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Proceedings Paper

Disruptive advancement in precision lens mounting
Author(s): Frédéric Lamontagne; Nichola Desnoyers; Michel Doucet; Patrice Côté; Jonny Gauvin; Geneviève Anctil
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Paper Abstract

Threaded rings are used to fix lenses in a large portion of opto-mechanical assemblies. This is the case for the low cost drop-in approach in which the lenses are dropped into cavities cut into a barrel and clamped with threaded rings. The walls of a cavity are generally used to constrain the lateral and axial position of the lens within the cavity. In general, the drop-in approach is low cost but imposes fundamental limitations especially on the optical performances. On the other hand, active alignment methods provide a high level of centering accuracy but increase the cost of the optical assembly.

This paper first presents a review of the most common lens mounting techniques used to secure and center lenses in optical systems. Advantages and disadvantages of each mounting technique are discussed in terms of precision and cost. Then, the different contributors which affect the centering of a lens when using the drop-in approach, such as the threaded ring, friction, and manufacturing errors, are detailed. Finally, a patent pending lens mounting technique developed at INO that alleviates the drawbacks of the drop-in and the active alignment approaches is introduced. This innovative auto-centering method requires a very low assembly time, does not need tight manufacturing tolerances and offers a very high level of centering accuracy, usually less than 5 μm. Centering test results performed on real optical assemblies are also presented.

Paper Details

Date Published: 3 September 2015
PDF: 13 pages
Proc. SPIE 9582, Optical System Alignment, Tolerancing, and Verification IX, 95820D (3 September 2015); doi: 10.1117/12.2196441
Show Author Affiliations
Frédéric Lamontagne, INO (Canada)
Nichola Desnoyers, INO (Canada)
Michel Doucet, INO (Canada)
Patrice Côté, INO (Canada)
Jonny Gauvin, INO (Canada)
Geneviève Anctil, INO (Canada)


Published in SPIE Proceedings Vol. 9582:
Optical System Alignment, Tolerancing, and Verification IX
José Sasián; Richard N. Youngworth, Editor(s)

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