JPH0563892B2 - - 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 ground equipment such as terminal equipment. 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 was not possible to obtain the desired results, and that it had other negative effects.

<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. Consisting of a rear annular part and a pair of diagonally located connecting parts that connect both annular parts,
In addition to installing auxiliary bobbins each having a groove, a pair of cancel coils that generate a magnetic field opposite to the horizontal deflection magnetic field leaking to the outside from the deflection yoke body generated by the horizontal deflection coil are installed in the grooves of the auxiliary bobbin. The deflection yoke is inserted into the deflection yoke body, formed into a substantially hollow shape, and fixedly attached to the deflection yoke main body.

<Function> Using an auxiliary bobbin with a pair of cancel coils attached to the coil bobbin, insert it into the groove of the auxiliary bobbin to remove the vicinity of the enlarged front end portion of the coil bobbin, the outer circumferential surface and back surface of the enlarged rear end portion, and the deflection yoke main body. It is located externally and is formed into a roughly hollow shape and is fixed to the deflection yoke body.It is used to eliminate unnecessary radiation of the horizontal deflection magnetic field that leaks from the deflection yoke body to the outside, which is generated by the horizontal deflection coil, to the cancel coil. The unnecessary radiation thus generated can be reduced by a predetermined amount by using a cancel magnetic field opposite to the unnecessary radiation.

<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.
It is attached and fixed to the auxiliary bobbin 10 via the auxiliary bobbin 10.
As shown in FIG. 4, the auxiliary bobbin 10 includes a front annular portion 10a disposed along the outer peripheral surface 6a1 of the enlarged front end portion 6a of the coil bobbin 6, which forms a part of the deflection yoke main body 7, and a rear annular portion 10a of the coil bobbin 6. End enlarged part 6
a rear annular portion 10b disposed along the outer circumferential surface 6b1 and rear surface 6b2 of b, and a front annular portion 10a and a rear annular portion 10b disposed outside the deflection yoke main body 7, that is, on the outside of the core 1. A pair of connecting parts 10c and 10d located diagonally to connect the
It is attached and fixed to the coil bobbin 6 by appropriate means such as engagement or adhesion. Front annular portion 10a and rear annular portion 10b of the auxiliary bobbin 10
Grooves 11 each having a substantially U-shaped cross section are formed continuously toward the outer periphery in the front annular portion 10a and continuously toward the rear, sideways, outer periphery, sides, and rear in the rear annular portion 10b. , connecting portions 10c, 10
A groove portion 12 having a substantially Y-shaped cross section is formed in each portion d toward the outside. The cancel coils 8 and 9 are connected to the grooves 11 and 9 of the auxiliary bobbin 10, respectively.
The front end enlarged portion 6 of the coil bobbin 6 is inserted into the coil bobbin 12 and corresponds to the winding position of the horizontal deflection coils 2 and 3.
In the front end crossover wires 2a, 3a of the horizontal deflection coils 2, 3 housed in the front annular portion 10a,
The core 1 (deflection yoke main body 7) is connected using connecting parts 10c and 10d located at the outer periphery of the front end crossover wires 2a and 3a, and in the middle part (not shown) of the horizontal deflection coils 2 and 3. In the rear end connecting wires 2b, 3b of the horizontal deflection coils 2, 3 located on the outside and stored in the rear end enlarged portion 6b of the coil bobbin 6, the rear end connecting wires 2b, 3b are connected using the rear annular portion 10b. It is located on the outer periphery and rear surface of the portion, and is fixedly attached to the deflection yoke main body 7 in a state where it is finally formed into a substantially hollow shape. In this embodiment, the cancel coils 8 and 9 are constructed using five turns of five twisted 0.4φ copper wires. Alternatively, as the cancel coils 8 and 9, the coils may be formed in advance into a substantially hollow shape and then inserted into the grooves 11 and 12 formed in the auxiliary bobbin 10 and fixed thereon. Groove 1 of auxiliary bobbin 10
The coils may be directly wound around the auxiliary bobbin 10 using the cancel coils 8 and 12 to form a substantially hollow shape, and the method of winding the cancel coils 8 and 9 around the auxiliary bobbin 10 can be arbitrarily selected.

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 .
A cancel magnetic field H _C is generated by cancel coils 8 and 9 which are formed in a substantially saddle shape and are fixedly attached to the horizontal deflection coils 2 and 3 through an auxiliary bobbin 10 to the H _R. becomes a magnetic field in the opposite direction, and part of the unnecessary radiation H _R is canceled out and reduced by the cancel magnetic field H _C. That is, as shown in FIG. 6, the center point of the horizontal deflection coils 2 and 3,
In other words, the antenna AT is installed at a predetermined distance L (usually 3 m) from the center point 0 of the deflection yoke body 7.
Unnecessary radiation (H _R ) of the horizontal deflection magnetic field (H _B ) applied to
is without the cancel coils 8 and 9 installed.
By providing cancel coils 8 and 9 and applying a cancel magnetic field (H _C ), the 28 dB is reduced to 20 dB by about 30%. 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 composed of a coil bobbin that maintains insulation between a deflection coil and a vertical deflection coil, and a front annular portion, a rear annular portion, and a diagonal shape connecting both annular portions are connected to the coil bobbin of the deflection yoke body. The auxiliary bobbin has a groove formed therein, and generates 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. A deflection yoke device characterized in that a pair of cancel coils are respectively inserted into grooves of the auxiliary bobbin to form a substantially hollow shape and are fixedly attached to the deflection yoke main body. 2. The front annular portion of the auxiliary bobbin is arranged along the outer circumferential surface of the enlarged front end portion of the coil bobbin, the rear annular portion is arranged along the outer circumferential surface and the back surface of the enlarged rear end portion of the coil bobbin, and the connecting portion is arranged. 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 annular portion of the auxiliary bobbin is arranged along the back surface of the enlarged front end portion of the coil bobbin, the rear annular portion is arranged along the outer peripheral surface and the back surface of the enlarged rear end portion of the coil bobbin, and the connecting portion is arranged along the rear surface of the enlarged rear end portion of the coil bobbin. The deflection yoke device according to claim 1, wherein the deflection yoke device is located outside the deflection yoke main body.