JPH0487237A - Color picture tube device - Google Patents

Abstract

PURPOSE:To improve image quality by combining a beam forming part, a quadrupole lens, an electronic lens having strong focusing effect mainly in vertical direction, and a large aperture common to three electron beams. CONSTITUTION:Three electron beams 7B, 7G, 7R emitted from an electron beam forming part GE are vertically diverged and horizontally focused by a quadrupole lens QEL, the diverging angle of the electron beams 7B, 7G, 7R are controlled by an electron lens PEL having strong focusing effect mainly in vertical direction to enter the beams to a common large aperture electron lens LEL. The common large aperture electron lens LEL can focus and collect the three electron beams 7B, 7G, 7R on a phosphor screen 3 by the focusing effect different between horizontal direction and vertical direction. The lens effect of the electron lens PEL is change synchronously with the deflection of a deflector device 8, whereby the beams can be collected on the phosphor screen 3 whole surface. Thus, the image quality can be improved.

Description

Detailed Description of the Invention [Objective of the Invention] (Industrial Application Field) This invention relates to an in-line color image receiving system that emits three electron beams arranged in a row, consisting of a center beam and a pair of side beams passing on the same plane. The present invention relates to a tube device, and more particularly to a color picture tube device having an electron gun that focuses and concentrates its three electron beams onto a phosphor screen using a common large-diameter electron lens.

(Prior Art) In general, a color picture tube device, as shown in FIG.
Panel (1) and funnel (2) joined together
The panel (1) is opposite to a phosphor screen (3) consisting of a striped or dot-shaped three-color phosphor layer that emits blue, green, and red light, formed on the inner surface of the panel (1). , a shadow mask (4) with a large number of apertures formed inside it is attached, and 3 is emitted from an electron gun (8) disposed in the neck (5) of the funnel (2).
The electron beams (7B), (7G), and (7R) are deflected in the horizontal and vertical directions by the horizontal and vertical deflection magnetic fields formed by the deflection device (8) attached to the outside of the funnel (2). 7B), (7G)
, (7R) are selected using a shadow mask (4) and landed on each phosphor layer, thereby forming a structure in which a color image is displayed on the phosphor screen (3).

In such a color picture tube device, an electron gun (6
) is composed of a center beam (7G) and a pair of side beams (7B), (71?) passing on the same horizontal plane - three electron beams arranged in a row (7B), (7G), (7
The horizontal deflection magnetic field formed by the deflection device (8) is an in-line type electron gun that emits R).
A self-convergence type in-line color picture tube is widely used, which uses a barrel-shaped vertical deflection magnetic field to self-focus the three electron beams (7B), (7G), and (7R) arranged in the above-mentioned column.

Usually, the electron gun (6) controls and accelerates electron emission from the cathode to form three electron beams (7B), (7G),
(7R) and a plurality of grids adjacent to this cathode.
) and 3 emitted from this electron beam forming section (GE).
The main electron lens section (M
L).

In such a color picture tube device, in order to improve the image characteristics on the phosphor screen (3), three electron beams (7B>,
It is necessary to properly focus (7G) and (7R) and concentrate them over the entire surface of the phosphor screen (3).

These three electron beams (7B), (7G), (7R
) is the same in a self-convergence type in-line color picture tube.

Such three electron beams (7B), (7G),
U.S. Patent No. 2.957.10 for concentration of (71?)
No. 6 discloses means for tilting and concentrating three electron beams emitted from an electron gun in advance.

Further, US Pat. No. 3,772,554 discloses that a 3 m
Among the apertures of 1, a pair of side beam apertures is eccentrically located slightly outward from the side beam apertures of the adjacent grid on the side of the electron beam forming section, thereby concentrating the electron beams. There is.

However, even if the electron gun is configured as described above, as tubes become larger and higher in quality, the following problems are newly emerging.

