JP2004014349A - Color picture tube equipment - Google Patents

Abstract

The present invention provides a color picture tube which can maintain dimensional stability during molding of a ferrite core even with a slot core having a substantially rectangular Z-axis cross section and which has little variation in image characteristics.
A ferrite core (9) of a deflection yoke (4) has on its inner surface a plurality of protrusions (51) that protrude toward the Z-axis and whose longitudinal direction is provided along a plane including the Z-axis. The ferrite core 9 has a groove 10 between the protrusions 51, and the inner shape of the cross section perpendicular to the Z axis is such that the envelope of the groove 10 is circular, and the envelope of the tip of the protrusion 51 is an electron. The gun has a circular shape and the screen has a substantially rectangular shape.
[Selection] Fig. 2

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a color picture tube device used for a television, a computer display, and the like, and relates to a structure of a magnetic core used for a deflection yoke.
[0002]
[Prior art]
FIG. 3 shows a Z-axis cross section of a ferrite core generally called a slot core. On the inner surface of the ferrite core 17 of the deflection yoke, a plurality of projections 18 projecting substantially toward the Z axis (center 0) are provided, and the vertical coil 19 and the horizontal coil 20 are insulated in the groove between the adjacent projections 18. The winding is performed via the spacer 31. This technique is disclosed in Japanese Utility Model Laid-Open No. 61-56757. The slot core is advantageous in terms of deflection sensitivity because the ferrite core can be closer to the picture tube than a normal deflection yoke having no projection. In addition, the magnetic flux does not easily interlink with the coil, the eddy current loss is reduced, and the heat generation of the deflection yoke can be reduced.
[0003]
In recent years, the shape of the cross section perpendicular to the Z axis of the funnel of a color picture tube has a neck portion of a circular shape and other portions as a whole have a rounded rectangle or a corner portion has a rounded rectangle (hereinafter referred to as “substantially”). A technique of reducing the deflection power by shortening the distance between the deflection yoke and the electron beam by using a rectangular shape is called.).
[0004]
FIG. 4 shows a Z-axis sectional view of a deflection yoke using a slot core, which is mounted on a substantially rectangular funnel. The cross-sectional shape of each of the horizontal coil 12, vertical coil 13, and ferrite core 14 of the deflection yoke is also substantially rectangular according to the outer shape of the funnel. A plurality of protrusions 21 are provided on the inner surface of the ferrite core 14, and the envelope 16 (shown by a broken line) at the tip of the protrusion 21 and the envelope of the groove 15 between the protrusions 21 are also substantially rectangular.
[0005]
As shown in FIG. 4, the substantially rectangular shape formed by the groove 15 on the inner surface of the ferrite core 14 has three arcs each having a center on a horizontal axis (X axis), a vertical axis (Y axis), and a diagonal axis. It consists of a combination of RL, RS and RD. It has a more complicated geometrical design than a circular one centered on the Z axis 0.
[0006]
[Problems to be solved by the invention]
In the case of a slot core having a substantially rectangular Z-axis cross section, the contraction direction during molding of a ferrite core becomes geometrically more complicated than that of a conventional circular core. Therefore, there is a problem that the dimensional stability is worse than that of a circular shape, and the image characteristics are more likely to vary.
[0007]
The present invention has been made in order to solve such a problem, and can maintain dimensional stability at the time of molding a ferrite core even when the slot core has a substantially rectangular Z-axis cross section, and has less variation in image characteristics. It is an object to provide a color picture tube.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the color picture tube device of the present invention is configured such that a panel having a phosphor screen surface formed on an inner surface thereof and a funnel constitute an envelope, and an electron gun is provided in a neck portion of the funnel. A color picture tube device provided with a deflection yoke on the outer surface of the funnel, wherein the deflection yoke includes a ferrite core, a horizontal coil and a vertical coil wound around the ferrite core, and the horizontal coil and the vertical coil. And a plurality of protrusions provided on the inner surface of the ferrite core so as to protrude toward the Z-axis and have a longitudinal direction along a plane including the Z-axis. Having a groove between the protrusions, the inner surface shape of a cross section perpendicular to the Z axis of the ferrite core is such that the envelope of the groove forms a circle, At the tip絡線 is a circle with an electron gun side, characterized in that a substantially rectangular screen side (claim 1).
[0009]
With this configuration, it is possible to maintain the dimensional stability during molding of the ferrite core even for a slot core.
[0010]
Further, at least one of a horizontal coil and a vertical coil is wound in the groove, and the inner surface shape of a cross section perpendicular to the Z axis of the horizontal coil or the vertical coil forms a circle on the electron gun side and is substantially on the screen side. It has a rectangular shape (claim 2).
[0011]
