JP3419991B2 - In-line type electron gun - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color picture tube.
In-line type electron gun used, especially two of opposite polarity
In-line type electron gun equipped with variable intensity quadrupole lens
It is about. [0002] A color image receiving apparatus equipped with an in-line type electron gun
For pipes, the so-called self-convergence method is usually used.
A direction yoke is used. Self-convergence deflection magnet
The field overlaps the six-pole magnetic field component in addition to the uniform deflection magnetic field component.
Folded, pin-cushion type magnetic force in horizontal deflection magnetic field
Barrel-shaped magnetic field lines for line distribution and vertical deflection magnetic field
It is a distribution. Due to the action of the six-pole magnetic field component
Three electronic beams that are ejected in-line from the electron gun
The system is correctly focused on the front of the screen. However, one
Looking at one electron beam, the self-convergence
The deflection magnetic field is a divergent lens in the horizontal direction,
In the vertical direction, it acts as a focusing lens. Take
Just focus in the center of the screen for astigmatic lens action
The electron beam in the scanning state to the periphery of the screen
In the horizontal direction, the divergent lens action
To compensate for the elongation of the optical path length of the electron beam.
Although the focus state is maintained, the vertical
The effect of the focusing lens and the effect of extending the optical path length are synergistic,
The bar focus state is set. The above phenomenon occurs in the vertical direction of the bright spot around the screen.
Wide halo, resulting in significant vertical resolution
Many attempts have been made to improve
I have. Among them, the ones currently in practical use are
The strength of the main lens of the sub gun is variable and the horizontal
Variable strength with convergence function and divergence action in the vertical direction
A new 4-pole lens is provided inside the electron gun and is generated by the deflection magnetic field.
Dynamically correct vertical overfocus
It is a method to do. Electron beam imaging state by this method
Is schematically shown in FIG. The figure shows a single
The horizontal axis is the distance along the chief ray trajectory of the child beam, and the upper half
The vertical imaging state and the horizontal imaging state are displayed in the lower half.
In addition, the broken line indicates the image forming state when there is no deflection (the center of the screen), and the solid line
Represents the imaging state at the time of deflection (the peripheral portion of the screen). Picture
At the center of the plane, the electron beam 1 is projected onto the screen plane 2a.
In both horizontal and vertical directions.
The strength of the main lens 3 is set such that Around the screen
As the deflection angle increases, the astigmatism of the deflection magnetic field increases.
The variable intensity quadrupole lens is synchronized with this
5 and the main lens 3
The focus state on the ground surface 2b is horizontal and vertical.
It is maintained in both directions. [0004] As described above, the vertical overflow around the screen is
-The focus is dynamically corrected,
The horizontal resolution at the periphery of the picture tube of the color picture tube has significantly improved.
I got it. However, recently, color picture tubes are required
The resolution capability has been increasing, and the
Degradation of the horizontal resolution at the edges has emerged as the next problem.
You. The cause of the deterioration of the horizontal resolution at the periphery of the screen is as follows.
It is described as follows. Constants derived from electron optics theory
According to the theory, the ratio of the space potential on the object side to the space potential on the image side is one.
If fixed, the magnification (more precisely, the lateral magnification) is the angle magnification
It is known to be inversely proportional. This theorem is
If applied to the figure, the electron beam is moved from the center of the screen to the periphery of the screen.
Deflection in the horizontal direction,
As the convergence angle of the child beam becomes smaller, the magnification becomes larger,
In the vertical direction, the convergence angle is large, so the magnification is small.
Become. Therefore, a fine circular electron beam spot at the center of the screen
Even if a cut is formed, the screen edge
It becomes a long and flat electron beam spot shape.
As a result, the horizontal resolution decreases. [0006] Deterioration of horizontal resolution occurs at the periphery of the screen
The theory of elephants is as described above, but the optics behind
The reason for the system configuration is that the variable intensity quadrupole
Lens 5 and the astigmatic lens 4 of the deflecting magnetic field are essentially double
In other words, it is to constitute a quadrupole optical system. Image point is horizontal
The magnification is vertical and horizontal, even if
Pseudo-stigmatic imaging, which differs greatly from the direct direction,
In general, a typical imaging state of a doublet quadrupole optical type
Known. At the same time, such horizontal and vertical directions
To reduce the difference in magnification between
It is also well known that a polar optics configuration is useful. more than
Based on this, measures to improve the horizontal resolution around the screen
And the variable intensity quadrupole lens 5
Another variable-intensity quadrupole laser that acts on the opposite polarity to the lens
Lens, these two variable intensity quadrupole lenses and deflection
Triplet quadrupole optics with magnetic field astigmatism lens 4
It is envisaged to construct the system. Two-stage variable intensity quadrupole lens with opposite polarities
Quadrupole with the astigmatic lens and the deflection magnetic field
Schematic representation of the electron beam imaging state when a sub-optical system is configured
FIG. 8 shows a ray diagram expressed in a typical manner. In the figure, 6 is the figure
The variable intensity quadrupole lens added to the optical system shown in FIG.
