DE1024177B - Magnetic shielding of an annular gap magnet system with plastic or injection-molded casing - Google Patents

Magnetic shielding of an annular gap magnet system with plastic or injection-molded casing

Info

Publication number
DE1024177B
DE1024177B DET12716A DET0012716A DE1024177B DE 1024177 B DE1024177 B DE 1024177B DE T12716 A DET12716 A DE T12716A DE T0012716 A DET0012716 A DE T0012716A DE 1024177 B DE1024177 B DE 1024177B
Authority
DE
Germany
Prior art keywords
annular gap
plastic
magnet system
gap magnet
magnetic shielding
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
DET12716A
Other languages
German (de)
Inventor
Dr Phil Adalbert Graef
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.)
Tigges & Co Magnetfabrik
Original Assignee
Tigges & Co Magnetfabrik
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 Tigges & Co Magnetfabrik filed Critical Tigges & Co Magnetfabrik
Priority to DET12716A priority Critical patent/DE1024177B/en
Publication of DE1024177B publication Critical patent/DE1024177B/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H01F7/0205—Magnetic circuits with PM in general
    • H01F7/0221—Mounting means for PM, supporting, coating, encapsulating PM

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)

Description

Magnetische Abschirmung eines Ringspalt-Magnetsystems mit Kunststoff- oder Spritzgußumhüllung Das magnetische Streufeld eines Ringspalt-Magnets hat in viellen Fällen einen störenden Einfluß auf in der Nähe befindliche Apparate, insbesondere auf elektronische Verstärkeranordnungen u. dgl. Bei den bisher vielfach üblichen Ringspaltsystemen mit Dauermagnetkern wurde die magnetische Streuung durch den aus Weicheisen bestehenden Rückschlußtopf so vermindert, daß das resultierende Streufeld für die meisten Anwendungen klein genug war.Magnetic shielding of an annular gap magnet system with plastic or injection molded cover The stray magnetic field of an annular gap magnet has in In many cases, a disruptive influence on devices in the vicinity, in particular to electronic amplifier arrangements and the like with the previously widely used Annular gap systems with a permanent magnet core, the magnetic scattering by the Soft iron existing short circuit pot so reduced that the resulting stray field was small enough for most applications.

In neuerer Zeit werden einerseits für bestimmte Anwendungen (Fernsehgeräte) besonders streuarme Ringspaltsysteme gefordert, während andererseits mit einem ringförmigen Dauermagnet aufgebaute Ringspaltsysteme, die ein wesentlich stärkeres Streufeld haben, sich immer mehr einführen.More recently, on the one hand, for certain applications (television sets) Particularly low-scatter annular gap systems are required, while on the other hand with an annular Annular gap systems with permanent magnets, which have a much stronger stray field have to introduce oneself more and more.

Zur Abschirmung des Streufeldes von Magnetsystemen dient in an sich bekannter Weise eine das System außen umgebende Schicht hochpermeablen Materials, die in Form einer Haube nach der Befestigung des Magnetsystems am Korb angeschraubt oder an dem Magnet befestigt wird. Ferner sind Ausführungsbeispiele veröffentlicht worden, bei denen Korb und Haube aus einem Stück bestehen oder vor der Montage durch Schweißen und Kleben zu einem Stück vereinigt worden sind. Das Magnetsystem wird in diesem Falle mit einem Flansch versehen, der die Verbindung zu der Korb-Schutzhauben-Kombination herstellt.In itself serves to shield the stray field from magnet systems as is known, a layer of highly permeable material surrounding the system on the outside, which is screwed onto the basket in the form of a hood after the magnet system has been attached or attached to the magnet. Furthermore, exemplary embodiments are published where the basket and hood consist of one piece or before assembly Welding and gluing have been combined into one piece. The magnet system will in this case provided with a flange that connects to the basket-protective hood combination manufactures.

