JP7114174B2 - lighting equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a lighting device used in an outdoor stadium or the like.

Conventionally, lighting devices used in outdoor stadiums (e.g., baseball stadiums, soccer stadiums, track and field stadiums, tennis courts, racetracks, auto race tracks) etc. It is equipped with a light projecting part for projecting light to. The light projecting section has a plurality of light projectors as disclosed in Patent Documents 1 and 2 below, for example. Each light projector corresponds to one of the plurality of areas of the surface to be illuminated, and its arrangement and orientation are set so as to mainly project light to the corresponding area.

With such a conventional lighting device, a game is started before sunset when the sky is still bright, and the game is continued even after the natural light has completely disappeared after sunset, such as a night game of professional baseball. In this case, even when the sky is still bright before sunset and natural light is illuminating the surface to be illuminated, the light projection unit projects light at a 100% light intensity assuming that it will be after sunset.

Japanese Patent No. 6285731 Japanese Patent No. 6302686

However, in the conventional lighting device, even when the light projecting unit is before sunset and the sky is still bright and natural light is illuminating the surface to be illuminated, light is projected at 100% assuming that it will be after sunset. Therefore, before sunset, the brightness of the surface to be illuminated is higher than the specified brightness, which wastes power and drives the projector to emit more light than necessary. The life of the projector will also be shortened.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lighting apparatus capable of saving power and extending the life of a projector.

The following aspects are presented as means for solving the above problems. A lighting device according to a first aspect comprises a light projecting unit that projects light onto an illuminated surface that can directly or indirectly receive natural light, a measuring unit that measures the brightness of the illuminated surface, and and a control unit for controlling the amount of light projected by the light projecting unit so that the brightness of the surface to be illuminated approaches a target brightness based on the determined brightness.

The brightness may be, for example, illuminance or luminance. The brightness of the illuminated surface may be, for example, the brightness of a part of the illuminated surface, the average brightness of a plurality of locations on the illuminated surface, or the illuminated surface. It may be the average brightness over the whole or a wide area of . The control of the amount of projected light may be stepwise control of the amount of projected light, or continuous control of the amount of projected light.

According to the first aspect, the measuring unit measures the brightness of the illuminated surface, and the control unit determines the brightness of the illuminated surface based on the brightness measured by the measuring unit. Since the amount of light projected by the light projecting unit is controlled so as to approach the target brightness, the brightness of the surface to be illuminated does not become excessively bright even before sunset, thereby saving power and reducing the number of projectors. Longer life can be achieved.

A lighting device according to a second aspect is the illumination device according to the first aspect, wherein the light projecting unit is a plurality of light projectors, each of the light projectors corresponding to one of a plurality of areas of the illuminated surface. and a plurality of light projectors that mainly project light onto the corresponding areas, the measurement unit measures the brightness of each of the plurality of areas of the illuminated surface, and the control unit measures the brightness of each of the areas. For each of the plurality of areas, based on the brightness of the area measured by the measuring unit, among the projectors corresponding to the area, the brightness of the area approaches the target brightness of the area. to control the amount of light projected by at least one light projector.

Assuming that only natural light is used and no light is projected by the light projecting unit, as the sun sets in the evening or the like, a shadow is partially formed on the surface to be illuminated, and the shadow area gradually expands. Sometimes. For example, as the sun sets in the evening, the shadows of the stands of the stadium may partially appear on the field surface of the stadium, and the shadow area may gradually expand.

According to the second aspect, the measurement unit measures the brightness of each of the plurality of regions of the surface to be illuminated, and the control unit measures the brightness of each of the plurality of regions for each of the plurality of regions. Based on the brightness of the area measured by the measuring unit, the light emission amount of at least one of the light projectors corresponding to the area is adjusted so that the brightness of the area approaches the target brightness of the area. Since the control is performed, the amount of light projected from the light projecting unit for the shaded portion due to natural light increases, while the light projected from the light projecting unit for the sunny portion due to natural light decreases. Therefore, according to the second aspect, the light-dark contrast on the surface to be illuminated, which is produced only by natural light in the evening, is reduced by the amount of light projected for each region, and the shadow caused by the natural light is reduced. It is possible to reduce the brightness difference that occurs, and it is possible to perform higher quality illumination.

