Capacitor microphone
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 13, 2004
Grant Date -
May 2, 2002
app pub date -
Oct 29, 2001
filing date -
Oct 30, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A capacitor microphone includes a case having an end wall defining an opening for a sound hole, a capacitor portion comprising a diaphragm, a back plate and a spacer, the diaphragm opposing to the back plate via the spacer, the capacitor portion being accommodated in the case in such an manner as the diaphragm is placed on the side of the end wall, and a substrate accommodated in the case farther from the end wall than the capacitor portion, the substrate having an impedance conversion element mounted on a surface thereof facing the capacitor portion. A communicating opening is provided around the back plate in a position opposing to the impedance conversion element for communicating spaces on the front and back sides of the back plate. The communicating opening has a larger area than that of the top of the impedance conversion element to allow the spaces on both sides of the back plate to communicate with each other. It is possible to ensure that the impedance element and the back plate do not interfere with each other.
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Cited Art Landscape
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