JP3465269B2 - Electron beam deflector - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electron beam deflecting device combined with a cathode ray tube used for a television receiver or the like. 2. Description of the Related Art When electron beams are deflected in the horizontal direction as misconvergence on a cathode ray tube screen, the amount of red and blue deflection at both ends of three electron beams arranged in a horizontal row. Is slightly different, and the horizontal direction of the red line and the blue line is largely shifted on both right and left sides of the screen. Hereinafter, misconvergence of a conventional deflection yoke will be described. For example, as shown in FIG. 7, at the left end on the screen, the red line 1 is shifted so as to be located to the left with respect to the blue line 2, and similarly, at the right end on the screen,
The red line 1 is shifted to the left with respect to the blue line 2. As a countermeasure against this kind of misconvergence, there is the following method. As shown in FIG. 8, a wedge 6 is provided between the liner portion 4 of the insulating frame 3 and the horizontal deflection coil 5.
To deform the horizontal deflection coil 5. Further, as shown in FIG. 9, a piece of silicon steel plate 7 is attached to one side of the deflection yoke. [0005] In such a conventional configuration, it is difficult to eliminate both the center and the upper and lower ends of the lateral misconvergence as shown in FIG. That is, even if the red line 1 and the blue line 2 coincide with each other at the center, they are shifted left and right at the upper end and the lower end, and the red line 1 and the blue line 2 are located on the right side of the screen as shown in FIG. Or, only one of the left side matches, one side is red line 1 and blue line 2
In some cases, the misalignment cannot be eliminated, and there is a problem that misconvergence cannot be reduced. In order to achieve the above object, according to the present invention, a current rectifying portion is constituted by a U-shaped magnetic body and a magnet, and the magnetic legs of the U-shaped magnetic body are arranged in opposite directions. A first coil and a second coil wired to generate a magnetic flux are inserted, and a horizontal deflection coil is connected to a midpoint where the first coil and the second coil are connected in series, and a horizontal deflection current flows. When the first coil and the second coil generate a magnetic flux in the opposite direction for each half-wave, respectively, the inductance is controlled for each half-wave by the sum of the magnetic flux generated by the magnet and the magnetic flux generated in the opposite direction. The current is shunted and the current controller
A first bobbin with a first solenoid coil and a second solenoid coil wound at both ends, respectively, and a second bobbin with a third solenoid coil and a fourth solenoid coil wound at both ends, respectively, comprising a first solenoid coil and a second solenoid The first coil is connected to the midpoint where the coils are connected, the second coil is connected to the midpoint where the third solenoid coil and the fourth solenoid coil are connected, and a magnetic core is provided in the hollow portion of each bobbin. By moving the position of the magnetic core, the current flowing between the first solenoid coil and the second solenoid coil and between the third solenoid coil and the fourth solenoid coil is adjusted, respectively, and the driving unit is displayed on the screen of the CRT. Right and left red line, two U-shaped magnetic bodies arranged opposite to each other according to the left and right of the screen to correct the deviation of the blue line Each of the magnetic leg of the該Ko-shaped magnetic body
On the other hand, the first and second sub-coils and the third sub-coil wound in the first direction, the second sub-coil and the fourth sub-coil wound in the second direction, the horizontal deflection flowing through the first coil The magnetic poles generated by the first sub-coil and the third sub-coil due to the current flowing are N pole on the upper left side, S pole on the lower left side, S pole on the right side, and N pole on the lower right side when viewed from the screen of the CRT. The magnetic poles generated by the second sub-coil and the fourth sub-coil due to the flow of the horizontal deflection current flowing through the second coil are S pole at the upper left, N pole at the lower left, N pole at the upper right, and S pole at the lower right. The other end of the first solenoid coil and the first sub coil, the other end of the second solenoid coil and the second sub coil, the other end of the third solenoid coil and the third sub coil, the other end of the fourth solenoid coil and the fourth sub coil are provided. Each