JPH11176350A - Color picture tube device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deterioration of an electron beam spot and resolution by aberration and to provide a dynamic focus electron gun with high focus quality, by providing a multi-pole lens forming means to compensate deflected aberration the first and second electrodes. SOLUTION: In this electron gun 21, an electron beam generating part GE to form an electron beam by controlling electron discharge and by accelerating and focusing the electron discharged from a cathode K by a cathode K and first - third grids G1 -G3 is formed. A main electron lens part ML to focus an electron beam on a phosphor screen by the third - seventh grids G3 -G7 is formed. In the main electron lens part ML, a multi-pole lens QL is formed between the fifth grid G5 with a longitudinal electron beam passing hole formed and the sixth grid G6 with a lateral electron beam passing hole formed, and a final focus lens EL is formed between the sixth grid G6 and the seventh grid G7 .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color picture tube device and, more particularly, to a dynamic focus type color picture tube device for correcting deflection aberration caused by a magnetic field generated by a deflection yoke.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 6, a color picture tube device has an envelope comprising a panel 1 and a funnel 2 integrally joined to the panel 1, and an inner surface of the panel 1 has Stripes emitting blue, green, and red light, or
Phosphor screen 3 composed of a dot-shaped three-color phosphor layer
A (target) is formed, and a shadow mask 4 having a large number of apertures formed therein is mounted opposite the phosphor screen 3. Meanwhile, funnel 2
An electron gun 7 that emits three electron beams 6B, 6G, 6R is disposed in the neck 5 of FIG. A deflection yoke 8 is mounted outside the funnel 2. Then, the three electron beams 6B, 6G, and 6R emitted from the electron gun 7 are deflected by the horizontal and vertical deflection magnetic fields generated by the deflection yoke 8, and the phosphor screen 3 is horizontally and vertically scanned through the shadow mask 4. Thus, a structure for displaying a color image is formed.

In such a color picture tube device, in particular, the electron gun 7 is arranged in a row of a center beam 6C and a pair of side beams 6B and 6R passing on the same horizontal plane.
An in-line type electron gun that emits electron beams 6B, 6G, and 6R is used. On the other hand, a horizontal deflection magnetic field generated by the deflection yoke 8 is a pincushion type, and a vertical deflection magnetic field is a barrel type.
A self-convergence type in-line type color picture tube device for self-concentrating the three electron beams 6B, 6G, 6R arranged in a line has been widely put to practical use.

Normally, the electron gun 7 controls the emission of electrons from the cathode, and focuses the emitted electrons to form three electron beams 6B, 6G, 6R, and a plurality of adjacent cathodes from the cathode. It has an electron beam generating section composed of electrodes, and a main electron lens section composed of a plurality of electrodes for focusing the three electron beams 6B, 6G, 6R obtained from the electron beam generating section on the phosphor screen 3. .

[0005] In such a color picture tube device, in order to improve the image characteristics on the phosphor screen 3,
Three electron beams 6B, 6G, 6R emitted from the electron gun 7
Must be properly focused. However, unlike the self-convergence type in-line color picture tube device, the horizontal deflection magnetic field for deflecting the three electron beams 6B, 6G, 6R emitted from the electron gun 7 is a pincushion type, and the vertical deflection magnetic field is a barrel type. Assuming a uniform magnetic field, the electron beams 6B, 6G, 6R receive astigmatism. For example, a pincushion-type horizontal deflection magnetic field will be described. As shown in FIG.
B, 6G, 6R) are pincushion-type horizontal deflection magnetic fields 1
0 receives the force in the directions of arrows 11H and 11V, and FIG.
As shown in (b), the beam spot 12 of the electron beam on the peripheral portion of the phosphor screen is greatly distorted due to the deflection aberration. The deflection aberration of the electron beam occurs because the electron beam is over-focused in the vertical direction, and a large halo 13 (bleeding) occurs in the vertical direction. The deflection aberration that this electron beam receives is
The larger the tube and the wider the angle of deflection, the larger the size of the tube, and the resolution around the phosphor screen is significantly deteriorated.