A lighting device according to a third aspect, in the second aspect, is characterized by: and a selection unit for selecting one set used in the unit.

According to this third aspect, the brightness distribution on the surface to be illuminated is set to the brightness distribution indicated by one set selected by the selector from among the plurality of sets of the target brightnesses of the plurality of regions. be able to.

Therefore, according to the third aspect, for example, when one of a plurality of types of games (for example, baseball and soccer) is selectively played in the stadium, a brightness distribution suitable for each game is displayed. By preparing a plurality of sets of the target brightness, a brightness distribution suitable for each competition can be obtained. Further, according to the third aspect, for example, a brightness distribution suitable for performing track and field events at the same time in a track and field stadium, and a track portion that attracts attention to track events only when only track events are performed. a plurality of sets of said target brightnesses each showing a brightness distribution that brightens only the field game, and a brightness distribution that brightens only the field part so as to draw attention only to the field game when only the field game is played. By preparing them, it is possible to make the brightness distribution suitable for each. Further, according to the third aspect, for example, in the case of a stadium having a plurality of tennis courts, a brightness distribution suitable for simultaneous matches on a plurality of tennis courts, and a single tennis court for a final match, etc. By preparing a plurality of sets of the target brightnesses each showing a brightness distribution that brightens only the tennis court so as to draw attention to the court, a brightness distribution suitable for each can be obtained. . Further, according to the third aspect, for example, in a soccer field, a plurality of sets of the target brightness are prepared, each showing a brightness distribution suitable during a game and a brightness distribution suitable for a halftime show. By placing them, a brightness distribution suitable for each can be obtained.

A lighting device according to a fourth aspect is the illumination device according to the second aspect, further comprising setting means for variably setting the target brightness of the plurality of areas according to a command.

According to the fourth aspect, since the setting means is provided, it is possible to variably set the brightness distribution of the illuminated surface according to the instruction. Therefore, according to the fourth aspect, the brightness distribution of the surface to be illuminated can be appropriately changed according to the situation, etc., and various illuminations can be performed.

A lighting device according to a fifth aspect is the lighting device according to any one of the second to fourth aspects, wherein the measurement unit includes imaging means for imaging the surface to be illuminated, and the plurality of measurements based on the images taken by the imaging means. and means for obtaining a value indicative of the brightness of the area.

According to the fifth aspect, the values indicating the brightness of the plurality of regions of the illuminated surface are obtained based on the image captured by the imaging means, so the brightness of the plurality of regions can be easily obtained. .

A lighting device according to a sixth aspect is, in any one of the first to fifth aspects, wherein the measurement unit uses luminance as the brightness.

Although the sixth mode uses luminance as the brightness, illuminance may be used as the brightness.

According to a seventh aspect, in any one of the first to sixth aspects, the lighting device is a stadium lighting device, and the surface to be illuminated includes a field surface of a stadium.

The seventh aspect exemplifies a stadium lighting device as the lighting device. The same applies to lighting devices provided in facilities (for example, indoor facilities such as gymnasiums that have windows and use external light such as stadiums).

According to the present invention, it is possible to provide an illuminating device capable of maintaining proper brightness of the surface to be illuminated, as well as saving power and extending the life of the projector.

1 is a schematic block diagram showing a lighting device according to a first embodiment of the invention; FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic perspective view which shows typically the example of arrangement|positioning in a stadium of each part of the illuminating device by the 1st Embodiment of this invention. 4 is a schematic flow chart showing an example of the operation of the lighting device according to the first embodiment of the present invention; FIG. 7 is a schematic diagram schematically showing an arrangement example in a stadium of each part of the lighting device according to the second embodiment of the present invention; FIG. 11 is a schematic perspective view schematically showing an arrangement example in a stadium of each part of the lighting device according to the third embodiment of the present invention, together with a situation in which shadows are generated in the stadium. FIG. 11 is a schematic cross-sectional view schematically showing how shadows are generated in a stadium provided with the illumination device according to the third embodiment of the present invention; FIG. 11 is a schematic plan view schematically showing individual regions on the surface to be illuminated, which are used by the illumination device according to the third embodiment of the present invention; FIG. 8 is a schematic perspective view schematically showing how light is projected mainly onto one of the plurality of regions shown in FIG. 7 from some light projectors of the illumination device according to the third embodiment of the present invention; It is a diagram. It is a schematic flowchart which shows an example of operation|movement of the illuminating device by the 3rd Embodiment of this invention. FIG. 5 is a schematic block diagram showing a lighting device according to a fourth embodiment of the invention;

