JP2009229079A - Sensor for automatic door - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To set an area under monitoring in fine detail, according to the width of an opening section or the mounting height of a sensor using only with simple operations, or operations of a setting section. <P>SOLUTION: Light-emitting elements 14a to 14d emit lights in a cyclical manner, and lenses 16a to 16d deflect the emitted light, in a direction perpendicular to the opening width direction of a door. The emitted light is received by light-receiving elements 22a1 to 22a9 and 22b1 to 22b9 via multisplit lenses 24a, 24b. The setting section 44 sets whether each light-emitting element is allowed to emit light for each light-emitting element. A control section 30 determines whether a person or object is present or absent within the area under monitoring from the reception conditions of the light-receiving elements. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a sensor for an automatic door, and more particularly, to a sensor using a projector / receiver.

  Some automatic door sensors using light projectors and receivers monitor a monitoring area with a large number of spot lights while using a small number of light projectors and light receivers. For example, in the sensor disclosed in Patent Document 1, light from a projector is projected to different positions in a monitoring area using a multi-segment lens, and reflected light is received from these positions using another multi-segment lens. It is focused on the vessel. In Patent Document 2, two projectors are arranged side by side so that light from these projectors passes through the centers of the two lens parts of the multi-divided lens divided into two parts, and from the distance between the centers of the two lens parts. Two projectors are arranged at a large interval, and light is projected on both sides of a virtual center line passing through the center between the two projectors. The monitoring area is provided in front of the opening of the automatic door, but in order to prevent unnecessary opening and closing of the automatic door, the monitoring area along the width direction of the opening depends on the width of the opening and the mounting height of the sensor. It is necessary to adjust the width dimension. For this adjustment, in Patent Document 1, a shield is provided in a portion of the multi-dividing lens for projector that projects light in a direction where light is not projected, and light is not received of the multi-dividing lens for receiver. This is done by providing a shield at the part that collects light from the direction. In the technique of Patent Document 2, a projector that can project light in a direction in which it is not desired to project light on either side of the virtual center line is turned off to eliminate the monitoring area.

Utility model registration No. 3004867 JP 2000-304869 A

  According to the technique of patent document 1, a shield must be provided one by one, and it takes time to assemble and construct it. Moreover, according to the technique of Patent Document 2, the monitoring area can be lost only on one side of the virtual center line, and the monitoring area cannot be set finely.

  An object of the present invention is to provide an automatic door sensor that is easy to assemble and install, and that can set a monitoring area finely according to the width of the opening and the mounting height of the sensor.

  The automatic door sensor of one embodiment of the present invention includes a light projecting unit and a light receiving unit. The light projecting unit includes a plurality of light projectors that perform light projection on the monitoring area near the door, and the optical element changes the light projection of these light projectors in a direction orthogonal to the opening width direction of the door. The light receiving unit includes a light receiver that receives light projected on the monitoring area. Furthermore, a multi-segment lens is provided so that the light projected on the monitoring area is condensed on the light receiver. The multi-segment lens is a combination of a plurality of lenses. The setting unit sets whether or not to cause each of the projectors to perform projection for each of the projectors. The control unit determines whether or not there is a person or an object in the monitoring area from the light reception state of the light receiver.

  In this automatic door sensor, light from a plurality of projectors is changed by an optical element in a direction perpendicular to the opening width direction of the door, and is projected to different locations in the opening width direction of the door in the monitoring area. For example, reflected light from these places is received by the light receiver through each lens portion of the multi-segment lens. The control unit determines the presence or absence of a person or an object from the light reception state of the light receiver. Actually, when light is projected by the setting unit, only the projector that has been set emits light. Therefore, only a specific place in the door opening width direction can be monitored. The monitoring area can be set finely according to the width of the opening and the mounting height of the sensor only by a simple operation of setting which projector is to be projected by the setting unit.

  A plurality of the light receivers can be provided along at least the opening width of the door. The setting unit sets whether or not to determine the presence or absence of a person or an object in the monitoring area from the light reception status of each light receiver according to the light projection status of each light projector. According to this configuration, since a plurality of light receivers are provided, the number of light projectors that project the light received by each light receiver is reduced, and finely adjusted according to the width of the opening and the mounting height of the sensor. A monitoring area can be set, and the presence or absence of a human body or object is not determined based on the light reception status of the light receivers that receive light from non-projected light projectors. Can be prevented.

  Furthermore, three or more projectors may be provided. If comprised in this way, since the area | region which each projector light-projects can be made fine, according to the width | variety of an opening part and the attachment height of a sensor, a monitoring area can be set finely.

  Alternatively, a shielding plate can be provided between the projectors. If comprised in this way, it can prevent that lights other than the light which should originally inject into an optical element. That is, since it is possible to prevent light other than the light to be projected from the optical element from being projected, the monitoring area can be clearly set.

  Or the said light receiver can be provided with two or more in the direction orthogonal to a door opening width direction at least. If comprised in this way, a monitoring area can be set finely also in the direction orthogonal to the door opening width direction.

  The optical element of the light projecting unit may be any of a cylindrical lens, a toric lens, an optical system using a hologram, a slit, or a reflective mirror. When these are used, the light from the projector can be efficiently projected to a desired position in the monitoring area.

  In the aspect described above, a plurality of the light receiving portions can be provided. In this case, the area monitored by each light receiving unit in the monitoring area is provided along a direction orthogonal to the door opening width direction. If comprised in this way, the monitoring area can fully be ensured in the direction orthogonal to a door opening width direction, without enlarging the height of the main body of an automatic door sensor.

