Patent ID: 7649305

Claim:
An energy harvesting apparatus comprising at least three elongated piezoelectric elements for generating a voltage when strained, each element having an axis extending along its length; each element supported for flexing comparatively easily within a predetermined bending plane as compared to other planes in which its axis lays; a first one of the at least three piezoelectric elements being mounted with its predetermined bending plane facing a first direction, a second one of the at least three piezoelectric elements being mounted with its predetermined bending plane facing in a second direction, and a third one of the at least three piezoelectric elements being mounted with its predetermined bending plane facing a third direction; the first, second and third directions being non-parallel, wherein the at least three elongated, elements comprise a first array of cantilevered, elongated piezoelectric elements with axes oriented in the first direction, a second array of cantilevered, elongated piezoelectric elements with axes oriented in the second direction, and a third array of cantilevered, elongated piezoelectric elements with axes oriented in the third direction, wherein the at least three elongated elements include a sensitivity to at least two different frequencies.