Patent ID: 9749752
Date: 2017-08-29
CPC Classifications: H04R

Claim:
1. A method of manufacturing a microphone, comprising: preparing a first substrate having first and second opposing surfaces and then forming a vibrating membrane having an oxide film and a plurality of slots onto the first opposing surface of the first substrate; forming a sacrificial layer and fixed membrane, each having first and second opposing surfaces, over the vibrating membrane and then forming a plurality of air intake holes through the fixed membrane; depositing a first pad to be connected with the fixed membrane, a second pad to be connected with the vibrating membrane, and a bonding pad for bonding a phase delay unit; forming a first penetration hole by etching the second opposing surface of the first substrate and forming an air layer between the fixed membrane and the vibrating membrane by partially etching the oxide film and the sacrificial layer; and bonding the phase delay unit on the bonding pad, wherein the phase delay unit is formed by: preparing a second substrate having first and second opposing surfaces and then forming a groove by etching the second opposing surface of the second substrate; forming a plurality of second penetration holes through the groove and the first opposing surface of the second substrate; depositing a catalyst to the first opposing surface of the second substrate and the second penetration holes; and synthesizing CNT (carbon nanotubes) using the catalyst.