JP2004063455A - Deflection yoke and cathode-ray tube device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain further power-saving in a deflection yoke having a slot core. <P>SOLUTION: In this deflection yoke having a slot-type ferrite core 24 wherein a plurality of core projecting parts ribbed along the tube axial direction of the cathode-ray tube, are formed at predetermined intervals in the circumferential direction, and having core grooves S1 respectively formed by the adjacent core projecting parts, on its inner face, bottom parts of the exclusive core grooves S1, S5, S6, S10, S11, S15, S16, S20 in which only a vertical deflection coil 26 or a horizontal deflection coil 30 is respectively mounted, are closer to an outer surface of a glass bulb of the cathode-ray tube, in comparison with bottom parts of shared core grooves S2 to S4, S7 to S9, S12 to S14, S17 to S19 in which both of the deflection coils 26, 30 are mounted. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cathode ray tube device used for a television, a computer display, and the like, and a deflection yoke used for the cathode ray tube device, and particularly to a structure of the deflection yoke.
[0002]
[Prior art]
FIG. 10 shows a cross section of a ferrite core generally called a slot core, taken along a plane perpendicular to the Z axis (tube axis). On the inner surface of the ferrite core 100 of the deflection yoke, a plurality of ridge-shaped protrusions 102 protruding substantially toward the Z-axis (center 0) are provided in the circumferential direction along the Z-axis, and grooves 104 formed by adjacent protrusions 102 are provided. The vertical deflection coil 106 and the horizontal deflection coil 108 are wound via an insulating spacer 110. In addition, the cross section of each deflection coil is simplified and shown by hatching. This technique is disclosed in Patent Document 1. The envelope at the bottom of the groove 104 has a circular shape, and the envelope at the tip of the convex portion 102 also has a circular shape, both of which form a concentric circle centered on the Z axis.
[0003]
The deflection yoke having such a configuration has the following advantages over a normal deflection yoke formed of a ferrite core having a smooth inner surface without irregularities. Since the ferrite core can be made closer to the cathode ray tube, that is, the electron beam passage area, the deflection sensitivity is improved. Further, since the magnetic flux is less likely to be linked to the deflection coil, eddy current loss is reduced, and heat generation of the deflection yoke is suppressed. As a result, power saving in the deflection yoke is achieved.
[0004]
[Patent Document 1]
JP-A-61-56757 [0005]
[Problems to be solved by the invention]
In recent years, energy conservation measures have been taken in various fields due to the problem of environmental destruction. The field of the cathode ray tube device is not an exception, and the slot core type deflection yoke characterized by low power consumption as described above is required to further reduce power consumption.
[0006]
The present invention has been made in view of the above circumstances, and has as its object to provide a deflection yoke having a slot core and a cathode ray tube device including the deflection yoke, which are further reduced in power consumption.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a deflection yoke according to the present invention is a deflection yoke provided on an outer periphery of a glass bulb of a cathode ray tube, wherein a ridge-shaped convex portion along the tube axis direction of the cathode ray tube is formed on an inner surface in a circumferential direction. A magnetic core having a cylindrical shape formed by forming a plurality of grooves at predetermined intervals and forming a groove with the adjacent convex portion, and a vertical core wound in a form in which a part is disposed in the groove. A deflecting coil, and a horizontal deflecting coil wound partly in the groove, and the groove is occupied by only one of the horizontal deflecting coil and the vertical deflecting coil. Occupied groove, there is a shared groove shared by both deflection coils, the bottom of the occupied groove is closer to the outer surface of the glass bulb than the bottom of the shared groove in at least a part of the tube axis direction. It is characterized by being.
[0008]
Further, the deflection yoke is mounted so as to cover an area in which a cross section of the glass bulb cut in a plane perpendicular to the tube axis of the cathode ray tube smoothly transitions from a circle to a substantially rectangle, The core is characterized in that a cross section cut along the plane is formed in a shape that substantially matches the outer shape of the glass bulb over the entire length in the tube axis direction.
[0009]
Further, the magnetic core is characterized in that a cross section cut along a plane perpendicular to the tube axis of the cathode ray tube is substantially circular over the entire length in the tube axis direction.
Also, the bottom of the occupied groove is closer to the tube axis than the bottom of the shared groove.
