EP0230827B1 - Dispositif de contrôle automatique simultané de la distance entre cathodes et deuxième grille d'un canon de tube cathodique trichrome - Google Patents

Dispositif de contrôle automatique simultané de la distance entre cathodes et deuxième grille d'un canon de tube cathodique trichrome Download PDF

Info

Publication number
EP0230827B1
EP0230827B1 EP86402860A EP86402860A EP0230827B1 EP 0230827 B1 EP0230827 B1 EP 0230827B1 EP 86402860 A EP86402860 A EP 86402860A EP 86402860 A EP86402860 A EP 86402860A EP 0230827 B1 EP0230827 B1 EP 0230827B1
Authority
EP
European Patent Office
Prior art keywords
sleeve
control
tracing
grid
cathodes
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
EP86402860A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0230827A1 (fr
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.)
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
Publication of EP0230827A1 publication Critical patent/EP0230827A1/fr
Application granted granted Critical
Publication of EP0230827B1 publication Critical patent/EP0230827B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • H01J9/42—Measurement or testing during manufacture

Definitions

  • the present invention relates to a device for automatic simultaneous control of the distance between cathodes and second grid of a trichrome cathode ray tube barrel.
  • this distance is indirectly determined by measuring the distance between each cathode and the second grid (G2), access to this second grid being possible through the other grids, the distance between G1 and G2 being estimated.
  • the devices usually used for this purpose are bulky, and therefore do not allow simultaneous measurement for the three cathodes, and their implementation in an automated measurement process does not guarantee any risk of impact on the cathode or on grid G2.
  • the present invention relates to a device allowing the simultaneous automatic control of the distance of each of the three cathodes to the grid G2, device ensuring a very soft bringing of the measuring elements in contact with the cathodes and G2, while carrying out a very controlled fast and precise.
  • the device for automatic simultaneous control of the distance between cathodes and second grid of a trichrome cathode ray tube barrel of the type with control element comprising a sleeve coming into contact with the second grid, in which a feeler rod coming into contact with the cathode
  • the device comprising, fixed on a common frame three control elements each comprising a hollow cylindrical guide enclosing a coaxial sleeve which can move with the minimum of friction in the guide, a feeler rod moving with minimum friction in the sleeve and being integral with the core of an electronic displacement sensor whose body is integral with the sleeve.
  • the device of the invention is qualified as a control device, because it is generally used to check whether the distances between cathodes and grid G2 of each gun of a series of guns which have just been assembled are included within determined limits, the out-of-bounds distances causing cannons to be scrapped.
  • this device can also be used to measure the individual absolute values of these distances, for example to follow the evolution or the statistical distribution of a manufacturing series.
  • the device of the invention comprises a frame 1 on which are fixed three identical control elements 2, 3 and 4 allowing the cathode-G2 distance checks to be carried out for cathodes 5, 6, 7 respectively (not shown in detail) of an electron gun, these cathodes producing the electron beams relating to the colors red, green and blue respectively.
  • These three cathodes can be aligned or not. In the present case, the most usual, these cathodes are aligned, that is to say that their longitudinal axes are parallel and coplanar.
  • the axes of elements 2 to 4 are arranged in the same way as those of cathodes 5 to 7.
  • the centers of elements 2 to 4 are equal to those of cathodes 5 to 7.
  • Elements 2 to 4 being identical, we will not describe here below in detail as item 2.
  • the element 2 of generally tubular cylindrical shape, comprises a hollow cylindrical outer guide 8, the rear part 9, of larger diameter than the front part, is fixed in a corresponding counterbore of the frame 1.
  • This rear part 9 of the guide 8 is supported on the bottom of the counterbore in which it is fixed.
  • the front part 10 of the element 2, which projects from the frame 1, has an outside diameter slightly less than the diameter of the orifices made in grids G3 to G6 for the passage of the electron beam.
  • the length of the part 10 is such that when the frame 1 is in contact with or very close to G6, the free end of this part 10 arrives substantially flush with G3, on the G2 side.
  • a floating sleeve 11 Inside the guide 8, there is a floating sleeve 11, also of generally hollow circular cylindrical shape. This sleeve 11 can move axially practically without friction inside the guide 8, thanks to two ball cages 12, 13 respectively, arranged coaxially in the rear part 9 and in the front part 10 of the guide 8, between the internal face of the guide and the external face of the sleeve.
