DE1487115A1 - Cathode ray tube - Google Patents

Description

Pi ;: Frfindu »& concerns- a single-jet Hachbeechlöunigungsmu? .VolraaBierungaröbra old of an enhanced color switch unit rait ssvrei pair ^ ii of external electrodes that are on gagöM Overlying outer surfaces of the neck part attached are and with c.v / ei pairs of internal electrodes that aua anoi nisderobjaigen material are produced and in Positions arranged according to the outer electrodes o.lntic Sine high resistance layer iat provided during the inner electrodes made of the low-resistance material are. The color switching is carried out by switching signals to the two pairs of outer electrodes are applied in opposite directions "

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(Art 711 At «2 No. t

BATHROOM OBiQINAL

K 4.9. T9i.,

You invention directs β i. for improvements in or on a color picture tube of the type in which the electron beam is deflected iod em two electrostatic fields are used change its angle of incidence on the grid in such a way that a color change is carried out. that the color switching is carried out by deflecting an electron beam by a magnetic field to its Angle of incidence on the grating au change, and that an electron beam electrostatically in a monochrome bsv «monochrome Stir is deflected «The process, in which a magnetic field is used, but requires a great performance for the intended purpose and it is accompanied by strong or, high-intensity, unwanted radiation «This method can can be used in a line-sequence television system. However, this method cannot be used in a point-sequence B color television system electrostatic deflection instead of using the magnetic field. However, this procedure occurs some problems with the installation of the duct for the Electrodes sucking in the electrostatic field and in the shielding of the neck part of the stirrer, since it is necessary » that the neck is longer than that of the conventional cathode ray tube. According to the present invention, inner and

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Outside © electrodes on the inside and on the outside of the Haleteilee attached and βie are electrostatically coupled and the sweeter electrodes are designed bsw. appropriate that they be earthed in direct current, thereby solving the problems mentioned above

The present invention aims to provide a color picture tube with an electron gun * at the electrodes on the Outside and on the inside of the neck part and in which an electron beam is deflected with a low power for color switching »

The invention also uses * a color picture tube of an electron gun of the kind to indicate that a color demodulator for a Sin electron gun is simplified

The invention also besweokt a color picture tube with a To indicate electron gun, in which the color veraerrang bsw. —Wearing and unnecessary radiation reduced to a minimum— be pressed * and which is consequently very stable during operation »

Other objects * Features and advantages of the invention will be apparent the following Besohreibtaag in connection with the enclosed Drawing clearly * in the:

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1 shows a SchaltdiagraaM tends, in don an example of a gea & lathodenatrahlruhre fi of the invention applied to a Farbferaaehbildröhre explained, lets

Figure 2 is a cross section of the main part of the cathode ray tube;

Figure 3 is a cross section taken along line A-A in Figure 2;

Figure 4 is an electrically equivalent circuit for the in Figure 2 main part shown; and

FIG. 5 is a graph showing a color switch bstw. Ttaeohaltelgnal represents

Referred to in Figure 1 1st 1 an antenna and with 2 a Farbeignalübertragungssysteai, a Irt "inanaslgnal T, a ChroBinanzsignal C _gt by the demodulated from a Ontertr &ger" horlBontale and vertical synchronization β! Be "pulse P _g and get _o 5 Let us generally beeichnet a color cathode ray tube, which is designed so that its electron gun 4 with a low-frequency ioaponente T ^ ₁ , b "B. 0 to 2 MHs of the signal signal T is supplied via an amplifier 5, with a high-frequency component T ^ of 2 to 4 MBs of the signal X and the ear signal Cg via an amplifier 6. The OhrowtnauKSignal Og is given to a color 8Tnchronl8ierung8elgnal ~ Sennelnriohtung 7. A rope is attached to the color synchronizing signal separating device 7

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The output of a horizontal deflection signal 8 is given to which the florisontal synchronization signal Pg has been given, which selects or "separates" a color synchronization signal f ₀ of 3.58 MHs applied to the sweeter electrodes 9b and 10a of the cathode ray tube 3 is obtained. Furthermore, part of the sinusoidal signal f_ is fed to a multiplier 11, from which a sinusoidal signal 2 t _g of 7.16 XHs is obtained, which is applied to the outer electrodes 9a and 10b. In addition, part of the sinusoidal signal f _e from 3.58 MHe a AusasteJgnalgenerator 12 executed, from which a test signal of 10.7 MHs is given to the electron gun 4, after this signal has been superimposed on the low-frequency component Yj ₁ , which is transmitted by the amplifier ο Furthermore, the outputs of the horizontal -Ablenkkreisöfi θ and a Vertlkal output circle 13 given to a deflection yoke 14,

