| 摘要 |
PURPOSE:To bond a flat diaphragm plate to a coil, to avoid split oscillation of the diaphragm plate and to playback the original signal over a broad band, by locating a plurality of magnetic circuit units with a magnetic gap in matrix and inserting a voice coil to the gap of each magnetic circuit respectively. CONSTITUTION:A plurality of magnetic circuit units 20 with a magnetic gap 25 are arranged in matrix by arranging the gap 25 toward column direction. One voice coil 26 is assigned to the unit 20 and the coil of opposite sides of a pair of the coil 26 is inserted to the gap 25. The coils are connected in series or parallel with leads 29, the coil 26 is bonded at lower side of a square flat diaphragm plate 30, and the diaphragm plate 30 is supported to a frame 32 at the cir cumference with a damper 31. The interval of the coils 26 toward x is divided into arbitrarily, allowing to enable piston movement over a broad band, and the original signal is playbacked with fidelity over a broad band from low to high frequencies. |