In contrast to the polarity of the variable intensity quadrupole lens 5 at the next stage,
A divergent lens in the direction and a focusing lens in the vertical direction
Be configured as follows. In the following, two variable intensity quadrupole lenses
To distinguish, 6 is the first variable intensity quadrupole lens and 5
Is referred to as a second variable intensity quadrupole lens. Next, the operation will be described. In the center of the screen
In other words, the electron beam 1 is horizontal on the screen surface 2a.
So that it is in the just focus state
The intensity of the main lens 3 is set. In the periphery of the screen
As the deflection angle increases, the astigmatism lens 4 of the deflection magnetic field
The first variable intensity quadrupole lens 6
And the second variable intensity quadrupole lens 5 and the main lens 3
To reduce the justification on the screen surface 2b.
The focus state is maintained both horizontally and vertically. Honmitsu
The feature of the system configuration is that the electron beam is deflected to the periphery of the screen
And the electron beam 1 by the first variable intensity quadrupole lens 6
Since it can be spread horizontally once,
The horizontal focusing angle of the electron beam is a single-stage variable as shown in FIG.
With an in-line type electron gun equipped with a 4-pole lens
And therefore the horizontal direction around the screen
The increase in magnification is reduced. [0009] One such triplet quadrupole optical system
The principle of improving horizontal resolution based on general properties
There are various forms of concrete means realized in the gun structure
I do. FIG. 9 shows a structure of an electron gun as one specific example.
FIG. 1 is a plan sectional view, which is disclosed in JP-A-3-93135.
It is what has been. In the figure, 7a, 7b, 7c
Indicates three cathodes arranged in line, and 8 indicates a grid.
Electrode 9 is an extraction electrode, and three electrodes
The three-pole part which generates the electron beam of this is comprised. Also one
0 is the first auxiliary electrode, 11 is the second auxiliary electrode, and 12 is the first auxiliary electrode.
A bundle electrode, 13 is a second focusing electrode, and 14 is an anode electrode.
The final accelerating electrode to which pressure is applied. First auxiliary electrode 10
The first focusing electrode 12 has a static voltage of a constant voltage.
The second auxiliary electrode 11 and the second auxiliary electrode 11
2 Focusing electrode 13 has a constant voltage and is synchronized with an increase in deflection angle
Focus voltage on which the rising voltage is superimposed
Pressure Vfd is applied. Next, the shape of the electron beam passage hole of each electrode is
This will be described sequentially. The first auxiliary electrode 10
Circular openings 15a, 15b, 15c are formed on the surface facing the pole 9.
Provided on the surface facing the second auxiliary electrode 11 in the horizontal direction.
Horizontally elongated rectangular recesses 16a, 16b, 16c are provided as long axes.
Have been killed. The second auxiliary electrode 11 has a vertical direction.
Vertically elongated rectangular openings 17a, 17b, 17c serving as long axes are provided.
Have been killed. The first focusing electrode 12 has a second auxiliary power.
Horizontal rectangle with the long axis in the horizontal direction on the surface facing the pole 11
Openings 18a, 18b, 18c are provided, and the second focusing electrode
13 is a vertically long rectangular opening whose major axis is perpendicular to the surface facing
The mouths 19a, 19b, 19c are provided. Also,
Water is applied to the surface of the two focusing electrodes 13 facing the first focusing electrode 12.
Horizontally long rectangular openings 20a, 20b, 2
0c, the second focusing electrode 13 and the final accelerating electrode 14
The main lens electric field is formed on the surface opposite to
21a, 21b, 21c and 22a, 22 for
b, 22c are provided. According to the electron gun configured as described above, the electron gun
When the beam is deflected to the periphery of the screen,
Due to the rise of the cas voltage Vfd, the second focusing electrode 13 and the final
The main lens 3 formed at the portion facing the acceleration electrode 14 is weak
And a pair of the first auxiliary electrode 10 and the second auxiliary electrode 11
Opposing portion and the second auxiliary electrode 11 and the first focusing electrode 12
Both parts have a divergent effect in the horizontal direction and gather in the vertical direction.
Variable intensity lens having a bundling effect, ie, first variable intensity quadrupole
A lens 6 is formed, and a first focusing electrode 12 and a second focusing electrode 12 are formed.
The portion facing the electrode 13 has a horizontal focusing action,
A variable intensity lens having a diverging effect in the vertical direction,
A variable intensity quadrupole lens 5 is formed. From the above, FIG.