  In the aspect described above, a plurality of the light receivers can be provided at least in the door opening width direction. In this case, the light projecting unit is provided so that light is projected from the plurality of light projectors within a light receiving width with respect to a divided portion of the multi-divided lens. With this configuration, for example, light from a plurality of projectors reflected by different monitoring areas can be received by a single light receiver, so depending on the width of the opening and the mounting height of the sensor. Thus, the area can be set finely in the door opening width direction.

  The automatic door sensor according to another aspect of the present invention also includes a light projecting unit and a light receiving unit. The light projecting unit includes a light projector that performs light projection on a monitoring area near the door, and a multi-segment lens in which a plurality of lenses are combined so that the light emitted from the light projector is dispersed in the monitoring area. Yes. The light receiving unit is configured to receive a plurality of light receivers that receive light projected on the monitoring area, and light along a direction orthogonal to the door opening width direction among the light projected on the monitoring area. A plurality of lenses for condensing light to the light receiver. The setting unit sets whether to determine whether or not there is a person or an object in the monitoring area based on the light reception state of the light receiving unit. Based on the setting of the setting unit, the control unit determines the presence or absence of a person or an object in the monitoring area from the light reception state of the light receiver.

  In this aspect, a multi-segment lens is provided on the light projecting unit side, contrary to the above-described aspect. Other than that, since it is the same as the above-described embodiment, the width of the opening and the mounting height of the sensor can be set by simply setting which projector is to be projected by the setting unit. Depending on the situation, it is possible to set the monitoring area in detail. It should be noted that the same modifications as described in the above-described aspect are possible in this aspect.

  As described above, according to the present invention, the monitoring area can be set finely according to the width of the opening and the mounting height of the sensor only by a simple operation of operating the setting unit.

  The automatic door sensor 2 according to the first embodiment of the present invention is attached to the seamless 6 of the automatic door 4 as shown in FIGS. An automatic door 4 shown in FIGS. 1A and 1B opens and closes a door opening between fixed walls 8 and 8 arranged at intervals by door panels 10 and 10 of both draws. For example, as shown in FIG. 1A, the detection range 12 is set so as to detect the outside edge of the fixed walls 8, 8 of the automatic door 4 having a normal height as shown in FIG. Thus, when the automatic door sensor 2 is attached to the automatic door 4a whose door opening width is the same as that of FIG. 1A and only the height is high, the detection range 12 is that of the fixed walls 8 and 8 of the automatic door 4a. Although it spreads outside and is a part that does not require detection, a person or object is detected. In this case, it is necessary to narrow the detection range 12 to a necessary range, and the automatic door sensor 2 can easily adjust the detection range 12.

  As shown in FIGS. 2A and 2B, the automatic door sensor 2 is provided with a plurality of, for example, four projectors 14a to 14d at the center thereof. These projectors 14a to 14d emit light by emitting infrared rays in a pulse shape having a predetermined cycle, for example, and are arranged at a predetermined interval in the door opening width direction. Each of the projectors 14a to 14d has a certain length in the door opening width direction and a direction orthogonal to the door opening width direction, and emits light by emitting light in a planar shape having a long length in the direction orthogonal to the door opening width direction. Do light. In addition, you may make it light-emit by light-emitting planarly with one light-emitting body, or may light-emit by arranging a plurality of small-diameter light-emitting bodies side by side and making it light-emit. Now, on the front surfaces of these projectors 14a to 14d, a plurality of, for example, four lenses 16a to 16d are provided as optical elements corresponding to these projectors 14a to 14d. These lenses 16a to 16d are, for example, cylindrical lenses, and are arranged so that their optical axes form different angles with respect to the door opening width direction. As a result, as shown in FIG. 3, for example, four rectangular light projecting regions 18 a that are formed side by side along the door opening width direction and orthogonal to the door opening width direction by the light from the projectors 14 a to 14 d. To 18d are formed on a reference surface such as a floor surface. A toric lens can also be used as the optical element. In addition, an optical system is used as an optical element that is made of a surface, relief, and hologram pattern and has the same effect as a micro-concave lens array. Thus, the automatic door sensor 2 can be configured to be thin. Further, the projectors 14a to 14d can be constructed at low cost by combining a high-intensity infrared projector element and an optical element as a slit that restricts the angle and position at which light is emitted. In addition, a complicated projection region can be easily formed by disposing a concave reflective mirror as an optical element behind the projectors 14a to 14d.

  The light from these projectors 14a to 14d corresponds to lenses 16a to 16d between the projectors 14a and 14b, between 14b and 14c, between 14c and 14d, and on both sides of the two projectors 14a and 14d on the outside. In order to prevent the lens 16a to 16d other than any one of the lenses 16a to 16d from leaking and malfunctioning, a shielding plate 20 is provided as shown in FIG.

  These light projectors 14a to 14d and lenses 16a to 16d constitute a light projecting unit.

  Light receivers are respectively provided on both sides of the light projecting portion in the door opening width direction. On the right side in FIG. 2 (a), there are three light receivers 22a1 to 22a9 in the door opening width direction, three in the direction orthogonal to the door opening width direction, that is, a total of nine light receivers 22a1 to 22a9 in the form of a 3 × 3 matrix. It is arranged at a close position. Similarly, on the left side, a total of nine light receivers 22b1 to 22b9 in a 3 × 3 matrix are disposed at positions away from the door. The light receivers on both sides of these projectors 14 are arranged so as not to overlap.

