JPH08136654A - Sensor for door - Google Patents

Abstract

PURPOSE: To constitute the two detecting areas of a sensor for door so that one area can be fixed and the other area can be moved and, at the same time, to reduce the thickness of a door sensor. CONSTITUTION: A light beam projected from a protector 6 is directly projected upon a floor and a safe area S1 is set at a position along a door 4. The partial optical path of the light beam from the projector 6 is changed by oscillating a reflecting mirror 10 by means of an oscillating section 14. While the safe area S1 is fixed, the detecting area of a sensor for door is moved from an area S2 to another area S5 through areas S3 and S4 in front of the door 4. Reflected light rays from the area S1 are directly received by means of a photoreceptor 8 and reflected light rays from one of the areas S2-S5 are received by means of the photoreceptor 8 after the light rays are reflected by a reflecting mirror 12 which is oscillated together with the mirror 10 by means of the oscillating section 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sensor for detecting a passing body passing through an automatic door to open and close the door.

[0002]

2. Description of the Related Art An example of a conventional door sensor is disclosed in, for example, Japanese Patent Application Laid-Open No. 3-55381. In this door sensor, the reflecting mirror that reflects the light projected from the projector provided above the door is used as a two-sided mirror, and the projected light is divided into two light beams, and the light is projected onto the floor surface. By setting a first area near the door and a second area away from the door and adjusting the rotation angle of the reflecting mirror, the positions of the first area and the second area are moved simultaneously. is there. Needless to say, even in the light receiver that receives the reflected light from the first area and the second area,
A reflecting mirror of a face mirror is provided, and the light reflected from the first and second areas is received by the light receiver by adjusting the rotation angle of the reflecting mirror.

Another example of a conventional door sensor is disclosed in Japanese Utility Model Publication No. 3-42230. In this door sensor, a presence sensor provided with a projector and a light receiver is provided so as to detect whether or not a passer-by is present in a first area set near the door, and a first area. A proximity sensor provided with a light projector and a light receiver is provided so as to detect whether or not a passing body has passed through a second area farther from the door than the first area. In order to set the second area, the presence sensor is provided on the door side along a direction substantially vertical to the door, and the proximity sensor is provided farther from the door side than the presence sensor.

[0004]

However, Japanese Unexamined Patent Publication (Kokai) No. 3-5.
In the technique of Japanese Patent No. 5381, when the reflecting mirror is rotated,
Since the two areas move at the same time, for example, it was not possible to fix the position of the first area and change only the position of the second area. Generally, the first area is provided to prevent a human body from being caught in the door when there is a passing body in the vicinity of the door. Therefore, it is desirable that the position is fixed. It is not preferable to move the position of the first area when the position of the area is set to a desired position.

According to the technique disclosed in Japanese Utility Model Publication No. 3-42230, by fixing the presence sensor and changing the attachment state of the proximity sensor, the position of the first area is fixed and the second area is fixed. It is easy to set the position of to the desired position. However, this requires two sensors, a presence sensor and a proximity sensor, and since these are arranged in a direction perpendicular to the door, the thickness of the door sensor becomes thicker and larger. Become. Generally, it is aesthetically preferable that the door sensor has a thin thickness, and if a shutter is installed in front of the door, if the door sensor is thick, the shutter will not close. The sensor is preferably thin.

[0006] The present invention provides a sensor for a door, which can move at least one area independently of other areas in a plurality of areas including at least two areas and can be made thin. The purpose is to do.

[0007]

In order to achieve the above-mentioned object, the first invention comprises a projector for emitting a projected light beam and a light receiver operated by a reflected light beam of the projected light beam of the projector. , The first light beam is projected onto the first region at a position along the door, and at least the second light beam is projected onto the second region at a position distant from the first light beam in the front direction of the door. A door sensor configured to project light, wherein the light receiver operates when at least one of the reflected light beams of the first and second light beams is received, in which the light projector emits a light beam from the light projector. To a plurality of light beams including the first and second projected light beams, and each of the divided projected light beams in the front-rear direction of the door independently of other divided projected light beams. And a moving means for moving to.

The second invention, like the first invention, comprises a light projector and a light receiver, and the light receiver comprises a dividing means and a moving means, as in the first invention. It is a thing.

A third aspect of the present invention includes a light projector and a light receiver similar to those of the first invention, and both the light projector and the light receiver include a dividing means and a moving means. The moving means of the light projector and the light receiver can be adjusted simultaneously or separately.

A fourth aspect of the present invention is a door sensor which is arranged at a position along a door and which includes a pyroelectric element that operates by receiving a heat ray emitted by a passing body approaching the door. Similar to the second aspect of the invention, it is provided with a dividing means and a moving means.

