Transducer with integrated sensor

摘要

An electroacoustic transducer includes a housing and a moving portion adapted to move relative to the housing. The moving portion has a first surface and includes a first electrode. A second electrode on a first surface of the housing is located proximate to a first region of the first electrode, and a third electrode on the first surface of the housing is located proximate to a second region of the first electrode. A capacitance between the first and second electrodes and a capacitance between the first and third electrodes vary similarly with displacement of the moving portion relative to the housing. An impedance buffer is coupled to the second electrode and the third electrode.

主权项

1. An electroacoustic transducer comprising:
a housing; a diaphragm located proximate to the housing, adapted to move relative to the housing; a motor adapted to cause the diaphragm to move relative to the housing in response to an input current, the motor comprising a voice coil and a magnet, one of the voice coil or the magnet mechanically coupled to the diaphragm and the other mechanically coupled to the housing, the movement of the diaphragm caused by the motor resulting in the transducer outputting acoustic energy; a displacement sensor comprising:
a first plate electrode adhered to the diaphragm,a second plate electrode on a first surface of the housing located proximate to a first region of the first plate electrode, anda third plate electrode on the first surface of the housing located proximate to a second region of the first plate electrode,wherein a first capacitance between the first plate electrode and the second plate electrode and a second capacitance between the first plate electrode and the third plate electrode each vary similarly with a displacement of the diaphragm relative to the housing caused by action of the motor or by external forces acting on the diaphragm; and an impedance buffer coupled to the second plate electrode and the third plate electrode.