The optical system shown is realized, and the horizontal
The rate increase is suppressed. The general properties of a triplet quadrupole optical system
The principle of horizontal resolution improvement based on two stages of opposite polarities
It was embodied by having a variable intensity quadrupole lens.
Another example of the configuration of the electron gun is disclosed in, for example, Japanese Patent Application Laid-Open No. 7-262935.
It is also disclosed in gazettes and the like. [0013] The above-described problems with each other
A conventional in-plane with a two-stage variable intensity quadrupole lens of opposite polarity
Line-type electron guns have improved horizontal resolution around the screen
However, the introduction of the first variable-intensity quadrupole lens
This causes the following problems. First, the first problem is the vertical solution at the periphery of the screen.
The image quality is degraded. Two-stage variable-intensity quadrupole lenses of opposite polarities
Variable intensity quadrupole in in-line type electron gun equipped with
As mentioned above, the purpose of introducing the lens is to
Spread the electron beam in the horizontal direction, and double the horizontal
The goal was to reduce the rate. But about the vertical direction
Conversely acts to increase the magnification.
You. For this reason, an input comprising a single-stage variable-intensity quadrupole lens
Compared to the case with a line type electron gun,
Vertical resolution is generally poor. Especially in the horizontal direction around the screen
If you try to make the rate about the same as the center of the screen, the first variable
Since the strength of the 4-pole lens must be increased,
The vertical resolution at the center of the screen
In some cases, it was worse than the image resolution. Next, the second problem is that the entire screen is decompressed.
Necessary to maintain an imaging state where focus does not occur.
The voltage amplitude of the dynamic focus voltage increases
It is. Two-stage variable-intensity quadrupole lenses of opposite polarities
A single-stage variable-intensity 4-pole laser
Voltage amplitude greater than inline electron gun with
Explains Why Dynamic Focus Voltage Is Required
I do. In FIG. 8, the second variable intensity quadrupole lens 5 is horizontal.
To match the vertical imaging position with the vertical imaging position.
The main lens 3 performs the point correction action, and
It has a field curvature correction action that matches the image plane.
The intensity of the second variable intensity quadrupole lens 5 depends on the electrode shape.
Because it can be set freely,
The voltage amplitude required for the cas voltage is determined by the electron beam
The main lens 3 must be weakened when
It is determined from the condition of whether or not. But dynamic
When the focus voltage increases, the first variable intensity quadrupole lens
6 acts to temporarily move the electron beam to the subsequent lens.
The distance between the imaginary point position and the main lens 3 is the first variable intensity quadrupole.
It is longer than in the case of FIG. 7 where the lens 6 is not provided. Obedience
The electron beam correctly on the screen surface
In order to do so, the main lens strength must be reduced,
As a result, the voltage amplitude of the required dynamic voltage increases.
It is. Based on the introduction of the first variable intensity quadrupole lens,
Increasing the voltage amplitude of the dynamic focus voltage is practically
It is a very serious problem. High especially for recent image receiving devices
Since operation at the deflection frequency is required, the power
There is a heavy burden in terms of technology and cost in manufacturing the circuit.
I was The present invention has been made to solve such a problem.
It is a two-stage variable intensity with opposite polarities
Image characteristic of in-line type electron gun with quadrupole lens
Maintain a high horizontal resolution around the screen and
Of vertical resolution and dynamic focus
To provide an in-line type electron gun that reduces the increase in voltage amplitude
The purpose is to provide. [0020] According to the present invention, there is provided an in-line device.
Type electron gun consists of three cathodes arranged in line,
Electron beam composed of lid electrode and extraction electrode
From the generator, the electron beam is focused on the screen surface.
At least a first quadrupole between the main lenses
And a second quadrupole lens are arranged in this order,
The lens and the second quadrupole lens deflect the electron beam.
Dynamic focus that rises in synchronization with the increase in angle
Electrode to which voltage is applied and constant static focus
Is formed at the part facing the electrode to which the source voltage is applied.
The lens includes an electrode to which an anode voltage is applied and the above-described die.
At the part opposite to the electrode to which the
Formed and rises in synchronization with the increase in the deflection angle of the electron beam
The first dynamic focus voltage causes the first
Quadrupole lens enhances the divergence in the horizontal direction and
And the second quadrupole lens moves in the horizontal direction.
Focusing action is enhanced, and divergent action is enhanced in the vertical direction.
The main lens is designed to weaken the focusing action.
From the electron beam generator to the first quadrupole lens
In between, has a horizontal focusing effect and diverges vertically
Has an action or has a horizontal focusing action,
And has a weaker focusing effect in the vertical direction than in the horizontal direction.
