JP2002042692A - Deflection yoke and cathode-ray tube device provided with it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deflection yoke capable of reducing deflection power and manufacturing costs and a cathode-ray tube device provided with the yoke. SOLUTION: A vacuum envelop of cathode-ray tube has an approximately truncated pyramid shaped yoke fitting part. The deflection yoke 14 fitted on the yoke fitting part is mounted symmetrically to a center axis to form an approximately truncated pyramid shaped pair of straddling horizontal deflecting coils 30a, 30b. A circular truncated cone shaped magnetic core 34 is mounted coaxially on an outer circumferential side of the horizontal deflection coil for having a pair of vertical deflection coils wound toroidally on the magnetic core. At an end on a large diameter side of the magnetic core, the relation of a diameter of the magnetic core with that of each horizontal deflection coil on a vertical axis orthogonal to the center axis is; magnetic core diameter >=horizontal deflection coil diameter.

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 part of the panel, a phosphor screen composed of a three-color phosphor layer in the form of dots or stripes emitting blue, green, and red light and a black light-shielding layer is formed. Is
Opposite to the phosphor screen, a shadow mask having a number of electron beam passage holes is arranged. Also,
An electron gun that emits three electron beams is provided in the neck, and a deflection yoke is mounted on a yoke mounting portion located from the outer periphery 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.
It is configured to generate a pincushion-type horizontal deflection magnetic field and a barrel-type vertical deflection magnetic field. The three electron beams emitted from the electron gun are arranged in a line,
By deflecting by the horizontal and vertical deflecting magnetic fields, three electron beams arranged in a line can be concentrated over the entire screen without special correction means.

[0005] On the other hand, in the above-mentioned cathode ray tube device, the deflection yoke is a large power consumption source, and it is important to reduce the power consumption of the deflection yoke in reducing the power consumption of the cathode ray tube device. 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 amount of heat generated by the deflection yoke becomes enormous. Further, in order to support a monitor of an OA device such as an HD (High Definition) TV or a PC (Personal Computer), the deflection frequency must be increased. Causes an increase in heat generation.

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 the 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 minor axis (vertical axis) of the deflection yoke remain the same in the diagonal direction having the largest deflection angle. The diameter in the direction can be reduced. This makes it possible to bring the horizontal and vertical deflection coils of the deflection yoke closer to the electron beam, deflect efficiently 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, in a saddle / saddle type deflection yoke, a pyramid-shaped horizontal deflection coil wound around a pair of saddles arranged inside a separator made of an insulator, and a pair of saddle types arranged outside the separator. The vertical deflection coil has a pyramid shape and a core made of a truncated pyramid-shaped magnetic material provided outside the vertical deflection coil so as to cover the vertical deflection coil.

[0011]

However, in the saddle / saddle type deflection yoke having the basic structure as described above,
There are problems such as an increase in heat generation and generation of a leakage magnetic field in the front bend portion of the horizontal deflection coil. The saddle / saddle type deflection yoke can reduce the deflection power more than the semi-toroidal type deflection yoke, but it is difficult to manufacture a truncated pyramid-shaped core made of a magnetic material. It is also difficult to form a toroidal winding of the vertical deflection coil around the core. Therefore, the manufacturing cost of the deflection yoke increases, and the versatility is lacking.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to provide a deflection yoke capable of reducing deflection power and manufacturing cost, and a cathode ray tube device having the same. It is in.

[0013]

In order to achieve the above object, a deflection yoke according to the present invention focuses particularly on a core, and combines a truncated conical core with a toroidal type vertical deflection coil to form a horizontal deflection coil. Is shaped like a truncated pyramid wound in a saddle shape.

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. An approximately frustoconical magnetic core, and a pair of vertical deflection coils toroidally wound around the magnetic core, and at the large-diameter end of the magnetic core,
The relationship between the diameter of the magnetic core and the diameter of the horizontal deflection coil on a vertical axis orthogonal to the central axis is characterized in that the diameter of the magnetic core is equal to or greater than the diameter of the horizontal deflection coil.

