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Design and Manufacture of 30-Degree Projection Lens for Augmented Reality Waveguide

A projection lens with a 30-degree field of view is developed for use in augmented reality (AR) glasses, including a waveguide combiner designed for a 0.35-inch LCoS panel. The entrance pupil diameter of the lens is 14 mm and the lens has an effective focal length of 16.443 mm; an F-number of 1.175....

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Published in:	Micromachines (Basel) 2024-09, Vol.15 (10), p.1198
Main Authors:	Sun, Wen-Shing, Hsu, Ying-Shun, Tien, Chuen-Lin, Lin, Wen-Kai, Su, Yi-Lun, Yu, Jun-Yi, Zhou, Shao-Kui, Liang, Yuan-Yan, Tsai, Wan-Pin, Sun, Chi, Lee, Tsung-Xian, Su, Wei-Chia, Lin, Shiuan-Huei, Sun, Ching-Cherng
Format:	Article
Language:	English
Subjects:	Angular resolution Augmented Reality Design Image quality LCoS pane Lens design Lenses Light magnifying glass Pixels projection lens Sensors waveguide Waveguides
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creator	Sun, Wen-Shing Hsu, Ying-Shun Tien, Chuen-Lin Lin, Wen-Kai Su, Yi-Lun Yu, Jun-Yi Zhou, Shao-Kui Liang, Yuan-Yan Tsai, Wan-Pin Sun, Chi Lee, Tsung-Xian Su, Wei-Chia Lin, Shiuan-Huei Sun, Ching-Cherng
description	A projection lens with a 30-degree field of view is developed for use in augmented reality (AR) glasses, including a waveguide combiner designed for a 0.35-inch LCoS panel. The entrance pupil diameter of the lens is 14 mm and the lens has an effective focal length of 16.443 mm; an F-number of 1.175. This paper has four key issues: optical projection lens design, lens manufacturing and assembly tolerance analysis, projection lens resolution testing, and AR glasses system resolution testing of panel images projected by the projection lens. After lens manufacture, the lens was tested, achieving a central field image quality of 57 cycles/mm, an angular resolution of 33 pixels per degree (PPD), a 0.7 field image quality of 40.3 cycles/mm, and an angular resolution of 23 pixels per degree (PPD). Imaging performance testing based on a diffraction-type waveguide shows a resolution of 57 cycles/mm in the center area and an angular resolution of 33 PPD.
doi_str_mv	10.3390/mi15101198
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subjects	Angular resolution Augmented Reality Design Image quality LCoS pane Lens design Lenses Light magnifying glass Pixels projection lens Sensors waveguide Waveguides
title	Design and Manufacture of 30-Degree Projection Lens for Augmented Reality Waveguide
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