  • the sleeve 11 projects from the front front face of the guide 8 by a length greater than the maximum possible distance between the facing faces of G2 and G3.
  • the sleeve 11 comprises a rear part 14, also tubular and cylindrical, of larger internal diameter than the front part, this part 14 freely passing through an opening 15 formed in the bottom of the counterbore in which the rear part 9 of the guide 8 is fixed.
  • This rear part is in the form of a cylindrical tube closed at its end, with the exception of a small opening 14 A.
  • the sleeve 11 has on its external surface an annular flange 16 whose external diameter is slightly less than the internal diameter of part 9 of the guide, this flange being situated between the ball cage 12 and the bottom of the counterbore in which part 9 is fixed; to allow to have a helical spring 17 between this flange and the bottom of the counterbore, this spring urging the sleeve 11 forward (towards the cathode 5, the device being in the control position), without however the flange 16 coming in thrust against the ball cage 12 in the control position.
  • a feeler rod 18 is housed in the sleeve 11.
  • the diameter of this rod is slightly less than the inside diameter of the front part of the sleeve, so that it can slide there freely.
  • the rod 18 comprises near its rear end, approximately at the middle of the part 14, a flange 20 forming a piston in the cylinder formed by the part 14, without however this piston rubbing against the walls of the cylinder. A little beyond the piston 20, the end of the rod 20 is connected at the end to the cylindrical core 21 of a displacement sensor 22, disposed in the axis of the Element 2, the body 23 of which is fixed to the inside of the sleeve 14.
  • the core 21 is connected at its rear end to a short rod 24 ending in a plate, a spring 25 pressing on the one hand against this plate and on the other hand against the posterior front face closed of the sleeve 14, this spring urging the rod 18, core 21 and rod 24 assembly forward.
  • a compressed air supply 26 is fixed to the wall of the part 14 of the sleeve 11, at the front of the piston 20 (sufficiently at the front so that the piston does not exceed it in the extended position of the rod 18), this inlet opening into the cylinder formed by the part 14 and being connected to a source of compressed air (not shown).
  • the pressure exerted by the compressed air coming from this source must be able to overcome the opposite pressure of the spring 25 and urge the rod 18 rearward, despite the leaks occurring at the piston 20 and at the outlet of the front part of the sleeve 11; means for sealing these leaks being prohibited since, as stated above, the rod 18 must be able to move with the minimum of friction inside the sleeve 11.
  • this pneumatic actuation system can be replaced by an electromagnet urging the rod 18 towards the rear.
  • the frame 1 comprises a protruding arm 27, extending parallel to the axes of the elements 2 to 5, towards the front, substantially up to the level of the front front faces of the guides of these elements.
  • a precision contactor 28 is fixed, the feeler 29 of which extends, substantially perpendicular to the axes of the elements 2 to 4, in the direction of these elements, so as to come into contact with the grid G2, side G3, when the frame of the control device is in place, that is to say when the elements 2 to 4 have been introduced into the corresponding orifices of the grids G6 to G3, the front faces of the guides of these elements arriving flush with the face of G3 which is opposite G2.
  • the front front faces of the three sleeves are then supported on the face of G2 which is opposite G3, and the three probing rods are held in the retracted position in the corresponding sleeves, of which they do not protrude, under the effect of the pressure exerted by compressed air on the three pistons (the piston 20 and the homologous pistons of elements 3 and 4) of the probing rods.
  • a device not shown
  • the three feeler rods come gently, under the action of their springs (spring 25 and counterparts), to the contact of the active faces of cathodes 5 to 7.
  • the sleeve of the central element 3 is made in one piece with its guide, that is to say that it is fixed relative to the frame 1, the contactor 28 is triggered when the front face of the sleeve of this central element comes into contact with G2.
  • the elements allowing the axial mobility of the sleeve are eliminated, that is to say the corresponding ball cages and the spring.
  • FIG 2 there is shown in a simplified manner, in addition to the grids and the cathodes of the barrel subjected to the control, the sleeves 11, 30 and 31 of the three control elements 2,3,4 respectively, their probing rods 18,32 , 33 respectively, and their displacement sensors 22, 34 and 35 respectively, as well as the spring 17 of the sleeve 11 and the springs 36 of the sleeve 31, the sleeve 30 not needing a spring for this variant. It is understood that the reasoning is valid if element 3 is identical to elements 2 and 4, provided that account is taken of the fact that the sleeve of this element is then mobile.