A lighting device according to the present invention will be described below with reference to the drawings.

[First embodiment]

FIG. 1 is a schematic block diagram showing a lighting device 1 according to a first embodiment of the invention. FIG. 2 is a schematic perspective view schematically showing an arrangement example in a stadium of each part of the lighting device 1 according to the present embodiment.

A lighting device 1 according to the present embodiment is installed in an outdoor baseball field 2 as an outdoor stadium, and is configured as a lighting device for an outdoor baseball field. In the example shown in FIG. 2, the outdoor baseball field 2 has a field surface (ground surface in this example) 2a forming part of the illuminated surface, stands 2b surrounding it, and a back screen 2c. In FIG. 2, 2d indicates the foul line on the right side, and 2e indicates the foul line on the left side. Note that the stand 2b also forms part of the surface to be irradiated.

The illumination device 1 according to the present embodiment includes N (a plurality of, for example, several tens to several hundred) light projectors 11-1, 11-2, , 11-N, a measuring unit 12 for measuring the brightness of the illuminated surface, and the brightness measured by the measuring unit 12 so that the brightness of the illuminated surface approaches the target brightness. and a control unit 13 having a control section 31 for controlling the light projection amount of the light projection section. . . , 11-N are denoted by 11 when they are not distinguished from each other.

In this embodiment, although not shown in detail in the drawings, N/4 of N projectors 11 are arranged in a matrix on four pedestals 52 supported by posts 51 erected on four sides. is provided in Each light projector 11 corresponds to one of the plurality of areas of the surface to be illuminated, and its orientation is set so as to mainly project light to the corresponding area.

Each light projector 11 has an LED 21 as a light source and a drive circuit (for example, a drive circuit that realizes PWM control) that drives the LED 21 so that the LED 21 emits the amount of light projected by the control signal from the control unit 31. there is As the structure of each light projector 11, for example, a structure similar to that of the light projectors disclosed in Patent Documents 1 and 2 can be adopted. The configuration, structure, arrangement, installation structure, and the like of the light projector 11 are not limited to the examples described above. Moreover, the light source of the light projector 11 is not limited to the LED.

In the present embodiment, the measurement unit 12 acquires a value indicating the brightness of the illuminated surface based on a digital camera 41 as imaging means for capturing an image of the illuminated surface, and an image captured by the camera 41. and an image processing unit 42 . In this embodiment, the camera 41 captures an image including a region R0 near the center of the field surface 2a as a partial region of the surface to be illuminated, and the image processing unit 42 averages the luminance values of the region R0. A value is obtained as a measure of the brightness of the illuminated surface. However, the present invention is not limited to this. A luminance meter may be used as the measurement unit 12 instead of the camera 41 and the image processing unit 42 .

In the present embodiment, the control unit 13 controls, in addition to the control unit 31, the target value of the brightness of the surface to be illuminated (specifically, the average brightness value of the target region R0 in the present embodiment). value).

In the present embodiment, the control unit 31 controls each projector so that the average value of the luminance values of the region R0 approaches the target value stored in the storage unit 32 based on the measured values obtained by the measurement unit 12. A control signal is given to the drive circuit 22 of 11. The control unit 31 can be configured by, for example, a microcomputer.

FIG. 3 is a schematic flow chart showing an example of the operation of the illumination device 1 according to this embodiment.

