Luminaire

Abstract

To provide a luminaire which has high safety even in the case where a cover is not mounted on a case, and which can brightly light a site where maintenance is performed.SOLUTION: A luminaire includes: a light emitting element for emitting light which has brightness according to supplied power; a supply unit for supplying power; a blower unit for blowing air to the supply unit; a temperature detection unit for detecting the temperature of the supply unit; a case for storing the light emitting element, the supply unit, the blower unit and the temperature detection unit; a cover which can be attached to / detached from the case; a detection unit for detecting whether or not the cover is mounted on the case; and a control unit which, during a non-mounting period in which it is determined that the cover is not mounted on the case by the detection unit, stops the air blowing by the blower unit, and which allows the supply unit to suppress brightness as the temperature becomes higher.SELECTED DRAWING: Figure 12

Description

[Technical field]

[0001] The present disclosure relates to a lighting device. [Background technology]

[0002] Patent Document 1 discloses a downlight. In this downlight, a light-transmitting cover covers the lower end surface of a cylindrical body. When the temperature of the downlight rises, the light-transmitting cover comes off the cylindrical body. This allows heat trapped inside the cylindrical body to dissipate from the open portion. This suppresses the temperature of the cylindrical body and its interior (paragraphs 0019, 0031, 0033 and 0034). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4858330 Summary of the Invention [Problem to be solved by the invention]

[0004] It is conceivable to provide a blower for blowing air to suppress the temperature inside the cylindrical body of the downlight disclosed in Patent Document 1 inside the cylindrical body. However, if the blower is operated while the translucent cover body is removed from the cylindrical body for maintenance, a worker may touch the blower, which may cause a safety problem. Also, if the blower is stopped while the translucent cover body is removed from the cylindrical body for maintenance, the temperature inside the cylindrical body may rise, causing the downlight to break down. Also, if the lamp is turned off to avoid the temperature inside the cylindrical body rising while the translucent cover body is removed from the cylindrical body for maintenance, the work site where the maintenance is performed may become dark, which may cause problems with the maintenance.

[0005] One aspect of the present disclosure has been made in consideration of these problems. An object of one aspect of the present disclosure is to provide a lighting device that is highly safe and can illuminate a site where maintenance or the like is performed, even when a cover is not attached to a case for maintenance or the like. [Means for solving the problem]

[0006] An illumination device according to one aspect of the present disclosure includes a light-emitting element that emits light having a brightness according to the power supplied thereto, a supply unit that supplies the power, a blower unit that blows air that hits the supply unit, a temperature detection unit that detects the temperature of the supply unit, a case that houses the light-emitting element, the supply unit, the blower unit, and the temperature detection unit, a cover that can be attached and detached to the case, a detection unit that detects whether the cover is attached to the case, and a control unit that stops the blower unit from blowing the air during a period when the detection unit detects that the cover is not attached to the case, and causes the supply unit to reduce the brightness as the temperature increases. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a perspective view illustrating a schematic view of a lighting device according to a first embodiment. [Diagram 2] FIG. 1 is a perspective view illustrating a state in which a lighting device according to a first embodiment is attached to a ceiling. [Diagram 3] FIG. 1 is a cross-sectional view illustrating a schematic view of a lighting device according to a first embodiment. [Figure 4] 1 is a cross-sectional view illustrating a schematic state in which a lighting device according to a first embodiment is attached to a ceiling. [Diagram 5] FIG. 1 is an exploded perspective view illustrating a lighting device according to a first embodiment. [Figure 6] FIG. 1 is an exploded perspective view illustrating a lighting device according to a first embodiment. [Figure 7] FIG. 2 is a block diagram of a control system of the lighting device according to the first embodiment. [Figure 8]5 is a flowchart showing a flow of control performed by a control unit provided in the lighting device of the first embodiment. [Figure 9] 5 is a flowchart showing a flow of control for normal operation performed by a control unit included in the lighting device of the first embodiment. [Figure 10] 5 is a flowchart showing a flow of control for normal operation performed by a control unit included in the lighting device of the first embodiment. [Figure 11] 4 is a table showing an example of a first control and a second control for eliminating an abnormal state, which are performed by a control unit included in the lighting device of the first embodiment. [Figure 12] 5 is a flowchart showing a flow of control for maintenance operation performed by a control unit included in the lighting device of the first embodiment. [Figure 13] 5 is a flowchart showing a flow of temperature-dependent brightness control performed by a control unit included in the lighting device of the first embodiment. [Figure 14] 1 is a table showing a relationship between a temperature detected by a temperature detection unit provided in the lighting device and an initial brightness of light emitted by a plurality of light-emitting elements provided in the lighting device of the first embodiment, when the brightness is controlled according to temperature by a control unit provided in the lighting device. [Figure 15] 1 is a table showing a relationship between a change in temperature detected by a temperature detection unit provided in the lighting device of the first embodiment and the brightness of light emitted by a plurality of light-emitting elements provided in the lighting device before and after the change, when brightness is controlled according to temperature by a control unit provided in the lighting device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the drawings, the same or equivalent elements are denoted by the same reference numerals, and duplicated descriptions will be omitted.

[0009] 1. First embodiment 1.1 Appearance of the lighting device Fig. 1 is a perspective view that typically illustrates the lighting device of the first embodiment. Fig. 2 is a perspective view that typically illustrates the lighting device of the first embodiment attached to a ceiling. Fig. 3 is a cross-sectional view that typically illustrates the lighting device of the first embodiment. Fig. 4 is a cross-sectional view that typically illustrates the lighting device of the first embodiment attached to a ceiling.

