CN1037234A - color picture tube device - Google Patents

Abstract

A color picture tube device is provided with an in-line electron gun unit, a deflection unit, and a fluorescent screen unit. The electron gun unit includes an electron beam forming unit that generates, controls, and accelerates three parallel electron beams, and a main unit that focuses and concentrates the three electron beams. Electronic Lens Department. The main electron lens part has a large-aperture asymmetric electron lens that works together on the three electron beams, and gives each electron beam a divergence effect that is stronger in the vertical direction than in the horizontal direction, and makes the three electron beams incident on the non-symmetrical electron beams in a parallel state. Electron beam forming means of symmetrical electron lens. The electron beam forming means is provided on the side of the electron beam forming part of the asymmetric electron lens.

Description

The present invention relates to a color picture tube device, and more particularly to a color picture tube device having an electron gun for focusing and concentrating three electron beams arranged in a row through a large-diameter electron lens common to the electron beams.

Fig. 12 is a diagram showing a horizontal cross-section of a general color picture tube device.

In Fig. 12, the color picture tube device 1 is equipped with a panel 3 having a fluorescent screen surface 2, and is connected to a tube neck 5 of the side wall portion 3a of the panel 3 through a funnel portion 4, and an electron gun 6 installed inside the tube neck 5 is connected to the tube neck 5 from the funnel. Part 4 until the deflection device 7 mounted on the outer wall of the tube neck, the shadow mask 9 that is arranged on the opposite side of the above-mentioned fluorescent screen surface 2 and maintains a predetermined interval and has a plurality of holes 8, from the inner wall of the above-mentioned funnel part 4 to the above-mentioned tube neck 5 An inner conductive film 10 uniformly coated on a part of the funnel part 4 and an outer conductive film 11 coated on the outside of the funnel part 4, and an anode terminal (not shown) provided on a part of the funnel part 4 .

And, on the phosphor screen surface 2 coated with a lot of red light-emitting phosphors, green light-emitting phosphors and blue light-emitting phosphors in stripes or dots, the three electron beams B _R , B _G and B _B is selected by the shadow mask 9 and bombards the respective phosphors to emit light.

In addition, the electron gun 6 has an electron beam forming part GE for generating parallel three electron beams B _R , B _G and B _B arranged in a row, accelerating them and controlling them, and for focusing these electron beams. And focus the main electron lens ML. And, a raster is formed by deflecting and scanning the three electron beams _BR , _BG , and _BB over the entire fluorescent screen surface by the deflection means.

The method for concentrating the three electron beams is shown in, for example, US Patent No. 2,957,106. The technique is to tilt and concentrate the electron beams emitted from the cathode from the beginning, and as shown in US Patent No. 3,772,554. The technology is to make the electron beam emitted from the cathode tilted and concentrated from the beginning, and as shown in the US Patent No. 3,772,554 specification, its technology is to pass through the openings of the three electron beams on the electrode of the electron gun. A part, that is, openings on both sides of the electrodes are slightly off-centered outward from the center axis of the electron gun to concentrate the electron beams, any of which has been widely used. The deflection device basically has a horizontal deflection coil for deflecting the electron beams in the horizontal direction and a vertical deflection coil for deflecting the electron beams in the vertical direction. When deflecting the electron beams in an actual color picture tube device, since the concentration of the three electron beam spots on the panel is gradually destroyed, efforts must be made to prevent the destruction of the concentration. This is called a convergence free system, and by making the horizontal deflection magnetic field a pincushion shape and the vertical deflection magnetic field a barrel shape, three electron beams can be concentrated over the entire range of the self-concentrating magnetic field phosphor surface.

As mentioned above, color picture tubes have been improved in quality by adopting various development technologies, but many new problems are arising as the tubes become larger and higher in quality.

That is, the existing problems are: 1. the diameter of the spot of the electron beam on the phosphor screen, 2. the distortion of the electron beam spot on the peripheral part of the phosphor screen during deflection, and 3. the convergence problem on the entire phosphor screen.

If the size of the tube increases, the distance from the electron gun to the phosphor screen becomes longer, the electron optical magnification of the electron lens becomes larger, the spot diameter on the phosphor screen becomes larger, and the resolution deteriorates. To reduce the spot diameter, it is necessary to improve the performance of the electron lens of the electron gun.

