JPH0455401Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The invention can be used, for example, in television receivers, CRTs, etc.
The present invention relates to a deflection yoke device mounted on a cathode ray tube such as a display device.

[Prior art]

In general, a deflection yoke device is of a type in which a saddle-shaped horizontal deflection coil is provided on the inner surface of the core via a coil bobbin, and a toroidal-type vertical deflection coil is provided that is wound around the core in a toroidal shape.
Some types are known in which a saddle-shaped horizontal deflection coil and a saddle-shaped vertical deflection coil are provided on the inner surface of the core via a coil bobbin. A vertical deflection coil is provided to generate a horizontal deflection magnetic field and a vertical deflection magnetic field in orthogonal directions.

and typically 15.75K for horizontal deflection coils
Supplies horizontal deflection current above Hz up to about 120KHz,
A vertical deflection current of approximately 60 Hz is supplied to the vertical deflection coils, and the horizontal and vertical deflection magnetic fields generated by each deflection coil are used to deflect the electron beam by a predetermined amount to obtain the desired image on the screen. In this case, both the horizontal deflection magnetic field and the vertical deflection magnetic field produce leakage magnetic fields to the outside of the deflection yoke. The presence of this external leakage magnetic field does not have a large effect on the characteristics of the deflection yoke, and since the deflection yoke itself is a device (component) that utilizes the leakage magnetic field from the deflection coil,
Until recently, no measures have been taken to reduce external leakage magnetic fields using the deflection yoke itself.

In recent years, however, video equipment has become more diverse, with computers and other high-frequency terminal equipment being placed close to cathode ray tubes equipped with deflection yokes. Among the leakage magnetic fields, there is a concern that the external leakage magnetic field of the high-frequency horizontal deflection magnetic field becomes unnecessary radiation and has an adverse effect such as causing malfunctions in other devices such as terminal devices. There has been a growing demand for reducing unnecessary radiation.

In conventional deflection yokes, from the viewpoint of the basic principle of the deflection yoke, that is, the deflection yoke uses the leakage magnetic field from the deflection coil to deflect the electron beam by a predetermined amount. The deflection yoke itself was not provided with any means for reducing unnecessary radiation, except for one in which a magnetic shield plate was provided to surround the outer periphery of the yoke, and the unnecessary radiation was reduced by the magnetic shield plate.

[Problem that the invention attempts to solve]

However, in the case of a conventional deflection yoke in which a shield plate is provided to surround the outer periphery, there is a problem that the shield plate is large in size, and the shield plate is characteristically subject to unnecessary radiation (external leakage magnetic field). Forms a deflection magnetic field and improves screen characteristics (landing,
There was a problem in that it had an adverse effect on convergence and deflection distortion. On the other hand, with a deflection yoke that does not have any means for reducing unnecessary radiation, as mentioned above, other models that are close to the deflection yoke, especially those compatible with high frequencies, may malfunction or may cause disturbances in the video signal, causing normal operation. image characteristics cannot be obtained.
There were problems such as negative effects.

The present invention was developed in view of the problems of the conventional technology, and aims to reduce unnecessary radiation by generating a magnetic field opposite to the horizontal deflection magnetic field that leaks to the outside as unnecessary radiation as a cancel magnetic field.
To provide a deflection yoke device which can maximize measures against unnecessary radiation by supporting an auxiliary bobbin for guiding a cancel coil that generates a cancel magnetic field on a coil bobbin in a rotationally restricted state.

[Means for solving problems]

In order to solve the above problems, the present invention includes a core, a pair of saddle-shaped horizontal deflection coils provided along the core, a pair of saddle-shaped or toroidal vertical deflection coils, and a pair of saddle-shaped or toroidal vertical deflection coils provided along the core. In a deflection yoke device, the deflection yoke device includes a circumferential trunk portion, an enlarged front end portion, and an enlarged rear end portion, and a coil bobbin provided on the horizontal deflection coil and the vertical deflection coil. an auxiliary bobbin having a front annular part and a rear annular part each extending along the outer periphery of the enlarged part, and a pair of connecting parts located outside the core to connect the front annular part and the rear annular part; A pair of cancel coils formed in a saddle shape and guided by the front annular part, the rear annular part, and the connecting part of the auxiliary bobbin, and the enlargement of at least one of the enlarged front end part and the enlarged rear end part of the coil bobbin. and a rotation restricting means for preventing rotation of the auxiliary bobbin formed in at least one of the front annular part and the rear annular part of the auxiliary bobbin.

[Effect]

Since a pair of cancel coils are provided on the auxiliary bobbin, this unnecessary radiation can be reduced by generating a cancel magnetic field in the opposite direction to the unnecessary radiation caused by the horizontal deflection magnetic field leaking to the outside of each cancel coil. , and because the position of the auxiliary bobbin is regulated in the rotational direction relative to the coil bobbin, it is possible to prevent the auxiliary bobbin from inadvertently moving slightly or rotating relative to the coil bobbin.
In addition to improving image quality, it is possible to eliminate accidents.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, taking as an example a case where the horizontal deflection coil is a saddle-shaped deflection coil and the vertical deflection coil is a toroidal deflection coil.