An axisymmetric lens is formed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Embodiment 1. An inline according to Embodiment 1 of the present invention
An electron gun will be described. FIG. 1 shows an embodiment of the present invention.
Horizontal section showing the configuration of the in-line type electron gun according to the first embodiment.
FIG. In the figure, 7a, 7b, 7c are inline
, Three cathodes, 8 is a grid electrode, 9 is
These are the extraction electrodes, which are used for three electron beams.
Is formed. 10 is the first auxiliary power
Pole, 11 is a second auxiliary electrode, 12 is a first focusing electrode, 13 is
The second focusing electrode 14, 14 is the last electrode to which the anode voltage is applied.
It is a fast electrode. First auxiliary electrode 10 and first focusing electrode 12
Is marked with a constant static focus voltage Vfs
In addition, the second auxiliary electrode 11 and the second focusing electrode 13
A voltage that rises in synchronization with the increase in deflection angle is superimposed on the voltage
The applied dynamic focus voltage Vfd is applied. Ma
The extracted focus electrode 9 has a static focus voltage Vf
A constant voltage Vg lower than s is applied. Next, the shape of the electron beam passage hole of each electrode will be described.
And will be described sequentially. First auxiliary electrode 10 of extraction electrode 9
A vertically long rectangular recess with the long axis in the vertical direction
27a, 27b and 27c are provided. Also, the first auxiliary electrode
10 also has a long horizontal direction on the surface facing the extraction electrode 9.
Horizontal rectangular recesses 28a, 28b, 28c are provided as axes.
The horizontal direction is also the major axis on the surface facing the second auxiliary electrode 11.
Horizontal rectangular recesses 16a, 16b, 16c
You. The second auxiliary electrode 11 has a vertically long
Rectangular openings 17a, 17b, 17c are provided. Also, the first
The focusing electrode 12 is horizontal on a surface facing the second auxiliary electrode 11.
Horizontally long rectangular openings 18a, 18b, 18 whose major axis is the direction
c, and the direction perpendicular to the surface facing the second focusing electrode 13 is
Longitudinal rectangular openings 19a, 19b, 19c are provided as long axes.
I can. Also, the second focusing electrode 13 is paired with the first focusing electrode 12.
A horizontally long rectangular opening 20 whose major axis is the horizontal direction is provided on the facing surface.
a, 20b, and 20c, and the second focusing electrode 13 and the final
The main lens 3 is provided on the surface facing the speed electrode 14 respectively.
Openings 21a, 21b, 21c and 22 for forming
a, 22b and 22c are provided. By the way, two-stage variable intensities having opposite polarities.
Problems of the conventional in-line type electron gun equipped with a quadrupole lens
Is the first variable intensity quadrupole lens,
This is due to the function of the focusing lens in the vertical direction. That is,
Achieves the objective of reducing the horizontal magnification at the periphery of the screen
In order to achieve this, the first variable intensity quadrupole lens is
Even though the diverging lens action alone is sufficient,
In principle, it is difficult to form such a divergent lens by itself
Therefore, I had to substitute a four-pole lens,
As a result, unintentional due to vertical focusing lens action
The effect appeared. In-line type according to the present invention
The characteristic means of the electron gun, ie, before the first variable intensity quadrupole lens
The non-axisymmetric lens as described above provided on the step
For the vertical focusing lens action of the first variable intensity quadrupole lens
The effect of this is diminished. The operation is described below.
I do. Vertical focusing of the first variable intensity quadrupole lens
An effective way to reduce the effects of lens action is
Virtual hypothesis of the electron beam incident on the variable intensity quadrupole lens
The object point must be located downstream from the virtual object point in the horizontal direction.
And FIG. 5 is a ray diagram for explaining the principle.
You. FIG. 2A shows the incident light on the first variable intensity quadrupole lens 6.
The vertical virtual object point 23 of the electron beam is the horizontal virtual object point.
24, and FIG. 14B shows the vertical temporary
The virtual object point 23 is located downstream of the virtual virtual object point 24 in the horizontal direction.
This shows the state of the light beam in the case of performing the operation. Now the first variable strength 4-pole
The intensity of the lens 6 increases in synchronization with the deflection angle of the electron beam.
Focus on the vertical ray state after the lens exits
Then, in both figures, the electron beam 1
The vertical virtual object point position 25 is the original vertical virtual object point position.
Retreats upstream from the device 23, and
The divergence angle becomes smaller. Each of these phenomena
Increasing the voltage amplitude of the dynamic focus voltage and the screen circumference
It has already been mentioned that this is the cause of vertical resolution degradation at the edge.
Was. However, when comparing their sizes, the vertical
The change of the vertical divergence angle Δθ and the retreat distance of the vertical virtual object point
Is smaller in FIG. 5 (b) than in FIG. 5 (a). I.e.
