| 摘要 |
PURPOSE:To increase the oscillation area of a woofer without reducing a magnetic flux density by making the outside diameter of the other face side smaller than that of a center pole contacting face side with respect to an annular magnet of a tweeter of a coaxial composite speaker. CONSTITUTION:A center pole 1 is provided on a magnetic circuit 4 for woofer through a holding base 5 for the tweeter. An annular magnet 13 for the tweeter is provided on this center pole 1, and a plate 3, a frame 8 for the tweeter, a diaphragm 6 for the tweeter, and an edge 7 are provided. This annular magnet 13 for the tweeter is provided with a step part on the outside circumferential part, and the outside diameter of the side contacting with the center pole is made larger than that of the other side. Thus, the frame 8 for the tweeter is made small-sized without reducing the tweeter-side magnetic flux density, and as the result, the inside diameter of a diphragm 12 for the woofer is made small, and the oscillation area is increased to raise the acoustic pressure. |