In order to achieve the above object, a cathode ray tube device according to the present invention includes a cathode ray tube and the above-described deflection yoke arranged on the outer periphery of a glass bulb of the cathode ray tube.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic side view of a color cathode ray tube device 10 according to an embodiment. The color cathode ray tube device 10 includes a glass bulb 16 in which a front flat panel 12 having a phosphor screen formed on an inner surface thereof and a funnel 14 are joined, an electron gun 18 installed in a neck portion of the funnel 14, and a funnel 14. It has a deflection yoke 20 and a convergence yoke 22 arranged on the outer periphery. The funnel 14 is literally funnel-shaped. The outer cross section of the funnel 14 has a substantially pyramidal shape that smoothly transitions from the circular neck portion to the substantially rectangular front flat panel 12. FIG. 1 shows only the positional relationship among the above members, and the members including the deflection yoke 20 are shown in a very simplified manner.
[0011]
FIG. 2 is a front view of the deflection yoke 20 as viewed from the phosphor screen side. FIG. 3 is a front view of the core 24, and FIG. 4 is a perspective view of the core 24.
In this specification, X indicates a horizontal axis, and Y indicates a vertical axis. At the origin (point 0) where the two axes intersect, the axis that intersects the two axes at right angles is the Z axis (tube axis).
[0012]
The deflection yoke 20 is made of a magnetic material, and has a sectional shape adapted to the outer shape of the funnel 14, as shown in FIGS. That is, one end has a substantially circular cross section adapted to the neck, and the other end has a substantially rectangular cross section, such that the transition from the one end to the other end is smooth. It has a cross-sectional shape. In this embodiment, ferrite is used as the magnetic material. Hereinafter, the core 24 is referred to as a ferrite core 24.
[0013]
The deflection yoke 20 has a structure in which a vertical deflection coil 26, an insulating frame 28, and a horizontal deflection coil 30 are arranged in this order inside a core 24.
As shown in FIG. 3, on the inner surface of the ferrite core 24, a ridge-shaped protrusion (hereinafter, referred to as “core protrusion”) R protruding toward the Z-axis along the Z-axis (tube axis) direction. , Are formed at equal intervals in the circumferential direction. In the present example, twenty are formed at intervals of 18 °. As shown in FIGS. 3 and 4, the core convex portion R is formed halfway from the small-diameter end (electron gun-side end) to the large-diameter end (phosphor screen-side end). As shown in FIG. 3, when the ferrite core 24 is viewed from the front (from the phosphor screen side), it can be seen that the core protrusions R are provided radially. Here, among the core convex portions R on the X axis, the core convex portion on the right side as viewed in FIG. 3 is denoted by R1, and a serial number is added counterclockwise from the R1 to obtain each core convex portion R1. To R20. The interval between the core protrusions is not limited to the above-described interval, and may not be equal.
[0014]
As a result of the formation of the core protrusions R as described above, a groove (hereinafter, referred to as a “core groove”) S is formed by the adjacent core protrusions R. Here, a core groove formed by the core convex portion R1 and the core convex portion R2 is defined as S1, and a serial number is added counterclockwise from S1 to distinguish each of the core grooves S1 to S20.
Part of the vertical deflection coil 26 and the horizontal deflection coil 30 are guided by the core groove S and wound around the ferrite core 24.
[0015]
Of the core grooves S1 to S20, only the vertical deflection coil 26 is wound around the core grooves S5, S6, S15, and S16 near the Y axis, and the core grooves S1, S10, and S11 near the X axis, as described later. , S20, only the horizontal deflection coil 30 is wound. The other deflection coils 26 and 30 are wound around the other core grooves S2 to S4, S7 to S9, S12 to S14, and S17 to S19. That is, the core grooves S5, S6, S15, and S16 and the core grooves S1, S10, S11, and S20 are core grooves occupied by only one of the deflection coils (hereinafter, referred to as “occupied core grooves”). The core grooves S2 to S4, S7 to S9, S12 to S14, and S17 to S19 are core grooves shared by both deflection coils 26 and 30 (hereinafter, referred to as “shared core grooves”).
[0016]
Further, as shown in FIG. 3, the occupied core groove is formed shallower than the shared core groove. In other words, the bottom of the occupied core groove is formed closer to the outer surface of the funnel 14 (cathode ray tube) than the bottom of the shared core groove. The reason and the like formed in this manner will be described later.