As shown in FIG. 5 (b), the light enters the first variable intensity quadrupole lens 6.
The virtual virtual object point 23 of the electron beam 1 is virtual in the horizontal direction.
The state of the ray located as far downstream as possible from the object point 24
If it can be realized, vertical resolution degradation and dynamic
The increase in the voltage amplitude of the back focus voltage is reduced
I understand. Non-axisymmetric lens which is a characteristic means of the present invention
The dynamic focus voltage
Convergence in the horizontal direction and divergence in the vertical direction
Non-axisymmetric lens with or with horizontal focusing
Focusing that is effective and weaker in the vertical direction than in the horizontal direction
The non-axisymmetric lens that has
Being provided for up to one variable intensity quadrupole lens
5B realizes a light beam state equivalent to that of FIG.
It plays a major role in achieving goals. Figure 6 shows the above non-axis
FIG. 4 is a ray diagram for explaining the operation of a symmetric lens. example
For example, as shown in FIG.
Non-axisymmetric lens 2 having a diverging effect in the vertical direction
6a provided before the first variable intensity quadrupole lens 6,
Virtual of electron beam 1 incident on one variable intensity quadrupole lens 6
The object point is such that the vertical virtual object point 23 is the horizontal virtual object point 24.
The light state equivalent to that in FIG.
Is achieved. Also, as shown in FIG.
Has a focusing action and is weaker in the vertical direction than in the horizontal direction.
The non-axisymmetric lens 26b having a bundling action is moved to the first variable intensity 4
Even if it is provided before the polar lens 6, it is also equivalent to FIG.
Light state is realized. Therefore, according to the electron gun having the above configuration,
If the electron beam is deflected to the periphery of the screen,
When the focus voltage Vfd rises, the second focusing electrode 1
Main lens formed at the opposing part of the third acceleration electrode 14
3 is weakened, and the first auxiliary electrode 10 and the second auxiliary electrode 1
1 and the second auxiliary electrode 11 and the first focusing electrode 12
Both have a divergent action in the horizontal direction and a vertical
Variable intensity lens with focusing action in one direction, i.e. first variable
An intensity quadrupole lens 6 is formed, and a first focusing electrode 12 and
The portion facing the second focusing electrode 13 has a horizontal focusing action.
A variable intensity lens having a diverging effect in the vertical direction,
That is, since the second variable intensity quadrupole lens 5 is formed,
Dynamic Four-Position Lenses
A scum system can be formed. Also, the extraction electrode 9
A dynamic forehead is provided at a portion facing the first auxiliary electrode 10.
Focusing in the horizontal direction regardless of the change in the focus voltage Vfd
And a non-axisymmetric laser with vertical divergence
Can be formed. As described above, according to the first embodiment of the present invention.
In the in-line type electron gun, the extraction electrode 9 and the second
(1) Dynamic focus on the part facing the auxiliary electrode 10
Regardless of the change in the voltage Vfd, the focusing operation is performed in the horizontal direction.
Non-axisymmetric lens with vertical divergence
Forming the first variable intensity quadrupole lens
Vertical virtual object point of electron beam incident on 6
It can be located downstream from the virtual object point
Therefore, as described above, in synchronization with the increase in the deflection angle,
(1) Drop of electron beam when the variable intensity quadrupole lens 6 is strengthened
Reduce the change of the vertical divergence angle and the retreat distance of the virtual virtual object point
And therefore the vertical resolution at the periphery of the screen is poor.
And increase of voltage amplitude of dynamic focus voltage
Can be killed. In the first embodiment, the
Non-axis formed at the opposed portion between the first electrode 9 and the first auxiliary electrode 10
The symmetric lens 26 has a focusing function in the horizontal direction, and
Described as a lens that has a diverging effect in the vertical direction
However, depending on the design conditions of the entire stage of the electron gun,
２６ ２６ 束 に 水平 ２６ ２６ ２６ ２６ ２６ ２６
It is better to use a lens that has a weaker focusing action than the horizontal direction
It may be appropriate. Such a non-axisymmetric lens
Provided at the facing portion between the extraction electrode 9 and the first auxiliary electrode 10
Easily by changing the shape of the rectangular recess and the electrode spacing
realizable. However, in such a case as well,
That the intended purpose of the invention can be achieved.
It is. In the first embodiment, the extraction electrode 9
And the first rectangular recesses 27a, 27b, 27c
Horizontally elongated rectangular recesses 28a, 28b provided in the auxiliary electrode 10,
28c, the non-axisymmetric lens 26
Has been shown, but the required non-axisymmetric lens
Depending on the strength conditions, for example, one rectangular
It may be possible to change to a part. As is well known, a non-axisymmetric lens is formed.