JP-A-61-99249, Kaisho 61
JP-A-250934 and JP-A-2-72546 disclose electron guns for solving the deterioration of resolution due to the above-mentioned deflection aberration. The electron guns disclosed in these publications are basically formed in a structure shown in FIG. That is, each of the first to fifth grids G1 to G1
G5, an electron beam generator GE, a quadrupole lens QL, and a final focusing lens EL along the traveling direction of the electron beam.
Is formed. The quadrupole lens QL of each of the electron guns has three non-circular electron beam passage holes 14a and 14c shown in FIGS. 8B and 8C on the opposing surfaces of the third and fourth grids G3 and G4. 14b, 14c, 15a, 15
b, 15c.

FIG. 9 shows equivalent correction of deflection aberration by the electron gun using an optical lens. That is, the electron gun is a dynamic focus type electron gun that sequentially forms a quadrupole lens QL and a final focusing lens EL in the direction of the phosphor screen from the cathode K, and the electron beam 6 from the cathode K is applied to the phosphor screen 3. When there is no deflection in the center, the third grid and fourth
The potential of the grid is made almost the same, and the quadrupole lens QL is hardly actuated.
Is appropriately focused on the center of the phosphor screen 3 by the final focusing lens EL. On the other hand, at the time of deflection, the potential of the fourth grid is raised to form a quadrupole lens QL as shown by a broken line, and diverges in the vertical direction and converges in the horizontal direction, and at the same time, the vertical , Weakens the focusing action in both horizontal directions. As a result, the electron beam 6 is insufficiently focused in the vertical direction, but is subjected to a focusing action by deflection aberration (astigmatism) and is appropriately focused. On the other hand, in the horizontal direction, the focusing action of the quadrupole lens QL and the final focusing lens E
Due to the reduction of the focusing effect of L, the overall focusing in the horizontal direction hardly changes, and is slightly underfocused by the magnetic field generated by the deflection yoke 8. However, the peripheral portion of the phosphor screen 3 where the electron beam 6 reaches is farther away from the electron gun than the central portion, so that it is appropriately focused even in the horizontal direction.

As described above, a color picture tube apparatus which deflects three electron beams arranged in a row in a row by an asymmetric magnetic field generated by a deflection yoke receives astigmatism by the asymmetric magnetic field and generates a fluorescent light. The beam spot around the body screen is distorted. The deflection aberration received by the electron beam increases as the size of the tube increases and as the deflection angle increases, and the resolution around the phosphor screen deteriorates significantly. As an electron gun for solving this deterioration in resolution, a dynamic focus system in which electrodes are formed of first to fifth grids and an electron beam generator, a quadrupole lens, and a final focusing lens are sequentially formed in the direction from the cathode to the phosphor screen. An electron gun has been proposed.

However, in such a dynamic focus type electron gun, two intermediate voltages of about 5 to 10 kV must be supplied to the third grid and the fourth grid from outside the tube. Withstand voltage becomes a problem. In addition, the connection line for applying a predetermined voltage to each electrode becomes longer, the withstand voltage in the tube is reduced, and the focusing characteristics of the electron beam due to discharge, leak current, etc. are deteriorated.
There is a problem of impairing the performance and reliability of the color picture tube device, and driving the color picture tube to supply two intermediate potentials from outside the color picture tube to the inside of the tube,
An extra load is also applied to the device. Another dynamic type electron gun that solves such a problem has been proposed.

In this dynamic type electron gun, FIG.
0, the plurality of electrodes of the electron gun are connected to the first to seventh electrodes.
A high voltage is applied to the seventh grid of the first to seventh grids, and a voltage of a voltage that changes in synchronization with the deflection of the electron beam to a DC voltage lower than the high voltage is applied to the sixth grid. A superimposed dynamic voltage is applied and the fifth grid is connected to the sixth grid via a resistor arranged in the tube, and the fifth grid is connected to the fifth grid via a resistor and a capacitance between the sixth grid. To apply a voltage that changes in synchronization with the dynamic voltage of the sixth grid.
A voltage lower than the voltage of the fifth grid is applied to the grid, and a multipole lens for correcting the deflection aberration is formed in the focusing lens area of the main electron lens portion by the fifth and sixth grids as shown in FIG. Further, a capacitance C between an electrode to which the dynamic voltage is applied and an electrode disposed adjacent to the electrode and connected via a resistor,
If the resistance value R of the resistor, the frequency fH of the dynamic voltage synchronized with the horizontal deflection, and the frequency fV of the dynamic voltage synchronized with the vertical deflection are set to satisfy the relationship of π ² fHCR ≧ 13/2, the period during which the electron beam is horizontally deflected is obtained. , R >> 1 / (2πfHC), and when a voltage 34 is applied to the first electrode (or the sixth grid) as shown in FIG. 13, the second electrode (or the fifth grid) FIG. 13 shows that the dynamic voltage is divided and reduced via the capacitance C between the electrodes to
Is applied to the second electrode (or the fifth electrode).
Grid). As a result, the first
Electrode (sixth grid) and second electrode (fifth grid)
Is to correct astigmatism caused by a horizontal deflection magnetic field of an electron beam by forming a multipole lens formed by first and second electrodes (fifth and sixth grids) due to a potential difference. At this time, this electron gun is represented by an equivalent circuit as shown in FIG. 12. As a result, the astigmatism of the deflecting magnetic field can be reduced by simply supplying one intermediate voltage from outside the tube to the electron gun. This makes it possible to provide a high-performance color picture tube device with high reliability over the entire screen, excellent withstand voltage characteristics, and high reliability.