A fifth aspect of the present invention is any one of the door sensors of the above-described first to fourth aspects, in which the first region is fixed and the second region is moved.

In a sixth aspect of the present invention, in any of the door sensors of the first to fifth aspects, the dividing means is a reflecting portion for reflecting a light beam from a light projector or a divided light receiving area, and the moving means is the reflecting means. This is a swinging unit that swings the unit.

In a seventh invention of the present invention, in any one of the door sensors of the first to sixth inventions, the dividing means has a plurality of reflecting portions for reflecting the light rays from the light projector or the divided light receiving area. At least one of the reflecting portions is moved by the moving means.

In the eighth aspect of the present invention, in the door sensor of the seventh aspect of the invention, the optical axis is set so that the amount of light to each reflecting portion is equal.

[0015]

According to the first aspect of the present invention, the light beam projected from the light projector is split into a plurality of light beams including the first and second projected light beams by the splitting means. The moving means moves each of the divided projected light rays in the front-rear direction of the door independently of the other divided projected light rays. Therefore, for example, the first
The detection area set by the projected light beam can be fixed, and the detection area set by the second projected light beam can be moved. On the contrary, the detection area set by the second projected light beam can be fixed, and the detection area set by the first projected light beam can be moved.

According to the second aspect of the present invention, the light projector projects the first light beam on the first region along the door, and the second light beam is emitted on the second region away from the first light beam in the front direction of the door. At least two light rays are projected, and the light receiver is activated when at least one of the reflected light rays of the first and second light rays is received. In the light receiver, the splitting means reflects the reflection of the first and second light rays. An area for receiving the reflected light ray including the light ray is a first area at a position along the door, and a second area at a position further away from this position in the front direction of the door.
Is divided into a plurality of divided light-receiving areas including the area. The moving means moves the divided areas independently of other divided light receiving areas. Therefore, for example, the first region can be fixed and the second region can be moved, or conversely, the second region can be fixed and the first region can be moved.

According to the third aspect of the invention, both the light transmitter and the light receiver are provided with the dividing means and the moving means. When the moving means of the light projector and the light receiver are moved at the same time, at least the first and second means are provided. It is possible to make the two areas where the projected light rays are projected coincide with the at least two areas where the reflected light rays are received by the light receiver. Further, when the moving means of the light projector and the light receiver are moved separately, at least two areas where the first and second projected light rays are projected and at least two areas where the reflected light rays are received by the light receiver are provided. Can be different regions, and, for example, when the first region from the projector and the first region to the light receiver are intersected in the air, the intersection region can be the detection region.

According to the fourth aspect of the invention, in the light receiver, the dividing means defines the heat ray receiving region emitted by the passing body as the first portion along the door.
Is divided into a plurality of divided light receiving areas including a second area and a second area further away from this position in the front direction of the door. The moving means moves the divided areas independently of other divided light receiving areas. Therefore, for example, the first region can be fixed and the second region can be moved, or conversely, the second region can be fixed and the first region can be moved.

According to the fifth aspect of the invention, since the first area close to the door is fixed, this is used as an area for preventing a passing body existing near the door from being caught in the door. Since the second area is moved to an arbitrary position, it can be set to an arbitrary position as an area for detecting the approaching of a passing object.

According to the sixth aspect of the invention, since the dividing means is the reflecting portion for reflecting the light beam and the moving means is the swinging portion for swinging the reflecting portion, the swinging portion swings the reflecting portion. Then, either the first area or the second area moves.

According to the seventh invention, since the dividing means is composed of a plurality of reflecting portions, it is possible to set two or more regions, and at least one of the reflecting portions is moved by the moving means. Therefore, for example, two areas can be fixed and one area can be moved.

According to the eighth aspect of the invention, the optical axes are set so that the light amounts to the plurality of reflecting portions are equalized, so that the sensitivities in the plurality of regions can be made equal.

[0023]

EXAMPLE A first example of FIGS. 1 to 3 will be described. The door sensor 2 of the first embodiment is provided above the door 4 of the automatic door, as shown in FIGS. This door 4 includes two door bodies 4a and 4a, as shown by phantom lines in FIG.
b, these door bodies 4a, 4b are arranged in a state in which the passage opening of the passing body is closed, and when the door sensor 2 detects a passing body such as a human body, it moves in the direction of the arrow. Then, the passage opening is opened, and after a predetermined time, each door body 4a moves in the direction opposite to the arrow to close the passage opening. The door sensor 2 is provided above the boundary between the doors 4a and 4b.
Is provided.

As shown in FIG. 3 (a), the door sensor 2 approaches the door 4 and extends along the surfaces of the door bodies 4a and 4b of the door 4 into a first area, for example, on the floor. Set the safety area S1. In this safety area S1, when there is a passing body in the safety area S1, the door 4 is opened, and a passing body approaching the door 4 or a passing body stopped on the traveling path of the door is sandwiched by the door. It is provided to prevent this.

