JP5191786B2 - Automatic door sensor - Google Patents

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 a projector / receiver monitor a plurality of detection ranges in a monitoring area. For example, in the sensor disclosed in Patent Document 1, light from a plurality of light projecting elements is divided using a multi-segment lens, and the divided light is projected to various positions in the monitoring area. The reflected light is condensed by a multi-segment lens and received by a light receiving element.

JP 2000-160938 A

  However, in this configuration, since the light obtained by dividing the light of the light projecting element by the multi-segment lens is received by the light receiving element, the amount of light incident on the light receiving element is small and the S / N ratio is low. In order to improve the S / N ratio, it is necessary to increase the light projection amount of each light projecting element. Therefore, power consumption increases, and it is necessary to provide a margin for the circuit pattern for supplying power to each light projecting element. As a result, the light projecting elements cannot be arranged close to each other, and the multi-segment lens used together with the light projecting elements becomes large. Along with this, the multi-segment lens used together with the light receiving element becomes large, and the whole automatic door sensor becomes large.

  An object of this invention is to provide the sensor for automatic doors which improved S / N ratio, without enlarging.

The automatic door sensor of one embodiment of the present invention includes a light projecting unit and a light receiving unit. Light projecting unit is for performing circulating projecting light to the monitoring area of the door near comprise a plurality of projectors performed by circulating the light projecting optical element is provided corresponding to these light projector, The optical element deflects the light projection of each projector in the door opening width direction or a direction orthogonal to the door opening width direction, and causes the optical elements to project the plurality of monitoring areas . The light receiving unit includes a light receiver, and a multi-divided lens in which a plurality of lenses are combined and provided so as to collect corresponding light among the light projected on the plurality of monitoring areas on the light receiver. Is provided. The multi-segment lens is a combination of a plurality of lenses. The number of the projectors and the number of the light receivers are different. A control part compares the light reception signal of the said light receiver with the predetermined threshold value, and judges the presence or absence of the person or object in the said monitoring area.

  In this automatic door sensor, light from a plurality of projectors is deflected by an optical element in the door opening width direction or in a direction perpendicular to the door opening width direction, and is projected to different locations in the door opening width direction of the monitoring area. The The reflected light from these places is received by a light receiver arranged one-dimensionally or two-dimensionally, for example, via 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. Since the light from the projector is deflected by the optical element without being divided, the amount of light at the light receiver does not decrease. Therefore, the S / N ratio is improved as compared with the divided one. Moreover, in order to improve the S / N ratio, the light projection amount of the projector is not increased, so that the projector can be arranged close to the projector, and there is no need to increase the size of the multi-segment lens on the receiver side. The entire automatic door sensor does not become large.

  The optical element may be any of a cylindrical lens, a toric lens, an optical system using a hologram, a slit, or a reflective mirror. By using such an optical element, light can be efficiently projected into the monitoring area.

  Alternatively, a plurality of the light receiving portions can be provided. In this case, the area monitored by each light receiving section is provided along a direction orthogonal to the door opening width direction. With this configuration, the automatic door sensor itself does not increase in size as described above, and a monitoring area can be sufficiently secured in the passage direction that is a direction orthogonal to the door opening width direction.

  Alternatively, a plurality of the projectors can be provided in a direction orthogonal to the deflection direction. In this case, the optical element is a spherical lens, an aspherical lens, or a Fresnel lens. When these optical elements are used, it is possible to make the light projection state in the monitoring area uniform.

  As described above, according to the present invention, the S / N ratio can be improved without increasing the size of the automatic door sensor.

  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 the light projectors 14a to 14d are arranged so as to be shifted in the vertical direction in the drawing so that the light projecting areas do not overlap. Note that the position and angle of the lens may be shifted instead of shifting the light receiver.

  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 light 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. Furthermore, in order to eliminate the influence of disturbance, the light reception information generated by the light receivers 22a1 to 22a9 and 22b1 to 22b9 corresponding to the light reception areas 26a1 to 26a9 and 26b1 to 26b9 in the light projection areas 18a and 18d is compared with a threshold value. It may be set by the setting unit 44 so as not to be performed. 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 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 S6, S8, S10, the light receiving switching unit 32 is switched (step S18), standby (step S20), and stored (step S22) for 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 light reception information of each of the light receivers 22a2 to 22b9 is stored in the control unit 30 as corresponding to the projector 14b in order.

