JPH11204058A - Television picture tube apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out static and dynamic focusing adjustment of a television picture tube apparatus without increasing the stem pins. SOLUTION: This television picture tube comprises an electron gun 27 and a resistor 28 for supplying a prescribed voltage to selected electrodes of the main lens part of the electron gun. At least three electrodes arranged in a first, a second, and a third electrodes G3, G5, G7 in this order in the phosphor screen direction from the cathode are installed in the main lens part. The first, the second, and the third electrodes G3, G5, G7 are electrically connected with a resistor 28 and a prescribed voltage from the outside of the picture tube and dynamic voltage synchronized to the electron beam are applied to the fist electrode G3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a picture tube device such as a color picture tube device, and more particularly to a dynamic dynamic picture system in which a high voltage of an anode is divided by a resistor and a predetermined voltage is supplied to a predetermined electrode of an electron gun. The present invention relates to a focus type picture tube device.

[0002]

2. Description of the Related Art Generally, a color picture tube device has an envelope composed of a panel and a funnel, and a phosphor screen composed of a three-color phosphor layer is provided on an inner surface of the panel so as to face a shadow mask. A color image is displayed by deflecting the three electron beams emitted from the electron gun disposed in the neck of the funnel by the horizontal and vertical deflection magnetic fields generated by the deflecting device, and scanning the phosphor screen horizontally and vertically. It is formed in the structure which does.

[0003] Among such color picture tube devices, there is an in-line type color picture tube device in which the electron gun is an electron gun which emits three electron beams arranged in a line, each including a center beam and a pair of side beams passing through the same horizontal plane. .

The electron gun of this color picture tube apparatus generally has a cathode and a plurality of electrodes arranged in the direction of the phosphor screen from the cathode, and an electron beam forming section is formed by the cathode and a plurality of electrodes sequentially adjacent to the cathode. Are formed, and a plurality of electrodes located closer to the phosphor screen than the electron beam forming unit form a main lens unit that focuses the electron beam from the electron beam forming unit on the phosphor screen. I have.

In such a color picture tube device, in order to improve the image characteristics displayed on the phosphor screen, the three electron beams emitted from the electron gun must be optimally focused and concentrated over the entire screen. is necessary.

Concerning the above-mentioned three electron beam concentration, for example, US Pat. No. 2,957,106 shows a method of focusing a pair of side beams by emitting a pair of side beams by inclining them beforehand with respect to a center beam. I have. Also, in U.S. Pat. No. 3,772,554, among the three electron beam passage holes of the electrode forming the main lens portion, a pair of side beam passage holes are formed by a pair of electrodes adjacent to the electron beam formation portion. A method of concentrating by eccentricity slightly outside of the side beam passage hole of FIG. Both have been widely put to practical use.

However, even if the electron gun is constructed as described above,
In an actual color picture tube device, when an electron beam is deflected, a concentration shift of three electron beams occurs. Therefore, for a color picture tube device that emits three electron beams arranged in a line in the same horizontal plane, the horizontal deflection magnetic field generated by the deflection device is a pincushion type, the vertical deflection magnetic field is a barrel type, and these non-uniform magnetic fields are used. By deflecting,
We focus on the entire screen properly. Such a color picture tube device has a self-convergence
It is called an in-line color picture tube device, and is the mainstream of the current color picture tube device.

However, when three electron beams arranged in a line passing on the same horizontal plane are concentrated by the above-mentioned non-uniform magnetic field, the three electron beams receive remarkably deflection aberration, and the distortion of the beam spot on the phosphor screen becomes large. Deterioration. For example, as shown in FIG. 7A, assuming that the three electron beams 1B, 1G, and 1R (illustrated with respect to 1R) are deflected to the right in the drawing as shown in FIG. As shown, the beam is converged in the vertical direction (Y-axis direction). on the other hand,
In the horizontal direction (X-axis direction), the electron beams 1B, 1G, 1
Since the magnetic flux density is different between the right side and the left side of R, and the right side has a higher magnetic flux density than the left side, as shown by arrow 4,
A large Lorentz force acts on the right side, and as a result, it is pulled right and left.

That is, the pincushion type horizontal deflection magnetic field 2
Operates as a quadrupole lens that diverges the three electron beams 1B, 1G, and 1R in the horizontal direction and converges the three electron beams 1B, 1G, and 1R in the vertical direction, in addition to the prism function that deflects the three electron beams 1B, 1G, and 1R. As a result, as shown in FIG. 7B, the beam spot 5 of the three electron beams deflected to the peripheral portion in the horizontal direction of the screen by the pincushion-type horizontal deflection magnetic field becomes over-focused in the vertical direction, and becomes high. A low-luminance halo portion 7 is formed above and below the luminance core portion 6, resulting in an insufficient focusing state in the horizontal direction, a shape extending left and right, and significantly deteriorating the resolution in the peripheral portion in the horizontal direction of the screen.

