JP7664507B2 - Lighting systems, street lights - Google Patents

Description

This disclosure relates to a lighting system and street light that controls illumination light in conjunction with a projector.

Evacuation guidance systems using projectors are known and are disclosed, for example, in Patent Document 1.

The evacuation guidance system disclosed in Patent Document 1 uses a projector to project evacuation guidance information onto a specified location in the event of a disaster such as a fire.

JP 2004-329390 A

However, the evacuation guidance system using the projector described in Patent Document 1 does not control the illuminance of the background of the projector's projection image on the irradiation surface including the projection area of the projector that projects the specified information to be lower than the illuminance outside the projection area of the projector. This causes an issue that the image projected by the projector may be difficult to distinguish.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a lighting system that can improve the visibility of an image projected by a projector.

The lighting system of the present invention has a projector, a lighting unit, and a control unit that controls the lighting unit, and when the illuminance of a lighting unit irradiation area, which is an area outside the projection direction of the projector and is irradiated with the light from the lighting unit, is defined as ambient illuminance, and the illuminance of an area onto which a projected image from the projector is projected, which is the illuminance when the projector projects an all-white pattern, is defined as projector projection area illuminance, the control unit controls the magnitude of the ambient illuminance relative to the projector projection area illuminance based on a recommended illuminance ratio classification that is predefined for each projection type of the projection content of the projector .

By using the lighting system according to the present invention, it is possible to improve the visibility of the projected image.
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FIG. 1 is a perspective view of a lighting system according to an embodiment ; 1 is a top view of a lighting system according to an embodiment; FIG. 2 is a schematic diagram showing a light distribution curve of light emitted from a lighting unit in a vertical plane including a projector projection direction of the lighting system according to the embodiment; FIG. 1 is an enlarged view of a lighting unit equipped with a direction control unit according to an embodiment; FIG. 1 is an enlarged view of a lighting unit provided with a light control film according to an embodiment of the present invention; A control block diagram of a lighting system according to an embodiment. FIG. 11 is a perspective view of a lighting system according to a second modified example of the embodiment; FIG. 13 is a top view of a lighting system according to a second modified example of the embodiment. A graph showing the percentage of subjects who judged the visibility to be at an acceptable level for each projected image when the illuminance ratio R value was changed. A graph showing the percentage of subjects who judged the visibility to be at a good level for each projected image when the illuminance ratio R value was changed. A table showing the recommended and acceptable ranges of illuminance ratio R for each projected image FIG. 1 is a control block diagram of a lighting system according to a first modified example of an embodiment.

The following embodiments are described with reference to the drawings. Note that the following embodiments are all comprehensive or specific examples. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components shown in the following embodiments are merely examples and are not intended to limit the present invention. Furthermore, among the components in the following embodiments, components that are not described in an independent claim that represents the highest concept are described as optional components. Furthermore, each figure is a schematic diagram and is not necessarily a precise illustration. Furthermore, in each figure, substantially the same configuration is given the same reference numeral, and duplicated explanations may be omitted or simplified.

(Embodiment)
(Lighting System)
A lighting system according to an embodiment will be described with reference to Figs. 1 to 7. Fig. 1 is a perspective view of a lighting system according to an embodiment. Fig. 2 is a top view of a lighting system according to an embodiment. Fig. 3 is a schematic diagram showing a light distribution curve of light irradiated by a lighting unit in a vertical plane including a direction in which a projector projects, in a lighting system according to an embodiment. Fig. 4a is an enlarged view of a lighting unit equipped with a direction control unit according to an embodiment. Fig. 4b is an enlarged view of a lighting unit equipped with a light control film according to an embodiment. Fig. 5 is a control block diagram of a lighting system according to an embodiment. Fig. 6 is a perspective view of a lighting system according to a second modification. Fig. 7 is a top view of a lighting system in the second modification.

As shown in FIG. 1, the lighting system 1 has a lighting unit 2, a projector 4, and a control unit 3. The lighting unit 2 is supported by a pole 5, and the projector 4 is contained within the lighting unit 2. The control unit 3 controls the lighting unit 2 and the projector 4.

The lighting system 1 according to this embodiment is assumed to be implemented as a street light. Therefore, the pole 5 is installed on the ground outdoors. Of course, the present invention may be implemented in various lighting fixtures other than street lights.

The lighting system 1 also includes a camera 10 that is a surrounding information acquisition unit. The control unit 3 can control the lighting unit 2 and the projector 4 based on surrounding information such as passersby and passing vehicles sensed by the camera 10. The lighting system 1 also includes a signal receiving unit 3c that receives a control signal for controlling at least one of the lighting unit 2 and the projector 4. For example, the signal receiving unit 3c receives disaster prevention evacuation information, and based on the received information, the control unit 3 can control the projector 4 to display an evacuation route.

(Lamp section)
The lighting unit 2 is provided so as to be supported by a pole 5. The lighting unit 2 includes a control unit 3 and a projector 4 therein.

The lighting unit 2 mainly emits lighting unit illumination light in a downward direction rather than horizontally, illuminating the lighting unit illumination area 6. The projector 4 projects a projection image onto the projector projection area 8. The projector projection area 8 is included in the lighting unit illumination area 6. The lighting unit illumination area 6 further includes therein a lighting unit illumination light control area 7. The lighting unit illumination light control area 7 includes the projector projection area 8. The control unit 3 provided inside the lighting unit 2 controls the lighting unit illumination light so that the lighting unit illumination light illuminating the lighting unit illumination light control area 7 is lower when the projector 4 is operating compared to when the projector 4 is not operating.

Fig. 4a shows an enlarged view of the lighting unit with the direction control unit according to the embodiment. The lighting unit 2 has a housing 2f, a lighting unit main body 2a, 12 LED (Light Emitting Diode) light emitting units 2b, a power source 2c, and a control unit 3. The lighting unit main body 2a is provided inside the housing 2f. The power source 2c and the control unit 3 are provided inside the lighting unit main body 2a. The lighting unit main body 2a has a convex cone shape on the lower side, and the LED light emitting units 2b are provided on the outer surface of the lighting unit main body 2a. In addition, a translucent cover 2h is provided to cover the LED light emitting units 2b. The translucent cover 2h is transparent and is, for example, resin or glass. Furthermore, the translucent cover 2h may have a diffusive property depending on the application of the lighting system.

The lamp unit 2 also has a direction control unit 2d for controlling the lamp unit irradiation light emitted from the LED light-emitting unit 2b and irradiating the lamp unit irradiation light control area 7. The LED light-emitting unit 2b is composed of a metal base 2b1 and an LED package 2b2. The base 2b1 may be made of resin or a glass composite material. The LED package 2b2 is an SMD (Surface Mounted Device) type, and emits white light by combining a blue LED light-emitting element with a YAG-based phosphor filled inside the resin package.

