JPS587969Y2 - Deflection yoke for in-line picture tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a deflection yoke that is attached to a color television receiver, particularly to an in-line picture tube in which a plurality of electron guns are arranged in-line.

Recently, as a deflection yoke mounted on an in-line picture tube, the amount of the deflection magnetic field generated by the deflection yoke applied to each electron beam emitted from the red R, green G, and blue B electron guns has been developed. A so-called self-convergence type deflection yoke that can be adjusted to obtain good convergence without using a convergence yoke is being developed.

However, in the above-mentioned deflection yoke, when using a deflection yoke that produces a uniform deflection magnetic field, the sensitivity of the raster generated by the central green electron gun 3 is lower than that of the red and blue electron guns 2 on both sides, as shown in FIG. , 4, the raster sensitivity is insufficient, resulting in misconvergence.

Therefore, conventionally, as shown in FIG. 3, a magnetic field focusing part 5 is provided in the neck part 1 of the picture tube to increase the raster sensitivity of the central electron gun 3, and the raster sensitivity of the electron guns 2 and 4 on both sides is provided. A cylindrical magnetic piece 6 is provided corresponding to each electron gun 3, 2.4 to increase the raster sensitivity of the central electron gun 3, while at the same time increasing the raster sensitivity of the electron guns 2, 4 on both sides. As shown in FIG. 4, three-beam convergence was performed by lowering the beam.

However, in the above configuration, when the picture tube neck diameter is small, it is structurally difficult to incorporate the magnetic field converging part 5 and the magnetic piece 6 into the neck part, and the number of parts increases.
This increases the cost, and furthermore, since the magnetic field convergence part 5 and the magnetic piece 6 are installed in the neck in advance, it is not possible to make fine adjustments to increase or decrease the amount of the magnetic field, resulting in a lack of applicability.

The present invention aims to solve these conventional drawbacks and to provide a self-convergence type deflection yoke for an in-line picture tube.

Next, embodiments of the present invention will be described using the drawings.

In FIG. 5, 7 is a deflection yoke, which includes a core 8 made of magnetic material, a vertical deflection coil 9 wound directly around the outer circumference of the core 8 in a toroidal shape, and a bobbin 10 mounted on the inner surface of the core 8.
It consists of a horizontal deflection coil 11 wound in a saddle shape through the bobbin 10, and the blue gun B, green gun G, and red gun R are Three electron guns 2, 3.4 are mounted and fixed on a picture tube 14 arranged in-line.

The bobbin 10 of the deflection yoke 7 is made of an insulating material, and includes a bobbin body 19 and a flange-shaped front enlarged opening protruding perpendicularly to the tube axis direction of the bobbin body 19 disposed at the front of the bobbin body 19. The section 18 and the rear part of the bobbin body 19 are provided to protrude perpendicularly to the tube axis direction of the bobbin body 19, and a pair of substantially semicircular magnetic pieces 17A and 17B are sandwiched between the inner wall 22 and the inner wall 23. A magnetic piece storage part 21 having an annular groove for fixing, and an annular part protruding perpendicularly to the tube axis direction of the bobbin body 19 behind the magnetic piece storage part 21 and storing the rear wave line 15 of the horizontal deflection coil 11 therein. It is composed of a rear wire storage section 16 having a cavity, and a rear end 20 having a plurality of tongues disposed at the rear of the rear wire storage section 16.

Further, a magnetic piece storage section is provided on the bobbin 10 between a rear wire making storage section 16 that stores the rear wavy wire 15 of the horizontal deflection coil 11 arranged on the rear part of the bobbin 10 of the deflection yoke 7 and the vertical deflection coil 90. A pair of approximately semicircular magnetic pieces 17A and 17B housed in the interior of the deflection yoke 21 are made of a magnetic material such as permalloy or ferrite, and as shown in FIG. It vertically faces the electron guns 2 and 4 on each side.

In this way, by arranging the pair of substantially semicircular magnetic pieces 17A and 17B with a gap between them facing the electron guns on each side, the electron beam from the central electron gun 3 is The vertical deflection magnetic field amount for the magnetic pieces 17A, 17
Since the leakage magnetic flux is large in the gap part B, it increases in the part A, and the amount of magnetic field for the electron beam from the electron guns 2 and 4 on both sides is cut by the magnetic pieces 17A and 17B and decreases. Increases the raster sensitivity and decreases the raster sensitivity of both side electron beams.

