JPH05314926A - Deflection yoke - Google Patents

Abstract

PURPOSE:To provide an image which has no pin-cushion distortions at the upper and lower parts of a screen due to the irregularities of a deflection yoke and an image receiving tube by correcting such distortions in a barrel tendency. CONSTITUTION:On the inner periphery side of the enlarged portion 11A of a coil bobbin 11, the recessed portions 11E are respectively formed at upper and lower positions on a vertical Y-axial line. The respective recessed portions 11E are mounted with auxiliary coils 12, which are formed into individually independent closed circuits by turning a winding twice, e.g., and connecting the ends, via a tape 13. In this way, a current flows through the auxiliary coils 12 with a magnetic field generated by a horizontally deflecting coil 4 and a vertical deflection coil 5, while cancelling a magnetic field which causes screen distortion, to allow the correction of pin-cushion screen distortions which arise at the upper and lower parts of a screen.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a television receiver,
The present invention relates to a deflection yoke suitable for use in a CRT display device or the like.

[0002]

2. Description of the Related Art FIGS. 9 to 11 show a deflection yoke in the prior art.

In the drawing, reference numeral 1 denotes a deflection yoke according to the prior art. The deflection yoke 1 has a diametrically enlarged portion 2A which diametrically expands forward and a collar at the front and rear ends of the diametrically enlarged portion 2A. A front end enlarged portion 2B, a rear end enlarged portion 2C, which are provided in the shape of FIG.
As shown in FIG. 3, the coil bobbin 2 is composed of a partition plate 2D for partitioning each horizontal deflection coil 4 which will be described later, and the core 3 is provided on the outer peripheral side of the coil bobbin 2 and the inner peripheral side of the coil bobbin 2, A pair of saddle-shaped horizontal deflection coils 4 and 4 provided in an upper and lower direction by a partition plate 2D and an outer peripheral side of the coil bobbin 2 are wound around the core 3 in the left and right directions. The vertical deflection coils 5 and 5 of a toroidal type are generally configured. The deflection yoke 1 is attached to the neck portion 6A of the picture tube 6.

Here, each of the horizontal deflection coils 4 is shown in FIG.
As shown in FIG. 4, main portions 4A, 4A arranged along the inner peripheral side of the expanded diameter portion 2A of the coil bobbin 2, front crossover portions 4B, 4B housed in the front end enlarged portion 2B, and the rear end enlarged portion Part 2
It consists of the rear crossover parts 4C and 4C housed in C,
By thus providing the horizontal deflection coils 4 on the coil bobbin 2 in a saddle shape, the horizontal deflection coils 4 are formed with windows 4D, 4D in the upward and downward directions.

When the central axis of the deflection yoke 1 is O, the horizontal direction to the central axis O is the X axis line, and the vertical direction is the Y axis line, the partition plate 2D of the coil bobbin 2 is located on the X axis line. , And each of the horizontal deflection coils 4 is arranged in the upward and downward directions by the X axis.

The conventional deflection yoke 1 thus constructed is attached to the neck portion 6A of the picture tube 6, and an electron beam is output from an electron gun (not shown) provided in the neck portion 6A. The electron beam is deflected by the horizontal deflection coil 4 and the vertical deflection coil 5 and is irradiated on the screen 6B of the picture tube 6 so that an image is displayed on the screen 6B.

[0007]

By the way, in the above-mentioned prior art, the deflection yoke 1 is composed of a pair of horizontal deflection coils 4 and 4 and vertical deflection coils 5 and 5, respectively. Even if there is a manufacturing variation in the deflection yoke 1 that is produced, it is not easy to adjust this, and for the picture tube 6 as well, once manufactured, even if there is a manufacturing variation, This is difficult to adjust.

Due to these variations, as shown in FIG. 11, a lot of pincushion-like screen distortion occurs in the upper and lower parts of the screen 6B.

The present invention has been made in view of the above-described problems of the prior art. The present invention has a simple structure and causes pincushion-like distortion (pincushion distortion) to have a barrel tendency, thereby causing screen distortion in upper and lower portions of the screen. It is an object to provide a deflection yoke that can be corrected.

Therefore, in the prior art, a method of changing the position of the core 3, a method of changing the coil length of each of the deflection coils 4 and 5, a method of adding a correction magnet separately,
The screen distortion is corrected by various means such as a method of arranging four-point correction pieces at the corners of the physique.

However, in any of the methods, it is necessary to drastically change the shape of the coil bobbin, there is an adverse effect that other screen distortion occurs, and the cost is increased due to an increase in the number of parts. There is a new open question.

