EP0574768B1 - Verfahren und Vorrichtung zum Magnetisieren eines Magnetrings im Hals einer Farbbildröhre - Google Patents

Verfahren und Vorrichtung zum Magnetisieren eines Magnetrings im Hals einer Farbbildröhre Download PDF

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Publication number
EP0574768B1
EP0574768B1 EP93108841A EP93108841A EP0574768B1 EP 0574768 B1 EP0574768 B1 EP 0574768B1 EP 93108841 A EP93108841 A EP 93108841A EP 93108841 A EP93108841 A EP 93108841A EP 0574768 B1 EP0574768 B1 EP 0574768B1
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EP
European Patent Office
Prior art keywords
magnetizing
currents
calibration
tube
magnet ring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP93108841A
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German (de)
English (en)
French (fr)
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EP0574768A1 (de
Inventor
Joachim Hassler
Rudi Lenk
Michael Neusch
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Panasonic Holdings Corp
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Nokia Technology GmbH
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/70—Arrangements for deflecting ray or beam
    • H01J29/701—Systems for correcting deviation or convergence of a plurality of beams by means of magnetic fields at least
    • H01J29/702—Convergence correction arrangements therefor
    • H01J29/703—Static convergence systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/44—Factory adjustment of completed discharge tubes or lamps to comply with desired tolerances

