Translator Disclaimer
27 September 2016 High precision optomechanical assembly using threads as mechanical reference
Author Affiliations +
A convenient method to assemble optomechanical components is to use threaded interface. For example, lenses are often secured inside barrels using threaded rings. In other cases, multiple optical sub-assemblies such as lens barrels can be threaded to each other. Threads have the advantage to provide a simple assembly method, to be easy to manufacture, and to offer a compact mechanical design. On the other hand, threads are not considered to provide accurate centering between parts because of the assembly clearance between the inner and outer threads. For that reason, threads are often used in conjunction with precision cylindrical surfaces to limit the radial clearance between the parts to be centered. Therefore, tight manufacturing tolerances are needed on these pilot diameters, which affect the cost of the optical assembly. This paper presents a new optomechanical approach that uses threads as mechanical reference. This innovative method relies on geometric principles to auto-center parts to each other with a very low centering error that is usually less than 5 μm. The method allows to auto-center an optical group in a main barrel, to perform an axial adjustment of an optical group inside a main barrel, and to perform stacking of multiple barrels. In conjunction with the lens auto-centering method that also used threads as a mechanical reference, this novel solution opens new possibilities to realize a variety of different high precision optomechanical assemblies at lower cost.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Frédéric Lamontagne, Nichola Desnoyers, Guy Bergeron, and Mario Cantin "High precision optomechanical assembly using threads as mechanical reference", Proc. SPIE 9951, Optical System Alignment, Tolerancing, and Verification X, 995107 (27 September 2016);


Strategies for active alignment of lenses
Proceedings of SPIE (October 11 2015)
Disruptive advancement in precision lens mounting
Proceedings of SPIE (September 03 2015)
Design for alignment
Proceedings of SPIE (August 30 2019)
Precision lens assembly with alignment turning system
Proceedings of SPIE (October 16 2017)
Techniques For Characterizing Optical System Fabrication
Proceedings of SPIE (August 13 1984)
A six sigma review of miniature optics alignment
Proceedings of SPIE (August 21 2009)

Back to Top