PROTECTIVE COVER ASSEMBLY HAVING SOUND TRANSMISSION CHARACTERISTICS

摘要

A sound-transmissive cover assembly (14) which provides protection from the ambient environment to transducers such as microphones, loudspeakers, buzzers, ringers, and other delicate devices; and across which sound energy can pass with very low attenuation. The cover assembly (14) has a protective membrane layer (22) and a porous support material layer (30) which are selectively bonded together at least in the outer region near their edges. An inner unbonded region surrounded by the bonded outer region is provided so that the protective membrane (22) and porous support layer (30) can vibrate or move independently in response to acoustic energy passing through them. An embodiment of the assembly includes at least one acoustic gasket (40) attached to one or both of the layers so as not to impede independent movement of the layers.