公开(公告)号：US4884262A

公开(公告)日：1989-11-28

申请号：US78524

申请日：1987-07-17

Applicant: Jan Larsen ,  Robert Gudmandsen ,  Per Winfeld

Inventor： Jan Larsen ,  Robert Gudmandsen ,  Per Winfeld

IPC: H04R9/12 ,  H04R9/16

CPC classification number: H04R9/16

Abstract: In a stereo pick-up having movable coils (14) and an SmCo magnet (22) with a high energy content, with the coil system (14, 15, 18) arranged in front of one pole face of said magnet, a yoke plate (23) of a magnetic soft material is arranged in front of said system to increase the magnetic induction in the coils. The great coercive force of the magnet is utilized for simplifying and reducing the costs of the mechanical structure in that the yoke plate is formed with two legs (26) which extend rearwardly, engage and are secured to two opposite sides of the magnet. The short-circuit of the magnet established by these legs has no noticeable impact on the induction in the air gap because of the high coercive force of the magnet. The manufacturing costs of the magnet system are additionally reduced in that, instead of a hole to receive a mounting assembly (16) for the coil system, the magnet, whose material is very hard, is formed in its underside with a slot (30) in whose bottom the mounting assembly is arranged and secured by means of a plate-shaped projection (31) on a casing member (32) of plastics.

Abstract translation: PCT No.PCT / DK86 / 00127 Sec。 371日期1987年7月17日 102（e）1987年7月17日PCT PCT 1986年11月18日PCT公布。 公开号WO87 / 03157 日期：1987年5月21日。在具有可动线圈（14）和具有高能量含量的SmCo磁体（22）的立体声拾取器中，线圈系统（14,15,18）布置在 所述磁体，磁性软材料的轭板（23）布置在所述系统的前面，以增加线圈中的磁感应。 为了简化和降低机械结构的成本，利用了磁铁的很大的矫顽力，因为磁轭板形成有两个向后延伸的接合并固定在磁体的两个相对侧上的两个腿部26。 由于磁铁的高矫顽力，由这些腿构成的磁体的短路对气隙的感应没有明显的影响。 磁体系统的制造成本进一步降低，代替用于接收用于线圈系统的安装组件（16）的孔，其材料非常硬的磁体在其下侧形成有槽（30）， 在其底部，安装组件通过塑料的壳体构件（32）上的板形突起（31）布置和固定。