When the illumination device 1 according to the present embodiment starts to operate, first, the measurement unit 12 measures the brightness of the surface to be illuminated and obtains a measurement value indicating the brightness (step S1). Next, the control unit 31 compares the measured value obtained in step S1 with the target value stored in the storage unit 32 (step S2), and obtains a value indicating the brightness of the surface to be illuminated ( In the embodiment, the amount of light projected from all the light projectors 11 is uniformly controlled so that the average value of the luminance values of the region R0 conforms to the target value (step S3). Specifically, when the difference between the measured value and the target value is within a predetermined allowable range, the control unit 31 controls each of the light projectors 11 so that the current light projection amounts of all the light projectors 11 are maintained as they are. A control signal is supplied to the light projectors 11 to reduce all light projectors 11 by a relatively small predetermined amount if the difference between the measured value and the target value exceeds the tolerance range and the measured value is below the target value. When the difference between the measured value and the target value exceeds the allowable range and the measured value exceeds the target value, the A control signal is supplied to each light projector 11 so that the amount of light projected by all the light projectors 11 is reduced by a predetermined amount. After that, the process returns to step S1, and steps S1 to S3 are repeated.

In the present embodiment, the light projection amount is changed by the relatively small predetermined amount in one step S3. The amount of light projected by the light projector 11 may be changed.

According to the present embodiment, the measurement unit 12 measures the brightness of the surface to be illuminated, and the control unit 31 adjusts the brightness of the surface to be illuminated to the target brightness based on the brightness measured by the measurement unit. Since the amount of light projected from the light projecting unit is controlled so as to approach the brightness of the light projecting unit, the brightness of the surface to be illuminated does not become excessively bright even before sunset. Life can be extended.

[Second embodiment]

FIG. 4 is a schematic diagram schematically showing an arrangement example in the stadium 2 of each part of the lighting device 101 according to the second embodiment of the present invention, and corresponds to FIG. In FIG. 4, elements that are the same as or correspond to elements in FIG. 2 are denoted by the same reference numerals, and overlapping descriptions thereof are omitted.

The illumination device 101 according to the present embodiment differs from the illumination device 1 according to the first embodiment in that the measurement unit 12 for measuring the brightness of the illuminated surface is replaced with the camera 41 and the image processing unit 42, An illuminance meter 43 provided at a position near the home plate in the stand 2b is used, and the illuminance value measured by the illuminance meter 43 is used as a measurement value indicating the brightness of the illuminated surface, and the target of the brightness of the illuminated surface is used. The point is that the target illuminance value at the position of the illuminance meter 43 is used as the value.

This embodiment also provides advantages similar to those of the first embodiment.

[Third Embodiment]

FIG. 5 is a schematic perspective view schematically showing an arrangement example in the stadium 2 of each part of the lighting device 111 according to the third embodiment of the present invention, together with the occurrence of the shadow 301 in the stadium 2. be. FIG. 6 is a schematic cross-sectional view schematically showing how a shadow 301 is generated in the stadium 2 provided with the illumination device 111 according to this embodiment. FIG. 7 is a schematic plan view schematically showing individual regions R1 to Rn on the surface to be illuminated, which illumination device 111 according to the present embodiment uses. FIG. 8 schematically shows how light is projected mainly to one region among the plurality of regions R1 to Rn shown in FIG. 2 is a schematic perspective view shown in FIG.

In FIGS. 5 to 8, elements that are the same as or correspond to elements in FIGS. 1 and 2 are denoted by the same reference numerals, and overlapping descriptions thereof are omitted. Note that the schematic block diagram showing the lighting device 111 according to the present embodiment is the same as FIG. 1 (the schematic block diagram showing the lighting device 1 according to the first embodiment), so please refer to FIG.

When the sun is tilted in the evening and the sun 300 is positioned as shown in FIG. 6, a shadow 301 of the stand 2b is partially formed on the field surface 2a forming part of the surface to be illuminated. As the sun further declines, the area of the shadow 301 gradually expands.

In the illumination device 1 according to the first embodiment, the average value of the luminance values of the partial region R0 of the field surface 2a is obtained as a measured value indicating the brightness of the surface to be illuminated, and based on the measured value Since the amount of light projected from all the light projectors 11 is uniformly controlled, the brightness difference between the shadow 301 portion and the sunny portion does not change.

