With Piezoelectric Microphone Patents (Class 381/114)
  • 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 A cable is coupled to the amplifier through which a signal can be withdrawn for processing by electronic equipment.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
  • Integrated electroacoustic transducer with built-in bias
    Patent number: 4524247
    Abstract: Disclosed is an electroacoustic transducer structure which can be formed in a semiconductor substrate and incorporated as part of an integrated circuit, and which provides a built-in dc bias for operation. An appropriate density of fixed charge is provided in an insulating layer adjacent to one of the electrodes in the gap between electrodes. Methods of manufacture are also disclosed including means for introducing the charge by contacting the insulating layer with a liquid medium, plasma charging, or by ion beam implanting into the layer.
    Type: Grant
    Filed: July 7, 1983
    Date of Patent: June 18, 1985
    Assignee: AT&T Bell Laboratories
    Inventors: W. Stewart Lindenberger, Tommy L. Poteat, James E. West