JP2649878B2 - Deflection yoke for black and white display monitor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke for a black-and-white display monitor, and more particularly to a deflection yoke for a black-and-white display monitor with a reduced radiation magnetic field.

[0002]

2. Description of the Related Art A predetermined regulation is set in consideration of the influence of a radiated magnetic field from a display monitor on other devices or the human body. Such radiation fields originate from the horizontal and vertical deflection coils of the deflection yoke.

In a color display monitor, a deflection yoke in which horizontal and vertical deflection coils are saddle type is mainly used. In this case, a radiated magnetic field of interest mainly exists in front of the display monitor.

As a prior art for reducing a radiation magnetic field existing in front of the display monitor, for example, FIG.
Deflection yokes 31, 41 as shown in FIGS. The deflection yoke 31 has a pair of horizontal auxiliary coils 32a and 32b wound in a club shape, and generates a magnetic field in the horizontal auxiliary coils 32a and 32b in a direction opposite to that of the horizontal deflection coil. Has been reduced.

In the deflection yoke 41, a pair of horizontal auxiliary coils 42a and 42b wound on a bobbin are mounted in a front opening, and the horizontal auxiliary coils 42a and 42b are oriented in the direction opposite to the radiation magnetic field of the horizontal deflection coil. To reduce the radiated magnetic field.

Another prior art is disclosed in Japanese Patent Application Laid-Open No. 1-217.
No. 839 discloses an apparatus disclosed therein. In this case, a ring-shaped ferrite core having two coils is arranged between a deflection yoke and a CRT screen.

On the other hand, in a monochrome display monitor, a deflection yoke having a toroidal vertical deflection coil is often used. FIG. 13 shows a schematic configuration of a toroidal type vertical deflection coil.

In the vertical deflection coil 50, 51 is an upper vertical deflection coil core, 52 is a lower vertical deflection coil core, 53 is an upper vertical deflection coil, and 54 is a lower vertical deflection coil. H1 is a radiation magnetic field generated by the upper vertical deflection coil 53, and H2 is a radiation magnetic field generated by the lower vertical deflection coil 52. These radiation magnetic fields H1 and H2 spread in the lateral direction of the display monitor.

[0009]

In the above-described conventional deflection yokes 31, 41 and the apparatus disclosed in Japanese Patent Application Laid-Open No. 1-217839, a radiation magnetic field existing in front of a display monitor by a saddle type deflection coil is reduced. Is valid. However, for a black-and-white display monitor using a deflection yoke in which the vertical deflection coil is a toroidal type, the radiation magnetic field exists in the lateral direction of the display monitor, so that the radiation magnetic field cannot be reduced effectively. There is.

Accordingly, an object of the present invention is to provide a black-and-white display monitor in which the vertical deflection coil is of a toroidal type, so that the radiation magnetic field existing in the lateral direction in addition to the radiation magnetic field existing in front of the display monitor can be effectively reduced. To provide a deflection yoke for a black and white display monitor.

[0011]

A deflection yoke for a black-and-white display monitor according to the present invention is a deflection yoke for a black-and-white display monitor in which a vertical deflection coil is of a toroidal type. A pair of quadrilateral horizontal auxiliary coils having no bobbin formed on the front bend portion of the pair of horizontal deflection coils are mounted on the outer peripheral edge of the pair of horizontal deflection coils via a coil holder for accommodating the quadrilateral horizontal auxiliary coil, and A vertical deflection coil core formed from a loop-shaped or magnetic metal material
A narrow ring is arranged between the front end and the rear end of the vertical deflection coil core so as to surround a part of the vertical deflection coil core.
Further, it is characterized in that it is supported by the coil holder .

