Inventor
OYABA TAKASHI
5 patents
Patents
5 patentsUS3982143ASep 21, 1976
Piezoelectric diaphragm electro-acoustic transducer
PIONEER ELECTRONIC CORP37 citations91
US5117463AMay 26, 1992
Speaker system having directivity
PIONEER ELECTRONIC CORP26 citations88
US4991687AFeb 12, 1991
Speaker system having directivity
PIONEER ELECTRONIC CORP44 citations88
US4461932AJul 24, 1984
Ribbon type speaker and method of assembling magnetic circuit thereof
PIONEER ELECTRONIC CORP17 citations71
US3976897AAug 24, 1976
Piezoelectric electro-acoustic diaphragm transducer with composite resilient backing
PIONEER ELECTRONIC CORP6 citations61