Filter unit for use as e.g. listener filter for in-ear hearing system, has aperture exhibiting body part and filter gauze inserted into sound-transmissive aperture, where filter gauze includes hydrophobic or hydrophobic coated material

摘要

The filter unit (3) has a sound-transmissive aperture exhibiting a body part and a filter gauze (3b) inserted into the sound-transmissive aperture, where the filter gauze includes a hydrophobic or hydrophobic coated material. The filter gauze is formed as a lattice or net-like structure and made to contact with a material of the body part through injection. The hydrophobic materials are used for forming and/or coating the filter gauze of the filter unit. The body part is designed in form of a plastic ring.