Diaphragm, sound generation device, and method for manufacturing sound generation device
Embodiments relate to a diaphragm having high rigidity and high internal loss. The diaphragm may comprise: a matrix-shaped structure including a plurality of through-holes; and a graphene layer disposed in at least a part of the plurality of through-holes and coupled to the structure.
1 . A diaphragm comprising:
a structure including a first material formed in a matrix shape including a plurality of through holes; and
a graphene layer combined with the structure to be located in at least one of the plurality of through holes to fill the at least a portion of the through holes.
2 . The diaphragm of claim 1 , further comprising:
a binder including a second material for promoting combining the structure and the graphene layer together.
3 . The diaphragm of claim 2 , wherein the first material is identical to the second material.
4 . The diaphragm of claim 2 , wherein the binder is 5 to 20 percent by weight of the diaphragm.
5 . The diaphragm of claim 1 , further comprising:
a coating layer formed on at least one surface of the structure and configured to protect the diaphragm.
6 . The diaphragm of claim 1 , wherein the graphene layer includes a plurality of graphene layers which are stacked.
7 . The diaphragm of claim 1 , wherein:
the diaphragm includes a dome portion disposed at a central portion of the diaphragm and an edge portion forming an edge of the dome portion; and
the dome portion and the edge portion include the structure and the graphene layer.
8 . The diaphragm of claim 1 , wherein the first material is at least one of graphene, cellulose, nacre, bone, dention, polyacryl acid (PAA), polycyclic aromatic hydrocarbon (PAH), glutaraldehyde (GA), borate, polyvinyl alcohol (PVA), or PCDO.
9 . The diaphragm of claim 2 , wherein the second material is at least one of cellulose, nacre, bone, dention, PAA, PAH, GA, borate, PVA, or PCDO.
10 . The diaphragm of claim 5 , wherein the coating layer is at least one polymer compound including cellulose or PVA.
11 . A sound generating device comprising:
a vibrating portion; and
a driver configured to support the vibrating portion and cause the vibrating portion to vibrate,
wherein the vibrating portion comprises:
a structure formed in a matrix shape including a plurality of through holes, and
a graphene layer combined with the structure to be located in at least one of the plurality of through holes to fill the at least a portion of the through holes.
12 . A method of manufacturing a sound generating device, the method comprising:
forming a structure having a structure formed in a matrix shape including a plurality of through holes and comprised of a first material in a first solution including graphene particles;
forming a graphene film by combining the graphene particles with the structure to be located in at least one of the plurality of through holes to fill the at least a portion of the through holes; and
compressing the graphene film to form a shape using a mold.
13 . The method of claim 12 , wherein the first solution further includes a binder including a second material for promoting combining the graphene particles and the structure.
14 . The method of claim 12 , wherein the mold is coated with the first solution.
15 . The method of claim 13 , wherein the binder is 5 to 20 percent by weight of the graphene film.