JP7506320B2 - Lighting equipment - Google Patents

Description

The present invention relates to a lighting device.

Lighting devices are known for use in performance spaces such as TV studios and theater stages. In recent years, lighting devices that use LEDs or the like as light sources have become known. Patent Document 1 describes a lighting device that includes a light source, a rod lens, a reflector, and a projection lens system.

JP 2013-164916 A

The purpose of this embodiment is to provide a highly efficient lighting device that can reduce uneven illuminance depending on the height of the object.

The lighting device according to one aspect of the present invention comprises a camera with a lens, a sensor that detects light incident from the lens of the camera and converts it into an electrical signal with an installed light quantity sensor to transmit the data in order to detect the individual spatial positions of multiple measurement points defined on the object, a plurality of lighting modules in which a plurality of light emitting devices are arranged in a matrix or staggered pattern, and a control device that adjusts the light quantity of each of the plurality of light emitting devices so that when light is irradiated onto a first object surface a predetermined distance away from the plurality of lighting modules in accordance with data from the sensor, the sum of the light quantities per unit area of the overlapping portions of the light on the first object surface is within ±20% of the light quantity per unit area of the non-overlapping portions.

One of the lighting devices according to another aspect of the present invention includes a camera with a lens, a sensor that detects light incident from the lens of the camera to detect the individual spatial positions of multiple measurement points defined on the object, converts the light into an electrical signal using an installed light quantity sensor, and transmits the data, a plurality of lighting modules in which a plurality of light-emitting devices are arranged in a matrix or staggered pattern, and a control device that adjusts the light quantity of each of the plurality of light-emitting devices so that when light is irradiated onto a first object surface that is a predetermined distance away from the plurality of lighting modules in accordance with data from the sensor, the sum of the light quantities per unit area of the overlapping portions of the light on the first object surface is within ±40% of the light quantity per unit area of the non-overlapping portions, and when a second object surface is assumed to be between the lighting module and the first object surface, the sum of the light quantities per unit area of the overlapping portions of the light on the second object surface is within ±30% of the light quantity per unit area of the non-overlapping portions.

This embodiment can provide a highly efficient lighting device that can reduce uneven illuminance depending on the height of the object.

1 is a schematic perspective view showing a lighting module according to a first embodiment. 1 is a schematic cross-sectional view showing a lighting module according to a first embodiment. 1 is a schematic perspective view showing a portion of a lighting module according to a first embodiment. FIG. 2 is a schematic plan view showing a light-emitting device and a control device inside the lighting module according to the first embodiment. FIG. 2 is a schematic cross-sectional view showing the arrangement of the light emitting device and rod lenses according to the first embodiment. FIG. 4 is a photograph showing a state in which light is irradiated onto a first target surface from the lighting device according to the first embodiment. 3 is a schematic diagram showing a state in which light is irradiated onto a first target surface from the lighting device according to the first embodiment. FIG. 3 is a schematic diagram showing a state in which light is irradiated onto a first target surface from the lighting device according to the first embodiment. FIG. 3 is a schematic diagram showing a state in which light is irradiated onto a first target surface from the lighting device according to the first embodiment. FIG. 4 is a diagram showing a cross-sectional intensity of irradiation on a first target surface when light is irradiated onto the first target surface from the lighting device according to the first embodiment; FIG. 5 is a diagram showing a cross-sectional intensity of irradiation on a virtual second target surface when light is irradiated from the lighting device according to the first embodiment to a first target surface. FIG. 5 is a diagram showing a cross-sectional intensity of irradiation on a virtual third target surface when light is irradiated from the lighting device according to the first embodiment to a first target surface. FIG. 13 is a schematic diagram showing a state in which light is irradiated onto a first target surface from an illumination device according to a second embodiment. FIG. 14 is a partially enlarged view of FIG. 13 , illustrating a state of light near the exit point when light is irradiated onto a first target surface from an illumination device according to a second embodiment. 13 is a diagram showing a cross-sectional intensity of irradiation on a first target surface when the first target surface is irradiated with light from an illumination device according to a second embodiment. FIG. 13 is a diagram showing a cross-sectional intensity of irradiation on a virtual second target surface when light is irradiated onto a first target surface from an illumination device according to a second embodiment. FIG. 13 is a diagram showing a cross-sectional intensity of irradiation on a virtual third target surface when light is irradiated from the lighting device according to the second embodiment to a first target surface. FIG. FIG. 13 is a schematic diagram showing a state in which light is irradiated onto a first target surface from an illumination device according to a third embodiment. 19 is a partially enlarged view of FIG. 18 , illustrating a state of light near the exit point when light is irradiated onto a first target surface from an illumination device according to a third embodiment. 13 is a diagram showing a cross-sectional intensity of irradiation on a first target surface when the first target surface is irradiated with light from an illumination device according to a third embodiment. FIG. 13 is a diagram showing a cross-sectional intensity of irradiation on a virtual second target surface when a first target surface is irradiated with light from a lighting device according to a third embodiment. FIG. 13 is a diagram showing a cross-sectional intensity of irradiation on a virtual third target surface when light is irradiated onto a first target surface from a lighting device according to a third embodiment. FIG. 1 is a schematic diagram of a lighting device in which lighting modules are arranged in a matrix. FIG. 4 is a schematic diagram showing projection conditions of the lighting devices of the example and the comparative example. 4 is a photograph showing an irradiation state in Example 1. FIG. 1 is a diagram showing cross-sectional intensity of irradiation in Example 1. 4 is a photograph showing an irradiation state in Comparative Example 1. FIG. 13 is a diagram showing cross-sectional intensity of irradiation in Comparative Example 1.

The following describes a lighting device and a manufacturing method thereof according to an embodiment. The drawings referred to in the following description are schematic diagrams of the embodiment, and therefore the scale, spacing, and positional relationships of each component may be exaggerated, or some components may not be shown. The scale and spacing of each component may not match between the plan view and its cross-sectional view. In the following description, the same names and symbols generally indicate the same or similar components, and detailed descriptions will be omitted as appropriate. In this specification, terms such as "upper" and "lower" indicate the relative positions of components, and are not intended to indicate absolute positions.

The relationship between color names and chromaticity coordinates, and the relationship between light wavelength ranges and monochromatic light color names, etc., follow JIS Z8110. Specifically, 380nm to 410nm is purple, 410nm to 455nm is blue-purple, 455nm to 485nm is blue, 485nm to 495nm is blue-green, 495nm to 548nm is green, 548nm to 573nm is yellow-green, 573nm to 584nm is yellow, 584nm to 610nm is yellow-red, and 610nm to 780nm is red.

In this specification, wavelengths shorter than 380 nm are considered to be in the ultraviolet region, 200 nm to 380 nm are considered to be near ultraviolet, and 10 nm to 200 nm are considered to be far ultraviolet. 780 nm to 1 mm is considered to be infrared.

The height of the lighting equipment will be described as 4.5m as an example for a theater stage, but it can also be 3m to 20m and is not limited to this.

The first object surface is, for example, the floor of a theater stage. The second object surface is 1.5 m above the first object surface, and is, for example, a flat surface at a height of 1.5 m above the floor of a theater stage. For example, taking a person who is about 170 cm tall, the height of the face corresponds to about 150 cm. The third object surface is 1 m above the first object surface, and is, for example, a flat surface at a height of 1 m above the floor of a theater stage. For example, taking a person who is 170 cm tall, the height of the abdomen corresponds to about 100 cm. The fourth object surface is 1.69 m above the first object surface, and is, for example, a flat surface at a height of 1.5 m above the floor of a theater stage. For example, taking a person who is 170 cm tall, the height of the abdomen corresponds to about 100 cm.

First embodiment The lighting device according to the first embodiment will be described with reference to the drawings. FIG. 1 is a schematic perspective view showing a lighting module according to the first embodiment. FIG. 2 is a schematic cross-sectional view showing a lighting module according to the first embodiment. FIG. 3 is a schematic perspective view showing a part of a lighting module according to the first embodiment. FIG. 4 is a schematic plan view showing a light-emitting device and a control device inside a lighting module according to the first embodiment. FIG. 5 is a schematic cross-sectional view showing an arrangement of a light-emitting device and a rod lens according to the first embodiment. FIG. 6 is a photograph showing a state in which light is irradiated from a lighting device according to the first embodiment to a first target surface. FIG. 1 shows a lamp in which four lighting modules are arranged in one box. The number of lighting modules for one lamp is not limited to one, and multiple lighting modules may be provided.

