| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a speaker unit capable of easily grasping conditions of a voice coil, a multi-speaker device, and a method for inspecting the voice coil of the speaker unit. <P>SOLUTION: A circuit, connects in series with an LC serial resonance circuit resonating if a signal of a specific frequency in an ultrasonic band is input, and a first emission means for emitting light with a first emission color. The circuit in series is connected in parallel to the voice coil of the speaker unit. Further, a second coil is provided at a second side of the voice coil. A closed circuit comprises a second emission means for emitting light with a second emission color, and the second coil. An emission means package comprises the first emission means and the second emission means, in which a third emission color is generated when the first/second emission means simultaneously emit light. <P>COPYRIGHT: (C)2007,JPO&INPIT |
