JP2002131450A - Optical sensor for automatic door and opening and shutting control method for automatic door - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize setting a monitoring area at both sides of an automatic door by one optical sensor, where movement of a human and movement of an automatic door can be distinguished. SOLUTION: In an optical sensor for an automatic door that includes a light emitting part 10 which radiates light to a monitoring area with a prescribed area that is set from the upper position of an automatic door to a floor face and a light receiving part 20 that receives the reflection light from the monitoring area, the light emitting part 10 is provided with a plurality of light emitting devices 120 that irradiate spot light into the monitoring area with a prescribed arrangement through the same monocular lens 11 and herewith the light receiving part 20 is provided with a plurality of light receiving devices 220 so that one light receiving device corresponds to one of light emitting devices 12. Then a detected substance can be detected in every spot unit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic door optical sensor and an automatic door opening / closing control method. More specifically, the present invention can detect not only the presence of an object to be detected but also its moving direction. The present invention relates to an automatic door optical sensor and an automatic door opening / closing control technology using the optical sensor.

[0002]

2. Description of the Related Art An optical sensor for an automatic door includes a light emitting section for irradiating light toward a floor near a door, and a light receiving section for receiving the reflected light, and a light receiving level (light receiving amount) at the light receiving section. , An object to be detected such as a person is detected. The light receiving level changes not only for humans and animals but also for moving objects.
For example, the light receiving level changes depending on the movement of the automatic door itself.

Therefore, as shown in FIG. 8, conventionally, assuming that the automatic door 1 is of a sliding door type, in order to prevent the movement of the automatic door 1 from being picked up, optical sensors are respectively provided on the indoor side and the outdoor side. 2, 2 and a predetermined number of auxiliary sensors 3 for irradiating a light beam as a safety light beam in the horizontal direction are provided between the monitoring areas.

As another prior art, the applicant of the present invention disclosed in Japanese Patent Application Laid-Open No. H11-31060, for example, for use in a medium-to-high-rise apartment house, from the viewpoint of security, release of a magnetic card, a personal identification number, etc. when entering a building. An automatic door opening and closing system that opens the automatic door with a key and detects the direction of movement of the person trying to exit by using a door sensor when leaving the building, and does not particularly operate the release key etc. is suggesting.

With reference to FIG. 8, according to this automatic door opening / closing system, a plurality of (four in this example) optical sensors 2 are provided only on the indoor side, and each optical sensor 2 makes FIG. In this manner, four rows of monitoring areas L1 to L4 are set in parallel with the automatic door 1. The detection signal of each optical sensor 2 is given to a CPU as control means (not shown), and the CPU determines the moving direction of the person based on the appearance of the detection signal from each optical sensor 2 in time series, and opens and closes the automatic door. Control.

That is, when the detection signals from the optical sensors 2 appear in the order of L4 → L3 → L2,
The automatic door 1 is opened when it is determined that a person is going out, and otherwise the automatic door 1 is not opened. According to this,
For example, even if an advertisement flyer or a flyer is inserted through a gap in the door to illegally open the door, the automatic door 1 does not open.

[0007]

However, in the optical sensor 2 used in each of the above-mentioned prior arts, more spot light is obtained with a smaller number of elements by using a split lens. The moving direction of the detection object can be detected only in units of columns.

Although it is theoretically possible to obtain reflected light information in spot light units by obtaining a detection signal from each of the light receiving elements, in the case of a split lens,
It is extremely difficult, and in practice, impossible to determine from where on the floor the reflected spot light arrived.

Therefore, the conventional optical sensor 2 cannot distinguish the movement of a person or the like from the movement of the automatic door 1 (opening / closing operation).
The optical sensor 2 must be installed so as not to pick up the movement of the light.

That is, when monitoring both the indoor side and the outdoor side as in the conventional example described with reference to FIG. 8, an optical sensor 2 is required for each of them. In addition, since the auxiliary sensor 3 for safety is required, the cost is high as a whole, and a reduction in cost has been demanded.

Further, the auxiliary sensor 3 cannot be physically installed on the door rail, and is installed at a position off the door rail, that is, on the side of the cubic room (or the outside of the room). It is a dead zone and dangerous.

