JP2957679B2 - Color picture tube equipment - Google Patents

Description

The present invention relates to a color picture tube device, and more particularly to a dynamic focus of a high-resolution color picture tube device.

(Prior Art) FIG. 11 shows a horizontal cross section of a general color picture tube device.

In FIG. 1, a color picture tube device 1 includes a face plate 3 having a screen surface 2, a neck 5 connected to a side wall 3a of the face plate 3 via a funnel 4, and an electronic device mounted on the neck 5. A gun 6, a deflecting device 7 mounted on the outer wall from the funnel 4 to the neck 5, a shadow mask 9 having a number of apertures 8 opposed to the screen surface 2 at a predetermined interval,
An internal conductive film 10 uniformly applied from the inner wall of the funnel 4 to a part of the neck 5, an external conductive film 11 applied to the outside of the funnel 4, and an anode terminal provided on a part of the funnel 4 ( (Not shown)).

The red light-emitting phosphor on the screen surface 2, the green-emitting phosphor and a blue phosphor are numerous applied in stripes or point-like, three electron beams B _R emitted from the electron gun 6, B _G and B _B is the impact of each of the phosphors are selected by the shadow mask 9 to emit this.

The electron gun 6 the three electron beams B _R parallel in-line array generates a B _G and B _B, and the electron beam forming unit GE for accelerating and controlling, focusing these electron beams, for concentrating Of the main electron lens portion ML.
Then, a raster is formed by deflecting and scanning the three electron beams BR, BG and BB over the entire screen by the deflecting device 7.

The deflection device basically has a horizontal deflection coil for generating a horizontal deflection magnetic field for deflecting the electron beam in the horizontal direction and a vertical deflection coil for generating a vertical deflection magnetic field for deflecting the electron beam in the vertical direction. ing. In an actual color picture tube device, when the electron beam is deflected, the concentration of the three electron beam spots on the face plate is lost. Therefore, measures are taken to prevent this concentration loss. This is called a convergence-free system. The horizontal deflection magnetic field has a pincushion type and the vertical deflection magnetic field has a barrel type.
The electron beam is focused.

Even if the magnetic field is almost uniform, the electron beam undergoes significant deflection aberration around the screen as shown in FIG. 12 (a) due to a slight pincushion magnetic field component and a barrel magnetic field component. As a result, as shown in FIG. 12 (b), the beam spot has a horizontally elongated high-luminance core portion and low-luminance halos above and below it. This has a greater effect on larger tubes or wider angle deflections.

This is particularly because the electron beam becomes severely over-focused in the vertical direction.

Conventionally, as a means for solving such a deflection aberration, TV technology '88 /VOL.36 P41-55, IEICE Technical Report VOL.86 NO.367
A method has been proposed in which a quadrupole lens is used in P5 to P12 and the like to strongly diverge in the vertical direction according to the amount of deflection. However, such a method increases the electron beam diameter in the vertical direction on the deflection surface. , Are increasingly strongly deflected.

For this reason, in order to obtain a desired convergence state, the electron lens must be largely changed, so that the voltage difference between the dynamic focus voltages becomes large and the circuit load is increased.

In addition, since the quadrupole lens diverges strongly in the vertical direction and at the same time focuses strongly in the horizontal direction, it is necessary to cancel this horizontal over-focusing, so that the structure becomes complicated and it is difficult to use. is there.

Further, Japanese Patent Application Laid-Open No. 60-25140 discloses that, in order to realize a high resolution in a small beam current range while adopting the twice-crossing method, a G electrode is provided between a triode and a main lens generating electrode. _A G _2S electrode is provided, which is lower than the _two- electrode potential and is given a potential that varies according to the amount of deflection, and most of the electrons emitted from the cathode and heading for the main lens intersect the gun axis twice, while the main lens A technique is disclosed in which an outer peripheral portion of an electron beam toward a phosphor screen surface is cut off by a trimming electrode.

However, such a technique will certainly improve the resolution in a small beam current range, but cannot improve the distortion of the electron beam spot due to the deflection aberration as described above. This is because most of the electrons emitted from the cathode and traveling to Maines cross the gun axis twice, so that there is no effect of correcting the anisotropic distortion received from the deflection magnetic field. Further, since an electron lens for forming a second crossover by inserting an auxiliary electrode in the electron beam forming portion from the cathode to the third grid is arranged, for example, the second crossover point is dynamically changed. Even
Since the second crossover point fluctuates similarly in the horizontal section and the vertical section, a color picture tube apparatus having a self-concentrating deflection magnetic field cannot correct the deflection aberration, but on the contrary, the aberration is promoted in one direction. The beam spot becomes severely distorted.

