EP0123613A2 - Vorrichtung zur räumlichen Einstellung einer Ablenkeinheit bei einer Fernsehröhre, insbesondere bei einer Farbfernsehröhre - Google Patents

Vorrichtung zur räumlichen Einstellung einer Ablenkeinheit bei einer Fernsehröhre, insbesondere bei einer Farbfernsehröhre Download PDF

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Publication number
EP0123613A2
EP0123613A2 EP84400761A EP84400761A EP0123613A2 EP 0123613 A2 EP0123613 A2 EP 0123613A2 EP 84400761 A EP84400761 A EP 84400761A EP 84400761 A EP84400761 A EP 84400761A EP 0123613 A2 EP0123613 A2 EP 0123613A2
Authority
EP
European Patent Office
Prior art keywords
platform
tube
deflector
freedom
arms
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.)
Granted
Application number
EP84400761A
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English (en)
French (fr)
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EP0123613B1 (de
EP0123613A3 (en
Inventor
Claude Pons
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Videocolor SA
Original Assignee
Videocolor SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Videocolor SA filed Critical Videocolor SA
Priority to AT84400761T priority Critical patent/ATE35879T1/de
Publication of EP0123613A2 publication Critical patent/EP0123613A2/de
Publication of EP0123613A3 publication Critical patent/EP0123613A3/fr
Application granted granted Critical
Publication of EP0123613B1 publication Critical patent/EP0123613B1/de
Expired legal-status Critical Current

