JP2005322627A - Ferrite core, deflection yoke, and color picture tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a color picture tube, having proper deflection sensitivity capable of reducing deflection electric power and proper productivity, and low cost. <P>SOLUTION: A ferrite core 40, as a constituent of a deflection yoke 4, has a plurality of ridge-shaped convex parts 41 on its inner peripheral face. On a cross section diagonal to a central axis, the cross-sectional shape of the outer peripheral face of the ferrite core 40 is almost circular, and that of the inner peripheral face between the neighboring part of an end part having a short diameter and that having a large diameter, excluding the convex part, is almost rectangular. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a color picture tube apparatus used for a television or a computer display. The present invention also relates to a deflection yoke and a ferrite core used in the color picture tube apparatus.

  In order to reduce the deflection power and suppress the heat generation of the deflection yoke, there is a so-called slot core in which a plurality of convex portions projecting in the tube axis direction of the picture tube are provided on the inner surface of the ferrite core constituting the deflection yoke. 1 is disclosed. FIG. 17 shows a sectional view of the deflection yoke having the slot core on a plane perpendicular to the tube axis at a position near 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 orthogonal to the Z axis is the X axis, and the vertical axis orthogonal to the Z axis and the X axis is the Y axis. . In FIG. 17, 90 is a ferrite core, and 91 is a plurality of convex portions provided on the inner surface thereof. A horizontal deflection coil 97 and a vertical deflection coil 98 are wound around a groove between convex portions 91 adjacent to each other in the circumferential direction. Reference numeral 99 denotes an insulating frame for insulating the horizontal deflection coil 97 and the vertical deflection coil 98. Each convex portion 91 extends along the plane including the tube axis over the entire region in the tube axis direction of the ferrite core 90 from the electron gun side end to the screen side end. By providing such a convex portion 91, the ferrite core 90 can be brought closer to the picture tube than in the case where the convex portion 91 is not provided, so that the deflection efficiency can be improved, which is advantageous in reducing the deflection power. In addition, since the magnetic flux is hardly interlinked with the coils 97 and 98, eddy current loss is reduced, and heat generation of the deflection yoke can be reduced.

  The deflection yoke is mounted on the outer peripheral surface of the funnel of the color picture tube. Conventionally, the cross-sectional shape on the surface perpendicular to the tube axis of the outer peripheral surface of the funnel at the portion where the deflection yoke is mounted has been generally circular. However, in order to match the rectangular display screen on which the phosphor screen is formed, except for the neck portion in which the electron gun is built, the cross-sectional shape of the diameter changing portion is directed from the neck portion side toward the phosphor screen side. A funnel that is gradually changed from a circular shape to a substantially rectangular shape is used. In order to match this, as shown in FIG. 18, a deflection yoke is proposed in which the ferrite core 90, the horizontal deflection coil 97, the vertical deflection coil 98, and the insulating frame 99 have substantially rectangular cross-sectional shapes. (For example, refer to Patent Document 2). In this deflection yoke, the envelope 94 connecting the tips of the convex portions 91 formed on the inner peripheral surface of the ferrite core 90 is also substantially rectangular. In this way, by making the cross-sectional shape of each constituent member constituting the deflection yoke in accordance with the cross-sectional shape of the outer peripheral surface of the substantially rectangular funnel, the deflection yoke, in particular, the convex portion 91 of the ferrite core 90 is made to be an electron beam. Therefore, the deflection sensitivity can be further improved, and the deflection power can be further reduced.

  Further, a deflection yoke as shown in FIG. This deflection yoke has an inner peripheral surface (smooth virtual curved surface obtained by connecting the bottom surfaces of the grooves between the convex portions 91 in order) excluding the convex portions 91 of the ferrite core 90 and a cross-sectional shape on the XY plane of the outer peripheral surface. They differ from the deflection yoke shown in FIG. 18 in that both are circular. An envelope 94 connecting the tips of the convex portions 91 is a substantially rectangular shape that matches the cross-sectional shape of the outer peripheral surface of the funnel to be mounted. Accordingly, the deflection yoke of FIG. 19 can improve the deflection sensitivity and reduce the deflection power, similarly to the deflection yoke of FIG.

  Further, since the ferrite core 90 used in the deflection yoke of FIG. 19 has a circular cross section on the XY plane except for the envelope 94 connecting the tips of the convex portions 91, it is used for the deflection yoke of FIG. Compared to ferrite cores, it is easier to design and has better dimensional stability.

