Earphone for use with e.g. personal digital assistant, has movable unit arranged on housing, and moving correspondingly with rear chamber for adjustment of volume, where movable unit has internal case arranged within chamber

摘要

The earphone (100) has a rear chamber (122) arranged between a loudspeaker unit (110) and a housing (120), where the size of the loudspeaker unit is suitable for inserting into an ear. A housing covers the loudspeaker unit, where the rear chamber is designed behind the loudspeaker unit. A movable unit (130) is arranged on the housing, and moves correspondingly with the chamber for adjustment of the volume. The movable unit has an internal case, which is arranged within the chamber.