Coaxial musical instrument transducer
AssigneeFishman Transducers, Inc.
InventorLawrence R. Fishman
Life of this patent
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Abstract
A transducer for a stringed musical instrument utilizes a coaxial structure. An electromechanical film tape is disposed about an inner, electrically conductive core. An outer conductor is formed about the electromechanical film tape. The electromechanical film tape may be provided as a piezoelectric polymer film or an electret film having a permanent electric charge, and is formed about the inner core by wrapping or braiding. Prior to being disposed about the inner core, the film tape may be polarized through the application of a direct current through the film to substantially align the electrical domains in the film. The transducer is configured for placement underneath the saddle in a bridge of a stringed musical instrument.
Claims41
A musical instrument transducer comprising:
- an inner conductor comprising electrically conductive material;
- an electrically active transducer layer about the inner conductor, wherein the electrically active transducer layer is provided in the form of a film tape;
- and
- an outer conductor, comprising electrically conductive material, disposed about the electrically active transducer layer.
A musical instrument transducer comprising:
- an inner conductor comprising electrically conductive material;
- an electret film layer about the inner conductor, wherein the electret film layer is provided in the form of an electret film tape having a permanent electric charge;
- and
- an outer conductor, comprising electrically conductive material, disposed about the electret film layer.
A method of fabricating a musical instrument transducer, comprising the steps of:
- providing an electrically conductive central core;
- providing an electrically active transducer layer in the form of a film tape about said electrically conductive central core;
- forming an electrically conductive outer layer about said film tape to produce an assembly;
- cutting said assembly to a desired length;
- and
- disposing electrically conductive leads in communication with said electrically conductive central core and said electrically conductive outer layer.
A method of fabricating a musical instrument transducer, comprising the steps of:
- providing an electrically conductive central core;
- providing an electret film tape having a permanent electric charge about said electrically conductive central core;
- forming an electrically conductive outer layer about said electret film tape to produce an assembly;
- cutting said assembly to a desired length;
- and
- disposing electrically conductive leads in communication with said electrically conductive central core and said electrically conductive outer layer.
Dependencies are inferred from the claim text.