Further, in the ferrite core firing step, the ferrite core of FIG. 19 has an advantage over the ferrite core of FIG. The reason is as follows. When the ferrite core is fired, the uncured ferrite core needs to be held by a mortar-shaped fixing jig having an opening that can contact the outer peripheral surface of the ferrite core over the entire circumference. For the ferrite core of FIG. 18, a dedicated fixing jig that matches the outer peripheral surface of the substantially rectangular cross section is required. On the other hand, a general-purpose common fixing jig having a substantially conical surface can be used for the ferrite core of FIG. 19 regardless of the outer diameter of the ferrite core. Further, since a common fixing jig can be used, the heat capacity of the fixing jig is the same, and it is easy to set the firing conditions even when firing plural types of ferrite cores simultaneously. Thus, if it is the ferrite core of FIG. 19, a baking process can be performed efficiently at low cost. Further, the number of fixing jigs that can be accommodated in the firing furnace can be kept constant in an efficient state.
Japanese Utility Model Publication No. 61-56757 International Publication No. WO99 / 26270 Pamphlet JP 2004-14349 A

  However, the ferrite core of FIG. 19 has an envelope connecting the tips of the convex portions 91, whereas the cross-sectional shapes of the inner peripheral surface and the outer peripheral surface excluding the convex portions 91 are circular regardless of the position in the tube axis direction. Since the line 94 is substantially rectangular, when trying to make the tip of the convex portion 91 approach the outer peripheral surface of the funnel, the projecting length of the convex portion 91 becomes long and the convex portion 91 is missing. There is a problem that the yield of the is reduced.

  The present invention solves the above-described conventional problems, has a ferrite core with a ridge-shaped convex portion on the inner peripheral surface, has good deflection sensitivity, can reduce deflection power, has good productivity, and is low in cost. An object of the present invention is to provide a color picture tube apparatus. It is another object of the present invention to provide a deflection yoke and a ferrite core for realizing such a color picture tube device.

  The ferrite core of the present invention is a ferrite core having a substantially funnel shape, and has a plurality of convex portions arranged in the circumferential direction on the inner peripheral surface. Each of the convex portions has a bowl shape along the direction connecting the small-diameter side end and the large-diameter side end of the ferrite core. In the cross section perpendicular to the central axis of the ferrite core, the cross-sectional shape of the outer peripheral surface of the ferrite core is substantially circular. In the cross section orthogonal to the central axis, the cross-sectional shape of the inner peripheral surface of the ferrite core excluding the plurality of convex portions is substantially circular in the vicinity of the large diameter side end, and in the vicinity of the small diameter side end and the large diameter It is a substantially rectangular shape in the part between the side end vicinity. Here, “the vicinity of the large (small) diameter side end” is intended to exclude the area where the chamfering or the like is formed at the large (small) diameter side end. .

  The deflection yoke of the present invention includes the ferrite core of the present invention, a vertical deflection coil that generates a vertical deflection magnetic field substantially along a first axis orthogonal to the central axis, and the central axis and the first axis. A horizontal deflection coil that generates a horizontal deflection magnetic field substantially along the second axis; and an insulating frame that insulates the vertical deflection coil from the horizontal deflection coil.

  Further, the color picture tube device of the present invention is mounted on the outer surface of the funnel, an envelope composed of a front panel and a funnel, an electron gun that is housed in the neck portion of the funnel and emits an electron beam, A deflection yoke for deflecting the electron beam in a horizontal direction and a vertical direction. The deflection yoke is the deflection yoke of the present invention described above.

  The ferrite core of the present invention is a slot core having a plurality of ridge-shaped projections on the inner peripheral surface, but has good productivity and low cost. In addition, the slot core has the original effects of improving the deflection efficiency and reducing the deflection power.

  Further, the deflection yoke and the color picture tube device of the present invention can realize low power consumption, low heat generation, low cost, and light weight.

  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 color picture tube apparatus according to the present invention.

  As shown in FIG. 1, the color picture tube of this color picture 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. As shown in the figure, an XYZ orthogonal coordinate system in which the tube axis of such a color picture tube is the Z axis, the horizontal axis orthogonal to the Z axis is the X axis, and the X axis and the vertical axis orthogonal to the Z axis is the Y axis. 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.

