Automatic door sensor
AssigneeOptex Co., Ltd.
InventorsYasuhiro Takada, Akihiro Ikeuchi
Life of this patent
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Abstract
Auxiliary sensors 51 and 52 are disposed on exterior and interior side surfaces 31 and 32 of a transom 3. The sensors 51 and 52 have detection areas A1, A2, B1 and 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 and 52, the door is kept open. If detection signals are produced from only one of the auxiliary sensors 51 and 52 uninterruptedly for a predetermined time, the door closing action is allowed to start.
Claims17
An automatic door sensor which detects presence of an object on a track on an automatic door, comprising:
- a pair of sensor means for detecting an object and producing an object detection signal if the object is located within detection areas of each of said pair of sensor means, which detection area is defined in a surrounding area of a doorway, wherein said detection areas of respective ones of said pair of 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
- a control means capable of receiving the object detection signal produced by each of said pair of sensor means for recognizing presence of the object on the track and maintaining the door in an open state only when said control means receives the object detection signal from both of said sensor means.
An automatic door sensor for detecting presence of an object in a track of an automatic door, comprising:
- a first sensor operable to detect an object and produce a first object detection signal, said first sensor having a first detection area that is defined within a surrounding area of a doorway of the automatic door;
- a second sensor operable to detect an object and produce a second object detection signal, said second sensor having a second detection area that is defined within a surrounding area of the doorway of the automatic door;
- wherein said first detection area and said second detection area partially cross each other on a track of the automatic door or in a space vertically above the track as viewed from an extension direction of the track;
- and
- a controller to receive the first object detection signal and the second object detection signal from said first sensor and said second sensor and to recognize presence of an object on the track and maintain the automatic door in an open state only when the controller receives both the first object detection signal and the second object detection signal.
Dependencies are inferred from the claim text.