In addition, an electron lens for forming a second crossover is disposed in the electron beam forming unit. However, since the electron beam forming unit has thin plate-shaped electrodes disposed at very short intervals. The shapes of the front and rear beam passage holes and the electrodes easily penetrate the front and rear electrode potentials, which severely affects the electron lens.

For this reason, it is extremely difficult to form a lens having a strong focusing power only in the vertical cross section. For example, a quadrupole lens having a strong diverging power in the horizontal cross section instead of having a strong focusing power in the vertical cross section exhibits the features of the present invention. It is not possible.

(Problems to be Solved by the Invention) As described above, there is a problem that the image quality of the color picture tube apparatus deteriorates due to the distortion of the beam spot due to the deflection aberration as the tube becomes large or wide angle.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art, and has as its object to provide a color picture tube apparatus capable of easily improving the distortion of a beam spot due to deflection aberration, thereby providing a good image over the entire screen. And

[Configuration of the Invention] (Means for Solving the Problems) The present invention includes an electron gun unit, a deflecting unit, and a screen unit, and deflects three in-line arranged electron beams emitted from the electron gun unit. A color picture tube apparatus for deflecting and scanning in a vertical direction and a horizontal direction by the electron gun unit, wherein the electron gun unit generates, accelerates, and controls three in-line arranged parallel electron beams, and an electron beam forming unit including a cathode.
A main electron lens unit including first to fourth lenses for focusing and concentrating the electron beam, wherein the main electron lens unit includes at least a first lens formed from first to third grids; From a second lens formed from the third to fifth grids, a third lens formed from the fifth to seventh grids, and a fourth lens formed from the seventh and eighth grids Become
The fourth grid side of the third grid and the fourth grid, the fifth grid, the sixth grid, and the sixth grid side of the seventh grid have one common beam passage hole that is long in the horizontal direction,
The eighth grid side of the seventh grid is a hollow cylindrical electrode, and the eighth grid is a hollow cylindrical electrode having a larger diameter including the cylindrical electrode. Inside the cylindrical electrode of the seventh grid, The plate-like electrode having three independent beam passage holes and the three beam passage holes, the beam passage holes on both sides have a pair of protrusions in the vertical direction toward the screen side, respectively. A relatively medium voltage for the grid, third, fifth and seventh grids, a relatively low voltage for the second and fourth grids,
A relatively high voltage is applied to the eighth grid, a relatively medium-high voltage between the seventh grid and the eighth grid is applied to the sixth grid, and the vertical and vertical voltages are applied by the first lens. Focus the beam horizontally,
The second lens focuses mainly only in the vertical direction, forms a linear crossing portion in the horizontal direction between the second lens and the third lens, and focuses mainly in the vertical direction only by the third lens. A color picture tube apparatus characterized in that the center beam is focused more strongly than the side beam, the beam is focused in the vertical and horizontal directions by the fourth lens, and the three electron beams are concentrated near the screen. is there.

(Operation) In the present invention, three parallel beams are formed in the electron beam forming unit, and the first lens,
With the second lens, the third lens, and the fourth lens,
The beam is focused and focused on a predetermined screen.

The fourth lens includes a large-aperture lens that works in common for the three beams, so that the distance between the three beams is small, and the high performance exhibits the lens performance, so that the convergence quality is good over the entire screen. In addition, the beam spot diameter becomes smaller, realizing high resolution.

At this time, the first lens, the second lens, and the third lens are provided to adjust the convergence state of the three beams.

Further, by changing the linear intersection formed by the second lens in accordance with the amount of deflection of the deflecting portion, deflection aberration when easily deflected to the peripheral portion of the screen is reduced, and the beam spot is formed on the entire screen. Can be reduced.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a cross section along the XZ plane near the neck portion and a part of the center of the screen of the color picture tube apparatus embodying the present invention, and FIG. 2 shows a cross section along the YZ plane.