The color cathode ray tube contains a color phosphor screen 16, which is set together from red, green and blue phosphor strips R, Q and B, which extend perpendicularly on the end face of the tube and are successively repeated

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Are arranged in order, which can be sB red, green, luke and red Xn the brace of the color phosphor screen let a color selection grid 17 arranged within the tube, which consists of many grid wires 17a, with the grid wires opposite the border lines between the green ones and blue phosphor stripe G and B are arranged parallel below the length of the phosphor stripes extend ₀ Sin electron beam 18 emerging from the electron gun 4, is so influenced that it always on the red phosphor stripes H to Meet t, and is applied to the Parbwahlgitter 17 applied a potential lower than the potential applied to the parabosphorus screen. In addition, the inner surface of a conical part 3a is covered with a high-voltage conductive layer 19, to which a high potential is applied

According to the present invention, two pairs of electrodes 9a, 9b and 10a ₉ 10b are attached or arranged on a neck portion of the tube behind and in front of the deflection yoke 14. The electrodes of each pair are arranged opposite one another in a direction perpendicular to the direction of the phosphor strips · These electrodes may be placed close to the deflection yoke 14, or may for filing under this are ₀ and they are "formed of a conductive material B _e 'by vapor deposition or by a coating of s Furthermore, it is forthcoming

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so that the electrodes are located in front of the deflection yoke 14, so that the rope extends over the conical rope of the tube. 9b and 10a, 10b correspond. The passage to the low «-impedance layers is ttbersogen nit a hochohmlgen layer 20 having a later su descriptive Wider able value _o One end of the hoohohmigen layer 20 is AC grounded" Ss is desirable that the area of each of the low layers 36a, 36h, 37a and 37b is larger than that corresponding to each of the electrodes 9a, 9b and 10a, 10b. In the example shown, the high-resistance layer 20 is formed around the low-resistance layers 36a, 56b, 37a and 57b and on the inner surface of the conical rope 3a and the base part 3b between the high-voltage conductive layer 19 and the electron gun 4. Hats 21 formed in the high-resistance layers 20 parallel to the axis of the tube in order to apply a high voltage to the electron gun 4 from the high-voltage capable layer 19. A conductor 22 is formed in each slot 21, both ends of which are connected to the high-voltage conductive layer 19 of the electron gun 4. One end of each high resistance layer 20 is grounded in alternating current via the conductive layer 19, the conductors 22 are each connected to one end

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Place corresponding to the intermediate part «wipe the electrodes 9a and 9b.

Car hold signals are given to the outer electrodes 9a, 9b and 10a, 10b. For this purpose, the output gill of the earbolt signal generator 15 is connected between the electrode 9b and earth, while the output of the multiplier 11 is used to generate the signal 2f _ß , namely the! Reis tsvac formation of the signal 2Γ - between the other electrode 9a and earth connected 1st. Similarly, the output side of the Sarb switch signal generator 15 and the output of the multiplier are connected to the other pair of electrodes 10a and 10b, respectively, but the connections are made in opposite directions to the electrodes 9a and 9b. The heifit that Besiehung is such that, when 1st, the output end of the circuit 15 connected to the electrode 9b, this old electrode connected 10a is a Further 1st an Absohirmplatte on the outside of the external electrodes 9a, 9b and 1oa ₉ 10b fiber a Isolation layer arranged

Step into the parabola cathode ray tube described above electrostatic capacities, as shown in Figure 4 with 25a and 251 » beee are leaning, sswischen the electrodes 9a, 9b. One electrostatic capacity, which is equal to 26, results

BATH O.

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eloh the same mrlsohen the opposite layers (96a) and (56b), within the neck part, since the layers 20 have a considerably high resistance value. These capacitances 25a, 25b and 26 are equivalent to those which, as shown in In FIG. 4 is shown connected in series with one another. Furthermore, since the band of each high resistance layer 20 in AC current is grounded, the connection points between the Capacities 25a and 26 or 25b and 26 through leakage resistors 27a and 27b of the high-resistance layers grounded in alternating current. With the reference characters 28a, 2Sb, 29a and 29b are capacities denotes which "occur between the electrodes 9a, 9b, 10a and 10b and the shielding plate 24" with the reference symbols 38a, 38b, 39a and 59b are capacitances that are between the Low-resistance electrodes 56a, 36b, 37a and 37b and the end plate 24 occur. This includes that the color content signal generator 15 between one end 30b of the series capacitances and earth and that the multiplier 11 «wipe the other End of 30a and earth is switched »Xn this Pail are the off» aisles of circles 15 and 11 and capacities 28b move 28a, which are connected in parallel therewith, are arranged or designed in such a way that they produce a parallel resonance. in relation to the Signals f_ bsw "2f_ result or" represent *