However, with such a configuration,
The multipole lens formed between the G5 electrode and the G6 electrode is:
As shown in FIG. 13, the potential difference generated between the electrodes G5 and G6 is originally only about half (1/2 Vd) of the supplied voltage Vd.
This must be compensated for by increasing the strength of the multipole lens formed between the electrode and the G6 electrode.

More specifically, the shape of the electrode opening on the G6 side of the G5 electrode as shown in FIG.
a) H direction diameter, G6 electrode G5 side opening shape (FIG. 1)
It is necessary to increase the strength of the quadrupole lens formed between these electrodes by decreasing the diameter in the V direction of 1b).

However, if the size of the electron beam passage hole becomes much smaller than the conventional one, the size of the electron beam when the electron beam passes through the portion becomes smaller than the opening diameter of the electron beam passage hole. It becomes relatively large, and it is easy to pick up the aberration component of the auxiliary multipole lens formed between the G5 and G6 electrodes due to the penetration voltage caused by the main lens and the electric field generated between the G5 and G6 electrodes. As a result, the lens aperture of the main lens between the G6 and G7 electrodes is reduced.

More specifically, the quadrupole lens formed between the G5 electrode and the G6 electrode reduces the dynamic voltage,
Alternatively, it is desirable that they are close to each other in view of the magnification of the quadrupole lens and the main lens.
And the penetration voltage region of the main lens formed between the G7 electrodes reaches the quadrupole lens portion (G5 and G6 electrodes).

At this time, if the opening diameter of the electrode forming the quadrupole lens is smaller than the opening diameter of the electron beam passage hole between the G6 electrode and the G7 electrode, as shown in FIG.
7, the penetration voltage 36 of the main lens formed between the G5 electrode and the G6 electrode is affected by the electrode opening between the G5 electrode and the G6 electrode.
Between the electrode and the G6 electrode due to the potential difference between them.
An auxiliary multipole lens is formed by a main lens penetration voltage different from the pole lens. Due to this penetration voltage, the smaller the aperture of the electrode between the G5 electrode and the G6 electrode, the smaller the aperture of the lens and the greater the lens aberration. For this reason, not only the periphery of the screen but also the entire area including the center of the screen causes deterioration of the electron beam, thereby deteriorating the resolution.

[0016]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a dynamic focus type electron gun capable of preventing deterioration of an electron beam spot and deterioration of resolution and having a higher focus quality. It is intended to obtain a color picture tube having the following.

[0017]

According to the present invention, an electron having a main electron lens portion formed by a plurality of electrodes for focusing at least one electron beam emitted from an electron beam generating portion on a target. In a color picture tube device having at least a gun and a deflection yoke that generates a magnetic field for deflecting and scanning an electron beam emitted from the electron gun onto a target, the main electron lens unit of the electron gun includes:
An electrode to which at least an anode high voltage is applied, and first to fifth electrodes arranged from a screen side to a cathode side, wherein the electron beam is deflected to a medium DC voltage lower than the anode high voltage. A first electrode forming a converging lens region for applying a dynamic voltage in which a voltage that changes in synchronization is superimposed; and a resistor disposed in the tube adjacent to the first electrode on the side of the electron beam generating portion of the first electrode. A second electrode connected to the second electrode, a fourth electrode connected to the second electrode, and a third electrode to which a different DC voltage is supplied independently of the first, second and fourth electrodes. And a fifth electrode, wherein a multipole lens forming means for correcting deflection aberration is provided between the first and second electrodes.

