Patent ID: 9516427
Filing Date: 2016-12-06
CPC Classification: H04R

Claim Text:
1. An electrode extraction terminal to be housed inside a unit case for a unidirectional condenser microphone unit, comprising: a conductive electrode rod including a projection portion at a tip side; and a conductive pedestal portion integrally formed with the projection portion, and having a flat surface, a peripheral wall surrounding the flat surface and having a sitting height same as that of the projection portion, and at least one sound hole provided in the flat surface to penetrate the conductive pedestal portion, the flat surface being arranged orthogonal to an axis direction of the conductive electrode rod and adapted to face a fixed electrode under a shape and a size showing a cardioid in directivity, wherein the conductive pedestal portion includes a minute concave-convex surface provided in at least a peripheral surface area of the at least one sound hole to reduce an acoustic resistance value so as to show a hyper cardioid in directivity.