JPH0448616Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a deflection yoke used in a color cathode ray tube, particularly a CRT (Trinitron (registered trademark) type CRT) having a cylindrical face plate.

[Summary of the idea]

A winding groove for guiding the conductor is formed on the inner surface of the winding frame of the hollow-shaped horizontal deflection coil, and an extension of the conductor is formed in this winding groove so as to alleviate the longitudinal distribution of the magnetic field caused by the current flowing through the conductor. By providing an inflection point for changing the direction, misconvergence that occurs at both the upper and lower ends of the screen can be suppressed.

[Conventional technology]

In order to obtain a predetermined production volume, conventional horizontal deflection coils (crape-shaped coils) are manufactured by preparing multiple identical winding molds, winding conductive wire (wire material) around them, energizing them, and shaping them into a predetermined shape. It has a hollow shape and is constructed along the coil frame, that is, the inner surface of the separator.

In this case, the same number of winding machines are prepared for each mold, but there are variations in these winding machines, and there are also variations in the molds.
Moreover, due to fluctuations in the tension when winding the conductor into the mold, variations in the wire rod lot, seasonal fluctuations, etc.
Variations in characteristics occur among the manufactured deflection yokes. Furthermore, since the coil is fitted into separators that vary in size and shape, even if the coil is formed with accurate dimensions using a mold, the characteristics will change due to variations in the separators. Also occurs.

As a solution to these problems, Jikosho
A configuration as shown in Publication No. 57-34673 has also been proposed. That is, as shown in FIGS. 14 and 15 (however, only the upper half of the deflection yoke is shown),
Guide grooves 2 and 3 are formed at the front and rear ends of a coil winding frame 1 (separator) formed in a hollow shape from an insulating material such as resin, and the winding frame 1
As shown in FIG. 14, a winding groove 4 is also formed on the inner surface of the , and the conductor 5 is passed between the rear end guide groove 3 - the left (or right) winding groove 4 - the front end guide groove 2 - the right (or left) side. It has been proposed to wind the conducting wire directly around a so-called conventional separator by winding it through the winding groove 4 to form a deflection yoke. 20 is a core, and 21 is a vertical deflection coil wound toroidally around the core. Note that each drawing shows only the upper half of the deflection yoke, and the lower half is omitted.

In such a deflection yoke, the conducting wire portion that acts to form a horizontal deflection magnetic field is the 14th
As shown in the figure, the deflection yoke is configured to extend radially with respect to the tube axis 10, and it is difficult to obtain a magnetic field distribution for so-called convergence free using this deflection yoke by itself. There were problems such as the need to correct misconvergence.

[Means for solving problems]

In order to solve the above-mentioned problems, we developed a CRT with a cylindrical face plate.
A coil winding frame formed in a hollow shape has guide grooves for the conductor at the front and rear ends, respectively, and a winding groove for the conductor is provided on the inner surface of the coil winding frame, and the winding groove and the front and rear guide grooves are provided. In a deflection yoke in which a conducting wire is wound in a circular shape, the winding groove of the conducting wire is
The plurality of lower winding grooves are formed along the shape of the coil winding frame from the rear to the front of the coil winding frame and in a plane substantially horizontal to the tube axis,
Further, the plurality of winding grooves in the upper part are provided in a plane substantially horizontal to the tube axis at the rear of the coil winding frame near the middle, and are tilted vertically at the front from the middle to reduce the area of the window. The deflection coil is formed so as to be narrow, and has an inflection part near the middle, and the deflection coil is formed so that the conductor is wound around the winding groove as a whole, and the deflection coil has a bending part at the front end of the coil winding frame. It is designed to create a barrel magnetic field.

[Effect]

Regarding the tube axis direction, the rear part of the deflection yoke, that is, the neck part of the color cathode ray tube, becomes a barrel magnetic field, and the front part of the deflection yoke, that is, the opening part, becomes a pink tension magnetic field, so that so-called convergence free and upper and lower pin distortion free are achieved. A barrel magnetic field is generated locally near the opening, thereby correcting distortion at the corners of the screen.

〔Example〕

The deflection yoke according to the present invention will be explained below with reference to FIGS. 1 to 4 of the drawings.
Portions corresponding to those in FIG. 5 are given the same reference numerals and their explanations will be omitted. However, this example also shows only the upper half of the deflection yoke, and the core 20 and vertical deflection coil 21 are omitted.

