| 摘要 |
PROBLEM TO BE SOLVED: To provide an earphone which enables improvement of a sound pressure level at a low frequency band and achieves downsizing and weight reduction.SOLUTION: An earphone 1 includes: a housing which incorporates a piezoelectric speaker unit and has an opening part at a part thereof; a cylindrical part which is provided on the housing so as to enclose the opening part, protrudes outward, and narrows toward a tip; and an earpiece provided at a tip part of the cylindrical part. |
