JPH03101036A - Color picture tube device - Google Patents

Abstract

PURPOSE:To obtain good resolution at the periphery of a display screen by specifying the ratio between opening diameters in the first and second directions of the first and second electrodes and the ratio between opening diameters in the second and first directions of intermediate electrodes respectively. CONSTITUTION:The ratio between opening diameters in the first direction and the second direction of the first electrode 10 and the second electrode 20 is set larger than 1.05 and smaller than 1.3, and the ratio between opening diameters in the second direction and the first direction of intermediate electrodes 70 and 80 is set larger than 1.05 and smaller than 1.3. Beams are focused in the state sufficiently near a true circle at various places on a screen, and strong focusing and diverging actions in the vertical direction are obtained. Electron beams can easily be radiated in the state near a true circle not only at the center section of the display screen but also at the periphery of the display screen with a simple structure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a color picture tube device of a multiple electron beam type in which a plurality of cathodes are arranged in a row.

(Prior Art) Currently, the mainstream color picture tube device is one using an in-line type electron gun in which three cathodes are arranged in a line within the electron gun. Then, to the electron beam emitted from the electron gun, a horizontal deflection magnetic field in the form of a bincussion is applied by a saddle-shaped coil, and a vertical deflection magnetic field in the shape of a barrel is applied by a toroidal coil, thereby causing the three electron beams to self-converge. There is.

In this text, the horizontal direction refers to the direction in which the cathodes are arranged, and the vertical direction refers to the direction perpendicular to the direction in which the cathodes are arranged and the direction in which the electron beam travels.

However, when the above-described deflection magnetic field is applied, the spot of the electron beam irradiated onto the screen becomes an ellipse having a long axis in the horizontal direction. This is noticeable at the periphery of the display screen, and reduces the resolution at the periphery of the display screen.

One possible way to solve this problem is to suppress the deformation of the electron beam due to the deflection magnetic field as much as possible by strongly focusing the electron beam in advance using a prefocus lens. However, in such a method, the cross-over diameter of the electron beam increases, so that the spot of the electron beam irradiated onto the screen becomes large, so that sufficient resolution cannot be obtained.

Another method is, for example, a color picture tube device described in Japanese Patent Laid-Open No. 64-38947. This color picture tube device has a quadrupole lens in which the main lens part for focusing the electron beam is separated into a focusing electric field and a diverging electric field by an intermediate electrode, and furthermore, the electron beam is focused in synchronization with the deflection of the electron beam. This changes the degree of vertical focusing. For example, when the electron beam is applied to the periphery of the display screen, the potential difference between the focusing electrode and the intermediate electrode is made smaller than when the electron beam is applied to the center of the display screen.

In this way, only the focusing effect of the electron beam, particularly in the vertical direction, can be independently weakened. Therefore, before the electron beam is irradiated into the deflection magnetic field, its divergence in the vertical direction is relatively strengthened. The electron beam becomes an ellipse with a long axis. By balancing the effect of vertically diverging the electron beam with the vertical overfocusing effect of the self-concentrating deflection magnetic field described above, the electron beam can be formed into a nearly perfectly circular shape even around the display screen. It was possible to get a spot.

(Problems to be Solved by the Invention) The above-mentioned color picture tube device was able to obtain extremely good resolution at the center of the display screen or at the periphery of the display screen, among the color picture tube devices conventionally considered. .

However, in recent years, there has been an increasing demand for color picture tube devices of 34 inches or larger. In such an ultra-large color picture tube device, it is necessary to apply a strong deflection magnetic field to the electron beam. There will be a need to take it. However, increasing the fluctuation in the potential difference between the focusing electrode and the intermediate electrode has problems such as generating an undesirable magnetic field within the electron gun or deteriorating the dynamic sensitivity. It has been difficult to sufficiently correct the shape of the irradiated electron beam spot.

The present invention was made in view of these problems, and is a color picture tube device that can provide good resolution not only at the center of the display screen but also at the periphery of the display screen, even in the case of an ultra-large color picture tube device. The purpose is to provide the following.