The means for performing is not limited to the one using the rectangular concave portion. Off axis
Another means of forming a symmetric lens is shown in FIG. Withdraw
As shown in a front view (a) of FIG.
Vertical impact projected from the left and right positions of each electron beam passage hole
A vertical member 29 is provided, and the first auxiliary electrode 10 has a front surface.
As shown in FIG. 2B, each electron beam passage hole of the electrode is provided.
A horizontal partition 30 protruding from the upper and lower positions of the
The vertical partition 29 and the horizontal partition 30
Face each other as shown in the horizontal sectional view (c).
Deploy. By such means, non-axisymmetric lens
Can be formed. Other than the present invention described below,
In the embodiment described above, there may be a similar deformation. Embodiment 2 FIG. Next, an embodiment of the present invention
2 will be described. The above
In the first embodiment, the non-
The axisymmetric lens is connected to the electrode to which the extraction voltage Vg is applied.
An electrode to which a static focus voltage Vfs is applied;
However, depending on the structure of the electron gun,
Electrode to which output voltage Vg is applied and dynamic focus
To be formed at the portion facing the electrode to which the voltage Vfd is applied
Is sometimes preferred. FIG. 3 shows Embodiment 2 of the present invention.
Of In-Line Type Electron Gun Including Prefocusing Lens
FIG. In the figure, 7a, 7b, 7
c is three cathodes arranged inline, 8 is a grid.
Electrode 9 is a lead electrode, and 3
It constitutes a three-pole part for generating a book electron beam. 31
Is a first preliminary focusing electrode, 32 is a second preliminary focusing electrode, 33 is
An auxiliary electrode, 12 is a first focusing electrode, 13 is a second focusing electrode,
Reference numeral 14 denotes a final acceleration electrode to which an anode voltage is applied.
The first preliminary focusing electrode 31 and the first focusing electrode 12 have a constant voltage.
Of static focus voltage Vfs
The electrode 33 and the second focusing electrode 13 have a constant voltage and a deflection angle.
Dynamics in which the voltage that rises in synchronization with the
The focus voltage Vfd is applied. Also the extraction electrode
9 and the second preliminary focusing electrode 32
Voltage Vfs and dynamic focus voltage Vfd
A constant voltage Vg having a lower potential than any of them is applied. First
A focusing lens 31, a second preliminary focusing lens 32 and an auxiliary power
The poles 33 form a preliminary focusing lens section. Next, the shape of the electron beam passage hole of each electrode will be described.
And will be described sequentially. The extraction electrode 9 has a circular opening 34.
a, 34b and 34c are provided. Also, a first preliminary focusing electrode
31 has circular openings 35a, 35b, 35c and 36a,
36b and 36c are provided. Also, the second preliminary focusing electrode 32
Has a circular opening 37 on the surface facing the first preliminary focusing electrode 31.
a, 37b, and 37c are provided, and a surface facing the auxiliary electrode 33 is provided.
Vertically long rectangular recesses 38a, 38 having a long axis in the vertical direction.
b and 38c are provided. The auxiliary electrode 33 has a second preliminary
Horizontal surface with the long axis in the horizontal direction on the surface facing the focusing electrode 32
Rectangular concave portions 39a, 39b, 39c,
A vertically long rectangle whose major axis is perpendicular to the surface facing the pole 12
Depressions 40a, 40b, 40c are provided. First focusing electrode 1
2 has a long axis in the horizontal direction on the surface facing the auxiliary electrode 33.
Horizontal rectangular openings 18a, 18b, 18c
Longitudinal with the long axis perpendicular to the surface facing the focusing electrode 13
Rectangular openings 19a, 19b, and 19c are provided. Also,
Water is applied to the surface of the two focusing electrodes 13 facing the first focusing electrode 12.
Horizontally long rectangular openings 20a, 20b, 2
0c, the second focusing electrode 13 and the final accelerating electrode 14
For forming the main lens 3 on the opposing surfaces,
Openings 21a, 21b, 21c and 22a, 22b, 22
c is provided. According to the electron gun configured as described above, the electron gun
When the beam is deflected to the periphery of the screen,
Due to the rise of the cas voltage Vfd, the second focusing electrode 13 and the final
The main lens 3 formed at the portion facing the acceleration electrode 14 is weak
Of the auxiliary electrode 33 and the first focusing electrode 12
Has a diverging effect in the horizontal direction and a focusing effect in the vertical direction
Variable-intensity lens, ie, first variable-intensity quadrupole lens
6 are formed, and the first focusing electrode 12 and the second focusing electrode 1 are formed.
3 has a focusing function in the horizontal direction, and
Variable intensity lens having a diverging effect in the direction, that is, a second variable intensity lens
Since a quadrupole lens 5 is formed, a variable strength of two steps of opposite polarity is provided.
