JP3421699B2 - Obstacle detection device for automatic door - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an obstacle detecting device for an automatic door, and more particularly to an obstacle detecting device for an automatic door having a reflecting means.

[0002]

2. Description of the Related Art It is necessary to reliably detect the presence of an obstacle in a detection area in order to ensure safe traveling of an automatic door so that an object or a person is not caught in the door when the automatic door is opened or closed. As such a technique, the technique described in JP-A-6-138253 is conventionally known.

In this technique, a structure is provided in which a light emitting device and a light receiving device for receiving a light beam from the light emitting device are provided on the opening / closing surface of an automatic door, and reflectors for reflecting the light beam are installed on both sides of the opening / closing surface. Has been done. The reflector used here is configured by combining a plurality of them, and before and after the opening and closing of the automatic door, the light beam before being reflected,
The angle of each reflector is adjusted so that it travels in parallel with the light beam after reflection and at a shifted position.

[0004]

By the way, generally, in a detecting device having a reflecting mirror, a high precision is required for the installation angle of the reflecting mirror, and when the door is opened, the Required accuracy of direction is ± 0.4
It becomes degree. From this point of view, the above-mentioned structure of the related art requires a higher precision, which is virtually impossible to achieve due to the door manufacturing precision. Furthermore, because the door frame is made of sheet metal,
It is difficult to achieve the above accuracy. In addition, in the related art, it is possible that the projected light does not reach the light receiving portion due to the shaking during traveling that occurs when the door is moved, the mounting error of the reflecting mirror, or the like.

The present invention has been made to solve these problems, and it is possible to detect the presence of an obstacle in a detection area with a simple structure without requiring high accuracy in the installation angle of the reflector. It is an object of the present invention to provide an obstacle detection device for an automatic door that can perform the following.

[0006]

In order to achieve the object of the present invention, an obstacle detection device for an automatic door according to the present invention comprises a projector and a light receiver arranged at a predetermined interval on one of the opening and closing surfaces of the automatic door. And a second reflecting means disposed on the other opening / closing surface for reflecting the light projected from the light projector, and a second reflecting means for guiding the reflected light to the light receiver. In the detection device including the reflecting means, at least one of the first reflecting means and the second reflecting means is characterized by being configured by a convex mirror. Alternatively, it is characterized in that at least one of the first reflecting means and the second reflecting means is provided with a concave lens at a position on the front side of reflection of light or a position on the rear side of reflection of the light.

The convex mirror is preferably a spherical surface, a parabolic surface, an elliptical surface, or a cylindrical surface, but of these, the cylindrical surface is most preferable.
This is because, in this detection device, since the angle after reflection of light has a sufficient margin in the vertical direction, it is sufficient to adopt a configuration in which the margin in the horizontal direction is expanded. That is, a cylindrical surface is optimal because the reflected light spreads only in the left-right direction.

As described above, the first reflecting means and the second reflecting means
At least one of the reflecting means of the above is configured by a convex mirror, or by providing a concave lens at the position on the front side or the rear side of the light of at least one of the reflecting means, a The light can be magnified before or after reflection, or before and after reflection.

[0009]

1 is a diagram showing an overall configuration of an embodiment of the present invention, FIG. 2 is a diagram showing a configuration example of a reflecting member applied to FIG. 1, and FIG. FIG. Further, FIG. 5 is a diagram for explaining the influence of the distance and reflected light when the light projector and the light receiver are attached to the same door. Embodiments of the present invention will be described below with reference to these drawings.

In the present embodiment, the case where the present invention is applied to a double-opening automatic door is shown. The automatic doors 6a and 6b have opening / closing surfaces 60a and 60b, respectively, and are brought into close contact / separation with each other via the opening / closing surfaces. Opening / closing surface 60b of this automatic door 6b
A light projector 1 that projects a light projection beam toward the opening / closing surface 60 a and a light receiver 2 that receives the light projected from the light projector 1 are arranged at a predetermined distance from the light projector 1.

When the light projector 1 and the light receiver 2 are arranged on the same door in this way, the distance between the light projector 1 and the light receiver 2 must be set appropriately. For example, when the distances are close to each other, the object to be detected hits the object if the object to be detected is between the light projector 1 and the light receiver 2 and the reflection mirrors 4 and 5, but near the light projector 1 and the light receiver 2. The light is reflected by this object, and the reflected light is incident on the light receiver 2, so that it may occur that the light cannot be detected while being blocked. That is, it is necessary to separate the light projector 1 and the light receiver 2 to the extent that such an influence is eliminated.

