JP2019215999A - Illuminating device - Google Patents

Abstract

To provide an illuminating device having good visibility.SOLUTION: An illuminating device comprises: a first light source 11 for emitting coherent light; a second light source 12 for emitting incoherent light; a display unit 13 comprising a light guide body 31 for guiding the coherent light emitted from the first light source 11 and the incoherent light emitted from the second light source 12, and a display plate 35 for generating a speckle pattern from the coherent light, and for radiating the coherent light and the incoherent light; and a control unit for controlling driving of the first light source 11 and driving of the second light source 12.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a lighting device including a guide light.

  2. Description of the Related Art A lighting device called a guide light is widely used as a lighting device for notifying an evacuee and an evacuation direction in an emergency such as a fire (for example, see Patent Document 1). The guide light of Patent Literature 1 is normally lit by a normal power supply externally supplied, and automatically switches to the emergency power supply and illuminates when power cannot be supplied due to disconnection or power failure in an emergency. Thus, even if the illumination of the evacuation route is turned off in an emergency, the evacuee can recognize the evacuation opening and the evacuation direction according to the light emitted from the guide light, and can easily evacuate.

  In some lighting devices, when an evacuation route is detected as dangerous by a detector, even if there is an emergency power supply, it is turned off to prevent evacuees from being guided. In order to guide evacuees, guide lights have been proposed that project visible light lasers emitted from a semiconductor laser on a wall surface, a ceiling surface, a floor surface, and the like in a linear manner (for example, see Patent Document 2). .

Japanese Patent No. 5325084 JP-A-8-22701

  However, in Patent Literature 1 and Patent Literature 2, visibility in one of a normal state and an emergency is poor. The lighting device disclosed in Patent Literature 1 automatically switches to an emergency power supply and lights up in an emergency. However, in an emergency, it is darker than the normal time of lighting by the common power supply, and in the event of a fire, the visibility is obstructed by smoke, making it difficult to see the guide light and lowering the visibility of the guide light. The lighting device disclosed in Patent Literature 2 does not emit light during normal use, so it is difficult for a person to recognize the position of the lighting device, and even when light is projected on a floor or the like in an emergency, the projected light is noticed. May not be.

  The present invention has been made to solve the above-described problems, and provides a lighting device with good visibility.

  The lighting device according to the present invention includes a first light source that emits coherent light, a second light source that emits incoherent light, and the coherent light emitted from the first light source and the second light source that is emitted from the second light source. A display unit that emits incoherent light; and a control unit that controls driving of the first light source and driving of the second light source.

  According to the present invention, one or both of the coherent light and the incoherent light are emitted from the display unit, so that the visibility to the lighting device is improved in both normal and emergency situations.

FIG. 1 is an external perspective view illustrating a configuration example of a lighting device according to Embodiment 1 of the present invention. FIG. 2 is an external perspective view showing the inside when the lighting device shown in FIG. 1 is viewed from the back side. FIG. 3 is an enlarged perspective view of the light source unit shown in FIG. FIG. 3 is an enlarged side view of the light source unit shown in FIG. 2. FIG. 2 is a block diagram illustrating a configuration example of a control unit illustrated in FIG. 1. 6 is a flowchart showing an operation procedure of the lighting device according to Embodiment 1 of the present invention. FIG. 2 is a diagram showing an emission spectrum in a display area of the display unit shown in FIG. 1. FIG. 3 is a diagram illustrating an example of a speckle pattern. FIG. 9 is an external perspective view illustrating a configuration example of a lighting device according to Embodiment 2 of the present invention. FIG. 10 is an external perspective view illustrating an example of a back side of the lighting device illustrated in FIG. 9. It is an external appearance perspective view which shows the inside of the illuminating device shown in FIG. FIG. 12 is an enlarged perspective view of the light source unit shown in FIG. It is an enlarged side view of the light source unit shown in FIG. FIG. 13 is an external perspective view illustrating a configuration example of a light source unit illustrated in FIG. 12. FIG. 15 is an external perspective view of the LED board shown in FIG. 14. FIG. 15 is an external perspective view of the relay holding unit and the holder illustrated in FIG. 14. FIG. 17 is an exploded perspective view of the configuration shown in FIG. 16. FIG. 15 is an enlarged view of a part of the holder illustrated in FIG. 14. FIG. 12 is a block diagram illustrating a configuration example of a control section illustrated in FIG. 11. 9 is a flowchart showing an operation procedure of the lighting device according to Embodiment 2 of the present invention. FIG. 10 is a diagram showing an emission spectrum in a display area of the display unit shown in FIG. 9.