Further, a protrusion P is provided at a position corresponding to an extension of each of the core protrusions R1 to R20 on the outer periphery near the large-diameter end of the ferrite core 24. The protrusion P is formed by bonding a pin made of a synthetic resin to the outer periphery of the ferrite core 24. In FIG. 4, illustration of the protrusion P is omitted.
[0017]
A saddle type vertical deflection coil 26 is directly wound around the ferrite core 24 having the above configuration.
FIG. 5 shows the state in which the sheet is wound.
The vertical deflection coil 26 is wound so as to be disposed in each of the core grooves S2 to S9 and S12 to S19 except for the core grooves S1, S10, S11, and S20. Accordingly, the vertical deflection coil 26 is wound at a winding angle defined by each of the core grooves S2 to S9 and S12 to S19 in a region near the electron gun where the core groove is formed.
[0018]
The vertical deflection coil 26 is wound around the projections P on the outer periphery near the large-diameter end of the ferrite core 24. That is, a desired winding distribution is realized by being wound at a winding angle defined by the protrusion P. In addition, the installation position of the protrusion P is not limited to the above-described one, and may be installed at an arbitrary position regardless of the position of the core protrusion. As a result, a winding distribution that is not so much restricted by the position of the core groove is realized in a region near the phosphor screen without the core groove.
[0019]
FIG. 6 is a front view of the insulating frame 28, and FIG. 7 is a partially cutaway plan view of the insulating frame 28.
The insulating frame 28 has a main body 29 made of synthetic resin having a cone shape along the outer shape of the funnel 14. The main body 29 electrically insulates the vertical deflection coil 26 from the horizontal deflection coil 30.
[0020]
The main body 29 includes an insulating frame cone portion 32 extending toward the phosphor screen and an insulating frame neck portion 34 extending toward the electron gun.
Projections (hereinafter, referred to as “guide projections”) Q projecting toward the Z-axis along the Z-axis (tube axis) direction are provided on the inner surface of the insulating frame cone portion 32 at predetermined intervals in the circumferential direction. I have. The projection Q is formed by bonding a bent synthetic resin bar material to the inner surface of the main body 29. As shown in FIGS. 6 and 7, the protrusion Q is provided near the large-diameter end of the main body 29 (the end of the phosphor screen). As shown in FIG. 6, when the insulating frame 28 is viewed from the front (from the phosphor screen side), it can be seen that the projections Q are provided radially. The end of each guide projection Q on the phosphor screen side is separated from the inner surface of the main body 29 (insulating frame cone portion 32), and a gap is formed between the guide protrusion Q and the inner surface. As described later, the horizontal deflection coil 30 is hooked and wound around a portion of the guide projection Q corresponding to the gap.
[0021]
Further, as a result of the formation of the guide protrusions Q as described above, a groove (hereinafter, referred to as a “guide groove”) G is formed by the adjacent guide protrusions Q.
In the insulating frame neck portion 34, a plurality of slits L having a predetermined width and a predetermined length are formed along the Z axis (tube axis) direction. The predetermined width is set according to the width of the core protrusion R of the ferrite core 24, and the predetermined length is set according to the length of the core protrusion R. As a result of the slits being formed in this manner, a plurality of belt-like members T extending from the insulating frame cone 32 are formed. As a result of the formation of the band-shaped member T as described above, the insulating frame neck 34 looks like a comb tooth as shown in FIG.
[0022]
The insulating frame 28 having the above configuration is mounted on the ferrite core 24 (FIG. 5) around which the vertical deflection coil 26 is wound. The ferrite core 24 is inserted from the large diameter side of the ferrite core 24 with the end of the insulating frame 28 on the insulating frame neck 34 side as the head. At this time, the insulating frame 28 and the ferrite core 24 are positioned so that the corresponding slits L fit into the core protrusions R1 and R2, in other words, the corresponding band-shaped members T enter the core grooves S1 and S20. Is relatively slid in the Z-axis (tube axis) direction for mounting.
[0023]
After the mounting, a saddle-type horizontal deflection coil 30 is wound around the insulating frame 28 as shown in FIG.