Japanese Patent Application Laid-Open No. 64-38947 (US Pat. No. 4,897,575) discloses a color picture tube apparatus which reduces the distortion of the beam spot at the peripheral portion of the screen to improve the resolution. ) And JP-A-5-31764.
In JP-A-4, the distortion of the beam spot at the periphery of the screen is reduced by a so-called dynamic focus method in which the strength of the electron lens is changed according to the amount of deflection of the electron beam.
A color picture tube device for obtaining a high resolution image is shown.
In this color picture tube device, a resistor is arranged along an electron gun, the resistor divides the anode high voltage by resistance, and supplies a predetermined voltage to a specific electrode of the electron gun, thereby forming a high-performance electron lens. It is what forms. Such an electron gun requires at least two stem pins connected to an external circuit to adjust the electron lens, depending on the arrangement of the resistor.

FIG. 8 shows an example of the above-mentioned electron gun (Japanese Unexamined Patent Publication No. Hei 5-31).
7644). The electron gun 9 includes three cathodes 10 arranged in a row in a horizontal direction perpendicular to the paper surface.
B, 10G, 10R (only 10G is shown), three heaters H for individually heating the cathodes 10B, 10G, 10R, and a plurality of heaters H arranged at predetermined intervals in the direction of the phosphor screen from the cathodes 10B, 10G, 10R. There is a shield cup C attached to the first to ninth grids G1 to G9 and the end of the ninth grid G9 on the phosphor screen side.

The first and second grids G1 and G2 are plate-like electrodes having a relatively small thickness, and the third to sixth grids G3 to G3.
G6 is a cylindrical electrode, seventh and eighth grids G7, G8 are
The ninth grid G9, which is a relatively thick plate electrode, is formed of a cylindrical electrode. The first to fourth grids G1 to G4,
On the surface of the fifth grid G5 facing the fourth grid G4 and on the seventh and eighth grids G7 and G8, three circular electron beam passage holes are provided corresponding to the three cathodes 10B, 10G and 10R, respectively. Although they are formed in a single row,
On the surface of the grid G5 facing the sixth grid G6, three vertically long electron beam passage holes corresponding to the three cathodes 10B, 10G, 10R, and three horizontally long electron beams are provided on the sixth grid G6. Beam-Transmitting Holes On the surface of the ninth grid G9 facing the eighth grid G8, three horizontally long electron-beam passing holes are formed in a line.

The resistor 11 is disposed along one side of the electron gun 9, and has a high-voltage supply terminal 14a at one end of the high-resistance resistor 13, an earth connection terminal 14b at the other end, and an intermediate portion. Are provided with three intermediate terminals 14c, 14d and 14e.

In the electron gun 9, the heater H, the cathode 1
0B, 10G, 10R, first to fourth grids G1 to G
A predetermined voltage is supplied to the fourth and sixth grids G6 via stem pins 16 provided on stems for sealing neck ends. That is, 100 to 20 are applied to the cathodes 10B, 10G, 10R via the stem pins 16.
The first grid G1 is connected to ground (0V), the second and fourth grids G2 and G4 are connected in a tube, and a voltage obtained by superimposing a video signal on a voltage of 0V is connected to these electrodes.
The third and sixth grids G3, G6 are also connected in the tube, and these electrodes are connected to the anode high voltage Eb of 20-1000V.
A dynamic focus voltage is applied in which a voltage Vd that changes in synchronization with the electron beam deflection is superimposed on a 30% focus voltage Vf. In contrast, the fifth, seventh,
The eighth and ninth grids G5, G7, G8, G9 are connected to the resistor 11 via an anode terminal provided at a large diameter portion of the funnel and a conductive film applied on the inner surface of the funnel.
About 30 supplied to the high voltage supply terminal 14a at one end of the
The anode high voltage Eb of kV is divided and the fifth grid G5 is connected to the third and sixth grids G3,
A voltage equal to or substantially equal to the focus voltage Vf applied to G6 is applied to the seventh grid G7 at the intermediate terminal portion 14.
d, a voltage of 35 to 45% of the anode high voltage Eb is applied to the eighth grid G8 from the intermediate terminal portion 14e.
Is applied. The anode high voltage Eb of about 30 kV is applied to the ninth grid G9.

In order to obtain a high-resolution image by using such an electron gun 9, the intermediate terminals 14c and 14d of the resistor 11 are required.
, 14e to the fifth, seventh and eighth grids G5, G7,
By adjusting the voltage supplied to G8, these fifth, seventh,
Changing an electron lens (including an asymmetric lens) formed by the eighth grids G5, G7, G8 and adjacent electrodes,
It is necessary to adjust the focus state of the three electron beams on the phosphor screen. In order to adjust the focus state, it is necessary to change the potential of the intermediate terminals 14c, 14d, 14 of the resistor 11, and therefore, the ground connection terminal 14 of the resistor 11 is connected to the variable resistor via the stem pin 16. 17 or a variable voltage power supply.