Embodiment 1 FIG.
The configuration of the lighting device of the first embodiment will be described. FIG. 1 is an external perspective view illustrating a configuration example of a lighting device according to Embodiment 1 of the present invention. FIG. 2 is an external perspective view showing the inside when the lighting device shown in FIG. 1 is viewed from the back side. FIG. 2 shows a state where the rear housing of the lighting device is removed. FIG. 3 is an enlarged perspective view of the light source unit shown in FIG. FIG. 4 is an enlarged side view of the light source unit shown in FIG.

  In the first embodiment, the case where the lighting device 1 is a guide light will be described. However, the lighting device 1 is not limited to the guide light, and may be an emergency light. Guidance lights and emergency lights are a type of lighting equipment for indicating evacuation exits and evacuation directions.

  As shown in FIGS. 1 to 4, the lighting device 1 includes a first light source 11, a second light source 12, a display unit 13, a regular power supply 14, an emergency power supply 15, and a control unit 16. The first light source 11 and the second light source 12 are mounted on a light source unit 20.

  The first light source 11 is a light source that emits coherent light. The first light source 11 is, for example, a green semiconductor laser that emits green monochromatic light. When the first light source 11 is a green semiconductor laser, the emission wavelength of the first light source 11 is in the wavelength range of 495 to 570 nm, and the full width at half maximum of the emission spectrum is 10 nm or less. The second light source 12 is a light source that emits incoherent light. The second light source 12 is, for example, a white LED (light emitting diode) that emits white light.

  The display unit 13 emits coherent light emitted from the first light source 11 and incoherent light emitted from the second light source 12. The display unit 13 includes a light guide 31, a reflection plate 32, a diffusion plate 33, a prism sheet 34, and a display plate 35. The light guide 31, the diffusion plate 33, and the prism sheet 34 are arranged between the reflection plate 32 and the display plate 35 in this order from the reflection plate 32 side. In the display unit 13, the surface on the display plate 35 side is the front surface, and the reflection plate 32 side is the back surface. The display plate 35 has a display area 36 on the front side. The surface of the display area 36 faces the evacuation route. The display area 36 has a white light transmitting area 37a through which white light emitted from the second light source 12 is transmitted as white, and a green transmitting area 37b through which green monochromatic light of white light is transmitted.

  The light guide 31 is a rectangular plate having a thickness in the direction of the Y-axis arrow shown in FIG. As shown in FIG. 4, the first light source 11 and the second light source 12 are arranged so as to face the upper surface side end of the light guide 31. The light guide 31 is arranged in the direction in which the light from the first light source 11 and the light from the second light source 12 is emitted, and guides coherent light and incoherent light. FIG. 4 shows the light emission direction by a white arrow (the direction opposite to the Z-axis arrow). Light incident on the display unit 13 from the first light source 11 and the second light source 12 propagates through the light guide 31 and is repeatedly reflected and diffused in the light guide 31, and then passes through the diffusion plate 33 and the prism sheet 34. Then, the light is emitted from the display area 36 of the display panel 35.

