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Proceedings Paper

A Positioning Device Of Half Micron Linear Resolution For A Cassegrain Secondary
Author(s): Ralph H. Zacharias
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Paper 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.

Paper Details

Date Published: 1 January 1987
PDF: 4 pages
Proc. SPIE 0817, Optomechanical Systems Engineering, (1 January 1987); doi: 10.1117/12.967408
Show Author Affiliations
Ralph H. Zacharias, Contraves Goerz Corporation (United States)

Published in SPIE Proceedings Vol. 0817:
Optomechanical Systems Engineering
Daniel Vukobratovich, Editor(s)

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