JPS5983329A - Color picture tube device - Google Patents

Abstract

PURPOSE:To prevent misconvergence and improve a focusing characteristic by composing the captioned device a mask for color discrimination, a screen opposing thereto and a deflection yoke which generates pincushioc magnetid field and barrel magnetic field while offcentering the magnetic field distribution against the neck part. CONSTITUTION:A shadow mask 8 for color discrimination is arranged opposing to a phosphor screen 2 while a deflection yoke 9 which generates a strong pincushion magnetic field for horizontal deflection and a strong barrel magnetic field for vertical deflection crossing orthogonally thereto, is prepared. In said deflection yoke 9, a horizontal coil 13 and a vertical coil 14 are wound around its core 15 while the coils 13 and 14 on both sides are all wound mecanically and symmetrically with respect to the central axis C1. Further, for instance, only the left side is provided with a spacer 16 on the part making contact with the neck part. Accordingly, the deflection magnetic field can offcenter the center axis C1 to C2.

Description

[Detailed description of the invention] It is related to

The first section provides an overview of conventionally used color picture tube devices.
As shown in the figure.

In this figure, (1) is a glass pulp as a vacuum container, a panel part (3) with a striped or dot-shaped fluorescent screen (2) formed on the inner surface, and a funnel connected to this panel part (3). The funnel part (4) has a neck part (5) projecting rearward from the funnel part (4). There are three electron beams (
An electron gun (7) for generating, focusing and accelerating the electron beam (6) is provided in an in-line arrangement, and a shadow mask (8) for color selection is arranged opposite the fluorescent screen (2). The electron beam (6) from the electron gun (7) passes through the apertures of the shadow mask (8) and onto the fluorescent screen (2).
and is scanned over the fluorescent screen (2) by a deflection yoke (9) provided around the neck (5). (10) is a protective band to prevent implosion of the glass bulb (1), (111 is a mounting ear, and (12) is a neck assembly for absorbing the electron gun (7) and other assembly errors.

The combination of an in-line electron gun (7) and a deflection yoke (9) that generates a strong bottle cushion magnetic field for horizontal deflection and a strong barrel magnetic field for vertical deflection produces three electron beams. (6) The fluorescent screen (2)
You can concentrate on the entire surface of the screen. The problem here is that the magnetic field caused by the deflection yoke (9) is a strong bottle cushion or a strong barrel magnetic field, so when scanning the peripheral area of the fluorescent screen (2), the electron beam (6)
It is natural for the object to change shape. This can be seen by observing the degree of deformation in a conventionally used deflection yoke with a nearly uniform magnetic field distribution.

Recently, the pitch of the holes in the shadow mask (8) has been reduced, and many picture tube devices have been used for computer displays, but there are a wide variety of types of phosphors used in such cases. Furthermore, for characters that often display letters, in addition to the traditional color combination of red, green, and blue, combinations of red, green, and white are often used. The reason for this is the fact that the display of characters in blue-color is almost difficult to distinguish. Therefore 1. For example, "white" in the above explanation
The color is not white, which is the emitted color of the phosphor for conventional black-and-white televisions, but a color that is intermediate between white and blue, such as so-called sky blue, which is a mixture of white and blue, is also used. There is.

Figure 2 is a schematic diagram illustrating the spacing of the electron beams near the deflection yoke. ), (6G), and (6R) are shown. Here, (6B), (6G).

(6R) are electron beams that make blue, green, and red phosphors shine, respectively. The distance of both side electron beams (6B) and (6R) from the center electron beam (6G) at the deflection center plane RL is SB. Here, the outer diameter of the neck part (5) φ
A is closely related to 5B above, but in general, φA
It is known that the larger the value, the longer the focus electrode of the electron gun (7) for focusing the deuteron beam (161) on the fluorescent screen (2), which is more advantageous. On the other hand, in that case, SB on the deflection center plane RL becomes large.

Figure 3 shows three electron beams (6) directed to a fluorescent screen (2).
) shows the difficulty of achieving convergence on the curve above, with the vertical axis representing the amount of misconvergence and the horizontal axis representing SB at the deflection center plane RL. This difficulty is approximately S B 2
It is said to be proportional to That is, the electron beam (6
) on the fluorescent surface (2), it is necessary to use a deflection yoke (9) with a non-uniform distribution as explained above. )
Deterioration of quality on the fluorescent screen (2) is unavoidable. Therefore, if you are trying to improve the focus quality even a little, you will be faced with the dilemma that it is better to have a larger neck outer diameter φA, but if you do so, you are at a disadvantage in terms of misconvergence.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a color picture tube device that can reduce misconvergence and focus characteristic noise.

