JPH03230457A - Color picture tube device - Google Patents

Abstract

PURPOSE:To reduce a beam spot and display a good image by constituting a main lens section focusing and concentrating three electron beams emitted from an electron gun with a large-diameter lens. CONSTITUTION:A funnel is integrally connected to a panel 1. A deflecting device 8 generating the magnetic field deflecting three electron beams 7B, 7G, 7R emitted from an electron gun 22 in the horizontal direction and the vertical direction is fitted on the outside. The beams 7B, 7G, 7R commonly pass a large- diameter electron lens LEL constituted of grids G1-G9 of a main lens section. A four-pole lens FPL is provided on an electron beam forming section side from the lens LEL. The lens FPL has a divergence action in the horizontal direction and a convergence action in the vertical direction and bends side beams 7B, 7R in separating directions to feed them into the lens FPL. The center beam 7G and the beams 7B, 7R can be properly converged and concentrated on a fluorescent screen 3. A beam spot is reduced, and a good image can be displayed.

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 whose three electron beams are focused and concentrated onto a phosphor screen by means of 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
It has an envelope consisting of a panel (1) and faces 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 the shadow mask (4) is attached, and the electron beam (3) is emitted from an electron gun (6) disposed within 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 this phosphor screen (3).

In such a color picture tube device, an electron gun (6
) are arranged in a line consisting of a center beam and a pair of sight beams (7B) that pass on the same horizontal plane.
, (7G), (7R), and the horizontal deflection magnetic field formed by the deflection device (8) is pink-song-yong type, and the vertical deflection magnetic field is barrel-shaped, so that the three electron beams in the above-mentioned column arrangement are formed. (7B), (7G).

(7R) Self-convergence type in-line color picture tubes that self-focus are widely used.

Usually, the electron gun (6) controls and accelerates electron emission from the cathode to form three electron beams (7B), (7G),
(7R) and three electron beams (7B) emitted from this electron beam forming section (GE).

(7G), (7R) and a main lens section (ML) consisting of a plurality of grids that converge and concentrate.

In order to improve the image quality on the phosphor screen (3), three electron beams (
7B), (7G), and (7R) properly,
and its focused electron beam (7B), (7G)
, (7R) must be concentrated on the entire surface of the phosphor screen (3), and these three electron beams (7B)
, (7G), and (7R) are the same in a self-convergence type in-line color picture tube.

Such three electron beams (7B), (7G),
(7R), U.S. Patent No. 2.957,106
The patent specification discloses a means for pre-tilting and concentrating three electron beams emitted from an electron gun. Further, in U.S. Patent No. 3,772.554, of the three apertures formed in the grid constituting the main lens part, a pair of side beam apertures are placed on the side of the electron beam forming part. Means for concentrating the beams by eccentrically slightly outwardly of the side beam apertures of adjacent grids is shown.

However, even if the electron gun is configured as described above, as tubes become larger and higher in quality, problems such as the above are coming into focus.

(a) Beam spot diameter on the phosphor screen (b) Distortion of the beam spot at the periphery of the phosphor screen caused by the deflection magnetic field.

(c) Concentration of the three electron beams over the entire screen, for example, as the tube becomes larger, the distance from the electron gun to the phosphor screen increases, and the electron optical magnification of the electron lens increases, causing The beam spot diameter 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 lens section is formed by applying a predetermined potential to each of a plurality of grids that constitute the main lens section. There are several types of electrostatic lenses that are constructed as a result, depending on the configuration of the electrodes, but in order to improve lens performance, the aperture diameter of the electrodes is basically increased to create a large-diameter lens. Alternatively, it is effective to increase the electrode spacing to create a long focal length lens with gradual potential changes.

However, since a color picture tube generally has an electron gun disposed within a narrow neck, the lens aperture is geometrically limited 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. It is desirable to make the apertures of the electrodes smaller in order to reduce the distance between electron beams.

As shown in FIG. 15(a), such an electron gun is constructed by superimposing three parallel electron lenses on the same plane of an in-line electron gun into one common large-diameter lens (LE).
L), and the lens performance is improved by using this common large-diameter lens (LEL). Figure 15(b) shows the large diameter lens (L) in Figure 15(a).
This is an optical diagram corresponding to EL). this(
b) In figure (KB).

(KG) and (KR) are three cathodes arranged in a row on the same plane, and (PL) is a brifocal lens.

According to this electron gun, the core of each electron beam (7B), (redacted), (71?) on the phosphor screen (3) becomes smaller or is still insufficient overall.

That is, three parallel electron beams (7B), (7G), and (7R) with an electron beam spacing of SG pass through a common large-diameter lens (LEL), and a center beam (7G) is formed.
) is properly focused on the phosphor screen (3), the pair of side beams (7B>, (7R) are overfocused and overconcentrated, accompanied by large coma aberration. Therefore, the phosphor screen ( 3) The upper three beam spots (SPB), (SPG), and (SPR) are widely spaced apart, and a pair of side beams (7B), (7
R) spots (SPB) and (SPR) are distorted.

