JP2005108831A - Color picture tube device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a ring-like ferrite core from being broken in a color picture tube device of which the CPU is provided with a beam speed modulation coil and a ring-like ferrite core to strengthen a magnetic field of the coil. <P>SOLUTION: A CPU 10 to adjust color purity and a color shift at a screen center is disposed on the outer periphery face of a neck 3a. The beam speed modulation coil 20 to modulate a scanning speed in the horizontal direction of an electron beam is disposed at a position overlapped with the CPU 10 in a tube axial direction. The ring-like ferrite core 70 is disposed at a position overlapped with the coil 20 in the tube axial direction. Two surfaces of the ferrite core 70 perpendicular to the tube axis are covered with resin layers. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a color picture tube device.

  In order to improve the image quality by correcting the contour of the display image, a method of modulating the horizontal scanning speed of the electron beam is known. In this method, generally, a pair of auxiliary coils called beam velocity modulation (BVM) coils are provided integrally with a deflection yoke and a CPU (Convergence and Purity Unit) at the neck of the picture tube (for example, patents). Reference 1).

  This BVM coil improves the visible state between the dark part and the bright part of the image displayed on the screen during the horizontal scanning period as follows. The brightness transition is predicted from the video signal waveform. In the period on the dark side of the period in which the brightness transitions, the electron beam is accelerated so that the electron beam is horizontally scanned at a speed equal to or higher than the average scanning speed. On the other hand, in the brighter side of the period during which the brightness transitions, the electron beam is decelerated so that the electron beam is horizontally scanned at a speed equal to or lower than the average scanning speed. Therefore, on the screen, of the portion where the brightness transitions, the phosphor excitation time is shortened and the luminance is reduced in the dark portion, and the phosphor excitation time is increased and the luminance is increased in the bright portion. . Thus, the contour of the image is corrected so that the sharpness of the bright and dark transition portion increases.

  When such a BVM coil for modulating the horizontal scanning speed of the electron beam is provided integrally with the CPU, an eddy current is excited in the electron gun made of a metal conductor by the magnetic flux generated by the BVM coil, and the metal conductor generates heat. Thus, there is a problem that the speed modulation effect by the BVM coil is reduced.

  In order to improve the sensitivity of the BVM coil, a method has been proposed in which a magnetic body that focuses and strengthens the magnetic field generated by the BVM coil is mounted inside the electron gun (see Patent Document 2).

  However, this method is likely to cause a new eddy current because the magnetic material for focusing the magnetic field is a metal, and causes a cost increase because a new part welding process is required. However, there was a problem that sufficient sensitivity could not be obtained.

  Further, in order to reduce the crosstalk between the magnetic field generated from the BVM coil and the electron gun metal and to reduce the generation of eddy current as much as possible, the BVM coil may be arranged close to the electron gun side end of the deflection yoke. It is being considered. However, since the BVM coil approaches the horizontal deflection coil, there is a problem in that crosstalk with the horizontal deflection magnetic field increases and new ringing occurs. For this reason, there is a limit in bringing the BVM coil close to the deflection yoke, and there is a problem that sufficient sensitivity cannot be realized.

  As one of countermeasures, as shown in FIG. 9A, a method of strengthening the magnetic flux generated by the BVM coil by attaching a ring-shaped ferrite core 90 to the outer periphery of the BVM coil integrally with the CPU is devised. Has been.

  However, the ring-shaped ferrite core 90 simultaneously absorbs the vertical deflection magnetic field 92 generated by the deflection yoke 6 and, as indicated by the dotted line 94 in FIG. 9A, the vertical deflection magnetic field 92 on the neck portion side of the deflection yoke 6. (In FIG. 9A, the Z axis indicates the tube axis of the color picture tube). As a result, the preliminary deflection of the electron beam is reduced, and the upper and lower rasters 96 of the screen are distorted as shown by a dotted line 98 as shown in FIG. 9B, resulting in image distortion. In order to reduce this raster distortion, it is preferable that the ring-shaped ferrite core 90 be as thin as possible (reducing the dimension in the tube axis direction) and be located closer to the cathode.

  Therefore, a configuration in which the ring-shaped ferrite core 90 is arranged together with the CPU's 2, 4 and 6 pole magnet rings has been studied.