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Classifications

    • 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 invention relates to an apparatus for adjusting the position of a deflector on a television tube, in particular in color of the mask type.
  • a television tube includes a screen on which are deposited phosphors which emit light when struck by an electron beam. The latter is generated by an electron gun inside the tube and the displacement of the electron beam, to move the light point, along lines is obtained by variation of magnetic fields produced by variable currents in coils called deflectors.
  • the positioning of the deflector relative to the tube must be particularly careful because any defect in this positioning results in a deterioration of the image reproduced on the screen.
  • the adjustment of the position of the deflector relative to the tube is particularly delicate, in particular for color television tubes, especially if one wants to have an autoconvergent system, that is to say one which does not require d, corrections made by the circuits associated with the deflector-tube assembly.
  • the screen is covered with triplets of luminescent substances, each element of the triplet being of a fundamental red, green and blue color and three electron guns are provided, one gun having to excite a determined color. ; so in a self-converging tube it is the deflector which ensures the convergence of the three electron beams over the entire surface of the screen; each electron beam must also reach only the phosphors of the corresponding color. Convergence is obtained by a displacement of the deflector parallel to the screen while the purity of the colors (the beam intended for a color only reaches the phosphors of this color) is adjusted by displacement of the deflector perpendicular to the screen.
  • the means for controlling and moving the deflector support consist of a carriage and rocking mechanism which is relatively complex.
  • the adjustment operation is difficult since it involves several parameters at the same time; moreover, it is painful because the operator must constantly observe the bright screen.
  • the apparatus according to the invention does not have these drawbacks.
  • the support comprises a platform which is horizontal in its average position and is carried by n oblique arms regularly distributed around the deflector, each of which has a translational movement command at its base.
  • the automatic loading of the tube on the platform and the adjustments are easy.
  • a large space can be provided for the devices for feeding the tube between the arms, under the platform.
  • the forces being better distributed over the arms these can be dimensioned less consistently than in the known apparatus.
  • the apparatus according to the invention can be fully automated.
  • you must first carry out a calibration, i.e. measure precisely the effect of the different movements of the deflector, according to each of its degrees of freedom, on the convergence and the purity of the image reproduced on the screen.
  • a calibration instead of using empirical measurements, a calculation can be made.
  • the program me which is within the reach of those skilled in the art, varies depending on the type of tube to be adjusted.
  • each linear displacement element is connected to the support of the deflector by means of an arm, one end of which is connected by a ball joint to said element and the other end is connected by another ball joint to the support.
  • ball joints are for example simple flexible rods the ends of which are embedded in the parts which they connect: the first flexible rod forming a ball joint is embedded on the one hand in the element with linear displacement and on the other hand in the arm , while the second ball joint is embedded by one end in said arm and by the other end, in a connecting device fixed to the platform.
  • the number n of elements with linear displacement is preferably equal to six, which allows the support to be displaced in all directions.
  • the position of a solid in space is determined by six parameters (corresponding to the six degrees of freedom): three coordinates for the position of a point of this solid and three other coordinates for the orientation of the solid in space.
  • the device for adjusting the position of a deflector 10 relative to the screen 10 of a color television tube 10 2 comprises a horizontal platform 11 of generally circular shape having a central opening 12 forming receiving housing for the diverter 10.
  • This deflector 10 is fixed to the platform 11 by means of jaws 13, the displacement of each of which is controlled by a jack 14.
  • the end of each of the jaws 13 has a notch 15 cooperating with a projection 16 at the periphery of the carcass of the deflector.
  • the platform 11 is supported by six arms or legs 17, 18, 19, 20, 21 and 22 each of which is movable to vary the position of the platform 11, and therefore that of the diverter 10, by compared to the tube. Each arm ensures the mobility of the platform 11, and therefore also that of the diverter 10, according to a degree of freedom.
  • the arms 17 to 22 are identical to each other.
  • This arm comprises a rigid rod 25 at the ends of which sockets 26, 27 are fixed.
  • the sleeve 26 at the upper end of the rod 25 accommodates a certain length of a cylindrical rod 28 of small diameter which is both resistant and flexible, for example being of the piano string type.
  • the upper end of this small diameter rod 28 is also embedded in a socket 29 fixed under the platform 11.
  • This rod 28 between the sockets 26 and 29 forms a ball without play.
  • the sleeve 27 at the lower end of the rigid rod 25 houses the upper end of a rod 30 of the piano string type identical to the rod 28 and forming like it a ball joint without play.
  • the lower end of the latter rod 30 is embedded in a sleeve 31 movable in a linear movement, that is to say in a simple translation.
  • the sleeve 31 is integral with a cylinder 32 projecting from a piston 32a and the lower end of which has a thread cooperating with a screw 33 driven in rotation by a stepping motor 34.
