JP2006190519A - Color picture tube device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a color picture tube device capable of optimally tuning YV or vertical trapezoidal distortion even in the color picture tube device having a vertical deflecting coil of a toroidal coil. <P>SOLUTION: A ferrite core 6 is divided into an upper core 7 and a lower core 8, the vertical deflecting coil is toroidally wound on the upper core 7 and the lower core 8, the vertical deflecting coil is divided into four parts partitioned with an X axis and a Y axis and wound, a coil wound on the upper core 7 and a coil wound on the lower core 8 are opposite in the winding direction, the coil wound on the upper core is connected through intermediate taps 53, 54, the coil wound on the lower core 8 is connected through intermediate taps 57, 58, two coils 49, 50 on the right side more than the Y axis are connected, a variable resistance 60 is connected between the intermediate taps 54, 57, and the amount of current of a coil group 62 connected to the coils 49, 50 is made adjustable. <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, and more particularly to a deflection yoke of an inline type color picture tube.

  In the cathode ray tube device, a deflection yoke is provided so as to surround the outer periphery of a cone portion of a funnel-shaped glass funnel that constitutes a vacuum envelope. The three electron beams emitted from the electron gun are deflected by the horizontal and vertical deflection magnetic fields generated by the deflection yoke, and a color image is displayed by scanning the phosphor screen horizontally and vertically via a shadow mask. Will be. The deflection yoke includes a vertical deflection coil and a horizontal deflection coil, and the vertical deflection coil is usually wound around a ferrite core (hereinafter referred to as “core”).

  FIG. 4 is a cross-sectional view of an example of a core around which a conventional vertical deflection coil is wound. FIG. 4 shows an example of a saddle-toroidal deflection yoke (STDY). The horizontal deflection coil is a saddle coil (not shown) formed by mold winding, and the vertical deflection coil 61 is a toroidal coil wound directly around the ferrite core 60. Since the core 60 is vertically divided, the vertical deflection coil 61 is a vertically divided coil.

  Here, the reason why the core of the toroidal coil is divided in the vertical direction will be described. First, the winding of the toroidal coil of the vertical deflection coil is wound in a region excluding the vicinity of ± 20 ° from the horizontal axis (X axis) to obtain an optimum magnetic field distribution. The toroidal coil is wound with one of the divided cores held on one of the divided surfaces. In order to secure the space of the winding holding mechanism, there is a range (referred to as a dead zone) in which the winding cannot be performed by 18 ° from the dividing plane.

  In this dead zone, when the core is divided into left and right sides, the dividing plane becomes the vertical axis (Y axis), and winding cannot be performed ± 18 ° from the vertical axis, and winding near the vertical axis becomes impossible, and the desired magnetic field Distribution cannot be obtained.

  On the other hand, when the core is divided into upper and lower parts, the dividing surface becomes the horizontal axis, and winding cannot be performed at ± 18 ° from the horizontal axis. However, as described above, the winding of the toroidal coil is observed around ± 20 ° from the horizontal axis. Since a winding distribution is required in the region, a desired magnetic field distribution can be obtained.

  Next, YV and trapezoidal distortion adjustment using a differential resistor will be described. Note that YV is a misconvergence pattern, and is a pattern in which R (red) and B (blue) are misaligned in the upper or lower part on the Y axis without overlapping. When the vertical coil is a saddle coil, it does not require a core and is a left-right split type. For this reason, as shown in FIG. 5, the left saddle coil 11 and the right saddle coil 12 can be connected in series, and the balance of the current flowing in the left and right coils can be changed by the differential resistor 13. As a result, a left-right tilt effect can be provided in a pseudo manner for the vertical coil.

  According to this configuration, YV misconvergence and vertical trapezoidal distortion can be varied, and as a result, YV and trapezoidal distortion generated when a cathode ray tube and a deflection yoke are combined can be optimally adjusted.

  As another technique, there is a technique for suppressing noise called ringing generated by a voltage induced from a horizontal coil to a vertical coil by connecting a damping resistor in parallel to the vertical coil to form a noise component filter. .

  In particular, in Patent Document 1, a winding method called the multilayer winding method that returns to the initial winding position for each layer winding, an intermediate tap is taken out in the middle of the winding, and a damping circuit by a resistor and a capacitor is connected. Thus, a technique for removing ringing has been proposed.