  Multi-divided lenses 24a and 24b for condensing light from different positions in the door opening width direction on the same light receiver are respectively arranged on the front surfaces of the right and left light receivers 22a1 to 22a9 and 22b1 to 22b9. The multi-divided lenses 24a and 24b are divided into four in the door opening width direction so as to correspond to the light projecting areas 18a to 18d described above, and the light reflected from the light projecting areas 18a to 18d is received by each light receiver 22a1. To 22a9 and 22b1 to 22b9. The light receiving areas on the floor surface that generate the reflected light received by the respective light receivers 22a1 to 22a9 and 22b1 to 22b9 are indicated by circles in the respective light projecting areas 18a to 18d in FIG. These light receiving areas correspond to a total of nine light receiving areas 26a1 to 26a9 and light receivers 22b1 to 22b9 on the side far from the door opening corresponding to the light receivers 22a1 to 22a9 in the light projecting areas 18a to 18d. And a total of nine receiving areas 26b1 to 26b9 on the side close to the door opening.

  The light receivers 22a1 to 22a9 and the multi-divided lens 24a constitute one light-receiving unit, and the light receivers 22b1 to 22b9 and the multi-divided lens 24b constitute one light-receiving unit.

  As shown in FIG. 4, the projectors 14 a to 14 d that receive the projection instruction signal from the projection switching unit 28 emit light. It is possible to repeatedly supply the light projection instruction signals to the light projectors 14a to 14d in order, or to sequentially supply the light projection instruction signals to the light projectors selected from the light projectors 14a to 14d. The light projection switching unit 28 generates this light projection instruction signal in accordance with an instruction from the control unit 30.

  Each of the light receivers 22a1 to 22a9 and 22b1 to 22b9 receives light from the corresponding light receiving regions 26a1 to 26a9 and 26b1 to 26b9 each time the light projectors 14a to 14d emit light one by one, and receives light as a light reception signal. Generate information. The light reception information of the light receivers 22 a 1 to 22 a 9 and 22 b 1 to 22 b 9 selected by the light reception switching unit 32 is converted into digital light reception information by the A / D converter 34 and supplied to the control unit 30. The light reception switching unit 32 selects light reception information from one of the light receivers 22a1 to 22a9 and 22b1 to 22b9 when any one of the light projectors 14a to 14d is projecting according to an instruction from the control unit 30. . However, the light reception switching unit 32 repeatedly selects light reception information of all the light receivers 22a1 to 22a9 and 22b1 to 22b9 in order according to an instruction from the control unit 30.

  The control unit 30 compares the digital light reception information supplied from the A / D converter 34, which is determined to be adopted in advance, with a preset threshold value, and converts the digital light reception information into the digital light reception information according to the comparison result. It is determined whether a person or an object exists in the corresponding light receiving areas 26a1 to 26a9 and 26b1 to 26b9. The determination result is supplied to the door controller 42 via the output unit 36, the communication interface 38, and the bus 40 in the control unit 30. The door controller 42 opens or closes the door panels 10 and 10 according to the determination result. Note that the bus 40 is configured by, for example, a CAN (Controller Area Network).

  As described above, the control unit 30 gives an instruction to the light projection switching unit 28, and this instruction is performed based on the setting contents of the setting unit 44 in the control unit 30. Further, only the adopted digital light reception information is compared with the threshold value, but which digital light reception information is adopted is also set in the setting unit 44. In addition, the threshold value described above is also set in the setting unit 44. These are set in the setting unit 44 via the wireless communication interfaces 48 and 50, the bus 40, and the communication interface 38 from a portable operation unit operated by the user, for example, the PDA 46.

  FIGS. 5A and 5B show how the light projecting areas 18 a to 18 d and the light receiving area change depending on the setting of the setting unit 44. FIG. 5A shows a case where, for example, monitoring in the door opening width direction can be performed by the light projecting areas 18b and 18c and the light receiving area inside the light projecting areas 18b and 18c. In this case, a projection instruction is not given to the projectors 14a and 14d so that projection is not performed on the projection areas 18a and 18d. Further, in order to eliminate the influence of disturbance, the light receiving information generated by the light receivers 22a1 to 22a9 and 22b1 to 22b9 corresponding to the light receiving areas in the light projecting areas 18a and 18b is set by the setting unit 44 so as not to be compared with the threshold value. It may be set. Instead of not comparing with the threshold value, light may not be received. Now, Fig.5 (a) corresponds to the case where the height dimension of an automatic door is large as shown in FIG.1 (b).

  FIG. 5 (b) shows a case where the automatic door shown in FIG. 5 (a) is applied to an automatic door that is somewhat wider than the automatic door and whose height is somewhat smaller. A light projection instruction is given to all of the projectors 14a to 14d so that the regions 18a to 18d are formed. However, the light receivers (light receivers 22a1 to 22a9 and 22b1 to 22b9 when the light projectors 14a and 14d are projecting) receive light from the light receiving area outside the door opening width of the light projecting areas 18a and 18d. The light receiving information of some of the light receivers) is set by the setting unit 44 so as not to be compared with the threshold value. Instead of not comparing with the threshold value, light may not be received.

  FIG. 6 shows how the control unit 30 controls the projectors 14a to 14d, the light receivers 22a1 to 22a9, and 22b1 to 22b9 according to the setting of the setting unit 44 described above, and how to determine the presence or absence of a human body or an object. It is the flowchart which showed whether to do.

