JPH01151135A - Deflecting yoke device - Google Patents

Abstract

PURPOSE:To correct the misconvergence on a screen with a simple structure by providing a pair of bar-shaped magnetic bodies on the rear side of vertical deflecting coil, winding auxiliary coils on the magnetic bodies, and connecting a variable resistor in parallel with the auxiliary coils. CONSTITUTION:A pair of bar-shaped magnetic bodies 19 and 20 are provided on the extended line of the alignment direction of electron guns B, G and R at the back of the back expanded section 17a of a coil bobbin 17 on the rear side of vertical deflecting coils 15 and 16 constituting a deflecting yoke 11. The preset turns of auxiliary coils 21 and 22 are wound on the magnetic bodies 19 and 20. A variable resistor 24 is connected in parallel with the auxiliary coils 21 and 22, the current quantity flowing through the auxiliary coils 21 and 22 is adjusted by changing the resistance value of the resistor 24. The misconvergence on a screen can be thereby corrected with a simple structure without moving and adjusting the deflecting yoke 11.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is applied to a deflection yoke device used in color television receivers, color display devices, etc., in which three electron guns are arranged in-line. .

<Prior Art> As is well known, in a deflection yoke device which is mounted on a color picture tube having three electron guns arranged in-line and deflects the electron beam generated by each electron gun, a horizontal deflection coil is used. is configured to have a pincushion-shaped deflection magnetic field as a whole, and the vertical deflection coil is configured to have a barrel-shaped deflection magnetic field. By configuring the deflection yoke device in this way, the misconvergence can theoretically be maximized, but in reality, the combination of the picture tube and the li-direction joke device
It is difficult to achieve the best misconvergence. For example, as shown in Figure 6, electron guns (red guns,
The electron beams R and B generated from the blue gun cause misconvergence (Yv) in the vertical direction.

Conventionally, in order to eliminate such misconvergence (Yv) and obtain good screen characteristics, as shown in FIG. Three electron guns (R, G
, a pair of E-shaped cores 2 in the same plane as the arrangement direction of B),
3 are arranged with their leg pieces facing each other, and the E-shaped core 2,
An auxiliary means 7 is provided in which auxiliary coils 4 and 5 are wound in series around each connecting portion of 3, and a variable resistor 6 is connected in parallel to the auxiliary coils 4 and 5.
It was designed to supply a vertical deflection current to the In this case, by adjusting the variable resistor 6, the amount of current flowing through the auxiliary coil 4°5 wound around the E-shaped cores 2 and 3 is changed,
As shown in FIG. 8, by changing the strength of the correction magnetic fields (B1 to B4) that act on the beams B and R located on both sides, which are generated from each leg of the E-shaped cores 2 and 3, the beam B , R correction amount (sensitivity) should be adjusted in accordance with the misconvergence. In the case of the misconvergence shown in Fig.
The correction amount (Fl) of beam R is increased, and the correction amount (F2) of beam R is increased.
) to correct misconvergence (Yv).

<Problems to be Solved by the Invention> However, in such a conventional configuration, the deflection yoke device does not have to be adjusted (positioned) to the left or right with respect to the center of the tube axis, and the Misconvergence (Yv) can be corrected (eliminated), but since two E-shaped cores are used as correction means due to the structure, the shape becomes large and costs increase, and each connection part of the E-shaped cores is The auxiliary coil is wound around the auxiliary coil, which increases the amount of auxiliary coil winding, which also increases costs.
Further, there is a problem in that winding the auxiliary coil around the E-shaped core requires time and effort, resulting in poor workability.

The present invention was developed in view of the problems of the prior art, and consists of a pair of rod-shaped magnetic bodies wound with auxiliary coils, which are arranged on an extension line with respect to the arrangement direction of the electron guns, thereby eliminating errors on the screen. It is an object of the present invention to provide a deflection yoke device that can efficiently eliminate convergence (YV).

<Means for Solving the Problems> The present invention has been made to solve the above problems.
In a deflection yoke device mounted on a color picture tube in which a plurality of electron guns are arranged in-line, a pair of rod-shaped magnetic In addition to providing a magnetic body, an auxiliary coil to which a vertical deflection current or a correction current synchronized with the vertical deflection current is supplied to the magnetic body is provided, and a variable resistor is connected in parallel to the auxiliary coil.

<Operation> The value of the variable resistor connected in parallel to the auxiliary coils wound around a pair of rod-shaped magnetic bodies is adjusted to change the amount of vertical deflection current flowing through each auxiliary coil. As a result, the amount of magnetic field (correction magnetic field) generated from the magnetic material is made different for each magnetic material, and the amount of beam correction is adjusted according to the amount of magnetic field applied to the beams (B, r()) located on both sides. , which corrects misconvergence (yv) on the screen.