As a means to solve these problems, U.S. Patent No.
, 011,090, U.S. Patent No. 2.861.

Specification No. 208, Japanese Patent Application Laid-open No. 53-69, etc. disclose a low potential electrode (fourth grid) (G4) having three holes (10) as shown in FIG. 16(a). High potential electrode (5th grid) with one common aperture (11) (G5)
A pair of side beams (7B), (
7R) are bent in the direction of separating from each other, the fifth grid (G5) and the next sixth grid (G5) are bent.
A common large-diameter lens formed between G6) and EL)
This shows an arrangement in which three electron beams are focused and concentrated.

However, in this electron gun, (
a) As shown in correspondence with each lens (LD) and (LEL) in the figure, in addition to the diverging lens (LD) formed between the fourth grid (G4) and the fifth grid (G5), , three independent holes (10) in the fourth grid (G4)
For each separate small focusing lens (LC
) is formed. Therefore, when the diverging lens (LD) is strengthened, the converging lens (LC) is also strengthened, and each electron beam (7B), (7G), (7R) is strongly focused by the converging lens (LC) and has a large aperture. lens(
The ratio of focusing by the LEL is reduced, and the performance of the large-diameter lens (LEL) cannot be fully demonstrated, and it does not contribute much to improving the image quality of the color picture tube.

Furthermore, as shown in FIG. 17, JP-A-1-31333 discloses three electron beams (7B), (7G),
(7R) is a cylindrical low potential electrode (third
Grid) (G3) has a cylindrical high potential electrode (4th
As shown in FIG. 18, three electron beams (7B) are placed adjacent to the grid (G4) and in the middle of the low potential electrode (G3).

(7G) and (7R) are formed in common, and the potential permeating from the high potential electrode (G4) is controlled by the hole (12). , 3 electron beams (7B) , (7G) , (7
R) is shown to perform focusing and concentration.

However, this electron gun produces 3 electron beams (7B).
, (7G) and (7R),
A dumpling-shaped aperture (12) must be formed on the side of the high potential electrode (G4), and as a result, the center beam (7G
) and a pair of side beams (7B),
The focusing effect on (7R) is significantly different, making it difficult to focus the three electron beams (7B), (7c), and (7R) on the phosphor screen in the same way.

(Problems to be Solved by the Invention) As mentioned above, in order to improve the image quality of a color picture tube, it is necessary to properly focus the three electron beams and to spread the focused electron beam over the entire surface of the phosphor screen. It is necessary to concentrate the three electron beams, and for this purpose, it is effective to use a common large-diameter lens as the main lens section that converges and concentrates the three electron beams. However, conventional electron guns cannot fully demonstrate the performance of their common large-diameter lenses, and it is difficult to improve the image quality, especially when applied to large, high-quality color picture tubes. It has become.

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 main lens part that converges and concentrates the three electron beams is composed of a large-diameter lens, and the large-diameter lens is The purpose is to fully demonstrate performance.

[Structure of the Invention] (Means for Solving the Problems) An electron gun that emits three electron beams consisting of a center beam and a pair of side beams arranged in a row passing on the same plane, and three electron beams emitted from this electron gun. a deflection device that deflects the beam in horizontal and vertical directions; In a color picture tube, the main lens part is provided with a common large-diameter electron lens constituted by at least two grids through which three electron beams pass in common, At least two grids having non-circular electron beam passing holes through which three electron beams pass in common on the electron beam forming part side of the large-diameter electron lens have a diverging effect in the horizontal direction and a focusing effect in the vertical direction. A quadrupole lens was installed.

(Function) As mentioned above, if a quadrupole lens that has a diverging effect in the horizontal direction and a focusing effect in the vertical direction is provided closer to the electron beam forming section than the common large-diameter electron lens, this quadrupole lens As a result, the pair of side beams are bent in a direction away from each other, and at the same time are subjected to a diverging effect stronger than the center beam, and are incident on a common large-diameter electron lens. Then, the center beam and the pair of side beams can be properly focused and concentrated on the phosphor screen by a common large-diameter electron lens.

(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 (21) 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), there is a horizontal deflection magnetic field that deflects the three electron beams (7B), (7G), (7R) emitted from the electron gun (22) in the horizontal direction (X-axis direction). Deflection device (8) that generates a vertical deflection magnetic field that deflects in the vertical direction
) is installed.

In addition, in FIG. 1, (26) is the shadow mask (4
).

As shown in Figure 2, the electron gun (22) has three cathodes (KB), (KG), and
(KR) are arranged horizontally in a row, each of whose cathodes (KB).

(KG) and (KR) are heated by three heaters (H) placed separately. And these cathodes (KB), (KG), (K
The first to ninth grids (G1) to (G9) of integral structure are arranged sequentially from the heater (H), the cathode (KB), (K) toward the phosphor screen (3).
G), (KR) and the first to ninth grids (G)
1) to (G9) are integrally fixed by a pair of insulating supports (28).

