Acoustic transducer including airfoil for generating sound
AssigneeAliphCom
InventorThomas A. Donaldson
Life of this patent
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Abstract
Systems, apparatus, devices, and methods for converting electrical signals into sound using an acoustic transducer. The inventive acoustic transducer utilizes the motion of an airfoil shaped element to generate a sound wave, with the airfoil element being driven in response to an electrical signal input to a suitable driving element. In some embodiments, the airfoil element or elements act to mechanically couple the motion of an armature attached to the driver to the surrounding air, producing sound waves in a more efficient manner than typical acoustic transducer devices. Embodiments of the invention may be used in the design of loudspeakers, earpieces, headphones, and other devices for which a high efficiency transducer is desired.
Claims20
A transducer operative to generate an output acoustic wave, comprising:
- a source of airflow having an outlet;
- a plurality airfoil-shaped elements that are in line with one another, are spaced apart in fixed relation to one another, and connected in common with a bearing, the plurality of airfoil-shaped elements are movably positioned relative to the outlet so that air exiting the outlet flows predominantly along an upper camber surface of each airfoil-shaped element;
- and
- a driver operative to rotate all of the plurality of airfoil-shaped elements in response to an input signal, thereby causing an angle of attack between a leading edge of all of the plurality of airfoil-shaped elements and the air exiting the outlet to vary in response to the input signal.
A system for producing an acoustic wave, comprising:
- a source for an input signal;
- a source of airflow having an outlet;
- an airfoil-shaped element movably positioned relative to the outlet so that air exiting the outlet flows predominantly along an upper camber surface of the airfoil-shaped element;
- a driver operative to rotate the airfoil-shaped element in response to the input signal, thereby causing an angle of attack between a leading edge of the airfoil-shaped element and the air exiting the outlet to vary in response to the input signal;
- a static structure having a shape that is substantially that of an airfoil, wherein the airfoil shaped element rotates relative to the static structure in response to the input signal;
- an air inlet through which air may be supplied to an interior chamber of the static structure;
- and
- one or more vents, the vents providing an exit for air that is provided through the air inlet into the interior chamber of the structure, and the source of airflow comprises the air from the exit.
A transducer operative to generate an output acoustic wave, comprising:
- a driver;
- an armature element coupled to the driver, the armature undergoing motion in response to the input signal being input to the driver;
- and
- a plurality of airfoil-shaped elements coupled to the armature element and operative to move in response to the motion of the armature element,
- wherein the plurality of airfoil-shaped elements are coupled to the armature element in a manner so as to generate a longitudinal sound wave as the armature element undergoes motion, and
- wherein leading edges of the plurality of airfoil-shaped elements are positioned in opposing relation to each other and trailing edges of the plurality of airfoil-shaped elements are positioned in facing relation to each other.
Dependencies are inferred from the claim text.