  • the piston 32a is square section; it has at its periphery slides 32 b made of plastic to facilitate the sliding in a channel 35 of a frame 36 to which the support 37 of the motor 34 is fixed.
  • the square section of the piston 32 a and therefore of the channel 35 prevents rotation of this piston; thus the latter only moves in translation.
  • the position of the piston 32, and therefore those of the bush 31 and of the ball joint 30, is measured by a transducer 37 comprising, in the example, a rod 38 fixed to the bush 31 by means of a bent arm 39 so that this rod 38 is parallel to the axis common to the socket 31 and to the screw 33.
  • This rod 38 actuates, for example, the cursor of a potentiometer, the electrical signal at the terminals of this potentiometer then representing the position udder your 32a.
  • the body 40 of said transducer 37 is, like the support 37a of the motor 34, fixed to the frame 36.
  • FIG. 3 schematically represents the horizontal projections of the various arms 17 to 22 when the platform 11 is horizontal.
  • the end 17 1 of the arm 17 represents the axis of articulation of the ball joint 28 and the end 17 2 corresponds to the axis of articulation of the ball joint 30.
  • the ends of each of the other arms correspond, in this figure 3, to the axes of articulation of the upper and lower ball joints.
  • the axes of articulation of the upper ball joints are arranged on a circle 45 - which, in the example, has a diameter of 470 mm - in groups of two near the vertices 46, 47 and 48 of an equilateral triangle inscribed in this circle 45.
  • the projections of these arms are perpendicular to the adjacent sides of the equilateral triangle. These projections are therefore two by two parallel; the projection of the arm 17 is thus parallel to that of the arm 19.
  • the arms form an angle of 45 ° with the vertical when the platform 11 is horizontal (this is its starting position).
  • the axis of the rod 25 is therefore coincident with the axis of the sleeve 31; it follows that the translation axes are also always inclined at 45 ° relative to the vertical.
  • the distance between the ball joints 28 and 30 is of the order of 160 mm while the free length of each of the rods 28 and 30 is 15 mm and its diameter 1.5 mm.
  • the articulation formed by these rods 28 and 30 behaves as if a perfect ball was located in the middle of the free parts of these rods 28 and 30.
  • FIG. 5 is a diagram illustrating the movement of the arm 17 with its articulations at the ends, on the one hand in a state of equilibrium for which the axis of translation of the sleeve 31 is aligned with the axis of the rod 25 and on the other hand, when the stepping motor 34 has been turned so as to move the bushing 31 downwards, that is to say the articulation of the rod 30.
  • the first state of the rod 25 is represented by the segment A 0 B 0 , A 0 and B 0 being the articulations of the rods 28 and 30. It corresponds to the horizontal position of the platform II, position for which the rod A 0 B 0 is aligned with the axis of translation of the mechanism.
  • Detectors 50, 51, 52 (FIG. 2) determine the convergence and purity errors visible on the screen 10 1 and a computer (not shown) makes it possible, from these measurements, to determine the displacements of the points B 0 qu 'It will be necessary for the deflector 10 to move so that in its new position, after displacement, the errors are corrected. So to get the correction you have to move point B O to point B (figure 5).
  • point A O must be moved to A by a translation of the piston 32a.
  • a 0 B 0 AB
  • the arm 25 does not change length from one position to another.
  • the computer determines whether the translation A 0 A allows the measured errors to be corrected.
  • the displacements A 0 A can be progressive.
  • the apparatus according to the invention allows only small amplitude displacements of the deflector, which is sufficient for adjusting the position of this deflector relative to the other elements of the color television tube. Compared to three orthonormal axes formed by the usual axes of symmetry of a tube, the device allows rotations of maximum ⁇ 3 ° around each axis and translations of maximum - 4 mm along each of these axes .
  • the various parts of the device have negligible play. This is particularly the case for the joints which are free of play.
  • the legs support the platform 11 very rigidly. In this way, the positioning of the platform 11, and therefore of the diverter 10, is always ensured very precisely.
  • the device easily adapts to various types of deflectors. It can also be used with a minimum of modifications for adjusting the position of deflectors on tubes of different sizes and / or geometries.
  • the adaptability of the device results from its six degrees of freedom which allow all movements around a reference position. To switch from one tube deflector configuration to another, the device does not have to undergo any structural modification; it suffices to modify the calculation parameters necessary to control the motors 34 which move the deflector to correct the errors measured on the screen of the tube.
  • the transducers 37 make it possible on the one hand to know the position of each socket 31 and on the other hand, to verify that a controlled movement has indeed been carried out.
  • Fixing the diverter on the tube once the adjustments have been made can, like the latter, be carried out without manual intervention, for example using automatic screwdrivers.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Color Television Image Signal Generators (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
  • Details Of Television Scanning (AREA)
EP84400761A 1983-04-26 1984-04-17 Vorrichtung zur räumlichen Einstellung einer Ablenkeinheit bei einer Fernsehröhre, insbesondere bei einer Farbfernsehröhre Expired EP0123613B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84400761T ATE35879T1 (de) 1983-04-26 1984-04-17 Vorrichtung zur raeumlichen einstellung einer ablenkeinheit bei einer fernsehroehre, insbesondere bei einer farbfernsehroehre.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8306834 1983-04-26
FR8306834A FR2545266B1 (fr) 1983-04-26 1983-04-26 Appareil pour le reglage de la position d'un deviateur sur un tube de television, notamment en couleurs

