JPS6028036Y2 - deflection yoke - 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 a self-convergence type deflection yoke mounted on an in-line color picture tube, the vertical deflection magnetic field generated by the vertical deflection coil is divided into a bottle-shaped magnetic field on the front side (screen side) of the deflection yoke, and a bottle-shaped magnetic field on the rear side (neck side) of the deflection yoke. A side pinless type deflection yoke has been developed that corrects side pincushion distortion on the screen without using a distortion correction transformer (correction circuit) by forming a barrel magnetic field at the side part.

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 is attached to the part, which is made of a magnetic material, 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, and the winding distribution of the vertical deflection coil is specially adjusted. There are two types: one that is configured without using a magnetic field correction mechanism, and one that is configured by combining changes in the winding distribution used especially in wide-angle deflection and the installation of a magnetic field correction mechanism.
etc. are known.

However, in such a configuration, although the side pincushion distortion on the screen is corrected, the coil distribution of a pair of horizontal deflection coils that are positioned above and below the core and wound in a saddle shape together with the vertical deflection coil is - Under the influence of residual magnetism that appears in hysteresis characteristics caused by unbalance in the winding position, etc., or the material of the magnetic field correction mechanism (ferromagnetic material such as silicon steel plate), as shown in Figure 1 A and B. ,
In the vertical direction of the left and right position on the X-axis of the screen, blue beam B is counterclockwise with respect to red beam R (arrow E in the figure).
) or clockwise (direction of arrow F in the figure), resulting in a state of misconvergence, making it extremely difficult to obtain good image quality characteristics over the entire screen.

The present invention relates to a deflection yoke developed in view of the above matters, and in particular, a pair of storage sections are formed on the front edge side of the enlarged front part of the coil bobbin, corresponding to the front crossover wires of the horizontal deflection coil. This invention relates to a side pinless type deflection yoke in which a magnetic piece is movably attached in one of the storage sections for correcting misconvergence that occurs in the vertical direction of the left and right positions on the X-axis of the screen.

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, blue beam B becomes red beam due to unbalance in the coil distribution, winding position, etc. of a pair of horizontal deflection coils. Taking as an example a state in which misconvergence occurs in the counterclockwise direction with respect to R (shown in FIG. 1A), this will be explained in detail with reference to the drawings.

In FIGS. 2 and 3, 11 is a deflection yoke main body, and a pair of horizontal deflection coils 12a and 1 are wound in a saddle shape.
2b, a coil pobbin 13 formed by arranging the horizontal deflection coils 12a and 12b on the inner surface in a symmetrical manner vertically with respect to the tube axis; an annular core 14 disposed on the outer surface of the coil pobbin 13; It is composed of a vertical deflection coil 15 that is divided into two parts and wound toroidally, and by reducing the diameter of a tightening tongue piece 16 formed at the rear end of the coil hobbin 13 via a fixing device 17 such as a tightening band. , blue gun 1
Three electron guns, 8, a green gun 19, and a red gun 20, are mounted and fixed on a color picture tube 21 arranged in-line in the horizontal direction with respect to the tube axis.

Horizontal deflection coils 12a, 1 are provided on the front edge side of the front enlarged portion 13a of the coil pobbin 13 constituting the deflection yoke main body 11.
Corresponding to the tops of the front connecting wires 12al and 12bl of 2b, reinforcing pieces 22 are provided so as to cover the vicinity of the tops.
A pair of storage portions 23a are located above and below via 2.

23b is formed.

As shown in FIG. 4, the storage sections 23a and 23b have a storage groove S with a bottom and a cut groove K formed on the front side of the waist.
Even if the storage sections 263a and 23b are configured integrally with the front enlarged portion 13a of the coil pobbin 13, or they are configured separately and attached to the front enlarged portion 13a of the coil pobbin 13 through means such as adhesion.
It may be fixed to

Among the storage portions 23at23b located on the front edge side of the front enlarged portion 13a of the coil pobin 13, the horizontal deflection coil 12b
A magnetic piece 24 made of a ferromagnetic material such as permalloy is attached to the storage section 23b located on the side (lower side) so as to be movable in the vertical direction with respect to the tube axis within the storage groove S. .

In the deflection yoke having such a configuration, the deflection yoke main body 11
is mounted and fixed at an optimal position on the picture tube 21.

After that, among the storage parts 23a and 23b formed on the front edge side of the front end enlarged part 13a of the coil pobbin 13, the storage part 23b located on the horizontal deflection coil 12b side (lower side)
The magnetic piece 24 is stored in the storage groove S, and the magnetic piece 24 is moved and adjusted within the storage groove S toward the center (upward) of the tube axis.

As the magnetic piece 24 moves, the pair of horizontal deflection coils 12a
, 12b, the inductance value of the horizontal deflection coil 12b on the side (lower side) to which the magnetic piece 24 is attached is the same as that of the magnetic piece 2.
4, the inductance value becomes larger than that of the horizontal deflection coil 12a on the other side (upper side).