As shown in FIG. 3A, the safety area S1
It is also possible to set only the door body 4 of the door 4 on the floor surface further away from the door 4 than the safety area S1.
A second area, for example, the detection area S2 can be set along the opening and closing directions of a and 4b. This detection area S
2 detects a passing body moving toward the door 4,
It is for opening the door 4.

The detection area S2 can be set in contact with the safety area S1 as shown in FIG. 3 (b), or as shown in FIGS. 3 (c) to (e).
1, detection areas S3, S4,
It can also be set to S5. That is, although the position of the safety area S1 is fixed near the door 4,
The position of the detection area can be moved to any position in the direction away from the door 4 than the safety area S1.
In this way, the position of the detection area is changed depending on the layout and conditions of the building where the automatic door is installed, such as when the passage in front of the door is narrow or when the front of the door is wide, such as the entrance to a building. This is to set a detection area corresponding to each site even in such a case. Although the two areas of the safety area S1 and the detection area are set, only the door sensor 2 is used.

In order to set the safety area S1 and the detection area as described above, the door sensor 2 is, as shown in FIG. 1, a floodlight 6 which is composed of, for example, an infrared light emitting diode, and a photodiode or And a light receiver 8 composed of a phototransistor.

As shown in FIGS. 2 (a) to 2 (e), the projector 6 has its optical axis 6a opposite to the door surfaces of the door bodies 4a and 4b, that is, the side where the safety area S1 or the like is set from the vertical surface. It is placed with a slight inclination to the side. Similarly, the light receiver 8 has its optical axis inclined.

Substantially directly below the light projector 6 and the light receiver 8, flat reflecting mirrors 10 and 12 are provided as dividing means, for example, as reflecting portions. These reflecting mirrors 10 and 12 are arranged such that the reflecting surfaces thereof face the door surface side of the door 4, and the lower end portions of the reflecting mirrors 10 and 12 are moving means, for example, the swinging portion 1.
4 attached. As shown in FIG. 1, the swinging portion 14 is arranged in parallel along the opening / closing direction of the door 4 and is rotatably supported around its longitudinal direction by a bearing (not shown).

Further, both reflecting mirrors 10 and 12 are supported by a support 16 extending from the swinging portion 14.
The two reflecting mirrors 10 and 12 are attached to the swinging portion 14 so that the angle formed by them is zero, that is, the two reflecting mirrors are located on the same plane. Therefore, the two reflecting mirrors 10 and 12 are
The angle with respect to the vertical plane is always the same.

A lever 18 for swinging the swinging portion 14 is provided at one end of the swinging portion 14. By operating this lever 18, the reflecting mirrors 10 and 12
Are changed so that they are at the same angle with respect to the vertical plane at the same time. The rocking portion 14 can be rotated at an arbitrary angle and provided with a locking tool so as to stop the rotation at that angle, or at a selected angle out of several predetermined angles. A lock can also be provided to stop the rotation.

Below the swinging portion 14, a light projecting lens 20 for projecting the light beam projected from the projector 6 and the light beam reflected by the reflecting mirror 10 to the floor side is provided. . Similarly, a light receiving lens 22 for receiving the light beam reflected from the floor surface directly or by further reflecting it by the reflecting mirror 12 to the light receiver 8 is provided.

These light projecting lens 20 and light receiving lens 22
Is a single-convex lens, and the projection lens 20 is
The central axis 20a is located on the surface along the front-rear direction of the door 4 including the optical axis 6a of the projector 6 as shown in FIG.
As shown in FIG. 2A, the central axis 20a is arranged so as to be located on the vertical plane. Light receiving lens 22
Similarly, as shown in FIG. 1, the central axis 20a is also located on the surface along the front-rear direction of the door 4 including the optical axis 20a of the light receiver 20, and the central axis 20a is located on the vertical plane. Are arranged as follows.

From the setting of only the safety area S1 as shown in FIGS. 3A to 3E, the setting of the safety area S1 and the detection area S2, the setting of the safety area S1 and the detection area S3, and the setting of the safety area S1. The setting of the detection area S4 and the setting of the safety area S1 and the detection area S5 are performed by operating the lever 18 of the swinging portion 14 and changing the angle formed by the reflecting mirrors 10 and 12 with respect to the vertical plane. Be seen.