  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 on the outer peripheral surface of the neck portion 3. 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 color picture tube apparatus of the present invention will be described in more detail.

(Embodiment 1)
FIG. 2 is a perspective view of the ferrite core 40 used in the deflection yoke according to Embodiment 1 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 color picture tube with its central axis coinciding with the Z-axis of the color picture 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 color picture tube on which the ferrite core 40 is mounted.

  FIG. 3 is a cross-sectional view of the ferrite core 40 according to the first embodiment on a plane (YZ plane) including the Z axis and the vertical axis (Y axis). Since the sectional shape of the ferrite core 40 on the YZ plane is symmetric with respect to the Z axis, only the sectional shape on one side with respect to the Z axis is shown. As shown in the figure, the position of the small-diameter side end of the ferrite core 40 is set to Z = 0, and the larger-diameter side is set to the positive direction of the Z axis. The Z-axis direction dimension (length) of the ferrite core 40 of the first embodiment is 48 mm.

  4 is a cross-sectional view taken along a plane (XY plane) perpendicular to the Z-axis at a position near the small-diameter end of the ferrite core 40 (Z = 3 mm), and FIG. 25 is a cross-sectional view on the XY plane, and FIG. 6 is a cross-sectional view on the XY plane at a position in the vicinity of the large-diameter side end of the ferrite core 40 (Z = 43 mm).

  As shown in FIGS. 2-6, the ferrite core 40 is provided with the some convex part 41 arranged in the circumferential direction on the internal peripheral surface. Each convex portion 41 protrudes substantially toward the Z axis, and is formed in a bowl shape substantially along a plane including the Z axis. In the Z-axis direction, the convex portion 41 is formed in the range of the position of Z = 36 mm from the small diameter side end (Z = 0 mm), and is formed in the range of Z = 38 to 48 mm in the vicinity of the large diameter side end. Absent.

  4 to 6, the cross-sectional shape of the inner peripheral surface 43 of the ferrite core 40 excluding the plurality of convex portions 41 is the vicinity of the small-diameter side end of the ferrite core shown in FIG. 4 and FIG. 6. It is substantially circular in the vicinity of the large-diameter side end, and is substantially rectangular as shown in FIG. The “inner peripheral surface 43 of the ferrite core 40 excluding the plurality of convex portions 41” is a groove between the convex portions 41 in the cross section where the convex portions 41 are formed as shown in FIGS. 4 and 5. This means a smooth virtual curved surface obtained by connecting the bottom surfaces of 42 in order, and the inner peripheral surface itself of the ferrite core 40 in the cross section where the convex portions 41 are not formed as shown in FIG. In the first embodiment, the cross-sectional shape of the inner peripheral surface 43 in the XY cross section is substantially circular (see FIG. 4) in the range of Z = 0 to 5 mm (region I) on the small diameter side in FIG. In the range of 5 to 36 mm (region II), it is substantially rectangular (see FIG. 5), and in the range of Z = 38 to 48 mm on the large diameter side (region IV), it is substantially circular (see FIG. 6). In the range of Z = 36 to 38 mm (region III), the cross-sectional shape of the inner peripheral surface 43 gradually changes from a substantially rectangular shape to a substantially circular shape. Note that the cross-sectional shape of the inner peripheral surface 43 is “substantially rectangular”, as shown in FIG. 5, the cross-sectional shape has radii RL, RS, This includes the case where the shape is a combination of three arcs having RD.

  Further, as shown in FIGS. 4 and 5, on the X-axis (first axis) of the closed curve (envelope curve of the tips of the convex portions 41) 44 obtained by connecting the tips of the plurality of convex portions 41 in order in the XY cross section. WH> WV, where WH is the dimension on W and the dimension on the Y-axis (second axis) is WV. The closed curve 44 is not defined in the XY cross section (for example, FIG. 6) where the convex portion 41 does not exist. As shown in FIGS. 4 and 5, when attention is paid only to the portion above the X axis of the closed curve 44, this portion has a substantially M-shape. That is, the dimension of the closed curve 44 in the Y-axis direction is maximum at two points on the X-axis that are slightly separated from the Y-axis.

  Furthermore, in the XY cross section as shown in FIGS. 4 to 6, the cross-sectional shape of the outer peripheral surface of the ferrite core 40 is substantially circular regardless of the position on the Z axis.