[0012]

In the deflection yoke for a black-and-white display monitor according to the present invention, a pair of quadrilateral horizontal auxiliary coils formed in an arc shape substantially along the outer periphery of the front bend portion of the horizontal deflection coil are provided outside the front bend portion of the pair of horizontal deflection coils. It is mounted so as to be located on the periphery. Thus, a magnetic field in the opposite direction to the radiation magnetic field spreading in front of the deflection yoke is generated from the quadrilateral horizontal auxiliary coil, so that the radiation magnetic field spreading in front of the deflection yoke can be reduced. Since the quadrilateral horizontal auxiliary coil is housed in the coil holder, it can be easily attached to and detached from the deflection yoke.

A ring formed by forming a plate-shaped or foil-shaped metal magnetic material into a loop shape is disposed between a front end and a rear end of the vertical deflection coil core so as to surround a part of the vertical deflection coil core . For this reason, the radiation magnetic field which spreads in the lateral direction of the deflection yoke passes through the inside of the ring, and can be prevented from leaking outside in the horizontal direction.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the embodiment shown in the drawings. Note that this does not limit the present invention. FIG. 1 is a right side view showing the configuration of an embodiment of a deflection yoke for a black-and-white display monitor of the present invention, and FIG. 2 is a rear view thereof (the screen side of the display monitor is the front side).

In the deflection yoke 1 for a black and white display monitor, 2 is a saddle type horizontal deflection coil, 3 is a toroidal type vertical deflection coil, 4 is a vertical deflection coil core,
5 is a coil separator. Reference numeral 6 denotes an annular coil holder in which a pair of quadrangular horizontal auxiliary coils 7a and 7b described later is housed, which comprises an annular member 8 and an arc-shaped insulating cover 9. Reference numeral 10 denotes a ring holder, 11 denotes a ring, and 12 denotes a front bend of the horizontal deflection coil 2. FE and RE indicate a front end and a rear end of the vertical deflection coil core.

FIGS. 3A and 3B are a rear view and a plan view of the quadrilateral horizontal auxiliary coil 7, respectively. The quadrilateral horizontal auxiliary coil 7 is formed by winding a self-bonding wire having a fusion layer made of a polyamide or the like on the outer periphery of an insulation layer made of a polyurethane or polyester, and bending the front bend portion 12 of the horizontal deflection coil 2 using a winding form.
Are wound in an arc-shaped quadrilateral substantially along the outer peripheral edge of the wire, and after the winding, the self-bonding wires are formed by applying heat or fusing with hot air.

FIGS. 4A and 4B are rear views illustrating the structure of the annular member 8 constituting the annular coil holder 6. FIG.
A plan view shows a state in which the quadrangular horizontal auxiliary coils 7a and 7b are housed. The annular member 8 is provided with a groove along its circumference. Then, storage grooves 8a, 8a for accommodating one side of the quadrangular horizontal auxiliary coils 7a, 7b at positions facing the grooves, and rear sides of the annular member 8 (rear portions of the deflection yoke) from both sides of the storage grooves 8a, 8a. Grooved columns 8b, 8b provided with grooves for accommodating two sides of each of the quadrangular horizontal auxiliary coils 7a, 7b established toward
Elastic engaging claws 8c, 8 for attaching the annular member 8 to the coil separator 5 of the deflection yoke.
c is provided on the inner peripheral wall surface of the annular member 8.

FIGS. 5A and 5B are a rear view and a plan view of the arc-shaped insulating cover 9 constituting the annular coil holder 6. FIG. The arc-shaped insulating cover 9 is fitted to the ring member 8. The arc-shaped insulating cover 9 has an arc-shaped storage groove 9a for accommodating one side of the quadrilateral horizontal auxiliary coil 7 provided along the arc portion, and columns 9b, 9b having grooves formed on both sides of the storage groove 9a. And elastic locking claws 9c, 9c provided at the distal ends of the columns 9b, 9b. Further, a ring retainer 10 of an elastic piece for fixing the ring 11 to the arc-shaped insulating cover 9 has an arc-shaped insulation. It is provided on the inner peripheral wall surface of the cover 9.