Its first and second grids (Gl), (G2) have three cathodes (KB), (K
Three relatively small apertures corresponding to G) and (KR) are formed in the second grid (G3) of the third grid (G3).
2) side has 3 holes larger than the opening of the second grid (G2).
Apertures are formed at the cathode (KB), (K
G), (KR) to this third grid (G3), or the cathode (KB), (KG).

It constitutes an electron beam forming section (GE) that controls and accelerates electron emission from (KR) to form three electron beams (7B), (7R), and (7R).

Also, on the fourth grid (G4) side of the third grid (G3), on the fourth grid (G4) side of the fourth grid (G4), and on the fourth grid (G4) side of the fifth grid (G5), as shown in Figure 3 (a), In the above-mentioned - column arrangement of three cathodes (KB), (KG
), (KR) corresponding to three relatively large apertures (
29) is formed. Also, the fifth grid (G5)
6th grid (G6) side and 6th grid (G6)
As shown in Fig. 3(b), on the fifth grid (G5) side of the grid, on the sixth grid (G6) side of the sixth grid (G6), and on the sixth grid (G6) side of the seventh grid (G7), there are horizontally elongated One horizontally long aperture (30) with a wide width at the end is formed. Further, on the side of the eighth grid (G8) of the seventh grid (G7), as shown in FIG. 3(C), one horizontally elongated opening (31) is formed.

Furthermore, the seventh grid (G8) of the eighth grid (G8)
7) side, as shown in FIG. 3(d), the above-mentioned opening (3)
One aperture (32) is formed which is laterally longer than 1).

The phosphor screen side of this eighth grid (G8) is a cylinder (33) with a larger diameter in the horizontal direction than the adjacent part on the seventh grid (G7) side, and the phosphor screen of this cylinder (33) As shown in FIG. 4, in the middle part of the distance HD from the side edge of the screen (3) (the bottom of the cylinder (33) in the drawing),
A single horizontally elongated opening (34) is formed in the horizontal direction.

Also, the 9th grid (G9) is the 8th grid (G8)
A large diameter cylinder (3) surrounding the phosphor screen (3) side of the
5), and a large-diameter lens (LE
L) is formed.

Voltage is applied to each electrode of this electron gun (22) for the electrodes other than the ninth grid (G9) through the stem bin (24), and for the ninth grid (G9), the voltage is applied to each electrode of the electron gun (22) through the stem bin (24). ), 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, and applies the divided voltage to a predetermined electrode. is also possible.

The voltage applied to each electrode is, for example, cut (KB
), (KG), and (KR) are set to a cutoff voltage of approximately 150μ, a video signal is added to these, the first grid (Gl) is set to ground potential, and the second grid (G2) is set to a cutoff voltage of approximately 150μ.
0~lkV.

3rd, 5th, 8th grid (G3), (G5),
(G8) 5-10kV, 4th grid (G4) 0
~1kV, 2-5kV on the 6th grid (G6), 15-20kV on the 7th grid (G7), 15-20kV on the 9th grid (G9)
) is applied with an anode high voltage of 25-30 kV.

By applying such a voltage, the electron gun (22)
In contrast to the electrode arrangement shown in FIG. 4(a), an electron lens shown in FIG. 4(b) and FIG. 4(C) is 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).

The electron beam emitted from (KR) according to the modulation signal is transmitted from the cathodes (KB), (KG), (KR) and the first and second grids (Gl), (G2) +:
Each central axis (ZB), (ZG).

(ZR) to form the first crossover (Cot), and the second and third grids (G2) and (G3) are slightly focused by the prefocus lens (P) to form the third grid (G3). The electron beam (7G) incident on this third grid (G3)
, (7B).

(7R) is the third, fourth, and fifth grid (G3),
(G4).

(G5) by separate weak cylindrical unipotential lenses (ELS) formed by horizontal and vertical (Y
axial direction). Then, the fifth, sixth, and seventh grids (G5), (G6), (G7
), each electron beam (7G), (7B) is
, (7R) is strongly focused only in the vertical direction. ((
C) see figure) so that each electron beam (redacted), (7B
), (7R) are vertically aligned with each central axis (ZB), (ZG),
It intersects with (ZR), forms a second crossover (CO2) (only (ZG) is shown in the figure (C)), and then proceeds while diverging. Next, the 7th and 8th Grid (G7)
, (Gll) with different diameters (31).

(32) The quadrupole nons (FPL) formed between each electron beam (7G), (7B), (7R)
is subjected to a focusing action in the vertical direction and a diverging action in the horizontal direction, and a pair of side beams (7B) and (7R) are
bent in directions away from each other. In particular, its divergence effect is caused by the openings (
31) and (32) are horizontally long, the center beam (
A pair of side beams (7B), (7R
) has a strong effect on In this situation, the 8th grid (
Electron beam incident on G8) (7B), (7R
) are focused and concentrated onto the phosphor screen (3) by a common large aperture lens (LEL) formed by the eighth and ninth grids (G8) and (G9).