[0012]

According to the optical sensor for an automatic door of the present invention, an object to be detected can be detected in spot light units. Therefore, the movement of a person or the like and the movement of the automatic door can be distinguished, and a monitoring area can be set on both sides of the automatic door with one optical sensor, so that an auxiliary sensor for safety is not required.

That is, a first aspect of the present invention provides a light emitting unit for irradiating light from a position above an automatic door to a monitoring area having a predetermined area set on a floor, and receiving reflected light from the monitoring area. In an optical sensor for an automatic door including a light receiving unit,
The light emitting unit includes a plurality of light emitting elements that irradiate spot light with a predetermined arrangement in the monitoring area through the same monocular lens, and the light receiving unit includes one light emitting element with respect to one of the light emitting elements. A plurality of light receiving elements are provided so as to correspond to one light receiving element, and the object to be detected can be detected in units of the spot light.

As described above, since the detection can be performed in spot light units, not only the movement of the detected object in the direction perpendicular to the door (the direction of approaching / separating from the door) but also the oblique direction with respect to the door and It is also possible to detect a movement in a parallel direction and the like, and it is possible to know a moving trajectory of the detected object. Further, the size and number of the detected object can be detected.

Next, a second aspect of the present invention is that the automatic door is a sliding door type transparent door, and a light emitting section for irradiating light from an upper position of one passage side space of the door toward a floor surface and a reflected light thereof. An automatic door opening / closing control method comprising: an optical sensor having a light receiving portion for receiving light; and control means for controlling opening and closing of the door based on an object detection signal from the optical sensor. A plurality of light-emitting elements for irradiating spot light with a predetermined arrangement through the same monocular lens, and a plurality of light-emitting elements corresponding to one of the light-emitting elements corresponding to the other light-receiving element. The light receiving element is provided, using a specific light sensor capable of detecting the object to be detected in the unit of the spot light, from the one passage side space to the other passage side floor surface separated from the door in parallel with the door. Supervisor An area is set, and the control means closes the door when closing the door only when the time series of the object detection signal output from the specific light sensor is along the direction in which the door is closed. It is characterized by.

According to the optical sensor for an automatic door, since the movement of the automatic door itself can be determined, the floor surface on the other passage side separated from the automatic door by the one specific optical sensor can be used. , The monitoring area can be set. In addition, since the automatic door is provided not only at the entrance of the building but also at the entrance of the corridor or the room in the building, one passage side space is not limited to the indoor side and the other passage side is not necessarily the outdoor side.

In the second aspect of the present invention, for example, in the case where it is not desired to enter a person freely for security reasons, even if an object detection signal is output from the specific optical sensor when the door is closed, What is necessary is just to keep the said door closed. In some cases, an alarm may be generated.

A third aspect of the present invention is an automatic door opening / closing control method using the automatic door opening / closing system described in the above-mentioned prior art and the specific optical sensor in combination, and comprises a plurality of optical sensors and their respective optical sensors. Control means for controlling the opening and closing of the door based on an object detection signal from the door, and the optical sensor detects the door from the floor on the one passage side to the floor on the other passage side separated from the door. A plurality of rows of monitoring areas are set in parallel with each other, the specific sensor is assigned to a door adjacent monitoring area adjacent to the door on the other passage side, and each of the optical sensors is assigned to a monitoring area on the one passage side. When the time series of the object detection signal output from the object is in the order of the direction in which the detected object approaches the door, an open signal is given to the automatic door, and when the door is closed, the specific light Out of sensor Time series of the object detection signal only if the along the direction in which the door is closed, and as it is characterized by closing the door.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, referring to FIGS. 1 and 2, an embodiment of an optical sensor for an automatic door according to the present invention will be described.

This optical sensor has almost the same element arrangement,
A light emitting unit 10 and a light receiving unit 2 which are symmetrically arranged as a left and right pair.
0. FIG. 1A is a front view schematically illustrating the configuration on the light emitting unit 10 side, FIG. 1B is a front view schematically illustrating the configuration on the light receiving unit 20 side, and FIG. FIG. 2B is a side view of the light emitting unit 10, and FIG.

