| 摘要 |
PROBLEM TO BE SOLVED: To provide a speaker used for various acoustic devices and information communication devices that can prevent a sound pressure level from being decreased with downsizing. SOLUTION: A speaker is provided with a sub cone 29 to cover the edge part 27a of a diaphragm 27 from the joint of a voice coil 28 to vibrate the sub cone 29 in the same phase as the diaphragm 27 with respect to the vertical vibration of the voice coil 28, thereby enhancing a sound pressure level due to an extended diaphragm area.
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