DE1812023A1 - Apparatus with a cathode ray tube and cathode ray tube for use in such a device - Google Patents

Description

"Device with a cathode ray tube and cathode ray tube for Application in such a device ".

The invention relates to a device with a cathode ray tube, in which an electron beam from a beam generator system generated and focused with the help of a focusing lens an impact plate hits in a short elongated spot, which device is a deflecting member for deflecting the elec · tronenatstrahls in a direction transverse to the impact licking of the undeflected Electron beam and a deflector for deflecting the elec-

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tronenatstrahls in the longitudinal direction of the Auftreffleckena of the nioht ab- ι

directed electron beam contains. In the following, the X- Direction always denotes the direction corresponding to the transverse direction of the impact spot of the undeflected electron beam, while with the Y-direction always that of the longitudinal direction of the incidence of the undeflected electron beam corresponding sighting is designated.

The invention further relates to a cathode ray tube for use in such a device.

| Although many known cathode ray tube devices may employ a cathode ray tube whose electron beam hits a target in a round spot it is known that for some devices with a cathode ray tube to work satisfactorily it is necessary that the electron beam hits the target in a narrow, elongated, e.g. elliptical, spots meets. This requirement is mostly due to the due to the special structure of the target, e.g. placed on devices in which the target plate contains a mosaic of separate elongated conductive elements, and on color television picture display devices in which the Auftreffplattg, the Cathode ray tube contains narrow strips of fluorescent material. A special The latter type of device is the so-called "index type" display device in which the cathode ray tubes are so-called "Index tube" is. The target of an "index tube" contains a > A multitude of narrow, almost parallel fluorescent strips, with neighboring strips lighting up in different colors when they are hit by electrons, while successive fluorescent strips are separated from one another by black ineffective strips.

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• Is on the fluorescent strip and the black strip on page 4 of a beam generator system one that is permeable to electrons Layer on which is parallel to the fluorescent strips in regulating own spaced strips are attached. Victories Stripes form the so-called index stripes to determine the position of the electron beam. The width of the fluorescent strips and the black strips must be particularly small so that an image of high quality can be obtained.

It is often desirable that this width be a few tenths of a millimeter at most. As a result, the electron beam must meet strict requirements. Primary colors are only reproduced correctly if the electron beam does not hit more than one fluorescent strip at a time. The dimension of the impact leakage of the electron beam in a direction perpendicular to the phosphor strips must therefore be almost equal to the width of these phosphor strips. Beam currents of up to a few mA are required to obtain sufficient brightness. In order to obtain a sufficiently small radiation dimension at these high currents in a direction perpendicular to the fluorescent strips at the location of the deflection means and at the location of the target and to avoid phosphor saturation at high radiation power as far as possible, it is necessary that the dimension of the impact leakage of the electron beam toward the phosphor stripes larger than those with respect to the ^SS to the phosphor stripes ride required small dimensions of the Auftreffleckena in an "au L _EUC hstoffstreifen vertical direction.

"" "A known device of those mentioned in the first paragraph. Kind contains one formed by a ring of ferromagnetic material EOcussing lens. The ring is concentric around the path of the elec-

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The electron beam is attached and is magnetized in a direction parallel to the path of the electron beam. On the outside surface de In the ring there is at least one block of ferromagnetic material that is attached in a non-magnetized state Gate direction will result in an elongated on tref f2, eokea, that due to the presence of the block of ferromagnetic material, the cross-section of the electron beam, which in the absence of such, Block is rotationally symmetrical, it is lengthened in the Y-direction. Of the The block is attached in such a way that a line that separates the block from the old The path of the electron beam connects to the desired T-direction is almost parallel. The appropriate dimensions of the block. · Are given in in practice determined by the fact that with one as closely as possible to the Impact plate focused several rotationally symmetrical electron beams Blocks made of ferromagic material must be attached! Until the required cross-beam clearance is achieved *

The above-mentioned known device has the disadvantage that the shape and the position of the point of incidence of the deflected electron beam differ from the shape and position of the point of incidence of the undeflected electron beam. This disadvantage is special large with a gate direction for deflection over large angles. In particular, such as a reproducing device from the "index" · Type "trained device changes the length of the application spot · mostly too fast as a function of the deflection angle, especially when the deflection means must ensure a constantly narrow point of impact At a certain deflection angle, the length of the impact spot is im generally a minimum value, with a dark ring or a ring of a certain color then being visible on the target when the playback device is in operation as a result of luminous substance saturation. the

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The color of the rings depends on the phosphors used a tilting movement of the impact licking in the XT plane, which results in an effective expansion of this spot, can calibrate this spot at the corners of the target plate extend on the same side as more than a fluorescent strip, whereby the quality of the color rendering is considerable · Ee can even contain incorrect index information are obtained while the beam has several index strips at the same time meets.

