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1 January 1987 A Positioning Device Of Half Micron Linear Resolution For A Cassegrain Secondary
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Abstract
Minimizing obscuration in Cassegrain optical systems places limits on the secondary mirror diameter and width of the supporting spider vanes. Accompanying those limits is the requirement that the focus, tilt, and decentration drives fit within the obscuration limits. This paper presents a design solution to the problem of minimizing obscuration while providing adjustment capability for focus, tilt, and decentration using stepper motors with integral harmonic drives coupled to eccentrics and flexures to ultimately achieve resolutions of half-micron in focus, 5 micron translation and 70 microradians in the tilt mode. The resulting design eliminates friction, hysteresis and injurious thermal effects by means of flexural connecting members of super invar.
© (1987) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ralph H. Zacharias "A Positioning Device Of Half Micron Linear Resolution For A Cassegrain Secondary", Proc. SPIE 0817, Optomechanical Systems Engineering, (1 January 1987); doi: 10.1117/12.967408; https://doi.org/10.1117/12.967408
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