JPH0646546B2 - Deflection-yoke device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an improvement of a deflection yoke device mounted on a cathode ray tube of a television receiver, a CRT display device or the like.

<Prior Art> As is well known, in a deflection yoke mounted on a cathode ray tube of a television receiver, a CRT display device or the like, normally, a horizontal deflection current of 15.75 KHz is supplied to a horizontal deflection coil to vertically A vertical deflection current of 60 Hz is supplied to the deflection coils, a horizontal deflection magnetic field and a vertical deflection magnetic field generated from each deflection coil are used to deflect the electron beam by a predetermined amount, and a desired image is obtained on the screen. In this case, both the horizontal deflection magnetic field and the vertical deflection magnetic field generate a leakage magnetic field outside the deflection yoke. The presence of this external leakage magnetic field does not have a great influence on the characteristics of the deflection yoke,
Further, since the deflection yoke itself is a device (component) that is formed by utilizing the leakage magnetic field from the deflection coil, until recently, no measures have been taken to reduce the external leakage magnetic field by the deflection yoke itself. It was a thing.

On the other hand, recently, the diversification of video equipment such as arranging a high-frequency compatible terminal device such as a computer near a cathode ray tube equipped with a deflection yoke has led to an external deflection yoke which has not been a particular problem. Out of the leakage magnetic field, there is a concern that the external leakage magnetic field of the horizontal deflection magnetic field having a high frequency becomes unnecessary radiation, which may adversely affect other models such as terminal devices and cause adverse effects. There has been a demand for reducing unnecessary radiation.

In the conventional deflection yoke, the basic principle of the deflection yoke,
That is, from the viewpoint that the deflection yoke deflects the electron beam by a predetermined amount by utilizing the leakage magnetic field from the deflection coil, a magnetic shield plate is provided so as to surround the outer periphery of the deflection yoke in a small portion of the deflection yoke. The deflection yoke itself is not provided with any means for reducing the unwanted radiation, except for the one in which the unwanted radiation is reduced by the magnetic shield plate.

<Problems to be Solved by the Invention> However, in the conventional shield yoke that surrounds the outer circumference of the deflection yoke, there is a problem that the shield plate is large in shape, and the shield plate is characteristically unnecessary radiation. There is a problem that another deflection magnetic field is formed in response to the (external leakage magnetic field), and the screen characteristics (landing, convergence, deflection distortion) are adversely affected. On the other hand, in the case of a deflection yoke that does not have any means for reducing unnecessary radiation, as described above, other models that are close to the deflection yoke, especially those that support high frequencies, may malfunction, or the video signal may be disturbed and the normal operation may occur. There is a problem that adverse image effects such as lack of excellent image characteristics are exerted.

<Means for Solving the Problems> The deflection yoke device of the present invention solves the above problems by
A core, a pair of paddle-shaped horizontal deflection coils wound along the inner surface of the core, a pair of toroidal vertical deflection coils wound around the outer periphery of the core, and a horizontal deflection coil arranged on the inner surface of the core The deflection yoke body is composed of a coil bobbin that maintains insulation between the vertical deflection coils, and the horizontal deflection magnetic field generated by the horizontal deflection coil in series with the horizontal deflection coil of the deflection yoke body and the magnetic field opposite to the horizontal deflection magnetic field leaking from the deflection yoke body to the outside A pair of canceling coils that generate the above are connected, and the canceling coil is wound around the core in a toroidal shape.

<Operation> A pair of cancel coils are wound around a core in a toroidal shape. The unwanted radiation of the horizontal deflection magnetic field, which is generated by the horizontal deflection coil and leaks from the deflection yoke body to the outside, is the opposite of the unwanted radiation produced by the cancel coil. The canceling magnetic field can be used to reduce a predetermined amount.

<Example> Hereinafter, an example of the deflection yoke device of the present invention will be described in detail with reference to the drawings. In FIG. 1 and FIG. 2, reference numeral 1 is an annular core formed by joining a pair of semi-annular cores.
A pair of paddle-shaped horizontal deflection coils 2 and 3 are wound on the inner surface, and a pair of toroidal vertical deflection coils 4 and 5 are wound on the outer circumference. Reference numeral 6 denotes a coil bobbin which is arranged on the inner surface of the core 1 and maintains insulation between the horizontal deflection coils 2 and 3 and the vertical deflection coils 4 and 5, and includes the core 1, the horizontal deflection coils 2 and 3, the vertical deflection coils 4 and 5, and the coil bobbin. The deflection yoke body 7 is constituted by 6. As shown in FIG. 3, a pair of cancel coils 8 and 9 are connected to the horizontal deflection coils 2 and 3 forming a part of the deflection yoke main body 7 in series with the horizontal deflection coils 2 and 3. Cancel coil 8,
Reference numeral 9 is for generating a magnetic field reverse to the horizontal deflection magnetic field leaking from the deflection yoke main body 7 generated by the horizontal deflection coils 2 and 3, and the horizontal deflection coils 4 and 5 of the core 1 are not wound and are approximately 180 °. A non-wound portion that is diagonally located apart from each other, specifically, a toroidal winding is provided on the outer periphery of the core 1 in the vicinity of the joining portion 1a via the auxiliary bobbin 10 that surrounds the outer periphery of the core 1. Is. In this embodiment, the canceling coils 8 and 9 are formed by twisting five 0.4.phi. Copper wires, or by bundling them without twisting them and using them for five turns. It is a thing.