Generally, a main electron lens is formed by arranging a plurality of electrodes having openings coaxially and applying a predetermined potential to each. There are several types of such electrostatic lenses due to different electrode structures, but basically they are formed by forming a large-diameter lens with a large electrode opening diameter, or increasing the distance between electrodes and slowing down the change in potential. The long focal length lens can improve the performance of the lens.

However, since the electron gun of a color picture tube is generally enclosed in a tube neck made of a very thin glass cylinder, firstly, the opening of the electrode, that is, the aperture of the lens, is physically restricted. In addition, the distance between the electrodes is limited in order to prevent the focusing electric field formed between the electrodes from being affected by other undesired electric fields in the neck.

In particular, when three electron guns are integrated in a triangular arrangement or in-line arrangement like a shadow mask type color picture tube, there is an advantage that the smaller the electron beam interval (Sg), the easier it is to use The three electron beams are concentrated at one point near the entire fluorescent screen, and the deflection power is small, so in order to narrow the distance between the electron guns, the openings of the electrodes have to be made smaller.

Therefore, the method conceived is to completely overlap the three electronic lenses paralleled on the same plane to form a large electronic lens. Through this large-diameter electronic lens, the performance of the electronic lens can be maximized. FIG. 13 is a diagram optically illustrating this. As shown in the figure, the core of the projected electron beam becomes smaller, but the result is not very satisfactory when viewed from the perspective of the entire electron beam. That is, if the three electron beams B _R , B _G , and B _B with an electron beam interval of Sg pass through a shared large-diameter electron lens LEL, then as shown in Figure 13, when the central electron beam B _G is just focused, The electron beams B _R and B _B on both sides are in an over-focused state, and once they become over-focused, they will be accompanied by relatively large coma aberrations. The distances between the three electron beam spots SPR, SPG, and SPB on the fluorescent screen 101 Widely pulled apart, while the electron beams on both sides are distorted.

In order to partially reduce coma aberration by adjusting the focus states of these three electron beams, if the interval Sg of the three electron beams is reduced to some extent relative to the lens aperture D of the electron lens LEL, then practically There will be no problem, but regarding the concentration state of the three electron beams on the phosphor screen, Sg must be made extremely small, but there is a limit in terms of the mechanical arrangement of the electron beam generating part.

Therefore, in Japanese Patent Publication No. 49-5591 (U.S. Patent No. 3,448,316 specification) and U.S. Patent No. 4,528,476 specification, as shown in FIG. The electron beam has an inclination angle θ, and it is made so that the three electron beams can pass through the central part of the electron lens LEL at the same time to adjust the focusing state of the three electron beams, and then pass through the second lens LEL2 to make the electron beams on both sides of the emission A large deflection (φ°) is made in the opposite direction, so that the three electron beams are concentrated on the phosphor screen. The result is improved focusing and concentration of the three electron beams. But there remains a problem that a large deflection aberration or coma aberration occurs for the electron beams on both sides.

As mentioned above, it is difficult to use a large-diameter electron lens that acts on three electron beams, and the performance of the large-diameter electron lens cannot be maximized.

In this way, in order to further improve the image performance of the color picture tube device, the performance of the electron gun can be improved by using a large-diameter electron lens shared by the three electron beams, and the beam spot diameter on the fluorescent screen can be effectively reduced. In the prior art, the performance of the large-aperture electronic lens cannot be fully utilized, and the existing problem is that it is difficult to further improve the image performance of the color picture tube device. Therefore, in order to further improve the image performance of the color picture tube device, it is expected to obtain a color picture tube equipped with an electron gun that can fully exert the performance of the large-diameter electron lens.

The present invention is made to solve the problem of the prior art, and its object is to provide a large-diameter electron lens that can pass through three electron beams in common, and at the same time, it is easy to focus and concentrate each electron beam, and The color picture tube of the electron gun that can fully exert the performance of this large-diameter electron lens.