The structure of the color picture tube device according to the present invention is no different in appearance from that shown in FIG. However, the relationship between the deflection yoke (9) and the electron beam (6) is different from the conventional one.

The deflection magnetic field used in the device of the present invention requires less of the conventional bottle cushion magnetic field and barrel magnetic field, and its distribution is asymmetrical with respect to the center axis C of the neck portion (5). That is, conventionally, the deflection yoke has created a magnetic field that is symmetrical with respect to the center axis (tube axis) C of the neck portion (5) shown in FIG. however,
The deflection yoke used in the color picture tube device of this invention deflects the electron beams (6G) and (6R) in a deflection magnetic field.

In order to make the experienced magnetic fields almost equal, a magnetic field distribution is formed in which the central axis of deflection is shifted by SB/2 from the center axis C of the neck part (5) on the central deflection plane (RL), so to speak. .

In addition, in the past, the deflection yoke was designed to concentrate the electron beams on both sides over the entire surface, and it was also difficult to align the center electron beam, but in the case of this invention, the deflection yoke can be Of the electron beams, the light spot of a particular electron beam is purposely kept from concentrating on the fluorescent screen with the light spots of a plurality of other electron beams. For example, only two electron beams (6G) and (6R) in FIG. 2 are concentrated. In other words, conventionally 5B
It would have been necessary to concentrate an amount proportional to the amount of +SB, but in the case of this invention, only an amount of 3B is sufficient. Therefore, it is significantly advantageous in terms of convergence variation. Furthermore, the fact that the distance between the electron beams concentrated by the deflection yoke (9) is reduced to 1/2 means that the magnetic field of the bottle cushion/barrel does not have to be as strong as explained above. In other words, it is easier in terms of variations in the deflection yoke and the picture tube. Furthermore, since both the horizontal and vertical magnetic fields approach the direction of the uniform magnetic field, it is advantageous in terms of focus characteristics.

Figure 4 shows the improved deflection yoke (9) used in this invention.
) explains the concept of As mentioned above, in the case of this invention, an electron beam (6G) is used.

It was necessary to create a magnetic field distribution that is 11 degrees symmetrical with respect to (6R). In other words, the deflection yoke (9) had to be made asymmetrically. However, this deflection yoke is difficult to make. Figure 4 shows a structure in which the deflection yoke (9) is slightly easier to operate.
The coil is a vertical coil (wound on a 1ω core.Moreover, the left and right coils (13) and (14) in the figure
are wound mechanically symmetrically with respect to the center axis CI. Further, for example, only on the left side, a space (16) is provided at the portion that contacts the neck portion. For example, the thickness of this spacer (16) or the unbalanced thickness between the left and right sides is 6 mm.

When such a deflection yoke (9) is attached to a color picture tube, the deflection magnetic field generated by this deflection yoke (9) mechanically shifts the center axis CI to C2 (off-center) by 8 degrees. can be done.

As mentioned above, the color picture tube device of the present invention has a configuration of a deflection yoke and an electron gun that concentrate only a specific electron beam among a plurality of electron beams.
A color picture tube device with small misconvergence and excellent focus characteristics can be provided.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram including a partially broken part of a color picture tube device to which the present invention is applied, FIG. FIG. 3 is a diagram illustrating the distance between electron beams at the center plane of deflection of the electron beams and the difficulty of convergence characteristics, and FIG. 4 is a diagram showing another embodiment of the present invention. (2)... Fluorescent screen, (5)... Neck part,
(6)...electron beam, (7)...electron gun, (8)
...Shadow mask, (9)...1 oblate yoke. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Makoto Kuzuno (1 other person) Figure 1 Figure 2

Claims (2)

[Claims] (1) An electron gun that generates, focuses, and accelerates a plurality of electron beams arranged in-line, a shadow mask for color selection, and a fluorescent screen facing the shadow mask;
A deflection yoke that generates a bottle cushion magnetic field as a deflection magnetic field and a barrel magnetic field in a direction perpendicular to this, and a deflection yoke in which the distribution of the magnetic field is made several tones or more off-center with respect to the neck part, and is in an adjusted state. Then, among the plurality of electron beams of the electron gun, on the fluorescent screen, the light spot of a specific electron beam is not concentrated with the light spots of the other plurality of electron beams. (A color picture tube device characterized by the following. (2) The deflection coils are mechanically wound in a symmetrical manner.
1. 2. The color picture tube device according to claim 1, which is attached to the neck part with an offset of m+n or more.