In the present invention, the lens system of the light emitting section 10 is not a split lens but a monocular lens 11, and a light emitting element group 12 having a plurality of light emitting elements composed of, for example, light emitting diodes is provided for the monocular lens 11. ing.

In this embodiment, as shown in the side view of FIG.
4 as shown in the front view of FIG. 1 (a).
(121 to 126) are included. That is, 24 light emitting elements 120 are arranged in a matrix on one monocular lens 11.

The light emitted from each light emitting element 120 passes through the center of the monocular lens 11 and irradiates on the floor F as a spot, as shown in FIG. In FIG. 3, for convenience, the column code L1 of the light emitting element group 12 is assigned to the reference number of each column to which each spot light radiated on the floor F belongs.
, L4,..., L4, and SP1 to SP6.

In each of the rows L1 to L4, for example, the spot light SP1 is from the light emitting element 121, and the spot light SP
P2 is from the light emitting element 122. Hereinafter, similarly, the spot light SP3, the light emitting element 123, and the spot light SP4
And light emitting element 124, spot light SP5 and light emitting element 12
5. The spot light SP6 and the light emitting element 126 correspond to each other.

Similarly to the light-emitting unit 10, the light-receiving unit 20 includes a monocular lens 21 as its lens system.
For one, a light receiving element group 22 having a plurality of light receiving elements composed of, for example, photodiodes is provided in the same arrangement as the light emitting element group 12.

That is, as shown in the side view of FIG. 2B, the light receiving element group 22 also has a four-row configuration of L1 to L4, and each row has the configuration shown in FIG. Like
Each includes six light emitting elements 220 (221 to 226). That is, 24 light receiving elements 220 are arranged in a matrix in one monocular lens 21, and a detection signal of each light receiving element 220 is given to the CPU 30 as automatic door control means.

The light emitting section 10 and the light receiving section 20 are arranged symmetrically. Therefore, for example, the light receiving element 221 receives the reflected light of the spot light SP1 emitted from the light emitting element 121, and the light receiving element 222 is the light emitting element. The reflected light of the spot light SP2 emitted from the light receiving unit 122 is received. Hereinafter, similarly, the light receiving element 223 includes the light emitting element 123 and the light receiving element 224.
Is the light emitting element 124 and the light receiving element 225 is the light emitting element 125
, And the light receiving element 226 corresponds to the light emitting element 126 in a one-to-one relationship.

Next, an embodiment in which the optical sensor C having the light emitting section 10 and the light receiving section 20 is installed in an automatic door will be described with reference to FIGS. In this embodiment, the automatic door is composed of two sliding doors 1,
4 is a front view, FIG. 5 is a side view, and FIG. 6 is a perspective view.

The optical sensor C is installed at an upper portion of one of the spaces of the passage partitioned by the doors 1 and 1, and irradiates light from there to a monitoring area on the floor. In this embodiment,
The optical sensor C is installed on the indoor side of the automatic door 1A.

The optical sensor C sets four rows of monitoring areas L1 to L4 parallel to the doors 1 and 1. Each monitoring area L1 to L4
Includes six spot lights SP1 to SP6.
In this case, the monitoring area L1 of the first row among the monitoring areas L1 to L4 of the four rows is set on the floor FO outside the room, across the doors 1, 1 from the room side. The remaining monitoring areas L2 to L4 in the second to fourth rows are set on the floor FI on the indoor side.

The CPU 30 controls the opening and closing of the doors 1 and 1 in units of rows of the monitoring areas L1 to L4 and also controls the units of each light receiving element 220. As an example, as in the automatic door opening / closing system described in the above-mentioned prior art, a person who opens the automatic door with a release key such as a magnetic card or a password when entering a building and tries to exit when exiting the building. The control operation of the CPU 30 in the case where the automatic door is opened by detecting the moving direction of the CPU 30 will be described with reference to the flowchart of FIG.

First, in step S1, the CPU 30 determines whether or not the doors 1, 1 are closed. If the door is closed, it is determined in the next step S2 whether or not there is an object detection signal from the optical sensor C. If there is no object detection signal, the doors 1 and 1 are kept closed (step S7).

