EP0005567B1 - Verfahren zur Herstellung einer Farbfernsehbildröhre - Google Patents

Verfahren zur Herstellung einer Farbfernsehbildröhre Download PDF

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Publication number
EP0005567B1
EP0005567B1 EP79200214A EP79200214A EP0005567B1 EP 0005567 B1 EP0005567 B1 EP 0005567B1 EP 79200214 A EP79200214 A EP 79200214A EP 79200214 A EP79200214 A EP 79200214A EP 0005567 B1 EP0005567 B1 EP 0005567B1
Authority
EP
European Patent Office
Prior art keywords
selection electrode
supporting frame
face plate
electromagnets
parts
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
Application number
EP79200214A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0005567A3 (en
EP0005567A2 (de
Inventor
Hubert Dr. Göddecke
Werner Dr. Reichardt
Kurt Schumacher
Rainer Töpfer
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.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Patentverwaltung GmbH
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Patentverwaltung GmbH, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Patentverwaltung GmbH
Publication of EP0005567A2 publication Critical patent/EP0005567A2/de
Publication of EP0005567A3 publication Critical patent/EP0005567A3/de
Application granted granted Critical
Publication of EP0005567B1 publication Critical patent/EP0005567B1/de
Expired legal-status Critical Current

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Classifications

    • 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
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/06—Screens for shielding; Masks interposed in the electron stream
    • H01J29/07—Shadow masks for colour television tubes
    • H01J29/073—Mounting arrangements associated with shadow masks

Definitions

  • the invention relates to a method for producing a color television tube provided with a color selection electrode, in which a support frame of a color selection electrode to be clipped or a finished color selection electrode is inserted into the front glass in at least one process step, with at least three spikes anchored in the front glass with holders for mutual positioning interact on the support frame or on the color selection electrode.
  • one of the most critical process steps is to maintain the distance of the color selection electrode from the front glass during the manufacturing process with very low tolerances.
  • the so-called south point is determined, i.e. that is, the finished color selection electrode is latched in a corresponding device from above into the front glass at three points with the holders and then mostly pressed down by hand so that it engages. A distance can then already be determined in this position.
  • the south point is determined in a special process step in that a holding plate is welded into the front glass for the fourth holder in the locked state of the color selection electrode. This additional welding gives the color selection electrode greater mechanical stability.
  • Vibrating tables e.g. B. for the determination of loose contacts in the manufacture of electronic circuits, or vibrating conveyor known, for. B. in the manufacture of electronic components for strapping.
  • shaking of the tube bulb is also known, in order to shake loose parts out of the mask area so that they cannot interfere in the reproduced image, the loose parts being able to appear in the form of weld spatter, glass splinters or organic substances all of which, when they lie in front of the slot in the color selection electrode, cause a distinct shadow or color distortion on the screen during the operation of the color television picture tube, so that such a tube is unsalable if the parts could not be removed by shaking.
  • Tubes with color purity errors which are caused by the above-mentioned less than 100 percent adjustment in the various process steps, are difficult to correct later.
  • the object of the invention was therefore to provide a method with which the front glass and color selection electrode can be quickly and reliably brought into a reproducible mutual target position during the production of a color television picture tube.
  • a periodically changing magnetic field is applied to these parts in a method for producing a color television picture tube of the type mentioned according to the invention as an adjustment aid when inserting the magnetic parts mentioned, in order to shake them into a reproducible mutual desired position .
  • the invention is therefore u. a. to introduce additional procedural steps at the relevant points in the procedures indicated at the beginning, d. H. to allow a changing magnetic field to take effect, causing the parts to vibrate. By such a shaking the parts reach a defined end position, so that a reliable further assembly can then take place in the next process step, with the result that the position of the parts becomes independent of the worker on the machine or device concerned when adjusting and that a narrowing of the tolerances is also possible.
  • a method according to the invention is characterized in that for adjusting the support frame with its holders in the front glass and the mask plate relative to the support frame in the manufacture of the color selection electrode outside the front glass, an electromagnet excited with alternating current is arranged in the middle of the long side of the support frame in such a way that that the magnetic vibrating field generated by the electromagnet brings the parts into their final position in about 5 seconds.
  • Another method according to the invention is that for adjusting the color selection electrode at three points before attaching the holding plate for the holder at the south point, two electromagnets excited with alternating current are arranged in the vicinity of the corners of the supporting frame outside the upstanding edge of the front glass in such a way that the magnetic vibrating field generated by the electromagnets brings the parts into their final position in about 5 seconds.
  • a method according to the invention can be characterized in that for adjusting the color selection electrode with four holders before the individual exposures during so-called flow coating, at least two electromagnets excited with alternating current outside the front glass on the spherical part of the same near the raised edge and in the vicinity the corners of at least one side of the front glass or the support frame are arranged such that the magnetic vibrating field generated by the electromagnet brings the parts into their final position in about 5 seconds.
  • at least two electromagnets can be arranged on the open side of the front glass below the support frame.
  • the electromagnets are preferably excited with an alternating current of approximately 50 Hz.
  • 1 denotes the raised edge of the front glass of a color television picture tube.
  • the suspension points for a support frame 3 with mask plate 4 of a color selection electrode are designated by 2
  • this color selection electrode which is provided overall with the reference number 5
  • the front glass must therefore be inserted so that the open side is at the top.
  • the three holders are engaged at 2, and so that the inserted support frame 3 engages with its holders at 2, and the mask plate finds its correct position, the electromagnet 16 is switched on. He exerts a pull on the supporting frame via the magnetic field.
  • the field lines of the electromagnet 16 emerge from the poles labeled N and S approximately vertically, as indicated at 8, then run to the support frame and close in it. If the electromagnet 16 is connected to the AC network at 50 Hz, then the support frame vibrates at 100 Hz and thus the holder is shaken up onto the mandrels and without the help of a worker the final position is reached after about 5 seconds. At the same time, the mask sheet 4 is shaken into its non-energized rest position. Only then will the machine release welding for the mask sheet 4.
  • the automatic welding takes place at 14 (FIG. 2) on the circumference at the overlapping regions of the bent edge from the mask plate 13 to the opposite part of the support frame 12.
  • Such a holder is schematically drawn out again in FIG. 2 for clarification.
  • 2 shows part of the raised edge of the front glass at 9 on the left.
  • 10 is the metallic mandrel inserted into the glass, on which the holder 11 rests.
  • This holder is welded to the support frame 12 of the color selection electrode and carries at one end a bore which is pushed over the conical part of the mandrel.
  • the support frame 12 can be thick-walled than the mask plate. He doesn't need it for so-called frameless masks.
  • the sheet 12 It is customary to provide the sheet 12 with beads and thereby to lead the same sheet thickness from the mask sheet 13 to the frame 12, which is very favorable for thermal reasons.
  • the connection between the support frame 12 and the mask plate 13 takes place at 14. It is easy to see that to produce the connections 14, which are up to 10 spot welds on the circumference for a 67 cm color television picture tube, the support frame 12 with his holder 11 must initially rest properly on the mandrel 10, in a final position. Then the sheet 13 must rest correctly on the support frame 12 or on the raised edge 12 of the color selection electrode in order to carry out the welding at 14 in the correct assignment of the parts.
  • the electromagnet 16 is switched on in a certain process stage and then shakes, the 100 Hz vibration being able to last for about 5 seconds. Then the parts have reached their correct position and the next process step can take place.
  • FIG. 4 shows a further arrangement in an even later process stage.
  • the view of the front glass 1 is shown, namely on the spherical part on which the screen is deposited on the inside.
  • flow coating is carried out in three exposure steps, because the colors red, green and blue have to be applied in separate steps in succession, the light source having to assume different positions for exposure.
  • the color selection electrode 5 must be removed from the front glass each time during the treatment. They. is unhooked on the holders 2 and before the next exposure step snapped back into place, again pressing the mask into the holder correctly by hand.
  • FIG. 6 finally shows an example of a circuit arrangement.
  • the AC network with 220 V50 Hz can be connected to terminals 21 and 22.
  • a setting transformer 23 has outputs which lead to the electromagnets 6 and 7 via the rectifiers 24 and 25. These are excited in phase opposition and thereby pull the sheet metal or the ferromagnetic iron of the support frame towards them, and this in cycles of 50 Hz, so that the parts vibrate and are shaken into the correct position by the fine vibration.