With this configuration, the distance from the electron beam can be reduced, and the horizontal deflection power and the vertical deflection power can be reduced to the maximum.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
[0013]
FIG. 1 is a side view of a color picture tube device of the present invention. In the color picture tube device, a front flat panel 1 having a phosphor screen surface formed on an inner surface thereof and a funnel 2 constitute an envelope. An electron gun 3 is installed in a neck portion of the funnel 2. The deflection yoke 4 and the convergence yoke 5 are mounted.
[0014]
FIG. 2 shows a cross section perpendicular to the Z axis of the deflection yoke 4 according to the present invention. This is a cross-section on a plane parallel to the screen surface in a region including the ferrite core 9 and a cross-section on the screen surface side where the outer shape of the funnel is substantially rectangular. X indicates a horizontal axis, and Y indicates a vertical axis. At 0 where both axes intersect, the axis which intersects both axes at right angles is the Z axis (tube axis). The deflection yoke 4 includes a saddle-shaped horizontal coil 6, a vertical coil 7, an insulating spacer 8 for insulating the horizontal coil 6 from the vertical coil 7, and a ferrite core 9. The cross section of each coil is shown by hatching for simplification.
[0015]
On the inner surface of the ferrite core 9, convex portions 51 protruding toward the Z axis 0 are provided at equal intervals. The convex portion 51 is provided along a plane including the Z axis in a region from the electron gun side end to the screen side end of the ferrite core 9. In the present embodiment, a total of 20 pieces are provided every 18 °. The groove 10 is provided between the adjacent protrusions 51.
[0016]
As shown in FIG. 2, the envelope 11 (shown by a broken line) at the tip of the convex portion 51 is a substantially rectangular shape that matches the outer shape of the funnel. The term “substantially rectangular” refers to a rectangle having a rounded shape as a whole, a rectangle having a rounded corner, or the like. The envelopes on the inner surface side (funnel side) of the horizontal coil 6, the vertical coil 7, and the insulating spacer 8 are also substantially rectangular. On the other hand, the envelope of the groove 10 of the ferrite core 9 has a circular shape centered on the Z axis.
[0017]
On the other hand, on the electron gun side (neck portion) where the funnel outer shape is circular, the envelopes of the horizontal coil, the vertical coil, the projection, and the groove are all circles centered on the Z axis, as shown in FIG. It has a shape.
[0018]
With such a configuration, since only the envelope of the groove 10 has a circular shape centered on the Z-axis, the shrinkage dimension during molding of the ferrite core is stable. 0.2 mm can be realized as the tolerance dimension. Since the groove 15 shown in FIG. 3 having a substantially rectangular shape has a tolerance of 0.3 mm, the present invention reduces the variation in image characteristics. Further, the distance between the electron beam, the coil and the ferrite core can be reduced, and the maximum effect of reducing the deflection power can be obtained. Further, the deflection power is increased by about 3% as compared with the conventional one shown in FIG.
[0019]
【The invention's effect】
As described above, according to the present invention, the funnel has a substantially rectangular Z-axis cross-sectional shape, and even in the case of a slot core, it is possible to maintain dimensional stability when molding a ferrite core. It is possible to provide a low deflection power, a low heat generation deflection yoke, and a color picture tube device with less variation in image characteristics.
[Brief description of the drawings]
FIG. 1 is a side view of a color picture tube. FIG. 2 is a Z-axis sectional view of a deflection yoke according to the present invention. FIG. 3 is a Z-axis sectional view of a conventional slot core having a circular cross section. FIG. Sectional view of Z-axis of slot core
DESCRIPTION OF SYMBOLS 1 Panel 2 Funnel 3 Electron gun 4 Deflection yoke 6 Horizontal coil 7 Vertical coil 8 Insulating spacer 9 Ferrite core 10 Groove 11 Convex envelope 51 Convex

Claims (2)

A color picture tube device in which a panel having a phosphor screen surface formed on an inner surface and a funnel constitute an envelope, an electron gun is provided in a neck portion of the funnel, and a deflection yoke is provided on an outer surface of the funnel. So,
The deflection yoke includes a ferrite core, a horizontal coil and a vertical coil wound on the ferrite core, and an insulator for insulating the horizontal coil and the vertical coil.
The ferrite core has, on its inner surface, a plurality of protrusions protruding toward the Z-axis and having a longitudinal direction provided along a plane including the Z-axis, between the protrusions. Has a groove,
The inner surface shape of the cross section perpendicular to the Z axis of the ferrite core is such that the envelope of the groove forms a circle, the envelope of the tip of the protrusion forms a circle on the electron gun side, and is substantially on the screen side. A color picture tube device having a rectangular shape. At least one of a horizontal coil and a vertical coil is wound in the groove,
2. The color picture tube device according to claim 1, wherein an inner surface shape of a cross section perpendicular to the Z axis of the horizontal coil or the vertical coil forms a circle on the electron gun side and a substantially rectangular shape on the screen side. .

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