| 摘要 |
PROBLEM TO BE SOLVED: To provide an earphone adapter by which acoustic characteristics of an open type and a dynamic earphone with a relatively large speaker can be fully utilized, and to provide an earphone equipped with it. SOLUTION: The earphone adapter 1 is cylindrical in form. Its left end 2 is loosely inserted into an ear canal 43 and its right end 3 is processed in accordance with the periphery of a speaker housing 21. The earphone adapter 1 is preferably made of rubber or soft resin and has an outer diameter and a thickness with which the whole periphery of the part 2 of smaller diameter makes close contact with the ear canal 43 and easily fits it when the part 2 is inserted in the ear canal 43. Its thickness is approximately 0.5 mm in consideration of the personal difference of the ear canal 43 and 2-3 types of adapters 1 having the outer diameter of the part 2 of a smaller diameter 2 of about 7 mm are provided. Also, the full length of the earphone adapter 1 is 20-40 mm. The length of the part 2 of a smaller diameter or/and the part 3 of a larger diameter may be adjusted by respectively cutting back in accordance with the state of the use of the earphone. COPYRIGHT: (C)2006,JPO&NCIPI
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