Further, according to the present invention, in the above-mentioned color picture tube, the fifth electrode to which a dynamic voltage is applied and the fifth electrode arranged adjacent to the fifth electrode and connected via a resistor. When the electrostatic capacitance C between the electrodes 4 and 4, the resistance value R of the resistor, the frequency fH of the dynamic voltage synchronized with the horizontal deflection, and the frequency fV of the dynamic voltage synchronized with the vertical deflection are pi. A color picture tube device is provided, wherein π ² fHCR ≧ 13/2.

In the above configuration, the low-pass
The equivalent circuit of the filter (Low Pass Filter) has the circuit configuration shown in FIG. At this time, each capacitance C2-3,
C3-4, C4-5, and C5-6 are slightly different depending on the gap between the electrodes and the area of the electrode-facing surface. If all of them have the same capacitance, (C23 = C34 = C
45 = C56) The superimposed voltage (ed) of the G5 electrode portion is 1/4 V
d. The dynamic voltage supplied to the G6 electrode is
Assuming that Vd is present, in the configuration of FIG.
While the potential difference between the six electrodes can only be Ｖ Vd,
In the present invention, 3/4 Vd can be generated as a potential difference, and accordingly, it is not necessary to reduce the electrode opening diameter for forming a quadrupole lens between the G5 electrode and the G6 electrode as described above.

As a result, it is possible to increase the diameter of the electrode opening in this portion, and it is possible to reduce the aberration component received by the multipole lens by the quadrupole lens portion and the main lens penetration voltage. In addition, it is possible to obtain a dynamic focus electron gun having high focus performance over the entire screen by preventing deterioration due to aberration of the electron beam spot.

In other words, in this color picture tube, a single resistor is provided in the electron gun, and a low-pass filter (Low) formed in the electron gun by the resistor R and the capacitance C between the electrodes. Pass Filter) is formed, and the drawback of the dynamic focus system using the quadrupole lens operated by this, namely, the 4 points between the G5 electrode and the G6 electrode.
The problem is that the aperture diameter of the quadrupole lens is reduced due to the disadvantage that the potential difference generated between the pole lenses is supplied only about half of the voltage supplied to the G6 electrode, and the aberration component of the quadrupole lens increases due to this problem. The deterioration of the electron beam spot and the deterioration of the resolution due to the increase in the aberration component of the auxiliary multipole lens formed between the G5 electrode and the G6 electrode due to the main lens penetration voltage can be prevented. This allows
A color picture tube having a dynamic focus type electron gun with higher focus quality can be obtained.

[0022]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 3 shows a color picture tube device according to an embodiment of the present invention. This color picture tube device has an envelope composed of a panel 1 and a funnel 2 integrally joined to the panel 1, and the inner surface of the panel 1 has three stripes of colors emitting blue, green and red light. A phosphor screen 3 (target) made of a phosphor layer is formed, and a shadow mask 4 having a large number of apertures is mounted inside the phosphor screen 3 so as to face the phosphor screen 3. On the other hand, in the neck 5 of the funnel 2, the three electron beams 20B, 20G,
An electron gun 21 that emits 20R is provided. A deflection yoke 8 is mounted outside the funnel 2. The three electron beams 20 emitted from the electron gun 21
B, 20G and 20R are deflected by the horizontal and vertical deflection magnetic fields generated by the deflection yoke 8, and the phosphor screen 3 is horizontally and vertically scanned through the shadow mask 4, whereby:
It is formed in a structure for displaying a color image.

As shown in FIG. 1, the electron gun 21 includes three cathodes K arranged in a row in the horizontal direction (H-axis direction), a heater H for individually heating these cathodes K, and a predetermined number of cathodes sequentially from the cathodes. There are first to seventh grids G1 to G7 arranged in the phosphor screen direction with an interval therebetween. The fifth grid G5 (second electrode) and the sixth grid G6 (first electrode) are electrically connected via a resistor 22 disposed in the tube.

The first and second grids G1, G2 are:
It is composed of a plate-like electrode, and three relatively small, substantially circular electron beam passage holes are provided in a row on the plate surface corresponding to the three cathodes K.