[Structure of the Invention] (Means for Solving the Problems) The color picture tube device of the present invention has a plurality of cathodes arranged in a row and formed in one-to-one correspondence with electron beams emitted from each cathode. A first electrode, an intermediate electrode, and a second electrode are sequentially arranged in the traveling direction of the electron beam with openings arranged so that the cathode is arranged on the side of the first electrode. 1
a focusing lens that acts strongly in a second direction perpendicular to the direction of the electron beam and the traveling direction of the electron beam;
An electron gun is provided with a main lens section in which a diverging lens that acts more strongly in a second direction than in the direction of A power supply means for generating a desired potential difference, a screen to which the electron beam is irradiated, a deflection means for deflecting the electron beam emitted from the electron gun in a first direction and a second direction, and a first electrode. A color picture tube device comprising an intermediate electrode or an adjusting means for adjusting the potential difference between the intermediate electrode and the second electrode, the color picture tube device comprising: an intermediate electrode or an adjusting means for adjusting the potential difference between the intermediate electrode and the second electrode; The ratio of the aperture diameters is greater than 1.05 and less than 1.3, and the ratio of the aperture diameters in the second direction and the first direction of the intermediate electrode is greater than 1.05 and less than 1.3. This is a characteristic feature.

(Function) As a result of various studies to solve the above problems, the inventors of the present invention separated and independent the anisotropic focusing electric field and the anisotropic diverging electric field of the main lens part, and further developed the main lens. By forming the apertures of the electrodes into a predetermined shape, it is possible to form larger lenses than in the past even if the potential difference between the electrodes is small.

That is, the main lens part constituting the color picture tube device of the present invention includes a first electrode, an intermediate electrode, and a second electrode each having an aperture formed in one-to-one correspondence with the electron beam emitted from the cathode. The shape of each aperture formed in the first electrode and the second electrode is such that the aperture diameter in the horizontal direction is larger than the aperture diameter in the vertical direction, and the electron beam formed in the intermediate electrode is The shape of the aperture for passage is such that the aperture diameter in the horizontal direction is smaller than the aperture diameter in the vertical direction.

Here, the operation of the present invention will be explained.

In the above configuration, by applying a desired voltage to each electrode, a predetermined potential difference is generated between the first electrode and the intermediate electrode, and between the intermediate electrode and the second electrode, and the electron lenses are separated and independent. can be formed.

Let's look at the first electrode of the electron lens, which is formed closer to the first electrode than the intermediate electrode of the main lens part.

A plurality of apertures corresponding to a plurality of electron beams are formed in the horizontal direction of the first electrode, and equipotential lines penetrating in the opposite direction to the intermediate electrode are formed within these apertures. The equipotential lines interfere with the equipotential lines penetrating into adjacent apertures, forming equipotential lines with small curvature and common to each aperture.

On the other hand, since a single opening is formed in the vertical direction of the first electrode, an equipotential line with a large curvature permeates in the opposite direction to the intermediate electrode. The equipotential line has a very large curvature compared to the curvature of the potential line. For this reason, on the first electrode side, a weak focusing effect can be obtained in the horizontal direction, and a strong focusing effect can be obtained in the vertical direction.

Next, looking at the intermediate electrode side of the electron lens, equipotential lines are formed in the horizontal apertures of the intermediate electrode that penetrate into the second electrode side within each aperture. The line is due to the influence of the equipotential line generated between the intermediate electrode and the second electrode,
They become equipotential lines with small curvature that do not interfere with each other.

Furthermore, an equipotential line with a small curvature that penetrates to the second electrode side is formed in the vertical aperture of the intermediate electrode, but in particular, the vertical aperture diameter of the intermediate electrode is smaller than the horizontal aperture diameter. Since it is relatively large, the equipotential line has a smaller curvature than the curvature of the horizontal equipotential line. For this reason, on the intermediate electrode side, a weak divergence effect is obtained in the horizontal direction, and an even weaker divergence effect is obtained in the vertical direction.

By causing the equipotential lines generated on the first electrode side and the intermediate electrode side to interact with each other, the electron lens formed on the first electrode side from the intermediate electrode has a focusing effect in the horizontal direction. Relatively, the focusing effect in the vertical direction can be further strengthened.

Similarly, on the side closer to the second electrode than the intermediate electrode, an electron lens with a weak diverging effect in the horizontal direction and an electron lens with a strong diverging effect in the vertical direction are formed.