The invention aims to provide a gate direction that encountered these disadvantages

- 'A gate direction old a cathode ray tube in which a Electron beam that is generated by a beam generator system and focused with the aid of a focusing lens, hits an impact plate in a narrow, elongated spot and which a deflection element for deflecting the electron beam in the transverse direction of the point of incidence of the undeflected electron beam (X-direction) and a Deflector for deflecting the electron beam in the longitudinal direction of the Impact of the undeflected electron beam (Υ-fiiohtUng) is provided according to the invention with an astigmatic lens for obtaining an electron beam structure in which the undeflected electron beam with respect to partial beams in one to the mentioned transverse direction (X-direction) parallel plane almost to the Impact plate and, with respect to partial beams, in one of the aforementioned Longitudinal direction (Y-direction) parallel plane is focused at a point in front of the impingement plate on the side of the beam generator system * It should also be noted that the term "point" here denotes an area met, in which the partial beams meet and should not be interpreted in a mathematical sense *

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The invention is the. To establish that old a « Electron beam of this structure «in spots on the target can be obtained which, when the electron beam is deflected, does not ν; retains only a slight breadth, but also a relatively small one has a stable length, while also the effective expansion of the Spot at the corners of the target due to the tilting movement of the Speckle in the XY plane can be small. The electron beam is in with respect to partial beams in a plane parallel to the X-direction «almost focused on the target, so that the width of the

t hit leakage of the undeflected electron beam is small · Um When deflecting the electron beam, to maintain the narrow width of the impingement spot, deflection means are preferably used such that the meridional image plane of the deflection means is used for deflection in the X direction and the sagittal image plane of the deflecting means for Deflect in the T-direction coincide as much as possible with the target. (Sagittal focal lines are focal lines in the through-axis of the deflector and the plane passing through the axis of the beam · Meridional focal lines are focal lines perpendicular to the plane passing through the axis of the deflecting means and the axis of the beam. The sagittal

"The image plane is the plane in which the« agittal dividing lines are depicted "earth. The meridional image plane is the plane in which the meridional Focal lines are mapped.) Sa the electron beam with respect to Partial beams in a plane parallel to the Y-direction at a point in front of the impact plate (as seen from the 3tränierzeugerssyste) ' is focused, the sagittal image plane of the deflector for deflection in the X direction and the meridional image plane of the deflector for deflection in the Y direction lie in front of the target and is the influence of the curvature of these image surfaces on the length of the

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fleekens less than with a previously common beam structure in which the electron beam is focused with respect to partial beams in a plane parallel to the Y-direction behind the target • Agittal image plane of the deflector for deflection in the X direction and the neridional image plane of the deflector for deflection in the Y-direction can even cut the target, so that the length of the impact point passes an abrupt minimum value, such a minimum value is avoided in the case of a beam structure according to the invention. It has been found that the effective extension of the Impact licking due to the tilting movement of this spot in the case of a beam structure according to the invention can be smaller than in the case of the usual structure mentioned. The relative extension of the impact spot in the Deflection and the tilting motion of the landing spot on deflection are both dependent on the distance of the point at which the electron beam is in is focused with respect to partial beams in a plane parallel to the Y-direction, depends on the target plate and on the aberration coefficients of the deflection members * It has been shown that these are relative Lengthening and this tilting movement for given deflecting members generally cannot be reduced to a minimum at the same time by a specific choice of the distance mentioned} this distance can however, in embodiments of the device according to the invention such

It must be chosen that a reasonable compromise is achieved between the change in length and the tilting movement.

The device according to the invention can be designed in this way that the focusing lens is a lens element of the mentioned ' Includes astigmatic lens. To obtain the desired beam structure For example, the focusing lens can contain a quadrupole lens.