That is, the color picture tube device of the present invention is equipped with a column type electron gun part, a deflection part and a fluorescent screen part, and the electron beam emitted from the above-mentioned electron gun is deflected and scanned in the vertical direction and the horizontal direction by the deflection part, It is characterized in that the above-mentioned electron gun part has an electron beam forming part that generates three electron beams, accelerates and controls them, and a main electron lens part that focuses and concentrates the electron beams, and has a pair of three electron beams on the main lens part. A large-aperture asymmetric electron lens with two electron beams acting together. The convergence force in the horizontal direction of the asymmetric electron beams acting on the three electron beams is weaker than the convergence force in the vertical direction. The three electron beams incident on the asymmetric electron lens The axes of the beams are parallel to each other, and each electron beam is an electron beam whose divergence intensity is stronger in the vertical direction than in the horizontal direction.

The electron beams incident on the above-mentioned asymmetric electron lens do not mean that they diverge in the horizontal direction. The following cases are also included, that is, electron beams that are focused in the horizontal direction.

In addition, the present invention is in a color picture tube device equipped with an in-line electron gun part, a deflection part, and a fluorescent screen part, and the electron beam emitted from the above-mentioned electron gun is deflected and scanned vertically and horizontally through the transfer part, and is characterized in that The electron gun part includes an electron beam forming part that generates three electron beams, accelerates and controls them, and a main electron beam lens part that focuses and concentrates the electron beams. A large-aperture asymmetric electron lens with large diameter, the asymmetric electron lens has a cylindrical electron lens shared by three electron beams and a non-circular electron beam that allows three electron beams to pass through the lens area of the cylindrical electron lens The axes of the three electron beams that enter the asymmetric electron lens are parallel to each other, and the electron beams become electron beams whose divergence intensity is stronger in the vertical direction than in the horizontal direction. electron beam forming means.

In the present invention, the beam axes of the electron beams incident on the main electron lens of the electron gun are parallel to each other, and each electron beam is designed to diverge stronger in the vertical direction than in the horizontal direction.

On the other hand, on the main electron lens part, there are three electron beams that act together on the three electron beams. Is it more razor-sharp than wood-based Ρ, but it is more strange than razor-like wood-based θ?

Once the above-mentioned specific electron beam is injected into such a large-diameter asymmetric electron lens part, the incident electron beam is subjected to the lens action of the large-diameter asymmetric electron lens, and the three electron beams projected on the fluorescent screen become well-concentrated. , and the diameter of each electron beam is small without distortion. In addition, since the three electron beams pass through the large-diameter lens, the advantage of being a large-diameter lens can be obtained to the maximum.

In the present invention, when the electron beams incident on the main electron lens do not spread in the horizontal direction, that is, they are roughly parallel, the best concentration and focusing characteristics can be obtained.

In order to compare with the present invention, the electron beams incident on the main electron lens are made approximately parallel in the horizontal direction and the vertical direction, and other conditions are in accordance with the present invention, and the focusing characteristics are poor.

The present invention will be described in detail below with reference to the accompanying drawings.

Fig. 1 shows a cross-sectional view of a part of the phosphor screen part near the tube neck of a color picture tube device according to the present invention, on the X-Z plane, and Fig. 2 shows a cross-sectional view on the Y-Z plane of only the electron gun part.

In Fig. 1, Fig. 2, the electron gun part 100 arranged in the tube neck 5 is composed of a cathode K, a first grid G1, a second grid G2, a third grid G3, a fourth grid G4, and a fifth grid G5. , the sixth grid G6, the seventh grid G7 and the insulating support BG supporting these electrodes and the shell spacer 112, the electron gun 100 is fixed on the stem 113 at the lower part of the tube neck.

The above-mentioned cathodes K each have a filament inside, and generate three electron beams B _R , B _G , and B _B .

The first grid G1 and the second grid G2 have three smaller electron beam passing holes corresponding to the above three cathodes K, and the electron beams emitted from the cathode K are controlled and accelerated in this part to form The so-called electron beam forming section. Next, the third grid G3, the fourth grid G4, and the fifth grid G5 also have three relatively large electron beam passage holes corresponding to the three cathodes K.

On the side of the fifth grid G5 close to the sixth grid, the four electrodes 20, 21, 22, 23 are arranged to sandwich three electron beam passing holes 52R in the direction perpendicular to the in-line arrangement direction (X-Z plane). , 52G, 52B, on the side of the sixth grid G6 close to the fifth grid G5, parallel to the in-line arrangement direction, and two are arranged on the upper and lower parts of the three electron beam passing holes 61R, 61G, 61B The electrodes 24, 25, the four electrodes 20, 21, 22, 23 on the side of the fifth grid G5 and the two electrodes 24, 25 on the side of the sixth grid G6 overlap each other, as in the fifth grid G5 and the sixth grid G5. When a voltage is applied between the grids G6, a quadrupole lens is formed between the four electrode plates of the fifth grid G5 and the two electrode plates of the sixth grid G6.

