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Electret capacitor microphone

A condenser microphone and electret technology, applied in electret electrostatic transducers, microphones, electrostatic transducer microphones, etc., can solve problems such as the inability to achieve high sensitivity of electret condenser microphones and the large amount of parasitic capacity generated.

Inactive Publication Date: 2009-05-06
HOSIDEN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] Therefore, in the existing electret condenser microphone, the generation of parasitic capacity is large, and the high sensitivity of the electret condenser microphone may not be realized

Method used

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Experimental program
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Effect test

no. 1 Embodiment approach

[0057] First, the electret condenser microphone of the first embodiment will be described.

[0058] Such as figure 1 and figure 2 As shown, the electret condenser microphone is composed of the following components: a capacitor part 3, equipped with a vibrating plate 1 as a vibrating membrane electrode and a back plate 2 as a fixed electrode; a housing part 7, which accommodates the capacitor part 3; a substrate 5, Equipped with a conversion circuit 4 that converts the change in the electrostatic capacity of the capacitor part 3 generated by the vibration of the vibration plate 1 into an electrical signal and outputs it; and a conduction part 6 that is arranged inside the case part 7 and The capacitor part 3 and the substrate 5 are electrically connected.

[0059] The capacitor part 3 is formed into a circular shape in plan view by overlapping the disk-shaped vibration plate 1 , the ring-shaped spacer 8 and the disk-shaped back plate 2 . In addition, the capacitor part 3 i...

no. 2 Embodiment approach

[0077] Next, an electret condenser microphone according to a second embodiment will be described. This second embodiment is an embodiment different from the above-mentioned first embodiment, and the vertical positional relationship between the vibrating plate 1 and the back electrode plate 2 is different.

[0078] Such as Figure 6 and Figure 7 As shown, the first case part 13 , the back plate 2 , the spacer 8 , the vibration plate 1 and the second case part 14 are sequentially stacked and assembled on the substrate 5 equipped with the conversion circuit 4 . This forms a cuboid-shaped electret condenser microphone.

[0079] Compared with the above-mentioned first embodiment, the positional relationship in the vertical direction of the diaphragm 1 and the back plate 2 is upside down to form an electret condenser microphone with a reverse structure.

no. 3 Embodiment approach

[0081] Next, an electret condenser microphone according to a third embodiment will be described. This third embodiment is an embodiment different from the above-mentioned first embodiment, and the shape of the case part 7 in plan view is different.

[0082] Such as Figure 8 As shown, the shapes of the first case part 13 and the second case part 14 in plan view are square, and the shape of case part 7 in plan view is square. In addition, the first case part 13 , the vibrating plate 1 , the spacer 8 , the back electrode plate 2 , the mesh member 18 and the second case part 14 are sequentially stacked and assembled on the substrate 5 equipped with the conversion circuit 4 . This forms a cube-shaped electret condenser microphone.

[0083] The first case portion 13 includes four protruding portions 13b, and the conduction portion 6 is respectively arranged at the front ends of the four protruding portions 13b.

[0084] Such as Figure 9 As shown, the shape of the case part 7 w...

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Abstract

An electret capacitor microphone having a reduced parasitic capacitance and a higher sensitivity. The electret capacitor microphone comprises a capacitor section (3) having a fixed electrode (2) with an electret member (11) and a vibratory membrane electrode (1), a case section (7) containing the capacitor section (3), a base (5) having a converting circuit (4) for converting a variation of a static capacitance of the capacitor section (3) caused by the vibration of the vibratory membrane electrode (1) into an electric signal and outputting the electric signal, and an electric connection section (6) provided inside the case section (7) and adapted for electrically connecting the capacitor section (3) to the base (5). The distance between the outer side of the capacitor section (3) and the case section (7) varies in the circumferential direction of the capacitor section (3) when they are viewed from above. The shape of the case section (7) when viewed from above is different from that of the capacitor section (3) when viewed from above.

Description

technical field [0001] The present invention relates to an electret condenser microphone, which has: a condenser part provided with a vibrating membrane electrode and a fixed electrode equipped with an electret part; The change in the electrostatic capacity of the above-mentioned capacitor part generated by the vibration of the vibrating film electrode is converted into an electrical signal and output; the conduction part conducts the above-mentioned capacitor part and the above-mentioned substrate; and accommodates the above-mentioned capacitor part, the above-mentioned substrate and the above-mentioned conduction part the shell part. Background technique [0002] In the above-mentioned electret condenser microphone, the vibrating membrane electrode is vibrated by the input sound, the capacitance of the capacitance portion changes, and the conversion circuit outputs an electric signal corresponding to the change in the capacitance of the capacitance portion. Thus, the elec...

Claims

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Application Information

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IPC IPC(8): H04R19/04H04R19/01
CPCH04R19/016H04R2410/03H04R19/04
Inventor 井土俊朗中西贤介粟村龙二
Owner HOSIDEN CORP
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