This point will be described with reference to FIG. The figure to the projector P having a light projecting angle theta _1, photodetector R ₁ having a light-receiving angle theta ₂ which is arranged at a distance a from the projector P, the light receiving disposed from the projector P at the distance b Assuming a light receiver R ₂ having an angle θ ₃ , the object O ₁ located at a distance d ₁ from the opening / closing surface 50 of the automatic door on which the projector P and the light receivers R ₁ and R ₂ are installed, and d from the door opening / closing surface.
The action of the reflected light of the object O ₂ at a distance of ₂ (however, d ₁ <d ₂ ) is shown. As is clear from this figure, when the object is close to the projector P side (when the distance is d ₁ from the door opening / closing surface), the reflected light from the object is incident on the light receiver R _1. , Does not enter the light receiver R ₂ . On the other hand, when the object is located further away from the projector P, the reflected light is incident on both the light receivers R ₁ and R ₂ , but the incident reflected light is at a distance of 4 from the projector P.
Since it is 1 / multiplier, there is almost no influence of direct reflection. From the above, it can be said that it is preferable to make the distance between the light projector P and the light receiver as large as possible.

The opening / closing surface 6 of the other automatic door 6a
0a is provided with a plane mirror 4 for reflecting the light projected from the projector 1, and a convex mirror 5 for expanding the reflected light reflected by the plane mirror 4 in the left-right direction and guiding it to the light receiver 2. There is. The plane mirror 4 and the convex mirror 5
FIG. 4A shows the action of the light by the direction A in FIG. 1, and FIG. 4B shows the action in the direction B in FIG. In either direction, the light projected from the projector 1 is reflected by the reflection mirror 4 at a projection angle of margin angles θ _P1 (vertical direction) and θ _P2 (horizontal direction) with respect to the reflection mirror 4, The light is reflected by the convex mirror 5 having the mirror angles of the angles θ _R1 (vertical direction) and θ _R2 (horizontal direction) and is incident on the light receiver 2. As described above, the configuration of the convex mirror 5 allows the reflected light to have a spread, and the installation angle is not required to be high, and the installation is easy.

In the above construction, the convex mirror 5 is used as one of the reflecting means, but the present invention is not limited to this.
As shown in FIG. 2, the concave lens 8 may be provided at the position on the light reflection side of the reflection mirror 7, or, although not shown, for example, instead of the plane mirror 4 shown in FIG. A concave lens may be provided at the position on the front side or the position on the rear side of light reflection, and various structures are possible without departing from the scope of the claims.

[0015]

Embodiments Both the first and second reflecting means are reflection mirrors (30 mm square mirror), and the opening interval of the door is 1.8.
If m, the mirror margin angle is plus or minus 0.4
~ 0.5 degrees. On the other hand, in this embodiment, the first reflecting means is a reflecting mirror installed at an angle of 45 °, the second reflecting means is installed at an angle of 45 °, and a concave lens having a focal length of 1340 mm is arranged at the subsequent stage. When the structure is adopted, the mirror allowance angle is expanded by 1 degree. As a result, it is not necessary to adjust the angle of the mirror attached to the frame of the door.

[0016]

As described above, according to the obstacle detecting device for an automatic door of the present invention, the first reflecting means and the second reflecting means are provided.
Since at least one of the reflecting means of the above is configured by a convex mirror or a concave lens is provided at the front stage or the rear stage of the at least one reflecting means, the angle after the reflection of light is increased by the margin angle. can do. Therefore, it is possible to detect the presence of an obstacle in the detection area with a simple structure without being affected by a swing during the traveling of the door and without requiring a high accuracy in the installation angle of the reflecting means.

[Brief description of drawings]

FIG. 1 is a diagram showing an overall configuration of an embodiment of the present invention.

FIG. 2 is a perspective view of an essential part showing a configuration example of a reflecting means in the embodiment of the present invention.

FIG. 3 is another one of the reflecting means in the embodiment of the present invention.
Perspective view of the main part showing one configuration example

FIG. 4 is an operation explanatory view of the embodiment of the present invention.

FIG. 5 is a diagram for explaining the influence of reflected light and the distance between the light emitter and the light receiver.

[Explanation of symbols]

1 Floodlight 2 ... Receiver 4 First reflection means 5 ... Second reflection means 6a, 6b ... Automatic door

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Claims (2)

(57) [Claims] 1. A light projector and a light receiver arranged at a predetermined interval on one door opening / closing surface of an automatic door, and a first light reflecting member arranged on the other opening / closing surface for reflecting light projected from the light projector. A detecting device comprising: a reflecting means; and a second reflecting means for guiding the reflected light to the photodetector, the first reflecting means and the second reflecting means being provided.
At least one of the reflecting means of the
Obstacle detection device for automatic doors characterized by being made
Place 2. An automatic door at a predetermined interval on one of the door opening / closing surfaces.
Placed on the other opening and closing surface with the arranged sender and receiver
For reflecting the light emitted from the projector.
First reflecting means and reflecting the reflected light
Second reflection means for guiding the light to the light receiver.
In the detection device, the first reflecting means and the second
Reflection of light from at least one of the reflection means
A concave lens is provided on the front side or the back side of the reflection.
Obstacle detection device for automatic doors characterized by a configuration
Place