DUAL-DIAPHRAGM ACOUSTIC TRANSDUCER

摘要

A dual-diaphragm acoustic transducer includes a substrate defining an opening, an inner diaphragm and an outer diaphragm concentrically mounted at one same side of the substrate corresponding to the opening of the substrate, and a plurality of elastic supporting members connected between the outer perimeter of the inner diaphragm and the inner perimeter of the outer diaphragm. Thus, when a sound wave enters the opening of the substrate, the sound wave pressure forces the outer diaphragm to displace and to carry the inner diaphragm to move, and the inner diaphragm itself will also be forced by the sound wave pressure to have a larger displacement than the outer diaphragm, enhancing the sensitivity. Further, using the inner and outer diaphragms to respond to different sound wave pressures can enhance the sound wave pressure sensing range.

主权项

1. A dual-diaphragm acoustic transducer, comprising:
a substrate comprising a first side, a second side opposite to said first side, and an opening cut through said first side and said second side; a sound wave sensing unit mounted at said first side of said substrate corresponding to said opening, said sound wave sensing unit comprising an inner diaphragm and an outer diaphragm surround said inner diaphragm; and a support unit comprising at least two first elastic supporting members connected between said inner diaphragm and said outer diaphragm of said sound wave sensing unit.