Lighting method for preventing intrusion

Abstract

To keep a moving object such as an operator and a robot from entering an entry prohibited region in a simple way.SOLUTION: By emitting an outgoing beam (7) containing a predetermined wavelength in a visible range from one or more lighting devices (1) toward an entry prohibited target region (201) and by illuminating an entry prohibited explicit region (4) having an appropriately the same shape as the entry prohibited target region, including the entry prohibited target region, an entry is suppressed for an operator (5) by using a visual effect of a color within the entry prohibited explicit region, and for a robot (6), entry is suppressed (avoided) by using the wavelength of the outgoing beam.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a lighting method for preventing intrusion. [Background technology]

[0002] In various types of work, such as construction work, which is carried out indoors or outdoors, areas where workers and the like are prohibited from entering are sometimes set up. When a no-entry area is set up, it is generally surrounded by cone-shaped safety devices called color cones (registered trademark) or road cones, as well as bars or ropes that are strung between the color cones, to visually warn workers and the like that they are prohibited from entering.

[0003] As a related technique, for example, a technique is known in which an entry into a restricted area is monitored by recognizing an identification code attached to a worker or the like from an image captured within the restricted area (see, for example, Patent Document 1). Another related technique is known in which a light curtain is formed by a light-emitting unit and a light-receiving unit at the entrance to an area where a hazardous source such as a press machine is present, and when the light emitted from the light-emitting unit is no longer detected by the light-receiving unit, the operation of the hazardous source such as the press machine is forcibly stopped (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-4184 [Patent Document 2] Japanese Patent Application Laid-Open No. 2003-218679 Summary of the Invention [Problem to be solved by the invention]

[0005] However, at work sites such as construction sites where multiple tasks are carried out over a relatively large area, the no-entry zones are updated daily depending on the progress of the work. For this reason, while it is easy to designate no-entry zones using safety devices such as traffic cones, there is a problem in that the number of no-entry zones that can be designated depends on the length of the bars between the traffic cones. Furthermore, it is difficult to manage the state of the no-entry zones.

[0006] Furthermore, with the technology disclosed in Patent Document 1, the area in which entrants can be monitored is limited, and each time the no-entry zone is updated, it is necessary to change the camera's orientation and adjust the shooting area, which is time-consuming.Similarly, with the technology disclosed in Patent Document 2, it is necessary to change the position of the light curtain formed by the light-emitting unit and the light-receiving unit, etc., each time the no-entry zone is updated, which is time-consuming.

[0007] Furthermore, in recent years, autonomous or remotely controlled robots have been increasingly introduced to work sites. Since many of these types of robots follow predetermined routes, it is necessary to set the routes so that they avoid restricted areas, which is a time-consuming process.

[0008] In one aspect, the present invention aims to provide a technique that can prevent moving objects such as workers and robots from entering a no-entry zone in a simple manner. [Means for solving the problem]

[0009] A lighting method for preventing entry according to one embodiment includes irradiating an area to be prohibited from entry with emitted light having a predetermined wavelength in the visible range from one or more lighting devices, and illuminating an area marked with a no-entry sign that includes the area to be prohibited from entry and has substantially the same shape as the area to be prohibited from entry with the emitted light. and selecting the predetermined wavelength of the emitted light based on the state of the no-entry area. It is characterized by: [Effects of the Invention]

[0010] According to the above-described aspect, it is possible to prevent moving objects such as workers and robots from entering restricted areas in a simple manner. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a perspective view illustrating an example of the configuration of an intrusion prevention lighting system according to a first embodiment. [Figure 2] 1 is a block diagram illustrating an example of the configuration of a lighting device according to a first embodiment. [Figure 3] 10A and 10B are diagrams illustrating an example of a method for changing the irradiation range. [Figure 4] 10A and 10B are diagrams illustrating an example of a method for controlling a light-emitting element. [Figure 5] FIG. 10 is a perspective view illustrating an example of the configuration of an intrusion prevention lighting system according to a second embodiment. [Figure 6] FIG. 10 is a block diagram illustrating an example of the configuration of a lighting device according to a second embodiment. [Figure 7] 10 is a flowchart illustrating the operation of a lighting device according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0013] [First embodiment] Fig. 1 is a perspective view illustrating a configuration example of an intrusion prevention lighting system according to a first embodiment. Fig. 1 shows an example in which the intrusion prevention lighting system is applied to indicating no-entry areas at a construction site.