The guide projection Q may be provided only in a region where the horizontal deflection coil 30 is wound, and need not be provided in a region where the horizontal deflection coil 30 is not wound. 2 and 6 show examples in which the guide projection Q is not provided near the Y axis. Instead of providing the guide projection Q, a guide groove may be dug in the main body 29 of the insulating frame 28.
[0024]
FIG. 8 is a diagram in which the deflection yoke 20 is cut along a plane perpendicular to the Z axis (tube axis) in a state after the horizontal deflection coil 30 is wound. The cutting position in the Z-axis direction is a position where the core groove of the ferrite core 24 exists, that is, a position near the phosphor screen. In FIG. 8, the cross section of each deflection coil is indicated by hatching for simplification. As shown in FIG. 8, the vertical deflection coil 26 and the horizontal deflection coil 30 are wound around the core grooves S1 to S20. Further, the two deflection coils are reliably insulated by the belt-shaped member T.
[0025]
As described above, the occupied core grooves S5, S6, S15, S16, S1, S10, S11, and S20 are shallower than the shared core grooves S2 to S4, S7 to S9, S12 to S14, and S17 to S19. Is formed. In other words, the bottom of the occupied core grooves S5, S6, S15, S16, S1, S10, S11, S20 is more funnel than the bottom of the shared core grooves S2 to S4, S7 to S9, S12 to S14, S17 to S19. 14 (cathode ray tube).
[0026]
In the conventional deflection yoke, as shown in FIG. 10, all the core grooves are formed at the same depth regardless of whether they are occupied core grooves or shared core grooves. The deflection coil is wound around the bottom of the core groove so as to be pulled. Therefore, in the occupied core groove having a small winding dose, a useless space is generated between the deflection coil and the outer periphery of the cathode ray tube (glass bulb) in this portion.
[0027]
Therefore, in the present embodiment, the occupied core groove is made shallower than the shared core groove to eliminate the useless space, and the deflection coil is also mounted on the cathode ray tube (glass bulb) as much as possible in the occupied core groove. I tried to get closer. Thereby, the deflection sensitivity is further improved, and the power consumption can be reduced.
Note that the bottom of the occupied core groove does not necessarily have to be closer to the outer surface of the glass bulb than the bottom of the shared core groove over its entire length. In the tube axis direction, if there is at least one place where the bottom of the occupied core groove is closer to the outer surface of the glass bulb than the bottom of the shared core groove, that is, even if it is partially present, the power consumption reduction effect is obtained. can get.
[0028]
Further, in the above embodiment, the band-shaped members T are provided in the insulating frame 28 so as to correspond to all the core grooves. However, since there is no need to insulate the two deflection coils in the occupied core groove, the belt-shaped member may be eliminated from the occupied core groove. In the case of elimination, the occupied core groove is made shallower by the thickness of the band-shaped member. Thereby, the deflection sensitivity is further improved, and power saving can be achieved.
[0029]
Further, in the above embodiment, the ferrite core was formed according to the outer shape of the glass bulb. That is, since the deflection yoke is mounted so as to cover a region where the glass bulb is cut in a plane perpendicular to the tube axis of the cathode ray tube, and the outer shape smoothly transitions from a circle to a substantially rectangular shape, the deflection yoke has a cylindrical shape. The cross section of the ferrite core 24 cut in the plane is formed to have a shape substantially conforming to the outer shape of the glass bulb over the entire length in the tube axis direction. However, the shape of the ferrite core is not limited thereto, and the ferrite core may be formed so that the cross section cut along the plane is substantially circular over the entire length in the tube axis direction.
[0030]
FIG. 9 is a cross-sectional view of the deflection yoke 52 having the ferrite core 50 formed as described above, taken along a plane perpendicular to the tube axis. The cutting position in the pipe axis direction is the same as in the case of FIG.
The ferrite core 50 is also a slot core, and a ridge-shaped protrusion 54 projecting toward the Z axis (tube axis) is provided on the inner surface thereof at a specific angle. In the present embodiment, a total of 20 pieces are arranged at 18 ° intervals. The horizontal deflection coil 56 and the vertical deflection coil 58 are wound at a winding angle defined by the groove 60 and the groove 62 between the projections 54, and realize a desired winding distribution.
