JPH11126566A - Deflector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deflector which can generate a desired distribution of magnetic field without using any additional components such as magnet, magnetic piece, etc. SOLUTION: A wire 12 constituting the winding 10 of a deflection coil 10 is wound one turn on pins 30 furnished on a bobbin 20. The wound wire 12 is set over between a groove 20B and rib 20C and positioned by three points of the middle pin 30, groove 20B, and rib 20C. The direction of the wire 12 folds at the boundary which is the part wound on the pin 30 and oriented in different directions on the two sides of the pin 30. The pins 30 are formed on the bobbin 20 through the simultaneous, single-piece molding process, pressure fitting of separate component, etc. At the forefront of pin 32, a claw 32A is furnished for preventing the wound wire 12 from separating. This winding of wire 12 on the pins 30 causes a part of the winding to vary abruptly, which should widen the degree of freedom of the winding pattern.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflecting device provided in various kinds of cathode ray tubes such as a TV receiver and a computer display, and more particularly to a deflecting coil winding system for obtaining a more accurate image display.

[0002]

2. Description of the Related Art In recent years, display screens of cathode ray tubes have been flattened, high-scanned, and highly accurate.
The demands placed on the deflection yoke of the cathode ray tube are also increasing. On the other hand, there is a limit to the accuracy of the winding of the deflection yoke and the cost.Therefore, in order to achieve the required performance including the variation in the characteristics of the cathode ray tube, a correction circuit is mounted on the deflection yoke, and the accuracy is reduced. Raising. In addition, a display using a cathode ray tube has entered cost competition, and in recent years, further technical innovation has been required.

[0003] The direction in which the wire rod of the conventional club-shaped coil for winding a conventional bobbin is wound is determined to be the same direction from the stability of the winding, the structure of the winding machine, and the productivity. , The winding distribution was determined. Further, it has been impossible to form a winding pattern that changes rapidly. Therefore, when the magnetic field distribution of the desired harmonic component cannot be realized by the winding distribution, it has been realized by attaching other components such as a magnet and a magnetic material. There is a problem that this may occur, and it is necessary to employ a method equipped with an expensive correction circuit.

[0004]

In such a recent situation, especially with the flattening of the display screen, the geometrical relationship between the cathode ray tube and the center of the deflecting magnetic field has not worked so far. Fifth harmonic component, seventh
There is an increasing need to control the magnetic field distortion of the 9th and 9th harmonic components. However, in the conventional winding method, when the third harmonic component is determined, it is impossible to independently move the fifth harmonic component or more. Also, it is structurally difficult to change the magnetic field distribution in the Z axis (tube axis) direction.

In general, the winding distribution of a deflection coil is expressed by the following equation. f (θ) = Σan ^* cos (nθ) f (θ) = A1cos (θ) + A3cos (3θ) + A
5 cos (5θ) + A7 cos (7θ) + A9 cos
(9θ) + ···· In ^{addition, n = 1,3,5,7,9, ···· an *} = A1, A3, A5, A7, A9, ···· here, an ^* is Fourier Represents the general formula of the series constant, A
.., A3, A5, A7, A9,... Represent constant magnitudes of harmonic components of each order, and the larger the constant, the larger the magnetic field distortion of the component.

FIG. 9 shows the transition from the first term on the right side of these equations. The winding distribution is a composite of these. From the second term, a multipole magnetic field of 6 poles, a multipole magnetic field of 10 poles, a multipole magnetic field of 14 poles, and a multipole magnetic field of 18 poles are obtained. FIG. 10 shows these multipole magnetic field patterns. In an in-line color picture tube having three electron beams, good self-convergence is obtained over the entire screen by combining the above-mentioned multipole magnetic fields.

For example, misconvergence generated by a uniform magnetic field can be eliminated by winding the coil so that A3 cos (3θ) becomes +. Also, A3cos (3θ)
The misconvergence that remains after winding the A5co
It can be adjusted by the winding of s (5θ). FIG.
FIG. 1 is an explanatory diagram showing how the convergence of R and B is adjusted by such a multipole magnetic field. The solid line shows the convergence pattern of R, and the broken line shows the convergence pattern of B. Then, FIG.
Indicates the convergence pattern in the case of a uniform magnetic field,
FIG. 11B shows a convergence pattern when the winding of A3 cos (3θ) is optimized, and FIG.
Indicates a convergence pattern when the winding of A5 cos (5θ) is optimized.

