EP0326440B1 - Maschine zum Einbauen einer Kathode in eine Kanone einer Kathodenstrahlröhre - Google Patents

Maschine zum Einbauen einer Kathode in eine Kanone einer Kathodenstrahlröhre Download PDF

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Publication number
EP0326440B1
EP0326440B1 EP89400033A EP89400033A EP0326440B1 EP 0326440 B1 EP0326440 B1 EP 0326440B1 EP 89400033 A EP89400033 A EP 89400033A EP 89400033 A EP89400033 A EP 89400033A EP 0326440 B1 EP0326440 B1 EP 0326440B1
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EP
European Patent Office
Prior art keywords
gun
cathode
grid
axis
sensor
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
Application number
EP89400033A
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English (en)
French (fr)
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EP0326440A1 (de
Inventor
Daniel Cote
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.)
Thomson Tubes and Displays SA
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Thomson Tubes and Displays SA
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Publication date
Application filed by Thomson Tubes and Displays SA filed Critical Thomson Tubes and Displays SA
Publication of EP0326440A1 publication Critical patent/EP0326440A1/de
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Publication of EP0326440B1 publication Critical patent/EP0326440B1/de
Anticipated expiration legal-status Critical
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    • 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
    • H01J9/42—Measurement or testing during manufacture
    • 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
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/18—Assembling together the component parts of electrode systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2209/00—Apparatus and processes for manufacture of discharge tubes
    • H01J2209/18—Assembling together the component parts of the discharge tube
    • H01J2209/185—Machines therefor, e.g. electron gun assembling devices