To explain in more detail the focusing and concentration by the large-diameter lens (LEL) mentioned above, a large-diameter lens formed by arranging two cylindrical electrodes facing each other or partially overlapping each other is used to attach a parallel lens with a predetermined object point. When three electron beams are incident, the center beam (
7G) is properly focused, the pair of side beams (7B) and (7R) are overfocused and overconcentrated, and a large coma aberration occurs, causing each beam spot on the phosphor screen (3) to (SPB), (SPG
) and (SPR) are greatly separated, and the pair of sight beams (7B) and (7R) are distorted.

Therefore, a limit was set on the length of the low potential electrode, and the limit was set by a horizontally elongated aperture (34) provided in the middle part of the distance g from the side edge of the phosphor screen (3) (see Fig. 3). e)
), the distance Ω to the aperture (34) greatly influences the characteristics of the electron lens.

That is, the eighth and ninth grids (
Figures 5(a) and (G8) showing parts G8) and (G9)
b), the eighth grid (G
8) The inner diameter of the cylindrical part (33) on the phosphor screen side is D.
L, If the inner diameter of the ninth grid (G9) (cylindrical electrode), which is a high potential electrode, is DH, the potential on the central axis (Z axis) is as shown in the curve (36) shown in Figure 5 (C). The potential penetrates from the center to the left and right by DL and DH, respectively, and the region where this potential penetrates becomes the region that acts as an electron lens (large aperture lens). Therefore, even if the horizontally long aperture (34) of the eighth grid (G8) is placed deeper than its inner diameter DL (47>DL), it will not affect the characteristics of the electron lens, but if placed shallower than DL (47<DL), it will not affect the characteristics of the electron lens. ), the penetration of the high-voltage side potential is affected, which affects the characteristics of the electron lens.

Therefore, as shown in FIG. 5(d), three parallel electron beams (redundant) with a predetermined object point are attached to the electrodes arranged as shown in FIGS. 5(a) and (b). , (7R
) are incident while diverging, and the convergence and concentration state of the three electron beams <7G), (7B), and (7R) on the phosphor screen (3) located a predetermined distance apart is expressed as The result will be as shown in Figure 6 (a) to C).

That is, the curve (37) in FIG. 6(a) corresponds to the phosphor screen (3) shown in FIG. 5(d) with distance g as the horizontal axis.
The center beam (7G) and a pair of side beams (
7B) and (7R), the vertical axis represents the relationship between the distance g and the distance H3. Also, the 6th
The curve (38) in figure (b) is of the center beam (7B),
In addition, the curve (39) is a pair of side beams (7B),
The horizontal focusing state of (7R) is shown by averaging comatic aberration differences. (See Figure 5(d)) Furthermore,
The curve (40) in Fig. 6(c) is indicated by the arrow (40) in Fig. 5(d).
41a), (41b) A pair of side beams shown (
7B), (7R) difference in focusing between the center and peripheral sides,
In other words, it shows the coma aberration difference.

As can be seen from the curve (37) in FIG. 6(a), when the distance g is larger than DL of the inner diameter of the cylindrical portion on the phosphor screen side of the eighth grid (G8), the center beam (
7G) and the pair of side beams (7B) and (7R) is large and overconcentrated, but the distance g is smaller than the inner diameter DL.
As the distance H8 becomes smaller, the interval H8 becomes smaller and smaller until the point (
As shown in 42), it becomes possible to concentrate on one point. on the other hand,
As can be seen from curves (38) and (39) in Fig. 6(b), the difference in the focusing state between the center beam (7G) and the pair of sight beams (7B) and (7R) is that the distance g is equal to the inner diameter. It is small when it is larger than DL, but the distance g or inner diameter DL
The smaller it gets, the bigger it gets. This means that the center beam (7G) is relatively focused on a pair of side beams (7B).
, , (7R) is weaker than the focusing. Also, the 6th
As can be seen from the curve (40) in Figure (C), the comatic aberration of the pair of side beams (7B)' and (7R) is determined by the distance Ω
When the distance Ω becomes smaller than the inner diameter DL, the distance gradually increases, but even in a region where the distance Ω is larger than the inner diameter DL, it exists to some extent.

Therefore, from the results shown in Fig. 6(a) to C), the key to adjusting the distance Ω is to position the three parallel incident electron beams (7G), (7B), and (7R) a predetermined distance apart. It is not possible to simultaneously concentrate the light onto the phosphor screen (3) which is also properly focused. Even if the openings (34) of this eighth grid (G8) are made into a dumpling shape as shown in FIG. 18, the above characteristics remain essentially unchanged. Furthermore, as in the above-mentioned Japanese Patent Application Laid-open No. 53-69 (see Fig. 16), if a pair of side beams are made to diverge in directions away from each other and are made incident on a large-diameter lens, three electron beams can be converted into one. Although it may be possible to focus on a point, in this case coma makes it difficult to properly focus the three electron beams in the same way. Furthermore, as described above, in this case, the focusing characteristics change due to the small diameter electron lens (LC), making it impossible to take advantage of the characteristics of the large diameter lens.