And the sixth grid G6 is substantially a cylindrical electrode, and on its side close to the fifth grid G5, there are three electron beams with the same size as the electron beam passage holes 52R, 52G, and 52B of the fifth grid G5. The beam passing holes 61R, 61G, 61B are provided, and on the side close to the seventh grid G7, a large circular electron beam passing hole 62 is provided. And in this cylindrical electrode part, an electrode 60 is arranged on the middle part of its length direction, and the electrode has an oblong electron beam passing hole 63, and its shape is the diameter of the in-line arrangement direction (X direction). long.

This electron beam passing hole 63 is located at a place only at a predetermined distance a from the end of the sixth grid G6 near the seventh grid side. For the diameter D6 of the large circular electron beam passing hole 62, a< D6 relationship.

The seventh grid G7 and a part of the sixth grid G6 overlap, and the seventh grid is a substantially cylindrical electrode including the sixth grid G6 of cylindrical electrode type, and the seventh grid and the sixth grid G6 are substantially cylindrical electrodes. The large circular electron beam passing holes 62 of the sixth grid G6 substantially form a large-diameter cylindrical lens.

In the inside of the cylindrical electrode of the seventh grid G7, at a place separated only by a predetermined distance b from the end of the sixth grid toward the phosphor screen portion 2 side, a wire with a diameter short in the in-line arrangement direction (X direction) is provided. The electrode 70 of the oblong electron beam passage hole 73 has a relationship of b<D7 with respect to the cylinder diameter D7 of the seventh grid G7.

Also in this embodiment, a>b is set. Electrodes 60 and 70 are shown in FIG. 1 .

A shell spacer 112 is installed on the outer periphery of the front end of the seventh grid G7, 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 is made to be supplied from the anode terminal arranged on the funnel. anode high voltage. A magnetic field correcting element for correcting the magnetic field generated by the deflection yoke may also be placed on the front end of the seventh grid G7. The above cathode K, and the first grid G1 to the seventh grid G7 are all fixed and supported by an insulating support.

Also, a deflection coil is installed from the neck 5 to the funnel 4, and the deflection coil 7 is composed of a horizontal deflection coil for deflecting the birds _R , B _G and B _B emitted from the electron gun in the horizontal and vertical directions. and vertical deflection coils. Also, a multi-pole magnet 51 for adjusting the trajectory of the electron beams is arranged.

In the above-mentioned electron gun, all electrodes except the seventh grid G7 are externally applied with a predetermined voltage through the stem 113 .

In the composition of the above electrodes, for example, the cathode K is applied with a cut-off voltage of about 150V, and an image signal is applied to it, the first grid G1 is grounded, the second grid G2 is 500V-1KV, and the third grid G2 is at ground potential. Add 5-10KV to the pole G3, add 500-3KV to the fourth grid G4, add 5-10KV to the fifth grid G5, add 5-10KV slightly higher than the fifth grid G5 to the sixth grid G6, and add 5-10KV to the seventh grid Pole G7 plus anode high voltage 25-35KV.

Due to the addition of such a potential, the electron beams generated from each cathode K according to its modulation signal pass through the cathode K, the first grid G1, and the second grid G2, forming the minimum cross section of the intersection area as shown in Figure 3 and Figure 4 CO, and a small amount of focusing is performed by the pre-focus lens PL formed by the second grid G2 and the third grid G3 to form a virtual cross point VCO, and enter the third grid G3 while diverging. The electron beams B _R , B _G , and B _B entering the third grid G3 are focused in the main electron lens portion ML1 formed from the third grid to the seventh grid, and the electron beams on both sides are concentrated. , while focusing and concentrating on the fluorescent screen 2. Fig. 3 and Fig. 4 are equivalent optical models corresponding to Fig. 1 and Fig. 2 respectively.

The lens action of the main electron lens portion formed from the third grid G3 to the seventh grid G7 will be described in detail using the optical models shown in FIGS. 3 and 4 .