On the other hand, the illumination device 111 according to the present embodiment can reduce the brightness difference caused by the shadow 301 caused by natural light. The lighting device 111 according to the present embodiment differs from the lighting device 1 according to the first aspect in the following points.

In the illumination device 1 according to the first embodiment, the camera 41 of the measurement unit 12 captures an image including the partial region R0 of the field surface 2a. The camera 41 of the unit 12 captures an image including the entire field surface 2a. Then, in the illumination device 1 according to the first embodiment, the image processing unit 42 of the measurement unit 12 calculates the average value of the luminance values of the region R0 based on the image captured by the camera 41 as In the illumination device 111 according to the present embodiment, the image processing unit 42 of the measurement unit 12 obtains a measured value indicating brightness, based on the image captured by the camera 41, as shown in FIG. For each of n regions R1 to Rn obtained by dividing the field surface 2a by a predetermined number of vertical imaginary lines 201 and a predetermined number of horizontal imaginary lines 202, the brightness of the area is calculated as the average luminance value of the area. obtained as a measurement value indicating Note that when the n regions R1 to Rn are not distinguished from each other, R is added as a region code.

As described above, each light projector 11 corresponds to one of the plurality of areas of the surface to be illuminated, and its orientation is set so as to mainly project light to the corresponding area. In the present embodiment, one or more projectors 11 out of the projectors 11-1 to 11-N correspond to each of the regions R1 to Rn, and each of the regions R1 to Rn corresponds to the corresponding region. Light is projected from the one or more light projectors 11 . FIG. 8 shows a total of four light projectors 11, each of which is provided on four pedestals 52 of light projectors 11-1 to 11-N for one region R of regions R1 to Rn. , and shows how the four light projectors 11 corresponding to the one region R project light onto the one region R. FIG.

In this embodiment, for each of the n regions R1 to Rn, information identifying one or more projectors 11 corresponding to the region R (hereinafter referred to as "corresponding projector identification information") is stored. stored in section 32 .

In the illumination device 1 according to the first embodiment, the target value of the brightness of the surface to be illuminated (in this embodiment, specifically, the average value of the brightness values of the target region R0) is stored in the storage unit. 32, in the lighting device 111 according to the present embodiment, each of the n regions R1 to Rn is stored in the target value of the brightness of the region R (specifically, in the present embodiment, , the average value of the brightness values of the target region R) is stored in the storage unit 32 .

In the lighting device 1 according to the first embodiment, the control unit 31 controls the target value stored in the storage unit 32 as the average value of the brightness values of the region R0 based on the measurement values obtained by the measurement unit 12. is given to the drive circuit 22 of each light projector 11 so as to approach Based on the measured values, the projector 11 corresponding to the region (this is the corresponding projector identification information) is adjusted so that the average value of the luminance values of the region R approaches the target value of the region R recorded in the storage unit 32. ) controls the amount of light projected by at least one of the light projectors 11 .

Among the light projectors 11-1 to 11-N, the light projector 11 that projects light only to the stand 2b, does not project light to the field surface 2a, and does not correspond to any of the n regions R1 to Rn is, for example, The amount of light may be always projected at a predetermined amount, or the amount of light may be controlled according to the average value of the measured brightness values of the n regions R1 to Rn, or may be controlled by other methods. You may

FIG. 9 is a schematic flow chart showing an example of the operation of lighting device 111 according to the present embodiment.

When the illumination device 111 according to the present embodiment starts to operate, first, the measuring unit 12 calculates the average luminance value of each of the n regions R1 to Rn as the brightness of the region R. (step S11).

Next, the control unit 31 compares the measured value of the region R obtained in step S11 with the target value of the region R stored in the storage unit 32 for each of the n regions R1 to Rn. (Step S12), for each of the n regions R1 to Rn, the value indicating the brightness of the region R (in the present embodiment, the average value of the luminance values of the region R) is The amount of light emitted from at least one of the light projectors 11 (identified based on the corresponding light projector identification information) corresponding to the region R is controlled so as to match the target value (step S13). . Specifically, for example, for each of the n regions R1 to Rn, the control unit 31 determines that the difference between the measured value of the region R and the target value of the region R is within a predetermined allowable range. In some cases, a control signal is supplied to the light projectors 11 corresponding to the region R so that the current light projection amount of all the light projectors 11 corresponding to the region R is maintained as it is, and the measured value of the region R and the When the difference from the target value of the region R exceeds the allowable range and the measured value of the region R is lower than the target value of the region R, the region R is corresponded by a relatively small predetermined amount. A control signal is supplied to the light projector 11 corresponding to the region R so that the amount of light projected by all the light projectors 11 increases, and the difference between the measured value of the region R and the target value of the region R is within the allowable range. and the measured value of the region R exceeds the target value of the region R, the region R is adjusted so that the amount of light projected by all the light projectors 11 corresponding to the region R is reduced by the predetermined amount. A control signal is supplied to the projector 11 corresponding to . After that, the process returns to step S11, and steps S11 to S13 are repeated.

In the present embodiment, the light projection amount is changed by the relatively small predetermined amount in one step S13. The amount of light projected by the light projector 11 may be changed.

According to this embodiment, as in the first embodiment, the brightness of the surface to be illuminated does not become excessively bright even before sunset. Life can be extended.

Further, according to the present embodiment, the measurement unit 12 measures the brightness of each of the n regions R1 to Rn, and the control unit 31 measures the brightness of each of the n regions R1 to Rn. each time, based on the brightness of the region R measured by the measuring unit 12, the light projector 11 corresponding to the region R is adjusted so that the brightness of the region R approaches the target brightness of the region R. Since the amount of light projected from at least one light projector 11 is controlled, the amount of light projected from the light projector 11 for the part of the shadow 301 due to natural light increases, while the amount of light projected from the light projector 11 for the part of the sun due to natural light decreases. Therefore, according to the present embodiment, the light-dark contrast on the illuminated surface, which is produced only by natural light in the evening, etc., is reduced by the amount of light projected for each region, and the shadow caused by the natural light is reduced. Brightness and darkness can be reduced, and higher quality lighting can be achieved.

[Fourth Embodiment]

FIG. 10 is a schematic block diagram showing a lighting device 121 according to a fourth embodiment of the invention and corresponds to FIG. In FIG. 10, elements that are the same as or correspond to elements in FIG.

The illumination device 121 according to the present embodiment is obtained by modifying the illumination device 111 according to the third embodiment as described below.

In the present embodiment, an operation unit 61 is added so that the operation unit 61 can be used to select either the first operation mode or the second operation mode.

In the illumination device 111 according to the third embodiment, only one set of brightness target values for the n regions R1 to Rn is stored in the storage unit 32. In the device 121, a plurality of sets of brightness target values for the n regions R1 to Rn are stored in the storage unit 32. FIG.

In the present embodiment, in the first operation mode, a set of brightness target values for the n regions R1 to Rn used in step S12 in FIG. One of a plurality of sets of brightness target values of the n regions R1 to Rn in which the values are displayed can be selected by a predetermined operation command from the operation unit 61. FIG.

In this first operation mode, the brightness distribution on the field surface 2a is represented by one set selected by the operation unit 61 from a plurality of sets of brightness target values of the n regions R1 to Rn. can be

Therefore, in this first operation mode, for example, when one of a plurality of types of games (for example, baseball and soccer) is selectively played in the stadium, the above-described brightness distribution showing the brightness distribution respectively suitable for each game is selected. By preparing a plurality of sets of target brightness, a brightness distribution suitable for each competition can be obtained. Further, in the first operation mode, for example, a brightness distribution suitable for performing track and field events at the same time at a track and field stadium, and only a track portion is adjusted so as to draw attention to the track event when only track events are performed. prepare a plurality of sets of the target brightnesses, each showing a brightness distribution that brightens the field, and a brightness distribution that brightens only the field part so as to draw attention only to the field competition when only the field competition is held. By doing so, the brightness distribution suitable for each can be obtained. Further, in the first operation mode, for example, in the case of a stadium having a plurality of tennis courts, a brightness distribution suitable for simultaneous matches on a plurality of tennis courts, and a single tennis court for a final game, etc. By preparing a plurality of target brightness sets each showing a brightness distribution that brightens only the tennis court so as to draw attention to the target brightness, a brightness distribution suitable for each can be obtained. Further, in the first operation mode, for example, in a soccer field, a plurality of sets of target brightness are prepared, each of which represents a brightness distribution suitable during a game and a brightness distribution suitable for a halftime show. Thus, a brightness distribution suitable for each can be obtained.

