JPH01267939A - Color image receiving tube device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention relates to a color picture tube device, and in particular, to a color picture tube device, in which three electron beams arranged in-line are connected to a common large-diameter tube for these electron beams. The present invention relates to a color picture tube device having an electron gun focused and concentrated by an electron lens.

(Prior Art) A horizontal cross section of a general color picture tube device is shown in FIG.

In the figure, a color picture tube device 1 has a screen surface 2.
and this face plate 3.
A neck 5 connected to the side wall 3a of the
an electron gun 6 built into the neck 5; a deflection device 7 mounted on the outer wall from the funnel 4 to the neck 5; and a shadow having a large number of apertures 8 facing the screen surface 2 at predetermined intervals a mask 9; an internal conductive film 10 uniformly applied from the inner wall of the funnel 4 to a part of the neck 5; an external conductive film 11 applied to the outside of the funnel 4; and an anode terminal (not shown).

The screen surface 2 is coated with a large number of red-emitting phosphors, green-emitting phosphors, and blue-emitting phosphors in the form of stripes or dots, and the three electron beams BR, BG, and BB emitted from the electron gun 6 are is selected by the shadow mask 9 and impacts each phosphor, causing it to emit light.

The electron gun 6 also includes an electron beam forming section GE for generating, accelerating, and controlling three parallel electron beams BR, BG, and BB arranged in-line, and a main electron beam forming section GE for converging and concentrating these electron beams. Lens part ML is on the right. And three electron beams 31? , 3G and BB are deflected and scanned over the entire screen by the deflection device 7 to form a raster.

3 The method of concentrating the electron beam is described, for example, in U.S. Patent No.
As shown in the specification of US Pat. No. 957,106, there is a technique of tilting and concentrating the electron beam emitted from the cathode from the beginning, and as shown in US Pat. Among the three electron beam passage apertures provided, there is a technique in which the electron beams are concentrated by making the apertures on both sides of the electrode slightly eccentric to the outside from the central axis of the electron gun. is also widely adopted.

The deflection device basically consists of a horizontal deflection coil for generating a horizontal deflection magnetic field that deflects the electron beam in the horizontal direction, and a vertical deflection coil for generating the vertical deflection magnetic field that deflects the electron beam in the vertical direction. have. In an actual color picture tube device, when the electron beams are deflected, the concentration of the three electron beam spots on the face plate breaks down, so measures are taken to prevent this break in concentration. This is called a convergence-free system, and by making the horizontal deflection magnetic field into a vincsion type and the vertical deflection magnetic field into a barrel shape, three electron beams are concentrated over the entire area of the self-concentrating magnetic field phosphor screen. be.

As mentioned above, the quality of color picture tubes has been improved through the adoption of many developed technologies, but as tubes become larger and higher in quality, new problems are coming to the fore.

Namely, there are (1) a problem with the spot diameter of the electron beam on the screen, (2) a problem with the distortion of the electron beam spot at the periphery of the screen when it is deflected, and (2) a problem with convergence over the entire surface of the screen.

When the tube becomes larger, the distance from the electron gun to the screen surface increases, and the electron optical magnification of the electron lens increases, increasing the spot diameter on the screen and degrading the resolution. In order to reduce the spot diameter, the performance of the electron lens in the electron gun must be improved.

Generally, the main electron lens portion is formed by coaxially disposing a plurality of electrodes each having an opening and applying a predetermined potential to each electrode. There are several types of such electrostatic lenses depending on the electrode configuration, but basically they are formed by forming a large diameter lens with a large aperture between the electrodes, or by increasing the distance between the electrodes and creating a gentle potential. Lens performance can be improved by changing the focal length to form a long focal length lens.

However, since the electron gun of a color picture tube is generally enclosed in a neck which is a thin glass cylinder, the aperture of the electrode, that is, the diameter of the lens is limited to a uniform thickness. Also, the distance between the electrodes is limited so that the focused electric field formed between the electrodes is not influenced by other undesired electric fields in the neck.

In particular, when three electron guns are integrated in a delta array or inline array, such as in a shadow mask type color picture tube, the smaller the electron beam spacing (Sg) is, the more the three electron beams can be screened. Since it is easy to concentrate at one point near the entire surface and the deflection power is small, the opening of the electrode has to be made even smaller in order to reduce the distance between the electron guns.

