| 摘要 |
PURPOSE:To obtain large torque with a small-sized constitution by providing a couple of coils in a gap between a yoke and a magnet so that it swivels freely, and coupling those coils with an arm frame. CONSTITUTION:A frame 2 is rectangular and at its lower end, a fixed plate 3 is provided as a fixed side. In the inside cavity part 2a of the frame 2, a semicircular magnet 4, a couple of yokes 5a and 5b, and a couple of fan-shaped vertical driving coils 6a and 6b are arranged. The lower part of the magnet 4 is fixed to the fixed plate 3 and divided into, for example, an upper and a lower halfs; while one surface 4a is magnetized with the upper half to the S pole and the lower half to the N pole, the other surface 4b is also magnetized with the upper half to the N pole and the lower half to the S pole. Then, a couple of yokes 5a and 5b are provided at proper intervals from both the surfaces 4a and 4b of the magnet 4. The magnet 4 is fixed vertically to the fixed plate 3 forming the fixed side and its fixation position is nearly in the center of the cavity part of the frame 2 while the magnet is in parallel to the side walls 2b and 2c of the frame 2. |
