JPS5829895Y2 - Deflection yoke device - 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.

Recently, in the deflection yoke device installed on an in-line color picture tube, the winding distribution of the horizontal and vertical deflection coils has been changed, or the deflection yoke body has been changed in the entire circumferential direction with respect to the picture tube axis. The deflection magnetic field distribution can be varied in various ways by moving the deflection magnetic field, and the convergence can be adjusted without using a dynamic convergence mechanism.

A so-called convergence-less type is being developed.

In this case, due to the fact that the deflection magnetic field generated by the horizontal deflection coil is a pin (pincushion) magnetic field, and the deflection magnetic field generated by the vertical deflection coil is a balenobarrel (barrel) magnetic field, Regarding three-color electron beams emitted from three-color (blue, green, and red) electron guns arranged in-line, the sensitivity of the deflection magnetic field to the green beam emitted from the central electron gun is As a result, as shown in Figure 1, the green beam G becomes blue at the top and bottom of the picture tube screen. It is known that this causes color shift inward to the B/red beam.

In conventional deflection yoke devices of this type, the central beam (
In order to improve the color shift of the central beam on the screen caused by the low deflection sensitivity to green beam distortion, a magnetic piece is installed near the electron gun exit at the neck of the picture tube, and the distortion caused by horizontal and vertical deflection coils is installed. It was constructed so that a part of the main deflection magnetic field was concentrated to some extent on the central beam (this is called coma aberration).

However, in such a configuration, a magnetic piece is provided directly close to the electron gun in the neck of the picture tube, and a part of the main deflection magnetic field is concentrated on the central beam via the magnetic piece in order to increase the sensitivity. It eliminates the color shift of the beam, and the amount of magnetic field concentrated on the central beam is determined by the strength of the main deflection magnetic field, or
It is determined by the shape and installation position of the magnetic piece.
The amount of magnetic field concentrated (i.e. the increase in sensitivity of the central beam)
is fixed and cannot be adjusted in various ways, and when adjusting convergence by moving the deflection yoke body relative to the picture tube axis, the magnetic piece moves to follow the movement of the deflection yoke body. Therefore, as the deflection yoke body moves, the amount of magnetic field concentrated on the central beam changes, making it difficult to always obtain constant characteristics (amount of magnetic field).
Furthermore, since the magnetic piece is provided close to the electron gun, it has various other drawbacks, such as affecting the focusing characteristics.

The present invention relates to a deflection yoke device aimed at eliminating the above-mentioned drawbacks, and in particular, a pair of U-shaped cores are attached via a holder to the back of the enlarged rear part of a deflection yoke bobbin attached to an in-line picture tube. This invention relates to a deflection yoke device that is movably mounted perpendicular to the arrangement direction of guns and improves color shift of the central beam on the screen.

An embodiment of the present invention will be described in detail below with reference to the drawings.

In Figures 2, 3, and 4, 1 is a deflection yoke body, which includes a core 2 and a bobbin 3 attached to the inner surface of the core 2.
, a horizontal deflection coil 4 wound in a hollow shape on the inner surface of the bobbin 3, and a vertical deflection coil 5 wound in a hollow shape between the inner surface of the core 2 and the outer surface of the bobbin 3, By reducing the diameter of the tightening tongue piece 6 formed on the bobbin 3 through the tightening band 7 and tightening screw 8, blue B and green G
・It is important to fix the three red R color electron guns on the neck of the color picture tube, which is arranged horizontally in-line.

The bobbin 3 of the deflection yoke main body 1 has an enlarged part 3A at the front end (on the picture tube enlarged part side) and the rear end (on the neck part side).
3B, and a holder 9 is fixed to the enlarged rear end portion 3B, covering the back surface of the enlarged portion 3B.