[0014] The entry prevention lighting system illustrated in Fig. 1 includes four lighting devices 1 (1A to 1D). The lighting devices 1A, 1B, 1C, and 1D are attached to color cones 3A, 3C, 3E, and 3G, respectively, which are located at the corners of the no-entry area 201, out of eight color cones 3 (3A to 3H) arranged to surround the rectangular no-entry area 201 set on the road surface 2. The no-entry area 201 is, for example, an area where concrete has been poured, and where entry (entry) of moving objects such as workers 5 and robots is prohibited.

[0015] Each lighting device 1A, 1B, 1C, and 1D is attached to a color cone 3A, 3C, 3E, and 3G in a manner that allows the emission direction of the emitted light 7 to be changed so that it can irradiate light of a predetermined wavelength in the visible range (e.g., red light with a wavelength of approximately 640 nm) toward the rectangular no-entry area 201.

[0016] In the anti-entry lighting system of this embodiment, the emission direction and illumination area of the emitted light 7 from each of the lighting devices 1A, 1B, 1C, and 1D are adjusted to illuminate the rectangular no-entry area 4 that includes the entire no-entry area 201. The no-entry area 4 is an area that explicitly notifies workers 5 and the like of the no-entry area 201 using light of a predetermined wavelength. In FIG. 1 , the no-entry area 4 includes a ring-shaped area that surrounds the no-entry area 201 and is not subject to no-entry restrictions, but part or all of the periphery of the no-entry area 4 may overlap with the no-entry area 201.

[0017] For example, if the no-entry area 201 is an area where concrete has been poured, workers 5 and others must be prohibited from entering (entering) the area until the concrete has sufficiently hardened. For this reason, at conventional construction sites, as illustrated in FIG. 1 , workers 5 and others are often prevented from entering the no-entry area 201 by bars stretched between color cones 3 to surround the no-entry area. However, the shape and extent of the area that can be designated by the color cones 3 and bars depend on the length of the bars stretched between the color cones 3. Therefore, with the conventional method using color cones 3 and bars, it is difficult to appropriately notify the shape and extent of the no-entry area 201, whose shape and extent (size) are not unique and may be updated depending on the situation. Furthermore, if the no-entry area 201 is notified to workers 5 only by safety devices such as color cones 3 and bars (i.e., without the no-entry area 4 being marked), it is difficult for them to visually recognize the condition within the no-entry area 201 (e.g., the progress of concrete hardening, etc.).

[0018] In contrast, when the entry prevention lighting system of this embodiment is applied, the no entry area 4, including the no entry area 201, can be illuminated with light of a color that calls attention or suggests danger (for example, red light). This makes it possible to prevent workers 5 from entering the no entry area 4.

[0019] Furthermore, when the no entry zone 4 is illuminated with light of a predetermined wavelength (for example, red light with a wavelength of approximately 640 nm), a light sensor (not shown) provided on the robot 6, such as an autonomous mobile robot, can detect the light of the predetermined wavelength from the forward area 601. This allows the robot 6 to change its travel route before entering the no entry zone 4, thereby preventing (restricting) the robot 6 from entering the no entry zone 4 (no entry zone 201).

[0020] In this way, the entry prevention lighting system of this embodiment can notify the shape, area, and conditions within the no-entry area 201 by using the shape, area, and color of the no-entry area 4, and can prevent the entry of workers 5, robots 6, etc. For this reason, when the entry prevention lighting system of this embodiment is applied, it is possible to omit the use of color cones 3B, 3D, 3F, and 3H that are not equipped with lighting devices 1A, 1B, 1C, and 1D as shown in FIG. 1, or bars that are hung between color cones 3.