In the drawings, reference numeral 1 denotes a core formed by joining a pair of semi-annular core members, and a pair of saddle-shaped horizontal deflection coils 2 and 3 are arranged along the front-rear direction on the inner surface of the core 1. Toroidal vertical deflection coils 4 and 5 are wound around the core 1 along the front-rear direction.

A coil bobbin 6 is disposed on the inner circumferential side of the core 1 and is formed by abutting two bobbin halves made of an insulating resin material.The coil bobbin 6 holds the horizontal deflection coils 2 and 3, and Insulation between the horizontal deflection coils 2 and 3 and the vertical deflection coils 4 and 5 is ensured. Here, the coil bobbin 6 includes a morning glory-shaped circumferential body portion 6A in which the intermediate portions 2A and 3A of the horizontal deflection coils 2 and 3 are disposed, and the horizontal deflection coil 2,
3, and a rear end enlarged part 6C where the rear end connecting wire parts 2C, 3C of the horizontal deflection coils 2, 3 are located.

Reference numeral 7 denotes an auxiliary bobbin made of a flexible resin material and installed on the coil bobbin 6 outside the core 1 and the vertical deflection coils 4 and 5. The front annular portion 7A to which the surfaces are fitted, and the coil bobbin 6
While being fitted into the outer peripheral surface of the rear end enlarged portion 6C,
A substantially hexagonal rear annular portion 7B partially abuts the back surface, and ribs 7C 1 and 7D located on a horizontal plane and extending in the front-rear direction to connect the front annular portion _7A and the rear annular portion 7B. ₁ (however, the rib 7D ₁ is not shown) is formed from left and right connecting portions 7C and 7D.

Reference numerals 8 and 9 denote a pair of winding grooves formed on the upper and lower sides of the auxiliary bobbin 7, and each of the winding grooves 8 and 9 connects the connecting portion 7C,
It is defined into an upper winding groove 8 and a lower winding groove 9 with ribs 7C ₁ and 7D ₁ formed on the outer peripheral surface of 7D sandwiched therebetween. The upper winding groove 8 includes the front annular portion 7A, the rear annular portion 7B, the ribs 7C ₁ of the connecting portions 7C and 7D,
Grooves 8A, 8B, 8C, 8D above 7D ₁
The lower winding groove 9 is also defined as groove portions 9A, 9B, 9C, and 9D below these.

10 and 11 are respective winding grooves 8 of the auxiliary bobbin 7,
A pair of cancel coils 9 are wound and guided and formed in a saddle shape, each cancel coil 1
0 and 11 are connected in series to the horizontal deflection coils 2 and 3, and with a polarity that generates a magnetic field in the opposite direction to the direction of the magnetic field of unnecessary radiation leaking from the horizontal deflection magnetic field. Here, each cancel coil 1
For wires 0 and 11, a single copper wire is used, or a plurality of copper wires are twisted and wound. Incidentally, each of the cancel coils 10 and 11 may be formed into a hollow shape in advance and attached to each of the winding grooves 8 and 9.

Furthermore, 12, 12 are semicircular fitting grooves formed on the left and right outer peripheral surfaces of the front end enlarged portion 6B that constitutes the coil bobbin 6, and 13, 13 are the left side of the front annular portion 7A that constitutes the auxiliary bobbin 7. , a semicircular arc-shaped fitting protrusion formed on the right inner peripheral surface, and the fitting protrusion 13 fits into the fitting groove 12, thereby regulating the position of the auxiliary bobbin 7 in the rotational direction with respect to the coil bobbin 6. I'm going. Therefore, the fitting groove 1
2. The fitting protrusion 13 constitutes the rotation regulating means of this embodiment.

Although the present embodiment is configured as described above, the auxiliary bobbin 7 is formed by winding the cancel coils 10 and 11.
To fit the auxiliary bobbin 7 into the coil bobbin 6, insert the front annular part 7A of the auxiliary bobbin 7 from the rear end enlarged part 6C side of the coil bobbin 6 toward the front end enlarged part 6B, and insert the front annular part into the front end enlarged part 6B. 7A, and at the same time, the rear annular portion 7B may be fitted to the rear end enlarged portion 6C.

At this time, fitting grooves 12 are formed on the left and right outer peripheral surfaces of the front end enlarged portion 6B, and the front annular portion 7
Since fitting protrusions 13 are formed on the left and right inner peripheral surfaces of A, by fitting the fitting protrusions 13 into the fitting grooves 12, rotation of the auxiliary bobbin 7 relative to the coil bobbin 6 is prevented, and Position regulation in the rotational direction can be performed.