(a) Beam spot diameter on the phosphor screen (b) Distortion of the beam spot in the periphery of the phosphor screen due to the deflection magnetic field (c) Concentration of the three electron beams on the entire surface of the screen, for example, if the tube becomes larger, The distance from the electron gun to the phosphor screen increases, the electron optical magnification of the electron lens increases, the beam spot diameter on the phosphor screen increases, and the resolution deteriorates. In order to reduce the beam spot diameter on this phosphor screen, the lens performance of the electron gun must be improved.

Generally, the main electron lens section that focuses and concentrates the electron beam onto the phosphor screen is formed by applying a predetermined potential to each of the plurality of grids that make up the main electron lens section. The electrostatic lens constructed as a result can be made into a large-diameter electron lens by increasing the aperture diameter of the electrode (although there are several types) due to differences in the configuration of the electrodes. Alternatively, it is effective to increase the electrode spacing to create a long-focus electron lens with a gradual potential change.

However, in a color picture tube, since an electron gun is generally disposed within a narrow neck, the lens aperture is geometrically restricted by the aperture diameter of the electrode. Additionally, increasing the electrode spacing is also limited in order to ensure that the focused electric field formed between the electrodes is not influenced by other undesired electric fields formed within the neck.

In particular, with an ordinary electron gun that emits three electron beams, the smaller the electron beam spacing, the easier it is to concentrate the three electron beams on one point over the entire surface of the phosphor screen, and the advantage is that the deflection power can be reduced. In order to reduce the distance between electron beams, it is desirable to make the apertures of the electrodes smaller.

As such an electron gun, as shown in FIG. 15(a), three electron lenses arranged in parallel on the same plane formed between adjacent grids of an in-line electron gun are superimposed to form one common lens. There is a large-diameter electron lens (LEL), and the lens performance is improved by this common large-diameter electron lens (LEL). FIG. 15(b) shows such an electron gun as a common large-diameter electron lens (LEL) as shown in FIG. 15(a).
It is shown optically in correspondence with. This (b)
In the figure, (KB), (KG), (KR) are three cathodes arranged in a row on the same plane, (PL)
is a prefocus lens.

According to the second electron gun, each electron beam (7B), (7G), (7R) on the phosphor screen (3)
Although the core of is getting smaller, it is still insufficient overall.

That is, three parallel electron beams (7B), (7G), (7R) with an electron beam spacing of Sg are focused by a common large-diameter electron lens (LEL), and a center beam (7G) or a phosphor screen (3 ), the pair of side beams (7B), (7
I? ) results in selective focusing and overconcentration, and is accompanied by large coma aberration.

Therefore, the three beam spots (SPB), (SPG), and (SPR) on the phosphor screen (3) are widely spaced apart, and the pair of side beams (7B) and
(7R) beam spot (SPB), (SPR)
Distortion occurs.

These three electron beams (7B), (7G), (7R
), in order to match the convergence state of the three electron beams (7B), (redundant), (71
? ) If the electron beam spacing Sg of ) is made small to some extent, there will be no practical problem.

However, 3 electron beams (7B), (redundant), (7R)
Regarding concentration on the phosphor screen (3), the electron beam spacing Sg must be made extremely small, and the geometrical arrangement of F' (KB), (K[l;), (KR) There are limits in terms of

(Problem to be Solved by the Invention) As mentioned above, in order to improve the image characteristics of a color picture tube, it is necessary to properly focus the three electron beams and make them concentrate on the entire surface of the phosphor screen. be. To this end, it is effective to use a common large-diameter electron lens as the main electron lens section that converges and concentrates the three electron beams onto the phosphor screen. However, conventional electron guns can fully utilize the performance of their common large-diameter electron lenses, especially when applied to large, high-quality color picture tubes, which can improve their image characteristics. It has become difficult.

This invention was made in view of the above problems, and
In a color picture tube device having an electron gun that emits three electron beams arranged in a row passing on the same plane, the three electron beams are focused and concentrated by a large-diameter electron common to the three electron beams that constitutes the main electron lens section. The object of the present invention is to construct a color picture tube device with excellent image characteristics by fully demonstrating the performance of a large-diameter electron lens common to all three electron beams.

