JPS63226858A - Color picture tube device - Google Patents

Abstract

PURPOSE:To reduce the distortion of an electron beam deflected in the horizontal direction and improve the resolution by nearly unifying the strength of the auxiliary deflecting magnetic fields formed by magnetic field correcting bodies in their regions. CONSTITUTION:The horizontal deflecting magnetic field consists of the barrel- shaped horizontal main deflecting magnetic field 1 and the anti-symmetrical auxiliary deflecting magnetic fields 2, 3. Magnetic field correcting bodies 4B, 4G, 4R are arranged in the auxiliary deflecting magnetic fields. The shape of magnetic fields formed in the regions of the magnetic field correcting bodies 4B, 4G, 4R is unified as shown by 2U, 3U. Accordingly, the action to distort electron beams R, G, B is made very small, and the resolution can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a color picture tube device equipped with an in-line electron gun, and more particularly to an in-line color picture tube device equipped with a deflection device.

(Prior art) An in-line color picture tube device is equipped with a panel equipped with a phosphor screen coated with phosphors that emit light in three colors: red, green, and blue, and an electron gun that irradiates an electron beam toward the phosphor screen. The envelope is a funnel that connects the neck and the panel. Inside the neck, there is an in-line electron gun that emits three electron beams from the center and both sides, and outside the funnel, the electron beam from the electron gun hits the display area of the phosphor screen. A deflection magnetic field generator is installed to deflect the electron beam in horizontal and vertical directions. In addition, a shadow mask is placed on the inner surface of the panel in close proximity to the phosphor screen, so that the electron beams that pass through a number of small openings in this shadow mask impinge on predetermined positions on the three-color phosphors. ing.

Now, in order for the three electron beams emitted from the electron gun to converge on the phosphor screen, the deflection magnetic field generator has been devised so that the horizontal deflection magnetic field is shaped like a bottle cushion and the vertical deflection magnetic field is shaped like a barrel. is being done. This is called a self-convergence type magnetic field.

Such a self-concentrating magnetic field has many advantages, such as eliminating the need for various terminals, convergence yokes, and convergence circuits necessary for beam concentration adjustment. However, since the distortion of the magnetic field is used to self-focus the beam, it has the disadvantage that the shape of the electron beam on the phosphor screen is distorted.

Figure 16(a) shows the shape of the electron beam deflected to the horizontal edge of the phosphor screen, which has a distorted shape divided into a horizontally long bright core part (22) and a vertically long dark halo part (23). . In addition, M16 diagram (b) shows the shape of the electron beam deflected to the vertical end of the phosphor screen, with a small bright vertically elongated core part (24),
It has a distorted shape, separated by a large, dark, vertically elongated halo (25-).

As a technology to improve the distortion of the electron beam shape, he invented a horizontal deflection magnetic field and filed a patent application earlier.

This means that when the center of the phosphor screen is the starting point, the axis extending horizontally is the X axis, the axis extending vertically is the Y axis, and the axis perpendicular to the phosphor screen is the Y axis, the horizontal deflection magnetic field is the Y axis and the Y axis. A barrel-shaped main deflection magnetic field that is symmetrical with respect to the plane (Y-Z plane) containing the axis and has a mainly vertical component in the electron beam passage region, and a plane that includes the Y-axis and two axes (Y'-Z plane). On the other hand, it is designed to have an auxiliary deflection magnetic field that is oppositely symmetrical and has a mainly vertical component in the electron beam passing region. According to the invention, the shape of the electron beam deflected to the horizontal edge of the phosphor screen has a halo portion that is very small, and an improved bright core portion appears.

However, the shape of the electron beam (core portion) is still horizontally long, and there is still room for further improvement.

(Problems to be Solved by the Invention) As described above, in-line cathode ray tube devices have the problem that the shape of the electron beam deflected in the horizontal direction is distorted, which is one of the causes of resolution deterioration in color picture tubes. .

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an in-line cathode ray tube device in which horizontally deflected electron beams are less distorted and resolution is further improved.

[Structure of the Invention] (Means for Solving the Problems) The present invention includes a vacuum envelope, a phosphor screen disposed inside the envelope, and three tubes facing the phosphor screen at the center and on both sides. A collar comprising: an in-line electron gun that irradiates an electron beam; and a deflection magnetic field generator that deflects the electron beam in horizontal and vertical directions so that the electric beam hits a predetermined display area of the phosphor screen. It is intended for picture tube devices.