The lighting device 100 according to the first embodiment includes a camera 60 with a lens 65, a sensor 70 that detects light incident from the lens 65 of the camera 60 to detect the individual spatial positions of a plurality of measurement points defined on the object, converts the light into an electrical signal using a mounted light quantity sensor, and transmits the data, a plurality of lighting modules 50 in which a plurality of light-emitting devices 10 are arranged in a matrix or staggered pattern, and a control device 30 that adjusts the light quantity of each of the plurality of light-emitting devices 10 so that when light is irradiated onto a first object surface R1 at a predetermined distance from the plurality of lighting modules 50 according to data from the sensor 70, the sum of the light quantities per unit area of the overlapping portions of the light on the first object surface R1 is within ±20% of the light quantity per unit area of the portions where the light does not overlap. By detecting the object using the sensor 70 through the lens 65 of the camera 60, a highly efficient lighting device that can reduce uneven illuminance according to the height, size, etc. of the object can be provided. Here, "per unit area" is a square of 200 mm x 200 mm. However, depending on the distance from the lighting module to the first target surface, it may be between 100 mm x 100 mm and 1000 mm x 1000 mm, etc.

The object is not limited to a person, but may be an animal, object, or anything. For example, even if the object is a person, the height and size of the object may differ between children and adults, and appropriate illumination may not be possible. For example, when an illumination device illuminates the face of a 170 cm adult from an oblique upward direction, the light is illuminated at a height of 150 cm to 170 cm. On the other hand, if a 120 cm child comes to the same position instead of the 170 cm adult, the light illuminated at the same height will not illuminate the child's face or the whole body. In a similar situation, if a 200 cm adult comes to the same position instead of the 170 cm adult, the light illuminated at the same height may illuminate the chest to abdomen of the 200 cm adult, and may not illuminate the face position at a height of 180 cm to 200 cm. Therefore, if the illumination position is set at a constant height even though the illumination target changes when the height or size of the object changes, the object cannot be illuminated appropriately. Therefore, the present disclosure provides a lighting device that can be adjusted to provide an appropriate illumination position depending on the height, size, position, and movement of the object.

In order to detect the height and size of the object, a camera 60 with a lens 65 is prepared. The camera 60 receives light irradiated on the object and light from the surroundings other than the object through the lens 65. The camera 60 is used in combination with a sensor 70 that detects the light incident from the lens 65 of the camera 60, converts it into an electrical signal with a mounted light quantity sensor, and transfers the data to the control device 30. The camera 60 and the sensor 70 are preferably arranged in the same housing, but the camera 60 and the sensor 70 may be arranged separately. The camera 60 may be arranged in a position where the object can be easily detected, for example, above, diagonally above, horizontally, forward, backward, diagonally below, etc. The number of cameras 60 is not limited to one, and multiple cameras may be used, and the size of the camera 60 is not particularly limited. The lens 65 of the camera 60 can be a convex lens, a concave lens, etc., and the shape and number of lenses are not limited.

The spatial positions of the multiple measurement points defined on the object detected by the camera 60 can be set arbitrarily, and for a human or animal, these could be the head, face, chest, abdomen, both hands, elbows, both feet, and both knees, and for an animal, the tail or wings. It is preferable to detect these spatial positions in three dimensions, not just two. This is because the object moves up and down, left and right, and forward and backward, so the spatial position changes.

In one lighting module 50, a plurality of light emitting devices 10 are arranged in a matrix or staggered pattern on a substrate 20. The plurality of light emitting devices 10 may be arranged in a two-dimensional matrix. In addition, a control device 30 is arranged on the substrate 20 on the outer periphery of the light emitting devices. This control device 30 may be arranged inside the lighting module 50, or may be arranged separately from the lighting module 50. A rod lens 25 is arranged for each of the plurality of light emitting devices 10 arranged on the substrate 20. The rod lens 25 has a role of narrowing the orientation from the light emitting device 10, or a role of making the light from the light emitting device 10 uniform. The rod lens 25 has an entrance surface facing the light emitting device and an exit surface that emits the light that entered from the entrance surface to the outside. The rod lens 25 may be tapered so that the exit surface has a larger area than the entrance surface. One rod lens 25 is provided for one light emitting device 10, but multiple light emitting devices 10 may be provided for one rod lens 25. The rod lens 25 may be provided for a plurality of light emitting devices 10, or a rod lens unit having a plurality of entrance surfaces and one exit surface may be formed. By using a rod lens unit, it is not necessary to attach the rod lens 25 to each light emitting device 10 individually, so that the rod lens 25 can be easily arranged on the light emitting device 10. The light emitting device 10 and the rod lens 25 may be arranged with a gap therebetween, or may be directly joined. The lighting module 50 has a lens 40 arranged on the top of the light emitting device 10. The lens 40 may be a convex lens, a concave lens, or a combination of multiple lenses. The lens 40 may be either a fixed type or a variable type.

The number of light-emitting devices 10 can be set appropriately according to the size of the first target surface R1 to be irradiated, and can be, for example, 6 x 6, 8 x 8, 10 x 10, 6 x 10, or 10 x 20. The light-emitting devices arranged in a matrix or staggered pattern are not limited to squares or rectangles, but can also be polygonal, such as triangular, pentagonal, or hexagonal, or trapezoidal, parallelogram, approximately circular, or approximately elliptical. The light-emitting device may be only a semiconductor light-emitting element such as a light-emitting diode, or may be a semiconductor light-emitting element with a wavelength conversion member disposed thereon. By combining a semiconductor light-emitting element with a wavelength conversion member, it is possible to realize multiple colors such as warm colors, cool colors, blue, green, yellow, and red in addition to white and daylight white. It is preferable that the multiple light-emitting devices are composed of two or more types with different color temperatures.

For example, when a lighting device using three lighting modules is used to illuminate the first target surface R1, which is the floor surface of a theater stage, a lighting device with small illuminance unevenness and high efficiency can be provided. Suspension lights used in stage lighting usually have lighting modules with a wide orientation that are less likely to cause illuminance unevenness, but because the orientation is wide, it is possible that the lighting module will illuminate things other than the performers or objects to be illuminated. On the other hand, narrowing the orientation and overlapping the light is likely to cause illuminance unevenness. In contrast, the lighting device of this embodiment has a narrow orientation and has a high luminous flux even when the light is overlapped, making it less likely to cause illuminance unevenness. By driving the light-emitting devices individually, it is possible to reduce illuminance unevenness on the first target surface R1.

The lighting device according to the first embodiment will be described using an example of a lighting device using two lighting modules. For convenience in explaining the invention, the lighting device has two lighting modules, but the number of lighting modules is not limited to this. Figure 7 is a schematic diagram showing the state in which light is irradiated from the lighting device according to the first embodiment onto the first target surface.

When the distance between the lighting device and the first target surface R1 does not change, the first target surface R1 may be used as the reference surface, or, as in the case where the distance between the lighting device and the first target surface R1 changes, the first target surface R1 may be used as one of the spatial positions defined on the object. Here, the plane defined by the X-axis direction and the Y-axis direction perpendicular to the X-axis direction is used as the reference surface, and the direction perpendicular to the X-axis/Y-axis plane is used as the Z-axis direction.

The lighting device 100 has one camera 60 with a lens 65, one sensor 70, two control devices 30, and two lighting modules 50. The sensor 70 is arranged inside the camera 60. A person will be used as an example of the object. Light is irradiated onto the object, and light reflected from the object and surrounding light other than the object are made to enter through the lens 65 of the camera 60. The sensor 70 detects the light incident from the lens 65 of the camera 60, and the mounted light quantity sensor converts it into an electrical signal, and transfers the data to the control device 30. The sensor 70 detects the individual spatial positions of at least two measurement points defined on the object by the light incident from the lens 65. Here, the face of the person, which is the object, is the first measurement point, and the abdomen is the second measurement point. The X, Y, and Z coordinates of the height of the feet of a 170 cm person standing, 0 cm, the position of the face, and 100 cm, the position of the abdomen, and the location where the person is standing are defined. The coordinates are converted in mm units. For example, the coordinates of the feet of a 170 cm person standing are (X, Y, Z) = (0, 0, 0), the coordinates of the face position at 150 cm are (X, Y, Z) = (0, 0, 1500), and the coordinates of the abdomen position at 100 cm are (X, Y, Z) = (0, 0, 1000). The height of the second object plane R2 based on the first object plane R1 is, for example, 1.5 m from the first object plane R1. The height of the third object plane R3 is, for example, 1 m from the first object plane R1. That is, when the first target surface R1 to the third target surface R3 are expressed by X, Y, and Z coordinates, the first target surface R1 is (X, Y, Z) = (arbitrary, arbitrary, 0), the second target surface R2 is (X, Y, Z) = (arbitrary, arbitrary, 1500), and the third target surface R3 is (X, Y, Z) = (arbitrary, arbitrary, 1000), and each is a plane. In addition, the positions of the two lighting modules 50 are defined in advance as X, Y, and Z coordinates. In addition, when a person moves 100 cm forward and 100 cm to the right while standing, the coordinates of the face position are (X, Y, Z) = (1000, 1000, 1500), and the coordinates of the 100 cm position of the abdomen are (X, Y, Z) = (1000, 1000, 1000). In this way, the control device 30 adjusts the amount of light of the light-emitting device 10 according to the data of the X, Y, and Z coordinates from the sensor 70, and each lighting module 50 irradiates light toward the first target surface R1. When the two lighting modules 50 are caused to emit light, the first target surface R1 has portions A and C where the light does not overlap, and a portion B where the light overlaps. If the amount of light irradiating the first target surface R1 in each of the two lighting modules 50 is the same, the amount of light per unit area in the overlapping portion B of the light is twice as much as the amount of light per unit area in the non-overlapping portions A and C of the light. In contrast, the lighting device of this embodiment can control the amount of light irradiated from the lighting module 50 to the first target surface R1 for each individual light-emitting device 10 by individually driving each light-emitting device in each lighting module 50. This allows the sum of the amount of light from the two lighting modules 50 in the overlapping portion B of the light to approach the amount of light in the non-overlapping portions A and C of the light. Here, the amount of light emitted from the two lighting modules 50 in the overlapping portion B does not have to be equal, and the amount of light from one lighting module can be increased and the amount of light from the other lighting module can be decreased to within a predetermined range. For example, by increasing the amount of light from one lighting module, it is possible to add shading to the illuminated person, etc. In other words, there is no unevenness in the illuminance on the first target surface R1, but the front side of the person can be illuminated brightly and the back side of the person can be illuminated darkly.

