| 摘要 |
PURPOSE:A magnetic fluid, prepared by dispersing fine particles of a magnetic material in a silicon oil, having a small variation in viscosity coefficient by the temperature change, and particularly effective for a magnetic driving system of a speaker. CONSTITUTION:A magnetic fluid prepared by making fine magnetic particles, e.g. iron, nickel or cobalt, surface-active, and dispersing the particles in a base oil, e.g. a silicone oil. The magnetic fluid is inserted in an opposite gap between a voice coil 2 and a pole piece 3 and an opposite gap between the voice coil 2 and a yoke plate 5 in applying the magnetic fluid to the vibrating system of a speaker. |
