JP3232565B2 - 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 installed in a cathode ray tube of a television receiver or the like.

2. Description of the Related Art As a misconvergence caused by a deflection yoke, when an electron beam is largely shaken in the horizontal direction, beams at both ends (B, R) of three electron beams arranged in a row.
Are slightly different from each other, and the R line and the B line are shifted at both right and left ends on the screen. In an extreme case, the positions of the R line and the B line are reversed at the left end and the right end as shown in FIG.

This occurs during the manufacturing process of the deflection coil. Generally, in a deflection yoke made by winding a cement wire around a winding coil or winding a cement wire around a winding die, the deflection coil asymmetry due to the unbalance of the winding coil is mainly used. Responsible.

As a countermeasure against this, there are the following methods. In other words, for misconvergence as shown in FIG. 13, at the stage of convergence inspection, as shown in FIG. 14, a wedge 10 is pushed between a pair of insulating frames to deform the deflection coil 11, or As shown in FIG. 15, the magnetic piece 12 was attached to one side of the deflection coil. Also, as shown in FIG. 16, a magnetic piece 13 was attached to the bend-up portion on the electron gun side.

Problems to be Solved by the Invention However, in the above-described method, even if the B line and the R line are aligned in the center as shown in FIG.
In addition, as shown in FIG. 18, problems such as the R line and the B line being shifted up and down in the upper and lower portions were apt to occur, and it was not possible to completely correct the misconvergence. In addition, since the manufacturing process is performed manually, it requires time and human labor, and it is difficult to improve the productivity. In addition, there is a problem that a certain level of skill is required for an operator, and nobody can do it.

The present invention has been made in view of the above problems, and has as its object to provide an electron beam deflecting device that can completely correct misconvergence with minimum human labor and time.

Means for Solving the Problems In order to solve the above problems, the present invention includes a current control unit including a first coil and a second coil whose inductance can be adjusted by moving a magnetic core, and each including a plurality of subcoils. It is composed of a first drive circuit and a second drive circuit,
A sub-coil belonging to the first drive circuit and a sub-coil belonging to the second drive circuit are wound around each magnetic pole portion provided on the magnetic core so as to create magnetic fields in directions opposite to each other. And the current of the sub-coil in the first drive circuit is determined by the inductance of the first coil of the current control unit, and the current of the sub-coil in the second drive circuit is determined by the inductance of the second coil. .

Operation With the configuration described above, when the magnetic core is moved closer to the first coil, the inductance of the first coil increases, and the inductance of the second coil decreases, and the magnetic flux flows to the second drive circuit. As the current increases, the current flowing through the second drive circuit becomes dominant.
Conversely, when the same magnetic core is moved closer to the second coil, the inductance of the first coil decreases, the current flowing in the first drive circuit increases, and the current flowing in the first drive circuit becomes dominant, In contrast to the case described above, the polarity of the magnetic field is reversed, and thus the correction magnetic field can be adjusted only by changing the position of the magnetic core. It is a circuit diagram showing an example. FIG. 2 is an external perspective view of a current control unit of the deflection device, and FIG. 3 is an external perspective view of a correction drive unit of the deflection device. In FIG. 1, reference numeral 1 denotes a horizontal deflection coil. Reference numeral 2 denotes a current control unit of the present deflecting device. The current control unit 2 includes a pair of coils, that is, a coil 2a and a coil 2b. One end of the horizontal deflection coil 1 is connected between the coil 2a and the coil 2b.

Reference numeral 3 denotes a correction drive unit. The correction drive unit 3 is a sub coil 3
a, 3b, 3c, 3d, 3e, 3f, 3g, 3h, sub-coils 3a, 3b are connected in series, and sub-coils 3c, 3d, sub-coils 3e, 3f, and sub-coils 3g, 3h are connected in series, respectively. It is connected. In addition, a series connected body composed of sub-coils 3a and 3b and a series connected body composed of sub-coils 3c and 3d are connected in parallel, and a series connected body composed of sub-coils 3e and 3f and a series connected body composed of sub-coils 3g and 3h are mutually connected. They are connected in parallel. One end of the first drive circuit including the sub-coils 3a, 3b, 3c, and 3d is connected to the coil 2a on the left side of the current control unit 2, and one end of the second drive circuit including the sub-coils 3e, 3f, 3g, and 3h is controlled by the current control. It is connected to the coil 2b on the right side of the section 2. Therefore, the current flowing in the first drive circuit is the left coil 2a
And the current flowing through the second drive circuit is greatly affected by the inductance of the right coil 2b. As described above, one ends of the first drive circuit and the second drive circuit are connected to the horizontal deflection coil via the current control unit 2, and the other ends of the first drive circuit and the second drive circuit are connected to the horizontal deflection current source 9. Have been.

