Patents Assigned to Eletro-Acustica S.A.
  • Electroacoustic piezoelectric transducer having a broad operating range
    Patent number: 4996713
    Abstract: An electroacoustic piezoelectric transducer comprises a concave diaphragm and at least two planar bimorph elements having different respective resonance frequency characteristics coupled to the diaphragm. The bimorph elements may comprise larger and smaller bimorph elements providing frequency responses in lower and higher frequency ranges respectively, and are preferably directly connected to the inner concave surface of the diaphragm.
    Type: Grant
    Filed: September 25, 1989
    Date of Patent: February 26, 1991
    Assignee: S. Eletro-Acustica S.A.
    Inventor: Helio T. Bittencourt
  • Tweeter
    Patent number: D289041
    Type: Grant
    Filed: July 13, 1984
    Date of Patent: March 31, 1987
    Assignee: Eletro-Acustica S.A.
    Inventor: Helio T. Bittencourt