Alternatively, a red phosphor may be added to the YAG phosphor to adjust the color rendering performance and chromaticity. Also, a light emission method may be used in which an LED element that emits light in the ultraviolet range is combined with multiple types of phosphors that emit light in the visible light range to emit white light. Furthermore, the LED package 2b2 is not limited to the SMD type, and a COB (chip on board) type may also be used.

The LED package does not have to be a type that emits white light, but may be a combination of single-color LEDs of R (red), G (green), and B (blue). In this case, if the control unit 3 is able to control the RGB ratio of the light emitted from the LED light-emitting unit 2b, it becomes possible to control not only the intensity but also the chromaticity of the light irradiating the lamp unit irradiation light control area 7.

Of the twelve LED light-emitting units 2b, two LED light-emitting units 2b that emit light in approximately the same direction as the projector projection direction are rotatably supported by a direction control unit 2d provided on the lamp unit main body 2a. The direction control unit 2d has a motor as a power source, and rotates upon receiving a control signal from the control unit 3. This makes it possible to control the intensity of the lamp unit illumination light that illuminates the lamp unit illumination light control area 7.

A movable lens 2g may also be used as a means for controlling the intensity of the light emitted by the lamp unit. The lens 2g is made of resin or glass. The lens 2g is provided in the direction in which light is emitted from the LED light-emitting unit 2b toward one or more of the 12 LED light-emitting units 2b. The lens 2b can be rotated by a motor, and can control the light emitted by the lamp unit.

The lens 2g controls the light emitted from the LED light-emitting unit 2b to a narrow angle. If the LED light-emitting unit 2b is a general SMD type or COB type, the light distribution characteristic is Lambertian, and the half light distribution angle is approximately 120°. By providing the lens 2g, the half light distribution angle can be made narrower, for example to approximately 60°.

This makes it easier to achieve the intended light distribution when the projector 4 is in operation and when it is not in operation. Alternatively, a reflective member may be used to control the light emitted by the lamp unit. In this case, the angle and position of the reflective member may be electrically controlled to control the light emitted by the lamp unit.

Alternatively, it is possible to control the light emitted by the lamp unit that illuminates the lamp unit light control area 7 by using a light control film 2e that electrically controls the light transmittance. As the light control film 2e, for example, one that has liquid crystal molecules inside and can control the direction of the liquid crystal molecules by applying an electric field can be used. In this case, if the orientation direction of the liquid crystal molecules is non-uniform, the light control film 2e is opaque, and if the orientation direction of the liquid crystal molecules is uniform, the light control film 2e has transparent properties.

The light control film 2e is arranged, for example, as shown in FIG. 4b, in the light irradiation direction of the LED light-emitting unit 2b, along the outer periphery of the translucent cover 2h. The light control film 2e is arranged in the lamp unit 2 so as to selectively control the lamp unit irradiation light in the lamp unit irradiation light control area 7, and electrically controls the transmittance of the illumination light based on control information from the control unit 3.

In addition, the light control film 2e may be one capable of selectively controlling the transmittance of wavelengths in the light irradiated from the lamp unit 2. This makes it possible to control not only the intensity but also the chromaticity of the light irradiating the lamp unit irradiation light control region 7.
(pole)
The pole 5 is driven into the road surface 11 and fixed vertically, has a diameter of 10 cm, and is made of metal. The lighting unit 3, including the projector 4 contained in the lighting unit 3, is fixed to the pole 5 so as to be located within a range of 2.5 m to 2.7 m from the ground. By installing it at a height of 2.5 m, it is possible to reduce the risk of passersby touching it or of passing vehicles contacting it, and to prevent malfunctions and malfunctions. In addition, since it is located at a height of 2.7 m or less, installation and maintenance are relatively easy. Here, the material and size of the pole 5 are generally appropriately selected in consideration of durability, strength, appearance, etc. In addition, the lighting system 1 may be fixed to a horizontal pole or the outer wall of a building, other than the method of fixing it to the vertical pole 5.
(Projector)
The projector 4 is attached to the pole 5 via the attachment portion 5a so as to be contained in the lighting unit 2. The projector 4 may be fixed to the lighting unit 2. Since the image projection unit of the projector 4 is contained in the housing 2f, it has a neat appearance and is preferable, but it does not necessarily have to be contained in the lighting unit 3.

The projector 4 has an image projection unit and a projector power supply unit, and the image projection unit has a light source unit, an image generation unit, and a projection optical system. The image projection unit further has an opening for projecting an image. The projection optical system is provided in the opening. The image generation unit generates a projection image based on the generation information. The light source unit supplies the image generation unit with light required to generate the projection image. The projection optical system performs optical conversion such as focusing and zooming on the image supplied from the image generation unit. The projection optical system faces the opening, and an image is projected from the opening. The image projection unit obtains power from the projector power supply unit, and projects the projection image generated by the image generation unit through the opening. The projector 4 may also include a drive unit that changes the projection direction of the image projection unit.

The control unit 3 controls the projector 4 to determine the image to be projected by the projector 4 and the timing of projection, in accordance with information acquired by a camera 10, which is a peripheral information acquisition unit described later.
(Light emitted from the lamp unit)
2 shows the distribution of the lamp unit illumination light emitted from the lamp unit 2 toward the ground, and the projector projection area 8 onto which the projected image is projected from the projector 4. The lamp unit illumination area 6 is distributed widely in a long and narrow range along the road, centered directly below the lamp unit 2. In the lamp unit illumination area 6, the lighting system 1 ensures a certain illuminance value required for a street light. For example, JIS Z9100 (Road Lighting Standard) specifies that the illuminance value required for roads in residential areas with heavy traffic is 5 lx or more.

Figure 3 shows the light distribution curve of the light irradiated by the lamp unit in a vertical plane including the projector projection direction (a plane that passes through line A in Figure 2 and is perpendicular to the ground). When the projector 4 is not in operation, in order for the illuminance of the lamp unit irradiation area 6 to satisfy a required constant illuminance value, the light distribution curve 31 has a maximum luminous intensity in direction B, which illuminates a diagonal distance as shown in Figure 3, and the luminous intensity decreases as it moves directly downward. For example, in the example of Figure 3, the luminous intensity in direction C, which is directly downward, is about half the luminous intensity in direction B.

The reason why the light distribution curve 21 of the light emitted by the lamp unit when the projector 4 is not in operation has such characteristics is to ensure a constant illuminance value required on the road surface 11 even at a position away from directly below the lamp unit 2, where the distance from the lamp unit 2 to the road surface 11 becomes longer. In general, even if the distance to the illuminated surface is long, it is possible to increase the illuminance by increasing the luminous intensity in the illumination direction.

On the other hand, since the distance from the lamp unit 2 to the ground 11 is relatively short in the vicinity directly below the lamp unit 2, the required constant illuminance value can be met even if the luminance in the direction C directly below is kept low. Conversely, if the luminance in the direction C is too high, the illuminance in the vicinity directly below the lamp unit 2 will be unnecessarily high, which may lead to a decrease in the uniformity of the illuminance on the road surface 11. In this case, visibility will be reduced for pedestrians, which is undesirable.

