| 摘要 |
PROBLEM TO BE SOLVED: To easily align collimation with an automatic door at the time of installation, allow a wiring work without any damage to appearance, and ensure the detection of a substance existing on a door track. SOLUTION: This device has one or two doors 1A and 1B slidable along the constant track for opening and closing a door passage 5. Also, opposed closing planes 7b and 7b are formed out of the two doors 1A and 1B or a mullion. Furthermore, a case 8 having a light emitting element 10 for generating a beam for substance detection and a light receiving element 11 for receiving a beam from the light emitting element 10 is mounted on the vertical frame of the doors 1A and 1B or the mullion. An optical path is is formed between the opposite closing planes 7b and 7b, so as to be directed from the light emitting element 10 toward the light receiving element 11. |