Characterized in that connected in series. According to this structure, the horizontal deflection current is positive and the second coil of the current rectification unit moves to the left on the screen, and if the horizontal deflection current is negative, the second coil of the current rectification unit moves to the right on the screen. A large amount of current flows in one coil, and the horizontal deflection current flowing in each solenoid coil of the current control unit is converted to the hollow part of the bobbin according to the state of color shift of the red line or blue line of each electron beam on the left and right of the screen. The convergence can be reduced by the magnetic field generated from the sub-coil of the drive unit by adjusting the magnetic core inserted in the drive unit. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram of the electron beam device. In the figure, reference numeral 8 denotes a horizontal deflection coil, 9 denotes a current rectification unit, and includes a first coil 10 and a second coil 11. Reference numeral 12 denotes a current control unit, which includes a first solenoid coil 13, a second solenoid coil 14, a third solenoid coil 15, and a fourth solenoid coil 16. 17
Is a drive unit, which is a first subcoil 18, a second subcoil 19, a third subcoil 20, and a fourth subcoil 21, each of which has four coils. The horizontal deflection current flowing from the horizontal deflection coil 8 is connected to the first coil 10 and the second coil 11 of the current rectifier 9 so as to be divided. The structure of the current rectifier 9 will be described with reference to FIG. In the figure, 22 is a magnet, 2
Reference numeral 3 denotes a U-shaped magnetic body, which is configured by inserting a first coil 10 and a second coil 11 into a U-shaped magnetic body 23. Next, the operation of the current rectifier 9 will be described. The operation when the horizontal deflection current is positive is shown in FIG. The first coil 10 is wired so that the magnetic flux φ1 is generated in the direction of the arrow and the second coil 11 is generated such that the magnetic flux φ2 is generated in the direction opposite to the magnetic flux φ1. At this time, the direction of the magnetic flux φm of the magnet 22 is the same as the direction of the magnetic flux φ1 of the first coil 10. Accordingly, a magnetic flux of magnetic flux φ1 + magnetic flux φm is generated in the first coil 10, and a magnetic flux of magnetic flux φ2-magnetic flux φm is generated in the second coil 11. Accordingly, the inductance of the first coil 10 increases, and the inductance of the second coil 11 decreases. The larger the inductance, the harder the current flows. Therefore, when the horizontal deflection current is positive, the current hardly flows through the first coil 10 and easily flows through the second coil 11. The operation when the horizontal deflection current is negative is shown in FIG. 3b. The direction of the magnetic flux φm of the magnet 22 is the same as that when the horizontal deflection current is positive. The direction of the magnetic flux φ1 of the first coil 10 is generated in the opposite direction to the magnetic flux φm of the magnet 22,
In the second coil 11, the magnetic flux φ2 is in the same direction as the magnetic flux φm of the magnet 22. Therefore, the function of the magnetic flux and the inductance generated in each coil occurs. When the horizontal deflection current is negative, the current easily flows through the first coil 10 and the current hardly flows through the second coil 11. The convergence in the left half of the screen is governed by the positive half-wave of the horizontal deflection current, and the convergence in the right half is governed by the negative half-wave of the horizontal deflection current. Therefore, the inductance of the second coil 11 through which the current of the rectifier 2 flows easily is affected by the inductance of the first coil 10 on the left half of the television screen, and the inductance of the first coil 10 is affected by the right half. Next, the horizontal deflection current split by the current rectifier 9 flows to the current controller 12. 4A is an external view of the current control unit 12, and FIG. 4B is a cross-sectional view. In the figure, reference numeral 24 denotes a bobbin, the first solenoid coil 13 and the second solenoid coil 14 are mounted on both ends of the bobbin 24, a magnetic core 25 is inserted into the hollow portion of the bobbin 24, and the magnetic core 25 is inserted into the hollow portion of the bobbin 24. It is a configuration that enables movement. The first solenoid coil 13 and the second solenoid coil 14 are connected in series, and the other end of the first coil 10 is connected to the midpoint. The operation of the current control section 12 will be described.