In this example, four winding grooves 4a to 4d are formed on the inner surface of the winding frame 1 made of an insulating material such as resin, extending substantially horizontally when viewed from the front of the winding frame 1, and furthermore, the tube shaft 10 ( This is the outermost winding groove 4d when viewed from the center axis of this deflection yoke.
Near the opening of the winding groove 4d, the extension direction is changed to a direction almost radiating from the tube axis 10, and the opening part of the winding groove 4d is further formed into a bifurcated shape to form a main groove 4e and a dividing groove 4f. There is.

Regarding these grooves, the rear end guide groove 3 - the right winding groove 4d - the dividing groove 4f - the front end guide groove 2 - the left dividing groove 4f - the same winding groove 4d - the rear end guide groove 3 - the right winding groove 4d. - Same main groove 4e - Front end guide groove 2 - Left side main groove 4e - Same winding groove 4d - Rear end guide groove 3 - Right side winding groove 4c - Front end guide groove 2 - Left side winding groove 4
The conductive wires 5 are continuously wound as shown in c.

Although the horizontal deflection coil is wound and configured as described above, the inflection point 6 in the extension direction in the winding groove 4d is located between the window 1a of the winding frame 1 and the winding as shown in FIG. It is formed at the boundary with the groove 4d. For color cathode ray tubes of general home television receivers, that is, CRTs with cylindrical face plates (Trinitron (registered trademark) type CRTs),
As shown in FIG. 2, when the magnetic path length is L, it is selected to be about 1/4L when viewed from the front opening end.

Furthermore, as shown in FIG. 1, the outer edge 7 of the dividing groove 4f
However, the angle θ of the line connecting the tube axis 10 and the point P that intersects with the outermost edge 8 of the opening of the winding frame 1 with respect to the horizontal line is
Selected between 35° and 50°.

The operation of such a configuration will be explained. First, as shown in FIG. 5, if we look at the case where there is no inflection point 6 according to the present invention described above regarding the winding groove, in the front-rear direction of the deflection yoke, from the approximately intermediate position to the rear end side, as shown in FIG. A barrel magnetic field is created as shown in Figure 7, and a pink tension magnetic field is created on the front end side (opening) as shown in Figure 7, that is, a so-called front-rear distribution is given to the horizontal deflection magnetic field distribution, and so-called convergence free and upper and lower pin distortion free are achieved. As is well known. 6 and 7 are magnetic field distribution diagrams when the inner diameter of the deflection yoke is expressed as the same diameter near the rear end and at the open end, and the hatched portion is the distribution range of the conductor 5. be.

In such a magnetic field distribution, the center electron beam G of the three in-line electron beams will be distorted as shown in Figure 8, that is, in the upper half of the screen, it will be slightly distorted from the center to the left and right. A shape 14 is created that rises up and then falls further toward both ends (for convenience, it is assumed to be a chimney distortion). This distortion appears vertically symmetrically. This is because the offset distortion 14 occurs in a direction perpendicular to the magnetic field, as shown by the dotted line 11 in FIG.

Also, among the three in-line electron beams, the beams R and B on both sides are lateral S, as shown in FIG.
A distortion 15 resulting in a letter-shaped locus (temporarily referred to as S-shaped distortion) is produced. Of course, for both side beams R and B, the Tombi distortion described in FIG. 8 is also superimposed on the S-shaped distortion. Furthermore, screen 1
The lower half of 2 produces a distortion that is symmetrical to the upper half. In practice, it has been found that color deterioration due to misconvergence due to distortion in the corner portions of the screen 12 is particularly noticeable.

However, according to the present invention, as shown in FIG. 10, a small portion of the coil distribution 13 is generated outside the normal coil distribution 5 based on the coils in the dividing groove 4f, the main groove 4e, or both. , As a result, the pink tension magnetic field of this opening is locally made into a barrel magnetic field, which causes the eighth
Since the left and right end portions of the Tombi distortion 14 shown in the figure extend in a direction perpendicular to this magnetic field, the upper half of the screen 12 is lifted up as shown in FIG. 10, and the lower half Then, it will be corrected by going down. Further, both end portions of the S-shaped distortion 15 for beams R and B shown in FIG. 9 are corrected in the same manner.