Definitions

  • the present invention relates to cathode implantation machines in a cathode ray tube barrel, more particularly an improvement to the machine described in French patent application No. 87 03922 (EP-A-288 335, published on October 26, 1988) filed March 20, 1987 in the name of the plaintiff.
  • the machines currently used for inserting cathodes into the electronic cannon of a cathode ray tube comprise, for measuring the distance between the active face of the cathode and the grid G1 or, where appropriate, the grid G2, complex devices, not very rapid. , and with difficulty keeping the necessary precision.
  • the machines position the cathode relative to the first grid or grid G1 by first inserting a probe of fixed length between the cathode and the grid G1, the cathode being mounted on a fixed support and the barrel being mounted on a support.
  • mobile driven by a roller cooperating with the groove in cam profile of a parent screw itself driven by a stepping motor.
  • a first stage of this groove determines the position of measurement and of adjustment in position of the cathode, then the barrel is moved back, the probe released, and the barrel advanced by a distance equal to that from which it moved back, increased by the length of the probe.
  • the drive device constituted by a lead screw cooperating with a roller is imprecise: the groove of the lead screw must be free of any dust or debris, which is difficult to obtain in an industrial environment.
  • the coupling device with the lead screw which drives it has games that are difficult to take into account.
  • the feeler may deform the grommet, or else the feeler must be made of deformable material.
  • the retractable rod probe is inserted between the barrel and the cathode.
  • the probe rod is then brought into abutment against the grid G1 and one can thus determine the distance between the probe and the active face of the cathode.
  • the active face of the cathode is positioned so that, when the probe is removed and the barrel support device is brought into its second fixed position, the desired distance between the active face of the cathode and the grid is obtained. G1.
  • This machine for implanting a cathode in the eyelet of an electronic gun therefore allows exact positioning of the cathode relative to the grid G1, however it does not take into account the positioning of the grid G2 nor the spacing between grid G1 and grid G2.
  • the distance between the grids G1 and G2 must be between specific values so as to obtain a precise cut-off.
  • the object of the present invention is to remedy these drawbacks by proposing a cathode implantation machine in a grommet of a cathode-ray tube making it possible to carry out in a single measurement the position of the grid G1, of the grid G2 and of the cathode.
  • the subject of the present invention is a cathode implantation machine in a cathode ray tube cannon eyelet of the type comprising a support device for the movable barrel along the axis of the barrel, a cathode support device positioning the cathode according to the axis of the barrel and a probe with retractable rod cooperating with a first detector giving the position of the cathode when the rod is in abutment on the grid G1, said probe being movable perpendicular to the axis of the barrel, characterized in that it comprises in addition a calibrated length rod coming to bear on the grid G2 and emerging on the side opposite to the eyelet, a second detector recording the position of the rod and a control device determining from the measurements made by the two detectors, the displacement of the barrel support device.
  • the first detector is constituted by an electromagnetic sensor while the second detector is constituted by a sensor with optical aiming developing a measurement signal.
  • the probe is mounted axially movable at the end of an L-shaped arm carrying at its other end the second detector, said arm being displaceable perpendicular to the barrel / cathode axis.
  • the cathode support device is fixed along the axis of the barrel but movable substantially perpendicular to the axis of the barrel.
  • the probe with retractable rod is preferably produced as described in French patent application No. 87 03922.
  • the probe has a cylinder in which a piston moves on which is fixed a probe rod opening at one end of the probe. cylinder and intended to come into contact with the grid G1 of the barrel, the other end of the cylinder comprising a detector detecting, when the probe is arranged in the axis of the barrel and that the piston is in abutment against the end by which leaves the rod, the position of the active face of the cathode also positioned in the axis of the barrel.
  • FR-A-2 205 738 describes a cathode implantation machine in a cathode ray tube barrel eyelet comprising a support device for the movable barrel along the axis of the barrel, a cathode support device positioning the cathode along the axis of the barrel and a retractable rod probe cooperating with a first detector giving the position of the cathode when the rod is in contact with the grid G1, the probe being movable perpendicular to the axis of the barrel.
  • G1-G2 compensating cathode inserter describes a cathode insertion device in which account is taken of the spacing between grid G1 and grid G2 for the exact positioning of the cathode relative to to grid G1.
  • a probe is introduced into the openings of the grids G1 and G2.
  • FIG. 1 represents a simple gun, it is understood that, for a person skilled in the art, the invention can also be applied to a triple gun for trichrome cathode ray tube.
  • FIG. 1 a schematic view of an implantation machine according to the present invention.
  • This machine includes an electron gun support device 1 for a cathode ray tube movable along an axis 2, a probe 4 with retractable rod, a cathode support device 5, a calibrated rod 7, position detectors 8 and 9 and a control device 10 determining from the measurements made by the two detectors the displacement of the gun support device.
  • the barrel 3 of the cathode-ray tube used in the embodiment shown in FIG. 1 is made up of four grids referenced G1, G2, G3 and G4 fixed on two ceramic pieces 11, 12, generally called “beading". It is understood that the invention can be applied to cannons comprising a different number of grids, in particular to cannons with six grids.
  • the barrel 3 also includes an eyelet 13 for the cathode.
  • the machine of the invention is used to introduce the cathode 6 into the eyelet 13 so that the anterior face 6a of the cathode, that is to say the face on which the emissive substance is applied, is located a determined distance from grid G1. Once the cathode is positioned, it is then welded into the eyelet 13.
  • the cathode 6 is mounted on a support device 5 which is fixed according to axis 2 but mobile substantially perpendicular to axis 2 to be able to position the cathode along this axis.
  • the barrel is deposited on a support device 1 movable parallel to the axis 2.