  The service power supply 14 and the emergency power supply 15 are provided on a power supply board. The emergency power supply 15 is, for example, a battery. The regular power supply 14 operates the lighting device 1 during regular use when power is supplied from the outside. The service power supply 14 charges the emergency power supply 15 at the time of service. The emergency power supply 15 operates the lighting device 1 in the event of an emergency such as a fire during a power outage.

  In an emergency without a power failure, the lighting device 1 may be operated by the regular power supply 14 or may be operated by the emergency power supply 15 in the same manner as in normal use.

  FIG. 5 is a block diagram illustrating a configuration example of the control unit illustrated in FIG. 1. The control unit 16 illustrated in FIG. 5 is, for example, a microcomputer. The control unit 16 determines which of the two light sources of the first light source 11 and the second light source 12 is in use, and based on the determination result, one or two of the two light sources. Drive both. For example, the control unit 16 drives the first light source 11 in a situation where the visibility of the display unit 13 needs to be improved. Drive. At that time, the control unit 16 uses the normal power supply 14 in an emergency without a power failure and uses the emergency power supply 15 in an emergency with a power failure as a power supply unit for a light source to be driven.

  Next, the procedure of the light source switching control of the illumination device 1 according to the first embodiment will be described. Here, the case where the first light source 11 is a green semiconductor laser and the second light source 12 is a white LED will be described. FIG. 6 is a flowchart showing an operation procedure of the lighting device according to Embodiment 1 of the present invention.

  The control unit 16 determines whether or not it is necessary to improve the visibility of the display unit 13 (Step S101). For example, when the building in which the lighting device 1 is installed loses power, the lighting fixtures installed in the building are turned off, so that it is necessary to improve the visibility of the people in the building with respect to the display unit 13. The control unit 16 monitors the state of the regular power supply 14, and when the power supply from the regular power supply 14 stops, can determine that the power failure has caused a situation in which the visibility of the display unit 13 needs to be improved.

  As a result of the determination in step S101, when it is not a situation where the visibility of the display unit 13 needs to be improved, the control unit 16 drives the second light source 12 with the regular power supply 14 (step S102). As described above, at the time of normal use, the control unit 16 drives the second light source 12 by the normal power supply 14, so that the second light source 12 emits white light.

  The white light emitted from the second light source 12 propagates to the light guide 31 of the display unit 13. The white light incident on the light guide 31 is repeatedly reflected in the light guide 31. The white light emitted from the light guide 31 to the back side is reflected by the reflection plate 32 and returns into the light guide 31. When the total reflection condition is broken in the light guide 31, the white light is emitted from the display surface of the display panel 35 via the diffusion plate 33 and the prism sheet 34. White light is emitted from the white light transmitting area 37a, and green light is emitted from the green transmitting area 37b.

  FIG. 7 is a diagram showing an emission spectrum in a display area of the display unit shown in FIG. The second light source 12 emits light having a white emission spectrum, for example, as shown in the graph of FIG. Here, the white emission spectrum is white, which has a chromaticity point at a color temperature of about 5000K. Since the white light transmitting region 37a of the display unit 13 displays white light emitted from the second light source 12 as white, the white light transmitting region 37a becomes white. In FIG. 7, this white emission spectrum is indicated as a white transmission filter spectrum.

  The green transmission region 37b serves as a filter that transmits green light, for example, as shown in the graph of FIG. Therefore, when white light emitted from the second light source 12 passes through the green transmission region 37b of the display unit 13, green light is selectively transmitted, and green light is emitted from the green transmission region 37b. In FIG. 7, this green emission spectrum is indicated as a green transmission filter spectrum. The white light emitted from the second light source 12 and transmitted through the green transmission region 37b has a dominant wavelength that matches the green laser light of the first light source 11.

  On the other hand, if the result of the determination in step S101 shown in FIG. 6 indicates that a situation requiring improvement in the visibility of the display unit 13 is required due to an emergency involving a power failure, the control unit 16 uses the emergency power supply 15 11 is driven (step S103). As described above, the controller 16 drives the first light source 11 in an emergency with a power failure, so that the first light source 11 emits green laser light.