  FIG. 7 is an XY cross-sectional view at the position of Z = 25 mm of the deflection yoke 4 according to the first embodiment having the ferrite core 40 described above. As shown in the figure, the vertical deflection coil 48 is wound in a toroidal shape so that its winding is fitted in a groove between adjacent convex portions 41 of the ferrite core 40. A horizontal deflection coil 47 is disposed with its winding wound in a saddle shape at a position closer to the Z-axis than the vertical deflection coil 48. An insulating frame 49 disposed between the vertical deflection coil 48 and the horizontal deflection coil 47 insulates both coils and holds both coils. The horizontal deflection coil 47 emits a horizontal deflection magnetic field substantially along the Y axis (second axis), and the vertical deflection coil 48 emits a vertical deflection magnetic field substantially along the X axis (first axis).

  The deflection yoke 4 configured as described above is mounted on the outer peripheral surface of the funnel 2 of the color picture tube as shown in FIG. 1 to constitute a color picture tube device.

  Next, the effect of the first embodiment will be described.

  As described above, in the conventional ferrite core 90 shown in FIG. 19, when the tip of the convex portion 91 is made to approach the outer peripheral surface of the funnel, the protruding length of the convex portion 91 becomes long and the convex portion 91 is missing. Had problems such as. In order to solve this problem, the present inventors evaluated a ferrite core 80 as shown in FIG. This ferrite core 80 differs from the ferrite core 90 of FIG. 19 in that the cross-sectional shape of the inner peripheral surface 83 excluding the plurality of convex portions 81 is substantially rectangular regardless of the position in the Z-axis direction. FIG. 9 is a sectional view of the ferrite core 80 on the YZ plane.

  Since the ferrite core 80 can reduce the protruding length of the convex portion 81, the problem of the chipping of the convex portion 91 that the ferrite core 90 of FIG. 19 has can be solved. However, in particular, the thickness T of the portion where the YZ planes near the large-diameter side end intersect is abnormally larger than the thickness of the other portions, and in the firing process of the ferrite core 80, the setting range of firing conditions is narrow. There is a problem that it is difficult to uniformly fire the whole. There is also a problem that the weight of the ferrite core 80 increases due to the thick portion of the thickness T. Furthermore, there is a problem that the cost increases due to an increase in weight.

  Therefore, the inventors further studied and devised the ferrite core 40 of the first embodiment described above.

  The ferrite core 40 is a slot core having a substantially circular XY cross-sectional shape on the outer peripheral surface and having a plurality of convex portions 41 on the inner peripheral surface, and the inner peripheral surface 43 of the ferrite core 40 excluding the plurality of convex portions 41. The cross-sectional shape is substantially rectangular at a portion between the vicinity of the small-diameter side end and the vicinity of the large-diameter side end (see FIG. 5), and is generally circular near the large-diameter side end (see FIG. 6). Therefore, as in the first embodiment, the large diameter side of the ferrite core 40 is obtained while providing the convex portion 41 at the portion where the inner peripheral surface 43 has a substantially rectangular cross-sectional shape in the Z-axis direction and obtaining the effect of reducing the deflection power. A configuration in which the convex portion 41 is not provided in the region IV is possible. As a result, a thick portion like the ferrite core 80 of FIG. 8 does not exist at the large diameter side end of the ferrite core 40. Therefore, firing is easy in the firing step. Further, the weight of the ferrite core is not increased, and therefore the cost is not increased. Moreover, since the convex part 41 does not exist in the large diameter side end vicinity, the protrusion length of the convex part 41 does not become long, and the problem that the convex part 41 is missing does not occur.

  Further, the cross-sectional shape of the inner peripheral surface 43 changes from a substantially circular shape in the region I on the small-diameter side end to a substantially rectangular shape in the region II so as to match the XY cross-sectional shape of the outer peripheral surface of the mounted funnel. Therefore, in these regions, the tip of the convex portion 41 can be brought close to the outer peripheral surface of the funnel without making the protruding length of the convex portion 41 extremely long. Therefore, the convex portion 41 is not chipped in these regions.

  Since the ferrite core 40 is a slot core having a plurality of convex portions 41 on the inner peripheral surface, the ferrite core 40 can be brought close to the picture tube as in the conventional slot core. Therefore, the deflection efficiency can be improved and the deflection power can be reduced.

  Further, since the winding of the vertical deflection coil 48 is fitted in the groove 42 between the convex portions 41, the magnetic flux does not easily cross the vertical deflection coil 48. Therefore, eddy current loss is reduced and heat generation of the deflection yoke can be reduced.