  • the barrel support device consists of a sleeve 14 of outside diameter slightly less than the diameter of the electron passage holes of the grids G3 and G4 provided with one of its ends of a flange 15.
  • the flange 15 is integral with a movable bearing 16 moving on a fixed guide 17 and parallel to the axis 2.
  • the bearing 16 is driven by a motor not shown.
  • the generally cylindrical feeler 4 is mounted at the end of a support arm 18 movable perpendicular to the axis 2 between a measurement position for which the feeler axis coincides with the axis 2 as shown in the figure 1 and a release position.
  • the arm 18 is slidably supported by a U-shaped arm 19 carrying at its two ends sleeves 20 and 20 ′ positioned between two stops 21 and 21 ′ secured to the arm 18 with interposition of a spring 22 between the sleeve 20 and the stop 21.
  • the arm 19 can be moved perpendicular to the axis 2 using a spring device 23 or other similar device.
  • the probe 4 essentially comprises a retractable measuring rod 24 driven by a piston 25 moving in the chamber formed by the cylindrical body 26 of the probe.
  • the probe further comprises at its other end a detector device 9 facing, in the measurement position, the active surface 6a of the cathode 6. In the release position, the measurement rod 24 of the probe is retracted.
  • the probe 4 arrives in the measurement position, its rod is extended to come into contact with the first grid G1 of the barrel 3.
  • the probe used in the context of the present invention may be identical to the probe described in French patent application No. 87 03922. This probe is shown in detail in Figure 2. In this figure the probe is shown in the measurement position .
  • the feeler device described here is of the control type pneumatic, but it is obvious to a person skilled in the art that the invention is not limited to such a probe and that any probe fulfilling the same function, namely using a retractable rod for measuring the distance between the first grid of the barrel and the cathode, may be suitable.
  • Such probes can be electromagnetic, hydraulic, etc.
  • the body 26 of the probe 4 is mounted movable in axial translation relative to the support arm 18 by means of a ball bearing 27. This translation is limited on one side by a shoulder 28 of the body 26 and on the other side by a spring with flange 29 disposed around the body 26 and pressing against a cap ring 30 screwed to the end of the body 26.
  • the cap ring 30 allows the rod 24 to pass in leaktight manner and acts as an adjustable stop for the piston 25.
  • the other end of the body 26 is closed.
  • a coil spring 31 is disposed inside the body 26 pressing against the closed end and prevents the piston 25 from abutting too abruptly against this end in its withdrawal movement.
  • the body 26 of the probe is pierced, near the end on which the spring 31 is supported, with a radial hole 32 connected to a pneumatic control device not shown.
  • the closed end of the body 26 has a cavity 33 in which is mounted a detector, namely an electromagnetic sensor 9 used to determine the distance 6a-G1.
  • the sensor 9 will determine the penetration of the rod 9a urged by the spring 9b against the front face 6a of the cathode.
  • This type of detector is known per se and will not be described in more detail.
  • Other types of detectors can be used, in particular devices of the type described in patent application FR-87 03922.
  • the piston 25 abuts against the cap 30, its rod 24 being in abutment against the first grid G1 of the barrel 3.
  • the probe When the probe is in the position shown in FIG. 1 with its rod 24 resting against the grid G1, it constitutes a calibrated rod and thus allows the determination of the distance of the cathode relative to the grid G1 by using the electromagnetic sensor 9.
  • the information coming from the sensor 9 is sent to the control device 10 which develops a command positioning the stop 41.
  • the probe is actuated by a control device which may be of the type described in French patent application No. 87 03922. Consequently, this pneumatic type control device will not be described again here.
  • a rod 7 whose diameter is less than the internal diameter of the sleeve 14 and whose length is greater than the distance between G2 and the end of the barrel on the side of the grids G4 or G6, is movable along axis 2.
  • the rod 7 is preferably introduced into the barrel when the sleeve 14 is itself introduced into the barrel, the flange 15 being in abutment against the beading 12.
  • This rod 7 is actuated by a mechanism appropriate automatic (not shown).
  • a spring 40 or similar device then applies the rod against the grid G2.
  • a position detector 8 for example an optical sighting sensor producing an electrical measurement signal, determines the position of the free front face 7a of the rod 7.
  • the electrical measurement signal is sent to a control and display device 10 which also receives the signal emitted by the detector 9.
  • the detector 8 is placed at the end of the arm 18 opposite the end supporting the probe 4. It determines the position of the face 7a of the rod 7 when the barrel 3 is in the retracted position P1 as shown in FIG. 1, so as to allow the introduction of the probe 4 into the measurement position.
  • the detector 8 and the probe 4 are arranged at each end of the same arm 18, the two detectors 8 and 9 will therefore be in position aligned along the axis 2.
  • the electrical signals produced by the detectors 8 and 9 are sent to a control and display device 10 which determines from these signals the value of the displacement of the stop 41.
  • This stop 41 in fact determines the final position of the support device barrel, position for which cathode 6 occupies its normal position in the eyelet 13, that is to say when the face 6a of the cathode is at the desired distance from the grid G1.
  • the control device 10 sends a control signal to the motor 42 which moves the stop.
  • the standard position of the abutment is first determined for a barrel and a reference cathode which will have been measured and chosen beforehand.
  • the standard distance Y of displacement of the barrel support device is thus obtained, which gives the standard position of the stop.
  • the detectors 8 and 9 measure deviations X1 and X2 respectively from the measurements previously made with the reference elements. These deviations can be positive or negative and determine the variation of the stop position.
  • the detectors 8 and 9 take into account the variations in distance between the grid G1 and the grid G2 and allow positioning of the cathode relative to the grid G1 which corresponds to a value determined in advance.
  • the machine of the invention further comprises a device for welding the cathode 6 in the eyelet 13, for example a device for welding by laser beam, this welding device is well known per se and does not form part of the the invention will not be re-described.

