Patent ID: 9201177
Filing Date: 2015-12-01
Classification: G02B

Abstract:
1. An installation structure of a safety confirmation mirror at an indoor T-shaped intersection, in which a front end of a passageway is connected to a side of another passageway crossing the front of the passageway, which comprises: a pair of Fresnel mirrors which is installed on a wall surface of the side of the other passageway separately to each side of right and left in relation to the widthwise center of the passageway; wherein each of the pair of the Fresnel mirrors has a reflective surface in which a widthwise center of each concentric circle in the Fresnel mirrors is offset towards an opposite-side edge from one side edge; the distance between the opposite-side edge of the reflective surface and the widthwise center of the each of the Fresnel mirrors is not more than 100 mm; and the pair of the Fresnel mirrors are installed so that each of the opposite-side edges is opposite each other and located closer to the widthwise center of the passageway than to each of the one side edges.