Definitions

  • the following relates to a method and a device for magnetizing a magnetic ring in the neck of a color picture tube with a plurality of electron beams.
  • in-line type in which three electron beams are generated in a horizontal plane.
  • delta type all of the following also apply accordingly to tubes of the "delta type”.
  • Fig. 8 illustrates a grid pattern as it is visible within the circle KV.
  • the three electron beams of the tube produce three cross-shaped grids, which are labeled R, G and B, respectively.
  • the cruciform grid lines must essentially coincide.
  • their horizontal lines should coincide essentially with the horizontal center line H of the tube.
  • the three horizontal lines each deviate from the horizontal center line H by a value YR, YG or YB.
  • a corresponding representation would be to indicate the deviation of the green horizontal line from the horizontal center line and the deviations of the red and blue horizontal lines from the green horizontal line.
  • the red and blue vertical lines are around XRGK and XBGK from the vertical green line. All deviations are typically up to a few millimeters.
  • Figures 9a and b illustrate what is visible within circles LL and LR, respectively.
  • the resolution is much finer than in the measurement illustrated by FIG. 8. It is namely not macroscopic grid lines that are considered, but landing spots 11 on fluorescent strips 12.
  • the centers MSL of the lighting spots 11 are offset by 40 ⁇ m to the left compared to the centers MDL of the lighting strips 12.
  • the electron beams To adjust the landing, one will shift electron beams in such a way that all the light spots are shifted to the right by 20 ⁇ m, so that the light spots at the measurement location LL are shifted to the left by 20 ⁇ m relative to the center of the light strips, while there is a corresponding shift to the right on the right.
  • the electron beams To shift the landing by 20 ⁇ m, the electron beams have to be turned around in the tube neck with the help of a static magnetic field be moved a few millimeters.
  • beam deviation is understood to mean a deviation from a target position.
  • Beam displacement is understood to mean the path by which an electron beam on the screen 10 has to be displaced with the aid of a magnetic field generated in the tube neck in order to achieve a desired position. This does not have to be the target position directly, but it can be an intermediate layer.
  • FIGS. 10b and 10c illustrate that this error is composed of a crossover error (FIG. 10b) and precisely the twist error (FIG. 10c). The individual influences of the two errors can be determined by the two measurements at the locations TL and TR.
  • a calibration tube is understood to be any tube with the aid of which the sensitivity of a magnetizing device when setting a magnetizing unit is examined.
  • a production tube is a tube of the same type, on which the errors explained above are measured, and in which a magnetic ring is then included Is magnetized with the aid of a magnetizing field, which is determined on the basis of the calibration data and the measured deviations.
  • each individual tube can first be used as a calibration tube and then as a production tube, in each case in the aforementioned sense.
  • a magnetizing device will be calibrated with the help of only one tube and then the values obtained with this tube will be applied to many production tubes.
  • FIG. 11 shows a magnetizing device on a color picture tube 13, which has an electron beam generating system 14 in the tube neck 15, which is only indicated schematically, and a deflector 16.
  • the electron gun 14 and the deflector 16 are operated by means of a tube control 17.
  • a tube control 17 In front of the screen 10 of the color picture tube, five measuring devices are arranged, which have the same designations as the measuring locations in FIG. 7. The measured values obtained from these measuring devices are summarized with MW.
  • a rear magnetic ring 18.H and a front magnetic ring 18.V are attached to the electron gun 14.
  • the rear magnetic ring 18.H lies approximately in the middle of the so-called focusing grating, while the front ring 18.V lies at the bottom of the so-called convergence pot.
  • the front ring is used to correct the twist error
  • the rear ring is used to correct the other errors mentioned above.
  • a front magnetizing unit 19.V which is controlled by a driver 22.V.
  • the rear magnet unit 19H and the front magnet unit 19.V illustrate the structure of the rear magnet unit 19.H and the front magnet unit 19.V.
  • the rear magnet unit has eight coils W1H to W8H, each of which can be operated individually by an associated current i1H to i8H.
  • the eight coils lie in a plane perpendicular to the tube neck 15 at mutual angles of 45 °.
  • the front magnetizing unit 19.V has four coils W1V to W4V, which can also be operated separately via an associated current i1V to i4V. All four coils are also in a plane at right angles to the tube neck 15, with a pairwise arrangement each offset by + 30 ° or -30 ° from the horizontal plane. From Fig. 12 it can also be seen that the rear magnetic ring 18.H is typically oval, while the front magnetic ring 18.V is typically round.
  • the magnetizing device also includes a display 26 on which, for. B. the measured values MW and data can be displayed, which are related to the sequence effected by the sequence control 25.
  • twist correction In practical operation of this device, as with all known devices, a clear distinction must be made between twist correction and correction of the other static errors.
  • the twist correction is done manually, if at all, while the other corrections are carried out automatically.
  • the user For the twist correction, the user first examines all the errors and, if there are no further errors, sets the magnetizing current so that the resulting magnetization of the front magnetic ring 18.V should just compensate for the twist error. If there are other errors, the user determines, based on experience, how much is under- or over-corrected.
  • the measurement of the deviations of the beam positions from target positions can be carried out by the user with the aid of a measuring microscope, whereupon the latter inputs the measured values into the calculation device 21, or the measured values can be recorded automatically, e.g. B. described in DE-A-32 06 913.
  • the procedure for magnetizing listed above is e.g. B. from DE-A-26 11 633 known.
  • Currents for generating 2-, 4- and 6-pole fields are determined here in the calibration process.
  • measured beam deviation genes are converted into magnetizing currents to generate such fields.
  • DE-A-28 28 710 states that such a method does not lead to useful results in practice.
  • a method is proposed that works without calibration, that sets currents through individual coils, and that impresses a magnetizing field into a magnetic ring with the help of an auxiliary field.
  • the currents through individual coils of a magnetizing unit are set in such a way that all beams assume their respective target positions.
  • the currents determined in this way are then multiplied by a factor, and the currents thus increased are reversed in sign.