[0010] The lighting device 1 of the first embodiment shown in Fig. 1 to Fig. 4 is a downlight embedded in a ceiling 11 to illuminate downward. The lighting device 1 has an ion generating function that generates ions in the air. The lighting device 1 may have an air conditioning function other than the ion generating function. For example, the lighting device 1 may have a purification function that purifies the air, a heating function that heats the air, a cooling function that cools the air, a humidifying function that humidifies the air, a dehumidifying function that dehumidifies the air, etc.

[0011] The ceiling 11 to which the lighting device 1 is attached is the ceiling of a room such as an office, a hallway, a toilet, or the like.

[0012] As shown in FIGS. 1 to 4, the lighting device 1 includes a buried portion 21 and an exposed portion 22. As shown in FIG.

[0013] A hole 11a is formed in the ceiling 11 in which the lighting device 1 is embedded. The hole 11a has a circular planar shape.

[0014] The embedded part 21 has a cylindrical outer shape, a diameter that fits the diameter of the hole 11a of the ceiling 11, and a large height. The embedded part 21 is inserted into the hole 11a, disposed above the ceiling surface 11b of the ceiling 11, and embedded in the ceiling 11.

[0015] The exposed portion 22 has an outer shape of an inverted truncated cone and has only a small height. The embedded portion 21 is connected to the upper end of the exposed portion 22. The upper end of the exposed portion 22 has a diameter larger than the diameter of the hole 11a of the ceiling 11. Therefore, even if the embedded portion 21 is inserted into the hole 11a, the exposed portion 22 is not inserted into the hole 11a, and is disposed below the ceiling surface 11b of the ceiling 11 and exposed below the ceiling 11.

[0016] In the lighting device 1, only the exposed portion 22, which has a small height, protrudes downward from the ceiling surface 11b of the ceiling 11, and the embedded portion 21, which has a large height, does not protrude downward from the ceiling surface 11b. This makes it possible to prevent a large-sized structure from protruding downward from the ceiling surface 11b. This makes it possible to improve the appearance of the lighting device 1.

[0017] Furthermore, in the lighting device 1, the main part of the mechanism for imparting an ion generating function to the lighting device 1 can be built into the embedded part 21, which has a large height but is invisible to the user. This allows the ion generating function to be imparted to the lighting device 1 without compromising the compactness of the exposed part 22, which is visible to the user.

[0018] An outlet 22i and an exhaust outlet 22j are formed on the lower surface 22a of the exposed portion 22. A plurality of intake ports 22k are formed on the side surface 22b of the exposed portion 22. The intake ports 22k are arranged in the circumferential direction. The lighting device 1 emits light that illuminates the downward direction from the outlet 22i. The lighting device 1 takes in air through the intake port 22k and exhausts the air from the exhaust port 22j.

[0019] 1.2 Internal structure of the lighting device As shown in Figures 1 to 4, the lighting device 1 includes a case 31, a cover 32, a plurality of light-emitting elements 33, a supply unit 34, a temperature detection unit 35, a blower unit 36, a detection unit 37, a human detection unit 38, an ion generation unit 39 and a control unit 40.

[0020] Case 31 accommodates light emitting element 33, supply unit 34, temperature detection unit 35, air blower 36, detection unit 37, human detection unit 38, ion generation unit 39, and control unit 40. Case 31 is formed with air outlet 22i, air intake 22k, and opening 31a.

[0021] The cover 32 can be attached to and detached from the case 31. When the cover 32 is attached to the case 31, the cover 32 closes the opening 31a. The cover 32 has an exhaust port 22j formed therein.

[0022] As shown in FIG. 4, the cover 32 is provided with a magnet 51 .

[0023] An air passage 31b is formed inside a housing formed by the case 31 and the cover 32. The air passage 31b leads from the air intake port 22k to the air exhaust port 22j, and guides air from the air intake port 22k to the air exhaust port 22j.

[0024] The light-emitting element 33 emits light that illuminates downward toward the light outlet 22i. This causes the lighting device 1 to emit light that illuminates downward from the light outlet 22i. The light-emitting element 33 emits light having a brightness according to the supplied power.

[0025] The supply unit 34 supplies power to the light-emitting element 33. This causes the light-emitting element 33 to emit light. The supply unit 34 changes the brightness of the light emitted by the light-emitting element 33 by changing the power supplied to the light-emitting element 33. The supply unit 34 controls the brightness of the light by pulse width modulation (PWM) control, linear control, or the like. The supply unit 34 generates heat when supplying power to the light-emitting element 33. The supply unit 34 is disposed in the air passage 31b of the housing. This allows the supply unit 34 to be exposed to the wind guided by the air passage 31b and to be cooled by the exposed wind.

[0026] The temperature detection unit 35 detects the temperature of the supply unit 34 .

[0027] The light emitting element 33, the supply unit 34, and the temperature detection unit 35 are provided on the light emitting element substrate. The supply unit 34 is a substrate body provided with a printed circuit board and electronic components mounted on the printed circuit board. The pattern provided on the printed circuit board and the electronic components electrically connected by the pattern constitute an electronic circuit that drives the light emitting element 33. The light emitting element 33 is a light emitting diode (LED). Therefore, the light emitting element substrate is an LED substrate. When the light emitting element 33 is an LED, the power consumed by the light emitting element 33 can be reduced, and the life of the light emitting element 33 can be extended. However, the light emitting element 33 may be a light emitting element other than an LED. For example, the light emitting element 33 may be an incandescent light bulb, a fluorescent lamp, or the like. The light emitting element 33 is mounted on one main surface of the supply unit 34, which is a substrate body. As a result, the light emitting element 33 is supported by the supply unit 34 and is electrically connected to the supply unit 34. The temperature detection unit 35 is a thermistor. However, the temperature detection unit 35 may be a temperature detection element other than a thermistor. For example, the temperature detection unit 35 may be a resistance temperature detector, a thermocouple, etc. The temperature detection unit 35 is mounted on one main surface of the supply unit 34, which is the board body. As a result, the temperature detection unit 35 is supported by the supply unit 34 and electrically connected to the supply unit 34.