  The green laser light emitted from the first light source 11 propagates to the light guide 31 of the display unit 13. The green laser light incident on the light guide 31 is repeatedly reflected and diffused in the light guide 31 and then emitted from the display surface of the display panel 35 via the diffusion plate 33 and the prism sheet 34. For example, as shown in the green semiconductor laser spectrum of FIG. 7, the green laser light has a very narrow spectral line width and a wavelength position at a position where it is transmitted through both the white light transmitting region 37a and the green transmitting region 37b. Therefore, blue light is emitted from the entire surface of the display area 36 of the display panel 35.

  Furthermore, unlike the incoherent light emitted from the second light source 12, the green laser light is a coherent light, and thus generates a speckle pattern. FIG. 8 is a diagram illustrating an example of a speckle pattern. The speckle pattern shown in Fig. 8 is disclosed in "Statistical Optics" (Joseph W. Goodman).

  The speckle pattern is generated by interference on the surface of the display panel 35 of the display unit 13 and on the human retina. For example, light scattered on the display surface of the display panel 35 undergoes a random phase change and appears as a non-uniform granular intensity pattern.

  For example, when the evacuation route is full of smoke due to a fire, the laser light is scattered by the smoke, and the generation of a speckle pattern is further promoted. Therefore, even if the evacuees cannot see the display surface of the lighting device 1, the evacuees can easily recognize the direction in which the lighting device 1 is located.

  In the first embodiment, the situation in which the visibility of the display unit 13 needs to be improved has been described in the case of a power failure, but is not limited to this case. For example, in order to detect whether the visibility of the display unit 13 needs to be improved, a detector that detects at least one of heat, flame, and smoke may be provided in the lighting device 1. It may be provided separately from the device 1. This is because, when a fire occurs, the interior of the room becomes high heat, and flame and smoke are generated, so that it is considered that a situation in which the visibility of the display unit 13 needs to be improved is required.

  When the detector is provided separately from the lighting device 1, the detector and the control unit 16 only need to include a unit that transmits and receives a signal via a wired or wireless communication unit. For example, in the event of an emergency such as a fire, if the detected heat is higher than the normal room temperature, the detector outputs a visibility detection signal indicating that the visibility of the display unit 13 needs to be improved. Output to When the detected heat is equal to the room temperature in normal use, the detector outputs to the control unit 16 a visibility detection signal indicating that the visibility of the display unit 13 does not need to be improved.

  Further, in the first embodiment, the case has been described where the control unit 16 drives one of the first light source 11 and the second light source 12, but both may be driven. For example, in an emergency without a power failure, light is emitted from both the first light source 11 and the second light source 12, so that the visibility of the display unit 13 is further improved.

  The illumination device 1 according to the first embodiment includes a first light source 11 that emits coherent light, a second light source 12 that emits incoherent light, a display unit 13 that emits these lights, and a first light source 11. It has a control unit 16 that controls driving and driving of the second light source 12.

  According to the first embodiment, one or both of the coherent light and the incoherent light are emitted from the display unit 13, so that the visibility of the lighting device 1 is improved in both normal and emergency situations. improves. When the coherent light is radiated from the display unit 13, a speckle pattern is generated by interference between the display unit 13 and the human retina. The speckle pattern is such that the scattered light is subjected to a random phase change and becomes a non-uniform granular intensity pattern that can be seen by a person, so that the visibility of the lighting device 1 is further improved.

  When both the coherent light and the incoherent light are emitted from the display unit 13 and the dominant wavelength of the incoherent light emitted from the display unit 13 matches the coherent light, the visibility of the lighting device 1 is further improved. For example, as described in the first embodiment, when the first light source 11 is a green laser and the second light source 12 is a white LED, light emitted from the green transmission region 37b of the display unit 13 is more emphasized. The effect that the shape of the person stands out is obtained.

