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Capacitor microphone and its making process

A capacitive microphone, electronic technology, applied in electrostatic transducer microphones, electrostatic sensors, electrostatic transducer speakers, etc., can solve problems such as microphone performance damage

Inactive Publication Date: 2006-07-05
PANASONIC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, when a non-insulator such as a human body comes into contact with the forming surface of the electret, or when it is exposed to excessive humidity during storage as a part, the injected charges are easily discharged, and there are problems as follows, That is, damage to performance as a microphone after assembly

Method used

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  • Capacitor microphone and its making process
  • Capacitor microphone and its making process
  • Capacitor microphone and its making process

Examples

Experimental program
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Effect test

no. 1 example

[0036] figure 1 An enlarged view showing a main part of electro-acoustic conversion in the basic mechanism of the electret condenser microphone according to the first embodiment of the present invention. This electret condenser microphone includes a vibrating diaphragm ring 2, a conductive vibrating film 3 with a ground electrode (hereinafter referred to as the outer electrode layer 31), a gasket 4, and a conductor fixed electrode (hereinafter referred to as the inner electrode layer 31) in the housing 1. ) 5, and an insulating ring 6, and an output terminal 7 for outputting a voltage (potential difference) between the fixed electrode 5 and the case 1 is drawn out from the case 1.

[0037] The casing 1 is shaped as a hollow cylinder, and its entire bottom end surface is opened, and a large hole portion 1A is formed, and a circular hole 1C having a diameter of not less than 1.0 mm is provided at the front edge surface (outer surface) 1B constituting the cover. . Furthermore,...

no. 2 example

[0049] image 3 An enlarged view showing an electro-acoustic conversion main part of an electret condenser microphone according to a second embodiment of the present invention. In this regard, in this embodiment, the same reference numerals denote the same parts as those of the first embodiment, and repeated descriptions are omitted. In the electret condenser microphone of this embodiment, the electret is formed in the inorganic or organic dielectric layer 51 provided in the conductor fixed electrode (hereinafter, referred to as the inner electrode) 52 instead of in the dielectric layer of the conductive vibrating film 3. Electrical layer 34 (composed of organic compounds) side.

[0050] In the dielectric layer 34, compared with the first embodiment, the thickness is reduced by an amount so as not to exceed 4 μm, wherein no electret is formed, or in order to allow radiation particles to easily penetrate the conductive vibrating membrane 3, for example, in this embodiment In ...

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Abstract

A condenser microphone has a conductive diaphragm 3 having an earth electrode layer 31 formed of a conductive light metal; a conductor fixed electrode 5 arranged opposite to the conductive diaphragm 3 through an air layer; an organic dielectric layer 32 formed of the organic compound provided on the boundary surface 32C side between the air layer and the conductive diaphragm 3; and a permanent electric charge layer 32A composed of ions or electrons formed in the inner portion side receding from the air layer 8 side, from a middle position in the thickness direction of the organic dielectric layer 32 in the inside of the organic dielectric layer 32.

Description

technical field [0001] The present invention relates to a condenser microphone which can be operated without an external power feed, in which charges are injected (polarized) from the outside into an electret, and to a method of manufacturing the microphone. Background technique [0002] As is well known, a condenser microphone is constructed in such a manner that it has a conductive vibrating membrane and a conductive fixed electrode (hereinafter referred to as a conductor fixed electrode), which is arranged opposite to the conductive vibrating membrane through an air layer parallel to the conductive vibrating membrane. , and the change in capacitance between the conductive diaphragm and the conductor fixed electrode due to the vibration of the diaphragm is detected as the sound pressure on the diaphragm. In this case, in order to output the detection result as an electrical signal, a DC voltage is applied in advance between the two conductors (conductiv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R19/02H04R31/00H04R19/01H04R19/04
CPCH04R19/016
Inventor 安野功修利光平大
Owner PANASONIC CORP
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