JPS6091536A - Color picture tube device - Google Patents

Abstract

PURPOSE:To better correct an orbit near the deflection face by providing the second pair of magnet pieces for generating a multipole magnetic field between the first pair of magnet pieces for generating a multipole magnetic field and the deflection yoke. CONSTITUTION:The first pair of magnet pieces for generating a multipole magnetic field such as quadripole or the like as before is mounted in the position shown by a plane 18 between an electron beam discharge port of a electron gun 17 and a deflection yoke 2. And the second pair of magnet pieces for generating the quadripole magnetic field is mounted in the position shown by the plane 19 between said pair of magnet pieces and the deflection yoke 2. In case both side beams 8 and 9 discharged from the electron beam discharge ports of the electron gun 17 are directed in the opposing vertical directions, their orbits are made to change the directions firstly by the first pair of the magnetic pieces while secondly being changed into the direction to be back by the second pair of magnet pieces. Thereby, both side beams 8 and 9 are to proceed about along the plane including the tube axis and the horizontal axis 11 thus preventing generation of a misconvergence pattern.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a color picture tube device comprising a color picture tube enclosing an in-line electron gun and equipped with a deflection yoke and a static deflection adjustment mechanism.

2. Configuration of conventional 2-pin type and its problems As shown in FIG. 1, a color picture tube 1 having an in-line type electron gun enclosed therein is usually equipped with a deflection yoke 2 for self-convergence. Since the deflection yoke 2 generates a horizontal deflection magnetic field distorted into a bottle cushion shape and a vertical deflection magnetic field distorted into a barrel shape, a complicated dynamic convergence circuit is not required.

The static convergence adjustment mechanism 3, which is still attached to the neck of the color picture tube 1, generates a 4-pole or 6-pole static magnetic field for static convergence between the electron beam emission aperture of the electron gun and the deflection magnetic field. .

In FIG. 2a showing this relationship, among the three electron beam emission apertures 5°6.7 arranged on the horizontal axis 4,
The two side beams 8 and 9 emitted from the electron beam emission ports 5 and 7 on both sides passed through the static convergence adjustment position indicated by the horizontal axis 10 and the deflection plane indicated by the horizontal axis 11 and the vertical axis 12. Thereafter, the light passes through a slot in the shadow mask surface indicated by a horizontal axis 13 and a vertical axis 14 and hits a phosphor screen surface (not shown). Incidentally, the major axis of each of the many slots formed on the surface of the pager dough mask is arranged parallel to the vertical axis 14.

The color picture tube device configured in this way is designed and manufactured so that all the horizontal axes 4, 10, 11, and 13 are located in the same horizontal plane, but the accuracy during assembly of the electron gun electrode Due to errors or sealing errors when enclosing the electron gun in the glass pulp, the side beams 8 and 9 may be emitted with deviations in opposite vertical directions, as shown in Fig. 2b. be. In this case, the trajectory of both side beams 8 and 9 is corrected by static convergence adjustment, but this trajectory correction is performed so that both side beams 8 and 9 are concentrated at the center of the shadow mask surface.
Both side beams 8 and 9 at the deflection plane position are aligned with the horizontal axis 11
It does not intersect with the straight line 15 that is inclined at a certain angle θ with respect to the horizontal axis 11.

Therefore, as shown in FIG.
As the deflection angle increases, the side beams 8 and 9 that scan the image are divided into upper and lower parts, causing disturbances such as color shift in the reproduced image. Such misconvergence patterns can be corrected by moving the deflection yoke up and down, left and right, or by tilting (oscillating) it; therefore, those that exceed acceptable limits have no choice but to be discarded as defective products.

OBJECTS OF THE INVENTION Accordingly, it is an object of the present invention to provide a color picture tube device that can better correct the trajectories of both side beams, especially the trajectories near the deflection plane.

Structure of the Invention According to the color picture tube device of the present invention, the static convergence adjustment mechanism includes a first convergence adjustment mechanism for generating a multi-pole magnetic field, which is installed between the electron beam emission aperture and the deflection yoke of the in-line electron gun.
a pair of magnet pieces, and a multi-magnetic pole installed between the pair of magnet pieces and the deflection yoke to deflect both side beams that are deflected in opposite directions by the pair of magnet pieces in a direction opposite to said direction. A second pair of magnet pieces for generating a magnetic field is provided, and this will be described in detail on six pages below together with an embodiment shown in the drawings.

In FIG. 4, a color picture tube 1 having an in-line electron gun 17 enclosed therein is equipped with a self-convergence deflection yoke 2, and is equipped with a deflection yoke 2 for self-convergence. At the position indicated by plane 18, a first pair of magnet pieces for generating a multi-pole magnetic field, such as four poles, similar to the conventional one, is mounted. A second pair of magnet pieces for generating a quadrupole magnetic field is mounted at a position indicated by a plane 19 between this pair of magnet pieces and the deflection yoke 2.

When the side beams 8 and 9 emitted from the electron beam emission port of the electron gun 17 head in opposite vertical directions as shown in the figure, their beam trajectories are first changed by the first pair of magnet pieces, and then by the first pair of magnet pieces. The second pair of magnet pieces is used to change the direction back to the original state. As can be seen from FIG. 6 showing this situation, both side beams 8 and 9, which have changed direction at the position of the plane 18 and again at the position of the plane 19, are approximately aligned in a horizontal plane including the tube axis and the horizontal axis 11. In this state, it passes through the deflection surface. Therefore, after 6 pages, the occurrence of a misconvergence pattern as shown in FIG. 3 is prevented.

Note that each of the first and second pairs of magnet pieces installed at each position on the plane 18 and the plane 19 has a well-known structure in which a pair of magnet rings having two magnetic poles are slidably stacked on top of each other. This produces a four-pole static magnetic field as shown in FIG. As a result, both side beams 8 and 9 receive forces in opposite directions, and the magnitude of this force is determined by the coercive force of the pair of magnet pieces. Therefore, modifications such as configuring one or both of the first and second pairs of magnet pieces by a plurality of pairs of magnet pieces are possible.

Effects of the Invention Since the color picture tube device of the present invention is constructed as described above, by simply adding an extra pair of magnet pieces, it is possible not only to make use of color picture tubes that were conventionally disposed of, but also to improve convergence. Performance can be improved.

[Brief explanation of drawings]

Figure 1 is a side view of a conventional color picture tube device, 71°-
- Figures a and b in Figure 2 are diagrams showing beam trajectories to explain the static convergence operation of the same device, Figure 3 is a front view showing the misconvergence pattern of the same device, and Figure 4 is a diagram showing the implementation of the present invention. A schematic side view of the Shida color picture tube device. Figure 6 is a diagram showing the beam trajectory to explain the static convergence operation of the device. Figure 6 shows the quadrupole static magnetic field due to a pair of magnet pieces and the force acting on the electron beam. FIG. 1...Color picture tube, 2...Deflection yoke, 6°6.7...Electron beam emission aperture, 8,9...
...Side beam. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
Figure 5

Claims (1)

[Claims] A static convergence adjustment mechanism mounted on a color picture tube including an in-line electron gun so as to face a deflection yoke is configured to provide a multi-pole magnetic field installed between the electron beam emission port of the electron gun and the deflection yoke. A first pair of magnet pieces for generation, and a pair of side beams deflected in opposite directions by the pair of magnet pieces, between the pair of magnet pieces and the deflection yoke in order to deflect the side beams in a direction opposite to the above direction. A color picture tube device 0 characterized by comprising a second pair of magnet pieces installed for generating a multi-pole magnetic field.