  First, the control part 30 confirms the setting of the setting part 44, and judges whether the light projection of the light projector 14a is instruct | indicated (step S2). If the answer to this determination is yes, the projector 14a is instructed to switch so that the projector 14a emits light (step S4). Next, the light reception switching unit 32 is switched so that the light reception information of the light receiver 22a1 is input to the A / D converter 34 (step S6). The control unit 30 waits for a period of time until the light reception information is stabilized, i.e., the time when the influence of the switching noise is eliminated (step S8), and the value obtained by A / D converting the light reception information of the light receiver 22a1 corresponds to the light projector 14a. Store (step S10). Next, the light reception switching unit 32 is switched so that the light reception information of the light receiver 22a2 is input to the A / D converter 34 (step S12). The control unit 30 waits for a time until the received light information is stabilized, i.e., the time when the influence of the switching noise is eliminated (step S14), and the value obtained by A / D converting the received light information of the light receiver 22a2 corresponds to the projector 14a. Store (step S16). Hereinafter, similarly, the light reception information of each of the light receivers 22a3 to 22b8 is stored in the control unit 30 as corresponding to the projector 14a in order. Then, similarly to steps S8, 10 and 12, the light receiving switching unit 32 is switched (step S18), standby (step S20) and stored (step S22) with respect to the light receiver 22b9.

  Subsequent to step S22 or if the answer to the determination in step S2 is no, it is determined whether or not the projector 14b is instructed to project light (step S24). Therefore, if the answer to the determination in step S2 is no, the processes in steps S4 to S22 described above are not executed, and light reception information for the light projection region 18b is not collected.

  If the answer to the determination in step S24 is yes, the projector 14b is instructed to switch so that the projector 14b emits light (step S26). Next, the light reception switching unit 32 is switched so that the light reception information of the light receiver 22a1 is input to the A / D converter 34 (step S28). The control unit 30 waits for a period of time until the light reception information is stabilized, that is, the time when the influence of the switching noise is eliminated (step S30), and the value obtained by A / D conversion of the light reception information of the light receiver 22a1 corresponds to the light projector 14b. Store (step S32). Hereinafter, similarly, the received light information of each of the light receivers 22a2 to 22b9 is stored in the control unit 30 in the same manner as corresponding to the projector 14b.

  After the light reception information of the light receiver 22b9 is stored in the control unit 30 as corresponding to the light projector 14b, or when the answer to the determination in step S24 is no, it is determined whether the light projection of the light projector 14c is instructed (step S34). ). If the answer to this determination is yes, the light reception information of each of the light receivers 22a1 to 22b9 is stored in order as corresponding to the light projector 14c in the same manner as described above. Following this, or if the answer to the determination in step S34 is no, it is determined whether or not the projector 14d is instructed to project light (step S36). If the answer to this determination is yes, the received light information of each of the light receivers 22a1 to 22b9 is stored in order as corresponding to the projector 14d in the same manner as described above.

  After the light reception information of the light receiver 22b9 is stored in the control unit 30 as corresponding to the projector 14d, or when the answer to the determination in step S36 is NO, the setting unit 44 among the digital light reception information stored in the control unit 30 The light reception information adopted by the setting information set to is compared with a threshold value to determine whether an object or the like exists (step S38). If the answer to this determination is yes, an opening signal is output to the door controller 42 (step S40). As a result, the door panel is opened, and the process is executed again from step S2. Even if the answer to the determination in step S40 is no, the process is executed again from step S2.

  FIG. 7 is a flowchart showing the processing performed when the control unit 30 receives data from the PDA 46. It is determined whether a setting value that is data has been received (step S42). In this case, the setting value of the setting unit 44 is updated (step S44), and this process is terminated. This process is also terminated if the answer to the determination in step S42 is no.

  FIGS. 8A, 8B, 8C, and 8D schematically show setting values set in the setting unit 44. FIGS. 8A and 8C are projectors. 14a to 14d, and light projection or non-light projection is set. FIGS. 7B and 7D show part of the set values for each of the light receivers 22a1 to 22b9, related to the projector 14a, and it is set whether the light reception information is adopted or not. Yes. Although set values for the other projectors 14b to 14d are also set, they are not shown. In addition, the figure (a), (b) has shown the case corresponding to Fig.5 (a), The figure (c), (d) shows the case corresponding to FIG.5 (b). Yes.

  As described above, in the automatic door sensor 2, it is possible to arbitrarily select whether to determine the presence or absence of a human body or the like based on which of the light projector to project and the light reception information of the light receiver according to the setting of the setting unit 44. It is possible to easily cope with the door. In addition, since the light from each of the projectors 14a to 14d is circulated and projected, even if each of the light receivers is configured to receive light from a plurality of regions by the multi-segment lenses 24a and 24b, the light is projected. Since light is not received from an area that is not provided, the S / N ratio is improved as compared with an automatic door sensor using a general multi-segment lens. Since the light is deflected by the lenses 16a to 16d, the light projecting areas 18a to 18d are projected with a sufficient amount of light, and the S / N ratio is further improved.

  An automatic door sensor 2a according to a second embodiment of the present invention is shown in FIGS. In the automatic door sensor 2a, as shown in FIG. 9, the structure of the light projection part which consists of the light projectors 14a thru | or 14d and the lenses 16a thru | or 16d is the same as the automatic door sensor 2 of 1st Embodiment. Only one light receiving unit is provided, and one light receiver 122 having a larger area than the light receivers 22a1 to 22a9 and 22b1 to 22b9 of the automatic door sensor 2 of the first embodiment is used.

  Therefore, as shown in FIG. 10, the same light projecting areas 18a to 18d as the automatic door sensor 2 are formed, but one large light receiving area 126 is formed for each of the light projecting areas 18a to 18d. Since the other configuration is the same as that of the automatic door 2, a detailed description thereof will be omitted.

