EP0266813A1 - Entmagnetisierungs- und Erdungsvorrichtung für eine Bildröhre und Apparat für ihre Herstellung - Google Patents

Entmagnetisierungs- und Erdungsvorrichtung für eine Bildröhre und Apparat für ihre Herstellung Download PDF

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Publication number
EP0266813A1
EP0266813A1 EP87201916A EP87201916A EP0266813A1 EP 0266813 A1 EP0266813 A1 EP 0266813A1 EP 87201916 A EP87201916 A EP 87201916A EP 87201916 A EP87201916 A EP 87201916A EP 0266813 A1 EP0266813 A1 EP 0266813A1
Authority
EP
European Patent Office
Prior art keywords
strand
tube
demagnetization
conductor
winding
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
EP87201916A
Other languages
English (en)
French (fr)
Other versions
EP0266813B1 (de
Inventor
Patrick Société Civile S.P.I.D. Besnard
Jacques Société Civile S.P.I.D. Dupaillon
Georges Société Civile S.P.I.D. Prigent
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.)
LA RADIOTECHNIQUE PORTENSEIGNE
Koninklijke Philips NV
Original Assignee
LA RADIOTECHNIQUE PORTENSEIGNE
RADIOTECH IND COMMERC SA
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 LA RADIOTECHNIQUE PORTENSEIGNE, RADIOTECH IND COMMERC SA, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical LA RADIOTECHNIQUE PORTENSEIGNE
Publication of EP0266813A1 publication Critical patent/EP0266813A1/de
Application granted granted Critical
Publication of EP0266813B1 publication Critical patent/EP0266813B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01J29/003—Arrangements for eliminating unwanted electromagnetic effects, e.g. demagnetisation arrangements, shielding coils
    • 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
    • H01J29/92—Means forming part of the tube for the purpose of providing electrical connection to it
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/0007—Elimination of unwanted or stray electromagnetic effects
    • H01J2229/0046—Preventing or cancelling fields within the enclosure
    • H01J2229/0053—Demagnetisation