  In the first embodiment, the convex portion 41 does not exist in the vicinity of the large diameter side end. However, in the Z-axis direction, the portion near the large-diameter side end is originally far from the electron beam than the other portions, so even if the convex portion 41 does not exist near the large-diameter side end, The effects inherent to the slot core can be sufficiently obtained.

  In addition, when the closed curve 44 obtained by sequentially connecting the tips of the plurality of convex portions 41 in the XY cross section at at least one point on the Z axis satisfies WH> WV, the tip of the convex portion 41 has an XY cross-sectional shape. The outer peripheral surface of the funnel having a substantially rectangular shape can be as close as possible. Therefore, the deflection sensitivity can be improved and the deflection power can be further reduced.

  Furthermore, the XY cross-sectional shape of the outer peripheral surface of the ferrite core 40 is substantially circular regardless of the position in the Z-axis direction. Therefore, a general-purpose common fixing jig can be used in the firing process. When firing a plurality of types of ferrite cores at the same time, since a common fixing jig having the same heat capacity can be used, it is easy to set firing conditions. Therefore, the firing process can be efficiently performed at a low cost. In addition, since it is substantially circular, the design of the outer peripheral surface is easy.

  Therefore, the deflection yoke 4 including the ferrite core 40 of the first embodiment can realize improved deflection sensitivity, reduced deflection power, reduced heat generation, improved productivity, reduced cost, and reduced weight.

  Further, the color picture tube device provided with such a deflection yoke 4 can realize low power consumption, low heat generation, low cost, and light weight.

  In the embodiment described above, the closed curve 44 defined in the XY section at all points within Z = 0 to 36 mm satisfies WH> WV, but the present invention is not limited to this. The ferrite core 40 preferably has at least one XY cross section in which the closed curve 44 satisfies WH> WV. In particular, it is preferable that the XY cross section in which the closed curve 44 satisfies WH> WV is within the range in the Z-axis direction in which the inner peripheral surface 43 is substantially rectangular. With this preferable configuration, since the protruding length of the convex portion 41 can be reduced, problems such as chipping of the convex portion 41 can be further reduced.

(Embodiment 2)
FIG. 10 is a perspective view of a ferrite core 40 used in the deflection yoke according to the second embodiment of the present invention. FIG. 11 is a half sectional view of the ferrite core 40 according to the second embodiment on the YZ plane. As shown in FIGS. 10 and 11, the ferrite core 40 of the second embodiment is implemented in that the convex portion 41 formed on the inner peripheral surface extends to the large-diameter side end. This is different from the ferrite core 40 of the first embodiment. Description of parts common to the first embodiment will be omitted, and the present embodiment will be described focusing on differences from the first embodiment.

  FIG. 12 is a cross-sectional view on the XY plane at a position (Z = 43 mm) in the vicinity of the large-diameter side end of the ferrite core 40. As is clear from comparison with FIG. 6 showing the XY cross-sectional view of the ferrite core 40 of the first embodiment at the same position, in the second embodiment, the large-diameter side region (Z = 38) of the ferrite core 40. (About 48 mm) is also formed with a convex portion 41. The XY cross-sectional view at the position (Z = 3 mm) near the small-diameter side end of the ferrite core 40 of the second embodiment and the XY cross-sectional view at the substantially central position (Z = 25 mm) are shown in FIGS. Same as 5. Further, the XY cross-sectional view at the position of Z = 25 mm of the deflection yoke 4 according to the second embodiment provided with the ferrite core 40 of the second embodiment is the same as FIG.

  The second embodiment also has the same effect as the first embodiment.

  As in the first embodiment, the closed curve 44 defined in the XY cross section at all points within Z = 0 to 36 mm satisfies WH> WV, so that the original effect of the slot core is sufficiently exhibited. Therefore, since the protrusion length of the convex part 41 in the vicinity of the large-diameter side end can be reduced, the chipping of the convex part 41 can be prevented. However, if the protruding length of the convex portion 41 near the large-diameter side end is made as large as possible, the deflection efficiency can be improved and the deflection power can be reduced.