In this static focus adjustment, the focus in the horizontal direction largely changes mainly due to the electron lens formed by the fifth, seventh, and eighth grids G5, G7, G8 and the adjacent electrodes. Adjusts the focus in the horizontal direction.

On the other hand, a fixed focus voltage V is applied to the third and sixth grids G3 and G6 via the stem pins 16.
Since a dynamic focus voltage on which a voltage Vd that changes in synchronization with the deflection of the electron beam is superimposed is applied to f, the third and sixth grids G3, G6 and G6 are generated with the change of the dynamic focus voltage. Since the electron lens formed by the adjacent electrodes changes, it is necessary to adjust the dynamic focus voltage to adjust the focus state of the three electron beams on the phosphor screen.

In this dynamic focus adjustment (dynamic focus adjustment), mainly in the vertical direction, the focus in the vertical direction largely changes due to the formed electronic lens, thereby adjusting the focus in the vertical direction.

That is, in an electron gun to which a normal dynamic focus voltage is applied, in addition to a stem pin for supplying a predetermined voltage to a heater, a cathode, electrodes constituting an electron beam forming unit, etc., a dynamic focus voltage is applied. The electron gun 9 needs one stem pin to supply the dynamic focus voltage, and further connects the ground connection terminal portion 14b of the resistor 11 to the variable resistor 17 or One stem pin 16 for connecting to a variable voltage power supply is required.

Hereinafter, the static focus adjustment and the dynamic focus adjustment of the electron gun 9 will be described in more detail for comparison with an electron gun according to an embodiment of the invention described later.

These static and dynamic focus adjustments are:
In the electron gun 9, the fifth to ninth grids G5
Since this is performed by changing the electron lens formed by G9 through G9, the following description focuses on the electron lens formed by the fifth through ninth grids G5 through G9.

As shown in FIG. 9, when an anode high voltage of, for example, 30 kV is applied to the ninth grid G9, the resistor 11
The fifth terminal connected to the intermediate terminal portions 14c, 14d, 14e
The resistance division ratio is determined so that a voltage of 8.0 kV is generated on the grid G5, 12.0 kV is generated on the seventh grid G7, and 19.5 kV is generated on the eighth grid G8. The total resistance of the resistor 11 is set to about 3000 MΩ for reliability.
The resistor 11 has a ground connection terminal connected to a stem pin. When the voltage of 8.0 kV is supplied to the sixth grid G6 via the stem pin, the state is referred to as a standard state A.

In the standard state A, since there is no potential difference (0 V) between the fifth and sixth grids G5 and G6, no electron lens is formed in the horizontal and vertical directions, but the sixth and ninth grids G6 and G9. An extended electric field lens is formed between them, and this extended electric field lens is horizontal and
It has a focusing action as shown by underlining in both vertical directions. That is, in the area of the extended electric field lens, an electron lens having a diverging function in the horizontal direction and a focusing function in the vertical direction is formed between the sixth and seventh grids G6 and G7, and the eighth and ninth grids G8 and G8 are formed. Between G9, an electron lens having a horizontal focusing and a vertical diverging action is formed. The overall (overall) focus state has a focusing action in both the horizontal and vertical directions, and three electron beams are focused on the phosphor screen. A focus state where the light is properly focused is obtained.

However, if an error occurs in the interval between the electrodes of the electron gun, the size of the electron beam passage hole, the resistance value of the resistor, the resistance division ratio, or the like, the focus state on the phosphor screen becomes inappropriate. In this case, it is necessary to perform static focus adjustment so that the three electron beams are properly focused. In this static focus adjustment, first, the resistor 1
This is performed by changing the potential of the first ground connection terminal section by the variable resistor 17 or the variable voltage power supply.

If the potential of the ground connection terminal of the resistor 11 is increased by 1 kV, the intermediate terminals 14c and 14d of the resistor 11 are set as shown in FIG. , 14e, the potentials of the fifth, seventh, and eighth grids G5, G7, G8 change accordingly, and between the fifth and sixth grids G5, G6, 0 V to 733 V and 733 V, 6. Between grids G6 and G7, 4000V to 4600V and 600
V, 7500V between the seventh and eighth grids G7 and G8
7250V and 250V, 8th and 9th grids G8,
Between G9, 10500V to 10150V and 350V
Change. As a result, in the horizontal direction, there is a divergence effect on the whole, and the whole (overall) focus state changes in the divergence direction (under-focus direction). On the other hand, in the vertical direction, between the fifth and sixth grids G5 and G6, the sixth and seventh grids G5 and G6.
Between grids G6 and G7, seventh and eighth grids G7 and G8
And the eighth and ninth grids G8 and G9 have a relatively converging action, but the extended electric field lens formed between the sixth and ninth grids G8 and G9 has a relatively diverging action. Canceled and the focus state hardly changes.

