JP2007214021A - Deflection yoke and cathode-ray tube device using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily determine quality of a winding position by an actual product, at a point of time when toroidal winding of a winding of a vertical deflection coil to a core is carried out. <P>SOLUTION: The vertical deflection coil generating a vertical deflection magnetic field in the ferrite core 40 is toroidally wound. A screen side end of the ferrite core is provided with an angle indication mark in a predetermined angle position with respect to an axis. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cathode ray tube apparatus used for a television or a computer display. The present invention also relates to a deflection yoke used in the cathode ray tube apparatus.

  Patent Document 1 discloses a so-called slot core in which a plurality of convex portions projecting toward the tube axis of a cathode ray tube are provided on the inner surface of a ferrite core constituting the deflection yoke in order to reduce deflection power and suppress heat generation of the deflection yoke. Is disclosed.

  Patent Document 2 discloses a deflection yoke in which a vertical deflection coil is wound around a slot core in a toroidal shape, and a horizontal deflection coil wound in a saddle shape is mounted.

  By providing a convex portion on the inner surface of the ferrite core, the ferrite core can be brought closer to the cathode ray tube than in the case where the convex portion is not provided, so that the deflection efficiency can be improved, which is advantageous in reducing the deflection power. In addition, by arranging the windings of the vertical deflection coil and / or horizontal deflection coil in the groove (concave portion) between the convex portions, it is difficult for the magnetic flux to interlink with the windings. And the heat generation of the deflection yoke can be reduced.

  On the other hand, in the slot core, since the position in the circumferential direction of the winding is substantially limited by the position of the groove between the projections, the degree of freedom in winding arrangement is low, and thus the desired deflection There is a problem that it is difficult to obtain a magnetic field distribution.

To solve this problem, as shown in FIG. 6, the convex portion 141 on the inner surface is provided only on the small diameter side (electron gun side) of the slot core 140 and is not provided on the large diameter side (screen side). A deflection yoke has been proposed in which the degree of freedom of winding arrangement on the side is improved (see Patent Document 3).
Japanese Utility Model Publication No. 61-56757 Japanese Utility Model Publication No. 63-9760 No. 7-35289

  However, when the winding is toroidally wound on the slot core 140 shown in FIG. 6, since there is no reference for the winding position on the large diameter side, the winding position is likely to be displaced, and the convergence of the obtained cathode ray tube apparatus is obtained. There is a problem that variations occur in characteristics and the like.

  In addition, the positional deviation of the winding is not found until the image performance is confirmed by toroidally winding the winding around the slot core, assembling the deflection yoke, and mounting it on the cathode ray tube. If a misalignment of the winding is found at this stage, the correction work is complicated.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a deflection yoke that can easily determine whether or not a winding position is good or not when a winding is toroidally wound around a core. It is another object of the present invention to provide a deflection yoke and a cathode ray tube apparatus that can be produced with very stable and high quality.

  The deflection yoke of the present invention includes a ferrite core, a horizontal deflection coil that is wound around the ferrite core and generates a horizontal deflection magnetic field, and a vertical deflection magnetic field that is wound around the ferrite core in a toroidal shape. A deflection coil; and an insulating frame that insulates the horizontal deflection coil and the vertical deflection coil. An angle display mark is provided at a predetermined angular position with respect to the central axis at the screen side end of the ferrite core.

  A cathode ray tube device according to the present invention includes an envelope composed of a front panel and a funnel, a screen formed on the inner surface of the front panel, and a neck portion of the funnel, and transmits an electron beam toward the screen. An electron gun for emitting, and a deflection yoke mounted on an outer peripheral surface of the funnel and deflecting the electron beam in a horizontal direction and a vertical direction. The deflection yoke is the deflection yoke of the present invention.

  According to the present invention, the position accuracy of the winding can be easily confirmed with the actual product immediately after the winding of the vertical deflection coil is toroidally wound. When the winding position deviation is recognized, the winding position deviation correction work is easy. Further, by immediately changing the winding condition of the winding, further generation of defective products can be prevented, and stable production of good products can be made in a short time. Therefore, it is possible to provide a deflection yoke and a cathode ray tube device that can be produced with very efficient and stable quality.