[Structure of the Invention] (Means for Solving the Problems) An electron gun that emits three electron beams arranged in a row consisting of a center beam and a pair of side beams passing on the same plane, and three electron beams emitted from this electron gun. The electron gun is equipped with a deflection device that deflects the beam in horizontal and vertical directions, and a phosphor screen that displays an image by scanning three electron beams deflected in the horizontal and vertical directions by the deflection device. An electron beam forming section consisting of a cathode and a plurality of grids controls emission and accelerates the emitted electrons to form an electron beam, and three electron beams emitted from this electron beam forming section are directed onto the phosphor screen. In a color picture tube device having a main electron lens section consisting of a plurality of grids, the three electron beams commonly pass through the main electron lens section, and the focusing action on the three electron beams is horizontal. A common large-diameter electron lens that differs in the direction and the vertical direction is provided, and between the common large-diameter electron lens and the electron beam forming section, a lens is provided in the direction perpendicular to the three electron beams emitted from the electron beam forming section. A quadrupole lens that exerts a diverging effect and a focusing effect in the horizontal direction, and an electron lens that mainly exerts a strong focusing effect in the vertical direction are provided.

(Function) As described above, a common large-diameter electron lens is provided that focuses the three electron beams differently in the horizontal and vertical directions, and the common large-diameter electron lens and electron beam forming unit are provided for the three electron beams. and a quadrupole lens that exerts a diverging effect in the vertical direction and a focusing effect in the horizontal direction on the three electron beams emitted from the electron beam forming section, and a quadrupole lens that exerts a strong focusing effect mainly in the vertical direction. When an electron lens is provided, the three electron beams emitted from the electron beam forming part are diverged in the vertical direction and focused in the horizontal direction by the quadrupole lens, and then the electron beams, which have a strong focusing effect mainly in the vertical direction, are The divergence angle of the electron beam is controlled to make it enter a common large-diameter electron lens. The common large-diameter electron lens for these three electron beams has different focusing effects in the horizontal and vertical directions.
The three electron beams can be focused and concentrated on the phosphor screen in an optimally focused state.

The three electron beams on the phosphor screen can be well focused over the entire surface of the phosphor screen by changing the lens action of the electron lens, which has a strong focusing effect mainly in the vertical direction, in synchronization with the deflection of the deflection device. can do.

(Example) Hereinafter, the present invention will be described based on an example with reference to the drawings.

FIG. 1 shows a color picture tube device which is one embodiment of the present invention.

This color picture tube device consists of panel (1) and this panel (
A phosphor screen consisting of a three-color phosphor layer that emits blue, green, and red light formed on the inner surface of the panel (1), which has an envelope consisting of a funnel (2) integrally joined to the panel (1). A shadow mask (4) having a large number of apertures formed inside the shadow mask (4) is mounted opposite the mask (3). Also,
An internal conductive film (2J) is formed on the inner surface of the funnel (2) from its cone portion (20) to a portion adjacent to the neck (5). Also, the neck (5) of the funnel (2)
Inside, there is a center beam (7G) and a pair of side beams (7B) that pass on the same horizontal plane (X-Z plane),
An electron gun (22), which will be described later, is provided which emits three electron beams arranged in a row of (7R). This electron gun (
22) is attached by a stem pin (24) which hermetically passes through the stem (23) whose one end seals the end of the neck (5), and whose other end is attached to the distal end of the stem (23) to seal the end of the neck (5). It is supported by a plurality of valve spacers (25) that are in pressure contact with the conductive film (21). Further, on the outside of the funnel (2), three electron beams (7B), (red), (7R) emitted from the electron gun (22) are placed in a horizontal direction (
A deflection device (8) that generates a horizontal deflection magnetic field deflecting in the X-axis direction and a vertical deflection magnetic field deflecting in the vertical direction is attached.

In addition, in FIG. 1, (26) is the shadow mask (4
), (27) is a picture tube drive circuit that operates the color picture tube, (28) is a deflection device (
8) is a deflection device drive circuit that operates.

As shown in FIG. 2, the electron gun (22) has three cathodes (KB), (K
G).

(KR) are arranged in a row in the horizontal direction, and each cathode (KB), (KG), (Kl?) is heated by three heaters ()I) arranged separately. ing.