The present invention is based on the center of the phosphor screen, with the axis extending in the horizontal direction as the X axis, the axis extending in the vertical direction as the Y axis, and the axis perpendicular to the phosphor screen as the Y axis. It has an auxiliary deflection magnetic field which has a vertical component and mainly has a vertical component in the electron beam passage area, and in this auxiliary magnetic field there are magnetic fields with high magnetic permeability placed close to each irradiation lightning beam on at least both sides. It has a magnetic field corrector made of a magnetic material.

A further feature is that the strength of the auxiliary deflection magnetic field formed by the magnetic field corrector is substantially uniform within the region formed by the magnetic field corrector.

Regarding the positional relationship between the horizontal main deflection magnetic field intensity peak and the auxiliary deflection magnetic field intensity peak, the horizontal main deflection magnetic field intensity peak is closer to the phosphor screen, and the auxiliary deflection magnetic field intensity peak is closer to the electron gun.

(for production) First, the horizontal deflection magnetic field in the present invention will be explained in detail.

In the present invention, the horizontal deflection magnetic field includes a horizontal main deflection magnetic field (1) having a barrel shape as shown in FIG.
It consists of an antisymmetrical auxiliary deflection magnetic field (2H3) like this.

Roughly, magnetic field correctors (4B) (4G) (4fl) as shown in Fig. 2(a) are arranged in this auxiliary deflection magnetic field, and the magnetic field correctors (4B) (4G) (4R) area Since the magnetic field shape formed in the electron beam (R) (G) (
The effect of distorting B) becomes very small.

FIG. 2(b) is a perspective view of this magnetic field corrector.

The difference between the horizontal main deflection magnetic field strength and the auxiliary deflection magnetic field strength ・
The positional relationship is distributed as shown in FIG. 3(a), where the peak position of the horizontal main deflection magnetic field strength is closer to the phosphor screen, and the peak position of the auxiliary deflection magnetic field strength is closer to the electron gun.

Note that the position O on the horizontal axis in FIG. 3(a) is the position where the magnetic field corrector is attached, for example, the top of the electron gun;
The axis represents the relative distance from the magnetic field corrector to the phosphor screen.

In Equation (1), B3, which is a secondary component, influences the horizontal deflection magnetic field.

On the other hand, it is expressed by the strength of a magnetic field that is antisymmetric with respect to the Y-Z plane, and in this equation (2), it is the primary component ~ that influences the horizontal auxiliary deflection magnetic field. FIG. 3(b) is a diagram showing a weighting function regarding the influence of the horizontal main deflection magnetic field and the auxiliary deflection magnetic field in FIG. 3(a) on electron beam concentration (convergence) and beam spot shape.

As shown in the figure, the weighting function of the horizontal main deflection magnetic field (dashed line) is large on the phosphor screen side, and the weighting function of the auxiliary deflection magnetic field (solid line)
is a big success on the electron gun side.

The influence of the deflection magnetic field on the electron beam is proportional to the product of the magnetic field strength in Figure 3 (a) and the weighting function in Figure 3 (b).
This situation is shown in FIG. 3(C).

From the above, it is understood that the electron beam traveling from the electron gun toward the phosphor screen is first affected by the auxiliary deflection magnetic field and then by the horizontal main deflection magnetic field.

Next, the state of the electron beam used in the present invention will be explained step by step.

If only the main deflection magnetic field were applied to the electron beam emitted from the electron gun, the shape of the electron beam deflected toward the horizontal edge of the phosphor screen would have a halo that partially disappeared, as shown in Figure 4 (a). Only the vertically elongated core portion (5) will now be exposed. However, the concentration of the three electron beams becomes slightly overconcentrated. Figure 4(b) shows this situation, where the thick line frame represents the fluorescent screen (screen), and the thin vertical line represents the landing position of one beam (for example, the red light emitting beam) behind the three electron beams. , the thin broken lines each represent the landing position of the other beam (for example, the beam for blue light emission) among the three electron beams.

Next, when an auxiliary deflection magnetic field as specified in the present invention is applied in this state, the horizontally deflected electron beam shape becomes as shown in Fig. 5(a).
As shown in FIG. 5(b), a horizontally elongated core portion (6) with few halos appears, and as shown in FIG. 5(b), a good concentration characteristic is obtained in which the electron beams on both sides are almost coincident with each other.