<Embodiment> Hereinafter, one embodiment of the deflection yoke device of the present invention will be described in detail with reference to the drawings. In FIG. 1, the deflection yoke 11 is
A circular test core 12 formed by joining a pair of semi-circular cores,
A pair of saddle-shaped horizontal deflection coils 13 .
is arranged on the inner surface of the horizontal deflection coils L3, 14 and the vertical deflection coils 15, 16, and each coil 13
．． Coil bobbin 17 defining the position of 14.15.16
It consists of blue and green.

Color picture tube neck part 1 with three red electron guns (B, G, R) arranged in a horizontal line (inline)
It is attached and fixed on 8. Of these, horizontal deflection coil 13
．． The numeral 14 generates a pincushion-shaped horizontal deflection magnetic field, and the vertical deflection coils 15 and 16 generate a barrel-shaped vertical deflection magnetic field, as in the conventional case.

On the rear side of the vertical deflection coils 15 and 16 constituting the deflection yoke 11, and on the rear side of the rear enlarged portion 16-7a of the coil bobbin 17, there is a groove located on an extension line with respect to the arrangement direction of the electron guns (B, G, R). A pair of rod-shaped magnetic bodies 19 and 20 are provided. The magnetic bodies 19 and 20 are made of magnetic materials such as permalloy, ferrite, and silicon steel plates, and are rectangular in shape, with the longitudinal direction aligned with the arrangement direction of the electron gun.
One end of each is arranged and fixed so as to face the electron guns (B, FL) located on both sides of the three electron guns. A predetermined number of auxiliary coils 21.22 are wound around the magnetic body 19.20. The auxiliary coils 21, 22 are connected in series with each other as shown in FIG.
The auxiliary coils 21.22 are connected in series with the vertical deflection coils 15 and 16 connected to the vertical deflection coils 15 and 16, and a vertical deflection current flows through the auxiliary coils 21 and 22, as in the vertical deflection coils 15 and 16. In addition, a variable resistor (differential volume) 24 is connected to the auxiliary coils 21 and 22 in parallel, and by changing the resistance value of the variable resistor 24, the auxiliary coil 21.
1.22 is used to adjust the amount of current flowing through the circuit.

Next, the operating state of the deflection yoke device of the present invention will be explained in the sixth section.
The correction of misconvergence (yv) shown in the figure will be explained as an example. Auxiliary coil 21 wound around magnetic body 19.20 provided on the rear side of vertical deflection coil 15.16
．． 22 are connected in series to the vertical deflection coils 15, 16, respectively, and a sawtooth wave vertical deflection current flows through each auxiliary coil 21, 22 similarly to the vertical deflection coils 15, 1.6. As a sawtooth wave vertical deflection current flows through the auxiliary coils 21 and 22, a magnetic field B1 is generated in the magnetic body 19, as shown in FIG. 3, when looking below the horizontal center of the screen. A magnetic field B2 is generated in the body 2o. Here, the magnetic field B1+B2 is set in the same direction as the vertical deflection magnetic field (indicated by arrow V). Now, make the correction amount (sensitivity) of beam B larger (up) than the correction amount (sensitivity) of beam R.
By adjusting the variable resistor 24, the misconvergence (Yv) shown in FIG. 6 is corrected.
is adjusted so that the amount of current flowing through the auxiliary coil 22 wound around the magnetic body 20 is made larger than the amount of current flowing through the auxiliary coil 21 wound around the magnetic body 19.

That is, the variable resistor 24 is adjusted so that the resistance value on the auxiliary coil 22 side is greater than the resistance value on the auxiliary coil 21 side. When the amount of current flowing through the auxiliary coil 22 becomes larger than the amount of current flowing through the auxiliary coil 21, the magnetic field B2 generated in the magnetic body 20 according to the amount of current becomes the magnetic field B generated in the magnetic body 19.
1, and as a result, the magnetic field (B
2) is greater than the magnetic field applied to the beam R,
The correction amount FB of the beam B becomes larger than the correction amount FR of the beam R based on the amount of magnetic field applied to the beam. (The sensitivity of beam B is greatly increased, and the sensitivity of beam R is slightly increased.) As a result, as shown in Figure 4 (A), beam B moves in the direction of the arrow (downward) at the bottom of the screen. Corrected. On the other hand, on the upper side of the screen, the correction coil 21
．． The vertical deflection current flowing through the magnetic bodies 19 and 22 is in the opposite direction to the lower side of the screen (due to the sawtooth current), and the direction of the magnetic field generated in the magnetic bodies 19 and 20 is also opposite. Therefore, the correction direction of the beams (B, R) on both sides is in the opposite direction (upward) to the lower side of the screen (Fig. 3), and as shown in Fig. 4 (A).
As shown in , at the top of the screen, beam B with a large amount of correction
is corrected in the direction of the arrow (up), and finally, as shown in Figure 4 (B)
As shown in FIG. 2, it is possible to obtain a screen in which the beams B and R on both sides coincide over the entire screen without misconvergence (Yv). At this time, the sensitivity of the beam G located at the center is simultaneously increased by the action of the magnetic fields B1+B2.

