发明授权
US3999845A Mechanical sound reproducing means for an audio-visual device 失效
用于视听设备的机械声音再现装置

  • 专利标题: Mechanical sound reproducing means for an audio-visual device
  • 专利标题(中): 用于视听设备的机械声音再现装置
  • 申请号: US476733
    申请日: 1974-06-05
  • 公开(公告)号: US3999845A
    公开(公告)日: 1976-12-28
  • 发明人: Anatoli Brushenko
  • 申请人: Anatoli Brushenko
  • 申请人地址: NY New York
  • 专利权人: GAF Corporation
  • 当前专利权人: GAF Corporation
  • 当前专利权人地址: NY New York
  • 主分类号: G03B31/06
  • IPC分类号: G03B31/06 G10K13/00 G11B25/04
Mechanical sound reproducing means for an audio-visual device
摘要:
A tone-arm generally in the form of a unitary right-angle member has first and second arms extending at approximately 90.degree. to each other. A needle is supported by one of the arms, the other arm being connected to a stem which is in turn connected to the speaker diaphram for vibrating the latter when the tone-arm is vibrated in its own plane as a consequence of the needle engaging the grooves of a phonograph record. A fulcrum supports the tone-arm for pivoting movement in its own plane; this fulcrum also permits the arm supporting the needle to move in a second plane parallel with the record. Spring means hold the tone-arm in engagement with the fulcrum and at the same time maintain the needle in engagement with the record. A camming means operated by advancing mechanism for a transparency holder separates the needle from the record during indexing of the needle to the separate successive messages on the record. The speaker diaphram is supported by special mounting means to permit large bodily movements of the diaphram occasioned by separation of the needle from the record.
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