In FIG. 1, the safety area S1 formed by the light projector 6 and the safety area S1 formed by the light receiver 8 are drawn separately, but this is due to the limitation of the size of the drawing. 6. There is a considerable height from the light receiver 8 to the floor surface, and the angle range of the light projected from the light projector 6 and the angle range of the light received by the light receiver 8 are large as illustrated. Therefore, in terms of geometrical optics, it can be considered that the safety area S1 by the light projector 6 and the safety area S1 by the light receiver 8 are set at the same location. The same applies to the other detection areas S2, S3, S4 and S5.

The setting of each area will be described with reference to FIGS. 2 (a) to 2 (e). The light projector 6 projects infrared light around the optical axis 6a at a predetermined irradiation angle. As shown in FIG. 2A, the reflecting mirrors 10, 12
When the angle is 1 in the vertical plane, the outermost light rays of the light rays projected from the projector 6 go straight by grabbing the upper end of the reflecting mirror 10 and projecting onto the floor surface via the light projecting lens 20. Be illuminated. This defines the outer edge p1 of the safety area S1.

In reality, the light projector 10 does not uniformly project light at the above-mentioned angle, and to some extent also includes light rays parallel to the vertical plane, so that the outer edge portion p2 of the safety area S1 is defined. . In addition, the angle at which the projector 6 projects the light is as shown in FIG.
If the width is wide as indicated by the reference sign p11 in FIG.
The outer edge p1 is defined by the rays indicated by 1, and the reference sign p1
The outer edge part p2 is demarcated by the light ray shown by.

In this way, if the safety area S1 is defined, and the light reflected from it is not blocked by a passing body such as a human body, the light receiving lens 2 is formed in the same manner as in FIG.
The light is directly received by the light receiver 8 via 2. That is, the ray p
1 and p2 go straight through the light receiving lens 22 and are received by the light receiver 8.

As shown in FIG. 2B, the reflecting mirrors 10, 1
Angle 2 where 2 forms a certain angle in the clockwise direction with respect to the vertical plane
In the case of, the outer edge portion p1 of the safety area S1 is defined by the light beam p1 from the light projector 6 in the same manner as in the case of FIG. Further, an outer edge portion p2 of the safety area s1 is defined by a light ray p2 that travels straight from the light projector 6 in parallel with the vertical plane and goes straight while grazing the lower end of the reflecting mirror 10.

Further, the light is projected from the light projector 6 and is reflected by the reflecting mirror 10.
The outer edge p3 of the detection area s1 is defined by the light ray p3 reflected at the upper end of the. Similarly, an outer edge portion p4 of the detection area S2 is defined by a light ray p4 emitted from the light projector 6 and reflected by the lower end of the reflecting mirror 10. The ray p
4 and the ray p1 intersect in the vicinity of the floor surface as is clear from FIG. 2B, the safety area S1 as shown in FIG.
The outer edge portion p1 and the outer edge portion p4 of the detection area S2 intersect. In this way, the detection area S2 is set in addition to the safety area S1. The light rays reflected from the safety area S1 and the detection area S2 are received by the light receiver 8 by following the course opposite to that of FIG. 2B by replacing the light projector 6 with the light receiver 8 in FIG. 2B. To be done. Since the same applies to the following angles 3, 4, and 5, the description of the light reception is omitted below.

As shown in FIG. 2C, the reflecting mirrors 10 and 12
However, when the angle 3 is larger than the angle 2 with respect to the vertical plane, the safety area S1 is the same as the case of the angle 2.
Outer edges p1 and p2 are defined. That is, the safety area S
Position 1 does not move. This is the same for the angles 4 and 5 described later.

Further, the light is projected from the projector 6 and is reflected by the reflecting mirror 10.
Ray p3 reflected near the upper end of the projection lens 20
Is projected onto the floor surface through the outer edge p3 of the detection area S3.
To define At this time, the light ray p31 reflected by the upper end portion of the reflecting mirror 10 is a light ray p31 as is clear from FIG.
Light is projected onto the floor at a position closer to the door 4 than 3. That is, the inside of the outer edge portion p3 of the detection area S3 is defined. Also,
The light is projected from the projector 6 and reflected at the lower end of the reflecting mirror 10,
The outer edge p4 of the detection area S3 is defined by the light beam p4 projected onto the floor surface through the light projecting lens 20.

Light rays p3 and p4 shown in FIGS. 2B and 2C.
Since the angle formed by the vertical plane is larger in the case of FIG. 2C, the detection area S3 is closer to the door 4 than the detection area S2 as shown in FIGS. 3B and 3C. It is set in a distant position.

As shown in FIG. 2D, the reflecting mirrors 10 and 12
However, when the angle 4 is larger than the angle 3 with respect to the vertical plane, the outer edges p1 and p2 of the safety area S1 are defined similarly to the cases of the angles 2 and 3.