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 truncated pyramid-shaped yoke mounting portion is formed from the neck to the outer periphery of the funnel; and an electron beam disposed in the neck of the vacuum envelope and directed toward the phosphor screen. And a deflection yoke mounted on the outside of the yoke mounting portion. The deflection yoke is provided symmetrically with respect to a central axis, and has a pair of saddles having a substantially truncated pyramid shape. A horizontal deflection coil, a substantially frustoconical magnetic core provided coaxially with the center axis and disposed on the outer peripheral side of the horizontal deflection coil, and a toroidal winding around the magnetic core. And a pair of vertical deflection coils, at the large-diameter end of the magnetic core, the diameter of the magnetic core and the diameter of the horizontal deflection coil on a vertical axis orthogonal to the central axis. The relationship is characterized in that the diameter of the magnetic core ≧ the diameter of the horizontal deflection coil.

According to the deflection yoke configured as described above and the cathode ray tube device having the same, the electron beam is efficiently deflected by reducing the deflection power by making the horizontal deflection coil substantially in the shape of a truncated pyramid. While being able to
The use of the frusto-conical magnetic core can reduce the manufacturing cost. In addition, heat dissipation is improved, heat generation of the deflection yoke can be suppressed, and the leakage magnetic field of the horizontal deflection coil can be absorbed by the magnetic core.

[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. On the inner surface of the panel 1, a plurality of phosphor layers respectively emitting red, green and blue light, and a phosphor screen 12 formed of 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 that emits three electron beams 20R, 20G, and 20B toward the phosphor layer of the phosphor screen is disposed in the neck.

A shadow mask 18, which is supported by a frame 17 and has a color selecting function, is provided between the electron gun 16 and the phosphor screen 12 inside the panel 1. The shadow mask 18 shapes the electron beams 20R, 20G, and 20B emitted from the electron gun 16 and projects a beam spot on a phosphor layer of a specific color.

In the vacuum envelope 10, the neck 3
The axis extending coaxially with the center of the phosphor screen 12 is the tube axis Z, and the axis extending perpendicular to the tube axis is the horizontal axis (H axis).
X and an axis extending perpendicular to the tube axis and the horizontal axis are defined as a vertical axis (V axis) Y.

In the color cathode ray tube apparatus having the above-described structure, the three electron beams emitted from the electron gun 16 are deflected along the horizontal axis and the vertical axis by the magnetic field generated from the deflection yoke 14, A color image is displayed by scanning the phosphor screen 12 horizontally and vertically.

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 making the yoke mounting portion 15 substantially in the shape of a truncated pyramid, the diameter of the deflection yoke 14 in the horizontal axis X and vertical axis Y directions can be reduced.
Therefore, the horizontal deflection coils 30a, 3a of the deflection yoke 14
It is possible to efficiently deflect the electron beam by bringing 0b closer to the electron beam and reduce the 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 the separator 33 formed of a synthetic resin or the like. This separator 33
Is formed in a substantially truncated pyramid shape corresponding to the yoke mounting portion 15.

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. The pair of vertical deflection coils 32a 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.

Also, in the deflection yoke 14, the panel-side end of the truncated cone-shaped core 34 is selected in consideration of the optimum position of the truncated pyramid-shaped horizontal deflection coils 30a and 30b and the length in the tube axis Z direction. That is, the inner diameter or 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, when the horizontal deflection coils 30a and 30b are formed in a truncated pyramid shape and the core 34 is formed in a truncated cone shape, the inner peripheral surface of the core is closest to the diagonal axis portion of each horizontal deflection coil. To position. Therefore, as shown in FIG. 7 and FIG.
Is the radius of the horizontal deflection coil at the position B where the plane A including the large diameter end and perpendicular to the tube axis Z and the diagonal axis of the horizontal deflection coils 30a, 30b intersect. Is set almost equal to

As shown in FIGS. 7 to 9, a truncated cone-shaped core 34, a truncated pyramid-shaped horizontal deflection coil 30a, 30b wound in a saddle shape, and a vertical deflection coil wound toroidally around the core. When the deflection yoke 14 is viewed from the neck side, the relationship of the diameter V1 of the core and the diameter V2 of the horizontal deflection coil at any position on the vertical axis Y is satisfied. The gap between the horizontal deflection coils 30a and 30b and the core 34 is largest near the vertical axis Y of the deflection yoke 14. In the case of a deflection yoke applied to a color cathode ray tube having a diagonal dimension of 76 cm and an almost complete flat panel outer surface, a core 34 and a horizontal deflection coil 30 are used.
a, at the large diameter end of 30b, C1 = 53.6 mm,
C2 is set to 50.9 mm.

