Piezoelectric signal generator

摘要

The piezoelectric signal generator (10;30) includes at least one piezoelectric element (12;20) connected with an emitter (14;35) which is capable of generating, from a current (C) produced by actuation of the piezoelectric element, an electromagnetic signal (S) capable of being wirelessly received by a receiver (16;36) removed from the signal generator (10;30), the piezoelectric element (20;31) comprises a piezoceramic layer (241) attached to an electrically conducting carrier stratum (242); the piezoceramic layer adheres to the carrier stratum and both are held by a positioning layer (23) which has a thickness (TP), and both are capable of a reversible deformation, predetermined by and limited to the thickness (TP) of the positioning layer (23); further, the piezoelectric element (20;31) comprises a gap layer (26) for buffering the reversible deformation of the carrier stratum (242) with the adhering piezoceramic layer (241); the gap (29) has a thickness (TG) such that TG≦TP.

主权项

1. A piezoelectric signal generator (10;30) including at least one piezoelectric element (12;20) operatively connected with an emitter (14;35) for generating, from a current (C) produced by actuation of said at least one piezoelectric element, an electromagnetic signal (S) being wirelessly received by a receiver (16;36) removed from said signal generator (10;30); wherein said at least one piezoelectric element (20;31) comprises a piezoceramic layer (241) adhering to an electrically conducting carrier stratum (242), each of said piezoceramic layer (241) and said electrically conducting carrier stratum (242) being substantially planar, wherein the periphery of the piezoceramic layer (241) and of the electrically conducting carrier stratum (242) are each fixedly held by a positioning layer (23) having a thickness (TP), thereby preventing movement of the periphery of the piezoceramic layer (241) and the electrically conducting carrier stratum (242) at the positioning layer (23); said electrically conducting carrier stratum (242) together with said adhering piezoceramic layer (241) being configured for reversible deformation; and said piezoelectric element (20;31) comprising a gap layer (26) positioned next to the piezoceramic layer (241) adhering to the electrically conducting carrier stratum (242) for limiting said reversible deformation by means of a gap (29) having a thickness (TG) such that TG