| 摘要 |
PURPOSE:To upgrade speaker efficiency by bonding a conically shaped or similarly shaped diaphragm having approximately equal size of inner diameter as that of a voice coil to the surface opposite to the voice coil bonded surface of a dome-shaped diaphragm. CONSTITUTION:A ring-shaped part 15 is attached to a top plate 13, the peripheral part of the dome-shaped diaphragm 14 is disposed on this ring-shaped part 15, and the second diaphragm 18 of conical shape is bonded to the surface opposite to the voice-coil-bonded surface of the dome-shaped diaphragm 14. As a result, the diameter of the diapharagm is made larger than that of a conventional speaker, and the efficiency can be upgraded in the operational frequency band of the dome-shaped speaker.
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