The resistance value of the high resistance layers 20 becomes such

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chosen that the time constant determined by the resistance of the bleeder resistors 27a and. 27b and the capacitance value of the Kapasltät 25a or 25b depends, is sufficiently larger than the period of the Parbschaltsignals ί «, since the distance» between the electrodes of the Xapasität 23a or 25b is smaller than that of the Eapasität 26 and the dielectric constant between the electrodes is greater than that the capacitance 26 is "so the Kapasitätewert the capacitance 25a or 25b is considerably larger than that of the capacitance 26 'will, accordingly, the signal f _ß ewischen the Xleisaien 30a and 30b, namely gwischen the electrodes 9a and applied 9b or abandoned and all nahesra its Signalsp & nmmg is on the 3 & pasität 26 concentrated That is, there is an electrostatic JoId of £ _ signal in the QaIsteil 3b corresponding to the rope between the electrodes 9a and 9b generates _o in a similar fashion, an electrostatic PEiD the signals 2 £ _ö of the tube * These electrostatic fields are put together to form an electrostatic switch oil & 31, as shown in F igur 5 is inclined to generate, which changes over time,

In a similar way, there is a fine electrostatic parabolic switch baw "Dmsehaltfeld 32 Wipe the low-resistance layers 37a and 37b in of the tube through the applied to electrodes IQa and 10b Signals obtained «This electrostatic field 32 is in the

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Those opposite to that by the electrodes 9a and 9V> is being built. In Pigur 4, bits are referenced 33a and 33b denotes capacitances which are formed by the electrodes 10a and 10b and the low-resistance layers 37a and 37b · With the reference numeral 34 let denotes a capacitance that is between the low-resistance layers 37a and 37b is formed, and 35 denotes a leakage resistance between these capacitances.

Sa the electrostatic fields are formed in the tube as described above and since the electron beam 18 is not deflected by the outer electrodes 9a, 9b and 10a, 10b in the envelope ti 31 R of the color switching signal θ 31, the electron beam strikes the red phosphor strip R. As described above _e Similarly, when the color switching signal approaches its negative peak 31G, the electrode 9b becomes negative, whereby the electron beam 18 diverges to the electrode 9a side and then converges to the electrode 10b side and then it encounters a green phosphor strip G adjacent to the red phosphor strip R. When the color retention signal 31 approaches its positive peak value 31 B, the electron beam 18 diverges and subsequently converges in the opposite directions from the directions just mentioned, and it then hits the claws of phosphor strip B in this way

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If the electron beam is electrostatically deflected by the cobalt signal and the signal is synchronized with the tarominan signal that is sent to the electron gun 4 is, ßod that a color image is reproduced on the Sarbphosphorsohlrm 16 ο

If the capacitance values of the lapaeit & th 25a and 25b sum example 100 ρϊ and the resistance value of the leakage resistors 27a and 27b 10 ΜΛ, your time constant is one millisecond. This time constant is sufficiently larger than the perlode of the color switching signal when a color reproduction is carried out using the point quenching method. Accordingly, this invention is applicable not only to unctuated color reproduction but also to cell sequence reproduction at a frequency lower than 3.58 MHB by 5.25 kHB chosen that the charges which accumulate on the inner wall of the tube by secondary electrons generated in the tube can be discharged through the layers 20. Beam current of approximately 500 nk. _t if second electrons of 50 nA., which is about 1/8 of the current, are emltlert from the? ar>"* * grid 17 and some secondary electrons of 20 nl, which is about 1 / 2.5-fold of 50 pA, the hoohobmigen Bchioh-

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The voltage drop in each leakage resistor 27a or 27b amounts to when its resistance value is approximately 10 millet, 10 pk χ 10 ΜΔ 100 volts. The value is significantly smaller than the peak value (approx. 1.5 kV from column to column) the Jarbeo holding value 51, β © daft «if the leakage resistors 27a and 27b have a range of 1 to 10 HA beelteea, an electrostatic holding field in the tube is built up and the potential distribution in the tube is not disturbed. The high-altitude layers 20 can be formed by vapor deposition of β »Β · Chronaxyd«