Definitions

  • the invention relates to a device for the demagnetization of a picture tube of a television receiver and for the earthing of a conductive coating applied to the cone of said tube, comprising a demagnetization coil consisting of a strand of wires. electrical insulated, held together and forming at least one loop applied to the cone of the tube, and an electrical conductor connected to ground and placed in electrical contact with said coating.
  • a device performing this function and comprising the above elements is described, for example, in German Utility Model No. 70 30 109.
  • the device described in this document uses a metal part shaped spider whose legs are attached to slits of the image tube belt by means of hooks and laces, and are themselves provided with fingers ensuring the attachment of the demagnetization coil, as well as recesses allowing to hang a conducting conductive tape to earth provided with a tension spring.
  • This device includes a mechanical support, the price of which is added to that of the coil and the grounding tape, and the assembly of the assembly requires a large number of operations: hooking the tabs and putting the laces in place. , then the reel, and finally the ribbon and its spring.
  • the invention proposes to provide an inexpensive device in itself, and the implementation of which is extremely simplified.
  • the device according to the invention is notably remarkable in that said grounding conductor surrounds the strand of the demagnetization winding.
  • this conductor does not require any particular fixing part, nor any specific mounting operation: it is hole ve fixed at the same time as the coil.
  • the contact between this conductor and the coating is ensured along several distinct lines in different regions of the coating, which reduces its electrical resistance.
  • said conductor is advantageously a bare electric wire, wound in a spiral with the same pitch as the strip.
  • said conductor is advantageously constituted by said sheath itself, which is made conductive at least on the surface.
  • the device also has an indirect advantage.
  • the good insulation of the winding, connected to the sector, is of great importance and standards provide for the testing of this insulation.
  • an electrical contact surface must be provided around the strand; this is why this test could only be carried out in the prior art by sampling, to the detriment of safety.
  • each winding is provided with a ground conductor which surrounds it and an insulation test on 100% of the parts is easy to carry out.
  • the fixing of the coil, that of the earthing conductor and also the earthing of the tube belt, in the case of a tube intended to be fixed by means of ears with which it is provided the strand of the winding provided with the grounding conductor advantageously passes in front of the ears and is fixed by this only means.
  • this has the advantage of ensuring the grounding of the tube anti-implosion belt without additional means.
  • said conductor can advantageously also be connected to one of the terminals of said connector.
  • the invention also relates to a machine for manufacturing a demagnetization device according to the invention, with which the strand of the demagnetization winding is wrapped, a machine provided with a rotary magazine for cutting a strip of plastic material and winding it around in a spiral. of the strand, which is advantageously provided with a second rotary magazine driven with the first for cutting and winding a bare conductive wire in order to wind during a single winding operation the conductive wire and the strip of plastic material .
  • the cathode ray tube, or picture tube, of FIG. 1 is covered with a conductive coating 7, generally a graphite coating, on the major part of its cone 6. It is equipped with an anti-metallic belt -implosion 5 which carries ears 31, 32 for fixing the tube. It must also be fitted with a demagnetization coil; this winding comprises a plurality of turns of insulated electrical wires, constituting a strand of wires held together, and the whole resembles a sort of hose which is applied to the cone 6 of the tube so as to form at least one loop therein.
  • this hose 4 can be placed so as to form two loops, one of which is located on the upper half of the cone, and the other on the lower half, the neck 13 of the tube not being included in a loop.
  • an electrical conductor here a bare electrical wire 1 connected to ground, is wound in a spiral around the strand of wires 4.
  • the belt 5 of the tube is here provided with ears 31 to 34 allowing the fixing of the tube in a cabinet or a frame.
  • the strand 4 provided with the grounding conductor 1 passes in front of the ear 31 (the word “in front” means: “on the side of the front face of the tube", that is to say behind the ear in the figure), follows the belt towards the ear 32 in front of which it passes, crosses diagonally the cone towards the ear 34, passes in front of the ear 34, runs along the belt and passes forward from the ear 33 then crosses again, diagonally, the cone passing under the neck 13 towards the ear 31 where we find the starting point of this description of the path of the strand.