Therefore, a method can be considered in which three electron lenses arranged on the same plane are completely overlapped to form one large electron lens, and this large-diameter electron lens is used to maximize the electron lens performance. FIG. 12 shows this optically. As shown in the figure, the core of the projected electron beam becomes smaller, but the result is still insufficient in terms of the electron beam itself. That is, three parallel electron beams (BR), (BG), (813>
When passing through one common large-diameter electron lens LEL, when the central electron beam (B, G) is properly focused as shown in FIG. 12, the electron beams on both sides (BR) are formed.

(B8) is in an overfocused state and overconcentrated state, and on the screen (101) with large coma aberration, 3
Book beam spot (SPR>).

(SPG >, (SP[3)) is far apart and the beams on both sides are distorted.

In order to match the convergence state of these three electron beams and reduce the coma aberration, the distance Sg between the three beams with respect to the lens aperture of the electron lens L E L must be reduced to a certain extent. However, with regard to the concentration of the three beams on the screen, Sg must be made extremely small, and there is a limit in terms of the mechanical arrangement of the electron beam generator.

Therefore, Japanese Patent Publication No. 49-5591 (U.S. Patent Box 3,
448.316) and U.S. Pat. No. 4.528.4
In the specification of No. 76, as shown in FIG.
The three incident electron beams are given an inclination angle θ in advance so that the three electron beams pass through the center of the electron lens LEL at the same time, so that the three beams are focused, and then diverged. The beams on both sides are passed through the second lens L.
The beams are strongly directed (φ°) in the opposite direction by EL2 so that the three beams are concentrated on the screen. As a result, the focusing and concentration of the three electron beams is improved. However, the problem remains that large deflection aberrations or coma aberrations occur in the beams on both sides.

As described above, it is difficult to use a large-diameter electron lens that works commonly for three electron beams, and the performance of the large-diameter electron lens cannot be maximized.

(Problem to be Solved by the Invention) As described above, in order to further improve the image performance of the color picture tube device, the performance of the electron gun is improved by using a large diameter electron lens common to the three electron beams. Although it is effective to reduce the diameter of the beam spot on the screen surface, conventional technology cannot fully demonstrate the performance of large-diameter electron lenses, and it is difficult to further improve the image performance of color picture tube devices. Problems that are difficult are rare.

Therefore, in order to further improve the image performance of a color picture tube device, it is desirable to have 1q color picture tube devices equipped with an electron gun that can fully utilize the performance of a large-diameter electron lens.

The present invention has been made to solve the problems of the prior art, and is an electron gun that can simultaneously and easily focus each electron beam using a large-diameter electron lens common to three electron beams. Therefore, it is an object of the present invention to provide a color picture tube device equipped with an electron gun that can fully demonstrate the performance of this large-diameter electron lens.

[Structure of the Invention] (Means for Solving the Problems) That is, the color picture tube device of the present invention includes an in-line electron gun section, a deflection section, and a screen section, and deflects an electron beam emitted from the electron gun. In a color image receiving device that internally performs deflection scanning in the vertical and horizontal directions, the electron gun section includes an electron beam forming section that generates, accelerates, and controls three electron beams, and a main electron beam that focuses and concentrates the electron beams. The main electron lens section has a large-diameter asymmetric electron lens that acts on the three electron beams in common, and this asymmetric electron lens has a horizontal direction that acts on each of the three electron beams. The convergence force is weaker than the vertical convergence force, and the 3 electrons incident on this asymmetric electron lens
This color picture tube device is characterized in that the electron beam axes of the book are parallel to each other, and each electron beam is a beam that diverges more strongly in the vertical direction than in the horizontal direction.

Each electron beam incident on the asymmetric electron lens is
This does not mean that the beam is divergent in the horizontal direction. This also includes the case of beams that are focused in the horizontal direction.

The present invention also provides a color picture tube device comprising an in-line electron gun section, a deflection section, and a screen section, in which the electron beam emitted from the electron gun is deflected and scanned in vertical and horizontal directions by the deflection section. The section includes an electron beam forming section that generates, accelerates, and controls three electron beams;
The main electron lens section includes a main electron lens section that converges and concentrates the electron beam, and the main electron lens section has a large-diameter asymmetric electron lens that acts in common on the three electron beams. It has a cylindrical electron lens that is common to the main electron beams, and a non-circular beam passage aperture that is located within the lens area of the cylindrical electron lens and allows the three electron beams to pass through in common. This color picture tube device is characterized in that it has a beam forming means that produces a beam that diverges more strongly in the vertical direction than in the horizontal direction.