  In the deflection yoke of the present invention, it is preferable that the angle display mark is a reference for a position of a winding of the vertical deflection coil.

  It is preferable that the angle display mark is a marking line.

  Preferably, the inner surface of the ferrite core has a plurality of protrusions arranged in the circumferential direction, and the plurality of protrusions are not formed near the screen side end of the ferrite core.

  Hereinafter, the present invention will be described with reference to embodiments.

  FIG. 1 is a half sectional view showing a schematic configuration of an example of a cathode ray tube apparatus according to the present invention.

  As shown in FIG. 1, the cathode ray tube of the cathode ray tube device includes an envelope in which a front panel 1 having a phosphor screen 1A formed on the inner surface and a funnel 2 are joined. In the neck 3 which is the most detailed part of the funnel 2, there are three electron beams 7 (since the three electron beams 7 are arranged on a straight line in the horizontal direction, only one electron beam in the foreground is shown in the figure. The electron gun 6 is stored. For convenience of the following description, as shown in the figure, the tube axis of such a cathode ray tube is the Z axis, the horizontal axis orthogonal to the Z axis is the X axis, and the vertical axis orthogonal to the X axis and the Z axis is An XYZ orthogonal coordinate system for the Y axis is set.

  A deflection yoke 4 is mounted on the outer peripheral surface of the portion where the outer diameter changes between the junction between the funnel 2 and the front panel 1 and the neck portion 3. The deflection yoke 4 includes a horizontal deflection coil 47, a vertical deflection coil 48, and a ferrite core 40. The horizontal deflection coil 47 emits a horizontal deflection magnetic field substantially along the Y axis, and the vertical deflection coil 48 emits a vertical deflection magnetic field substantially along the X axis. The three electron beams 7 emitted from the electron gun 6 are deflected in the horizontal direction and the vertical direction by the horizontal deflection magnetic field and the vertical deflection magnetic field, and scan on the phosphor screen 1A. A resin insulating frame 49 is provided between the horizontal deflection coil 47 and the vertical deflection coil 48. The insulating frame 49 maintains the electrical insulation state between the horizontal deflection coil 47 and the vertical deflection coil 48 and plays a role of supporting both the deflection coils 47 and 48.

  On the outer peripheral surface of the neck 3, a CPU (Convergence and Purity Unit) 5 for performing static convergence adjustment and purity adjustment of the electron beam at the center of the screen is provided. The CPU 5 includes 2-pole, 4-pole, and 6-pole magnet rings that apply a magnetic field to the electron beam, and is mounted on the outer peripheral surface of the neck portion 3 of the funnel 2 in which the electron gun 6 is built.

  Next, the deflection yoke 4 mounted on the cathode ray tube apparatus of the present invention will be described in more detail.

  FIG. 2 is a perspective view of the ferrite core 40 used in the deflection yoke according to the embodiment of the present invention. The ferrite core 40 is manufactured by baking and solidifying ferrite, which is a magnetic material, so as to have a substantially funnel shape as a whole. Here, “substantially funnel shape” means that the outer diameter and the inner diameter increase (or decrease) from one end to the other end in the central axis direction when viewed macroscopically. Minute protrusions and depressions may exist on the outer peripheral surface, the inner peripheral surface, and the end surface in the central axis direction. The ferrite core 40 is mounted on the cathode ray tube with its central axis coinciding with the tube axis (Z axis) of the cathode ray tube. Therefore, hereinafter, the central axis of the ferrite core 40 is referred to as a Z-axis. FIG. 2 also shows the XYZ axes of the cathode ray tube on which the ferrite core 40 is mounted.

  The ferrite core 40 includes two core halves 40a and 40b that are divided vertically with respect to the XZ plane (the plane including the X axis and the Z axis).

