Comparison of Divergence Angle of Retro-Reflectors and Sharpness with Aerial Imaging by Retro-Reflection (AIRR)

Norikazu KAWAGISHI  Kenta ONUKI  Hirotsugu YAMAMOTO  

IEICE TRANSACTIONS on Electronics   Vol.E100-C   No.11   pp.958-964
Publication Date: 2017/11/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E100.C.958
Type of Manuscript: INVITED PAPER (Special Section on Electronic Displays)
aerial image,  retro-reflector,  divergence angle,  sharpness,  contrast transfer function,  

Full Text: FreePDF

This paper reports on the relationships between the performance of retro-reflectors and the sharpness of an aerial image formed with aerial imaging by retro-reflection (AIRR). We have measured the retro-reflector divergence angle and evaluated aerial image sharpness by use of the contrast-transfer function. It is found that the divergence angle of the retro-reflected light is strongly related to the sharpness of the aerial image formed with AIRR.