As described above, the present invention forms the apertures of the first electrode and the second electrode so that the aperture diameter in the horizontal direction is larger than the aperture diameter in the vertical direction, and the shape of the aperture in the intermediate electrode is By forming the vertical aperture diameter larger than the horizontal aperture diameter, the electron lens formed closer to the first electrode than the intermediate electrode has a strong focusing effect in the vertical direction.
The electron lens formed on the second 0 electrode side has a strong diverging effect in the vertical direction. By combining such electron lenses, it is possible to configure a main lens portion that has relatively strong diverging and focusing effects in the vertical direction.

Therefore, with the above-described configuration, even if the potential difference between the first electrode and the intermediate electrode is slightly changed,
A large change in the focusing effect is observed in the vertical direction, which has not been seen in the past, and the present invention has been achieved by effectively utilizing such an effect.

For example, by combining a plurality of lenses around the main lens section described above, a perfectly circular beam spot is irradiated onto the center of the screen.

When the electron beam is deflected in the horizontal direction of the screen, the potential difference between the first electrode and the intermediate electrode is made smaller than when the electron beam is irradiated onto the center of the screen.

Then, the lens having a strong focusing effect in the vertical direction, which was formed especially on the first electrode side of the main lens part,
Since the potential difference between the first electrode and the intermediate electrode becomes smaller, the focusing effect becomes weaker. On the other hand, since the degree of divergence of the electron lens formed closer to the second electrode than the intermediate electrode does not change, the electron beam irradiated onto the screen is deformed into an elliptical shape with its long axis in the vertical direction. be done.

However, as described above, the greater the degree of deflection, the more the deflection magnetic field becomes overfocused in the vertical direction.

Therefore, the electron beam that is finally irradiated onto the screen is created by making the vertical focusing effect of the deflection magnetic field parallel to the vertical diverging effect of the electron gun. Even when the beam is deflected toward the periphery, a perfectly circular beam spot can be obtained.

In this way, for example, the larger the horizontal aperture diameter of the first electrode aperture is compared to the vertical aperture diameter, the more
Because it has a stronger focusing effect in the vertical direction than before,
Even if a strong deflection magnetic field is applied, the influence of deflection distortion caused by the deflection magnetic field can be corrected in a sufficient amount of time.

By the way, in practice, there is a design limit to increasing the horizontal aperture diameter of the first electrode or the second electrode, and the vertical aperture diameter of the intermediate electrode, so the vertical aperture diameter or By reducing the horizontal opening diameter, it is possible to relatively increase the ratio of vertical opening diameter/horizontal opening diameter and horizontal opening diameter/vertical opening diameter.

However, if such a method is adopted, for example, the effective area of the aperture in the first electrode becomes small, so although the relative vertical focusing effect becomes large, the actual focusing effect becomes small. , the focusing action is no longer sufficient to focus the beam onto the screen.

Therefore, the present inventors have found through various experiments that when the ratio of the vertical aperture diameter/horizontal aperture diameter of the apertures of the first electrode and the second electrode exceeds 1.3, the effective aperture It has been found that the diameter becomes too small and the necessary focusing effect cannot be obtained.

On the other hand, the ratio of vertical opening diameter/horizontal opening diameter is 1
．． It has been found that if it is less than 0.05, a relatively large focusing effect cannot be obtained and sufficient dynamic sensitivity cannot be obtained.

For example, FIG. 6 shows the ratio of the vertical aperture/horizontal aperture diameter of the electrode apertures on the horizontal axis, and the dynamic sensitivity and the effective diameter of the apertures on the vertical axis.

For this reason, the ratio of the vertical aperture diameter/horizontal aperture diameter of the apertures of the first electrode and the second electrode is preferably 1.05 or more and 1.3 or less.
The beam is focused in a sufficiently close to perfect circle at various locations on the screen.

Considering the same, the ratio of horizontal hole diameter/vertical hole diameter of the holes in the intermediate electrode is preferably 1.05 or more, 1.
By setting it to 3 or less, even stronger focusing/diverging effects can be obtained in the vertical direction.

(Example) Embodiment 3 of the color picture tube device of the present invention will be described below. 4 will be explained with reference to the drawings.

