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Multi-layer electret with ultra-high charge stability and mfg. method thereof

An electret, stability technology, applied in the field of multi-layer electret and its manufacturing, can solve the problem of being easily affected by moisture or the surrounding environment

Inactive Publication Date: 2003-07-02
BSE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the above-mentioned materials have a problem that although they resist heat, they are easily affected by moisture or the surrounding environment

Method used

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  • Multi-layer electret with ultra-high charge stability and mfg. method thereof
  • Multi-layer electret with ultra-high charge stability and mfg. method thereof
  • Multi-layer electret with ultra-high charge stability and mfg. method thereof

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Embodiment Construction

[0017] Now, the present invention will be described with reference to the preferred embodiments of the accompanying drawings.

[0018] refer to figure 2 , the polymer electret with ultra-high charging stability according to the present invention is manufactured in such a way that a 12.5 μm-25 μm thick FEP film 12 is bonded on a metal sheet 11 and has a high crystallinity of 30 μm- A 100 μm thick polytetrafluoroethylene (hereinafter referred to as PTFE) film 20 is laminated on the FEP film 12 . Thus, a multilayer electret is constructed.

[0019] Electrets made of FEP film and PTFE film can be processed by SMT because of their high crystallinity. PTFE membranes are formed by a process generally different from the manufacturing method of FEP membranes.

[0020] FEP film is difficult to form with high crystallinity because it is formed by melt extrusion. Even if it has high crystallinity, one grain thereof becomes large so that fine grains cannot be formed on the entire film...

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Abstract

A multi-layer electret that can endure a high temperature so as to be processed by surface mount technology (SMT) and has ultra-high charge stability and a method of manufacturing thereof are provided. The multi-layer electret is constructed in such a manner that an FET film of 12.5 mum~25 mum in thickness melting-adheres to a surface of a metal plate, and a PTFE film of 30 mum~100 mum in thickness melting-adheres to the surface of the FEP film. A method of manufacturing the multi-layer electret having ultra-high charge stability comprises a first step of laminating an FEP film on a metal plate; a second step of heating the metal plate on which the FEP film was laminated at a high temperature and applying high pressure thereto, whereby the FEP film and the metal plate melting-adhere to each other; a third step of laminating a PTFE film on the FEP film attached to the metal plate; a fourth step of heating the laminated structure and applying high pressure thereto, whereby the PTFE film melting-adheres to the FEP film; a fifth step of cooling the resulting structure, to accomplish an electret; and a sixth step of charging the cooled electret with charges.

Description

technical field [0001] The present invention relates to an electret used in a condenser loudspeaker and a manufacturing method thereof, and more particularly, to a multilayer electret capable of resisting high temperatures so that the surface can be used Mounting technology (SMT) processing, and has ultra-high charging stability. Background technique [0002] In general, loudspeakers are divided based on the method of converting mechanical vibrations into electrical signals: carbon loudspeakers using the resistive properties of carbon crystal grains, crystal loudspeakers using the piezoelectric effect of potassium sodium tartrate tetrahydrate, vibrating in a magnetic field A moving coil loudspeaker with a vibrating membrane of a coil to generate an induced current, a velocity microphone that uses the phenomenon that a metal sheet placed in a magnetic field receives a sound wave and vibrates to generate an induced current, and a velocity microphone t...

Claims

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Application Information

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IPC IPC(8): B32B15/082B29C65/46B29K27/18B29K105/22B32B15/08B32B27/06B32B37/02H01G7/02H04R19/01H04R19/04H04R31/00
CPCH01G7/02H04R19/016B29C66/71B32B2311/00Y10T428/3154B32B27/06B32B2327/18B32B2309/02H01G7/023B32B15/08B32B2309/12Y10T29/49226B32B2327/12B32B37/02H04R31/00H04R19/04
Inventor 赵琴行李源泽
Owner BSE CO LTD
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