  • a rotating field of decaying amplitude is superimposed on the magnetizing field generated in this way, i.e. a field whose temporal / spatial position changes so that, on average over time, it has the same effect in all spatial seals of this field regarding the impressing of the setting magnetizing field in the magnetic ring.
  • This method is disadvantageous in several ways.
  • it is very difficult to adjust the currents through the individual coils of the magnetizing unit in such a way that all the beams assume their respective target positions, since a current through a coil often does not only act in such a way that the magnetic field generated is an electron beam that still deviates from the target position moves into its target position, but at the same time acts in such a way that an electron beam that has already been set correctly is displaced out of the target position again.
  • Many current setting steps are therefore necessary in order to finally move all electron beams essentially into their respective desired positions.
  • it is problematic that it leads to unsatisfactory results if the same factor is used for converting setting currents into magnetizing currents for all currents.
  • the device according to the invention has the devices listed above, which are designed in such a way that they carry out the method steps just mentioned.
  • the method and the device according to the invention are based on the knowledge that currents as determined during calibration can be linearly superimposed for later correction of errors if the calibration was carried out taking two aspects into account.
  • the first is that an auxiliary field is used for impressing magnetizations, the amplitude of which decreases in time and the temporal / spatial position changes so that it averages over time in relation to the impressing of the calibration or setting magnetizing field in a magnetic ring in all spatial directions of this field in acts essentially the same. This procedure is known from DE-A-28 28 710.
  • the other important aspect is that the calibration takes place under exactly the same conditions as the later measuring magnetization, that is the effect of magnetizing currents on electron beams is not examined directly, but that magnetization is impressed with the aid of the magnetizing currents and the auxiliary field and then the influence of this magnetization on the rays is examined.
  • the calibrating relationship between magnetizing currents and beam shifts is therefore only an indirect one.
  • the magnetizing currents for the front magnetizing unit are calculated in such a way that when the front magnetic ring is magnetized, the positions of the outer electron beams are set in relation to the target positions, which amount is removed when the rear magnetic ring is magnetized.
  • step a1 the process controller 25 displays an operating mode query on the display 26.
  • the type of entry is examined in step a3. If calibration is selected, a calibration subroutine a4 runs, as is illustrated in greater detail by FIGS. 2 and 4. Then step a1 is reached again. If, on the other hand, magnetization is selected, a magnetization subroutine a5 runs, as is illustrated in greater detail by FIGS. 3 and 5. After this subroutine has been completed, step a1 follows again. If neither calibration nor magnetization has been selected by the input, other processes take place in a subroutine a6, e.g. B. the whole Procedure ended. Otherwise, the process returns to step a1.
  • the procedure according to this overview can be changed in many ways.
  • the subroutine a5 of magnetizing can run repeatedly until it is interrupted by key input. This means that one production tube after the other can be processed without having to select the magnetization process each time.
  • the flow chart according to FIG. 2 has three marks K1, K2 and K3, each before a step s1, s2 or s3, which marks are intended to illustrate the overview in the more detailed program of FIG. 4a. Since these steps are labeled in detail in FIG. 2, reference is made to this figure with regard to their content. There are three calibration steps, namely for the rear magnetization unit, the front magnetization unit and both magnetization units together with respect to an interaction as occurs in the case of twist correction.
  • Step s1 of FIG. 2 is divided into six individual steps s1.1 to s1.6 in FIG. 4a.
  • step s1.1 the consecutive numbering for the rear coils WmH (see FIG. 12a) is set to the value 1.
  • a given one Calibration current imH_KAL e.g. B. a current of 1 A, sent through the coil WmH, and this current is superimposed on a decaying rotating field, the z. B. decreases in 100 steps from 40 A to 5 A.
  • the rotating field and the calibration current are switched off (step s1.2).
  • step s1.3 After the rear magnetic ring 18.H has been magnetized using the process just mentioned, beam shifts SnH are measured in step s1.3.
  • the value n runs from 1 to 6, namely for the three electron beams R, G, B for the two spatial directions x and y which are at right angles to one another.
  • Sensitivities EmnH SnH / imH_KAL are calculated and stored from the six measured beam shifts (step s1.4).
  • step s1.5 it is examined whether the processes of steps s1 to s4 have already taken place for all of the eight coils in the rear magnetizing unit 19.H. Since this is not yet the case, a step s1.6 is reached in which the coil number m is increased by 1, whereupon steps s1.2 to s1.4 are repeated. The coil number is increased until the calibration for all eight coils of the rear magnetizing unit is completed.
  • step s2 of FIG. 2 is broken down into six steps s2.1 to s2.6, which differ from steps s1.1 to s1.6 .6 differ essentially only in that calibration steps for the four front coils W1V to W4V take place.
  • step s2.3 six beam displacement values are not measured as in step s1.3, but only four, namely only for the two outer beams R and B for the two spatial directions x and y. If in practice the four coils W1V to W4V could be built in exactly the same way, it would be sufficient to take only one measurement in the y direction, e.g. B. the shift of the beam R.
  • any four of the six available sizes ie the deviations for the three beams in the two coordinate directions, can be selected, but at least one measurement for an external beam in the y direction must be available.
  • the calibration between the marks K2 and K3 takes place with a view to later twist correction, that is to say an error which is noticeable in the y direction. It is therefore also necessary to carry out the measurements according to step s2.3 on an outer edge of the calibration tube, while the measurements according to step s1.3 are carried out in the middle of the tube.
  • FIG. 4b breaks down the calibration step s3 from FIG. 2 into six individual steps s3.1 to s3.6. Since these individual steps are labeled in detail in FIG. 4b, reference is made to FIG. 4b with regard to their content.
  • the value YRH_A means the deviation of the beam R in the y direction, as caused by the rear magnetic ring and as measured on the outer edge of the calibration tube.
  • the value YRH_M is the corresponding value as measured in the middle of the tube.
  • FIG. 5a shows a breakdown of step s4 from FIG. 3 into six individual steps s4.1 to s4.6.
  • steps s4.1 to s4.3 With regard to the content of steps s4.1 to s4.3, reference is made to the extensively labeled FIG. 5a and the explanations for FIGS. 8 and 9.