  When the automatic door sensor 2a is attached to the automatic door shown in FIG. 11 different from the automatic door shown in FIG. 10, as a result of detecting the human body or the like on both sides, the light projection of the projectors 14a and 14d is sent to the setting unit 44. It is stopped by the setting, and the light projection to the light projection areas 18a and 18d is stopped. In the process performed by the control unit 30, it is determined whether or not the projector 14a is instructed to project in step S2 shown in FIG. 6. If the answer to this determination is yes, the projector 14a projects in step S4. Then, the projection switching unit 28 is instructed to switch. A value obtained by A / D converting the light reception information of the light receiver 122 is stored in the control unit 30 as corresponding to the light projector 14a, and then it is determined whether or not the light projection of the light projector 14b indicated in step S24 is instructed. Thereafter, the same operation is performed for the other projectors 14b to 14d. Of the digital light reception information stored in the control unit 30 corresponding to each of the projectors 14a to 14d, the light reception information adopted by the setting unit 44, the light reception information corresponding to the projectors 14b and 14c in the case of FIG. Determine if it exists.

  An automatic door sensor 2b according to a third embodiment of the present invention is shown in FIGS. In this automatic door sensor 2b, as shown in FIG. 12, a plurality of, for example, 18 projectors 214a to 214r that generate spot light are arranged in a matrix of three in the door opening width direction and six in the direction orthogonal to the door opening width direction. Are arranged in a shape. A multi-dividing lens 224 identical to the multi-dividing lenses 24a and 24b of the automatic door sensor 2 is arranged in the same manner as the multi-dividing lenses 24a and 24b in front of the automatic door sensor 2, thereby constituting a light projecting unit. As a result, as shown in FIG. 13, the combined light projecting region 218 is composed of a total of 18 light projecting regions 218a to 218r, three along the door opening width direction and six in the direction orthogonal to the door opening width direction. Four are formed along the door opening width direction.

  Also, as shown in FIG. 12, a light receiving portion is formed by four planar light receivers 222a to 222d and four lenses 216a to 216d arranged as optical elements in front of them. Note that a planar light receiver may be configured by arranging a plurality of small-diameter light receivers. The light receivers 222a to 222d are arranged along a direction orthogonal to the door opening width direction, and are arranged in a row along the door opening width direction. Then, by adjusting the direction and inclination of the lenses 216a to 216d, as shown in FIG. 13, four light receiving areas 226a to 226d that respectively cover the four combined light projecting areas 218 described above are formed.

  FIG. 14 is a block diagram showing a circuit configuration of the automatic door sensor 2b. The same reference numerals are given to the same parts as the automatic door sensor 2, and the description thereof is omitted.

  The control by the control unit 30 in the automatic door sensor 2b is as shown in FIG. First, the control unit 30 confirms the setting of the setting unit 44 and switches the light reception switching unit 32 so that the light reception information of the light receiver 22a is input from the A / D converter 34 (step S46). Next, it waits for a period of time until the received light information is stabilized, that is, the influence of switching noise is eliminated (step S48), and switches to the light projection switching unit 28 so that the light projector 14a emits light according to the setting of the setting unit 44. (Step S50). Then, the value obtained by A / D converting the light reception information of the light receiver 22a is stored in the control unit 30 as corresponding to the light projector 14a (step S52). Hereinafter, similarly, each of the projectors 14b to 14p is projected, and a value obtained by A / D conversion of the received light information is stored in the control unit 30 as corresponding to the projector 14a. Then, the last projector 14r is projected (step S54), and the value obtained by A / D converting the received light information is stored in the control unit 30 as corresponding to the light receiver 22a (step S56).

  Subsequent to step S56, the setting of the setting unit 44 is confirmed, and the light reception switching unit 32 is switched so that the light reception information of the light receiver 22b is input from the A / D converter 34 (step S58). Next, it waits for the time until the light reception information is stabilized (step S60), and instructs the light projection switching unit 28 to switch so that the light projector 14a emits light according to the setting of the setting unit 44 (step S62). Hereinafter, similarly, a value obtained by A / D converting the light reception information of the light receiver 22b is stored in the control unit 30 as corresponding to the light projector 14a, and the other light projectors 14b to 14r are similarly processed.

  Subsequently, the setting of the setting unit 44 is confirmed, and the light reception switching unit 32 is switched so that the light reception information of the light receiver 22c is input from the A / D converter 34 (step S64). Next, it waits for the time until the light reception information is stabilized (step S66), and instructs the light projection switching unit 28 to switch the light so as to emit light according to the setting of the setting unit 44 (step S67). As described above, the received light information corresponding to the projectors 14a to 14r is sequentially stored.

  Subsequently, the setting of the setting unit 44 is confirmed, and the light reception switching unit 32 is switched so that the light reception information of the light receiver 22d is input from the A / D converter 34 (step S68). Next, it waits for a time until the light reception information is stabilized (step S70), and the projector 14a is projected according to the setting of the setting device 44 (step S72). Thereafter, the projectors 14a to 14r are caused to emit light in the same manner as described above. Corresponding light reception information is sequentially stored.