On the other hand, when the potential of the earth connection terminal portion of the resistor 11 is lowered, the convergence and divergence are opposite to the case where the potential of the earth connection terminal portion is increased, and the convergence and divergence in the horizontal direction are reduced. The direction (overfocus direction) and the vertical direction hardly change as described above.

Therefore, by changing the potential of the ground connection terminal of the resistor 11, the horizontal focusing state can be adjusted.

Next, the potential of the sixth grid G6 is set to 1 kV.
FIG. 9 shows the case of raising the focus as static focus adjustment V.
In this case, the fifth, seventh, and eighth grids G5, G7, G8
Of the fifth and sixth grids G5,
The voltage between G6 changes to 1000 V and the voltage between the sixth and seventh grids G6 and G7 changes to 3000 V, but the seventh and eighth grids G7 and G7 change.
There is no change between G8 and between the eighth and ninth grids G8 and G9. As a result, in the horizontal direction, the fifth and sixth grids G
5 and G6 and between the sixth and seventh grids G6 and G7,
Although the focusing lens has a focusing action, the extended electric field lens between the sixth and ninth grids G6 and G9 has a relatively diverging action, and the entire (overall) focus state has a slightly focusing action. on the other hand,
The vertical direction has a divergent effect on the whole, so the whole (total)
Changes to a divergent effect. Since this vertical divergence is very strong compared to the horizontal focusing, the horizontal may be considered substantially unchanged.

On the other hand, when the potential of the sixth grid G6 is lowered, the convergence and the divergence are reversed, and the horizontal direction hardly changes, but the vertical direction changes to the focusing action.

Therefore, by changing the potential of the sixth grid G6, the focusing state in the vertical direction can be adjusted.

Next, a case where a dynamic voltage is supplied is shown as a dynamic focus adjustment D in FIG. In this case, a voltage obtained by superimposing a voltage Vd that changes in synchronization with the deflection of the electron beam on a predetermined focus voltage Vf is applied to the sixth grid G6, and the voltage Vd is applied during the horizontal deflection period of the deflection device. Since the high-frequency voltage changes synchronously, the high-frequency voltage is also superimposed on the surrounding electrodes via the capacitance between the electrodes.
The superimposition on the surrounding electrodes can be calculated by an RC equivalent circuit. By superimposing the voltage Vd, the potential of the fifth grid G5 is 8.55 kV, and the potential of the seventh grid G7 is 12.59.
kV, and the potential of the eighth grid G8 is 19.79 kV. Due to this potential change, in the horizontal direction, the convergence action between the fifth and sixth grids G5 and G6, and the sixth and ninth grids G5
The extended electric field lens between G6 and G9 has a relatively diverging effect, the focusing action between the sixth and seventh grids G6 and G7, and the eighth and ninth grids.
There is a divergent effect between grids G8 and G9.
Is slightly focused. On the other hand, in the vertical direction, the diverging action between the fifth and sixth grids G5 and G6, the extended electric field lens between the sixth and ninth grids G6 and G9 are relatively diverging, and the sixth and seventh grids G6 and G6. G7 has a divergence effect, and the eighth and ninth grids G8 and G9 have a convergence effect, so that the entire (overall) focus state is a divergence effect.

[0032]

As described above, in order to improve the image characteristics displayed on the phosphor screen of the picture tube device, the electron beam emitted from the electron gun is optimally focused over the entire screen. Therefore, it is necessary to supply a dynamic focus voltage to the electrodes constituting the electron gun, and to resist the anode high voltage by a resistor to a specific electrode selected from a plurality of electrodes constituting the main lens portion. There are electron guns that are configured to divide and form an extended field lens that supplies a predetermined voltage.

Such an electron gun comprises a heater, a cathode,
A stem pin for supplying a dynamic focus voltage is necessary in addition to a stem pin for supplying a predetermined voltage to the electrodes and the like that constitute the electron beam forming unit. Requires a stem pin to connect to a variable resistor or a variable voltage power supply. Such an arrangement of the stem pins is not a problem when the neck diameter on which the electron gun and the resistor are arranged is as large as 29.1 mm, but when the neck diameter is as small as 22.5 mm, the interval between the stem pins becomes narrow. The withstand voltage between the stem pins and the socket mounted on the stem pins poses a problem.

The present invention has been made in view of the above problems, and supplies a dynamic focus voltage to an electrode constituting a main lens portion of an electron gun, and selects from a plurality of electrodes constituting a main lens portion. In a picture tube device having an electron gun configured to divide an anode high voltage by a resistor to a specific electrode and to supply a predetermined voltage, a static focus adjustment and a dynamic focus adjustment are performed by increasing the number of stem pins. The purpose is to be able to do without.

