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Double-purpose thin film equipment for sound transmission and extension and manufacturing method thereof

A production method and film technology, which are applied to electret electrostatic transducers and other directions, can solve the problems of large volume, complicated structure of microphones and loudspeakers, and the need for improvement of silicon microphones.

Active Publication Date: 2014-04-02
SHENZHEN HORN AUDIO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The structure of traditional microphones and loudspeakers is relatively complex, including multiple parts, and the volume is relatively large. The parts need to be precisely processed, and the process requirements are very strict.
However, the cost performance of the newly developed silicon microphone needs to be improved, and the packaging process and quality problems need to be improved urgently.

Method used

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  • Double-purpose thin film equipment for sound transmission and extension and manufacturing method thereof
  • Double-purpose thin film equipment for sound transmission and extension and manufacturing method thereof
  • Double-purpose thin film equipment for sound transmission and extension and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Such as figure 1 with figure 2 As shown, the sound transmission and speaker dual-purpose film device 100 of this embodiment includes: a piezoelectric electret film 110 and a circuit board assembly 120.

[0030] The piezoelectric electret film 110 includes a porous polymer film 112, electrodes 114 symmetrically arranged on both sides of the porous polymer film 112, and a film connection terminal 116 electrically connected to the electrode 114.

[0031] The porous polymer film 112 of the present embodiment is in the shape of a square, with foam or honeycomb structure pores on it. The upper and lower surfaces of the holes are respectively deposited with positive and negative charges. The pores of the porous polymer film 112 in this embodiment are disc-shaped or lens-shaped. The holes are closed in the longitudinal direction (the thickness direction of the porous polymer film 112). Disc-shaped or lenticular holes are easier to be compressed than traditional circular or nearly...

Embodiment 2

[0073] Such as image 3 , Figure 4 As shown, the sound transmission and speaker dual-purpose film device 200 of this embodiment includes a piezoelectric electret film 210 and a circuit board assembly 220. The difference from Embodiment 1 is that the piezoelectric electret film 210 of this embodiment is provided with a plurality of electrodes 214 on the porous polymer film 212 to form an electrode array. Each pair of corresponding electrodes on both sides of the porous polymer film 212 constitutes a piezoelectric unit. Correspondingly, each piezoelectric unit is provided with a film connection terminal 216.

[0074] The circuit board assembly 220 of this embodiment is fixed in the blank area of ​​the piezoelectric electret film 210, and is provided with a first connection terminal 222 electrically connected to the film connection terminal 216 and a second connection terminal for connecting with an external circuit 224. The second connection terminal 224 is provided with a wire...

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Abstract

The invention relates to double-purpose thin film equipment for sound transmission and extension, comprising a piezoelectric electret thin film and a circuit board assembly; the piezoelectric electret thin film includes a porous polymer thin film, electrodes symmetrically installed at the two sides of the porous polymer thin film, and a thin film connection end electrically connected with the electrodes; positive and negative charges are respectively deposited on the upper and lower surfaces of a hole on the porous polymer thin film; and a first connection end electrically connected with the thin film connection end and a second connection end connected with an external circuit are installed on the circuit board assembly. The positive and negative charges are deposited on the upper and lower surfaces of the hole on the porous polymer thin film so as to form an electric dipole; under the influence of the pressure of sound wave, the thickness of the hole on the piezoelectric film changes, such that the size of the electric dipole in the hole changes, and compensation charges in the electrodes also change; therefore, the voltage between the electrodes changes, namely acoustoelectric conversion is realized by using a piezoelectric effect; and vice versa, the thickness of the piezoelectric film vibrates according to a reciprocal piezoelectric effect, the sound wave is generated, and the electroacoustic conversion is realized.

Description

【Technical Field】 [0001] The invention relates to the field of microphone speakers, in particular to a dual-purpose film device for sound transmission and loudspeaker and a manufacturing method thereof. 【Background technique】 [0002] Current microphones mainly include traditional electret condenser microphones (ECM) and silicon microphones (also called microelectromechanical systems (MEMS) microphones) developed in recent years. The electret condenser microphone is composed of an electret film coated with a metal layer on one side and a metal electrode (back electrode) with several small holes. The electret face is opposite to the back electrode with a very small air gap in the middle, which forms a capacitor. Since the electret has a polarized charge, there is a potential difference between the two poles of the capacitor. When sound waves act on the electret film, the vibration of the diaphragm produces displacement and changes the capacitance of the capacitor, so that the ou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R19/01
Inventor 方鹏朱彪
Owner SHENZHEN HORN AUDIO