  Next, as described above, the toroidal coil is vertically divided by the core. In this configuration, in order to vary the YV misconvergence and the upper and lower trapezoidal distortion, it is conceivable to divide the upper and lower coils into left and right with an intermediate tap. In this case, the upper and lower coil wirings are connected so as to be symmetric, and the balance of the current flowing in the left and right coils is changed by the differential resistance. In this case, the winding is usually toroidally wound in the same direction without distinction between the upper coil and the lower coil.

  There are two types of connections: the connection shown in FIG. 6 and the connection shown in FIG.

  FIG. 6A is a cross-sectional view of the core for showing the winding state, and FIG. 6B shows a connection diagram. In the connection shown in FIG. 6, the upper core left coil 14 and the lower core left coil 15 are connected via the intermediate tap 19 and the lower core winding end line 20. For this reason, the current from the upper core winding start wire 18 flows in order through the upper core left coil 14 and the lower core left coil 15.

  Further, the intermediate tap 21 and the intermediate tap 22 are connected, and the upper core right coil 16 and the lower core right coil 17 are connected via the upper core winding end line 23 and the intermediate tap 24. For this reason, the current from the intermediate tap 21 flows in the order of the upper core right coil 16 and the lower core right coil 17 and goes out from the lower core winding start 25 line. Alternatively, the lower core winding start 25 line may be used as the current inlet, and the current may be flowed in the opposite manner.

  In the connection of FIG. 7A, the intermediate tap 31 and the upper core winding start line 32 are connected. For this reason, the current from the lower core winding end wire 30 flows through the lower core left coil 26 and the upper core left coil 27 in this order. The intermediate tap 33 and the intermediate tap 34 are connected, and the lower core right coil 28 and the upper core right coil 29 are connected via the lower core winding start line 35 and the intermediate tap 36.

  For this reason, the current from the intermediate tap 33 flows in the order of the lower core right coil 28 and the upper core right coil 29 and then flows out from the upper core winding end line 37 to another circuit. Alternatively, the upper core winding end line 37 may be used as an entrance for current, and the current may flow in the opposite direction.

  6B, the upper left coil 14 and the lower left coil 15 form a left coil group 38, and the upper right coil 16 and the lower right coil 17 form a right coil group 39. . In this configuration, YV adjustment and upper and lower trapezoidal distortion can be adjusted by adjusting the current balance to the left coil group 38 and the right coil group 39 by the differential resistor 40.

  Similarly, in the connection of FIG. 7B, the left coil group 43 and the right coil group 44 are formed, the current balance is adjusted by the differential resistor 45, and YV adjustment and upper and lower trapezoidal distortion can be adjusted.

In the connection of FIG. 6B, a damping effect is achieved by connecting 100Ω fixed resistors 41 and 42 in parallel to the left coil group 38 and the right coil group 39, respectively. In the connection shown in FIG. 7B, a damping effect is achieved by connecting 100Ω fixed resistors 46 and 47 in parallel to the left coil group 43 and the right coil group 44, respectively.
JP-A-6-139959

  However, in the conventional connection as described above, there is a problem that the voltage difference at the left and right coil division positions of the upper and lower cores is larger than the other interlayer voltage difference, and ringing phenomenon occurs due to this voltage difference. . In addition, with multi-layer winding, it is difficult to divide the coil into left and right, and there is a problem that YV misconvergence and vertical trapezoidal distortion cannot be adjusted.

  The present invention solves the above-described conventional problems. In a color picture tube having a vertical deflection coil of a toroidal coil, a color image that can reduce YV misconvergence and upper and lower trapezoidal distortion while suppressing ringing. The purpose is to provide a tube.