[0031]
In FIG. 9, the core groove in the region I is a shared core groove, and the core groove in the region II is an occupied core groove. In the common core groove, the horizontal deflection coil 56 and the vertical deflection coil 58 are insulated by a band-shaped member 64 (insulating frame). The example shown in FIG. 9 is an example in which the above-described occupied core groove is not provided with a band-shaped member.
[0032]
The groove 62 in the region II near the X axis and the Y axis is shallower than the groove 60 in the region I, and the bottom is close to the Z axis (tube axis). The groove 62 in the vicinity of the X axis around which only the horizontal deflection coil 56 is wound has a distance between the bottom and the tip of the projection 54, that is, a depth of 2 mm. The groove 62 in the vicinity of the Y axis where only the vertical deflection coil 58 is wound has a depth of 3 mm.
[0033]
On the other hand, the groove 60 in the region II where both the horizontal deflection coil 56 and the vertical deflection coil 58 are wound has a depth of 5 mm.
As an example of the effect of reducing the deflection power according to the present invention, the horizontal deflection power is reduced by about 3 to 5% and the vertical deflection power is reduced by 2 to 4%.
[0034]
【The invention's effect】
As described above, according to the deflection yoke according to the present invention, since the bottom of the occupied groove is closer to the outer surface of the glass bulb than the bottom of the shared groove, the deflection coil disposed in the occupied groove has: It will be closer to the outer surface of the glass bulb than the conventional one, thereby reducing power consumption.
[0035]
Further, according to the cathode ray tube device of the present invention, since the deflection yoke is arranged on the outer periphery of the glass bulb of the cathode ray tube, the same effects as described above can be obtained.
[Brief description of the drawings]
FIG. 1 is a side view showing a schematic configuration of a cathode ray tube device.
FIG. 2 is a front view showing a schematic configuration of a deflection yoke.
FIG. 3 is a front view of a ferrite core.
FIG. 4 is a perspective view of a ferrite core.
FIG. 5 is a front view of a ferrite core on which a vertical deflection coil is wound.
FIG. 6 is a front view of the insulating frame.
FIG. 7 is a plan view of the insulating frame.
FIG. 8 is a sectional view of the deflection yoke cut along a plane perpendicular to the tube axis.
FIG. 9 is a cross-sectional view of a deflection yoke according to a modification cut along a plane perpendicular to a tube axis.
FIG. 10 is a sectional view of a conventional deflection yoke cut along a plane perpendicular to a tube axis.
[Explanation of symbols]
Reference Signs List 10 color cathode ray tube device 16 glass bulb 20, 52 deflection yoke 24, 50 ferrite core 26, 58 vertical deflection coil 30, 56 horizontal deflection coil 54 convex part 60 groove R1 to R20 core convex part S1 to S20 core groove

Claims (5)

A deflection yoke provided around the glass bulb of the cathode ray tube,
A plurality of ridge-shaped protrusions are formed on the inner surface at predetermined intervals in the circumferential direction along the tube axis direction of the cathode ray tube, and grooves are formed in the adjacent protrusions, and a cylindrical magnetic core. ,
A vertical deflection coil wound in such a manner that a part thereof is disposed in the groove,
A horizontal deflection coil wound in a form in which a part is disposed in the groove,
The groove has an occupied groove occupied by only one of the horizontal deflection coil and the vertical deflection coil, and a common groove shared by both deflection coils, and the occupied groove is at least partially occupied in the tube axis direction. A deflection yoke, wherein a bottom of the groove is closer to an outer surface of the glass bulb than a bottom of the common groove. A deflection yoke that is mounted so as to cover an area where a cross section of the glass bulb cut along a plane perpendicular to the tube axis of the cathode ray tube smoothly transitions from a circular shape to a substantially rectangular shape,
2. The deflection yoke according to claim 1, wherein the cross section of the magnetic core cut in the plane is formed in a shape substantially conforming to the outer shape of the glass bulb over the entire length in the tube axis direction. 2. The deflection yoke according to claim 1, wherein the magnetic core has a substantially circular cross section taken along a plane perpendicular to the tube axis of the cathode ray tube over the entire length in the tube axis direction. 4. The deflection yoke according to claim 3, wherein a bottom of the occupied groove is closer to the tube axis than a bottom of the shared groove. A cathode ray tube,
A cathode ray tube device comprising: the deflection yoke according to any one of claims 1 to 4, which is arranged around the glass bulb of the cathode ray tube.

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