JPH03283238A - Deflection yoke device - Google Patents

Abstract

PURPOSE:To reduce the unnecessary magnetic field radiated from the front face of a screen by generating the magnetic field with the polarity opposite to that of the unnecessary magnetic field related to the horizontally deflected magnetic field generated by horizontally deflecting coils with a pair of auxiliary coils. CONSTITUTION:A pair of saddle-shaped vertically deflecting coils 2 and a pair of saddle-shaped horizontally deflecting coils 3$1, 32 are arranged in a core 1 connected with semi-circular ferromagnetic bodies (ferrite or the like), coil bobbins 4 molded with thermoplastic resin such as polypropylene for holding the insulation performance and for positioning the coils are provided between the deflecting coils, and they constitute a deflection yoke 5. An auxiliary coil 10 is constituted of windings 61, 62 wound with insulating resin-coated enamel copper wires on resin-molded auxiliary coil bobbins 11 and ferromagnetic cores 71, 72 inserted into the windings 61, 62 and shaped into nearly rectangular parallelepiped shapes to make the magnetic field generated by the windings 61, 62 effective.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a deflection yoke device that reduces harmful magnetic fields leaking to the outside from a deflection yoke for, for example, a CRT (cathode ray tube). An auxiliary coil connected directly to the horizontal deflection coil is provided on the Y-axis on the outer circumference of the deflection yoke, and the magnetic field generated by the coil is radiated to the outside of the deflection yoke by directing the magnetic field approximately in the Z-axis direction. This is a deflection yoke device that cancels harmful magnetic fields with magnetic fields radiated from auxiliary coils.

(Prior Art and Problems to be Solved by the Invention) As is well known, a CRT deflection yoke used in a television receiver or a display device for a computer terminal has a pair of horizontal deflection yokes for deflecting an electron beam in the horizontal direction. a pair of vertical deflection coils for deflecting in a vertical direction;
It consists of a coil bobbin to maintain the positioning and insulation performance of each coil, and an annular ferromagnetic core to strengthen the magnetic field effective for deflection.

And for the horizontal deflection coil and vertical deflection coil of the deflection yoke! An IA tooth wave current is supplied, which generates a deflection magnetic field and provides a desired image on the CRT.

In a deflection yoke with such a configuration, the magnetic field is emitted from the deflection coil to the outside and acts on the electron beam, so it can be used not only in necessary places but also in unnecessary places, such as outside of display devices and television receivers. In particular, the amount of horizontal deflection magnetic field with high frequency and large power is large.

In recent years, with the spread of computers and precision equipment,
There is a concern that this magnetic field may have an adverse effect on these devices and cause them to malfunction, and therefore there is a desire to reduce unnecessary magnetic fields.

In order to solve this problem, conventionally a magnetic plate for magnetic shielding has been attached to the outside of the deflection yoke, but not only is the reduction effect insufficient, but in the case of color CRTs, the convergence, utility, and deflection distortion characteristics are affected. have a negative impact.

In addition, recently, Japanese Patent Application Laid-open Nos. 62-93841 and 62-93841,
As proposed in No. 3-64250, auxiliary coils are arranged above and below the outer circumference of the deflection yoke, and the coils and the horizontal deflection coil are connected in series or parallel, and the magnetic field generated by the coils eliminates unnecessary There are methods such as canceling the magnetic field.

However, this method not only has the disadvantage that the auxiliary coil must be large in order to achieve a sufficient reduction effect, but also has the problem that it requires many man-hours for installation.

The present invention aims at achieving a sufficient reduction effect of unnecessary magnetic fields and at the same time reducing the size of the deflection yoke device.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a deflection yoke device having the following configuration.

A deflection yoke including a horizontal deflection coil, a vertical deflection coil, and a core, and a pair of auxiliary coils each housed in a pair of cases attached to the outside of the deflection yoke and connected to the horizontal deflection coil, A deflection yoke device characterized in that the pair of auxiliary coils generates a magnetic field having a polarity opposite to an unnecessary magnetic field related to the horizontal deflection magnetic field generated from the horizontal deflection coil.

