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发明名称
Stiffness variation device
摘要
This invention relates to an electromechanical apparatus for varying stiffness and is especially useful in electrodynamic systems, such as electrodynamic loudspeakers, to improve their low frequency response.
申请公布号
US4243838(A)
申请公布日期
1981.01.06
申请号
US19780936282
申请日期
1978.08.23
申请人
COFFEY, DENNIS K.
发明人
COFFEY, DENNIS K.
分类号
H04R9/02;H04R9/06;(IPC1-7):H04M1/00;H04R9/00
主分类号
H04R9/02
代理机构
代理人
主权项
地址
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