In the deflection yoke device having such a configuration, the horizontal deflection coils 2 and 3, the vertical deflection coils 4 and 6, the cancel coil 8,
A predetermined current is applied to each of the nine. At this time, as shown in FIG. 4, of the horizontal deflection magnetic field H _B generated by the horizontal deflection coils 2 and 3, unnecessary radiation H _R leaking from the deflection yoke body 7 to the outside is passed through the auxiliary bobbin 10. The canceling magnetic field Hc generated by the canceling coils 8 and 9 wound toroidally around the non-winding portions of the vertical deflection coils 4 and 5 of the core 1 becomes a magnetic field in the opposite direction, and the unwanted radiation H
_{A part of R} is canceled by the canceling magnetic field Hc and reduced.

In one embodiment of the deflection yoke device of the present invention, the cancel coil is wound around the non-wound portion of the vertical deflection coil of the core via the auxiliary bobbin in a toroidal manner. It is possible to change the winding position of the cancel coil according to the above, and the cancel coil may be wound around the winding portion of the vertical deflection coil in a toroidal shape. Further, the cancel coil itself may be provided with an insulating means (insulating tube or the like), and the cancel coil may be directly wound around the core in a toroidal shape without using the auxiliary bobbin. In the embodiment of the deflection yoke main body of the present invention, a pair of semi-annular cores are joined to form an annular core, but a core previously configured in an annular shape may be used. Of course. Further, in the present embodiment, as the canceling coil, the one in which five 0.4.phi. Copper wires are twisted or bundled in the bifilar is used for five turns, but the wire diameter of the copper wire, The number of wires, the number of turns, etc. are not limited to those in the embodiment, and can be appropriately changed or increased / decreased depending on the relationship with the impedance of the horizontal deflection coil. When using a copper wire having a large wire diameter, for example, 0.5φ to 1.0φ, a plurality of wires Instead of twisting or bundling, the toroidal shape may be formed by simply using a few turns.

<Effects of the Invention> The deflection yoke device of the present invention is as described in detail above, and produces the following effects. In other words, the magnetic field generated by the cancel coil wound in a toroidal shape on the core (cancellation magnetic field) forms a magnetic field opposite to the horizontal deflection magnetic field (unwanted radiation) leaking from the deflection yoke body to the outside. Unnecessary radiation of the horizontal deflection magnetic field is reliably reduced without adversely affecting the characteristics (landing, convergence, deflection distortion), causing malfunction in other models (computer terminal device, etc.) close to the deflection yoke, and This eliminates the concern that signal disturbance will occur. Next, by constructing as in the embodiment, it is extremely simple to wind the cancel coil around the non-wound portion of the vertical deflection coil of the core in a toroidal shape,
With a compact structure, unnecessary radiation is reduced and productivity,
It is also advantageous in terms of cost. Furthermore, the winding length of the cancel coil with respect to the deflection yoke body is the shortest due to the use of the core, the toroidal winding around the core, and the non-wound portion of the vertical deflection coil of the core, In addition, the winding efficiency is improved by closely winding the core, and the power loss of the deflection yoke body can be suppressed as much as possible. Furthermore, the winding of the cancel coil around the core does not affect or influence the winding of other components, especially the vertical deflection coil, and the insulation between the vertical deflection coil and the cancel coil is also assisted. This is surely performed by using a bobbin, an insulating means, etc., which is advantageous in terms of shape and electricity. And, a cancel coil for reducing unnecessary radiation is wound around the non-wound portion of the vertical deflection coil of the core of the deflection yoke, which has not been considered at all in the past, and the application range of the deflection yoke itself is increased. ,In particular,
It will become more and more effective for high-frequency compatible video equipment.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of the deflection yoke device of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 is a circuit showing a connection state of a horizontal deflection coil and a cancel coil. FIG. 4 and FIG. 4 are explanatory views showing the states of the magnetic fields 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, 7 ... Deflection yoke body, 8,
9 ... Cancel coil,

Claims (1)

[Claims] 1. A core, a pair of paddle-shaped horizontal deflection coils wound along the inner surface of the core, a pair of toroidal vertical deflection coils wound around the outer periphery of the core, and the core. And a coil bobbin for maintaining insulation between the horizontal deflection coil and the vertical deflection coil disposed on the inner surface of the deflection yoke body, and a deflection generated by the horizontal deflection coil in series with the horizontal deflection coil of the deflection yoke body. A deflection yoke device comprising: a pair of cancel coils that generate a magnetic field reverse to a horizontal deflection magnetic field leaking from the yoke body to the outside, and the cancel coils are wound around the core in a toroidal shape.