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The device according to the invention can also be designed in such a way that the radiator suction system is a lens element of the type mentioned Contains astigmatic lens. Bio device according to the invention preferably provided with a jet generating system, the at least a cathode, a first grid and a last one as a special electrode contains effective grid, this first 'grid a non has rotationally symmetrical Qeffnuag, di © © in © to one of the · Ablenkriöhtungen parallel short axis and a deflection to another has parallel long axis and which with respect to these axes is naheau is symmetrical. The opening in the first grid can have different geo-

"Have metric shapes, with two orthogonal® axes of symmetry being provided * An elliptical opening has the advantage that it can still be attached to the grid in a simple manner, for example using rods. Angular openings usually require intricate® technicians, such as Pub «Erosion machining. This ©". can be a: non-rotating "symmetrical" triode beam generating system "'consisting of a cathode _c , a first grid and a last grid acting as a command electrode the 'short axis® of the opening in the first

k Lattice and in sighting on the long axis of the opening la first lattice separate at different distances ¥ oa the cathode lying "linear" cluster knot beam cliittliaieia from partial beams, so that the harp due to the space charge! ge führt® Qu @ re <shnittsirergrSsserung dea electron beam than in a drehsymaetrisehen Strahlerzeugeresyetem In the Strahlerzeugeraisystöffi less, in which the partial beams of a single punktfSraigen StrahlJtnoten form ". Preferably, the short axis of the 0®ϊtnvng in the first grating parallel to the i-Hichtung, thus the sphSrisohe aberration in the Strahlerz © uger * »YS; ■ tem in terms of sub-beams in a _KU ^ _he x.Hichtung parallel

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In a device with a triode beam generating system oriented in this way, an aatigmatic lens element is also provided in addition to the beam generating system so that the beam cutting lines are mapped in a row order that corresponds to the row order of the associated beam beam lines in the beam generating system in which the beam cutting line fü ? Partial beams in a plane parallel to the short axis of the opening in the first grid is ^{closer to the lv} athode than the beam intersection node for partial beams in a plane parallel to the long axis of the opening in the first grid, is just opposite.

It should also be noted that one is not rotationally symmetrical

Triode gun system has already been described per se, but

the possibilities of such a beam generator system for improvement the mode of operation of a device in which an extremely narrow elongated constant impact leakage is desired for deflection, were not mentioned.

In the beam generator system there is preferably a second grid between the first and the last grid which, together with the cathode, the first grid and the last grid, forms the aforementioned astigmatic lens. This has the advantage that even wenff the candle axis of the ^above effnung in the first grid to the X-direction is parallel to provide a simple rotary symmetrical focusing lens is sufficient. The focus of the lung lens is preferably an electrostatic rotationally symmetrical focusing lens. It can easily be attached together with the beam generator system as one structure in the cathode ray tube. The spherical aberration in the direction of the short axis of the opening in the first grating can be caused by the presence of the second

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The grid is considerably smaller than in a triode beam generator system a®in. The geometry of the opening in the first grid can be designed in such a way that a beam intersection line appears in the beam generator. system of ^u effnung parallel plane in the first grating with respect to sub-beams in a to the direction of the long axis avoided, its g [o that the adverse influence of the induced by the space charge cross-sectional enlargement of the electron beam in the! itrahlerzeugerssystem lower than in a Triodenstrahlerzeugungssystess kaam _e Bi® opening in the second grid is preferably rotationally symmetrical, so that the | second grid can be easily made and centered.

The invention further relates to a cathode ray «· tube for use in the device described and in particular on a cathode ray tube, in which the target is narrow nahesu parallel fluorescent strips for the emission of different colored Liofotes contains. These fluorescent strips can be very narrow, especially in the case of a very favorable embodiment Furthermore, the cathode ray tube has a beam generator system and an electrostatic® rotary actuator Focusing lens contains * this 3-emitter & eugers system includes a cathode, a first grid, a second grid and a ™ last Git-tsr, whereby the first grid is not a threateningly symmetrical opening has a length that is almost parallel to the fluorescent strips Axis and a short axis almost perpendicular to the fluorescent strips Corn

The invention is based on an exemplary embodiment It is explained using the accompanying drawings

Fig. 1 shows the principle of a known playback device from Index typj

Pig. 2 shows the target in the known way

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dergabev, device according to Fig. 1 j