[0028] The blower 36 is disposed in air passage 31b of the housing. The blower 36 draws in air from an upstream section of air passage 31b and blows the drawn-in air to a downstream section of air passage 31b. In this way, the blower 36 blows wind guided by air passage 31b, and blows wind from intake port 22k through air passage 31b toward exhaust port 22j. The blower 36 includes a sirocco fan and a fan motor. The sirocco fan rotates to blow air. The fan motor rotates the sirocco fan. The blower 36 may include a fan other than the sirocco fan.

[0029] The detection unit 37 detects whether the cover 32 is attached to the case 31. The detection unit 37 is a magnetic sensor 81. The detection unit 37 is disposed at a position close to a position where the magnet 51 is disposed when the cover 32 is attached to the case 31. As a result, the detection unit 37 detects the magnetism generated by the magnet 51 when the cover 32 is attached to the case 31, and does not detect the magnetism generated by the magnet 51 when the cover 32 is detached from the case 31. As a result, the detection unit 37 detects whether the cover 32 is attached to the case 31 based on whether the detection unit 37 detects the magnetism generated by the magnet 51. The detection unit 37 may be a detection element other than the magnetic sensor 81. For example, the detection unit 37 may be a mechanical switch. When the detection unit 37 is a mechanical switch, the cover 32 includes an action unit that acts on the mechanical switch when the cover 32 is attached to the case 31. As a result, the detection unit 37 is acted upon by the acting portion when the cover 32 is attached to the case 31, and is not acted upon by the acting portion when the cover 32 is detached from the case 31. As a result, the detection unit 37 detects whether or not the cover 32 is attached to the case 31 depending on whether or not it is acted upon by the acting portion. The acting portion is a protrusion or the like.

[0030] The human detection unit 38 detects whether or not a person is present near the lighting device 1. The human detection unit 38 is an infrared human sensor. Thereby, when a person is present near the lighting device 1, the human detection unit 38 detects infrared rays emitted by the person, and when a person is not present near the lighting device 1, the human detection unit 38 does not detect infrared rays emitted by the person. Thereby, the human detection unit 38 detects whether or not a person is present near the lighting device 1 based on whether or not it detects infrared rays emitted by the person. The human detection unit 38 may be a human detection element other than an infrared sensor. For example, the human detection unit 38 may be an image human detection sensor.

[0031] The ion generating unit 39 can be attached to and detached from the case 31. When the ion generating unit 39 is attached to the case 31, it is disposed in the air passage 31b of the housing. The ion generating unit 39 is disposed in the air passage 31b at a position closer to the exhaust port 22j of the exposed portion 22 than the position where the blower 36 is disposed. The ion generating unit 39 generates ions in the air blown by the wind guided by the air passage 31b. The generated ions are carried to the outside of the case 31 by the wind guided by the air passage 31b. As a result, the air containing the ions is released over a wide area from the exhaust port 22j. The ion generating unit 39 includes a power source and electrodes. The power source generates a high voltage and applies the generated high voltage to the electrodes. The electrodes generate discharge in the air blown by the wind guided by the air passage 31b by the applied voltage, thereby generating ions in the air.

[0032] The control unit 40 controls the entire lighting device 1. The control unit 40 includes a microcontroller and peripheral circuits. The microcontroller includes a processor and a memory. The processor executes a control program stored in the memory to operate the microcontroller and the peripheral circuits as the control unit 40. All or part of the processing performed by the microcontroller may be performed by a dedicated electronic circuit.

[0033] 1.3 Attaching and detaching the cover and ion generator to the main body 5 and 6 are exploded perspective views each showing a schematic diagram of the lighting device according to the first embodiment.

[0034] 5 and 6, the lighting device 1 includes a main body 71, a cover 32, and an ion generating unit 39. The main body 71 includes a plurality of light-emitting elements 33, a supply unit 34, a temperature detecting unit 35, a blower unit 36, a detecting unit 37, a human detecting unit 38, an ion generating unit 39, and a control unit 40.

[0035] The main body 71 has a first internal space 71a and a second internal space 71b formed therein.

[0036] The cover 32 has a shape that fits the shape of the first internal space 71a of the main body 71. Therefore, the first internal space 71a can accommodate the cover 32. The main body 71 holds the cover 32 in a state in which the cover 32 is accommodated in the first internal space 71a. The cover 32 is attached to and detached from the main body 71, and is inserted into and removed from the first internal space 71a.

[0037] The ion generating unit 39 has a shape that fits the shape of the second internal space 71b of the main body 71. Therefore, the second internal space 71b can accommodate the ion generating unit 39. The main body 71 holds the ion generating unit 39 in a state in which the ion generating unit 39 is accommodated in the second internal space 71b. The ion generating unit 39 is detached from the main body 71 and inserted into and removed from the second internal space 71b in a state in which the cover 32 is detached from the main body 71 and removed from the first internal space 71a of the main body 71. Therefore, the old ion generating unit 39 can be replaced with a new ion generating unit 39 by detaching the cover 32 from the main body 71 and removing it from the first internal space 71a, detaching the old ion generating unit 39 from the main body 71 and removing it from the second internal space 71b, inserting a new ion generating unit 39 into the second internal space 71b and attaching it to the main body 71, and inserting the cover 32 into the first internal space 71a and attaching it to the main body 71.