FIG. 1 shows a schematic cross-sectional view of an electron gun used in the color picture tube device of this embodiment, in which (a) is a schematic horizontal cross-sectional view of the electron gun, and (b) in the figure FIG. 2 is a schematic vertical cross-sectional view of an electron gun.

This electron gun (3) has a built-in heater (not shown), and -
Three cathodes arranged in a row (5a), (5b), (
5c), a first electrode (lO), a second electrode (20),
Third electrode (30), fourth electrode (40), fifth electrode (5o), plural intermediate electrodes (70), (80), sixth electrode
The electrode (6o) and the convergence cup (90) are arranged in this order. In the vicinity of this electron gun (3), there is a resistor (120) connected to a third operating power supply device (110) as shown in FIG. 1(b).
is installed, and one end (12
0a) is connected to the sixth electrode (60), and the other end (120b) is grounded. Further, an intermediate electrode (70) is provided at a predetermined location within this resistor (120).

(80) is connected.

The first electrode (10) is a thin plate-shaped electrode that is grounded.
Round hole-shaped aperture (1
0a), (10b), and (10c) are formed.

The second electrode (20), like the first electrode (lO),
Round hole-shaped aperture for passing three electron beams (
20a), (20b) and (20c), which are connected to a first operating power supply (101) to which a DC voltage is applied.

The third electrode (30) is two cup-shaped electrodes (31).

The open wires of (32) are butted together, and the second electrode (2
The cup-shaped electrode (31) on the 0) side has a second electrode (20
) formed in the openings (20a), (20b),
(20c) A round hole-shaped opening (31a),
(31b), (31c) are formed, and on the fourth electrode (40) side, large diameter round hole-shaped openings (32a), (
32b) and (32c) are formed. and,
This third electrode is connected to a second operating power supply (10B) to which an alternating current voltage is applied.

Similarly to the third electrode (30), the fourth electrode (40) also has two
The open wires of cup-shaped electrodes (41) and (42) are butted together, and each has a large-diameter opening (41a),
(41b).

(41c), (42a), (42b), (42
c) is attached and, like the second electrode (20), is connected to the first operating power supply (101) 5.

The fifth electrode (50) includes four cup-shaped electrodes (51).

(52), (53), and (54), including a cup-shaped electrode (51) and a cup-shaped electrode (52).
), the open wires of the cup-shaped electrode (53) and the cup-shaped electrode (54) are butted against each other, and are further arranged in series.

These cup-shaped electrodes (51), (52), (53), (
54) also have large diameter holes (41a) and (41b), respectively.
, (41c), (42a), (42b)
.

(42c), (43a), (43b), (43c),
(44a), (44b), and (44c) are formed. The cup-shaped electrode (44) on the middle electrode (70) side
The openings (44a), (44b), and (44c) have an elliptical shape in which the horizontal opening diameter is longer than the vertical opening diameter, and the horizontal opening diameter/vertical opening diameter is 1.1.
It is formed so that

The intermediate electrodes (70), (80) are thick plate electrodes with large diameter openings (70a), (70b), (70c),
(80a), (80b), (80c) are attached, and these openings (70a), (70
b), (70c).

(80a), (80b), and (80c) are formed in an elliptical shape in which the horizontal hole diameter is shorter than the vertical hole diameter, and the vertical hole diameter/horizontal hole diameter is 1.15. 6.

The sixth electrode (60) has four electrodes similar to the fifth electrode (50).
cup-shaped electrodes (81), (82), (63
), (64), and similarly to the fifth electrode (50), the opening ([1l
a), (Blb), and (131c) have an elliptical shape in which the horizontal hole diameter is longer than the vertical hole diameter, and are formed so that the horizontal hole diameter/vertical hole diameter is 1.2. has been done.

A cup-down type m constituting the sixth electrode (60)
A convergence cup (90) is fixed to the bottom of (84).

The electron gun (3) having such a configuration is installed in a glass bulb (not shown) on which a screen (not shown) is formed. A shadow mask (not shown) is installed between the electron gun (3) and the screen, and a deflection yoke (not shown) is installed around the bulb (not shown) to form a color picture tube device. is configured.

Next, the electron gun (3
) operation will be explained.