It is preferable that the lighting device 100 has no unevenness in illuminance even on the second target surface R2, which is a predetermined distance away from the first target surface R1. By increasing the height of the second target surface R2 without changing the distance from the lighting module 50 to the first target surface R1, the irradiation angle of the lighting module 50 can be expanded.

It is preferable that the lighting device 100 has no unevenness in illuminance even on the third target surface R3, which is a predetermined distance away from the first target surface R1. By using the third target surface R3, which is located lower than the second target surface R2, as a reference without changing the distance from the lighting module 50 to the first target surface R1, the irradiation angle of the lighting module 50 can be narrowed.

The lighting device according to the first embodiment will be described using an example of a lighting device using two lighting modules. For convenience of explaining the invention, the lighting device has two lighting modules, but the number of lighting modules is not limited to this. FIG. 8 is a schematic diagram showing a state in which light is irradiated from the lighting device according to the first embodiment onto a first target surface. In FIG. 8, a portion of the first lighting module and the second lighting module are enlarged, but for convenience of explanation, the illustration is exaggerated. Unlike the case of FIG. 7, the lighting device of FIG. 8 differs in that the light emitted from the lighting modules is further individually controlled according to the irradiation distance and the light amount.

The lighting module has a first lighting module 51 having at least a first light-emitting device 10a and a second light-emitting device 10b. When light is irradiated from the first lighting module 51 to a first target surface R1 that is a predetermined distance away, in the overlapping portion B of light on the first target surface R1, if the first distance e1 from the first light-emitting device 10a to the first target surface R1 irradiated by the first light-emitting device 10a is longer than the second distance e2 from the second light-emitting device 10b to the first target surface R1 irradiated by the second light-emitting device 10b, it is preferable to make the light amount of the first light-emitting device 10a lower than the light amount of the second light-emitting device 10b.

The lighting module has a second lighting module 52 having at least a third light-emitting device 10c and a fourth light-emitting device 10d. The second lighting module 52 is adjacent to the first lighting module 51 on the first light-emitting device 10a side. When light is irradiated from the second lighting module 52 to a first target surface R1 that is a predetermined distance away, in the overlapping portion B of light on the first target surface R1, if the third distance e3 from the third light-emitting device 10c to the first target surface R1 irradiated by the third light-emitting device 10c is longer than the fourth distance e4 from the fourth light-emitting device 10d to the first target surface R1 irradiated by the fourth light-emitting device 10d, it is preferable that the light amount of the third light-emitting device 10c is lower than the light amount of the fourth light-emitting device 10d.

This allows the sum of the light amount of the first light-emitting device 10a and the fourth light-emitting device 10d to be approximately equal to the sum of the light amount of the second light-emitting device 10b and the third light-emitting device 10c. This reduces uneven illuminance. With lighting modules such as halogen bulbs, it is not possible to individually control the irradiated areas, so uneven illuminance is likely to occur. In contrast, uneven illuminance can be reduced by using multiple light-emitting devices and individually controlling them with a control device. In addition, by combining the camera 60 and the sensor 70, even if the X, Y, and Z coordinates representing the individual spatial positions of the multiple measurement points defined on the object change due to the movement of the object, the appropriate irradiation position can be secured by controlling the individual illuminance of the lighting module 50 according to the values, and uneven illuminance can be reduced.

The relationship between the first light-emitting device 10a and the second light-emitting device 10b in plan view may be such that the side closer to the center of the plurality of light-emitting devices is the second light-emitting device 10b, and the side closer to the periphery of the plurality of light-emitting devices is the first light-emitting device 10a. This allows most of the light emitted from the first light-emitting device 10a and the second light-emitting device 10b to irradiate the first target surface R1 without overlapping. The relationship between the third light-emitting device 10c and the fourth light-emitting device 10d is similar to the relationship between the first light-emitting device 10a and the second light-emitting device 10b, and the relationship between the third light-emitting device 10c and the fourth light-emitting device 10d in plan view may be such that the side closer to the center of the plurality of light-emitting devices is the fourth light-emitting device 10d, and the side closer to the periphery of the plurality of light-emitting devices is the third light-emitting device 10c. This allows most of the light emitted from the third light-emitting device 10c and the fourth light-emitting device 10d to irradiate the first target surface R1 without overlapping. Although the light beam is shown as a straight line in the drawing, it has a certain width and irradiates a certain range.

The light intensity per unit area of non-overlapping parts A and C and overlapping part B is preferably within ±20%, more preferably within ±15%, and particularly preferably within ±10%. In addition, since the light intensity per unit area from the first lighting module 51 differs in each of overlapping parts B1, B2, and B3, it is preferable to control the light intensity of each light-emitting device with a control device. In addition, in overlapping part B, the distance from the light-emitting device 10 of each of the first lighting module 51 and the second lighting module 52 to the first target surface R1 differs slightly, so it is preferable to control the light intensity of each light-emitting device according to the distance.

The rod lenses 25 provided in the first light-emitting device 10a and the second light-emitting device 10b can be configured to be inclined at a predetermined angle with respect to the first target surface R1, and the rod lenses 25 provided in the first light-emitting device 10a closer to the periphery of the plurality of light-emitting devices can be configured to be more inclined than the rod lenses 25 provided in the second light-emitting device 10b closer to the center of the plurality of light-emitting devices. This is because it is possible to expand the orientation of the first lighting module 51.

The lighting device according to the first embodiment will be described using an example of a lighting device using three lighting modules. For convenience of explaining the invention, the lighting device has three lighting modules, but the lighting device is not limited to this number. FIG. 9 is a schematic diagram showing a state in which light is irradiated from the lighting device according to the first embodiment to a first target surface. FIG. 10 is a diagram showing the cross-sectional intensity of irradiation on the first target surface when light is irradiated from the lighting device according to the first embodiment to the first target surface. FIG. 11 is a diagram showing the cross-sectional intensity of irradiation on a virtual second target surface when light is irradiated from the lighting device according to the first embodiment to the first target surface. FIG. 12 is a diagram showing the cross-sectional intensity of irradiation on a virtual third target surface when light is irradiated from the lighting device according to the first embodiment to the first target surface. However, the cross-sectional intensity in FIGS. 10 to 12 is the result of a simulation. In FIGS. 10 to 12, the horizontal axis indicates the irradiation width (mm), and the vertical axis indicates the light intensity ratio (a.u.). The camera 60, lens 65, sensor 70, and control device 30 can be the same as those in the case of two lighting modules. Even when the number of lighting modules increases from two to three, the roles of the camera, sensor, and control device remain the same.

The lighting modules include at least a third lighting module 53, a fourth lighting module 54, and a fifth lighting module 55. The third lighting module 53 and the fifth lighting module 55 are arranged in line symmetry with respect to the fourth lighting module 54. The line symmetry here is based on a line drawn from the fourth lighting module 54 to the first target surface R1 at the shortest distance. This makes it possible to make the distance between the third lighting module 53 and the fourth lighting module 54 equal to the distance between the fifth lighting module 55 and the fourth lighting module 54, making it easier to control the lighting.

