Nabtesco Corporation

Yoshinari Kiyomasa

Koji Kakuyama

Shigeaki Sasaki

Tomohiro Hamakubo

Junichi Matsunaga

Hiroto Okada

A light-emitter emits light into a door opening of an automatic door system. A light-receiver receives light from the light-emitter which has passed through the door opening and develops a light-reception indicative signal. A door controller causes the light-emitter to stop emitting light and, thereafter, start emitting light. An auxiliary sensor is judged to be operating in order when the light-receiver does not develop light-reception indicative signal in a state where the light-emitter is not emitting light, and, thereafter, develops a light-reception indicative signal when the light-emitter resumes emitting light; otherwise, the auxiliary sensor is judged to be out of order.

Automatic door system with sensor used therein

Whether interruption is present in the connections of automatic door constituting units is detected. A plurality of automatic door constituting units (and) are interconnected in such a manner that they can communicate with each other via a bus (). The automatic door constituting units include a door controller () for controlling opening and closing of a door. The door controller () successively calls the other automatic door constituting units one by one via the bus (), and the other automatic door constituting units send a response to the calling via the bus (). The door controller () judges that the automatic door constituting unit the door controller () called is disconnected from the bus (), when said called automatic door constituting unit does not send a response within a predetermined time after the calling.

Growing community of inventors

Kobe, Japan

Yoshinari Kiyomasa