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DE1186561B - Ring-shaped correction magnet for cathode ray tubes and method for manufacturing the correction magnet - Google Patents

Ring-shaped correction magnet for cathode ray tubes and method for manufacturing the correction magnet

Info

Publication number
DE1186561B
DE1186561B DEM45842A DEM0045842A DE1186561B DE 1186561 B DE1186561 B DE 1186561B DE M45842 A DEM45842 A DE M45842A DE M0045842 A DEM0045842 A DE M0045842A DE 1186561 B DE1186561 B DE 1186561B
Authority
DE
Germany
Prior art keywords
ring
correction magnet
cathode ray
ray tubes
shaped correction
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.)
Pending
Application number
DEM45842A
Other languages
German (de)
Inventor
Dr Erich Steingroever
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.)
Magnetfabrik Bonn GmbH
Original Assignee
Magnetfabrik Bonn GmbH
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 Magnetfabrik Bonn GmbH filed Critical Magnetfabrik Bonn GmbH
Priority to DEM45842A priority Critical patent/DE1186561B/en
Priority to US121444A priority patent/US3205414A/en
Priority claimed from GB958062A external-priority patent/GB983257A/en
Publication of DE1186561B publication Critical patent/DE1186561B/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
    • H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
    • H01F1/06—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder
    • H01F1/08—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
    • H01F1/083—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together in a bonding agent
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
    • H01F1/10—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure
    • H01F1/11—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles
    • H01F1/113—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles in a bonding agent
    • 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
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/54—Arrangements for centring ray or beam
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49075—Electromagnet, transformer or inductor including permanent magnet or core
    • Y10T29/49076—From comminuted material

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Description

BUNDESREPUBLIK DEUTSCHLANDFEDERAL REPUBLIC OF GERMANY

DEUTSCHESGERMAN

PATENTAMTPATENT OFFICE

AUSLEGESCHRIFTEDITORIAL Internat. Kl.: HOIjBoarding school Kl .: HOIj Deutsche KL: 21g-13/22German KL: 21g-13/22

Nummer: 1186 561Number: 1186 561

Aktenzeichen: M 45842 VIII c/21 gFile number: M 45842 VIII c / 21 g Anmeldetag: 6. Juli 1960 Filing date: July 6, 1960 Auslegetag: 4. Februar 1965Opening day: February 4, 1965

Die Erfindung betrifft einen ringförmigen Korrekturmagnet mit Betätigungsgriffen für Kathodenstrahlröhren, der aus homogenem Magnetwerkstoff besteht. Zur Strahlverschiebung in Kathodenstrahlröhren (Bildröhren oder Oszillographenröhren) werden ringförmige Dauermagnete verwendet, die um den Röhrenhals angeordnet sind und ein quer zur Strahlrichtung liegendes Magnetfeld von einigen Oersted erzeugen. Durch Drehen dieser sogenannten Korrekturringe kann der Einfluß von Fremdfeldern und des magnetischen Erdfeldes auf die Bildlage ausgeglichen werden. Zur Betätigung besitzen diese Korrekturringe über die Ringebene vorstehende Griffe.The invention relates to an annular correction magnet with operating handles for cathode ray tubes, which consists of a homogeneous magnetic material. For beam shifting in cathode ray tubes (Picture tubes or oscilloscope tubes) ring-shaped permanent magnets are used around the Tube neck are arranged and a magnetic field lying transversely to the direction of the beam of a few oersteds produce. By turning these so-called correction rings, the influence of external fields and the magnetic earth field to be balanced on the picture position. These have correction rings for actuation handles protruding beyond the ring plane.