  In the assembly process of the color picture tube device, the 2, 4, 6-pole magnet ring of the CPU is fixed to maintain its position (rotation position around the tube axis) after adjusting the convergence and purity. As a fixing method of the CPU's 2, 4 and 6-pole magnet ring, there are a tightening fixing method in which a screw is fixed using a lock ring, and an elastic fixing method in which an elastic compression force is applied and fixed using an elastic ring having elasticity. Is known. In either system, the 2, 4, 6-pole magnet ring is fixed by receiving a compressive force in the tube axis direction.

By the way, the ring-shaped ferrite core 90 has a twist and a wave | undulation in the thickness direction (tube axial direction) by the sintering process in a manufacture process. Accordingly, when such a ring-shaped ferrite core 90 is fixed together with the 2, 4 and 6-pole magnet rings by the above-described tightening and fixing method, the ring-shaped ferrite core receives a compressive force in the tube axis direction when the lock ring is tightened. There was a problem that would break. Further, even when fixing by the elastic fixing method, there is a problem that the ring-shaped ferrite core is broken due to the elastic compressive force in the tube axis direction and the external force due to vibration during transportation. When the ring-shaped ferrite core is broken, the magnetic field strengthening effect of the BVM coil is reduced.
Japanese Utility Model Publication No.57-45650 JP-A-6-283113

  The present invention is for solving the above-described conventional problems, and the ring-shaped ferrite core for strengthening the magnetic field of the BVM coil attached together with the magnet ring of the CPU is hardly cracked, and the image quality is improved. An object is to provide a color picture tube apparatus.

  A color picture tube apparatus according to the present invention includes a panel having a phosphor screen formed on the inner surface thereof, a funnel joined to the panel, a color picture tube having an electron gun housed in a neck portion of the funnel, and the funnel A deflection yoke provided on the outer peripheral surface of the CPU, a CPU provided on the outer peripheral surface of the neck portion for adjusting color purity and color misregistration at the center of the screen, and provided at a position overlapping the CPU in the tube axis direction. A beam speed modulation coil that modulates a scanning speed in the horizontal direction of the electron beam emitted from the electron gun, and a ring-shaped ferrite core provided at a position overlapping the beam speed modulation coil in the tube axis direction. .

  The two surfaces perpendicular to the tube axis of the ring-shaped ferrite core are covered with a resin layer.

  According to the present invention, the two surfaces perpendicular to the tube axis of the ring-shaped ferrite core are covered with the resin layer, so that the geometric distortion of the ferrite core is eliminated and the mechanical strength is improved. Therefore, even if the compression force in the tube axis direction is applied and fixed together with the magnet ring of the CPU, the ferrite core does not break.

  Further, since the ring-shaped ferrite core is provided at a position overlapping the beam velocity modulation coil in the tube axis direction, the magnetic field generated by the beam velocity modulation coil is strengthened. As a result, the image quality is improved.

(Embodiment 1)
FIG. 1 is a configuration diagram of a color picture tube apparatus according to Embodiment 1 of the present invention. For convenience of the following description, the tube axis is the Z axis, the horizontal direction (long side direction of the screen) is the X axis, and the vertical direction (short side direction of the screen) is the Y axis. The X axis and the Y axis intersect on the Z axis. In FIG. 1, a sectional view is shown above the Z axis, and an external view is shown below.

  The color picture tube (CRT) includes an envelope composed of a panel 2 and a funnel 3 and an electron gun 4 provided in a neck portion 3 a of the funnel 3. The color picture tube device 1 includes this color picture tube and a deflection yoke 6 mounted on the outer peripheral surface of the funnel 3. On the inner surface of the panel 2, there is formed a phosphor screen 2a in which phosphor dots (or phosphor stripes) of blue (B), green (G), and red (R) are arranged. A shadow mask 5 is attached to the inner wall surface of the panel 2 so as to face the phosphor screen 2a. The shadow mask 5 is made of a metal flat plate in which a large number of substantially slot-shaped openings, which are electron beam passage holes, are formed by etching, and three electron beams 7 emitted from the electron gun 4 (three electron beams are X Since they are arranged on a straight line parallel to the axis, only one electron beam in the foreground is shown in the figure.) Passes through this aperture and strikes a predetermined phosphor. The deflection yoke 6 deflects the three electron beams 7 emitted from the electron gun 4 vertically and horizontally, and scans the phosphor screen 2a. The deflection yoke 6 includes a saddle type horizontal deflection coil 61, a saddle type vertical deflection coil 62, and a ferrite core 64. A resin insulating frame 63 is provided between the horizontal deflection coil 61 and the vertical deflection coil 62. The insulating frame 63 maintains the electrical insulation state between the horizontal deflection coil 61 and the vertical deflection coil 62 and plays a role of supporting both the deflection coils 61 and 62.

