JPS6346949B2 - - Google Patents

Description

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

Recently, in self-convergence type deflection yokes installed on in-line color picture tubes, the vertical deflection magnetic field generated by the vertical deflection coil is converted into a pin-shaped magnetic field at the front side (screen side) of the deflection yoke, and a pin-shaped magnetic field at the rear side. By creating a barrel-shaped magnetic field on the side (neck side), distortion correction transformer (correction circuit) is created.
A side pinless type deflection yoke has been developed that corrects side pink distortion distortion on the screen without using a side pin.

As such a deflection yoke, there are two types of deflection yoke, one in which the vertical deflection coil is divided into two around the core and wound toroidally, and the winding distribution is changed at the front and rear ends of the core. An arm-shaped magnetic field correction mechanism consisting of a magnetic field receiving part that receives the vertical deflection magnetic field and a magnetic field forming part that forms an auxiliary magnetic field is attached to the part, and the winding distribution of the vertical deflection coil is made special. There are two known configurations, including one that is configured without using a magnetic field correction mechanism, and one that is configured by combining a change in the winding distribution used particularly for wide-angle deflection and the attachment of a magnetic field correction mechanism.

However, in such a configuration, although the side pink distortion on the screen is corrected, a pair of horizontal deflection coils are positioned above and below the core and wound in a saddle shape together with the vertical deflection coil. As shown in Figure 1A and B, the X of the screen is In the vertical direction of the left and right positions on the axis, the blue beam B misconverges with the red beam R in the counterclockwise direction (direction of arrow E in the figure) or clockwise (direction of arrow F in the figure), resulting in good image quality. It has been extremely difficult to obtain characteristics across the entire screen.

The present invention relates to a deflection yoke made in view of the above matters, and in particular, one of a pair of horizontal deflection coils wound in a saddle shape in order to correct misconvergence that occurs in the vertical direction of the left and right positions on the X-axis of the screen. This invention relates to a side pinless type deflection yoke in which a magnetic piece is attached to the front side of the deflection yoke, and both horizontal deflection coils have different inductance values.

Hereinafter, an embodiment of the present invention will be described in which, in a deflection yoke that does not use a magnetic field correction mechanism, the blue beam B becomes the red beam R due to an imbalance in the coil distribution, winding position, etc. of a pair of horizontal deflection coils. A state in which misconvergence occurs in the counterclockwise direction (as shown in FIG. 1A) will be described in detail with reference to the drawings. In Figures 2 and 3, 1
Reference numeral 1 denotes a deflection yoke body, which has a pair of horizontal deflection coils 12a and 12b wound in a saddle shape, and the horizontal deflection coils 12a and 12b are arranged on the inner surface symmetrically in the vertical direction with respect to the tube axis. It consists of a coil bobbin 13, an annular core 14 arranged on the outer surface of the coil bobbin 13, and a vertical deflection coil 15 divided into two parts and wound toroidally around the core 14, and formed at the rear end of the coil bobbin 13. By reducing the diameter of the tightening tongue piece 16 via a fixing device 17 such as a tightening band, the blue gun 18 and the green gun 1 are
9. Three electron guns, ie, a red gun 20, are mounted and fixed on a color picture tube 21 arranged in-line in a horizontal direction with respect to the tube axis. Deflection yoke body 11
On the front side (on the screen 21a side of the picture tube 21), there is a wire corresponding to the top position of the front crossover wire 12b1 of the lower horizontal deflection coil 12b of the pair of horizontal deflection coils 12a and 12b. A magnetic piece 22 made of a ferromagnetic material such as permalloy is attached. The magnetic piece 22 is attached to the horizontal deflection coils 12a, 1 on the front edge side of the front enlarged portion 13a of the coil bobbin 13.
A pair of upper and lower storage portions 23a, 2 are formed corresponding to the tops of the front crossover wires 12a1, 12b1 of 2b.
3b, the storage portion 23b is located on the side (lower side) of the horizontal deflection coil 12b. As shown in FIG. 4, the storage sections 23a and 23b have a bottomed storage groove S for storing the magnetic piece 22 so as to be movable in the vertical direction with respect to the tube axis, and a cut groove K is formed on the front surface. The storage parts 23a and 23b may be integrated with the front enlarged part 13a of the coil bobbin 13, or they may be constructed separately and attached to the front enlarged part 13a of the coil bobbin 13 through means such as adhesion. It may be fixed to