It is already known that the sensitivity of convergence and image distortion varies depending on the winding distribution of the deflection yoke in the Z-axis direction. That is, the electron beam of the cathode ray tube is
The beam is emitted from the cathode and has a wide beam space before entering the deflection yoke. As the beam enters the deflection yoke, the beam is deflected in each direction while the beam space becomes narrower.
In other words, before entering the deflection yoke, the beam space is wide,
The exit is narrower. Therefore, the action of the magnetic field generated from the deflection yoke differs between the entrance and the exit of the deflection yoke. Using this sensitivity difference, the deflection yoke itself changes the magnetic field distribution along the Z-axis to correct convergence and image distortion.

FIG. 12 shows a general method of applying a magnetic field distribution. In the deflection yoke having the shape as shown in FIG. 12A, the neck side has a large sensitivity to convergence due to the wide beam space of the electron gun, and the panel side is deflected, and thus has high sensitivity to image distortion. Having. In particular, since the panel side has high sensitivity to high-order magnetic field distortion as well as image distortion, unlike the neck side, a winding that controls high-order magnetic field distortion is required. Therefore, since the winding from the neck side winding to the panel side takes into account higher-order magnetic field distortion, an inflection point is formed in the winding direction as shown in FIG.

[0010] In addition, even if the magnetic field distribution is changed along the Z axis, the wire always acts so as to be wound at the shortest distance, so that a rapidly changing winding cannot be formed. Increases variation. FIG. 13 is an explanatory diagram showing a specific example of a conventional winding method. FIG. 13A shows the bobbin 10.
This is a winding example in which the wire 102 is wound around the orthodox at 0, with a barrel magnetic field on the gun (neck) side and a pin magnetic field on the panel side. FIG. 13B shows a case where a bent winding portion 102A is inserted into a part of the winding to adjust high-order magnetic field distortion. In this case, if a desired magnetic field distribution is to be formed on the panel side of the cathode ray tube, the winding distribution will be shifted on the gun side. FIG. 13C shows a configuration in which a projection 104 is provided on a part of the bobbin 100 so that the wire 102 is hooked. In this case, the range in which the winding can be performed is limited to a certain refraction range in terms of the structure, so that there is a limit to the winding.

Therefore, conventionally, other parameters such as a magnet and a magnetic material are added to supplement the magnetic field distribution of the winding. However, when other components such as a magnet and a magnetic body are attached in this way, there is a problem that adverse effects due to these components also occur, and there is a problem that the number of components increases and cost increases. . Further, it is necessary to adopt a method in which an expensive correction circuit is mounted, so that there is a problem that the cost is further increased.

It is an object of the present invention to provide a deflection device which can obtain a desired magnetic field distribution without using additional components such as a magnet and a magnetic material.

[0013]

In order to achieve the above object, the present invention provides a deflecting device which is arranged on an outer peripheral portion of a cathode ray tube and controls an electron beam of the cathode ray tube by generating a magnetic field by a deflection coil. A bobbin around which the deflecting coil is wound, a pin for locking the wire of the deflecting coil is projected from the bobbin, and the wire of the deflecting coil is wound around the pin, so that one of the windings is formed. The part is changed rapidly.

In the deflecting device according to the present invention, a part of the winding is abruptly changed by winding an intermediate portion of the wire of the deflecting coil wound on the bobbin around a pin provided at a predetermined position on the bobbin. Structure can be obtained. Therefore, for example, a conventional example in which only a part of the winding is engaged with the projection (FIG. 13)
Compared with (C)), the degree of freedom of the winding pattern can be greatly increased, and an ideal winding can be realized. In addition, in order to form the target magnetic field distribution, components such as magnets and magnetic materials are not required, and since the magnetic field distribution is formed by windings,
It is also advantageous in terms of design, productivity and management. Particularly, in a cathode ray tube having a flat panel, high-order magnetic field distortion is required, so that an advantageous winding can be developed.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the deflection device according to the present invention will be described. FIGS. 1A and 1B are front views of a clad-type winding bobbin showing a specific example of a winding state of a deflection coil in a deflection device according to the present invention. FIG. 2 is an enlarged perspective view showing a state in which a wire material of a winding is wound around a pin provided on the bobbin shown in FIG.

As shown in the drawing, in the deflecting device of this embodiment, a wire (copper wire) 12 constituting the winding 10 of the deflecting coil is wound only once around a pin 30 provided on a bobbin 20. is there. The direction of the wire 12 is refracted around a portion wound around the pin 30, and is arranged in different directions on both sides of the pin 30. In FIGS. 1A and 1B,
Each shows an example in which the light is refracted in different directions. The bobbin 20 is integrally molded with an insulating synthetic resin or the like.
The pin 30 is provided on the bobbin 20, for example, by simultaneous integral molding. In this example, a simple cylindrical pin shape is shown. The diameter of the pin 30 is at least 1 mm or more.