  The ferrite core 40 is a slot core in which a plurality of convex portions 41 are arranged in the circumferential direction (rotating direction around the Z axis) in a region excluding the region on the phosphor screen 1A side (large diameter side) on the inner surface. . Each protrusion 41 protrudes toward the Z axis and has a bowl shape extending in a direction connecting the small diameter side and the large diameter side of the ferrite core 40.

  FIG. 3 is a front view of the ferrite core 40 as viewed from the phosphor screen 1A side (large diameter side). At the phosphor screen 1A side (large diameter side) end of the ferrite core 40, ± 2 °, ± 14 °, ± 20 °, ± 25 °, ± 30 °, ± 34 with respect to the Y axis centering on the Z axis. An angle display mark 42 having a thickness of 1 mm and a depth of 0.5 mm is provided at each position having an angle of °, ± 38 °, and ± 58 °. The angle display mark 42 can be formed, for example, by transferring a marking line provided on a mold used when the ferrite core 40 is molded.

  FIG. 4 is a front view of the core half 40a around which the vertical deflection coil 48 is wound as viewed from the phosphor screen 1A side (large diameter side). Since the core half 40a and the core half 40b are substantially symmetrical with respect to the Z axis, including the winding arrangement of the vertical deflection coil 48 wound thereon, the core half 40a will be described below.

  Windings (for example, copper wires) of the vertical deflection coil 48 are divided into eight groups having different angles with respect to the Y axis, and are wound at predetermined positions on the core half 40a. That is, the eight groups of windings are arranged in the eight grooves between the adjacent convex portions 41 in the region where the convex portions 41 are formed in the Z-axis direction, and the phosphor screen 1A side (large diameter side) end. Then, it arrange | positions so that it may be settled in eight area | region +/- I-IV from which the angle with respect to a Y-axis differs. As for the first quadrant, the angle ranges of the regions I, II, III, and IV with respect to the Y axis are 2 ° to 14 °, 20 ° to 25 °, 30 ° to 34 °, and 38 ° to 58 ° in this order. . The winding arrangement of the vertical deflection coil 48 is symmetric with respect to the YZ plane (a plane including the Y axis and the Z axis).

  After the vertical deflection coil 48 is toroidally wound around each of the core halves 40a and 40b, the core half 40a and the core half 40b are combined.

  In actual production, the automatic winding machine is used to set conditions so that the windings are arranged as shown in FIG. 4, and the winding of the vertical deflection coil 48 is toroidally wound around the core half 40a. The At this time, in the region where the convex portion 41 is formed in the Z-axis direction, the winding position is regulated by fitting the winding in the groove between the adjacent convex portions 41, so the positional accuracy of the winding is compared. Good. On the other hand, in the region on the phosphor screen 1A side (large diameter side) where the convex portions 41 are not formed, the winding position is likely to vary. This variation occurs due to, for example, an error in the accuracy of attaching the core half 40a to the automatic winding machine, a variation in winding diameter, or the like.

  FIG. 5 is a front view showing an example of a core half 40a in which the winding of the vertical deflection coil 48 is displaced in the toroidal manner at the phosphor screen 1A side (large diameter side) end. In this example, at the phosphor screen 1A side (large diameter side) end, all the positions of the eight groups of windings of the vertical deflection coil 48 are shifted in the clockwise direction with respect to the design position.

  Conventionally, there is no way to detect such misalignment of the winding of the vertical deflection coil 48 at the stage immediately after the winding of the core half is finished. The deflection yoke 4 is assembled and attached to the cathode ray tube. In the inspection process for confirming the quality of the image displayed on the screen. When it was confirmed that the image quality defect was caused by the positional deviation of the winding, the position and orientation of the winding were finely adjusted while viewing a misconvergence pattern called a rotation component on the screen. After mounting the deflection yoke 4 on the cathode ray tube, the operation of correcting the positional deviation of the winding of the vertical deflection coil 48 while looking at the screen is very complicated and requires a lot of time.