A DC voltage of, for example, 150 V and a modulation signal corresponding to the image to be displayed are applied to the 7 8 cathodes (5a), (5b), and (5c). Then, by grounding the first electrode (10) and applying a voltage of eoov to the second electrode (20), electron beams are irradiated from the cathodes (5a), (5b), and (5c), and Cathode (5a), (5b
), (5c), first electrode (10), second electrode (
20) causes each of the three electron beams to cross over.

In addition, the third electrode (30) and the fifth electrode (50) have 7
A voltage of KV is applied, and a voltage of 600 cm is applied to the fourth electrode (40).
A voltage of 25 to 30 is applied to the sixth electrode (60).
Apply a voltage of kV. Then, a prefocus lens is formed by the potential difference between the second electrode (20) and the third electrode (30), and between the third electrode (30) and the fourth electrode (40), and each electron beam is prefocused. and the fifth electrode (5
0).

The voltage from the third operating voltage supply device (110) is applied to the sixth electrode (60), and the voltage from the third operating voltage supply device (110) is applied to the first intermediate electrode (70).
0), 40% of the voltage is applied to the second intermediate electrode (80).
is supplied with 65% of the voltage. In this way,
Fifth electrode (50), intermediate electrode (70), (80)
, the sixth electrode (60) forms a main lens that ultimately focuses the electron beam onto the screen.

Next, this fifth electrode (50) and the intermediate electrode (70).

(80) The operation of the main lens formed by the sixth electrode (80) will be explained with reference to FIG.

Figure 2 schematically shows the equipotential distribution of this main lens part, where (a) is a cross-sectional view taken along the horizontal direction, and (b) is a cross-sectional view taken along the vertical direction. This figure shows a cross-sectional view.

First, with reference to FIG. 2(a), consider the action of the main lens section in the horizontal direction. Since there is a predetermined potential difference between the fifth electrode (50) and the first intermediate electrode (70), the fifth electrode (50), (7), the openings (54a), (5
4b).

(54c) includes equipotential lines (55) penetrating each;
A common equipotential line (56) with a small curvature is generated within the cup-shaped electrode (54) formed by interference of each equipotential line (55).
) occurs. In particular, these openings (54a) and (54b
), (54c) have a large opening diameter in the horizontal direction, so the openings (54a), (54b), (
The equipotential line 9 (55) penetrating into the cup-shaped electrode (54) interferes, and the common equipotential line (56) with small curvature occurring within the cup-shaped electrode (54) increases. Also,
The first intermediate electrode (70) has apertures (70a), (70b), (70c) having large aperture diameters in the vertical direction.
) are formed, but the openings (70a) and (70b
), (70c) each equipotential line (75) penetrates into the first intermediate electrode (70) through the aperture (70a).

(70b) and (70c) are formed sufficiently thick compared to the horizontal opening diameter, and each equipotential line (75) interferes with the influence from the second intermediate electrode (80). There is no. In this example, the thickness of the intermediate electrode is such that the equipotential lines (75) do not interfere with each other.
It was made thicker than 172 of the vertical openings 70a), (70b), and (70c).

Therefore, the fifth electrode (54) and the first intermediate electrode (70
) can be regarded as a very small focusing lens as a whole.

Similarly, the second intermediate electrode (80) and the sixth electrode (60)
In the horizontal electron lens formed by 0, it can be seen that a very small diverging lens is formed.

That is, it can be considered that a small converging lens and a small diverging lens are formed in the horizontal direction of the main lens.

Next, with reference to FIG. 2(b), the action of the main lens portion in the vertical direction will be considered. Since there is a predetermined potential difference between the fifth electrode (50) and the first intermediate electrode (70), the three openings (54a), (54b), and (54c) have the following:
Each opening (54a>, (54b), (54c)
Equipotential lines (58) are generated that penetrate into the interior. In particular, the apertures (54a) and (54b).

The vertical opening diameter of (54c) is the same as that of the first intermediate electrode (7
0) openings (70a), (70b), (70c
), it can be seen that a large focusing lens is formed as a whole.

Similarly, the second intermediate electrode (80) and the sixth electrode (60)
It can be seen that an extremely large diverging lens is formed in the electron lens constructed by .

That is, it can be considered that a large converging lens and a large diverging lens are formed in the vertical direction of the main lens.

