JPS645819Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a deflection yoke mounted on a cathode ray tube, particularly to a deflection yoke applied to a high resolution cathode ray tube.

In recent years, plans have been made to display text information on television receivers, and as video monitors and displays become more widespread, there is a trend toward the use of high-resolution cathode ray tubes. Along with this, a high performance deflection yoke is also required.

By the way, the performance of a deflection yoke depends on the shape of the deflection core and the deflection coil, and it depends on how to minimize manufacturing errors in these. For example, when talking about the deflection coil, in reality, it is due to variations in conductor distribution and deformation due to internal stress. There are some things that cannot be avoided in the manufacturing process. There is also the problem of mutual alignment between the cathode ray tube structure and the deflection yoke. Therefore, misconvergence inevitably occurs in the deflection magnetic field of such a deflection yoke.

Conventionally, measures such as attaching a magnetic piece or a permanent magnet piece to the deflection yoke, wrapping a capture coil around it, and even attaching a dynamic convergence yoke are used, but it is difficult to completely modify the deflection magnetic field. Since this method is not accompanied by convergence, residual convergence may occur. In addition, as in Japanese Utility Model Publication No. 55-29158, there is a structure in which a saddle-shaped deflection coil is divided into two parts to generate a more precise deflection magnetic field, but misconvergence occurs due to variations that occur during the manufacturing process. still occurred.

The present invention provides a deflection yoke that can obtain good convergence by modifying the form of the deflection magnetic field.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 shows an example of a deflection yoke according to the present invention, in which horizontal deflection coils 1 and 2 and vertical deflection coils 3 and 4 are both constructed as saddle-shaped coils. A pair of horizontal deflection coils 1 and 2 are arranged inside a conical coil bobbin 6 that is divided into two parts and molded. This coil has two parts in the middle of the conductor distribution.
It is divided into inner horizontal section windings 11, 21 and outer horizontal section windings 12, 22, and each section winding has lead wires 11a, 11b, 12.
a, 12b, 21a, 21b, 22a, 22b are provided. On the outer surface of the coil bobbin 6, a pair of vertical deflection coils 3 and 4 are arranged as a horizontal deflection coil.
They are arranged at a positional relationship of 90 degrees, and each of them is divided into two in the middle of the conductor distribution to form inner vertical section windings 31 and 4.
1 and outer vertical section windings 32, 42, and from each section winding are lead wires 31a, 31.
b, 32a, 32b, 41a, 41b, 42a,
42b is pulled out. Note that 5 is a cylindrical deflection core.

FIG. 2 shows a wiring diagram of a vertical deflection coil with a low impedance configuration. inner horizontal section winding 11,
21 lead wires 11a and 21b are connected to current differential control means, for example, one end 7a of the differential coil 7,
Lead wires 12a, 22b of outer section windings 12, 22
is connected to the other end 7b of the differential coil. Lead wires 11b, 2 of segmented windings 11, 21, 12, 22
1a, 21b, and 22a are connected to the common line 8. The differential coil 7 has an intermediate tap 7c, and by moving the core 7d, the impedance of the coils 71 and 72 on both sides is changed differentially, and the current flowing through the segmented windings 11 and 21 and the segmented windings 12 and 22 is changed. Vary the amount differentially. The intermediate tap 7c of the differential coil 7 and the common line 8 are connected to a horizontal deflection circuit (not shown).

FIG. 3 shows a wiring diagram of a vertical deflection coil that provides low impedance. The lead wires 31a and 41b of the vertical section windings 31 and 41 are connected to one terminal 9a of a current differential control means, for example, a variable differential resistor 9, and the lead wires 31b and 41a are connected to the common line 10.
Further, the drawn-out ends 32a, 4 of the vertical section windings 32, 42
2b is connected to the other terminal 9b of the differential resistor 9, and the lead lines 32b and 42a are connected to the common line 10.
The mover 9c of the differential resistor 9 and the common line 10 are connected to a vertical deflection circuit (not shown). Therefore, by moving the movable element 9c, the amount of current flowing through the section windings 31, 41 and the section windings 32, 42 can be differentially changed.

In the deflection yoke configured as described above, the differential coil 7
By moving the core 7d of the coil 71 to decrease the impedance of the coil 71 and increase the impedance of the coil 72, more current flows through the horizontal section windings 11 and 21 than the horizontal section windings 12 and 22, so the horizontal deflection magnetic field has a barrel tendency, and conversely, if the impedance of the coil 72 is made small and the coil 71 is made large, the segmented windings 12 and 22 have a barrel tendency.
Since more current than 1,21 flows, the horizontal deflection field can be changed to a pincushion tendency. Therefore,
By adjusting the differential coil, the amount of horizontal misconvergence _XH at both ends of the screen in the horizontal direction X can be adjusted to zero, as shown in FIG. That is, an in-line array of electron beams B,
The raster drawn by the electron beams R and B located on both sides of G and R coincides with the raster drawn by the central electron beam G.