However, the light distribution curve 21 of the light irradiated from the lighting unit when the projector 4 is not in operation can be appropriately selected from various other shapes depending on the purpose of use, the installation environment, and the like.
(Control Unit)
When the projector 4 is not in operation, the control unit 3 controls the lighting unit 2 so that the illuminance of the lighting unit irradiation area 6 exceeds the required certain illuminance value as described above. At this time, the control unit 3 controls without distinguishing between the inside and outside of the boundary of the lighting unit irradiation light control area 7. On the other hand, when the projector 4 is in operation, the control unit 3 controls by distinguishing between the inside and outside of the boundary of the lighting unit irradiation light control area 7 so that the illuminance of the lighting unit irradiation light control area 7 is lower than the illuminance of the lighting unit irradiation area 6 around the lighting unit irradiation light control area 7.

Furthermore, when focusing only on the lamp unit irradiation light control area 7, the lamp unit 2 can be controlled so that the lamp unit irradiation light irradiating the lamp unit irradiation light control area 7 is lower when the projector 4 is operating than when the projector 4 is not operating. On the other hand, the illuminance of the lamp unit irradiation area 6 other than the lamp unit irradiation light control area 7 can be controlled so that the illuminance is the same as when the projector 4 is not operating, even when the projector 4 is operating.

Here, the lighting unit illumination control area 7 includes the projector projection area 8, which is the area onto which the image projected from the projector 4 is projected. In other words, this control makes it possible to keep the background illuminance of the projected image low when the projector 4 is in operation, thereby improving the visibility of the projection information.

In addition, this control allows the illuminance in an area that is located outside the lighting unit illumination light control area 7 and is included in the lighting unit illumination area 6 to be maintained at the same level as when the projector 4 is not operating, even when the projector 4 is operating. In other words, the control of the control unit 3 makes it possible to improve the visibility of the projected content of the projector 4 while maintaining the function of the lighting device to brightly illuminate the surroundings.

When controlling the illumination light emitted from the lighting unit 2, the control unit 3 can perform mechanical control such as the following. Specifically, when the control unit 3 receives information that the projector 4 has been operated, it controls the rotation of the direction control unit 2d that supports the LED light emitter 2b so that the LED light emitter 2b reduces the lighting unit illumination light that illuminates the lighting unit illumination light control area 7. At this time, the light distribution curve 22 of the lighting unit illumination light when the projector 4 is operating has a lower luminous intensity value than the light distribution curve 21 of the lighting unit illumination light when the projector 4 is not operating, within a range that includes the illumination direction of the lighting unit illumination light control area 7.

As a mechanical control method, a method of controlling the optical system may be adopted. Specifically, when the projector 4 is operated, the lens 2g may be rotated and the illuminance of the lighting unit irradiation light control area 7 may be reduced.

As a means for locally controlling the light emitted by the lamp unit, in addition to a method for mechanically controlling the LED light-emitting unit 2b, a method for controlling the power input to the LED package 2b2 that emits light in the direction of the lamp unit light control area 7 may be adopted. Alternatively, as a means for locally controlling the light emitted by the lamp unit, the light control film 2e described above that electrically controls the light transmittance may be used.

When controlling the light emitted from the lamp unit to the lamp unit light control area 7, it is possible to control not only the amount of light but also the chromaticity. For this purpose, it is particularly preferable to control the power input to the LED light-emitting unit 2b or to use the light control film 2e.

For example, in the case of the LED light-emitting unit 2b, when it is configured with a combination of R (red), G (green), and B (blue), the desired chromaticity of the illumination light can be selected by adjusting the power input to the LEDs of each color and adjusting the emission intensity. Also, when the light control film 2e is used, the desired chromaticity of the illumination light can be selected by selectively adjusting the transmittance of a predetermined wavelength range.

In this way, not only is it possible to control the intensity of the light emitted by the lamp unit in the lamp unit illumination area 6 according to the content of the projected image, but it is also possible to control the chromaticity, thereby making the projected image stand out more and improving visibility.

As shown in FIG. 5, the control unit 3 also has a lighting control unit 3a and a projector control unit 3b that communicate with each other. The size, brightness, and color of the projected image may change, but because the lighting control unit 3a and the projector control unit 3b communicate with each other, it is possible to control the projection image to improve its visibility while suppressing a decrease in the surrounding brightness in response to the change.

For example, when the size of the projected image increases, the lighting unit illumination light control area 7 is enlarged accordingly, and conversely, when the size of the projected image decreases, the lighting unit illumination light control area 7 is reduced accordingly, thereby enabling optimal control.

Furthermore, within the lighting unit illumination area 6, in areas away from the projector projection area 8, the lighting unit illumination light is not reduced even when the projector 4 is operating, so that the illuminance is the same when the projector 4 is operating as when the projector 4 is not operating, ensuring the necessary function of a lighting system of providing bright illumination.
(Acquisition of external information)
The signal receiving unit 3 c receives various information from the outside, and the projector 4 can project the corresponding projection information onto a projection surface such as the road surface 11 .

For example, the signal receiving unit 3c receives the disaster prevention and evacuation information described above, and the control unit 3 can control the lighting unit 2 and the projector 4 in response to this received signal. For example, the projector 4 can project evacuation information, such as evacuation locations and evacuation routes, onto the road surface 11.

The external receiving unit 33 can also receive information informing of the approach of a suspicious person. In response to this received signal, the control unit 3 controls the lighting unit 2 and the projector 4, and the projector 4 can project crime prevention alert information onto the road surface 11. Alternatively, the signal receiving unit 3c can receive traffic information that predicts road conditions. In response to this received signal, the projector 4 can project traffic guidance information to avoid congestion onto the road surface 11.

The control unit 3 can also control the lighting unit 2 and the projector 4 based on the surrounding information acquired by the camera 10, which is the surrounding information acquisition unit. For example, the control unit 3 can control the projector 4 to project information related to traffic control onto the road surface 11 at the required timing based on the surrounding road traffic information acquired by the camera 10. Examples of information related to traffic control include road markings that distinguish the direction of travel and speed limit information.

The control unit 3 can control the lighting unit 2 and the projector 4 based on the attributes of passersby identified from the information detected by the camera 10. For example, the facial expressions and emotions of passersby can be identified by the AI installed in the camera 10, and a lighting space that corresponds to them can be created.

More specifically, if the AI identifies a passerby as feeling "happy," it can create a lighting space that further enhances that emotion. Also, advertisements prepared in advance according to attributes such as the gender and age of the passerby may be projected onto the road surface 11. Furthermore, if suspicious behavior by a passerby is detected, it is also possible to project a projection image that alerts other passersby in the vicinity.