FIG. 2 shows a current control unit. The current control unit 2 winds an electric wire around the parallel bobbin shown in FIG. 6 as shown in FIG.
It is configured by inserting the screw-type magnetic core 5 shown in FIG. The balance of the flowing current can be adjusted by rotating the magnetic core 5 and changing the position of the magnetic core 5. For example, the eighth
As shown in the figure, when the magnetic core 5 is moved to the left, the inductance of the left coil 2a increases, and this coil 2a
And the current flowing through the coil 2b on the opposite side, that is, the right side coil 2b, increases. When the magnetic core 5 is moved to the right, the current flowing through the left coil 2a increases, and the current flowing through the right coil 2b decreases. Thus, by changing the position of the magnetic core 5, the coil 2a
By adjusting the balance between the current flowing through the coil 2b and the current flowing through the coil 2b, the current flowing through the first drive circuit and the current flowing through the second drive circuit can be adjusted.

This embodiment shows a case of a quadrupole magnetic field. In this case, the correction driving unit 3 is wound around a pair of U-shaped cores 6 and 7 arranged so as to sandwich the neck of the cathode ray tube as shown in FIG. Have been. The sub-coil 3a and the sub-coil 3e of the correction driving unit 3 are wound around the magnetic pole part 6a of the U-shaped core 6 so as to generate magnetic fields in opposite directions, and the sub-coil 3b of the correction driving unit 3 is wound around the magnetic pole part 6b. The sub-coil 3f is wound so as to also generate magnetic fields in mutually opposite directions. The magnetic pole portion 7a of the U-shaped core 7
The sub-coil 3c and the sub-coil 3g of the correction drive unit 3 are wound so as to generate magnetic fields in directions opposite to each other.
The sub-coil 3d and the sub-coil 3h of the correction drive unit 3 are wound so as to generate magnetic fields in directions opposite to each other.

Next, the operation in the case of a quadrupole magnetic field will be described. In this case, as described above, for example, the sub-coil 3a and the sub-coil 3e of the correction drive unit 3 are wound around the same magnetic pole unit 6a so as to generate magnetic fields in mutually opposite directions, and the direction of each current is determined by the sub-coil 3a. The sub-coil 3e is oriented so as to form an S-pole when making an N-pole. Whether the magnetic pole portion 6a is an N pole or an S pole is determined by the sub-coil on the first drive circuit side.
It is determined by the current balance between 3a and the sub coil 3e on the second drive circuit side. The same applies to the other magnetic pole portions, and whether to be the N pole or the S pole is determined by the current balance between the sub-coil on the first drive circuit side and the sub-coil on the second drive circuit side.

When the electron beam is swung to the left, a current in the forward direction, that is, the direction of arrow I flows through the horizontal deflection coil 1 in FIG. 1. At this time, if the inductance of the coil 2b on the right side of the current control unit is small, the first drive is performed. The current flowing in the second drive circuit connected to the coil 2b is larger than the current flowing in the circuit, and thus a magnetic field as shown in FIG. 9 is created,
The convergence pattern is as shown in FIG.

When the electron beam is swung rightward, a current in the negative direction, that is, the direction of arrow J flows through the horizontal deflection coil 1. Also in this case, a large current flows through the second drive circuit, but the direction is opposite to the above-mentioned case, so the magnetic field of the drive unit is as shown in FIG. 11, and the convergence pattern is as shown in FIG. Become like By the way, when the electron beam is swung to the left or to the right, some current flows through the first drive circuit.However, when the inductance of the coil 2a is large, the current is more than the current flowing through the first drive circuit. The current flowing through the second drive circuit connected to 2b is very large, and a magnetic field as shown in FIGS. 9 and 11 is generated.

The above is the case where the inductance of the coil 2a is increased and the inductance of the coil 2b is decreased by moving the magnetic core 5 to the left as shown in FIG. 8. If the inductance of the coil 2b of the current control unit is small as described above, Since the current flowing through the second drive circuit connected to the coil 2b is larger than the current flowing through the first drive circuit, the current flowing through the second drive circuit is dominant. Then, as the magnetic core 5 is moved to the right, the inductance of the coil 2b gradually increases,
At the same time, the inductance of the coil 2a decreases.
When the magnetic core 5 reaches the center, the magnitude relationship is reversed. Further, by moving the magnetic core 5 to the right side, the inductance of the coil 2b becomes much larger than the inductance of the coil 2a. Conversely, the current flowing through the first drive circuit increases, and the current flowing through the first drive circuit becomes dominant.