  • step s4.4 the twist YRT is determined as shown in FIG. 10c is shown. It is the twist error-related deviation in the y-direction of the beam R on an outer edge. In order to correct this deviation, shifts must be determined in a special way, which takes place in step s4.5. 6a, b, c will now be explained to illustrate step s4.5.
  • FIG. 6a illustrates a pure twist error for the beam R.
  • the horizontal raster line, as generated by this beam only coincides with the horizontal center line H in the center of the tube, while it is higher by the value YRT at the two outer edges. If an outer point is now shifted downward by the value YRTV_A, the center shifts downward by the distance YRTV_M, these two quantities forming the ratio FV, as was determined in calibration step s3.6.
  • This relationship is represented by equation (1) in Fig. 6 and illustrated in Fig. 6b.
  • the downward shift YRTV_A is greater than corresponds to the upward twist error YRT in the example case. This creates a lead, which is canceled again by magnetizing the rear magnetic ring.
  • the twist error is corrected if and only if equations (3) and (4) according to FIG. 6 are fulfilled, which state that the difference between the downward and then upward shifts is just a downward shift by the Correspond to twist errors, and that the downward and upward displacements in the middle must just cancel each other out.
  • equations (1) to (4) equations (5) and (6) result, from which equation (7) finally results in a value YRTH_M.
  • This value relates to the displacement of the beam R in the y direction, as is required to correct the twist T by magnetizing the rear magnetic ring 18.H in the center M of the screen when this beam is magnetized by the front magnetic ring 18.V. is shifted on the outer edge by the value YATV_A.
  • the corresponding values for the beam B are chosen to be the same, but reversed in sign.
  • step s4.5 the value YRTV_A is determined from the twist error YRT measured in step s4.4. This is used as the first correction value T1V. This is a correction as can be done by the front magnetic ring 18.V.
  • the second correction value C2V is set equal in amount, with the opposite sign. This is the shift YBTV_A required for beam B.
  • the resulting displacements YRTH_M and YBTH_M for the center of the screen are determined from these values with the aid of the sequence illustrated with reference to FIG. 6.
  • two further correction values C3V and C4V are each set to 0, which should represent the values XRTV_A and XBTV_A, i.e. shifts of the two outer beams in the x direction, caused by the magnetization of the front magnetic ring to correct the twist T.
  • This choice for the External rays in the x-direction are adapted to the corresponding selection in calibration step s2.3.
  • correction values C1H to C6H are calculated, as listed in the step mentioned.
  • Steps s4.1 to s4.6 After the steps s4.1 to s4.6 have been completed, six correction values CnH which apply to the rear magnetic ring and four correction values CnV which apply to the front magnetic ring are thus fixed. Steps s5.1 to s5.8 illustrate how magnetizing currents for the rear magnetizing unit 19.H are calculated from these correction values.
  • step s5.1 six equations, namely one for each of the six correction values C1H to C6H, are set up. Each correction value results from the sum of individual corrections as they are caused by the eight individual coil currents i1H to i8H. How a respective coil current, characterized by the index m, affects a respective one of the three beams in one of the two directions, characterized by the index n, is given by the sensitivities EmnH, as obtained in calibration step s1.4. Since eight currents are to be determined, but only six correction values are available, values for two currents are specified from a value table. The exemplary embodiment is values for the currents i3H and i7H.
  • step s5.2 the equation system for the six currents i1H, i2H, i4H, i5H, i6H and i8H can be solved, which is done in step s5.2.
  • the total magnetizing power required with these magnetizing currents is calculated, and the calculated value is stored (step s5.3).
  • step s5.4 it is examined whether all values for the currents i3H and i7H from the value table have already been processed. If this is not the case, the next values for these two currents are read out in a step s5.5, and the steps s5.2 to s5.4 are repeated. Finally it turns out that the whole In step s5.6, the table is processed and the solution for which the minimum output resulted. The associated values for the eight magnetizing currents in the H are saved.
  • step s5.7 the four equations for the currents are set up in the same way as the six equations in step s5.1.
  • the equation system is solved and the values for the magnetizing currents imV according to the solution are saved (step s5.8).
  • step s6.1 the magnetizing currents imH are set on the rear magnetizing unit 19.H, a decaying magnetic field is superimposed, and all currents are switched off when the amplitude of the rotating field falls below a threshold value.
  • the currents imV on the front magnetization unit 19.V are set accordingly, and magnetization takes place with the aid of a decaying rotating field.
  • the same values are used as for calibration. It should be noted at this point that the front rotating field is generated with larger currents, namely starting from around 60 A.
  • the exemplary embodiment described above can easily be simplified to the effect that all method steps which have to do with the automatic twist correction are omitted.
  • the twist is then not corrected at all, as is customary with different manufacturers, or a correction is made by hand, taking into account an advance, and then the remaining correction is carried out with the remaining procedural steps.
  • twist correction is carried out automatically, but if it is to be less precise than in the exemplary embodiment mentioned above, it is sufficient to measure a single twist deviation and to calculate a single correction current from this. This is then sent through the coils W1V and W2V in such a way that they generate magnetic poles of the same direction, while a current of the same magnitude is sent through the coils W3V and W4V in such a way that opposite poles are formed.
  • the design of the magnetizing units depends heavily on practical conditions. So z. B. for the front magnetizing unit 19.V uses four coils instead of just two, which lie in the vertical plane, since the heat occurring during magnetizing can be dissipated better than with only two coils over four coils. In the case of the rear magnetizing unit 19.H, eight instead of six coils are used, since all errors can then be corrected using magnetizing currents that can be achieved in a practically reasonable manner. In theory, to correct the six possible beam deviations, it would be sufficient to use six independently controllable coils. In the case of symmetrically arranged coils, however, this would require almost infinitely high magnetizing currents in the event of different deviations.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
EP93108841A 1992-06-13 1993-06-02 Verfahren und Vorrichtung zum Magnetisieren eines Magnetrings im Hals einer Farbbildröhre Expired - Lifetime EP0574768B1 (de)