(Embodiment 3)
FIG. 13 is an XY cross-sectional view at a position (Z = 3 mm) in the vicinity of the small diameter side end of the ferrite core 40 according to the third embodiment of the present invention, and FIG. 14 is a ferrite core 40 according to the third embodiment of the present invention. FIG. 15 is an XY cross-sectional view at a position (Z = 43 mm) in the vicinity of the large-diameter side end of the ferrite core 40 according to the third embodiment of the present invention. is there.

  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 portions 41 in the XY cross section (the envelope of the tips of the convex portions 41) ) 44 is a substantially rectangular point. The dimension of the closed curve 44 in the Y-axis direction has a maximum value WV on the Y-axis. It is the same as the ferrite core 40 of the first embodiment that the closed curve 44 defined in the XY cross section at all points within Z = 0 to 36 mm satisfies WH> WV.

  FIG. 16 is an XY cross-sectional view at the position of Z = 25 mm of the deflection yoke 4 according to the third embodiment provided with the ferrite core 40 of the third embodiment. The insulating frame 49 has a substantially rectangular XY cross-sectional shape along the substantially rectangular closed curve 44.

  The third embodiment is the same as the first embodiment except for the above, and has the same effect as the first embodiment.

  In the above-described first to third embodiments, the winding of the horizontal deflection coil 47 may be wound so as to be fitted into the groove 42 between the convex portions 41 as in FIGS. Thereby, since the magnetic flux linked to the horizontal deflection coil 47 is reduced, eddy current loss and heat generation can be further reduced.

  In the above first to third embodiments, all the plurality of convex portions 41 protrude substantially toward the Z axis, but the present invention is not limited to this. For example, in the XY cross section, the convex portion 41 may protrude substantially parallel to the X axis or the Y axis.

  In the present invention, the convex portion “having a hook shape along the direction connecting the small-diameter side end and the large-diameter side end of the ferrite core” indicates a general direction in which the hook-shaped convex portion 41 extends. . As shown in the first to third embodiments, the direction of the bowl-shaped convex portion 41 does not need to be substantially along the plane including the Z axis. For example, the circumferential position with respect to the Z-axis of the convex portion 41 in the XY cross section may change according to the Z-axis direction position. More specifically, for example, the convex portion 41 may extend spirally between the small-diameter side end and the large-diameter side end of the ferrite core 40.

  The convex portion need not be present in the entire region between the small-diameter side end and the large-diameter side end, and in the vicinity of the small-diameter side end, near the large-diameter side end, or in one or a plurality of sections between them. There may be an area where no part exists.

  In the first to third embodiments described above, the cross-sectional shape in the XY cross section of the inner peripheral surface 43 of the ferrite core 40 excluding the plurality of convex portions 41 in the vicinity of the small diameter side end is substantially circular. For example, a substantially rectangular shape may be used. However, in general, the XY cross-sectional shape of the outer peripheral surface of the funnel 2 at a position where the vicinity of the end on the small diameter side of the ferrite core 40 is substantially circular, the XY of the inner peripheral surface 43 in the vicinity of the end on the small diameter side of the ferrite core 40 is. A substantially circular cross-sectional shape is preferable because the ferrite core 40 can be brought close to the electron beam.

  In the first to third embodiments, the closed curve 44 obtained by connecting the tips of the plurality of convex portions 41 in order in the XY cross section at at least one point on the Z axis satisfies WH> WV. The invention is not limited to this. For example, although the effect of reducing the deflection power is inferior to that of the first to third embodiments, the closed curve 44 may be circular regardless of the position in the Z-axis direction.

  In the present invention, the fact that the cross-sectional shape of the inner / outer peripheral surface of the ferrite core 40 in the XY cross section is “substantially circular” means a shape that can be determined to be substantially circular, for example, distortion due to manufacturing errors. And the case where there are minute protrusions and depressions on the surface.

  The application field of the present invention is not particularly limited, and can be widely used for color picture tube devices such as a television or a computer display.