  • each sensor provides the absolute value of the corresponding cathode -G2 distance (or, more simply, makes it possible to determine / by a response and all or nothing if this distance is indeed within a determined range or not).
  • These measurements or controls are carried out simultaneously, when the ends of the probing rods 18, 32, 33 are well in contact with the corresponding cathodes.
  • These measurements or controls can be triggered by the closing of the contactor 28, after a slight delay, necessary to allow the probing rods to come out of their sleeves and come into contact with the cathodes. It is thus possible to easily and safely automate the measurement or the control, the probing rods leaving their sleeves only when the control device is properly in place relative to the barrel.
  • FIG. 3 shows an advantageous variant of the control device according to the invention, a variant for which the entire measuring probe is moved, that is to say the probe rod with its floating sleeve, instead of move only the rod (rod 18 in Figure 1), which provides additional advantages explained below.
  • the control device of FIG. 3 essentially comprises three identical measuring elements, 36,37,38. Only one of these elements will be described in detail, the element 36.
  • This element 36 comprises an outer sleeve 39 whose outer diameter is less than the diameter of the orifices of the grids G3 and G6.
  • a floating sleeve 40 can move axially practically without friction inside the sleeve 39 thanks to two ball cages 40,42 arranged coaxially inside the rear ends (the one opposite to the grid G1 in the measurement position) by a part 43 larger inside and outside diameters than those of its body.
  • a rod-shaped probe 44 moves axially with very gentle friction inside the sleeve 40.
  • the probe 44 has approximately the same length as the sleeve 40 (including its end 43).
  • a disc 45, moving inside the end 43, is fixed on the probe 44.
  • the location relative to the probe 44 of the disc 45 is determined in such a way that when the disc is in abutment against the bottom 46 of the end 43 the probe protrudes from the anterior end of the sleeve 40 by a length 1 greater by about 1 to 2 mm than the maximum possible value of the distance d between a cathode K and the face of G2 being on the side G3 .
  • a spring 47 is disposed between the disc 45 and a ring 48 fixed inside the end 43, this spring resting on the face of the disc opposite the bottom 46.
  • the ring 48 extends to the end of the end 43.
  • a displacement sensor device 49 is fixed inside the axial hole from which the posterior end 50 of the probe 44 moves, acting as a core for this sensor.
  • a cap 51 closes the end 43.
  • the frame 52 supporting the three elements of the control device is shown very schematically in the drawing, in order to be able to represent different positions of this device in the same figure. Three of these positions are illustrated for each of elements 36 to 38.
  • Element 36 illustrates the position of the control device when the three measuring elements have been introduced into the barrel and when the front face of the sleeve 40 abuts against G2 while being stressed by the action of springs such as spring 53 shown for element 38 (the spring 53 is in this case a tension spring disposed between a part 54 of the frame 52 and a flange 55 fixed around the end 43).
  • the spring 53 is in this case a tension spring disposed between a part 54 of the frame 52 and a flange 55 fixed around the end 43.
  • the corresponding cathode has not been shown to better see the extreme output position of the feeler 44.
  • the disc 45 is then supported on the face 46 of the tubular end 43.
  • this feeler 44 When the feeler 44 is supported on the cathode (cathode K in face of the element 37), this feeler retracts very slightly (about a few tenths of a millimeter, and at most 1 to 2 mm) into the sleeve 40, which causes the disc 45 to move away from the same amount of face 46. The spring 47 then applies the probe against the cathode, as shown for element 37.
  • a "fork" 56 actuated by a jack 57 fixed on the frame 52, and disposed around the bodies of the three sleeves 40 of the elements 36 to 38, at the junction with the ends 43, simultaneously pushes the ends 43 of these three elements in the opposite direction from the cathodes, until, as shown for element 38, the probe 44 is fully retracted inside the protective sleeve 39. Then, the frame is moved so as to release the three elements of the barrel.
  • the device comprising the probes 28, 29 and triggering the output of the probing rods in the device of FIG. 1 can be adapted to the device of FIG. 3. In this case, it pushes back the fork 56 and therefore causes the simultaneous displacement of the probes 44 and their sleeves 40 towards the cathodes as soon as the sleeves 39 are in place relative to the barrel (as shown in FIG. 3).