In order to achieve the above object, a color picture tube apparatus of the present invention comprises a cathode ray tube and a deflection yoke arranged so as to surround the outside of the cathode ray tube, and three electron beams emitted from an electron gun are provided. A color picture tube apparatus which forms a color image on a screen by being deflected by a horizontal deflection magnetic field and a vertical deflection magnetic field from the deflection yoke, the deflection yoke comprising a horizontal deflection coil, a vertical deflection coil, and a ferrite core The ferrite core is divided into an upper core and a lower core, and the vertical deflection coil is toroidally wound on each of the upper core and the lower core, and the tube axis of the cathode ray tube When the axis of the screen vertical direction passing through the Y axis is the Y axis and the axis of the screen horizontal vertical direction passing through the tube axis is the X axis, when the ferrite core is viewed from the screen side, The vertical deflection coil is divided into four parts that are partitioned by the X axis and the Y axis, and is wound between the coil wound around the upper core and the coil wound around the lower core. The direction of the coil is reversed, and the coil wound around the upper core is connected via a first intermediate tap, and the coil wound around the lower core is connected via a second intermediate tap. When the ferrite core is viewed from the screen side, two coils on either the right side or the left side of the Y-axis are connected to each other among the coils divided into the four parts. And
A variable resistor is connected between the first intermediate tap and the second intermediate tap, and a current amount of a coil group in which the two coils are connected can be adjusted.

  According to the present invention, it is possible to reduce YV misconvergence and vertical trapezoidal distortion while suppressing ringing even in a color picture tube provided with a vertical deflection coil of a toroidal coil.

  Since the color picture tube device of the present invention connects two adjacent coils in the upper and lower cores via an intermediate tap and can adjust the current amount of the right coil group or the left coil group in which the coils are connected to each other. YV misconvergence and vertical trapezoidal distortion can be reduced while suppressing ringing.

  In the color picture tube apparatus of the present invention, two coils on the right side of the Y axis are connected to form a right coil group, and the coil divided into the four parts is viewed from the screen side. Sometimes, the coil wound in the region on the left side of the Y axis and above the X axis is the upper core left coil, and the coil wound on the region on the left side of the Y axis and below the X axis is the lower core left coil Then, it is preferable that the vertical deflection current flows in the order of the upper core left coil, the right coil group, and the lower core left coil or vice versa.

  Further, it is preferable that a fixed resistor is connected in parallel to the upper core left coil and the lower core left coil. According to this configuration, the balance adjustment range of the left and right coils can be changed.

  In addition, two coils on the left side of the Y axis are connected to form a left coil group, and when the coil divided into the four parts is viewed from the screen side, When the coil wound in the region above the axis is the upper core right coil, and the coil wound in the region right from the Y axis and below the X axis is the lower core right coil, the vertical deflection current is It is preferable that the lower core right coil, the left coil group, and the upper core right coil flow in this order or vice versa.

  Moreover, it is preferable that a fixed resistor is connected in parallel to the lower core right coil and the upper core right coil. According to this configuration, the balance adjustment range of the left and right coils can be changed.

  The ferrite core is preferably a slot core having a convex portion formed on the inside. According to this configuration, the core can be brought closer to the cathode ray tube as compared with the configuration in which the convex portion is not provided, so that the deflection sensitivity can be increased, which is advantageous in reducing the deflection power. In addition, the magnetic flux is hardly interlinked with the coil, and the eddy current loss is reduced, so that the heat generation of the deflection yoke can be reduced.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a color picture tube apparatus according to an embodiment of the present invention. The color picture tube apparatus shown in this figure includes a cathode ray tube 1 and a deflection yoke 2. The cathode ray tube 1 includes an envelope and components attached thereto. The envelope is composed of a front flat panel 3 having a screen surface formed on the inner surface and a funnel-shaped funnel 4. In the neck portion 4a of the funnel 4, an electron gun 3 that emits three electron beams is installed.

  Further, a deflection yoke 2 and a convergence yoke 5 are mounted so as to surround the outside of the funnel 4. The deflection yoke 2 includes a horizontal deflection coil and a vertical deflection coil, and three electron beams emitted from the electron gun 3 are horizontally and vertically deflected by horizontal and vertical deflection magnetic fields generated therefrom. . As a result, the three electron beams are scanned horizontally and vertically on the screen surface via a shadow mask (not shown), and a color image is displayed.

  In the following description, an axis in the screen vertical direction passing through the tube axis (Z axis) of the cathode ray tube 1 is defined as a Y axis, and an axis in the horizontal direction passing through the tube axis is defined as an X axis. The right and left sides are based on the Y axis when the deflection yoke 2 is viewed from the screen side. The upper and lower sides are based on the X axis.