And this cathode (KB), (KG), (
Kl? ) to the phosphor screen (3), first to seventh grids (G1) to (G7) of integral structure are sequentially arranged. And these heater (H), cathode (KB), (KG).

(KR) and the first to seventh grids (G1) to (G
7) are integrally fixed by a pair of insulating supports (30).

Its first and second grids (Gl), CG2> have three cathodes (KB), (KG
), (KR), three relatively small horizontally long holes (31
) is formed, and the second grid (G3) of the third grid (G3) is formed.
On the G2) side, as shown in (b), three horizontally elongated holes (32) larger than the holes of the second grid (G2) are formed.

And this cathode (KB), (KG), (
The part from KR) to this third grid (G3) is the cathode (KB).

Controls electron emission from (KG) and (KR) and accelerates the emitted electrons to create 3 electron beams (7B),
(7G), (7R)
GE).

Furthermore, the fourth grid (G4) of the third grid (G3)
On the side, as shown in Figure 3(e), there are three vertically long holes (
33) is formed. Also, the fourth grid (G4)
, on the fifth grid (G5) side of the fifth grid (G5) and the sixth grid (G6), as shown in (d),
One horizontally elongated opening (34) is formed. In addition, the phosphor screen (3
) side is a cylinder (35 mm) with a larger diameter than the 5th grid (G5) side.
), and inside this cylinder (35), as shown in Fig. 4, there are three independent openings (38b) and (36c) on both sides in the horizontal direction that are larger than the central opening (36a). Holes (36a), (36b), (36c) are formed, and a pair of protrusions () protrude into the phosphor screen (3) along the upper and lower edges of the openings (36b), (36C) on both sides thereof. 37) is arranged. Further, the seventh grid (G7) consists of a large cylinder surrounding the phosphor screen (3) side of the sixth grid (G6).

Then, from this third grid (G3) to the seventh grid (
A main electron lens that accelerates, converges and concentrates the three electron beams (7B), (red), (7R) emitted from the electron beam forming section (GE) towards the phosphor screen (3). 01L), and substantially forms a large-diameter electron lens (LEL) between the cylinder (33) of the sixth grid (G6) and the seventh grid (G7). There is.

Voltage is applied to each electrode of this electron gun (22) for electrodes other than the seventh grid (G7) through the stem bin (24), and for the seventh grid (G7), voltage is applied through the cone portion (20). ), the internal conductive film (21) and the internal conductive film (2
1) is applied via a valve spacer (25) that is in pressure contact with the valve spacer (25). As another voltage application means, a resistor is placed near the electrode, and the resistor divides the voltage supplied through the anode terminal, internal conductive film, and valve spacer, so that a predetermined voltage is applied to a predetermined electrode. It is also possible to apply

The voltage applied to each electrode is, for example, the cathode (K
B), (KG), and (KR) are set to a cutoff voltage of approximately 150μ, a video signal is added to these, the first grid (G1) is set to ground potential, and the second grid (G2) is set to a 5V voltage.
00v~1kV, 3rd grid (G3) 1.1m5~
10kV, 4th and 6th grid (G4), (G[i
) to 5 to 10 kV, which is slightly higher than the voltage applied to the third grid (G3), 0 to 5 to the fifth grid (G5),
Seventh grid (G7) 1: An anode high voltage of 25-30 kV is applied.

By applying such a voltage, the electron gun (22)
In contrast to the electrode arrangement shown in FIG. 5(a), electron lenses shown in FIG. 5(b) and FIG. 5(e) are formed.

Although the center beam (7G) is shown in (C), the electron lenses formed are the same for the pair of side beams (7B) and (7R).

Each cathode (KB), (K
G).

Electrons emitted from (KR) according to the modulation signal are transmitted to the cathodes (KB), (KG), (KR) and the first
, the second grid (Gl), (G2) intersect with each central axis (ZB), (ZG), (ZR) to form a crossover (Co), and the second and third grids (
G2), (G3) brifocus lens (P
It is slightly focused by L) and enters the third grid (G3) while diverging. At this time, as shown in FIGS. 3(a) and (b), the first and second grids (G1)
, (G2) and the third grid (G3) because the second grid (G2) side holes (31) and (32) are horizontally long. ), (7G), and (71?) are horizontally elongated astig beams.

Next, the three electron beams (7B), (7G), (7R) incident on the third grid (G3) are transmitted through a quadrupole lens formed by the third and fourth grids (G3) and (G4). (QEL) by (ELS),
It narrows down a little in the horizontal direction and diverges greatly in the vertical direction (Y-axis direction).

Next, the three electron beams (7B), (7G),
(71?) are the fourth and fifth grids (G4) shown in Figure 3(d).

(G5) and the fifth grid (G6) of the sixth grid (G6)
A unipotential flat plate electron lens (PEL) formed by a horizontally elongated aperture (34) on the G5) side.
As a result, there is almost no effect in the horizontal direction,
Strongly focused only in the vertical direction. That is, the fourth and fifth
Grid (G4), (G5) and 6th grid (
G6) horizontally elongated 1 on the 5th grid (G5) side
The number of apertures (34) is 3 electron beams (7B), (7
G) For (7R), a flat plate electron lens (PEL) is formed which has a focusing effect only in the vertical direction and has almost no focusing effect in the horizontal direction, and this plate electron lens (PEL) allows 3 Electron beam (7B), (7G
), (7R) are strongly focused only in the vertical direction as mentioned above.

Then, three electron beams (7B), (7G), (
7R) is a large-diameter electron lens (L) common to the three electron beams formed by the sixth and seventh grids (G8) and (G7).
EL).

The large-diameter electron lens (LEL) common to these three electron beams has three independent apertures (36a), (38b), and (38c) shown in FIG. 4 in the middle of the sixth grid (G6).
and a protrusion (37), the plate-shaped electrode (38)
High voltage penetration from the seventh grid (G7) is controlled. Therefore, the large-diameter electron lens (LEL) common to the three electron beams is a large-diameter cylinder (35) on the phosphor screen (3) side of the sixth grid (G6) and a large-diameter electron lens (LEL) that is common to the three electron beams.
7) one large electron lens (EL) formed by the cylinder, and three astiglens (ALL) formed on the low voltage side within this electron lens (EL) region,
(Al2) and (Al1). As a result, the large-diameter electron lens (LEL) common to these three electron beams is
), (7R) are different in the horizontal direction and the vertical direction, and due to the difference in focusing power, the three electron beams (7R) that passed through the flat electron lens (PEL) are different.
B) , (7G), (7R)) are focused and concentrated on the phosphor screen (3).

The difference in horizontal and vertical focusing power of the large diameter lens (LEL) common to the three electron beams mentioned above is that the three electron beams (7B)
, (7G), (7R)) with a phosphor screen (
3) In order to properly concentrate the three electron beams at one point above, the three electron beams (7B), (7G), (7R) are incident on a common large-diameter lens (LEL).
) ) horizontal and vertical virtual object point (VCOH)
, (VCOV) are different. In order to adjust the virtual object points (VCOH) and (VCOV), the electron beam forming section (G
E) forms a horizontally elongated Astig beam, and this electron beam forming section (GE) is equipped with a quadrupole lens (QEL) and a flat plate electron lens (with a focusing effect mainly in the vertical direction).
PEL). In this case,
Horizontal virtual object point (VCO) of center beam (7G)
H) and a pair of Zyde beams (7B)), (71?))
The virtual object point (VCOH) in the horizontal direction requires some adjustment.

Therefore, when the electron gun (22) is configured as described above, the three electron beams (7B), (7G), (7R) are formed by the large diameter lens (LEL) common to the three electron beams.
) can be very well focused on the phosphor screen (3) and properly concentrated at one point on the phosphor screen (3), resulting in a color picture tube device with excellent image characteristics. According to the electron gun (22), even if the cathode spacing SgK (shown in FIG. 5) is increased to some extent, the electron beam spacing SgL at the large aperture lens (LEL) and the electron beam To provide a color picture tube device with good convergence quality that makes it easy to concentrate three electron beams (7B), (7G), and (7R) over the entire surface of a phosphor screen (3) because the interval SgD can be made sufficiently small. In addition, a color picture tube device can be provided which not only allows for the following, but also requires less deflection power.

