JPS63308851A - Color picture tube device - Google Patents

Abstract

PURPOSE:To reduce distortion of deflected electron beams and to improve their resolution by forming a vertical deflection magnetic field in an inclined magnetic field generating device almost symmetrically to a flat plane including X, Z axes and by generating a pin cushion-shaped vertical main deflecting magnetic field or the like, which mainly has a horizontal component in an electron beam passing region. CONSTITUTION:A horizontal deflecting magnetic field in a color picture tube is formed of a barrel-shaped horizontal main deflecting magnetic field 1 and horizontal auxiliary deflecting magnetic fields 2, 3 which are symmetrically shaped opposite to the magnetic field 1. This picture tube is composed of a panel 8, a funnel 9, a neck 10, and an envelope. A phosphor screen 11 made of respective phosphor dots is formed on an inner surface of the panel 8. An electron gun 13 is disposed on an inner surface of the neck 10, and electron beams B, G, R are radiated on the phosphor plane 11. A coil 17 wound in a saddle shape on an inner surface of a separator 16 is used to form a horizontal main deflecting magnetic field from a combination of the main deflecting magnetic field and the auxiliary deflecting magnetic field. The horizontal auxiliary deflecting magnetic field is formed by a toroidal coil 18-1.

Description

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

(Prior Art) An in-line color picture tube device is a panel equipped with a phosphor screen coated with phosphors that emit three colors of red, green, and blue.

The envelope includes a neck equipped with an electron gun that irradiates an electron beam toward the phosphor screen, and 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 tendency magnetic field generating device is installed which directs the electron beam in the horizontal direction and in the MiX orthogonal white direction. 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 the many small apertures in this shadow mask strike predetermined positions on the three-color phosphor. There is.

Now, in order to converge the three electron beams emitted from the electron gun onto the phosphor screen, we devised a deflection magnetic field generator so that the horizontal deflection magnetic field has a bottle cushion shape and the vertical deflection magnetic field has a barrel shape. 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 for self-focusing of the beam, there is a drawback that the shape of the electron beam on the phosphor screen is distorted.

Figure 20(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). . Moreover, FIG. 20(b) shows the shape of the electron beam deflected to the vertical end of the phosphor screen, which includes a small bright vertically elongated core part (24),
It has a distorted shape, separated by a large, dark, vertical halo part (25).

In order to solve this problem, JP-A-61-2!1283
Publication No. 9 describes that in a color picture tube device in which three electron beams are made parallel to each other and irradiated onto a fluorescent screen, the horizontal deflection magnetic field is almost uniform, and the vertical deflection magnetic field is a main deflection magnetic field that is vertically symmetrical with respect to the tube axis. The invention of a color picture tube is disclosed, which comprises an additional deflection magnetic field that is applied synchronously with the main deflection magnetic field and is vertically asymmetrical with respect to the tube axis.

In this invention, since the three electron beams are irradiated almost parallel toward the phosphor screen, the three color electron beams do not coincide on the phosphor screen, resulting in five color shifts, so a time delay is added to each of the three color image signals. The method is to match the images on the phosphor screen.

That is, in the case of deflecting an electron beam near the upper and lower ends of a phosphor screen, the technique disclosed in Japanese Patent Application Laid-Open No. 61-292839 uses a vertical deflection magnetic field formed by a vertically symmetrical main deflection magnetic field and a vertically asymmetrical additional deflection magnetic field. This makes it possible to maintain a good electron beam spot shape while also maintaining good convergence characteristics near the center and upper and lower ends of the phosphor screen. That is, the distance between the three color electron beam spots does not change depending on the vertical deflection.

However, when the electron beam is deflected to the left and right ends of the phosphor screen by a uniform horizontal deflection magnetic field, although the electron beam spot shape is maintained well, the distance between the three electron beams is the same as the center of the phosphor screen. It has been found that this is true only when the three electron beams are emitted from the electron gun almost parallel to each other. Therefore, in the patent, a delay is added to the video signals of the three colors so that the electron beams emitted in parallel appear to coincide on the phosphor screen.