In FIGS. 1 and 2, the electron gun section (100) disposed in the neck (5) includes a cathode (K) and a control grid (G ₁ ) of the beam forming section, a screen grid (G ₂ ), 1st grid (GD1), 2nd grid (GD2), 3rd grid (GD3), 4th grid (GD
4), 5th grid (GD5), 6th grid (GD6), 7th grid (GD7), 8th grid (GD8), insulating support (MFG) and valve spacer (BS) that support them
The electron gun (100) has a stem pin (S
TP).

The cathode K is generated inside the three electron beams has a heater H respectively B _R, B _G, and B _B.

The control grid (G ₁ ) and the screen bleed (G ₂ ) of the beam forming unit have three relatively small beam passage holes corresponding to the three cathodes, and the screen grid (G ₂ ) of the first grid GD 1. The side has three beam passage holes larger than the screen grid (G2), and the part from the cathode K to the first grid GD1 controls and accelerates the electron beam from the cathode K, so-called electron beam forming part (GE) Becomes

Next, the second grid (GD2), the second grid (GD2), and the third grid (GD2) of the first grid (GD1) of the main lens unit (ML).
The second grid (GD2) side of the grid (GD3) has three relatively large beam passage holes (121) corresponding to the three cathodes K as shown in FIG. Also, the second grid (GD2) has a vertically parallel projection (PJ) on the third grid (GD3 side) as shown in FIG.

Next, the fourth grid (GD4) side of the third grid (GD3) and the sixth grid (GD6) of the fourth grid (GD4), the fifth grid (GD5), the sixth grid (GD6), and the seventh grid (GD7) The side has one beam passage hole (122) which is elongated in the horizontal direction (X direction) as shown in FIG. 6 (a), and from the opening to the inside of the electrode so as to vertically sandwich three electron beams. It has a protruding piece (IPT) facing it.

The projecting pieces are the fifth grid (GD5) and the sixth grid (G
D6), on each opposing surface side of the seventh grid (GD7), as shown in FIG. 6 (b), the portion where the beams on both sides pass is shorter than the portion where the central beam passes (MPT).

Furthermore, the eighth grid (GD8) of the seventh grid (GD7)
The side is a large cylinder (LCY7), inside which three independent beam passage holes (123), (1)
24) and (124), a plate-like electrode (ECD), and the beam-passing holes (124) on both sides of the three beam-passing holes of the plate-like electrode (ECD) are on the eighth grid (GD8) side. Has a pair of protrusions (VIS) above and below, respectively.

The beam passing holes (124) on both sides of the three beam passing holes are larger than the central beam passing hole (123).

The eighth grid (GD8) is a large cylindrical electrode (LCY8) surrounding the seventh grid (GD7), and the GD7 cylinder (LCY8)
7) to form a substantially large-diameter electron lens (LEL).

The outer periphery of the tip of GD8 has a valve spacer (BS), which is in contact with the conductive film (10) applied from the inner wall of the funnel (4) to the inner wall of the neck (5), and the anode provided on the funnel (4). It is configured to supply an anode high voltage from a terminal.

Above, from the cathode K and G ₁ to GD8 insulating supports (MFG)
Fixedly supported by Further, the neck (5) and a deflection yoke (7) is mounted over the funnel (4) from three electron beams B _R from the electron gun, B _G, B _B
Is composed of a horizontal deflection coil and a vertical deflection coil for horizontally and vertically deflecting the light.

In the electron gun, a predetermined voltage is externally applied to all electrodes except for an eighth grid (GD8) through a stem pin (STP). Of course, a high voltage may be divided and applied using a resistor.

In the above electrode configuration, for example, the cathode K is about 15
A cut-off voltage of 0V, the video signal added thereto, G ₁ is grounded, G ₂ is 500V~1KV, GD1, GD3, GD5, GD7 is 5 to 10 kV, G
D2 applies 0 to 1 KV, GD4 applies 0 to 3 KV, GD6 applies 15 to 20 KV, and GD8 applies an anode high voltage of 25 to 35 KV.

By applying such a potential, an electron lens is formed as shown in FIG.

3 (a) shows an electrode position, FIG. 3 (b) shows a horizontal section (XZ section), FIG. 3 (c) shows a vertical section (YZ section) with respect to the center beam, and FIG. 4 shows the state of the electron lens on the vertical plane with respect to the beam on both sides.

The beam generated from each cathode (K) according to the modulation signal crosses the central axes (Z _R ), (Z _G ), and (Z _B ) by the cathodes (K), (G ₁ ), and (G ₂ ). First crossover
CO ₁ is formed, and is slightly converged by the prefocus lens (PL) by (G ₂ ) and (GD 1), and enters while diverging into (GD 1).