Note that the three electron beams (7B), (7G), (7R)) emitted from the electron gun (22) are deflected by a deflection device (
When the phosphor screen (3) is scanned horizontally and vertically by being deflected by the horizontal and vertical deflection magnetic fields generated by 8), three electron beams (7B),
(laughter).

(7R)) is subjected to deflection aberration by its deflection magnetic field (41), and when it is selectively focused especially in the vertical direction and scans the peripheral part of the phosphor screen shown in (3a), the three electron beams (7B) , (7G), (7R)) beam spots (SPB), (SPG), (SPY?
) may be significantly distorted and produce a halo portion (42b) in the vertical direction of the core portion (42a).

In such a case, it is preferable to apply a dynamic voltage (43a) to the fifth grid that changes in synchronization with the horizontal deflection period of the deflection device, as shown in FIG. That is, when such a dynamic voltage (43a) is applied to the fifth grid, the focusing effect of the flat electron lens formed by the fourth, fifth, and sixth grids is weakened, and the two points shown in FIG. 5(C) are As shown by the broken lines, three electron beams (7B), (7G),
(7R)) can be placed in an under-focus state, the deflection aberration caused by the above deflection device can be canceled out, and the selective focusing in the vertical direction when scanning the periphery of the phosphor screen can be corrected to direct the three electron beams to the phosphor screen. Good focusing can be achieved over the entire surface.

In the above embodiment, in a unipotential type flat electron lens in which the voltages applied to the fourth, fifth, and sixth grids are high voltage - low voltage - high voltage, a dynamic voltage is applied to the fifth grid. As described above, a dynamic voltage is applied to the fifth grid as a unipotential electron lens in which the voltages applied to the fourth, fifth, and sixth grids are low voltage - high voltage and low voltage. You may also do so. However, in this case, in order to weaken the focusing effect of the flat electron lens when scanning the periphery of the phosphor screen, as shown in FIG. Dynamic voltage that lowers the voltage when scanning the peripheral area of the screen (43
It is necessary to apply b) to the fifth grid.

Furthermore, in the above embodiment, an electron gun is described in which the flat electron lens formed by the fourth, fifth, and sixth grids is a unipotential type electron lens.In this flat electron lens, the fifth grid is omitted. However, a potential difference may be provided between the fourth and sixth grids to form a pi-potential type electron lens.

Furthermore, in the embodiment described above, the electron beam forming section of the electron gun is constructed of a grid having horizontally long apertures. For the difference in focusing force between and the vertical direction,
In order to make the virtual object points of the three electron beams incident on the common large-diameter lens different for the three electron beams, adjustment is made by a combination of a quadrupole lens and an electron lens that focuses mainly in the vertical direction. The cross-sectional shape of the electron beam emitted from the electron beam forming section does not necessarily have to be horizontally long. Therefore, the openings on the second grid side of the first, second and third grids constituting the electron beam forming section may have a circular or vertically elongated shape.

In addition, as a method of forming a horizontally long or vertically long astig beam in the electron beam forming section, the first method is as described above.
In addition to making the openings on the second grid side of the second grid and the third grid horizontally or vertically long, as shown in FIG.
), or as shown in Figure 1O, an aperture (47b) that is a combination of a horizontally elongated slit-like aperture (48) and a vertically elongated slit-like aperture (46),
Alternatively, as shown in FIG. 11, other shapes may be used, such as a circular aperture (49) with protrusions (50) on both sides in the vertical direction. can be made different from each other, and an electron gun can be constructed that exhibits the same effects as the above embodiment.

Furthermore, in the embodiment described above, an electron gun was described in which the sixth grid and the seventh grid form a large diameter lens common to three electron beams. By omitting the plate-shaped electrode placed inside the sixth grid in the example, and adjusting the length of the sixth grid (G6), a common beam size for the three electron beams is created by adjusting the length of the sixth grid (G6) and the seventh grid (G7). It may be configured to form an aperture lens.