If the Spiteenwert der L & rbeobaltenignale 1.5 kV from Spitee en Spitsse (which can be achieved if the deflection angle on the shark part is selected about 1 ° 28 *) and the capacitance of the capacitors 25a and 25b is 50 pJf , the Reactive power, which flows through the two Xapasltttten 25a and 25b with a color fold signal of 3 »58 KBm, approx. 515 Y * If the inductance of a coil, which is connected to both stages of the series capacitors, amounts to about 40 jiH and the coil eo is formed , that it is in Reeonans with the Jarbsohalta signal and its Q (figure of merit) is about 120, eo amounts to the power

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dee color hold signal 2.5 W, in practice, bsw · during the In operation, the capacities 25a and 25b can be smaller can be sewn, and therefore the deflection performance can also be tarring type. Since Jedoeh has capacities 28a, 28b, 29a and 29b »like one η dan electrodes 9a, 9b, 10a, 10b and dar Absohiraplatte 24 should be approximately 30 ble 200 pP, so it lies The distraction in the practice 1 »Bereloh of 3 Dia 10 W.

In the case of a chromatron tube, which has a smoother color because the yarbphoephoreohira is arranged opposite, the capacity of the lattice is approximately 2000 pF _{t, the} Parb-βehaltsignal has approximately 400 T τοη peaks outside, the reactive power is approximately 2000 V and the deflection power is approximately 25 W (fall Q - 80). These values are approximately 4 and 10HBBaI ao as large as the values for the cathode ray tube according to the invention. Walter is informed that the color change is carried out electromagnetically in the vicinity of the Halstellee. In this case the capacity of the resonance circuit including the deflection is approximately 700yk% f, the Varbachalta signal has 700? τοη Spitsa an 8plt * e or ao about, the reactive power is 1000 W and the deflection is approximately 11 W (Iv case that Q - 90), these values are about 5.5- and 4.5- * al ao large like the values of the cathode ray tube according to the invention.

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The foregoing also shows that the tube according to the invention requires an octree of low power for color switching. Zusftteilch let ä9T structure of Earbueechalteinrlohtnng very simple, as is apparent from the drawing, _β Further, corresponding to the spacing of the Sitterdrflhte 17a de "Parb-

three

Wahlgittere 17 of the width tow Phosphorstrelf en and this distance is greater than that in the herJcöemliohen Chrtaatronröhreo With the device according to the invention, not everyone can work svelte grid wire 17a are connected to one another, and Adjacent grids do not have to be vonelnandi be isolated, from which an easy production Ä? * r Cathode ray tube results. BarQberhlnaus is the number of Phosphorus strips, which the picture elements always next to each other " lying Oittei ^ rähten 17a form, large, so that a picture old high resolution.

Pie earbud frequency is 5.58 KHB, but the deflection required is small as described above. As a result, a sheet metal electron beam deflection with a low power is obtained by such a color maintenance signal, in which the signal 2f _g with doubled BSW. A multiplied frequency is superimposed on the signal £ ₀ , the period of time during which the neutron beam remains on each phosphor strip is lengthened, as is shown in FIG

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Fig. 5 is shown, and the period during which the electron beam is guided from a phosphor strip to the adjacent phosphor strip is shortened. For this reason, when using such a light switch, a cathode single beam tube is obtained that has no color errors and It is safe to operate «Furthermore, in this case the signals f _e and 2f_ can be applied separately between one of the electrodes 9a and 9b and earth and when the capacitances 28a and 28b» between the electrodes 9a and 9b and the separating plate 24, each as one element of the resonance circuit a of the signal supply circuit, the termination plate 24 can be used as an element of the input circuit of the taring circuit as well as to serve to prevent the dark switching signal from emitting outwards. In such a case, the signals f "and 2f_ could be applied in series between"'one of the electrodes and earth, but in this case, even if each of the capacitors 28a and 28b is used as an input circuit for the signal, a further capacitance element becomes as another input circuit required · In the cathode ray tube according to the invention, however, such a capacity measuring element is not required »

It was considered, stubbornly carrying out the electrostatic maintenance, a Parbechalt baffle in the cathode