  FIG. 2 is a half sectional view showing the structure around the electron gun 4. In FIG. 2, reference numeral 10 denotes a CPU (Convergence and Purity Unit), which performs static convergence adjustment and purity adjustment of the electron beam at the center of the screen. The CPU 10 includes a two-pole magnet ring 11, a four-pole magnet ring 12, and a six-pole magnet ring 13. Each of the 2-pole, 4-pole, and 6-pole magnet rings 11, 12, and 13 is formed by superposing two annular magnets. Reference numeral 22 denotes a substantially cylindrical sleeve for holding the 2-pole, 4-pole, and 6-pole magnet rings 11, 12, and 13. A plurality of slits (cuts) are formed at the left end of the sleeve 22 in parallel with the Z axis, and are divided into a plurality of strip-shaped portions in the circumferential direction. The sleeve 22 is extrapolated on the outer periphery of the neck portion 3 a, and a metal band 25 having a substantially “Ω” shape is attached to the slit forming portion, and both ends thereof are tightened with a binding bolt 26, whereby the neck portion It is fixed on the outer peripheral surface of 3a.

  Reference numeral 20 denotes a pair of beam velocity modulation (BVM) coils provided substantially symmetrically across the XY plane. The winding is disposed along the outer peripheral surface of the sleeve 22 and generates a magnetic field in a substantially Y-axis direction. Since the operation of the BVM coil 20 is the same as that of the conventional one, its detailed description is omitted.

  Reference numeral 30 denotes a lock ring. On the inner peripheral surface of the lock ring 30, a female screw that engages with a male screw 22 a formed on the outer peripheral surface of the sleeve 22 is formed. After adjusting the static convergence and purity by adjusting the rotation angle around the Z-axis of the 2-pole magnet ring 11, the 4-pole magnet ring 12, and the 6-pole magnet ring 13 constituting the CPU 10, the lock ring 30 is adjusted. Tighten. Each of the magnet rings 11, 12, 13 of the CPU 10 is fixed by receiving a compressive force in the Z-axis direction between the lock ring 30 and the flange 22 b of the sleeve 22. That is, in the present embodiment, the 2-pole, 4-pole, and 6-pole magnet rings 11, 12, and 13 are fixed by a fastening method using the lock ring 30.

  Reference numerals 17 a, 17 b, and 17 c are resin spacer rings arranged between the two-pole magnet ring 11, the four-pole magnet ring 12, the six-pole magnet ring 13, and the lock ring 30. The spacer rings 17a, 17b, and 17c prevent the rotation of each of the two-pole magnet ring 11, the four-pole magnet ring 12, the six-pole magnet ring 13, and the lock ring 30 around the Z axis from being transmitted to adjacent members. To do.

  3A is an external perspective view of the lock ring 30, and FIG. 3B is a side view thereof. In the present embodiment, the lock ring 30 is resin-molded integrally with the ring core 70 so that the entire surface of the ring-shaped ferrite core (hereinafter referred to as “ring core”) 70 is covered with resin. 31 is a female screw formed on the inner peripheral surface of the lock ring 30, and is screwed with the male screw 22 a of the sleeve 22. Reference numeral 32 denotes four protrusions formed at equal angular intervals on the outer peripheral surface of the lock ring 30 and is gripped when the lock ring 30 is fastened and fixed to the sleeve 22.

  In one embodiment, the thickness of the lock ring 30 in the Z-axis direction is 4.5 mm, the inner diameter is 36 mm, and the outer diameter (excluding the protrusions 32) is 48 mm. The thickness of the ring core 70 was 2.5 mm, the inner diameter was 40 mm, and the outer diameter was 45 mm.