If there is an object detection signal from the optical sensor C in step S2, it is determined in step S3 which of the monitoring areas L1 to L4 the object detection signal is from. , The object detection signal is the first outdoor signal
If it is from the monitoring area L1 in the row, the doors 1 and 1 are kept closed (step S7). In some cases, for example, an alarm may be issued for security of the building.

If the object detection signal is not from the monitoring area L1 in the first row on the outdoor side, step S4
To determine the moving direction of the object. In other words, if the appearance of the object detection signal is in the order of the monitoring area L4 in the fourth column → the monitoring area L3 in the third row → the monitoring area L2 in the second row, the moving direction of the object is the door. It is determined that the direction is approaching 1, 1 and that a person is going to go out, and the doors 1, 1 are opened (step S8). If not, the doors 1 and 1 are kept closed (step S7).

When the doors 1, 1 are opened, step S1
Then, the process proceeds to step S5, where it is determined whether an object detection signal is output from the monitoring area L1 in the first column and the monitoring area L2 in the second column. That is, it is determined whether there is an object (person) near the door rail, and if there is an object detection signal, the doors 1 and 1 are kept open (step S).
8).

If there is no object detection signal in step S5,
The CPU 30 attempts to close the doors 1 and 1. At this time, in step S6, the CPU 30 monitors the appearance of the object detection signal from the light receiving elements 221 to 226 that cover the monitoring area L1 in the first column on the outdoor side. Then, it is determined whether the doors 1, 1 can be closed.

Referring to FIG. 6, in this embodiment,
When the doors 1 and 1 are double-opened, when they are closed, one left door 1 blocks the spot light of the monitoring area L1 in the first row in the order of SP1 → SP2 → SP3, and the other right door 1 Similarly, the spot light in the monitoring area L1 in the first column is blocked in the order of SP6 → SP5 → SP4.

Therefore, in step S6, the CPU 30 determines that the appearance of the object detection signal from the monitoring area L1 in the first column is SP1 → SP2 → SP3 and SP6 → SP
If the order is 5 → SP4, it is determined that this is due to the movement of the doors 1, 1, and the doors 1, 1 are closed (step S9). Otherwise, it is determined that there is something on the door rail, and the doors 1 and 1 are kept open (step S8).

As described above, according to the present invention, one optical sensor C can monitor both sides of the door and control automatic door opening and closing. Therefore, a safety light beam (light beam) as a secondary detection means which has been conventionally installed on a framing or the like becomes unnecessary. Conventionally, the open / close state of the door 1 is detected by a limit switch or the like.
According to the present invention, since the open / closed state of the door 1 can be detected by the optical sensor C itself, it is unnecessary.

In the above embodiment, all the monitoring areas L1
Since the light sensor C capable of detecting an object in units of the spot light SP is used for L4, the moving direction of the object is not limited to the direction of simply approaching / separating from the door 1, but the direction is orthogonal. Direction, oblique or even parallel can be detected.

The planar size of the object, for example, a person and a trolley, can be identified by the number of spot lights blocked by the object. Further, the number of objects existing in the monitoring area can be recognized.

Although the present invention has been described with reference to the above embodiment, the present invention is not limited to this. For example, the door 1 may be of a one-sided type. The monitoring area is not limited to four rows. Also, the number of light emitting elements, the number of light receiving elements, and the number of spot lights are not limited. The optical sensor C may be installed outside the room. The optical sensor C of the present invention may be used only in the monitoring area set by blocking the door, and the other optical sensor may be an optical sensor using a split lens capable of detecting only a row unit.

Further, it is possible to identify not only the moving direction of the object (person) leaving the building but also the moving direction of the object trying to enter the building. Furthermore, the present invention is naturally applicable not only to automatic doors provided at doorways of buildings, but also to automatic doors in buildings.

