JPH0223970B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a deflection yoke device mounted on an in-line color picture tube.

Generally, in a self-convergence type deflection yoke mounted on an in-line color picture tube, the vertical deflection magnetic field distribution generated by the vertical deflection coil is distributed over the entire deflection yoke as shown by solid line A in Figure 1. It is known that by adopting a barrel shape, astigmatism of the vertical deflection magnetic field can be minimized and an increase in side pink friction distortion can be suppressed.

In this case, the vertical deflection magnetic field distribution is also barrel-shaped on the front side of the deflection yoke (on the screen side), and side pink tension distortion remains on the screen. In order to achieve this, it is necessary to make the vertical deflection magnetic field distribution at the front part of the deflection yoke uniform, as shown by the broken line B in FIG. 1 (more likely to be pinned than the solid line A).

Recently, as an auxiliary means to correct the side pink distortion that occurs on the screen, a magnetic field receiver is installed at the front of the deflection yoke to receive the leakage magnetic field from the vertical deflection coil, and the magnetic field received by the magnetic field receiver is used to correct the distortion. A side pinless type in which the vertical deflection magnetic field distribution in the front part of the deflection yoke is made uniform by providing an arm-shaped magnetic field correction means made of a magnetic material such as a silicon steel plate, which consists of a magnetic field forming part that forms a magnetic field. A deflection yoke device has been developed and is being put into practical use.

However, in the side pinless type deflection yoke device equipped with the above-mentioned arm-shaped magnetic field correction means, the side pink tension distortion on the screen is corrected, but as shown in FIG. On the other hand, it is affected by the oxidized magnetism E that appears in the hysteresis characteristic caused by the material (silicon steel plate) of the magnetic field correction means C. The residual magnetism E in the magnetic field correction means C is not uniformly distributed on the
As shown in the figure, it is strongest at the center O of the deflection yoke,
It has a distribution that gradually decreases (becomes weaker) toward both sides. Therefore, as shown in FIG.
When deflected in this direction, the blue beam B is more influenced by the residual magnetism E than the red beam R, while
Conversely, when deflected in one X direction, red beam R is affected more than blue beam B.
In the vertical direction of the horizontal position on the X-axis of the screen, as shown in Figure 2, the blue beam B misconverges with the red beam R in the counterclockwise direction (in the direction of arrow F in the figure), resulting in good image quality characteristics on the screen. It was impossible to obtain it in its entirety.

The present invention relates to a deflection yoke device made in view of the above-mentioned matters, and in particular, in order to correct misconvergence that occurs in the vertical direction of the left and right positions on the Y axis of the screen, a pair of horizontal deflection coils are wound in a saddle shape. The present invention relates to a side pinless type deflection yoke device in which an auxiliary coil in which both horizontal deflection coils have different inductance values is connected to at least one side.

