| 摘要 |
PURPOSE:To acquire heat rays from a wide area by arraying plural Fresnel lenses in front of a heat sensor in a building window glass shape. CONSTITUTION:A spherical head cover 3 is molded out of polyethylene while united with Fresnel lenses 2. Thus, the Fresnel lens group is formed in three dimensions so that the entire area where a body to be detected can move can be monitored; and the Fresnel lenses 2 are arranged in the building window glass shape in front of the heat sensor. Further, the positions where the Fresnel lenses 2 are embedded are selected at the time of the molding according to the movable area of the body to be detected, thereby reducing nondetection and misinformation. |