  Next, among the digital light reception information corresponding to each of the light projectors 14a to 14r in each of the light receivers 22a to 22d stored in the control unit 30, the light reception information adopted by the setting information set in the setting unit 44 is set as a threshold value. In comparison, it is determined whether an object or the like exists (step S74). If the answer to this determination is yes, an opening signal is output to the door controller 42 (step S76). As a result, the door panel is opened, and the process is executed again from step S46. Even if the answer to the determination in step S74 is no, the process is executed again from step S46. Therefore, for example, as shown in FIG. 16, by setting the light reception information of some light reception areas in the light projection areas 226b and 226c so as not to be compared with the threshold value, fine area setting is performed according to the passage situation. Can do. In addition, since the projector is sequentially projected after the light receiving unit is in a standby state where light can be received first, the total number of switching of the A / D converter 34 is reduced. As a result, the standby time of the light receiving unit (the switching noise is reduced). The total amount of time that does not have an influence) can be made shorter than that of the automatic door sensor 2.

  In the process shown in FIG. 6 in the automatic door sensor 2 of the first embodiment, “whether each projector is set to emit light in the setting unit shown in steps S2, S24, S34, S36, etc. The automatic door sensor 2 can also perform a process in which all of the projectors are sequentially projected so that the “determination” is performed.

  An automatic door sensor 2c according to a fourth embodiment of the present invention is shown in FIGS. In the automatic door sensor 2c, the light projecting parts in the automatic door sensor 2b of the third embodiment are arranged on both sides of the light receiving part. Each of the light projecting units has nine projectors 314a1 to 314a81 and 314b1 to 314b81, nine in the door opening width direction and nine in the direction orthogonal to the door opening width direction. These projectors 314a1 to 314a81 and 314b1 to 314b81 are arranged so as not to overlap. As a result, as shown in FIG. 18, four combined light projecting areas 318a and 318b each consisting of a total of 162 light projecting areas 318a1 to 318a81 and 318b1 to 318b81 are formed along the door opening width direction.

  In the light receiving portion, twelve light receivers 322a to 322l are arranged along the door opening width direction, and each has a planar shape that is long in a direction orthogonal to the door opening width direction. Twelve lenses 316a to 316l are arranged as optical elements in front of the light receivers 322a to 322l, corresponding to these. Accordingly, as shown in FIG. 18, a total of twelve light receiving regions 326a to 326l are formed along the door opening width direction. The light receiving areas 326a to 326l include three light projecting areas in the form of a matrix of 3 in the door opening width direction and 18 in the direction perpendicular to the door opening width direction, that is, 3 × 18. The directions and inclinations of the lenses 316a to 316l are determined.

  The circuit configuration of the automatic door sensor 2c is the same except that the number of light receivers and projectors is increased in the block diagram shown in FIG. Since the automatic door sensor 2c operates in the same manner as the automatic door sensor 2 except that the number of light receivers and projectors is increased, description of the operation is omitted. Since the automatic door sensor 2c has a large number of light projecting elements and light receiving elements, it can detect a human body or the like with high resolution, and, similarly to the automatic door sensor 2b, a standby time (a time enough to eliminate the influence of switching noise). Therefore, even if a large number of projectors are used, the time required for detecting the presence or absence of a human body does not increase.

  An automatic door sensor 2d according to a fifth embodiment is shown in FIGS. Similar to the automatic door sensor 2 of the first embodiment, the automatic door sensor 2d has a light projecting portion at the center and light receiving portions on both sides thereof. As in the first embodiment, a plurality of, for example, twelve planar light projectors 414a to 414l are arranged vertically along the door opening width direction. In front of these, lenses 416a to 416l are arranged as optical elements, respectively. As a result, as shown in FIG. 20, a total of 16 light projecting regions 418a to 418l are formed along the door opening width direction. These light projecting areas 418a to 418l are formed on the floor surface so as to be orthogonal to the door opening width direction.

  The light receiving units have planar light receivers 422a and 422b, respectively. These are horizontally long, that is, formed long in the door opening width direction, and are arranged so as not to overlap. Multi-divided lenses 424a and 424b divided into four are arranged on the front surfaces of the light receivers 22a and 22b in the same manner as the multi-divided lenses 24a and 24b. As a result, as shown in FIG. 20, four light receiving regions 426b by the light receiver 422b are formed in the vicinity of the door opening along the door opening width direction, and the light receiving device 422a is separated from the door opening along the door opening width direction. The four light receiving regions 426a are formed. In these light receiving areas 426a and 426b, projector areas 418a to 418l are arranged so as to overlap each other.

  The circuit configuration of the automatic door sensor 2d is the same except that the number of light receivers and projectors is increased in the block diagram shown in FIG. Since this automatic door sensor 2d operates in the same manner as the automatic door sensor 2 except that the number of light receivers and projectors is increased, description of the operation is omitted.

  An automatic door sensor 2e of the sixth embodiment is shown in FIGS. This automatic door sensor is configured in the same manner as the automatic door sensor 2d except that the configurations of the two light receiving units are different. Equivalent parts are denoted by the same reference numerals and description thereof is omitted. In the light receiving portion, instead of the planar light receiver, nine light receivers 522a1 to 522a9 and 522b1 to 522b9 for spot light reception are three in the door opening width direction and three in the direction orthogonal to the door opening width direction. Are arranged in a matrix. These light receivers 522a1 to 522a9, 522b1 to 522b9, and the multi-segment lenses 424a and 424b on the front face thereof, as shown in FIG. 22, in the direction orthogonal to the door opening width direction, three in the door opening width direction. Four sets of six circular light receiving areas 526a1 to 526a9, 526b1 to 526b9 are formed along the door opening width direction. In these light receiving areas 526a1 to 526a9, 526b1 to 526b9, the orientations of the multi-segment lenses 424a and 424b are set so that the six light receiving areas overlap each other in the light projecting areas 418a to 418l.

