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1. 发明授权

US4374433A Stereo pickup with printed circuit coils mounted in a linear field 失效
标题翻译：具有安装在线性场中的印刷电路线圈的立体声拾取器
公开(公告)号：US4374433A
公开(公告)日：1983-02-15
申请号：US122261
申请日：1980-02-19
申请人： Hiroshi Ogawa , Kazuhiro Sato , Norio Shibata , Katsuhiko Oguri , Masayoshi Utida , Tsuyoshi Ono
发明人： Hiroshi Ogawa , Kazuhiro Sato , Norio Shibata , Katsuhiko Oguri , Masayoshi Utida , Tsuyoshi Ono
IPC分类号： H04R9/16 , H04R9/04
CPC分类号： H04R9/16
摘要： A moving-coil type stereo pickup cartridge comprises a vibration mechanism, including a stylus for tracing the groove of a sound track on a record disc, at least one coil plate provided in the vibration system and adapted to vibrate in response to vibrations of the stylus, and a structure for forming a magnetic field for the coil plate. The coil plate comprises a thin insulative substrate and a pair of left and right coils substantially symmetric with respect to a center line and formed by an electrically conductive thin film placed in a spirally wound pattern on at least one surface of the substrate. The magnetic field-forming construction comprises a permanent magnet and a pair of yokes adapted to clamp the permanent magnet. The pair of yokes have confronting surfaces for defining a gap in which the coil plate is interposed and a recessed substantially reverse V-shaped notch or cutout. The notch is defined by edge parts or facets. The configuration of the edge parts is such that the contour lines of the density of the leakage magnetic flux at least within the space confronting the coils and in the notch extend substantially at angles of plus and minus 45.degree. to the center line.
摘要翻译：动圈式立体拾音盒包括振动机构，其包括用于跟踪记录盘上的声轨的凹槽的触针，设置在振动系统中的至少一个线圈板，并且响应于触针的振动而振动以及用于形成用于线圈板的磁场的结构。线圈板包括薄绝缘基板和一对左右线圈，其相对于中心线基本对称，并且由在基板的至少一个表面上以螺旋卷绕的图案放置的导电薄膜形成。磁场形成结构包括永磁体和适于夹紧永磁体的一对磁轭。一对轭具有用于限定线圈板插入的间隙的面对面以及凹入的大致相反的V形凹口或切口。凹口由边缘部分或小面定义。边缘部分的构造使得至少在线圈和凹口内的空间内的泄漏磁通密度的轮廓线基本上以与中心线正+ 45度的角度延伸。

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