JPH0563893B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to an improvement in 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 the deflection yoke mounted on the cathode ray tube of television receivers, CRT display devices, etc., the horizontal deflection coil is
A horizontal deflection current of 15.75KHz is supplied, a vertical deflection current of 60Hz is supplied to the vertical deflection coil, and the electron beam is deflected by a predetermined amount using the horizontal deflection magnetic field and vertical deflection magnetic field generated from each deflection coil. 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 existence 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, it has recently been Until now, no measures had been taken to reduce the external leakage magnetic field 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 that a magnetic shielding plate was provided to surround the outer periphery of the yoke, and unnecessary radiation was reduced by the magnetic shielding plate.

<Problems to be Solved by the Invention> 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 shape, and the shield plate is unnecessary due to its characteristics. (external leakage magnetic field) to form another deflection magnetic field, 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, it may cause malfunctions in other models near the deflection yoke, or it may cause disturbances in the video signal and disrupt normal image characteristics. There was a problem that it had negative effects such as not being able to obtain the desired results.

<Means for Solving the Problems> In order to solve the above problems, the deflection yoke device of the present invention includes a core, a pair of saddle-shaped horizontal deflection coils wound along the core, and a pair of toroidal-type or toroidal-type horizontal deflection coils. The deflection yoke body is composed of a saddle-shaped vertical deflection coil and a coil bobbin arranged on the inner surface of the core to maintain insulation between the horizontal deflection coil and the vertical deflection coil. and a pair of connecting parts located at both ends of each semi-annular part that connects the rear semi-annular part and both semi-annular parts, and a pair of semi-annular auxiliary bobbins each having a groove formed therein are used to connect the rear semi-annular part and both semi-annular parts through the connecting parts. At the same time, a pair of cancel coils that generate a magnetic field opposite to the horizontal deflection magnetic field leaked to the outside from the deflection yoke body generated by the horizontal deflection coil are attached to each semi-annular auxiliary bobbin. It is inserted into the groove of the horizontal deflection coil, formed into a substantially hollow shape corresponding to the winding position of the horizontal deflection coil, and fixedly attached to the deflection yoke main body.

<Operation> Using a pair of semi-annular auxiliary bobbins with a cancel coil attached to the coil bobbin, insert the cancel coil into the respective grooves of the semi-annular auxiliary bobbin, and attach the cancel coil to the outer surface (back surface or outer peripheral surface) of the enlarged front end portion of the coil bobbin. It is located between the front surfaces of the enlarged end portions, is formed into a roughly hollow shape that roughly corresponds to the winding position of the horizontal deflection coil, and is fixed to the deflection yoke body to prevent the deflection generated by the horizontal deflection coil. Unnecessary radiation of the horizontal deflection magnetic field leaking from the yoke body to the outside can be reduced by a predetermined amount using a cancel magnetic field that is opposite to the unnecessary radiation generated by the cancel coil.

<Example> Hereinafter, an example of the deflection yoke device of the present invention will be described in detail with reference to the drawings. In FIGS. 1 and 2, reference numeral 1 denotes an annular core. A pair of saddle-shaped horizontal deflection coils 2 and 3 are wound around the inner surface of the core 1, and a pair of toroidal-shaped vertical deflection coils are wound around the outer periphery. Coils 4 and 5 are wound. 6 is arranged on the inner surface of the core 1, and horizontal deflection coils 2 and 3 and vertical deflection coils 4 and 5 are arranged on the inner surface of the core 1.
It is a coil bobbin that maintains insulation between core 1, horizontal deflection coils 2 and 3, vertical deflection coil 4,
5. The coil bobbin 6 constitutes a deflection yoke main body 7. As shown in FIG. 3, a pair of cancel coils 8 and 9 are connected in series to the horizontal deflection coils 2 and 3 forming part of the deflection yoke body 7, as shown in FIG. The cancel coils 8 and 9 generate a magnetic field opposite to the horizontal deflection magnetic field leaked to the outside from the deflection yoke body 7 generated by the horizontal deflection coils 2 and 3.
The auxiliary bobbins 10 and 11 are fixed to each other via a pair of semicircular auxiliary bobbins 10 and 11. A pair of semicircular auxiliary bobbins 1
As shown in FIG.
front half annular parts 10a and 11a arranged along the back surface 6a1 of the coil bobbin 6; outside of,
That is, the front semi-annular parts 10a, 11a and the rear semi-annular parts 10b, 1 are arranged outside the core 1.
Each semi-annular part 10a, 10b, 11 connecting 1b
A pair of connecting portions 10c1, 10c2, 11c1, 11c2 provided at both end edges of a and 11b
With respect to the coil bobbin 6, the connecting parts 10c1 and 11c1, 10c2 and 11c2 are joined and fixed as a whole in an annular shape by means of adhesion, engagement, etc., and then the connecting parts 10c1 and 11c1, 10c2 and 11c2 are joined and fixed as a whole by means such as adhesion and engagement, and then the connection parts 10c1 and 11c1 and 10c2 and 11c2 are joined and fixed as a whole by means such as adhesion and engagement. It is installed and fixed by means of. Each of the semi-annular auxiliary bobbins 10 and 11 is provided with a groove 1 having a substantially U-shaped cross section and continuing outward toward the outer periphery.
2 and 13 are formed. The cancel coils 8 and 9 are connected to semicircular auxiliary bobbins 10 and 1, respectively.
Front end connecting wires 2a of the horizontal deflection coils 2 and 3 are inserted into the grooves 12 and 13 of the horizontal deflection coils 1 and housed in the front end enlarged portion 6a of the coil bobbin 6, approximately corresponding to the winding positions of the horizontal deflection coils 2 and 3. , 3a are located on the back side of the front end connecting wires 2a, 3a using the front semi-annular parts 10a, 11a, and in the middle part (not shown) of the horizontal deflection coils 2, 3, connecting parts 10c1, 10c2, 11c1, 11c2 are used to connect the horizontal deflection coils 2, 3 to the rear end connecting wires 2b, 3 located outside the core 1 (deflection yoke main body 7) and housed in the rear end enlarged portion 6b of the coil bobbin 6.
In the section b, the rear half-circular portions 10b and 11b are used to position the front side of the rear end connecting wires 2b and 3b, that is, between the back surface of the front end enlarged section 6a of the coil bobbin 6 and the front surface of the rear end enlarged section 6b. The deflection yoke body 7 is fixed to the deflection yoke main body 7 in a state where the deflection yoke body 7 is finally formed into a substantially hollow shape. Here, in this embodiment, the cancel coil 8,
9 is constructed using five turns of five twisted 0.4φ copper wires. In addition, as the cancel coils 8 and 9, the coils are formed into a substantially hollow shape in advance and are inserted and locked into the grooves 12 and 13 formed in the semi-annular auxiliary bobbins 10 and 11, respectively. Alternatively, the coils may be directly wound around each semi-annular auxiliary bobbin 10, 11 to form a substantially hollow shape.
The winding method for 11 can be selected arbitrarily.

