Mr. Akihiko Sugino Profile

Akihiko Sugino

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Proceedings Article | 4 October 2022 Presentation + Paper

Evaluation of decenter evaluation method between free-form lens surfaces

Tomofumi Morishita, Koji Handa, Akihiko Sugino

Proceedings Volume 12219, 122190F (2022) https://doi.org/10.1117/12.2635321

KEYWORDS: Software development, Aspheric lenses, Neodymium, Freeform optics, Optical spheres, Optical components, Algorithm development, 3D metrology

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Latest advancements in XR devices or the application of autonomous driving technology, the number of complicated freeform optical design components are increasing. And the demand for accurate measurement and evaluation is invaluable. In addition to standard form evaluation, there is an increasing demand for surface to surface decenter evaluation for optical characteristics, I.E.: bi-aspherical surfaces. We believe a standardized evaluation solution is lacking in the market. We are proposing a method for axial center evaluation between lens surfaces by synthesizing coordinate system using three reference spheres.In this research, we have developed decenter and rotational misalignment evaluation method for freeform bi-aspheric optical components by the Ultrahigh Accurate 3-D Profilometer (UA3P) and by coordinate system synthesis method. Using a fixture that can evaluate both bi-aspheric surfaces, the rotational deviation was calculated between outline standard and the actual surfaces measurements from the UA3P. The result of regression line inter free-form rotational deviation against the mechanical rotational deviation has a slope of 0.9737 and a coefficient of determination of 0.9995.

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