The control unit 3 is, for example, a microcomputer or a CPU (Central Processing Unit).
The control unit 3 is configured to include a control unit (controller unit) and is equipped with a memory unit. It is also possible to determine the content of the projection image according to schedule information previously stored in the memory of the control unit 3. For example, in consideration of an annual schedule, if it is Christmas time, content suitable for Christmas can be projected. Alternatively, in schedule control for a day, it is possible to project a predetermined projection image at a predetermined time. For example, in the evening, it is possible to project an advertisement for a restaurant, or a clock display to notify the time itself.

The control unit 3 can also control the lighting unit 2 and the projector 4 based on surrounding weather information acquired by the signal receiving unit 3c. Alternatively, the control unit 3 may control the projector 4 based on weather information acquired by the camera 10. For example, the image to be projected by the projector 4 may be determined based on the movement of distant rain clouds detected by the camera 10. As another means, the image to be projected by the projector 4 can be determined based on the measurement value of a thermo-hygrometer (not shown) built into the camera 10.

The surrounding information acquisition unit is not limited to the camera 10. For example, the surrounding information acquisition unit may use a human sensor or a vibration detector as a sensing device that acquires surrounding information. When a human sensor is used, the control content of the lighting unit 2 and the projector 4 can be determined according to the detection information of people around the lighting system 1. Specifically, it is possible to control the lighting unit to set the light emitted by the lighting unit low in advance when no people are detected, and to increase the illuminance of the light emitted by the lighting unit when a person is detected.

Alternatively, projector 4 can be controlled not to operate when no person is detected, and to operate when a person is detected. In addition, when a vibration detector is used, projector 4 can be controlled to project disaster prevention and evacuation information when vibrations caused by an earthquake are detected.

Furthermore, the control unit 3 can determine the control content of the lighting unit 2 and the projector 4 based on information about the surrounding illuminance, i.e., the illuminance outside the range where the irradiation of the light emitted by the lighting unit is mainly expected (for example, the installation location of the camera 10). For example, if the surroundings are relatively bright, control is possible such that the irradiation intensity of the projected image is increased in order to improve the visibility of the projected image. Conversely, if the surroundings are very dark, sufficient visibility can be ensured even if the irradiation intensity of the projected image is kept low, so control is possible to suppress excessive power input. (Variation 1)
In the above embodiment, the control unit 3 controls the luminance of the light emitted from the lighting unit 2 in accordance with the operating state of the projector 4, but the control contents of the control unit 3 are not limited to this. For example, in addition to controlling the light emitted from the lighting unit 2, the control unit 3 can also improve the visibility of the projection information by controlling the projector luminance, which is the luminance of the image projected by the projector 4.

In general, the visibility of the projection information can be improved by reducing the ratio of the background illuminance of the projection image to the illuminance of the projection image. In the present invention, the ratio of the background illuminance of the projection image to the illuminance of the projection image can also be reduced by controlling the projector luminance, thereby improving the visibility of the projection information.

The following describes how to control the ratio of the light emitted by the lighting unit to the light projected by the projector in order to improve the visibility of the projection information.

Here, the ambient illuminance is the illuminance at one point in the lighting unit irradiation light control area 7 that is a predetermined distance (e.g., 5 cm) away from the projector projection area 8. The ambient illuminance may be the average illuminance at multiple points in the area that is a predetermined distance away from the projector projection area 8.

The illuminance at the center of the projector projection area 8 when the projector 4 projects an all-white pattern is defined as the projector projection area illuminance. Note that the average illuminance of multiple points in the projector projection area 8 may be defined as the projector projection area illuminance.

The control unit 3 changes at least one of the luminance of the lighting unit illumination light emitted from the lighting unit 2 and the projector luminance when the projector 4 projects an all-white pattern, depending on the projection content projected by the projector 4. By such control, the ratio between the environmental illuminance and the illuminance of the projector projection area can be controlled. By controlling this ratio, the visibility of the projection content can be improved more effectively.

The appropriate ratio between the environmental illuminance and the projector projection area illuminance differs for each type of projection image. In other words, by controlling the ratio between the environmental illuminance and the projector projection area illuminance within an appropriate range depending on the type of projection image, it is possible to more effectively improve the visibility of the projection content. If the magnitude of the environmental illuminance relative to the projector projection area illuminance is defined as the illuminance ratio R value, the inventors have derived this appropriate illuminance ratio R value through subjective evaluation, which will be explained below using Figures 8 to 10, etc.

Here, FIG. 8 is a graph showing, for each projected image, the percentage of the total number of subjects who judged that the visibility was at an acceptable level when the illuminance ratio R value was changed. FIG. 9 is a graph showing, for each projected image, the percentage of the total number of subjects who judged that the visibility was at a good level when the illuminance ratio R value was changed. FIG. 10 is a table showing the recommended and acceptable ranges of the illuminance ratio R value for each projected image.

Generally, the smaller the illuminance ratio R value, the better the visibility of the projected image. The required illuminance ratio R value varies depending on the type of image. For example, compared to a natural daytime landscape (such as sunlight filtering through trees), which is relatively bright and does not require detailed image information, an image that is detailed and requires distinction between subtle color differences (such as a photo of wool) requires a smaller illuminance ratio R value. Furthermore, an image that is dark and contains detailed image information (such as a photo of a starry sky) requires an even smaller appropriate illuminance ratio R value.

First, the types of projected images were classified into the following types A to D.
・Type A: Natural scenery during the day. (Typical example: sunlight filtering through the trees)
・Type B: Images that present information such as figures and tables. (Typical examples: graphs)
・C type: Images that require the identification of delicate and relatively colorful projected objects. (Representative example: wool)
Type D: An image that is generally dark with relatively small areas of high brightness scattered throughout. (Typical example: starry sky)
The representative images of types A to D were presented to the subjects while changing the illuminance ratio R value, and the subjects were asked to judge whether the visibility of the presented images was at an acceptable level or a good level.

The total number of subjects was 100 (20 subjects, each with 5 tests). In addition, acceptable visibility was judged based on whether or not the subjects could recognize the general content of the projected image when they observed the projected image. Furthermore, good visibility was judged based on whether or not the subjects could fully grasp the information contained in the projected image when they observed the projected image.

The percentage of subjects who judged the visibility of each presented image to be at or above an acceptable level was calculated. The results are shown in the graph in Figure 8. Similarly, Figure 9 shows the percentage of subjects who judged the visibility to be at a good level when the illuminance ratio R value was changed for each representative example image of types A to D.

The illuminance ratio R value that 75% of all subjects judged to be acceptable was set as the upper limit of the allowable value. The illuminance ratio R value that 90% of all subjects judged to be acceptable was set as the lower limit of the allowable value and the upper limit of the recommended value. The illuminance ratio R value that 85% of all subjects judged to be good was set as the lower limit of the recommended value. Here, the allowable value means a level that can be used without problems in actual use, and the recommended value means a level at which the viewer can better grasp the contents of the projected image when recognizing it.