Fig. 3 shows the impact leakage of the electron beam at various Parts of the target plate of the known playback device according to Fig. 1; . ■

4 shows the behavior of the electron beam in the known device according to FIG

5 shows the behavior of the electron beam in a device according to the invention}

Fig. 6 shows a device with a cathode ray tube according to the invention}

7 shows in detail elements from the cathode ray tube according to FIG Fig. 6, and

Fig. 8 shows a partial section along the line VIII-III The figure shows schematically the beam generator system 1 of an index tube with the aid of which an electron beam 2 is generated. A focusing lens (not shown in FIG. 1) and deflection elements (not shown in FIG. 1) for deflecting the electron beam above the target are located between the beam generator system 1 and the target plate 3. 6 and 7, of which the stripes labeled 5 are blue, the stripes labeled 6 are red and the stripes marked with J are gfün. light up when hit by the electron beam. On each other

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The following ¹ fluorescent strips are separated from one another by black ineffective strips 8. On the fluorescent strips and the black strips there is a layer 9 that is conductive for electrons, which is interrupted to denote the fluorescent strips. This layer 9 serves to reflect light onto the front plate 4 and to protect the fluorescent strips from zone impact In the figure, an index stripe 10 is visible on the permeable layer 9 in front of every second black stripe. These strips 10 supply signals to indicate the position of the electron beam. The strips 10 can contain, for example, an ultraviolet phosphor that emits light in the blue part of the spectrum. A pulse is emitted from an index strip when the strip is hit by the electron beam. The figure shows a device in which such a pulse 11 is detected with the aid of a photomultiplier 12 which is fastened, for example, behind a window in the cone of the index tube (not shown in FIG. 1). The index signals from the photomultiplier are fed to a circle, with the help of which it is ensured that the color signals influence the electron beam at the right time. The circles for the electrical signals are not essential to the invention and are not shown in the drawing. From the reasons already mentioned in the introduction to the description, it was ensured that the impact leakage of the electron beam is elongated. The shape of the angle of incidence of the undeflected electron beam is indicated by the outline 13. The longitudinal direction of this »point of impact (the Y-blighting) corresponds to the direction of the fluorescent strips. The cross direction of this landing patch (the X direction) is. perpendicular to the fluorescent strips.

The resulting in the known device according to FIG

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Disadvantages are illustrated with reference to FIGS. 2 and 3. Fig. 2 shows the target of the index tube and the positions of parts A, B, C, D, E, F, G, H and I shown in detail in FIG. In these Parts of FIG. 3 are the fluorescent strips 5 »6.7 and the black ones Strip 8 of the target is arranged. A is a middle part of the Impact plate with the center 14 »on that of the impact spots 15 of the undeflected beam is shown. The impact leakage can change in the unfavorable way shown when deflected. On the Parts B and D have the impact licking a minimum length. This is a dark or colored ring due to saturation (16 in Fig. 2) visible on the target when the playback device is in operation. Attacking the corners of the target results in a considerable effective Expansion of the impact spot in the X direction as a result of the tilting movement of the point of impact in the XY plane. The point of impact shown in area I thus covers several fluorescent strips.

4 illustrates the behavior of the electron beam in FIG the device of FIG. 1, in which the invention is not applied. For example, there is the behavior of the electron beam when it is deflected shown in the Y direction. The way is shown in which the in Fig. 5 in the center 14 of A, in the center 17 of D and in the center, 18 landing spots represented by G can be obtained. Fig. 4 shows schematically the electron beam 2 in the through the axis I9 of the beam generator system plane going and perpendicular to the X-direction. the Electrons leave a symbolically represented focusing lens 20 and pass the symbolically represented deflection member 21 for distraction, of electrons in the Y direction. The sagittal image plane of this deflector coincides with target plate 3. The figure shows the Electron beam in position 22, in which the electron beam does not emit

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is directed, and in two positions 23 and 24 "which the" electron beam assumes after deflection. The undeflected electron beam is directed to the center 14 of A in FIG. 3 _o In position 23 the electron beam is on the center 1? vo & D in Fig. 3. In the position 24, the electron beam is directed to the center 18 of G ia ¥ ± g " 3". The undeflected electron beam is focused in a timpani 25 behind the target and the meridional image plane 26 intersects the target in 1? » so 'that the length of the Aiaftref-fleekens in the case of distraction is initially in 1? decreases to a minimum and that

_fe increases rapidly.

