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Electret polarizing method

A technology of electret and polarity, applied in the direction of electret, electret electrostatic transducer, sensor, etc., to achieve the effect of simple method and convenient operation

Inactive Publication Date: 2007-11-14
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is proposed for the defects and difficulties existing in the preparation of special material electret and micro-device structure electret in the existing corona polarization and thermal polarization methods. To provide an electret polarization method that is simple to operate, can form a stable electric field, and can realize industrial applications

Method used

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  • Electret polarizing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1 Referring to Fig. 1, the electret material of this embodiment adopts SiO 2 Film, polar polymer film using polyvinylidene fluoride.

[0031] ①. First vapor-deposit the metal electrode 4 on the back of the electret material 3;

[0032] ②. A layer of polar polymer film 2 is covered on the front of the electret material 3;

[0033] ③, raising the temperature to melt the polar polymer film 2;

[0034] ④. Attach another metal electrode 1 on the melted polar polymer film 2;

[0035] ⑤. Under the condition of keeping the polar polymer film 2 melted, a polarizing electric field is applied between the two electrodes for injection, and the voltage of the polarizing electric field is controlled so that the material does not undergo electrical breakdown;

[0036] ⑥. Cool down to room temperature and remove the electric field.

[0037] The electret obtained in this embodiment has a stable electric field.

Embodiment 2

[0038] Embodiment 2 Referring to Fig. 1, the electret material of this embodiment is SiO 2 / Si 3 N 4 Double-layer film, polar polymer film using polyvinylidene fluoride.

[0039] ①. First vapor-deposit the metal electrode 4 on the back of the electret material 3;

[0040] ②. A layer of polar polymer film 2 is covered on the front of the electret material 3;

[0041] ③, raising the temperature to melt the polar polymer film 2;

[0042] ④. Attach another metal electrode 1 on the melted polar polymer film 2;

[0043] ⑤. Under the condition of keeping the polar polymer film 2 melted, a polarizing electric field is applied between the two electrodes for injection, and the voltage of the polarizing electric field is controlled so that the material does not break down;

[0044] ⑥. Cool down to room temperature and remove the electric field.

[0045] The electret obtained in this embodiment also has a stable electric field.

Embodiment 3

[0046] Embodiment 3 Referring to FIG. 1 , the electret material in this embodiment is polytetrafluoroethylene film, and the polar polymer film is polyvinylidene fluoride.

[0047] ①. First vapor-deposit the metal electrode 4 on the back of the electret material 3;

[0048] ②. A layer of polar polymer film 2 is covered on the front of the electret material 3;

[0049] ③, raising the temperature to melt the polar polymer film 2;

[0050] ④. Attach another metal electrode 1 on the melted polar polymer film 2;

[0051] ⑤. Under the condition of keeping the polar polymer film 2 melted, a polarizing electric field is applied between the two electrodes for injection, and the voltage of the polarizing electric field is controlled so that the material does not break down;

[0052] ⑥. Cool down to room temperature and remove the electric field.

[0053] The electret obtained in this embodiment also has a stable electric field.

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Abstract

The invention relates to an electret polarizing method, comprising the steps of: (1) covering a layer of polar high molecular film on at least one surface of electret material, where the dielectric constant of the polar high molecular film is greater than that of the electret material; (2) raising temperature to melt the polar high molecular film and applying external electric field to the electret material for pole injection; (3) lowering temperature, and removing the electric field and obtaining the electret. And the invention uses the interface polarization between polar high molecular film and electret material, and injects carriers into traps of a certain height on the surface of the injected pole material so as to form stable electret; the method is simple and convenient to operate.

Description

(1) Technical field [0001] The invention relates to a polarization method for preparing special material electret and electret for micro-device structure. (2) Background technology [0002] Electret (Electret) is a class of functional dielectric materials containing oriented dipoles (frozen or ferroelectric) or quasi-permanent space charges (surface or in vivo), electrostatic, piezoelectric and pyroelectric effects are the basic physical effect. [0003] The British scientist Heaviside first proposed the concept of electret. He defined in 1892: when the external electric field is reduced to zero, the dielectric material (electret material) that can still maintain a certain residual electric moment in the body is an electret. In 1919, Eguchi developed the world's first artificial electret by using a blend of natural wax, resin and bezoar through the polarization method. In 1962, Sessler and West of Germany invented the first polymer film electret microphone in the Bell Labo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G7/02H04R19/01H04R31/00
Inventor 陈钢进肖慧明
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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