The range of allowable values and recommended values for each projection image, A to D types derived by the above method are as follows (see Figure 10). Here, the illuminance ratio R values corresponding to each projection image A to D are classified into sections a to d.

When the projected image is Class A, the illuminance ratio R value falls under category a, and the subjective evaluation results showed that the allowable illuminance ratio R value for a clearly visible projected image is 0.34 to 0.51, and the recommended value for ensuring even higher visibility is 0.08 to 0.34.

For Type B, the illuminance ratio R value falls under category b, and subjective evaluation results showed that the allowable illuminance value R value for a projected image to be clearly visible is 0.25 to 0.30, with the recommended value for even higher visibility being 0.08 to 0.25.

For Type C, the illuminance ratio R value falls under category c, and the permissible illuminance value R value for a projected image to be clearly visible is 0.08 to 0.13, and the recommended value for ensuring even higher visibility is 0.014 to 0.08, as derived from the subjective evaluation results.

For Type D, the illuminance ratio R value falls under category d, and in order for the projected image to be clearly visible, the allowable illuminance value R value is 0.03 to 0.05, and the recommended value for ensuring even higher visibility is 0.005 to 0.03, as derived from the subjective evaluation results.

The control unit 3 controls at least one of the luminance of the light emitted from the lighting unit 2 and the projector luminance when the projector 4 projects an all-white pattern so that the luminance falls within the above range, thereby more effectively improving the visibility of the projected image.

The control unit 3 may control the lamp unit illumination light emitted from the lamp unit 2 and the projector luminance so as to conform to a predefined illuminance ratio R value for each type of projection image projected by the projector 4. For example, when projecting an image of type C, such as wool, the control unit 3 can control the lamp unit illumination light emitted from the lamp unit 2 and the projector luminance so that the illuminance ratio R value is within the recommended range of 0.014 to 0.08.

In this embodiment, there are multiple recommended illuminance ratio categories for each image type of illuminance ratio R value, ranging from 0.08 to 0.34 (category a) to 0.006 to 0.03 (category d). Of these, the ratio between the upper limit value of the category with the highest illuminance ratio, i.e., 0.34, and the upper limit value of the category with the lowest illuminance ratio, i.e., 0.03, is more than twice. By controlling in this way, it becomes possible to effectively improve visibility for various types of projected images that require different illuminance ratio R values.

The lighting system 1 can appropriately change the illuminance ratio R value to a more appropriate range based on the observer's evaluation results, and can automatically determine the projection content of the projected image and automatically set an appropriate range for the illuminance ratio R value even if the illuminance ratio R value is not known in advance. These controls will be explained using FIG. 11. FIG. 11 is a control block diagram of a lighting system according to Variation 1 of this embodiment. As shown in FIG. 11, the lighting system 1 includes an evaluation result acquisition unit 31 and a projection content determination unit 32.

The lighting system 1 can appropriately change either the upper limit or the lower limit of the allowable value of the illuminance ratio R value, or both, based on the observer's evaluation result. Similarly, it can appropriately change either the upper limit or the lower limit of the recommended value, or both, based on the observer's evaluation result. It can also appropriately change the category (category a to category d) to which the projected image belongs, based on the observer's evaluation result. Furthermore, it can also appropriately change the light actually emitted by the lamp unit and the projector luminous intensity within the same category.

That is, the lighting system 1 includes an evaluation result acquisition unit 31 that acquires the evaluation results of the viewer's ease of viewing for each type of projection image as shown in FIG. 11, and the control unit 3 can appropriately change the allowable value and recommended value of the illuminance ratio R value based on the evaluation results acquired by the evaluation result acquisition unit 31. This makes it possible to control the illuminance ratio R value in a more appropriate manner to improve the visibility of the projection image while reflecting the observer's evaluation results, even after the user has started actual use.

In the lighting system 1, the projection content of the projection image projected by the projector 4 may be determined in advance, or the projection content may be determined from time to time based on external information or the like. The lighting system 1 may also include a projection content determination unit 32 that determines the projection content of the projection image projected by the projector 4 as shown in FIG. 11. In this case, for example, when a projection image is projected based on external information and an appropriate illuminance ratio R value cannot be known in advance, a preferable illuminance ratio R value can be determined based on the projection content determination result determined by the projection content determination unit 32. This makes it possible to improve the visibility of a projection image for which an optimal illuminance ratio R value cannot be known in advance.
(Effects, etc.)
Here, the main points of the lighting system 1 according to the embodiment will be described again.

The lighting system 1 according to the embodiment includes a projector 4, a lighting unit 2, and a control unit 3. The control unit 3 is for controlling the lighting unit 2. The control unit 3 controls the lighting unit illumination light emitted from the lighting unit 2 according to the operating status of the projector 4 and the projection content.

By using the lighting system 1 having the above configuration, it is possible to control the light emitted by the lighting unit in the lighting unit light control area 7, making the image projected by the projector 4 stand out and improving visibility.

In addition, in the lighting system 1 according to the embodiment, the control unit 3 may separately control the light emitted by the lamp unit in a specific irradiation direction (the direction toward the lamp unit irradiation light control area 7) and other irradiation directions depending on the operating status of the projector 4 and the projection content.

As described above, when the projector 4 is in operation, the light emitted by the lamp unit is controlled separately in the lamp unit light control area 7 and in the area of the lamp unit illumination area 6 other than the lamp unit light control area 7, making it possible to make the projected image stand out more and improving visibility.

In addition, in the lighting system 1 according to the embodiment, the control unit 3 may separately control the light emitted by the lighting unit in an illumination direction that includes at least a part of the projection direction of the projector 4 and in other directions depending on the operating status of the projector 4 and the projection content.

As described above, when the projector 4 is in operation, the light emitted by the lighting unit can be controlled separately in an illumination direction that includes at least a part of the projection direction and in other directions, making the projected image stand out more and improving visibility.

In the lighting system 1 according to the first modified example of the embodiment, the control unit 3 may control the ratio between the ambient illuminance and the projector projection area illuminance in response to the projection content projected by the projector 4 by changing at least one of the luminance of the lamp unit irradiation light and the projector luminance when the projector 4 projects an all-white pattern. Here, the ambient illuminance is the illuminance of the lamp unit irradiation light control area 7, which is an area outside the projection direction of the projector 4 and is irradiated with the lamp unit irradiation light. In addition, the projector projection area illuminance is the illuminance of the area where the projection image from the projector 4 is projected, and is the illuminance when the projector 4 projects an all-white pattern.

As described above, by changing at least one of the luminous intensity of the light emitted by the lighting unit and the luminous intensity of the projector in response to the projection content, it is possible to improve visibility according to the type of projected image.

In addition, in the lighting system 1 according to the first modified embodiment, the control unit 3 may control the magnitude of the environmental illuminance relative to the projector projection area illuminance to be 0.51 times or less.

