| 摘要 |
An articulated optical system has a pair of actuators (42, 44) each of which pivots a head mirror (34) about respective parallel axes (E1, E2) to direct the line-of-sight of an optical beam through a window (36) of a vehicle (30) to an optical sensor (38). Of the actuators, a coarse actuator (42) pivots the mirror (34) through substantially the entire desired field of regard of the optical system, and a fine actuator (44) pivots the mirror (34) for fine adjustment, e.g., less than five degrees. The coarse actuator (42) is positioned so that the axis thereof (E1) is located as close as possible to an edge of the mirror (34), so that the radial distance therebetween is small; therefore, the size of the window (36) is minimized with respect to the diameter (db) of the optical beam. The fine actuator (44) is attached to approximately the geometric center of the mirror (34), so that the mirror (34) is statically balanced about the elevation axis (E2) of the fine actuator (44); therefore, jitter and vibration are substantially eliminated.
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