| US 7,589,439 B2 | ||
| Electromechanical transducer element, method for forming an electromechanical transducer element and transducer formed by said method | ||
| Heikki Raisanen, Jyvaskyla (Finland) | ||
| Assigned to B-Band Oy, Vaajakoski (Finland) | ||
| Filed on Jul. 14, 2004, as Appl. No. 10/894,417. | ||
| Application 10/894417 is a continuation of application No. PCT/FI03/00035, filed on Jan. 17, 2003. | ||
| Claims priority of application No. 20020092 (FI), filed on Jan. 17, 2002. | ||
| Prior Publication US 2005/0035683 A1, Feb. 17, 2005 | ||
| Int. Cl. G11C 13/02 (2006.01) | ||
| U.S. Cl. 307—400 | 16 Claims |
| 1. Electromechanical transducer element for converting mechanical force changes into electrical signals, the transducer having
a layered structure and comprising:
a signal layer and at least one ground layer (103-105, 107) and dielectric layers comprising at least one charged elastic cellular electret film layer;
a plurality of embossing structures essentially smaller than the signal and ground electrode layers in order to improve the
electric properties, the embossing structures being separate structures from the signal and ground layers;
the plurality of embossing structures sandwiching the at least one charged elastic cellular electret film layer and at least
one electrode layer at certain areas essentially smaller than the signal and ground electrode layers, the plurality of embossing
structures arranged under pressure in order to compress the at least one charged elastic cellular electret film layer most
at the plurality of embossing structures and less elsewhere, and
wherein the plurality of embossing structures comprises a dielectric or electrically conducting material.
|