Coil transducer
OwnerDennis R. Gunninventor
Life of this patent
Estimating the term…
Abstract
In a contact mike, a pair of coils are formed so as to be directly connected to the resonating surface of a musical instrument or other vibrating object. The coils are coaxial and oppositely wound such that a single space is defined at their common center. A magnet is resiliently suspended within the coils and is resiliently isolated from the vibration of the resonating surface. Since the coils vibrate in the vicinity of the magnet, which remains relatively stationary due to its own inertia, an alternating current is induced in the coils which anologues the vibrations of the surface. In one embodiment the resonating member of the instrument itself is used to form part of the resilient connection between the magnet and the coil.
Claims29
A transducer for producing an alternating current electrical signal corresponding to the vibrations of a vibrating member to be miked comprising:
- a coil, said coil being rigidly coupled to said vibrating member so as to be synchronously vibratable therewith, said coil consisting of a plurality of turns of a conductive filament;
- a magnet, said magnet being resiliently suspended within said coil so as to be isolated from the vibrations of said vibrating member;
- a resilient member, said resilient member defining means for supportively and elastically coupling said magnet to said coil for insulating said magnet from vibration of said coil and said vibrating member, and for allowing relative movement between said magnet and coil for electro-inductively producing said alternating current signal in said coil, in response to vibration of coil due to vibration of said vibrating member.
A contact microphone comprising:
- a rigid coil, said rigid coil being of electrically conductive material, said rigid coil defining an enclosed space of a first length measured along an axis normal to the windings of said coil, for being coupled to a vibrating surface so as to vibrate therewith;
- a magnet, said magnet having a smaller length between ends defining its poles than said first length;
- a first resilient member, said first resilient member being attached to one end of said coil for supporting one end of said magnet at a central portion thereof;
- and
- a second resilient member, said second resilient member being attached to the other end of said magnet at a central portion thereof for cooperating with said first resilient member to retain said magnet in alignment within said coil and isolated from vibrations of said vibrating member along the north-south axis of said magnet.
A contact microphone comprising:
- a transducer element for contacting a surface of an instrument so as to vibrate therewith;
- a holder means, said holder means having an adhesive portion for adhering to a surface to be miked;
- a resilient depressor means, said resilient depressor means being elastically distorted when said adhesive portion is caused to adhere to said surface to be miked, said resilient depressor means defining means for resiliently urging said transducer element into rigid contact with said surface to be miked.
A transducer for producing an alternating current signal corresponding to the vibrations of a vibrating member to be miked comprising:
- a coil, said coil consisting of a plurality of turns of a conductive filament;
- a magnet surrounded by said coil;
- and
- resonant electronic element support means, said resonant electronic element support means supporting one of said magnet and said coil so as to allow relative movement between said magnet and said coil in response to vibration of said vibrating member, said electronic element support means being defined by a resilient resonator member by which said magnet and said coil are elastically coupled to each other, said resilient resonator member being operable for modulating the vibration of said coil relative to said magnet for determining the tonal characteristic of the signal output of said transducer.
A transducer for producing an alternating current signal corresponding to the vibrations of a vibrating member of a musical instrument comprising:
- a coil, said coil consisting of a plurality of turns of a conductive filament;
- a magnet, said magnet being surrounded by said coil;
- saddle support means, said saddle support means resiliently supporting a vibrating member of said musical instrument;
- and
- electronic element support means, said electronic element supporting means supporting one of said magnet and said coil so as to allow relative movement between said magnet and said coil in response to vibration of said vibrating member, said saddle support means and said electronic element support means being defined by in common a resilient resonator member by which one of said magnet and said coil is supportively elastically coupled to a substantially rigid support structure and said substantially rigid support structure supports the other one of said coil and said magnet.
Dependencies are inferred from the claim text.