JP2000123759A - Color picture tube device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color picture tube having high resolution throughout its total screen area and excellent in reliability by improving a breakdown voltage characteristic of a dynamic focus electron gun and correcting the astigmatism of a deflection yoke with the electron gun. SOLUTION: In a color picture tube provided with an electron gun to emit three electron beams arranged in line, a main lens part ML is so structured that at least a first through a fourth electrodes G4-G7 are provided for it, the second electrode is divided into three electrodes G5B, G5G, G5R arranged in parallel with one another in the direction of the three beam arrangement, the divided electrodes are connected to the third electrode G6 through a first through a third resistors 23B, 23G, 23R having different resistance values, a dynamic voltage is applied to the third electrode, and thereby, a multipolar lens QL of which lens intensity varies according to deflection frequencies is formed between the second and third electrodes.

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 apparatus having a dynamic focus type electron gun for compensating for deflection aberration caused by a magnetic field generated by a deflection yoke.

[0002]

2. Description of the Related Art As shown in FIG. 8, a color picture tube apparatus generally has a panel 1 and an envelope composed of a funnel 2 joined to the panel 1, and the panel 1 has a funnel.
Is provided on the inner surface thereof a phosphor screen 3 composed of a striped or dot-shaped three-color phosphor layer that emits blue, green, and red light. A plurality of apertures are provided inside the phosphor screen 3 in opposition to the phosphor screen 3. The formed shadow mask 4
Is arranged. On the other hand, an electron gun 8 which emits three electron beams 7B, 7G, 7R in the neck 6 of the funnel 2
Are arranged. Also, the above 3
A deflection yoke 9 for generating horizontal and vertical deflection magnetic fields for deflecting the electron beams 7B, 7G, 7R is mounted. The three electron beams 7B and 7 emitted from the electron gun 8 are used.
G, 7R are deflected by the horizontal and vertical deflection magnetic fields generated by the deflection yoke 9, and the phosphor screen 3 is horizontally and vertically scanned through the shadow mask 4, thereby forming a structure for displaying a color image.

At present, such a color picture tube device emits three electron beams 7B, 7G, 7R arranged in a line composed of a center beam 7G and a pair of side beams 7B, 7R passing through the electron gun 8 on the same horizontal plane. The horizontal deflection magnetic field generated by the deflection yoke 9 is a pincushion type, and the vertical deflection magnetic field is a barrel type. The three electron beams 7B, 7G, 7R arranged in a line are concentrated by the horizontal and vertical deflection magnetic fields. Self convergence
In-line color picture tube devices have been widely put into practical use.

In general, the electron gun 8 is disposed adjacent to the cathode and the cathode in order, controls the emission of electrons from the cathode, and focuses the emitted electrons to form a three-electron gun.
An electron beam generating section comprising a plurality of electrodes for forming the electron beams 7B, 7G, 7R, and three electron beams 7B, 7G, 7R from the electron beam generating section are applied to the phosphor screen 3.
And a main lens portion composed of a plurality of electrodes converged thereon.

In such a color picture tube device, in order to improve the image quality displayed on the phosphor screen 3, the three electron beams 7B and 7B emitted from the electron gun 8 are used.
It is necessary to appropriately focus 7G and 7R over the entire surface of the phosphor screen 3. However, as in the self-convergence in-line type color picture tube apparatus, the horizontal deflection magnetic field for deflecting the three electron beams 7B, 7G, 7R emitted from the electron gun 8 is a pincushion type, and the vertical deflection magnetic field is a barrel. When a non-uniform magnetic field having a shape is used, each of the electron beams 7B, 7G, and 7R receives astigmatism.

For example, the pincushion-type horizontal deflection magnetic field will be described. As shown in FIG. 9A, the electron beam 7 (7B, 7G, 7R) is caused by the pincushion-type horizontal deflection magnetic field 11 in the directions of arrows 12H and 12V. (B), the beam spot 13 at the peripheral portion of the screen is over-focused in the vertical direction due to the deflection aberration,
The core portion 14 becomes horizontally long, and is distorted into a shape in which halo portions 15 (bleeding) occur above and below the core portion 14. In addition, the deflection aberration becomes larger as the tube becomes larger and the deflection angle becomes wider, and the resolution of the peripheral portion of the screen is significantly deteriorated.

[0007] JP-A-61-99249, JP-A-6-99249
Japanese Patent Application Laid-Open No. 1-250934 and Japanese Patent Application Laid-Open No. 2-72549 disclose a dynamic focus type electron gun that solves the degradation 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. 10A, and each of them has a cathode K and a first gun arranged in the direction of the phosphor screen from the cathode K. To an electron beam generator GE, a quadrupole lens QL, and a final focusing lens EL along the traveling direction of the electron beam from the cathode K. The quadrupole lens QL has a vertically long non-circular electron beam passage hole 17 on the surface of the third grid G3 facing the fourth grid G4, as shown in FIG. It is formed by providing a horizontally long non-circular electron beam passage hole 18 on the surface facing G3 as shown in FIG.

