JP2580242Y2 - Core for deflection yoke - 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 used for various CRT display devices such as a television receiver, and more particularly, to a structure of a core thereof.

[0002]

2. Description of the Related Art As described in, for example, Japanese Utility Model Laid-Open Publication No. 53-118414, a deflection yoke core having a structure shown in FIG. 3 is well known.
In FIG. 3, a core 1 is formed in a trumpet shape by a magnetic material such as ferrite, and a large number of coil winding guide grooves 2 are formed on the inner surface of the core 1 substantially along the axial direction. The extension of each guide groove 2 is focused on the central axis P of the flared core 1. That is, each guide groove 2 is formed on the inner surface of the core 1 so as to have a complete radiation pattern centered on P. Then, as is well known, the windings of the toroidal type vertical deflection coil and the saddle type horizontal deflection coil are wired along the guide groove 2.

[0003]

As shown in FIG. 3, the deflection yoke core 1 having the coil winding guide grooves 2 formed in a complete radiation pattern as shown in FIG. The winding distribution function does not change much depending on the position in the core axis direction. Therefore, it is not easy to adjust the magnetic field distribution, and almost any other means must be used to adjust barrel scan distortion, pincushion figure distortion, etc., and to adjust convergence characteristics. Therefore, instead of providing a coil winding guide groove entirely on the inner surface of the core as in JP-A-62-93840, a guide groove is provided only on the inner surface of the small-diameter portion of the wrapper-type core. Is also known that does not have a guide groove. According to this, the horizontal deflection coil and the vertical deflection coil can be laid out in a free pattern without being defined in the guide groove, so that a deflection yoke in which the magnetic field distribution can be easily adjusted can be obtained. However, since the wiring pattern of the deflecting coil is not defined in the guide groove, it is very troublesome to wire the coil in the designed pattern, and the variation in characteristics among products becomes large.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to enable a deflection coil to be easily and accurately wired in accordance with a previously designed pattern, and to finally provide a magnetic field distribution. An object of the present invention is to provide a core structure capable of forming a deflection yoke having characteristics that can be easily adjusted.

[0005]

In the present invention, a large number of coil winding guide grooves are formed substantially in the axial direction on the inner surface of the trumpet-shaped core. a guide groove so that the non-radiation pattern which is not focused on the central axis formed of, yet the central axis
Guide grooves that are symmetrical about the vertical line
And the intersection of the extension lines of the guide grooves forming this pair is
Intersect on a vertical line passing through the central axis, and by said vertical line
The center axis becomes closer to the intersection of the extension lines of a pair of adjacent guide grooves.
Increased the distance to the line .

[0006]

The coil winding guide groove of the core is formed in a non-radiation pattern in accordance with the wiring pattern designed in advance of the vertical deflection coil and the horizontal deflection coil, and the center axis of the flapper core is formed.
Two guides that are symmetrical about the vertical line
Set the groove as a pair, and determine the intersection of the extension lines of the pair of guide grooves.
Located on a vertical line passing through the central axis, and
The closer the intersection of the pair of guide grooves, the closer to the center axis
By increasing the distance , the coil can be wired in the desired pattern using the guide groove, and the winding distribution function related to the circumferential angle is changed as desired depending on the core axis direction. The deflection yoke can be easily realized, and the adjustment of the magnetic field distribution becomes easy.

[0007]

1 shows a deflection yoke core according to an embodiment of the present invention. A total of 16 coil winding guide grooves 2a, 2b are formed on the inner surface of the flared core 1 substantially along the axial direction. The non-radiation pattern of the guide groove of the first embodiment is vertically symmetric with respect to a horizontal line passing through the central axis P of the flared core 1, and symmetrical with respect to a vertical line. The extension of each guide groove does not converge on the central axis P. The extension of the eight guide grooves 2a in the upper half of the figure is the core 1
At a point A slightly below the central axis P. The lower half is also symmetrical, and the extension lines of the eight guide grooves 2b converge at a point B slightly above the central axis P.

FIG. 2 shows a deflection yoke core according to a second embodiment of the present invention. Also in this embodiment, the horn type core 1
22 are formed with 22 coil winding guide grooves 20 to 25 and 30 to 35 substantially along the axial direction. The non-radiation pattern of the guide groove is also vertically symmetric with respect to a horizontal line passing through the central axis P, and is also symmetric with respect to a vertical line. Here, the extension of the uppermost guide groove 20 and the extension of the lowermost guide groove 30 are the same straight line passing through the central axis P. The extension lines of the guide grooves 21 on the left and right of the guide groove 20 intersect on a vertical line passing through P, and the intersection point is located below the P by a distance a. The extension lines of the guide grooves 22 on both sides of the guide groove 21 also intersect on a vertical line passing through P, and the distance between the intersection and P is b. Similarly, the extension lines of the two guide grooves 23 also intersect on the vertical line, and the distance between the intersection and P is c. Similarly, the extension lines of the two guide grooves 24 also intersect on the vertical line, and the distance between the intersection and P is d. Similarly, the extension lines of the two guide grooves 25 also intersect on the vertical line, and the distance between the intersection and P is e. Then, as shown in the figure, a>b>c>d> e
Is set to It is 1
One guide groove 30 to 35 is formed. That is, each
Extension lines of guide grooves 20 to 25 and 30 to 35 are trumpet type
It becomes a non-radiation pattern which does not converge on the central axis P of (1).
So that the guide grooves 20 to 25 and 30 to 35 are formed.
Symmetrically with respect to the vertical line of the central axis P
The two guide grooves 21, 21, ..., 25, 2
5, 31, 31,..., 35, 35 are paired, respectively.
Each intersection of the extension lines of these paired guide grooves is
Located on a vertical line passing through the line P, and
The center axis is closer to the intersection of the extension lines of the guide grooves that are close to each other
The distance to P is increased .

[0009]

As described above, according to the invention], the deflection yoke core of the invention is an extension of the guide grooves are formed a guide groove so that the non-radiation pattern which is not focused on the center line of the flared core, the It is symmetric about the vertical line of the center axis.
The two guide grooves are paired, and the pair of guide grooves
Position the intersection of the extension lines of the groove on a vertical line passing through the center axis.
And the guide groove paired closer to this vertical line
Since the distance to the central axis is increased at the intersection, a deflection yoke with uniform characteristics can be realized by a simple operation by arranging the vertical deflection coil and the horizontal deflection coil along the guide groove, and The winding distribution function can realize a deflection yoke having a high ability to adjust a magnetic field distribution which contributes to correction of barrel scanning distortion and pincushion pattern distortion and correction of convergence characteristics.

[Brief description of the drawings]

FIG. 1 is a front view and a sectional view of a deflection yoke core according to a first embodiment of the present invention.

FIG. 2 is a front view and a sectional view of a deflection yoke core according to a second embodiment of the present invention.

FIG. 3 is a front view and a sectional view of a conventional deflection yoke core.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Core 2 Guide groove 2a, 2b Guide groove 20-25 Guide groove 30-35 Guide groove P Center axis

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H01J 29/76

Claims (1)

(57) [Scope of request for utility model registration] 1. A core formed in a trumpet shape by a magnetic material and having a plurality of coil winding guide grooves formed substantially in an axial direction on an inner surface thereof. Guide grooves are formed in a non-radiation pattern that does not converge on the central axis , and furthermore,
The two symmetrical guide grooves are paired,
The intersection of the extension lines of the paired guide grooves is a vertical line passing through the central axis
Gas that intersects above and is closer to the vertical line
The distance from the center axis is larger at the intersection of the extension of the id groove.
A core for a deflection yoke, which is characterized in that it has a large diameter .