Therefore, for example, when irradiating an electron beam to the center of the screen, as shown in Figure 3(a), in the horizontal direction, a combination of a small converging lens and a small diverging lens is used to
The electron beam is focused onto the screen, and in the vertical direction, as shown in FIG. 3(b), the electron beam is focused onto the screen by a combination of a large converging lens and a large diverging lens.

In this way, when there is no influence of the deflection magnetic field, the electron beam is focused and irradiated onto the center of the screen in a perfect circle.

Next, when irradiating the periphery of the screen with an electron beam,
Compared to when irradiating the center of the screen, the fifth electrode (50
) is increased, and the potential difference between the fifth electrode (50) and the first intermediate electrode (70) is decreased.

Then, in the horizontal direction, as shown in Fig. 4(a), the fifth
The small focusing lens formed by the electrode (50) and the first intermediate electrode (70) slightly weakens the focusing, but does not significantly change the shape of the electron beam.

On the other hand, in the vertical direction, as shown in FIG. 4(b), the focusing effect of the focusing lens formed by the fifth electrode (50) and the first intermediate electrode (70) is strong in the vertical direction. As shown in FIG. 4(b), the size becomes significantly smaller. On the other hand, the second intermediate electrode (80) and the sixth electrode (6
Since the strongly vertically divergent lens formed by 0) does not change, the vertically divergent lens is relatively strengthened,
This results in an electron beam having a long axis in the vertical direction.

However, the electron beam emitted from the electron gun (3) has
Since the electron beam is strongly focused in the vertical direction due to the influence of the deflection magnetic field, the electron beam is compressed in the vertical direction, and a roughly circular electron beam spot is obtained on the screen.

For example, in order to operate the fifth electrode (50) as described above, it is sufficient to apply a dynamic voltage synchronized with the deflection voltage as shown in FIG. 6, for example. This dynamic voltage is assumed to be Ov when the deflection voltage is OV, and increases as the absolute value of the deflection voltage increases. As a result, as the deflection magnetic field acting on the electron beam becomes larger, the potential difference between the fifth electrode (50) and the first intermediate electrode (70) is reduced, and the vertical divergence of the electron beam is strengthened. A circular beam spot is obtained.

As detailed above, the color picture tube device of this embodiment is
Even in a color picture tube device with a large display screen, the fifth
Electrode (50), sixth electrode (BO) and intermediate electrode (70)
, (80), it is possible to form a large lens combination. Therefore, the degree of vertical focusing of the electron beam can be significantly changed without significantly changing the potential difference between the fifth electrode (50) and the intermediate electrode (70). For this reason,
High resolution can be obtained by obtaining a perfectly circular beam spot not only at the center of the screen but also at the periphery.

By reducing the fluctuation in the potential difference between the fifth electrode (50) and the intermediate electrode (70), power consumption is suppressed, and there is no generation of undesirable magnetic fields caused by fluctuations in the potential difference, and the electron The beam can be irradiated onto the screen.

Here, two intermediate electrodes (70) and (80) are provided between the fifth electrode (50) and the sixth electrode (60) forming the main lens part.
Although a plurality of intermediate electrodes may be interposed. By increasing the number of intermediate electrodes,
A focusing lens formed by the fifth electrode (50) and the intermediate electrode (70), and the intermediate electrode (80) and the sixth electrode (60)
It is possible to reduce interference with a diverging lens constituted by.

In this example, the opening (54a) of the fifth electrode (50).

(54b), (54e) and the opening (61) of the sixth electrode.
a), (131b).

The ratio of the horizontal aperture diameter/vertical aperture diameter of (81c) was made different, and this is the aperture (81a) of the sixth electrode (60) where the electron beam is located on the high potential side.

The openings (54a) and (54) of the fifth electrode (50) are located on the lower potential side compared to (Blb) and (Blc).
This is because it is strongly influenced by (54c).