[0035]

An electron beam forming portion is formed by a cathode and a plurality of electrodes arranged in the direction of the phosphor screen from the cathode, and the cathode and a plurality of electrodes sequentially adjacent to the cathode. A plurality of electrodes positioned closer to the phosphor screen than the electron beam forming unit form an electron gun in which a main lens unit for focusing the electron beam from the electron beam forming unit on the phosphor screen is formed, and the anode high voltage is divided. And a deflecting device for deflecting an electron beam emitted from an electron gun, and a resistor for supplying a predetermined voltage to an electrode selected from a plurality of electrodes forming a main lens portion. The first, second, third in the direction from the cathode to the phosphor screen
At least three electrodes are arranged in this order, the first, second, and third electrodes are electrically connected to a resistor, and a predetermined voltage and an electron beam are applied to the second electrode from outside the tube. And a structure for applying a dynamic voltage in synchronization with the deflection of.

[0036]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 shows a color picture tube device which is one embodiment of the present invention. This color picture tube device has an envelope composed of a panel 20 and a funnel-shaped funnel 21 joined to the panel 20, and blue, green,
A phosphor screen 22 composed of a three-color phosphor layer elongated in the vertical direction (Y-axis direction) that emits red light is provided, and a shadow mask 23 is disposed inside the phosphor screen 22 so as to face the phosphor screen 22. ing. On the other hand, an electron gun 27 that emits three electron beams 26B, 26G, 26R (only 26G is shown) arranged in a line in the same horizontal plane is disposed in the neck 25 of the funnel 21. A resistor 28 is arranged along the electron gun 27.
A deflecting device 30 is mounted outside the vicinity of the boundary between the neck 25 and the large-diameter portion 29 of the funnel 21. Further, an anode terminal 31 is provided on the large-diameter portion 29 of the funnel 21, and a conductive film 32 is formed by coating from the inner surface of the large-diameter portion 29 of the funnel 21 to the inner surface of the adjacent portion of the neck 25. Then, 3 emitted from the electron gun 27
The electron beams 26B, 26G, 26R are deflected by the horizontal and vertical deflection magnetic fields generated by the deflecting device 30, and the phosphor screen 22 is horizontally and vertically scanned to display a color image.

As shown in FIG. 1, the electron gun 27 has three cathodes 34B, 34G arranged in a row in the horizontal direction.
, 34R (only 34G is shown), these cathodes 34B
, 34G and 34R are separately heated by three heaters H,
There are first to ninth grids G1 to G9 which are sequentially arranged at predetermined intervals from the cathodes 34B, 34G, 34R in the direction of the phosphor screen, and a shield cup C attached to the phosphor screen side end of the ninth grid G9. Assembled into a structure.

The first and second grids G1 and G2 are plate electrodes of an integral structure having a comparatively small thickness, and the third to sixth grids G3 to G6 are cylindrical electrodes of an integral structure, and the seventh and seventh grids G3 to G6 are of a monolithic structure. The eighth grids G7 and G8 are plate electrodes of an integral structure having a relatively large thickness, and the ninth grid G9 is a cylindrical electrode of an integral structure. On the surfaces of the first to fourth grids G1 to G4 and the fifth grid G5 facing the fourth grid G4, 3
Three circular electron beam passage holes are formed in one row corresponding to the three cathodes 34B, 34G, 34R.
On the other hand, on the surface of the fifth grid G5 facing the sixth grid G6, as shown in FIG. 2 (a), three vertically elongated electron beam passage holes 36B, corresponding to the three cathodes, are provided. 3
6G and 36R, on the sixth grid G6, three horizontally long electron beam passage holes 37B, 37G and 37R are formed in one row corresponding to the three cathodes as shown in FIG. ing. In the seventh and eighth grids G7 and G8, three circular electron beam passage holes 38B, 38G and 38R are formed in a row so as to correspond to the three cathodes as shown in FIG. I have. On the surface of the ninth grid G9 facing the eighth grid G8, three horizontally long electron beam passage holes 3 corresponding to the three cathodes are provided as shown in FIG.
9B, 39G and 39R are formed in a line.

The resistor 28 is disposed along one side of the electron gun 27, and has a high-voltage supply terminal 42a at one end of a high-resistance resistor 41 and a connection terminal with the third grid at the other end. 42b, three intermediate terminal portions 42c, 42d, 4 in the intermediate portion.
2e is provided.