Each electron beam (B _R ), (B
_G ) and (B _B ) are focused on the main electron lens portion (ML) from (GD1) to (GD8) and the beams (B _G ),
(B _B ) is focused on the screen (2) by the concentration action
concentrate.

The three electron beams are deflected and scanned in a horizontal direction and a vertical direction by a deflection yoke (7), and a predetermined image is projected on a screen (2). At this time, the peripheral portion of the screen receives deflection aberration due to the magnetic field of the deflection yoke (7).
At the periphery of the screen, the state of the main electron lens is changed to offset the deflection aberration.

The lens action of the main electron lens from (GD1) to (GD8) will be described in more detail with reference to FIG.

The individual electron beams that form the _first crossover CO ₁ and enter the (GD 1) are individually weak uni-potential lenses (L 1) formed by independent beam passage holes GD 1 -GD 2 -GD 3 respectively. The first lens slightly focuses both in the horizontal and vertical directions. At this time, the first lens is focused slightly stronger in the vertical direction than in the horizontal direction because of the upper and lower protrusions (PJ) on the (GD3) side of (GD2). This is to reduce the beam spot diameter in a high current region.

Next, for the three beams formed by the common horizontally elongated beam passage holes GD3-GD4-GD5, the individual beams are strongly focused only in the vertical direction (Y direction) by the common planar unipotential L2 (second lens). Is done. For this reason (GD
In the middle part of the grid of 5), each beam crosses the horizontal plane (XZ plane) in the vertical direction to form a linear second crossover CO ₂ , and then proceeds while diverging.

Next, each beam is vertically (Y direction) by a planar unipotential lens L3 (third lens) formed by a common horizontally long beam passage hole of GD5-GD6-GD7.
Only a small amount of light is focused, and finally the light is incident on the large-diameter electron lens (L4) (fourth lens) formed by GD7-GD8. At this time, since the facing surfaces (GD5), (GD6) and (GD7) are electrodes as shown in FIG. 6 (b), the center beam is focused slightly stronger than the two-sided beams. The method of focusing the center beam more strongly than the beams on both sides in this way is also possible using electrodes other than the electrodes shown in FIG. 6 (b).

Therefore, the virtual object point position viewed from the fourth lens (L4) is located at the position of OHC in the horizontal direction of the central beam, OHS in the horizontal direction of the beam on both sides of the OVC in the vertical direction, OVS in the vertical direction, and the same in the horizontal direction. But the vertical direction is different.

The “position of the virtual object point viewed from the fourth lens (L4)” here is estimated from the strength of the fourth lens when focusing a symmetric electron beam on the screen, that is, the magnitude of the electrode potential. is there. Therefore, for example, even if there is a difference between the electrode potential of the GD7 for focusing the horizontal direction of the center beam and the electrode potential of the GD7 for focusing the horizontal direction of the two-sided beam, the two states focused on the screen are different. If the beam is small within a practically acceptable range, the strength of the fourth lens for converging the horizontal direction of the center beam and the side beams can be considered to be equivalent.

Accordingly, as shown in FIG. 3 (b), the virtual object point position OHC and the virtual object point positions OHS of both beams as viewed from the fourth lens in the horizontal direction of the center beam are in the same Z-direction position. Differences in practically acceptable ranges are, of course, inclusive. (Even in the specification example to be described later of the main command, there is a difference of about 100 V between the electrode potential of GD7 for focusing the horizontal direction of the center beam and that of the beam on both sides. The degree of the difference is acceptable.) When such a beam enters the fourth lens (L4), the beam is focused in both the horizontal and vertical directions, and the beams on both sides are concentrated and act on the screen. A small beam spot is formed at the center. In the third lens (L3), a unipotential lens in which the potential of (GD6) is higher than the potentials of (GD5) and (GD7) is preferable from the viewpoint of lens aberration.

