VOLUME REDUCTION FILLING MEMBER FOR MICROPHONE AND UNIDIRECTIONAL CONDENSER MICROPHONE INCORPORATING THE SAME

摘要

A microphone includes a volume reduction filling member therein. The volume reduction filling member includes an elastic body having an insertion hole for inserting an electrode extraction member which extracts a generated current to a back end side by contacting a front end side thereof to a fixed electrode of a microphone unit, and reducing a volume inside a unit case. The elastic body is divided into a tip-side main body portion and a base-end-side flexible flange portion through a circular groove around the insertion hole from an outer peripheral face side of a base end portion thereof. When an outer peripheral edge portion of the base-end-side flexible flange portion receives an equal pressure toward a tip direction so as to bend, the elastic body concentrates a stress into a front portion side of the insertion hole through the tip-side main body portion.

主权项

1. A volume reduction filling member for a microphone, comprising:
an elastic body adapted to be disposed in a unit case of a condenser microphone unit and including an insertion hole extending in a center axis direction thereof, for inserting and disposing an electrode extraction member which extracts a generated current to a back end side, the elastic body reducing a volume inside the unit case together with the electrode extraction member, the elastic body comprising: a tip-side main body portion, a base-end-side flexible flange portion, and a circular groove dividing the elastic body into the tip-side main body portion and the base-end-side flexible flange portion, the circular groove having an equal width and depth around the insertion hole and extending orthogonal to a length direction of the insertion hole from an outer peripheral face near a base end portion thereof so that when an outer peripheral edge portion of the base-end-side flexible flange portion receives an equal pressure toward a tip direction and bends, a stress is concentrated into a front portion of the tip-side main body portion around the insertion hole.