(Example) An example of the deflection yoke device according to the present invention is shown in Figs.
This will be explained using figures. Fig. 1 is a side view of the first embodiment of the deflection yoke device according to the present invention, Fig. 2 is a perspective view of the auxiliary coil shown in Fig. 1, and Figs. 3 (a) and (b) are the horizontal deflection coil and FIG. 4, a connection diagram of the auxiliary coil, is an explanatory diagram showing the state of the magnetic field generated from the horizontal deflection coil and the auxiliary coil.

In Fig. 1, reference numeral 1.1 denotes a core made by bonding semi-annular ferromagnetic materials (ferrite, etc.), and a pair of vertical deflection coils 2, 2 shaped like a saddle are attached to the inner surface of the cores 1, 1. A pair of horizontal deflection coils 31 and 32 in the shape of a saddle are arranged, and between each deflection coil is a coil bobbin 4 made of thermoplastic resin such as polypropylene or Noryl for maintaining insulation performance and positioning the coils. These constitute the deflection yoke 5.

Reference numeral 10.10 represents a pair of auxiliary coils which form the main part of the present invention and generate a magnetic field (magnetic field φ shown in FIG. 4) for canceling an unnecessary magnetic field (magnetic field φlI shown in FIG. 4).

As shown in FIG. 2, the auxiliary coil 10 has a winding width of 6+, 62 obtained by winding a copper wire with an enamelled copper wire coated with an insulating resin or the like around a resin-molded auxiliary coil bobbin 11, and a winding width of 62. 6 (62), and this winding width 61 (62)
The magnetic field φ generated from In order to achieve this effect, it is composed of substantially rectangular parallelepiped ferromagnetic cores 71 and 72.

The auxiliary coil 10 is housed in a case 8 whose one end is locked by a locking pawl 91 and integrated with the other end of a terminal portion 8a for connection to the deflection coils 2, 31 and 32, respectively. Its stored state is the magnetic field φ generated by the auxiliary coil 10.10. is housed so that it is approximately in the Z-axis direction (the same direction as the direction in which the unnecessary magnetic field φ□ is generated, the direction in front of the left side of the horizontal deflection coils 31 and 32 in FIG. 1).

The direction of the horizontal deflection current flowing through each auxiliary coil 10 is as shown in FIG.

Furthermore, the other end of the case 8 is locked and fixed to a locking pawl 92 provided on the coil bobbin 4, and placed on the Y axis near the screen side, which is the outside of the deflection yoke 5 (as shown in FIG. 4, horizontally). Attached to the right rear of the deflection coils 31 and 32).

The attachment and fixing method of the auxiliary coil 10 and the case 8 will be explained in detail with reference to FIGS. 5 to 9 and 11. FIG. 5 is a perspective view of the case 8 that houses the auxiliary coil 10, and FIG.
), (b) are a side sectional view and a plan view of the case 8 that houses the auxiliary coil 10, FIGS. 7(a) and (b) are a side view and a plan view of the auxiliary coil bobbin 11, and FIG. FIG. 9 is a perspective view illustrating the process of combining the auxiliary coil 10 and case 8, FIG. 11 is a perspective view illustrating the auxiliary coil 10 and case 8 before they are combined. be.

The shape of the case 8 is shown in FIGS. 5 and 6 (a).

As shown in (b), it is approximately box-shaped with a width (X-axis direction) p, a length (Z-axis direction) 1, and a depth (Y-axis direction) I3 (the part that is integrated with the terminal part is shown in the figure). (not shown), both sides 12a
, fitting holes 13.14.13.1 at both ends of 12b, respectively.
The fitting hole 13 and the fitting hole 14 provided with 4 are formed at a predetermined interval in the length direction (Z-axis direction), and -
The fitting holes 13, 14 on the side surface 12a and the fitting holes 13, 14 on the other side surface 12b are provided so as to face each other at a predetermined interval in the width direction (X-axis direction). Both sides 12a
, 12b have guide grooves 1 on each of the inner surfaces 15a and 15b.
6.17.16.17 are provided so as to face each other.