It is preferable that the sum of the light quantities per unit area of the overlapping portions of the light from the third lighting module 53, the fourth lighting module 54, and the fifth lighting module 55 on the first target surface R1, the sum of the light quantities per unit area of the overlapping portions of the light from the third lighting module 53 and the fourth lighting module 54 on the first target surface R1, and the sum of the light quantities per unit area of the overlapping portions of the light from the fifth lighting module 55 and the fourth lighting module 54 on the first target surface R1 are within ±20%. This makes it possible to reduce uneven illuminance on the first target surface R1. That is, when the light amounts of the third lighting module 53, the fourth lighting module 54, and the fifth lighting module 55 are the same within the first target surface R1, the sum of the light amounts per unit area of the overlapping portions of the light from the third lighting module 53, the fourth lighting module 54, and the fifth lighting module 55 on the first target surface R1 should be greater than the sum of the light amounts per unit area of the overlapping portions of the light from the third lighting module 53 and the fourth lighting module 54 on the first target surface R1. However, by controlling the light amounts of the third lighting module 53, the fourth lighting module 54, and the fifth lighting module 55 on the first target surface R1 by the control device 30, the sum of the light amounts per unit area of the overlapping portions of the light from the third lighting module 53, the fourth lighting module 54, and the fifth lighting module 55 can be kept low. This allows the sum of the light amounts per unit area of the overlapping portions of the light from the third lighting module 53, the fourth lighting module 54, and the fifth lighting module 55 to be within ±20%. Here, the amount of light on the three irradiated surfaces on the first target surface R1 can be kept to within 5%.

In the first target surface R1, the amount of light from the fourth lighting module 54 in the overlapping portion of the light from each of the third lighting module 53, the fourth lighting module 54, and the fifth lighting module 55 may be lower than the amount of light from the fourth lighting module in the overlapping portion of the light from the third lighting module 53 and the fourth lighting module 54. This can reduce uneven illuminance in the third target surface R3. In other words, by expanding the overlapping portion of the light from the third lighting module 53 and the fourth lighting module 54 and narrowing the overlapping portion of the light from the third lighting module 53, the fourth lighting module 54, and the fifth lighting module 55, the area with high light amount in the third target surface can be expanded.

The uniformity on the second target surface R2 is 33%, and the uniformity on the third target surface R3 is also 33%. Therefore, brightness and darkness occur on the second target surface R2 and the third target surface R3. However, the area of darkness on the third target surface R3 is narrower than the area of darkness on the second target surface R2, and if the object to be irradiated is low, uneven illuminance is suppressed. Furthermore, because a light-emitting device using a semiconductor light-emitting element or the like is used, the lighting module can be made lighter, making it easier to transport and install the lighting device.

Second embodiment The illumination device according to the second embodiment will be described with reference to the drawings. FIG. 13 is a schematic diagram showing a state in which light is irradiated from the illumination device according to the second embodiment to the first target surface. FIG. 14 is a partial enlarged view of FIG. 13 showing the state of light near the exit when light is irradiated from the illumination device according to the second embodiment to the first target surface. FIG. 15 is a diagram showing the cross-sectional intensity of irradiation on the first target surface when light is irradiated from the illumination device according to the second embodiment to the first target surface. FIG. 16 is a diagram showing the cross-sectional intensity of irradiation on a virtual second target surface when light is irradiated from the illumination device according to the second embodiment to the first target surface. FIG. 17 is a diagram showing the cross-sectional intensity of irradiation on a virtual third target surface when light is irradiated from the illumination device according to the second embodiment to the first target surface. However, the cross-sectional intensity in FIGS. 15 to 17 is the result of a simulation. In FIGS. 15 to 17, the horizontal axis indicates the irradiation width (mm), and the vertical axis indicates the light intensity ratio (a.u.). The camera 60, the lens 65, the sensor 70, and the control device 30 can be the same as those of the illumination device according to the first embodiment. Even though the number of lighting modules has increased from two to three, the roles of the camera, sensor and control device remain the same.

Based on the first target surface, the lighting module is at a height of 4.5 m, the second target surface is at a height of 1.5 m, and the third target surface is at a height of 1 m. The second and third target surfaces can be changed as desired depending on the height and movement of the target object.

The lighting device 100 according to the second embodiment includes a camera 60 with a lens 65, a sensor 70 that detects light incident from the lens 65 of the camera 60 and converts it into an electrical signal with a mounted light quantity sensor to transmit the data in order to detect the individual spatial positions of a plurality of measurement points defined on the object, a plurality of lighting modules 50 in which a plurality of light-emitting devices are arranged in a matrix or staggered pattern, and a control device that adjusts the light quantity of each of the plurality of light-emitting devices so that when light is irradiated onto a first target surface R1 at a predetermined distance from the plurality of lighting modules 50 according to data from the sensor 70, the sum of the light quantities per unit area of the overlapping portions of the light on the first target surface R1 is within ±40%, preferably within ±30%, and more preferably within ±20% of the light quantity per unit area of the non-overlapping portions. This makes it possible to provide a highly efficient lighting device that can reduce uneven illuminance.

Infrared or ultraviolet light emitters 80 can be provided at multiple measurement points defined on the object. The multiple measurement points defined on the object may be, for example, the nose position on the face, the abdomen, and the hands. This allows the object to be properly illuminated even if the stage goes dark or if the person in question moves, crouches, or spreads their arms.

In addition, by providing an infrared laser or ultraviolet laser 90 along with the camera 60 and sensor 70, it is possible to recognize a person as the subject even when no infrared or ultraviolet light emitter is provided. It is also possible to detect multiple measurement points defined on the subject.

The lighting device 100 according to the second embodiment will be described with three lighting modules 50 to simplify the explanation. Unlike the lighting device according to the first embodiment, the lighting device according to the second embodiment finely sets the illuminance of a part of the lighting modules at both ends and the central lighting module in the overlapping portion of the light. By finely setting the illuminance of multiple light-emitting devices, it is possible to further reduce the unevenness of the illuminance even in the overlapping portion B of the light. For example, if the amount of light from the lighting modules at both ends in the portion where the light does not overlap is 100%, the amount of light near the center of the central lighting module is 65%, and the amount of light decreases toward the periphery to 63%, 50%, 37%, 24%, and 11%. In addition, the amount of light increases from the periphery to the center in the overlapping portion of the lighting modules at both ends to 11%, 24%, 37%, 50%, 63%, 76%, 89%, and 100%. However, the sum of the light quantity per unit area of the overlapping portions of the light on the first target surface R1, which is a predetermined distance away from the three lighting modules, is approximately the same as the light quantity per unit area of the non-overlapping portions. In other words, if the light quantity from the central lighting module is 65%, the light quantity from the right lighting module is 11%, and the light quantity from the left lighting module is 24% on the first target surface R1, the total is 100%. Similarly, if the light quantity from the central lighting module is 63% and the light quantity from the right lighting module is 37%, the total is 100%. If the light quantity from the central lighting module is 37% and the light quantity from the right lighting module is 63%, the total is 100%. Furthermore, if the light quantity from the central lighting module is 24% and the light quantity from the right lighting module is 76%, the total is 100%. Therefore, illuminance unevenness is less likely to occur on the first target surface R1.

When a second target surface R2 is assumed to be between the lighting module 50 and the first target surface R1, it is preferable that the sum of the light quantities per unit area of the overlapping portions of the second target surface R2 is within ±50%, preferably within 40%, of the light quantity per unit area of the non-overlapping portions. This makes it possible to reduce uneven illuminance even on the second target surface R2.

When a third target surface R3 is assumed between the first target surface R1 and the second target surface R2, it is preferable that the sum of the light quantity per unit area of the overlapping parts of the third target surface R3 is within ±50%, preferably within 40%, of the light quantity per unit area of the non-overlapping parts. This makes it possible to reduce uneven illuminance even on the third target surface R3. By finely setting the light quantity of the light emitting device in this way, it is possible to reduce uneven illuminance not only on the first target surface R1 but also on the second target surface R2 and the third target surface R3, and to perform uniform irradiation. In other words, the difference in light quantity between lightness and darkness is suppressed to within 40%, so that extremely dark parts can be eliminated. In addition, uneven illuminance can be reduced as the second target surface R2 approaches the first target surface R1.

It is preferable that the illumination device has a uniformity ratio expressed by formula (1) of 80% or more at the first target surface R1.
Uniformity (%) = ((minimum illuminance/maximum illuminance) x 100) Formula (1)

Here, "uniformity" is an index of the uniformity of illuminance distribution. The greater the uniformity, the more uniform the brightness.

Here, the uniformity at the first target surface R1 is 100%. However, because this is a simulation result, the actual uniformity is likely to be at least 90%, and preferably 95% or more.

The lighting device has a uniformity ratio expressed by formula (1) that is higher than 60% on the second target surface R2 and the third target surface R3.

In addition, the difference in brightness between adjacent illuminated areas on the second target surface R2 and the third target surface R3 is reduced, thereby reducing uneven illuminance. In other words, on the second target surface R2, if the illumination width is within ±1200 mm, the difference in the amount of light between brightness and darkness is within 20%. On the third target surface R3, if the illumination width is between ±300 mm and ±1500 mm, except for within ±300 mm near the center, the difference in the amount of light between brightness and darkness is within 20%.

Therefore, by adjusting the width of illumination from the lighting module and the degree of overlap of light taking into account the height of the object to be illuminated, it is possible to reduce unevenness in the illumination on the object to be illuminated.

Third embodiment The illumination device according to the third embodiment will be described with reference to the drawings. FIG. 18 is a schematic diagram showing a state in which light is irradiated from the illumination device according to the third embodiment to the first target surface. FIG. 19 is a partially enlarged view of FIG. 18 showing the state of light near the exit when light is irradiated from the illumination device according to the third embodiment to the first target surface. FIG. 20 is a diagram showing the cross-sectional intensity of irradiation on the first target surface when light is irradiated from the illumination device according to the third embodiment to the first target surface. FIG. 21 is a diagram showing the cross-sectional intensity of irradiation on a virtual second target surface when light is irradiated from the illumination device according to the third embodiment to the first target surface. FIG. 22 is a diagram showing the cross-sectional intensity of irradiation on a virtual third target surface when light is irradiated from the illumination device according to the third embodiment to the first target surface. However, the cross-sectional intensities in FIGS. 20 to 22 are the results of a simulation. In FIGS. 20 to 22, the horizontal axis indicates the irradiation width (mm), and the vertical axis indicates the light intensity ratio (a.u.). For comparison between Figures 16 and 17, the light intensity ratios in Figures 21 and 22 are values relative to the light intensity ratios in Figures 16 and 17. The camera 60, lens 65, sensor 70, and control device 30 can be the same as those in the lighting device according to the first embodiment. Even if the lighting module is changed from two to three, the roles of the camera, sensor, and control device are the same.

Based on the first target surface, the lighting module is at a height of 4.5 m, the second target surface is at a height of 1.5 m, and the third target surface is at a height of 1 m. The second and third target surfaces can be changed as desired depending on the height and movement of the target object.

The lighting device 100 according to the third embodiment includes a camera 60 with a lens 65, a sensor 70 that detects light incident from the lens 65 of the camera 60, converts the light into an electrical signal using a mounted light quantity sensor, and transmits the data in order to detect the individual spatial positions of a plurality of measurement points defined on the object, a plurality of lighting modules 50 in which a plurality of light-emitting devices are arranged in a matrix or staggered pattern, and a control device that adjusts the light quantity of each of the plurality of light-emitting devices so that when light is irradiated onto a first target surface R1 that is a predetermined distance away from the plurality of lighting modules 50 according to data from the sensor 70, the sum of the light quantities per unit area of the overlapping portions of the light on the first target surface R1 is within ±40%, preferably within ±30%, of the light quantity per unit area of the non-overlapping portions. When a second target surface R2 is assumed between the lighting module 50 and the first target surface R1, the sum of the light quantities per unit area of the overlapping portions of the light on the second target surface R2 is within ±30% of the light quantity per unit area of the non-overlapping portions. This makes it possible to provide a highly efficient lighting device that can reduce uneven illuminance.

The lighting device 100 according to the third embodiment will be described with three lighting modules 50 to simplify the explanation. Unlike the lighting device according to the second embodiment, the lighting device according to the third embodiment has a lower light amount of a part of the lighting modules at both ends that irradiate the non-overlapping part of the light. In other words, the illuminance unevenness on the first target surface R1 can be suppressed low while reducing the illuminance unevenness on the second target surface R2. For example, if the light amount from the central lighting module in the overlapping part of the light on the first target surface R1 is 100%, the light amount of the non-overlapping part of the lighting modules at both ends is about 70%. The light amount near the center of the central lighting module is 65%, and the light amount decreases to 63%, 50%, 37%, 24%, and 11% as it moves toward the periphery. In addition, the light amount increases from the periphery to the center of the overlapping part of the light in the lighting modules at both ends, and the light amount is 11%, 24%, 37%, 50%, 63%, and 76%, and the light amount in the non-overlapping part is 70%. However, the sum of the light quantity per unit area of the overlapping portion of the light on the first target surface R1, which is a predetermined distance away from the three lighting modules, is within ±40%, preferably about ±30%, of the light quantity per unit area of the non-overlapping portion. That is, on the first target surface R1, if the light quantity from the central lighting module is 65%, the light quantity from the right lighting module is 11%, and the light quantity from the left lighting module is 24%, the total is 100%. Similarly, if the light quantity from the central lighting module is 63% and the light quantity from the right lighting module is 37%, the total is 100%. If the light quantity from the central lighting module is 37% and the light quantity from the right lighting module is 63%, the total is 100%. Furthermore, if the light quantity from the central lighting module is 24% and the light quantity from the right lighting module is 76%, the total is 100%. On the other hand, the light quantity from the right lighting module in the non-overlapping portion is 70%. Therefore, on the first target surface R1, the difference in light quantity is within ±30%, making it difficult for uneven illuminance to occur.

When a second target surface R2 is assumed to be between the lighting module 50 and the first target surface R1, it is preferable that the sum of the light quantities per unit area of the overlapping portions of the second target surface R2 is within ±30%, and preferably within 20%, of the light quantity per unit area of the non-overlapping portions of the light. This makes it possible to reduce uneven illuminance even on the second target surface R2.

When a third target surface R3 is assumed between the first target surface R1 and the second target surface R2, it is preferable that the sum of the light quantity per unit area of the overlapping portion of the light on the third target surface R3 is within ±30%, preferably within 25%, of the light quantity per unit area of the non-overlapping portion. This makes it possible to reduce illuminance unevenness on the third target surface R3 as well. By finely setting the light quantity of the light-emitting device in this way, it is possible to reduce illuminance unevenness not only on the first target surface R1 but also on the second target surface R2 and the third target surface R3, and uniform irradiation can be performed. In other words, by reducing the illuminance unevenness on the second target surface R2, it is possible to reduce the illuminance unevenness on the third target surface R3. In addition, the difference in the light quantity between the brightness and darkness on the third target surface R3 is suppressed to within 30%, so that extremely dark areas can be eliminated. In addition, it is possible to reduce illuminance unevenness as it approaches the second target surface R2 from the third target surface R3.

In the lighting device 100 according to the third embodiment, it is preferable that the uniformity ratio represented by the above formula (1) is 60% or more on the first target surface R1, and the uniformity ratio represented by the above formula (1) is 80% or more on the second target surface R2.

Here, the uniformity at the first target surface R1 is approximately 70%. The uniformity at the second target surface R2 is approximately 80%. However, because these are simulation results, the actual uniformity is likely to vary to some extent.

When a third object surface R3 is assumed to be between the first object surface R1 and the second object surface R2, it is preferable that the uniformity ratio expressed by the above formula (1) is 70% or more on the third object surface R3. This makes it possible to reduce illuminance unevenness on the third object surface R3 as well.

When a fourth target surface R4 is assumed to be between the lighting module 50 and the second target surface R2, it is preferable that the uniformity expressed by the above formula (1) is 80% or more on the fourth target surface R4. This makes it possible to reduce illuminance unevenness on the fourth target surface R4 as well.

The lighting device has a uniformity ratio expressed by formula (1) that is higher than 60% on the second target surface R2, the third target surface R3, and the fourth target surface R4.

In addition, the difference in brightness between adjacent illuminated areas on the second target surface R2, the third target surface R3, and the fourth target surface R4 is reduced, thereby reducing uneven illuminance. In other words, on the second target surface R2, if the illumination width is within ±2500 mm, the difference in the amount of light between brightness and darkness is within 20%. Also, on the third target surface R3, if the illumination width is within ±2500 mm, the difference in the amount of light between brightness and darkness is within 25%.

Therefore, by adjusting the width of illumination from the lighting module and the degree of overlap of light taking into account the height of the object to be illuminated, it is possible to reduce unevenness in the illumination on the object to be illuminated.

In the lighting devices of the first to third embodiments, the lighting modules 50 are preferably arranged in a matrix or a staggered pattern. FIG. 23 is a schematic diagram of a lighting device in which the lighting modules are arranged in a matrix. For convenience of explanation, the overlapping of light has been described on a plane perpendicular to the floor surface, which is the first target surface, but similar overlapping of light also occurs on a plane parallel to the floor surface. The lighting device can freely select the irradiation location by simply turning on and off the control device 30 according to data from the sensor, and can irradiate the first target surface, etc. without uneven illuminance according to the height of the target object. In addition, the camera 60 and the sensor 70 are arranged between the individual lighting modules 50, but the camera 60 and the sensor 70 can also be arranged integrally with each lighting module 50. This is because using multiple cameras 60 makes it possible to detect the spatial position of the target object more accurately and determine a more appropriate irradiation position. In addition, by switching the lighting module on and off when the target object, such as a person or animal, moves, the person or animal can be tracked.