[0021] FIG. 2 is a block diagram illustrating an example configuration of a lighting device according to the first embodiment. The lighting device 1 illustrated in FIG. 2 includes a control unit 101, a storage unit 102, an input unit 103, a display unit 104, a red LED (Light Emitting Diode) 105, a green LED 106, a blue LED 107, an LED driving unit 108, and an angle sensor 109. These components included in the lighting device 1 operate on power supplied from a power source (not shown) such as a battery or a commercial power source. The power source may have any known configuration, and may be one that employs wireless power supply technology, for example. For example, the power source may be a battery configured to be rechargeable by wireless power supply using a robot 6 that patrols the construction site.

[0022] Control unit 101 controls the overall operation of lighting device 1. Control unit 101 controls the light illumination range based on, for example, the angle (posture) of device 1 itself detected by angle sensor 109 and the correspondence information stored in memory unit 102. The correspondence information stored in memory unit 102 includes, for example, the correspondence relationship between the angle of device 1 itself and the light illumination range corresponding to no entry zone 4.

[0023] The input unit 103 includes, for example, a switch for turning the power on and off, a switch for setting the color of the emitted light, a switch for setting the brightness of the emitted light, etc. The display unit 104 includes, for example, an indicator lamp for visually notifying the state of the lighting device 1, etc.

[0024] The red LED 105, the green LED 106, and the blue LED 107 are examples of light-emitting elements that emit light to illuminate the no-entry zone 201. The light-emitting elements are not limited to the combination of the red LED 105, the green LED 106, and the blue LED 107, and can be changed as appropriate. The light-emitting elements in the lighting device 1 may be point light sources or surface light sources. The lighting device 1 may have a plurality of red LEDs 105, a plurality of green LEDs 106, and a plurality of blue LEDs 107, which may be arranged in a matrix. The LED driving unit 108 controls the current applied to the red LEDs 105, the green LEDs 106, and the blue LEDs 107, for example, based on the color and brightness of the light set by the input unit 103.

[0025] The lighting device 1 of this embodiment may include components other than those described above with reference to FIG. 2 (for example, an optical system for adjusting the shape and emission range of the emitted light 7).

[0026] Fig. 3 is a diagram illustrating an example of a method for changing the illumination range. Fig. 3(a) schematically shows an example of the illumination range of light in a plane including the normal direction (vertical direction) of the road surface 2, and Fig. 3(b) schematically shows an example of a method for changing the illumination range of light in a plane when the road surface 2 is viewed from above.

[0027] 3(a), the lighting device 1 of this embodiment is attached to the top of a traffic cone 3 placed on a road surface 2. In this case, the orientation of the lighting device 1 is adjusted so that the central direction 701 of the emitted light 7 is at a depression angle and the no-entry zone 201 on the road surface 2 is illuminated by the emitted light 7.

[0028] The shape of the illumination area when the road surface 2 is illuminated by the emitted light 7 is determined by the shape of the emitted light 7, the emission angles θ1 and θ2 at which the emitted light 7 is emitted from the lighting device 1, and the angle of incidence θ3 of the central direction 701 of the emitted light 7 on the road surface 2. For example, if the shape of the emitted light 7 is rectangular, the shape of the illumination area 401 on the road surface 2 will be trapezoidal, as shown in FIG. 3B. In this case, the emission angle θ2 in the horizontal plane may be less than 90 degrees, and the lighting device 1 may be installed at a corner of a rectangular no-entry zone 201, as shown in FIG. 1. In such a case, for example, as shown in FIG. 3B, the light emitted from the light-emitting element 110 (emitted light 7) is converted by the optical system 150 so that the emission angle θ2 in the horizontal plane becomes 90 degrees, and then emitted from the lighting device 1. This makes it possible to illuminate the rectangular no entry area 4, which includes the entire rectangular no entry area 201.

[0029] Furthermore, when the lighting device 1 is installed on a side of a rectangular no-entry area 201 (for example, traffic cone 3B in FIG. 1), the shape of the emitted light 7 may be corrected so that a trapezoidal illumination area 401 is converted into a rectangular illumination area 402, as shown in FIG. 3(b). Such correction of the shape of the emitted light 7 can be performed using a correction method well known in the field of optics, such as that described in JP 2001-339671 A.