Further, the light is projected from the projector 6 and is reflected by the reflecting mirror 10.
Ray p3 reflected near the upper end of the projection lens 20
The light is projected onto the floor surface through the outermost peripheral portion of, and defines the outer edge portion p3 of the detection area S3. At this time, the light beam p32 reflected at the upper end of the reflecting mirror 10 is reflected to the outside of the light projecting lens 20 as apparent from FIG. 3D, and is absorbed by the main body case of the door sensor or the like. , Does not contribute to the definition of the detection area S4. The outer edge p4 of the detection area S3 is defined by the light beam p4 projected from the projector 6 and reflected by the lower end of the reflecting mirror 10 and projected onto the floor surface through the projection lens 20.

Light rays p3 and p4 shown in FIGS. 2 (c) and 2 (d).
Since the angle formed by the vertical plane is larger in the case of FIG. 2 (d), the detection area S4 is closer to the door 4 than the detection area S3 as shown in FIGS. 3 (b) and 3 (c). It is set in a distant position.

As shown in FIG. 2E, the reflecting mirrors 10 and 12 are
However, when the angle 5 is larger than the angle 4 with respect to the vertical plane, the outer edges p1 and p2 of the safety area S1 are defined similarly to the cases of the angles 2, 3, and 4.

Further, the light is projected from the projector 6 and is reflected by the reflecting mirror 10.
Ray p3 reflected near the upper end of the projection lens 20
Is projected onto the floor surface through the outer edge p3 of the detection area S3.
To define At this time, since the light ray p33 reflected by the upper end portion of the reflecting mirror 10 is reflected to the outside of the light projecting lens 20 as apparent from FIG. 3 (e), it is absorbed by the main body case of the door sensor or the like. Therefore, it does not contribute to the definition of the detection area S5. Further, the definition of the outer edge portion p4 of the detection area S5 is performed similarly to the case of the angles 2, 3, and 4.

Rays p3 and p4 shown in FIGS. 2D and 2E.
Since the angle formed by the vertical plane is larger in the case of FIG. 2 (e), the detection area S5 is closer to the door 4 than the detection area S4 as shown in FIGS. 3 (d) and 3 (e). It is set in a distant position.

Therefore, by swinging the lever 18 of the swing portion 14, the position of the detection area is set to an arbitrary position such as S2, S3, S4 and S5 while the safety area S1 is fixed. be able to.

In this embodiment, the optical axes of the light projector 6 and the light receiver 8 are tilted from the vertical plane, but this is involved in fixing the safety area S1 and moving the detection area as described above. Therefore, even if the optical axes of the light projector 6 and the light receiver 8 are aligned with the vertical plane, the safety area S1 can be similarly fixed and the detection area can be moved.

The optical axes of the light projector 6 and the light receiver 8 are inclined for the following reason. Generally, the intensity of the light beam projected from the projector 8 is the highest near the optical axis 6a, and becomes smaller toward the periphery. Further, when the distance between the light projector 6 and the light receiver 8 changes, even if light is projected with the same intensity, the amount of received light becomes smaller as the distance between them becomes larger.

In this embodiment, the light reflected by the detection area and received by the light receiver 8 has a longer optical path than the light reflected by the safety area S1 and received by the light receiver 8. Further, as is clear from the above description, the light not reflected by the reflecting mirror 10 is projected onto the safety area S1,
The light reflected by the reflecting mirror is projected onto the detection area. Therefore, the intensity of the light beam heading for the detection area where the optical path becomes long is increased, and even if the light beam is received through the long optical path, the received light amount is the same as the light beam from the safety area S1 that is received through the short optical path. The optical axis 6a is tilted so as to face the reflecting mirror 10 side. Since the optical axis of the projector 6 is tilted in this manner, the optical axis of the light receiver 8 is also tilted. In this embodiment, when the angle is 4, the inclination is adjusted so that the safety area S1 and the detection area S4 have the same sensitivity.

The second embodiment is shown in FIGS. As shown in FIGS. 6 (a) to 6 (e), the door sensor 2a of this embodiment sets the safety area S1 close to the door surface and the detection area S2 adjacent thereto in a fixed manner. Further, another movable detection area is set, as indicated by symbols S3, S4 and S5. Since a plurality of detection areas are set in this way, it is possible to make a wide area for detecting a passing object moving toward the door and a detection area without any omission.

Therefore, in the second embodiment, as shown in FIG. 4, as in the first embodiment, the light projector 6, the light receiver 8, the reflecting mirrors 10 and 12, the oscillating portion 14, and the light projecting lens 20. In addition to the light receiving lens 22, splitting means, for example, flat reflecting mirrors 24 and 26 as reflecting portions are separately fixed and provided. That is, in this embodiment, a plurality of dividing means are provided, and one of the reflecting mirrors 10, 12 is configured to be swung by the swinging portion 14.

As shown in FIGS. 5 (a) to 5 (e), the reflecting mirror 24 is vertically arranged on the side opposite to the side on which the safety area S1 and the like are set so as to be almost in contact with the projector 6 having the optical axis 6a tilted. It is located in.

Next, as shown in FIGS. 6A to 6E, the safety area S1 and the detection area S2 are fixedly set, and another detection area can be moved to S3, S4 and S5. , Which will be described with reference to FIG. 5, the safety area S1 and the light rays for setting the outer edge portions of the two detection areas as shown in FIG. Light ray S1c forming the center of the safety area S1, detection area S2
Ray S2c forming the center of the detection area, detection areas S3, S4, S5
Only the rays S3c, S4c, and S5c that respectively form the centers of are shown and described.

When the reflecting mirrors 10 and 12 are positioned at an angle of 1 in the vertical plane, the light ray S1c in the safety area S1 is reflected by the reflecting mirror 1.
It goes straight in the vicinity of the upper end portion of 0 and is projected onto the floor surface via the projection lens 20 to define the safety area S1. The light ray corresponding to the light ray S1c among the reflected light rays from the safety area S1 is directed to the light receiving lens 22, passes near the upper end of the reflecting mirror 12, and is received by the light receiver 8.

At this time, since the light rays demarcating the detection area S2 and the like are present on the right side of the reflecting mirror 10 in FIG. 5A, even if they are reflected by the fixed reflecting mirror 24, the reflecting mirror 10 is further reflected. Which is reflected by the back surface of the (the right side surface in FIG. 5A) or is not reflected by the fixed reflecting mirror,
Since it goes straight on and is absorbed by the main body case of the door sensor 2a and the like, it does not participate in defining the detection area. Therefore, only the safety area S1 is set as shown in FIG.

When the reflecting mirror 10 is rotated at an angle of 2 more clockwise than when the angle is 1, the light beam S1C goes straight and is projected onto the floor surface through the light projecting lens 20. As a result, the safety area S1 is defined similarly to the case where the angle is 1. Further, the light ray S2c is reflected by the fixed reflecting mirror 24,
The light is projected onto the floor through the light projecting lens 20. Further, the light ray S3c is reflected near the upper end of the reflecting mirror 10 and projected onto the floor surface via the light projecting lens 20. This ray S3c is very close to the ray S2c and is almost parallel. Therefore, the detection area S2 is defined by the two light rays S2c and S3c as shown in FIG. 6B. Moreover, the angle formed by the rays S2c and S3c with respect to the vertical plane is the ray S
Since 1C is larger than the angle formed with the vertical plane, the detection area S2 is defined at a position farther from the door 4 than the safety area S1.

Of the light rays reflected from the safety area S1 and the detection area S2, the light ray corresponding to S1c goes straight through the light receiving lens 22 as described above, and the light ray corresponding to the light ray S2c is at the upper end of the reflecting mirror 12. Reflected by the ray S3
The light ray corresponding to c is reflected by the reflecting mirror 26 and received by the light receiver 8. Since the same applies to the following angles 3 to 5, the description of the case of receiving light will be omitted.

When the reflecting mirror 10 is rotated in the clockwise direction rather than the angle 2, the safety area S1 and the detection area S2 are defined by the light rays S1c and S2c in the same manner as in the case of the angle 2. Since both of these rays S1c and S2c are not reflected by the swinging reflecting mirror 10, their positions are the same as in the case of the angle 2. This is the angle 4,5
The same is true for.

The light ray S3c is reflected slightly below the upper end of the reflecting mirror 10 and projected onto the floor surface through the light projecting lens 20. The angle formed by this ray S3c with the vertical plane is the ray S2.
Since C is larger than the angle formed with the vertical plane, the detection area S3 is defined at a position farther from the door 4 than the detection area S2 as shown in FIG. 6C.

When the reflecting mirror 10 is rotated at an angle of 4 more clockwise than the angle 3, the safety area S1 and the detection area S2 are defined in the same manner as the case of the angle 3. Ray S4c
Is below the upper end of the reflecting mirror 10 (the light ray S3 in FIG. 5C).
The light is reflected at a position lower than the reflection position of c) and is projected onto the floor through the light projecting lens 20. This ray S4c
Since the angle formed with the vertical plane is larger than the angle formed by the light ray S3C with the vertical plane, as shown in FIG.
A detection area S4 is defined at a position farther from the door 4 than 3.

In the case where the reflecting mirror 10 is rotated at an angle of 5 more clockwise than the angle 4, the safety area S1 and the detection area S2 are defined in the same manner as in the case of the angle 4. Ray S5c
Is reflected at approximately the center of the reflecting mirror 10 (below the reflection position of the light ray S4c in FIG. 5D), and the projection lens 2
It is projected on the floor through 0. Since the angle formed by the light ray S5c with the vertical plane is larger than the angle formed by the light ray S4C with the vertical plane, the detection area S5 is located farther from the door 4 than the detection area S3 as shown in FIG. 6 (e). Defined.