Next, the operation for reducing unnecessary radiation of the deflection yoke device in which the auxiliary bobbin 7 is assembled as described above will be described. That is, the horizontal deflection coil 2,
3. When a predetermined current is passed through the vertical deflection coils 4 and 5, the horizontal deflection coils 2 and 3 generate the shown deflection magnetic field H _B as shown in FIG. Form a magnetic path towards the direction. On the other hand, in the cancel coils 10 and 11, a clockwise cancel magnetic field Hc is generated in the winding portion on the left side in FIG.
In the right winding section, a counterclockwise canceling magnetic field is generated.
Hc occurs.

However, since a high-frequency horizontal deflection current is passed through the horizontal deflection coils 2 and 3, the high-frequency horizontal deflection magnetic field H _B tends to be generated outside the deflection yoke device as a leakage magnetic field as unnecessary radiation H _R. However, each cancel coil 10, 11 has the unnecessary radiation.
Since it is possible to generate a cancel magnetic field Hc in the opposite direction to H _R , the unnecessary radiation can be canceled and it can be reliably reduced.

In the embodiment, toroidal type vertical deflection coils are exemplified as the vertical deflection coils 4 and 5, but saddle type vertical deflection coils may also be used.Also, although the auxiliary bobbin 7 has been described as being integrally molded into an annular shape, It may be formed as a pair of semi-annular halves and these may be adhered or fitted together.

In addition, in the embodiment, a fitting groove 1 is provided on the coil bobbin 6 side.
2 and the fitting protrusion 13 is formed on the auxiliary bobbin 7, however, these relationships may be reversed. Furthermore, the fitting groove 12 and the fitting protrusion 13 are not limited to a semicircular arc shape, but can be formed into any suitable shape such as a quadrangular shape or a triangular shape, as long as the position in the rotational direction can be controlled by fitting the projections and the convexities.

Furthermore, in the embodiment, it has been described that the fitting groove 12 is formed in the front enlarged part 6B of the coil bobbin 6, and the fitting protrusion 13 is formed in the front annular part 7A of the auxiliary bobbin 7. Rotation regulating means may be formed in the enlarged rear end portion 6C and the rear annular portion 7B, respectively, to regulate the position of the auxiliary bobbin 7 in the rotational direction with respect to the coil bobbin 6 on the neck portion side of the deflection yoke device.

[Effect of idea]

The deflection yoke device according to the present invention is as described in detail above, and is provided with a pair of cancel coils on the auxiliary bobbin attached to the coil bobbin, and each cancel coil is provided with a pair of cancel coils to remove unnecessary radiation leaking outside from the horizontal deflection magnetic field. Since it is configured to form a cancel magnetic field in the opposite direction, unnecessary radiation can be reduced without adversely affecting the screen, and at least one of the enlarged front end and enlarged rear end of the coil bobbin and the front of the auxiliary bobbin can be used. At least one of the annular part and the rear annular part is provided with a rotation regulating means for preventing rotation of the auxiliary bobbin, so that the situation where the auxiliary bobbin moves inadvertently or rotates with respect to the coil bobbin can be avoided. This has the effect of preventing unnecessary radiation and maximizing the effect of reducing unnecessary radiation.

[Brief explanation of the drawing]

FIG. 1 is a front view of the deflection yoke device according to this embodiment, FIG. 2 is a right side view of FIG. 1, FIG. 3 is a front view of the coil bobbin, and FIG. 4 is a front view of the auxiliary bobbin.
FIG. 5 is an explanatory diagram showing the state of the magnetic field generated by the horizontal deflection coil and the cancel coil. 1...Core, 2, 3...Horizontal deflection coil, 4,
5... Vertical deflection coil, 6... Coil bobbin, 6
A...Circumferential body part, 6B...Front end enlarged part, 6C...Rear end enlarged part, 7...Auxiliary bobbin, 7A...Front annular part, 7B...Rear annular part, 7C, 7D...Connection part, 8 , 9... Winding groove, 10, 11... Cancel coil, 12... Fitting groove, 13... Fitting protrusion.

Claims (1)

[Scope of utility model registration request] It has a core, a pair of saddle-shaped horizontal deflection coils and a pair of saddle-shaped or toroidal-shaped vertical deflection coils provided along the core, and a circumferential body part disposed on the inner surface of the core, and a front end enlarged part and a rear end part. A deflection yoke device comprising a coil bobbin having an enlarged end portion and provided between the horizontal deflection coil and the vertical deflection coil, a front annular portion extending along the outer periphery of the enlarged front end portion and the enlarged rear end portion of the coil bobbin, respectively; an auxiliary bobbin having a rear annular part and a pair of connecting parts located outside the core and connecting the front annular part and the rear annular part; the front annular part, the rear annular part of the auxiliary bobbin; a pair of cancel coils guided by a connecting portion and formed in a saddle shape; a front end enlarged portion of the coil bobbin;
A rotation regulating means for preventing rotation of the auxiliary bobbin is formed on at least one of the rear end enlarged parts and at least one of the front annular part and the rear annular part of the auxiliary bobbin. A deflection yoke device characterized by: