JP2001307657A - Bobbin for deflecting yoke, deflecting yoke, cathode-ray tube and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control a positioning charge of a vertical deflection coil (a coil material of) caused by a rise of temperature of the like. SOLUTION: A deflecting yoke 100A is composed of following components; a bobbin 10A having a cylindrical body 10 as a base material, a vertical deflecting coil 15 rolled inside of the cylindrical body 10, a cylindrical core 30 into which the bobbin 10A can be inserted, and a vertical deflecting coil 35 wound inside of the core 30. Especially, the bobbin 10A has plural numbers for conical protrusions 50A on a peripheral wall 10S1 of the cylindrical body 10. In a state where the bobbin 10A is inserted inside of the core 30, the protrusions 50A contact with the vertical deflecting coil 35 (a coil material of) and tips of the protrusions 50A penetrate through a space of the vertical deflecting coil 35 (a coil material of) to make contact with the inside wall 30S2 of the core 30. For these constitutions, the arranged position of the vertical deflecting coil 35 (a coil material of) can be controlled through protrusions 50A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a deflection yoke bobbin (hereinafter simply referred to as a bobbin) of a deflection yoke mounted on a cathode ray tube (Cathode Ray Tube; CRT).
More particularly, the present invention relates to a technique for improving display quality at the time of high definition display in a display device using a cathode ray tube.

[0002]

2. Description of the Related Art A deflection yoke for a color cathode ray tube equipped with an in-line type electron gun is roughly classified into (a) a horizontal deflection coil for deflecting an electron beam in a horizontal direction, and (b) a vertical deflection coil for deflecting an electron beam in a vertical direction. It comprises a deflection coil and (c) a core made of, for example, ferrite. At this time, the horizontal deflection coil is wound so as to form a pincushion type magnetic field distribution, and the vertical deflection coil is wound so as to form a barrel type magnetic field distribution. With such a magnetic field distribution, self-convergence that can eliminate the need for a convergence correction circuit can be realized, and the cost of the television set or the display device can be reduced by the amount that the convergence correction circuit is unnecessary.

FIG. 10 is an exploded perspective view for explaining a first conventional deflection yoke 101P. As shown in FIG. 10, a deflection yoke 101P sandwiches a bobbin 10P having a plastic resin tubular body 10 as a base material between two separators 201P and 202P.
01P and 202P are sandwiched between two cores 301P and 302P. Bobbin 10P and separator 2
01P and 202P are made of, for example, a plastic resin.
In order to avoid complication of the drawing, a horizontal deflection coil wound between the ribs 11 and 12 of the bobbin 10P inside the bobbin 10P and the rib 211 of the separator 201P are provided.
P, 221P and the rib 2 of the separator 202P.
The illustration of the vertical deflection coil wound around the bobbin 10P between 12P and 222P is omitted. The horizontal deflection coil and the vertical deflection coil are the separators 201P and 201P.
They are separated from each other and positioned by 2P.

In recent years, there has been a demand for a display device capable of displaying images and characters with high definition and a flat display surface or panel surface. Accordingly, the cathode ray tube is required to have improved deflection distortion and convergence quality, and is required to have improved deflection yoke assembly accuracy. In addition, demands for cost reduction have been increasing, and a one-way assembly type deflection yoke has been devised to satisfy these two requirements. Such a deflection yoke will be described below as a second conventional deflection yoke 102P.

FIG. 11 is an exploded perspective view for explaining the deflection yoke 102P. In order to avoid complication of the drawing, illustration of the horizontal deflection coil and the vertical deflection coil is omitted in FIG. 11 (described later). As shown in FIG. 11, the core 30 of the deflection yoke 102P has a cylindrical shape in which the cores 201P and 202P of FIG. 10 described above are integrated. Resin component 33 having ribs 31 formed in the opening of core 30
A resin component 34 on which a rib 32 is formed is attached, and a vertical deflection coil (not shown) is wound inside the core 30 between the ribs 31 and 32. Core 3
0, the bobbin 10P is inserted into the deflection yoke 10
2P is configured.

Next, FIGS. 12 to 14 show horizontal deflection coils 1.
5A and 5B are an external view and a vertical cross-sectional view for explaining FIG. In addition,
FIG. 13 shows the horizontal deflection coil 15 from the side of arrow A in FIG.
The vertical sectional view of FIG. 14 shows only the components necessary for the following description. As shown in FIGS. 13 and 14, the bobbin 10P or the cylindrical body 10
A plurality of ribs 13 are formed on the inner wall surface along the direction connecting the ribs 11 and 12. The horizontal deflection coil 15 (the coil wire thereof) is arranged between the adjacent ribs 13, and the arrangement position is regulated by the ribs 13. In FIG. 13, only the upper side of the horizontal deflection coil 15 is illustrated toward the paper surface, and the lower side of the horizontal deflection coil 15 is not illustrated because it is wound in the same manner as the upper side to avoid complication of the drawing. are doing.

FIGS. 15 and 16 are external views for explaining the vertical deflection coil 35. FIG. FIG. 16 corresponds to a view of the vertical deflection coil 35 and the like viewed from the side of the arrow B in FIG. As shown in FIGS. 15 and 16, the vertical deflection coil 35 is wound directly inside the core 30 between the ribs 31 and 32 and along the inner wall surface of the core 30. The core 30 is provided on the inner wall surface thereof with the rib 13 described above.
(See FIG. 14 and the like).

FIG. 17 is a cross-sectional view for explaining the deflection yoke 102P. The bobbin 10P in FIG.
This corresponds to the case where the cross section taken along the line II in FIG. 2 is viewed from the direction of the arrow. In FIG. 17, the core 30 is shown by a broken line. Positioning part 1 on outer wall surface 10S1 of bobbin 10P
9, the central axes of the core 30 and the bobbin 10P are aligned. In FIG. 12 and the like, illustration of the positioning unit 19 is omitted.

[0009]

Since the deflection frequency increases as the definition of an image or a character advances, the definition of the display in the cathode ray tube causes a significant rise in the temperature of the deflection coil. When the temperature of the deflecting coil rises, deformation of the plastic resin or the like or expansion and contraction of the coil wire occurs, so that the position of the deflecting coil (the coil wire) changes, and convergence changes. As a result, the display quality of the cathode ray tube and the display device is deteriorated.

At this time, the above-mentioned position fluctuation tends to occur more easily in the vertical deflection coil 35, and therefore, a change in convergence due to a change in the vertical deflection magnetic field distribution tends to appear. This is because the position of the horizontal deflection coil 15 (coil wire) is regulated by the ribs 11, 12, and 13 of the bobbin 10, whereas the vertical deflection coil 35 (coil wire) is attached to each of the resin parts 33 and 34. Each formed rib 3
This is because it is only stretched between 1 and 32. That is, since the core 30 does not have a structure corresponding to the rib 13 of the bobbin 10 as described above, the vertical deflection coil 35 is more likely to change its position than the horizontal deflection coil 15.

Then, it seems that a structure corresponding to the rib 13 may be provided on the inner wall surface 30S2 of the core 30. However, since the core 30 is a fired part and the inner wall surface 30S2 of the core 30 is formed very smooth, it is difficult to form ribs and the like.

The present invention has been made in view of the above points, and a first object of the present invention is to provide a deflection yoke bobbin capable of suppressing the above-described positional fluctuation of a vertical deflection coil (coil wire rod) in a deflection yoke. Aim.

It is a second object of the present invention to provide a deflection yoke which achieves the first object and can reduce a change in convergence caused by the position fluctuation.

A third object of the present invention is to provide a cathode ray tube and a display device capable of displaying high quality even at the time of high definition display.

[0015]

According to a first aspect of the present invention, there is provided a deflection yoke bobbin having a tubular body, wherein a horizontal deflection coil is wound inside the tubular body. A bobbin for controlling the position of the vertical deflection coil in contact with a vertical deflection coil disposed outside the deflection yoke bobbin, on the outer wall surface of the tubular body. Features.

(2) The bobbin for a deflection yoke according to the invention of the second aspect is the bobbin for the deflection yoke according to the first aspect, wherein the winding restricting portion is provided on the outer wall surface of the cylindrical body. And a conical projection protruding from the projection.

(3) The bobbin for a deflection yoke according to the invention described in claim 3 is the bobbin for deflection yoke according to claim 1 or 2, wherein the winding restriction portion is formed in a circular shape of the cylindrical body. It is characterized by including a sawtooth-shaped projection formed along the circumference.

(4) The bobbin for a deflection yoke according to the invention described in claim 4 is the bobbin for deflection yoke according to any one of claims 1 to 3, wherein the winding restriction section is provided with the vertical deflection. It is characterized by including a plate-like projection arranged along the extension direction of the coil wire of the coil.

(5) A deflection yoke according to a fifth aspect of the present invention is the deflection yoke bobbin according to any one of the first to fourth aspects, and the deflection yoke bobbin is provided inside the cylindrical body. A deflecting yoke comprising: a wound horizontal deflection coil; a cylindrical core into which the deflection yoke bobbin can be inserted; and a vertical deflection coil wound inside the cylindrical inside of the core. A bobbin is inserted into the inside of the core.

(6) A cathode ray tube according to a sixth aspect of the present invention includes the deflection yoke according to the fifth aspect.

(7) A display device according to a seventh aspect of the present invention includes the cathode ray tube according to the sixth aspect.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS <First Embodiment> A deflection yoke 100A and a bobbin (bobbin for deflection yoke) 10A according to a first embodiment will be described with reference to FIGS. FIG. 1 is an external view for explaining the bobbin 10A, and FIGS. 2 and 3 are a cross-sectional view and an enlarged cross-sectional view of the deflection yoke 100A. Further, the bobbin 10A in FIG. 2 corresponds to a cross section taken along line II in FIG. 1 when viewed from the direction of the arrow, and the core 30 is illustrated by a broken line in FIGS. 2 and 3. Further, the horizontal deflection coil 15 and the vertical deflection coil 35 are shown only in FIG. 3 because they have the same configuration as the conventional one and in order to avoid complication of the drawing.

Since the deflection yoke 100A is characterized by the bobbin 10A, the following description will focus on this point, and the same components as those in the prior art are denoted by the same reference numerals. The cylindrical core 30 into which the bobbin 10A is inserted contains a magnetic material such as ferrite, for example. A plastic resin part 3 having a rib 31 is provided on the core 30 as in the conventional case.
3 and a resin part 34 having a rib 32 are attached, and the inner wall surface 30 of the core extends between the ribs 31 and 32.
Along the S2, a vertical deflection coil 35 is wound inside the core 30, for example, in a saddle shape. The vertical deflection coil 35 may be wound in a so-called toroidal shape.

The bobbin 10A includes a cylindrical body 10 made of, for example, a plastic resin as a base material. The tubular body 10 has a shape along the contour of the mounting portion of the cathode ray tube (not shown), and the cathode ray tube 10 is attached to the cathode ray tube and has a cathode ray tube 10 The opening 10K2 facing the display surface side of the tube has a larger opening. Specifically, it has a trumpet shape or a morning glory shape. Further, the core 30 has a shape corresponding to the shape of the bobbin 10A, and has a dimension inside which the bobbin 10A can be inserted.

As with the conventional bobbin 10P, the cylindrical body 10
Are the ribs 1 formed in the openings 10K1 and 10K2.
1 and 12 and a rib 13 formed on the inner wall surface 10S2 of the tubular body 10. Rib 1 on the inside of cylindrical body 10
A horizontal deflection coil 15 is wound, for example, in a saddle shape, between the adjacent ribs 13 and between the adjacent ribs 13.

In particular, the bobbin 10A has a plurality of conical projections (winding regulating portions) 50A protruding from the outer wall surface 10S1 on the outer wall surface 10S1 of the tubular body 10. At this time, as shown in FIG.
That is, when the bobbin 10A is inserted inside the core 30, the protrusion 50A is in contact with (the coil wire of) the vertical deflection coil 35 (disposed on the outside of the bobbin 10A). It is in contact with the inner wall surface 30S2 of the core 30 through a gap of 35 (coil wire). Thereby, the arrangement position of (the coil wire of) the vertical deflection coil 35 can be regulated by the protrusion 50A. Of course, even with the deflection yoke 100A, the advantages of the one-way assembly type deflection yoke can be obtained.

Second Embodiment Next, a deflection yoke 100B and a bobbin 10B according to a second embodiment will be described with reference to FIGS. 4 to 6 correspond to FIGS. 1 to 3, respectively.

As can be seen by comparing FIGS. 4 to 6 with FIGS. 1 to 3 described above, the bobbin 10B is replaced with the protrusion 10A of the bobbin 10A, and is sawed on the outer wall surface 10S1 of the cylindrical body 10. It has a plurality of projections (winding restricting portions) 50B corresponding to the shape of teeth or the teeth of gears. For details,
The saw-toothed projection 50B is formed on the outer wall surface 10 of the cylindrical body 10.
It is formed on S1 along the circumference of the cylindrical body 10, and is provided on a plurality of circumferences. Here, “circumference” refers to the outer wall surface 10S1 of the tubular body 10 and the outer wall surface 10S1
The line of intersection with any plane that intersects 1 In addition, unlike FIG. 4, the protrusion 50B may be formed on a circumference defined when the above-mentioned arbitrary plane is inclined with respect to the central axis of the tubular body 10.

At this time, as shown in FIG. 6, in a state where the bobbin 10B is inserted inside the core 30, the projection 50B is placed (located outside the bobbin 10B) similarly to the above-described projection 50A (see FIG. 3). ) And the inner wall surface 30S2 of the core 30. For this reason, the vertical deflection coil 3 is also provided by the projection 50B.
5 (the coil wire) can be restricted.

Third Embodiment Next, a deflection yoke 100C and a bobbin 10C according to a third embodiment will be described with reference to FIGS. 7 to 9 correspond to FIGS. 1 to 3, respectively.

As can be seen from a comparison between FIGS. 7 to 9 and FIGS. 1 to 3 described above, the bobbin 10C is replaced by a projection 10A of the bobbin 10A, and a plate is provided on the outer wall surface 10S1 of the cylindrical body 10. It has a plurality of projections (winding regulating portions) 50C. Specifically, the projection 50C is formed on the outer wall surface 10S1 of the tubular body 10 along the direction connecting the openings 10K1 and 10K2. In other words, the protrusion 50C is arranged along the direction in which the coil wire of the vertical deflection coil 35 extends in the deflection yoke 100C.

At this time, as shown in FIG. 9, in a state where the bobbin 10C is inserted inside the core 30, the projection 50C is placed (located outside the bobbin 10C) similarly to the above-described projection 50A (see FIG. 3). ) And the inner wall surface 30S2 of the core 30. For this reason, the vertical deflection coil 3 is also provided by the projection 50C.
5 (the coil wire) can be restricted.

In particular, while the protrusions 50A and 50B are scattered in a point shape, the protrusion 50C extends linearly (with respect to the point shape) along the coil wire of the vertical deflection coil 35. Therefore, the vertical deflection coil 35 can be more reliably regulated as compared with the protrusions 50A and 50B.

<Summary> As described above, the bobbins 10A-
According to 10C, in the deflection yokes 100A to 100C, it is possible to suppress a change in the arrangement position of the vertical deflection coil 35 due to a temperature rise (and further due to other factors). Therefore, according to the cathode ray tube provided with the deflection yokes 100A to 100C and the display device provided with the cathode ray tube, a change in convergence caused by a position change of the vertical deflection coil 35 is reduced, and a high quality display can be obtained. Can be.

The above-described effect can be obtained even if two or all of the projections 50A to 50C are provided at the same time. Also, as long as the arrangement position of the vertical deflection coil 35 can be regulated by the projections 50A to 50C, the projection 50A is not necessarily required.
The tip of て も 50C may not be in contact with the inner wall surface 30S2 of the core 30.

[0036]

(1) According to the first aspect of the present invention, the winding restricting portion comes into contact with the vertical deflection coil to restrict the position of the (vertical deflection coil). Therefore, it is possible to provide a deflection yoke in which a change in the arrangement position of the vertical deflection coil due to a temperature rise or the like is suppressed.

(2) According to the second aspect of the invention, the same effect as the above (1) can be obtained.

(3) According to the third aspect of the invention, the same effect as the above (1) can be obtained.

(4) According to the fourth aspect of the present invention, the plate-like projections (winding regulating portions) are arranged along the extending direction of the coil wire of the vertical deflection coil. For this reason, the vertical deflection coil can be more reliably regulated as compared with the case where the dotted projections are scattered. Therefore, the effect (1) can be more reliably obtained.

(5) According to the fifth aspect of the invention, it is possible to provide a cathode ray tube in which a change in the arrangement position of the vertical deflection coil is suppressed, and a change in convergence caused by the change is reduced.

(6) According to the sixth aspect of the present invention, it is possible to provide a cathode ray tube capable of reducing a change in the convergence and enabling a high-quality display even in a high-definition display.

(7) According to the seventh aspect of the present invention, it is possible to provide a display device in which the above-mentioned change in convergence is reduced and high-quality display is possible even during high-definition display.

[Brief description of the drawings]

FIG. 1 is an external view for explaining a deflection yoke bobbin according to a first embodiment.

FIG. 2 is a cross-sectional view illustrating a deflection yoke according to the first embodiment.

FIG. 3 is an enlarged cross-sectional view for explaining the deflection yoke according to the first embodiment.

FIG. 4 is an external view for explaining a deflection yoke bobbin according to a second embodiment.

FIG. 5 is a cross-sectional view for explaining a deflection yoke according to a second embodiment.

FIG. 6 is an enlarged cross-sectional view for explaining a deflection yoke according to a second embodiment.

FIG. 7 is an external view for explaining a deflection yoke bobbin according to a third embodiment.

FIG. 8 is a cross-sectional view illustrating a deflection yoke according to a third embodiment.

FIG. 9 is an enlarged cross-sectional view illustrating a deflection yoke according to a third embodiment.

FIG. 10 is an exploded perspective view for explaining a first conventional deflection yoke.

FIG. 11 is an exploded perspective view for explaining a second conventional deflection yoke.

FIG. 12 is an external view for explaining a horizontal deflection coil of a second conventional deflection yoke.

FIG. 13 is an external view for explaining a horizontal deflection coil of a second conventional deflection yoke.

FIG. 14 is a longitudinal sectional view for explaining a horizontal deflection coil of a second conventional deflection yoke.

FIG. 15 is an external view illustrating a vertical deflection coil of a second conventional deflection yoke.

FIG. 16 is an external view for explaining a vertical deflection coil of a second conventional deflection yoke.

FIG. 17 is a cross-sectional view for explaining a second conventional deflection yoke.

[Explanation of symbols]

Reference Signs List 10 cylindrical body, 10A to 10C bobbin (bobbin for deflection yoke), 10S1 outer wall surface, 10S2 inner wall surface, 15
Horizontal deflection coil, 30 cores, 30S2 inner wall surface, 35
Vertical deflection coil, 50A to 50C Projection (winding restricting portion), 100A to 100C Deflection yoke.

Claims (7)

[Claims] 1. A deflection yoke bobbin having a tubular body and having a horizontal deflection coil wound inside the tubular body, wherein the bobbin is in contact with a vertical deflection coil disposed outside the deflection yoke bobbin. A bobbin for a deflection yoke, wherein a winding restricting portion for restricting an arrangement position of the vertical deflection coil is provided on an outer wall surface of the cylindrical body. 2. The deflection yoke bobbin according to claim 1, wherein the winding restricting portion includes a conical protrusion protruding from the outer wall surface of the cylindrical body. Bobbin for yoke. 3. The bobbin for a deflection yoke according to claim 1, wherein the winding restricting portion includes a saw-toothed projection formed along a circumference of the cylindrical body. Characteristic, bobbin for deflection yoke. 4. The bobbin for a deflection yoke according to claim 1, wherein the winding restricting portion is a plate-shaped member arranged along an extending direction of a coil wire of the vertical deflection coil. A bobbin for a deflection yoke, comprising: 5. The deflection yoke bobbin according to any one of claims 1 to 4, a horizontal deflection coil wound inside the cylindrical body of the deflection yoke bobbin, and the deflection inside the deflection coil. A cylindrical core into which a yoke bobbin can be inserted; and a vertical deflection coil wound inside the core of the core, wherein the deflection yoke bobbin is inserted into the core. A deflection yoke. 6. A cathode ray tube comprising the deflection yoke according to claim 5. 7. A display device comprising the cathode ray tube according to claim 6.