JPH0347392B2 - - Google Patents

Description

[Detailed Description of the Invention] In order to open and close an automatic door, an automatic door detector detects infrared rays emitted by objects passing by, and determines the presence or absence of the object and the number of objects passing by. The present invention relates to an automatic door opening/closing control method for controlling the degree of opening and closing of an automatic door, and an automatic door detector used in this method.

An infrared automatic door detector detects whether there is an object emitting infrared light within a certain range near the door entrance, but it simply detects whether there is an object within the detection range. In order to not only detect and open/close the door, but also to prevent the automatic door from being opened unnecessarily, a method as shown in Japanese Patent Application Laid-open No. 57-21682 (particularly, Fig. 3 of the same publication) has been proposed. In this method, four detectors are arranged in the door opening/closing direction and in the direction orthogonal to the door opening/closing direction, and when a detection signal from one detector is input, it is determined that there is only one person passing by, and the door is narrowed rather than fully open. The door is opened to a predetermined opening degree, and when detection signals from a plurality of detectors are input, it is determined that there are a plurality of objects passing by, and the door is fully opened.

However, in general, when there is only one passerby, the passerby often enters the contact point between both doors, that is, the center of the entrance. Since multiple detectors were activated at all times, there was a problem in which the door would always be fully opened when it was determined that there were multiple objects passing by. In addition, in the conventional method, the detector is placed in the direction perpendicular to the door opening/closing direction to detect a considerable distance from the door. There is a fear that a passerby passing at a distance from the door, that is, a passerby who has no intention of passing through the door, may be detected and the door may be opened needlessly. Furthermore, as mentioned above, four detectors must be installed to obtain four detection ranges, and there is a problem in that it takes time and effort to install and adjust these four detectors when installing automatic doors. Ta.

This invention was made in view of the above-mentioned problems, and when a single passerby enters near the center of the entrance/exit, it is possible to determine that the passerby is alone. In addition to positioning and detecting one detection range, the detection range is formed only along the opening/closing direction of the door to avoid detecting objects passing away from the door that have no intention of passing through the door. The technical problem is to obtain an automatic door detector having three detection ranges with one detection range located near the center and forming detection ranges along the opening/closing direction of the door as described above. do. The technical means to achieve this technical problem is to use an automatic door opening/closing control method that opens the door to a predetermined opening degree depending on the number of objects passing through the door. An automatic door detector having two sets of concave mirrors and a first and second detection element is provided, and the first detection element is arranged at approximately the same distance from the two sets of concave mirrors and along the opening/closing direction of the door in front of the door. While forming two detection ranges, the second detection range is
The detection element is arranged so as to be shifted from the first detection element toward one of the concave mirrors, and the detection element is placed in the center of the two detection ranges.
When a passing object enters only the detection range of the second detection element, the door is opened to a predetermined opening degree narrower than fully open, and the passing object enters the detection range of the first detection element. In addition, the door is fully opened when the door is fully opened, and a reflecting mirror consisting of two sets of concave mirrors that converges infrared rays emitted by passing objects is placed approximately equidistant from the two sets of concave mirrors to form two detection ranges. It is composed of a first detecting element and a second detecting element which is shifted in position from the first detecting element toward one of the concave mirrors and forms a detecting range in the center of the two detecting ranges.

An embodiment of the present invention will be described below.
Before describing an embodiment of the automatic door opening/closing control method of the present invention, an embodiment of the automatic door detector of the present invention will be described based on FIG.

The automatic door detector 1 of the present invention includes two concave mirrors 2 arranged side by side in a dome shape on the inner ceiling part.
3, and a light-receiving plate 5 having both end surfaces fixed to the lower inner surface of the box 4 so as to be tilted forward (relative to the direction of entry of passing objects).
and a first detection element 6 which is located below the joining line of the two concave mirrors 2 and 3 above the light receiving plate 5 and which is shifted and fixed in a downwardly inclined direction, and from the first detection element 6 to one concave mirror. The first detection element 6 is automatically detected by the reflection of the two concave mirrors 2 and 3 (indicated by a dashed line in the figure). Detection ranges A and C are formed in front of the door D, and the second detection element 7
By reflection from one concave mirror 2 (indicated by a two-dot broken line in the figure), a detection range B is formed in the central part in front of the door between the detection ranges A and C. Both of the detection elements 6 and 7 are infrared sensors using pyroelectric materials, and have the property of generating an electric charge when infrared rays emitted from passing objects are focused, and this phenomenon can be used to detect passing objects. be exposed. A substance 8 that hardly reflects light is provided on the inner side surface of the box body 4 adjacent to the concave mirror 2, so that the second detection element 7 can detect the light by reflection from the concave mirror 3 (indicated by the two-dot broken line in the figure). This prevents the formation of a range, and the second detection element 7 is configured to have only a detection range B in the center. Moreover, if the concave mirrors 2 and 3 are made by agglomerating a thin aluminum film by vacuum deposition on the concave surfaces of molded plastics, the economical efficiency can be improved.

