JPH0161223B2 - - Google Patents

Description

Detailed Description of the Invention The present invention comprises an in-line color picture tube in which three beam holes are arranged horizontally in a straight line, and a self-convergence type deflection yoke that is attached to the picture tube and provides a deflection magnetic field. The present invention relates to a color picture tube device comprising:

Generally, a self-convergence type deflection yoke is used in the operation of an in-line color picture tube. With such a deflection yoke,
Although a complicated convergence mechanism is not required, since the horizontal deflection magnetic field is distorted in a pink-tension shape and the vertical deflection magnetic field is distorted in a barrel-shape, pink-tension distortion is likely to occur in the raster. Therefore,
The distortion is corrected by superimposing a correction current on the deflection current. Recently, a deflection yoke with a special winding structure is used to distort the horizontal and vertical deflection magnetic field distribution into a strong barrel shape on the electron gun side and a strong pink tension shape on the phosphor film side. The deflection magnetic field as a whole is distorted in a pink-tension shape, and the vertical deflection magnetic field as a whole is distorted in a barrel-shape. In this case, the raster pink-tension distortion can be corrected without superimposing a correction current on the deflection current. can do. However, the influence of deflection aberration due to coma becomes large, and as shown in Figure 1, the green raster G produced by the central electron beam is replaced by the red raster R and blue raster B produced by both electron beams.
It has the disadvantage that it is larger in the horizontal direction and smaller in the vertical direction. The present invention uses such a self-convergence type deflection yoke while changing the size of the green raster G to the red raster R and the blue raster B.
The object of the present invention is to provide a color picture tube device that can be made close to each size of the picture tube device.Next, the color picture tube device of the present invention will be described in detail together with embodiments shown in the drawings.

In FIG. 2, the non-magnetic metal plate 1 provided at the tip of the final accelerating electrode of the in-line electron gun is
A first magnetic piece 5 and a second magnetic piece 6 are attached to a plate surface having a central beam hole 2 and side beam holes 3 and 4. The first magnetic piece 5 stands up in the tube axis direction from the bottom part 5b, which places the vertical side part 5a between the central beam hole 2 and the side beam hole 3, and from the position of the vertical side part 5a closer to the central beam hole. It consists of a rectangular vertical wing section 5c and a pair of rectangular horizontal wing sections 5f and 5g. However, the bottom surface portion 5b has a pair of horizontal side portions 5d and 5e in addition to the vertical side portion 5a. This horizontal side portion 5d,
5e protrudes to the left from two places on the vertical side portion 5a to form a left side area vertically sandwiching the exit of the side beam hole 3, and a left side area that protrudes from two places on the vertical side portion 5a to the right to sandwich the exit of the central beam hole 2. and a right side area that vertically sandwiches a portion thereof. The pair of horizontal wing portions 5f and 5g are arranged between a pair of horizontal side portions 5 to sandwich the vicinity of the exit of the side beam hole 3 in the vertical direction.
They stand up in the tube axis direction from the outer positions of d and 5e and face each other.

Also, like the first magnetic piece 5, the second magnetic piece 6 has a bottom part 6b with a vertical side part 6a between the center beam hole 2 and the side beam hole 4, and a bottom part 6b with a vertical side part 6a. It consists of a rectangular vertical wing section 6c that stands up in the tube axis direction from a position near the central beam hole, and a pair of rectangular vertical wing sections 6f and 6g. However, the bottom surface portion 6b has a pair of horizontal side portions 6d and 6e in addition to the vertical side portion 5a, and the horizontal side portions 6d,
6e protrudes to the right from two places on the vertical side portion 6a to form a right side area vertically sandwiching the exit of the side beam hole 4, and a portion 6e protrudes from two places on the vertical side portion 6a to the left to form the exit of the central beam hole 2. It has a left side area that vertically sandwiches a portion of the left side area. The pair of horizontal wing portions 6f and 6g are arranged in a pair of horizontal side portions 6 in order to sandwich the vicinity of the exit of the side beam hole 4 in the vertical direction.
The first and second magnetic pieces 5, 6 stand up in the tube axis direction from the outer positions of d and 6e and face each other.
The vertical wing portions 5c and 6c are arranged symmetrically so that the vicinity of the exit of the central beam hole 2 is sandwiched in the horizontal direction.