  In addition, the lighting device 1 according to the first embodiment determines whether or not it is a situation in which the visibility of the display unit 13 needs to be improved, and switches one of the first light source 11 and the second light source 12 to one. It may be driven. For example, in a situation where the visibility of the display unit 13 needs to be improved, the control unit 16 drives the first light source 11 of the first light source 11 and the second light source 12 and controls the visibility of the display unit 13. If the situation does not require improvement, the second light source 12 is driven.

  In an emergency, when the first light source 11 emits coherent light, the coherent light interferes with the display unit 13 and the retina of a person, thereby generating a speckle pattern. As described above, the speckle pattern is extremely conspicuous even from a distance because the scattered light is viewed by a person as a non-uniform granular intensity pattern due to a random phase change. As a result, the visibility of the illumination device 1 is improved even in an emergency.

  For example, when the evacuation route is full of smoke due to a fire, coherent light is scattered by the smoke, and the occurrence of a speckle pattern is further promoted. As a result, even if the evacuee cannot see the display surface of the lighting device 1, it becomes easy to visually recognize the direction in which the lighting device 1 is located.

  In the first embodiment, the control unit 16 may receive a visibility detection signal indicating whether or not the visibility of the display unit 13 needs to be improved from the detector. In this case, even in an emergency other than a power outage, the visibility of the lighting device 1 to a person can be improved.

  In addition, the lighting device 1 according to the first embodiment includes a light guide 31 arranged in the emission direction of the coherent light and the incoherent light, and a display panel that generates a speckle pattern from the coherent light incident from the light guide 31. 35. A speckle pattern is generated by interference of coherent light on the display surface of the display panel 35. Since the light scattered on the display surface of the display panel 35 is viewed as a non-uniform granular intensity pattern due to a random phase change, the illuminating device 1 is more conspicuous even from a distance, and is visually recognized by the person. The performance is improved.

Embodiment 2. FIG.
The lighting device according to the second embodiment enables an evacuee to recognize whether or not the evacuation route where the lighting device is installed is safe in an emergency such as a fire. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

  The configuration of the lighting device according to the second embodiment will be described. FIG. 9 is an external perspective view illustrating a configuration example of a lighting device according to Embodiment 2 of the present invention. FIG. 10 is an external perspective view illustrating an example of the back side of the lighting device illustrated in FIG. 9. FIG. 11 is an external perspective view illustrating the inside of the lighting device illustrated in FIG. 10. FIG. 12 is an enlarged perspective view of the light source unit shown in FIG. FIG. 13 is an enlarged side view of the light source unit shown in FIG.

  The lighting device 1a according to the second embodiment includes a third light source 17 and a detector 18 in addition to the configuration of the lighting device 1 described in the first embodiment. As shown in FIG. 12, a first light source 11, a second light source 12, and a third light source 17 are mounted on a light source unit 20a. The third light source 17 is a light source that emits coherent light having a wavelength different from that of the coherent light emitted by the first light source 11. The third light source 17 is, for example, a red semiconductor laser that emits red monochromatic light. When the third light source 17 is a red semiconductor laser, the emission wavelength of the third light source 17 is in a wavelength range of 620 to 750 nm, and the full width at half maximum of the emission spectrum is 10 nm or less.

  The detector 18 shown in FIG. 11 detects whether the evacuation route around the display unit 13 is safe. The evacuation route around the display unit 13 is, for example, a passage facing a wall where the lighting device 1a is installed. The detector 18 is, for example, a heat detector. The detector 18 has a temperature sensor and a sensor circuit board, not shown. The detector 18 outputs a detection signal indicating a detection result to the control unit 16. For example, in the event of a fire or the like, if the detected heat is higher than the normal room temperature, the detector 18 outputs a route detection signal indicating that the evacuation route is dangerous to the control unit 16. When the detected heat is equal to the room temperature in normal use, the detector 18 outputs a route detection signal indicating that the evacuation route is safe to the control unit 16.