Also, JP-A-1. As shown in Japanese Patent No. 287939, a similar plate-shaped electrode may be provided not only on the sixth grid side but also on the seventh grid side.

Further, in the above embodiment, the seventh grid forming the large diameter lens common to the three electron beams was made into a cylinder surrounding the sixth grid, but the seventh grid could also be made into a cylinder similar to the sixth grid. , it is possible to form a large-diameter lens common to three similar electron beams. It is also possible to use the internal conductive film on the inner surface of the neck as the seventh grid.
With this configuration, it is possible to perform different focusing and concentration in the horizontal and vertical directions, similar to the large-diameter lens common to the three electron beams of the above embodiment.

In addition, in the above embodiment, one horizontally elongated opening shown in FIG. 3(d) is formed on the fifth grid side of the fourth grid, the fifth grid, and the sixth grid, and three electron beams are formed. Although a plate-shaped electron lens was formed which mainly focuses the electron beams in the vertical direction, three independent horizontally elongated apertures may be formed as the apertures of these grids, and similarly the three electron beams are focused mainly in the vertical direction. It is possible to form an electronic lens that

In addition, in the above embodiment, in order to form a quadrupole lens, the openings shown in FIGS. 3(C) and 3(d) were formed in the third and fourth grids, respectively. It can also be formed by combining grids with protrusions, or by combining grids with vertically elongated holes, grids with horizontally elongated holes, and grids with vertically elongated holes.

In addition, the openings do not have to be vertically long or horizontally long rectangular holes, but may be combined with a grid having holes with different diameters in the horizontal and vertical directions.For example, the holes in the third grid may be circular. , 4th Gri 1. The apertures in the third grid may be formed in a horizontally elongated oval shape, and a voltage higher than that in the fourth grid is applied to the third grid, or the apertures in the third grid may be formed in a horizontally elongated oval shape, and the fourth A similar quadrupole lens can also be formed by making the openings of the grid into a vertically elongated ellipse.

Moreover, such a quadrupole lens can be formed with three grids. In this case, as shown in FIG. 13, another grid (G34) is arranged between the third grid (G3) and the fourth grid (G4), and the third and fourth grids (G3 ), (G4) are at the same potential and a lower or higher voltage is applied to the grid (G34) to form a quadrupole lens. That is, the third and fourth grids (G34) are
3), when applying a voltage lower than (G4), the openings in the grid (G34) are connected to the third and fourth grids (G3).
) and (G4), and the grid (G34) has the third and fourth grids (G3).
, (G4), the openings of the grid (034) are connected to the third and fourth grids (G3).
) and (G4), a desired quadrupole lens can be formed.

Especially in this case, depending on the voltage of the grid (G34), 4
There is an advantage that the lens power of the polar lens can be adjusted. Note that other parts shown in FIG. 13 are the same as in FIG. 1, so the same numbers are given to the same parts and the explanation thereof will be omitted.

[Effect of the invention] When the three electron beams emitted from the electron beam forming section of the electron gun of the color picture tube are focused and concentrated on the phosphor screen, the three electron beams pass through the main electron lens section in common, and A large-diameter electron lens common to the three electron beams is provided, and the large-diameter electron lens common to the three electron beams has different focusing effects in the horizontal and vertical directions. In between, there is a quadrupole lens that exerts a diverging effect in the vertical direction and a focusing effect in the horizontal direction on the three electron beams emitted from the electron beam forming section, and an electron lens that mainly exerts a strong focusing effect in the vertical direction. When the three electron beams emitted from the electron beam forming section are provided, the quadrupole lens diverges them in the vertical direction and focuses them in the horizontal direction, and then the electron beam is By controlling the divergence angle of the three electron beams, the three electron beams are made to enter a common large-diameter electron lens, and due to the different focusing effects in the horizontal and vertical directions of the large-diameter electron lens common to the three electron beams, By making full use of the performance of the large-diameter electron lens common to all three electron beams, the three electron beams are optimally focused.
It can be focused and concentrated onto a phosphor screen in a concentrated state.