Third, fourth, fifth, and sixth grids G3, G
4, G5 and G6 are each formed of a cylindrical electrode, and the surface of the third grid G3 facing the second grid G2 is 3
Three substantially circular electron beam passage holes, which are larger than the electron beam passage holes of the second grid G2, are provided in one row corresponding to the cathodes K. Also, the surface of the third grid G3 facing the fourth grid G4, the fourth grid G
4. On the surface of the fifth grid G5 facing the fourth grid G4 and on the surface of the sixth grid G6 facing the seventh grid G7, the second grid of the third grid G3 corresponds to the three cathodes K, respectively. Three substantially circular electron beam passage holes larger than the electron beam passage holes on the surface facing G2 are provided in a line. Further, the fifth grid G5
As shown in FIG. 2 (a), three electron beams passing through the three cathodes in a substantially vertically long direction having a major axis in the vertical direction (V-axis direction) on the surface facing the sixth grid G6. Hole 24
a, 24b and 24c are provided in a line. On the other hand, on the surface of the sixth grid G6 facing the fifth grid G5, as shown in FIG. The electron beam passage holes 25a, 25b, 25c are provided in a line. The seventh grid G7 is formed of a cup-shaped electrode, and the surface of the seventh grid G6 corresponding to the three cathodes is provided on the surface facing the sixth grid G6.
The three substantially circular electron beam passage holes having the same size as the electron beam passage holes on the surface facing 7 are provided in a line.

In this electron gun 21, the cathode K and the first
The third grids G1 to G3 form an electron beam generator GE that controls electron emission from the cathode K and accelerates and focuses the emitted electrons to form an electron beam.
The main electron lens unit M that focuses the electron beam on the phosphor screen by the third to seventh grids G3 to G7.
L is formed. In the main electron lens portion ML, a fifth grid G5 having substantially vertically elongated electron beam passing holes 24a, 24b, 24c and a substantially horizontally elongated electron beam passing hole 25a, 25b, 25c are formed. A multipole lens QL is formed between the sixth grid G6 and the final focusing lens E between the sixth grid G6 and the seventh grid G7.
L is formed.

In such an electron gun 21, the seventh grid G7 has an anode terminal 27 provided on a funnel.
25 to 35 kV from the high voltage power supply 28
Is applied. The sixth grid G6
A voltage of about 20% to 35% of the anode high voltage Eb supplied from the electron gun power supply 31 through a stem pin 30 (see FIG. 3) which hermetically penetrates the stem 29 at the neck end is applied to the reference voltage Vf (DC Voltage), a parabolic voltage Vd that changes in synchronization with the deflection of the electron beam to this reference voltage Vf.
Is applied. The fifth grid G5 connected to the sixth grid G6 via the resistor 22 is further connected to the third grid G3, to which a voltage described later is applied. Furthermore, the fourth grid G
The fourth and fourth grids G4 and G4 are connected in a tube, and the second and fourth grids G2 and G4 are connected to the electron gun power supplies 31 to 50 via stem pins 29 which penetrate the stem 28 in an airtight manner.
A cutoff voltage of 0 to 1000 V is supplied, the first grid G1 is grounded, and the cathode K is connected to an electron gun power supply 31.
Is supplied with a voltage obtained by superimposing a video signal on a DC voltage of 100 to 200 V.

The fifth grid G5 and the third grid G
With respect to the voltage applied to the third grid G3, at least a DC voltage component of the dynamic focus voltage applied to the sixth grid G6 is supplied via the resistor 22, and this is applied to the facing surface of the fifth grid G5 and the sixth grid G6. The capacitance is interposed electrostatically with the sixth grid G6 by the intervening capacitance C56, and a voltage in which the AC component of the dynamic focus voltage induced through the capacitance C56 is superimposed is applied.

The AC component ed of the voltage applied to the fifth grid G5 has a resistance value of the resistor 22 of R, a fifth grid G5 and a fourth
The capacitance between the surfaces facing the grid G4 is C45, the capacitance between the fourth grid and the third grid is C34, the capacitance between the third grid and the second grid is C23, and the sixth grid G6.
Where Vd is the dynamic focus voltage, f is the frequency, φ is the phase difference, and π is the pi, and C56 = C45 = C34 = C23−Cω = ² × fj ² = 1. Is done.

[0030]

(Equation 1) The phase difference φ is expressed by Expression 2.

[0031]

(Equation 2)

FIG. 15 is a graph showing the relationship between the resistance value R and the superimposed voltage (ed) when C = 2 pF and the horizontal deflection frequency fr1 is set to 15.75 kHz and 31.5 kHz using the equation (1). Shown in Solid line is horizontal deflection frequency 3
In the case of 1.5 kHz, the case where the wavy line is 15.75 kHz is shown.