  The configuration of the light source unit 20a shown in FIG. 12 will be described. FIG. 14 is an external perspective view illustrating a configuration example of the light source unit illustrated in FIG. FIG. 15 is an external perspective view of the LED substrate shown in FIG. FIG. 16 is an external perspective view of the relay holding unit and the holder shown in FIG. FIG. 17 is an exploded perspective view of the configuration shown in FIG.

  As shown in FIG. 14, the light source unit 20a has an LED board 21, a relay holding unit 22, and a holder 23. As shown in FIG. 15, the second light source 12 is mounted on the LED board 21. The LED substrate 21 is, for example, FR4 and CEM3 made of glass epoxy. The LED substrate 21 may be a metal core substrate made of an aluminum base.

  The LED board 21 has an electronic circuit (not shown) for supplying power to the second light source 12, and serves to supply power supplied from the commercial power supply 14 to the second light source 12 via the connector 112. Further, the LED substrate 21 also plays a role of releasing heat generated from the second light source 12. The LED board 21 has a relief hole 111 for allowing the first light source 11 and the third light source 17 to pass through the LED board 21.

  The holder 23 is made of, for example, an extruded aluminum material. The holder 23 has a socket hole 131 into which the electrode pins 121 of the first light source 11 and the third light source 17 are inserted, and a screw 123 for holding the first light source 11 and the third light source 17 via the relay holding part 22. And a screw hole 132. An insulating material (not shown) is provided on the inner peripheral surface of the socket hole 131, and the insulating material electrically insulates the electrode pin 121 from the holder 23. The holder 23 not only functions to hold the first light source 11 and the third light source 17 but also functions as a heat sink that promotes heat radiation of the heat generated from the first light source 11 and the third light source 17.

  The relay holding section 22 is made of, for example, a metal such as aluminum. The relay holding portion 22 has a through screw hole 122 through which the screw 123 passes, and a through hole 124 that holds the first light source 11 and the third light source 17.

  The method of assembling the light source unit 20a shown in FIG. 14 will be briefly described with reference to FIGS. As shown in FIG. 17, the electrode pins 121 of the first light source 11 and the third light source 17 are inserted into the socket holes 131 of the holder 23. Subsequently, the position of the through hole 124 of the relay holding unit 22 is adjusted to the position of each light source of the first light source 11 and the third light source 17, and the relay holding unit 22 is placed over each light source from below each light source. The screw 123 is passed through the through screw hole 122 of the relay holding portion 22, and the screw 123 is fixed to the screw hole 132 of the holder 23.

  In this way, as shown in FIG. 16, the first light source 11 and the third light source 17 are attached to the holder 23 via the relay holder 22. The first light source 11 and the third light source 17 are strongly pressed against the holder 23 and make sufficient contact with the holder 23. Therefore, heat generated from the first light source 11 and the third light source 17 efficiently radiates from the holder 23.

  The LED board 21 shown in FIG. 15 is attached to the relay holding part 22 by aligning the position of the escape hole 111 of the LED board 21 with the position of each light source of the first light source 11 and the third light source 17 shown in FIG. Thus, the light source unit 20a shown in FIG. 14 is assembled. As shown in FIG. 14, the light emitting positions of the first light source 11, the second light source 12, and the third light source 17 can be set at the same height.

  In the light source unit 20a, the heat generated from the first light source 11 and the third light source 17 is radiated through the holder 23, and the heat generated from the second light source 12 is radiated through the LED board 21. Therefore, the heat radiation path of the heat generated from the first light source 11 and the third light source 17 and the heat radiation path of the heat generated from the second light source 12 can be separated.

  Light guides 31 are arranged in the light emission directions of the first light source 11, the second light source 12, and the third light source 17 shown in FIG. 14, as shown in FIG. Light emitted from the first light source 11, the second light source 12, and the third light source 17 is incident on the light guide 31 from the upper surface side end of the light guide 31.

