| 摘要 |
PURPOSE:To make the recognition state of each individual body accurate by providing plural monitor areas from an objective range of monitoring to a leaving high in series. CONSTITUTION:Plural monitor areas 8a and 8b from the objective range 1 of monitoring to the leaving path are provided in series, transmitting and receiving terminals 2a and 2b are provided in those monitor areas 8a and 8b, and a specific individual body is detected in the inside area 8a between 8a and 8b. Then, the specific individual body is detected in the outside area 8b and at the time of the specific body can not be detected, it is judged that the specific individual body leaves the objective range 1 of monitoring according to an elapse of constant time. |
