Nano membrane, method of manufacturing nano membrane, and apparatus for speaker and microphone using nano membrane

Patent metadata

Field	Value
Publication number	US-11140487-B2
Application number	US-201816190857-A
Country	US
Kind code	B2
Filing date	Nov 14, 2018
Priority date	Oct 11, 2017
Publication date	Oct 5, 2021
Grant date	Oct 5, 2021

Abstract

Disclosed herein is a nano membrane. The nano membrane includes an insulating layer having a thickness corresponding to a diameter of each of metal nanowires and configured to contain the metal nanowires therein, and the metal nanowires arranged to cross and having portions of side surfaces which protrude from one surface of the insulating layer.

First claim

What is claimed is:

1. A speaker device using a nano membrane, comprising:
a nano membrane including metal nanowires comprising:
an insulating layer having a predetermined thickness based on a diameter of each of metal nanowires and configured to contain the metal nanowires therein; and
the metal nanowires arranged to cross and having portions of side surfaces which protrude from one surface of the insulating layer,
wherein the predetermined thickness of the insulating layer is determined based on a height of a portion, at which the metal nanowires intersect, such that the metal nanowires are included inside the insulating layer; and

a voltage portion configured to apply an alternating current (AC) voltage to the nano membrane, to generate heat by resistance generated in the metal nanowires,
wherein an amplitude of the AC voltage and a heating time are controlled according to a temperature T s of the heat to be generated, based on an equation below:

T
s

=

U
2

⁢

t
/
R

-

Q
d

C
m

+

T
i

,

where T i represents an initial temperature of the nano membrane, U represents the amplitude of the AC voltage, t represents the heating time, R represents resistance of the metal nanowires, Q d represents dissipation heat, C represents a heat capacity ratio of the metal nanowires, and m represents a mass of the metal nanowires.

2. The nano membrane of claim 1 , wherein the metal nanowires are arranged such that the metal nanowires, of which a length direction is arranged in a second direction perpendicular to a first direction, are superimposed on the metal nanowires of which a length direction is arranged in the first direction.

3. The nano membrane of claim 1 , wherein the metal nanowires are connected in a network structure.

4. The speaker device of claim 1 , wherein the voltage portion changes a frequency of the AC voltage every predetermined period and applies the AC voltage of the changed frequency to the nano membrane.

5. The speaker device of claim 1 , further comprising a frequency measuring portion configured to measure a frequency of an input sound signal per time interval,
wherein the voltage portion changes a frequency of the AC voltage to correspond to the measured frequency and applies the AC voltage of the changed frequency to the nano membrane.

6. The nano membrane of claim 1 , the insulating layer comprises a deposited parylene-C.

Assignees

• Ulsan Nat Inst Science & Tech Unist

Inventors

• Ko Hyunhyub
• Kang Saewon
• Cho Seungse

Classifications

• C23C26/00

  Coating not provided for in groups C23C2/00 - C23C24/00 · CPC title

• C08J7/02

  with solvents, e.g. swelling agents · CPC title

• B29C66/03

  After-treatments in the joint area (B29C66/3262 takes precedence) · CPC title

• H04R19/00 Primary

  Electrostatic transducers · CPC title

• H04R2201/003

  Mems transducers or their use · CPC title