Sound generation device

A sound-generating device and reinforcing layer technology, applied in the direction of sensors, electrical components, etc., can solve problems such as low elastic modulus, lower listening effect, inconsistent vibration, etc., and achieve excellent high-frequency performance

Active Publication Date: 2019-04-23
GOERTEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The elastic modulus of these two materials is low, which makes the reinforcement layer prone to deformation at high frequencies
The vibration of each part of the reinforcement layer is inconsistent, which will cause noise in the speaker unit, which greatly reduces the listening effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] In this example, the performance of carbon fibers 20 of different diameters of the same material was tested. The carbon fiber 20 is polyacrylonitrile-based carbon fiber or pitch-based carbon fiber. See Table 1 for details.

[0081] Filament diameter / μm

Carbon fiber 20 diameter / μm

Tensile strength / GPa

Elastic modulus / GPa

6

3.1

5.89

286

7

3.6

5.45

281

8

5.0

4.46

274

11

7.0

3.79

259

13

8.5

3.46

251

[0082] Table 1 - the relationship between the diameter of the precursor, the diameter of carbon fiber 20 and the mechanical properties of carbon fiber 20

[0083] It can be seen from Table 1 that as the diameter of the carbon fiber 20 decreases, the tensile strength and elastic modulus of the carbon fiber 20 gradually increase. When the diameter of the carbon fiber 20 is less than 7.0 μm, the tensile strength and elastic modulus of the carbon fiber 20 are relatively large, re...

Embodiment 2

[0085] In this example, the diameters and mechanical properties of carbon fibers 20 of different grades and diameters are compared. See Table 2 for details.

[0086] Grade

diameter

tensile strength

Elastic Modulus

T-300

7.0

3.53

230

T-800H

5.2

5.59

294

T-1000

5.3

7.06

294

LM-400

6.4

4.51

294

LM-500

5.0

5.10

300

LM-600

5.0

5.79

285

MR50P

5.0

5.49

294

MR60P

5.0

6.17

294

MRE60P

5.0

6.17

323

[0087] Table 2 - Main mechanical properties of different grades of carbon fiber 20

[0088] It can be seen from Table 2 that the diameters of the above-mentioned various carbon fibers 20 are all within 7.0 μm, and all have high tensile strength and elastic modulus, which significantly improves the stiffness of the reinforcing layer 15 .

Embodiment 3

[0090] The acoustic performance of the sound generating device of the embodiment of the present invention is compared with that of the existing sound generating device. Wherein, the power of the two sound generating devices is the same. The reinforcing layer 15 of the sound generating device according to the embodiment of the present invention has a structure of unidirectional carbon fiber prepreg layer + PMI foam core layer + unidirectional carbon fiber prepreg layer. A unidirectional layer of carbon fiber prepreg sets a layer of carbon fiber. The carbon fibers have a diameter of 4-5 μm and are arranged in the same direction; the material of the reinforcing layer 15 of the existing sound generating device is aluminum foil+adhesive film+PMI foam core layer+adhesive film+aluminum foil. The size of the two reinforcing layers 15 is the same, the length of the sound generating device is 18mm, and the width is 13mm. The reinforcing layer 15 has a length of 14 mm and a width of 9 ...

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Abstract

The invention discloses a sound generation device. The sound generation device comprises a magnetic circuit system configured to be used for forming a magnetic field; and a vibration system, wherein the vibration system comprises a voice coil, a vibration diaphragm and a reinforcing layer; one end of the voice coil is connected with a center part of the vibration diaphragm, and the other end is located in the magnetic field; the reinforcing layer is arranged at the center part, the reinforcing layer comprises a carbon fiber prepreg layer, and an oriented angle of the graphite microcrystal of the carbon fiber in the carbon fiber prepreg layer is less than or equal to 30 DEGC, and the oriented angle is the included angle of the graphite microcrystal and a fiber axis.

Description

technical field [0001] The present invention relates to the technical field of electroacoustic conversion, and more specifically, to a sound generating device. Background technique [0002] The speaker unit emits sound through a vibration system. The vibration system includes diaphragm, voice coil and reinforcement layer. The reinforcing layer is usually made of plastic or metal. The elastic modulus of these two materials is low, which makes the reinforcement layer prone to deformation at high frequencies. The vibration of each part of the reinforcement layer is inconsistent, which will cause noise in the speaker unit, which greatly reduces the listening effect. [0003] Therefore, a new technical solution needs to be provided to solve the above technical problems. Contents of the invention [0004] An object of the present invention is to provide a new technical solution for a sound generating device. [0005] According to a first aspect of the present invention, a s...

Claims

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Application Information

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IPC IPC(8): H04R9/06H04R9/02
CPCH04R9/025H04R9/06
Inventor 李美玲凌风光郑泽东张成飞李春
Owner GOERTEK INC
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