  FIG. 18 is an enlarged view of a part of the holder shown in FIG. The electrode pin 121 inserted into the socket hole 131 is electrically connected to a wiring (not shown) in the holder 23 via a connector or the like (not shown). The wiring connected to the electrode pins 121 is connected to the normal power supply 14 and the emergency power supply 15 shown in FIG. 11 via a wiring guide 133 shown in FIG. 18, for example.

  Next, the configuration of the control unit 16 of the lighting device 1a according to the second embodiment will be described. FIG. 19 is a block diagram illustrating a configuration example of the control unit illustrated in FIG. When the route detection signal received from the detector 18 indicates that the evacuation route is safe, the control unit 16 drives the first light source 11 as in the first embodiment. The control unit 16 drives the third light source 17 when the route detection signal received from the detector 18 indicates that the evacuation route is dangerous.

  Next, a procedure of light source switching control of the illumination device 1a according to the second embodiment will be described. Here, the case where the first light source 11 is a green semiconductor laser, the second light source 12 is a white LED, and the third light source 17 is a red semiconductor laser will be described. FIG. 20 is a flowchart showing an operation procedure of the lighting device according to Embodiment 2 of the present invention. In the second embodiment, the normal operation (steps S201 and S202 shown in FIG. 20) of the lighting device 1a is the same as that of steps S101 and S102 shown in FIG. 6, and a detailed description thereof will be omitted.

  In step S203 illustrated in FIG. 20, the control unit 16 determines whether the evacuation route is safe based on the route detection signal received from the detector 18. When the route detection signal indicates that the evacuation route is safe, the control unit 16 drives the first light source 11 as in step S103 illustrated in FIG. 6 (step S204). In this case, as described in the first embodiment, the green laser light emitted from the first light source 11 is repeatedly reflected in the light guide 31 and diffused, and then passes through the diffusion plate 33 and the prism sheet 34. The light exits from the display surface of the display panel 35. As a result, blue light is emitted from the entire surface of the display area 36 of the display panel 35. This allows the evacuees to recognize that the evacuation route where the lighting device 1a is installed is safe.

  On the other hand, as a result of the determination in S203, when the route detection signal indicates that the evacuation route is dangerous, the control unit 16 drives the third light source 17 (Step S205). The red laser light emitted from the third light source 17 propagates to the light guide 31 of the display unit 13. The red laser light incident on the light guide 31 is repeatedly reflected in the light guide 31 and diffused, and then emitted from the display surface of the display panel 35 via the diffusion plate 33 and the prism sheet 34.

  FIG. 21 is a diagram showing an emission spectrum in a display area of the display unit shown in FIG. For example, as shown in the red semiconductor laser spectrum of FIG. 21, the red laser light has a very narrow spectral line width and a wavelength position near 640 nm. Therefore, the red laser light transmits through the white light transmitting region 37a but does not transmit through the green transmitting region 37b, so that red light is emitted from the display region 36 of the display panel 35.

  Since the display color of the display panel 35 is red, it is possible to make the evacuee recognize that the evacuation route where the lighting device 1a is installed is dangerous. Further, the red laser light, like the green laser light, generates a speckle pattern as shown in FIG. 8 on the surface of the display panel 35 and on the human retina. This speckle pattern is extremely noticeable from a distance.

  In the second embodiment, the case has been described where the detector 18 is provided in the lighting device 1a. However, the detector 18 may be provided separately from the lighting device 1a. In this case, the detector 18 and the control unit 16 only need to include a unit that transmits and receives a signal via a wired or wireless communication unit. In the second embodiment, the case where the detector 18 detects heat has been described. However, the detector 18 does not necessarily detect heat. The detector 18 may be any detector that detects at least one of heat, flame, and smoke in order to detect whether the evacuation route is dangerous. Further, the detector 18 may have a function of outputting a visibility detection signal indicating that the visibility of the display unit 13 needs to be improved to the control unit 16.