Looking at this graph, the horizontal deflection frequency of 15.75 kHz and 30.5 kHz is 5 to 10 MΩ.
By selecting a resistor having a resistance value equal to or higher than the level, the superimposed voltage (ed) applied to the fifth grid has a minimum value and is stable. For example, according to the electrode connection of the conventional electron gun, it can be seen that the superimposed voltage is stabilized at 1/2 Vd, and the electrode connection of the new electron gun is stabilized at 1/4 Vd.

As described above, by performing the electrode configuration according to the present invention and the electrode connection, the superimposed voltage on the sixth electrode can be reduced to 1 / 2V.
d to 1/4 Vd. This creates a quadrupole lens, a fifth grid,
The potential difference between the sixth grids is Ｖ Vd for the conventional electron gun, but is ３ Vd for the new electron gun.

Since the potential difference becomes 1.5 times as described above, it is not necessary to strengthen the quadrupole lens as in the prior art. Therefore, as shown in FIG. 11, the H-direction diameter of the electron beam passage hole on the sixth grid side of the fifth grid and the V direction diameter of the electron beam passage hole on the fifth grid-facing surface of the sixth grid are reduced. There is no need to shape it. Accordingly, the influence of the penetration voltage of the main lens electric field between the G6 and G7 grids on the surface facing the G6 and G5 grids and the electron beam passage hole, which has conventionally occurred in the electron gun, can be reduced.

Therefore, conventionally, the quadrupole lens in this portion,
The aberration component generated by the auxiliary multipole lens caused by the penetration voltage of the G6-G7 main lens can be reduced, and the deterioration of the electron beam spot over the entire screen can be prevented.

[0037]

According to the present invention, an electron gun having a main electron lens portion formed of a plurality of electrodes for focusing at least one electron beam emitted from an electron beam generation portion on a target, and an electron beam emitted from the electron gun is formed. In a color picture tube device having at least a deflection yoke that generates a magnetic field for deflecting and scanning on a target, the main electron lens portion of the electron gun includes at least an electrode to which an anode high voltage is applied and a screen from a screen side to a cathode side. A focusing lens region is formed, comprising a first to a fifth electrode group and applying a dynamic voltage obtained by superimposing a voltage that changes in synchronization with the deflection of the electron beam on a medium DC voltage lower than the anode high voltage. A first electrode, a second electrode adjacent to the electron beam generator of the first electrode and connected to the first electrode via a resistor disposed in the tube; And the second electrode, the fourth connected
And a third electrode and a fifth electrode supplied with a DC voltage different from the first, second, and fourth electrode groups, and correct the deflection aberration between the first and second electrodes. A capacitance C between an electrode to which a dynamic voltage is applied and an electrode disposed adjacent to the electrode and connected via a resistor, and a resistance value of the resistor. R, frequency f of dynamic voltage synchronized with horizontal deflection
H, frequency fV of dynamic voltage synchronized with vertical deflection
Is set to have a relationship of π ² fHCR ≧ 13/2 when a circle ratio is π.

With the above configuration, an equivalent circuit of the low-pass filter has a configuration as shown in FIG. At this time, each capacitance C2-3, C3-4, C4-5, C
5-6 slightly varies depending on the gap between the electrodes and the area of the electrode facing surface. However, if all the capacitances are the same, (C23 = C34 = C45 = C56) the superimposed voltage (ed) of the G5 electrode ) Is １ ／ Vd. (Assuming that the dynamic voltage supplied to G6 is Vd), the potential difference between the G5 electrode and the G6 electrode is Ｖ Vd in the configuration of FIG.
On the other hand, in the present invention, 3/4 Vd can be generated as a potential difference, and accordingly, it is necessary to reduce the electrode opening diameter for forming a quadrupole lens between G5 and G6 as described above. Disappears.

As a result, it is possible to increase the diameter of the electrode opening in this portion, and it is possible to reduce the aberration component that the electron beam receives by the multipole lens formed by the quadrupole lens portion and the main lens penetration voltage. In addition, it is possible to obtain a dynamic focus electron gun having high focus performance over the entire screen by preventing deterioration due to aberration of the electron beam spot.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an electron gun of a color picture tube device according to an embodiment of the present invention.