Erfindungsgemäß wird diese Schicht auf eine das System umgebende Schicht aus nicht ferromagnetischem Material, z. B. aus Kunststoff oder Metallspritzguß, so ein- oder aufgebracht, daß sie mit dem System einen festen einheitlichen Körper bildet. Die hochpermeable Schicht kann entweder aus Blech oder aus kleinen, mit Kunststoff verpreßten Teilchen aus einem entsprechenden ferromagnetischen Werkstoff bestehen. Sie kann mit einem Anstrich oder einer Kunststoffhülle überzogen werden.According to the invention, this layer is applied to a layer surrounding the system made of non-ferromagnetic material, e.g. B. made of plastic or metal injection molding, so inserted or applied that they form a solid, uniform body with the system forms. The highly permeable layer can either be made of sheet metal or small, with Plastic molded particles from a corresponding ferromagnetic material exist. It can be coated with paint or a plastic cover.

Es ist außerdem möglich, die Abschirmung an Lautsprecher-Magnetsystemen, an deren Kunststoffumhüllung der Lautsprecherkorb aus Kunststoff angespritzt ist, anzubringen. Die Abschirmung kann dabei auch zur Halterung des Magnetsystems herangezogen werden.It is also possible to use the shielding on loudspeaker magnet systems, the plastic loudspeaker frame is molded onto the plastic casing, to attach. The shield can also be used to hold the magnet system will.

In der Zeichnung, Abb. 1 biss 5, sind Ausführungsbeispiele dargestellt. Die allgemein bekannten Teile des Ringspaltsystems sind wie folgt bezeichnet: 4 ist die Oberplatte, 5 der Weicheisenkern, 6 der Dauermagnet, 7 die Unterplatte oder Rückschlußtopf.In the drawing, Fig. 1 to 5, exemplary embodiments are shown. The generally known parts of the annular gap system are designated as follows: 4 is the top plate, 5 the soft iron core, 6 the permanent magnet, 7 the bottom plate or Back-flow pot.

Abb. 1 zeigt ein mit Spritzguß umhülltes Ringspaltsystem mit einer Blechabschirmung 1 nach den Seiten, Abb.2 ein solches mit Abschirmung der Seiten und des Bodens; Abb. 3 zeigt ein mit Spritzguß umhülltes Ringspaltsystem mit einer abschirmenden Preßstoff-Weicheisen-Umhüllung 2; in den Abb. 4 und 5 sind Ausführungsbeispiele eines Lautsprecher-Magnetsystems dargestellt, bei dem die magnetische Abschirmung 1 auf einen Teil des Lautsprecherkorbes 3 ausgedehnt ist.Fig. 1 shows an injection molded annular gap system with a Sheet metal shielding 1 on the sides, Figure 2 one with shielding of the sides and the soil; Fig. 3 shows an injection molded annular gap system with a shielding molded soft iron sheath 2; in Figs. 4 and 5 are exemplary embodiments of a loudspeaker magnet system, in which the magnetic shielding 1 is extended to a part of the speaker basket 3.

Claims (3)