[0012]

The feature of the structure adopted by the present invention to solve the above-mentioned problems is that when the horizontal direction is the X axis and the vertical direction is the Y axis with respect to the central axis O of the deflection yoke. , At least one auxiliary coil is provided on each of the upper and lower sides on the Y-axis in the magnetic field generated from the horizontal deflection coil and the vertical deflection coil, and each auxiliary coil forms an independent closed circuit. It has a shape that is wound around.

[0013]

With the above structure, a current flows through each auxiliary coil due to the magnetic fields generated from the horizontal deflection coil and the vertical deflection coil, and this current causes a reverse magnetic field to be generated in the auxiliary coils. It is possible to cancel the magnetic field that causes the screen distortion of.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.

First, a first embodiment will be described with reference to FIGS. In the embodiments, the same components as those of the above-described conventional technique are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numeral 11 denotes a coil bobbin according to the present embodiment. The coil bobbin 11 is directed toward the front of the deflection yoke in substantially the same manner as the coil bobbin 2 of the prior art, and the enlarged diameter portion 11A and the enlarged diameter portion 11A. A front end enlarged portion 11B and a rear end enlarged portion 1 are provided at the front and rear ends of the diameter portion 11A in a brim shape, respectively.
1C and a partition plate 11D for partitioning each horizontal deflection coil 4 as shown in FIG. 1, the coil bobbin 11 according to the present embodiment has an auxiliary member described below at the upper and lower positions on the Y axis of the expanded diameter portion 11A. Recesses 11E, 11 for mounting the coil 12
E is formed.

A pair of horizontal deflection coils 4 and 4 are provided in a saddle shape on the inner peripheral side of the coil bobbin 11 by a partition plate 11D, and a pair of horizontal deflection coils 4 and 4 are provided on the outer peripheral side of the expanded diameter portion 11A. The core 3 and the vertical deflection coil 5 described in the technology
5 are provided. In addition, each recess 11E of the coil bobbin 11 is located in the window 4D of each horizontal deflection coil 4.

Reference numerals 12 and 12 denote auxiliary coils. Each of the auxiliary coils 12 has a shape in which an independent closed circuit is formed by winding the winding for two turns and connecting the ends. Each auxiliary coil 12 is the coil bobbin 11
Each of the recesses 11E of the
It is mounted on the coil bobbin 11 by being closed by.

The deflection yoke according to the present embodiment has the above-mentioned structure, and the operation of the deflection yoke itself is not significantly different from that of the prior art.

However, in this embodiment, the coil bobbin 11 is used.
In the enlarged diameter portion 11A, one concave portion 11E for mounting the auxiliary coil 12 is formed above and below the Y axis, and each concave portion 11E is formed.
Since the auxiliary coil 12 having the shape of an independent closed circuit is provided here, the magnetic field generated from each horizontal deflection coil 4 and each vertical deflection coil 5 is applied to each auxiliary coil 1 described above.
2 and a current is generated in each auxiliary coil 12, and a small magnetic field is generated in a direction in which the magnetic fields from each horizontal deflection coil 4 and each vertical deflection coil 5 are canceled. As a result, as shown in FIG. 3, the pincushion-like screen distortion that has occurred in the upper and lower parts of the screen 6B of the picture tube 6 can be corrected in the direction of the arrow to make it a barrel tendency. It is possible to reliably correct the screen distortion in, and to display an image without distortion.

Further, since the auxiliary coil 12 can be mounted after the deflection yoke is assembled, the strength of the magnetic field to be canceled can be changed by changing the thickness of the winding and the number of turns against the variations due to the individual deflection yokes. It is possible,
It is possible to surely change the pincushion-like screen distortion due to each deflection yoke to a barrel tendency. Further, in this case, it is not necessary to arrange the auxiliary coils 12 mounted on the upper and lower sides in the same shape, and the screen distortion can be effectively corrected.

Next, as shown in FIGS. 4 to 8, the second embodiment is characterized in that two auxiliary coils are provided above and below the Y-axis. In the embodiments, the same components as those of the above-mentioned conventional technique and the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numeral 21 denotes a coil bobbin according to the present embodiment, which coil bobbin has a diameter expanded portion 21A and a front end enlarged portion 2
1B, a rear end enlarged portion 21C and a partition plate 21D, and two concave portions 21E, 21E, ... For mounting auxiliary coils 22 to be described later are formed at upper and lower positions on the Y axis of the enlarged diameter portion 21A. Has been done.

Reference numerals 22, 22, ... Denote auxiliary coils, and each auxiliary coil 12 has its winding wound three turns as shown in FIG. Each auxiliary coil 22 is inserted into each recess 21E of the coil bobbin 21,
The recesses 21E are attached to the coil bobbin 21 by closing the recesses 21E with a tape 23.

