公开(公告)号：EP0698298A4

公开(公告)日：1997-08-13

申请号：EP94914908

申请日：1994-05-04

申请人： NOISE CANCELLATION TECH

发明人： HILDEBRAND STEPHEN

IPC分类号： H01L41/09 ,  H01L41/08

CPC分类号： H01L41/0973 ,  H01L41/098

摘要： A low voltage bender piezo-actuator with multiple, same size piezo layers (11, 12) separated by thin electrically conductive strips (14) and adapted to be affixed to a rigid, vibration transmitting plate (10) to produce noise counter vibrations to prevent noise from passing through the plate.

公开(公告)号：EP0746843A4

公开(公告)日：1998-12-09

申请号：EP94926620

申请日：1994-09-02

申请人： NOISE CANCELLATION TECH

发明人： HILDEBRAND STEPHEN ,  HU ZIQIANG

IPC分类号： G10K11/178 ,  H01F27/02 ,  H01F27/33 ,  G10K11/16

CPC分类号： H01F27/33 ,  G10K11/178 ,  G10K2210/106 ,  G10K2210/1082 ,  G10K2210/119 ,  G10K2210/125 ,  G10K2210/1291 ,  G10K2210/3016 ,  G10K2210/3027 ,  G10K2210/3036 ,  G10K2210/3042 ,  G10K2210/3046 ,  G10K2210/3212 ,  G10K2210/3214 ,  G10K2210/3216 ,  G10K2210/3219 ,  G10K2210/3229 ,  G10K2210/32291 ,  G10K2210/501

摘要： The present invention relates generally to global noise or sound control and, more particularly, to the control or sound radiated from stationary induction apparatus such as power transformers and shunt reactors by use of active enclosures and active panels. The purpose of the invention is to markedly reduce the radiation of sound from the machine to all observation points in the surrounding field with a very lightweight, compact, non-airtight structure which does not impair maintenance or repair of the machine.