  The ring core 70 is manufactured by forming a ferrite powder into an annular shape and then sintering it. In this sintering step, twisting and undulation are generated in the thickness direction (Z-axis direction in FIG. 3B), and the flatness of the two surfaces orthogonal to the Z-axis is deteriorated. In the present embodiment, the ring core integrated lock ring 30 is used which is resin-molded so as to cover the entire surface of the ring core 70. Twists and undulations on the two surfaces orthogonal to the Z axis of the ring core 70 are absorbed by the resin layers 30a and 30b covering the two surfaces. By the general resin molding, the surfaces of the resin layers 30a and 30b having good flatness and parallelism can be easily obtained. Further, the mechanical strength of the lock ring 30 is improved as compared with the ring core 70 alone. Therefore, even if this ring core integrated lock ring 30 is used as a lock ring for fixing the magnet rings 11, 12, 13, the ring core 70 embedded in the lock ring 30 is cracked when the lock ring 30 is tightened. There is no problem.

  Further, since the position on the Z-axis where the lock ring 30 is mounted overlaps the range on the Z-axis where the BVM coil 20 exists, the magnetic field generated by the BVM coil 20 is strengthened by the ring core 70 and the image quality is improved. Is done. In one example, it was confirmed that the magnetic field of the BVM coil 20 can be enhanced by about 1.5 times compared to the case where the ring core 70 is not used.

  In addition, since the ring core 70 is integrated with the lock ring 30 disposed at a position farther than the magnet rings 11, 12, and 13 constituting the CPU 10 with respect to the deflection yoke 6, the vertical deflection generated by the vertical deflection coil 62. Absorption of the magnetic field by the ring core 70 is reduced. As a result, raster distortion (dotted line 98 in FIG. 9B) at the top and bottom of the screen can be reduced.

  In the above embodiment, an example in which the CPU 10 is fixed by the lock ring 30 integrally molded with the ring core 70 is shown, but the present invention is not limited to this. For example, at least one of the spacer rings 17a, 17b, and 17c may be replaced with a spacer ring 17 that is resin-molded integrally with the ring core 70 shown in FIGS. 4 (A) and 4 (B). 4A is a perspective view of the spacer ring 17, and FIG. 4B is a side view thereof. In this case, it is sufficient that at least two surfaces orthogonal to the Z axis of the ring core 70 are covered with the resin layers 18a and 18b. Twists and undulations on the two surfaces of the ring core 70 are absorbed by the resin layers 18a and 18b. By the general resin molding, the surfaces of the resin layers 18a and 18b having good flatness and parallelism can be easily obtained. In addition, the spacer ring 17 on which the resin layers 18a and 18b are formed has improved mechanical strength compared to the ring core 70 alone. Therefore, even if this spacer ring 17 is tightened with a lock ring, the ring core 70 does not break. Furthermore, by arranging the spacer ring 17 molded with resin integrally with the ring core 70 so that the position on the Z axis overlaps with the BVM coil 20, the magnetic field generated by the BVM coil 20 is strengthened by the ring core 70, and the image quality is improved. Is done. The lock ring used in combination with the spacer ring 17 may be the lock ring 30 that is resin-molded integrally with the ring core 70 shown in FIGS. 3 (A) and 3 (B). It may be a conventional lock ring not included.

  A thickness of the ring core 70 (dimension in the Z-axis direction) is sufficient to be about 2 to 3 mm. Therefore, by replacing at least one of the lock rings or spacer rings 17a, 17b, and 17c with a resin molded integrally with the ring core 70, the BVM coil 20 can be formed without causing an increase in the dimension of the CPU 10 in the Z-axis direction. The emitted magnetic field can be strengthened.

(Embodiment 2)
In the first embodiment, an example in which the present invention is applied to a color picture tube device equipped with a CPU in which 2-pole, 4-pole, and 6-pole magnet rings 11, 12, and 13 are fixed by a tightening force of a screw of a lock ring. Indicated. In the second embodiment, an example in which the present invention is applied to a color picture tube device equipped with a CPU in which 2-pole, 4-pole, and 6-pole magnet rings 11, 12, and 13 are fixed by the elastic force of the elastic ring is shown. .

  The color picture tube apparatus of the second embodiment is the same as the color picture tube apparatus 1 of the first embodiment shown in FIG. 1 except for the peripheral structure of the CPU 10. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 5 is a half sectional view showing the structure around the electron gun 4. In the present embodiment, the 2-pole, 4-pole, and 6-pole magnet rings 11, 12, and 13 constituting the CPU 10 are held by a substantially cylindrical sleeve 40.