Also in the deflection yoke of this embodiment constructed as described above, the same effect as that of the first embodiment can be obtained, and a pincushion-like screen generated on the upper and lower parts of the screen 6B. The distortion can be corrected to a barrel tendency.

Further, in the present embodiment, the number of auxiliary coils 22 can be increased as compared with the first embodiment, and the adjustment range of the correction magnetic field by each auxiliary coil 22 can be widened, so that on the screen. It is possible to more effectively correct the pink cushion-like screen distortion.

In addition, in the second embodiment, the auxiliary coil 22 provided two by two above and below is formed into a closed circuit independently, but as shown in FIG. 7, they are connected in series. They may be connected, or may be connected in parallel as shown in FIG. 8, and the point is to connect them so as not to cancel the magnetic field and current generated in each auxiliary coil 22 to form a closed circuit.

Further, in each of the above-mentioned embodiments, the recesses 11E and 21E are formed in the coil bobbins 11 and 21, and the auxiliary coils 12 and 22 are mounted in the recesses 11E and 21E. Not limited to this, an auxiliary coil may be attached to the horizontal deflection coil 4 with a tape or an adhesive. The point is that the auxiliary coil is located in the portion affected by the magnetic fields of the deflection coils 4 and 5 and on the Y-axis. In this case, the effect of the auxiliary coil can be further obtained by mounting the horizontal deflection coil 4 at a position near the rear crossover portion 4C of the main portion 4A.

Further, the number of auxiliary coils provided in the upper and lower directions on the Y-axis is not limited to one and two, but three or more may be provided.

On the other hand, the deflection yoke of the present invention may of course be applied to a type in which a vertical deflection coil is wound in a saddle shape.

[0031]

As described above in detail, according to the present invention,
When the horizontal direction is the X-axis line and the vertical direction is the Y-axis line with respect to the central axis O of the deflection yoke, on the upper and lower sides on the Y-axis line in the magnetic field generated from the horizontal deflection coil and the vertical deflection coil, Each has at least one auxiliary coil,
Each of the auxiliary coils is wound so as to form an independent closed circuit, so that the pink cushion-like screen distortion of the upper and lower portions generated on the screen of the picture tube is corrected to a barrel tendency. Therefore, it is possible to reliably capture an image without screen distortion. Further, by adjusting the number of turns of the auxiliary coil and the thickness of the winding, the strength of the correction magnetic field can be adjusted, and the variation due to each deflection yoke can be suppressed.

[Brief description of drawings]

FIG. 1 is a front view of a deflection yoke according to a first embodiment of the present invention as viewed from the tip side.

FIG. 2 is a vertical cross-sectional view of a coil bobbin according to the first embodiment.

FIG. 3 is an explanatory diagram showing on-screen correction according to the first embodiment.

FIG. 4 is a front view of a deflection yoke according to a second embodiment of the present invention as seen from the tip side.

FIG. 5 is a vertical sectional view of a coil bobbin according to a second embodiment.

FIG. 6 is a connection diagram showing a first connection state of an auxiliary coil according to a second embodiment.

FIG. 7 is a connection diagram showing a second connection state of the auxiliary coil according to the second embodiment.

FIG. 8 is a connection diagram showing a third connection state of the auxiliary coil according to the second embodiment.

FIG. 9 is a side view showing a configuration of a deflection yoke according to a conventional technique.

FIG. 10 is a front view of a deflection yoke according to a conventional technique as viewed from the front end side.

FIG. 11 is an explanatory diagram showing pincushion-like screen distortion (pincushion distortion) on the screen according to the related art.

[Explanation of symbols]

 3 core 4 horizontal deflection coil 4D window part 5 vertical deflection coil 6 picture tube 6A neck part 6B screen 11,21 coil bobbin 11E, 21E recessed part 12,22 auxiliary coil

Claims (1)

[Claims] 1. A tubular coil bobbin having a front end enlarged portion and a rear end enlarged portion at both ends of the expanded diameter portion, a core provided in the expanded diameter portion of the coil bobbin, and a horizontal deflection provided along the core. In a deflection yoke including a coil and a vertical deflection coil, when the horizontal direction is the X axis line and the vertical direction is the Y axis line with respect to the center axis O of the deflection yoke, the Y in the magnetic field generated from each of the deflection coils. At least one auxiliary coil is provided on each of the upper and lower sides of the axis,
A deflection yoke, wherein each of the auxiliary coils is wound so as to form an independent closed circuit.