Therefore, consider a case where a quadrupole lens is formed by two electrodes having a common horizontally elongated aperture for three electron beams, as in the electron gun of this example. That is, as shown in FIGS. 7(a) and (b), the seventh grid (G7) on the high potential side
) When the horizontally long hole (32) of the eighth grid (G8) on the low potential side is made horizontally long and faces the horizontally long hole (31〉), it has a diverging effect in the horizontal direction and A quadrupole lens (PPL) having a focusing effect in the direction can be formed.

When three parallel electron beams with a predetermined object point on the high-potential seventh grid (G7) enter such a quadrupole lens (FPL) while diverging, the divergence force for the electron beams increases as the distance to the periphery increases. The divergence force acting on the center beam and the divergence force acting on the pair of side beams are significantly different.

This difference in divergence force is shown in Figure 7(c), with the aperture diameter on the high potential side being 20. OX6.0 city, voltage 20kV, low potential side opening diameter 22. Next, a case will be shown in which parallel beams (7) are incident at intervals of 0.5 mm into a quadrupole lens formed when OX4, 52 mm and voltage is 9 kV. If the divergence angle θ at which the parallel beam (7) exits is determined from this figure, it will become like the curve (43a) in FIG. 8, and the divergence angle θ will suddenly increase in the periphery.

Therefore, when three parallel electron beams with a predetermined object point enter a quadrupole lens (FPL) while diverging, the pair of side beams will diverge more strongly than the center beam, and each side beam will diverge more strongly than the center beam. Also, the peripheral side diverges more strongly. Moreover, the pair of side beams are
Since the center side is also subjected to a diverging action, it is bent in the direction of separating from each other.

The strength and state of the divergence and deflection effects of such a quadrupole lens (FPL) can be changed by changing the aperture shape of the opposing electrodes or by changing the potential.

In addition, as shown in Fig. 9, horizontally long holes (31), (32)
)'s dish or tongue pieces (44) are provided on the left and right sides, and the width H
It can be easily adjusted by changing w, length Hl, interval Hh, etc., or by changing the interval between opposing electrodes (in this case, including the case where the tongue pieces (44) are overlapped). For example, the seventh and eighth grids (G7) shown in FIGS. 7(a) and (b).

(G8), if the horizontally long aperture (31) of the seventh grid (G7) on the high potential side is made a little closer to a square, the incident parallel beam will be The magnitude and state of the divergence angle θ of the beam exiting from the beam change greatly. Needless to say, the strength and state of the divergence and deflection effects of this quadrupole lens change by changing the electrode potential, so the electrode potential and the aperture (31
) and (32), a quadrupole lens (FPL) having the required divergence and deflection action can be obtained.

Therefore, as shown in FIGS. 2(a) and (b), the three electron beams (7B), (7G), (7R) are connected to the seventh and eighth grids (G7), (G8) as described above.
), the center beam (
7G) is diverged by its quadrupole lens (FPL), enters a common large aperture lens (LEL), and is properly focused onto a phosphor screen (3) spaced a predetermined distance apart. In addition, the pair of side beams (7B) and (7R) are
The polar lens (FPL) causes the beam to diverge more strongly than the center beam (7G), while the peripheral side is more strongly diverged than the center, and the beam center axis is the same as the center beam (7G).
), while a common large-diameter lens (LEL
). As a result, it was found that the common large aperture lens (LEL) had a stronger focusing effect on the pair of side beams (7B) and (7R) than on the center beam (7G). ) has comatic aberration, and a pair of side beams (7B) and (7R)
The pair of side beams (7B) and (7R) are offset by the excessive concentration that occurs in the center beam (7G).
) will reach the same position on the phosphor screen (3) as the center beam (7G) and will be properly focused like the center beam (7G).

Needless to say, in this case, the divergence characteristics of the quadrupole lens (PPL) and the convergence characteristics of the common large aperture lens (LEL) need to be adjusted. For example, the eighth grid (G8
) at a position where the distance Ω from the end of the horizontally long opening (34) on the phosphor screen side is larger than the inner diameter DL of the cylindrical portion (33) on the phosphor screen side of the eighth grid (G8) on the low potential side. If (1) > DL), the quadrupole lens (FPL
), the horizontally long aperture (31) of the seventh grid (G7) on the high potential side is made close to a square, and a quadrupole lens (FP
L), each center beam of the pair of side beams is incident on the large aperture lens (LEL) with a large divergence angle, and both the center beam and the pair of side beams are subjected to a strong divergence effect, and the 10th As shown in the figure,
When three electron beams (7B), (7B), (7R) enter a common large aperture lens (LEL), they basically appear to be emitted from one object point (Coo), and the three electron beams (7B), (7G), and (7R) can be appropriately focused and concentrated on the phosphor screen (3) separated by a predetermined distance.

