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Proceedings Paper

Tensile stresses in ring-mounted glass lenses
Author(s): Alson E. Hatheway
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Paper Abstract

Knowledgeable design of lens mounts using metal rings requires the ability to accurately predict the state of stress created in the surface of the glass lenses. Only this ability permits the engineer to be sure to keep the surface tensile stresses under an acceptable level. A review of the literature of optomechanics and structural mechanics fails to disclose a consistent procedure for calculating the stresses in the surface of the glass. The most popular method (Delgado and Hallinan) is a hybrid technique (employing both cylinders and spheres) that the author finds predicts surface tensile stresses that are unrealistically high. The author has gone back to the elastic theory, derived the differential equations for the ring-mounted-lens geometry and integrated them to calculate the state of stress in the glass surface under the influence of compressive loading from metal retaining rings. The results are presented as closed-form equations for the state of stress over the entire surface of the lens. The implications for the design of retaining ring mountings are discussed.

Paper Details

Date Published: 10 September 2009
PDF: 8 pages
Proc. SPIE 7424, Advances in Optomechanics, 742409 (10 September 2009); doi: 10.1117/12.828587
Show Author Affiliations
Alson E. Hatheway, Alson E. Hatheway, Inc. (United States)

Published in SPIE Proceedings Vol. 7424:
Advances in Optomechanics
Alson E. Hatheway, Editor(s)

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