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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)

Claims (7)

  1. Maschine zum Einsetzen einer Kathode (6) in die Öse (13) des Strahlerzeugers (3) einer Fernsehbildröhre mit mindestens einem ersten Gitter (G1) und einem zweiten Gitter (G2), wobei die Maschine selbst folgende Teile umfaßt:
    - eine Haltevorrichtung (1) des Strahlerzeugers, die parallel zur Achse (2) desselben zwischen einer Rückstellung, in welcher der Strahlerzeuger in Bezug auf die Kathode zurückgestellt ist, und einer Endstellung, in welcher die Kathode ihre normale Lage in der Öse eingenommen hat, verschiebbar ist;
    - eine Haltevorrichtung (5) der Kathode, welche längs der Achse des Strahlerzeugers angeordnet ist und die Kathode auf derselben positioniert, wobei besagte Haltevorrichtung außerdem senkrecht zur Achse des Strahlerzeugers beweglich ist;
    - einen Fühler (4), der senkrecht zur Achse des Strahlerzeugers zwischen einer Meßstellung, in welcher die Fühlerachse mit der Achse des Strahlerzeugers übereinstimmt, und einer Ruhestellung verschiebbar ist,
    wobei der Fühler (4) an einem Ende einen ausfahrbaren Meßstift (24) aufweist, welcher in Meßstellung das Gitter berührt, jedoch nicht in dieses eindringt und welcher in Ruhestellung zurückgefahren ist, während am anderen Ende des Fühlers ein erster Detektor (9) vorgesehen ist, welcher die emittierende Fläche (6a) der Kathode abtastet;
    - einen Meßstab (7) mit geeichter Länge, welcher das zweite Gitter berührt, jedoch nicht in dieses eindringt und welcher sich in Richtung seiner Stirnfläche (7a) ausstreckt, wobei er sich von der Öse entfernt;
    - einen zweiten Detektor (8), welcher die Position der Stirnfläche des Meßstabes (7) ermittelt, wenn sich die Haltevorrichtung des Strahlerzeugers in Rückstellung befindet, und
    - eine Steuereinrichtung (10), welche die vom ersten und zweiten Detektor (9, 8) abgegebenen Signale empfängt und mit deren Hilfe die Endstellung der Haltevorrichtung des Strahlerzeugers bestimmt, in welcher die emittierende Fläche der Kathode im geforderten Abstand zum ersten Gitter liegt.
  2. Maschine nach Anspruch 1, dadurch gekennzeichnet, daß der erste Detektor (9) eine elektromagnetische Sonde (9) ist.
  3. Maschine nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß der zweite Detektor eine optische Peilsonde (8) ist, welche ein Signal erzeugt.
  4. Maschine nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Fühler (4) an einem Ende eines L-förmigen Armes (18) in axialer Richtung beweglich angeordnet ist, und daß der zweite Detektor (8) am anderen Ende des Armes (18) angebracht ist, wobei der Arm selbst senkrecht zur Achse des Strahlerzeugers verschiebbar ist.
  5. Maschine nach einem der Ansprüche 1 bis 4, dadruch gekennzeichnet, daß die Haltevorrichtung (1) des Strahlerzeugers eine Muffe (14) aufweist, deren Durchmesser kleiner ist als der Innendurchmesser der Öffnungen der Gitter mit Ausnahme der beiden ersten Gitter, daß besagte Muffe einen Flansch (15) aufweist, welcher an den "Perlen" (11, 12) anliegt, wenn die Muffe vollständig in den Strahlerzeuger eingeführt ist, und daß die Muffe mit einer Steuereinrichtung (16, 17), welche die Bewegung der Haltevorrichtung des Strahlerzeugers steuert, fest verbunden ist.
  6. Maschine nach einem der Ansprüche 1 bis 5, dadruch gekennzeichnet, daß der Fühler einen Zylinder (26) aufweist, in welchem sich ein Kolben (25) bewegt, an dem ein Meßstift (24) befestigt ist, welcher an einem Ende des Zylinders austritt und dabei das erste Gitter G1 des Strahlerzeugers berühren muß, während am anderen Ende der zweite Detektor (9) vorgesehen ist, welcher die Position in Bezug auf die aktive Fläche der in der Achse des Strahlerzeugers liegenden Kathode ermittelt, wenn der Fühler in Achsrichtung des Strahlerzeugers liegt und sich der Kolben an dem Ende, an welchem der Meßstift austritt, in Anschlag befindet.
  7. Maschine nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Weglänge der Haltevorrichtung (1) des Strahlerzeugers durch einen über die Steuereinrichtung (10) verstellbaren Anschlag (41) begrenzt wird.
EP89400033A 1988-01-13 1989-01-05 Maschine zum Einbauen einer Kathode in eine Kanone einer Kathodenstrahlröhre Expired - Lifetime EP0326440B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8800295A FR2625837B1 (fr) 1988-01-13 1988-01-13 Perfectionnement aux machines d'implantation de cathode dans un canon de tube cathodique
FR8800295 1988-01-13