[0030] Furthermore, although detailed description with reference to the drawings is omitted, the shape of the emitted light 7 may be circular or an oval such as an ellipse. The shape of the emitted light 7 is not limited to a specific shape and can be changed as appropriate based on the planar shape of the no-entry zone 201 and the number and arrangement of the lighting devices 1 (outgoing light 7) used to form the no-entry zone 4. The planar shape of the no-entry zone 201 is not limited to a quadrangle (square or rectangle) with four 90-degree corners as described above with reference to FIG. 1 etc., but may be another quadrangle with two or more corners that are not right angles, or may be a polygon other than a quadrangle. Furthermore, the planar shapes of the no-entry zone 201 and the no-entry zone 4 may have a curved periphery (for example, a circular arc) in part or in whole.

[0031] Furthermore, when lighting the no-entry area 201 using the lighting device 1, the light-emitting elements such as the red LED 105 described with reference to Figure 2 are not limited to being continuously lit (statically lit), but may also be lit intermittently (dynamically lit) by applying a pulse current.

[0032] Fig. 4 is a diagram illustrating an example of a method for controlling light-emitting elements. Fig. 4(a) shows an example of a pulse current when only a light-emitting element of a single color (e.g., red LED 105) is intermittently lit, and Fig. 4(b) shows an example of a pulse current when multiple light-emitting elements emitting different colors are intermittently lit.

[0033] When forming a no entry zone 4 using emitted light 7 from the lighting device 1, it is often preferable that the emitted light 7 be red light, which, as described above, is associated with caution or danger. When the emitted light 7 is red, the lighting device 1 applies a drive current only to the red LED 105 to cause it to emit light. In this case, the red LED 105 may be continuously lit (always lit), but if the lighting device 1 is battery-powered, the battery life can be extended by applying a pulse current 801, such as the one shown in FIG. 4(a), to cause it to light intermittently. The pulse width W1 and period of the pulse current 801 can be changed as appropriate.

[0034] 2, when the lighting device 1 has three light-emitting elements, a red LED 105, a green LED 106, and a blue LED 107, the color of the emitted light 7 that illuminates the no-entry zone 201 can be selected from a plurality of colors and switched. For example, the color of the emitted light 7 used to form the no-entry zone 4 can be changed depending on the state within the no-entry zone 201, the settings of moving objects that are prohibited from entering (for example, both the worker 5 and the robot 6, or only the worker 5), etc.

[0035] FIG. 4B shows pulse currents 802 and 803 for intermittently lighting red LED 105 and green LED 106 as an example of turning no entry zone 4 a color other than red. In this example, pulse current 802 applied to red LED 105 is "H" during the period when pulse current 803 applied to green LED 106 is "L," and pulse current 803 applied to green LED 106 is "H" during the period when pulse current 802 applied to red LED 105 is "L." That is, in the example shown in FIG. 4B, red LED 105 and green LED 106 alternately light up intermittently. Therefore, by adjusting pulse widths W2 and W3 of pulse currents 802 and 803 and pulse interval ΔW, the visual color of no entry zone 4 formed (illuminated) by emitted light 7 can be changed to yellow (orange), which is an additive mixture of red and green light. Furthermore, by changing the combination of the colors of the light (light-emitting elements) that are turned on intermittently, it is possible to form no entry zones 4 of even different colors. For example, if the lighting device 1 has a timer, the color of the no entry zone 4 may change as time passes from the start of lighting the no entry zone 201. In this way, for example, if an area where concrete has been poured is designated as a no entry zone, the time that has passed since the concrete was poured can be indicated by the change in light, and the condition of the concrete can be ascertained from the color of the no entry zone 4.

[0036] As described above, the entry prevention lighting system of this embodiment illuminates the no-entry area 201 to form the no-entry designated area 4, thereby visually informing the worker 5 of the location and extent of the no-entry area 201. This makes it possible to prevent the worker 5 from entering the no-entry area 201 without using safety devices such as colored cones 3 or bars. In particular, by clearly indicating the no-entry area 201 with visible light of a color that is different from the color of the road surface 2 that includes the no-entry area 201 and that is associated with caution or danger, it is possible to more effectively prevent the worker 5 from entering the no-entry area 201.