In the electron gun 27, the heater H, the cathodes 34B, 34G, 34R, the first to fourth grids G1 to G1 to G4 are used.
A predetermined voltage is supplied to G4 and the sixth grid G6 via a stem pin 44 (see FIG. 3) provided on a stem 43 for sealing the neck end. That is, through the stem pins 44, the cathodes 34B, 34G, 34R
The first grid G1 is connected to ground (0V), the second and fourth grids G2 and G4 are connected in a tube,
These electrodes are also connected with 500-1000 V, third and sixth grids G3 and G6 in the tube, and these electrodes are supplied with a focus voltage Vf of 20-30% of the anode high voltage Eb in synchronization with the deflection of the electron beam. A dynamic focus voltage on which the changing voltage Vd is superimposed is applied. On the other hand, the fifth, seventh, and eighth grids G5, G7, and G8 are connected to the high-voltage supply terminal at one end of the resistor 28 via a conductive film formed on the inner surface of the funnel from the anode terminal. 4
The anode high voltage Eb of about 30 kV supplied to the second grid 2a is divided, and the fifth grid G5 is connected to the intermediate terminal 42c at the same level as the focus voltage Vf applied to the third and sixth grids G3 and G6. Or the same voltage is applied to the seventh grid G
A predetermined voltage obtained by dividing the anode high voltage Eb by resistance is applied to the electrode 7 from the intermediate terminal 42d and to the eighth grid G8 from the intermediate terminal 42e. The ninth
The anode high voltage Eb of about 30 kV is applied to the grid G9 from the anode terminal via a conductive film formed on the inner surface of the funnel.

With the above configuration, in the electron gun 27, the cathodes 34B, 34G, 34R and the cathode 34B
, 34G, 34R, the first and second grids G1, G2 control electron emission from the cathodes 34B, 34G, 34R, and focus the emitted electrons into three electron beams. Part is formed, the third
The third to ninth grids G3 to G9 accelerate the three electron beams from the electron beam forming unit on the phosphor screen,
A converging main lens portion is formed. The main lens portion has fifth, sixth, and ninth grids G5, G6, and G9 having non-circular electron beam passage holes and electrodes adjacent to the grids.
An asymmetric lens is formed by the grid G5 and the sixth grid G6, the sixth grid G6 and the seventh grid G7, and the eighth grid G8 and the ninth grid G9, and a long distance is formed between the sixth and ninth grids G6 and G9. An extended field lens of focus is formed.

That is, this electron gun 27 has almost the same structure and structure of electrodes as the conventional electron gun shown in FIG. 8, and the structure of the formed electron lens. Is different.

By the way, with the above configuration, the focus voltage Vf connected to the resistor 28 via the connection terminal 42b and supplied to the third grid G3 (first electrode) via the stem pin 16 changes. By letting
Not only can the potential of the third grid G3 and the potential of the sixth grid G6 connected to the third grid G3 be adjusted, but also the intermediate terminals 42c, 42d, 4 of the resistor 28.
The potential of the fifth grid G5 (second electrode), the seventh grid G7 (third electrode), the eighth grid G8, and the like connected to 2e can also be adjusted. Thereby, at the time of static focus adjustment, the horizontal and vertical focus states of the three electron beams 26B, 26G, 26R can be simultaneously adjusted. Also, when the dynamic focus voltage Vd is supplied to the third grid G3 and the sixth grid G6, the fact that the potential of the resistor 28 does not fluctuate through the resistor 28 because the resistance of the resistor 28 is large is used. Dynamic focus adjustment can be performed, and the stem pins 44 connected to the third grid G3 can be connected without connecting a resistor to the stem pins via a ground connection terminal as in the conventional electron gun shown in FIG. By using this, desired focus adjustment can be performed without increasing the number of stem pins.

Hereinafter, the focus adjustment of the electron gun 27 will be described in detail. As shown in FIG. 4, the ninth grid G9
When an anode high voltage of 30 kV is applied to the resistor 28, 8.1 kV is applied to the fifth grid G5 connected to the intermediate terminals 42c, 42d and 42e of the resistor 28 and 12.0 to the seventh grid G7.
The resistance division ratio is determined so that a voltage of 19.5 kV is generated in the eighth grid G8 at kV. The total resistance of the resistor 11 is set to about 3000 MΩ for reliability. 7. Then, the sixth grid G6 is connected to the sixth grid G6 via a stem pin.
A state where a voltage of 0 kV is supplied is referred to as a standard state A.

In the standard condition A, since a potential difference of 1000 V is generated between the fifth and sixth grids G5 and G6, an electron lens having a weak diverging action in the horizontal direction and a weak focusing action in the vertical direction is formed. An extended electric field lens formed between the ninth grids G6 and G9 serves as a main lens of this electron gun and has a focusing action in both the horizontal and vertical directions. That is, in the area of the extended electric field lens, the sixth, seventh,
Between the grids G6 and G7, an electron lens that diverges in the horizontal direction and converges in the vertical direction is formed. Electrons that converge in the horizontal direction and diverge in the vertical direction are formed between the eighth and ninth grids G8 and G9. A lens is formed, and as a whole (total), the three electron beams have a focusing action in both the horizontal and vertical directions, and the three electron beams are appropriately focused on the phosphor screen.

