JPS6126181B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cathode ray tube device suitable for application to color television picture tubes and the like.

In a television picture tube, in order to improve the sharpness of the image, the scanning speed of the electron beam in the scanning line direction, for example, the horizontal direction, on the fluorescent surface of the picture tube is modulated to modulate the substantial amount of light emitted from the fluorescent surface. What is done is done. In order to modulate the beam scanning speed in this manner, the electron beam is deflected, for example, in the horizontal scanning direction by the modulation signal, thereby substantially modulating the beam scanning speed.

The present invention provides a cathode ray tube device capable of modulating the scanning speed of the beam as described above, in particular, in which three or more electron beams corresponding to red, green, and blue are set in-line in the scanning line direction, that is,
For example, it is an object of the present invention to provide a cathode ray tube device that can be applied to cathode ray tubes arranged in a straight line in the horizontal scanning direction to reliably modulate the scanning speed of the beam, that is, deflect the electron beam. be.

Figure 1 shows an example of the electrode structure of an electron gun of a conventional cathode ray tube device in which three electron beams 1R, 1G, and 1B corresponding to red, green, and blue are arranged in-line. electron beam 1R,
Three electron gun structures G _R , G _G , G _B are constructed by arranging independent electrodes for 1G and 1B, respectively;
This is a case where these are arranged on a horizontal line. Each of the electron gun structures G _R , G _G and G _B has a cathode K, a first grid G ₁ , a second grid G ₂ , a third grid G ₃ and a fourth grid G ₄ arranged in this order, and the electron gun G G _R and G _B are arranged symmetrically on both sides of _G in a horizontal plane. In each of the electron guns G _R , G _G , and G _B , a bipotential main electron lens is configured by the third grid G ₃ and the fourth grid G ₄ .

The present invention provides a cathode ray tube device having an electron gun in which a plurality of electron beams are arranged in-line.
Regarding R, 1G and 1B, the arrangement direction, respectively,
That is, for example, by performing deflection in the horizontal direction, the beam scanning speed can be modulated.

An example of the present invention will be described in detail with reference to FIG. 2. In this example as well, three electron beams 1R, 1G, and 1B corresponding to red, green, and blue are aligned in a straight line along the horizontal direction, i.e. The parts in FIG. 2 that correspond to those in FIG. 1 are given the same reference numerals, and redundant explanation will be omitted. In the present invention, the third and fourth grids _G3 and _G4 forming electron lenses for each of the electron beams 1R, 1G and 1B are formed by a common electrode. and,
Particularly in the part where the electron lens action is not effective, that is, at a position a certain distance from the fourth grid _G4 of the third grid _G3 , this electron gun is connected in the axial direction of the electron gun, that is, to obtain the central electron beam _1G. It is composed of two parts G _3a and G _3b , which are divided into two parts with respect to the axis O. Figure 3 shows this third
In the perspective view of the grid _G3 , the third grid _G3 is connected to the second grid _G2 of each electron gun G _R , G _G and G _B .
The end plate 2a may be integrally formed with a flat cylindrical portion 3a, which commonly communicates with the beams 1R, 1G, and 1B extending from the end plate 2a in the axial direction. The other electrode portion G _3b also has a closed end plate 3a on the opposite side to the side facing the electrode portion G _3a , and each electron beam 1R,
It has a flat cylindrical portion 3b that can commonly communicate with 1G and 1B. The mutually opposing end surfaces 4a and 4b of the respective cylindrical portions _3a and _3b of both electrode portions G3a and G3b obliquely intersect with the axis O, and the electron beam 1
It is an inclined end face perpendicular to the arrangement plane of R, 1G and 1B, that is, the horizontal plane. Also, both electrode parts G _3a and G _3b
The respective end surfaces 4a and 4b are opposed to each other with uniform intervals maintained between each part. Also, one electrode part G
Each electron beam 1 is connected to the closed end plate 2a of _3a .
Through holes passing through R, 1G and 1B h _3R , h _3G , h _3
B , is perforated, and the end plate 3a of the other electrode part _G3b
It has cylindrical portions 5R, 5G, and 5B that protrude into the cylindrical portion 3b by squeezing or the like and through which electron beams 1R, 1G, and 1B pass, respectively. The axial length of each of these cylindrical parts 5R, 5G, and 5B can be selected to be equal to or larger than the diameter φ.