[0037] Furthermore, by emitting light containing light of a predetermined wavelength as the emitted light 7 that illuminates the no-entry area 201, a robot 6, such as an autonomous robot, can detect the light of the predetermined wavelength (no-entry area 4) ahead and change its driving route before entering the no-entry area 4.

[0038] Furthermore, when the no-entry area 201 to be notified is updated, the no-entry area 4 can be updated by a simple method such as changing the direction of the lighting device 1 or the irradiation range of the emitted light 7. Furthermore, the planar shape of the no-entry area 4 formed can be easily changed by changing the number and shape of the emitted light 7 that illuminate the no-entry area 201. Therefore, compared to conventional methods of preventing entry using safety devices such as color cones 3 and bars, it is possible to flexibly respond to updates (changes) in the planar shape of the no-entry area 201.

[0039] 1, the lighting device 1 in the entry prevention lighting system according to this embodiment may be installed at a higher location, for example, on a pole or tripod installed near the no-entry area 201. By installing the lighting device 1 at a higher location, the lighting range illuminated by one lighting device 1 can be widened, and therefore, for example, the number of lighting devices 1 used to illuminate a certain no-entry area 201 can be reduced, thereby suppressing increases in costs associated with the introduction and maintenance of the entry prevention lighting system.

[0040] Furthermore, the lighting device 1 according to this embodiment is not limited to the configuration described with reference to Fig. 2 and can be modified as appropriate. For example, as described above, the lighting device 1 may be a lighting device that includes only light-emitting elements of a single color and emits light 7 of a single color. In addition, the lighting device 1 may be a device that emits light 7 that includes visible light and invisible light.

[0041] Furthermore, the lighting device 1 may have, for example, a communication unit as described in the second embodiment with reference to FIG. 6, and may be capable of communicating with an information processing device such as a tablet computer or smartphone used by a worker 5 or the like. When the lighting device 1 capable of communicating with an information processing device is used, for example, the worker 5 or the like may be able to operate the information processing device to control the orientation of the lighting device 1, the color and shape of the emitted light 7, and the like. Furthermore, the lighting device 1 having a communication unit may communicate with, for example, a robot 6 that patrols a predetermined area such as a construction site where a no-entry zone 201 is set.

[0042] [Second embodiment] FIG. 5 is a perspective view illustrating an example of the configuration of an intrusion prevention lighting system according to the second embodiment.

[0043] 5 includes four lighting devices 1 (1A to 1D). The lighting devices 1A, 1B, 1C, and 1D are attached to color cones 3A, 3C, 3E, and 3G, respectively, which are placed at the corners of a rectangular no-entry area 201 set on a road surface 2.

[0044] The one or more lighting devices 1 included in the entry prevention lighting system of this embodiment have a function of measuring, for example, the temperature in a first measurement area 210 located within the entry-prohibited area 201 and the temperature in a second measurement area 211 located outside the entry-prohibited area 201. In the system illustrated in FIG. 5, one lighting device 1C of the four lighting devices 1A to 1D measures the temperatures in the first measurement area 210 and the second measurement area 211.

[0045] FIG. 6 is a block diagram illustrating an example configuration of a lighting device according to a second embodiment. A lighting device 1 having a temperature measurement function includes, for example, a control unit 101, a storage unit 102, an input unit 103, a display unit 104, a red LED 105, a green LED 106, a blue LED 107, an LED drive unit 108, and an angle sensor 109, as shown in FIG. 6. The lighting device 1 illustrated in FIG. 6 also includes an infrared sensor 111 and a communication unit 112. Similar to the lighting device 1 of the first embodiment described above with reference to FIG. 2, the lighting device 1 of this embodiment operates on power supplied from a power source (not shown), such as a battery or a commercial power source. The power source may have any known configuration, and may employ, for example, wireless power supply technology.