  • the strand is fixed to the tube 6 by the mere fact that it passes in front of the ears.
  • a spring 8 (fig. 2A), pulling the two diagonal branches of the path towards each other, ensures a tension of the winding which it applies to the graphite cone, thus allowing electrical contact between the wire 4 wound in a spiral around the strand and the graphite coating of the tube.
  • Two necklaces 14 (fig. 2B) formed a notched strap with irreversible tightening can also ensure the tension of the winding.
  • the winding is provided with a connector 2 to which the two ends of the insulated electrical wire which constitutes the winding are connected; it is interesting to take advantage of the presence of this connector to also connect the grounding conductor 1 to it, which provides a means of connecting this conductor to, for example, the mass of a chassis.
  • FIG. 3 represents a cut part of the strand of FIGS. 2.
  • the insulated conducting wires 12 are surrounded by a strip of plastic material 10, wound in a spiral around them and which holds them together.
  • the conductor 1 is a bare electrical wire, for example of tinned copper, which is wound in a spiral around the plastic strip 10.
  • this wire it is advantageous, to simplify the manufacture of the assembly, for this wire to be wound with the same step as strip 10.
  • FIG. 4 represents a part cut in another variant of a strand according to the invention: the strand of insulated conductive wire 12 is here surrounded by a sheath 9 which holds the strands of the strand together; this cylindrical plastic sheath can be welded at 11 along a generator, for example by means of ultrasonic welding.
  • this sheath is made of a material loaded with conductive particles or else it is metallized on the surface. It is connected to ground by any known means, for example by providing a ground wire 16 with an elastic clamp 15 (fig.2B) which clamps the strand at a point along its length, or else by connecting the spring 8 of Figure 2A to ground.
  • At least one means of connection with the mass of this kind is always necessary, even in the case where there is a wire 1 connected to the connector 2, since several masses must be joined to the coating of the cone and it is necessary that they be brought at different points. (Among other things, the mass of a "focus spark gap" located near the base of the image tube must not be connected to the same point of the sheath of the strand as the other masses).
  • metal collars 14 which would be provided with lugs for connecting a ground wire of the kind of wire 16 to it.
  • FIGS. 5 and 6 A machine for wrapping a strand as shown in fig. 3 is itself shown diagrammatically in FIGS. 5 and 6.
  • a coil 17 delivers a ribbon 10 which is driven and guided by pulleys 18, then passes through an element 19 for measuring the length delivered and a system of section 20.
  • the ribbon is then brought to a rotary circular magazine 25 consisting of a wheel carrying near its rim a plurality of idler pulleys 41 to 48.
  • the winding strand 4 to be wrapped crosses the magazine in its center, parallel to the axis of rotation of the magazine, that is to say perpendicular to the paper which carries the figure.
  • Figure 6 shows with the same references as Figure 5 the elements in the region of the magazine 25, seen from the side, that is to say with the observer substantially in the plane of the wheel.
  • the dotted loop 39 indicates that the winding 4 is a ring which closes passing through the outside of the magazine 25.
  • the winding 4 is introduced into the magazine before starting the machine through a notch 24 in the magazine wheel, and it is tensioned so that it is firmly held in the center of the magazine 25.
  • a second magazine is added to this machine for cutting and winding a bare conducting wire, advantageously constituted here by a set of second idler pulleys placed on the same axes as the first. They are visible in Figure 6 where the references 41 to 48 of the pulleys of Figure 5 are split with an additional reference "A” or "B” (some of them only are shown so as not to overload the figure).
  • a coil 21 of wire 1 delivers the bare electric wire via guides 22 followed by a system similar to that intended for the ribbon where the references 23, 29, 30 correspond respectively to the references 18, 19, 20.
  • the references 1, 36, 37 of FIG. 6 correspond respectively for the wire to the references 10, 26, 27 for the plastic strip.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Insertion, Bundling And Securing Of Wires For Electric Apparatuses (AREA)
  • Elimination Of Static Electricity (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
EP87201916A 1986-10-10 1987-10-07 Entmagnetisierungs- und Erdungsvorrichtung für eine Bildröhre und Apparat für ihre Herstellung Expired - Lifetime EP0266813B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8614125A FR2605169B1 (fr) 1986-10-10 1986-10-10 Dispositif de demagnetisation et de mise a la masse pour un tube-image, et machine pour le fabriquer
FR8614125 1986-10-10