Each electron beam that forms the imaginary intersection VCO and enters the third electrode G3 passes through each weak single-potential lens EL2 (second electron lens EL2) formed by the third grid G3, the fourth grid G4, and the fifth grid G5. ) are focused by a small amount respectively.

Also, on the fifth grid G5, as mentioned above, since four electrodes 20, 21, 22, 23 are arranged in the direction perpendicular to the in-line arrangement direction (X-Z plane), and on the sixth grid G6 Two electrodes 24, 25 are arranged in a direction parallel to the direction of the in-line arrangement, so if a voltage is applied between the fifth grid G5 and the sixth grid G6, a quadrupole lens QEL is formed between these electrodes. . Therefore, the electron beam incident here is subjected to the lens effect, and advances toward the large-aperture electron lens LEL, and the divergence in the vertical direction is stronger than that in the horizontal direction. The intensity of the above-mentioned divergent force generated by the quadrupole lens QEL should be added or subtracted according to the oblateness or concentration of the electron beam projected on the fluorescent screen, so the above-mentioned six electrodes 20, 21, 22, 23 should be selected appropriately , 24, 25 of the respective size or relative spacing and so on. In the present invention, it is preferable to form the quadrupole lens QEL so that the electron beams emitted from the quadrupole lens QEL diverge in the vertical direction and become substantially parallel electron beams in the horizontal direction.

If the electron beam passing through such a quadrupole lens QEL is incident on the large-aperture lens LEL, it will be subjected to the lens effect of the large-aperture lens, and the electron beam finally projected on the fluorescent screen has good concentration and focusing characteristics.

This point will be described in detail using FIG. 1 and FIG. 5 .

The large-diameter lens unit LEL has a front-stage lens CL and a rear-stage lens DL, and can be regarded as one large-diameter electronic lens LEL as a whole.

That is, because there is an electron beam passage opening 63 elongated in the horizontal direction inside the cylindrical electrode of the sixth grid G6, the high-voltage electric field penetrating from the seventh grid is distorted through the electron beam passage opening 63. And the focusing lens CL of the front stage which has a weak focusing force action in a horizontal direction (X direction) and a strong focusing force action in a vertical direction (Y direction) is produced. In the other direction, there is a vertically elongated electron beam passage opening 73 inside the cylindrical electrode of the seventh grid G7, so that the low-voltage electric field penetrating from the sixth grid is distorted and generated through the electron beam passage opening 73. The diverging lens DL of the rear stage has a strong diverging force acting on the horizontal direction (X direction) and a weak diverging force acting on the vertical direction (Y direction). Moreover, as a whole, the large-diameter electronic lens LEL has a weak focusing effect in the horizontal direction (X direction) and a strong focusing effect in the vertical direction (Y direction).

That is, a common large-aperture asymmetric lens is formed. Concentration and focusing properties in the embodiments are described here.

The three electron beams incident on the common large-aperture lens LEL have their axes parallel to each other, so they are well focused on the fluorescent screen by the weak focusing force in the horizontal direction of the large-aperture lens LEL.

When the horizontal focusing power of the common large-aperture lens LEL shown in FIG. 13 is strong, this can be compared with the case where the three electron beams are over-concentrated on the fluorescent screen.

The focusing characteristic of the electron beam will now be described.

Although the electron beam passing through the quadrupole lens QEL has little effect during passing through here, it is compressed in the horizontal direction. It is subject to weak focusing in the horizontal direction and strong focusing in the vertical direction, so it becomes a well-focused electron beam on the fluorescent screen.

Each weak single-potential lens EL2 (second electron lens) formed between G3, G4, and G5 shown in this embodiment is used to adjust the diameter of the electron beam incident on the large-aperture electron lens LEL or the entire main lens. Regarding the focusing state of the electronic lens part ML1, in the present invention, an asymmetric lens located outside the lens area of the large-aperture electronic lens can be provided on the lens EL2 part.

In order to simplify the description, if the second electron lens EL2 which is added to the weak focusing effect is not considered, then the electron beams coming out from the imaginary cross point VCO located on the axis are focused on the asymmetric lens QEL part in the horizontal direction to form pairs of electrons. Since the axes of the electron beams are almost parallel, the imaginary intersection point VCOH in the horizontal direction is as far as infinity behind the cathode.

