Dispositif haut-parleur avec fluide magnétique

Lautsprechervorrichtung mit magnetischer Flüssigkeit

Speaker device with magnetic fluid

Abstract

The speaker device (100, 200, 300) includes the magnetic circuit system (30) having an annular plate (3) and magnetic fluid (4), and a vibration system (31) having a voice coil bobbin (5) and a voice coil (6). When the speaker device is not driven, the voice coil (6) is located at a predetermined stationary position within the magnetic gap (9) filled with the magnetic fluid (4). Within the magnetic gap (9), a recess portion (60,5a,70) into which the greater part of the magnetic fluid (4) flows is formed in the voice coil (6) or voice coil bobbin (5). When the speaker device is not driven, the greater part of the magnetic fluid (4) enters the recess portion (60,5a,70) and forms a stable condition. Thereby, in the case where the edge is formed by soft material, the voice coil (6) is never affected by the buoyant force of the magnetic fluid (4) and reliably held at the predetermined stationary position within the magnetic gap (9).

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Description

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Patent Citations (3)

    Publication numberPublication dateAssigneeTitle
    JP-S60187200-ASeptember 24, 1985Hitachi LtdDynamic type driving device
    US-4414437-ANovember 08, 1983Licentia Patent-Verwaltungs-GmbhMoving coil dynamic transducer
    WO-9613960-A1May 09, 1996Dan KristoffersenElectrodynamic loudspeaker with fluid-supported moving system

NO-Patent Citations (1)

    Title
    PATENT ABSTRACTS OF JAPAN vol. 010, no. 027 (E - 378) 4 February 1986 (1986-02-04)

Cited By (0)

    Publication numberPublication dateAssigneeTitle