Advanced illumination quality improvement of micro lens array diffuser by randomizing shape error

Toshiki Hamatani; Yukinobu Nishio; Tomohito Kuwagaito; Seiichiro Kitagawa

doi:10.1117/12.3001192

13 March 2024 Advanced illumination quality improvement of micro lens array diffuser by randomizing shape error

Toshiki Hamatani, Yukinobu Nishio, Tomohito Kuwagaito, Seiichiro Kitagawa

Proceedings Volume 12898, Advanced Fabrication Technologies for Micro/Nano Optics and Photonics XVII; 1289803 (2024) https://doi.org/10.1117/12.3001192
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

Micro lens array (MLA) is an optical element used in various purposes. For MLA industrial lighting device, such as uniform illumination diffuser or super wide-angle diffuser, it is required to achieve high quality illumination control. When we process MLA mold by ordinary diamond milling, error factors including tool wear, cause the same distribution of shape errors in each micro lens. The MLA lighting device produced using this mold will have an illuminance irregularity on the light distribution corresponding to the shape error distribution. In this study, we have investigated a processing method to vary the distribution of the shape error of each micro lens comprising the MLA for improve illumination quality. This method can be applied to various MLA design, for example, MLA consisting of aspheric micro lens with a maximum tangent angle of more than 60° or non-rotationally symmetric micro lens such as polynomial freeform surface.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Toshiki Hamatani, Yukinobu Nishio, Tomohito Kuwagaito, and Seiichiro Kitagawa "Advanced illumination quality improvement of micro lens array diffuser by randomizing shape error", Proc. SPIE 12898, Advanced Fabrication Technologies for Micro/Nano Optics and Photonics XVII, 1289803 (13 March 2024); https://doi.org/10.1117/12.3001192

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available