PURPOSE: To decrease the peak at high frequencies and to realize an averaged sound pressure by inserting an adhesive substance on the midway of a torque delivering member delivering a torque exerted to a voice coil to a diaphragm.
CONSTITUTION: A circular flat diaphragm 1 is supported by an edge member 6 and an end having a large diameter of a drive cone 5 made of a frustum of cone is bonded to the diaphragm 1 by an adhesives. An end having a small diameter of the drive cone 5 is bonded to the coil bobbin 3 via an adhesives 7. A voice coil 4 is wound on the coil bobbin 3 and supported by a damper 8. As the adhesives 7, an acrylic or silicone resin group adhesives with excellent heat resistance and time aging resistance is used. Since the adhesives is inserted to the midway of a path from the voice coil 4 to the diaphragm 1, a large sound pressure peak due to the resonance of the diaphragm is suppressed and the averaged sound pressure characteristic is realized.
SATOU KAZUHIDE
SATOU KATSUMASA
SAEKI SHIYUUJI
ISHIKAWA SEIICHI
INOUE HIDEAKI
| JPS5517600U | 1980-02-04 |