However, if an error occurs in the manufacturing process between the electrode spacing of the electron gun, the size of the electron beam passage hole, the resistance value of the resistor, and the resistance division ratio, the focus state on the phosphor screen becomes inappropriate, and It becomes necessary to adjust the static focus so as to properly focus the electron beam. In this electron gun, the static focus adjustment is performed on the sixth grid G through a stem pin connected to the third grid.
This is done by statically changing the potential of 6.

For this purpose, if the potential of the sixth grid G6 is increased by 1 kV, as shown in FIG. 4 as the static focus adjustment S, the potential of the sixth grid G6 is changed via the third grid connected to the sixth grid G6. The fifth, seventh, and seventh terminals connected to the intermediate terminals 42c, 42d, and 42e of the resistor 28, respectively.
The potentials of the eighth grids G5, G7, G8 change according to the resistance division ratio of the resistor 28, and the fifth and sixth grids G5, G5, G5
Between G6, 100V to 95V and 5V, and between the sixth and seventh grids G6, G7, 4000V to 3818V and 18V.
2V, 7500V between the seventh and eighth grids G7, G8
7259V and 241V from the eighth and ninth grids G8,
During G9, the voltage changes from 10500 V to 10023 V and 477 V. In this case, in the horizontal direction, the potential difference between the fifth and sixth grids G5 and G6 is extremely small, so that they have almost no lens action, and the sixth and ninth grids G6 and G9.
The extended electric field lens between them has a relatively diverging action, a focusing action between the sixth and seventh grids G6 and G7, and a diverging action between the eighth and ninth grids G8 and G9. The focus state changes in the diverging direction (under-focus direction). On the other hand, in the vertical direction, the fifth and sixth
Since the potential difference between the grids G5 and G6 is very small, it has almost no lens action as in the horizontal direction, and the extended electric field lens between the sixth and ninth grids G6 and G9 has a relatively divergent action. Sixth and seventh grids G6, G7
Between the divergent action, the eighth and ninth grids G8 and G9,
With a focusing action, the overall (overall) focus state changes in the diverging direction (underfocus direction).

On the other hand, assuming that the potential of the sixth grid G6 is lowered, the potential of the connection terminal portion of the resistor 28 with the third grid is lowered, and the case where the potential of the sixth grid G6 is raised is as follows. Focusing and divergence are reversed, and both the horizontal and vertical directions change in the focusing direction (overfocus direction).

Therefore, the horizontal focusing state can be easily adjusted by changing the potential of the sixth grid G6.

Next, a case where a dynamic voltage is supplied is shown as a dynamic focus adjustment D in FIG. In this case, a dynamic focus voltage in which a predetermined focus voltage Vf and a voltage Vd that changes in synchronization with the deflection of the electron beam are superimposed on the sixth grid G6 is applied. Since the high-frequency voltage is synchronized with the deflection cycle, the voltage is also superimposed on the surrounding electrodes via the capacitance between the electrodes. The superimposition on the surrounding electrodes can be calculated by the RC equivalent circuit shown in FIG.

The capacitances C1 to C5 between the respective electrodes are about 1 to 2 pF when calculated from the area and the interval between the opposing electrodes. However, since some of the electrodes face each other, and the connectors connected to the electrodes also have capacitance, the actual capacitances C1 to C5 are larger than the above calculated values and are several pF. The horizontal deflection frequency is 15.75 kHz in a normal NTSC system, but is 64 kHz, 9 in a color picture tube device used for a monitor of a personal computer or the like.
0 kHz, and taking this into account, the AC impedance Z due to the capacitance becomes 1 MΩ or less. This value is
Since the resistance value is very small compared to the total resistance value R0 of the resistor 28, most of the resistance value R0 is superimposed via the capacitance. In particular, the superimposition on the fifth grid G5 is a parallel connection of about 14 MΩ and 1 MΩ at the portion of R4 having the smallest resistance value, and the combined resistance becomes 0.95 MΩ to 8.65 kV. Further, the potential of the seventh grid G7 is 12.59 k
V, the potential of the eighth grid G8 is 19.79 kV.
Due to this potential change, in the horizontal direction, the convergence action between the fifth and sixth grids G5 and G6, the sixth and ninth grids G6 and G6,
The extended electric field lens between G9 has a relatively divergent action, the sixth and seventh grids G6 and G7 have a convergence action, and the eighth and ninth grids G8 and G9 have a divergent action, and the overall (total) focus state Is somewhat focused. On the other hand, in the vertical direction,
A divergent action between the fifth and sixth grids G5 and G6, a relatively divergent action with the extended electric field lens between the sixth and ninth grids G6 and G9, a divergent action between the sixth and seventh grids G6 and G7,
The eighth and ninth grids G8 and G9 have a convergence action, and the entire (overall) focus state is a divergence action. Thereby, the deflection distortion in the peripheral portion of the screen is corrected, and a color picture tube device with good resolution can be obtained.

