JPH0622103B2 - Deflection-yoke device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an improvement in a deflection yoke device mounted on a cathode ray tube such as a television receiver and a CRT display device.

<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 coil of 15.75 KHz or more to 120 KHz or more is used. A vertical deflection current of about 60 Hz is supplied to the vertical deflection coil, and the electron beam is deflected by a predetermined amount by using the horizontal deflection magnetic field and the vertical deflection magnetic field generated from each deflection coil. An image is obtained. In this case, both the horizontal deflection magnetic field and the vertical deflection magnetic field generate a leakage magnetic field to the outside of the deflection yoke (core). 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 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 deflection yoke including a core, a pair of hull-shaped horizontal deflection coils wound along the inner surface of the core, and a toroidal or hull-shaped vertical deflection coil arranged outside the horizontal deflection coil; A pair of canceling coils are connected in series to the deflection coil, the canceling coil is wound in a loop and is arranged outside the core away from the core and the vertical deflection coil. The cancel coil is positioned on or near the Y-axis and is arranged orthogonally to the Y-axis, and a magnetic field reverse to the magnetic field leaking to the outside of the core from the horizontal deflection magnetic field generated by the horizontal deflection coil is generated by the cancel coil. It is generated.

<Operation> A horizontal deflection current is applied to a pair of cancel coils to generate a canceling magnetic field with a horizontal deflection period.

Further, since the cancel coil is arranged apart from the core and the vertical deflection coil in the Y-axis direction of the deflection yoke and at the position of the Y-axis, the cancel magnetic field is not only the leakage magnetic field from the core but also the core. The radiated magnetic field from the horizontal deflection coil portion outside is reduced, the number of windings of the cancel coil is reduced, and the cancel coil is easily attached to and electrically insulated from the deflection yoke.

<Example> Hereinafter, an example of the deflection yoke device of the present invention will be described in detail with reference to the drawings. 1 to 3, reference numeral 1 denotes an annular core formed by joining a pair of semi-annular cores. The core 1 has a pair of paddle-shaped horizontal deflection coils 2 and 3 on the inner surface thereof.
And a pair of toroidal vertical deflection coils 4 and 5 are wound around the outer circumference. Reference numeral 6 denotes a coil bobbin arranged on the inner surface of the core 1 for maintaining 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. 4, 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 body 7 in series with the horizontal deflection coils 2 and 3. Cancel coil 8,
Reference numeral 9 is composed of, for example, a vinyl-coated lead wire, an enamel wire, or a printed wiring board whose outer circumference is covered with an insulating material. Further, as shown in FIGS. 1 and 2, the casel coils 8 and 9 are separated from the outer surfaces of the core 1 and the vertical deflection coils 4 and 5, and their centers 8T and 9T are deflected by a deflection yoke (deflection yoke). Body 7)
Is formed on the Y-axis (on the vertical axis) in a rectangular loop shape, and is wound and arranged orthogonally to the Y-axis. It is attached and fixed to the deflection yoke main body 7 in a state of being engaged (fitted) with the stopper 10. Then, the cancel coils 8 and 9 cause a magnetic field (cancellation magnetic field) opposite to the magnetic field (unwanted radiation) leaking to the outside of the core 1 forming part of the deflection yoke main body 7 in the horizontal deflection magnetic fields generated by the horizontal deflection coils 2 and 3. ) Is generated on both side portions 8E, 8F, 9E, 9F of the cancel coils 8, 9. Here, in the present embodiment, the cancel coils 8 and 9 are formed by winding vinyl-coated lead wires using 5 turns (only 3 turns are shown in the drawing for simplification).
The number of turns of the cancel coils 8 and 9 can be appropriately increased or decreased depending on the degree of unnecessary radiation or the relationship with the impedance of the horizontal deflection coil.

In the deflection yoke device having such a configuration, outside the core 1, the centers 8T and 9T are formed on the Y axis of the deflection yoke so as to form a loop, and are wound at positions orthogonal to the Y axis. Predetermined wiring connection is performed in a state where the cancel coils 8 and 9 arranged once are separated from the core 1 and the vertical deflection coil 4 and fixedly attached to the deflection yoke body 7. After that, predetermined currents are applied to the horizontal deflection coils 2 and 3, the vertical deflection coils 4 and 5, and the cancel coils 8 and 9, respectively. As shown in FIG. 5, the horizontal deflection magnetic field H _B generated by the horizontal deflection coils 2 and 3 as the current is applied, leaks to the outside of the core 1 (deflection yoke body 7), that is, unnecessary radiation H _R
On the other hand, the canceling magnetic field H _C generated by the canceling coils 8 and 9 which are formed outside the core 1 and which are formed in a loop shape, causes the canceling magnetic fields H _{C to} occur on both sides (8E and 8E) of the canceling coils 8 and 9.
F, 9E, 9F) side has a reverse magnetic field, and as a result,
The unnecessary radiation H _R is canceled by the canceling magnetic field H _{C and} is reliably reduced.