Also, if the distance Mg is at a position smaller than the inner diameter DL (
1<DL), as described above based on FIG. Aperture lens (
LEL), the symmetrical cylindrical electron lens is slightly disturbed and has an asymmetrical component. Therefore, a quadrupole lens (FP
L), the horizontally long opening (31) of the seventh grid (G7) on the high potential side is made horizontally long, and a quadrupole lens with divergent characteristics as shown in the curve (43a) shown in Fig. 8 is formed. (PP
L).

With such a quadrupole lens (FPL), it is possible to give a divergent effect to a pair of side beams while hardly giving a divergent effect to a center beam, and it is possible to give a divergent effect to a pair of side beams relatively more strongly than a center beam. , and the peripheral side of each side beam is made to diverge more strongly than the central side. On the other hand, since the concentration error for the three electron beams of a common large-diameter lens (LEL) is small, if the pair of side beams are slightly diverged and incident, they will be concentrated at one point.

Furthermore, since the pair of side beams are focused more strongly than the center beam, if the pair of side beams are strongly diverged and incident, they will be focused in the same way. moreover,
A pair of side beams causes coma aberration because the peripheral side is focused more strongly than the central side.
By injecting an electron beam that is more strongly divergent on the peripheral side than on the central side, the coma aberration can also be corrected.

As mentioned above, the three electron beams horizontally include the seventh,
8th and 9th Grid (G7), (Gill),
(G9) and a common large aperture lens (LEL), it is possible to properly focus and concentrate on one point on the phosphor screen (3) separated by a predetermined distance. can.

On the other hand, in the vertical direction, the 3 electron beams are 4
focused by a polar lens (FPL);
The light is focused by a common large-diameter lens (LEL) formed by the ninth grid (G8) and (G9), and is focused more strongly than in the horizontal direction.

Therefore, in the electron gun (22) of this example, the fifth, sixth, and seventh grids (G5), (G6), and (G7) are used to strongly focus only in the vertical direction, and the center beam is shown in Fig. 4 (C). As shown for (7G), three electron beams are made to intersect each central axis in the seventh grid (G7) and the second
Form a crossover (CO2), then the 7th and 8th
The light enters the quadrupole lens (PP1.,) formed by the grids (G7) and (G8) and is focused onto the phosphor screen (3) in the same way as in the horizontal direction.

When the second crossover (CO2) is formed in the vertical direction in this way, the fifth, sixth, and seventh grids (G5),
By changing the lens action of (G6) and (G7) to match the deflection period of the deflection yoke (8), deflection aberration can be suppressed and the beam spot around the phosphor screen (3) can be made smaller. can.

In addition, for the electron gun (22) in this example, the voltage of the eighth grid (G8) is adjusted, and the phosphor screen (3) is
Upper beam spot (SPB), (SPG),
When fine-tuning the focusing of (SPR), a large aperture lens (LEL) that has the same strength as a quadrupole lens (FPL)
3 electron beams (7B), (
7G) and (7R) do not fluctuate.

Furthermore, when assembling the electron gun of this example, the ninth
From the grid (G9) to the fifth grid (G5), there are horizontally long openings (34) to 5 formed in each grid.
Since a center rod having the same cross-sectional shape as (30) can be inserted and assembly can be performed using the center rod as a reference, there is also the advantage that assembly can be performed with high precision.

Next, a specific example of the electron gun of this example will be shown.

Cathode spacing Sg = 4.92 mm + Electrode aperture diameter 1st grid, 2nd grid aperture diameter = 0.62 mm 4th grid side aperture diameter of 3rd grid, 4th grid, 5th grid = 4.52 mm 5th grid , 6th grid side opening diameter of 6th grid and 7th grid (vertical diameter/horizontal diameter) -6,0mn+/22.
0mm Hole diameter on the 6th grid side of the 7th grid (vertical diameter/horizontal diameter)
=6.0 mn+/20.0mm+7th grid of 8th grid
Grid side opening diameter (vertical diameter/horizontal diameter) = 4.52mm+
/ 22.0mm middle opening diameter of the 8th grid (vertical diameter /
Lateral diameter) = 7.0 m11/20.0+nm Opening diameter of the cylindrical part on the phosphor screen side of the 8th grid = 2
5.0mm Opening diameter of 9th grid = 28.0mm Electrode length 3rd grid = 2.5mm+, 4th grid -2.0
mu + 5th grid = 9.2mm, 6th grid - 4
mm 7th grid = 21, mn+, 8th grid = 37.0 mm, distance from the phosphor screen side end of the 8th grid to the middle opening = 1.5.0 mm, 9th grid = 40 m+++, and this electron As a result of applying the gun to a 32-inch 110 degree polarized color picture tube, the three electron beams could be focused and properly focused on one point on the phosphor screen.

In the electron gun of the above embodiment, other electron lenses such as a brifocus lens and a cylindrical unipotential lens are used to improve focus adjustment and the performance of the electron gun as a whole.
This is a means of forming a small beam spot in the center of the phosphor screen. Therefore, it is optional to use an asymmetric lens or an electron lens with a different configuration for these.

