| 摘要 |
PROBLEM TO BE SOLVED: To provide a door system which prevents false detection and can be easily built in an existing facility.SOLUTION: The door system includes an irradiation part 21 having a light source 212 and a floodlighting optics unit 213 for limiting an irradiating range of an irradiating light in a depth direction B in a passing space 11, a light receiving part 22 for receiving light from the passing space and a determination part 24 for calculating the difference between temporally different signals and using the calculated differential signal as criteria about signals transmitted by the light receiving part. A detection region 235 in the passing space is within a range where an irradiating range 215 of the irradiating light by the irradiating part and a light receiving range 225 of the light receiving part are overlapped. |