When the horizontal deflection magnetic field from the deflection yoke acts on the first and second magnetic pieces 5 and 6, lines of magnetic force are generated as indicated by broken arrows in FIG. The magnetic flux density distribution of the horizontal deflection magnetic field on the central axis is as shown by curves 2a, 3a, and 4a in FIG. That is, the horizontal deflection magnetic field near the exit of the central beam hole 2 mainly affects the right side areas of the horizontal side portions 5d and 5e of the first magnetic piece 5, the vertical wing portion 5c, and the horizontal side of the second magnetic piece 6. The horizontal deflection magnetic fields near the respective exits of the side beam holes 3 and 4 are weakened by the left regions of the portions 6d and 6e and the vertical wing portion 6c, and conversely, the horizontal deflection magnetic field near the respective exits of the side beam holes 3 and 4 is mainly weakened by the horizontal wing portions 5f, 5g, 6f, and 6g. Twisted and strengthened. Therefore, the electron beams are subjected to a stronger horizontal deflection than the electron beams immediately after exiting the side beam holes 3 and 4, and the red raster R and blue raster B
It is possible to make each horizontal size of the green raster G close to the horizontal size of the green raster G.

Furthermore, when the vertical deflection magnetic field from the deflection yoke acts on the first and second magnetic pieces 5 and 6,
Lines of magnetic force are generated as shown by broken arrows in FIG.
b, 4b. That is, the vertical deflection magnetic field near the exit of the central beam hole 2 is mainly strengthened by the vertical wings 5a, 6a, and conversely, the vertical deflection magnetic field near the exits of the side beam holes 3, 4 is mainly strengthened by the vertical wing parts 5a, 6a. The left side area and the horizontal wing portions 5f, 5g of the horizontal side portions 5d, 5e of the first magnetic material piece 5, and the right side area and the horizontal wing portion 6 of the horizontal side portions 6d, 6e of the second magnetic material piece 6.
It is weakened by f,6g. Therefore, the electron beam immediately after exiting the central beam aperture 2 is subjected to a stronger vertical deflection effect than the two electron beams immediately after exiting the side beam apertures 3 and 4, and the vertical size of the green raster G is changed to the red raster R. and the vertical size of the blue raster B.

The two horizontal wing portions 5f, 5g, 6f, 6g of the first and second magnetic pieces 5, 6 are connected to the vertical wing portion 5.
Since the rasters G, B, and R are separated from each other, all the rasters G, B, and R can be relatively easily made to have the same size by setting their widths and heights to appropriate values. Further, the substantially I-shaped bottom portions 5b and 6b of both magnetic pieces 5 and 6 function to shield the deflection magnetic field from reaching the electron gun side.

The first and second magnetic pieces 5, 6 are, for example,
0.25mm thick iron-nickel alloy (Fe50%, Ni50%)
It can be formed using a plate. In addition, in the case of a 90-degree deflection 14-inch color picture tube, the bottom plate portion 5b,
The vertical length and horizontal length of 6b are approximately 5 mm, and the width and height of vertical wing portions 5c and 6c are approximately 3 mm and 5 mm, respectively.
2.7mm, and horizontal wing parts 5f, 5g, 6f,
The width of 6g can be set to 2.7mm. Also,
The bottom plate portions 5b, 6b can be set in a shape as shown in FIG. 7 or FIG. 8.

The horizontal and vertical deflection magnetic field distributions are distorted into a strong barrel-like shape on the electron gun side and into a strong pink-tension shape on the phosphor film side, and the horizontal deflection magnetic field as a whole is distorted into a pink-tension-like distribution.
As a deflection yoke that distorts the vertical deflection magnetic field as a whole into a barrel-like distribution, the winding angle of the vertical toroidal coil with respect to the ferrite core is made wider on the electron gun side than on the screen surface side, and In addition to the diagonal winding method, which produces a strong distortion with a barrel tendency, the winding angles on the electron gun side and the phosphor film side are narrowed so that the vertical deflection magnetic field distribution has a tendency toward pink tension as a whole. A method that creates barrel distortion by providing a body piece,
The degree of diagonal winding is reduced, arm-shaped magnetic pieces are provided on the phosphor film side, and the vertical deflection magnetic field of the cross-arm method, which uses leakage magnetic flux to strengthen the pink tension tendency on the phosphor film side, is applied to a magnetic barrel shape. There are methods such as none, a method in which magnetic pieces are provided on the electron gun side and the phosphor film side in the core, and a method in which a magnet is used.