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cathode ray tube in the same manner as an electrostatic deflector plate in a conventional electrostatic deflector cathode ray tube. A supply line for the deflection voltage must, however, be led out of the tube into this area, and the same high potential as that which is applied to the high voltage conductive layer 19 must be guided in the switch deflection plate in order to ensure that the potential along the electron beam path is not is disturbed by attaching the largescale deflector plate. Therefore ianfi the insulation of the cable mm applying the Ableiikwechselspannung and sub applying the high voltage be given special attention, · This makes it difficult ,, ansubringen the deflection yoke and the Xinsetsen the larbschaltablenkplatte is tmeöglioh. In the cathode beam gun, however, the electrodes 9a, 9b and 10a ₉ 10b are given the same signal and they are always earthed so that insulation as difficult as described above is not necessary. Furthermore, sit ledlglioh the Hektroden 9 »· 9b and ausgeflbt 1oa ₉ 10b on the AuJenseite the pipes a solo" adverse Blaflm · tHe the ftmswfUoas da * aOsteiles 3b old 0 elsktroaam auigeladeA is as above besohriebem w «« e ₉ Sun dai the potential ame Π al ti mum Iraiilbatin rerladert waturoli «i» »iilmiinw» a—

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will »Um this sra. report that the high voltage conductive layer 19 on the inner surface of the tube part 3b is extended to positions corresponding to the electrodes 9a, 9b and 10a, 10b. The hochspannungeleitende layer 19 is grounded in alternating current, so that no is erseugt larbschaltfeld "In the erfindungsgemäfien cathode ray tube, the low impedance layers 36a, 36b _v 57a and 37b in the sharks part in positions opposite to the electrode 9a, 9b and 10a, 10b are provided, and the high-resistance layer 20 is provided at the point around the low-resistance layers 36a, 36b, 37a and 37b, and its resistance value bsw “-values is bsw” are selected as described above ο This allows a Sarbechaltfeld to be built up in the tube without any disturbance and the inner tube of the tube has an oil current potential (e.g. a potential of equal Yorselohens against Brde). That is to say, there is no possibility that the potential of the electron beam path changes, ie the tokenization of the hectic rays is worsened. Furthermore, with the conductors 22, which are in the AaMyarungCA • sw. Iktea 21 im de · hteholmiigeu 8okiehem 89 amegebUAet sirni, an EoobsTmiouag with a mledrlgtn Vüeamtiad vom 4er bjoehspaamngsleiteaden 8ohioht 19 fiber 41 · Head of ZZ ma der hectro-4 created wexdtm.

the before) Mxm »h« alm ttmtkttllMmf viit Um

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superimposed on the signal f _ß , but a larbeohaltslgnal can also be detected by the upper tier of a signal 3f _ß »which has a frequency that is three times as high as that of the signal f _fl . In some cases, the color switching can be carried out by the signal f_ alone, and in such a height the signal f _{ß can be given} to the electrodes 9a and 9b in the opposite direction. The meaning of the terms " ^{grounded in direct current 11} or" grounded in alternating current "can be seen in FIG.

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Claims (2)

Claims 1 «cathode ray tube with an electron gun, one Color phosphor screen that drift out of phosphorus and. a high-speed accelerator and pokueeing grid built 1st, that facing these strips, with two pairs of Electrodes placed on the outside of the neck, with the electrodes of each pair facing each other, with low-resistance layers that are applied to the inner surface of the neck part at points opposite the electrodes, with a high-resistance layer that is applied at the point is arranged around these low-resistance layers, the ends of these high-resistance layers being grounded in alternating current are, with a device to provide an AC deflection voltage sswisohen one electrode of each pair of the electrodes and to apply ground, and with means to wipe the other AC deflection voltage from the other electrode and to apply earth, whereby an electrostatic deflection field is established between the electrodes, consisting of the is composed of two alternating current deflection voltages, 2. color cathode ray tube according to claim 1, characterized that the deflection voltages, applied to the pairs of 809812/1019 _f 4 new documents ( _A n. _7§1 A _b , ₂ N, _1S au3 _deaÄ n _d e _rU n _gsfl e, _v . ₄ .9.i, ^ ^. ι · w ι · ■ Electrodes are given in the opposite direction stand to each other in order to change the angle of incidence of an electrode beam on the Hachablenk- und Pokusslerungsgltter ssu. 3 "!" ^ Cathode ray tube according to claim 1, characterized in that the two pairs of electrodes are in direct current are grounded. 4 ο color cathodon ray tube according to claim 1, characterized in that a bottom plate is provided for the electrodes M ^V ORIGINAL INSrECT | D 0O9812 / 1Ot $