(Function) In the present invention, the beam axes of the three electron beams incident on the main electron lens of the electron gun are mutually parallel, and each electron beam is designed to diverge more strongly in the vertical direction than in the horizontal direction. has been done.

The wrestler's electronic lens section has a large diameter asymmetrical electron lens that acts on three electron beams in common. Designed to be weak.

When an electron beam as specified above is incident on such a large-diameter asymmetric electron lens section, the incident beam is subjected to a large-diameter asymmetric electron beam effect, and the three electron beams projected on the screen are well concentrated. The individual electron beams are small in diameter and undistorted. Moreover, since the three electron beams pass through a large-diameter lens, the advantages of a large-diameter lens can be maximized.

In the present invention, the most preferable concentration and focusing characteristics can be obtained when the individual electron beams incident on the main electron lens do not spread in the horizontal direction, that is, are substantially parallel.

For comparison with the present invention, the individual electron beams incident on the main electron lens are made almost parallel in both the horizontal and vertical directions, and the other conditions are the same as those of the present invention. .

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a cross section along the x-7 plane of a part of the screen near the neck of a color picture tube device embodying the present invention, and FIG. 2 shows a cross section along the Y-7 plane of only the electron gun section. .

In FIGS. 1 and 2, the electron gun section (100) disposed inside the neck (5) has a cathode (cathode) K, a first
Grid Gl, second grid G2, third grid G
3. 4th grid G4. Fifth grid G5, sixth grid G6. It consists of a seventh grid G1, an insulating support BG supporting them, and a pulp spacer (112), and an electron gun (100) is fixed to a stem bin (113) at the bottom of the neck.

Each of the cathodes has a heater inside and generates three electron beams BR, BG, and BB.

Further, the first grid G1 and the second grid G2 are
It has three relatively small beam passing holes corresponding to each cathode K, and this part controls and accelerates the electron beam from the cathode K, forming a so-called electron beam forming part GE. Next, the third grid G3. 4th Grid G4
, the fifth grid G5 also has three relatively large beam passage holes corresponding to the three cathodes K.

On the sixth grid G6 side of the fifth grid G5, four electrodes (20
> , (21> , (22> , (23)
has three beam passing holes (52R), (52G>, (52
The sixth grid C6 has two electrodes (24) and (25) parallel to the inline arrangement direction on the fifth grid G5 side, and three beam passing holes (6).
1R), (61G), and (61B), and four electrodes (20) on the fifth grid G5 side.

(21), (22), (23) and the two electrodes (24), (25) on the sixth grid G6 side are arranged so as to overlap each other, and between the fifth grid G5 and the sixth grid 06. When voltage is applied, the fifth grid G
A quadrupole lens is formed between the four electrode plates of grid G6 and the two electrode plates of grid G6.

In addition, there is a fifth grid on the fifth grid G5 side of the sixth grid G6.
Beam passage hole (52R) of grid G5.

There are three beam passing holes (61R), (61G), and (61B> of the same size as (52G> and (52B>), and one large circular beam hole is installed on the 7th grid GI side. It is a substantially cylindrical electrode provided with a passage hole (62).Inside this cylindrical electrode, in the middle part in the longitudinal direction, there is a track field shape having a major axis in the inline arrangement direction (X direction). An electrode (60) having a beam passage hole (63) is arranged.

This beam passage hole (63) is located at the seventh grid of the sixth grid G6.
It is located at a predetermined distance a from the grid side end (with respect to the diameter D6 of the large circular beam passage hole (62),
<[) There is a relationship of 6.

The seventh grid G7 partially overlaps with the sixth grid G6,
It is a substantially cylindrical electrode that includes a sixth grid G6, which is a cylindrical electrode, and substantially forms a large diameter cylindrical lens between it and the large circular beam passage hole (62) of the sixth grid G6.

Inside the cylindrical electrode of the seventh grid G7, a track field having a short diameter in the inline arrangement direction (X direction) at a predetermined distance away from the end of the sixth grid toward the screen part (2) side. Shaped beam passage hole (73)
An electrode (70) having a diameter D7 of the seventh grid G7 has a relationship of b<[)7.