[0038] The first internal space 71a and the second internal space 71b of the main body 71 are exposed to the outside of the main body 71 through the opening 31a of the case 31. When the cover 32 is inserted into the first internal space 71a and attached to the main body 71, the cover 32 closes the opening 31a. Therefore, when the cover 32 is inserted into the first internal space 71a and attached to the main body 71, the cover 32 prevents the user's fingers, etc. from entering the first internal space 71a and the second internal space 71b, and prevents the user's fingers, etc. from touching the ion generating unit 39. As a result, the cover 32 prevents the user from touching the high voltage portion of the ion generating unit 39. Furthermore, when the cover 32 is inserted into the first internal space 71a and attached to the main body 71, the cover 32 prevents the user's fingers, etc. from touching the blower unit 36 ​​arranged in the third internal space located deeper than the first internal space 71a and the second internal space 71b. In this way, the cover 32 prevents a user from touching the high voltage portion and the moving portion of the blower 36. This makes it possible to improve the safety of the lighting device 1.

[0039] The cover 32 is detached from the main body 71 when maintenance or the like is performed on the lighting device 1. The maintenance to be performed includes replacing the old ion generating unit 39 with a new ion generating unit 39, cleaning the air filter housed in the main body 71, and the like.

[0040] 1.4 Lighting device control system FIG. 7 is a block diagram of a control system of the lighting device according to the first embodiment.

[0041] As shown in FIG. 7, the control unit 40 acquires the detection results of the temperature detection unit 35, the detection unit 37, and the human detection unit 38, and controls the supply unit 34, the blower unit 36, and the ion generation unit 39 based on the acquired detection results.

[0042] The control unit 40 causes the supply unit 34 to turn on and off the light-emitting element 33. The control unit 40 causes the supply unit 34 to reduce the brightness of the light emitted by the light-emitting element 33 as the temperature detected by the temperature detection unit 35 becomes higher. This makes it possible to increase the brightness of the light emitted by the light-emitting element 33 when the temperature of the supply unit 34 is low. Furthermore, when the temperature of the supply unit 34 is high, it is possible to reduce the heat emitted by the supply unit 34, thereby preventing the temperature of the supply unit 34 from becoming too high.

[0043] During the non-attachment period in which the detection unit 37 detects that the cover 32 is not attached to the case 31, the control unit 40 causes the air blower unit 36 ​​to stop blowing air. The control unit 40 stops the supply of power to the air blower unit 36, thereby causing the air blower unit 36 ​​to stop blowing air. This eliminates the high-voltage parts and moving parts of the air blower unit 36, and the user will not come into contact with the high-voltage parts and moving parts of the air blower unit 36. This makes it possible to provide a lighting device 1 that is highly safe.

[0044] On the other hand, the control unit 40 causes the blower 36 to blow air during the attachment period in which the detector 37 detects that the cover 32 is attached to the case 31. This makes it possible to cool the supply unit 34 that generates heat.

[0045] The control unit 40 causes the supply unit 34 to turn on the light-emitting element 33 during both the non-wearing period and the wearing period. The control unit 40 causes the supply unit 34 to reduce the brightness of the light emitted by the light-emitting element 33 as the temperature detected by the temperature detection unit 35 becomes higher during both the non-wearing period and the wearing period.

[0046] Consider a case where the blower 36 stops blowing air and the supply unit 34 dimly lights the light-emitting element 33 during the non-wearing period. In this case, the user will not come into contact with the high-voltage portion and moving portion of the blower 36. Also, the brightness of the light emitted by the light-emitting element 33 is only the brightness during dim lighting, for example, about 10% of the maximum brightness. Therefore, even though no air is blown to cool the supply unit 34, it is possible to prevent the temperature of the supply unit 34 from becoming too high and causing the supply unit 34 to break down. However, it is not possible to brighten the work site where maintenance is being performed so that the work can be performed comfortably.

[0047] In contrast, consider a case where, during the non-wearing period, the blower 36 stops blowing air, and the supply unit 34 dims the brightness of the light emitted by the light-emitting element 33 as the temperature of the supply unit 34 increases. In this case, the user will not come into contact with the high-voltage portion and the moving portion of the blower 36. In addition, the brightness of the light emitted by the light-emitting element 33 becomes dim before the temperature of the supply unit 34 becomes too high. Therefore, even if air is not blown to cool the supply unit 34, it is possible to prevent the temperature of the supply unit 34 from becoming too high and causing the supply unit 34 to break down. In addition, the brightness of the light emitted by the light-emitting element 33 can be brighter than the brightness when it is dimmed, for example, about 10% of the maximum brightness, as long as the temperature of the supply unit 34 is not too high. Therefore, the work site where maintenance is performed can be bright enough to allow comfortable work.

[0048] The control unit 40 causes the supply unit 34 to suppress the brightness of the light emitted by the light-emitting element 33 during the non-wearing period more strongly than the suppression of the brightness of the light emitted by the light-emitting element 33 during the wearing period. This makes it possible to suppress the temperature of the supply unit 34 from becoming too high due to the supply unit 34 not being cooled by the wind sent by the blower unit 36 ​​during the non-wearing period.

[0049] When the presence of a person is detected by the human detection unit 38 during the wearing period, the control unit 40 controls the blower unit 36 ​​to reduce the volume of the air being blown and controls the supply unit 34 to turn on the light emitting element 33. This makes it possible to prevent the person present from being exposed to the sound emitted by the blower unit 36. This makes it possible to prevent the person present from feeling annoyed. It is also possible to provide brightness to the person present.

[0050] When the human detection unit 38 detects that no person is present during the wearing period, the control unit 40 controls the blower unit 36 ​​to increase the volume of air to be blown and the supply unit 34 to turn off the light-emitting element 33. This allows ions to be emitted far away when the people present do not feel annoyed. Also, when it is not necessary to provide brightness to the people present, the power consumed by the light-emitting element 33 can be reduced.