Landscapes

  • Electrodes For Cathode-Ray Tubes (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
EP79200214A 1978-05-22 1979-05-03 Verfahren zur Herstellung einer Farbfernsehbildröhre Expired EP0005567B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2822345A DE2822345C3 (de) 1978-05-22 1978-05-22 Verfahren zum Einsetzen einer Farbauswahlelektrode in eine Farbfernsehbildröhre
DE2822345 1978-05-22

Publications (3)

Publication Number Publication Date
EP0005567A2 EP0005567A2 (de) 1979-11-28
EP0005567A3 EP0005567A3 (en) 1979-12-12
EP0005567B1 true EP0005567B1 (de) 1982-05-12

Family

ID=6039962

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79200214A Expired EP0005567B1 (de) 1978-05-22 1979-05-03 Verfahren zur Herstellung einer Farbfernsehbildröhre

Country Status (4)

Country Link
EP (1) EP0005567B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS54155760A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CA (1) CA1145813A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (2) DE2822345C3 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2471040A1 (fr) * 1979-12-04 1981-06-12 Videocolor Procede, machine et dispositif pour l'automatisation des operations d'assemblage et de desassemblage d'un masque a l'interieur de la dalle-ecran lors de la fabrication d'un tube de television en couleurs
DE3540494A1 (de) 1985-11-15 1987-05-21 Phoenix Ag Dichtungsprofil fuer segmente von tunnelroehren

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6614551A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1966-10-15 1968-04-16

Also Published As

Publication number Publication date
DE2962778D1 (en) 1982-07-01
EP0005567A3 (en) 1979-12-12
DE2822345A1 (de) 1979-11-29
JPS54155760A (en) 1979-12-08
DE2822345C3 (de) 1981-01-22
CA1145813A (en) 1983-05-03
EP0005567A2 (de) 1979-11-28
DE2822345B2 (de) 1980-04-17
JPS6131937B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1986-07-23

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