| 摘要 |
<p>PROBLEM TO BE SOLVED: To inexpensively prevent the detection leakage of a baggage by providing a photosensor unit consisting of a light-projecting element or a photodetector of a transmission-type photosensor and a reflection-type photosensor for applying light to farthest and nearest corners on an opposite side surface at a center part on the left and right side surfaces of a locker box. SOLUTION: Photosensor units 1 and 2 are placed at center parts on right-and left-side surfaces 741 and 742 in a locker box 7, respectively, where the photosensor units are composed of the light-projecting element or the photo detector of a transmission-type photosensor and a pair of a reflection-type photosensors. Irradiation light 401 and 404 from the reflection-type sensor at the side a unit 1 is reflected by reflection tapes 301 and 303 of farthest and nearest corners on the left-side surface, and reflected light 402 and 404 are received by the unit 1. In the same manner, radiation light 411 and 413 from the reflection-type photosensor of a unit 2 is reflected by reflection tapes 304 and 305, and is received by the unit 2. When light is being received by the transmission-type photosensor and a total-reflection-type sensor, it is judged that there is no baggage in the box 7. On the other hand, if even a single sensor is receiving light, it is judged that there is the baggage.</p> |