For this reason, the three parallel electron beams arranged in a row are concentrated on the fluorescent screen through the large-diameter electron lens LEL, and each electron beam becomes focused on the fluorescent screen at the same time. As in other words, this means that the focal point on the image point side of the large-aperture electronic lens in the horizontal direction is located on the fluorescent screen. However, in practice, it is necessary to adjust the intensity of the QEL and the intensity of the LEL for the spherical aberration of the lens or the emission of the electron beam emitted from the cathode. On the other hand, since it is diverged (or weakly focused) on the asymmetric lens QEL part in the vertical direction, the imaginary cross point VCOV in the vertical direction is located farther away from the phosphor screen side than VCOH in the horizontal direction, and passes through The large-aperture electron lens LEL is subjected to a strong focusing effect, so that each electron beam is focused on the fluorescent screen.

Therefore, while the three electron beams arranged in a row are concentrated, each electron beam is circularly focused on the fluorescent screen.

The detailed description of the above-mentioned embodiment is given as an example as follows:

Cathode interval Sg=4.92mm

The opening diameter of each electrode G1 φ, G2 φ＝0.62mm

G3 φ, G4 φ, G5 φ, G6 Bφ＝4.52mm.

G6 Tφ＝D6＝25.0mm

G7 φ＝D7＝28.0mm

电极27＝

Electrode 26 =

Electrode 27 =

The length of each electrode G3=6.2mm, G4=2.0mm

G5＝35.4mm G6＝30.0mm

Electrode 20-23=4mm, electrode 24, 25=4mm

Interval of each electrode

G1/G2=0.35mm, G2=G3=1.2mm

G3/G4, G4/G5＝0.6mm

a=11.0mm, b=6.0mm

In the above-mentioned embodiment, because can obtain the lens state that there is strong diverging force in the horizontal direction on the back stage portion of large-aperture electronic lens LEL, so as shown in Figure 6, come out from this large-aperture electronic lens and concentrate The interval SD between the three electron beams on the phosphor screen on the deflection center plane becomes quite small compared with the interval S _O ' when simply concentrating (the dotted line in the figure), so that the three electron beams can be placed on the entire phosphor screen surface Concentration errors during deflection are suppressed to be small or the deflection power can be reduced, so a high-resolution and high-quality color picture tube can be provided.

In the above embodiment, when the deflection yoke becomes a convergent free (convergeuce free) magnetic field, the distortion of the electron beam due to the deflection magnetic field is very serious, so if the voltage of the fifth grid G5 is changed synchronously with the horizontal and vertical deflection, Then also can make the lens power of above-mentioned asymmetrical lens QEL change, to offset above-mentioned deflection distortion, or all also can make deflection magnetic field be homogeneous magnetic field, remove the electron beam distortion caused by deflection magnetic field, and by adjusting image signal and deflection Convergence due to the mutual relationship of currents.

In the above-mentioned embodiment, as the common large-aperture asymmetric lens, the bipotential type cylindrical lens is the basic type, and by disposing the horizontally long electron beam passing hole 48 at the distance of the front part a, the rear part b Then dispose the vertically long electron beam passing hole 50 on the distance, and set a>b, then the divergence effect in the horizontal direction produced by the rear section is strong, but the present invention is not limited to this case, it is also good when a=b , when a<b, a shared large-aperture asymmetric lens can also be formed, and for example, the horizontally long electron beam passage hole in the front section can be removed. Of course, the non-circular electron beam passage hole can also function as a large-aperture asymmetric lens with stronger focusing power in the vertical direction than in the horizontal direction, and appropriate changes can also be given.

Also, it goes without saying that a single potential type lens, an electric field expansion type lens, etc. may be used other than the bipotential type cylindrical lens.

In the above embodiment, in order to make each of the three independent electron beams incident on the shared large-aperture asymmetric lens LEL approximately parallel on the horizontal cross-section, and become a divergent system on the vertical parallel cross-section, so An asymmetric lens QEL is arranged between the fifth grid G5 and the sixth grid G6, but the present invention is not limited to this case, as mentioned above, an asymmetric lens can be made on the fourth grid G4, or An asymmetric lens may also be provided on the electron beam forming part, and the horizontal section of each electron beam may be substantially parallel to the electron beam.

Another embodiment of the present invention is shown below.