[0051] 1.5 Control FIG. 8 is a flowchart showing a flow of control performed by a control unit provided in the lighting device of the first embodiment.

[0052] The control unit 40 executes steps S101 to S103 shown in FIG.

[0053] In step S101, the control unit 40 determines whether or not the detection unit 37 has detected that the cover 32 is attached to the case 31. If the control unit 40 determines that the cover 32 is attached to the case 31, it executes step S102 and then executes step S101 again. If the control unit 40 determines that the cover 32 is not attached to the case 31, it executes step S103 and then executes step S101 again.

[0054] In step S102, the control unit 40 performs control for normal operation.

[0055] In step S103, the control unit 40 performs control for maintenance operation.

[0056] Through steps S101 to S103, the control unit 40 performs control for normal operation during the attachment period when the cover 32 is attached to the case 31, and performs control for maintenance operation during the non-attachment period when the cover 32 is not attached to the case 31.

[0057] 1.6 Control for normal operation 9 and 10 are flowcharts showing a flow of control for normal operation performed by the control unit provided in the lighting device of the first embodiment.

[0058] When executing step S102 shown in FIG. 8, the control unit 40 executes steps S111 to S124 shown in FIGS.

[0059] In step S111, the control unit 40 determines whether the mode is set to the abnormal mode. If the control unit 40 determines that the mode is set to the abnormal mode, it executes step S112. If the control unit 40 determines that the mode is not set to the abnormal mode, it executes step S119. The abnormal mode is a mode for strongly cooling the supply unit 34 to eliminate a state in which the temperature of the supply unit 34 is too high.

[0060] In step S112, the control unit 40 determines whether or not the abnormal mode release condition is satisfied. If the control unit 40 determines that the abnormal mode release condition is satisfied, it executes step S113 and then step S114. If the control unit 40 determines that the abnormal mode release condition is not satisfied, it executes step S122. The abnormal mode release condition is, for example, that the temperature detected by the temperature detection unit 35 is lower than a set temperature. The set temperature is, for example, 61.6°C.

[0061] In step S113, control unit 40 cancels the abnormal mode.

[0062] In step S114, the control unit 40 determines whether or not the presence of a person has been detected by the human detection unit 38. If the control unit 40 determines that the presence of a person has been detected, it executes steps S115 and S116, and then ends the execution of step S102 shown in Fig. 8. If the control unit 40 determines that the absence of a person has been detected, it executes steps S117 and S118, and then ends the execution of step S102 shown in Fig. 8.

[0063] In step S115, the control unit 40 causes the blower 36 to blow air at a "standard" air volume.

[0064] In step S116, the control unit 40 causes the supply unit 34 to turn on the light-emitting element 33.

[0065] In step S117, the control unit 40 causes the blower 36 to blow air at a "strong" air volume. The "strong" air volume is stronger than the "standard" air volume.

[0066] In step S118, the control unit 40 causes the supply unit 34 to turn off the light-emitting element 33.

[0067] When the abnormal mode release conditions are satisfied while the mode is set to the abnormal mode through steps S111 to S118, the control unit 40 releases the abnormal mode and performs normal control through steps S114 to S118. When performing normal control, the control unit 40 causes the blower unit 36 ​​to blow air at a "standard" air volume and the supply unit 34 to turn on the light-emitting element 33 if a person is present, and causes the blower unit 36 ​​to blow air at a "strong" air volume and the supply unit 34 to turn off the light-emitting element 33 if a person is not present.

[0068] In step S119, the control unit 40 determines whether or not the setting conditions for the abnormal mode are satisfied. If the control unit 40 determines that the setting conditions for the setting mode are satisfied, it executes steps S120 and S121, and then ends the execution of step S102 shown in FIG. 8. If the control unit 40 determines that the setting conditions for the abnormal mode are not satisfied, it executes step S114. The setting condition for the abnormal mode is, for example, a condition that the temperature detected by the temperature detection unit 35 is equal to or higher than a first temperature that has been set. The first temperature that has been set is, for example, 103°C.

[0069] According to steps S111 and S114 to S119, if the abnormal mode setting conditions are not satisfied when the mode is not set to abnormal mode, the control unit 40 maintains the state in which the mode is not set to abnormal mode, and performs normal control from steps S114 to S118.

[0070] In step S120, the control unit 40 sets the mode to the abnormal mode.

[0071] In step S121, the control unit 40 performs a first control for eliminating the abnormal state. The first control is a control for strongly cooling the supply unit 34 to eliminate the state in which the temperature of the supply unit 34 is too high. An example of the first control will be described later.

[0072] Through steps S111 and S119 to S121, if the abnormal mode setting conditions are met when the mode is not set to abnormal mode, the control unit 40 sets the mode to abnormal mode and performs a first control to resolve the abnormal state.

[0073] In step S122, the control unit 40 determines whether or not the first control for eliminating the abnormal state is being performed. If the control unit 40 determines that the first control is being performed, it executes step S123. If the control unit 40 determines that the first control is not being performed, it ends the execution of step S102 shown in FIG.

[0074] In step S123, the control unit 40 determines whether or not a condition for transitioning to the second control for eliminating the abnormal state is satisfied. If the control unit 40 determines that the condition for transitioning to the second control is satisfied, it executes step S124 and then terminates execution of step S102 shown in FIG. 8. If the control unit 40 determines that the condition for transitioning to the second control is not satisfied, it terminates execution of step S102 shown in FIG. 8. The condition for transitioning to the second control is, for example, a condition that the temperature detected by the temperature detection unit 35 is equal to or higher than a set second temperature. The set second temperature is a temperature higher than the set first temperature, for example, 113°C.