Further, in this embodiment, a>b.

Figure 7 shows electrodes (60) and (70).

A valve spacer (1
12), which is in contact with the conductive film (10) coated from the inner wall of the funnel (4) to the inner wall of the neck (5), and is configured to supply an anode high voltage from the anode terminal provided on the funnel. It has become.

A magnetic field modifying element for the magnetic field produced by the deflection yoke can also be placed at the tip of the seventh grid G1.

The above cathodes are connected to the first grid G1 to the seventh grid G.
7 are fixedly supported by the insulating support BG.

In addition, a deflection yoke (7) is attached from the neck (5) to the funnel (4), and the deflection yoke (7) is connected to the funnel (4).
It consists of a horizontal deflection coil and a vertical deflection coil for deflecting the book's electron beams BR, BG, and BB horizontally and vertically. Furthermore, a multipolar magnet (51) is arranged for adjusting the trajectory of the beam.

In the electron gun, a predetermined voltage is applied from the outside to all electrodes except for the seventh grid G7 through stem pins (113).

In the above electrode configuration, for example, the cathode has about 15
The cutoff voltage is set to 0V, the video signal is added to this, the first grid G1 is set to ground potential, and the second grid G2 is set to 5V.
00V to 1 kV, third grid G3 5 to 10 kV,
4th grid G4 is 500-3kV, 5th grid G5
is 5 to 10 kV, 6th grid G6 is 5th grid G5
Slightly higher, 5-10 kV, the seventh grid G7 applies an anode high voltage of 25-35 kV.

By having such a potential configuration, each cathode K
The beam generated according to the modulated signal forms a crossover CO at the cathode with the first grid G1° and the second grid G2 as shown in Figs. Slightly focused by pre-focus lens PL by G3, virtual crossover ■C
0 and enters the third grid G3 while diverging. Each of the beams BR, BG, and BB that have entered the third grid G3 are focused in the main electron lens section ML1 by the third grid G3 to the seventh grid G7, and the beams on both sides are focused on the screen (2). Concentrate on. Figure 3.

FIG. 4 is an iso-optical model corresponding to FIGS. 1 and 2, respectively.

The lens action of the main electron lens sections from the third grid G3 to the seventh grid G7 will be explained in more detail using equivalent optical models shown in FIGS. 3 and 4.

The individual electron beams that formed the virtual crossover ■CO and entered the third grid G3 are transferred to the third grid G3. 4th grid G4. They are each slightly focused by individual weak unipotential lenses EL2 (second electron lenses) formed by the fifth grid G5.

Now, as mentioned above, the fifth grid G5 has four electrodes (2
0)(21)(22)(23) are arranged, and the sixth grid G6 has two electrodes (24) and (25) arranged in a direction parallel to the inline arrangement direction, so the fifth grid When a voltage is applied between grid G5 and sixth grid G6, a quadrupole lens QEL is formed between these electrodes. Therefore, the electron beam incident here is subjected to a lens effect and travels toward the large-diameter electron lens LEL so as to diverge more strongly in the vertical direction than in the horizontal direction. Quadrupole lens QEL
The strength of the above-mentioned divergence force should be adjusted depending on the distortion and concentration of the electron beam projected on the screen.
The individual dimensions and relative spacing of (24) and (25) are appropriately selected.

In the present invention, the electron beam emitted from the quadrupole lens QEL diverges in the vertical direction and becomes a nearly parallel beam in the horizontal direction. The electron beam that is subjected to the lens action and finally projected onto the screen exhibits good concentration and focusing characteristics.

This point will be explained in detail using FIGS. 1 and 5.

It can be viewed as one large-diameter electron lens LEL.

That is, since there is a horizontally elongated beam passage hole (63) inside the cylindrical electrode of the sixth grid G6, the high voltage electric field penetrating from the seventh grid is distorted by the beam passage hole (63) and is distorted in the horizontal direction (X direction). has a weak focusing force in the vertical direction (
The front-stage focusing lens C exerts a strong focusing force in the Y direction).
This means that L can be done.

On the other hand, the inside of the cylindrical electrode of the seventh grid G7 is vertically distorted by (73), and the subsequent diverging lens has a strong divergent force in the horizontal direction (X direction) and a weak divergent force in the vertical direction (Y direction). DL will be available.

The large-diameter electron lens LEL as a whole is designed to have weak focusing in the horizontal direction (X direction) and strong focusing in the vertical direction (Y direction).

That is, a common large aperture asymmetric lens is formed.

Here, the concentration and focusing characteristics of the embodiment will be explained.

Since the axes of the three electron beams incident on the common large-diameter lens LEL are parallel to each other, the large-diameter lens LEL
receives a weak horizontal focusing force and focuses well on the screen.

This is a common large-diameter lens LEL as shown in Fig. 12.
If the horizontal focusing force of is strong, 3
This is in contrast to overconcentration of the beam.

The focusing characteristics of an electron beam will be explained.

The electron beam passing through the quadrupole lens QEL receives a slight convergence effect in the horizontal direction while passing through the quadrupole lens QEL, and a divergence effect in the vertical direction. And large aperture lens L
In EL, the beam is focused, albeit weakly, in the horizontal direction, and strongly focused in the vertical direction, resulting in a well-focused beam on the screen.

The individual weak unipotential lenses EL2 (second electron lenses) formed between G3 and G4.05 shown in this example are used to adjust the beam diameter of the beam incident on the large-diameter electron lens section LEL and the main electron lens section MLI. This is to adjust the focusing state as a body, and in the present invention, an asymmetric lens provided outside the lens area of the large-diameter electron lens is used as the lens EL.
It can also be provided in two parts.

The second one has a weak focusing effect to simplify the explanation.
If we ignore the electron lens EL2 of
Since the beams are focused so as to be substantially parallel to each beam axis in the horizontal direction, the virtual crossover point V COl-1 in the horizontal direction moves backward to infinity from the cathode.

Therefore, the three parallel electron beams arranged in-line are concentrated on the screen by the large-diameter electron lens LEL, and each beam is converged on the screen. In other words, in the horizontal direction, the focus of the large-diameter electron lens on the image point side is on the screen.

However, in reality, the strength of QEL and the strength of I-EL need to be adjusted due to the spherical aberration of the lens and the emittance of the beam emitted from the cathode.

On the other hand, in the vertical direction, the asymmetric lens QFL section diverges (or weakly focuses), so the virtual crossover point vcov in the vertical direction is located much closer to the screen than vColl in the horizontal direction, and has a large aperture. Each beam is focused on the screen by being strongly focused by the electron lens LEL.

Therefore, the three electron beams arranged in-line are concentrated and each beam is focused roundly onto the screen.

The detailed specifications of the embodiment are as follows, for example.

Cathode spacing Sg = 4.92 m Opening diameter of each electrode G1φ, G2φ = 0.62sG3φ, G4φ, G5φ,
G6Bφ = 4.52 Willow GETφ = DB = 25.0m G7φ = D7 = 28.0m Length of each electrode G3 = 6.2M G4 = 2.0m G5 = 35.4in G6 = 30.0m Electrode (20) ~ (23) = /1rtvn electrode (2
4>, (25) = 4rM1 Spacing between each electrode Gl/G2 = 0.351Ml G2/G3 = 1.2m G3/G4. G4/G5 = 0.6ma = 11.0# b = 6.0m In the above example, the lens form is such that a strong divergence force is obtained in the horizontal direction at the rear stage of the large-diameter electron lens LEL. As shown in Figure 6, the distance SO at the deflection center plane of the three electron beams that exit the electron lens and concentrate on the screen is compared to the distance SD' when they are simply concentrated (dotted line in the figure). This makes it possible to reduce the concentration error when the three beams are deflected over the entire surface of the screen, and to reduce the deflection power, thereby providing a high-resolution, high-quality color picture tube device. be able to.

In addition, in the above embodiment, when the deflection yoke is used as a converter free magnetic field, the beam distortion due to the deflection magnetic field is severe, so the fifth grid G is synchronized with the horizontal and vertical deflection.
If the voltage of 5 is made variable, the asymmetric lens Q
The lens power of the EL can be changed to cancel out the above deflection distortion, or the deflection magnetic field can be made uniform to eliminate beam distortion caused by the deflection magnetic field, and convergence can adjust the mutual relationship between the video signal and the deflection current. You can also do it by doing this.

In the above embodiment, a pi-potential type cylindrical lens is used as the common large-diameter asymmetric lens as a basic type, and a horizontally elongated beam passing hole (48) is provided at the distance of the front part a, and a vertically elongated beam passing hole (50) is provided at the distance of one step part a. ), and by setting a > b, the horizontal divergence effect of the rear section is strengthened. However, the present invention is not limited to this, and the present invention is not limited to this. Asymmetric lenses can be formed and
For example, it is also possible to eliminate the horizontally elongated beam passage hole in the front section. Of course, the non-circular beam passage hole can be appropriately modified as long as it is made of a large-diameter asymmetric lens with stronger focusing power than in the vertical or horizontal direction.

It goes without saying that in addition to the pi-potential type cylindrical lens, a uni-potential type lens, an extended electric field type lens, etc. can also be used.

In addition, in the embodiment, the common large-diameter asymmetric lens LEL
An asymmetric lens QEL is installed between the fifth grid G5 and the sixth grid G6 in order to make each of the three independent electron beams incident on the electron beam substantially parallel in the horizontal cross section and divergent in the vertical parallel cross section. However, the present invention is not limited to this, and as described above, an asymmetric lens can be made in the fourth grid section 04, or an asymmetric lens can be made in the electron beam forming section, and the horizontal cross section of each electron beam can be It can also be a substantially parallel beam.

Other embodiments of the invention are shown below.

8 and 9 are X-7 cross sections and Y-Z cross sections corresponding to FIGS. 1 and 2, and the same parts are indicated by the same numbers.

In FIGS. 8 and 9, at the tip of the fifth grid G5, there are two electrode plates (53) and (54) above and below the three beam passage ports (52R) to (528). Similarly, on the 5th grid side of the 51st grid G51, there are two electrode plates (511) and (512) above and below the three beam passage ports (511R) to (511B). On the 6-grid G6 side, there are 4 electrode plates (513) (514) (515) (516) in the vertical direction.
Similarly, on the 51st grid side of the 6th grid G6, four electrode plates (612) (613) (
614) (615) There are 7.

The sixth grid G6 and the seventh grid G7 are based on large-diameter cylindrical lenses and include non-circular beam passage openings (63) and (73), as in the previous embodiment.

5th grid G5, 51st grid G51. 6th Grid G6. When a gradually higher potential is supplied to the seventh grid G7, a parallel plate lens FLv having a focusing action only in the vertical direction is formed between the opposing electrode plates of the fifth grid G5 and the 51st grid G51 (there is nothing in the horizontal direction). 51st Grid G51 and 6th Grid G6
A parallel plate lens FLH having a focusing action only in the horizontal direction is formed between the opposing electrode plates (no force acts in the vertical direction).

At this time, the lens F L H is designed to focus more strongly than the lens FLV, so that the beams from the electron beam forming section are strongly focused in the horizontal direction, becoming approximately parallel beams, and slightly focused in the vertical direction. The beam enters the common large-diameter asymmetric lens portion LEL while still being a divergent beam, and as in the previous embodiment, the large-diameter lens portion
The book's beam focuses and concentrates onto the screen.

In this embodiment, the voltage supplied to the fifth grid G5 is connected to the horizontal and vertical deflection currents H and V to the deflection yoke (7).
A dynamic correction circuit (72) is connected externally so as to vary in a parabolic manner in synchronization with the above.

Therefore, when the horizontal deflection magnetic field produced by the deflection yoke is a strong binkushing magnetic field, when the electron beam is deflected to the periphery of the screen as shown in Figure 10, it becomes strongly overfocused in the vertical direction due to the binkushing magnetic field. The focusing of the electron lens FLV becomes weaker and becomes insufficiently focused in the vertical cross-sectional direction, so that it is corrected by the deflection distortion force 91 and becomes a round beam.

The present invention attempts to improve lens performance by arranging a common large-diameter electron lens for three independent electron beams in the main electron lens section.
At this time, in order to simultaneously satisfy the convergence and concentration of the three electron beams, the common large-diameter electron lens is an asymmetric lens with a weaker focusing power than that in the horizontal or vertical direction. The three electron beams each form a substantially parallel beam in the horizontal direction and a diverging beam in the vertical direction, and the common large-diameter asymmetric electron lens mentioned above is, for example, composed of three independent electron beams emitted from an electron beam forming section. A cylindrical electron lens that is common to the three electron beams, and a non-circular beam passing hole that is located within the lens area of the cylindrical electron lens and that allows the three electron beams to pass through in common on at least one of the cathode side and the screen part side. In addition, outside the lens area of this cylindrical electron lens, an asymmetrical electron lens is arranged on the cathode side that is independent of the three electron beams, and this electron lens allows By focusing strongly in the horizontal direction, a beam that is substantially parallel to the horizontal direction is created.

