DIFFERENTIAL MICROPHONE

摘要

A differential microphone (110A) includes a case (611) having a first space and a second space arranged inside; and a first oscillation film (113A) arranged inside the case (611).  The case (611) has a first opening (611A) for communication between the first space and outside and a second opening (611B) for communication between the second space and outside.  A dimension in a first direction which is vertical to the straight line passing through the centers of the two openings (611A, 611B) is longer than a dimension in a second direction which is parallel to the straight line passing through the center of the two openings.