[0075] In step S124, the control unit 40 performs a second control to eliminate the abnormal state. The second control is a control to cool the supply unit 34 more strongly than the first control to eliminate the state in which the temperature of the supply unit 34 is too high. An example of the second control will be described later.

[0076] By steps S111, S112 and S122 to S124, the control unit 40 performs the second control when the condition for shifting to the second control for eliminating the abnormal state is satisfied while the first control for eliminating the abnormal state is being performed. This allows the supply unit 34 to be cooled more strongly when the temperature of the supply unit 34 continues to be high even when the first control is being performed.

[0077] 1.7 Examples of primary and secondary controls for eliminating abnormal conditions FIG. 11 is a table showing examples of the first control and the second control for eliminating an abnormal state, which are performed by the control unit included in the lighting device of the first embodiment.

[0078] 11, when the temperature detected by the temperature detection unit 35 is equal to or higher than the first temperature but lower than the second temperature, for example, equal to or higher than 103°C and lower than 113°C, the control unit 40 performs a first control to eliminate the abnormal state. When performing the first control, the control unit 40 causes the blower unit 36 ​​to blow air at 100% of the maximum air volume and causes the supply unit 34 to reduce the brightness of the light emitted by the light-emitting element 33 to 20% of the maximum brightness, i.e., causes the light-emitting element 33 to be dimly lit. This makes it possible to reduce the heat emitted by the supply unit 34 while cooling the supply unit 34 most strongly.

[0079] When the temperature detected by the temperature detection unit 35 is equal to or higher than the set second temperature, for example, equal to or higher than 113° C., the control unit 40 performs a second control to eliminate the abnormal state. When performing the second control, the control unit 40 causes the blower unit 36 ​​to blow air at 100% of the maximum air volume, and causes the supply unit 34 to reduce the brightness of the light emitted by the light-emitting element 33 to 0% of the maximum brightness, i.e., turns off the light-emitting element 33. This makes it possible to eliminate the heat emitted by the supply unit 34 while cooling the supply unit 34 most strongly.

[0080] 1.8 Control for operation during maintenance FIG. 12 is a flowchart showing a flow of control for maintenance operation performed by the control unit provided in the lighting device of the first embodiment.

[0081] When executing step S103 shown in FIG. 8, the control unit 40 executes steps S131 to S136 shown in FIG.

[0082] In step S131, the control unit 40 causes the blower 36 to stop blowing air.

[0083] In the next step S132, the control unit 40 determines whether or not the presence of a person is detected by the human detection unit 38. If the control unit 40 determines that the presence of a person is detected, it executes step S133 and then ends the execution of step S103 shown in Fig. 8. If the control unit 40 determines that the absence of a person is detected, it executes step S134.

[0084] In step S133, the control unit 40 causes the supply unit 34 to adjust the brightness of the light emitted by the light-emitting element 33 to a brightness corresponding to the temperature detected by the detection unit 37. In this case, the control unit 40 causes the supply unit 34 to adjust the brightness to a brightness selected from a plurality of brightnesses.

[0085] Through steps S131 to S133, the control unit 40 causes the blower 36 to stop blowing air during the non-attachment period during which the detection unit 37 detects that the cover 32 is not attached to the case 31, and during the presence period during which the presence of a person is detected by the human detection unit 38. The control unit 40 causes the supply unit 34 to make the brightness of the light emitted by the light-emitting element 33 brighter according to the temperature detected by the detection unit 37. As a result, when a person is present and there is a possibility that the present person will perform maintenance on the lighting device 1, the blower 36 stops blowing air and the light-emitting element 33 emits light having a brightness according to the temperature of the supply unit 34. As a result, the person performing maintenance will not come into contact with the high-voltage part and the moving part of the blower 36. In addition, the work site where maintenance is performed can be bright enough to perform the work comfortably. In addition, the temperature of the supply unit 34 can be prevented from becoming too high.

[0086] In step S134, the control unit 40 determines whether or not a set time has elapsed since the presence of a person was detected by the human detection unit 38. If the control unit 40 determines that the set time has elapsed, it executes step S135. If the control unit 40 determines that the set time has not elapsed, it executes step S133 and then ends the execution of step S103 shown in FIG. 8.

[0087] In step S135, the control unit 40 determines whether or not the supply unit 34 has turned off the light-emitting element 33. If the control unit 40 determines that the supply unit 34 has turned off the light-emitting element 33, the control unit 40 ends the execution of step S102 shown in Fig. 8. If the control unit 40 determines that the supply unit 34 has not turned off the light-emitting element 33, the control unit 40 executes step S136 and then ends the execution of step S103 shown in Fig. 8.

[0088] In step S136, the control unit 40 causes the supply unit 34 to set the brightness of the light emitted by the light emitting element 33 to the minimum brightness included in the above-mentioned plurality of brightnesses, for example, 10% of the maximum brightness.

[0089] Through steps S131, S132 and S134 to S136, the control unit 40 causes the blower 36 to stop blowing air during the unattached period during which the detection unit 37 detects that the cover 32 is not attached to the case 31, and during the unattached period during which the human detection unit 38 detects that a person is present, the control unit 40 causes the supply unit 34 to set the brightness of the light emitted by the light-emitting element 33 to the minimum brightness included in the multiple brightnesses, except when the light-emitting element 33 has already been turned off. As a result, when no person is present and there is no possibility that maintenance of the lighting device 1 will be performed, the blower 36 stops blowing air and the light-emitting element 33 emits light having the minimum brightness included in the multiple brightnesses. This makes it possible to reduce the heat generated by the supply unit 34. As a result, when there is little need to brighten the space in which the lighting device 1 is installed, the light emitted by the light-emitting element 33 is dimmed to prevent the temperature of the supply unit 34 from increasing. The reason why the brightness of the light emitted by the light-emitting element 33 is not turned off during the unattached period and the unmanned period is to enable a person who has been performing maintenance on other lighting devices in a space where multiple lighting devices are installed to easily identify the lighting device 1 that he or she is performing maintenance on when the person returns to the vicinity of the lighting device 1 to perform maintenance on the other lighting device.