The fourth lens (L4), the large aperture electron lens, is (GD
7) and (GD8), but (G7)
D8) Plate-shaped electrode (ECD) having three independent beam passage holes (123), (124), and (124) arranged near the side and a projection (VIS) are shown in FIGS. 9 and 10. Since the penetration of high voltage from the (GD8) side is controlled as shown in the figure, the tip GD7T of the (GD7) (a large aperture common to the three beams) and the cylinder of the (GD8) (a large aperture common to the three beams) As a result, one large electron lens (LEL) is formed, and three individual astigmatic lenses (AL ₁ ), (AL ₂ ), and (AL ₃ ) are formed on the low voltage side in this lens area. It will be. 9 and 10 correspond to FIGS. 1 and 2 (GD
7) This is the equipotential state of the-(GD8) section.

At this time, the astigmatic lenses (AL ₁ ) and (AL ₃ ) on both sides
The apertures (123), (124), and (124) of the plate-shaped electrode (ECD) are so weak that they are weaker than the central astig lens (AL ₂ ).
As shown in FIG. 7, the openings on both sides are larger than those in the center. This cancels out the difference between the focusing power of the electron lens (LEL) for the beams on both sides and the focusing power for the center beam. Also, the center of the aperture on both sides of the plate-shaped electrode (ECD) is different from the incident position of the beam and is shifted away from the center. For this reason, in the horizontal direction (XZ plane), the beams on both sides of the astig lenses AL ₁ and AL ₃ respectively pass through the direction closer to the central axis (Z axis) and generate coma aberration. Since the direction is just opposite to the coma caused by the lens (LEL), they are canceled and focused on the screen. Coma is negligible for the electron beams on both sides, and the electron beams on both sides also form good spots. Here, as a whole of the fourth lens (L4), the focusing power in the horizontal direction coincides with the center beam and the beams on both sides depending on the position of the plate-shaped electrode (ECD), the shape of the aperture, and the design of the protrusion, and the vertical The focusing force in the direction is stronger for the two beams than for the center beam. The focus in the horizontal direction is stronger than in the vertical direction. For this reason, the virtual object point position of the beam incident on the fourth lens (L4) is such that the horizontal direction OHC and OHS of the central beam and the bilateral beams are at the same Z direction position, and the vertical direction of the central beam (OVC) is on both sides The beam (OVS) is located farther from the fourth lens (L4) than the beam (OVS), and the horizontal direction (OHC) is closer to the fourth lens (L4) than the vertical direction (OVC).

Depending on the position of the plate-shaped electrode (ECD), the shape of the opening, and the design of the projection, the focusing power in the horizontal direction and the vertical direction may be equal or conversely, the focusing power in the vertical direction may be stronger than the focusing power in the horizontal direction. It is easily possible.

For example, the diameter in the vertical direction (Y direction) of the beam passing hole (123) at the center of the plate electrode (ECD) shown in FIG.
As shown in the drawing, if the protrusion (VIS) is made to protrude longer, the focusing force in the vertical direction of the fourth lens (L4) can be made stronger than the focusing force in the horizontal direction. The situation at this time is shown in FIG.
13 (a), (b), (c) and (d).
(B), (c) and (d) show. The same numbers and names indicate the same things. As shown in FIG. 13, the virtual object point positions viewed from the fourth lens (L4) are the center beam _BG and the side beams B _R and B _B
In the horizontal direction, OHC and OHS are the same (practically the same focusing voltage), but in the vertical direction, the center beam (OVC) is slightly away from the fourth lens (L4) than the bilateral beams (OVS). And the vertical direction (OVC) needs to be closer to the fourth lens (L4) than the horizontal direction (OHC). For this purpose, the focusing state of the beam incident on the fourth lens (L4) may be slightly adjusted by the first lens (L1) to the third lens (L3).

As a result, the central beam and the beams on both sides are simultaneously focused on the same screen in both the horizontal and vertical directions. (Of course, focusing in the horizontal and vertical directions means focusing in the other directions at the same time.) At this time, the electron lens (LEL), astig lens (AL ₁ ),
(AL ₃ ) causes the beams on both sides to bend towards the center beam and to be concentrated on the screen.

This has been clarified by a three-dimensional electrolytic analysis by a computer and an experiment by the present inventors.

As described above, the first lens (L1) suppresses the divergence angle of the beam incident from the electron beam forming unit from becoming too large when the amount of the electron beam increases (at a high current). Focusing is made stronger in the vertical direction than in the horizontal direction. This is because, in the vertical direction, the second lens (L2) and the third lens (L3) use more lenses than the horizontal direction, so these aberrations are added and the spot diameter on the screen is reduced from the horizontal direction. This is because the spot diameter on the screen can be converged to be substantially round by focusing more in the vertical direction than in the horizontal direction.
The method of focusing more strongly in the vertical direction than in the horizontal direction can be performed by, for example, making the beam aperture diameter elliptical or by using a beam forming unit, instead of providing the protruding portion as shown in FIG.