Fig. 8 and Fig. 9 are X-Z section and Y-Z section corresponding to Fig. 1 and Fig. 2 respectively, and the same parts are indicated by the same numbers.

In Fig. 8 and Fig. 9, there are two electrode plates 53, 54 above and below the three electron beam passage ports 52R-52B on the front end of the fifth grid G5, and there are two electrode plates 53, 54 near the fifth grid G51 of the 51st grid G51. On the pole side, there are also two electrode plates 511, 512 above and below the three electron beam passage ports 511R-511B, and there are four electrode plates 511, 512 in the vertical direction on the side close to the sixth grid G6 of the 51st grid G51. Electrode plates 513, 514, 515, 516, also have 4 electrode plates 612, 613, 614, 615 on the 6th grid G6 side near the 51st grid and make it clamp three electrons in the vertical direction The beam passes through ports 61R-61G.

The sixth grid G6 and the seventh grid G7 are the same as those of the above-mentioned embodiments, and are based on a large-diameter cylindrical lens, and include non-circular electron beam passage openings 63 and 73 inside.

If the potential is gradually increased in the order of the fifth grid G5, the 51st grid G51, the sixth grid G6, and the seventh grid G7, then between the opposite electrode plates of the fifth grid G5 and the 51st grid G51 Between the parallel plate lens FLV that only has a focusing effect in the vertical direction (without any force in the horizontal direction), between the electrode plates opposite to the 51st grid G51 and the sixth grid G6, a Parallel plate lens FLH with focusing effect on it (without any force in the vertical direction).

At this time, the focus of the lens FLH is stronger than that of the lens FLV. Therefore, the electron beams from the electron beam forming part are strongly focused in the horizontal direction, and become roughly parallel electron beams, which are slightly focused in the vertical direction and still diverge. The electron beams are directly incident on the common large-aperture asymmetric lens part LEL, and the same as the above-mentioned embodiment, the three electron beams are focused and concentrated on the fluorescent screen by the large-aperture lens part.

In this example, the voltage supplied to the fifth grid G5 is externally connected to a dynamic correction circuit 72 so that it can change in a parabolic shape in synchronization with the horizontal and vertical deflection currents H and V flowing into the deflection yoke 7.

Therefore, when the horizontal deflection magnetic field generated by the deflection yoke is a strong pincushion magnetic field, when the electron beam is deflected to the peripheral portion of the fluorescent screen as shown in FIG. This synchronous electron lens FLV becomes weaker in focus and gradually becomes under-focused in the vertical cross-sectional direction, so that the above-mentioned deflection distortion can be corrected to form a circular electron beam.

Other embodiments are described further herein. That is, as shown in FIG. 10, regarding the two electrodes 24, 25 disposed on the sixth grid G6, the distance V _G between the two electrodes on the central electron beam passing hole portion is due to the ratio of the two electrodes on both sides. The distance V _RB between the two electrodes on the part of the electron beam passing hole is small (V _G < V _RB ), so the quadrupole lens QEL (G) formed with respect to the central electron beam becomes larger than that of the electron beams at both sides. The formed quadrupole lens QEL (R) and QEL (B) strong quadrupole lens. For this reason, the central electron beam is more focused on the horizontal direction than the electron beams on both sides, and gradually incident on the large-aperture electron lens LEL.

The electron beam passing through such a quadrupole lens QEL is the same as the above-mentioned embodiment, if it is incident on the large-aperture electron lens, then it is subjected to the lens effect of the large-aperture lens, and the electron beam that is finally reflected on the fluorescent screen shows that there is better concentration and focusing properties.

The present invention intends to improve the performance of the lens by disposing a large-diameter electron lens shared by the three independent electron beams in the main electron lens part, but at this time, in order to satisfy the focusing and concentration of the three electron beams at the same time, the above-mentioned shared large-diameter The aperture electronic lens is an asymmetric lens whose focusing power is weaker in the horizontal direction than in the vertical direction. The three independent electron beams that are incident on the common large-aperture asymmetric electron lens become roughly parallel electron beams in the horizontal direction. In the vertical direction, it becomes a diverging electron beam, and the above-mentioned shared large-aperture asymmetric electron beam lens is, for example, by setting a cylindrical electron lens shared by the independent three electron beams emitted from the electron beam forming part and at the center of the cylindrical electron lens. In the lens area, on at least one side of the cathode side or the fluorescent screen part side, a non-circular electron beam passage hole for three electron beams to pass through is formed, and outside the lens area of this cylindrical electron lens, on the cathode side An asymmetric electron lens independent of the three electron beams is arranged on the top, and by using this electron lens, the horizontal direction is focused more strongly than the vertical direction, and electron beams that are substantially parallel in the horizontal direction are formed.