Further, in the present embodiment, in the second operation mode, target brightness of the n regions R1 to Rn used in step S12 in FIG. The value can be set variably.

In this second operation mode, the brightness distribution of the field surface 2a can be variably set according to a predetermined instruction operation of the operation unit 61. FIG. Therefore, in the second operation mode, the brightness distribution of the field surface 2a can be appropriately changed according to the situation, etc., and various illuminations can be performed.

In the present embodiment, either one of the first and second operation modes can be selected. However, in the present invention, only one of the operation modes is performed. You may

Although each embodiment of the present invention has been described above, the present invention is not limited to these embodiments.

For example, the lighting system according to the present invention can be installed not only in outdoor stadiums, but also in dome-shaped stadiums whose ceilings can be opened and closed, and dome-shaped stadiums whose ceilings are made up of curtains having a certain degree of translucency. Alternatively, it may be provided not only in stadiums but also in event venues, concert venues, and the like.

1, 101, 111, 112 lighting device 11, 11-1 to 11-N projector 12 measurement unit 31 control unit 32 storage unit

Claims (7)

a light projecting unit that projects light onto an illuminated surface that can directly or indirectly receive natural light;
a measuring unit that measures the brightness of the illuminated surface;
a control unit that controls the amount of light projected by the light projecting unit so that the brightness of the surface to be illuminated approaches a target brightness based on the brightness measured by the measuring unit;
with
The light projecting unit includes a plurality of light projectors, each light projector corresponding to one of the plurality of areas of the surface to be illuminated and mainly projecting light to the corresponding area. ,
The measurement unit measures the brightness of each of the plurality of regions of the surface to be illuminated,
For each of the plurality of areas, the control unit adjusts the brightness of the area based on the brightness of the area measured by the measurement unit so that the brightness of the area approaches the target brightness of the area. controlling the light projection amount of at least one of the corresponding light projectors;
a storage unit that stores a plurality of sets of the target brightness of the plurality of regions; and a selection unit that selects one of the plurality of sets to be used by the control unit according to a command. ,
A lighting device characterized by: 2. The lighting device according to claim 1, wherein the command is a predetermined operation command from an operation unit. a light projecting unit that projects light onto an illuminated surface that can directly or indirectly receive natural light;
a measuring unit that measures the brightness of the illuminated surface;
a control unit that controls the amount of light projected by the light projecting unit so that the brightness of the surface to be illuminated approaches a target brightness based on the brightness measured by the measuring unit;
with
The light projecting unit includes a plurality of light projectors, each light projector corresponding to one of the plurality of areas of the surface to be illuminated and mainly projecting light to the corresponding area. ,
The measurement unit measures the brightness of each of the plurality of regions of the surface to be illuminated,
For each of the plurality of areas, the control unit adjusts the brightness of the area based on the brightness of the area measured by the measurement unit so that the brightness of the area approaches the target brightness of the area. controlling the light projection amount of at least one of the corresponding light projectors;
A setting means for variably setting the target brightness of the plurality of areas according to a command,
A lighting device characterized by: 4. The lighting device according to claim 3, wherein the command is a predetermined operation command from an operation unit. 2. The measurement unit comprises imaging means for imaging the surface to be illuminated, and means for obtaining values indicating the brightness of the plurality of areas based on the image captured by the imaging means. 5. The lighting device according to any one of 1 to 4. The illumination device according to any one of claims 1 to 5, wherein the measurement unit uses luminance as the brightness. The lighting device is a stadium lighting device,
7. The illumination device according to any one of claims 1 to 6, wherein the surface to be illuminated includes a field surface of a stadium.

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