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
  • Measuring Leads Or Probes (AREA)
EP86402860A 1985-12-23 1986-12-19 Dispositif de contrôle automatique simultané de la distance entre cathodes et deuxième grille d'un canon de tube cathodique trichrome Expired - Lifetime EP0230827B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8519069 1985-12-23
FR8519069A FR2592219B1 (fr) 1985-12-23 1985-12-23 Dispositif de controle automatique simultane de la distance entre cathodes et deuxieme grille d'un canon de tube cathodique trichrome

Publications (2)

Publication Number Publication Date
EP0230827A1 EP0230827A1 (fr) 1987-08-05
EP0230827B1 true EP0230827B1 (fr) 1990-01-31

Family

ID=9326091

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86402860A Expired - Lifetime EP0230827B1 (fr) 1985-12-23 1986-12-19 Dispositif de contrôle automatique simultané de la distance entre cathodes et deuxième grille d'un canon de tube cathodique trichrome

Country Status (6)

Country Link
US (1) US4776103A (ja)
EP (1) EP0230827B1 (ja)
JP (1) JPH07123029B2 (ja)
DE (1) DE3668725D1 (ja)
FR (1) FR2592219B1 (ja)
IN (1) IN166689B (ja)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2625837B1 (fr) * 1988-01-13 1990-11-09 Videocolor Perfectionnement aux machines d'implantation de cathode dans un canon de tube cathodique
US5574668A (en) * 1995-02-22 1996-11-12 Beaty; Elwin M. Apparatus and method for measuring ball grid arrays
US6072898A (en) * 1998-01-16 2000-06-06 Beaty; Elwin M. Method and apparatus for three dimensional inspection of electronic components
US6915006B2 (en) * 1998-01-16 2005-07-05 Elwin M. Beaty Method and apparatus for three dimensional inspection of electronic components
US6915007B2 (en) 1998-01-16 2005-07-05 Elwin M. Beaty Method and apparatus for three dimensional inspection of electronic components
JP2009216548A (ja) * 2008-03-11 2009-09-24 Mitsutoyo Corp 測定装置
CN103411526B (zh) * 2013-08-01 2016-06-08 国电南京自动化股份有限公司 断路器在线检测传感器

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3324562A (en) * 1965-04-14 1967-06-13 United States Steel Corp Thread gage
US3670421A (en) * 1971-01-04 1972-06-20 Inspection Eng And Equipment I Gaging device
US4015315A (en) * 1975-07-14 1977-04-05 Rca Corporation Method of setting cathode-G1 spacing
US4221053A (en) * 1978-11-13 1980-09-09 Libbey-Owens-Ford Company Inspection apparatus
US4292740A (en) * 1979-06-07 1981-10-06 Candid Logic, Inc. Self-actuated displacement transducer
DE3035970C2 (de) * 1980-09-24 1982-11-04 Standard Elektrik Lorenz Ag, 7000 Stuttgart Verfahren zur Justierung der Elektrodenabstände in Strahlenerzeugungssystemen von Elektronenstrahlröhren
US4400884A (en) * 1980-10-02 1983-08-30 The Boeing Company Skin contour inspection system
IT1156660B (it) * 1982-09-09 1987-02-04 Finike Italiana Marposs Testa a matita per il controllo di dimensioni lineari e relativo procedimento di assemblaggio
US4490913A (en) * 1983-01-24 1985-01-01 Vis Arthur D Low contact force position sensing probe
JPS60151940A (ja) * 1984-01-19 1985-08-10 Nec Corp 電子銃電極構体