FIG. 11 equivalently shows correction of deflection aberration by the electron gun using an optical lens. The upper part of the tube axis (Z axis) is in the vertical direction (V axis direction), and the lower part is in the horizontal direction (V axis direction). When the electron beam 7 from the cathode K is not deflected by the deflection yoke 9 and goes to the center of the phosphor screen 3, the potentials of the third grid and the fourth grid are set to the same value, and the quadrupole lens QL is not formed. As shown by the solid line, the electron beam 7 is appropriately focused on the center of the phosphor screen 3 by the final focusing lens EL. On the other hand, when the electron beam 7 is deflected by the deflection yoke 9 and goes to the peripheral portion of the phosphor screen 3, the potential of the fourth grid is increased, and as shown by the broken line, the third grid and the fourth grid are moved.
A quadrupole lens QL is formed by a grid to focus the electron beam in the horizontal direction and diverge in the vertical direction.
The horizontal and vertical focusing actions of the final focusing lens EL are weakened. As a result, the electron beam 7 is insufficiently focused in the vertical direction, but receives the focusing action due to the deflection aberration (astigmatism) and is appropriately focused. On the other hand, in the horizontal direction, the convergence action of the quadrupole lens QL and the reduction of the convergence action of the final converging lens EL hardly change overall.
Due to the magnetic field generated by the deflection yoke 9, the beam is slightly under-focused. However, since the peripheral portion of the phosphor screen 3 is farther from the electron gun than the central portion, it is appropriately focused also in the horizontal direction.

[0010]

As described above, the electron gun is of an in-line type that emits three electron beams arranged in a line, and the three electron beams emitted from the electron gun are generated by an asymmetric magnetic field generated by a deflection yoke. In a self-convergence in-line color picture tube device that deflects, the beam spot around the screen is distorted due to astigmatism (deflection aberration) due to the non-uniform magnetic field. This deflection aberration becomes larger as the tube becomes larger and the deflection angle becomes wider, and the resolution at the peripheral portion of the screen is significantly deteriorated.

As an electron gun for resolving the deterioration of the resolution at the peripheral portion of the screen, the electron gun has a cathode and first to fifth grids arranged from the cathode in the direction of the phosphor screen, and in the traveling direction of the electron beam from the cathode. Along with this, a dynamic focus type electron gun that forms an electron beam generator, a quadrupole lens, and a final focusing lens has been proposed.

However, in this electron gun, a medium voltage of about 5 to 10 kV must be applied to the third grid and the fourth grid forming the quadrupole lens, so that two voltage supply circuits are required. The cost is high. Another problem is the withstand voltage characteristic of the voltage supply unit such as the stem and the socket. Further, the length of the lead wire connected to supply a predetermined voltage to each electrode becomes longer, lowering the withstand voltage, making it easier for discharge and leakage current to occur, and deteriorating the focusing characteristics of the electron beam. There is a problem that the performance and reliability of the device are impaired.

Further, since the three electron beams reach the phosphor screen through different positions of the horizontal and vertical magnetic fields,
When a predetermined dynamic focus voltage is supplied to the fourth grid, a difference occurs in the convergence characteristics of a pair of side beams deflected particularly to the periphery of the screen. As shown in FIG. In the right direction, the beam spot 13B of one side beam 7B
As compared with the (blue beam spot), the core 14 of the beam spot 13R (red beam spot) of the other side beam 7R outside the core 14 is greatly crushed, and the upper and lower halo portions 15 are larger. Conversely, in the negative left direction horizontally,
Compared with the beam spot 13R of the other side beam 7R, the core 14 of the beam spot 13B of the one side beam 7B on the outer side is greatly crushed, and the upper and lower halo portions 15 are larger. That is, there is a problem that the dynamic focus voltage for the other side beam in the horizontal positive direction of the screen and for one side beam in the horizontal negative direction tends to be insufficient.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has improved the withstand voltage characteristics of a dynamic focus type electron gun. It is an object of the present invention to constitute a color picture tube device having high resolution over the entire screen and high reliability by correcting aberrations.