The width of the entrance side 18.19 of the guide groove 16.17 is the inner surface 15a.
, 15b is slightly larger than the width j11, and the fitting hole 13,
The width around 14 is made equal to the width 11, and a suitable taper is provided between this inlet side 18, 19 and the fitting hole 13°14.

Furthermore, guide ribs 20 are provided on both sides of the guide groove 16 on the fitting hole 13 side.
．． 20 is provided, and the guide rib 20°20 is located on the inner surface 15a.
, 15b, so that it is easy to guide the auxiliary coil bobbin 11 into the fitting hole 13.13.

The shape of the auxiliary coil bobbin 11 is shown in FIG. 7(a).

As shown in (b), each collar 21.21 is provided with protrusions 22.22 extending outward at right angles (in the Z-axis direction) from both end faces, and further extends from the tip of the protrusion 22.22.22°22. The fitting hole 13 of the case 8 extends outward from the right angle (X-axis direction). Fitting hole 14 - Fitting boss 23 for fitting with fitting hole 14 - Fitting boss 23. Mating boss 2
4-Each fitting boss 24 is provided.

The width of the tip 25 of the fitting boss 23 and the tip 25 of the fitting boss 24 is set at the entrance side 18 of the guide groove 16, 17 of the case 8.
Make it the same width as No. 19.

The attachment of the auxiliary coil 10 to the case 8, in which the winding ring 61.62 is wound around the auxiliary coil bobbin 11 and the ferromagnetic core 71.72 is inserted and fixed inside, is shown in FIGS. 8, 9 and 11. As shown in the figure, fitting bosses 23, 23, 24.2 provided on a pair of collars 21.21 of the auxiliary coil bobbin 11
4 through the inlet side 18 of the case 8 into the guide groove 16.16.
17° 17, then fit the mating boss 23
Insert ゜23 deep along guide grooves 16 and 16.

Accordingly, the protrusion 22.22 becomes inside the case 8, and the fitting boss 23.23 fits into the fitting hole 13, 1 of the case 8.
When the position 3 is reached, the projections 22, 22 which were inside the case 8 return to their original state due to their elasticity, and are now fitted into the state shown in FIG.

Next, insert the other fitting boss 24.24 into the guide groove 17.
17, the fitting boss 24.24 reaches the position of the fitting hole 14.14 of the case 8 in the same manner as described above, and is fitted there. As a result, the auxiliary coil 10 is inserted into the case 8. 8, the mounting is retracted and the state shown in FIG. 9 is achieved.

The winding ring 662, which is a component of the auxiliary coil 10, is connected to the horizontal deflection coil 3 as shown in FIGS. 3(a) and 3(b).
The winding rings 61 and 62 are connected in series to a parallel circuit of 1.32, and the winding rings 61 and 62 are connected in parallel or in series. Further, a capacitor C and a resistor R are connected to both ends of each wire ring 61 and 62 to prevent ringing.

In the deflection yoke device having such a configuration, as shown in FIG. 4, when the deflection yoke device is attached to the CRT 26 and the winding rings 6+, 6+ of the horizontal deflection coil 31, 32 and the auxiliary coil 10, 10 are energized, The horizontal deflection coils 31 and 32 forming the deflection yoke 5 emit an unnecessary magnetic field φ, particularly to the front side of the screen of the CRT 26, but the auxiliary coil 10 and 10 generate a magnetic field φ of opposite polarity. This cancels out this unnecessary magnetic field φ□.

Now, the configuration of the second embodiment of the present invention is shown in FIG. 10, and in comparison with the configuration of the first embodiment of the present invention described above, the case 8 housing the auxiliary coil 10 is located outside the deflection yoke 5. They are different in that they are attached along the shape of , but the rest of the structure is the same, so the same components are given the same reference numerals and their explanations will be omitted.

As described above, the deflection yoke device according to the present invention has the above-mentioned first aspect. Of course, in addition to the configuration shown in the second embodiment, the following configuration may be used.

