WELDING TYPE CONDENSER MICROPHONE AND METHOD OF MAKING THE SAME

摘要

The present invention relates to a welding type condenser microphone (ECM) which is manufactured by attaching a printed circuit board (PCB) to a case and, more specifically, to a welding type condenser microphone (ECM) with improved signal contact characteristics using conductive epoxy and to a manufacturing method thereof. The manufacturing method of the present invention comprises the following steps of: assembling a metal case sub assembly by compressing and mounting a first base, to which a back electrode plate (BE) is compressed, in a case after stacking a vibration plate and a spacer in the case; assembling a PCB sub assembly by SMT-installing circuit elements and a second base in a PCB substrate; coating the second base, which is installed in the PCB sub assembly, with conductive epoxy; arranging a case sub assembly in the PCB sub assembly of a PCB disc by reversing the case sub assembly; welding the case sub assembly and the PCB sub assembly in the arranged state; sealing a boundary surface between the case and the PCB with sealing epoxy; and hardening the conductive epoxy and the sealing epoxy by heat. The present invention is able to: stably weld a solid base and a PCB by solder in an SMT process; solve a contact problem by the height tolerance of each component by spreading conductive epoxy on the solid base which is a component which delivers an electrical signal; resolve the instability of an electrical signal connection by an external impact; and secure reliability by the contact stabilization of an electrical signal transmission between a back electrode plate (BE) and the PCB.