Furthermore, in this state, if a magnetic field corrector made of a magnetic material with high magnetic permeability is placed close to the electron beam in the auxiliary magnetic field, the horizontally deflected electron beam will have a halo part that is very large, as shown in Figure 6(a). A small, slightly laterally elongated core portion (7) appears, and good concentration characteristics are obtained in which the electron beams on both sides are almost coincident with each other, as shown in FIG. 6(b).

The magnetic field corrector will be explained.

Figure 7(a) shows the electron beam emitted from the electron gun (B)
(G) (1'?) and the shape (arrow) of the auxiliary deflection magnetic field that acts on them. In the absence of a magnetic field corrector, a magnetic force acts on the electron beams (B), (G), and (R) as shown in FIG. 7(b). In other words, the magnetic force shown by the long arrow acts on the outermost part of the side beam (IS) (tit), and the magnetic force shown by the short arrow acts on the innermost part of the side beam (B) (R), so both side beams A magnetic force acts to make the shape horizontally long.

It should be noted that equal and opposite magnetic forces act on the center beam (G) on the left and right sides.

Here, if a magnetic field corrector (4B) <4G) (4R) is placed in the auxiliary deflection magnetic field as shown in FIG. Therefore, the magnetic force that makes the shape horizontally elongated as described above is reduced and acts only slightly on the electron beam passing through this region.

FIG. 7(d) shows the distribution of the magnetic field strength (vertical axis) at each position (horizontal axis) when FIG. 7(C) is viewed in plan. b-b= )
intensity distribution (dashed line) and magnetic field correction extracorporeal region (a-a”
'') shows the intensity distribution (solid line).As shown in this figure, the magnetic field corrector (4B) corresponds to the area sandwiched by (4G> (4R)) (481) (lG1) (1111
), the magnetic field strength is almost uniform, and therefore the beam shape of the three electron beams passing through this region is good (slightly horizontally elongated).

As described above, when the electron beam is influenced by the auxiliary deflection magnetic field and further advances into the horizontal main deflection magnetic field dominated region, the shape of the electron beam becomes closer to a circle due to the influence of the barrel magnetic field.

As described above, according to the present invention, it is possible to realize an in-line color picture tube with a good electron beam shape on a phosphor screen and good three-electron beam concentration characteristics.

(Example) The present invention will be explained in detail with reference to the drawings.

FIG. 8 is a schematic cross-sectional view of the color picture tube device of the present invention. Panels (8), funnels (9), and necks (1
0) constitutes an envelope, and on the inner surface of the panel (8) is formed a phosphor screen (11) on which red-emitting phosphor dots, green-emitting phosphor dots, and blue-emitting phosphor dots are regularly deposited. has been done.

Inside the neck (10), there are three electron beams (13) (G) (1?) in the center and on both sides facing the fluorescent screen (11).
) is built in, and the electron beams (B), (G), and (R) are generated by a horizontal deflection magnetic field generator and a vertical deflection magnetic field generator placed outside the funnel (9). It is deflected and hits the display area of the phosphor screen (11). The inside of the panel (8) has a fluorescent screen (
A shadow mask (12) is disposed close to and facing the shadow mask (11), and an opening is formed in the shadow mask (12).

Next, the deflection magnetic field will be explained in detail.

The vertical deflection magnetic field in the present invention may be of a known type, and is formed, for example, by a toroidal coil (15) that generates a barrel magnetic field and is wound around a ferrite core (14). .

The horizontal deflection magnetic field in the present invention is a combination of a horizontal main deflection magnetic field and an auxiliary deflection magnetic field, and this combination is novel.

The horizontal main deflection magnetic field is applied to the separator (16
), and the horizontal auxiliary deflection field is formed by a toroidal coil (18) wound around a ferrite core (14).

Therefore, the ferrite core (14) has a vertical deflection coil (
15) clj and auxiliary deflection coil (18) are wound.

Figure 9(a) is an enlarged view of the ferrite core 1 (size) and toroidal coil (18) of the auxiliary deflection magnetic field, and Figure 9(b) is the current flowing through the toroidal coil shown in Figure 9(a). It is a figure showing the relationship between and time.

Note that FIG. 9(a) shows the vertical deflection coil (1s% is not shown).

The vertical deflection magnetic field generation coil, the horizontal main deflection magnetic field generation coil, and the horizontal auxiliary deflection magnetic field generation coil are combined with each other and attached to the outside of the collar receiving tube using adjusted wedges (19).

