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A kind of fiber acoustic transducer and its preparation method and application

An acoustic transducer and fiber technology, applied in the field of acoustics, can solve problems such as inability to integrate, and achieve the effects of high output power, high sound quality, and good stability

Active Publication Date: 2022-03-18
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The microphone and speaker currently on the market are two independent devices, which cannot be integrated

Method used

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  • A kind of fiber acoustic transducer and its preparation method and application
  • A kind of fiber acoustic transducer and its preparation method and application
  • A kind of fiber acoustic transducer and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Preparation of the fiber acoustic transducer: select an aluminum strip with a length of 30 cm, a width of 1 mm, and a thickness of 10 μm. Choose a flexible NdFeB magnetic fiber with a length of 20 cm and a cross section of a square with a side length of 1 mm. Fix the aluminum strip on the flexible NdFeB magnetic fiber by fixing a point every 25 mm. Leave 5cm lead electrodes on each side. The obtained acoustic transducer can emit 40-60 dB of sound in the range of audible sound (20-20,000 Hz) at a distance of 1 cm when used as a loudspeaker. When used as a microphone, it can clearly record the waveform of the sound wave;

[0028] (2) Realize directional sound by fiber speaker: bend the fiber speaker with a length of 140 cm into a circular arc with a radius of 64 cm. A sine wave alternating current with a current of 1A and a frequency of 1000 Hz is applied to both ends. Use Umik-1, miniDSP microphone to measure the sound pressure level at the center of the circle a...

Embodiment 2

[0032] (1) Preparation of the fiber acoustic transducer: select an aluminum strip with a length of 30 cm, a width of 1 mm, and a thickness of 15 μm. Choose a flexible NdFeB magnetic fiber with a length of 20 cm and a cross section of a square with a side length of 1 mm. Fix the aluminum strip on the flexible NdFeB magnetic fiber by fixing a point every 11 mm. Leave 5cm lead electrodes on each side. The resulting acoustic transducer can emit 40-60 dB of sound in the audible sound range (20-20,000 Hz) at a distance of 1 cm when used as a loudspeaker. When used as a microphone, it can clearly record the waveform of the sound wave;

[0033](2) Realize directional sound by fiber speaker: bend the fiber speaker with a length of 140 cm into a circular arc with a radius of 64 cm. A sine wave alternating current with a current of 1A and a frequency of 1000 Hz is applied to both ends. Use Umik-1, miniDSP microphone to measure the sound pressure level at the center of the circle and ...

Embodiment 3

[0037] (1) Preparation of the fiber acoustic transducer: select an aluminum strip with a length of 30 cm, a width of 1 mm, and a thickness of 20 μm. Choose a flexible NdFeB magnetic fiber with a length of 20 cm and a cross section of a square with a side length of 1 mm. Fix the aluminum strip on the flexible NdFeB magnetic fiber by fixing a point every 50mm. Leave 5cm lead electrodes on each side. The obtained acoustic transducer can emit 40-55 dB of sound in the audible sound (20-20,000 Hz) range at a distance of 1 cm when used as a loudspeaker. When used as a microphone, it can clearly record the waveform of the sound wave;

[0038] (2) Realize directional sound by fiber speaker: bend the fiber speaker with a length of 140 cm into a circular arc with a radius of 64 cm. A sine wave alternating current with a current of 1A and a frequency of 1000 Hz is applied to both ends. Use Umik-1, miniDSP microphone to measure the sound pressure level at the center of the circle and i...

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Abstract

The invention belongs to the technical field of acoustics, in particular to a fiber acoustic transducer and its preparation method and application. The fiber acoustic transducer of the present invention is composed of a metal strip and a flexible magnetic fiber; the metal strip is used to generate vibration, and the flexible magnetic fiber provides a magnetic field; when working as a loudspeaker, the strip-shaped metal can produce a larger volume and has the advantages of Good stability; the speaker with one-dimensional structure has good directivity, high sound quality and large output power; the fiber speaker has a flexible structure, and the focus point of the sound field can be changed by changing the shape of the fiber speaker. When working as a microphone, it is woven into the fabric and allows the user to localize sound sources. The fiber acoustic transducer of the invention has application prospects in the fields of blind guidance, emergency rescue and disaster relief, and the like. In addition, weaving fiber acoustic transducers into fabrics has higher practical application value.

Description

technical field [0001] The invention belongs to the technical field of acoustics, and in particular relates to a fiber acoustic transducer and its preparation method and application. Background technique [0002] Sound is an important way for people to transmit information. With the vigorous development of flexible electronic devices, there is an increasing demand for flexible acoustic transducers to replace traditional bulky acoustic devices in the wearable field. [1] Compared with film-like acoustic transducers, the advantage that fiber acoustic transducers can be further prepared by weaving acoustic fabrics makes them have great application prospects in wearable electronic devices. [0003] In recent years, a series of progress has been made in the research of flexible acoustic devices, such as carbon nanotube speakers [1] , graphene speaker [2] , electret acoustic transducer [3] , liquid metal acoustic transducer [4] and silver nanowire acoustic transducers [5] . ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R31/00
CPCH04R31/00H04R2231/00
Inventor 彭慧胜邹君逸
Owner FUDAN UNIV
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