Reflective grayscale pattern by superposed layers of microcylindrical lenses

Chunhao Fang; Xiaolu Miao; Su Shen

doi:10.1117/12.3010778

1 November 2023 Reflective grayscale pattern by superposed layers of microcylindrical lenses

Chunhao Fang, Xiaolu Miao, Su Shen

Proceedings Volume 12917, International Conference on Precision Instruments and Optical Engineering (PIOE 2023); 1291712 (2023) https://doi.org/10.1117/12.3010778
Event: 3rd International Conference on Precision Instruments and Optical Engineering (PIOE 2023), 2023, Shanghai, China

Abstract

Thanks to their striking visual appeal, grayscale moiré pattern have a high potential for document, security, art, and decoration. In recent years, researchers have paid extensive attention to using microlens arrays instead of micrographic arrays as the base layer to achieve novel moiré effects in moiré magnifiers. In order to reduce the thickness of the grayscale imaging device and increase the dots per inch (DPI) of the grayscale image, we proposed a reflective grayscale moiré imaging device. By using a curved microcylindrical lens array (CMCLA) with a metal reflector layer deposited on the surface as the base layer, the reflective device achieves a similar grayscale effect as the transmissive device with a smaller offset in the base layer, thereby increasing the fill factor of CMCLA. Applications of such devices can be found in the protection of valuable items against forgery.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Chunhao Fang, Xiaolu Miao, and Su Shen "Reflective grayscale pattern by superposed layers of microcylindrical lenses ", Proc. SPIE 12917, International Conference on Precision Instruments and Optical Engineering (PIOE 2023), 1291712 (1 November 2023); https://doi.org/10.1117/12.3010778

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KEYWORDS

Imaging devices

Reflection

Lens arrays

Microlens array

Ultraviolet radiation

Photoresist materials

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