[0015]

(1) An electron beam generator which emits three electron beams arranged in a line composed of a center beam and a pair of side beams passing on the same plane, and an electron beam from the electron beam generator. In a color picture tube device comprising an electron gun having a main lens portion composed of a plurality of electrodes focused on a phosphor screen and a deflection yoke for deflecting three electron beams emitted from the electron gun, the main lens portion is , At least first, second, third,
It has a fourth electrode, and among these electrodes, the first, third, and fourth electrodes are integrated electrodes, and the second electrode is three electrodes arranged in parallel in the direction in which three electron beams are arranged. And divide the three electrodes into first and second electrodes having different resistance values.
Connected to the third electrode via the second and third resistors,
The predetermined DC voltage is applied to the electrode, the anode voltage is applied to the fourth electrode,
A dynamic voltage in which a voltage that changes in synchronization with the deflection of the electron beam of the deflection yoke is superimposed on a predetermined DC voltage is applied to the electrodes, and a lens is applied between the second and third electrodes according to the deflection frequency of the deflection yoke. Was formed in a structure for forming a multipole lens having a variable intensity.

(2) An electron beam generator that emits three electron beams arranged in a row composed of a center beam and a pair of side beams passing on the same plane, and the electron beams from the electron beam generator are focused on a phosphor screen. An electron gun having a main lens portion composed of a plurality of electrodes,
In a color picture tube device provided with a deflection yoke for deflecting three electron beams emitted from the electron gun, the main lens portion has at least first, second, third, and fourth electrodes, and Among them, the first, third, and fourth electrodes are electrodes having an integral structure, and the second electrode is divided into three electrodes arranged in parallel in the direction in which the three electron beams are arranged. Are connected to a third electrode via first, second, and third resistors having different resistance values, respectively, and the third and fourth electrodes are connected via a fourth resistor. A predetermined DC voltage is applied to the electrode, and an anode voltage is applied to the fourth electrode, and the anode voltage is changed to a DC voltage divided by a fourth resistor in synchronization with the deflection of the electron beam by the deflection yoke. A dynamic voltage on which a voltage is superimposed is applied to deflect the deflection yoke between the second and third electrodes. It was formed in the structure to form a multipole lens strength of the lens is changed depending on the wave number.

(3) In the color picture tube device of (1) or (2), the capacitance between the first electrode and the divided three electrodes of the second electrode and the first and second electrodes are set. In this structure, different dynamic voltage AC voltage components are applied to the three divided electrodes of the second electrode based on the resistance value of the third resistor.

(4) In the color picture tube device of (3), the first and third electrodes connected to the electrodes on both sides in the arrangement direction of three electron beams among the three divided electrodes of the second electrode. The resistance value of the resistor is RB, RR, the resistance value of the second resistor connected to the center electrode is RG, and three of the three divided electrodes of the second electrode are on both sides in the arrangement direction of the electron beam. The capacitance between the third electrode and the third electrode is CB, CR, the capacitance between the center electrode and the third electrode is CG, the horizontal deflection frequency of the electron beam is fH, and the vertical deflection frequency is When fV and pi are π, RB ≧ 1 / 2πfH CB RG ≧ 1 / 2πfH CG RR ≧ 1 / 2πfH CR and RB ≦ 1 / 2πfV CB RG ≦ 1 / 2πfV CG RR ≦ 1 / 2πfVCR Structured.

(5) In the color picture tube device of (1) or (2), the third electrode is connected to an extra tube resistor.

[0020]

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

FIG. 1 shows a color picture tube device which is one embodiment of the present invention. This color picture tube device has a panel 1 and an envelope composed of a funnel 2 joined to the panel 1, and a striped blue, green, and red light emitting panel 3 is provided on the inner surface of the panel 1. A phosphor screen 3 made of a color phosphor layer is provided, and a shadow mask 4 having a large number of apertures is arranged inside the phosphor screen 3 so as to face the phosphor screen 3. On the other hand, in the neck 6 of the funnel 2, the center beam 20G passing on the same horizontal plane
Further, an electron gun 21 for emitting three electron beams 20B, 20G, 20R arranged in a line composed of a pair of side beams 20B, 20R is provided. A deflection yoke 9 for generating horizontal and vertical deflection magnetic fields for deflecting the three electron beams 20B, 20G, and 20R is mounted outside the funnel 2. The three electron beams 20B, 20G, and 20R emitted from the electron gun 21 are deflected by the horizontal and vertical deflection magnetic fields generated by the deflection yoke 9 to scan the phosphor screen 3 horizontally and vertically via the shadow mask 4. Thereby, it is formed in a structure for displaying a color image.

As shown in FIG. 2, the electron gun 21 has three cathodes KB, KG, and 3 arranged in a line in the horizontal direction.
KR, three heaters H for separately heating the cathodes KB, KG, KR, and the cathodes KB, KG, K
There are first to seventh grids G1 and G7 which are sequentially arranged at predetermined intervals from R in the phosphor screen direction.