According to the color cathode ray tube apparatus constructed as described above, the yoke mounting portion 15 of the vacuum envelope 10 is formed in a substantially truncated pyramid shape, and at the same time, the horizontal deflection coil 30a,
Reference numeral 30b is formed in a truncated pyramid shape corresponding to the yoke mounting portion. Therefore, the diameter of the electron beam in the diagonal direction where the deflection angle is the largest is kept as it is, and the horizontal deflection coils 30a and 30b
Can be reduced in the horizontal axis X and vertical axis Y directions, 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.

Further, by forming the core 34 in a truncated conical shape and forming the vertical deflection coils 32a and 32b in toroidal winding, the manufacturing cost of the deflection yoke is reduced as compared with the case of using a truncated pyramid-shaped core. Can be reduced, and at the same time, good characteristics can be obtained. Due to the magnitude relationship between the core 34 and the horizontal deflection coils 30a and 30b, the leakage magnetic field of the horizontal deflection coil can be absorbed to some extent by the core.

Further, the use of the frusto-conical core 34 increases the gap between the horizontal deflection coils 30a, 30b and the core 34 near the vertical axis Y of the deflection yoke 14. Therefore, the heat from the horizontal deflection coil can easily escape, and the temperature rise of the deflection yoke 14 can be sufficiently suppressed even when the deflection frequency is increased.

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.

[0030]

As described above, according to the present invention, the horizontal deflection coil is formed in a truncated pyramid shape wound in a saddle shape, and the vertical deflection coil is formed in a toroidal shape around a truncated conical core. It is possible to obtain a deflection yoke capable of suppressing the deflection power and the manufacturing cost and suppressing the heat generation and the magnetic field leakage of the horizontal deflection coil, and a cathode ray tube device including the same.

[Brief description of the drawings]

FIG. 1 is a side view of a color cathode ray tube device according to an embodiment of the present invention, partially cut away.

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 a sectional view taken 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 a side view of the deflection yoke.

FIG. 6 is an exploded perspective view of the deflection yoke.

FIG. 7 is a side view schematically showing an arrangement of a core of the deflection yoke and a horizontal deflection coil.

FIG. 8 is a diagram schematically showing a relationship between a diameter of a core of the deflection yoke and a horizontal deflection coil.

FIG. 9 is a view schematically showing a state in which the deflection yoke is viewed from a neck side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Panel 3 ... Neck 4 ... Funnel 10 ... Vacuum envelope 14 ... Deflection yoke 15 ... Yoke mounting part 16 ... Electron gun 30a, 30b ... Horizontal deflection coil 32a, 32b ... Vertical deflection coil 33 ... Separator 34 ... Core

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masayo Inoue 1-9-2, Hara-cho, Fukaya-shi, Saitama F-term in Fukaya Plant, Toshiba Corporation (reference) 5C032 AA02 BB11 5C042 FF02 FF05 FG14 FG27

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. And a pair of vertical deflection coils wound toroidally around the magnetic core. At the large-diameter end of the magnetic core, the central axis A deflection yoke characterized in that the relationship between the diameter of the magnetic core and the diameter of the horizontal deflection coil on a vertical axis orthogonal to the axis satisfies the relationship: magnetic core diameter ≧ horizontal deflection coil diameter. 2. The apparatus according to claim 2, further comprising a separator formed in a substantially truncated pyramid shape, wherein the pair of horizontal deflection coils are provided along an inner surface of the separator, and the magnetic core is disposed outside the separator. The deflection yoke according to claim 1, wherein: 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 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; A deflection yoke mounted on the outside of the mounting portion, wherein the deflection yoke is provided symmetrically with respect to a central axis, and has a pair of saddle-type horizontal deflection coils substantially in the shape of a truncated pyramid; And a pair of vertical deflection coils, which are provided coaxially with each other and arranged on the outer peripheral side of the horizontal deflection coil and are substantially frustoconical, and a pair of vertical deflection coils wound toroidally around the magnetic core. At the large diameter end of the magnetic core, the relationship between the diameter of the magnetic core and the diameter of the horizontal deflection coil on a vertical axis orthogonal to the central axis is as follows: magnetic core diameter ≧ horizontal. A cathode ray tube device having a diameter of a deflection coil.