Bekannte Korrekturringe dieser Art bestehen aus einem Kunststoffträger, in welchen ein ringförmiger Draht aus einem dauermagnetischen Werkstoff eingelassen ist. Bei anderen Korrekturringen ist eine Mischung von Magnetpulver und Kunststoff in eine ringförmige Ausnehmung eines ebenfalls aus Kunststoff bestehenden Trägers eingespritzt. aoKnown correction rings of this type consist of a plastic carrier in which an annular Wire made of a permanent magnetic material is embedded. With other correction rings there is a mixture of magnetic powder and plastic in an annular recess, also made of plastic injected into existing carrier. ao

Es sind auch ringförmige Korrekturmagnete mit seitlichen Betätigungsgriffen bekannt, die aus homogenem Magnetwerkstoff bestehen, z. B. aus Stahlblech oder aus einer Mischung von Magnetpulver und Kunststoff, die im Spritzguß- oder Preßverfahren hergestellt werden. Sie sind als Ganzes magnetisiert, so daß auch die Betätigungsgriffe zum Magnetfeld beitragen; dieser Beitrag zum Magnetfeld des einfachen Ringes in seinem Mittelpunkt ist aber unerwünscht, weil er dieses vor allem in axialer Richtung vergrößert. Das Korrekturfeld soll aber in axialer Richtung möglichst wenig ausgedehnt sein.There are also ring-shaped correction magnets with lateral operating handles known, which are made of homogeneous Magnetic material exist, z. B. made of sheet steel or a mixture of magnetic powder and plastics made by injection molding or compression molding. They are magnetized as a whole, so that the operating handles also contribute to the magnetic field; this contribution to the magnetic field of the simple Ring in its center is undesirable because it mainly in the axial direction enlarged. The correction field should, however, be expanded as little as possible in the axial direction.

Die Erfindung behebt diesen Fehler der bekannten einstückigen Korrekturmagnete für Kathodenstrahlröhren, die aus homogenem Magnetwerkstoff bestehen, dadurch, daß erfindungsgemäß die Betätigungsgriffe nicht magnetisiert sind. Dies kann dadurch erreicht werden, daß bei der Aufmagnetisierung des ringförmigen Teiles die Betätigungsgriffe magnetisch abgeschirmt oder kurzgeschlossen werden oder dadurch, daß die Betätigungsgriffe einem magnetischen Kompensationsfeld ausgesetzt werden, so daß sie unmagnetisch bleiben. Es ist aber auch möglich, die Betätigungsgriffe nach der Aufmagnetisierung des ganzen Körpers allein wieder zu entmagnetisieren. In A b b. 1 ist 1 der magnetisch wirksame Ring, der im Spritzgußverfahren etwa aus einer Mischung von 3 Gewichtsteilen Oxydmagnetpulver (BaO · 6 Fe2O3) und 1 Gewichtsteil Polyäthylen hergestellt und mittels einer Magnetisierungsspule 2 von innen heraus so magnetisiert ist, daß sich ein Magnetfeld in Richtung des Pfeiles N-S bildet, welches Ringförmiger Korrekturmagnet für
Kathodenstrahlröhren und Verfahren zur
Herstellung des KorrekturmagnetenThe invention eliminates this error of the known one-piece correction magnets for cathode ray tubes, which consist of homogeneous magnetic material, in that, according to the invention, the operating handles are not magnetized. This can be achieved by magnetically shielding or short-circuiting the operating handles when the ring-shaped part is magnetized, or by exposing the operating handles to a magnetic compensation field so that they remain non-magnetic. However, it is also possible to demagnetize the operating handles again after the entire body has been magnetized. In A b b. 1 is the magnetically effective ring, which is manufactured in an injection molding process from a mixture of 3 parts by weight of oxide magnetic powder (BaO 6 Fe 2 O 3 ) and 1 part by weight of polyethylene and is magnetized from the inside by means of a magnetizing coil 2 in such a way that a magnetic field is created Direction of arrow NS forms which ring-shaped correction magnet for
Cathode ray tubes and methods for
Manufacture of the correction magnet

Anmelder:Applicant:

Magnetfabrik Bonn G. m. b. H.,
vorm. Gewerkschaft Windhorst,
Bonn, Dorotheenstr. 215Magnet factory Bonn G. mb H.,
vorm. Windhorst union,
Bonn, Dorotheenstr. 215