Publications (3)

Publication Number Publication Date
EP0123613A2 true EP0123613A2 (de) 1984-10-31
EP0123613A3 EP0123613A3 (en) 1986-03-26
EP0123613B1 EP0123613B1 (de) 1988-07-20

Family

ID=9288221

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84400761A Expired EP0123613B1 (de) 1983-04-26 1984-04-17 Vorrichtung zur räumlichen Einstellung einer Ablenkeinheit bei einer Fernsehröhre, insbesondere bei einer Farbfernsehröhre

Country Status (6)

Country Link
US (1) US4638219A (de)
EP (1) EP0123613B1 (de)
JP (1) JPS59207550A (de)
AT (1) ATE35879T1 (de)
DE (1) DE3472857D1 (de)
FR (1) FR2545266B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0219467A3 (de) * 1985-10-08 1987-12-16 Plessey S.p.A. Société dite: Vorrichtung zur Korrektur der durch die Montage der Ablenkvorrichtung auf die Bildröhre hervorgerufenen geometrischen Bildfehler
US4850921A (en) * 1985-12-04 1989-07-25 Hitachi, Ltd. Full automatic total inspection system for implosion-protected cathode-ray tube
US4925420A (en) * 1987-02-13 1990-05-15 Videocolor Method for the automatic measurement of convergence and for the determination of corrections to be made in trichromatic cathode tube deflectors and machine for the application of this method
US4971588A (en) * 1988-02-19 1990-11-20 Hitachi, Ltd. Position adjusting method for deflecting yoke

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4760457A (en) * 1986-04-30 1988-07-26 Rca Licensing Corporation Self-fixtured kinescope
FR2606550B1 (fr) * 1986-11-12 1989-01-13 Videocolor Procede et dispositif pour le reglage de la convergence statique et/ou de la purete d'un tube de television en couleurs
US5043823A (en) * 1990-06-22 1991-08-27 Hughes Aircraft Company Cathode ray tube focus coil alignment and assembly arrangement
TW333368U (en) * 1992-04-21 1998-06-01 Toshiba Co Ltd Image tube apparatus
IT1286905B1 (it) * 1996-12-20 1998-07-17 Spemac Srl Meccanismo automatico di piazzamento

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4834415B1 (de) * 1970-02-05 1973-10-20
US3950720A (en) * 1975-01-07 1976-04-13 Rca Corporation Adjustable spring mount for a cathode ray tube yoke
US4163308A (en) * 1977-06-24 1979-08-07 Hitachi, Ltd. Deflection yoke assembly positioning device
US4360839A (en) * 1980-04-21 1982-11-23 Rca Corporation Deflection yoke adjustment apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0219467A3 (de) * 1985-10-08 1987-12-16 Plessey S.p.A. Société dite: Vorrichtung zur Korrektur der durch die Montage der Ablenkvorrichtung auf die Bildröhre hervorgerufenen geometrischen Bildfehler
US4850921A (en) * 1985-12-04 1989-07-25 Hitachi, Ltd. Full automatic total inspection system for implosion-protected cathode-ray tube
US4925420A (en) * 1987-02-13 1990-05-15 Videocolor Method for the automatic measurement of convergence and for the determination of corrections to be made in trichromatic cathode tube deflectors and machine for the application of this method
US4971588A (en) * 1988-02-19 1990-11-20 Hitachi, Ltd. Position adjusting method for deflecting yoke

Also Published As

Publication number Publication date
DE3472857D1 (en) 1988-08-25
JPS59207550A (ja) 1984-11-24
EP0123613B1 (de) 1988-07-20
EP0123613A3 (en) 1986-03-26
FR2545266B1 (fr) 1985-12-27
US4638219A (en) 1987-01-20
FR2545266A1 (fr) 1984-11-02
ATE35879T1 (de) 1988-08-15

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