| 摘要 |
PROBLEM TO BE SOLVED: To provide an air chamber having a large volumetric capacity, which is not limited by the size of a battery, in a thin housing.SOLUTION: A battery built-in headphone includes: a cover 12 including a sound emission part 15; an internal housing 13 forming an air chamber 18 between itself and the cover; a recessed part 13b provided within the internal housing; and a storage part 19 which houses a storage object at a side of the internal housing which is opposite to the cover. When the storage object is housed in the storage part, the storage object is disposed facing the recessed part.SELECTED DRAWING: Figure 2 |