  The circuit configuration of the automatic door sensor 2e is the same except that the number of light receivers and light projectors is increased in the block diagram shown in FIG. Since the automatic door sensor 2e operates in the same manner as the automatic door sensor 2 except that the number of light receivers and projectors is increased, description of the operation is omitted. Note that, by performing the same operation as that of the automatic door sensor 2b, the total waiting time (the time to eliminate the influence of switching noise) is shortened. Therefore, even if a large number of projectors are used, the time required for detection is long. Never become.

  An automatic door sensor 2f according to a seventh embodiment is shown in FIGS. In the automatic door sensor 2f, eight light projectors 614a to 614h are provided in the light projecting unit, and lenses 616a to 616h are disposed as optical elements in front of these light projectors. Accordingly, as shown in FIG. 24, eight light projecting regions 618a to 618h are formed along the door opening width direction. In the two light receiving units, the three light receivers 622a1 to 622a3 and 622b1 to 622b3 arranged in one row are arranged so as not to overlap each other. Multi-division lenses 624a and 624b in front of them are divided into eight according to the number of projectors 614a to 614h. In addition, the multi-segment lenses 624a and 624b are arranged so that the light receiving areas 626a1 to 626a3 and 626b1 to 626b3 formed by the light receivers 622a1 to 622a3 and 622b1 to 622b3 overlap with each of the light projecting areas 618a to 618h. Tilt is set. The circuit configuration of the automatic door sensor 2f is the same except for the difference in the number of light receivers and projectors in the block diagram shown in FIG. Since the automatic door sensor 2f operates in the same manner as the automatic door sensor 2 except that the number of light receivers and projectors is different, description of the operation is omitted. By performing the same operation as that of the automatic door sensor 2b, the total waiting time (the time when switching noise is not affected) is shortened. Therefore, even if a large number of projectors are used, the time required for detection is long. Never become.

  An automatic door sensor 2g according to the eighth embodiment is shown in FIGS. In this automatic door sensor 2g, the light projecting unit has eight light projectors 714a to 714h that project spot light, and these are four matrixes in the door opening width direction and two matrices in the direction orthogonal to the door opening width direction. Arranged in a shape. Lenses 716a to 716h are arranged in front of the projectors 714a to 714h, respectively. As shown in FIG. 26, there are four circular light projecting areas 718a to 718h along the door opening width direction. Two are formed in a direction orthogonal to the direction.

  In the two light receiving sections on both sides of the light projecting section, nine light receivers 722a1 to 722a9 and 722b1 to 722b9 each receiving spot light have a matrix of three in the door opening width direction and three in the direction orthogonal to the door opening width direction. The two matrix bodies are arranged so as not to overlap each other. Multi-divided lenses 724a and 724b are arranged in front of these nine light receivers 722a1 to 722a9 and 722b1 to 722b9, and three in the light projecting areas 718a to 718h, respectively, in the door opening width direction and orthogonal to the door opening width direction. A total of nine light receiving regions 726a1 to 726a9 and 726b1 to 726b9 are provided in the direction. Since the circuit configuration of the automatic door sensor 2g is the same as that in the block diagram shown in FIG. 4 except that the number of light receivers and projectors is different, detailed description thereof is omitted. Since the automatic door sensor 2g operates in the same manner as the automatic door sensor 2 except that the number of light receivers and projectors is different, the description of the operation is omitted. By performing the same operation as that of the automatic door sensor 2b, the total waiting time (the time when switching noise is not affected) is shortened. Therefore, even if a large number of projectors are used, the time required for detection is long. Never become.

  An automatic door sensor 2h according to a ninth embodiment is shown in FIGS. In the automatic door sensor 2h, the light projecting unit has four planar light projectors 814a to 814d. These projectors 814a to 814d are arranged along a direction orthogonal to the door opening width direction so that the length direction thereof is along the door opening width direction. In front of these, lenses 816a to 816d are arranged as optical elements. As a result, as shown in FIG. 28, rectangular projection areas 818a to 818d each having a length along the door opening width are arranged in a direction orthogonal to the door opening width direction.

  In each of the two light receiving units, 12 spot light receiving devices 822a1 to 822a12 and 822b1 to 822b12 are arranged in a matrix, with six in the door opening width direction and two in the direction orthogonal to the door opening width direction. These matrix bodies are arranged so as not to overlap in the door opening width direction. In front of these light receivers 822a1 to 822a12 and 822b1 to 822b12, multi-segment lenses 824a and 824b are divided into four so as to disperse light in a direction orthogonal to the door opening width direction. Thus, as shown in FIG. 28, the light receiving regions 826a1 to 826a12 formed by the light receivers 822a1 to 82a12 and the light receiving regions 826b1 to 826b12 formed by the light receivers 822b1 to 822b12 are included in the respective light projecting regions 818a to 818d. Are arranged to be arranged.

  The circuit configuration of the automatic door sensor 2h is the same except for the difference in the number of light receivers and projectors in the block diagram shown in FIG. Since the automatic door sensor 2g operates in the same manner as the automatic door sensor 2 except that the number of light receivers and projectors is different, the description of the operation is omitted. Note that, by performing the same operation as that of the automatic door sensor 2b, the total waiting time (the time to eliminate the influence of switching noise) is shortened. Therefore, even if a large number of projectors are used, the time required for detection is long. Never become.