  Before explaining the details of the present invention, the ringing phenomenon mentioned as a problem in the conventional connection as shown in FIGS. In the connection diagram of FIG. 6B, the vertical deflection current that has entered the upper core winding start line 18 is generated by the upper core left coil 14, the lower core left coil 15, the upper core right coil 16, and the lower core right coil 17. It flows in order and exits from the lower core winding end line 25.

Here, as shown in FIG. 6A, the upper core left coil 14 and the upper core right coil 16 are wound adjacent to each other on the upper core, and the distance between the windings of both coils is as follows. It is getting smaller. On the other hand, in the connection circuit, the upper core left coil 14 and the upper core right coil 16 are not directly connected, and the lower core left coil 15 is interposed between the two coils. ), A large voltage difference far exceeding the interlayer voltage is generated between two adjacent coils of the upper core. The interlayer voltage is a voltage difference between the Nth coil (N is an integer from 1 to 4) and the N + 1th coil when the four coils are numbered in the order of current flow.

Further, as shown in FIG. 6A, the lower core left coil 15 and the lower core right coil 17 are wound adjacently on the lower core, and between the windings of both coils. The distance is getting smaller. On the other hand, as a connection circuit, the lower core left coil 15 and the lower core right coil 17 are not directly connected, and the upper core right coil 16 is interposed between the two coils. For this reason, the lower core also has a large voltage difference that far exceeds the interlayer voltage between two adjacent coils. As described above in the example of FIG. 6, the example of FIG. The same voltage between the adjacent upper core left coil 27 and the upper core right coil 29 and between the adjacent lower core left coil 26 and the lower core right coil 28 is much higher than the interlayer voltage. There is a difference.

  That is, in either of the configurations of FIGS. 6 and 7, the left and right coils of the upper core and the left and right coils of the lower core have a large voltage difference exceeding the interlayer voltage while the left and right coils are adjacent to each other. Thus, a high voltage difference is generated at the intermediate tap position. This causes the ringing phenomenon.

  Hereinafter, an embodiment of the present invention will be described in detail. FIG. 2A is a cross-sectional view of a core portion around which a vertical deflection coil is wound in the deflection yoke according to the present embodiment. FIG. 2A is a cross-sectional view of the core as viewed from the screen side. FIG. 2B shows a connection diagram of the vertical deflection coil shown in FIG.

  FIG. 2 shows an example of a saddle-toroidal deflection yoke (STDY). The horizontal deflection coil is a saddle coil (not shown) formed by mold winding, and the vertical deflection coil is a toroidal coil wound directly around the core 6. Since the core 6 is divided into an upper core 7 and a lower core 8, the vertical deflection coil is a vertically divided coil.

  In the configuration of FIG. 2, the winding direction to the upper core 7 and the winding direction to the lower core 8 are reversed. For this reason, when the core 6 is viewed from the screen side as shown in FIG. 2A, when a current flows from the outer peripheral side to the inner peripheral side of the upper core 7 in the winding to the upper core 7 In the winding of the lower core 8, a current flows from the inner peripheral side of the lower core 8 toward the outer peripheral side. Thus, the electron beam can be deflected in the vertical direction (Y-axis direction), and each coil functions as a vertical deflection coil.

  2A and 2B, the upper core left coil 48 and the upper core right coil 49 are connected via an intermediate tap 53 and an intermediate tap 54, and the winding of the upper core 7 is the intermediate tap 53. , 54 are divided into left and right. According to this connection, the vertical deflection current that has entered the upper core left coil 48 from the winding start line 52 of the upper core flows into the upper core right coil 49 through the intermediate taps 53 and 54.

  The upper core right coil 49 and the lower core right coil 50 are connected via an upper core winding end line 55 and a lower core winding start line 56 to form a right coil group 62. Further, the lower core right coil 50 and the lower core left coil 51 are connected via intermediate taps 57 and 58, and the winding of the lower core 8 is divided into right and left via the intermediate taps 57 and 58. Has been.

  According to this connection, the vertical deflection current that has entered the winding start line 56 of the lower core from the winding end line 55 of the upper core passes through the intermediate tap 57 and the intermediate tap 58, and passes through the lower core right coil 50 and the lower core. The left coil 51 flows in this order. Thereafter, a vertical deflection current comes out from the winding end line 59 of the lower core.

