| 摘要 |
PURPOSE: To effectively attenuate a penetrating external noise in a route which passes through between an outer shell and an inner shell filled with an elastomer material and goes towards an aperture part of an inside wall. CONSTITUTION: An ear cover or a ear protection cut 1 for headphone consists of a frame such as a cup and an elastic sealing ring 5 placed in an peripheral edge part of the frame, and this frame consists of an outer shell in a hard cup-shape and an inside wall. A layer 13 of the elastomer material is attached between the inside wall 6 and the outer shell in a compressed state. Several aperture parts 14 piercing the inside wall 6 are provided. A proper attenuating filter 15 having a porous structure is provided between the inside wall 6 and the elastic sealing ring 5. |
