| 摘要 |
PROBLEM TO BE SOLVED: To obtain a sealed headphone that obtains larger blocking effects even to low-frequency external noise. SOLUTION: The headphone is provided with a headphone unit 5, a housing 2 for covering the rear-face side of the headphone unit 5, a rear air chamber 10 surrounded by the rear-face side of the headphone unit 5 and the housing 2, and a first acoustic mass part 21 that allows the rear air chamber 10 to communicate with the outside. A cylindrical second acoustic mass part 8 is provided protrudingly toward the rear air chamber 10 so as to allow an internal air chamber of the headphone unit 5 to communicate with the rear air chamber 10. An acoustic resistor 6 is also provided so as to allow the internal air chamber of the headphone unit 5 to communicate with the rear air chamber 10. An acoustic impedance comprising the second acoustic mass part 8 and the acoustic resistor 6 is higher than that of the rear air chamber 10. COPYRIGHT: (C)2010,JPO&INPIT
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