Loudspeaker system having a bass-reflex port
    1.
    发明授权
    Loudspeaker system having a bass-reflex port 失效
    扬声器系统具有低音反射端口

    公开(公告)号:US06275597B1

    公开(公告)日:2001-08-14

    申请号:US09316982

    申请日:1999-05-24

    IPC分类号: H04R2500

    CPC分类号: H04R1/2826

    摘要: A loudspeaker system comprises an enclosure which accommodates a loudspeaker device and a bass-reflex port (105). The port has two open ends (105b, 105c) and a central area (c) provided with perforations (109), as well as a foam material (111) provided in and/or on the perforations.

    摘要翻译: 扬声器系统包括容纳扬声器装置和低音反射端口(105)的外壳。 该端口具有两个开口端(105b,105c)和设置有穿孔(109)的中心区域(c)以及设置在穿孔中和/或上的泡沫材料(111)。

    MRI apparatus with a mechanically integrated eddy current shield in the gradient system
    3.
    发明授权
    MRI apparatus with a mechanically integrated eddy current shield in the gradient system 失效
    在梯度系统中具有机械集成的涡流屏蔽的MRI装置

    公开(公告)号:US06326788B1

    公开(公告)日:2001-12-04

    申请号:US09428765

    申请日:1999-10-28

    IPC分类号: G01V300

    CPC分类号: G01R33/4215

    摘要: The MRI apparatus includes an actively shielded gradient system (40) with primary gradient coils and shielding coils (56). Despite the active shielding, such a system inevitably causes a magnetic field to some extent outside the shielding, so that eddy currents are generated in the conductive structures of the main magnet, said eddy currents causing heat dissipation and annoying noise. According to the invention, the gradient system also includes an eddy current shield (48) which consists of an electrically conductive, substantially closed plate; furthermore, the primary gradient coil (60) and the shielding coil (56) are arranged within the eddy current shield (48) and these three elements together constitute a mechanically rigid unit. As a result, eddy currents are avoided in the main magnet and annoying noise is strongly reduced.

    摘要翻译: MRI装置包括主屏蔽梯度系统(40),其具有主梯度线圈和屏蔽线圈(56)。 尽管主动屏蔽,但这种系统不可避免地会在屏蔽外部导致一定程度的磁场,从而在主磁体的导电结构中产生涡流,所述涡流引起散热和烦人的噪音。 根据本发明,梯度系统还包括由导电的基本封闭的板组成的涡流屏蔽(48) 此外,主梯度线圈(60)和屏蔽线圈(56)被布置在涡流屏蔽(48)内,并且这三个元件一起构成机械刚性单元。 结果,在主磁体中避免了涡流,大大降低了烦人的噪音。

    Loudspeaker system having a bass-reflex port
    5.
    发明授权
    Loudspeaker system having a bass-reflex port 失效
    扬声器系统具有低音反射端口

    公开(公告)号:US5892183A

    公开(公告)日:1999-04-06

    申请号:US31372

    申请日:1998-02-26

    IPC分类号: H04R1/02 H04R1/28 H05K5/00

    CPC分类号: H04R1/2826

    摘要: A loudspeaker system includes an enclosure (1) which accommodates a loudspeaker device (3) and a bass-reflex port (5) having two open ends (5b, 5c). The port has a longitudinal axis (5a) and a length (L) defined by the two open ends, and has a passage which flares towards the two open ends. This provides flared portions (5d, 5e) which extend over a substantial part of the length of the port. In order to minimize undesirable noises and distortions, the flared portions, in a longitudinal section of the port, have bounding lines (7) which extend at an angle .alpha. having a value of between 3.degree. and 12.degree. with respect to the longitudinal axis of the port.

    摘要翻译: 扬声器系统包括容纳扬声器装置(3)和具有两个开口端(5b,5c)的低音反射端口(5)的外壳(1)。 该端口具有由两个开口端限定的纵向轴线(5a)和长度(L),并且具有朝向两个开放端部向外展开的通道。 这提供了在端口的长度的大部分上延伸的扩口部分(5d,5e)。 为了最小化不期望的噪声和变形,在端口的纵向部分中的扩口部分具有边界线(7),其以相对于纵向轴线的纵向轴线的角度α以3°和12°的角度延伸 港口。