| 摘要 |
<P>PROBLEM TO BE SOLVED: To achieve vibration of a vibration system at a sufficient stroke while reducing a size without increasing the number of components or cost. <P>SOLUTION: The magnetic suspension type loudspeaker includes: a voice coil 340 formed around a bobbin supported by the inner peripheral part of a diaphragm; and a yoke 230 supported by a frame 400, separately arranged on the outer diameter side of the voice coil, forming a magnetic circuit between the voice coil and itself, and having a hollow tubular part. The loudspeaker is structured such that magnetic suspension members 500 are arranged in a space part formed between the diaphragm 310 and the frame, each magnetic suspension member includes a diaphragm-side permanent magnet 520 fixed to the diaphragm, and a frame-side permanent magnet 540 fixed to the frame and spaced apart from and arranged opposite to the diaphragm-side permanent magnet, and the diaphragm-side permanent magnet and the frame-side permanent magnet are magnetized at the same pole such that the respective facing surfaces repel each other. <P>COPYRIGHT: (C)2010,JPO&INPIT |
