| 摘要 |
PROBLEM TO BE SOLVED: To modify sound to be absorbed without largely modifying a mass of the whole structure of a vibrator. SOLUTION: A sound absorption structure 1 is composed of a casing 10 and the vibrator 20. The vibrator 20 is composed of: a first member 21 formed of a synthetic resin having elasticity and a second member 22 formed of a synthetic resin having elasticity by making it a smaller Young's modulus than the first member 21. The first member 21 is fixed on a hole of a center part of the second member 22 to form the plate-like vibrator 20. Thus, when a Young's modulus of the center part of the vibrator 20 is larger than a peripheral edge part, sound to be absorbed is lowered compared with a case that the whole vibrator 20 is formed of a raw material in the form of a plate and the mass of the whole vibrator 20 is weighed to modify the sound to be absorbed. COPYRIGHT: (C)2009,JPO&INPIT
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