Further, in the electron gun of the above embodiment, the opening in the middle part of the eighth grid is horizontally long, but the opening is not limited to horizontally long, but may be vertically long.

Also, even when the lens is vertically long, the characteristics of the common large-diameter lens vary greatly depending on the distance Ω from the end of the 8th grid on the phosphor screen side, but it can also be used in this case by matching the characteristics of the quadrupole lens. It is.

Furthermore, in the electron gun of the above embodiment, the ninth grid is the eighth grid.
Although this structure surrounds the grid, the electron gun according to the present invention is not limited to this, and may have cylindrical electrodes facing each other.

Next, other embodiments will be described.

The electron gun (22) shown in FIG. 11 eliminates the electron lens (VL) formed by the fifth, sixth, and seventh grids in the electron gun (shown in the second figure) of the above embodiment, and replaces it with a quadrupole lens (VL).
PPL).

That is, three cuts (KB) arranged in a row in the horizontal direction are heated separately by three heaters (11).
, (KO), (KR), the nodes 1, 2, and 3 grids (Gl) are sequentially placed on the phosphor screen (3) side.
).

(G2) and (G3) are placed. The openings on the second grid (G2) side of the first and second grids (Gl), (G2) and third grid (G3) are respectively the same as those of the electron gun of the above embodiment, or On the fourth grid (G4) side of the grid (G3), there is a
), three oblong holes (46) are formed in a row in the horizontal direction. This third grid (G3
), three vertically elongated holes (47) are provided on the third grid (G3) side of the fourth grid (G4), as shown in FIG. 12(b). These three openings (4Ei) are formed in a row in the horizontal direction.
(47), a quadrupole lens (FPL) is formed separately.

In addition, on the fifth grid (G5) side of the fourth grid (G4), three electron beams (7B), (7G), (7
The aperture (3) shown in FIG.
A horizontally elongated hole similar to 2) is further formed in the fifth grid (G
5), a horizontally elongated hole similar to the hole (31) shown in FIG. 3(C) is formed on the fourth grid (G4) side.

Note that the horizontally elongated opening in the middle of the fifth grid (G5), the cylindrical part (33) on the phosphor screen (3) side of the fifth grid (G5), and the sixth grid (G6) are the same as in the above embodiment. The horizontally elongated opening in the middle part of the eighth grid, the cylindrical part on the phosphor screen side of the eighth grid, and the same shape as the ninth grid.

The voltage applied to each electrode of this electron gun (22) is, for example, each cathode (KB), (KG), (KR)
is set as a cutoff voltage of approximately 150μ, a video signal is added to this, the first grid l” (Gl) is set to ground potential, and the third
, 5 to 10 kV to the 5th grid (G3), (G5)
, an anode high voltage of 2-5 kV is applied to the fourth grid (G4) and 25-30 kV to the sixth grid (G6).

By applying such a voltage, this electron gun (2
2), the same electrode arrangement (b) is shown in contrast to the electrode arrangement in Fig. 13(a).
) and (C) are formed.

That is, each cathode (KB), (KG), (
The electron beam emitted from the cathode (KB)
, (KG), (KR) and the first and second grids (Gl>, (G2)), each central axis (ZB),
(ZG), (ZR) to form the first crossover (COI), and the second and third grids (G2),
(G3) is slightly focused by the prefocus lens (PL) and enters the third grid (G3) while diverging. Each of the electron beams (7B), (7G), (7R) incident on this third grid (G3) is transmitted to each of the three separate 4 electron beams formed between the third and fourth grids (03) and (G4). A polar lens (FPLI) focuses horizontally and diverges vertically. Next, the fourth
Three separate quadrupole lenses (FPL2) formed between the fifth grids (G4) and (G5) diverge in the horizontal direction and focus in the vertical direction, and a pair of side beams (7B), ( 7R) are bent in directions away from each other. At this time, a pair of sight beams (7B), (
7R) is subjected to a stronger divergence effect than the center beam (7G). Therefore, each electron beam (7B), (7G
), (7R) are the fifth and sixth grids (G5), (
G6) common large aperture lens (LEL) formed by
The light is focused and concentrated on the phosphor screen (3) separated by a predetermined distance.

That is, in the electron gun (22) of this example, three electron beams (7B) are generated by a quadrupole lens and a common large-diameter lens.
, (7G), (71?) in the horizontal and vertical directions can be explained by the differences in the horizontal and vertical focusing powers of the lenses provided on the cathode (KB), (KG), and (KR) sides with respect to the common large-diameter lens (1, EL). 3 electron beams (7B).

(7G) and (7R) are adjusted by two separate quadrupole lenses (FPLI) and (FPL2), and the common quadrupole lenses in the above embodiments are:
The direction of convergence and divergence is the opposite.