Furthermore, since the deflection aberration of the deflection device can be easily corrected, the bead spot at the periphery of the phosphor screen can be made small, and a color picture tube device with excellent image quality can be achieved.

Furthermore, the electron gun consists of an electron beam forming section, a quadrupole lens, and an electron lens that exerts a strong focusing effect mainly in the vertical direction.
By forming it in combination with a large-diameter electron lens common to all electron beams, the overall length of the electron gun can be shortened.
Effects such as being able to shorten the overall length of the color picture tube can be obtained.

[Brief explanation of the drawing]

1 to 13 are detailed explanatory diagrams of the present invention, in which FIG. 1 is a diagram showing the configuration of a color picture tube device as an embodiment thereof, and FIGS. 2(a) and (b) are respectively the same. An x-2 cross-sectional view and a Y-Z cross-sectional view showing the configuration of the electron gun, FIGS. 3(a) to 3d) are views showing the opening shape of the grid of the electron gun, and FIG. 4 is a cross-sectional view of the electron gun. FIGS. 5(a) to 5(e) are perspective views showing the structure of the plate-shaped electrode, and FIGS.
6(a) and 6(b) are explanatory diagrams of the deflection aberrations of the three electron beams received by the deflection magnetic field of the deflection device, respectively.
The figure is a waveform diagram of the dynamic voltage applied to the fifth grid of the electron gun, FIG. 8 is a waveform diagram of different dynamic voltages applied to the fifth grid of the electron gun in another embodiment, and FIGS. C) and FIGS. 10(a) to C) are a front view, a sectional view, and a rear view showing the opening shapes on the second grid side of the first, second, and third grids in different other embodiments, respectively. , FIG. 11 is a perspective view thereof, FIG. 12 is a perspective view showing a combination structure of the sixth and seventh grids forming a large diameter lens common to three electron beams in another embodiment, and FIG. 13. 14 is a diagram showing the configuration of an electron gun in another embodiment, FIG. 14 is a diagram showing the configuration of a conventional color picture tube device, and FIGS. 15(a) and (b)
are diagrams for explaining the action of a large diameter lens common to three electron beams in each electron gun. 3... Phosphor screen, 7B... Center beam, 7G, 7R... Pair of side beams, 22... Electron gun, 31.32.33, 3436a, 38b, 36c ---
・Opening hole, 37...Protrusion part, 38...Plate electrode, G2...Second grid, G4...Fourth grid, G6...Sixth grid, H...Heater, Gl ...1st grid, G3...3rd grid, G5...5th grid, G7...7th grid, KB, KG, KI? ...Cathode, ALL, Al1. Al1...Astiglens, LE
L... Common large aperture lens, PEL... Flat electronic lens, QPL... Quadrupole lens, Agent: Patent attorney Norio Ogo. Daisumi, 2nd verse 2 Konten fig. fig. fig. fig. 49 fig.

Claims (1)

[Claims] An electron gun that emits three electron beams arranged in a row consisting of a center beam and a pair of side beams passing on the same plane; a deflection device that deflects the three electron beams emitted from the electron gun in horizontal and vertical directions; a phosphor screen for displaying an image by scanning three electron beams deflected horizontally and vertically by a deflection device, the electron gun controlling electron emission from the cathode and accelerating the emitted electrons; an electron beam forming section consisting of a cathode and a plurality of grids that form an electron beam; and a main electron beam forming section consisting of a plurality of grids converging and concentrating three electron beams emitted from the electron beam forming section onto the phosphor screen. In the color picture tube device having a lens section, the main electron lens section includes a common large-diameter electron lens that allows the three electron beams to commonly pass therethrough and has different focusing effects on the three electron beams in the horizontal and vertical directions. 3 emitted from the electron beam forming section between this common large diameter electron lens and the electron beam forming section.
A color picture tube device comprising a quadrupole lens that exerts a diverging effect in the vertical direction and a focusing effect in the horizontal direction on an electron beam, and an electron lens that mainly exerts a strong focusing effect in the vertical direction.