发明授权
- 专利标题: Acoustic apparatus
- 专利标题(中): 声学仪器
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申请号: US927687申请日: 1978-07-25
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公开(公告)号: US4256198A公开(公告)日: 1981-03-17
- 发明人: Yasushi Kawakami , Hiroshi Iwasaki
- 申请人: Yasushi Kawakami , Hiroshi Iwasaki
- 申请人地址: JPX Yokohama
- 专利权人: Nissan Motor Company, Limited
- 当前专利权人: Nissan Motor Company, Limited
- 当前专利权人地址: JPX Yokohama
- 优先权: JPX52/105280[U] 19770806
- 主分类号: H04R9/06
- IPC分类号: H04R9/06 ; G10K11/16 ; H04R1/02 ; H04R1/22 ; H04R1/28 ; H04R7/00
摘要:
A loudspeaker having a framework with a plurality of openings therein is fitted with an elastic body of a bitumen-containing urethane foam over the rearside of the framework to absorb the acoustic energy transmitted rearwardly from the speaker.
公开/授权文献
- US6108058A Field sequential Pi cell LCD with compensator 公开/授权日:2000-08-22
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