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Ferrite core, deflection yoke, and color picture tube apparatus

A technology of ferrite magnets and cones, which is applied in the field of color picture tube devices, and can solve problems such as defects in the convex part 91, a decrease in the output of ferrite cores, and an increase in the protrusion length.

Inactive Publication Date: 2005-10-12
MATSUSHITA TOSHIBA PICTURE DIS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the tip of the convex portion 91 approaches the outer circumferential surface of the cone, the protruding length of the convex portion 91 becomes large, and the convex portion 91 becomes chipped, thereby causing a decrease in yield during the manufacture of the ferrite core.

Method used

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  • Ferrite core, deflection yoke, and color picture tube apparatus
  • Ferrite core, deflection yoke, and color picture tube apparatus
  • Ferrite core, deflection yoke, and color picture tube apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Fig. 2 is a perspective view of a ferrite core 40 used in a deflection yoke according to Embodiment 1 of the present invention. The ferrite core 40 is manufactured by sintering ferrite as a magnetic material as a whole into a substantially pyramidal shape. Here, the "substantially pyramidal shape" refers to a structure in which, when viewed macroscopically, the outer diameter and the inner diameter increase (or decrease) from one end to the other end in the central axis direction. Minute protrusions and depressions may exist on the outer peripheral surface, the inner peripheral surface, and the end face in the direction of the central axis. The ferrite core 40 is installed on the color picture tube, so that the central axis of the ferrite core 40 matches the Z axis of the color picture tube. Thus, the central axis of the ferrite core 40 will be referred to as the Z axis. Fig. 2 also shows the XYZ axes of the color picture tube on which the ferrite core 40 is to be mou...

Embodiment 2

[0065] Figure 10 is a perspective view of the ferrite core 40 used in the deflection yoke according to Embodiment 2 of the present invention. Figure 11 is a partial cross-sectional view of the ferrite core 40 on the YZ plane according to Embodiment 2. Such as Figure 10 and 11 As shown, the ferrite core 40 of Embodiment 2 is different from the ferrite core 40 of Embodiment 1 in that the protrusion 41 formed on the inner peripheral surface extends to the end on the large diameter side. The description of the same part as that of Embodiment 1 is omitted here, and this embodiment will be mainly described for points different from Embodiment 1.

[0066] Figure 12 is a cross-sectional view of the ferrite core 40 on the XY plane at a position near the end on the large-diameter side (Z=43 mm). as from Figure 6 It is obvious from the comparison with Figure 12 XY cross-section of the ferrite core 40 of Example 1 at the same position, several protrusions are also formed in t...

Embodiment 3

[0070] Figure 13 is an XY cross-sectional view at a position near the end (Z=3 mm) on the small-diameter side of the ferrite core 40 according to Embodiment 3 of the present invention. Figure 14 is an XY cross-sectional view at the approximate center position (Z=25 mm) of the ferrite core 40 according to Embodiment 3 of the present invention. Figure 15 is an XY cross-sectional view at a position near the end (Z=43 mm) on the large-diameter side of the ferrite core 40 according to Embodiment 3 of the present invention.

[0071] The ferrite core 40 of the third embodiment is different from the ferrite core 40 of the first embodiment in that the closed curve obtained by sequentially connecting the tips of the plurality of convex parts 41 (the envelope of the tips of the several convex parts 41 line) is generally rectangular in XY cross-section. The size of the closed curve 44 in the Y-axis direction has a maximum value WV on the Y-axis. The closed curve 44 defined in the XY...

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PUM

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Abstract

A ferrite core (40) constituting a deflection yoke (4) has a plurality of ridge-shaped convex portions (41) on an inner circumferential surface. In a cross-section orthogonal to a center axis, the cross-sectional shape of an outer circumferential surface of the ferrite core (40) is substantially circular, and the cross-sectional shape of an inner circumferential surface of the ferrite core (40) excluding the convex portions (41) is substantially circular in the vicinity of an end on a large diameter side of the ferrite core (40) and is substantially rectangular in a portion between the vicinity of an end on a small diameter side and the vicinity of the end on the large diameter side. This can provide a low-cost color picture tube apparatus with a reduced deflection power and satisfactory productivity.

Description

technical field [0001] The present invention relates to a color picture tube arrangement for use in television sets, computer monitors or the like. Furthermore, the present invention relates to a deflection yoke and a ferrite core for use in a color picture tube device. Background technique [0002] In order to reduce the required deflection power and suppress the heat generated by the deflection yoke, Japanese Patent Document JP 61(1986)-56757U discloses a so-called slotted core in which a ferrite core constituting the deflection yoke is provided on the inner surface A plurality of protrusions protruding toward the tube axis of the picture tube. Fig. 17 shows a cross-sectional view of a deflection yoke having a slotted core taken along a surface perpendicular to the tube axis at a position close to the electron gun. As shown in FIG. 17, the tube axis of the picture tube on which the deflection yoke is mounted is the Z axis, the horizontal axis perpendicular to the Z axis ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J29/76
CPCH01J29/76H01J2229/7031
Inventor 田上悦司石井昭次
Owner MATSUSHITA TOSHIBA PICTURE DIS