In the embodiment of the deflection yoke device of the present invention, the vertical deflection coil is wound around the core in a toroidal shape, but the vertical deflection coil is wound around the core in a square shape. It is also good. In one embodiment of the deflection yoke device of the present invention, as shown in FIG. 1, the cancel coil is attached and fixed so as to be separated from the toroidal type vertical deflection coil along the tube outer surface substantially along the outer surface of the core. As described above, as shown in FIG. 6, the cancel coils 8 and 9 may be attached and fixed in parallel to the tube axis via the locking portion 10. In this case, the cancel coils 8 and 9 are The attachment and fixing to the coil bobbin 6 is simplified. Further, as shown in FIG. 7, the cancel coils 8 and 9 may be formed in an arc shape along the outer surface of the core 1. In this case, the cancel coils are efficiently arranged with respect to unnecessary radiation. Furthermore, the shape of the cancel coils 8 and 9 is not limited to the rectangular shape of the embodiment. For example, as shown in FIG. 8, even if the cancel coil 8 (9) is formed in a substantially trapezoidal shape in a loop shape, Alternatively, although not shown, it may be formed in a loop shape as a circular shape or an oval shape, and is formed outside the core 1 to form a loop shape, and is wound in a shape orthogonal to the Y axis. It can be appropriately changed as long as it is arranged. Further, in the embodiment of the present invention, the center of the cancel coil is located on the Y-axis and is formed in a loop, but the Y-axis can be used as long as it effectively acts on unwanted radiation. The present invention is not limited to the above, and the center may be located in the vicinity of the Y axis to form a loop. Further, in one embodiment of the deflection yoke device of the present invention, the cancel coil is constituted by using the vinyl coated lead wire, but as described above, the enamel wire or the printed wiring board may be used.

<Effects of the Invention> The deflection yoke device of the present invention is as described in detail above, and produces the following effects. (B) Since a horizontal deflection current is passed through the cancel coil, it is possible to generate a cancellation magnetic field with its own magnetic field strength without being influenced by the strength of the leakage magnetic field of the horizontal deflection period that leaks to the outside of the core. It is possible to surely reduce not only the leakage magnetic field from the core but also the magnetic field emitted from the horizontal deflection coil portion outside the core. As a result, the unwanted radiation is reliably reduced and the screen characteristics (landing, convergence,
It does not adversely affect the deflection distortion) and eliminates the risk of causing malfunction in other models (computer terminal devices, etc.) close to the deflection yoke, and disturbance of the video signal. (B) Since the cancel coil is arranged in the Y-axis direction of the deflection yoke away from the core and the vertical deflection coil at a position where the magnetic field strength of the magnetic field leaking to the outside of the core is slightly weakened, the number of turns of the cancel coil may be small. ,
Further, since the coil itself can be configured to be lightweight, it becomes easy to hold the cancel coil.

Further, since the cancel coil is arranged in the Y-axis portion of the deflection yoke, the cancel coil can be arranged at the position where the leakage magnetic field of the horizontal deflection period is the largest, and the leakage magnetic field of the horizontal deflection period radiated from the deflection yoke can be efficiently reduced. be able to.

(C) The cancel coil can be separately formed separately from the deflection yoke body, and if the deflection coil body is attached and fixed (installed) in a loop shape, it can be directly locked and fixed. Good and extremely easy, productivity and workability are remarkably improved, and mass productivity is high.
As described above, the deflection yoke device of the present invention has various effects, and will be more and more effective in the future especially 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 line II-II of FIG. 1, and FIG. 3 is a schematic top view of an essential part of the embodiment of the deflection yoke device of the present invention. FIG. 4 and FIG. 4 are circuit diagrams showing a connection state of the horizontal deflection coil and the cancel coil, and FIG. 5 shows a state of a magnetic field generated by the horizontal deflection coil and the cancel coil as seen from the head side of the deflection yoke body. And FIG. 6 is a schematic side view of another embodiment of the deflection yoke device of the present invention.
FIG. 8 is a sectional view of an essential part of the still another embodiment, and FIG. 8 is an upper surface (lower surface) view of the still another embodiment. 1 ... Core, 2, 3 ... Horizontal deflection coil, 4, 5 ... Vertical deflection coil, 8, 9 ... Cancellation coil,

Claims (1)

[Claims] 1. A core, a pair of saddle-shaped horizontal deflection coils wound along the inner surface of the core, and a toroidal or saddle-shaped vertical deflection coil arranged outside the horizontal deflection coil. A deflection yoke is provided, and a pair of cancel coils are connected in series to the horizontal deflection coil, and the cancel coils are wound in a loop shape and arranged outside the core and apart from the core and the vertical deflection coil. The center of the horizontal deflection magnetic field is located on or near the Y-axis of the deflection yoke and is orthogonal to the Y-axis, and the horizontal deflection magnetic field generated by the horizontal deflection coil is A deflection yoke device, wherein a magnetic field reverse to a magnetic field leaking to the outside of the core is generated from the cancel coil.