Als Erfinder benannt:Named as inventor:

Dr. Erich S'teingroever, BonnDr. Erich S'teingroever, Bonn

im Ring etwa entlang den gestrichelt gezeichneten Linien verläuft. Die beiden Betätigungsgriffe 3 und 4 sind während des Magnetisierungsvorganges von den in Abb. 2 dargestellten Hülsen 5 und 6 aus Eisenblech umgeben, so daß sie praktisch unmagnetisch bleiben und das Korrekturfeld nicht stören. Nach der Magnetisierung werden die Abschirmhülsen 5 und 6 wieder entfernt.runs in the ring roughly along the dashed lines. The two operating handles 3 and 4 are during the magnetization process of the sleeves 5 and 6 shown in Fig. 2 made of sheet iron surrounded so that they remain practically non-magnetic and do not interfere with the correction field. After Magnetization, the shielding sleeves 5 and 6 are removed again.

Bei einem anderen Verfahren werden die Betätigungsgriffe über die Ringform hinaus mit Abschirmhülsen aus einem elektrisch gut leitenden Werkstoff während der Magnetisierung geschützt, z. B. mit solchen aus Kupfer oder Aluminium. Es ist aber auch möglich, durch besondere Zusatzspulen während des Magnetisierungsvorganges das Aufmagnetisieren dieser Vorsprünge zu vermeiden; diese Zusatzspulen werden zweckmäßig mit der Hauptmagnetisierungsspule in Reihe geschaltet und kompensieren das Magnetisierungsfeld an den Stellen der Vorsprünge. In another method, the actuating handles are provided with shielding sleeves beyond the ring shape Protected from a material with good electrical conductivity during magnetization, e.g. B. with those made of copper or aluminum. But it is also possible to use special additional coils during to avoid magnetizing these projections during the magnetization process; these additional coils are conveniently connected in series with the main magnetizing coil and compensate the magnetization field at the locations of the protrusions.

Korrekturringe nach der Erfindung können aus beliebigem Magnetwerkstoff bestehen. Besonders vorteilhaft ist es, sie aus gepulvertem Magnetwerkstoff und einem Kunststoffbindemittel herzustellen, beispielsweise aus Oxydmagnetpulver (BaO · 6 Fe2O3) und Polyäthylen im Spritzgußverfahren.Correction rings according to the invention can consist of any magnetic material. It is particularly advantageous to manufacture them from powdered magnetic material and a plastic binder, for example from oxide magnetic powder (BaO · 6 Fe 2 O 3 ) and polyethylene in an injection molding process.

Claims (4)