[0090] In step S134, after a set time has elapsed since the start of the unattended period during the unattached period, the control unit 40 causes the supply unit 34 to set the brightness of the light emitted by the light-emitting element 33 to the minimum brightness included in the plurality of brightnesses. This makes it possible to prevent the space where maintenance is performed from becoming dark immediately after a person leaves the vicinity of the lighting device 1.

[0091] The control unit 40 causes the supply unit 34 to set the brightness of the light emitted by the light-emitting element 33 to a brightness selected from a plurality of brightnesses during the manned period of the non-wearing period, and causes the supply unit 34 to set the brightness to the minimum brightness included in the plurality of brightnesses during the unmanned period of the non-wearing period, thereby causing the supply unit 34 to suppress the brightness more strongly during the unmanned period of the non-wearing period than during the manned period of the non-wearing period. As a result, when there is little need to brighten the space where maintenance is performed, the light emitted by the light-emitting element 33 can be dimmed to suppress the temperature of the supply unit 34 from increasing.

[0092] 1.9 Temperature-dependent brightness control FIG. 13 is a flowchart showing a flow of temperature-dependent brightness control performed by the control unit included in the lighting device of the first embodiment.

[0093] When executing step S133 shown in FIG. 12, the control unit 40 executes steps S141 to S144 shown in FIG.

[0094] In step S141, the control unit 40 determines whether or not the supply unit 34 has already started to adjust the brightness of the light emitted by the light-emitting element 33 to a brightness corresponding to the temperature detected by the temperature detection unit 35. If the control unit 40 determines that the supply unit 34 has already started to adjust the brightness to a brightness corresponding to the temperature, it executes step S142. If the control unit 40 determines that the control unit 40 has not yet started to adjust the brightness to a brightness corresponding to the temperature, it executes step S144 and then ends the execution of step S133 shown in FIG.

[0095] In step S142, the control unit 40 determines whether or not the temperature detected by the temperature detection unit 35 exceeds the threshold. If the control unit 40 determines that the temperature exceeds the threshold, it executes step S143 and then ends the execution of step S133 shown in Fig. 12. If the control unit 40 determines that the temperature does not exceed the threshold, it ends the execution of step S133 shown in Fig. 12.

[0096] In step S143, the control unit 40 causes the supply unit 34 to change the brightness of the light emitted by the light-emitting element 33.

[0097] In step S144, the control unit 40 causes the supply unit 34 to set the brightness of the light emitted by the light-emitting element 33 to the initial brightness.

[0098] Through steps S141 to S144, the control unit 40 causes the supply unit 34 to set the brightness of the light emitted by the light-emitting element 33 to the initial brightness immediately after starting to cause the supply unit 34 to set the brightness of the light emitted by the light-emitting element 33 to the temperature detected by the temperature detection unit 35. Furthermore, after causing the supply unit 34 to set the brightness of the light emitted by the light-emitting element 33 to the initial brightness, the control unit 40 changes the brightness of the light emitted by the light-emitting element 33 in synchronization with the temperature detected by the temperature detection unit 35 exceeding the threshold value.

[0099] 1.10 Initial brightness FIG. 14 is a table showing the relationship between the temperature detected by a temperature detection unit provided in the lighting device and the initial brightness of light emitted by a plurality of light-emitting elements provided in the lighting device of the first embodiment, when the brightness is controlled according to temperature by a control unit provided in the lighting device.

[0100] 14, the control unit 40 compares the temperature detected by the temperature detection unit 35 with a threshold value included in the plurality of threshold values, and determines the initial brightness based on the comparison result. The plurality of threshold values ​​are, for example, three threshold values ​​consisting of 60°C, 80°C, and 100°C.

[0101] The control unit 40 darkens the initial brightness as the temperature detected by the temperature detection unit 35 increases. For example, when the temperature detected by the temperature detection unit 35 is less than 60° C., the control unit 40 determines the initial brightness to be 30% of the maximum brightness, when the temperature detected by the temperature detection unit 35 is 60° C. or more and less than 80° C., the control unit 40 determines the initial brightness to be 20% of the maximum brightness, when the temperature detected by the temperature detection unit 35 is 80° C. or more and less than 100° C., the control unit 40 determines the initial brightness to be 10% of the maximum brightness, and when the temperature detected by the temperature detection unit 35 is 100° C. or more, the control unit 40 determines the initial brightness to be 0% of the maximum brightness, i.e., turns off the light-emitting element 33.

[0102] 1.11 Brightness change FIG. 15 is a table showing the relationship between the change in temperature detected by a temperature detection unit provided in the lighting device of the first embodiment and the brightness of light emitted by a plurality of light-emitting elements provided in the lighting device before and after the change, when the brightness is controlled according to temperature by a control unit provided in the lighting device.

[0103] 15, the control unit 40 compares the temperature detected by the temperature detection unit 35 with a threshold value included in the plurality of threshold values, and determines the brightness of the light emitted by the light-emitting element 33 based on the comparison result. The plurality of threshold values ​​are, for example, six threshold values ​​consisting of 50°C, 60°C, 70°C, 80°C, 90°C, and 100°C.

