| 摘要 |
PROBLEM TO BE SOLVED: To provide an absorbing body capable of absorbing sound in a wide frequency range, being thin, and having electromagnetic shield characteristics and improved thermal conductivity.SOLUTION: A composite sound absorbing sheet 100 has a fine perforated film 102, and a perforated metallic foil 104 arranged on the fine perforated film 102. The fine perforated film 102 has through fine holes 106. The through fine holes 106 exist to form a first pattern, and completely penetrate the film 102. The perforated metallic foil 104 has holes 108 to form a second pattern. The first pattern of the through fine holes 106 on the fine perforated film 102 and the second pattern of the holes 108 on the perforated metallic foil 104 have a non-alignment pattern. The composite sound absorbing sheet 100 may have a cavity between at least a part of the fine perforated film 102 and at a part of the perforated metallic foil 104. The perforated metallic foil 104 is embossed. |
