Patent ID: 9560430
Date: 2017-01-31
CPC Classifications: B81B,H04R

Claim:
1. A waterproof structure comprising: a housing; an electroacoustic transducer that includes a case having a leading end face formed with tone holes; a packing that is interposed between the housing and the electroacoustic transducer, and includes a thin film part on a part opposed to the tone holes and a cylindrical base having one end side which is closed by the thin film part; and an annular member that is interposed between the thin film part and the leading end face of the case without contacting an inner surface of the base of the packing and surrounds the tone holes, wherein a first space surrounded by the thin film part, the annular member and the case, and a second space surrounded by the thin film part, the annular member, the case and the inner surface of the base are formed by fitting the electroacoustic transducer into the base, and wherein the case biases the annular member to push up the thin film part of the packing by fitting on the electroacoustic transducer more deeply such that a constant tension is generated on a portion of the thin film part surrounded by the annular member.