  The lighting device 1a according to the second embodiment drives the first light source 11 when the evacuation route is determined to be safe based on the route detection signal indicating whether the evacuation route facing the display unit 13 is safe. If it is determined that the evacuation route is dangerous, the third light source 17 is driven.

  Conventionally, even if an evacuee can recognize the guide light, the evacuation route where the guide light is installed may be dangerous. In this case, there is a possibility that guidance by the guide light may not be safe for evacuees. Further, even if the conventional lighting device determines that the evacuation route is dangerous and turns off the light, it cannot warn the evacuee that the evacuation route is dangerous. On the other hand, the lighting device 1a according to the second embodiment changes the color of the light emitted from the display unit 13 when the evacuation route is safe and when it is dangerous, so that the evacuees can safely perform evacuation safely. The route can be guided by color. Therefore, it is possible to provide the lighting device 1a having high visibility and safety for a person.

  In the second embodiment, the light source unit 20a has been described with reference to FIGS. 14 to 18. However, the light source unit 20a may be applied to the light source unit 20 of the lighting device 1 of the first embodiment. In this case, it is not necessary to provide the third light source 17 in the light source unit 20a.

  Further, in the first and second embodiments, the case where the lighting devices 1 and 1a are guide lights and emergency lights has been described, but the lighting devices 1 and 1a are not limited to the guide lights and emergency lights. The lighting devices 1 and 1a are used for various traffic signs, aerospace applications, ship applications, etc., various types of warning devices such as rotary and blinking types, and lighting devices for distant information such as signboard lighting. Can be applied to The illumination devices 1 and 1a described in Embodiments 1 and 2 can be applied to a technology for irradiating illumination light using coherent light to a distant place.

  1, 1a lighting device, 11 first light source, 12 second light source, 13 display unit, 14 regular power supply, 15 emergency power supply, 16 control unit, 17 third light source, 18 detector, 20, 20a light source unit, 21 LED Substrate, 22 relay holder, 23 holder, 31 light guide, 32 reflector, 33 diffuser, 34 prism sheet, 35 display plate, 36 display area, 37a white light transmission area, 37b green transmission area, 111 escape hole, 112 connector, 121 electrode pin, 122 through screw hole, 123 screw, 124 through hole, 131 socket hole, 132 screw hole, 133 wiring guide.

Claims (7)

A first light source that emits coherent light;
A second light source that emits incoherent light;
A display unit that emits the coherent light emitted from the first light source and the incoherent light emitted from the second light source;
A control unit that controls driving of the first light source and driving of the second light source;
Lighting device having: The controller is
The lighting device according to claim 1, wherein it is determined whether or not the situation requires improvement in the visibility of the display unit, and one of the first light source and the second light source is driven. The display unit is
A light guide that guides the coherent light and the incoherent light;
The lighting device according to claim 1, further comprising: a display plate configured to generate a speckle pattern from the coherent light incident from the light guide. The coherent light emitted by the first light source further includes a third light source that emits coherent light having a different wavelength,
The controller is
It is determined whether or not the evacuation route around the display unit is safe. If the evacuation route is determined to be safe, the first light source is driven. If the evacuation route is determined to be dangerous, the third evacuation route is determined. The lighting device according to claim 1, wherein the lighting device drives a light source. The first light source is a green laser;
The second light source is a white light emitting diode,
The third light source is a red laser;
The lighting device according to claim 4, wherein the display unit has a display plate including a green transmission region and a white light transmission region. An emission wavelength of the first light source is in a wavelength range of 495 to 570 nm, and a full width at half maximum of an emission spectrum is 10 nm or less;
The emission wavelength of the third light source is in a wavelength range of 620 to 750 nm, and the full width at half maximum of the emission spectrum is 10 nm or less.
The lighting device according to claim 4. The first light source and the third light source are semiconductor lasers;
The lighting device according to claim 4.

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