FIG. 3 is a perspective view showing an example of a cathode ray tube provided with the deflection device shown in FIG. 1, and FIG. 4 is a side view showing an outline of the deflection device used in the cathode ray tube shown in FIG. . FIG. 5 is a perspective view showing the shape of the bobbin 20 of the deflecting device shown in FIG. 1. FIGS. 6A and 6B are a front (panel side) view and a rear side (neck side) of the bobbin 20. FIG.

In FIG. 3, the cathode ray tube 50 is provided with a panel 50B having a phosphor screen in front of a funnel 50A, and a neck 50C having a built-in electron gun behind the funnel 50A. The deflecting device 2 is provided on the outer periphery of the intermediate portion between the funnel 50A and the neck 50C. In FIG. 4, the deflection device 2 has a club-type horizontal deflection coil 4 disposed inside a bobbin 20, and a club-type vertical deflection coil 6 and a DY core 8 disposed outside the bobbin 20. Further, behind the bobbin 20, a magnet for purity adjustment, a magnet for convergence adjustment, and a fitting for mounting are arranged.

The bobbin 20 of the present embodiment functions as a separator for separating and insulating the horizontal deflection coil 4 and the vertical deflection coil 6, and has a wide opening on the front side corresponding to the outer peripheral shape of the cathode ray tube 50. The opening on the rear surface side is formed in a narrow trumpet-like shape, and FIGS. 5 and 6 show the shape of the upper half thereof. Also, this bobbin 20 has
A large number of sections 20A and winding grooves 2
0B are formed, and a number of ribs 20C are formed on the inner peripheral surface.
Are formed, and the horizontal deflection coil 4 is wound using these as guides. The wire 12 wound around the above-described pin 30 is stretched between the winding groove 20B and the rib 20C, and is positioned at three points of the intermediate pin 30 and the winding groove 20B and the rib 20C. It is held without any deviation.

Therefore, the winding pattern can be freely changed according to the arrangement of the pin 30, the winding groove 20B and the rib 20C. That is, the wire 12 is
There is a limit in obtaining a sharp change in the winding simply by hooking the wire, but by winding the wire 12 around the pin 30 as in this example, the degree of freedom of the winding pattern can be greatly increased, An ideal winding becomes possible. This also gives
Forming the target magnetic field distribution does not require components such as magnets and magnetic materials, and the magnetic field distribution is formed by windings, which is advantageous in terms of design, productivity, and management. Particularly, in a cathode ray tube having a flat panel, high-order magnetic field distortion is required, so that an advantageous winding can be developed.

FIG. 7 is a perspective view showing another shape of the pin 32. Although the above-described pin 30 has been shown as an example of a simple columnar shape, the pin 32 shown in FIG. 7 is a prismatic one, and further has a claw portion 32A at the tip end for retaining. That is, the claw portion 32A protrudes outward and the pin 3
By locking the wire 12 wound around the wire 2, the wire 1
The second winding portion is prevented from being detached from the pin 32.

FIGS. 8A to 8C are cross-sectional views of the bobbin 20 showing the method of providing the pins 30 and 32 on the bobbin 20 as described above.
It shows a part of a cross section when 0 is divided. 8A to 8C show examples of the pins 32. When the pins 30 and 32 are provided on the bobbin 30 by simultaneous integral molding as described above, a relatively large concave portion (having a partially penetrating portion) 22 is formed on the bobbin 20 side due to the structure of the mold at the time of molding. Will be done. If the concave portion 22 is left as it is, the insulation between the horizontal deflection coil 4 and the vertical deflection coil 6 is impaired. Therefore,
In this case, as shown in FIG. 8A, the concave portion 22 is closed with a lid-like member 24.

However, such a lid-like member 24
When the concave portion 22 is closed with the above, a part of the lid-shaped member 24 projects to the outer peripheral portion of the bobbin 20 and the vertical deflection coil 6
And may adversely affect the winding state. Therefore, as shown in FIG. 8B, the pin 30 or 32 is formed as a separate part from the bobbin 20 and the pin 30 or 32 is formed.
(The proximal end 32B of the pin 32 in FIG. 8B)
Can be adopted by press-fitting into a press-fitting hole 26 formed in the bobbin 20. This makes it possible to obtain a state in which there is no protrusion on the outer peripheral portion of the bobbin 20, while maintaining the insulating structure of the bobbin 20.

However, it is sometimes difficult to obtain a sufficient fixed state only by press-fitting as described above. Therefore, as shown in FIG.
A method can be adopted in which the base end of the pin 30 or 32 press-fitted is heat-sealed and fixed by ultrasonic welding or the like. As a result, a sufficient fixing state of the pins 30 or 32 can be obtained, and a good winding state with sufficient strength and no displacement can be maintained against the load when the wire 12 is wound. it can.