PATENTANSPRÜCHE: 1. Ringspalt-Magnetsystem mit einer zur Verringerung der magnetischen Streuung dienenden Umhüllung aus magnetisch hochpermeablem Material oder aus magnetisch hochpermeablem, in feinzerteiltem Zustand mit Kunststoff verpreßtem Werkstoff, dadurch gekennzeichnet, daß die Umhüllung auf oder in eine aus nicht ferromagnetischem Material, z. B. aus Kunststoff oder Metallspritzguß, bestehende, das Magnetsystem umgebende Schicht auf- bzw. eingebracht ist. PATENT CLAIMS: 1. Annular gap magnet system with a covering made of magnetically highly permeable material or of magnetically highly permeable material that is used to reduce the magnetic scattering, in a finely divided state with plastic compressed material, characterized in that the covering is on or in a non-ferromagnetic material, e.g. B. made of plastic or metal injection molding, existing, the magnetic system surrounding layer is applied or introduced. 2. Ringspalt-Magnetsystem nach Anspruch 1, dadurch gekennzeichnet, daß die das Magnetsystem umgebende nicht ferrornagnetische Schicht, z. B. aus Kunststoff oder Metallspritzguß. magnetisch hochpermeablen Werkstoff in feinzerteiltem Zustand enthält. 2. Annular gap magnet system according to claim 1, characterized in that the one surrounding the magnet system does not ferromagnetic layer, z. B. made of plastic or metal injection molding. Contains magnetically highly permeable material in a finely divided state. 3. Ringspalt-Magnetsystem nach Anspruch 1 oder 2 für Lautsprecher, dadurch gekennzeichnet, daß die magnetisch abschirmende Umhüllung auch den Membrankorb ganz oder teilweise umschließt und so ausgebildet ist, daß die mechanische Festig-]zeit des ivIembrankorbes erhöht wird. In Betracht gezogene Druckschriften: Deutsche Patentschrift Nr. 916 95d: deutsches Gebrauchsmuster Nr. 1 716 35?: britische Patentschrift Nr. 611 74?.3. Annular gap magnet system according to claim 1 or 2 for loudspeakers, characterized in that the magnetic shielding cover also completely or partially encloses the membrane basket and so on is designed that the mechanical strength] time of the membrane basket is increased. Documents considered: German Patent No. 916 95d: deutsches Utility Model No. 1 716 35 ?: British Patent No. 611 74 ?.
DET12716A 1956-10-03 1956-10-03 Magnetic shielding of an annular gap magnet system with plastic or injection-molded casing Pending DE1024177B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DET12716A DE1024177B (en) 1956-10-03 1956-10-03 Magnetic shielding of an annular gap magnet system with plastic or injection-molded casing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET12716A DE1024177B (en) 1956-10-03 1956-10-03 Magnetic shielding of an annular gap magnet system with plastic or injection-molded casing

Publications (1)

Publication Number Publication Date
DE1024177B true DE1024177B (en) 1958-02-13

Family

ID=7547098

Family Applications (1)

Application Number Title Priority Date Filing Date
DET12716A Pending DE1024177B (en) 1956-10-03 1956-10-03 Magnetic shielding of an annular gap magnet system with plastic or injection-molded casing

Country Status (1)

Country Link
DE (1) DE1024177B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1814860B1 (en) * 1968-12-16 1970-04-09 Deutsche Edelstahlwerke Ag Low stray field permanent magnet system for loudspeakers
DE3028065A1 (en) * 1980-07-24 1982-02-18 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Dynamic converter for TV loudspeaker - has stray field reduction using magnet air gap filled with magnetic fluid
FR2597933A1 (en) * 1986-04-25 1987-10-30 Sauveplane Pierre Improved magnetic fastening device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB611742A (en) * 1945-10-15 1948-11-03 Herbert Oesterle Ross Improved electronic shields
DE916954C (en) * 1952-03-18 1954-08-23 Philips Nv Electrodynamic loudspeaker, the magnet system of which contains a core and an annular pole piece surrounding a core end at an air gap
DE1716352U (en) * 1955-11-11 1956-02-09 Telefunken Gmbh DYNAMIC SPEAKER WITH PROTECTIVE COVER ON THE MAGNETIC SYSTEM.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB611742A (en) * 1945-10-15 1948-11-03 Herbert Oesterle Ross Improved electronic shields
DE916954C (en) * 1952-03-18 1954-08-23 Philips Nv Electrodynamic loudspeaker, the magnet system of which contains a core and an annular pole piece surrounding a core end at an air gap
DE1716352U (en) * 1955-11-11 1956-02-09 Telefunken Gmbh DYNAMIC SPEAKER WITH PROTECTIVE COVER ON THE MAGNETIC SYSTEM.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1814860B1 (en) * 1968-12-16 1970-04-09 Deutsche Edelstahlwerke Ag Low stray field permanent magnet system for loudspeakers
DE3028065A1 (en) * 1980-07-24 1982-02-18 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Dynamic converter for TV loudspeaker - has stray field reduction using magnet air gap filled with magnetic fluid
FR2597933A1 (en) * 1986-04-25 1987-10-30 Sauveplane Pierre Improved magnetic fastening device

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