Therefore, for example, as shown in FIG.
) openings (54a), (54b), (54c)
By installing a pair of vertically opposed plate members (130) in the open 5 6 holes (61a), ([1lb), and (61c) of the fifth electrode (50), Opening hole (54a),
(54b), (54c) and the ratio of the horizontal aperture diameter/vertical aperture diameter of the apertures (81a), (Blb), (81c) of the sixth electrode (60) can be made the same. The upper part of this pair of opposing plates +4' (130
) is, for example, the opening (54a) of the fifth electrode (50),
In (54b) and (54c), the equipotential line (58) is prevented from expanding only in the vertical direction, and a stronger focusing effect can be obtained. This depends on the length l of the plate member (180); for example, the longer the length l, the stronger the focusing effect can be at the fifth electrode (50).
Further, the sixth electrode (60) can strengthen the divergence effect.

Therefore, by appropriately selecting the length l of the plate member (taO) to be installed on the fifth electrode (50) side and the sixth electrode (60) side, the opening (54a ),
(54b).

(54c) and the opening of the sixth electrode (Bla), (Blb
), (elc) can have the same ratio of horizontal aperture diameter/vertical aperture diameter.

Furthermore, in this embodiment, by varying the voltage applied to the fifth electrode (50), the degree of focusing of the focusing lens formed by the fifth electrode (50) and the first intermediate electrode (70) can be adjusted. However, it is also possible to change the voltage of the first intermediate electrode (70). but,
The change in the voltage of the first intermediate electrode (70) causes the change in the voltage of the first intermediate electrode (70) to
), it is preferable to vary the voltage of the fifth electrode (50) when the number of intermediate electrodes is small.

[Effects of the Invention] As detailed above, the color picture tube device of the present invention has a simple configuration and can easily emit an electron beam in a perfect circle not only at the center of the displayed image but also at the periphery of the displayed image. This made it possible to irradiate in close conditions.

Therefore, the present invention is particularly suitable for large-sized color picture tube devices, and enables high resolution.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view of an electron gun according to an embodiment of the color picture tube device of the present invention, in which (a) is a horizontal cross-sectional view, and (b) is a vertical cross-sectional view. The plan view and FIG. 2 are schematic diagrams showing the equipotential distribution of the main lens portion of this example, in which (a) is a horizontal cross-sectional view, and (b) is a vertical cross-sectional view. 3 and 4 are optical model diagrams showing the operation of the lens section of this example, in which (a) is a schematic diagram in the horizontal direction, (b) is a schematic diagram in the vertical direction, and (b) is a schematic diagram in the vertical direction. FIG. 5 is a characteristic diagram for explaining the driving of the color picture tube device of this embodiment, in which (a) is a current characteristic diagram, (b) is a voltage characteristic diagram, and FIG. 6 is a characteristic diagram of the present invention. A diagram showing the relationship between the ratio of the horizontal aperture diameter/vertical aperture diameter of the apertures formed in the electrode, dynamic sensitivity, and lens effective diameter. It is a schematic sectional view of a member. (3)... Electron gun (5)... Cathode (50)... Fifth electrode (55)... Plate member (60)... Sixth electrode (70), (80). ...Intermediate electrode (110)...Third operating power supply device 8 (120)...Resistor (130)...Plate-shaped member

Claims (1)

[Claims] a plurality of cathodes arranged in a line, a first electrode, an intermediate electrode having openings formed in one-to-one correspondence with the electron beams emitted from each of the cathodes, and extending in the traveling direction of the electron beams; The second electrodes are arranged in sequence, and compared to the first direction in which the cathodes are arranged on the first electrode side, a second direction perpendicular to each of the first direction and the traveling direction of the electron beam is arranged. A main lens portion including a converging lens that acts strongly in the direction and a diverging lens that acts strongly in the second direction on the second electrode side compared to the first direction are separated by the intermediate electrode. an electron gun; a power supply means for generating a desired potential difference between the first electrode and the intermediate electrode or between the intermediate electrode and the second electrode; a screen on which the electron beam is irradiated; a deflecting means for deflecting the emitted electron beam in the first direction and the second direction; and adjusting the potential difference between the first electrode and the intermediate electrode or between the intermediate electrode and the second electrode. A color picture tube device comprising: an adjusting means for adjusting the first
The ratio of the opening diameters in the first direction and the second direction of the electrode and the second electrode is greater than 1.05 and smaller than 1.3, and 1st
A color picture tube device characterized in that the ratio of the aperture diameters in the direction is larger than 1.05 and smaller than 1.3.