The holder 9 has a hole 9A approximately in the center through which the picture tube neck is inserted, and several locking holes 9K on the side.
By mutually engaging the locking piece 3 formed on the enlarged rear end portion 3B of the bobbin 3 and the locking hole 9K of the holder 9, the fixation of the holder 9 to the enlarged rear end portion 3B of the bobbin 3 is prevented. Ru.

On the inner surface of the holder 9 (the surface facing the rear surface of the enlarged rear end portion 3B of the bobbin 3), a pair of U-shaped cores 10 and 10 are arranged in the direction in which the three color electron guns B, G, and R of the picture tube are arranged. It is mounted movably orthogonally to the

The core 10.10 is held by holding mechanisms 9B, 9B consisting of hook-shaped pressing pieces P, P formed on the inner surface of the holder 9, upright holding walls H, H, etc., and the legs 10A, IOA tips are It is in contact with the surface of the picture tube neck section across the tightening tongue 6 provided on the bobbin 3, and adjusts the vertical movement of the core 10.10 using adjustment holes 9C, 9C formed on the rear surface of the holder 9. It is intimidating.

An auxiliary coil 11.11 connected in series to the vertical deflection coil 5 is connected to the coil bobbin 12.1 on the legs 10A and IOA of the pair of cores 10.10 mounted on the inner surface of the holder 9.
It is wound through 2.

In this case, the auxiliary coil 11.11 (coil bobbin 12.
12) is the core 1 fixed to the inner surface of the holder 9.
0.10 leg 10A, which can be attached to IOA,
This does not in any way impede movement adjustment of the core 10.10.

A terminal T is attached to the outer periphery of the rear end enlarged portion 3B of the bobbin 3 and the outer periphery of the holder 9 via a terminal plate TB, and
The holder 9 is formed with an outlet 9D through which the tightening screw 8 is inserted to the outside.

In a deflection yoke device having such a configuration, a deflection yoke body 1 has horizontal and vertical deflection coils 4 and 5 wound in a saddle shape.
A pair of U-shaped cores 1 are attached to the enlarged rear end portion 3B of the bobbin 3.
0,10, and the holder 9 equipped with the auxiliary coils 11 and 11 is fixed and fixed.

At this time, the core 10.10 mounted on the holder 9 is approximately mounted on the back surface of the enlarged rear end portion 3B of the bobbin 3.

When the holder 9 is fixed to the enlarged rear end portion 3B of the bobbin 3, the deflection yoke main body 1 is mounted on the neck of the picture tube, and the position is adjusted to obtain good convergence characteristics. A tightening tongue piece 6 provided on the enlarged rear end portion 3B is reduced in diameter and fixed onto the neck portion via a tightening band 7 and a tightening screw 8.

After that, an adjustment hole 9C is formed on the rear surface of the holder 9.

9C, insert a pair of U-shaped cores 10.10 into the fifth
As shown in the figure, the direction perpendicular to the arrangement direction of the three color electron guns Blue B, Green G, and Red R (direction of arrow A in the figure)
The deflection sensitivity is increased by adjusting the movement within a range of several mm and applying a magnetic field in the direction of arrow B generated by the core 10.10 to the green beam emitted from the electron gun green G located in the center. .

Here, if you want to significantly increase the deflection sensitivity for the green beam (center beam), use the auxiliary coil 11.1 wound around the legs 10A, 10A of the core 10.10.
While keeping the amount of current flowing through core 10.1 constant,
0 should be moved in the direction of approaching each other, and
If it is not necessary to significantly increase the deflection sensitivity for the green beam, similarly, the cores 10.10 can be moved in the direction away from each other while keeping the amount of current flowing through the auxiliary coil 11.11 constant. Good one, core 10
．． The amount of movement and direction of movement in 10 is the amount of adjustment (degree of increase in sensitivity)
It can be changed as appropriate depending on the situation.

