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    LOUDSPEAKER MOTOR WITH INNER PERMANENT MAGNET
    3.
    发明公开
    LOUDSPEAKER MOTOR WITH INNER PERMANENT MAGNET 审中-公开

    公开(公告)号：US20230362547A1

    公开(公告)日：2023-11-09

    申请号：US18024370

    申请日：2021-09-01

    申请人： PURIFI APS

    发明人： Lars Risbo ,  Carsten Tinggaard ,  Morten Halvosen ,  Bruno Putzeys

    IPC分类号： H04R9/02 ,  H04R9/06 ,  H04R9/04

    CPC分类号： H04R9/025 ,  H04R9/045 ,  H04R9/046 ,  H04R9/06 ,  H02K41/0356

    摘要： --A motor for an electrodynamic loudspeaker and an electrodynamic loudspeaker including the motor. The motor includes a magnetic circuit assembly arranged about a motor axis. The motor includes: a magnetically permeable top plate, a magnetically permeable bottom plate, a magnetically permeable member disposed between, and magnetically coupled to, the magnetically permeable top and bottom plates, a center pole piece and an air gap for receipt of a voice coil. The motor also includes an outwardly projecting magnetically permeable member, or hat, arranged above a top of the air gap. The center pole piece includes a permanent magnet, such as a Neodymium magnet or a Ferrite magnet, extending axially from at least the bottom of the air gap to a magnetically permeable bottom member or to the magnetically permeable bottom plate.-

    Method of controlling loudspeaker diaphragm excursion
    4.
    发明授权
    Method of controlling loudspeaker diaphragm excursion 有权

    公开(公告)号：US10728659B2

    公开(公告)日：2020-07-28

    申请号：US16097991

    申请日：2017-05-02

    申请人： Purifi APS

    发明人： Bruno Putzeys ,  Lars Risbo

    IPC分类号： H04R3/00 ,  H04R29/00 ,  H04R3/06

    摘要： The present invention relates in one aspect to a method of controlling or limiting diaphragm excursion of a loudspeaker. The method comprising steps of receiving a first audio signal and deriving an excursion signal representing diaphragm excursion of the electrodynamic loudspeaker from the first audio signal. The method additionally comprises deriving an excursion envelope from the excursion signal and applying a second audio signal, derived from the first audio signal, to an input of an adjustable low-frequency suppressor. The second audio signal is filtered by the adjustable low-frequency suppressor to selectively attenuate low-frequency components based on the excursion envelope to produce a processed audio signal with reduced low-frequency content.

    Loudspeaker motor with improved linearity
    5.
    发明授权
    Loudspeaker motor with improved linearity 有权

    公开(公告)号：US11956612B2

    公开(公告)日：2024-04-09

    申请号：US17434086

    申请日：2020-02-12

    申请人： PURIFI APS

    发明人： Lars Risbo ,  Carsten Tinggaard ,  Morten Halvorsen ,  Bruno Putzeys

    IPC分类号： H04R9/02 ,  H04R7/12

    CPC分类号： H04R9/025 ,  H04R7/12 ,  H04R2209/024

    摘要： The present invention relates to a motor for an electrodynamic loudspeaker, comprising a magnetic circuit assembly arranged about a motor axis. The magnetic circuit assembly comprises: an outer magnet, a magnetically permeable top plate, a magnetically permeable bottom plate, a center pole piece and an air gap for receipt of a voice coil. The air gap is formed by an inner axially extending wall of the magnetically permeable top plate facing an axially extending peripheral wall section of the center pole piece to define a width, a bottom, a top and height of the air gap. The magnetic circuit assembly additionally comprises outwardly projecting magnetically permeable member arranged above the top of the air gap. The center pole piece comprises a magnetic member extending axially from at least the bottom of the air gap to a magnetically permeable bottom member or to the magnetically permeable bottom plate. The magnetic member exhibits a relative AC magnetic permeability smaller than 10, such as smaller than 5 or smaller than 2, such as about 1 which corresponds to the relative AC magnetic permeability of free air.

    LOUDSPEAKER MOTOR WITH IMPROVED LINEARITY
    7.
    发明申请
    LOUDSPEAKER MOTOR WITH IMPROVED LINEARITY 有权

    公开(公告)号：US20220141592A1

    公开(公告)日：2022-05-05

    申请号：US17434086

    申请日：2020-02-12

    申请人： PURIFI APS

    发明人： Lars Risbo ,  Carsten Tinggaard ,  Morten Halvorsen ,  Bruno Putzeys

    IPC分类号： H04R9/02 ,  H04R7/12

    摘要： A motor for an electrodynamic loudspeaker. The motor includes a magnetic circuit assembly arranged about a motor axis. The assembly includes: an outer magnet, a magnetically permeable top plate, a magnetically permeable bottom plate, a center pole piece and an air gap for receipt of a voice coil. The air gap is formed by an inner wall of the magnetically permeable top plate facing an axially extending peripheral wall section of the center pole piece to define the air gap. The magnetic circuit assembly also includes an outwardly projecting magnetically permeable member arranged above the air gap. The center pole piece has a magnetic member extending axially from the bottom of the air gap to a magnetically permeable bottom member or to the bottom plate. The magnetic member exhibits a relative AC magnetic permeability smaller than 10, which corresponds to the relative AC magnetic permeability of free air.