  In the present invention, eight regions in which eight groups of windings of the vertical deflection coil 48 are respectively arranged at the phosphor screen 1A side (large diameter side) end of the core half body 40a where the winding position is likely to be displaced. Angle display marks 42 are provided at both end positions of ± I to ± IV. Accordingly, by confirming the position of the winding of the vertical deflection coil 48 with respect to the angle display mark 42, it is possible to easily and quickly detect the presence / absence of the position of the winding. Since the angle display mark 42 is formed on the end face in the Z-axis direction of the core half 40a, visual confirmation is easy. For example, in the case of FIG. 5, one of the pair of angle display marks 42 formed at both end positions of each region where the winding is to be disposed is exposed and the other is hidden by the winding. It can be confirmed that the winding position is shifted. When the deviation of the winding position is confirmed, the position of the winding can be immediately corrected with reference to the position of the angle display mark 42. Further, by changing the conditions regarding the position and angle of the winding set in the automatic winding machine, further generation of defective products can be prevented, and stable production can be shifted in a short time.

  In the above embodiment, the slot core in which the plurality of convex portions 41 are formed on the inner surface of the ferrite core has been described as an example, but the present invention is not limited to this. For example, even in a ferrite core in which the convex portion 41 is not formed on the inner surface, the position of the winding of the vertical deflection coil 48 that is similarly toroidally wound may be generated, and the present invention provides a deflection yoke having such a ferrite core. It is also effective for cathode ray tube devices.

  In the above embodiment, the angle display mark 42 is a minute concave groove. However, the angle display mark of the present invention is not limited to this, and may have a protruding shape. It may be a shape or various polygons.

  The field of application of the present invention is not particularly limited, and can be used in a wide range of cathode ray tube devices such as a television or a computer display and a deflection yoke attached thereto.

One sectional view of an example of a cathode ray tube apparatus according to the present invention The perspective view of the ferrite core used for the deflection | deviation yoke which concerns on one Embodiment of this invention. The front view seen from the large diameter side of the ferrite core used for the deflection yoke which concerns on one Embodiment of this invention Front view showing a core half of a ferrite core used in a deflection yoke according to an embodiment of the present invention, in which a vertical deflection coil is toroidally wound. The front view which showed an example of the core half of the ferrite core used for the deflection | deviation yoke which concerns on one Embodiment of this invention by which the vertical deflection | deviation coil shifted and toroidally wound Front view of an example of a conventional slot core viewed from the large diameter side

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front panel 1A Phosphor screen 2 Funnel 3 Neck part 4 Deflection yoke 5 CPU
6 Electron gun 7 Electron beam 40 Ferrite cores 40a, 40b Core half body 41 Convex part 42 Angle display mark 47 Horizontal deflection coil 48 Vertical deflection coil 49 Insulation frame

Claims (5)

A ferrite core, a horizontal deflection coil that generates a horizontal deflection magnetic field wound around the ferrite core, a vertical deflection coil that generates a vertical deflection magnetic field wound around the ferrite core in a toroidal shape, and the horizontal deflection A deflection yoke having a coil and an insulating frame that insulates the vertical deflection coil;
An angle display mark is provided at a predetermined angular position with respect to the central axis at the screen side end of the ferrite core.   The deflection yoke according to claim 1, wherein the angle display mark is a reference for a position of a winding of the vertical deflection coil.   The deflection yoke according to claim 1, wherein the angle display mark is a marking line.   2. The deflection yoke according to claim 1, wherein the inner surface of the ferrite core has a plurality of protrusions arranged in a circumferential direction, and the plurality of protrusions are not formed near a screen side end of the ferrite core. An envelope consisting of a front panel and a funnel;
A screen formed on the inner surface of the front panel;
An electron gun housed in the funnel neck and emitting an electron beam toward the screen;
A deflection yoke mounted on the outer peripheral surface of the funnel and deflecting the electron beam in a horizontal direction and a vertical direction;
A cathode ray tube device, wherein the deflection yoke is the deflection yoke according to claim 1.

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