| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a pair of earphones capable of setting any sound quality by finely changing acoustic properties even if the pair of earphones is an insertion type and further of suppressing an increase in cost. <P>SOLUTION: A pair of earphones comprises: loudspeakers (SP); housings (HS) that have acoustic tubes (1a) cylindrically projecting and accommodate the loudspeakers (SP) therein; outer cylindrical portions (5) that have male screw portions (1c) formed on outer peripheral surfaces of the acoustic tubes (1a) and female screw portions (5c) to be engaged with the male screw portions (1c) and are installed so as to cover the acoustic tubes (1a) in such a manner that positions thereof in directions of axes (CL1) with respect to the acoustic tubes (1a) are caused to be variable; filters (7) disposed at positions in the outer cylindrical portions (5) opposite to openings (1b1) of the acoustic tubes (1a); and lock rings (4) that are engaged with the male screw portions (1c) at housings (HS) sides than outer cylindrical portions (5) sides in such a manner that positions thereof in the directions of the axes (CL1) with respect to the acoustic tubes (1a) are caused to be variable and regulate movement of the outer cylindrical portions (5) by tightening the outer cylindrical portions (5). <P>COPYRIGHT: (C)2012,JPO&INPIT |