Hereinafter, one embodiment of the present invention will be described in detail using the drawings. In FIGS. 4 and 5, 11 is a deflection yoke body, which has a pair of horizontal deflection coils 12a, 12b wound in a saddle shape, and horizontal deflection coils 12a, 12b arranged vertically symmetrically with respect to the tube axis. The coil bobbin 13 is arranged on the inner surface of the coil bobbin 13.
It is composed of an annular core 14 disposed on the outer surface of the coil bobbin 13, and a vertical deflection coil 15 wound toroidally around the core 14. By reducing the diameter through a fixing device 17 such as a band, the blue gun 18, green gun 19, red gun 2
Three electron guns 0 are mounted and fixed on a cathode ray tube 21 arranged in-line in a horizontal direction with respect to the tube axis. A core 14 is provided on the front side of the deflection yoke main body 11 (on the screen 21a side of the cathode ray tube 21).
and close to the vertical deflection coil 15, the vertical deflection magnetic field distribution on the front side of the deflection yoke body 11 is made uniform (pin tendency) as shown by the broken line B in FIG.
As an auxiliary means for correcting the side pink tension distortion caused by the vertical deflection magnetic field, a pair of arm-shaped magnetic field correction means 22 made of a magnetic material such as a silicon steel plate is attached to the front enlarged portion 13a of the coil bobbin 13.
Fixed via. The magnetic field correction means 22 includes a substantially semicircular arc-shaped magnetic field receiving portion 2 that receives the leakage magnetic field of the vertical deflection magnetic field generated by the vertical deflection coil 15.
2a, and arm-shaped magnetic field forming parts 22b that are located at both ends of the magnetic field receiving part 22a, extend toward the screen 21a of the cathode ray tube 21, and form a pin-shaped correction magnetic field by the magnetic field received by the magnetic field receiving part 22a. , are located on the left and right sides of the tube axis and are fixed facing each other. On the other hand, the deflection yoke main body 11
rear side (neck part 21b side of cathode ray tube 21)
Rear enlarged portion 13b of coil bobbin 13 located at
An auxiliary coil 23 is attached and fixed to. As shown in FIG. 6, the auxiliary coil 23 has a movable core 23a.
and a pair of coils 23b and 23c wound in parallel around the outer periphery of a movable core 23a, forming a differential coil.As shown in FIG. 7, at the connection point of horizontal deflection coils 12a and 12b, A coil 23b is connected in series to the horizontal deflection coil 12a, and a coil 23c is connected in series to the horizontal deflection coil 12b. By moving the movable core 23a of the auxiliary coil 23, the coil 2
By changing the inductance values of 3b and 23c,
Finally, the inductance values of the horizontal deflection coils 12a and 12b are made different from each other.
Here, by using a differential coil as the auxiliary coil 23, the pair of horizontal deflection coils 12a, 1
At the same time, unnecessary variations in inductance values that occur when winding wire 2b are absorbed.

In the deflection yoke device having such a configuration, the deflection yoke main body 11 is mounted and fixed at an optimal position on the cathode ray tube 21 with the magnetic field correction means 22 and the auxiliary coil 23 fixed to predetermined positions of the deflection yoke main body 11. After that, the movable core 23d constituting the auxiliary coil 23 fixed to the deflection yoke main body 11 was connected to the horizontal deflection coil 12b located lower with respect to the tube axis among the pair of horizontal deflection coils 12a and 12b. Adjust by moving to the coil 23c side. As the movable core 23a moves, the inductance value of the coil 23c becomes larger than the inductance value on the horizontal deflection coil 12a side. As a result, the current value flowing through the horizontal deflection coil 12a located above the tube axis becomes larger than the current value flowing through the horizontal deflection coil 12b by the amount that the inductance value is small. As shown in FIG. 8, the horizontal deflection magnetic field HB thus generated has an approximately figure-eight shape that expands downward with respect to the center of the tube axis, depending on the amount of current flowing through each deflection coil 12a, 12b. Become. Approximately figure eight-shaped horizontal deflection magnetic field
HB is the main magnetic field vectorwise as shown in Figure 9.
It is decomposed into HBy and sub-magnetic field HBx. Of these, the sub-magnetic field HBx deflects the beam in the vertical direction, and this sub-magnetic field HBx gradually increases toward the left and right positions on the X-axis with respect to the center of the tube axis. As a result, on the left side of the screen, the submagnetic field for blue beam B is larger than the submagnetic field for red beam R, while on the right side of the screen, the submagnetic field for red beam R is larger than the submagnetic field for blue beam B. As a result, as shown in Fig. 10, the misconvergence in the counterclockwise direction between the blue beam B and the red beam R in the vertical direction of the left and right positions on the X-axis of the screen is corrected, and there is no side pink distortion or misconvergence. It is possible to obtain excellent image quality characteristics across the entire screen.

In one embodiment of the deflection yoke device of the present invention, a differential coil consisting of a movable core and a pair of coils is used as an auxiliary coil connected to a horizontal deflection coil, but as shown in FIG. , a normal coil wound in advance to produce predetermined electrical characteristics is connected in series as an auxiliary coil 23 only to the horizontal deflection coil 12b located below the tube axis, and the horizontal deflection coil 12a
It is also possible to configure the auxiliary coil so that the inductance values are different between the side and the 12b side, and the configuration of the auxiliary coil is not limited to the embodiments as long as the inductance values of the upper and lower horizontal deflection coils are different from each other. It is not limited. Furthermore, in one embodiment of the present invention, a case has been described in which the auxiliary coil 23 is attached and fixed to the rear enlarged portion 13b of the coil bobbin 13 that constitutes the deflection yoke main body 11, but the attachment position of the auxiliary coil 23 is different from that in the embodiment. However, when using a differential coil as the auxiliary coil 23, the mounting position should be set appropriately within a range where the leakage magnetic field generated by the differential coil does not affect the main deflection magnetic field. You can also
When using a normal coil as the auxiliary coil 23, it may be attached separately from the horizontal deflection coil to be connected, or it may be attached in a continuous winding configuration around the horizontal deflection coil. It is something.