In this way, 3 electron beams (7B), (7G), (7R)
For each separate quadrupole lens (PPLI), (FPL
By providing 2), it is possible to adjust the difference in focusing between the center beam (redundant) and the pair of side beams (7B) and (7R). That is, each of the three horizontally long openings (31) and (3) shown in FIGS.
Regarding 2), by changing the shape of the central aperture and the shape of the apertures on both sides, the characteristics of the quadrupole lens for the center beam (7G) and the pair of side beams (7B),
The characteristics of the quadrupole lens for (7R) can be changed, thereby adjusting the difference in focusing between the center beam (7Gy) and the pair of side beams (7B) and (7R). By changing the strength of each quadrupole lens in synchronization with the deflection by the deflection yoke (8), deflection aberrations in the peripheral area of the phosphor screen (3) can be corrected, and the phosphor screen (3) A color picture tube device with good resolution can be obtained in all aspects.

Note that the electron gun (229) of this example also has a ninth hole in the aperture.
It is optional to provide a tongue as shown in the figure to form an aperture forming a quadrupole lens.

[Effects of the invention] A common large aperture composed of at least two grids through which the three electron beams commonly pass through the main lens of the electron gun of the color picture tube which emits three electron beams arranged in a row passing on the same plane. An electron lens is provided, and at least two grids each having a non-circular electron beam passing hole through which three electron beams commonly pass are provided on the side closer to the electron beam forming section than the common large-diameter electron lens, and have a diverging effect in the horizontal direction. ,
When a quadrupole lens that has a vertical focusing effect is provided, the quadrupole lens bends a pair of side beams in a direction that separates them from each other, and at the same time exerts a diverging effect on the pair of side beams more strongly than the center beam, resulting in a common The center beam and the pair of side beams can be appropriately focused and concentrated on the phosphor screen by the common large-diameter electron lens. As a result, the beam spot on the phosphor screen can be made smaller, resulting in a color picture tube device that displays a narrower image.

[Brief explanation of drawings]

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. The x-Z cross-sectional view and Y-2 cross-sectional view of the electron gun, and FIGS. 3(a) to 3(e) respectively show the aperture shapes of the electrodes in the electron gun, and FIGS. 4(a) to C) 5(a) to 5(d) are diagrams for explaining the action of the common large-diameter lens of the electron gun, and FIG. Figures (a) to e) are diagrams for explaining the effect that the apertures formed in the middle part of the eighth grid have on the characteristics of the common large-diameter lens, respectively, and Figures 7 (a) to C). 8 is a diagram for explaining the action of the quadrupole lens, and FIG. 8 is a diagram for explaining the divergence of the electron beam by the quadrupole lens.
Figures 9(a) and (b) are diagrams showing other aperture shapes for forming a quadrupole lens, respectively, and Figure 1O is a diagram showing the divergence characteristics of a quadrupole lens and the focusing characteristics of a common large-diameter lens. Diagrams for explaining adjustment, FIGS. 11(a) and (b)
are x-Z cross-sectional views and Y-axis cross-sectional views of electron guns of other embodiments, respectively
-Z cross-sectional view, FIGS. 12(a) and (b) are diagrams showing the aperture shape of the electrode in the electron gun, and FIG. 13(
14 to 18 are explanatory diagrams of a conventional color picture tube device, and FIG. A diagram showing the configuration of a color picture tube device, FIG. 15(a)
16(a) and (b) are diagrams for explaining the action of a common large-diameter lens in each electron gun, and FIGS. 16(a) and (b) are diagrams for explaining the action of an electron lens in different electron guns, respectively. , FIG. 17 is a diagram for explaining the action of a different electron gun on the electron beam, and FIG. 18 is a diagram showing the shape of the aperture of the electron gun. 3... Phosphor screen 7B... Center beams 7G, 7R... Pair of side beams 22... Electron gun 29, 30, 31, 32.
34... Opening Gl... First grid G2...
2nd grid G3...3rd grid G4...4th grid G5...5th grid G6...6th grid
Grid G7/7th grid G8...8th grid G9...9th grid H...Heater KB, KG
, KR...Cathode FPL...Quadrupole lens LEL
・・・Common large diameter lens

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 that pass on the same plane, consisting of a cathode and a plurality of grids, and three electrons emitted from this electron gun. The electron gun includes a deflection device that deflects the beam in horizontal and vertical directions, and a phosphor screen that displays an image by scanning the three electron beams deflected in the horizontal and vertical directions by the deflection device, and the electron gun In a color picture tube device having an electron beam forming section that forms a beam and a main lens section that focuses three electron beams emitted from the electron beam forming section onto the phosphor screen, the main lens section is A common large-diameter electron lens constituted by at least two grids through which the three electron beams commonly pass, and a common large-diameter electron lens that is closer to the electron beam forming section than the common large-diameter electron lens, and which allows the three electron beams to pass through in common. 1. A color picture tube device comprising a quadrupole lens having a diverging effect in the horizontal direction and a focusing effect in the vertical direction by at least two grids each having a non-circular electron beam passing hole through which the electron beam passes.