In this way, by applying the magnetic field generated by the pair of cores 10.10 attached to the holder 9 fixedly fixed to the enlarged rear end portion 3B of the bobbin 3 to the green (center) beam, the image shown in FIG. As shown, the top of the picture tube screen,
And, at the bottom, the sensitivity of the green beam increases and is pulled up as shown by the broken line in the figure, resulting in blue and red (
Both sides) are close to the beam, and as a result, the color shift phenomenon of the green beam is eliminated.

Then, when the color shift of the green beam is resolved and adjustment of the movement of the pair of cores 10 and 10 is no longer necessary, the adjustment hole 9C provided in the holder 9 is opened.

An adhesive or the like is injected into the core 9C to secure the core 10, 10 on the inner surface of the holder 9.

In one embodiment of the deflection yoke device of the present invention, the horizontal and vertical deflection coils are both wound in a saddle shape, but the vertical deflection coil may be wound directly around the core in a toroidal shape. is also good.

Further, in one embodiment of the deflection yoke device of the present invention, when fixing the holder to the enlarged rear end portion of the bobbin, a locking piece is provided on the bobbin and a locking hole is provided on the holder, and both are engaged with each other. However, the structure is not limited to the embodiment as long as the holder is fixed to the enlarged rear end portion of the bobbin so as to cover the back surface thereof.

Furthermore, in one embodiment of the present invention, the movement of the pair of U-shaped cores is adjusted using adjustment holes provided in the holder. The cores may be moved, and as long as a pair of cores are moved, the configuration can be changed as appropriate.

As described above, according to the deflection yoke device of the present invention, the holder is engaged and fixed on the back surface of the enlarged rear end portion of the deflection yoke bobbin mounted on the in-line picture tube, covering the back surface of the enlarged rear end portion of the bobbin. A pair of U-shaped cores are mounted movably perpendicular to the arrangement direction of the electron gun through the Compared to the installation position of the horizontal and vertical deflection coils that generate the beam, it is closer to the electron gun in the picture tube, so the magnetic field generated by the pair of cores acts efficiently on the central beam.
There is no risk of deteriorating other factors such as focus characteristics, etc.
This increases the sensitivity of the central beam in an extremely efficient manner.

In addition, a pair of cores are movably attached to a holder, and the amount of magnetic field applied to the central beam is adjusted as appropriate depending on the degree of increase in sensitivity, regardless of the amount of current flowing through the auxiliary coil wound around the core. Since it is adjustable, there is no need for a volume or the like to adjust the amount of current, and good screen characteristics can always be obtained with a simple configuration.

Furthermore, an auxiliary coil wound around a pair of U-shaped cores and core legs is attached to the bobbin via a holder, and the holder protects the core and auxiliary coils. (coil bobbin) is fixed in a holder and only the core is moved.There is no concern that the movement of the core will adversely affect the auxiliary coil, and the movement of the core is smooth and easy to use. Furthermore, as the deflection yoke body moves, the pair of core/auxiliary coils fixed to the back of the enlarged rear end of the bobbin via the hole also moves at the same time. The amount of magnetic field for the central beam does not change in any way with the movement of the deflection yoke body, and has various effects such as always maintaining good characteristics.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the state of color shift of the central beam that occurs on the screen of an in-line picture tube, and Figs. 2 to 4 show an embodiment of the deflection yoke device of the present invention. 3 is a rear view, FIG. 4 is an exploded rear view of the main parts, FIG. FIG. 6 is an explanatory diagram showing how the color shift of the central beam is improved when the deflection yoke device of the present invention is used. 1...Deflection yoke body, 3...Bobbin, 3B...Bobbin rear end enlarged part, 4, 5...
...Horizontal/vertical deflection coil, 10.10...U-shaped core.

Claims (1)

[Claims for Utility Model Registration] A pair of deflection yoke bobbins attached to an in-line picture tube are provided on the back surface of the enlarged rear end portion of the bobbin through a holder that is engaged and fixed to the enlarged rear end portion of the bobbin while covering the back surface thereof. A U-shaped core was mounted so as to be movable perpendicular to the array direction of the electron gun. A deflection yoke device characterized by: