JP7296580B2 - lighting system - Google Patents

Description

The present invention relates to lighting systems.

Conventionally, various lighting systems have been proposed. Patent Literature 1 discloses a lighting system that can provide a lighting environment in which a user can comfortably perform a visual task while projecting an image using a light projection device and using an effect.

JP 2016-170972 A

The present invention provides a lighting system that can achieve both visibility of images and ensuring brightness in a space where the images are projected.

An illumination system according to an aspect of the present invention includes a projector that projects onto a projection surface an image in which a subject is represented by shadows in at least a partial area, and an illumination device that irradiates the projection surface with illumination light, The illuminance of the image on the projection plane is 0.3 to 55 times the illuminance of the illumination light.

The lighting system of the present invention can ensure both the visibility of images and the brightness in the space where the images are projected.

FIG. 1 is a diagram showing an overview of a lighting system according to an embodiment. FIG. 2 is a block diagram of the functional configuration of the lighting system according to the embodiment. FIG. 3 is a diagram for explaining an outline of an experiment regarding subjective evaluation. FIG. 4 is a graph showing the results of an experiment on subjective evaluation. FIG. 5 is a diagram showing a table summarizing the results of experiments on subjective evaluation. FIG. 6 is a flowchart of Operation Example 1 of the lighting system according to the embodiment. FIG. 7 is a flowchart of Operation Example 2 of the lighting system according to the embodiment.

Hereinafter, embodiments will be specifically described with reference to the drawings. It should be noted that the embodiments described below are all comprehensive or specific examples. Numerical values, shapes, materials, components, arrangement positions and connection forms of components, steps, order of steps, and the like shown in the following embodiments are examples and are not intended to limit the present invention. Further, among the constituent elements in the following embodiments, constituent elements not described in independent claims will be described as optional constituent elements.

Each figure is a schematic diagram and is not necessarily strictly illustrated. Moreover, in each figure, the same code|symbol is attached|subjected with respect to substantially the same structure, and the overlapping description may be abbreviate|omitted or simplified.

(Embodiment)
[Outline of lighting system]
First, the configuration of the lighting system according to the embodiment will be described. FIG. 1 is a diagram showing an overview of a lighting system according to an embodiment. FIG. 2 is a block diagram of the functional configuration of the lighting system according to the embodiment.

The lighting system 100 includes a projector 10 , two lighting devices 20 , a control device 30 and an illuminance sensor 40 . The lighting system 100 only needs to have at least one lighting device 20 .

The lighting system 100 is a system in which the projection of an image by the projector 10 and the irradiation of illumination light by the lighting device 20 can be performed in parallel in the space 50 in which the projector 10 and the lighting device 20 are installed. Space 50 is, for example, a closed space such as a room.

The image projected by the projector 10 is, for example, a monochrome image imitating the shadow of a tree (in other words, a monochrome image of sunlight filtering through foliage). Such images are used, for example, for spatial presentation.

In general, when projecting an image for presentation, it is necessary to make the space 50 relatively dark in order to ensure the appearance (visibility) of the image. That is, it is necessary to reduce the brightness of the light emitted by the illumination device 20 . According to the knowledge of the inventors, the illuminance on the image projection plane needs to be less than 50 lux, for example.

On the other hand, the inventors have found a predetermined condition regarding illuminance, which will be described later. In lighting system 100, when an image in which a subject is represented by shadows in at least a part of an area, such as the above-described monochrome image imitating tree shadows, is projected, as long as this predetermined condition is satisfied, the image is projected. The visibility of the image is ensured even if the projection surface of is brightened by the illumination light emitted from the illumination device 20. - 特許庁For example, the illuminance on the image projection plane is allowed to be 50 lux or more.

In other words, the lighting system 100 can achieve both visibility of the image and ensuring brightness in the space where the image is projected. In other words, the image presentation can be performed while the space 50 is in a bright state. According to the lighting system 100, it is possible to expand the range of use of images for presentation to a space 50 such as an office or a hospital that requires brightness. In addition, the lighting system 100 can also easily achieve a light presentation with improved color rendering by auxiliary irradiating illumination light with high color rendering on the image projection plane.

[Configuration of lighting system]
Each device included in such a lighting system 100 will be described below. First, the projector 10 will be explained.

Projector 10 is installed on the ceiling, wall, or the like of space 50 . The projector 10 includes a light source and image elements such as a transmissive liquid crystal panel, a micromirror array, or a reflective liquid crystal panel that modulates the light emitted by the light source. screen, etc.). The projector 10 projects an image for presentation whose contrast ratio is lower than that of a general image. An image for such a presentation is, for example, a monochrome image (in other words, a grayscale image) imitating the shade of a tree, but it may be an image represented by a single color shade other than black, or may be a color image. It may be a video.

The contrast ratio of the image for presentation is, for example, 100:1 or less. Note that the contrast ratio is a physical quantity indicating how many times the brightness of the brightest part (white) is when the darkest part (black) of the image is 1. A contrast ratio of 100:1 or less means that the brightest part of the image is 100 or less when the darkest part of the image is set to 1. That is, a contrast ratio of 100:1 or less means a contrast ratio of 50:1 or the like.

The projector 10 is controlled based on control signals transmitted from the control device 30, but can also be controlled by the user operating a dedicated remote controller or the like. Specifically, the image to be projected by the projector 10, the contrast of the image, the brightness of the image, the shape of the image (trapezoidal distortion), and the like can be changed.

Next, the illumination device 20 will be described. The illumination device 20 is installed in a space 50 where the projector is installed, and illuminates a projection surface (floor surface in FIG. 1) onto which the projector 10 projects an image. The illumination device 20 irradiates illumination light so as to overlap the region on the projection surface where the image is projected. The lighting device 20 is, for example, a downlight embedded in the ceiling or wall of the space 50, but the specific aspect of the lighting device 20 is not particularly limited. The lighting device 20 may be a ceiling light installed on the ceiling of the space 50 or a spotlight installed on the ceiling or wall of the space 50 .

The general color rendering index (Ra) of the illumination device 20 is, for example, 80 or more. That is, the illumination device 20 has relatively high color rendering properties.

The light emission state of the lighting device 20 is controlled based on a control signal transmitted from the control device 30, but can also be controlled by the user operating a dedicated remote controller or the like. The control of the light emitting state here includes, for example, switching control of lighting and extinguishing, dimming control (in other words, control of dimming rate (0% to 100%)), toning control, and light distribution control. is included.

The illumination device 20 includes, for example, a light-emitting module in which a plurality of LED elements are mounted on a substrate. The plurality of LED elements include a first LED element that emits white light with a relatively low color temperature (e.g., light bulb color) and a second LED element that emits white light with a relatively high color temperature (e.g., daylight white). elements. The emission brightness of the first LED element and the second LED element are independently controlled. Thereby, the dimming function and the toning function of the lighting device 20 are realized.

The specific mode of the light-emitting module is not particularly limited, and the light-emitting module is a light-emitting module in which a plurality of LED elements are mounted on a substrate, and each of the plurality of LED elements includes a red LED chip and a blue LED. A light-emitting module may include a chip and a green LED chip, and the brightness of each LED chip may be independently controlled. Further, the light-emitting module is not limited to a light-emitting module using an LED element, and may be a light-emitting module using a semiconductor light-emitting element such as a semiconductor laser, or a solid-state light-emitting element such as an organic EL (Electro Luminescence) or an inorganic EL. .

Note that, unlike the projector 10, the illumination device 20 does not have a function of projecting an image. Specifically, the illumination device 20 does not include an image element such as a transmissive liquid crystal panel, a micromirror array, or a reflective liquid crystal panel that the projector 10 has.

Next, the control device 30 will be explained. The control device 30 controls the projector 10 and the lighting device 20 . The control device 30 is a separate device from the projector 10 and the lighting device 20, but may be integrated with one of the projector 10 and the lighting device 20, and may be incorporated in the one device. The control device 30 includes a communication section 31 , a control section 32 , a storage section 33 and an operation reception section 34 .

The communication unit 31 is a communication circuit for the control device 30 to communicate with the projector 10, lighting device 20, and illuminance sensor 40 via the local communication network. The communication performed by the communication unit 31 may be wired communication or wireless communication. A communication standard for communication performed by the communication unit 31 is not particularly limited.

The control unit 32 controls the projector 10 and the lighting device 20 by causing the communication unit 31 to transmit control signals. The control unit 32 is implemented by, for example, a microcomputer, but may be implemented by a processor.

The storage unit 33 is a storage device in which programs executed by the control unit 32 are stored. The storage unit 33 is specifically implemented by a semiconductor memory or the like.

The operation accepting unit 34 is a user interface device that accepts user's operations. The operation reception unit 34 is implemented by a touch panel, hardware buttons, or the like. Note that it is not essential for the control device 30 to include the operation reception unit 34, and a mobile terminal having a dedicated application program installed and capable of communicating with the communication unit 31 may be used as the operation reception unit 34. good. A mobile terminal is specifically a smart phone or a tablet terminal.

Next, the illuminance sensor 40 will be described. The illuminance sensor 40 senses the illuminance of the projection surface (the floor surface in the example of FIG. 1) on which the image is projected by the projector 10 . The illuminance sensor 40 is, for example, integrated with the lighting device 20 and built into the lighting device 20 , but may be integrated with the projector 10 and built into the projector 10 . Further, the illuminance sensor 40 may be separate from either the projector 10 or the lighting device 20 and may be installed at a position different from either the projector 10 or the lighting device 20. For example, the illuminance sensor 40 may be installed on the projection plane. The illuminance sensor 40 may be installed on the floor material or wall material.

[Knowledge obtained by the inventors]
The inventors conducted an experiment on subjective evaluation of environmental illuminance and image visibility when an image of sunlight filtering through foliage is projected onto a projection surface. FIG. 3 is a diagram for explaining an outline of an experiment regarding such subjective evaluation. FIG. 3(a) shows the environment in which the experiment was conducted, and FIG. 3(b) shows the image used for the evaluation.

As shown in (a) of FIG. 3, in the subjective evaluation experiment, an image ((b) of FIG. 3) was projected onto a projection surface (wall surface) from a projector 10 installed on the ceiling, and 15 subjects Each of them was asked to subjectively evaluate whether the visibility of the image was acceptable. The projection plane is irradiated not only with the image but also with light from the lighting device 20 installed on the desk, and by controlling the lighting device 20, the illuminance (that is, the environmental illuminance) on the projection plane is changed to improve the visibility of the image. Subjects were asked to subjectively evaluate whether or not it was acceptable.

Specifically, a subjective evaluation of whether or not the visibility of the image is acceptable when the brightness is gradually increased from a state in which the lighting device 20 is turned off (that is, the environmental illuminance is zero), and A subjective evaluation of whether or not the visibility of the image is acceptable when the brightness is gradually decreased from the brightness state of 0.3 times was performed for each subject three times.

FIG. 4 is a diagram showing a graph of experimental results regarding such subjective evaluation. In FIG. 4 , the vertical axis indicates what percentage of the evaluators evaluated the visibility of the image as acceptable, and the horizontal axis indicates the illuminance of the projection surface caused by the light emitted by the lighting device 20 (that is, the environmental illuminance). is shown. The illuminance of the image on the projection plane (that is, the illuminance of the image on the projection plane when the illumination device 20 is off) is 183 lux.

As shown in FIG. 4, 75% of the subjects can accept the visibility of the image when the ambient illumination is 202 lux, and 50% of the subjects accept the visibility of the image when the ambient illumination is 366 lux. be able to. 25% of subjects can tolerate the visibility of the image when the ambient illumination is 550 lux.

FIG. 5 is a diagram showing a table summarizing the results of experiments on subjective evaluation. As shown in FIG. 5, if the illuminance of the image on the projection plane is 0.3 (image brightness 183 lux/environment illuminance 550 lux) times or more than the illuminance of the illumination light, 25% or more of the subjects of visibility can be allowed. It is more preferable that the illuminance of the image on the projection plane is 0.5 (image brightness 183 lux / environmental illuminance 366 lux) times or more the illuminance of the illumination light, and 50% or more of the subjects allow the visibility of the image. be able to.

Furthermore, if the illuminance of the image on the projection plane is 0.9 times the illuminance of the illumination light (image brightness 183 lux / ambient illuminance 202 lux), 75% or more of the subjects accept the visibility of the image. be able to. In other words, the illuminance is the amount of luminous flux per unit area.

Note that when the illuminance of the image on the projection plane is sufficiently higher than the illuminance of the illumination light, the visibility of the image is good. Considering that the maximum illuminance of an image that can be projected by the existing projector 10 is about 10000 lux, the illuminance of the image on the projection plane is 55 times or less (image brightness 10000 lux/environmental illuminance 202 lux) times the illuminance of the illumination light. becomes. If the illuminance of the image on the projection plane is less than 1 times the illuminance of the illumination light, the illuminance of the image is lower than the illuminance of the illumination light. Such a configuration is generally not adopted.

The fact that such a result was obtained indicates that users can perform cognitive interpolation based on their original experiences in everyday natural phenomena, so the degree of tolerance has increased compared to conventional video presentations. (In other words, it was possible to allow the environmental illuminance that is not allowed in general video production).

In addition, although the content of the projection surface is the sunshine filtered through the trees, the above effect can be similarly obtained with shadow expression based on arbitrary natural phenomena such as the water surface and ripples. Content can be freely selected.

In addition, control such as changing the content according to time, changing the playback speed, changing the color tone, changing the brightness, etc. may be performed. These may be performed by a user's operation or automatically. At this time, the design and comfort of the space are enhanced, which is preferable.

Based on the inventors' experiments as described above, in the lighting system 100, the illuminance of the image on the projection plane is 0.3 to 55 times the illuminance of the illumination light (hereinafter, the condition regarding this illuminance is a predetermined condition When the lighting system 100 is installed (constructed), the illuminance of the video and the illumination light are set so that Thereby, the lighting system 100 can illuminate the space 50 while ensuring the visibility of the image in the space 50 .

Further, in the illumination system 100, even if the illuminance of the illumination light on the projection plane is 50 lux or more, which is generally regarded as making it difficult to see the image, the illuminance of the image is 0.3 times or more than the illuminance of the illumination light. By controlling the projector 10 and the lighting device 20 so as to double or less, the visibility of the image can be ensured.

[Operation example 1]
For example, the lighting system 100 selectively operates in a normal mode in which the user can freely change the brightness of the image projected by the projector 10 and the brightness of the illumination light emitted by the lighting device 20 without restriction, and in the performance mode. run to In the performance mode operation, the projector 10 and the lighting device 20 are controlled so that the illuminance of the image on the projection plane is 0.3 to 55 times the illuminance of the illumination light. An operation for the user to perform such settings in advance and store (register) them as setting information will be described below. FIG. 6 is a flowchart of Operation Example 1 of the lighting system 100 .

First, the operation reception unit 34 of the control device 30 receives an operation from the user for projecting the illumination light onto the projection plane by the illumination device 20 (S11). Based on the operation received by the operation receiving unit 34, the control unit 32 causes the lighting device 20 (more specifically, each of the two lighting devices) to emit illumination light (S12). Specifically, the control unit 32 causes the communication unit 31 to transmit a control signal to the lighting device 20 to cause the lighting device 20 to emit illumination light. As a result, the projection plane is illuminated with illumination light having the user's desired illuminance.

The illuminance sensor 40 senses the illuminance of the illumination light illuminating the projection plane (S13), and as a result of the sensing, communicates first illuminance information indicating the illuminance of the illumination light illuminating the projection plane to the control device 30. 31. The control unit 32 stores the first illuminance information received by the communication unit 31 in the storage unit 33 (S14), and determines the illuminance on the projection plane of the image projected by the projector 10 based on the received first illuminance information. A permissible range is calculated (S15). As described above, the permissible range of the illuminance of the video is 0.3 to 55 times the illuminance indicated by the first illuminance information.

In this embodiment, the lighting system 100 always maintains the illuminance of the image at 0.3 times or more of the illuminance indicated by the first illuminance information, regardless of changes in lighting fixtures and the layout of the space, and changes in the environmental illuminance of the space due to changes in time and weather. It is preferable because it is kept at 55 times or less.

Next, the operation accepting unit 34 accepts an operation from the user for projecting an image onto the projection surface by the projector 10 (S16). The control unit 32 causes the projector 10 to project an image based on the operation accepted by the operation accepting unit 34 (S17). Specifically, the control unit 32 causes the communication unit 31 to transmit a control signal to the projector 10 to cause the projector 10 to project an image. As a result, an image with the user's desired illuminance is projected onto the projection plane.

The illuminance sensor 40 senses the illuminance of the projection surface (that is, the sum of the illuminance of the image and the illuminance of the illumination light) (S18), and outputs second illuminance information indicating the illuminance of the projection surface as a result of sensing to the control device. 30 to the communication unit 31. The control unit 32 stores the second illuminance information received by the communication unit 31 in the storage unit 33 (S19).

After that, when the user's setting completion operation is accepted by the operation accepting unit 34 (S20), the control unit 32 stores the illuminance indicated by the second illuminance information stored in the storage unit 33 in step S19 in the storage unit 33 in step S14. The illuminance of the image on the projection plane is calculated by subtracting the illuminance indicated by the stored first illuminance information (S21). Then, the control unit 32 determines whether or not the illuminance of the image on the projection plane is within the allowable range calculated in step S15 (S22).

When the controller 32 determines that the illuminance of the image on the projection plane is within the allowable range calculated in step S15 (Yes in S22), the controller 32 stores the setting information indicating the current settings of the projector 10 and the lighting device 20 in the storage unit 33. (S23). That is, the storage unit 33 stores setting information of the projector 10 and the illumination device 20 when the illuminance of the image on the projection plane is 0.3 to 55 times the illuminance of the illumination light. After that, when the operation accepting unit 34 accepts a user's operation instructing the presentation mode, the control unit 32 controls the projector 10 and the lighting device 20 based on the setting information stored in the storage unit 33 .

On the other hand, when the control unit 32 determines that the illuminance of the image on the projection plane is outside the allowable range calculated in step S15 (No in S22 ), the setting information is not stored in the storage unit 33. In this case, the user is notified that the settings are outside the allowable range, and the user redoes the settings.

According to Operation Example 1 as described above, the lighting system 100 selectively stores only the setting information such that the illuminance of the image on the projection plane is 0.3 to 55 times the illuminance of the illumination light. can be memorized.

In operation example 1, it is determined whether or not the illuminance of the image is within the allowable range after the illuminance of the illumination light is determined. It may be determined whether or not

In operation example 1, the illuminance of the projection plane is measured by the illuminance sensor 40, but it is not essential that the illuminance sensor 40 measures the illuminance of the projection plane. For example, the user may manually measure the illuminance of the projection plane with an illuminance meter when only the lighting device 20 among the projector 10 and the lighting device 20 emits light. In this case, the user can store the first illuminance information in the storage unit 33 by performing an input operation of the manually measured illuminance on the operation reception unit 34 . The control unit 32 calculates the allowable range of illuminance on the projection plane of the image projected by the projector 10 based on the stored first illuminance information. As described above, the permissible range of the illuminance of the video is 0.3 to 55 times the illuminance indicated by the first illuminance information.

In this embodiment, users who are unfamiliar with video equipment such as projectors, such as construction workers who specialize in installing lighting devices, can easily perform the initial settings of the system without separately setting the output conditions of the projector 10. is preferable because

[Operation example 2]
The setting of the projector 10 is changed during the operation of the presentation mode (that is, when the predetermined condition that the illuminance of the image on the projection surface is 0.3 times or more and 55 times or less than the illuminance of the illumination light is satisfied). Sometimes. The operation of the lighting system 100 in such a case will be described below. FIG. 7 is a flowchart of Operation Example 2 of the lighting system 100 .

The lighting system 100 operates in the production mode (S31). At this time, the predetermined condition that the illuminance of the image on the projection plane is 0.3 to 55 times the illuminance of the illumination light is satisfied.

Next, the operation accepting unit 34 accepts an operation from the user for changing the illuminance of the image projected by the projector 10 (S32). The control unit 32 determines whether or not a predetermined condition is satisfied when the illuminance of the image projected by the projector 10 is changed based on this operation (S33). For example, as described in the above operation example 1, if the illuminance of the image during operation in the production mode and the illuminance of the illumination light are stored in the storage unit 33 based on the illuminance information transmitted by the illuminance sensor 40 , the control unit 32 can estimate the illuminance of the image after change and determine whether or not the estimated illuminance of the image after change satisfies a predetermined condition.

When the control unit 32 determines that the predetermined condition is satisfied when the illuminance of the image projected by the projector 10 is changed based on the above operation (Yes in S33), the control unit 32 changes the illuminance of the image projected by the projector 10 ( S34). In other words, the control unit 32 controls the projector 10 according to the user's instructions. At this time, the illumination device 20 is not particularly controlled.

On the other hand, when the control unit 32 determines that the predetermined condition is not satisfied when the illuminance of the image projected by the projector 10 is changed based on the above operation (No in S33), the control unit 32 causes the projector 10 to The illuminance of the image to be projected is changed (S35), and the illuminance of the illumination light emitted by the illumination device 20 is changed so that a predetermined condition is satisfied (S36). In other words, the control unit 32 controls the projector 10 according to the user's instructions, and also controls the lighting device 20 so that a predetermined condition is satisfied.

As described above, the lighting system 100 controls the projector 10 according to the user's instruction, and the illumination device 20 illuminates when the predetermined condition is not satisfied by controlling the projector 10 according to the user's instruction. A predetermined condition can be satisfied by changing the illuminance of the illumination light. In other words, the lighting system 100 ensures the visibility of the image by interlocking and controlling the projector 10 and the lighting device 20 .

In addition, in the operation example 2, the case where the change of the illuminance of the image projected by the projector 10 is instructed has been described, but the same applies to the case where the illuminance of the illumination light emitted by the lighting device 20 is changed. That is, when the predetermined condition is not satisfied by controlling one of the projector 10 and the lighting device 20 in accordance with the user's instruction, the control unit 32 controls the one of the projector 10 and the lighting apparatus 20 in accordance with the user's instruction, and , the other of the projector 10 and the lighting device 20 may be controlled so as to satisfy a predetermined condition.

Further, it is not essential that the interlocking control as in Operation Example 2 is performed, and the lighting system 100 may invalidate the user's operation that does not satisfy the predetermined condition during the operation of the presentation mode.

[Effects, etc.]
As described above, the illumination system 100 includes the projector 10 that projects an image in which the subject is represented by shadows in at least a part of the projection surface, and the illumination device 20 that irradiates the projection surface with illumination light, On the projection plane, the illuminance of the image is 0.3 to 55 times the illuminance of the illumination light.

Such an illumination system 100 can ensure the visibility of an image even if the projection surface is brightened with illumination light. Therefore, lighting system 100 can ensure both the visibility of the image and the brightness in the space where the image is projected.

Also, for example, the illuminance of the illumination light on the projection plane is 50 lux or more.

Such a lighting system 100 can ensure the visibility of a visual image even when the illuminance of the illumination light on the projection plane is 50 lux or more, which generally makes it difficult to see the image.

Also, for example, the lighting system 100 further includes a control device 30 that controls the projector 10 and the lighting device 20 . The control device 30 stores the setting information of the projector 10 and the lighting device 20 when the illuminance of the image on the projection plane is 0.3 times or more and 55 times or less than the illuminance of the illumination light. and a control unit 32 that controls the projector 10 and the lighting device 20 based on the control unit 32 .

Such a lighting system 100 can control the projector 10 and the lighting device 20 based on the setting information.

Further, for example, the control unit 32 controls one of the projector 10 and the lighting device 20 according to the user's instruction so that the illuminance of the image on the projection plane is 0.3 times or more and 55 times or less than the illuminance of the illumination light. When a certain condition is no longer satisfied, one device is controlled according to a user's instruction, and the other of the projector 10 and lighting device 20 is controlled so that the condition is satisfied.

The lighting system 100 as described above can ensure the visibility of the image even when the user gives an instruction to change the setting by interlocking control of the projector 10 and the lighting device 20 .

Also, for example, the contrast ratio of the video is 100:1 or less.

Such a lighting system 100 can project an image with a contrast ratio of 100:1 or less.

Further, for example, the general color rendering index of the illumination device 20 is 80 or higher.

Such an illumination system 100 can emit illumination light with high color rendering properties. Auxiliary illumination of such illumination light with high color rendering properties on the image projection plane realizes a light presentation with improved color rendering properties.

Also, for example, the video is a monochrome video.

Such an illumination system 100 can project a monochrome image.

(Other embodiments)
Although the embodiments have been described above, the present invention is not limited to the above embodiments.

For example, in the above embodiments, it was explained that the lighting system was used for staging, but it may be used for purposes other than staging.

Also, in the above embodiments, the lighting system is implemented by a plurality of devices, but may be implemented as a single device. When the lighting system is implemented by multiple devices, the components included in the lighting system described in the above embodiments may be distributed to the multiple devices in any way.

Further, in the above-described embodiments, the processing executed by a specific processing unit may be executed by another processing unit. In addition, the order of multiple processes may be changed, and multiple processes may be executed in parallel.

Also, in the above embodiments, each component may be realized by executing a software program suitable for each component. Each component may be realized by reading and executing a software program recorded in a recording medium such as a hard disk or a semiconductor memory by a program execution unit such as a CPU or processor.

Also, each component may be realized by hardware. Each component may be a circuit (or integrated circuit). These circuits may form one circuit as a whole, or may be separate circuits. These circuits may be general-purpose circuits or dedicated circuits.

Also, general or specific aspects of the present invention may be implemented in a system, apparatus, method, integrated circuit, computer program or recording medium such as a computer-readable CD-ROM. Also, any combination of systems, devices, methods, integrated circuits, computer programs and recording media may be implemented.

For example, the present invention may be implemented as the control device of the above embodiment, or may be implemented as a lighting device control method executed by a computer such as a control device. The present invention may be implemented as a program for causing a computer to execute a method for controlling a lighting device, or as a computer-readable non-temporary recording medium in which such a program is recorded.

In addition, forms obtained by applying various modifications to each embodiment that a person skilled in the art can think of, or realized by arbitrarily combining the constituent elements and functions of each embodiment without departing from the spirit of the present invention. Also included in the present invention.

10 projectors
20 lighting device
30 control device 32 control unit 33 storage unit 40 illuminance sensor 50 space 100 lighting system

Claims (6)

a projector that projects onto a projection surface an image in which a subject is represented by shadows in at least a partial area;
a lighting device that irradiates illumination light onto the projection plane ;
A control device that controls the projector and the lighting device ,
On the projection plane, the illuminance of the image is 0.3 times or more and 55 times or less than the illuminance of the illumination light,
The control device comprises a control unit,
The controller controls one of the projector and the lighting device according to a user's instruction so that the illuminance of the image on the projection plane is 0.3 times or more and 55 times or less than the illuminance of the illumination light. is no longer satisfied, the one device is controlled according to the user's instruction, and the other of the projector and the lighting device is controlled so that the condition is satisfied.
lighting system. 2. The lighting system according to claim 1, wherein the illuminance of the illumination light on the projection plane is 50 lux or more. The control device further stores setting information of the projector and the lighting device when the illuminance of the image on the projection plane is 0.3 to 55 times the illuminance of the illumination light. with
The control unit controls the projector and the lighting device based on the setting information.
3. A lighting system according to claim 1 or 2. 4. The lighting system according to any one of claims 1 to 3 , wherein the image has a contrast ratio of 100:1 or less. The lighting system according to any one of claims 1 to 4 , wherein the lighting device has a general color rendering index of 80 or more. The lighting system according to any one of claims 1 to 5 , wherein the image is a monochrome image.

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