Parametric transducer with graphene conductive surface

摘要

An ultrasonic audio speaker includes an emitter and a driver. The emitter can include a first layer having a conductive surface; a second layer having a conductive surface; and an insulating layer disposed between the first and second conductive surfaces, wherein the first and second layers are disposed in touching relation to the insulating layer. The driver circuit can include two inputs configured to be coupled to receive an audio modulated ultrasonic signal from an amplifier and two outputs, wherein a first output is coupled to the conductive surface of the first layer and the second output is coupled to the conductive surface of the second layer. Either one or both of the conductive surfaces of the first and second layers may be graphene.

主权项

1. An ultrasonic audio speaker, comprising:
an emitter, the emitter comprising:
a first layer having a conductive surface;a second layer having a conductive surface;an insulating layer disposed between the first and second conductive surfaces, wherein the first and second layers are disposed in touching relation to the insulating layer; a driver circuit having two inputs configured to be coupled to receive an audio modulated ultrasonic carrier signal from an amplifier and two outputs, wherein a first output is coupled to the conductive surface of the first layer and the second output is coupled to the conductive surface of the second layer, and wherein at least one of the conductive surface of the first layer and the conductive surface of the second layer are graphene; and a bias voltage source configured to apply a bias voltage across the emitter.