In one embodiment of the deflection yoke device of the present invention, an auxiliary coil wound around a magnetic material is connected in series with a vertical deflection coil, and a vertical deflection current is passed through the auxiliary coil to generate a magnetic field. As mentioned above, the auxiliary coil may be connected in parallel to the vertical deflection coil, and
The current flowing through the auxiliary coil is not limited to only the vertical deflection current, but a correction current synchronized with the vertical deflection current may also be passed, and in this case as well, the same effect as in the embodiment (beam movement adjustment) can be obtained. can. Further, in one embodiment of the present invention, a case has been described in which the magnetic material is provided on the rear side of the enlarged rear part of the coil bobbin, but the mounting position of the magnetic material is not limited to the embodiment. It may also be provided on the front surface of the enlarged rear portion of the coil bobbin. Furthermore, the shape of the magnetic piece is not limited to the rectangular shape of the embodiment as long as it is rod-shaped; for example, as shown in FIGS. It is also possible to use a concave T-shaped test, in which case the beams (B, R)
The application of the magnetic field (generated in the magnetic piece) to the magnetic field can be efficiently controlled. Furthermore, in one embodiment of the deflection yoke device of the present invention, misconvergence occurs when the amount of correction for beam B is smaller than the amount of correction for beam R (the sensitivity of beam B is insufficient compared to the sensitivity of the general beam). Although the correction operation has been described, it goes without saying that the present invention can be applied to correction of misconvergence in a state where the amount of correction for beam R is smaller than the amount of correction for beam B. Furthermore, in one embodiment of the present invention, the magnetic field generated in the magnetic material by the current flowing through the auxiliary coil is set in the same direction as the vertical deflection magnetic field, but the connection (winding direction) of the auxiliary coil is reversed to produce the vertical deflection. Even if the configuration is such that a magnetic field opposite to the magnetic field is generated in the magnetic material, there is no change in the operation, and the misconvergence is corrected.

However, in this case, the sensitivity of the center beam is reduced.

<Effects of the Invention> The deflection yoke device of the present invention is as described above in detail, and produces the following effects.

In other words, a pair of rod-shaped magnetic bodies are provided on the rear side of the vertical deflection coil, an auxiliary coil is wound around the magnetic body, and the amount of current flowing through the auxiliary coil is adjusted using a variable resistor, and the deflection yoke is moved and adjusted. Misconvergence on the screen can be corrected with an extremely simple configuration without any problems, and good screen characteristics can always be obtained. Also,
Compared to the conventional Y-shaped station that uses a magnetic body (core), the use of a rod-shaped magnetic body makes it smaller in size and requires less winding of the auxiliary coil, which is advantageous in terms of material and cost. Moreover, the work of winding the auxiliary coil around the magnetic material is extremely simplified, as it can simply be wound around a rod-shaped object.
This significantly improves work efficiency.

[Brief explanation of the drawing]

Fig. 1 is a schematic rear view of an embodiment of the deflection yoke device of the present invention, Fig. 2 is a wiring diagram showing the connection state of the auxiliary coil, and Fig. 3 is a diagram showing eight states of magnetic field generation generated by the magnetic material. Explanatory diagram as seen from the front of the screen, Figure 4 (A)
FIG. 4 (B
5(A) and 5(B) are respectively plan views of magnetic bodies in other embodiments of the deflection yoke device of the present invention, and FIG. 6 is an explanatory diagram of the state in which the beams converge. An explanatory diagram showing the state of misconvergence (Yv), Fig. 7 is a schematic rear view of the conventional deflection yoke device, and Fig. 8 shows the generation of a magnetic field generated by the magnetic material provided in the deflection yoke device shown in Fig. 7. It is an explanatory view seen from the front of the screen showing eight states.

Claims (1)

[Claims] A core, a pair of saddle-shaped horizontal deflection coils and a pair of toroidal or saddle-shaped vertical deflection coils wound along the core, and the horizontal deflection coil and the vertical deflection coil arranged on the inner surface of the core. provide insulation between the
In a deflection yoke device, which comprises a coil bobbin that defines the position of each coil, and is mounted on a color picture tube in which a plurality of electron guns are arranged in-line, the electron gun is mounted on the rear side of the vertical deflection coil. A pair of rod-shaped magnetic bodies are provided on an extension line with respect to the arrangement direction, and
A deflection yoke device characterized in that an auxiliary coil is provided to the magnetic body to which a vertical deflection current or a correction current synchronized with the deflection current is supplied, and a variable resistor is connected in parallel to the auxiliary coil.