Also in this embodiment, the optical axes of the projector 6 and the light receiver 8 are inclined toward the fixed reflecting mirrors 24, 26 side from the vertical plane, which is the reason for the first embodiment. Is the same as. Therefore, if the light receiving sensitivity may differ depending on the area, the optical axes of the light projector 6 and the light receiver 8 may be positioned on the vertical plane.

FIG. 7 shows a third embodiment. In the first embodiment, the reflecting mirrors 10 and 12 are attached to one swinging portion 14,
Both sides are always installed at the same angle to the vertical plane,
While both reflecting mirrors are configured to form the same angle with respect to the vertical plane at the same time, the door sensor 2b of this embodiment is used.
Is provided with a swinging portion 14a for the reflecting mirror 10 and a swinging portion 14b for the reflecting mirror 12, respectively.
The a and 14b are made to swing independently of each other.

With this structure, since the safety area S1 is not formed by the light rays reflected by the reflecting mirrors 10 and 12, it is formed on the floor surface close to the door 4 as in the first embodiment. can do. When the angle θ formed by the reflecting mirror 10 with respect to the vertical plane and the angle φ formed by the reflecting mirror 12 with the vertical plane are different, the light is emitted from the projector 8 and reflected by the reflecting mirror 10 as shown in FIG. The light path of the light beam that is projected through the light projecting lens 20 and the light receiving lens 2
Since the optical paths of the light rays reflected by the reflecting mirror 12 via 2 and received by the light receiver 8 intersect in the air, the detection area S6 in the air is farther from the door 4 than the safety area S1.
Can be set.

In each of the above embodiments, the light projector 6 and the light receiver 8 are provided, and the human body or the like is detected depending on whether or not the infrared light projected from the light projector 6 is blocked. However, the human body or the like is generated. A human body or the like can be detected by using a pyroelectric element that detects infrared rays. In this case, in the first embodiment, the light projector 6, the reflecting mirror 10 and the light projecting lens 20 are removed, and in the second embodiment, the reflecting mirror 24 is removed in addition to this, and the light receiving device 8 is replaced by a focusing lens. An electric element may be used.

In the second embodiment described above, the reflecting mirrors 24, 2
Although 6 is fixed, these reflecting mirrors 24 and 26 may be swung similarly to the reflecting mirrors 10 and 12. In addition, in the second embodiment, the reflecting mirror 10 and
24 and two reflecting mirrors for the light receiver 8
Although 26 and two reflecting mirrors are provided respectively, three or more reflecting mirrors may be provided for the projector 6 and three or more reflecting mirrors may be provided for the light receiver 8. In that case, all of the three or more reflecting mirrors may be swingable, or only at least one may be swingable. Also, in the above example,
Although the oscillating portions 14, 14a, 14b are provided at the lower ends of the reflecting mirrors 10, 12, they may be provided at the upper ends or in the middle.

In each of the above-mentioned embodiments, one light projector 6 and one light receiver 8 are provided for simplification of description, but the safety area and the detection area are arranged in the opening / closing direction of the door 4. If you want to set a long time, Emitter 6 and Receiver 8
It is sufficient to increase the number of each.

[0072]

As described above, according to the present invention as set forth in claim 1, 2 or 4, it is possible to set a plurality of detection areas despite using one door sensor. Moreover, since at least one of them can be moved independently of other detection areas, the thickness of the door sensor can be reduced, and the detection area can be considered without considering the relationship with other detection areas. It can be set at a desired position.

According to the invention described in claim 3, when the moving means for the light projector and the moving means for the light receiver are moved at the same time, the same effect as that of the invention described in claim 1, 2 or 4 can be obtained. When the moving means for the light receiver and the moving means for the light receiver are moved separately, one detection region can be set at a position where the optical paths of the light projector and the light receiver intersect, for example, in the air.

According to the fifth aspect of the present invention, the first area set in front of the door is fixed, and the second area further away from the door 2 than the first area can be moved. ,
The first area can prevent the passing body from being caught in the door, and the second area can be placed at a position corresponding to the opening / closing speed of the door.
The area can be set.

According to the invention described in claim 6, since the dividing means is constituted by the reflecting portion and the moving means is constituted by the oscillating portion for oscillating the reflecting portion, the structure is simple and the manufacturing is easy. Is.

According to the invention described in claim 7, since a plurality of dividing means are provided, it is possible to set a larger number of detection areas than in the inventions according to claims 1 to 6, and detection without omission is possible. An area can be set to reliably detect a passing object approaching the door.

