Graphene composite acoustic diaphragm
First Claim
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1. An audio device comprising:
- a support structure;
an acoustic element disposed within a recess of the support structure; and
a diaphragm coupled to the support structure, the diaphragm comprising;
a center portion comprising a base material;
a flexible portion comprising the base material and surrounding the center portion and configured to flex in response to a movement of the center portion with respect to the support structure; and
a graphene flake material molded into the base material, wherein a concentration of the graphene flake material is higher within the center portion than within the flexible portion such that an elastic modulus of the center portion is greater than an elastic modulus of the flexible portion.
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Abstract
The disclosure relates to an audio device that includes a diaphragm having a graphene material, such as a graphene flake, that is incorporated into a base material. The audio device may form part of a speaker device, a microphone device, or a headphone device. The concentration of the graphene and/or a size of the graphene flakes may be varied throughout the diaphragm to define a stiff center portion and a flexible portion that surrounds the center portion.
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Citations
19 Claims
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1. An audio device comprising:
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a support structure; an acoustic element disposed within a recess of the support structure; and a diaphragm coupled to the support structure, the diaphragm comprising; a center portion comprising a base material; a flexible portion comprising the base material and surrounding the center portion and configured to flex in response to a movement of the center portion with respect to the support structure; and a graphene flake material molded into the base material, wherein a concentration of the graphene flake material is higher within the center portion than within the flexible portion such that an elastic modulus of the center portion is greater than an elastic modulus of the flexible portion. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A portable electronic device comprising:
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a housing defining an opening; a display positioned in the opening of the housing; an audio device comprising; a support structure; a diaphragm flexibly connected to the support structure and configured to transmit or receive sound waves, wherein the diaphragm includes graphene molded into a base material, and wherein a concentration of the graphene is higher within a center portion of the diaphragm than within a flexible portion of the diaphragm such that an elastic modulus of the center portion is greater than an elastic modulus of the flexible portion. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method for manufacturing a diaphragm for an audio device, the method comprising:
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forming a support structure; positioning an acoustic element within a recess of the support structure; forming a diaphragm and coupling it to the support structure, wherein the diaphragm is formed by; preparing a base material; forming a flexible portion that surrounds a center portion, wherein the flexible portion and the center portion are both formed from the base material; molding graphene flakes within the base material, wherein a concentration of the graphene flakes is higher within the center portion than within the flexible portion such that an elastic modulus of the center portion is greater than an elastic modulus of the flexible portion. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification