JP3932986B2 - Color picture tube device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a color picture tube apparatus used for a television, a computer display, etc., and 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. A plurality of convex portions 18 projecting substantially toward the Z axis (center 0) are provided on the inner surface of the ferrite core 17 of the deflection yoke, and the vertical coil 19 and the horizontal coil 20 are insulated from each other between the adjacent convex portions 18. 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 brought closer to the picture tube as compared with a normal deflection yoke having no projection. In addition, the magnetic flux hardly interlinks with the coil, eddy current loss is reduced, and 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 the color picture tube has a circular shape with the neck portion rounded and the other portions rounded as a whole, or a rectangular shape with rounded corners (hereinafter, “abbreviated” In general, a technique for reducing the deflection power by reducing the distance between the deflection yoke and the electron beam is called “rectangular”.
[0004]
FIG. 4 shows a Z-axis sectional view of a deflection yoke using a slot core, which is attached to a substantially rectangular funnel. In accordance with the outer shape of the funnel, the cross-sectional shapes of the horizontal coil 12, the vertical coil 13, and the ferrite core 14 of the deflection yoke are also substantially rectangular. A plurality of convex portions 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 convex portion 21 and the envelope of the groove portion 15 between the convex portions 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 the horizontal axis (X axis), the vertical axis (Y axis), and the diagonal axis. It consists of a combination of RL, RS, and RD. Compared to a circular shape centered on the Z axis 0, the design is more complicated.
[0006]
[Problems to be solved by the invention]
In the case of a slot core having a substantially rectangular Z-axis cross section, the shrinking direction at the time of forming a ferrite core is geometrically complicated as compared with a conventional circular core. Therefore, the dimensional stability is worse than that of a circular shape, and there is a problem that image characteristic variation is more likely to occur.
[0007]
The present invention has been made to solve such problems. Even when the Z-axis cross section is a substantially rectangular slot core, the dimensional stability at the time of forming the ferrite core can be maintained, and there is little variation in image characteristics. An object is to provide a color picture tube.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, in the color picture tube apparatus of the present invention, a panel having a phosphor screen surface formed on the inner surface and a funnel constitute an envelope, and an electron gun is provided in the neck portion of the funnel. A color picture tube device in which a deflection yoke is provided 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 the ferrite core protrudes toward the tube axis of the color picture tube device and has a longitudinal direction along a plane including the tube axis. A plurality of convex portions provided, a groove portion between the convex portions, and a groove portion between the convex portions, and an inner surface shape of a cross section perpendicular to the tube axis of the ferrite core, the envelope of the groove portion is a circle And the envelope of the tip of the convex portion forms a circle on the electron gun side, has a substantially rectangular shape on the screen side, and has a cross-sectional shape perpendicular to the tube axis of the funnel. A circular shape is used, and a portion other than the neck portion is a rectangle with rounded corners (Claim 1).
[0009]
With this configuration, the dimensional stability at the time of molding the ferrite core can be maintained even with the slot core.
[0010]
In addition, at least one of a horizontal coil and a vertical coil is wound around the groove, and the inner surface shape of the cross section perpendicular to the tube axis of the horizontal coil or the vertical coil forms a circle on the electron gun side, and on the screen side. It is substantially rectangular (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]
DETAILED DESCRIPTION OF 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 apparatus of the present invention. In the color picture tube device, a front flat panel 1 having a phosphor screen surface formed on the inner surface and a funnel 2 constitute an envelope, an electron gun 3 is installed in the neck portion of the funnel 2, and the funnel 2 has an outer surface. A deflection yoke 4 and a 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. It is a cross section in a plane parallel to the screen surface in a region including the ferrite core 9, and is a cross section on the screen surface side where the outer shape of the funnel is substantially rectangular. X represents a horizontal axis, and Y represents a vertical axis. The axis that intersects at right angles to both axes at 0 where both axes intersect is the Z axis (tube axis). The deflection yoke 4 includes a saddle type horizontal coil 6, a vertical coil 7, an insulating spacer 8 for insulating the horizontal coil 6 and the vertical coil 7, and a ferrite core 9. The cross section of each coil is hatched for simplicity.
[0015]
Protrusions 51 projecting toward the Z axis 0 are provided at equal intervals on the inner surface of the ferrite core 9. The convex portion 51 is provided in a region extending from the electron gun side end of the ferrite core 9 to the screen side end along a plane including the Z axis. In the present embodiment, a total of 20 pieces are provided every 18 °. Between the adjacent convex parts 51 is the groove part 10.
[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 “substantially rectangular” refers to a rectangle with a rounded shape as a whole, a rectangle with rounded corners, 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 with the Z axis as the center.
[0017]
On the other hand, on the electron gun side (neck portion) having a circular funnel outer shape, the horizontal coil, the vertical coil, the convex portion, and the groove portion 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 portion 10 has a circular shape centered on the Z axis, the shrinkage dimension at the time of molding the ferrite core is stabilized. A tolerance dimension of 0.2 mm can be realized. The groove 15 shown in FIG. 3 having a substantially rectangular shape has a tolerance dimension of 0.3 mm, and therefore, according to the present invention, image characteristic variation is reduced. Further, the distance between the electron beam and the coil and the ferrite core can be reduced, and the maximum reduction effect can be obtained as the deflection power. Further, the deflection power is increased by about 3% compared to the conventional one shown in FIG.
[0019]
【The invention's effect】
As described above, according to the present invention, the Z-axis cross-sectional shape of the funnel is substantially rectangular, and even if it is a slot core, dimensional stability at the time of ferrite core molding can be maintained, It is possible to provide a low deflection power, a low heat generation deflection yoke and a color picture tube apparatus with little variation in image characteristics.
[Brief description of the drawings]
1 is a side view of a color picture tube. FIG. 2 is a Z-axis cross-sectional view of a deflection yoke according to the present invention. FIG. 3 is a Z-axis cross-sectional view of a conventional slot core having a circular cross section. Z-axis sectional view of the 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 part 11 Convex envelope 51 Convex part

Claims (2)

A color picture tube device in which a panel having a phosphor screen surface formed on the inner surface and a funnel constitute an envelope, an electron gun is provided in the neck portion of the funnel, and a deflection yoke is provided on the outer surface of the funnel. There,
The deflection yoke includes a ferrite core, a horizontal coil and a vertical coil wound around the ferrite core, and an insulator for insulating the horizontal coil and the vertical coil.
The ferrite core has, on the inner surface thereof, a plurality of protrusions that protrude toward the tube axis of the color picture tube device and that have a longitudinal direction along a plane including the tube axis. Having a groove between the part and the convex part,
The inner surface shape of the cross section perpendicular to the tube axis of the ferrite core is such that the envelope of the groove portion forms a circle, the envelope of the tip of the convex portion forms a circle on the electron gun side, and on the screen side It is almost rectangular,
The shape of the tube axis perpendicular cross-section of the funnel, a neck portion is circular, a color picture tube apparatus being characterized in that the rectangular corner portions other than the neck portion is rounded. At least one of a horizontal coil and a vertical coil is wound around the groove,
2. The color picture tube according to claim 1, wherein an inner shape of a cross section perpendicular to the tube axis of the horizontal coil or the vertical coil is a circle on the electron gun side and a substantially rectangular shape on the screen side. apparatus.

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