Also Published As

Publication number Publication date
JPH07123029B2 (ja) 1995-12-25
FR2592219B1 (fr) 1988-02-12
FR2592219A1 (fr) 1987-06-26
JPS62160633A (ja) 1987-07-16
IN166689B (ja) 1990-06-30
DE3668725D1 (de) 1990-03-08
US4776103A (en) 1988-10-11
EP0230827A1 (fr) 1987-08-05

Similar Documents

Publication Publication Date Title
EP0230827B1 (fr) Dispositif de contrôle automatique simultané de la distance entre cathodes et deuxième grille d'un canon de tube cathodique trichrome
FR2580745A1 (fr) Dispositif d'ajustement pour un cable de commande d'une bicyclette
WO1983004302A1 (fr) Dispositf de manipulation d'une piece cylindrique ou spherique
FR2656555A1 (fr) Systeme mecanique de guidage automatique d'une ou plusieurs torches d'une unite de soudage a l'arc.
EP0765197B1 (fr) Dispositif de distribution de pieces a l'unite et dispositif de stockage de ces pieces
CA1092399A (fr) Connecteur a centrage automatique pour fibres optiques
EP0368777A1 (fr) Pince pneumatique
CA1292030C (fr) Dispositif de stockage d'energie mecanique a force d'accrochage nulle
FR2459462A1 (fr) Dynanometre a diaphragmes
EP0115735A2 (fr) Dispositif pour détecter des criques sur les brames d'acier sortant d'une coulée continue
EP0236371A1 (fr) Micrometre a affichage numerique.
EP0432557A1 (fr) Instrument destiné à mesurer une dimension d'un objet
FR3093175A1 (fr) Systeme de mesure d’une deformation de surface en flexion d’un materiau
WO2002055999A1 (fr) Appareil pour l'inspection d'une surface
FR2683935A1 (fr) Appareil de soudage pour des bouchons d'extremite de barres de combustible.
EP0326440B1 (fr) Perfectionnement aux machines d'implantation de cathode dans un canon de tube cathodique
EP1697088B1 (fr) Dispositif de serrage precis a actionnement rapide, et procede de commande
EP0857891B1 (fr) Dispositif de guidage en translation rectiligne d'un objet mobile par rapport à un objet fixe
FR2463389A1 (fr) Instrument de mesure destine notamment au controle de la planeite d'une surface
EP1411580B1 (fr) Dispositif pour diagnostiquer l'état de corrosion d'une batterie notamment de véhicule automobile
BE1011007A3 (fr) Vanne en ligne autoverrouillable.
EP0711973A2 (fr) Tampon de mesure pneumatique
EP1111248B1 (fr) Vérin à point d'arrêt intermédiaire
EP4303887A1 (fr) Dispositif de mesure d'une temperature maximale d'un composant place dans une enceinte de confinement d'un emballage charge d'un ensemble de matieres radioactives
FR3024538A1 (fr) Extensometre radial

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE GB IT NL

17P Request for examination filed

Effective date: 19880115

17Q First examination report despatched

Effective date: 19890131

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE GB IT NL

ITF It: translation for a ep patent filed

Owner name: JACOBACCI & PERANI S.P.A.

REF Corresponds to:

Ref document number: 3668725

Country of ref document: DE

Date of ref document: 19900308

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

ITTA It: last paid annual fee
26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: 746

Effective date: 20011016

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20031222

Year of fee payment: 18

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20041025

Year of fee payment: 19

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20041210

Year of fee payment: 19

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050701

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 20050701

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20051219

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20051219

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060701

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20051219