Construct a dynamic focus system with a 4-pole lens
Can be Further, the second preliminary focusing electrode 32 and the auxiliary
The dynamic focus voltage V
Even if fd changes, the focusing action always occurs in the horizontal direction.
Non-axisymmetrical with vertical divergence
A lens 26 can be formed. A non-axisymmetric lens which is a characteristic means of the present invention.
Between the extraction electrode 9 and the first preliminary focusing electrode 31
Section or first preliminary focusing electrode 31 and second preliminary focusing electrode
Although it is possible to form it at the opposite part of the electrode part 32,
Unless there are special restrictions such as product manufacturing issues,
A part adjacent to the first variable-intensity quadrupole lens 6 as in state 2.
Is more suitable for the first variable intensity quadrupole lens 6.
Between the horizontal virtual object position and the vertical virtual object position
It has the advantage that a large distance difference can be secured.
No. As in the second embodiment, the non-axisymmetric
Between the electrode and the electrode to which the extraction voltage Vg is applied.
Facing the electrode to which the focus voltage Vfd is applied
When forming the dynamic focus voltage Vfd
Influence of intensity fluctuation of non-axisymmetric lens with change (for example, water
Decrease in dynamic modulation of horizontal magnification)
However, a typical color picture tube has a dynamic focus
Even if the focus voltage Vfd changes within the usage standard range, the second
Fluctuation of the voltage difference between the preliminary focusing electrode 32 and the auxiliary electrode 33
The rate is at most about 10%, which is practically large.
This is not a problem. Therefore, static focus
The electrode to which the scanning voltage Vfs is applied is connected to the second preliminary focusing electrode 32.
Between the electrode and the auxiliary electrode 33 and the second electrode
Form a non-axisymmetric lens between the focusing electrode 32 and the like
There is no need to take redundant measures. As described above, the inlay according to the second embodiment is
Like an in-type electron gun, the voltage to which the extraction voltage Vg is applied
Electrode to which the dynamic focus voltage Vfd is applied.
Even if a non-axisymmetric lens is formed at the part facing the pole,
Target can be achieved. Embodiment 3 Next, an embodiment of the present invention
3 will be described. The fruit
In the first and second embodiments, the non-axisymmetric lens
Is related to the change of the dynamic focus voltage Vfd.
Work to make the electron beam longer and flatter in the vertical direction.
The first variable intensity quadrupole lens and the second variable intensity
In the center of the screen where the intensity quadrupole is inactive, horizontal
And the vertical magnification may be unbalanced.
When such a magnification imbalance is a significant obstacle to practical use.
In the horizontal direction before the non-axisymmetric lens.
A second having a dispersing action and a focusing action in the vertical direction
May be formed. FIG.
The in-camera provided with the second non-axisymmetric lens according to the third embodiment.
FIG. 2 is a horizontal sectional view showing a configuration of a line type electron gun. In the figure
9 is an extraction electrode, and 31 is a first preliminary focusing electrode.
You. Opposed to the first preliminary focusing electrode 31 of the extraction electrode 9
The surface has horizontally long rectangular recesses 41a and 4
1b and 41c are provided. Also, pulling of the first preliminary focusing electrode 31
The surface facing the extraction electrode 9 has a vertical
Long rectangular openings 42a, 42b, 42c are provided. Other
Regarding the structure of the members and the voltage application method,
Since it is the same as FIG. 3 showing the second embodiment, the description is omitted.
You. According to the electron gun configured as described above, the second
The opposite portion of the preliminary focusing electrode 32 and the auxiliary electrode 33
Has a focusing effect in the vertical direction and a divergent effect in the vertical direction.
That the non-axisymmetric lens 26 can be formed,
Same as mode 2, but additionally, the extraction electrode 9 and the first
In the part facing the preliminary focusing electrode 31, divergent
And a second focusing element having a focusing action in the vertical direction.
An axisymmetric lens 43 can be formed. Regardless of whether the lens is a focusing lens or a diverging lens,
Generally, for an electron lens, the divergence angle of the electron beam before and after the lens
(Or convergence angle) so that the amount of change becomes a certain value.
When determining the lens strength, position the lens close to the object point.