[0104] The control unit 40 controls the supply unit 34 to dim the brightness of the light emitted by the light-emitting element 33 as the temperature detected by the temperature detection unit 35 increases. When the temperature detected by the temperature detection unit 35 changes from the first temperature to a second temperature exceeding a threshold value, the control unit 40 changes the brightness of the light emitted by the light-emitting element 33 from the first brightness to the second brightness. For example, when the temperature changes from less than 60°C to more than 60°C to 60°C or more, the control unit 40 changes the brightness from 30% of the maximum brightness to 20% of the maximum brightness, when the temperature changes from less than 80°C to more than 80°C to 80°C or more, the control unit 40 changes the brightness from 20% of the maximum brightness to 10% of the maximum brightness, and when the temperature changes from less than 100°C to more than 100°C to 100°C or more, the control unit 40 changes the brightness from 10% of the maximum brightness to 0% of the maximum brightness. In addition, the control unit 40 changes the brightness from 0% of maximum brightness to 10% of maximum brightness when the temperature changes from 90°C or higher to over 90°C but less than 90°C, changes the brightness from 10% of maximum brightness to 20% of maximum brightness when the temperature changes from 70°C or higher to over 70°C but less than 70°C, and changes the brightness from 20% of maximum brightness to 30% of maximum brightness when the temperature changes from 50°C or higher to over 50°C but less than 50°C.

[0105] As can be understood by comparing Fig. 14 and Fig. 15 with Fig. 11, the control unit 40 makes the suppression of brightness during the non-wearing period stronger than the suppression of brightness during the wearing period by lowering the threshold value that must be exceeded when the brightness of light emitted by the light-emitting element 33 during the non-wearing period to a specific brightness, compared to the threshold value that must be exceeded when the brightness is set to a specific brightness during the wearing period. That is, the control unit 40 makes the supply unit 34 make the brightness a specific brightness when the temperature exceeds a first threshold temperature during the wearing period, and makes the suppression of brightness during the non-wearing period stronger than the suppression of brightness during the wearing period by making the suppression of brightness during the non-wearing period stronger than the suppression of brightness during the wearing period. For example, during the wearing period, when the temperature changes from less than 103° C. to more than 103° C. and becomes 103° C. or more, the control unit 40 causes the supply unit 34 to set the brightness to 20% of the maximum brightness, and during the non-wearing period, when the temperature changes from less than 60° C. to more than 60° C. and becomes 60° C. or more, the control unit 40 causes the supply unit 34 to set the brightness to 20% of the maximum brightness. In this way, when the blowing of air by the blower 36 is stopped to increase the safety of the lighting device 1 during maintenance, the blown air cannot cool the supply unit 34, and the temperature of the supply unit 34 is likely to increase. In this way, the brightness can be reduced early to prevent the temperature of the supply unit 34 from becoming too high.

[0106] In the control for the above-mentioned maintenance operation, it is necessary to detect the temperature of the supply unit 34. However, the detection of the temperature of the supply unit 34 in the control for the maintenance operation can be performed using the temperature detection unit 35 that is used to detect the temperature of the supply unit 34 in the control for the normal operation. Therefore, the control for the above-mentioned maintenance operation does not require a new temperature detection unit.

[0107] The present disclosure is not limited to the above-described embodiments, and may be replaced with a configuration that is substantially the same as the configuration shown in the above-described embodiments, a configuration that has the same action and effect, or a configuration that can achieve the same purpose. [Explanation of symbols]

[0108] 1 lighting device, 11 ceiling, 11a hole, 11b ceiling surface, 21 embedded portion, 22 exposed portion, 22a underside, 22b side, 22i outlet, 22j exhaust port, 22k intake port, 31 case, 31a opening, 31b air passage, 32 cover, 33 light-emitting element, 34 supply section, 35 temperature detection section, 36 air blowing section, 37 detection section, 38 human detection section, 39 ion generation section, 40 control section, 51 magnet, 71 main body, 71a first internal space, 71b second internal space, 81 magnetic sensor.

Claims

1. A light emitting element that emits light having a brightness according to the supplied power; A supply unit that supplies the power; A blower unit that blows air that hits the supply unit; A temperature detection unit that detects the temperature of the supply unit; a case that accommodates the light-emitting element, the supply unit, the blower unit, and the temperature detection unit; A cover that can be attached to and detached from the case; a detection unit that detects whether the cover is attached to the case; a control unit that stops the blower from blowing the air during a non-attachment period in which the detection unit detects that the cover is not attached to the case, and controls the supply unit to reduce the brightness as the temperature increases; A lighting device comprising:

2. The control unit is during a mounting period during which the detection unit detects that the cover is mounted on the case, the blower unit is caused to blow the air, and the higher the temperature, the lower the brightness is caused by the supply unit; The supply unit is caused to suppress the brightness during the non-wearing period more strongly than the suppression of the brightness during the wearing period.

10. The lighting device of claim 1.

3. Making the suppression of the brightness during the non-wearing period stronger than the suppression of the brightness during the wearing period includes making the brightness a specific brightness when the temperature during the wearing period exceeds a first threshold temperature, and making the brightness the specific brightness when the temperature during the non-wearing period exceeds a second threshold temperature lower than the first threshold temperature.

3. The lighting device according to claim 2.

4. A human detection unit is provided to detect whether or not a human is present, The control unit causes the supply unit to suppress the brightness in an unmanned period in which the absence of the person is detected by the human detection unit during the non-wearing period more strongly than in a manned period in which the presence of the person is detected by the human detection unit during the non-wearing period.

4. An illumination device according to claim 1.

5. The suppression of the brightness during the unmanned period being stronger than the suppression of the brightness during the manned period includes setting the brightness to a brightness selected from a plurality of brightnesses during the manned period and setting the brightness to the minimum brightness included in the plurality of brightnesses during the unmanned period.

5. The lighting device according to claim 4.

6. An ion generating unit that can be attached to and detached from the case and generates ions, the case accommodates the ion generating unit, The wind carries the ions to the outside of the case.

4. An illumination device according to claim 1.

Images