However, in reality, it turned out to be extremely difficult to form a completely uniform magnetic field. It was also found that the video signal deteriorated due to the addition of a video delay circuit.

(An open point for the invention to solve) As mentioned above, in-line cathode ray tube devices have the problem that the shape of the electron beam deflected around the screen is distorted, which is a contributing factor to the deterioration of the resolution of color picture tubes. Therefore, the present invention aims to reduce the distortion of the deflected electron beam.
It is an object of the present invention to provide an in-line cathode ray Irf device with improved resolution.

[Structure of the invention]

(Means for Solving Problems) The present invention includes a vacuum envelope, a phosphor screen disposed inside the envelope, and irradiation of three electron beams at the center and on both sides toward the phosphor screen. and a deflection magnetic field generator that deflects the electron beam in the horizontal and vertical directions so that the electron beam impinges on a predetermined display area of the phosphor screen. It is something.

In the present invention, when the axis extending in the horizontal direction is the Y-axis, the axis extending in the vertical direction is the Y-axis, and the axis perpendicular to the fluorescent screen is the Z-axis, the horizontal tendency by the trend magnetic field generating device is calculated using the center of the phosphor screen as a base point. The magnetic field is almost symmetrical with respect to the plane containing the Y-axis and the Z-axis (Y-Z plane), and has a barrel-shaped horizontal main deflection magnetic field that mainly has a vertical component in the electron beam passage region, and Y@ and 2.
It has a horizontal auxiliary deflection magnetic field that is almost antisymmetric with respect to the plane containing the axis (Y-Z plane) and has a mainly vertical component in the electron beam passing region, and the vertical deflection magnetic field by the trend magnetic field generator is in the Y-axis. 7. A bottle cushion-shaped vertical main deflection magnetic field that is almost symmetrical with respect to a plane (X-Z plane) containing the and Z axis and has a mainly horizontal component in the electron beam passing region; It is almost antisymmetric with respect to the plane containing M (X-Z plane), and has a vertical auxiliary deflection magnetic field mainly having a horizontal component in the electron beam passing region. It is an object of the present invention to provide an image with little deterioration due to deflection even if the image is distorted at the periphery of the screen.

(effect) 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 barrel-shaped main horizontal deflection magnetic field (1) as shown in FIG.
) consists of an antisymmetrical horizontal auxiliary deflection magnetic field (2) and (3).

The positional relationship between the horizontal main deflection magnetic field strength and the horizontal auxiliary deflection magnetic field strength Iσ is distributed as shown in Figure 2 (a). The intensity peak position is closer to the electron gun.

Note that the position O on the horizontal axis in FIG. 2(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.

Generally, the magnetic field strength symmetric about the Y-Z plane is B = 8. +
B, X"+B, X'+・−−−=−・−(represented by υ,
In this equation (2), it is the secondary component H that affects the horizontal deflection magnetic field.

On the other hand, the strength of the magnetic field that is antisymmetric with respect to the Y-Z plane is B = I3. X+B,X"+BSX"+...
In this equation, it is the primary component B that affects the horizontal auxiliary deflection magnetic field. Against this background, the distribution of the horizontal main deflection magnetic field strength in Fig. 2 (n) is 8. Secondary component. The distribution of the horizontal auxiliary deflection magnetic field strength shows a first-order component of 81.

Figure 2(b) is a diagram showing the weighting function regarding the influence of the horizontal main deflection magnetic field and the horizontal auxiliary deflection magnetic field in Figure 2(a) on deuteron beam concentration (convergence) and beam spot shape.As shown in Figure 1. , the weight function (broken line) of the horizontal main deflection magnetic field is large on the phosphor screen side, and the lR function (solid line) of the auxiliary deflection magnetic field (solid line) is large 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 2(a) and the weighting function in Figure 2(b).
This situation is shown in FIG. 2(c).

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

The relationship between the positions of the vertical main deflection magnetic field and the vertical auxiliary deflection magnetic field in the present invention is also almost the same as that of the horizontal deflection magnetic field, and the expressions for the magnetic field need only be replaced with Y in the expressions (1) and (2).

