Transducer and method for forming a transducer
AssigneeB-Band Oy
InventorHeikki Eero Raisanen
Life of this patent
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Abstract
Transducer for converting mechanical stress into electric signals, which transducer is composed of at least one electromechanical sheet and is capable of converting mechanical stress into electric signals and in which transducer at least one of the electrodes required by the electromechanical sheet is disposed on the surface of one or more thin and flexible dielectric materials, said electrodes forming electrically conductive surfaces of the transducer for connecting the transducer to a signal processing device, and which transducer is constructed of a unitary, thin and flexible layered sheet structure and has the same width throughout its length.
Claims38
Transducer for converting mechanical stress into electric signals, said transducer comprising:
- a transducer part and a connection part;
- at least one transducer element with a first and a second side;
- at least one dielectric layer at least on the first side of the transducer element;
- at least one signal electrode, said signal electrode being arranged in between the transducer element and the dielectric layer;
- at least one ground electrode being arranged on the second side of the transducer element;
- wherein the transducer element is a dielectric electret film containing a permanent electric charge;
- wherein the transducer part has a unitary laminated structure;
- and
- wherein the signal electrode is on the first side of the dielectric layer, between the dielectric layer and the transducer element, and the ground electrode is on the second side of the dielectric layer, and
- wherein said electrodes continue unitary from the transducer part as a connection part for connecting the transducer to a signal processing device.
Transducer for converting vibrations into electric signals, said transducer comprising:
- at least one transducer element;
- at least one dielectric film on at least one side of the transducer element;
- at least one signal electrode;
- at least one ground electrode;
- a transducer part and a connection part;
- wherein the signal electrode layer is arranged in between the dielectric film and transducer element, and
- the transducer element contains at least one permanently charged dielectric electret film.
Transducer for converting mechanical stress into electric signals, said transducer comprising:
- at least one transducer element;
- at least one dielectric layer on at least one side of the transducer element;
- at least one signal electrode;
- and
- at least one ground electrode, the transducer having a transducer part and a connection part;
- wherein the transducer element is comprising at least one charged electret film;
- where at least the signal electrode is arranged between the dielectric layer and transducer element;
- and
- where the signal electrode is essentially inside the transducer structure in order to reduce the electromagnetic interference.
Method for forming a transducer for transforming mechanical stress into electric signals, said transducer comprising:
- at least one transducer element;
- at least one dielectric film on at least one side of the transducer element;
- at least one signal electrode, said signal electrode arranged in between the dielectric film and transducer element;
- at least one ground electrode;
- a transducer part;
- a connection part;
- wherein the transducer element is comprised of at least one electret film containing a permanent electric charge;
- forming said electrodes on one or more dielectric films or on transducer element material side by side;
- and
- gluing the dielectric films and the transducer element material against each other so that the charged electromechanical transducer film is placed in a desired area, said electrodes forming one or more electrically conductive surfaces required at each transducer.
Transducer for converting mechanical stress into electric signals, said transducer comprising:
- at least two transducer elements, said elements having first and second surfaces;
- at least one signal electrode layer arranged between two transducer elements, said signal electrode layer being a conductive layer arranged in between the first surfaces of the two transducer film elements;
- and
- at least two ground electrode layers, said ground electrode layers being conductive layers arranged against the second sides of the transducer film elements;
- and said electrodes extend from the transducer part as connection part for connecting the transducer to a signal processing device;
- and
- wherein transducer elements are permanently charged dielectric electret films.
Method for forming a transducer comprising following steps:
- arranging at least one signal electrode layer against first surface of a transducer film element;
- arranging at least one signal electrode layer between first surfaces of two transducer elements, the signal electrode layer being a conductive layer;
- and
- arranging ground electrode layers against second surfaces of said transducer film elements;
- wherein transducer part has a unitary laminated structure;
- and
- wherein the transducer elements are permanently charged electret films.
Dependencies are inferred from the claim text.