On the other hand, the fourth grid _G4 , which is provided in common for each electron beam, for example, is connected to each electron beam 1R,
For example, a flat cylindrical portion 6 that commonly connects 1G and 1B.
a, a closed end plate 6b integrally provided at the end opposite to the third grid _G3 , and an end plate 6c mechanically attached to the opposite side by welding or the like. It has the following. The end plate 6b is provided with a cylindrical portion 6a, which is formed on the same axis by squeezing, corresponding to each cylindrical portion 5R, _5G , 5B of the electrode portion _h3b of the third grid G3. Cylindrical portions 7R, 7G and 7B protruding inward
will be established. Further, the other end plate 6c is provided with through holes h _4R , h 4G, and h _4B through which the electron beams 1R, _1G , and 1B pass, respectively.

Both electrode portions G _3a and G _3b of the third grid G ₃ include
In terms of direct current, the same voltage, for example, a low voltage of 4 to 5 kV, is applied to the fourth grid _G4 , and an anode voltage, that is, a high voltage of about 20 to 25 kV, is applied to the electrodes _G3 and _G4.
A bipotential main electron lens is formed by . And the third grid
For example, a scanning speed modulation signal of an electron beam is applied between both electrode portions G _3a and G _3b of G ₃ .

When such a configuration is adopted, as described above, the third grid G ₃ and the fourth grid G ₄ produce an electron lens effect on the respective electron beams 1R, 1G, and 1B, but the electrodes of the third grid G ₃ Part G _3b
When the lengths of the cylindrical parts 5R, 5G, and 5B are selected to be approximately equal to or larger than the diameter, most of the high pressure permeation from the fourth grid _G4 occurs in these cylindrical parts 5R, 5G, and 5B. 5B only on the cathode side, that is, both electrode parts G _3a and G _3b
Between the end faces 4a and 4b of the fourth grid
Since there is almost no penetration of the high voltage of G ₄ and no effect of electron lens action occurs, static electricity is generated between both end plates 4a and 4b according to the signal voltage applied between both electrode parts G _3a and G _3b . Only an electric field is generated. and,
The opposing end surfaces 4a and 4b of these electrode portions _G3a and _G3b are selected so as to be perpendicular to the arrangement plane of the electron beams 1R, 1G and 1B in the arrangement direction, that is, the scanning direction, and to intersect obliquely with the axis O. Therefore, the electrostatic field generated between the end surfaces 4a and 4b has a component related to the scanning direction of each electron beam, that is, the horizontal direction, so that each beam 1R, 1G, and 1B is horizontally subject to directional deflection. In other words, both electrode portions G _3a and G _3b
Each of the beams 1R, 1G, and 1B is deflected in the horizontal scanning direction in accordance with a modulation signal applied between them, such as a scanning speed modulation signal, and is deflected in a superimposed manner along with the deflection by the horizontal deflection means of each beam (not shown). As a result, the scanning speed on the fluorescent surface is modulated. That is, scanning speed modulation is performed.

In the example illustrated in FIGS. 2 and 3,
In this case, the opposing end surfaces 4a and 4b of both electrode portions _G3a and _G3b form a plane that is orthogonal to the horizontal plane and diagonally intersects with the axis O.As shown in FIG. When forming a zigzag pattern so that a horizontal deflection electric field is generated in each beam at the passing portions of 1R, 1G and 1B,
Intersection angle θ with the axis of each beam passing part
can be made sufficiently small, and the horizontal deflection electric field can be made sufficiently large.