Publications (2)

Publication Number Publication Date
EP0326440A1 EP0326440A1 (de) 1989-08-02
EP0326440B1 true EP0326440B1 (de) 1995-10-25

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Application Number Title Priority Date Filing Date
EP89400033A Expired - Lifetime EP0326440B1 (de) 1988-01-13 1989-01-05 Maschine zum Einbauen einer Kathode in eine Kanone einer Kathodenstrahlröhre

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US (1) US4898559A (de)
EP (1) EP0326440B1 (de)
JP (1) JP2770363B2 (de)
DE (1) DE68924608T2 (de)
FR (1) FR2625837B1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5295887A (en) * 1993-06-16 1994-03-22 Zenith Electronics Corporation K-G1 electrode spacing system for a CRT electron gun
JP3338275B2 (ja) * 1996-02-28 2002-10-28 三菱電機株式会社 電子銃組立装置および電子銃組立方法
JPH10188800A (ja) * 1996-12-27 1998-07-21 Sony Corp 電子銃の組立方法及び組立装置

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3584182A (en) * 1969-05-29 1971-06-08 Griffiths Electronics Inc Method and apparatus for precision loading and welding of components in an electron device
US3848301A (en) * 1972-11-06 1974-11-19 Rca Corp Method of directly spacing a cathode-to-grid assembly for a cathode-ray tube
US4015315A (en) * 1975-07-14 1977-04-05 Rca Corporation Method of setting cathode-G1 spacing
JPS52125266A (en) * 1976-04-14 1977-10-20 Nec Corp Cathode constant length welder unit in cathode ray tube
DE3109056A1 (de) * 1980-03-14 1981-12-24 Videocolor GmbH, 7900 Ulm Verfahren zum herstellen einer elektrodenanordnung fuer kathodenstrahlroehren
JPS57196446A (en) * 1981-05-27 1982-12-02 Toshiba Corp Assembling device for electrodes of cathode-ray tube
JPS61230232A (ja) * 1985-04-03 1986-10-14 Sanyo Electric Co Ltd 電子銃組立装置
FR2592219B1 (fr) * 1985-12-23 1988-02-12 Videocolor Dispositif de controle automatique simultane de la distance entre cathodes et deuxieme grille d'un canon de tube cathodique trichrome

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
R.C.A. TECHNICAL NOTES, no. 1322, 22 décembre 1982, pages 1,2, Princeton, New Jersey, US; R.E. SCHLACK et al.: "G1-G2 compensating cathode inserter" *

Also Published As

Publication number Publication date
JPH01209629A (ja) 1989-08-23
FR2625837B1 (fr) 1990-11-09
US4898559A (en) 1990-02-06
DE68924608D1 (de) 1995-11-30
DE68924608T2 (de) 1996-07-18
JP2770363B2 (ja) 1998-07-02
EP0326440A1 (de) 1989-08-02
FR2625837A1 (fr) 1989-07-13

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