The automatically operated door is controlled in dependence upon the presence and movement conditions of one or more persons present on a support surface within a predeterminate space on a predetermined side of the automatically operated door. A radiation source, particularly an infrared radiation source...http://www.google.fr/patents/US5001557?utm_source=gb-gplus-shareBrevet US5001557 - Method of, and apparatus for, controlling the position of an automatically operated door
Method of, and apparatus for, controlling the position of an automatically ...