The first lens (L1) is important because it can shorten the overall length of the electron gun, adjust the magnification and aberration of all the electron lenses, and adjust the electrode potential.

When the beam is deflected by the deflection yoke, the beam becomes violently over-focused in the vertical direction as described above. At this time, when the potential of GD4 is increased (dynamic focus), the beam is formed between GD3-GD4-GD5. The focusing power in the vertical direction is weakened mainly by the second lens (L2), and the second crossover CO2 on the horizontal plane moves toward the screen and comes to the position of CO2 (d). Therefore, the position of the object point in the vertical direction as viewed from the fourth lens (L4) is shortened, and the beam focused on the screen goes in the under-focusing direction, so that the over-focusing state by the deflection yoke is canceled out and deflected. At the screen position, the beam is properly focused.

As shown in FIG. 3, according to the present invention, when dynamic focus is performed in the peripheral portion of the screen, the beam diameter at the deflection center plane decreases from D to Dd, so that deflection aberration is less likely to be received, and the dynamic focus sensitivity is extremely high. high.

The detailed specifications of the above embodiment are as follows, for example.

Cathode Sg = 4.92 mm pore size G ₁ phi of each _{electrode, G 2 φ = 0.62mm GD1,} GD2, GD3φ = 4.52mm GD3, GD4, GD5, GD6, GD7 the longitudinal diameter / lateral diameter = 4.52 / 15.0 mm (both sides Large diameter vertical / horizontal diameter = 8.0 / 2.5) Vertical diameter / horizontal diameter of GD7 plate electrode center 11.0 / 4.52mm Both sides 11.0 / 7.0mm GD7φ = 25.0mm GD8φ = 28.0mm Length of each electrode GD1 = 2.5mm, GD2 = 2.0mm, GD3 = 9.2mm GD4 = 8.8mm, GD5 = 17.0mm, GD6 = 4.4mm GD7 = 37.0mm, GD8 = 40.0mm, where a 32 inch screen 110 ゜In a deflection color picture tube device, the electrode potentials for focusing the beam spot at the center of the screen are GD1, GD3, GD5, GD7 9KV GD2 0KV, GD4 2KV, GD6 20KV, GD8 32KV. The three electron beams are concentrated at one point, and the spot diameter is extremely small, about half to 1/3 of that of the in-line type electron gun having a beam interval of 4 to 6 mm according to the prior art.

When such a beam is deflected over the entire screen by the deflection yoke (7), when a voltage as shown in FIG. The deflection aberration due to the yoke disappears, and the spot diameter becomes good over the entire screen,
A color picture tube device having excellent resolution can be provided.

Further, the dynamic voltage as shown in FIG. 8 is smaller than the dynamic voltage of the conventional system, so that the load on the driving circuit of the color picture tube device is reduced, and a very economical effect is exhibited.

In the present invention, at least the first
Lens (L1), second lens (L2), third lens (L3), and fourth lens (L4), and (L2), (L3)
Is a lens that focuses mainly only in the vertical direction (L4) is 3
It includes a large-diameter lens that works in common with the book beam.

In the above embodiment, a few examples of the fourth lens (L4) are shown. However, in the present invention, a large-aperture electron lens that works in common for three beams is disclosed in Japanese Patent Laid-Open No. 1-27933.
9, JP-A-1-154439.

Even if additional elements are added, the present invention is applied as long as the basic configuration of the present invention is not changed.

For example, from the cathode K to the first grid (GD
Until 1), an asymmetric electron lens is used, or an auxiliary electrode is provided in addition to the control grid (G ₁ ) and the screen grid (G ₂ ).

In the above embodiment, (GD8) and (GD7) are implanted on the same insulating support. However, the present invention is not limited to this, and it goes without saying that the shape and support of the electrodes may be different.

[Effects of the Invention] As described above, according to the color picture tube device of the present invention, the performance of the common large-aperture system electronic lens can be sufficiently exhibited,
The common large aperture electron lens can focus three parallel electron beams generated from the cathode on the screen surface in the optimum focusing state and the optimum focusing state, respectively.