■ The vertical deflection coils 2, 2 of the deflection yoke 5 are saddle-shaped coils, but they may also be toroidal coils wound directly around the core 1.1. ■ The auxiliary coil 10.10 generates a magnetic field φ in the Z-axis direction.

The winding shafts 61 and 62 of the auxiliary coil 10 are made of enamelled copper wire as described above. However, vinyl electric wires or printed wiring may also be used.

In addition, the number of turns, shape, and dimensions may be appropriately selected depending on the degree of the unnecessary magnetic field φ1, the chassis structure of the display device or television receiver, and the impedance of the horizontal deflection coil 31.32. Ferromagnetic core 71.72 Of course, they can be selected appropriately depending on the shape and dimensions of the winding shafts 61 and 62, but they may be omitted depending on the degree of the unnecessary magnetic field φ□.

■ Capacitor C connected in parallel with winding shaft 61, 62
and the resistance R are for reducing the parasitic vibration of the horizontal deflection current due to the coils 61 and 62, and the constants should be determined according to the degree of parasitic vibration, or the effect of the present invention cannot be prevented even if it is absent ■ Auxiliary coil 10 are provided as a pair symmetrically up and down on the Y axis on the CRT screen side, but they may be provided on the opposite side to the screen side, or may be provided on the screen side and the opposite side at the same time (effects of the invention). As such, the deflection yoke device according to the present invention has the following effects (1) to (2).

(1) Since the unnecessary magnetic field related to the horizontal deflection magnetic field emitted to the outside of the deflection yoke can be effectively canceled out with a magnetic field of opposite polarity to the unnecessary magnetic field generated from the auxiliary coil, when this is applied to, for example, a CRT. This has the effect of reducing unnecessary magnetic fields emitted from the front of the screen.

(2) Since unnecessary magnetic fields on the front side of the CRT screen can be effectively canceled out, devices using CRTs can be made smaller and lighter.

- Since the auxiliary coil is housed in the case, the auxiliary coil can be attached to the outside of the deflection yoke with good mounting position accuracy, and at the same time it is possible to improve workability and reduce the amount of material.

[Brief explanation of the drawing]

FIGS. 1 and 10 respectively show the first part of the deflection yoke device according to the present invention. A side view of the second embodiment, Figure 2 is a perspective view of the auxiliary coil shown in Figure 1, Figures 3(a) and (b) are connection diagrams of the horizontal deflection coil and the auxiliary coil, and Figure 4 is the horizontal deflection coil. An explanatory diagram showing the state of the magnetic field generated from the coil and the auxiliary coil, FIG. 5 is a perspective view of the case 8 that houses the auxiliary coil 10, and FIGS. 6(a) and (b) are the case 8 that houses the auxiliary coil 10. A side sectional view and a plan view of FIG. 7(a). (b) is a side view and a top view of the auxiliary coil bobbin 11, and the eighth
The figure is a perspective view illustrating the middle of the combination of the auxiliary coil 10 and case 8, FIG. 9 is a perspective view illustrating the state after the auxiliary coil 10 and case 8 are combined, and FIG. FIG. 2 is a perspective view for explanation. 1.71.72...core, 2...vertical deflection coil,
31.32... Horizontal deflection coil, 4... Coil bobbin, 5... Deflection yoke, 61.62... Winding shaft, 8
... Case, 10 ... Auxiliary coil, 11 ... Auxiliary coil bobbin, 13.14 ... Fitting hole, 16.17.
...Guide groove, 23.24...Mating boss, φ. ...
Magnetic field, φ1--Unnecessary magnetic field. (C4-) Figure 9 Figure 0

Claims (1)

[Scope of Claims] A deflection yoke including a horizontal deflection coil, a vertical deflection coil, and a core; a pair of auxiliary auxiliaries each housed in a pair of cases attached to the outside of the deflection yoke and connected to the horizontal deflection coil; A deflection yoke device comprising: a coil, and configured such that the pair of auxiliary coils generate a magnetic field having a polarity opposite to an unnecessary magnetic field related to the horizontal deflection magnetic field generated from the horizontal deflection coil.