The final electrode (20) and the shield member (21) of the electron gun (13) are located almost near one end of the deflection device, and the magnetic field corrector (413) (4G) (4R) absorbs the electrons of the shield member (21). Installed near the beam passage hole.

FIG. 10 is a perspective view of the magnetic field corrector (4B) (4G) (4R) attached to the shield member (21). Permalloy or other material having high magnetic permeability is used as the magnetic field corrector.

Due to the structure described above, even if the electron beam emitted from the electron gun is deflected to a certain degree by the vertical and horizontal deflection magnetic fields, the distortion of the electron beam is small due to the various effects described above, and a color image with good resolution is produced. A picture tube device can be realized.

The toroidal coil forming the auxiliary deflection magnetic field in the present invention may be the one shown in FIG. 11 or FIG.
A current as shown in Fig. 14 may be passed through the coil shown in Fig. 2.

It is also possible to form an auxiliary deflection magnetic field by passing a current as shown in FIG. 14 through the saddle coil shown in FIG. 13.

When the current shown in Fig. 14 is passed through the coil shown in Fig. 12 or 13, it is possible to form the horizontal main deflection magnetic field and the auxiliary deflection magnetic field with one set of coils, but the generated magnetic field is shown in Fig. 1. The magnetic field is a superposition of (a) the horizontal main deflection magnetic field and (b) the auxiliary tq direction magnetic field. Even in such a case, the magnetic field shapes and field strengths of the horizontal main deflection magnetic field and the auxiliary deflection magnetic field can be changed independently by selecting the shape of the coil or the current flowing through the coil.

The shape of the magnetic field corrector is shown in Figure 15 (a) and Figure 15 (b).
It may also be as shown in

The magnetic field corrector is not limited to the final electrode, but may be attached to the focusing electrode or the like.

[Effects of the Invention] As described above, according to the present invention, the distortion of the deflected electron beam is reduced, and a color picture tube device with good resolution can be realized.

[Brief explanation of drawings]

3 is a diagram showing the relationship between the horizontal main deflection magnetic field and the auxiliary deflection magnetic field according to the present invention, and FIGS. 4 to 6 are diagrams showing the relationship between the horizontal deflection magnetic field and the magnetic field corrector according to the present invention. 7 is a diagram illustrating how the concentration changes, FIG. 7 is a diagram illustrating the action of the magnetic field corrector according to the present invention, FIG. 8 is a schematic sectional view of the color picture tube device of the present invention, FIGS. 9 and 11.
Figures 12 and 13 are diagrams showing the schematic shapes of the auxiliary deflection forming core and coil according to the present invention, Figures 10 and 15 are diagrams showing the schematic shape of the magnetic field corrector according to the present invention, FIG. 14 is a diagram showing the current flowing through the coils of FIGS. 12 and 13, and FIG. 16 is a diagram showing the shape of an electron beam deflected in a conventional color picture tube device.

Claims (2)

[Claims] (1) A vacuum envelope, a phosphor screen disposed within the envelope, an in-line electron gun that irradiates three electron beams at the center and on both sides toward the phosphor screen, and the electron beam is and a deflection magnetic field generating device for deflecting an electron beam horizontally and vertically so as to strike a predetermined display area of the phosphor screen, the color picture tube device comprising: a deflection magnetic field generating device that deflects an electron beam horizontally and vertically so as to strike a predetermined display area of the phosphor screen; When the axis is the X axis, the axis extending in the vertical direction is the Y axis, and the axis perpendicular to the phosphor screen is the Z axis, the horizontal deflection magnetic field from the deflection magnetic field generator is generated in a plane including the Y axis and the Z axis (Y-Z plane). ) is almost symmetrical with respect to the electron beam passage area and has a mainly vertical component in the electron beam passage area. It has an auxiliary deflection magnetic field that mainly has a vertical component in the passing region, and in this auxiliary magnetic field, there is a magnetic field corrector made of a magnetic material with high magnetic permeability, which is arranged close to each irradiation electron beam on both sides at least. A color picture tube device characterized in that the strength of the auxiliary deflection magnetic field formed by the magnetic field corrector is substantially uniform within the region formed by the magnetic field corrector. (2) The peak position of the strength of the auxiliary deflection magnetic field is on the side closer to the electron gun, and the peak position of the strength of the horizontal main deflection magnetic field is on the side closer to the phosphor screen. Color picture tube device as described.