and the horizontal deflection coils 30a and 30b can be made closer to the electron beam. As a result, the electron beam can be efficiently deflected, and the deflection power of the deflection yoke 14 can be reduced.

In a section perpendicular to the central axis of the horizontal deflection coil, the maximum diameter of the core on the vertical axis on the vertical axis and the maximum diameter of the horizontal deflection coil on the vertical axis are defined as the maximum diameter of the horizontal deflection coil on the vertical axis> By configuring so as to satisfy the relationship of the maximum diameter on the vertical axis of the core, the horizontal deflection power can be optimally reduced.

Further, the core 34 is formed in a substantially truncated cone shape,
By forming the vertical deflection coils 32a and 32b in toroidal winding, the deflection yoke can be manufactured easily and inexpensively, and at the same time, good characteristics can be obtained, when a substantially frustum-shaped core is used. .

Further, the use of the truncated conical core 34 increases the gap between the horizontal deflection coils 30a, 30b and the core 34 near the vertical axis of the deflection yoke 14, thereby suppressing heat generation from the horizontal deflection coils. Even when the deflection frequency is set high, it is possible to reduce the temperature rise of the deflection yoke.

The present invention is not limited to the above-described embodiment, but can be variously modified within the scope of the present invention. For example, the present invention is applicable not only to a color cathode ray tube device but also to a monochrome cathode ray tube device.

[0035]

As described above in detail, according to the present invention, a deflection yoke in which a horizontal deflection coil is formed in a substantially truncated pyramid shape wound in a saddle shape and a vertical deflection coil is toroidally wound in a substantially truncated conical core. And by satisfying the relationship of the maximum diameter on the vertical axis of the horizontal deflection coil> the maximum diameter on the vertical axis of the core, it is possible to reduce deflection power and manufacturing cost, and to generate heat. It is possible to obtain a deflection yoke that can be suppressed and a cathode ray tube device including the deflection yoke.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a color cathode ray tube device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the back side of a vacuum envelope of the color cathode ray tube device.

3A and 3B are a side view of the vacuum envelope and a cross-sectional view showing each part of a yoke mounting portion, wherein FIG. 3A is a side view of the vacuum envelope, and FIG. 3B is a line BB in FIG. (C) is a cross-sectional view along line CC in (a),
(D) is a cross-sectional view along line DD in (a),
(D) is a sectional view along line EE in (a),
(F) is sectional drawing along line FF in (a).

FIG. 4 is a perspective view showing a deflection yoke of the color cathode ray tube device.

FIG. 5 is an exploded perspective view of the deflection yoke.

FIG. 6 is a front view and a side view of the deflection yoke.

FIG. 7 is a side view schematically showing a positional relationship between a core of the deflection yoke and a horizontal deflection coil.

FIG. 8 is a graph showing the relationship between the large-diameter end position of the core and the horizontal deflection power.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Panel 2 ... Panel skirt part 3 ... Neck 4 ... Funnel 10 ... Vacuum peripheral device 12 ... Phosphor screen 14 ... Deflection yoke 15 ... Yoke mounting part 16 ... Electron gun 17 ... Frame 18 ... Shadow mask 20R, 20G, 20B ... Electron beam 30a, 30b horizontal deflection coil 32a, 32b vertical deflection coil 33 separator 34 core 36 fixed piece

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5C032 BB11 5C042 FF02 FF05 FG08 FG27 FG32 FH07

Claims (3)

[Claims] 1. A pair of saddle-shaped horizontal deflection coils which are provided symmetrically with respect to a center axis and have a substantially truncated pyramid shape, and an outer periphery of the horizontal deflection coil which is provided coaxially with the center axis. A magnetic core having a substantially frustoconical shape disposed on the side, and a pair of vertical deflection coils wound toroidally around the magnetic core, and a cross section orthogonal to a center axis of the horizontal deflection coil,
The maximum diameter of the diagonal axis on the diagonal axis which is located between the horizontal axis direction and the vertical axis direction orthogonal to each other and is the maximum diameter of the horizontal deflection coil, the maximum diameter on the vertical axis on the vertical axis, and the maximum diameter on the horizontal axis The maximum diameter of the horizontal axis has the relationship of (maximum diameter on the vertical axis + maximum diameter on the horizontal axis) / (2 x maximum diameter on the diagonal axis) ≤ 0.9, and the maximum deflection angle is set to 100 ° or more. In a cross section orthogonal to the center axis of the horizontal deflection coil,
The maximum diameter on the vertical axis on the vertical axis of the horizontal deflection coil and the maximum diameter of the magnetic core are defined as having a relationship of the maximum diameter on the vertical axis of the horizontal deflection coil> the maximum diameter of the magnetic core. Characteristic deflection yoke. 2. The length of the horizontal deflection coil along the central axis direction is L, and the distance between the large-diameter end of the horizontal deflection coil and the large-diameter end of the magnetic core along the central axis direction is E. 2. The deflection yoke according to claim 1, wherein E> 0.1 L. 3. A panel having a phosphor screen formed on an inner surface thereof, a funnel connected to the panel, and a cylindrical neck connected to a small-diameter end of the funnel. A vacuum envelope having a substantially truncated pyramid-shaped yoke mounting portion formed thereover; an electron gun disposed in a neck of the vacuum envelope to emit an electron beam toward the phosphor screen; 3. A cathode ray tube device comprising: the deflection yoke according to claim 1 or 2, which deflects the electron beam mounted outside the yoke mounting portion in horizontal and vertical directions.