Applications Claiming Priority (2)

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DE4219517 1992-06-13
DE4219517A DE4219517A1 (de) 1992-06-13 1992-06-13 Verfahren und Vorrichtung zum Magnetisieren eines Magnetrings im Hals einer Farbbildröhre

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EP0574768A1 EP0574768A1 (de) 1993-12-22
EP0574768B1 true EP0574768B1 (de) 1996-09-04

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US (1) US5466180A (ja)
EP (1) EP0574768B1 (ja)
JP (1) JP3287911B2 (ja)
DE (2) DE4219517A1 (ja)

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US7060074B2 (en) * 2001-11-28 2006-06-13 Wright Medical Technology, Inc. Instrumentation for minimally invasive unicompartmental knee replacement

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Publication number Priority date Publication date Assignee Title
NL170683C (nl) * 1975-04-01 1982-12-01 Philips Nv Werkwijze voor het vervaardigen van een statische convergentie-eenheid en een kleurenbeeldbuis voorzien van een convergentie-eenheid, vervaardigd onder toepassing van die werkwijze.
NL7707476A (nl) * 1977-07-06 1979-01-09 Philips Nv Werkwijze voor het vervaardigen van een kleuren- beeldbuis en kleurenbeeldbuis vervaardigd vol- gens die werkwijze.
US4138628A (en) * 1977-07-26 1979-02-06 Rca Corporation Magnetizing method for use with a cathode ray tube
DE2903734C2 (de) * 1979-02-01 1982-11-04 Standard Elektrik Lorenz Ag, 7000 Stuttgart Verfahren zum Einstellen von Konvergenz und Farbreinheit in Farbbildröhren
DE2907898A1 (de) * 1979-03-01 1980-09-11 Steingroever Erich Dr Ing Vielpolige vorrichtung und verfahren zum magnetisieren von ringfoermigen dauermagneten
NL7903468A (nl) * 1979-05-03 1980-11-05 Philips Nv Inrichting voor het meten en werkwijzen voor het meten en instellen van de convergentie van de elektronen- bundels in kleurenbeeldbuizen.
DE3206913A1 (de) * 1982-02-26 1983-09-22 Standard Elektrik Lorenz Ag, 7000 Stuttgart Messkopf zur erfassung der farbreinheit und der konvergenz bei einer farbbildroehre
FR2545265B1 (fr) * 1983-04-26 1985-12-13 Videocolor Sa Procede et appareil de reglage rapide, a l'aide d'un aimant permanent, de la convergence statique et de la purete d'un tube de television en couleurs
DE3368433D1 (en) * 1983-05-03 1987-01-29 Kanegafuchi Chemical Ind Polyvinyl chloride composition
NL8403112A (nl) * 1984-10-12 1986-05-01 Philips Nv Werkwijze voor het vervaardigen van een kleurenbeeldbuis en inrichting voor het uitvoeren van deze werkwijze.
NL8500862A (nl) * 1985-03-25 1986-10-16 Philips Nv Werkwijze voor het vervaardigen van een kleurenbeeldbuis en inrichting voor het uitvoeren van deze werkwijze.
JP2937386B2 (ja) * 1990-03-08 1999-08-23 株式会社東芝 カラー受像管の製造方法

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JPH06187911A (ja) 1994-07-08
DE4219517A1 (de) 1993-12-16
DE59303623D1 (de) 1996-10-10
EP0574768A1 (de) 1993-12-22
US5466180A (en) 1995-11-14
JP3287911B2 (ja) 2002-06-04

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