About OGA JURO
About MIX音研
About OGA JURO
About 日本音響学会誌
About microphone
About MEMS
About technical history
About technology development
About electret
About カーボンマイクロホン
About capacitor microphone
About シリコンマイクロホン
About ダイナミックマイクロホン
About Audio equipment
About マイクロホン
About 開発
About 動向
About 用途