Next, the state of the electron beam in the present invention will be sequentially explained.

If only the horizontal main deflection magnetic field is applied to the electron beam emitted from the electron gun, the electron beam will be deflected toward the flat end of the phosphor screen and will have a halo-like shape as shown in Figure (o). Only the vertically long core part 0 where the part disappeared becomes cursed.

Meanwhile, it was deflected to the vertical edge of the phosphor screen. The electron beam shape is number 3! As shown in A(b), a portion of the halo has disappeared and only the slightly elongated core portion ■ appears.

However, the concentration of the three electron beams becomes slightly overconcentrated. Figure 4 shows this situation, where the thick line frame represents the fluorescent screen (screen), the thin solid line represents the landing position of m beams (for example, the red light emitting beam) out of the 3 electron beams, and the thin broken line represents the landing position of m beams (for example, the red light emitting beam). 3f! Each represents the landing position of the other beam (for example, the beam for blue light emission) among the child beams.

The horizontal main deflection magnetic field and the vertical main deflection magnetic field specified in the present invention are shown in FIG. In other words, the main vertical deflection magnetic field has a bottle cushion shape with mainly horizontal components, and
It is a barrel-shaped horizontal main deflection field with a vertical component.

In such a magnetic field, the three electron beams undergo deflection and beam shape deformation as shown in FIG.

First, horizontal deflection will be explained. Since the horizontal main deflection magnetic field has a barrel shape, the electron beams in the deflection magnetic field receive a force to be deflected to the right in Figure 6(a). In both cases, the force acting in the vertical direction becomes vertically elongated. Also, since the horizontal deflection magnetic field is barrel-shaped, the field strength becomes weaker as you move away from the center of the deflection magnetic field, and the blue phosphor-emitting electron beam (6B) is stronger than the red phosphor-emitting electron beam (6R).
) is stronger and receives a force directed to the right. Therefore, in the case of horizontal deflection, the electron beam spot becomes vertically elongated at the horizontal end, and 3
The color electron beams are in a state of overconvergence where they are concentrated at the phosphor screen 11.

Vertical deflection will be explained. Since the vertical deflection magnetic field has a pincushion shape, the electron beam in the deflection magnetic field receives the upward deflection force shown in FIG. 6(b), and since the vertical deflection magnetic field has a pincushion shape, each For both electron beams, the beam that receives the force acting in the left and right directions becomes vertically elongated.

Also, since the vertical deflection magnetic field is a bottle cushion magnetic field,
The double-sided electron beam experiences a force acting toward the vertical axis. Therefore, in the case of vertical deflection, the electron beam spot becomes vertically elongated at the vertical edge of the screen, and the three-color electron beam is concentrated in front of the screen, resulting in an overconvergence state.

Next, a case will be described in which the horizontal auxiliary deflection magnetic field and the vertical auxiliary deflection magnetic field of the present invention are applied in such a state.

In the case of horizontal deflection, as shown in FIG. 7, the electron beams on both sides receive forces in the direction of separating them from each other. Therefore, the convergence error shown in FIG. 4 can be corrected. In other words, the electron beams on both sides, which were previously subjected to a force in the direction of separating from each other by the horizontal auxiliary deflection magnetic field, receive a force to approach each other by the barrel magnetic field of the horizontal main deflection magnetic field, and the main deflection magnetic field and the auxiliary deflection are optimally When the magnetic field strength is adjusted, three electron beams are concentrated on the screen of the color picture tube, and an image without color shift can be seen as shown in FIGS.

When deflected horizontally, the beam spot shape is as follows:
As shown in Figure 8(a), first, the soil receives a force that becomes horizontally elongated mainly due to the horizontal auxiliary deflection magnetic field.First, as shown in Figure 8(b), the soil receives a force that becomes vertically elongated due to the horizontal main deflection magnetic field. . The force that makes it vertically elongated is weaker than the force that makes it horizontally elongated due to the horizontal auxiliary deflection magnetic field, so on the phosphor screen of a color picture tube, a part of the habo halo becomes slightly elongated as shown in Figure 8(c). An electron beam spot consisting of a small core portion of the electron beam can be obtained.

