Patent ID: 6757399
Filing Date: 2004-06-29
Classification: H04R

Abstract:
A noise canceling pickup with an electret, comprising a cylinder body having a front cover and a rear cover, said front cover is provided with sound passing holes, said cylinder body is provided with an oscillating membrane of the electret, a back electrode sheet and a back electrode base,characterized in that said cylinder body is composed of a front cylinder body and a rear cylinder body, said oscillating membrane is provided into said front cylinder body, a membrane tightening ring is provided to abut against the oscillating membrane so as to adjust the position of the oscillating membrane, a damping membrane is provided within said front cylinder body to abut against the front cover thereof, said damping membrane is fixed by a damping membrane pressing sheet, said rear cover of said cylinder body is provided with at least one sound passing hole, and said rear cylinder body is provided with electric elements therein, wherein said front cylinder body is provided with a partition washer which is in engagement with the damping membrane pressing sheet, a side-front washer which is in engagement with the membrane tightening ring, and a partition which is convex in the central portion thereof and is provided between said partition washer and side side-front washer, said central portion of the partition is arranged to convex to the oscillating membrane and to be projected into the membrane tightening ring, so as to form a chamber together with the oscillating membrane, and the outer surface of said convex portion is arranged to abut against the inner surface of said side-front washer and the inner surface of said membrane tightening ring.