| 摘要 |
PROBLEM TO BE SOLVED: To provide a dynamic speaker unit easy in wiring to a voice coil and capable of obtaining satisfactory frequency characteristics wide in reproduction frequency band. SOLUTION: A 2nd diaphragm 12 is provided to outer circumference of a cone diaphragm 1 that is driven through connection to a voice coil 4. The diaphragm 12 is formed conical made of an electrically insulated material and a large diameter part 12a is in contact with an outer circumferential face of the cone diaphragm 1 and a small diameter part 12b is parted from the cone diaphragm 1 and connects to the outre circumference of the voice coil 4. Thus, the strength of the cone diaphragm 1 is increased to increase a maximum input, and distortion at a low frequency of the cone diaphragm 1, split vibration at a high frequency and resonance can be suppressed, the reproduction frequency band is extended and satisfactory frequency characteristics can be obtained. Furthermore, a lead wire 13 connects to the diaphragm 12 and power is supplied to the voice coil 4 through the lead wire 13.
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