When the vertical auxiliary deflection magnetic field is applied, as in the case of the horizontal auxiliary deflection magnetic field, as shown in FIG. 7, the electron beams on both sides are subjected to a force in a direction away from each other. Therefore, the color shift of the electron beams on both sides during vertical deflection in Fig. 4 can be corrected, and the
An image without color shift, as shown in the figure, can be obtained.

When deflected vertically, the beam spot shape is
As shown in FIG. 10(a), first, j:, receives a horizontally elongated force from the vertical auxiliary deflection magnetic field, and then
As shown in Figure (b), the vertical main deflection magnetic field receives a force that makes it vertically elongated. In the case of vertical deflection, the force that causes the vertically elongate and the force that causes the horizontally elongate are approximately equal, so on the phosphor screen of a color picture tube, as shown in Figure 10(c), the electron An electron beam spot consisting of a beam core is obtained.

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

FIG. 12 is a schematic sectional view of the color picture tube device of the present invention. The panel ■, the funnel ■, and the neck (10) form an envelope, and red-emitting phosphor dots, green-emitting phosphor dots, and blue-emitting phosphor dots are regularly deposited on the inner surface of the panel ■. A fluorescent screen (11) is formed. Inside the neck (10), there are three electron beams (B) (G) () at the center and on both sides facing the fluorescent screen (11).
It has a built-in in-line electron gun (13) that irradiates the electron beam (B) (G) (R) (R) is a funnel (■). It is deflected and hits the display area of the phosphor screen (11). Panel ■The inside has a fluorescent screen (11)
A shadow mask (12) is placed facing each other in the vicinity of the shadow mask (12).
It is designed to strike a predetermined position on the color phosphor.

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

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

In a preferred embodiment, the horizontal main deflection magnetic field is formed by a coil (17) wound in a saddle shape on the inner surface of the separator (16), and the horizontal auxiliary deflection magnetic field is formed by a ferrite core (14), as shown in FIG. ) wrapped around a toroidal coil (
1B-1). The main vertical deflection magnetic field is a toroidal coil (15) wound around a ferrite core (14).
Similarly to the horizontal auxiliary deflection magnetic field, the vertical auxiliary deflection magnetic field is formed by a toroidal coil (18-2) wound around a ferrite core (14).

Figure 13(a) shows the ferrite core (
14) and an enlarged view of the toroidal coil (18-1), and FIG. 13(b) is a diagram showing the relationship between the current flowing through the toroidal coil shown in FIG. 13(a) and time.

A similar configuration of the vertical auxiliary deflection field can be used. Note that FIG. 13 shows one vertical main deflection coil (15) (not shown). In a preferred embodiment, a toroidal coil forming a horizontal auxiliary deflection magnetic field and a vertical auxiliary deflection magnetic field is superimposed on the ferrite core (14). 13(b)
It is sufficient to flow a current with the characteristics shown in . Or the 13th
The 14th toroidal coil (18-1) shown in the figure (,)
A current having the characteristics shown in the figure may be passed.

The superimposed main deflection coil, horizontal main deflection coil, vertical auxiliary deflection coil and horizontal auxiliary deflection coil are combined with each other, adjusted and then mounted on the outside of the color picture tube using a wedge (19).

Due to the structure described above, even if the electron beam emitted from the electron gun is deflected by a predetermined amount by the vertical deflection magnetic field and the horizontal deflection magnetic field, the distortion of the electron beam is small due to the various effects described above, and color image reception with good resolution is achieved. A 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. 15 or FIG.
A current as shown in Fig. 17 may be passed through the coil shown in Fig. 6.

Further, the auxiliary deflection magnetic field may be formed by a saddle coil shown in FIG. The current shown in Fig. 17 can be passed through the coil shown in Fig. 18. When the current shown in Fig. 17 is passed through the coils shown in Figs. However, the formed magnetic field becomes a magnetic field obtained by perpendicularly combining (a) the main deflection magnetic field and (b) the auxiliary deflection magnetic field in FIG.