The virtual object point for the subsequent lens
Movement amount becomes small. In other words, make the lens as objective as possible
If placed closer, the virtual object point position will change significantly
The divergence angle of the electron beam can be controlled without
You. Therefore, as in the third embodiment, the extraction electrode 9
And a second preliminary focusing electrode 31
The strength of the non-axisymmetric lens 43 and the second preliminary focusing electrode 32
Non-axisymmetric lens 2 formed at a portion facing auxiliary electrode 33
6 can be combined properly to obtain the first variable intensity quadrupole
Horizontal and vertical virtual object points for lens 6
After exiting the non-axisymmetric lens 26 while maintaining the distance
Between the horizontal and vertical divergence angles of the electron beam
The balance can be reduced. As described above, the inlay according to the third embodiment is
According to the in-type electron gun, the horizontal direction at the center of the screen and
Without deviating the vertical magnification from the appropriate range,
The purpose of the period can be achieved. As described above, the in-line type according to the present invention
In the electron gun, a die is provided before the first variable quadrupole lens.
Horizontal direction regardless of the change of the dynamic focus voltage
Has a focusing action and a diverging action in the vertical direction.
Axisymmetric lens, or has a horizontal focusing effect,
And has a weaker focusing effect in the vertical direction than in the horizontal direction.
Horizontal and vertical resolutions are provided by using an axisymmetric lens.
With an in-line type electron gun that can obtain good images
Wear. The voltage of the dynamic focus voltage
Dynamic focus because the increase in amplitude can be reduced
The one that has the excellent effect that the power supply can be manufactured at low cost.
It is. [0045]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a horizontal sectional view showing a configuration of an in-line type electron gun according to Embodiment 1 of the present invention. FIG. 2 is a view showing another means for forming a non-axisymmetric lens of the in-line type electron gun according to the first embodiment of the present invention; FIG. 3 is a horizontal sectional view showing a configuration of an inline-type electron gun according to Embodiment 2 of the present invention. FIG. 4 is a horizontal sectional view showing a configuration of an in-line type electron gun according to Embodiment 3 of the present invention. FIG. 5 is a ray diagram showing both a vertical direction and a horizontal direction for describing a principle of reducing deterioration in vertical resolution and an increase in voltage amplitude of a dynamic focus voltage in a peripheral portion of a screen according to the present invention. FIG. 6 is a ray diagram showing both the vertical direction and the horizontal direction for explaining the operation of the non-axisymmetric lens according to the present invention. FIG. 7 is a ray diagram showing the image formation state of an electron beam by an in-line type electron gun having a single-stage variable-intensity quadrupole lens according to the related art, in both vertical and horizontal directions. FIG. 8 is a ray diagram showing the image formation state of an electron beam by an in-line type electron gun equipped with a two-stage variable-intensity quadrupole lens having opposite polarities according to the related art in both vertical and horizontal directions. FIG. 9 is a horizontal cross-sectional view showing a configuration of an in-line type electron gun provided with a two-stage variable intensity quadrupole lens having opposite polarities according to the related art. [Description of Signs] 3 main lens, 5 second variable intensity quadrupole lens, 6 first
Variable intensity quadrupole lens, 7a, 7b, 7c cathode, 8
Grid electrode, 9 extraction electrode, 10 first auxiliary electrode, 11 second auxiliary electrode, 12 first focusing electrode, 13
2nd focusing electrode, 14 final accelerating electrode, 26 non-axisymmetric lens, 27a 27b, 27c, 28a, 28b, 28
c, 38a, 38b, 38c, 39a, 39b, 39
c, 41a, 41b, 41c Rectangular recess, 29 vertical partition, 30 horizontal partition, 31 first
Pre-focusing electrode, 32 Second pre-focusing electrode, 33 Auxiliary electrode, 43 Second non-axisymmetric lens, Vfs static focus voltage, Vfd dynamic focus voltage.

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-3-93135 (JP, A) JP-A-3-280333 (JP, A) JP-A-3-53433 (JP, A) JP-A-6-53433 187921 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01J 29/48-29/50

Claims (1)

(57) [Claim 1] A main unit for converging an electron beam on a screen surface from an electron beam generation unit composed of three cathodes arranged in line, a grid electrode and a lead electrode. Between the lenses, at least a first quadrupole lens and a second quadrupole lens are arranged in this order, and the first quadrupole lens and the second quadrupole lens increase an electron beam deflection angle. The main lens is formed at a portion where an electrode to which a dynamic focus voltage that rises in synchronization with the electrode is applied and an electrode to which a constant static focus voltage is applied are formed. The dynamic focus voltage, which is formed in a portion facing the electrode to which the focus voltage is applied and rises in synchronization with an increase in the deflection angle of the electron beam, 1
The quadrupole lens has a horizontal divergence effect and a vertical convergence effect, and the second quadrupole lens has a horizontal convergence effect and a vertical divergence effect. Is an in-line type electron gun configured to weaken the focusing action, wherein the first 4
Between the polar lens, a non-focusing element having a horizontal focusing action and a vertical diverging action, or having a horizontal focusing action and a vertical weaker focusing action than the horizontal direction. An in-line type electron gun characterized by forming an axisymmetric lens.