[0046] The control unit 101, memory unit 102, input unit 103, display unit 104, red LED 105, green LED 106, blue LED 107, LED drive unit 108, and angle sensor 109 each perform operations to implement the functions described in the first embodiment.

[0047] The infrared sensor 111 includes one or more infrared imaging elements and is used to measure the temperature in the first measurement area 210 and the temperature in the second measurement area 211. Therefore, the control unit 101 performs an operation to control the color of the emitted light 7 based on the temperature measurement result by the infrared sensor 111, in addition to the operation to implement the functions described in the first embodiment.

[0048] The communication unit 112 performs wireless communication with, for example, other lighting devices 1 and information processing devices 9 such as tablet computers and smartphones in accordance with wireless communication standards such as Wi-Fi (registered trademark), Bluetooth (registered trademark), and Bluetooth Low Energy (registered trademark). The communication unit 112 can also be used for wireless communication with, for example, the robot 6.

[0049] The lighting device 1 of this embodiment may include components other than those described above with reference to FIG. 6 (for example, an optical system for adjusting the shape and emission range of the emitted light 7).

[0050] FIG. 7 is a flowchart illustrating the operation of the lighting device according to the second embodiment.

[0051] When the lighting device 1 of this embodiment is turned on, it starts emitting light in a default color (step S101), and starts measuring and recording the temperature (step S102). In step S102, the lighting device 1 (for example, the lighting device 1C in FIG. 5) uses the infrared sensor 111 to measure the temperature in the first measurement area 210 and the temperature in the second measurement area 211, and starts a process of storing information about the measured temperatures in the memory unit 102.

[0052] Thereafter, the lighting device 1 determines whether or not it is time to check whether the emitted color (the color of the emitted light 7) is appropriate (step S103). The lighting device 1 determines whether or not the time to check has arrived by, for example, operating a timer not shown in Fig. 6. If the time to check has not arrived (step S103; NO), the lighting device 1 maintains the emitted color at that time and repeats the determination of step S103.

[0053] If the timing for checking has arrived (step S103; YES), the lighting device 1 then determines whether the color of the emitted light 7 corresponds to a current evaluated temperature based on the temperatures in the first measurement area 210 and the second measurement area 211 (step S104). The current evaluated temperature is, for example, a value obtained by subtracting the temperature of the second measurement area 211 from the temperature in the first measurement area 210. The control unit 101 of the lighting device 1 calculates the current evaluated temperature and determines whether the emitted color corresponds to the current evaluated temperature based on information indicating the correspondence between the evaluated temperature and the emitted color stored in the storage unit 102 and the emitted color of the current emitted light 7. If the emitted color corresponds to the current evaluated temperature (step S104; YES), the lighting device 1 maintains the emitted color at that time and returns to the determination in step S103.

[0054] On the other hand, if the emitted light color is not a corresponding one (step S104; NO), the lighting device 1 changes the emitted light color (step S105) and returns to the determination of step S103. In step S105, the control unit 101 of the lighting device 1 identifies the light-emitting element to which the pulse current is applied based on the information indicating the correspondence between the evaluated temperature and the emitted light color stored in the storage unit 102, and causes the LED driving unit 108 to drive the light-emitting element (e.g., one or more of the red LED 105, the green LED 106, and the blue LED 107). If steps S102 to S104 are performed by only one lighting device 1 out of the multiple lighting devices 1, that lighting device 1 transmits information indicating the emitted color of the emitted light 7 to the other lighting devices 1 via the communication unit 112 in step S105. In this case, the other lighting devices 1 that do not perform steps S102 to S104 change the emitted color of the emitted light 7 of their own devices in accordance with the information indicating the emitted color of the emitted light 7 received via the communication unit 112. After step S105, the lighting device 1 returns to the determination in step S103.

[0055] Here, a specific example of the determination in step S104 and the processing in step S105 will be described. For example, when concrete is poured within the no-entry area 201, the temperature of the poured concrete rises once, then drops, and finally becomes approximately the same as the temperature outside the no-entry area 201. Such a change in the temperature of the poured concrete is related to the progress of hardening of the concrete. For this reason, by determining the progress of hardening of the concrete within the no-entry area 201 based on the temperature of the poured concrete, it is possible to change the type of moving object (including a worker) that is prohibited from entering.