Publications (2)

Publication Number Publication Date
EP0266813A1 true EP0266813A1 (de) 1988-05-11
EP0266813B1 EP0266813B1 (de) 1990-09-19

Family

ID=9339750

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87201916A Expired - Lifetime EP0266813B1 (de) 1986-10-10 1987-10-07 Entmagnetisierungs- und Erdungsvorrichtung für eine Bildröhre und Apparat für ihre Herstellung

Country Status (8)

Country Link
US (1) US4812946A (de)
EP (1) EP0266813B1 (de)
JP (1) JPS63107387A (de)
CN (1) CN1017107B (de)
AU (1) AU603962B2 (de)
DE (1) DE3765086D1 (de)
ES (1) ES2018536B3 (de)
FR (1) FR2605169B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2690269A1 (fr) * 1992-04-20 1993-10-22 Mitsubishi Electric Corp Mécanisme formant écran magnétique d'un dispositif de visualisation d'images.
CN1040934C (zh) * 1991-07-18 1998-11-25 东芝株式会社 阴极射线管图像显示装置
WO1999022526A1 (en) * 1997-10-24 1999-05-06 Nagamori, Satoshi Geomagnetic correction apparatus and television receiver employing the same

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4916358A (en) * 1988-10-25 1990-04-10 Rca Licensing Corporation Kinescope grounding system
NL9002618A (nl) * 1990-11-30 1992-06-16 Philips Nv Inrichting voor het demagnetiseren van een beeldbuis.
US5216326A (en) * 1991-10-31 1993-06-01 Apple Computer, Inc. Injection molded printed circuit degauss coil
US5416595A (en) * 1993-04-29 1995-05-16 Sony Electronics Inc. Methods and apparatus for securing a degaussing coil
DE4441013C2 (de) * 1994-11-17 2000-04-13 Loewe Opta Gmbh Vorrichtung zur Herstellung einer Masseverbindung mit der Aquadierung einer Bildröhre
KR0155892B1 (ko) * 1995-09-30 1998-10-15 김광호 음극선관의 디가우징 코일 고정구
ES2108648B1 (es) * 1996-01-11 1998-07-01 Arnaiz Alfredo Alarcia Dispositivo de desmagnetizacion y conexion a masa para tubos de rayos catodicos en color.
KR100265172B1 (ko) * 1996-02-24 2000-09-15 윤종용 모니터의 디가우징 코일 고정장치
KR100225045B1 (ko) * 1996-05-13 1999-10-15 구자홍 영상표시기기의 전면 전계 복사 노이즈 차단 장치
DE19647120C1 (de) * 1996-11-14 1998-05-07 Kunststoff Spritzgusteile Gerh Halter für Entmagnetisierungsspulen von Bildröhren

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2478372A1 (fr) * 1980-03-12 1981-09-18 Licentia Gmbh Tube a rayons cathodiques comprenant des moyens pour realiser sa connection electrique a la masse
DE3534150A1 (de) * 1985-09-25 1987-04-02 Newek Neue Elektronik Werke Gm Farbbildroehre mit einer entmagnetisierungsspule

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS551786A (en) * 1978-06-19 1980-01-08 Sanyo Electric Co Ltd Demagnetizing coil for color television receiver
US4441052A (en) * 1982-11-26 1984-04-03 Rca Corporation Degaussing circuit for television receiver having switched mode power supply
JPS60106286A (ja) * 1983-11-14 1985-06-11 Matsushita Electric Ind Co Ltd 映像管装置
JPS60106285A (ja) * 1983-11-14 1985-06-11 Matsushita Electric Ind Co Ltd 映像管装置
US4700260A (en) * 1986-05-30 1987-10-13 Rca Corporation Degaussing coil and ground strap mounting arrangement

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2478372A1 (fr) * 1980-03-12 1981-09-18 Licentia Gmbh Tube a rayons cathodiques comprenant des moyens pour realiser sa connection electrique a la masse
DE3534150A1 (de) * 1985-09-25 1987-04-02 Newek Neue Elektronik Werke Gm Farbbildroehre mit einer entmagnetisierungsspule

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 4, no. 28 (E-1)[510], 8 mars 1980; & JP-A-55 001 786 (SANYO DENKI K.K.) 08-01-1980 *
PATENT ABSTRACTS OF JAPAN, vol. 9 no. 258 (E-350)[1981], 16 octobre 1985; & JP-A-60 106 283 (MATSUSHITA DENKI SANGYO K.K.) 11-06-1985 *
PATENT ABSTRACTS OF JAPAN, vol. 9, no. 258 (E-350)[1981], 16 octobre 1985; & JP-A-60 106 286 (MATSUSHITA DENKI SANGYO K.K.) 11-06-1985 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1040934C (zh) * 1991-07-18 1998-11-25 东芝株式会社 阴极射线管图像显示装置
FR2690269A1 (fr) * 1992-04-20 1993-10-22 Mitsubishi Electric Corp Mécanisme formant écran magnétique d'un dispositif de visualisation d'images.
WO1999022526A1 (en) * 1997-10-24 1999-05-06 Nagamori, Satoshi Geomagnetic correction apparatus and television receiver employing the same

Also Published As

Publication number Publication date
AU7942987A (en) 1988-04-14
AU603962B2 (en) 1990-11-29
ES2018536B3 (es) 1991-04-16
FR2605169A1 (fr) 1988-04-15
US4812946A (en) 1989-03-14
JPS63107387A (ja) 1988-05-12
CN87106861A (zh) 1988-04-20
EP0266813B1 (de) 1990-09-19
DE3765086D1 (de) 1990-10-25
CN1017107B (zh) 1992-06-17
FR2605169B1 (fr) 1988-12-09

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