As described above, according to the color picture tube device of the present invention, in particular, the vertical side portions located between the central beam hole and the side beam holes are formed on the bottom portions of the first and second magnetic pieces. , 2 of this vertical side part
a pair of horizontal side portions that protrude in one direction from one location and vertically sandwich the exit of the side beam hole, and protrude in the other direction from two of the vertical side portions and vertically sandwich a portion of the exit of the central beam hole; This not only allows the bottom surface portion to almost completely shield the deflection magnetic field from reaching the electron gun side, but also allows the first and second magnetic pieces to be stably supported against the non-magnetic metal plate. be able to. Moreover, the horizontal side portion, together with the vertical side portion and the vertical wing portion, acts to weaken the horizontal deflection magnetic field near the exit of the central beam hole, and
Together with the vertical side portion and the horizontal wing portion, this serves to weaken the vertical deflection magnetic field near the exit of the side beam hole. Therefore, the vertical wing section,
By appropriately selecting the sizes and shapes of the water wing portion and the bottom surface portion, the sizes of the green, red and blue rasters can be made uniform;
A color image with excellent color purity can be projected.

[Brief explanation of drawings]

Fig. 1 is a diagram for explaining the difference in three raster sizes caused by comatic aberration, Fig. 2 is a perspective view of the main part of a color picture tube device embodying the present invention, and Fig. 3 is a horizontal view of the main part. Deflection magnetic field distribution diagram, Figure 4 is a tube axis direction magnetic flux density distribution diagram of the horizontal deflection magnetic field of the same device, Figure 5 is a vertical deflection magnetic field distribution diagram in the same important part, Figure 6 is a tube of the vertical deflection magnetic field of the same device. The axial magnetic flux density distribution diagram, FIGS. 7 and 8 are perspective views of essential parts of other embodiments of the present invention. 1...Nonmagnetic metal plate, 2...Central beam hole,
3, 4...Side beam hole, 5, 6...Magnetic material piece, 5a, 6a...Vertical side portion of bottom plate portion, 5b,
6b... Bottom plate part, 5c, 6c... Vertical wing part, 5
d, 5e, 6d, 6e...horizontal side part of the bottom plate part,
5f, 5g, 6f, 6g...Horizontal wing section.

Claims (1)

[Claims] 1. An in-line color picture tube in which a non-magnetic metal plate provided at the tip of a final accelerating electrode has a central beam hole and a side beam hole and is attached with first and second magnetic pieces; a deflection yoke that provides a horizontal deflection magnetic field that is distorted in a barrel shape as a whole on the gun side, and a vertical deflection magnetic field that is distorted as a barrel shape as a whole, and a vertical deflection magnetic field that is distorted as a barrel shape as a whole on the phosphor film side; Each of the second magnetic pieces includes a bottom portion facing the non-magnetic metal plate, a vertical wing portion, and a pair of horizontal wing portions, and the bottom portion faces the center beam hole and the side beam hole. a vertical side portion located between the vertical side portions, and a vertical side portion that protrudes in one direction from two places on the vertical side portions to sandwich the exit of the side beam hole in the vertical direction, and protrudes in the other direction from two places on the vertical side portions in the center; a pair of horizontal side portions vertically sandwiching a portion of the exit of the beam hole, and the vertical wing portion is configured to horizontally sandwich the vicinity of the exit of the central beam hole with the vertical wing portion of the other magnetic material piece. The vertical side portion stands up from a position close to the central beam hole and protrudes in the tube axis direction, and the pair of horizontal wing portions vertically sandwich the exit portion of the side beam hole.
A color picture tube device characterized in that the pair of horizontal sides stand up in the tube axis direction from positions on the outside and face each other.