| 摘要 |
PROBLEM TO BE SOLVED: To provide a simplified passage limitation device which has an inexpensive and simple configuration and which enables only an individual unspecified passage-permitted person to easily pass through a passage limitation area.SOLUTION: A simplified passage limitation device 1 includes a detection unit 2 which detects the presence or absence of an object, and a regressive reflector 3 which is an object possessed by only an individual unspecified passage-permitted person H getting into/out of a passage limitation area R via detection areas E1 and E2. A threshold of the detection unit 2 is set higher for detection of the regressive reflector 3 than for detection of an ordinary object. An opening/closing body 20 in the passage limitation area R is opened by detection of the regressive reflector 3 by the detection unit 2 to permit the passage of only the passage-permitted person H. |