Further, in the above-mentioned inflection section 6, FIGS.
As shown in Figure 2, the guide pin 17
The wire 5 is formed integrally with the winding frame 1 in advance and projects inward from the inner surface of the winding frame 1, and the conductor 5 is wound in the winding groove of the winding frame 1 on which the guide pin 17 is formed. After that, the guide pin 17 is cut off from its base. As a result, when the conducting wire 5 is wound into the winding groove 4d-dividing groove 4f, the guide pin 17 can effectively prevent the conducting wire 5 from easily coming off from the winding groove at the above-mentioned inflection point 6. can be reliably wound around the winding frame 1.

Furthermore, after winding, the guide pin 17 is cut off from its root, so even when using such a deflection yoke in a color cathode ray tube, the guide pin 17
is not a problem. In addition, in this case, the guide pin 17 is used during injection molding of the winding frame 1.
The direction of exit is selected from the manufacturing mold.

Figure 13 shows another example, and this figure shows the winding frame 1.
is a sectional view taken along a plane perpendicular to the inner surface of the winding frame 1 through the above-mentioned inflection point 6, and in this example, a window hole 18 is formed in the winding frame 1 at the inflection point. This is a case where the above-mentioned conducting wire 5 is wound in a state in which the guide pin 17 is inserted in advance, and then the guide pin 17 is removed from the window hole 18 for use. In this case, it is possible to use a guide pin 17 that is bent so as to prevent the conductive wire 5 from coming off when it is wound in.

In the above description, the inflection point 6 was formed in the outermost winding groove 4d when viewed from the tube axis 10, but it is also possible to provide similar inflection points in other winding grooves.

[Effect of idea]

According to the present invention described above, a portion of the pink union magnetic field near the opening of the deflection yoke locally becomes a barrel magnetic field, so that the rear end side (neck side) of the deflection yoke becomes a barrel magnetic field. The misconvergence that was noticeable mainly at the corners of the screen 12 can be improved by the offset distortion 14 and the S-shaped distortion 15 that occur due to the pink tension magnetic field on the front end side, and in particular, the need for an auxiliary coil. It has a feature that allows you to easily achieve your goals without having to do anything.

[Brief explanation of the drawing]

Figure 1 is a front view showing the upper half of the winding frame with the conductor of the deflection yoke according to the present invention wound around it, Figure 2 is a sectional view taken along line A-A, and Figure 3 is a top view of only the winding frame. 4 is a sectional view taken along line B-B, FIG. 5 is a front view of the upper half of the deflection yoke, which is the premise of the present invention, and FIGS. 6 and 7 are 5 The distribution diagram showing the horizontal deflection magnetic field formed by the deflection yoke shown in FIG.
The figure is a distribution diagram showing the magnetic field generated by the present invention.
Figure 1 is a front view of the winding frame with a guide pin provided at the inflection point, Figure 12 is a cross-sectional view along line C-C, Figure 13
The figure is a cross-sectional view of the case where the guide pin is inserted into the window hole of the winding frame, FIG. 14 is a front view of a conventional deflection yoke, and FIG. 15 is a cross-sectional view taken along the line D--D. 1 is the winding frame, 4a to 4d are the winding grooves, 4e is the main groove,
4f is a dividing groove, 5 is a conducting wire, and 17 is a guide pin.

Claims (1)

[Claims for utility model registration] 1 Having a cylindrical face plate
For a CRT, a coil winding frame formed in a hollow shape has guide grooves for the conductor at the front and rear ends, respectively, and a winding groove for the conductor is provided on the inner surface of the coil winding frame. In a deflection yoke in which a conducting wire is wound in a hollow shape around a guide groove, the winding groove of the conducting wire has a shape such that a plurality of winding grooves at the lower part extend from the rear of the coil winding frame to the front of the coil winding frame. Along the
and is formed in a plane substantially horizontal to the tube axis, and the plurality of winding grooves in the upper part are formed in a plane substantially horizontal to the tube axis from near the middle of the coil winding frame to the rear. , the window part 1 is tilted vertically in the front part from near the middle and has no coil winding frame.
The deflection coil is formed so as to narrow the area of a, and has an inflection part near the middle, and the deflection coil is wound in front of the coil winding frame with the conductor wire wound around the winding groove as a whole. A deflection yoke characterized by forming a localized barrel magnetic field at its end. 2. Utility Model Registration The deflection yoke according to claim 1, characterized in that a removable guide pin is provided in the bending portion to prevent the conducting wire from coming off from the winding groove.