[0056] For example, immediately after pouring, concrete has not yet started to harden, and therefore, even if a lightweight moving object such as a robot 6 enters the no-entry zone 201, the shape of the surface will be deformed. For this reason, if it is determined that the concrete has not sufficiently hardened based on the temperatures in the first measurement area 210 and the second measurement area 211, the no-entry zone 201 is illuminated with emitted light 7 (e.g., red light with a wavelength of approximately 640 nm) of a color indicating that entry is prohibited for all moving objects, including lightweight moving objects such as a robot 6. In this case, since the no-entry zone 4 is red, the worker 5 can visually recognize that the concrete has not yet hardened and therefore must not enter the no-entry zone 201. Furthermore, a robot 6 such as an autonomous mobile robot can also detect, using an optical sensor, the presence of a no-entry zone 4 ahead illuminated with red light with a wavelength of approximately 640 nm, and can change its traveling route before entering the no-entry zone 4.

[0057] Furthermore, for example, if it is determined based on the temperatures in the first measurement area 210 and the second measurement area 211 that the concrete has hardened to the extent that the surface shape will not be deformed if a lightweight moving object such as a robot 6 enters the no-entry area 201, the no-entry area 201 is irradiated with emitted light 7 (for example, yellow (orange) light) of a color indicating that the robot 6 is permitted to enter. In this case, the worker 5 can visually recognize that although the concrete is hardening, it is still prohibited from entering the no-entry area 201 because the no-entry area 4 is yellow (orange). Furthermore, the robot 6 determines whether or not entry into the no-entry area 4 is permitted based on, for example, the wavelength component of light detected by an optical sensor, and if not permitted, can determine the travel route before entering.

[0058] Furthermore, when the emitted color (the color of the emitted light 7) is changed based on the temperature in the first measurement area 210 and the temperature in the second measurement area 211, for example, by using more emitted colors, it is possible to visually grasp whether the concrete is hardening appropriately.

[0059] As described above, the entry prevention lighting system of this embodiment illuminates the no entry area 201 to form the no entry area 4, thereby visually notifying the worker 5 of the location and extent of the no entry area 201. Furthermore, when the no entry area 201 to be notified is updated, the no entry area 4 can be updated by a simple method such as changing the orientation of the lighting device 1 or the irradiation range of the emitted light 7. Furthermore, because the planar shape of the formed no entry area 4 can be easily changed by changing the number and shape of the emitted light 7 that illuminate the no entry area 201, updating (changing) the planar shape of the no entry area 201 can also be flexibly accommodated.

[0060] Furthermore, by emitting light containing light of a predetermined wavelength as the emitted light 7 that illuminates the no-entry area 201, a robot 6, such as an autonomous robot, can detect the light of the predetermined wavelength (no-entry area 4) ahead and change its driving route before entering the no-entry area 4.

[0061] Furthermore, by controlling the color of the emitted light 7 based on the temperature inside the no-entry zone 201 and the temperature outside the no-entry zone 201, the state inside the no-entry zone 201 can be visually recognized easily. In the above-described embodiment, an example is shown in which the progress of concrete hardening is determined (estimated) based on the temperature measured by the infrared sensor 111 and the color of the emitted light 7 is changed, but information on the measured temperature may also be used to determine (estimate) another state inside the no-entry zone 201. Furthermore, the information used to determine the state inside the no-entry zone 201 is not limited to temperature, and other information may also be used. For example, a different use of the infrared sensor 111 is to measure the moisture content using the spectral reflectance of the infrared wavelength band and control the color of the emitted light 7 according to the moisture content.

[0062] In addition, the function of acquiring information indicating the status within the no-entry area 201, such as the infrared sensor 111 illustrated in FIG. 6, may be provided in a sensor device separate from the lighting device 1 and connected to the lighting device 1.