Also, in other words, in the lens area of the above-mentioned cylindrical electron lens, the horizontal direction of the non-circular electron beam passage holes disposed on the cathode side is substantially longer than the vertical direction, and the non-circular electron beam passage holes disposed on the phosphor screen side The horizontal direction of the electron beam passage hole is substantially shorter than the vertical direction.

Also, outside the above-mentioned cylindrical electron lens area, the three electron lenses arranged on the cathode side constitute an independent asymmetrical electron lens. It is also possible to have a variable intensity of the electron lens according to the amount of deflection caused by the deflection part. s method.

As mentioned above, according to the color picture tube device of the present invention, by fully exerting the performance of the shared large-aperture electron lens, the parallel three electron beams generated from the cathode using this large-aperture electron lens can be respectively in the optimal focus state and Focus on the fluorescent screen in the best concentration state.

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

Fig. 1 is the X-Z sectional view of the main part of implementing the color picture tube device of the present invention,

Fig. 2 is the Y-Z sectional view of the main part of implementing the color picture tube device of the present invention,

Fig. 3 and Fig. 4 are equivalent optical diagrams corresponding to Fig. 1 and Fig. 2,

5 and 6 are diagrams illustrating the large-aperture electron lens of the present invention,

Fig. 7 is a diagram showing electrodes for forming the large-aperture asymmetric lens of the present invention,

Fig. 8, Fig. 9 and Fig. 10 are the sectional view of the main part of another embodiment of the present invention,

Fig. 11 is a diagram showing electron beam shapes of the present invention and conventional examples,

Fig. 12 is a schematic sectional view of a general color picture tube device,

13 and 14 are explanatory diagrams of the prior art.

1...Color picture tube device 100...Electron gun department

7...Deflection device 2...Fluorescent screen

GE...Electron beam forming department

ML1...Main electron lens unit

QEL...asymmetric lens

LEL...shared large-aperture lens

Claims (3)

1. A color picture tube device, equipped with a column type electron gun part 100, a deflection part 7 and a fluorescent screen part 2, so that the electron beams (B _R , B _G , B _B ) emitted from the above-mentioned electron gun parts are vertically and horizontally Deflection scanning and projecting images on the above-mentioned fluorescent screen is characterized in that the above-mentioned electron gun part 100 has an electron beam forming part that generates three parallel electron beams (B _R , B _G , B _B ) and controls and accelerates them. GE, and the main electron lens part ML1 that makes the above-mentioned three electron beams focused and concentrated, this main electron lens part ML1 has a large-aperture asymmetric electron lens LEL that works together on the three electron beams and the vertical direction is stronger than the horizontal direction. The divergence effect is applied to each electron beam, and the three electron beams are incident on the electron beam forming means QEL of the above-mentioned asymmetric electron lens in a parallel state, and this electron beam forming means QEL is arranged on the above-mentioned asymmetric electron lens. The above-mentioned electron beam forming part GE side of the LEL. 2. The color picture tube device as claimed in claim 1, characterized in that the above-mentioned main electron lens part ML1 is an electron lens acting jointly on three electron beams, and the large-aperture asymmetric electron lens LEL of the main electron lens ML1 is at least above the The diverging region in the electron lens has a non-circular electron beam passage hole 73 whose vertical aperture is larger than the horizontal aperture, and the electron beam forming means QEL of the above-mentioned electron lens part ML1 is configured to sandwich the beam in the vertical direction. The advancing direction of the electron beam is a quadrupole electron lens composed of the electrodes of the four electrode plates 20, 21, 22, and 23 of the parallel electron beam. 3. The color picture tube device as claimed in claim 1, characterized in that the electron beam forming means QEL of the above-mentioned main electron lens part ML1 functions as an electron beam to be incident on the large-aperture asymmetrical electron lens LEL of the above-mentioned main electron lens part ML1. The electron beam in the center is more focused in the horizontal direction than the electron beams on both sides.

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