The circular insulating cover 9 and the annular member 8 are fitted by fitting the grooved columns 8b, 8b of the circular member 8 into the grooves of the columns 9b, 9b of the circular insulating cover 9, respectively. The elastic locking pawls 9c, 9c are locked to the grooved supports 8b, 8b of the annular member 8. FIGS. 6A and 6B show an annular coil holder 6 containing a pair of quadrangular horizontal auxiliary coils 7a and 7b formed in this manner.

FIG. 7 is an explanatory view of the ring 11. The ring 11 is formed of a permalloy plate or a silicon steel plate having a thickness of 0.1 to 0.5 mm and a width of 10 to 15 mm in a loop shape so that an outer diameter thereof substantially matches an inner diameter of the arc-shaped insulating cover 9. Also, an amorphous foil or the like having a thickness of about 2.0 μm and a width of 10 to 15 mm may be formed in a loop shape. The ring 11 is inserted between the inner peripheral wall surface of the arc-shaped insulating cover 9 and the ring retainer 10 and is fixed to the annular coil holder 6 as shown in FIG.

Thus, a pair of quadrilateral horizontal auxiliary coils 7
The annular coil holder 6 accommodating a and 7b and fixing the ring 11 is fitted to the coil separator 5 on the outer peripheral edge of the front opening of the horizontal deflection coil 2 by being locked by the elastic locking claw 8c. At this time, a pair of quadrilateral horizontal auxiliary coils 7
Each of a and 7b is mounted so as to be located on the outer peripheral edge of the front bend portion 12 of each of the pair of horizontal deflection coils 2. The ring 11 is a front end FE of the vertical deflection coil core.
And the rear end RE are disposed at positions surrounding the deflection yoke main body. Then, the pair of quadrilateral horizontal auxiliary coils 7a and 7b mounted as described above is
Connect in series or in parallel.

Now, a magnetic field formed when a high-frequency deflection current is generally applied to the saddle type horizontal deflection coil will be described with reference to FIGS. 9 and 10. FIG. The magnetic field formed in the horizontal deflection coil includes the magnetic fields Hy1 and Hy1 formed by the main deflection coil unit 13 of the horizontal deflection coil and the magnetic field Hy formed by the front bend unit 12 of the horizontal deflection coil.
As shown in FIG. 9, the magnetic fields Hy1 and Hy1 of the main deflection coil section 13 and the magnetic fields Hy2 and Hy2 of the front bend section 12 form mutually opposite magnetic fields.
Usually, the magnetic fields Hy1 and Hy1 are magnetic fields Hy2 and Hy2.
, The strength of the magnetic field is stronger. Accordingly, the distribution of the magnetic field leaking from the horizontal deflection coil to the outside becomes a distribution shown by a broken arrow in FIG. 10, and the radiated magnetic field 14 spreading forward from the front opening of the horizontal deflection coil becomes the main deflection coil portion 13 of the horizontal deflection coil. Are generated as a combined magnetic field of the magnetic fields Hy1 and Hy1 formed by the magnetic field and the magnetic fields Hy2 and Hy2 formed by the front bend portion 12, that is, (Hy1−Hy2).

Therefore, the quadrilateral horizontal auxiliary coils 7a, 7b formed as described above are mounted on the outer peripheral edge of the front bend portion 12 of the horizontal deflection coil 2, and the magnetic field generated from the quadrilateral horizontal auxiliary coils 7a, 7b 1 are applied to the quadrangular horizontal auxiliary coils 7a and 7b so that the magnetic fields are in the same direction as the magnetic fields Hy2 and Hy2 formed in the front bend portion 12 of the horizontal deflection coil.
When the high-frequency horizontal deflection current in the direction of the arrow shown in FIG. 1 is applied, the magnetic fields Hy2 and Hy2 formed in the front bend portion 12 of the horizontal deflection coil are strengthened. The action of the magnetic field is enhanced.
As a result, the radiation magnetic field 14 spreading forward from the front opening of the horizontal deflection coil 2 is reduced.