In each of the solenoid coils, the self-inductance is low when the magnetic core 25 is off, but the self-inductance increases when the magnetic core 25 approaches. Therefore, when the magnetic core 25 is provided on the first solenoid coil 13 side, the self-inductance of the first solenoid coil 13 is increased, and the self-inductance is reduced because the magnetic core 25 is separated from the other second solenoid coil 14. This difference in self-inductance makes it easier for current to flow through the second solenoid coil 14 having low self-inductance. In addition, bobbin 2
The horizontal deflection current flowing through the first solenoid coil 13 and the second solenoid coil 14 can be finely adjusted by moving the magnetic core 25 in the hollow portion at a small interval. The horizontal deflection current flowing through the current controller 12 is
It flows to the drive unit 17. FIG. 5 shows the configuration of the driving unit 17.
In the figure, reference numeral 26 denotes a U-shaped magnetic body, a U-shaped magnetic body 26 is disposed relative to each other, and the first subcoil 18, the second subcoil 19, the third subcoil 20, and the fourth subcoil 21 are provided on the magnetic legs of the U-shaped magnetic body 26. Each is wound. Drive unit 1
FIG. 6 shows the wiring of each of the sub-coils 7. The first subcoil 18 and the third subcoil 20 are wound in the same direction,
The magnetic poles formed on the magnetic legs of the U-shaped magnetic body 26 are wired such that an N pole is generated on the upper left side of the drawing, an S pole is formed on the lower left of the drawing, an S pole is formed on the upper right of the drawing, and an N pole is formed on the lower right of the drawing. Sub coil 19
And the fourth sub-coil 21 are wound in the same direction, and the magnetic poles formed as the magnetic legs of the U-shaped magnetic body 26 are the S pole on the upper left of the drawing, the N pole on the lower left of the drawing, the N pole on the upper right of the drawing, and the lower right on the right of the drawing. Are wired so that an S pole is generated. Further, the other end of the first solenoid coil 13 and one end of the first sub coil 18 are connected in series, and the other end of the second solenoid coil 14 and one end of the second sub coil 19 are connected in series. Similarly, the third solenoid coil 15
And the other end of the third sub coil 20 are connected in series, and the other end of the fourth solenoid coil 16 and one end of the fourth sub coil 21 are connected in series. The other ends of the sub-coils are connected to each other. With such a connection, the horizontal deflection current is supplied to the first sub-coil 18 and the third sub-coil 20 by the driving section 17.
The magnetic poles function to cause the red line of the electron beam on the television screen to move to the right and the blue line to the left. The second subcoil 19 and the fourth subcoil 22 cause the red line of the electron beam to move to the left. , And serves to move the blue line to the right. Hereinafter, the solution of the misconvergence in the electron beam apparatus of the present invention will be described with reference to FIG. In the screen of FIG. 7, the red line 1 is on the left and the blue line 2 is on the right in the left half of the screen. Therefore, the left half of the screen is operated while the flat deflection current is positive,
By positioning the magnetic core 25 on the fourth solenoid coil 16 side so that a current flows through the second coil 11 of the current rectification unit 9 and a current flows through the third solenoid coil 15 of the current control unit 12, The red line 1 is moved rightward and the blue line 2 is moved leftward by the action of the 20 magnetic poles. Next, in the right half of the screen, the red line 1 is on the left side.