[0044]

As described above, according to the optical sensor for an automatic door of the present invention, an object to be detected can be detected in spot light units. Therefore, the movement of a person or the like and the movement of the automatic door can be distinguished by one optical sensor, the monitoring area can be set on both sides of the automatic door, and an auxiliary sensor for safety is not required.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing a light emitting unit and a light receiving unit of an optical sensor for an automatic door according to the present invention.

FIG. 2 is a schematic side view of the light emitting unit and the light receiving unit.

FIG. 3 is a plan view showing an arrangement state of spot lights emitted from the light emitting unit to a monitoring area on a floor surface.

FIG. 4 is a front view schematically showing a state where the optical sensor is installed on an automatic door.

FIG. 5 is a schematic side view of FIG.

FIG. 6 is a schematic perspective view of FIG.

FIG. 7 shows a CP in the automatic door opening / closing control method of the present invention.
9 is an operation flowchart for explaining a control operation of U.

FIG. 8 is a schematic side view showing a first conventional example.

FIG. 9 is an explanatory diagram for explaining a second conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Door 1A Eyeless 10 Light emitting part 11 Monocular lens 12 Light emitting element group 120 (121-126) Light emitting element 20 Light receiving part 21 Monocular lens 220 (221-226) Light receiving element 30 CPU L1-L4 Monitoring area SP Spot light F Floor surface

Claims (4)

[Claims] An automatic light-emitting unit that emits light from a position above an automatic door toward a monitoring area having a predetermined area set on a floor; and a light-receiving unit that receives light reflected from the monitoring area. In the door light sensor, the light emitting unit includes a plurality of light emitting elements that irradiate spot lights in a predetermined arrangement within the monitoring area through the same monocular lens, and the light receiving unit includes the light emitting element. A light sensor for an automatic door, wherein a plurality of light receiving elements are provided so that one light receiving element corresponds to one of the elements, and an object to be detected can be detected in spot light units. 2. The automatic door is a sliding door type transparent door,
An optical sensor having a light emitting unit for irradiating light from an upper position of one of the passage side spaces of the door toward the floor surface and a light receiving unit for receiving the reflected light, and based on an object detection signal from the optical sensor, An automatic door opening / closing control method comprising: a control unit that controls opening / closing of the door. The light sensor includes a plurality of light emitting elements that irradiate the light emitting unit with spot light in a predetermined arrangement through the same monocular lens as the light sensor. A plurality of light receiving elements are provided such that one light emitting element corresponds to one of the light emitting elements in a light receiving unit of the other party, and a specific light sensor capable of detecting an object to be detected in spot light units is used. The monitoring area is set in parallel with the door from the one passage-side space to the floor on the other passage side that separates the door. Time series of the object detection signal al outputted only when the direction in which the door is closed, as opening and closing control method of an automatic door, characterized in that closing the door. 3. The apparatus according to claim 2, wherein the control means keeps the door closed even if an object detection signal is output from the specific optical sensor when the door is closed. Automatic door opening and closing control method according to the above. 4. The automatic door is a sliding door type transparent door,
A plurality of optical sensors having a light emitting unit for irradiating light from the upper position of one of the passage side spaces of the door toward the floor and a light receiving unit for receiving the reflected light, and an object detection signal from each of the above optical sensors. A control means for controlling the opening and closing of the door based on the light sensor, wherein each of the optical sensors detects a floor on the other passage side that separates the door from the floor surface on the one passage side. A plurality of rows of monitoring areas are set in parallel with the door over the surface, and the specific light sensor that covers the door adjacent monitoring area adjacent to the door on the other passage side is connected to the light-emitting unit through the same monocular lens. A plurality of light-emitting elements for irradiating spot light with a predetermined arrangement in the door adjacent monitoring area are provided, and one light-receiving element corresponds to one of the light-emitting elements on the other light-receiving section, A plurality of light receiving elements capable of detecting an object to be detected in spot light units are provided, and the control means is adapted to detect an object detection signal output from each of the optical sensors covering the monitoring area on the one passage side. When the sequence is in the order of the direction in which the detected object approaches the door, an open signal is given to the automatic door, and when the door is closed, an object detection signal output from the specific light sensor is output. An automatic door opening / closing control method, wherein the door is closed as it is only when the time series is along the direction in which the door is closed.