| 摘要 |
Disclosed herein is a linear actuator for controlling the movement of a payload along a linear trajectory. Such actuator is particularly useful, for example, in controlling the radial position of a write/read head in an optical or magnetic recorder/player. The actuator comprises a simple elongated ferromagnetic member, preferably having a substantially triangular cross-section. Such member is surrounded by a coil to which a payload-bearing carriage is rigidly connected. Bearing devices are provided for slidably mounting the carriage for movement on and along the ferromagnetic member. A plurality of magnets serve to establish a magnetic field through which the coil, upon applicaiton of a current, is advanced along the ferromagnetic member. The ferromagnetic member serves the dual function of conducting magnetic flux and guiding the payload along the linear trajectory.
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