  An automatic door sensor 2i according to the tenth embodiment is shown in FIG. This automatic door sensor 2i is the same as the automatic door sensor 2 of the first embodiment, but instead of one light receiving unit, 18 light receivers 922a to 922r are arranged in the door opening width direction and three in the door opening width direction. Six are arranged in a matrix in the orthogonal direction. Since other configurations are the same as those of the automatic door sensor 2 of the first embodiment, the same portions are denoted by the same reference numerals, and the description thereof is omitted. This also forms a light projecting area and a light receiving area as shown in FIG.

It is a figure which shows the use condition of the sensor for automatic doors of the 1st Embodiment of this invention. It is the front view and top view of the sensor for automatic doors of FIG. It is a figure which shows the detection area | region formed with the sensor for automatic doors of FIG. It is a block diagram of the sensor for automatic doors of FIG. It is a figure which shows the state which changed the detection area | region with the sensor for automatic doors of FIG. It is a flowchart relevant to the light projection and light reception of the sensor for automatic doors of FIG. It is a flowchart relevant to the setting in the sensor for automatic doors of FIG. It is a figure which shows the setting state of the setting part in the sensor for automatic doors of FIG. It is the front view and top view of the sensor for automatic doors of the 2nd Embodiment of this invention. It is a figure which shows the detection area | region formed with the sensor for automatic doors of FIG. It is a figure which shows the state which changed the detection area | region with the sensor for automatic doors of FIG. It is the front view and top view of the sensor for automatic doors of the 3rd Embodiment of this invention. It is a figure which shows the detection area | region formed with the sensor for automatic doors of FIG. It is a block diagram of the sensor for automatic doors of FIG. It is a flowchart relevant to the light projection and light reception of the sensor for automatic doors of FIG. It is a figure which shows the state which changed the detection area | region with the sensor for automatic doors of FIG. It is the front view and top view of the sensor for automatic doors of the 4th Embodiment of this invention. It is a figure which shows the detection area | region formed with the sensor for automatic doors of FIG. It is the front view and top view of the sensor for automatic doors of the 5th Embodiment of this invention. It is a figure which shows the detection area | region formed with the sensor for automatic doors of FIG. It is the front view and top view of the sensor for automatic doors of the 6th Embodiment of this invention. It is a figure which shows the detection area | region formed with the sensor for automatic doors of FIG. It is the front view and top view of the sensor for automatic doors of the 7th Embodiment of this invention. It is a figure which shows the detection area | region formed with the sensor for automatic doors of FIG. It is the front view and top view of the sensor for automatic doors of the 8th Embodiment of this invention. It is a figure which shows the detection area | region formed with the sensor for automatic doors of FIG. It is the front view and top view of the sensor for automatic doors of the 9th Embodiment of this invention. It is a figure which shows the detection area | region formed with the sensor for automatic doors of FIG. It is the front view and top view of the sensor for automatic doors of the 10th Embodiment of this invention.

Explanation of symbols

14a to 14d Projector 16a to 16d Lens (optical element)
22a1 to 22a9 22b1 to 22b9 Light receivers 24a and 24b Multi-segment lens 30 Control unit 44 Setting unit

Claims (9)

A plurality of projectors in which light is circulated to a monitoring area in the vicinity of the door; and a light projecting unit provided with an optical element that changes the light projection of the projector in a direction perpendicular to the opening width direction of the door; ,
A multi-divided lens in which a plurality of lenses, which are provided so as to collect the light projected on the monitoring area and the light receiver projected on the monitoring area, are combined. A light receiving unit comprising:
Whether or not to cause each of the projectors to perform projection, a setting unit that is set for each projector, and
A control unit for determining the presence or absence of a person or an object in the monitoring area from the light reception state of the light receiver;
Equipped with automatic door sensor.   2. The automatic door sensor according to claim 1, wherein a plurality of the light receivers are provided along at least an opening width of the door, and the setting unit detects a person in the monitoring area based on a light reception state of each of the light receivers. Alternatively, an automatic door sensor in which whether or not to determine the presence or absence of an object is set according to the light projecting status of each projector.   3. The automatic door sensor according to claim 2, wherein three or more projectors are provided.   3. The automatic door sensor according to claim 2, wherein a shielding plate is provided between the projectors.   3. The automatic door sensor according to claim 2, wherein a plurality of the light receivers are provided in a direction orthogonal to at least a door opening width direction.   2. The automatic door sensor according to claim 1, wherein the optical element is any one of a cylindrical lens, a toric lens, an optical system using a hologram, a slit, or a reflective mirror.   2. The automatic door sensor according to claim 1, wherein a plurality of the light receiving portions are provided, and an area monitored by each of the light receiving portions in the monitoring area is provided along a direction orthogonal to the door opening width direction. Automatic door sensor.   2. The automatic door sensor according to claim 1, wherein a plurality of the light receivers are provided at least in the door opening width direction, and the light projecting unit includes a plurality of the light receivers within a light receiving width with respect to a divided portion of the multi-divided lens. A sensor for an automatic door provided so that light is emitted from a projector. A projector that includes a projector that performs light projection on a monitoring area near the door, and a multi-segment lens in which a plurality of lenses are combined so that the projection of the projector is dispersed in the monitoring area;
A plurality of light receivers that receive light projected on the monitoring area, and light along the direction orthogonal to the door opening width direction among the light projected on the monitoring area to each light receiver. A light receiving unit comprising a plurality of condensing lenses;
A setting unit for setting whether or not a determination of the presence or absence of a person or an object in the monitoring area is performed based on a light reception state of the light receiver;
A control unit for determining the presence or absence of a person or an object in the monitoring area from the light reception status of the light receiver based on the setting of the setting unit;
Equipped with automatic door sensor.

Images