The radiated magnetic field in the horizontal direction by the vertical deflection coil 3 intensively passes through a ring 11 formed of a plate-shaped or foil-shaped metal magnetic material. Therefore, the radiation magnetic field is prevented from leaking in the lateral direction of the display monitor.

Further, since the ring 11 functions as the magnetic core of the quadrilateral horizontal auxiliary coils 7a and 7b, the radiation magnetic field can be effectively reduced even if the number of turns of the quadrilateral horizontal auxiliary coils 7a and 7b is small.

In the deflection yoke for a black-and-white display monitor of the present invention, since the ring 11 is fixed to the annular coil holder 6 for accommodating the quadrangular horizontal auxiliary coils 7a and 7b, the quadrilateral horizontal auxiliary coils 7a and 7b and the ring are fixed. 11 can be easily attached to and removed from the deflection yoke.

The rectangular horizontal auxiliary coils 7a, 7b
Can be composed of a collective wire in which a plurality of litz wires or small-diameter insulated wires are twisted or simply bundled.
In this case, the high frequency loss of the auxiliary coil can be reduced.

[0028]

According to the deflection yoke for a black-and-white display monitor of the present invention, in a black-and-white display monitor in which the vertical deflection coil is of a toroidal type, the radiation magnetic field existing in front of the display monitor and the radiation magnetic field existing in the lateral direction are reduced. It can be reduced effectively.

[Brief description of the drawings]

FIG. 1 is a right side view of a deflection yoke for a black and white display monitor of the present invention.

FIG. 2 is a rear view of the deflection yoke for a black-and-white display monitor of the present invention.

FIG. 3 is an explanatory view of a quadrilateral horizontal auxiliary coil according to the apparatus of FIG. 1;

FIG. 4 is an explanatory view of a ring member according to the apparatus of FIG. 1;

FIG. 5 is an explanatory view of an arc-shaped insulating cover according to the apparatus of FIG. 1;

FIG. 6 is an explanatory view of an annular coil holder according to the apparatus of FIG. 1;

FIG. 7 is an explanatory view of a ring according to the apparatus of FIG. 1;

FIG. 8 is an explanatory view of an annular coil holder in a state where a ring according to the apparatus of FIG. 1 is fixed.

FIG. 9 is an explanatory diagram of a magnetic field of a horizontal deflection coil.

FIG. 10 is an explanatory diagram of a magnetic field of a horizontal deflection coil.

11 is an explanatory diagram of a current flowing through a quadrilateral horizontal auxiliary coil according to the apparatus of FIG. 1;

FIG. 12 is an exemplary view of a conventional deflection yoke.

FIG. 13 is a schematic explanatory view of a toroidal type vertical deflection coil.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Deflection yoke for monochrome display monitor 2 Horizontal deflection coil 3 Vertical deflection coil 4 Vertical deflection coil core 6 Toroidal coil holder 7a, 7b Quadrilateral horizontal auxiliary coil 10 Ring holder 11 Ring

Claims (1)

(57) [Claims] 1. A deflection yoke for a black-and-white display monitor in which a vertical deflection coil is of a toroidal type. A pair of quadrilateral horizontal auxiliary coils not having a bobbin formed in an arc shape substantially along an outer peripheral edge of a front bend portion of a horizontal deflection coil. vertical but which together are mounted via a coil holder for accommodating the quadrilateral horizontal auxiliary coils on the front bend outer peripheral edge of said pair of horizontal deflection coils, to form a plate-like or foil-like metal magnetic material in the form of a loop Wider than deflection coil core
And it is arranged to surround a portion of the vertical deflection coil core between the front and rear ends of the narrow rings vertical deflection coil core
A deflection yoke for a monochrome display monitor, which is supported by the coil holder .