Earphone device and sound generating apparatus equipped with the same

摘要

An external inserting meatus of user is closed with an insert earphone device (100) in use so that it is hard that external sound penetrates into the external inserting meatus; not only an internal sound propagation path (11) but also an external sound propagation path (13) are formed in an inserting body (10) of the earphone device (100), and an active diaphragm (12) is provided in the inserting body (10) so as to make the external sound propagation path (13) closed therewith and block the external auditory meatus from the external sound; the active diaphragm (12) is formed from electroactive polymer layer (12g) sandwiched between electrodes (12f/ 12h), and the active diaphragm (12) is deformed in the presence of voltage so as permit the user easily to control it.