Patentansprüche:Patent claims: 1. Ringförmiger Korrekturmagnet mit Betätigungsgriffen für Kathodenstrahlröhren, der aus homogenem Magnetwerkstoff besteht, dadurch gekennzeichnet, daß die Betätigungsgriffe nicht magnetisiert sind.1. Ring-shaped correction magnet with operating handles for cathode ray tubes, which consists of homogeneous magnetic material, characterized in that the operating handles are not magnetized. 509 507/260509 507/260 2. Verfahren zur Herstellung des ringförmigen Korrekturmagnets nach Anspruch 1, dadurch gekennzeichnet, daß bei der Aufmagnetisierung des ringförmigen Teiles die Betätigungsgriffe magnetisch abgeschirmt oder kurzgeschlossen werden.2. A method for producing the ring-shaped correction magnet according to claim 1, characterized in that that when the annular part is magnetized, the actuating handles are magnetic shielded or short-circuited. 3. Verfahren zur Herstellung des ringförmigen Korrekturmagnets nach Anspruch 1, dadurch gekennzeichnet, daß bei der Aufmagnetisierung des ringförmigen Teiles die Betätigungsgriffe einem Kompensationsfeld ausgesetzt werden, so daß sie unmagnetisch bleiben.3. A method for producing the ring-shaped correction magnet according to claim 1, characterized in that that in the magnetization of the annular part, the operating handles one Compensation field are exposed, so that they remain non-magnetic. 4. Verfahren zur Herstellung des ringförmigen Korrekturmagnets nach Anspruch 1, dadurch gekennzeichnet, daß die Betätigungsgriffe nach der Aufmagnetisierung des ganzen Körpers entmagnetisiert werden. , - ■ ·4. The method for producing the ring-shaped correction magnet according to claim 1, characterized in that that the operating handles are demagnetized after the magnetization of the whole body will. , - ■ · In Betracht gezogene Druckschriften: Deutsche Patentschrift Nr. 973 714; deutsche Gebrauchsmuster Nr. 1 779 082, 1782320.Documents considered: German Patent No. 973 714; German utility model No. 1 779 082, 1782320. Hierzu 1 Blatt Zeichnungen1 sheet of drawings 509 507/260 1.65 © Bundesdruckerei Berlin509 507/260 1.65 © Bundesdruckerei Berlin
DEM45842A 1960-07-06 1960-07-06 Ring-shaped correction magnet for cathode ray tubes and method for manufacturing the correction magnet Pending DE1186561B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DEM45842A DE1186561B (en) 1960-07-06 1960-07-06 Ring-shaped correction magnet for cathode ray tubes and method for manufacturing the correction magnet
US121444A US3205414A (en) 1960-07-06 1961-07-03 Correction magnets for cathode-ray tubes and methods for magnetizing same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEM45842A DE1186561B (en) 1960-07-06 1960-07-06 Ring-shaped correction magnet for cathode ray tubes and method for manufacturing the correction magnet
GB958062A GB983257A (en) 1962-03-13 1962-03-13 Improvements in or relating to corrector magnets

Publications (1)

Publication Number Publication Date
DE1186561B true DE1186561B (en) 1965-02-04

Family

ID=25987010

Family Applications (1)

Application Number Title Priority Date Filing Date
DEM45842A Pending DE1186561B (en) 1960-07-06 1960-07-06 Ring-shaped correction magnet for cathode ray tubes and method for manufacturing the correction magnet

Country Status (2)

Country Link
US (1) US3205414A (en)
DE (1) DE1186561B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL148440C (en) * 1964-08-31

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1782320U (en) * 1958-05-20 1959-02-05 Telefunken Gmbh ARRANGEMENT FOR THE CENTERING OF THE ELECTRON BEAM OF A CATHODE BEAM TUBE, IN PARTICULAR FOR TELEVISION RECEIVERS.
DE973714C (en) * 1949-02-18 1960-05-19 Pye Ltd Device for centering the electron beam of a cathode ray tube
DE1779082A1 (en) * 1968-07-05 1971-12-02 Naue Kg E A H Molded ready-made cushions made of foam

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA489657A (en) * 1953-01-13 Richard James Court Patrick Beam centering devices for cathode ray tubes
US2542924A (en) * 1950-06-21 1951-02-20 Myron R Heppner Ion trap
GB731451A (en) * 1952-10-23 1955-06-08 Dennis Henry Covill Improvements in or relating to arrangements for use with cathode ray tubes
US2922908A (en) * 1955-08-31 1960-01-26 Westinghouse Electric Corp Retaining device
US2950407A (en) * 1956-12-21 1960-08-23 Rca Corp Electric beam controlling apparatus
GB858627A (en) * 1959-10-26 1961-01-11 Mullard Ltd Cathode-ray tube deflector magnets

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE973714C (en) * 1949-02-18 1960-05-19 Pye Ltd Device for centering the electron beam of a cathode ray tube
DE1782320U (en) * 1958-05-20 1959-02-05 Telefunken Gmbh ARRANGEMENT FOR THE CENTERING OF THE ELECTRON BEAM OF A CATHODE BEAM TUBE, IN PARTICULAR FOR TELEVISION RECEIVERS.
DE1779082A1 (en) * 1968-07-05 1971-12-02 Naue Kg E A H Molded ready-made cushions made of foam

Also Published As

Publication number Publication date
US3205414A (en) 1965-09-07

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