As described above, the deflection yoke device of the present invention includes a pair of horizontal deflection coils wound in a saddle shape, a coil bobbin with the horizontal deflection coil arranged on the inner surface, and a core arranged on the outer surface of the coil bobbin. and a pair of vertical deflection coils wound toroidally around the core, and a magnetic field receiver placed near the front side of the core and vertical deflection coil to receive the leakage magnetic field, and corrected by the magnetic field received from the magnetic field receiver. In a deflection yoke device that corrects side pink distortion distortion on a screen through a magnetic field correction means that includes a magnetic field forming section that forms a magnetic field, at least one of a pair of horizontal deflection coils has a magnetic field forming section that forms a magnetic field. This is a system in which auxiliary coils with different inductance values are connected, and this is caused by the residual magnetism of the magnetic field correction means installed to correct side pink distortion, which occurs in the left and right positions and vertical directions on the X-axis of the screen. By simply connecting an auxiliary coil to the horizontal deflection coil (by adding a component that deflects the beam in the vertical direction to the horizontal deflection magnetic field generated by the horizontal deflection coil), the misconvergence between the blue beam and the red beam can be reduced. It can be easily corrected with a simple and inexpensive configuration, and it is possible to obtain good image quality characteristics over the entire screen without side pink distortion or misconvergence. In addition, in the deflection yoke device of the present invention, the adjustment range can be widened by changing the number of turns of the auxiliary coil. It can be applied to deflection yoke devices with various configurations, such as non-oscillating and non-convergence type deflection yoke devices that can obtain good convergence characteristics with only a side pinless type deflection device. If applied to a yoke device, the effect will be extremely large.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the vertical deflection magnetic field distribution in a side pinless type deflection yoke device, and Fig. 2 is an illustration of residual magnetism and misconvergence on the front side of a side pinless type deflection yoke device equipped with a magnetic field correction means. A schematic explanatory diagram showing the state of , FIG. 3 is an explanatory diagram also showing the distribution state of residual magnetism on the X axis,
FIG. 4 is a partially sectional side view of a deflection yoke device according to an embodiment of the present invention mounted on a cathode ray tube, FIG. 5 is a front view of the same deflection yoke device, and FIG. Figure 7 is a schematic configuration diagram of the auxiliary coil (differential coil) that is attached, Figure 7 is a connection circuit diagram of the horizontal deflection coil that also shows the connection state of the auxiliary coil, and Figure 8 is a diagram of the horizontal deflection coil with the auxiliary coil connected. FIG. 9 is a partially enlarged explanatory diagram of the horizontal deflection magnetic field thus generated. FIG. 10 is an explanatory diagram of the beam operation in the deflection yoke device of the present invention. FIG. 7 is a horizontal deflection coil connection circuit diagram showing a connection state of an auxiliary coil in another embodiment. 11... Deflection yoke main body, 12a, 12b...
Horizontal deflection coil, 13... Coil bobbin, 14...
... core, 15 ... vertical deflection coil, 22 ... magnetic field correction means, 23 ... auxiliary coil.

Claims (1)

[Claims] 1. A pair of horizontal deflection coils wound in a saddle shape, a coil bobbin with the coils arranged on the inner surface, and a core arranged on the outer surface of the coil bobbin,
It consists of a pair of vertical deflection coils wound toroidally around the core, a magnetic field receiving part arranged near the front side of the core and the vertical deflection coil to receive the leakage magnetic field, and a magnetic field received from the magnetic field receiving part. In a deflection yoke device that corrects side pink tension distortion on a screen through a magnetic field correction means including a magnetic field forming part that forms a correction magnetic field,
At least one of the pair of horizontal deflection coils,
A deflection yoke device characterized in that an auxiliary coil is connected to both horizontal deflection coils having different inductance values.