It is preferable that the illumination angle of one lighting module is between 30 degrees and 60 degrees. This allows for a narrower orientation.

The range of illumination from the lighting module may be varied depending on the multiple measurement points defined on the object. For example, the illumination angle from the lighting module may differ between the center of the stage and the left and right sides of the stage, resulting in a narrower or wider illumination range. For example, when a person who is the object of illumination moves from the center of the stage to the right and left sides of the stage (moving in the x-axis direction), the illumination angle from the lighting module that illuminates the object of illumination differs between the center of the stage and the left and right sides of the stage, making it difficult to illuminate the object in the same way. In such a case, by narrowing the illumination range from the lighting module in the center of the stage and widening the illumination range from the lighting module at the left and right sides of the stage, the object of illumination from the lighting module can be illuminated in the same way.

Even if the spatial position of the object is detected as a single point, the appropriate irradiation position can be ensured by setting the irradiation range to a specified range. For example, when detecting the position of the nose of a person as the object, the irradiation position can be set to a range that includes the face and shoulders, allowing appropriate irradiation even if the spatial position changes.

Furthermore, infrared or ultraviolet light emitters 80 may be provided at multiple measurement points defined on the object. In this case, it is preferable to use an infrared sensor camera or an ultraviolet sensor camera as the camera 60.

Each component will be described in detail below.
Lighting Module

For example, the lighting module has multiple light-emitting devices arranged in a matrix or staggered pattern on a substrate. It is preferable to use multiple lighting modules, with two, three, or four of them forming one group, and to prepare multiple groups. As an example, a high luminous flux can be obtained by illuminating the same area with multiple lighting modules formed into one group, thereby increasing the overall amount of light. When the brightness of one lighting module is insufficient, the brightness can be further increased by using an assembly using multiple lighting modules. As another example, one lighting module can illuminate an area of 3m x 3m, and an assembly of four lighting modules can illuminate an area of 6m x 6m. By narrowing the illumination range of one lighting module, the illumination conditions can be set in detail. On the other hand, by widening the illumination range of one lighting module, the number of parts, such as the number of light-emitting devices, can be reduced, and an inexpensive lighting module can be produced.

Light-emitting device The light-emitting device may be only a light-emitting element, but a combination of a semiconductor light-emitting element and a wavelength conversion member is preferable. A combination of a light-emitting element and a wavelength conversion member can emit various light colors such as white, warm white, and multiple colors. The light-emitting device may be configured so that light from the light-emitting element enters the wavelength conversion member directly or indirectly, and the light-emitting element and the wavelength conversion member may be directly bonded, bonded via an adhesive, or disposed separately. For example, a light-emitting device having a lead and a recess in a package having a recess, and a wavelength conversion member disposed in the recess so as to cover the light-emitting element, may be used. Also, a light-emitting device may be used in which one or more light-emitting elements are disposed on one or more substrates, one or more plate-shaped wavelength conversion members are bonded to the light-emitting element with an adhesive, and the light-emitting element and/or the wavelength conversion member are covered with a reflective member. Also, a light-emitting device may be used in which a light-emitting element is disposed on a substrate, a plate-shaped light-transmitting member such as glass or ceramics coated with a wavelength conversion member is bonded to the light-emitting element with an adhesive, and the light-emitting element and the wavelength conversion member are covered with a reflective member. These light emitting devices are arranged in a matrix or staggered pattern, and rod lenses can be arranged so that light from the light emitting devices is emitted in a desired direction. Although it is preferable to provide one rod lens for one light emitting device, it is also possible to provide multiple rod lenses for one light emitting device, or to provide one rod lens for multiple light emitting devices.

Package The package may include a light-emitting element, a first covering member, a first light-transmitting member, and a second light-transmitting member. The light-emitting element includes a pair of electrodes on a first surface. The first covering member may be insulating in order to cover the side surface of the light-emitting element. The first covering member is preferably reflective, but may be light-transmitting. The reflective first covering member may be, for example, a silicone resin containing about 60 wt% silica and white titanium oxide, and may be formed by compression molding, transfer molding, injection molding, printing, spraying, or the like. The first covering member may be formed into a plate shape and cut to a predetermined size to form a rectangular parallelepiped.

A liquid second light-transmissive member is applied onto the first light-transmissive member of the plate-like member, and a plurality of light-emitting elements are bonded to each of them. The liquid second light-transmissive members are formed so as to be separated from each other. Each second light-transmissive member can be formed into any shape in a plan view corresponding to the shape of the light-emitting element, for example, a square, a rectangle, a circle, or an ellipse. The interval between adjacent second light-transmissive members can be appropriately set according to the outer shape of the package and the number of packages to be taken. In addition, it is preferable that the second light-transmissive member is formed so as to cover 70% or more of the area of the first light-transmissive member of the plate-like member. The first light-transmissive member itself may be the wavelength conversion member, or the wavelength conversion member may be contained in the resin or ceramic, or the wavelength conversion member may be contained in the second light-transmissive member.

In the above, the light-emitting element and the first translucent member are joined via the second translucent member that exists between them, but they can also be joined directly without using the second translucent member. In other words, after the light-emitting element is placed on the first translucent member, the first translucent member in liquid form can be poured around the light-emitting element.

Note that the term "plate-like" refers to a member with a large area on which one or more light-emitting elements can be mounted, and may be expressed in other terms such as sheet-like, film-like, or layer-like.

Light-emitting element As the light-emitting element, for example, a semiconductor light-emitting element such as a light-emitting diode can be used, and a light-emitting element capable of emitting visible light such as blue, green, red, etc. can be used. The semiconductor light-emitting element includes a laminated structure including a light-emitting layer, and an electrode. The laminated structure includes a first surface on the side where the electrode is formed, and a second surface on the opposite side, which serves as a light extraction surface.

The laminated structure includes a semiconductor layer including a light-emitting layer. It may further include a light-transmitting substrate such as sapphire. An example of the semiconductor laminate may include three semiconductor layers: a first conductive type semiconductor layer (e.g., an n-type semiconductor layer), a light-emitting layer (active layer), and a second conductive type semiconductor layer (e.g., a p-type semiconductor layer). The semiconductor layer capable of emitting ultraviolet light or visible light from blue light to green light may be formed from a semiconductor material such as a III-V group compound semiconductor. Specifically, a nitride-based semiconductor material such as In _x Al _y Ga _1-X-Y N (0≦X, 0≦Y, X+Y≦1) may be used. The semiconductor laminate capable of emitting red light may be made of GaAs, GaAlAs, GaP, InGaAs, InGaAsP, or the like. The electrode is preferably made of copper.

First Covering Member The first covering member is preferably a resin member containing, as a main component, a thermosetting resin such as a silicone resin, a silicone modified resin, an epoxy resin, or a phenol resin.

The first covering member is preferably a light-reflective resin member. Light-reflective resin means a resin material with a reflectance of 70% or more for the light from the light-emitting element. For example, a white resin is preferable. The light that reaches the first covering member is reflected and directed toward the light-emitting surface of the light-emitting device, thereby increasing the light extraction efficiency of the light-emitting device. The first covering member may also be a light-transmitting resin member. In this case, the first covering member may be made of the same material as the first light-transmitting member described below.

As a light-reflective resin, for example, a light-reflective material dispersed in a translucent resin can be used. Suitable light-reflective materials include, for example, titanium oxide, silicon oxide, zirconium oxide, potassium titanate, aluminum oxide, aluminum nitride, boron nitride, and mullite. Light-reflective materials can be in the form of particles, fibers, or thin plates, but fibers are particularly preferred because they are expected to have the effect of reducing the thermal expansion coefficient of the first covering member.

First light-transmitting member The first light-transmitting member is disposed on the second surface of the light-emitting element. The material of the first light-transmitting member may be resin, glass, or the like. As the resin, a thermosetting resin such as a silicone resin, a silicone-modified resin, an epoxy resin, or a phenolic resin, or a thermoplastic resin such as a polycarbonate resin, an acrylic resin, a methylpentene resin, or a polynorbornene resin may be used. In particular, a silicone resin having excellent light resistance and heat resistance is preferable.