The first grid G1 and the second grid G2
Is a plate-like electrode having an integral structure, a third grid G3, a fourth grid G4 (a first electrode), a fifth grid G5 (a second electrode), and a sixth grid G6 (a third electrode) are integral structures. And the seventh grid G7 (fourth electrode) is formed of a cup-shaped electrode.

Particularly in this embodiment, the fifth grid G5 is divided into three electrodes G5B, G5G, G5R which are arranged in parallel in the arrangement direction of three electron beams (horizontal direction: H-axis direction). G5B, G5G, and G5R are provided with first, second, and third resistors 23B, 23G,. It is connected to the sixth grid G6 via 23R.

The plate surfaces of the first and second grids G1 and G2 correspond to the cathodes KB, KG and KR, respectively.
Three substantially circular electron beam passage holes are formed in a line. On the surface of the third grid G3 facing the second grid G2, three substantially circular electron beam passage holes larger than the electron beam passage holes of the second grid G2 corresponding to the cathodes KB, KG and KR. Are formed in a line. Cathodes KB and KB are respectively provided on the surface of the third grid G3 facing the fourth grid G4 and on the fourth grid G4.
Three substantially circular electron beam passage holes larger than the electron beam passage holes on the surface of the third grid G3 facing the second grid G2 are formed in a row corresponding to KG and KR. Each divided electrode G5B, G5G of the fifth grid G5,
G5R facing the fourth grid G4, sixth grid G6
And the surface facing the seventh grid G7 and the seventh grid G7
Respectively correspond to the cathodes KB, KG, KR,
Three substantially circular electron beam passage holes larger than the electron beam passage holes of the fourth grid G4 are formed in a line. Further, on the surface of each of the divided electrodes G5B, G5G, G5R of the fifth grid G5 facing the sixth grid G6, corresponding to the cathodes KB, KG, KR, FIG.
As shown in the figure, three vertically long non-circular electron beam passage holes 2
5 are formed. On the surface of the sixth grid G6 facing each of the divided electrodes G5B, G5G, G5R of the fifth grid G5, three horizontally long portions corresponding to the cathodes KB, KG, KR as shown in FIG. Non-circular electron beam passage hole 26
Are formed.

In the electron gun 21, the cathodes KB, KG
, KR and the first to third grids G1 to G3 control the electron emission from each of the cathodes KB, KG, KR and accelerate and focus the emitted electrons to form three electron beams arranged in a line. A generation part GE is formed,
The third to seventh grids G3 to G7 form a main lens unit ML that focuses the three electron beams from the electron beam generator GE onto the phosphor screen. The main lens portion ML includes divided electrodes G5B, G5G, G5R of the fifth grid G5 in which a vertically long non-circular electron beam passage hole 25 is formed on the surface facing the sixth grid G6, and these divided electrodes G5B,
A multipole lens QL (quadrupole lens) formed between a sixth grid G6 having a horizontally long non-circular electron beam passage hole 26 formed on a surface facing G5G and G5R;
6 and a final focusing lens EL formed between the seventh grid G7.

In such an electron gun 21, the anode terminal 29 provided on the large diameter part 28 of the funnel 2 and the inner surface of the part adjacent to the neck 6 from the large diameter part 28 are formed on the seventh grid G7. An anode high voltage Eb of 25 to 35 kV is applied from a high voltage power supply 31 via the inner conductive film 30 (see FIG. 1) and the like. 6th grid G6 and 3rd grid G
3 are connected in a tube, and these electrodes are connected to an electron gun power supply 35 via a variable resistor 32 provided outside the tube and a stem pin 34 (see FIG. 1) provided on a stem 33 at the end of the neck 6. Thus, a dynamic focus voltage is applied in which a DC voltage Vf of about 20 to 35% of the anode high voltage Eb is superimposed with a parabolic voltage Vd which changes in synchronization with the deflection of the electron beam. The sixth grid G6 includes first, second, and third resistors 23B, 23G. 23R, each divided electrode G5B, G5G, G5R of the fifth grid G5.
, A voltage described later is applied. The fourth grid G4 and the second grid G2 are connected in a tube, and these electrodes are connected to the electron gun power supply 35 through the stem pin 34 from the electron gun power supply 35.
A voltage of about 00 to 1000 V is applied. The first grid G1 is grounded, and the cathodes KB, KG and KR have 1
A voltage in which a video signal is superimposed on a voltage of about 00 to 200 V is applied.

Each of the divided electrodes G5B,
G5G and G5R have first, second and third resistors 23B and 2B, respectively.
3G. At least a direct current component of the dynamic focus voltage applied to the sixth grid G6 is supplied through 23R, and the DC component of the dynamic focus voltage is supplied to the split electrode G5B, G5G, G5R via the capacitance between the opposing surfaces of the sixth grid G6. A voltage on which the AC component of the dynamic focus voltage induced by the superposition is superimposed is applied.