Since the blue line 2 is on the right side, the right half of the screen is operated in a state where the horizontal deflection current is negative, the current flows to the first coil 10 of the current rectifier 9, and the current flows to the first solenoid coil 13 of the current controller 12. The red line 1 is moved rightward and the blue line 2 is moved leftward by the action of the magnetic pole of the first sub-coil 18 by positioning the magnetic core 25 on the second solenoid coil 14 side so that the magnetic flux flows. As described above, according to the present invention, the second coil of the current rectifying unit and the screen are set so that the left half of the screen is in the positive state of the horizontal deflection current with respect to misconvergence of the left and right screens of the television screen. In the right half, the first coil of the current rectifying unit is operated in the negative state of the horizontal deflection current, and each of the current control units is controlled according to the state of the color shift of the red line or the blue line of each electron beam on the left and right sides of the screen. The horizontal deflection current flowing through the solenoid coil is adjusted by the magnetic core inserted into the hollow part of the bobbin,
The magnetic field generated from the sub-coil of the driving section can reduce the misconvergence in the horizontal direction.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a wiring diagram of an electron beam deflector according to an embodiment of the present invention. FIG. 2 is an external view showing a configuration of a current rectifier in the embodiment. FIG. 3 is a current rectifier in the embodiment. FIG. 4 is an external view showing a configuration of a current control unit in the embodiment. FIG. 5 is an external view showing a configuration of a drive unit in the embodiment. FIG. 6 is an external view showing wiring of a drive unit in the embodiment. FIG. 7 is a view of a screen of a conventional television. FIG. 8 is a front view of a horizontal deflection coil of a conventional deflection yoke. FIG. 9 is a front view of a horizontal deflection coil of a conventional deflection yoke. FIG. 11 is a diagram of a conventional television screen. FIG. 11 is a diagram of a conventional television screen. [Description of References] 8 Horizontal deflection coil 9 Current rectifier 10 First coil 11 Second coil 12 Current controller 13 First Solenoid coil 14 Second solenoid coil Le 15 third solenoid coil 16 fourth solenoid coil 17 driving unit 18 first sub coil 19 second sub-coil 20 third sub-coil 21 fourth sub-coil 22 magnet 23 U-shaped magnetic body 24 bobbins

Claims (1)

(57) [Claim 1] An electron beam deflecting unit including a current rectifying unit for dividing a horizontal deflection current of a horizontal deflection coil, a current control unit for controlling the divided horizontal deflection current, and a driving unit. An apparatus, wherein the current rectifying unit includes a U-shaped magnetic body and a magnet, and a first coil and a second coil wired to generate magnetic flux in opposite directions on magnetic legs of the U-shaped magnetic body. The horizontal deflection coil is connected to a middle point where the first coil and the second coil are inserted in series and the first coil and the second coil are connected in series. In each case, a magnetic flux is generated in the opposite direction, the inductance is controlled for each half wave by the sum of the magnetic flux generated by the magnet and the magnetic flux generated in the opposite direction, and the horizontal deflection current is divided. One solenoid coil and second solenoid A first bobbin wound around each end of a solenoid coil, and a second bobbin wound around each end of a third solenoid coil and a fourth solenoid coil, each of which is connected to a midpoint where the first solenoid coil and the second solenoid coil are connected. While connecting the first coil, the second coil is connected to the midpoint where the third solenoid coil and the fourth solenoid coil are connected, and a magnetic core is provided in the hollow portion of each bobbin to move the position of the magnetic core. By doing so, the current flowing between the first solenoid coil and the second solenoid coil and between the third solenoid coil and the fourth solenoid coil are respectively adjusted, and the driving unit controls the left and right red colors displayed on the screen of the CRT. Two U-shaped magnetic bodies disposed opposite to each other on the left and right sides of the screen to correct the deviation of the line and the blue line, and the U-shaped magnetic bodies For each of the respective magnetic legs are composed of a first sub-coil and the third sub-coil which is wound in a first direction, the second sub-coil and the fourth sub-coil which is wound in a second direction, said first When the horizontal deflection current flowing through one coil flows, the magnetic poles generated by the first sub-coil and the third sub-coil are N pole on the left upper side, S pole on the lower left side, S pole on the right side, right side when viewed from the screen of the CRT. The magnetic poles generated by the second sub-coil and the fourth sub-coil when the horizontal deflection current flowing through the second coil flows are S poles on the upper left, N poles on the lower left, and upper right on the lower side. Is the N pole, the lower right is the S pole, and the other end of the first solenoid coil, the first sub coil, the other end of the second solenoid coil, the second sub coil, the other end of the third solenoid coil, Said Three sub-coils, the electron beam deflection device and the other end to the fourth sub-coil of the fourth solenoid coils are connected in series.