FIG. 2A is a view showing the shape of an electron beam passage hole on a surface of a fifth grid of the electron gun facing a sixth grid, and FIG. 2B is a fifth grid of the sixth grid; FIG. 4 is a view showing a shape of an electron beam passage hole on a surface opposite to FIG.

FIG. 3 is a diagram showing a configuration of a color picture tube device according to an embodiment of the present invention.

FIG. 4 is an electrical equivalent circuit diagram of second, third, fourth, fifth, and sixth grid portions of the electron gun shown in FIG.

FIG. 5 is a diagram for explaining voltages applied to fifth and sixth grids of the electron gun shown in FIG. 1;

FIG. 6 is a diagram showing a configuration of a conventional color picture tube device.

7A is a diagram for explaining the action of a pincushion-type horizontal deflection magnetic field on an electron beam, and FIG.
(B) is a diagram showing the shape of the resulting beam spot on the phosphor screen.

FIG. 8A is a view showing a configuration of a conventional improved electron gun, and FIG. 8B is a view showing a shape of an electron beam passage hole on a surface of a third grid opposed to a fourth grid. FIG. 8
(C) is a diagram showing the shape of the electron beam passage hole on the surface of the fourth grid facing the third grid.

FIG. 9 is a diagram for explaining the operation of the main electron lens unit of the improved electron gun.

FIG. 10 is a diagram showing a configuration of an electron gun of a conventional improved color picture tube device.

11A is a diagram showing the shape of an electron beam passage hole on the surface of the electron gun shown in FIG. 10 which faces the fifth grid of the fifth grid, and FIG. 11B is a diagram of FIG. It is a figure which shows the shape of the electron beam passage hole of the surface facing the 5th grid.

FIG. 12 shows the fourth, fifth, and sixth electron guns shown in FIG.
It is an electric equivalent circuit diagram of a grid part.

FIG. 13 is a diagram for explaining voltages applied to fifth and sixth grids of the electron gun shown in FIG.

FIG. 14 is an electric field diagram of a main lens portion of the improved conventional electron gun.

FIG. 15 is a graph showing the relationship between the improved electron gun shown in FIG. 1, the superimposed voltage applied to the fifth grid of the new electron gun, and the resistance, wherein the broken line indicates the deflection frequency of 15.75.
In the case of kHz, the solid line is a graph showing the case where the deflection frequency is 31.5 kHz.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Panel 3 ... Phosphor screen 8 ... Deflection yoke 20B, 20G, 20R ... 3 Electron beam 21 ... Electron gun 22 ... Resistors 24a, 24b, 24c ... Electron beam passage holes 25a, 25b, 25c ... Electron beam passage holes 27 ... Anode terminal 29 ... Stem 30 ... Stem pin EL ... Final focusing lens K ... Cathode G1 ... First grid G2 ... Second grid G3 ... Third grid G4 ... Fourth grid G5 ... Fifth grid G6 ... Sixth grid G7 ... First 7 grid GE: Electron beam generator ML: Main electron lens QL: Multipole lens

Claims (2)

[Claims] 1. An electron gun having a main electron lens portion formed by a plurality of electrodes for focusing at least one electron beam emitted from an electron beam generation portion on a target, and emitted from the electron gun. In a color picture tube device having at least a deflection yoke for generating a magnetic field for deflecting and scanning an electron beam on a target, the main electron lens portion of the electron gun includes at least an electrode to which an anode high voltage is applied and a screen side. A first to a fifth electrode arranged toward the cathode side, wherein a dynamic voltage obtained by superimposing a voltage that changes in synchronization with the deflection of the electron beam on a medium DC voltage lower than the anode high voltage is applied. A first electrode forming a converging lens region, and a resistor disposed in the tube adjacent to the first electrode on the side of the electron beam generating section and the first electrode. The connected second electrode, the fourth electrode connected to the second electrode, and the third and fifth electrodes to which different DC voltages are supplied independently of the first, second and fourth electrodes. And a multi-pole lens forming means for correcting deflection aberration between the first and second electrodes. 2. A capacitance C between a fifth electrode to which a dynamic voltage is applied and a fourth electrode disposed adjacent to the fifth electrode and connected via a resistor. When the resistance value R of the resistor, the frequency fH of the dynamic voltage synchronized with the horizontal deflection, and the frequency fV of the dynamic voltage synchronized with the vertical deflection are π, the relationship of π ² fHCR ≧ 13/2 is satisfied. The color picture tube device according to claim 1, wherein