Piezoelectric Or Ferroelectric Patents (Class 381/173)
  • Ear microphone
    Patent number: 4696045
    Abstract: An ear microphone includes a bimorph piezoelectric transducer mounted on a PC board having an amplifier therein and surrounded by a helically wound spring. The piezoelectric transducer and spring are potted in a semi-soft potting compound which is formed in a shape adapted to be inserted into an external auditory ear canal to permit bone conduction to the microphone element. A cable is coupled to the amplifier through which a signal can be withdrawn for processing by electronic equipment.
    Type: Grant
    Filed: June 4, 1985
    Date of Patent: September 22, 1987
    Assignee: ACR Electronics
    Inventor: James M. Rosenthal
  • Electroacoustic transducer with piezoelectric diaphragm
    Patent number: 4692942
    Abstract: The invention relates to electroacoustic transducers and more particularly to microphones in which the conversion of an acoustic vibration into an electric voltage is provided by a piezoelectric diaphragm. The purpose of the invention is to allow transducers to be formed by mass production methods with a minimum of parts for providing the functions of embedment of the diaphragm, connections, screening, acoustic filtering and protection against damp and dust.
    Type: Grant
    Filed: October 23, 1985
    Date of Patent: September 8, 1987
    Assignee: Thomson CSF
    Inventor: Jean P. Morgand
  • Electroacoustic transducer and a method for manufacturing thereof
    Patent number: 4621171
    Abstract: An electroacoustic transducer includes a base plate made of insulating material, a stationary electrode formed on one side of the base plate and made of electrically conductive material, an annular support formed on the same side of the base plate and surrounding the stationary electrode, the annular support being made of the same electrically conductive material as the stationary electrode, and an electrically conductive diaphragm applied on the annular support.
    Type: Grant
    Filed: May 31, 1983
    Date of Patent: November 4, 1986
    Assignee: Tokoyo Shibaura Denki Kabushiki Kaisha
    Inventors: Hiroto Wada, Minoru Nishizono