As shown by an electrical equivalent circuit in FIG. 4, the voltages EdB applied to the respective divided electrodes G5B, G5G, G5R,
EdG and EdR are the first, second and third resistors 23B and 23, respectively.
G. The resistance value of 23R is RB, RG, RR, respectively, the capacitance between the opposing surfaces of each divided electrode G5B, G5G, G5R and the fourth grid G4 is C45B, C45G, C45R, respectively, and each divided electrode G5B, G5G, G5R. The capacitances between the opposing surfaces of the first and sixth grids G6 are C56B, C56G, C56R,
The frequency of the dynamic focus voltage applied to the grid G6 is represented by f, and the level of the AC component of the dynamic focus voltage induced via the capacitance between the opposing surfaces of the divided electrodes G5B, G5G, G5R and the sixth grid G6. the phase difference, respectively [phi] B, [phi] G, and .phi.R, the circular constant [pi, When C56B = C45B = CB C56G = C45G = CG C56R = C45R = CR ω = 2πf j 2 = -1, represented by the number 1.

[0030]

(Equation 1) Further, the phase differences φB, φG, φR are expressed by Equation 2.

[0031]

(Equation 2) The capacitances C45B, C45G, C45R, C56B,
C56G and C56R can be obtained by adjusting the distance between the divided electrodes G5B, G5G, G5R and the sixth grid G6 of the fourth grid G4 and the fifth grid G5, and the facing area, so that C56B = C45B = CB C56G = C45G = CG C56R = C45R = CR.

For comprehensive consideration, assuming that the individual capacitances are C and the resistance values are R, ωCR = 2πfCR, and ωCR is the frequency f of the dynamic focus voltage.
To change. Therefore, by appropriately setting the capacitance C and the resistance value R, the horizontal deflection frequency fH and the vertical deflection frequency fV
As a result, the fifth voltage Vd applied to the sixth grid G6
The alternating current component guided to the grid G5 can be selected.

That is, the potential difference between the fifth grid G5 and the sixth grid G6 is selected based on the horizontal and vertical deflection frequencies fH and fV, and the multipole lens QL formed between the fifth and sixth grids G5 and G6. Can be changed according to the horizontal and vertical deflection frequencies fH and fV.

That is, assuming that R >> 2πfH C, a parabolic voltage Vd of the dynamic focus voltage applied to the sixth grid G6 can be induced to the fifth grid G5 by a predetermined amount. For example, FIG.
(A), a parabola-like voltage Vd which changes in synchronization with the horizontal deflection of the electron beam shown by the solid line 36 can be induced by 50% as shown by the broken line 37, and the fifth grid G5
Is changed in synchronization with the dynamic focus voltage applied to the sixth grid G6.
The potential difference between the grids G5 and G6 can be increased in synchronization with the horizontal deflection of the electron beam.

Accordingly, the fifth and sixth grids G5, G
The focusing action in the horizontal direction and the diverging action in the vertical direction of the multipole lens QL formed between 6 are increased in synchronization with the horizontal deflection of the electron beam, and at the same time, the focusing action of the final focusing lens EL is weakened, and the horizontal deflection magnetic field is reduced. Can be corrected. In FIG. 5 (a), TH is one of the horizontal deflection.
It is a cycle.

On the other hand, if R << 2πfV C, the parabolic voltage Vd of the dynamic focus voltage applied to the sixth grid G6 can be induced 100% to the fifth grid G5. That is, FIG.
In (b), the dynamic focus voltage applied to the sixth grid G6 indicated by the solid line 38 is applied to the fifth grid G5, and the fifth and sixth grids G5 and G6 are set to the same potential to deflect the electron beam. Can be changed according to

Accordingly, the fifth and sixth grids G5, G
The function of the multipole lens QL formed between the lenses 6 and 6 can be eliminated, and the focusing action of the final focusing lens EL can be weakened to correct the relatively weak astigmatism of the vertical deflection magnetic field. In FIG. 5B, TV is one cycle of vertical deflection.

Therefore, by setting the horizontal deflection frequency fH to 2πfH CR >> 1, the actual color picture tube apparatus overscans a range 4 to 8% wider in the horizontal direction than the display range of the screen. , A phase difference of about 4π / 104 rad is allowed. Thus, the fifth grid G5 3 split, considering for each, by ^{2π · 4π / 104 = π 2} /13, so that should satisfy π ² fH CR >> 13.

