ELECTRO-ACOUSTIC MAGNETIC REED TYPE TRANSDUCER HAVING BOX-SHAPED POLE PIECE

摘要

An electro-acoustic transducer with an open ended box-shaped inner housing which supports one leg of a U-shaped armature within a main frame. The other leg of the U-shaped armature extends through the open end of the box shaped housing and is free to vibrate in an air gap formed between two permanent magnets which are fixedly mounted on opposite inner wall portions of the box-shaped inner housing. The vibratable leg of the U-shaped armature is surrounded by a coil and is connected by a drive pin to a diaphragm. The box-shaped inner housing forms the closing portion of d.c. and a.c. flux paths.