| 摘要 |
PROBLEM TO BE SOLVED: To restrain a malfunction based on a secular change in a door sensor. SOLUTION: This door control device of an elevator has a door driving means 12 for driving a door of the elevator, a light projector 4 arranged in one of opposed surfaces of the door and a light receiver 5 arranged on the optical axis of the other light projector of the opposed surfaces, and a door sensor control means 9 for controlling the light projector and the light receiver, and controls opening-closing of the door by detecting an obstacle existing between the opposed surfaces of the door. The door sensor control means drives the door for opening or closing, and determines a distance between the light projector and the light receiver when light receiving output of the light receiver becomes a preset threshold value, and compares the determined distance with a preset distance, and determines the secular deterioration in the light projector or the light receiver. COPYRIGHT: (C)2011,JPO&INPIT
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