公开(公告)号：US20040262802A1

公开(公告)日：2004-12-30

申请号：US10870957

申请日：2004-06-21

Applicant: JSP Corporation

Inventor： Kazuhiko Morita ,  Satoshi Iwasaki ,  Shinpei Arita

IPC: B29C044/24

CPC classification number: B32B27/32 ,  B29C44/22 ,  B32B5/18 ,  B32B27/065 ,  B32B27/18 ,  B32B27/22 ,  B32B37/153 ,  B32B2038/0084 ,  B32B2305/022 ,  B32B2307/21 ,  B32B2323/00

Abstract: A method of producing a composite sheet having a foam layer of a first polyolefin-based resin and a surface layer of a second polyolefin-based resin provided on at least one side of the foam layer and containing a polymeric antistatic agent. The method includes coextruding through die a first melt containing the first polyolefin-based resin and a physical blowing agent and a second melt containing the second polyolefin-based resin, the polymeric antistatic agent and a volatile plasticizer to obtain the composite sheet. The amount of the polymeric antistatic agent is 4 to 100 parts by weight per 100 parts by weight of the second polyolefin-based resin and the amount of the volatile plasticizer is 5 to 50 parts by weight per 100 parts by weight of a total amount of the second polyolefin-based resin and the polymeric antistatic agent. The second polyolefin-based resin has a crystallization temperature of Ta nullnull C.null and a melt viscosity of Ma nullPa.snull, while the polymeric antistatic agent has a crystallization temperature of Tb nullnull C.null and a melt viscosity of Mb nullPa.snull, wherein Ta, Tb, Ma and Mb satisfy the following conditions: Tb

公开(公告)号：US20010050194A1

公开(公告)日：2001-12-13

申请号：US09730742

申请日：2000-12-07

Applicant: JSP CORPORATION

Inventor： Yoshihisa Ishihara ,  Takeshi Aoki ,  Satoshi Iwasaki ,  Hirotoshi Kakuta

IPC: H04R007/00 ,  G10K013/00

CPC classification number: H04R7/00 ,  H04R2307/029

Abstract: The present invention provides a speaker unit comprising a diaphragm of 0.5 to 10 mm thick aromatic polycarbonate with a density of 0.03 to 0.6 g/cm3, and a mechanism for driving the diaphragm. The aromatic polycarbonate used for the diaphragm is preferably derived from bisphenol with a viscosity average molecular weight of 25,000 to 70,000. The invention further provides a speaker system comprising such a speaker unit attached to a cabinet and a method for manufacturing the speaker diaphragm.

Abstract translation: 本发明提供一种扬声器单元，其包括密度为0.03至0.6g / cm 3的0.5至10mm厚的芳族聚碳酸酯的隔膜和用于驱动隔膜的机构。 用于隔膜的芳族聚碳酸酯优选衍生自粘均分子量为25,000至70,000的双酚。 本发明还提供一种扬声器系统，其包括附接到机壳的扬声器单元和用于制造扬声器振膜的方法。