[0063] Furthermore, if the lighting device 1 is capable of communicating with an information processing device 9 such as a tablet computer or a smartphone, it may be possible to transfer, for example, information such as temperature measured by the lighting device 1 to the information processing device 9. In such a configuration, for example, a worker operating the information processing device 9 may determine the condition inside the no-entry zone 201 based on information such as temperature obtained from the lighting device 1, and transmit information specifying the color of the emitted light 7 to the lighting device 1.

[0064] Note that the intrusion prevention lighting method of this embodiment may be configured such that, for example, all lighting devices 1 have infrared sensors 111 as illustrated in Fig. 6, and two or more lighting devices 1 individually control the color of the emitted light 7 based on temperature information measured by the infrared sensors 111. For example, if a no-entry zone 201 designated as a single zone is relatively large, the single no-entry zone 201 may be divided into multiple small zones, and the color of the emitted light 7 may be controlled for each small zone based on temperature information measured by the infrared sensor 111.

[0065] The above-described embodiment is a specific example for facilitating understanding of the invention, and the present invention is not limited to the above-described embodiment. The no-entry area 201 to which the intrusion prevention lighting system of the present invention can be applied is not limited to an area covered with poured concrete as described above. The configuration, functions, and operations of the lighting device 1, as well as the intrusion prevention lighting method using the lighting device 1, can be modified and changed in various ways without departing from the scope of the claims. For example, the control unit 101, memory unit 102, etc. of the lighting device 1 may be configured with dedicated hardware for performing the above-described functions, or may be configured with a general-purpose computer and a program executed by the computer. [Explanation of symbols]

[0066] 1. 1A~1D Lighting equipment 101 Control section 102 Storage section 103 Input section 104 Display section 105 red LED 106 green LED 107 Blue LED 108 LED driver 109 Angle Sensor 110 Light-emitting element 111 Infrared sensor 112 Communications Department 150 Optical system 2 Road surface 201 Prohibited area 3, 3A~3G Traffic cones 4 Clear prohibited entry area 401, 402 lighting area 5. Workers 6. Robot 7. Emitted light 701 Center direction of emitted light 801, 802, 803 Pulse current 9. Information processing equipment

Claims

1. When one or more lighting devices emit light having a predetermined wavelength in the visible range toward a no-entry target area, and the emitted light illuminates a no-entry marked area having substantially the same shape as the no-entry target area and including the no-entry target area, The predetermined wavelength of the emitted light is selected based on the state of the no-entry area. A lighting method for preventing intrusion.

2. A lighting method for preventing intrusion as described in Claim 1, characterized in that the selected predetermined wavelength of the emitted light includes a wavelength within the wavelength range of red light.

3. 3. The lighting method for preventing entry according to claim 1, wherein the predetermined wavelength of the emitted light is further selected based on the type of moving object that is prohibited from entering the no-entry area.

4. 4. The lighting method for preventing entry according to claim 1, further comprising detecting a state within the no-entry area using a detection device, and changing a color of the emitted light based on the detected state within the no-entry area.

5. When the state of the no-entry target area detected by the detection device is a first state, irradiating the no-entry target area with emitted light of a wavelength that prohibits a first type of moving object and a second type of moving object that is not included in the first type from entering the no-entry target area, when the state in the no-entry target area detected by the detection device is a second state, irradiating the no-entry target area with emitted light of a wavelength that prohibits the first type of moving object from entering the no-entry target area and allows the second type of moving object to enter the no-entry target area.

5. The lighting method for preventing intrusion according to claim 4.

6. 6. The lighting method for preventing entry as claimed in claim 4 or 5, wherein the detection device detects the temperature at least within the no-entry area, and the color of the emitted light is changed based on the detected temperature.

7. The intrusion prevention lighting method according to any one of claims 4 to 6, characterized in that an information processing device capable of communicating with the lighting device and the detection device acquires the state of the no-entry area detected by the detection device, and information specifying the color of emitted light corresponding to the acquired state of the no-entry area is transmitted from the information processing device to the lighting device.

8. The intrusion prevention lighting method according to any one of claims 1 to 7, wherein the lighting device applies a pulse current to an LED (Light Emitting Diode) to emit light including the predetermined wavelength.

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