Next, the movable element 9c of the variable differential resistor 9 is connected to the terminal 9.
When moving in the direction a, more current flows through the vertical segment windings 31 and 41 than between the vertical segment windings 32 and 42, and when moving the mover 9c in the opposite direction, the segment windings 31 and 41
The amount of current flowing through the section windings 32 and 41 is smaller than that of the section windings 32 and 42. Therefore, as in the case of a horizontal deflection coil, the form of the vertical deflection magnetic field can be changed, so the amount of horizontal misconvergence _YH at both ends of the screen in the vertical direction Y can be reduced to zero, as shown in Figure 4. It can be adjusted.

In the above embodiment, a low impedance connection of the deflection coil was shown, but as shown in FIGS. 5 and 6, inner section windings 11 and 21 and 31 and
1 are connected in series, the outer section windings 12 and 22 and 32 and 42 are similarly connected in series, and differential currents are caused to flow by the current differential control means 7 and 9. , resulting in a high impedance coil connection.

Further, the vertical deflection coil can be constructed with a toroidal winding, and in this case, the form of the vertical deflection magnetic field cannot be modified, but only _XH can be adjusted.

In the above-mentioned connection, a potential difference occurs between the inner section winding and the outer section winding, so if both section windings are continuously wound, a problem arises in terms of withstand voltage. In this case, a coil bobbin is used in which the inner section winding and the outer section winding are formed separately and a protruding edge is provided between them as described in Japanese Utility Model Publication No. 55-29158.

FIG. 7 shows another embodiment of the deflection coil connection, and describes an example of a horizontal deflection coil.
Inner section winding 11, 21 and outer section winding 12, 2
It is characterized by a connection in which the two adjacent parts have the same potential. . Lead wires 11b and 12 of segmented windings 11 and 12
A differential coil 7 is connected between the section windings 2 and 2.
The lead lines 21b and 22a of No. 1 and No. 22 are connected to the common line 8. The leader wire 11a of the segmented winding 11 is connected to the leader wire 21a of the segmented winding 21, and similarly the leader wire 12b is connected to 22b to form a high impedance series connection. In this connection, coils 1 and 2
The inner section windings 11 and 21 of the outer section winding 12,
This prevents the deflection magnetic fields generated by winding the wire in the opposite direction to 22 from canceling each other out.

Such a deflection coil is made by first rotating the winding machine in the reverse direction to wind the inner segment winding, stopping the rotation and pulling out the intermediate tap, and then rotating the winding machine in the normal direction to wind the outer segment winding. It can be obtained by line. The deflection coil formed in this manner has a continuous conductor distribution similar to the conventional shape, and has the advantage that it is easy to assemble and handle, and the above-described specially structured coil bobbin is not required.

Since the present invention has the above-mentioned configuration, it is possible to adjust the forms of the horizontal deflection magnetic field and the vertical deflection magnetic field individually, and therefore, it is possible to prevent misconvergence caused by the deflection coil that inevitably occurs, especially in the deflection coil. Misconvergence amount due to variation X _H , Y _H
It has the advantage of being able to eliminate As a result, even when characters or the like are displayed on the cathode ray tube, there will be no difficulty in reading them due to color shift.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional configuration diagram of the deflection yoke of the present invention, Fig. 2 is a wiring diagram of the horizontal deflection coil according to the invention, Fig. 3 is a wiring diagram of the vertical deflection circuit according to the invention, and Fig. 4 is a wiring diagram of the vertical deflection circuit according to the invention.
The figure is an explanatory diagram of misconvergence, and FIGS. 5 to 7 are coil connection diagrams of other embodiments. In the figure, 1 and 2 are horizontal deflection coils, 3 and 4 are vertical deflection coils, 5 is a deflection core, 11, 21, 31,
41 is an inner section winding, 12, 22, 32, 42 is an outer section winding, 11a, 11b, 12a, 12
b, 21a, 21b, 22a, 22b, 31a,
32a, 32b, 41a, 41b, 42a, 42
b is a lead wire, 7 is a differential coil, and 9 is a variable differential resistor.

Claims (1)

[Scope of utility model registration request] A deflection yoke comprising a deflection core, a pair of saddle-shaped horizontal deflection coils disposed inside the core, and a pair of vertical deflection coils that generate a vertical deflection magnetic field orthogonal to the horizontal deflection magnetic field generated by the coils. At least the horizontal deflection coil is divided into two parts, each having an inner section winding and an outer section winding, and each section winding is provided with its own lead wire, and the coils of the pair are each provided with a lead wire. The inner section winding and the outer section winding are connected in series or in parallel, and the amount of deflection current flowing through both section windings is differentially changed between the inner section winding and the outer section winding. A deflection yoke characterized in that the deflection yoke is configured by connecting current differential control means.