Then, the voltage applied to the sixth grid G6 is
Each divided electrode G5B, G5G, G5R of the fifth grid G5 divided into three in the arrangement direction of the electron beams 20B, 20G, 20R.
A phase difference is given to the AC component of the dynamic focus voltage induced to each of the side beams 20B on the right side of the screen where the amount of induction of the AC component of the dynamic focus voltage is insufficient.
On the other hand, for the other side beam 20R on the left side of the screen where the amount of induction of the AC component of the dynamic focus voltage is insufficient, the center beam 20G
By delaying the phase more than that, it is possible to perform correction to compensate for the shortage of the induction amount.

That is, in a circuit to which capacitance is added,
Since the phase acts in the direction of delay, the center beam 20
The center beam 20G and the other side beam 2 are set based on one side beam 20B whose phase is to be advanced from G.
By delaying the phase by a maximum of 4π / 104 rad in the order of 0R, each divided electrode G5B, G5 of the fifth grid G5 is delayed.
The shortage of the AC component of the dynamic focus voltage induced by G and G5R can be compensated to the maximum.

Here, each divided electrode G of the fifth grid G5
Since the capacitances between 5B, G5G, G5R and the sixth grid G6 are each about 2 pF, the horizontal deflection frequency fH
Is set to 15.75 kHz, R ≧ 42 MΩ from π ² fH CR >> 13.

Therefore, the first, second and third resistors 23B, 23G... Connecting the divided electrodes G5B, G5G, G5R of the fifth grid G5 and the sixth grid G6. The resistance values RB, RG, and RR of the 23R are expressed as RB: RG: RR = RB: RB + 42 MΩ: RB + 84
By setting MΩ, the parabolic voltage Vd that changes in synchronization with the deflection of the electron beam of the dynamic focus voltage applied to the sixth grid G6 is set as Vd = (horizontal scanning width) ^2, and the curve shown in FIG. As shown by 40G, when the center beam scans the screen 100% horizontally, the AC component of the dynamic focus voltage induced to the divided electrode G5G of the fifth grid G5 corresponding to the center beam is 250V, and the overscan width So is 104%. Then, as shown by the curves 40B and 40R, the split electrodes G5B and G5R corresponding to the pair of side beams.
The maximum AC component of the dynamic focus voltage induced to the divided electrode G5G can be induced to be 270 V, which is 108% of the AC component of the dynamic focus voltage induced to the divided electrode G5G.

If the vertical deflection frequency fV is set to 2πfV CR << 1, and if a phase difference of about 4π / 104 rad is similarly allowed, then 2πfV CR ≦ 4π / 104, and R ≦ 1 / It is only necessary to satisfy 52fV C.

As described above, since the capacitance between each of the divided electrodes G5B, G5G, G5R of the fifth grid G5 and the sixth grid G6 is about 2 pF, if the vertical deflection frequency fV is 60 Hz. , R ≦ 160 MΩ from R ≦ 1 / 52fV C, and the divided electrodes G5B, G5G, G of the fifth grid G5
5R and the sixth grid G6, the first, second and third resistors 23B, 23G. 23R resistance values RB, RG, R
By setting R to the above value, practically, the problem of the phase difference is eliminated, and the parabolic voltage Vd which changes in synchronization with the deflection of the electron beam of the dynamic focus voltage applied to the sixth grid G6 is substantially reduced. 100% can be guided to each divided electrode G5B, G5G, G5R of the fifth grid G5.

That is, the three-row arrangement in a row passing on the same horizontal plane
During the horizontal deflection of the electron beams 20B, 20G, and 20R, the fifth grid G is set by satisfying the relationship of RB ≧ 1 / 2πfHCBRG ≧ 1 / 2πfHCGRR ≧ 1 / 2πfHCR.
5 is applied to each of the divided electrodes G5B, G5G, G5R to the sixth grid G6 via the capacitances C56B, C56G, C56R between the opposing surfaces of each of the divided electrodes G5B, G5G, G5R and the sixth grid G6. A parabolic voltage Vd of the dynamic focus voltage is induced, and each divided electrode G5 of the fifth grid G5 is induced.
The potential difference between B, G5G, G5R and the sixth grid G6 can be appropriately increased according to the horizontal deflection, so that the potential difference between each of the divided electrodes G5B, G5G, G5R of the fifth grid G5 and the sixth grid G6. Multipole lens QL formed in
In accordance with the horizontal deflection, and at the same time, the sixth grid G
The focusing action of the final focusing lens formed by the sixth and seventh grids G7 can be reduced, and astigmatism based on the horizontal deflection magnetic field can be properly corrected.