  A variable resistor 60 is connected between the intermediate tap 54 and the intermediate tap 57. That is, the variable resistor 60 is connected in parallel with the upper core right coil 49 and the lower core right coil 50 that form the right coil group 62. The variable resistor 60 is a 100Ω variable resistor, for example. As a result, the amount of current in the right coil group 62 can be adjusted, so that the current balance between the right coil group 62 and the left coil group (the upper core left coil 48 and the lower core left coil 51) can be adjusted.

  In the example of FIG. 2B, a fixed resistor 61 is connected in series with the variable resistor 60 in order to limit balance adjustment. The fixed resistor 61 is, for example, 100Ω in the example in which the variable resistor 60 is 100Ω. Further, the balance adjustment range may be changed by connecting a fixed resistor in parallel to each of the upper core left coil 48 and the lower core left coil 51 of the left coil group.

  According to the connection shown in FIG. 2, the voltage difference between two adjacent coils in the upper and lower cores 7 and 8 is merely an interlayer voltage, and as a result, the occurrence of ringing is suppressed.

  FIG. 3 is a diagram showing a winding state according to another example of the present embodiment. FIG. 3A is a cross-sectional view of the core as viewed from the screen side. FIG. 3B shows a connection diagram of the vertical deflection coil shown in FIG. 3 (a) and 3 (b), the lower core right coil 63 and the lower core left coil 64 are connected via an intermediate tap 68 and an intermediate tap 69, and the winding of the lower core 8 is It is divided into left and right via intermediate taps 68 and 69. According to this connection, the vertical deflection current that has entered the lower core right coil 63 from the winding start line 67 of the lower core 8 flows to the lower core left coil 64 via the intermediate taps 68 and 69, and the lower core It will go out from the winding end line 70 of 8.

  The winding end wire 70 of the lower core left coil 64 and the winding start wire 71 of the upper core left coil 65 are connected to form a left coil group 77. The upper core left coil 65 and the upper core right coil 66 are connected via an intermediate tap 72 and an intermediate tap 73. Thus, the winding of the upper core 7 is divided into left and right via the intermediate taps 72 and 73.

  According to this connection, the vertical deflection current that has entered the upper core left coil 65 from the winding start line 71 of the upper core left coil 65 flows through the intermediate taps 72 and 73 to the upper core right coil 66, and the upper core right coil. The vertical deflection current comes out from the winding end line 74 of 66.

  As shown in FIG. 3B, the variable resistor 75 is connected between the intermediate tap 69 and the intermediate tap 72. That is, the variable resistor 75 is connected in parallel with the upper core left coil 65 and the lower core left coil 64 forming the left coil group 77. The variable resistor 75 is, for example, a 100Ω variable resistor. Thereby, since the amount of current of the left coil group 77 can be adjusted, the current balance between the left coil group 77 and the right coil group (the upper core right coil 66 and the lower core right coil 63) can be adjusted.

  In the example of FIG. 3B, a fixed resistor 76 is connected in series with the variable resistor 75 in order to limit the balance adjustment. In the example in which the variable resistor 75 is set to 100Ω, the fixed resistor 76 is, for example, 100Ω. Further, the balance adjustment range may be changed by connecting a fixed resistor in parallel to each of the upper core right coil 66 and the lower core left coil 63 of the right coil group.

  In the connection shown in FIG. 3, as in the connection in FIG. 2, the voltage difference between two adjacent coils in the upper and lower cores 7 and 8 is merely an interlayer voltage, and as a result, occurrence of ringing is suppressed. become.

  2 and 3, the order of current flow may be reversed from the above description.

  Further, as the upper core 7 and the lower core 8, slot cores provided with protrusions protruding in the tube axis direction on the inner surface may be used. In this case, the vertical deflection coil is wound around the concave portion between the convex portions. According to this configuration, the core can be brought closer to the cathode ray tube as compared with the configuration in which the convex portion is not provided, so that the deflection sensitivity can be increased, which is advantageous in reducing the deflection power. In addition, the magnetic flux is hardly interlinked with the coil, and the eddy current loss is reduced, so that the heat generation of the deflection yoke can be reduced.