  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 or not the light projection of the light projector 14c is instructed (step S34). . When the answer to this determination is yes, the received light information of each of the light receivers 22a1 to 22b9 is stored in the control unit 30 in order as corresponding to the 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). When the answer to this determination is yes, the received light information of each of the light receivers 22a1 to 22b9 is stored in the control unit 30 in order as corresponding to the light 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 digital light reception information stored in the control unit 30 is set in the setting unit 44. The light reception information adopted by the set setting information 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). Thereby, the door panels 10 and 10 are opened, and the process is executed again from Step S2. Even if the answer to the determination in step S38 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 2d according to a third embodiment of the present invention 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. 13, 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. Accordingly, as shown in FIG. 13, four light receiving regions 426b are formed by the light receiver 422b 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 for the difference in the number of light receivers and projectors in the block diagram shown in FIG. Since the 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 different, the description of the operation is omitted.

  14 and 15 show an automatic door sensor 2e according to a fourth embodiment of the present invention. The automatic door sensor 2e 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. 15, three in the door opening width direction and in the direction orthogonal to 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 for the difference in the number of light receivers and projectors 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 different, the description of the operation is omitted.

  An automatic door sensor 2g according to a fifth embodiment of the present invention 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, and as a result, four circular projection areas 718a to 718h are arranged along the door opening width direction, as shown in FIG. 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, description of the operation is omitted.

  An automatic door sensor 2h according to a sixth embodiment of the present invention 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. 19, rectangular light 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. Accordingly, as shown in FIG. 19, the light receiving regions 826a1 to 826a12 formed by the light receivers 822a1 to 822a12 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 2h 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.

  An automatic door sensor 2i according to a seventh embodiment of the present invention 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 automatic door sensor of the 1st Embodiment of this invention. It is the front view and top view of the automatic door sensor of FIG. It is a figure which shows the detection range (monitoring area) formed by the automatic door sensor of FIG. It is a block diagram of the automatic door sensor of FIG. It is a figure which shows the state which changed the detection range (monitoring area) with the automatic door sensor of FIG. It is a flowchart relevant to the light projection and light reception of the automatic door sensor of FIG. It is a flowchart relevant to the setting in the automatic door sensor of FIG. It is a figure which shows the setting state of the setting part in the automatic door sensor of FIG. It is the front view and top view of the automatic door sensor of the 2nd Embodiment of this invention. It is a figure which shows the detection range (monitoring area) formed by the automatic door sensor of FIG. It is a figure which shows the state which changed the detection range (monitoring area) with the automatic door sensor of FIG. It is the front view and top view of the automatic door sensor of the 3rd Embodiment of this invention. It is a figure which shows the detection range (monitoring area) formed by the automatic door sensor of FIG. It is the front view and top view of the automatic door sensor of the 4th Embodiment of this invention. It is a figure which shows the detection range (monitoring area) formed by the automatic door sensor of FIG. It is the front view and top view of the automatic door sensor of the 5th Embodiment of this invention. It is a figure which shows the detection range (monitoring area) formed by the automatic door sensor of FIG. It is the front view and top view of an automatic door sensor of a 6th embodiment of the present invention. It is a figure which shows the detection range (monitoring area) formed by the automatic door sensor of FIG. It is the front view and top view of an automatic door sensor of a 7th embodiment of the present 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 Controller

Claims (4)

A light projecting unit that circulates light to a plurality of monitoring areas in the vicinity of the door, and is provided corresponding to the plurality of light projectors that perform light projection and circulates the light. A light projecting unit comprising: an optical element that deflects light in the opening width direction of the door or in a direction orthogonal to the door opening width direction and projects the light to each of the plurality of monitoring areas ;
A light receiving unit comprising: a light receiver; and a multi-divided lens in which a plurality of lenses are combined and provided so as to collect corresponding light among the light projected onto the plurality of monitoring areas. When,
A control unit that compares the light reception signal of the light receiver with a predetermined threshold and determines the presence or absence of a person or an object in the monitoring area;
An automatic door sensor having a different number of light projectors and light receivers .   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.   3. The automatic door sensor according to claim 2, wherein a plurality of the projectors are provided in a direction orthogonal to the deflection direction.   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 light receiving portion is provided along a direction orthogonal to the door opening width direction. .

Images