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Proceedings Paper

Further considerations of axial preload variations with temperature and the resultant effects on contact stresses in simple lens mountings
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Paper Abstract

Prior publications have postulated a direct relationship between a change in temperature and the corresponding change in axial preload of the form ▵P = K3▵T for a lens or series of lenses compressed with a force PA between a cell shoulder and a retaining ring or flange at assembly. Equations previously derived for K3 considered only the effects of bulk compression of the lens and stretching of the cell wall. Several other factors that help determine K3 have recently been identified. Four of these potentially significant factors (localized deformations of the glass and metal surfaces within the elastic interface, deflections of the retainer and of the shoulder, and radial dimension changes of the lens and cell) are considered here. It is shown that neglecting these factors can lead to significant overestimation of the magnitude of K3 for a given design and result in overestimation of temperature change effects on contact stress. An example of a selected lens mounting design cascading all of these mechanical effects illustrates the significance of this new theory. Reasonable correlation achieved between classical equations and FEA analysis for key aspects of the analysis lends credence to the theory. The advantage of providing controlled axial compliance in the mechanical design also is illustrated.

Paper Details

Date Published: 30 August 2005
PDF: 15 pages
Proc. SPIE 5877, Optomechanics 2005, 587705 (30 August 2005); doi: 10.1117/12.619143
Show Author Affiliations
P. R. Yoder Jr., Optical Engineering Consultant (United States)
A. E. Hatheway, Alson E. Hatheway, Inc. (United States)

Published in SPIE Proceedings Vol. 5877:
Optomechanics 2005
Alson E. Hatheway, Editor(s)

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