As described above, by controlling the magnitude of the environmental illuminance relative to the projector projection area illuminance to be 0.51 times or less, the projected image can be made to stand out more appropriately in a projected image that depicts a natural daytime scene, such as sunlight filtering through the trees, thereby improving visibility.

In addition, in the lighting system 1 according to the first modified embodiment, the control unit 3 may control the magnitude of the environmental illuminance relative to the projector projection area illuminance to be 0.05 times or less.

As described above, by controlling the magnitude of the environmental illuminance relative to the projector projection area illuminance to be 0.05 times or less, it is possible to make the projected image stand out more appropriately and improve visibility for projected images that contain dark and detailed image information, such as a photo of a starry sky.

In addition, in the lighting system 1 according to the first modified example of the embodiment, the control unit 3 may control the ratio between the ambient illuminance and the projector projection area illuminance based on a recommended illuminance ratio classification that is predefined for each projection type of the projection content projected by the projector 4.

As described above, by controlling the ratio between the ambient illuminance and the projector projection area illuminance based on the recommended illuminance ratio classification predefined for each projection type, it is possible to make the projected image stand out more appropriately and improve visibility according to the projected image.

In addition, in the lighting system 1 according to the first modified embodiment, with regard to the recommended illuminance ratio classification, the ratio between the upper limit value of the recommended range of illuminance ratio in the classification with the highest illuminance ratio and the upper limit value of the recommended range of illuminance ratio in the classification with the lowest illuminance ratio may be two or more.

As described above, by setting the upper limit of the range for each recommended illuminance ratio category, it is possible to make the projected image stand out more appropriately and improve visibility for various types of projected images with different brightness and image resolution.

The lighting system 1 according to the first modified embodiment may further include an evaluation result acquisition unit 31 that acquires an evaluation result of the ease of viewing the projection content by the observer. The control unit 3 may then be able to appropriately change the ratio between the ambient illuminance and the projector projection area illuminance to a more preferable numerical range based on the evaluation result acquired by the evaluation result acquisition unit 31.

As described above, by appropriately changing the ratio between the ambient illuminance and the projector projection area illuminance to a more preferable numerical range based on the evaluation results acquired by the evaluation result acquisition unit 31, it is possible to improve the visibility of the projected image at any time, even after the start of actual use.

In addition, in the lighting system 1 according to the first modified example of the embodiment, the projection content of the projector 4 may be determined in advance.

As described above, by determining the projection content of projector 4 in advance, it becomes possible to more reliably set an appropriate recommended illuminance ratio category for each projection image, making it possible to set the illuminance ratio R value with high precision and improving visibility.

In addition, the lighting system 1 according to the first modified embodiment may include a projection content determination unit 32 that determines the projection content, and the control unit 3 may determine the ratio between the ambient illuminance and the projector projection area illuminance based on the projection content determination result determined by the projection content determination unit 32.

As described above, by providing a projection content determination unit 32 and determining the ratio between the ambient illuminance and the projector projection area illuminance based on the projection content determination result, it is possible to more appropriately highlight the projected image and improve visibility, even for projected images whose contents are not known in advance.

In addition, in the lighting system 1 according to the embodiment, the control unit 3 may control the luminous intensity of the light emitted by the lighting unit according to the operating status of the projector 4 and the projection content.

As described above, by controlling the luminance of the light emitted by the lighting unit according to the operating status of the projector 4, it is possible to make the image projected by the projector 4 stand out and improve visibility.

In addition, in the lighting system 1 according to the embodiment, the control unit 3 may control the luminous intensity of the light emitted from the lamp unit in a specific irradiation direction (toward the lamp unit irradiation light control area 7) when the projector 4 is in operation so that the luminous intensity is lower than when the projector 4 is not in operation.

As described above, when the projector 4 is in operation, if the luminous intensity of the light emitted by the lamp unit in the lamp unit illumination light control area 7 is controlled to be lower than when the projector 4 is not in operation, the illuminance in the lamp unit illumination light control area 7 will be lower. This is because, as long as the positional relationship between the light-emitting unit and the illumination surface is constant, the luminous intensity toward the illumination surface is proportional to the illuminance at the illumination surface. By controlling in this way, it is possible to make the projected image stand out more and improve visibility.

In addition, in the lighting system 1 according to the embodiment, the light emitted by the lighting unit 2 may be controlled by changing the orientation of the light source or optical components provided in the lighting unit 2 depending on the operating status of the projector 4 and the projection content.

As described above, when the projector 4 is in operation, the orientation of the light source (LED light-emitting unit 2b) or the optical member lens 2g or the reflecting member is rotationally controlled, and the optical characteristics of the light emitted by the lamp unit in the lamp unit light control area 7 are controlled separately from the surrounding area of the lamp unit light control area 7, making the projected image stand out more and improving visibility.

In addition, in the lighting system 1 according to the embodiment, the control unit 3 may control the chromaticity of the light emitted by the lighting unit according to the operating status of the projector 4 and the projection content.

As described above, by controlling the chromaticity of the light emitted by the lighting unit according to the operating status of the projector 4 and the projection content, it is possible to make the projected image stand out more and improve visibility.

In addition, in the lighting system 1 according to the embodiment, a light control film 2e whose light transmission characteristics can be electrically adjusted may be used to control the optical characteristics of the light emitted by the lamp unit according to the operating status of the projector 4 and the projection content.

As described above, by using the light control film 2e, whose light transmission characteristics can be electrically adjusted, to control the optical characteristics of the light emitted from the lighting unit, it is possible to make the projected image stand out more and improve visibility.

In addition, in the lighting system 1 according to the embodiment, the lighting unit 2 may have a housing 2f and a light source unit (LED light-emitting unit 2b) connected to the housing 2f, and the image projection unit of the projector 4 may be contained within the housing 2.

As described above, the lighting unit 2 has a housing 2f and a light source unit (LED light-emitting unit 2b) connected to the housing 2f, and the image projection unit of the projector 4 is contained within the housing 2f, so that the lighting system 1 has a neat appearance and a structure that is aesthetically pleasing.

In the lighting system 1 according to the embodiment, the lighting unit 2 and the projector 4 may both be installed at a height of 2.5 m or more from the ground.

As described above, by installing both the lighting unit 2 and the projector 4 at a height of 2.5 m or more above the ground, contact with pedestrians and passing vehicles is prevented, making it possible to reduce breakdowns and malfunctions.

The lighting system 1 according to the embodiment may also have a surrounding information acquisition unit that acquires surrounding information, and the control unit 3 may determine the control content of the luminaire unit 2 based on the information received by the surrounding information acquisition unit.

As described above, the system has a surrounding information acquisition unit such as a camera 10 that acquires surrounding information, and the control unit 3 determines the control content of the lighting unit 2 based on the surrounding information acquired by the surrounding information acquisition unit, making it possible to control the lighting unit 2 based on information about passersby and passing vehicles.

