ANTI-NOISE HEAD PHONES (VERSIONS) Russian patent published in 2007 - IPC A61F11/06 A42B1/06 A42B3/16 G01K11/00 

FIELD: safety engineering.

SUBSTANCE: anti-noise head phone can be used as aid for protection ears of human against hazardous influence of excess noise. Anti-noise head phones have headband, case with protector, made of material with magnetic properties, and noise-absorbing facing. According to first version, as noise-absorbing facing the plates made of mineral on basalt base cotton, like "Rockwool", can be used, as well as mineral cotton "URSA", either basalt cotton P-75, or glass cotton provided with facing made of glass felt, or foamed polymer like polyethylene or polypropylene. Sound-absorbing element has its total surface faced by acoustic transparent material, for example, with glass tissue of EZ-100 type or "Povyden". According to second version, plates on base of aluminum-containing alloys can be used which plates are filled with titanium hydride or with air at density within 0,5-0,9 kg/m3 to have the following properties: compression strength is within 5-10 MPa, bent strength is within 10-20 MPa. For the third version, members made of solid porous noise-absorbing material are used as noise-absorbing facing, which are namely foamed aluminum or metal ceramics, either metal plastics, or shell rocks with degree of porosity being within 30-45% range. According to fourth version, members with layer-by-layer reeling of porous threads, reeled upon acoustic transparent frame, like wire frame, are used. According to fifth version, crunches of solid vibration damping materials are used, for example, elastomer, polyurethane, or "Agat", "Antivibrit", "Shwim" type flexible PVC. Size of fractions of crunch is 0,3-2,5 mm.

EFFECT: higher noise protection.

5 cl, 3 dwg