Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1995-10-11
1998-05-12
Shafer, Ricky D.
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359214, 359225, 359872, 359877, 248486, G02B 2608, G02B 7182
Patent
active
057514607
ABSTRACT:
An articulated optical system has a pair of actuators (42, 44) each of which pivot a head mirror (34) about respective parallel axes (E.sub.1, E.sub.2) 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 (E.sub.1) 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 (d.sub.b) 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 (E.sub.2) of the fine actuator (44); therefore, jitter and vibration are substantially eliminated.
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Harrell John P.
Wheeler Bryce A.
Alkov Leonard A.
Hughes Aircraft Company
Lenzen, Jr. Glenn H.
Schubert William C.
Shafer Ricky D.
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