Abstract
Aerial sign is prospective for a new digital signage, because it enables sign messages to float in the required position without interruption of walking through of people. We have proposed Aerial Imaging by Retro-Reflection (AIRR) [1]. By utilizing retroreflection, AIRR can form an aerial real image of a light source as shown in Fig. 1. We have realized AIRR by using two types of retroreflective elements, that is, micro-beads type and prism type, of which retroreflective characteristics are different.
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