CAPACITOR MICROPHONE MANUFACTURING METHOD AND CAPACITOR MICROPHONE
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United States of America Patent
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N/A
Issued Date -
Jun 5, 2008
app pub date -
Nov 30, 2007
filing date -
Nov 30, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A capacitor microphone includes: a circuit substrate; a casing substrate fixed to an upper surface of the circuit substrate; a top cover substrate fixed to the upper surface; a capacitor part including a vibration film and a plate contained in the casing substrate; an impedance conversion element for converting variations in the electrostatic capacity of the capacitor part to electrical impedance; an electromagnetic shield portion electromagnetically shielding an inside of the casing substrate, the electromagnetic shield portion being formed in an outer surface of the casing substrate; a non-electromagnetic shield portion having no electromagnetic shield portion, the non-electromagnetic shield portion being formed in an outer surface of the casing substrate; and a through hole having a conductive property, the through hole being formed in the non-electromagnetic shield portion, wherein the inside of the casing substrate is shielded electromagnetically by the electromagnetic shield portion and the through hole.
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