Fig. 5 illustrates the same as in * 'ig .. "4» "<- ^as behavior of the electron beam, but now in a Yorriehtung according to the invention. This figure shows schematically the electron beam 102 in the direction through the axis II9 of the beam generator system. going plane and perpendicular to the X-direction. ' The electrons leave a symbolically represented focusing lens 120 and pass the deflection element 121, which is similar to the deflection element 21 in FIG Shape and size like the hitting lick

ψ of the undeflected electron beam in position 22 in Pig »4. The deflected electron beam is shown again in two positions 123 and 124 in FIG. 126 is formed and the length of the point of impact does not change quickly as a function of the deflection angle and when deflected from the position in which the electron beam is not deflected, not a minimum *

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PHN.2949

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worth happening.

In the embodiment of a device according to the invention shown in FIG. 6, 40 denotes the glass envelope of an index tube, shown in a vertical section. The target 41 has the same structure as the target (3) in FIG. 1. The target contains 1200 vertical fluorescent strips 42, which are separated from one another by black stripes. The width of the fluorescent strips and the black strips is 0.21 mm. The index strips 44 are located on the aluminum layer 43. The beam generator system 45 and the rotationally symmetrical focusing lens 46 are arranged in the cover a taper of the electrode 52 is formed. The distance between the first grid 49 and the target plate is 385 mm. The rotary-symmetrical focusing lens 46 for electrostatically focusing the electron beam generated by the beam generating system contains the electrode 52, the focusing electrode 53 and the end electrode 54. The electrodes are centered with respect to the axis 55 of the tube. The supply lines to the electrodes and the support means for the electrodes are not shown. The neck of the tube is surrounded by deflection coils 47 for horizontal and vertical magnetic deflection at the point where it merges into the cone. The electron beam can be bent from the position in which it is not deflected and is oriented along the axis 55, at most over a diagonal of the target plate over an angle of 55 ^#. The index tube described herein is often referred to in the art as "110x index tubes" because the electron beam ^{can be deflected from -55 #} to + 55 *.

The radiator generation system 45 and the focusing lens 46

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. ._ "& 9V Fig. Β are shown in Fig. 7 · in a vertical section · This figure shows the. elektrononemi ttleran.de & äthöäeffiobe & f3 & $ he -56 ». Between »the emitting- V'thodehobe & flehe 56 ttmi - &» -'meftmm. 81 *

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tar 50 is the "land 57 of the ere * en grid 49 ₉ oils" a 0.075-sun. dead "Be * distance" feie · XatoodenoberflSche- § £ vea dta ¹ toe «advise custom ve '49 from the second sitter 30 if% ^; 0 # Έ50 -ttu stood'der wall 57 ^Äes first." grid * from the last -Grid. 51 is t «a« JIs electrode 52 has an - inner durometer in the f © rj®afBMg 5 ^ - * ®a 4 * 9 which increases to 20 mm. also an »indoor Durohoeftee? voa 20 a ** -. D®r W sswiaefaei! the electrodes. 52 vmä 53 ""and'der. Afeetaafi -'awisek® »€ ea p

53 and 54 are; both 2 ₀ 5 aua .. D @ r Abitaad of the wall "57 of the" jejpeten sitter · 49 from the mother. - the focussing electrode. S5s "which - eiae '-.! aage. - of $ 5 mm - has" iet 6Ö-mm. The wall 57. 4se eisten. Grid® "49 ha * ®t: a @ eiliptieche ^u @ffnung 58» whose: long Äefes® with ®ia @ s · lÄ ^ ®'w »- l ^ OfS m »M *» kreeht is «Di® _horizontal. courses 4ohse & ®s ^ üfTmaag 53 ha * ▼ on Op35 "O ea» Uae second grid 50 "hat- -eine- toetoyaaBf triedh 53 $ & ®i®n ixi & ll & nge O ₉ SOO aua and deyaa" Surbhaeese? e ^ eli 0 _{f is} S00 aa.

3Bi « Worm of. Oafffkungeis 5 © «» 4 59 iat'aue-'dea Sohaitt'äe'r .Hg · '8 er'eloh

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Bi®. With «Brteiel» electrodes have the Tori * i.o'htnat (see fig.