On the other hand, during the vertical deflection period, by satisfying the relationship of RB ≦ 1 / 2πfVCBRG ≦ 1 / 2πfVCGRR ≦ 1 / 2πfVCR, the fifth grid G
5, first, second, and third resistors 23B, 23B disposed between each of the divided electrodes G5B, G5G, G5R and the sixth grid G6.
3G. 23R, the parabola-like voltage Vd which changes in synchronization with the deflection of the electron beam of the dynamic focus voltage applied to the sixth grid G6 is almost 100%.
It can be led to each divided electrode G5B, G5G, G5R of the grid G5. Thereby, the formation of the multipole lens QL between each of the divided electrodes G5B, G5G, G5R of the fifth grid G5 and the sixth grid G6 is eliminated, and the final focusing formed by the sixth grid G6 and the seventh grid G7. Astigmatism based on a relatively weak vertical deflection magnetic field can be corrected by weakening only the focusing effect of the lens.

As a result, the sixth grid G6 of the electron gun 21
The stem pin 34 of the stem 33 for sealing the end of the neck 6
By supplying one intermediate voltage through the, the astigmatism based on the deflection magnetic field can be corrected. Also,
Each of the divided electrodes G5B, G5G, G5R of the fifth grid G5 and the sixth
The multipole lens QL formed between the grid G6 and the grid G6 can have a selecting action in accordance with the deflection frequencies fH and fV.
In addition, a highly reliable color picture tube device with excellent withstand voltage can be obtained.

In the above embodiment, a DC voltage is supplied to the sixth grid via the stem pin of the stem for sealing the neck end, and a parabolic voltage is superimposed on the DC voltage. As shown in FIG. 7, the sixth grid G6 and the seventh grid G7 which is the final acceleration electrode.
Are connected via a fourth resistor 42, and this resistor 42
, The anode voltage applied to the seventh grid G7 may be divided by resistance and supplied to the sixth grid G6.

In the above embodiment, the final focusing lens is a BPF (Bi-potential Focus).
The present invention is not limited to the BPF-type electron gun, but the present invention is not limited to the BPF-type electron gun, but may be applied to other symmetrical and asymmetrical lenses, and further to a color picture tube device having an electron gun composed of a compound lens. Applicable.

[0050]

As described above, the color image receiving apparatus provided with the electron gun which emits three electron beams arranged in a line on a plane having at least the first, second, third, and fourth electrodes on the main lens portion. In the tube device, the second electrode is divided into three electrodes arranged in parallel in the arrangement direction of the three electron beams, and the divided electrodes are respectively connected to first, second, and third resistors having different resistance values. Connected to the third electrode via the first electrode, a predetermined DC voltage to the first electrode, an anode voltage to the fourth electrode, and a predetermined DC voltage to the third electrode in synchronization with the deflection of the electron beam by the deflection yoke. When a multi-pole lens in which the strength of the lens changes according to the deflection frequency of the deflection yoke is formed between the second and third electrodes by applying a dynamic voltage on which the voltage to be applied is superimposed, the neck end is sealed. One intermediate power supply via the stem pin of the stem to stop By supplying, it is possible to correct the astigmatism based on the deflection magnetic field. Further, by providing a multipole lens formed between each divided electrode of the second electrode and the electrode of the third grid with a selection action according to the deflection frequency, the resolution is high over the entire screen and the withstand voltage is high. And a highly reliable color picture tube device.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing a configuration of an electron gun of the color picture tube device.

FIG. 3 (a) is a view showing the shape of an electron beam passage hole on a surface of the fifth grid of the electron gun facing the sixth grid of three divided electrodes, and FIG. 3 (b) is a view showing the sixth grid. It is a figure which shows the shape of the electron beam passage hole of the surface facing the 5th grid of a grid.

FIG. 4 is an electrical equivalent circuit diagram showing a configuration of fourth, fifth, and sixth grid portions of the electron gun.

5A is a diagram for explaining voltages applied to fifth and sixth grids in synchronization with horizontal deflection of an electron beam, and FIG. 5B is a diagram for explaining voltages applied in synchronization with vertical deflection. It is a figure for explaining the voltage applied to the 5th and 6th grid.

FIG. 6 is a diagram illustrating a phase difference of a dynamic focus voltage induced by three divided electrodes of a fifth grid.

FIG. 7 is a diagram showing a configuration of an electron gun according to another embodiment of the present invention.

FIG. 8 is a diagram showing a configuration of a conventional color picture tube device.

9A 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 a beam spot on the phosphor screen of the electron beam deflected by the horizontal deflection magnetic field.

FIG. 10 (a) is a view showing a configuration of an improved electron gun of a conventional color picture tube apparatus, and FIG. 10 (b) is an electron beam passing through a surface of a third grid facing a fourth grid. FIG. 10C shows the shape of the hole, and FIG.
FIG. 3 is a diagram illustrating a shape of an electron beam passage hole on a surface facing a grid.