In the deflection yoke having such a structure, the deflection yoke main body 11 is mounted and fixed at an optimal position on the picture tube 21. After that, the front end enlarged portion 13 of the coil bobbin 13
Among the storage portions 23a and 23b formed on the front edge side of a, the magnetic piece 22 is stored in the storage groove S of the storage portion 23b located on the horizontal deflection coil 12b side. ). As the magnetic piece 22 moves, the inductance value of the horizontal deflection coil 12b on the side (lower side) to which the magnetic piece 22 is attached among the pair of horizontal deflection coils 12a and 12b changes due to the approach of the magnetic piece 22 ( The inductance value of the horizontal deflection coil 12a (upper side) is larger than that of the horizontal deflection coil 12a. As a result, the current value flowing through the upper horizontal deflection coil 12a is reduced by the smaller inductance value.
As shown in FIG. 5, the horizontal deflection magnetic field HB generated by the horizontal deflection coils 12a, 12b is larger than the current value flowing through each horizontal deflection coil 12a, 12b. Correspondingly, it has a substantially V-shape that expands downward with respect to the center of the tube axis. (This is the same state as when the horizontal deflection coils 12a and 12b are adjusted by moving them entirely downward with respect to the tube axis.) A horizontal deflection magnetic field with a substantially V-shaped shape
HB is the main magnetic field vectorwise as shown in Figure 6.
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 drawing, as shown in Figure 6, the submagnetic field for blue beam B becomes larger than the submagnetic field for red beam R, while on the right side of the screen, the submagnetic field for red beam R becomes a submagnetic field for blue beam B. As a result, as shown in Fig. 7, the misconvergence of the blue beam B and the red beam R in the counterclockwise direction in the vertical direction of the left and right positions on the X-axis of the screen is corrected, and the side pink tension is Good image quality characteristics without distortion or misconvergence can be obtained over the entire screen.

In addition, in one embodiment of the deflection yoke of the present invention,
Although we have described a deflection yoke with a configuration that does not use a magnetic field correction mechanism, it may also be applied to a side pinless type deflection yoke in which a magnetic field correction mechanism is provided at the front of the deflection yoke. It is not limited to. In addition, in one embodiment of the present invention, a pair of horizontal deflection yokes are taken as an example of a deflection yoke in which the blue beam B misconverges with the red beam R in the counterclockwise direction as shown in FIG. 1A. Of the coils, we have described one in which a magnetic piece is attached to the front side of the horizontal deflection coil located below the tube axis (the top position of the front crossover wire), but as shown in FIG. 1B, Needless to say, the present invention can also be applied to a deflection yoke in which the blue beam B misconverges clockwise with respect to the red beam R. In this case, the magnetic piece is
Among the pair of horizontal deflection coils, the horizontal deflection coil located above the tube axis (indicated by 12a in the figure)
The inductance value of the upper horizontal deflection coil 12a, where the magnetic pieces are close to each other, is larger than the inductance value of the lower horizontal deflection coil 12b, and the lower horizontal deflection coil 12a is attached to the front side of the The value of the current flowing through the coil is greater than the value of the current flowing through the upper horizontal deflection coil, and as a result, the horizontal deflection magnetic field varies depending on the amount of current flowing through each horizontal deflection coil, as shown in Figure 5. On the contrary, it becomes an inverted V-shape that spreads upward from the center of the tube axis, and the clockwise misconvergence between Blue Beam B and Red Beam R in the vertical direction of the left and right positions on the X-axis of the screen is also corrected. It is something.

As described above, the deflection yoke 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. In a deflection yoke consisting of a pair of vertical deflection coils wound toroidally around a core, a magnetic piece is attached to the front side of one of the horizontal deflection coils, and the inductance values of both horizontal deflection coils are adjusted to each other. The front side of one of the horizontal deflection coils is equipped with magnetic material to prevent misconvergence between the blue beam and the red beam in the counterclockwise or clockwise direction that occurs in the vertical direction of the left and right positions on the X-axis of the screen. By simply attaching the pieces (close together), 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. It is something. In addition, in the deflection yoke of the present invention, the adjustment range can be widened by changing the attachment position of the magnetic piece in the vertical direction with respect to the center of the tube axis. It can be applied to deflection yokes with various configurations, such as non-oscillation and non-convergence type deflection yokes that can obtain good convergence characteristics by simply adjusting the movement in the front and back direction. If applied to a side pinless type deflection yoke, the effect will be extremely large.

[Brief explanation of drawings]

Figures 1A and B are schematic explanatory diagrams showing the state of misconvergence in a side pinless type deflection yoke, and Figure 2 is a partial cross-section of a deflection yoke according to an embodiment of the present invention mounted on a cathode ray tube. FIG. 3 is a front view of the deflection yoke; FIG. 4 is a perspective view of the storage section that stores the magnetic pieces;
Figure 5 is a schematic illustration of the horizontal deflection magnetic field generated by the horizontal deflection coil with the magnetic piece attached to the front side of the lower horizontal deflection coil, and Figure 6 is the same horizontal deflection field on the left side of the screen. An enlarged explanatory diagram of the magnetic field, and FIG. 7 is an explanatory diagram of the beam operation in the deflection yoke of the present invention. DESCRIPTION OF SYMBOLS 11... Deflection yoke main body, 12a, 12b... Horizontal deflection coil, 13... Coil bobbin, 14... Core,
15... Vertical deflection coil, 22... Magnetic piece, 23a,
23b...Storage section.

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,
In a deflection yoke consisting of a pair of vertical deflection coils wound toroidally around the core, a magnetic piece is attached to the front side of one of the horizontal deflection coils, and the inductance value of both horizontal deflection coils is adjusted. A deflection yoke characterized by being different from each other.