ACOUSTIC DIAPHRAGM, METHOD FOR PRODUCING THE SAME, SPEAKER, HEADPHONE, AND EARPHONE

摘要

PROBLEM TO BE SOLVED: To provide an acoustic diaphragm which can be manufactured at low cost and which is capable of increasing internal loss in spite of light weight.

SOLUTION: An acoustic diaphragm has elastic-modulus anisotropy. The acoustic diaphragm is constituted of a first resin layer and a second resin layer. The second resin layer is formed covering one principal surface of the first resin layer, and a plurality of structures on the surface extend to at least one-dimensional direction. The thickness of the second resin layer is 20-60% of the whole thickness. Among the plurality of structures, the depth of a concavity formed between adjacent structures or the depth of a concavity of a structure is 70-95% of the thickness of the second resin layer. The arrangement pitch of the plurality of structures is 5-100 μm.

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