Therefore, a very small beam spot can be realized on the screen surface, and a color picture tube value with improved image performance can be obtained.

Further, in a color picture tube apparatus which deflects and scans three electron beams arranged in-line in the horizontal and vertical directions by a deflection yoke, beam spot deflection aberration due to the deflection magnetic field of the deflection yoke can be corrected very easily, and the entire screen can be corrected. A good image can be provided. In particular, in the present invention, the dynamic voltage for correcting the deflection aberration can be very small, so that the drive circuit can be economically designed. Similarly, the low electrode voltage for applying the dynamic voltage is also economical for the drive circuit. There is an advantage of increasing the performance. Further, in the present invention, since the electron lens for correcting the deflection aberration is not a strong quadrupole lens as in the related art, it is necessary to correct a strong focusing in the horizontal direction instead of strongly diverging in the vertical direction. Also, there is an advantage that the design of the electronic lens is easy, and the electronic lens is easy to use.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are an XZ section and a YZ section, respectively, of a main part of a color picture tube apparatus according to an embodiment of the present invention.
3 (a) is an electrode configuration diagram of the color picture tube device of the present invention, FIG. 3 (b) is an equivalent optical model in the XZ direction of FIG. 3 (a), and FIG. 3 (c) is FIG. FIG. 3 (a) is an equivalent optical model in the YZ direction for the center beam, FIG. 3 (d) is an equivalent optical model in the YZ direction for the side beam in FIG. 3 (a), FIG. 4, FIG. 6 (a), 6 (b) and 7 are schematic diagrams of the electrodes used in the present invention, FIG. 8 is a diagram showing the relationship between the position of the screen and the dynamic voltage, FIGS. 9 and 10
The figures are the equipotential distribution diagrams of the main lens portion in the XZ direction and the YZ direction, respectively. FIG. 11 is a schematic sectional view of a general color picture tube, and FIGS. 12 (a) and 12 (b). Are schematic diagrams showing deflection aberration and a beam spot shape, respectively.
13 (a) to 13 (b) are equivalent optical models corresponding to FIGS. 3 (a) to 3 (d), respectively, and FIG. 14 is a schematic diagram of an electrode showing a modification of FIG. It is.

Continuing from the front page (72) Inventor Jiro Shimokawabe 1-9-2 Hara-cho, Fukaya-shi, Saitama Prefecture Inside the Toshiba Fukaya Braun Tube Factory (56) References JP-A-64-31333 (JP, A) JP-A-Heisei 2 -192646 (JP, A) JP-A-62-69441 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01J 29/46-29/68

Claims (1)

(57) [Claims] 1. A color picture tube comprising an electron gun section, a deflecting section and a screen section, and deflects and scans three electron beams emitted from the electron gun section in the vertical and horizontal directions by the deflecting section. An electron beam forming unit including a cathode for generating, accelerating and controlling three parallel electron beams arranged in-line, and first to fourth focusing and concentrating the electron beams. A main electron lens portion including a first lens formed of at least a first to third grids and a second lens formed of a third to fifth grids. A lens, a third lens formed from the fifth to seventh grids, and a fourth lens formed from the seventh and eighth grids.
, The fourth grid side of the third grid and the fourth, fifth, sixth, and seventh grids.
The sixth grid side of the grid has one common beam passage hole that is long in the horizontal direction, the eighth grid side of the seventh grid is a hollow cylindrical electrode, and the eighth grid includes the cylindrical electrode. A hollow cylindrical electrode having a larger diameter, a plate-like electrode having three independent beam passage holes inside the cylindrical electrode of the seventh grid, and of the three beam passage holes,
Each of the beam passage holes on both sides has a pair of protrusions in the vertical direction toward the screen side, respectively, a first grid, a third grid, a fifth grid, and a seventh grid.
The grid has a relatively medium voltage, the second and fourth grids have a relatively low voltage, the eighth grid has a relatively high voltage, and the sixth grid has a seventh grid. And a relatively middle and high voltage between the grids and the eighth grid, respectively, focusing the beam in the vertical and horizontal directions by the first lens, and focusing mainly in the vertical direction only by the second lens. Forming a linear cross in the horizontal direction between the second lens and the third lens, focusing the vertical beam mainly by the third lens, and focusing the center beam more strongly than the side beam; Focus the beam vertically and horizontally by a fourth lens and 3
A color picture tube apparatus, wherein electron beams are concentrated near a screen.