Even in such a case, it is possible to independently form the magnetic field shapes and/or magnetic field strengths of the main deflection magnetic field and (b) the auxiliary deflection magnetic field depending on the shape of the coil or the current flowing through the coil.

The shape of the magnetic field corrector is shown in Figure 19 (a) and Figure 19 (b).
It may also be as shown in

Furthermore, although the relationship between the main deflection magnetic field and the auxiliary deflection magnetic field has been explained in detail mainly for the horizontal deflection magnetic field, when used in the vertical deflection magnetic field, a coil having an arrangement rotated by 90 degrees around the Z-axis from the above explanatory diagram is used. You can use .

〔Effect of the invention〕

As described below, 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 the drawing]

FIG. 1 is a diagram showing the general shape of the horizontal deflection magnetic field according to the present invention, FIG. 2 is a diagram showing the relationship between the horizontal main deflection magnetic field and the horizontal auxiliary deflection magnetic field according to the present invention, and FIG. Diagrams showing deflected electron beam spot shapes, Figures 4 and 9
Figures 11 and 11 are diagrams showing the concentration state of three electron beams,
FIG. 5 is a diagram showing the shapes of the horizontal main deflection magnetic field and the vertical main deflection magnetic field according to the present invention, FIG. 6 is a diagram illustrating the effects of the horizontal main deflection magnetic field and the vertical deflection magnetic field on the electron beam, and FIG. Figure 8 is a diagram illustrating the effects of the horizontal auxiliary deflection magnetic field and superimposed auxiliary deflection magnetic field on the electron beam. Figure 10 is a diagram illustrating the effect of the horizontally deflected electron beam. FIG. 12 is a schematic cross-sectional view of the color picture tube device of the present invention, and FIGS. 13, 15, 16, and 18 illustrate the shape of the deflection magnetic field forming coil according to the present invention. Figure shown, 1st
4 and 17 are characteristic diagrams of the current flowing through the coil according to the present invention, FIG. 19 is a diagram showing the magnetic field corrector [w8], and FIG. 20 is a diagram showing the shape of an electron beam deflected in a conventional color picture tube device. It is. ■... Horizontal main deflection magnetic field shape ■, ■... Horizontal auxiliary deflection magnetic field shape (c)... Panel (9)... Funnel (lO)... Neck (11)... Fluorescent screen ( 13)...Electronic gun agent Patent attorney Nori Chika 0] Takehana Kikuo' ＼--,/g Figure 2 Figure 8 Figure 8 Figure 9 (α) (1!:+)
(C) Figure 1O Figure 11'a t4F! ! :J Fig. 15 * 1 @ Fig. Yl * Division; Right side coils, LT electric wire: Left half coil 1 (2 Current consumed - m Fig. 17 <o-> 1st g ( cL) (b) Momme (b) Figure

Claims (1)

[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 A color picture tube device comprising a deflection magnetic field generator that deflects an electron beam horizontally and vertically so as to impinge on a predetermined display area of the phosphor screen, wherein an axis extending horizontally from the center of the phosphor screen as a base point. When the axis extending in the vertical direction is the X axis, the axis extending in the vertical direction is the Y axis, and the axis perpendicular to the fluorescent screen is the Z axis, the horizontal trending magnetic field generated by the trending magnetic field generator is a plane containing the Y axis and the Z axis (Y-Z plane) A barrel-shaped horizontal main deflection magnetic field that is almost symmetrical to the electron beam and has a mainly vertical component in the electron beam passing region, and
and a horizontal auxiliary deflection magnetic field that is almost antisymmetric with respect to the plane) and has a mainly vertical component in the electron beam passing region, and the vertical deflection magnetic field by the trend magnetic field generator has an X-axis and a Z-axis.
A pincushion-shaped vertical main deflection magnetic field that is almost symmetrical with respect to the plane containing the axis (X-Z plane) and has a mainly horizontal component in the electron beam passing region, and a plane containing the X and Z axes (X-Z plane). - a vertical auxiliary deflection magnetic field that is substantially antisymmetric with respect to the Z plane) and has a mainly horizontal component in an electron beam passing region.