FIG. 5 shows the case of a six-pole magnetic field. Thus 6
With a polar magnetic field, the emission line of the green beam can be moved.

Effect of the Invention As described above, the present invention provides a current control unit including a first coil and a second coil whose inductance can be adjusted by moving a magnetic core, a first drive circuit including a plurality of sub-coils, and a second control circuit. A sub-coil belonging to the first drive circuit and a sub-coil belonging to the second drive circuit are wound around each magnetic pole portion provided on the magnetic core so as to create magnetic fields in directions opposite to each other, and are horizontally The current from the deflection current source flows, and the current of the sub-coil in the first drive circuit is determined by the inductance of the first coil of the current control unit, and the current of the sub-coil in the second drive circuit is determined by the inductance of the second coil. When the magnetic core is moved closer to the first coil, for example, the current flowing through the second drive circuit is When the magnetic core moves closer to the second coil, the current flowing through the first drive circuit increases, and the current flowing through the first drive circuit increases. Current becomes dominant, and the polarity of the magnetic field is inverted with respect to the case described above.
Even if misconvergence occurs such that the line and the B line are greatly displaced, the electron beam can be accurately deflected by the direction and amount of the deviation without touching the horizontal deflection coil, There are very few cases where correction cannot be made at the upper and lower portions of the screen as in the related art. In this way, by simply changing the position of the magnetic core, misconvergence can be corrected almost completely over almost the entire area of the screen, and the work time can be reduced with very little human labor. However, even small workers can easily do this.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of the electron beam deflecting device of the present invention, FIG. 2 is an external perspective view of a current control unit of the deflecting device, and FIG. 3 is an external perspective view of a correction driving unit of the deflecting device. FIG. 4 is an explanatory view showing the operation of the correction drive unit. FIG. 5 is an external perspective view of the correction drive unit in the case of a six-pole magnetic field. FIG. 6 is a bobbin used for a current control unit of the deflection device. 7, FIG. 7 is an external perspective view of a magnetic core used in a current control unit of the deflection device, FIG. 8 is a perspective view showing the configuration of the current control unit, and FIG. 9 is an operation in the same deflection direction. FIG. 10 is an explanatory diagram showing a state on a screen when correction is performed by the deflecting device. FIG. 11 is an explanatory diagram showing the operation of the deflecting device.
FIG. 12 is an explanatory view showing a state on a screen when correction is performed by the deflecting device, FIG. 13 is an explanatory view showing a state of misconvergence of a conventional electron beam deflecting apparatus, and FIG. 14 is a conventional misconvergence correction Explanatory diagram showing an example of the method,
15 and 16 are explanatory views showing another example of the conventional misconvergence correction method, FIG. 17 is an explanatory view showing the state of misconvergence of the electron beam deflector, and FIG. 18 is an electron beam deflector. It is explanatory drawing which shows the state of misconvergence. 1: Horizontal deflection, 2: Current control unit 2a, 2b: Coil, 3 correction drive unit 3a-3h: Sub coil 9: Horizontal deflection current source, 4: Parallel bobbin 5: Magnetic core, 8: Through hole 6, 7: Co Shaped core

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-269836 (JP, A) JP-A-64-2242 (JP, A) JP-A-1-157187 (JP, A) JP-A-2- 30042 (JP, A) JP-A 62-107354 (JP, U) JP-A 64-29762 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04N 9/28 H01J 29 / 76

Claims (1)

(57) [Claims] A horizontal deflection coil through which a horizontal deflection current supplied from a horizontal deflection current source flows, a pair of coils including a first coil and a second coil, and a movable adjustment core; A current controller configured to adjust the inductance of the first coil and the second coil so as to complementarily increase and decrease the inductance of the first coil and the second coil by moving a core; a first drive circuit including a plurality of subcoils; and a plurality of subcoils The second drive circuit comprises: a magnetic field that jumps out of each magnetic pole portion when a magnetic field is applied in a certain direction deflects the beams at both ends of each electron beam in the in-line type cathode ray tube so as to approach each other, and in the opposite direction. A magnetic core configured to deflect the electron beams so as to be separated from each other when the electron beams are fielded. And a correction drive unit wound around the magnetic core so that the sub-coils belonging to the first drive circuit and the sub-coils belonging to the second drive circuit create magnetic fields in opposite directions to each other when the magnetic poles flow. The current of the sub-coil in the first drive circuit is determined by the inductance of the first coil of the current control unit, and the current of the sub-coil in the second drive circuit is determined by the inductance of the second coil. An electron beam deflecting device, wherein a current control unit and the correction drive unit are connected.