The first light-transmissive member may contain a phosphor as a wavelength conversion member in addition to the above-mentioned light-transmissive material. The phosphor used is one that can be excited by light emitted from the light-emitting element. For example, examples of phosphors that can be excited by blue light-emitting elements or ultraviolet light-emitting elements include cerium-activated yttrium aluminum garnet phosphors (YAG:Ce); cerium-activated lutetium aluminum garnet phosphors (LAG:Ce); europium- and/or chromium-activated nitrogen-containing calcium aluminosilicate phosphors (CaO-Al ₂ O ₃ -SiO ₂ :Eu,Cr); europium-activated silicate phosphors ((Sr,Ba) ₂ SiO ₄ :Eu); nitride phosphors such as β-sialon phosphors, CASN phosphors, and SCASN phosphors; KSF phosphors (K ₂ SiF ₆ :Mn); sulfide phosphors, and quantum dot phosphors such as perovskite, lead sulfide, and chalcopyrite. By combining these phosphors with blue light-emitting elements or ultraviolet light-emitting elements, light-emitting devices of various colors (for example, white light-emitting devices) can be manufactured.

In addition, the first translucent member may contain various fillers, etc., for the purpose of adjusting the viscosity, etc.

Substrate The substrate has wiring. The support member of the substrate is preferably made of an insulating material, and is preferably made of a material that is difficult to transmit light emitted from the light emitting element and external light. The substrate may be made of a material that has a certain degree of strength, or a material that is used as a sheet or flexible substrate. Specific examples of the material include ceramics such as alumina, aluminum nitride, and mullite, and resins such as phenol resin, epoxy resin, polyimide resin, bismaleimide triazine resin, and polyphthalamide resin.

Camera The camera 60 includes a lens 65. The camera may use one or more lenses. Combining multiple lenses can facilitate capturing light. The lenses may be biconvex, plano-convex, convex meniscus, concave meniscus, plano-concave, biconcave, or other lenses in various shapes, and may be combined as appropriate. Lenses may be made of glass or transparent plastics such as organic glass.

The camera can be an infrared sensor camera or an ultraviolet sensor camera. Infrared and ultraviolet rays are emitted outdoors even at night, so they can be irradiated onto the target object and the reflected infrared or ultraviolet light can be read by an infrared sensor camera or an ultraviolet sensor camera. People and animals also emit weak infrared rays, so by detecting this infrared light, it is possible to determine the spatial position of people and animals. For example, by capturing infrared rays with 8 x 8 pixels, it is possible to detect the temperature distribution of an area and detect the movement or presence of the target object. The spatial position of the target object can be detected by detecting the temperature of the target object, the surface temperature including clothing, and the ambient temperature such as the wall temperature using an infrared array sensor.

By providing infrared or ultraviolet light emitters at multiple measurement points defined on the object, the infrared or ultraviolet light can be received by an infrared or ultraviolet sensor camera to determine the spatial position of the object. Indoors, if the lighting device does not contain infrared or ultraviolet light, the position of the object cannot be determined when it is completely turned off. On the other hand, if a light emitter that emits visible light is used at the spatial position of the object, it is difficult to achieve darkness. In contrast, by providing infrared or ultraviolet light emitters at multiple measurement points defined on the object and using an infrared or ultraviolet sensor camera that can receive infrared or ultraviolet light, the spatial position of the object can be easily determined while achieving darkness, and an appropriate irradiation position can be determined.

Furthermore, Lidar (Light detection and ranging, Laser Imaging Detection and Ranging, hereinafter referred to as Lidar) can be used as a combination of a camera and a sensor. Lidar is a remote sensing technology that uses light, and measures scattered light in response to a pulsed laser irradiation to analyze the height and size of an object. This laser uses near-ultraviolet light or infrared light that is invisible to the naked eye, so that the height of the object can be analyzed without irradiating the object with colored light. In addition, by using infrared light and a low-power laser (on the order of 1 W), it is possible to protect the eyes and avoid blindness. In this way, the lighting device may further include an ultraviolet laser or an infrared laser in addition to a camera, a sensor, a lighting module, and a control device. The ultraviolet light or infrared light emitted by this ultraviolet laser or infrared laser can be detected by a camera and a sensor, and the individual spatial positions of multiple measurement points defined on the object can be detected.

Sensors As sensors, CMOS (Complementary Metal Oxide Semiconductor) image sensors, CCD (Charge Coupled Device) image sensors, MEMS (Micro Electro Mechanical Systems) and the like can be used. CMOS image sensors are solid-state imaging elements using CMOS, and use photodiodes (PDs) like CCD image sensors, but the manufacturing process and signal readout method are different. MEMS refers to devices in which mechanical components, sensors, actuators, and electronic circuits are integrated on a single silicon substrate, glass substrate, or substrate made of organic material by microfabrication technology. CCD image sensors are also one type of solid-state imaging element, and are semiconductor elements that are widely used in video cameras, digital cameras, photodetectors, and the like. It is preferable to place the sensor inside the camera, but it can also be placed separately from the camera via a mirror, fiber, or the like. Placing the sensor inside the camera can reduce the risk of malfunction caused by light from the lighting module.

Control device A micro control unit (hereinafter referred to as MCU) is built in as the control device. The MCU is an embedded microprocessor that integrates a computer system into a single integrated circuit. The control device may be an MCU placed on the board on which the light-emitting devices are placed, but it is preferable to place the MCU separately from the lighting module. By adjusting the brightness of multiple light-emitting devices from on to off in accordance with the movements and standing positions of performers on stage and the position of the object to be illuminated, a lighting device with little unevenness in illuminance as described above can be realized.

Rod lenses Rod lenses have the role of emitting light from a light-emitting device to the outside. Rod lenses can narrow the orientation and make the light uniform within the emission surface.

A rod lens emits a uniform light beam from the exit end face with reduced unevenness in illuminance and color after it is incident on the entrance end face. A rod lens is formed in a cylindrical shape such as a polygonal column such as a square column or a hexagonal column, an elliptical column, or a cylinder, and has a uniform refractive index inside. The entrance end face and the exit end face are formed in a polygonal shape such as a square or a hexagon, an elliptical shape, a circular shape, or the like, and are formed parallel to each other with the same area or with the exit face being larger than the entrance face. Examples of materials for forming a rod lens include glass and transparent resin. A hollow rod lens can also be used.

A rod lens is a device in which light rays emitted from a light emitting device enter the input end face, are totally reflected by the inner surface of the rod lens, and enter the output end face. At the output end face, the light rays that enter the output end face from the input end face without being totally reflected overlap, thereby making the illuminance and color unevenness of the light uniform at the output end face.

The rod lens is shaped so that the light emitted from its exit end surface evens out unevenness in illuminance and color, and is positioned in a specified position so that the light emitted from the exit end surface of the rod lens illuminates the lens without exception.

Lens One or more lenses may be used. The irradiation range can be controlled by combining multiple lenses. Lenses of biconvex, plano-convex, convex meniscus, concave meniscus, plano-concave, biconcave, etc. can be appropriately combined. Lenses can be made of glass or transparent plastics such as organic glass.

The infrared ray emitter and the ultraviolet ray emitter are preferably light emitting diodes (LEDs) and laser diodes (LDs).
The infrared emitting body can have a wavelength longer than 780 nm, but it is preferable to use an infrared emitting body having a wavelength of 780 nm to 1400 nm, and more preferably to use an infrared emitting body having a wavelength of 780 nm to 1200 nm. By using this wavelength range, it is not visible. On the other hand, even if light having a wavelength longer than 780 nm enters the eye, damage to the eye is suppressed.

Ultraviolet light emitters with wavelengths shorter than 380 nm can be used, but it is preferable to use UV-A wavelengths of 315 nm to 380 nm, and more preferably to use wavelengths of 360 nm to 380 nm. Using this wavelength range makes it impossible to see. On the other hand, even if light of 360 nm to 380 nm enters the eye, damage to the eye is limited if the light is relatively weak.

In addition to a method like Lidar, which combines a camera, sensor, and laser to detect the height, size, and position of an object by irradiating the object with a laser, it is also possible to provide the object itself with an infrared or ultraviolet light emitter. This makes it possible to detect the object's more appropriate spatial position.

The lighting device according to the embodiment will be described using an example of a lighting device using three lighting modules. Fig. 24 is a schematic diagram showing the projection conditions of the lighting devices of the embodiment and the comparative example. Fig. 25 is a photograph showing the irradiation state in the first embodiment. Fig. 26 is a diagram showing the cross-sectional intensity of irradiation in the first embodiment. Fig. 27 is a photograph showing the irradiation state in the first comparative example. Fig. 28 is a diagram showing the cross-sectional intensity of irradiation in the first comparative example. Since this is to confirm the irradiation state, a camera and a sensor are not used here.