In addition, in the lighting system 1 according to the embodiment, the control unit 3 may determine the control content of not only the luminaire unit 2 but also the projector 4 based on the information received by the surrounding information acquisition unit.

As described above, the system has a surrounding information acquisition unit such as a camera 10 that acquires surrounding information, and the control unit 3 determines the control content of not only the lighting unit 2 but also the projector 4 based on the surrounding information acquired by the surrounding information acquisition unit, making it possible to control the projector 4 based on information about passersby and passing vehicles.

The lighting system 1 according to the embodiment may also have a luminaire control unit 3a that controls the luminaire unit 2 and a projector control unit 3b that controls the projector 4, and the luminaire control unit 3a and the projector control unit 3b may communicate with each other.

As described above, the lighting control unit 3a and the projector control unit 3b communicate with each other, so that the light emitted by the lighting unit can be controlled according to the size and display content of the projected image, thereby more effectively improving the visibility of the projected image.

The lighting system 1 according to the embodiment may also include a signal receiving unit 3c that receives a control signal for controlling at least one of the lighting unit 2 and the projector 4 from the outside.

As described above, by having a signal receiving unit 3c that receives a control signal for controlling at least one of the lighting unit 2 and the projector 4 from the outside, it is possible, for example, to obtain disaster information from the signal receiving unit 3c and project the associated evacuation information or control the optical characteristics of the light emitted by the lighting unit.

In addition, the lighting system 1 according to the embodiment may be provided with a sensing device that automatically detects surrounding information as the surrounding information acquisition unit.

As described above, by providing a sensing device such as a human presence sensor that automatically detects surrounding information, it becomes possible to effectively control the lighting unit 2 and the projector 4. In addition to the human presence sensor, the sensing device may also include a light meter, a thermo-hygrometer, a vibration detector, etc.

The lighting system 1 according to the embodiment may also include a camera 10 as a sensing device.

As described above, by providing the camera 10 as a sensing device, the control content of the lighting unit 2 is determined based on the surrounding information obtained by the camera 10, and it becomes possible to control the lighting unit 2 based on information on passersby and passing vehicles.

In addition, in the lighting system 1 according to the embodiment, the control unit 3 may control the projector 4 based on attribute information including at least one of the number of people in the vicinity, age, sex, facial expression, and emotion, acquired by the surrounding information acquisition unit.

As described above, the control unit 3 controls the projector 4 based on the attribute information of people in the vicinity acquired by the surrounding information acquisition unit, thereby projecting an image that is more suitable for the attributes of the people in the vicinity.

In addition, in the lighting system 1 according to the embodiment, the control unit 3 may determine the control content of the projector 4 based on information about surrounding road traffic acquired by the surrounding information acquisition unit.

As described above, the control unit 3 can project road markings that indicate the direction of travel by controlling the projector 4 based on the information about the surrounding road traffic acquired by the surrounding information acquisition unit.

The lighting system 1 according to the embodiment may also have a memory that stores schedule information, and the control unit 3 may control the lighting unit 2 and the projector 4 based on the schedule information.

As described above, the control unit 3 can select the time to project a projection image by controlling the lighting unit 2 and the projector 4 based on the schedule information stored in the memory. For example, during the Christmas season, a projection image suitable for Christmas can be projected. The control unit 3 can also control the projector 4 to project a specific image at a specific time of day based on the schedule information.

In addition, in the lighting system 1 according to the embodiment, the control unit 3 may control the lighting unit 2 and the projector 4 based on the surrounding weather information acquired by the surrounding information acquisition unit.

As described above, the control unit 3 can project a projection image related to a weather forecast by controlling the lighting unit 2 and the lighting unit 4 based on the surrounding weather information acquired by the surrounding information acquisition unit.

In addition, in the lighting system 1 according to the embodiment, the control unit 3 may control the luminaire unit 2 and the projector 4 based on the surrounding illuminance information acquired by the surrounding information acquisition unit.

As described above, the control unit 3 controls the lighting unit 2 and the projector 4 based on the information on the surrounding illuminance acquired by the surrounding information acquisition unit, thereby effectively improving the visibility of the projected image whether the surrounding illuminance is high or low. For example, when the surrounding illuminance is high, the projection image is projected brighter than when the surrounding illuminance is low, thereby improving the visibility of the projected image even when the surrounding illuminance is high.

The lighting system 1 according to the embodiment may be configured as a street light including a lamp unit 2, a pole 5 for installing the lamp unit 2, a mounting part 5a for mounting a projector 4 on the pole 5, and a control part 3 for controlling the lamp unit 2. The control part 3 separately controls the lamp unit illumination light emitted from the lamp unit 2 in a specific direction (direction toward the lamp unit illumination light control area 7) including the illumination direction of the projector 4 attached to the mounting part 5a, and in other area directions.

By using the lighting system 1 having the above configuration, it is possible to control the light emitted by the lighting unit in the lighting unit light control area 7, thereby making the projected image from the projector 4 stand out and providing a street light that can improve visibility.

The lighting system 1 according to the embodiment may be configured as a street light including a lamp unit 2, a projector 4, a pole 5 for mounting the lamp unit 2 and the projector 4, and a control unit 3 for controlling the lamp unit 2. The control unit 3 controls the lamp unit illumination light emitted from the lamp unit 2 according to the operating status of the projector 4 and the projection content.

By using the lighting system 1 having the above-described configuration, it is possible to provide a street light that can enhance the visibility by making the image projected by the projector 4 stand out.
Other Embodiments
The lighting system 1 shown in the above embodiment is an integrated unit of the lighting unit 2 and the projector 4, and can be installed in places such as roads, parking lots, squares, and gymnasiums.

On the other hand, as a second modification of the above embodiment, the lighting unit 2 and the projector 4 may be installed at separate locations, as shown in FIG. 6. Even in this case, the function of the control unit 3 and the role of the direction control unit 2d that adjusts the optical characteristics of the light emitted by the lighting unit and the light control film 2e are the same as in the case where the lighting unit 2 and the projector 4 are integrated as described above.

Another example of an application of the lighting system 1 in which the lighting unit 2 and the projector 4 are installed at a distance from each other, as in variant example 2, is a shopping mall. In this case, as shown in FIG. 6, the lighting unit 2 can be installed at the end of the passageway, and the projector 4 can be installed in the center of an arcade installed above the passageway.

In addition, in the lighting system 1 according to the above embodiment, the camera 10 is provided on the pole 5, but the present invention is not limited to this. For example, as shown in FIG. 6, the surrounding information acquisition unit such as the camera 10 may be provided in a location separate from the lighting unit 2 and the projector 4. Furthermore, the signal receiving unit 3c (not shown) may also be provided in a location separate from the lighting unit 2 and the projector 4. Even in this case, the roles of the surrounding information acquisition unit such as the camera 10 and the signal receiving unit 3c are the same as those in the above embodiment.

