| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the following problem: the conventional retroreflective sheet cannot exhibit the retroreflective property with only incident light as an object, the incident light being incident from a specified direction, such as sun rays coming from the cosmic space. <P>SOLUTION: A retroreflective member includes a condenser lens array which is formed by arraying condenser lenses including incident side lenses and exit side lenses disposed in pairs on both faces of a plate-like base member, and a concave reflecting mirror array including concave reflecting mirrors with focal planes of incident light incident from a specified direction along the optical axis of the condenser lenses as mirror planes, correspondingly to the respective condenser lenses. The light incident from the specified direction is transmitted through the condenser lens array and reflected by the concave reflecting mirror array, and thereby, retro-reflected into the specified direction. <P>COPYRIGHT: (C)2011,JPO&INPIT |
