Electrostatic graphene speaker
AssigneeThe Regents of the University of California
InventorsQin Zhou, Alexander Zettl
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Abstract
This disclosure provides systems, methods, and apparatus associated with an electrostatically driven graphene speaker. In one aspect, a device includes a graphene membrane, a first frame on a first side of the graphene membrane, and a second frame on a second side of the graphene membrane. The first frame and the second frame both include substantially circular open regions that define a substantially circular portion of the graphene membrane. A first electrode is proximate the first side of the circular portion of the graphene membrane. A second electrode proximate the second side of the circular portion of the graphene membrane.
Claims29
A device comprising:
- a graphene membrane having a diameter of about 5 millimeters to 9 millimeters;
- a first electrode proximate a first side of the graphene membrane, the first electrode being electrically conductive and having a first oxide layer disposed thereon;
- and
- a second electrode proximate a second side of the graphene membrane, the second electrode being electrically conductive and having a second oxide layer disposed thereon, the graphene membrane being suspended between the first electrode and the second electrode,
- wherein the device is a loudspeaker.
The device of clam 1, further comprising:
- a first frame disposed on the first side of the graphene membrane;
- and
- a second frame disposed on the second side of the graphene membrane, the first frame and the second frame both including substantially circular open regions that define a substantially circular portion of the graphene membrane.
A method comprising:
- (a) providing a device including;
- a graphene membrane;
- a first electrode proximate a first side of the graphene membrane, the first electrode being electrically conductive and having a first oxide layer disposed thereon;
- and
- a second electrode proximate a second side of the graphene membrane, the second electrode being electrically conductive and having a second oxide layer disposed thereon, the graphene membrane being suspended between the first electrode and the second electrode;
- (b) biasing the graphene membrane with a direct current voltage;
- and
- (c) biasing the first electrode and the second electrode with an input signal, causing the graphene membrane to move and generate an audible sound;
- wherein the device is configured to generate a broad hand response at least from 20 Hz to 20 kHz in step (c).
An electrostatic audio loudspeaker comprising:
- a graphene membrane;
- a first electrode proximate a first side of the graphene membrane, the first electrode being electrically conductive and haying a first oxide layer disposed thereon;
- and
- a second electrode proximate a second side of the graphene membrane, the second electrode being electrically conductive and having a second oxide layer disposed thereon, the graphene membrane being suspended between the first electrode and the second electrode,
- wherein the electrostatic audio loudspeaker is configured to generate a relative sound pressure level of at least 40 dB at least from 20 Hz to 20 kHz.
Dependencies are inferred from the claim text.