In the above embodiment, in the description of the focus adjustment, as shown in FIG.
The potential of the eighth grid in the standard state is 8.1 k, respectively.
V, 12.0 kV, and 19.5 kV, the resistance division ratio of the resistor is set. However, the standard state is not limited to this. For example, the potential of the fifth grid is 9
It is also possible to set the voltage to be kV, set this to the standard state, and adjust the action of each electron lens so that an appropriate focus state is obtained on the screen. The operation of the electron lens can be easily adjusted by changing the shape and size of the electron beam passage hole of the electrode. In particular, when the potential of the fifth grid is set to 9 kV in this way, the resistance value at the portion of R4 of the resistor increases, so that the superimposition of the voltage Vd which changes in synchronization with the deflection of the electron beam to the fifth grid. However, the capacitance can be increased.

Further, it is possible to change the potentials of the seventh and eighth grids.

In the above embodiment, the electron gun in which the seventh and eighth grids and two electrodes are arranged between the sixth and ninth grids constituting the main lens portion has been described. However, the present invention is not limited to such an electron gun. For example, as shown in FIG. 6, a seventh grid G6 is provided between a sixth grid G6 and a ninth grid G9.
The present invention is also applicable to electron guns having other structures, such as the electron gun 27 in which one electrode made of 7 is disposed.

[0056]

According to the present invention, there is provided a picture tube device including a resistor for supplying a predetermined voltage to an electrode selected from a plurality of electrodes constituting a main lens portion of an electron gun by dividing an anode high voltage by resistance.
At least three electrodes arranged in the order of the cathode, the phosphor screen and the first, second, and third electrodes are provided on the main lens portion, and these first, second, and third electrodes are used as resistors. If it is formed in such a structure that it is electrically connected and a predetermined voltage and a dynamic voltage synchronized with the deflection of the electron beam are applied to the second electrode from outside the tube, the horizontal and vertical directions of the three electron beams can be adjusted during static focus adjustment. The focus state can be adjusted at the same time, and dynamic focus adjustment can also be performed, eliminating the need for a stem pin to connect the resistor to the ground connection terminal like a conventional electron gun, and thus increasing the number of stem pins. Therefore, a desired focus adjustment can be performed, and a picture tube device with good resolution can be configured.

[Brief description of the drawings]

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

FIG. 2A is a view showing a sixth grid of a fifth grid of the electron gun.
FIG. 2B is a diagram showing the shape of the electron beam passage hole on the surface facing the grid, FIG. 2B is a diagram showing the shape of the electron beam passage hole on the sixth grid, and FIG. FIG. 2D is a diagram illustrating a shape of a beam passing hole, and FIG. 2D is a diagram illustrating a shape of an electron beam passing hole on a surface of the ninth grid facing the eighth grid.

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 a diagram for explaining focus adjustment of the electron gun.

FIG. 5 is an RC circuit diagram for explaining a voltage superimposed via a capacitance between electrodes of the electron gun.

FIG. 6 is a diagram showing a configuration of an electron gun and a resistor of a color picture tube device according to another embodiment of the present invention.

FIG. 7A is a diagram for explaining the deflection aberration of a pincushion-type horizontal deflection magnetic field, and FIG. 7B is a diagram showing a shape of an electron beam beam spot distorted by the deflection aberration.

FIG. 8 is a diagram showing a configuration of an electron gun and a resistor of a conventional color picture tube device.

FIG. 9 is a diagram for explaining focus adjustment of the conventional electron gun.

[Explanation of symbols]

 Reference numeral 22 phosphor screen 25 neck 27 electron gun 28 resistor 30 deflecting device 34G cathode 41 resistor 42a high voltage supply terminal 42b connection terminal to the third grid 42c, 42d. 42e ... middle terminal part 43 ... stem 44 ... stem pin G1 ... first grid G2 ... second grid G3 ... third grid G4 ... fourth grid G5 ... fifth grid G6 ... sixth grid G7 ... seventh grid G8 ... eighth Grid G9… 9th grid

Claims (1)

[Claims] 1. An electron beam forming part comprising a cathode and a plurality of electrodes arranged in the direction of a phosphor screen from the cathode, wherein the cathode and a plurality of electrodes sequentially adjacent to the cathode form an electron beam forming part. A plurality of electrodes positioned closer to the phosphor screen than a portion, an electron gun in which a main lens portion for focusing the electron beam from the electron beam forming portion on the phosphor screen is formed, and the anode high voltage is divided. A picture tube device comprising: a resistor for supplying a predetermined voltage to an electrode selected from a plurality of electrodes forming the main lens portion; and a deflecting device for deflecting an electron beam emitted from the electron gun. The lens unit has at least first, second, and third electrodes sequentially arranged in the direction from the cathode to the phosphor screen. A third electrode is electrically connected to the resistor, and a predetermined voltage and a dynamic voltage synchronized with the deflection of the electron beam are applied to the second electrode from outside the tube. A picture tube device characterized by the above-mentioned.