Similarly, regarding the horizontal deflection magnetic field shown in FIG. Since the magnetic fields for the electron beams of the electron guns 2 and 4 are cut, the sensitivity decreases, and as a result, as shown in FIG.

The convergence of B is the one that results in the best condition.

Incidentally, when using the magnetic piece based on this example, the vertical center beam raster shift can be corrected by about 1.5 m/m with a 6-inch color picture tube, and the horizontal deflection sensitivity can be increased by about 5%. It was done.

Furthermore, in the deflection yoke according to the present invention, as shown in FIG. 10, since the magnetic pieces 17A and 17B are arranged in front of the rear wave line 15 of the horizontal deflection coil 11, as shown in FIG.
A magnetic piece 1 is attached to the rear side of the rear wavy line 15 of the horizontal deflection coil 11.
Compared to the configuration in which 7 A and 17 B are arranged, the magnetic field lines 24 of the horizontal deflection magnetic field are not cut due to the influence of the magnetic piece in the C part (behind the rear wavy line 15), and the effective magnetic field range is not narrowed. , without reducing the horizontal deflection sensitivity.

Here, the ends of the magnetic pieces 17A and 17B are formed in a curved shape except for the tip end 25 forming a gap in order to prevent the generation of leakage magnetic flux.

As described above, according to the in-line type picture tube deflection yoke of the present invention, the rear end of the deflection yoke, which is mounted on the picture tube in which a plurality of electron guns are arranged in-line, is located in front of the rear wavy line of the horizontal deflection coil. A pair of substantially semicircular magnetic pieces are fixed via a gap on the bobbin between the rear part of the electron gun and the rear part of the vertical deflection coil, facing each side of the electron gun.
The vertical deflection magnetic field for the central electron beam increases due to the large leakage flux in the gap between the magnetic strips, resulting in an increase in the raster sensitivity of the central electron beam, and the horizontal deflection magnetic field also increases. This increases the sensitivity of the raster of the central electron beam, which eliminates the lack of raster sensitivity caused by the central electron beam in the deflection yoke that creates a uniform deflection magnetic field. Good convergence characteristics can always be obtained.

In addition, it eliminates the need to incorporate magnetic field adjustment parts into the neck of the color picture tube, which reduces the number of parts, simplifies the configuration, and reduces costs.Also, it is possible to design a color picture tube with a narrow neck diameter. Therefore, it is possible to adjust and finely adjust the amount of magnetic field for each deflection yoke, and is highly applicable.

Furthermore, by arranging the magnetic piece in front of the wave line at the rear of the horizontal deflection coil, the deflection sensitivity can be maintained at a good level without reducing the amount of horizontal deflection magnetic field applied to the picture tube (without narrowing the effective magnetic field range). , it is possible to obtain optimal convergence characteristics.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of the electron gun section of an in-line picture tube, Fig. 2 is a raster illustration, Fig. 3 is a schematic diagram of the electron gun section for storage, and Fig. 4 is a raster illustration. FIG. 5 is a partial cross-sectional side view of a deflection yoke according to an embodiment of the present invention, FIG. 6 is a rear view thereof, and FIG. 7 is a horizontal deflection magnetic field with a magnetic piece provided in an embodiment of the present invention. FIG. 8 is an explanatory diagram for the vertical deflection magnetic field, FIG. 9 is an explanatory diagram of the raster operation according to the present invention, FIG. 10 is an arrangement diagram of the horizontal deflection coil and magnetic piece according to the present invention, and FIG.
The figure shows the arrangement of the horizontal deflection coil and magnetic piece in a state where the deflection magnetic field from the horizontal deflection coil is cut. 7: Deflection yoke, 9: Vertical deflection coil, 10: Bobbin,
11: Horizontal deflection coil, 14: Picture tube, 15: Horizontal deflection coil rear connecting wire, 17 A, 17 B: Magnetic piece.

Claims (1)

[Scope of utility model registration request] At the rear end of the deflection yoke mounted on the picture tube in which a plurality of electron guns are arranged in-line, the deflection 1. A deflection yoke for an in-line picture tube, characterized in that a pair of substantially semicircular magnetic pieces are fixed with a gap therebetween, facing each side of the electron gun perpendicularly to the tube axis direction of the yoke.