  FIG. 6 is a schematic perspective view of the sleeve 40. A flange 41 is formed at one end of the sleeve 40, and a plurality of slits (cuts) 42 are formed at the other end parallel to the Z-axis, and are divided into a plurality of strip-shaped portions in the circumferential direction. ing. A locking claw 43 whose outer peripheral surface is inclined in a tapered shape is formed in a part of the plurality of strip-shaped portions.

  As shown in FIG. 5, on the outer peripheral surface of the sleeve 40, the two-pole magnet ring 11, the spacer ring 17a, the four-pole magnet ring 12, the spacer ring 17b, the six-pole magnet ring 13, and the spacer ring 17c are sequentially arranged from the flange 41 side. The elastic ring 50 and the stopper ring 19 are sequentially inserted. The sleeve 40 is extrapolated on the outer periphery of the neck portion 3 a, and a metal band 25 having a substantially “Ω” shape is attached to a portion where the slit 42 is formed, and both ends thereof are tightened with a binding bolt 26, whereby the neck portion It is fixed on the outer peripheral surface of 3a.

  7A is a front view of the elastic ring 50, and FIG. 7B is a side view of the elastic ring 50. The elastic ring 50 is formed with a pair of T-shaped portions on the outer peripheral edge. Each T-shaped portion includes a pair of arms 52 that are cantilevered. The free end of each arm 52 is displaced to one side in the Z-axis direction.

  The rotation angle about the Z axis of the 2-pole magnet ring 11, the 4-pole magnet ring 12, and the 6-pole magnet ring 13 constituting the CPU 10 in a state where the stopper ring 19 is arranged on the metal band 25 side of the locking claw 43. By adjusting, static convergence and purity are optimally adjusted. Thereafter, the stopper ring 19 is moved to the 2-, 4-, and 6-pole magnet rings 11, 12, and 13 side. After the inner peripheral surface of the stopper ring 19 elastically displaces the locking claw 43 of the sleeve 40 to the Z-axis side, the locking claw 43 engages with the inner peripheral edge of the stopper ring 19 and the stopper ring 19 is fixed to the sleeve 40. Is done. At this time, the arm 52 of the elastic ring 50 is elastically deformed in the Z-axis direction. Therefore, each of the magnet rings 11, 12, 13 of the CPU 10 is fixed between the stopper ring 19 and the flange 41 of the sleeve 40 by receiving a compressive force in the Z-axis direction based on the elastic recovery force of the arm 52. That is, in the present embodiment, the 2-pole, 4-pole, and 6-pole magnet rings 11, 12, and 13 are fixed by an elastic fixing method using the elastic ring 50.

  Here, as shown in FIGS. 7 (A) and 7 (B), the elastic ring 50 is resin-molded integrally with the ring core 70 so that the surface excluding the inner peripheral surface of the ring core 70 is covered with resin. Yes. Therefore, even if the two surfaces orthogonal to the Z-axis of the ring core 70 have twists and undulations in the thickness direction (Z-axis direction in FIG. 7B), the resin layers 50a and 50b covering these two surfaces are Absorb this. By the general resin molding, the surfaces of the resin layers 50a and 50b having good flatness and parallelism can be easily obtained. The elastic ring 50 has improved mechanical strength compared to the ring core 70 alone. Therefore, even if this ring core integrated elastic ring 50 is used as an elastic ring for fixing the magnet rings 11, 12, 13, the ring core 70 is broken by the compressive force in the Z-axis direction or external vibration during transportation. The problem such as does not occur. The inner peripheral surface of the ring core 70 may also be covered with resin.

  In one embodiment, the thickness of the elastic ring 50 in the Z-axis direction (excluding the protruding portion by the arm 52) is 4.5 mm, the inner diameter is 36 mm, and the outer diameter is 48 mm. The thickness of the ring core 70 was 2.5 mm, the inner diameter was 36 mm, and the outer diameter was 41 mm.

  Further, since the position on the Z-axis where the elastic ring 50 is mounted overlaps the range on the Z-axis where the BVM coil 20 exists, the magnetic field generated by the BVM coil 20 is strengthened by the ring core 70 and the image quality is improved. Is done. In one example, it was confirmed that the magnetic field of the BVM coil 20 can be enhanced by about 1.5 times compared to the case where the ring core 70 is not used.

  The arrangement order of the elastic rings 50 in the Z-axis direction is not limited to the example of FIG. 5, but as shown in FIG. 5, the arrangement is further away from the deflection yoke 6 than the magnet rings 11, 12, and 13 constituting the CPU 10. When arranged, absorption of the vertical deflection magnetic field generated by the vertical deflection coil 62 by the ring core 70 is reduced. As a result, raster distortion (dotted line 98 in FIG. 9B) at the top and bottom of the screen can be reduced.

  The elastic ring 50 may function as the stopper ring 19 and the stopper ring 19 may be omitted. In this case, the dimension of the CPU 10 in the Z-axis direction can be reduced.

  At least one of the spacer rings 17a, 17b, and 17c can be replaced with a ring core integrated elastic ring 50 shown in FIGS. 7 (A) and 7 (B). In this case, since the replaced spacer ring can be omitted, the dimension of the CPU 10 in the Z-axis direction can be reduced.

  In addition, at least one of the spacer rings 17a, 17b, and 17c may be replaced with a spacer ring 17 that is resin-molded integrally with the ring core 70 shown in FIGS. 4 (A) and 4 (B). In this case, the same effect as described in the first embodiment can be obtained. The stopper ring 19 may be replaced with a resin molded integrally with the ring core 70. In any case, the elastic ring 50 may be an elastic ring 50 molded integrally with the ring core 70 shown in FIGS. 7A and 7B, or a conventional ring core 70 that does not include the ring core 70. It may be an elastic ring.

  A thickness of the ring core 70 (dimension in the Z-axis direction) is sufficient to be about 2 to 3 mm. Therefore, by replacing at least one of the elastic ring, the spacer rings 17a, 17b, 17c, and the stopper ring 19 with a resin molded integrally with the ring core 70, the size of the CPU 10 in the Z-axis direction is not increased. The magnetic field generated by the BVM coil 20 can be strengthened.

(Embodiment 3)
In the first and second embodiments, the example in which two surfaces orthogonal to the Z axis of the ring core 70 are covered with the resin layer by resin molding integrally with the ring core 70 has been described. However, the present invention is not limited to this. For example, the ring core 70 may be housed in a housing obtained by resin molding in advance, so that two surfaces orthogonal to the Z axis of the ring core 70 may be covered with a resin layer.

  FIG. 8A is an exploded perspective view of the spacer ring 17 ′ according to the third embodiment, and FIG. 8B is a side view of the spacer ring 17 ′. The spacer ring 17 ′ is composed of a ring core 70 and a housing 80 that accommodates the ring core 70. The housing 80 includes a first member 81 and a second member 82 that are resin-molded. The ring core 70 is accommodated in a space formed when the first member 81 and the second member 82 are combined. At least one of the spacer rings 17a, 17b, and 17c shown in the first and second embodiments can be replaced with such a spacer ring 17 '.

  Also in the present embodiment, the two surfaces orthogonal to the Z-axis of the ring core 70 are covered with the resin layers 81a and 82a of the first and second members 81 and 82. By the general resin molding, the outer surfaces of the resin layers 81a and 82a having good flatness and parallelism can be easily obtained. In addition, the spacer ring 17 ′ in which the ring core 70 is housed in the housing 80 including the resin layers 81 a and 82 a has improved mechanical strength compared to the ring core 70 alone. Therefore, even if a compressive force in the Z-axis direction is applied to the spacer ring 17 ′ by the tightening and fixing method of the first embodiment or the elastic fixing method of the second embodiment, the ring core 70 does not break.

  8A and 8B, the casing 80 covers the entire outer surface of the ring core 70. However, the casing has resin layers 81a and 82a covering two surfaces orthogonal to the Z axis of the ring core 70. It is enough to have at least. For example, the housing 80 may expose the inner peripheral surface and / or outer peripheral surface of the ring core 70. Further, if the two surfaces orthogonal to the Z-axis of the ring core 70 are substantially covered with the resin layers 81a and 82a to such an extent that the ring core 70 can be prevented from being cracked by an external force, the ring core is partially formed on the resin layers 81a and 82a. An opening exposing 70 may be formed.

  8A and 8B show an example in which the ring core 70 housed in the housing is used as at least one of the spacer rings 17a, 17b, and 17c, the present invention is not limited to this. For example, at least one of the lock ring 30, the elastic ring 50, and the stopper ring 19 may be replaced with a ring core 70 housed in the housing.

  In the first, second, and third embodiments, the deflection yoke 6 and the CPU 10 are separated. However, when the two are integrated (for example, the insulating frame 62 and the sleeve 22 or 40 are integrated). The present invention can also be applied, and the same effects as described above can be obtained.

  The field of application of the color picture tube apparatus of the present invention is not particularly limited, and can be widely used for televisions, computer displays, and the like.

It is the figure which showed schematic structure of the color picture tube apparatus concerning Embodiment 1 of this invention. 1 is a half sectional view showing a configuration around a CPU of a color picture tube device according to a first exemplary embodiment of the present invention; 3A is a perspective view of the lock ring of the color picture tube device according to Embodiment 1 of the present invention, and FIG. 3B is a side view thereof. 4A is a perspective view of a spacer ring of the color picture tube device according to Embodiment 1 of the present invention, and FIG. 4B is a side view thereof. FIG. 6 is a half sectional view showing a configuration around a CPU of a color picture tube device according to a second exemplary embodiment of the present invention; It is the schematic perspective view which showed the sleeve of the color picture tube apparatus concerning Embodiment 2 of this invention. FIG. 7A is a perspective view of an elastic ring of a color picture tube device according to Embodiment 2 of the present invention, and FIG. 7B is a side view thereof. FIG. 8A is an exploded perspective view of the spacer ring of the color picture tube apparatus according to Embodiment 3 of the present invention, and FIG. 8B is a side view of the spacer ring. FIG. 9A is a vertical deflection magnetic field distribution diagram in the tube axis direction showing how the ring-shaped ferrite core absorbs and weakens the vertical deflection magnetic field. FIG. 9B is a diagram showing raster distortion caused by the ring-shaped ferrite core.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Color picture tube apparatus 2 Panel 2a Phosphor screen 3 Funnel 3a Neck part 4 Electron gun 5 Shadow mask 6 Deflection yoke 7 Electron beam 10 CPU
11 2 pole magnet ring 12 4 pole magnet ring 13 6 pole magnet rings 17, 17'17a, 17b, 17c Spacer rings 18a, 18b Resin layer 19 Stopper ring 20 Beam speed modulation (BVM) coil 22 Sleeve 22a Male thread 22b Flange 25 Metal Band 26 Bundling bolt 30 Lock ring 31 Female thread 32 Protrusion 40 Sleeve 41 Flange 42 Slit 43 Locking claw 50 Elastic ring 52 Arm 61 Horizontal deflection coil 62 Vertical deflection coil 63 Insulation frame 64 Ferrite core 70 Ring core (ring-shaped ferrite core)
80 housing

Claims (7)

A panel having a phosphor screen formed on the inner surface, a funnel joined to the panel, and a color picture tube having an electron gun housed in a neck portion of the funnel;
A deflection yoke provided on the outer peripheral surface of the funnel;
A CPU for adjusting color purity and color shift at the center of the screen provided on the outer peripheral surface of the neck portion;
A beam velocity modulation coil that is provided at a position overlapping with the CPU in the tube axis direction and modulates the horizontal scanning velocity of the electron beam emitted from the electron gun;
A color picture tube device comprising: a ring-shaped ferrite core provided at a position overlapping with the beam velocity modulation coil in the tube axis direction;
A color picture tube apparatus characterized in that two surfaces perpendicular to the tube axis of the ring-shaped ferrite core are covered with a resin layer.   The color picture tube device according to claim 1, wherein the CPU includes a plurality of pairs of magnet rings and a lock ring for fixing the magnet rings, and the lock ring includes the ring-shaped ferrite core.   2. The CPU according to claim 1, wherein the CPU includes a plurality of pairs of magnet rings and an elastic ring for fixing the magnet rings by applying an elastic compressive force in a tube axis direction, and the elastic ring includes the ring-shaped ferrite core. The color picture tube apparatus as described.   2. The color picture tube device according to claim 1, wherein the CPU includes a plurality of pairs of magnet rings and a spacer ring disposed therebetween, and at least one of the spacer rings includes the ring-shaped ferrite core.   The color picture tube apparatus according to claim 1, wherein the ring-shaped ferrite core and the resin layer are integrated by resin molding.   The color picture tube device according to claim 1, wherein the ring-shaped ferrite core is housed in a housing including the resin layer.   The color picture tube apparatus according to claim 1, wherein the ring-shaped ferrite core is disposed farther from the deflection yoke than a magnet ring constituting the CPU.

Images