Patents Assigned to Soei Electric Co., Ltd.
  • Bifunctional earphone set
    Patent number: 5430803
    Abstract: In construction of an earphone set incorporating a vibratory membrane accompanied with a ceramic wafer, a coactive magnetic electroacoustic conversion is arranged facing the vibratory membrane in a manner such that the vibratory membrane reproduces human voices on receipt of corresponding electric acoustic signals whereas the conversion unit issues electric acoustic signals on collection of corresponding human voices at the vibratory membrane.
    Type: Grant
    Filed: March 19, 1993
    Date of Patent: July 4, 1995
    Assignee: Soei Electric Co., Ltd.
    Inventors: Hirofumi Kimura, Masakiyo Ohsako