Alternatively, as shown in FIG.
End plate 4a at the passing portion of R, 1G and 1B
It is also possible to make the modulation deflection electric field in the horizontal direction even stronger by making the electron beams 4b and 4b face each other across the traveling direction of the electron beam.

Furthermore, in the examples shown in FIGS. 2 to 5, the electrostatic modulation electric field is formed by the opposing end surfaces of the electrode portions G _3a and G _3b themselves.
For example, as shown in FIG. 6, one electrode portion G _3a has a cylindrical shape protruding into the other electrode portion G _3b , or a parallel protrusion extending along a horizontal plane faces the beams 1R, 1G, and 1B across them. Flat plates 9 _a1 and 9 _a2 are formed, and their tips are perpendicular to the horizontal plane and have inclined surfaces that intersect obliquely with the axis O, so that the end faces of the flat plates 9 _a1 and 9 _a2 and the electrode part G _{3 b} It is also possible to form a deflection electric field in the horizontal scanning direction by an electrostatic deflection electric field generated between the cylindrical portion 3b and the cylindrical portion 3b. Further, the protruding plate portions 9 _a1 and 9 _a2 may have a zigzag pattern similar to that illustrated in FIG. 4 or 5, as shown in FIG. 7.

FIG. 8 shows another example of the device of the present invention. In this example, one electrode portion G _3a projects from the other electrode portion G _3b and corresponds to each electron beam 1R, 1G and 1B, respectively. Deflection plates 10R, 10G, and 10B are provided so as to face one side of each beam path, are substantially perpendicular to the scanning line direction of the beam, and are erected along the beam path. Vertical deflection plates 11R, 11 are provided in the other electrode portion _G3b so as to sandwich the passages of 1G and 1B and face the deflection plates 10R, 10G and 10B.
G and 11B, each deflection plate 10R, 10
This is a case where a horizontal electrostatic deflection electric field is formed between G, 10B and 11R, 11G, and 11B. In this case, one of the deflection plates 10R, 10G
and 10B are electrically and mechanically (especially electrically) connected to the electrode portion G _3a , and the other deflection plates 11R, 1
1G and 11B are electrically and mechanically (especially electrically) connected to the electrode part G _3b , and both the electrode parts G _3a and G _3b
The deflection plate 10 is
R, 10G, 10B and 11R, 11G, 11B
In between, a horizontal electrostatic deflection electric field is generated for each of the electron beams 1R, 1G, and 1B.
In FIGS. 4 to 8, parts corresponding to those in FIGS. 2 and 3 are designated by the same reference numerals, and redundant explanation will be omitted.

In the above example, the first grid G ₁ and the second grid G ₂ are individually provided for each electron beam 1R, 1G, and 1B. It can also be made into an electron gun type structure.

Furthermore, in the above example, the present invention is mainly applied to scanning velocity modulation of an electron beam.
It can also be used for convergence correction, etc.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the electrode arrangement structure of a conventional in-line double beam double electron gun type cathode ray tube device, and FIG. 2 is a sectional view showing the electrode arrangement structure of an electron gun of an example of the cathode ray tube device according to the present invention. 3 is a perspective view of the main part, FIG. 4, FIG. 5, and FIG. 8 are sectional views showing the electrode arrangement structure of other examples of the device of the present invention, and FIG. 6 and FIG. It is a perspective view of the principal part of still another example. K is a cathode, _G1 to _G4 are first to fourth grids, 1R, 1G and 1B are electron beams, and _G3a and _G3b are electrodes of the third grid _G3 .

Claims (1)

[Claims] 1. In a cathode ray tube device equipped with an electron gun that obtains a plurality of electron beams arranged in-line, an electrode that includes a portion that hardly acts as an electron lens among the electrodes constituting the electron gun is used for the plurality of electron beams. The electrode is composed of a common electrode, and the electrode is composed of first and second electrode parts divided in the axial direction of the electron gun, and the electron beam is separated between the first and second electrode parts. A cathode ray tube device configured to electrostatically deflect the electron beam by applying a voltage that generates an electrostatic field in the direction in which the electron beams are arranged.