FIG. 11 is a diagram for explaining the operation of the main lens of the conventional improved electron gun.

FIG. 12 is a view showing the shape of a beam spot on a phosphor screen of a pair of side beams in a conventional color picture tube device.

[Explanation of symbols]

3 phosphor screen 9 deflection yoke 20B, 20R pair of side beams 20G center beam 21 electron gun 23B first resistor 23G second resistor 23R third resistor 32 variable resistor Device 42: Resistor G1: First grid G2: Second grid G3: Third grid G4: Fourth grid G5: Fifth grid G5B, G5G, G5R: Electrode G6: Sixth grid G7: Seventh grid GE: Electronics Beam generation unit ML: Main lens unit

Continuation of the front page (72) Inventor Hirofumi Ueno 7-1 Nisshin-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa F-term in Toshiba Electronic Engineering Corporation (reference) 5C041 AA03 AA14 AB07 AC07 AC35 AD02 AD03 AE01

Claims (5)

[Claims] 1. An electron beam generator for emitting three electron beams arranged in a line, comprising a center beam and a pair of side beams passing on the same plane, and an electron beam from the electron beam generator is focused on a phosphor screen. In a color picture tube device provided with an electron gun having a main lens portion composed of a plurality of electrodes and a deflection yoke for deflecting the three electron beams emitted from the electron gun, the main lens portion is at least a first and a second. It has second, third, and fourth electrodes, and among these electrodes, the first, third, and fourth electrodes are composed of electrodes having an integral structure, and the second electrode is arranged in parallel in the arrangement direction of the three electron beams. Divided into three electrodes
The three divided electrodes are connected to the third electrode via first, second, and third resistors having different resistance values, respectively, and a predetermined DC voltage is applied to the first electrode. A dynamic voltage in which an anode voltage is applied to the electrode 4 and a voltage that changes in synchronization with the deflection of the electron beam of the deflection yoke is applied to a predetermined DC voltage to the third electrode is applied.
A color picture tube device characterized in that the color picture tube device is formed between a third electrode and a multipole lens whose strength changes in accordance with the deflection frequency of the deflection yoke. 2. An electron beam generator for emitting three electron beams arranged in a line, comprising a center beam and a pair of side beams passing on the same plane, and focusing the electron beams from the electron beam generator on a phosphor screen. In a color picture tube device provided with an electron gun having a main lens portion composed of a plurality of electrodes and a deflection yoke for deflecting the three electron beams emitted from the electron gun, the main lens portion is at least a first and a second. It has second, third, and fourth electrodes, and among these electrodes, the first, third, and fourth electrodes are composed of electrodes having an integral structure, and the second electrode is arranged in parallel in the arrangement direction of the three electron beams. Divided into three electrodes
The three divided electrodes are connected to the third electrode via first, second, and third resistors having different resistance values, respectively, and the third and fourth electrodes are connected to a fourth resistor. A predetermined DC voltage is applied to the first electrode, an anode voltage is applied to the fourth electrode, and a DC voltage obtained by dividing the anode voltage by the fourth resistor to the third electrode. A dynamic voltage in which a voltage that changes in synchronization with the deflection of the electron beam of the deflection yoke is superimposed on the voltage is applied,
A color picture tube device characterized in that the color picture tube device is formed between a third electrode and a multipole lens whose strength changes in accordance with the deflection frequency of the deflection yoke. 3. The divided three electrodes of the first electrode and the second electrode.
Of the second electrode based on the capacitance between the first and second electrodes and the resistance of the first, second, and third resistors.
3. The color picture tube device according to claim 1, wherein different dynamic voltage AC components are applied to the electrodes. 4. The resistance values of first and third resistors connected to electrodes on both sides in the arrangement direction of three electron beams among the three divided electrodes of the second electrode are RB, RR, and the center value. The resistance value of the second resistor connected to the second electrode is denoted by RG. Of the three divided electrodes of the second electrode, between the third electrode and the electrodes on both sides in the arrangement direction of three electron beams. The capacitance of CB,
CR, the capacitance between the center electrode and the third electrode is CG, the horizontal deflection frequency of the electron beam is fH, the vertical deflection frequency is fV, and the pi is π. RB ≧ 1 / 2πfH 4. The color picture tube apparatus according to claim 3, wherein CB RG ≥1 / 2πfH CG RR ≥1 / 2πfH CR and RB ≤1 / 2πfV CBRG ≤1 / 2πfV CGRR ≤1 / 2πfVCR. 5. The color picture tube device according to claim 1, wherein the third electrode is connected to an extra-tube resistor.