ELECTRO-ACOUSTIC TRANSDUCER

摘要

A diaphragm (2) is supported on a substrate (1) having an opening. One plane of the diaphragm (2) faces the opening. A thin film coil (3) is a spiral coil having a flat plane shape wherein the coil goes around one axis. A yoke (5) is formed on a cover section (4), and a permanent magnet (6) is arranged at a center portion of the yoke (5). A space (7) is formed between the diaphragm (2) and the yoke (5). The thickness is reduced by forming the thin film coil (3) on the diaphragm (2). Since the space (7) between the permanent magnet (6) and the thin film coil (3) is small, a sufficient drive force for the diaphragm (2) can be obtained even with a small magnetic force. Thus, a thin, small and low-power consumption electro-acoustic transducer can be provided.