According to the eighth aspect of the present invention, since the light receiving sensitivities of the light receiving devices can be made equal, there is no variation in the detection accuracy of each detection region, and more safety can be secured.

[Brief description of drawings]

FIG. 1 is a front view of a first embodiment of a door sensor according to the present invention.

FIG. 2 is an operation explanatory diagram of a main part of the first embodiment.

FIG. 3 is an explanatory diagram showing a schematic relationship between a detection area and a safety area according to the first embodiment.

FIG. 4 is a front view of the second embodiment.

FIG. 5 is an explanatory view of the operation of the essential parts of the twenty-fifth embodiment.

FIG. 6 is an explanatory diagram showing a schematic relationship between a detection area and a safety area according to the second embodiment.

FIG. 7 is a schematic perspective view of the third embodiment.

[Explanation of symbols]

 2 2a 2b Door sensor 4 Door 6 Emitter 8 Light receiver 10 12 Reflecting mirror (dividing means) 14 14a 14b Oscillating part (moving means) S1 Safety area (first area) S2 to S6 Detection area (second area) )

Claims (8)

[Claims] 1. A light projector that emits a projected light beam, and a light receiver that operates by a reflected light beam of the projected light beam of the light projector, wherein the projector is located in a first region at a position along a door.
The light beam is projected, and at least the second light beam is projected onto the second region at a position distant from the first light beam in the front direction of the door, and the light receiver includes the first and second light beams. In the door sensor configured to be activated when at least one of the reflected light rays is received, the light projector divides the light projected from the light projector into a plurality of light rays including first and second light projected rays. A door sensor, comprising: a dividing means for moving the divided projected light beam and a moving means for moving the divided projected light beam in the front-rear direction of the door independently of other divided projected light beams. 2. A light projector that emits a projected light beam, and a light receiver that operates by a reflected light beam of the projected light beam of the light projector, wherein the projector is provided in a first region at a position along a door.
The light beam is projected, and at least the second light beam is projected onto the second region at a position distant from the first light beam in the front direction of the door, and the light receiver is configured to detect the first light beam and the second light beam. In the door sensor configured to operate when at least one of the reflected light rays is received, the light receiver includes a first area at a position along the door for receiving a reflected light ray of the projected light ray of the light projector. Dividing means for dividing into a plurality of divided light receiving regions including a region and a second region at a position further away from this position in the front direction of the door, and the divided region, the other divided light receiving region. A door sensor, characterized in that the door sensor is provided with a moving means for moving independently. 3. A light projector that emits a projected light beam, and a light receiver that operates by a reflected light beam of the projected light beam of the light projector, the first projector being located in a first region at a position along a door.
The light beam is projected, and at least the second light beam is projected onto the second region at a position distant from the first light beam in the front direction of the door, and the light receiver is configured to detect the first light beam and the second light beam. In the door sensor configured to be activated when receiving any of the reflected light rays, the light projecting device divides the light projecting light beam from the light projecting device into a plurality of light beams, and each of the divided light projecting light beams. A moving means that moves the door in the front-rear direction regardless of the other divided projection light rays, wherein the light receiver has a region for receiving a reflected light ray of the light projection light of the light projector along the door. A first area at a different position and a second area at a position farther away from the door in the front direction of the door, and a dividing means for dividing the divided light receiving area into a plurality of divided light receiving areas. , Unrelated to other divided light receiving areas And a moving means for moving the door sensors, characterized in that the moving means of the projector and the light receiver, and at the same time or adjustable separately. 4. A door sensor, which is arranged at a position along a door and includes a pyroelectric element that operates by receiving a heat ray emitted by a passing body approaching the door, wherein a light receiving area of the heat ray is provided. Dividing means into a plurality of divided light receiving areas including a first light receiving area at a position along the door and a first light receiving area at a position further away from this position in the front direction of the door; A door sensor, comprising: a moving unit that moves a divided light receiving area independently of other divided light receiving areas. 5. The door sensor according to claim 1, 2, 3 or 4, wherein the first area is fixed and the second area is moved. 6. The door sensor according to claim 1, 2, 3, 4, or 5, wherein the dividing means is a reflecting portion that reflects a light beam from the projector or the divided light receiving region.
A door sensor, wherein the moving means is a swinging portion that swings the reflecting portion. 7. The door sensor according to claim 1, 2, 3, 4, 5 or 6, wherein the dividing means has a plurality of reflecting portions for reflecting light rays from the projector or the divided light receiving area. A door sensor, wherein at least one of the reflecting portions is moved by the moving means. 8. The door sensor according to claim 7,
A door sensor, wherein an optical axis is set so that the amount of light to each of the above-mentioned reflection parts becomes even.