6) iSK cramped? the cathode 48. the following voltages a 9a ter 4f has a voltage swisehen -2? 0 f and -170? § dss «vti.te grid 50 has a voltage of 1 ^ 00 f | dl «liiektroi @ 52 has« ils® 25000 · ¥ 1 <! i® focusing electrode 53.'hat. a voltage of? 20Q ¥ |

the £ adelectrode'-54 has one. Voltage .van. 25000. V * ·. ■ ■

With "i"? Voltage of »170. f ww only © a Gitt'er. is des? - Ray «2" M. B®ir tt £ ®fat deflected. Biekts »®ep» trahi ia * ikfeef i »

Claims (12)

PHI.2949 [focused on partial beams in planes parallel to the horizontal direction close to the target plate 4t and with respect to partial beams in planes parallel to the vertical direction, this beam is then focused in a "point" which is at a distance of about 140 mm gate of the target is on the side of the beam generator system 45, the meridional image plane of the deflection coil for horizontal deflection and the sagittal image plane of the deflection coil for vertical deflection almost coincide with the target of the electron beam. uniformly towards the length of the incidence leak at the deflection angle of 55 * and which is less than twice the length of the incidence leak of the undeflected electron beam. The tilting movement of the impact licking remains smaller than 20 *. PATEKTASSPEÜECHEx 1. Device with a cathode ray tube in which an electron beam, which is generated by a beam generator system and with the help of a focusing lens, a target in one meets narrow elongated spots, which device a deflector member for deflecting the electron beam in the transverse direction of the impingement spot the undeflected electron beam and a deflection member for deflecting the electron beam in .er longitudinal direction of the point of impact of the undeflected electron beam, characterized in that an astigmatic lens for obtaining an electron beam structure of the electron beam in relation to partial beams in a plane that is almost parallel to the aforementioned performance on the target and with respect to partial beams in one of the Mentioned longitudinal direction parallel plane at a point in front of the 909831/084 ^ -ie- the target is focused on the side of the emitter system, is provided. _ -. : "| 2. Device according to claim 1, characterized in that the meridional image plane of the first reading member and the aagittal one ■ The image plane of the second deflector almost coincides with the target. 3. Device according to claim 1 or 2, characterized in that that the aforementioned focusing lens is a lens element of the aforementioned Contains astigmatic lens. 4 · Device according to claim; - characterized! that ™ the extended focusing lens contains a Tflßspoll lens. 5. The device according to claim 1, 2, 3 or 4, characterized in that the mentioned beam generator system contains an Idnseneleaient of the mentioned astigmatic lens. 6. Apparatus according to claim 5 »characterized in that the erwSKftle beam generating system contains at least one cathode, a first grid and a last _a ls accelerating electrode acting grating, which first grating having a non drehsymmetrisehe Oeffhung that an axis parallel to one of said deflection short axis and has a long axis parallel to the other direction of deflection and which is nearly symmetrical with respect to these axes. 7. Apparatus according to claim 6, characterized in that the opening i & first grid is elliptical. 8. Apparatus n _a ch claim 6 or?, Characterized in that a second grid-located between the first and the last grid, which together with the cathode "the first grating and the grating forms the last mentioned astigmatic lens .. 9. Apparatus according to claim 8, characterized in that, the opening in the second grid is rotationally symmetrical. 909831/084 $ OBlQlNAL INSPBCTED .2949 10. Correlation ri _B ch claim 6, 7 * 8 or 9, characterized in that the focus line is a rotating focusing line. 11. Torriohtung according to claim 10, characterized in that di «focusing» lins * an electrostatic rotationally symmetrical focusing » line 1st. 12. Cathode ray tube for use in an apparatus according to one of those approaching the goal. Expectations" 13 · Cathode ray tube according to claim 12, characterized by the fact that it contains the "axte impact plate", the narrow, almost parallel with metal electrons in different colors, luminous stripes «» have ·. ! 14 "Cathode ray generator according to Ansyruoh 13t characterized by" that it contains an anti-generator key "and an electrostatic rotary focus reduction lens and that the ray generator" system "has an athode, a first grille, a second grille and a last grille and then that The first sitter has a non-rotational symmetry "° eff nwag " ale has a long axis that is close to the fluorescent strips and a short axis that is almost perpendicular to the fluorescent strips. ~~ ORiGfNAL INSPECTS SG9831 / 084S