  As described above, since the present invention can optimally adjust YV and upper and lower trapezoidal distortion even in a toroidal coil, it is useful as a color picture tube device used in, for example, a television and a computer display.

1 is an external view of a color picture tube according to an embodiment of the present invention. It is a figure which shows the winding state which concerns on one embodiment of this Embodiment, (a) is sectional drawing when a core is seen from the screen side, (b) is a connection diagram of the vertical deflection coil shown to (a) . It is a figure which shows the winding state of the core which concerns on another embodiment of this Embodiment, (a) is sectional drawing when a core is seen from the screen side, (b) is the vertical deflection coil shown to (a) Connection diagram. Sectional drawing of an example of the core around which the conventional vertical deflection coil was wound. The connection diagram of an example of the conventional vertical saddle coil. It is a figure which shows the winding state of the conventional core, (a) is sectional drawing when a core is seen from the screen side, (b) is a connection diagram of the vertical deflection | deviation coil shown to (a). It is a figure which concerns on another example of the winding state of the conventional core, (a) is sectional drawing when a core is seen from the screen side, (b) is a connection diagram of the vertical deflection coil shown to (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cathode ray tube 2 Deflection yoke 3 Electron gun 6 Core 7 Upper core 8 Lower core 48, 65 Upper core left coil 51, 64 Lower core left coil 49, 66 Upper core right coil 50, 63 Lower core right coil 53, 54, 57, 58, 68, 69, 72, 73 Intermediate tap 60, 75 Variable resistance 61, 76 Fixed resistance

Claims (6)

A cathode ray tube and a deflection yoke arranged so as to surround the outside of the cathode ray tube, and three electron beams emitted from the electron gun are deflected by a horizontal deflection magnetic field and a vertical deflection magnetic field from the deflection yoke. A color picture tube device for forming a color image on a screen,
The deflection yoke includes a horizontal deflection coil, a vertical deflection coil, and a ferrite core, and the ferrite core is divided into an upper core and a lower core,
The vertical deflection coil is toroidally wound on each of the upper core and the lower core,
When the axis in the screen vertical direction passing through the tube axis of the cathode ray tube is the Y axis and the axis in the screen horizontal vertical direction passing through the tube axis is the X axis, the vertical deflection is obtained when the ferrite core is viewed from the screen side. The coil is wound by being divided into four parts partitioned by the X-axis and the Y-axis,
The winding direction is reversed between the coil wound around the upper core and the coil wound around the lower core,
The coil wound around the upper core is connected via a first intermediate tap, and the coil wound around the lower core is connected via a second intermediate tap,
When the ferrite core is viewed from the screen side, among the coils divided into the four parts, two coils on either the right side or the left side of the Y axis are connected to each other,
A color picture tube characterized in that a variable resistor is connected between the first intermediate tap and the second intermediate tap, and the current amount of the coil group in which the two coils are connected can be adjusted. apparatus.   Two coils on the right side of the Y axis are connected to each other to form a right coil group. When the coil divided into the four parts is viewed from the screen side, on the left side of the Y axis from the X axis When the coil wound in the upper region is the upper core left coil, and the coil wound in the region left from the Y axis and lower than the X axis is the lower core left coil, the vertical deflection current is The color picture tube device according to claim 1, wherein the picture tube device flows in the order of the left coil, the right coil group, and the lower core left coil or vice versa.   The color picture tube apparatus according to claim 2, wherein a fixed resistor is connected in parallel to the upper core left coil and the lower core left coil.   Two coils on the left side of the Y axis are connected to form a left coil group. When the coil divided into the four parts is viewed from the screen side, it is on the right side of the Y axis and from the X axis. When the coil wound in the upper region is the upper core right coil, and the coil wound in the region right from the Y axis and lower than the X axis is the lower core right coil, the vertical deflection current is 2. The color picture tube apparatus according to claim 1, wherein the color picture tube apparatus flows in the order of the core right coil, the left coil group, and the upper core right coil or in reverse order thereof.   The color picture tube apparatus according to claim 4, wherein a fixed resistor is connected in parallel to the lower core right coil and the upper core right coil.   6. The color picture tube device according to claim 1, wherein the ferrite core is a slot core having a convex portion formed inside.

Images