8 March 2014 Automated assembly of camera modules using active alignment with up to six degrees of freedom
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Proceedings Volume 8992, Photonic Instrumentation Engineering; 89920F (2014) https://doi.org/10.1117/12.2041754
Event: SPIE OPTO, 2014, San Francisco, California, United States
Abstract
With the upcoming Ultra High Definition (UHD) cameras, the accurate alignment of optical systems with respect to the UHD image sensor becomes increasingly important. Even with a perfect objective lens, the image quality will deteriorate when it is poorly aligned to the sensor. For evaluating the imaging quality the Modulation Transfer Function (MTF) is used as the most accepted test. In the first part it is described how the alignment errors that lead to a low imaging quality can be measured. Collimators with crosshair at defined field positions or a test chart are used as object generators for infinite-finite or respectively finite-finite conjugation. The process how to align the image sensor accurately to the optical system will be described. The focus position, shift, tilt and rotation of the image sensor are automatically corrected to obtain an optimized MTF for all field positions including the center. The software algorithm to grab images, calculate the MTF and adjust the image sensor in six degrees of freedom within less than 30 seconds per UHD camera module is described. The resulting accuracy of the image sensor rotation is better than 2 arcmin and the accuracy position alignment in x,y,z is better 2 μm. Finally, the process of gluing and UV-curing is described and how it is managed in the integrated process.
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K. Bräuniger, D. Stickler, D. Winters, C. Volmer, M. Jahn, S. Krey, "Automated assembly of camera modules using active alignment with up to six degrees of freedom", Proc. SPIE 8992, Photonic Instrumentation Engineering, 89920F (8 March 2014); doi: 10.1117/12.2041754; https://doi.org/10.1117/12.2041754
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