| 摘要 |
<p>Disclosed is a microphone unit (1) including: an electro-acoustic conversion section (13) that converts sound pressure to an electrical signal; a casing (11) that accommodates the electro-acoustic conversion section (13); and a cover (12) that covers the casing (11) and is provided with a first acoustic opening (121) and a second acoustic opening (122). The casing (11) consists of a laminated substrate comprising integrated laminated layers. The casing (11) is provided with: a concave space (111) in which the electro-acoustic conversion section (13) is mounted and which communicates with the first acoustic opening (121), and a hollow space (121) that provides communication between a bottom face (111a) of the concave space and the second acoustic opening (122). Thus, the microphone unit (1) is provided with a first acoustic path (2) from the first acoustic opening (121) through the concave space (111) to a first face (132a) of a diaphragm (132), and a second acoustic path (3) from the second acoustic opening (122) through the hollow space (111) to a second face (132b) of the diaphragm (132).</p> |
