Acoustic diaphragm including graphene and acoustic device employing the same

• US 10,681,464 B2
• Filed: 10/29/2018
• Issued: 06/09/2020
• Est. Priority Date: 07/03/2018
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Sangwon, Shin, Hyeonjin, Seol, Minsu, Lee, Dongwook
• Primary Examiner(s): Chin, Vivian C
• Assistant Examiner(s): Fahnert, Friedrich
• Application Number:
  US16/173,516
• Publication Number:
  US 20200015016A1
• Time in Patent Office: 589 Days
• Field of Search: 381 87, 381111, 381164, 381335, 381337, 381426
• CPC Class Codes: H04R 15/00 Magnetostrictive transducers magnetostrictive elements in general H10N30/00
• CPC Class Codes: H04R 17/00 Piezoelectric transducers; Electrostrictive transducers piezoelectric or electrostrictive elements in general H10N30/00; details of piezoelectric or electrostrictive motors, generators or positioners H10N30/00
• CPC Class Codes: H04R 19/00 Electrostatic transducers
• CPC Class Codes: H04R 2307/021 Diaphragms comprising cellulose-like materials, e.g. wood, paper, linen
• CPC Class Codes: H04R 2307/023 Diaphragms comprising ceramic-like materials, e.g. pure ceramic, glass, boride, nitride, carbide, mica and carbon materials
• CPC Class Codes: H04R 2307/025 Diaphragms comprising polymeric materials
• CPC Class Codes: H04R 2307/027 Diaphragms comprising metallic materials
• CPC Class Codes: H04R 7/02 characterised by the construction
• CPC Class Codes: H04R 7/04 Plane diaphragms
• CPC Class Codes: H04R 7/06 comprising a plurality of sections or layers
• CPC Class Codes: H04R 7/10 comprising superposed layers in contact
• CPC Class Codes: H04R 7/12 Non-planar diaphragms or cones
• CPC Class Codes: H04R 7/122 comprising a plurality of sections or layers
• CPC Class Codes: H04R 7/125 comprising a plurality of superposed layers in contact
• CPC Class Codes: H04R 7/127 dome-shaped

Abstract

Provided are an acoustic diaphragm and an acoustic device including the same. The acoustic diaphragm may include graphene nanoparticles, and an average particle size of the graphene nanoparticles may be about 10 nm or less. The graphene nanoparticles substantially may have a particle size of about 1 nm to about 10 nm. The graphene nanoparticles may include at least one functional group selected from a hydroxyl group, a carboxyl group, a carbonyl group, an epoxy group, an amine group, and an amide group.

Claims

1. An acoustic diaphragm for an acoustic device, the acoustic diaphragm comprising:

a graphene-containing layer including graphene nanoparticles, wherein

the graphene nanoparticles have an average particle size of 10 nm or less,

the graphene-containing layer includes at least one different material other than graphene, and

the at least one different material includes at least one selected from a polymer, a single molecule, a metal, and a metal complex.

2. The acoustic diaphragm of claim 1, wherein

the graphene nanoparticles substantially have a particle size in the range of about 1 nm to about 10 nm.

3. The acoustic diaphragm of claim 1, wherein

the graphene nanoparticles include at least one functional group selected from a hydroxyl group, a carboxyl group, a carbonyl group, an epoxy group, an amine group, and an amide group.

4. The acoustic diaphragm of claim 1, wherein

the graphene nanoparticles have a carbon content in a range of about 50 at % to about 95 at %.

5. The acoustic diaphragm of claim 1, wherein

an amount of the graphene nanoparticles in the graphene-containing layer is in a range of about 1 wt % to about 99 wt %.

6. The acoustic diaphragm of claim 5, wherein

the amount of the graphene nanoparticles in the graphene-containing layer is in a range of about 30 wt % to about 90 wt %.

7. The acoustic diaphragm of claim 1, wherein

the acoustic diaphragm further includes an auxiliary layer, wherein

the graphene-containing layer is arranged on one surface or two opposite surfaces of the auxiliary layer.

8. The acoustic diaphragm of claim 7, wherein

the auxiliary layer includes at least one selected from cellulose, a polymer-based material, a metal-based material, and a carbon-based material.

9. The acoustic diaphragm of claim 7, wherein

the auxiliary layer includes at least one selected from paper, polyester, aluminum (Al), titanium (Ti), beryllium (Be), carbon fiber, and CVD synthetic diamond.

10. The acoustic diaphragm of claim 1, wherein

the acoustic diaphragm further includes a first auxiliary layer and a second auxiliary layer, and

the graphene-containing layer is arranged between the first auxiliary layer and the second auxiliary layer.

11. The acoustic diaphragm of claim 1, wherein

the acoustic diaphragm has a cone shape, a flat plate shape, or a dome shape.

12. An acoustic device comprising:

an acoustic diaphragm including a graphene-containing layer including graphene nanoparticles, wherein the graphene nanoparticles substantially have a particle size in a range of about 1 nm to about 10 nm, and the graphene nanoparticles have a carbon content in a range of about 50 at % to about 95 at %,

the graphene-containing layer includes at least one different material other than graphene, and

the at least one different material includes at least one selected from a polymer, a single molecule, a metal, and a metal complex;

a support configured to support the acoustic diaphragm; and

an electro-acoustic transducer connected to the acoustic diaphragm.

13. The acoustic diaphragm of claim 12, wherein

the graphene-containing layer further includes at least one different material other than graphene, and

the at least one different material includes one selected from an organic material, an inorganic material, and an organic-inorganic composite material.

14. The acoustic device of claim 12, wherein

the electro-acoustic transducer is configured to convert an electrical signal into an acoustic signal.

15. The acoustic device of claim 12, wherein

the electro-acoustic transducer is configured to convert an acoustic signal into an electrical signal.

16. The acoustic device of claim 12, wherein

the acoustic device is an electromagnetic-type device, an electrostatic-type device, or a piezoelectric-type device.

17. The acoustic device of claim 12, wherein

the acoustic device is any one of a speaker, an earphone, a headphone, and a microphone.

18. An electronic apparatus comprising:

the acoustic device according to claim 12.

19. An acoustic device comprising:

an acoustic diaphragm including a graphene-containing layer including graphene quantum dots (GQDs), wherein

the graphene-containing layer includes at least one different material other than graphene, and

the at least one different material includes at least one selected from a polymer, a single molecule, a metal, and a metal complex;

a support configured to support the acoustic diaphragm; and

an electro-acoustic transducer connected to the acoustic diaphragm.