1 is a cross-sectional view of an example of a color picture tube device according to the present invention. The perspective view of the ferrite core used for the deflection | deviation yoke which concerns on Embodiment 1 of this invention 1 is a cross-sectional view of a plane including a central axis and a vertical axis of a ferrite core according to Embodiment 1 of the present invention. Sectional drawing in a surface perpendicular | vertical to the central axis in the position near the small diameter side end of the ferrite core which concerns on Embodiment 1, 2 of this invention Sectional drawing in the surface perpendicular | vertical to the central axis in the substantially central part of the central axis direction of the ferrite core which concerns on Embodiment 1, 2 of this invention Sectional drawing in a plane perpendicular to the central axis at a position near the large-diameter side end of the ferrite core according to Embodiment 1 of the present invention Sectional drawing in the surface perpendicular | vertical to the central axis in the substantially central part of the central axis direction of the deflection yoke which concerns on Embodiment 1, 2 of this invention. Perspective view of a ferrite core according to a comparative example Single sectional view of a plane including the central axis and the vertical axis of a ferrite core according to a comparative example The perspective view of the ferrite core used for the deflection | deviation yoke which concerns on Embodiment 2 of this invention. Single sectional view of a plane including a central axis and a vertical axis of a ferrite core according to Embodiment 2 of the present invention Sectional drawing in a plane perpendicular to the central axis at a position near the large-diameter side end of the ferrite core according to Embodiment 2 of the present invention Sectional drawing in a surface perpendicular | vertical to the central axis in the position of the small diameter side end vicinity of the ferrite core which concerns on Embodiment 3 of this invention Sectional drawing in the surface perpendicular | vertical to the central axis in the approximate center part of the central axis direction of the ferrite core which concerns on Embodiment 3 of this invention Sectional drawing in a surface perpendicular | vertical to the central axis in the position of the large diameter side end vicinity of the ferrite core which concerns on Embodiment 3 of this invention Sectional drawing in the surface perpendicular | vertical to the central axis in the approximate central part of the central axis direction of the deflection yoke which concerns on Embodiment 3 of this invention. Sectional drawing in a plane perpendicular to the tube axis of an example of a deflection yoke having a conventional slot core Sectional drawing in a plane perpendicular to the tube axis of another example of a deflection yoke having a conventional slot core Sectional drawing in a plane perpendicular to the tube axis of still another example of a deflection yoke having a conventional slot core

Explanation of symbols

1A Phosphor screen 1 Front panel 2 Funnel 3 Neck 4 Deflection yoke 5 CPU
6 Electron gun 7 Electron beam 40 Ferrite core 41 Protruding portion 42 Groove 43 Inner peripheral surface 44 of ferrite core Closed curve connecting the tips of the convex portions (envelope of the tips of the convex portions)
47 Horizontal deflection coil 48 Vertical deflection coil 49 Insulation frame

Claims (6)

A ferrite core having a substantially funnel shape,
It has a plurality of convex portions arranged in the circumferential direction on the inner peripheral surface,
All of the convex portions are bowl-shaped along the direction connecting the small diameter side end and the large diameter side end of the ferrite core,
In the cross section orthogonal to the central axis of the ferrite core, the cross-sectional shape of the outer peripheral surface of the ferrite core is substantially circular,
In the cross section orthogonal to the central axis, the cross-sectional shape of the inner peripheral surface of the ferrite core excluding the plurality of convex portions is substantially circular in the vicinity of the large diameter side end, and in the vicinity of the small diameter side end and the large diameter A ferrite core characterized by being substantially rectangular in a portion between the side end vicinity.   In a cross section orthogonal to the central axis at at least one point on the central axis, a dimension on the first axis orthogonal to the central axis of a closed curve obtained by sequentially connecting tips of the plurality of convex portions is WH, 2. The ferrite core according to claim 1, wherein WH> WV when a dimension on a central axis and a second axis orthogonal to the first axis is WV.   3. The ferrite core according to claim 2, wherein the cross section of the inner peripheral surface excluding the plurality of convex portions has the cross section where WH> WV within a range on the central axis having a cross section having a substantially rectangular shape.   2. The ferrite core according to claim 1, wherein a cross-sectional shape of an inner peripheral surface of the ferrite core excluding the plurality of convex portions is substantially circular in a cross section orthogonal to the central axis in the vicinity of the small-diameter side end. A ferrite core according to claim 1;
A vertical deflection coil for generating a vertical deflection magnetic field substantially along a first axis orthogonal to the central axis;
A horizontal deflection coil for generating a horizontal deflection magnetic field substantially along a second axis perpendicular to the central axis and the first axis;
A deflection yoke comprising: an insulating frame that insulates the vertical deflection coil and the horizontal deflection coil. An envelope consisting of a front panel and a funnel;
An electron gun stored in the funnel neck and emitting an electron beam;
A color picture tube apparatus, comprising: 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;
6. A color picture tube apparatus according to claim 5, wherein said deflection yoke is the deflection yoke according to claim 5.

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