Patents Assigned to Nippon Chem-Con Corp.
  • Electroacoustic transducer
    Patent number: 4637489
    Abstract: An electroacoustic transducer has a front air chamber in front of the diaphragm that vibrates upon receiving sound waves or produces sound waves upon vibration and a back air chamber provided in the rear of the diaphragm. The electroacoustic transducer of the present invention further includes an auxiliary air chamber that is provided in the rear of the back air chamber that is coupled thereto by through holes. The auxiliary air chamber is divided into at least two smaller air chambers which are coupled to each other by a small orifice.
    Type: Grant
    Filed: September 4, 1985
    Date of Patent: January 20, 1987
    Assignees: Nippon Chem-Con Corp., Hideo Koide
    Inventors: Masaya Iwanaka, Seiji Kajiwara