In the above embodiment, the lighting system 1 has been mainly described as a street lamp in which the lighting unit 2 is mounted on a pole 5, but the present invention is of course not limited to a street lamp. As the lighting unit 2, various lighting fixtures such as downlights and spotlights mounted on a ceiling surface can be used. In this case, the projector 4 may be installed on the ceiling surface or a wall surface at a location separated from the lighting unit 2, or the projector 4 may be attached to a pole fixed vertically to the ground.

In the above embodiment, the control unit 3 is provided in one place, but the present invention is not limited to this. For example, the luminaire control unit 3a may be provided in the luminaire unit 2, and the projector control unit 3b may be provided in the projector 4.

In addition, in the above embodiment, the control unit 3 is included in the lighting unit 2, but the present invention is not limited to this. For example, the control unit 3 may be attached to a pole 5 at a position away from the lighting unit 2, or may be attached to a wall or ceiling surface away from the lighting unit 2. In this case, the control unit 3 can transmit control signals to the lighting unit 2 and the projector 4 wirelessly or via a wire.

The above-mentioned embodiments are merely examples of the implementation of the present invention, and the numerical values, shapes, components, materials, etc. are merely examples of preferred ones, and the present invention is not limited to these embodiments. Furthermore, among the components in the above-mentioned embodiments, those components that are not described in the independent claims that show the highest concept are optional components. It is possible to make appropriate changes to the configuration without departing from the scope of the technical idea of the present invention.

Reference Signs List 1: Illumination system 2: Lighting unit 2e: Light control film 2f: Housing 3: Control unit 3a: Lighting unit control unit 3b: Projector control unit 3c: Signal receiving unit 4: Projector 5: Pole 5a: Mounting unit 10: Camera (peripheral information acquisition unit)
31 Evaluation result acquisition unit 32 Projection content determination unit

Claims (27)

A lighting system having a projector, a lighting unit, and a control unit that controls the lighting unit,
The illuminance of a lighting unit illumination area, which is an area outside the projection direction of the projector and is illuminated by the illumination light of the lighting unit, is defined as an environmental illuminance;
The illuminance of the area where the projected image from the projector is projected, where the illuminance when the projector projects an all-white pattern is the projector projection area illuminance,
The control unit calculates the magnitude of the environmental illuminance relative to the projector projection area illuminance by:
A lighting system characterized by controlling based on a recommended illuminance ratio classification that is predefined for each projection type of the projection content of a projector . The control unit controls the light emitted from the lighting unit depending on an operating state of the projector and a small amount of projection content.
2. The lighting system according to claim 1, wherein the specific illumination direction and the other illumination directions are separately controlled in accordance with at least one of the two illumination directions. The lighting system according to claim 1 , wherein the control unit controls the luminous intensity of the light emitted from the lighting unit in a specific irradiation direction so as to be lower when the projector is operating compared to when the projector is not operating. The lighting system according to claim 2 or 3 , wherein the specific irradiation direction includes at least a part of a projection direction of the projector. The lighting system according to claim 1 , wherein the control unit controls a luminous intensity of the light emitted from the lighting unit. The control unit is configured to:
6. The lighting system according to claim 1, wherein the illumination is controlled to be equal to or less than 1 . 7. The lighting system according to claim 1 , wherein the magnitude of the environmental illuminance relative to the projector projection area illuminance is 0.05 or less. 8. The lighting system according to claim 1, wherein, in the recommended illuminance ratio categories, a ratio of an upper limit value of a recommended range of illuminance ratios in the category with the largest illuminance ratio to an upper limit value of a recommended range of illuminance ratios in the category with the smallest illuminance ratio is equal to or greater than two. an evaluation result acquisition unit that acquires an evaluation result of the viewability of the projection content by an observer,
The lighting system according to any one of claims 1 to 8, characterized in that the control unit is capable of appropriately changing the ratio between the ambient illuminance and the projector projection area illuminance to a more preferable numerical range based on the evaluation result acquired by the evaluation result acquisition unit. 10. The lighting system according to claim 1, wherein the projection content of the projector is determined in advance . Further, a projection content determination unit that determines the projection content is provided,
11. The lighting system according to claim 1, wherein the control unit determines a ratio between the environmental illuminance and the projector projection area illuminance based on a projection content determination result determined by the projection content determination unit. The lighting system according to any one of claims 1 to 11, characterized in that the control unit controls the luminous intensity for each irradiation direction of the light emitted by the lighting unit by changing the orientation or position of a light source provided in the lighting unit or an optical element that controls the emission direction of light from the light source. The lighting system according to claim 1 , wherein the control unit controls a chromaticity of the light emitted by the lighting unit. The lighting unit includes a light control film capable of electrically adjusting light transmission characteristics,
The lighting system according to claim 1 , wherein the control unit controls the light control film to control optical characteristics of the light emitted by the lighting unit. 15. The lighting system according to claim 1, wherein the lighting unit has a housing and a light source unit connected to the housing, and an image projection unit of the projector is contained in the housing. The lighting system according to claim 1 , wherein the lighting unit and the projector are both installed at a height of 2.5 m or more from the ground. A surrounding information acquisition unit for acquiring surrounding information,
The lighting system according to claim 1 , wherein the control unit determines a control content of the luminaire unit based on the information received by the surrounding information acquisition unit. The control unit controls the projector,
The control unit determines a control content of the projector based on the information received by the peripheral information acquisition unit.
20. The lighting system according to claim 17, The lighting system according to claim 18, wherein the control unit includes a luminaire control unit that controls the luminaire unit and a projector control unit that controls the projector, the luminaire control unit and the projector control unit communicating with each other. 20. The lighting system according to claim 18, further comprising a signal receiving unit configured to receive a control signal for controlling at least one of the lighting unit and the projector from an external source. The lighting system according to claim 18 , wherein the peripheral information acquisition unit is a sensing device that automatically detects a surrounding situation. 22. The lighting system of claim 21, wherein the sensing device is a camera. The surrounding information includes at least one of the number of people, age, sex, facial expression, and emotion as attribute information of people present in the surrounding area,
23. The lighting system according to claim 18, wherein the control unit determines control contents of the projector based on the attribute information. 24. The lighting system according to claim 18, wherein the surrounding information acquisition unit acquires information on surrounding road traffic as the surrounding information. A memory for storing schedule information;
25. The lighting system according to claim 18, wherein the control unit controls the lighting unit and the control content of the projector based on the schedule information. The surrounding information acquisition unit acquires surrounding weather information as the surrounding information,
26. The lighting system according to claim 18, wherein the control unit controls the lighting unit and the projector based on the weather information. The surrounding information acquisition unit acquires surrounding illuminance information as the surrounding information,
27. The lighting system according to claim 18, wherein the control unit controls the lighting unit and the projector based on the illuminance information.

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