In the deflection yoke device having such a configuration, a predetermined current is applied to the horizontal deflection coils 2 and 3, the vertical deflection coils 4 and 5, and the cancel coils 8 and 9, respectively. At this time, as shown in _FIG .
For H _R , a pair of semicircular auxiliary bobbins 10,1
1 to the front end connecting wire 2 of the horizontal deflection coils 2 and 3.
The cancel magnetic field Hc generated by the cancel coils 8 and 9, which are located between the portions a and 3a and the rear end connecting wires 2b and 3b and are fixed and formed in a substantially hollow shape, becomes a magnetic field in the opposite direction. Part of the unnecessary radiation H _R is canceled out and reduced by the cancel magnetic field Hc. That is, as shown in FIG. 6, the center point of the horizontal deflection coils 2 and 3, that is, the deflection yoke body
The unnecessary radiation (H _R ) of the horizontal deflection magnetic field (H _B ) applied to the antenna AT, which is installed at a predetermined distance L (usually 3 m) from the center point 0 of However, by providing cancel coils 8 and 9 and applying a cancel magnetic field (Hc), it is reduced by about 30% to 20 dB. Here, in Figure 5, ○†

Claims (1)

[Scope of Claims] 1. A core, a pair of saddle-shaped horizontal deflection coils wound along the core, a pair of toroidal or saddle-shaped vertical deflection coils, and a pair of horizontal deflection coils arranged on the inner surface of the core. A deflection yoke body is constituted by a coil bobbin that maintains insulation between a deflection coil and a vertical deflection coil, and a front half-annular portion, a rear half-annular portion, and both half-annular portions are connected to the coil bobbin of the deflection yoke body. A pair of semi-annular auxiliary bobbins, each of which has a groove formed therein, are connected and fixed in an annular manner via the connecting parts, and are attached to the horizontal Each of a pair of cancel coils that generate a magnetic field opposite to the horizontal deflection magnetic field leaked to the outside from the deflection yoke body generated by the deflection coil is inserted into the respective groove of each of the semi-annular auxiliary bobbins, and the horizontal deflection is A deflection yoke device characterized in that the deflection yoke device is formed into a substantially hollow shape corresponding to a coil winding device and is fixedly attached to the deflection yoke main body. 2 The front semi-annular portions of the pair of semi-annular auxiliary bobbins are arranged along the back surface of the enlarged front end portion of the coil bobbin, and the rear half annular portions are arranged along the front surface of the enlarged rear end portion of the coil bobbin, and the coupling is performed. 2. The deflection yoke device according to claim 1, wherein the deflection yoke device is located outside the deflection yoke main body. 3. The front semi-annular portions of the pair of semi-annular auxiliary bobbins are arranged along the outer peripheral surface of the enlarged front end portion of the coil bobbin, and the rear half annular portions are arranged along the front surface of the enlarged rear end portion of the coil bobbin, 2. The deflection yoke device according to claim 1, wherein the connecting portion is located outside the deflection yoke main body.