Automatic door sensor
AssigneeOptex Co., Ltd.
InventorsYasuhiro Takada, Akihiro Ikeuchi
Life of this patent
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Abstract
Auxiliary sensors 51, 52 are disposed on exterior and interior side surfaces 31, 32 of a transom 3. The sensors 51, 52 have detection areas A1, A2, B1, B2 which extend through the doorway 2 and which cross each other in a space vertically above a track 10. While detection signals are produced by both auxiliary sensors 51, 52, the door is kept open. If detection signals are produced from only one of the auxiliary sensors 51 (52) uninterruptedly for a predetermined time, the door closing action is allowed to start.
Claims5
An automatic door sensor which detects the presence or absence of an object on a track of an automatic door, comprising:
- a pair of sensor means for detecting an object and producing an object detection signal, if the object locates within a detection area of each sensor means which is defined in a surrounding area of a doorway,
- wherein the detection areas of the respective sensor means partially cross each other on the track or in a space vertically above the track, as viewed from an extension direction of the track;
- and
- control means capable of receiving the object detection signal produced by each of the sensor means,
- wherein the control means recognizes the presence of an object on the track and keeps the door in an open state, only when the control means receives the object detection signals from both of the sensor means.
Dependencies are inferred from the claim text.