Furthermore, the non-circular beam passing hole located within the lens area of the cylindrical electron lens is substantially longer in the horizontal direction than the vertical direction of the non-circular beam passing hole disposed on the cathode side, and the non-circular beam passing hole disposed on the screen side. The beam passage hole is substantially shorter in the horizontal direction than in the vertical direction.

Furthermore, an asymmetric electron lens located outside the cylindrical electron lens area and independent of the three electron beams on the cathode side is configured to vary the strength of the electron lens according to the amount of deflection by the deflection section. A means can also be provided.

[Effects of the Invention] As described above, according to the color picture tube device of the present invention, the performance of the common large-diameter electron lens is fully exhibited, and the parallel three-dimensional electron beam generated from the cathode by the common large-diameter electron lens is The book's electron beams can be focused onto the screen surface with optimal focus and concentration, respectively.

Therefore, a very small beam spot can be realized on the screen surface, and a color picture tube device with improved image performance can be used.

[Brief explanation of the drawing]

FIG. 1 shows the main parts of a color picture tube device in which the present invention is implemented.
7 is a sectional view, FIG. 2 is a YZ sectional view of the main part of a color picture tube device embodying the present invention, FIGS. 3 and 4 are optical equivalent views corresponding to FIGS. 1 and 2, Figures 5 and 6
The figures are diagrams explaining the large-diameter electron lens of the present invention, FIG. 7 is a diagram showing electrodes for forming the large-diameter asymmetric lens of the present invention, and FIGS. 10 is a diagram showing the electron beam shapes of the present invention and the conventional example. FIG. 11 is a schematic sectional view of a general color picture tube device, and FIGS. 12 and 13. is an explanatory diagram of the prior art. 1... Color picture tube device diagram 100... Electron gun section 7... Deflection device 2... Screen GE... Electron beam forming section MLI... Main electron lens section QEL... Asymmetric lens LEL ...Common large aperture lens agent Patent attorney Nori Chika Yudo Kikuo Takehana Figure 6 Figure 8 Figure 9 Figure 10

Claims (2)

[Claims] (1) In a color picture tube device comprising an in-line electron gun section, a deflection section, and a screen section, the electron beam emitted from the electron gun is deflected and scanned in vertical and horizontal directions by the deflection section, wherein the electron gun section is equipped with an electron beam forming section that generates, accelerates, and controls three electron beams, and a main electron lens section that focuses and concentrates the electron beams.
This main electron lens section has a large-diameter asymmetric electron lens that acts commonly on the three electron beams, and this asymmetric electron lens has a horizontal convergence force that acts on each of the three electron beams. The axes of the three electron beams incident on this asymmetric electron lens are weaker than the convergence force, and the axes of the three electron beams are parallel to each other, and each electron beam is characterized by being a beam that diverges more strongly in the vertical direction than in the horizontal direction. Color picture tube device. (2) In a color picture tube device comprising an in-line electron gun section, a deflection section, and a screen section, the electron beam emitted from the electron gun is deflected and scanned in vertical and horizontal directions by the deflection section; is equipped with an electron beam forming section that generates, accelerates, and controls three electron beams, and a main electron lens section that focuses and concentrates the electron beams.
This main electron lens section has a large-diameter asymmetric electron lens that acts commonly on the three electron beams, and this asymmetric electron lens includes a cylindrical electron lens that is common to the three electron beams, and a cylindrical electron lens that acts on the three electron beams in common. Located within the lens area of the electronic lens,
The axes of the three electron beams incident on the asymmetric electron lens are parallel to each other, and the axes of the three electron beams incident on the asymmetric electron lens are parallel to each other, and the axes of the three electron beams entering the asymmetric electron lens are parallel to each other. A color picture tube device characterized by having a beam forming means that produces a beam that diverges more strongly in the vertical direction than in the horizontal direction.