As a result, the current flowing through the upper horizontal deflection coil 12a is larger than the current flowing through the lower horizontal deflection coil 12b due to the smaller inductance value, which is generated by the horizontal deflection coils 12a and 12b. As shown in FIG. 5, the horizontal deflection magnetic field HB has a substantially V-shape that expands downward with respect to the center of the tube axis, depending on the value of the current flowing through each horizontal deflection coil 12a, 12b.

In other words, the state is the same as when the horizontal deflection coils 12a, 12b are entirely moved and adjusted downward with respect to the tube axis.

The approximately V-shaped horizontal deflection magnetic field HB is as shown in FIG.
It is vectorially decomposed into a main magnetic field HBy and a magnetically resistant field HBx.

Of these, the magnetic field 1-113x deflects the beam in the vertical direction, and this 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, as shown in Figure 6, the magnetic field for blue beam B is larger than the magnetic field for red beam R, while on the right side of the screen, the magnetic field for red beam R is higher than that for blue beam B. As a result, as shown in Figure 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 pincushion distortion is corrected. , it is possible to obtain good image quality characteristics over the entire screen without misconvergence.

In one embodiment of the deflection yoke of the present invention, a deflection yoke with a configuration that does not use a magnetic field correction mechanism has been described, but it can also be applied to a side pinless type deflection yoke in which a magnetic field correction mechanism is provided at the front part of the deflection yoke. The structure of the deflection yoke is not limited to the embodiment.

In addition, in one embodiment of the present invention, taking as an example a deflection yoke in which the blue beam B misconverges with the red beam R in the counterclockwise direction shown in FIG. 1A, a pair of horizontal deflection coils Among these, the one in which the magnetic piece is movably attached to the front side of the horizontal deflection coil located below the tube axis via the storage part has been described.
It goes without saying that 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, as shown in FIG. B.

In this case, the magnetic piece is the horizontal deflection coil (12a in the figure) located above the tube axis among the pair of horizontal deflection coils.
A storage section (indicated by 2 in the figure) is formed corresponding to the front side of the
3a), and the inductance value of the upper horizontal deflection coil 12a to which the magnetic piece approaches becomes larger than the inductance value of the lower horizontal deflection coil 12b. The current value flowing through the horizontal deflection coils is greater than the current value flowing through the upper horizontal deflection coils, and as a result, the horizontal deflection magnetic field changes to Contrary to the diagram, it becomes an inverted 1-shape that spreads upward from the center of the tube axis, and the final result is a clockwise error of Blue Beat T, B, and Red Beam R in the vertical direction of the left and right positions on the X-axis of the screen. Convergence is also corrected.

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 hobbin. In a deflection yoke consisting of a pair of vertical deflection coils wound toroidally around a core, a bottomed storage groove is provided on the edge side of the front expanded section of the coil bobbin, corresponding to each front connecting wire of the horizontal deflection coil. It has the form of a pair of storage sections with It is possible to easily correct counterclockwise or clockwise misconvergence between the blue beam and red beam that occurs in the vertical direction at the top, left, and right positions, and provides good image quality characteristics across the entire screen without side pincushion distortion or misconvergence. This is something that can be obtained over a period of time.

In addition, in the deflection yoke of the present invention, the position of the magnetic piece can be changed in the vertical direction with respect to the center of the tube axis within the storage section provided in the coil bobbin, so that a wide adjustment range can be obtained. Good convergence characteristics can be obtained simply by adjusting the yoke body in the front-rear direction relative to the cathode ray tube axis.
) It can be applied to deflection yokes with no convergence or convergence, so it is very easy to apply to deflection yokes of various configurations, and is highly applicable.In particular, when applied to deflection yokes without side pins, the effect is It is very much a dog.

[Brief explanation of drawings]

1A and 1B are schematic explanatory diagrams showing the state of misconvergence in a side pinless type deflection yoke;
The figure is a partial cross-sectional side view of a deflection yoke mounted on a cathode ray tube according to an embodiment of the present invention, FIG. , Figure 5 is a schematic illustration of the horizontal deflection magnetic field generated by the horizontal deflection coil when the magnetic piece is attached to the front side of the lower horizontal deflection coil, and Figure 6 is the same horizontal deflection on the left side of the screen. An enlarged explanatory view of the magnetic field, and FIG. 7 is an explanatory view of the beam operation in the deflection yoke of the present invention. 11...Deflection yoke body, 12a, 12b...
...Horizontal deflection coil, 13 ... Coil bobbin, 14 ... Core, 15 ... Vertical deflection coil, 23a, 23b ... Storage section, S ...
... Storage groove, 24 ... Magnetic piece.

Claims (1)

[Scope of utility model registration request] A pair of horizontal deflection coils wound in a saddle shape, a coil bobbin with the coils arranged on the inner surface, a core arranged on the outer surface of the coil bobbin, and a pair of vertical deflection coils wound toroidally around the core. In the deflection yoke consisting of a coil, a pair of storage portions each having a bottomed storage groove are formed on the front edge side of the enlarged front portion of the coil bobbin, corresponding to each front connecting wire of the horizontal deflection coil. A deflection yoke characterized in that a magnetic piece is movably attached to either one of the storage parts.