In the above example, an example in which one wire 12 is wound around the pin 20 only once has been described. However, in some cases, a plurality of wires may be wound a plurality of times. . Further, the present invention is not limited to the above-described clad-type winding, but is also applicable to a deflecting device having a winding of another type.

[0026]

As described above, in the deflecting device of the present invention, a pin for locking the wire of the deflecting coil is projected from the bobbin around which the deflecting coil is wound, and the wire of the deflecting coil is wound around the pin. By turning, a part of the winding is changed abruptly. Therefore, by rapidly changing a part of the winding, the degree of freedom of the winding pattern can be greatly increased, and an ideal winding can be realized. In addition, components such as magnets and magnetic materials are not required to form the target magnetic field distribution, and since the magnetic field distribution is formed by windings, it is advantageous in terms of design, productivity, and management. is there. Particularly, in a cathode ray tube having a flat panel, high-order magnetic field distortion is required, so that an advantageous winding can be developed.

[Brief description of the drawings]

FIG. 1 is a front view of a club-type winding bobbin showing a specific example of a winding state of a deflection coil in a deflection device according to the present invention.

FIG. 2 is an enlarged perspective view showing a state in which a wire of a winding is wound around a pin provided on the bobbin shown in FIG. 1;

FIG. 3 is a perspective view showing an example of a cathode ray tube provided with the deflection device shown in FIG.

FIG. 4 is a side view schematically showing a deflection device used in the cathode ray tube shown in FIG.

FIG. 5 is a perspective view showing a shape of a bobbin of the deflection device shown in FIG.

6A and 6B are a front view and a rear view showing a shape of a bobbin of the deflection device shown in FIG.

FIG. 7 is a perspective view showing another shape of a pin provided on the bobbin shown in FIG.

FIG. 8 is a cross-sectional view showing a method for providing a pin on the bobbin shown in FIG.

FIG. 9 is an explanatory diagram showing a change in winding distribution of a deflection coil in a conventional deflection device.

FIG. 10 is an explanatory diagram showing a pattern of a multipolar magnetic field in a conventional deflection device.

FIG. 11 shows a multi-pole magnetic field in a conventional cathode ray tube;
FIG. 9 is an explanatory diagram showing a state of adjusting the convergence of G and G.

FIG. 12 is an explanatory view showing how to give a general magnetic field distribution to the shape of a deflection yoke in a conventional deflection device.

FIG. 13 is an explanatory view showing a specific example of a conventional winding method.

[Explanation of symbols]

2 Deflection device, 4 Horizontal deflection coil, 6 Vertical deflection coil, 8 DY core, 10 Winding, 12 Wire, 20 Bobbin, 20A Section, 20B
... winding groove, 20C ... rib, 30, 32 ... pin, 32A
... claw part, 50 ... cathode ray tube, 50A ... funnel part, 50B ... panel part, 50C ... neck part.

Claims (11)

[Claims] 1. A deflecting device which is arranged on an outer peripheral portion of a cathode ray tube and generates a magnetic field by a deflection coil to control an electron beam of the cathode ray tube, comprising: a bobbin around which the deflection coil is wound; A pin for locking the wire of the deflection coil is projected from the bobbin, and the wire of the deflection coil is wound around the pin, so that a part of the winding is changed rapidly. Deflecting device. 2. The deflecting device according to claim 1, wherein the wire is wound at least once around the pin. 3. The deflecting device according to claim 1, wherein the direction of the wire is bent at a portion wound around the pin. 4. The deflecting device according to claim 1, wherein the pin is formed integrally with the bobbin. 5. The deflecting device according to claim 4, wherein when the pin is formed by integral molding, a closing member for closing a recess formed in the bobbin is provided due to a structure of a molding die. 6. The pin is formed as a separate component from the bobbin, the bobbin has a press-fit hole for press-fitting a base end of the pin, and the pin has a base end fitted to the press-fit hole of the bobbin. The deflecting device according to claim 1, wherein the deflecting device is fixed to the bobbin by press-fitting. 7. The deflecting device according to claim 6, wherein a base end portion of the pin is melted and fixed to a bobbin after being pressed into the press-fit hole. 8. The deflecting device according to claim 7, wherein the melting is performed by ultrasonic waves. 9. The bobbin is formed in a tubular shape corresponding to the outer peripheral shape of a cathode ray tube, a horizontal deflection coil is disposed on an inner peripheral portion of the bobbin, and a vertical deflection coil is disposed on an outer peripheral portion of the bobbin. 2. The deflecting device according to claim 1, wherein the pin is projected from an inner peripheral portion of the bobbin to wind a wire of the horizontal deflection coil. 10. The pin according to claim 1, wherein the pin has a claw at a tip end for preventing the wire from coming off.
The deflecting device according to claim 1. 11. The deflecting device according to claim 1, wherein the pin has a thickness of at least 1 mm or more.