Next, an embodiment of an automatic door control method for controlling the door to two different opening degrees, fully open and half open, using such a detector 1 will be described with reference to FIG.

First, as shown in FIG.
is installed in the blind area E above the automatic door D, and the detection range A,
Form B and C. When a passing object enters the central detection range B, the second detection element 7 collects the infrared rays emitted by the passing object through the reflection of the concave mirror 2. When an on signal is sent to the half-open switch 10 of the hot wire switch converter 9, electrical conduction occurs between 11 and 12, and the door D opens. At this time, the flip-flop 13 in the circuit remains reset, and when Q is 1 and the half-open limit switch 14 installed in the half-open position is turned on, the NAND gate 1 is turned on.
5 becomes 0, and the door D stops at the half-open position. When a plurality of objects or a single object enters from the side, it crosses the left and right detection ranges A and C, so the flip-flop 13 is set and Q becomes 0.
The output of the NAND gate 15 is kept at 1, and the door D is not opened half-open, but the door D is fully opened. Both the full-open switch and the half-open switch 10 are turned off, and the door D begins to close. When the half-open limit switch 14, which had been on until then, is turned off, the flip-flop 1 is activated by the pulse generated by the falling edge of the half-open limit switch 14.
3 and return to the initial state.

As is clear from the above explanation, in the control method of the present invention, three detection ranges are formed around the center of the entrance/exit, so a passing object entering near the center of the entrance/exit is detected only in the center detection range. Since the door is detected, the door can be opened to a predetermined opening degree narrower than fully open, and unnecessary opening of the door can be prevented. In addition, since the detection range is formed along the door in the opening/closing direction, it is possible to prevent objects passing a little distance from the door that have no intention of passing through the door from being detected.
This prevents the door from being opened unnecessarily. Furthermore, the automatic door detector of the present invention combines a reflecting mirror consisting of two sets of concave mirrors and two detection elements to form a central detection range and detection ranges on both sides of the central detection range, and detects traffic with one detector. Since it can determine whether a body exists in the central detection range or in the detection ranges on both sides of the outside, it is economical because the installation and adjustment of the detector only needs to be done once when installing an automatic door. It is.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the detector of this invention, and FIG. 2 is a front view of an automatic door using the control method of this invention.
FIG. 3 shows circuit diagrams of a half-open hot wire switch converter, respectively. 1... Automatic door detector, 2, 3... Concave mirror, 4
... Box body, 5 ... Light receiving plate, 6 ... First detection element,
7...Second detection element, 9...Full/half open heat wire switch converter, A, B, C...detection range, D...door.

Claims (1)

[Claims] 1. In an automatic door opening/closing control method in which the door is opened to a predetermined opening degree depending on the number of objects passing through the door, two sets of concave mirrors and a first mirror are provided above the door entrance. , an automatic door detector having a second detection element is provided, and the first detection element is arranged at approximately the same distance from the two sets of concave mirrors, and the second detection element is arranged on the front side of the door along the opening/closing direction of the door.
one detection range is formed in the center of the two detection ranges by arranging the second detection element to be shifted from the first detection element toward one of the concave mirrors, and the second detection When a passing object enters only into the detection range of the element, the door is opened to a predetermined opening degree narrower than fully open, and when a passing object enters the detection range of the first detection element, the door is fully opened. Automatic door opening/closing control method. 2. A reflecting mirror consisting of two sets of concave mirrors that converges infrared rays emitted by passing objects, and a first mirror disposed approximately at the same distance from the two sets of concave mirrors to form two detection ranges.
An automatic detection device comprising: a detection element; and a second detection element, which is arranged to be shifted from the first detection element toward one of the concave mirrors to form a detection range in the center of the two detection ranges. Door detector.