The lighting device 100 according to the first embodiment uses three lighting modules 50. The lighting device includes three lighting modules 50 in which a plurality of light-emitting devices are arranged in a matrix or staggered pattern, and a control device that adjusts the light intensity of each of the three light-emitting devices so that when light is irradiated from the three lighting modules to a first target surface that is a predetermined distance away, the sum of the light intensity per unit area of the overlapping portions of the light on the first target surface is within ±20% of the light intensity per unit area of the non-overlapping portions of the light.

The distance from the lighting module 50 to the first target surface is approximately 4500 mm, and the spacing between adjacent lighting modules 50 is approximately 1455 mm. The first target surface illuminated from one lighting module 50 is approximately a square with a side length of approximately 3491 mm. The illumination angle of one lighting module 50 is approximately 42.4°. Illuminating three lighting modules 50 results in a rectangle of approximately 6400 mm x 3491 mm.

On the first target surface, the average brightness is about 490 cd/ ^m2 . The difference in the amount of light on the part of the first target surface where light is irradiated is kept within ±20%. Therefore, even if the movement or standing position of the performers on the first target surface shifts, the same brightness can be maintained without switching the light amount of the lighting module.

In contrast, the lighting device according to Comparative Example 1 illuminates the entire irradiation surface of one lighting module with the same amount of light. Therefore, when the light from three lighting modules is overlapped, the amount of light from the overlapping parts of the three lighting modules in the center is the highest, the amount of light from the overlapping parts of the light from two lighting modules is next lowest, and the amount of light from the parts in the peripheral parts where the light from one lighting module does not overlap is the lowest, resulting in a cross-sectional intensity of an approximately triangular shape with steps. In this case, the light is brightest when the performer stands in the center, but if the performer is shifted slightly to the left or right by even 500 mm, the light becomes 20 to 30% darker, and if the performer is shifted further to the left or right, the light becomes 50 to 70% darker. In this way, if the light becomes darker or brighter just by moving a little, the audience will feel uncomfortable with the lighting. Also, if multiple lighting modules are repeatedly turned on and off so that the light does not become darker or brighter just by moving a little, the light moves faster and the audience will feel uncomfortable with the lighting.

The lighting device according to this embodiment can be used in television studios and theater stages, particularly as suspension lights.

REFERENCE SIGNS LIST 10 Light emitting device 10a First light emitting device 10b Second light emitting device 10c Third light emitting device 10d Fourth light emitting device 20 Substrate 25 Rod lens 30 Control device 50 Illumination module 51 First illumination module 52 Second illumination module 53 Third illumination module 54 Fourth illumination module 55 Fifth illumination module 60 Camera 65 Lens 70 Sensor 80 Infrared light emitter or ultraviolet light emitter 90 Infrared laser or ultraviolet laser 100 Illumination device R1 First target surface R2 Second target surface R3 Third target surface R4 Fourth target surface A Part where lights do not overlap B, B1, B2, B3 Overlapping parts of lights C Part where lights do not overlap e1 First distance e2 Second distance e3 Third distance e4 Fourth distance

Claims (19)

A camera with a lens,
A sensor that detects light incident from the lens of the camera in order to detect the individual spatial positions of a plurality of measurement points defined on the object, converts the light into an electrical signal using a light quantity sensor mounted thereon, and transmits the data;
A plurality of lighting modules each having a plurality of light emitting devices arranged in a matrix or a staggered pattern;
a control device that adjusts the light intensities of the plurality of light-emitting devices so that, when light is irradiated onto a first target surface that is a predetermined distance away from the plurality of lighting modules in accordance with the data from the sensor, a sum of light intensities per unit area of overlapping portions of the light on the first target surface is within ±20% of the light intensities per unit area of non-overlapping portions of the light,
The lighting module includes a first lighting module having at least a first light emitting device and a second light emitting device, and a second lighting module having at least a third light emitting device and a fourth light emitting device;
when light is irradiated from the first lighting module to the first target surface that is a predetermined distance away, in a light overlapping portion on the first target surface, when a first distance from the first light emitting device to the first target surface irradiated by the first light emitting device is longer than a second distance from the second light emitting device to the first target surface irradiated by the second light emitting device, an amount of light of the first light emitting device is lower than an amount of light of the second light emitting device,
the second lighting module is adjacent to the first lighting module on a side of the first light emitting device,
A lighting device in which, when light is irradiated from the second lighting module to the first target surface away from the third target surface, in an overlapping portion of light on the first target surface, when a third distance from the third light-emitting device to the first target surface irradiated by the third light-emitting device is longer than a fourth distance from the fourth light-emitting device to the first target surface irradiated by the fourth light-emitting device, the light amount of the third light-emitting device is lower than the light amount of the fourth light-emitting device. A camera with a lens,
A sensor that detects light incident from the lens of the camera in order to detect the individual spatial positions of a plurality of measurement points defined on the object, converts the light into an electrical signal using a light quantity sensor mounted thereon, and transmits the data;
A plurality of lighting modules each having a plurality of light emitting devices arranged in a matrix or a staggered pattern;
a control device that adjusts the light intensities of the plurality of light-emitting devices so that, when light is irradiated onto a first target surface that is a predetermined distance away from the plurality of lighting modules in accordance with the data from the sensor, a sum of light intensities per unit area of overlapping portions of the light on the first target surface is within ±20% of the light intensities per unit area of non-overlapping portions of the light,
The lighting modules include at least a third lighting module, a fourth lighting module, and a fifth lighting module;
The third lighting module and the fifth lighting module are arranged in line symmetry with respect to the fourth lighting module,
a sum of light intensities per unit area of overlapping portions of light from the third lighting module, the fourth lighting module, and the fifth lighting module on the first target surface; and
a sum of the amount of light per unit area of an overlapping portion of light from the third lighting module and the fourth lighting module on the first target surface; and
a sum of the light amounts per unit area of the overlapping portions of the light from the fifth lighting module and the fourth lighting module on the first target surface is within ±20%,
an amount of light from the fourth lighting module in an overlapping portion of light from the third lighting module, the fourth lighting module, and the fifth lighting module on the first target surface is
an illumination device that reduces the amount of light from the fourth illumination module in an overlapping portion of the light from the third illumination module and the light from the fourth illumination module on the first target surface; The lighting device according to claim 1 or 2, wherein, when a second target surface is assumed to exist between the lighting module and the first target surface, the sum of the light quantities per unit area of the overlapping portions of the light on the second target surface is within ±50% of the light quantity per unit area of the non-overlapping portions of the light. The illumination device according to claim 1 , wherein the illumination device has a uniformity ratio expressed by formula (1) of 80% or more on the first target surface.
Uniformity (%) = ((minimum illuminance/maximum illuminance) x 100) Formula (1) A camera with a lens,
A sensor that detects light incident from the lens of the camera in order to detect the individual spatial positions of a plurality of measurement points defined on the object, converts the light into an electrical signal using a light quantity sensor mounted thereon, and transmits the data;
A plurality of lighting modules each having a plurality of light emitting devices arranged in a matrix or a staggered pattern;
a control device that adjusts the light intensities of the plurality of light-emitting devices so that, when light is irradiated from the plurality of lighting modules to a first target surface that is a predetermined distance away according to data from the sensor, a sum of light intensities per unit area of overlapping portions of the light on the first target surface is within ±40% of the light intensities per unit area of non-overlapping portions of the light,
When a second target surface is assumed to be between the lighting module and the first target surface, the sum of the light quantities per unit area of the overlapping portions of the light on the second target surface is within ±30% of the light quantity per unit area of the non-overlapping portions of the light,
The lighting modules include at least a third lighting module, a fourth lighting module, and a fifth lighting module;
The third lighting module and the fifth lighting module are arranged in line symmetry with respect to the fourth lighting module,
a sum of light amounts per unit area of overlapping portions of light from the third lighting module, the fourth lighting module, and the fifth lighting module on the first target surface; and
a sum of the amount of light per unit area of an overlapping portion of light from the third lighting module and the fourth lighting module on the first target surface; and
a sum of the light amounts per unit area of the overlapping portions of the light from the fifth lighting module and the fourth lighting module on the first target surface is within ±20%,
an amount of light from the fourth lighting module in an overlapping portion of light from the third lighting module, the fourth lighting module, and the fifth lighting module on the first target surface is
an illumination device that reduces the amount of light from the fourth illumination module in an overlapping portion of the light from the third illumination module and the light from the fourth illumination module on the first target surface; the illumination device has a uniformity ratio expressed by formula (1) of 60% or more on the first target surface,
The illumination device according to claim 5 , wherein the uniformity ratio expressed by the formula (1) on the second target surface is 80% or more.
Uniformity (%) = ((minimum illuminance/maximum illuminance) x 100) Formula (1) When a third object surface is assumed to be between the first object surface and the second object surface,
The illumination device according to claim 6 , wherein the uniformity ratio expressed by the formula (1) on the third object surface is 70% or more. When a fourth target surface is assumed between the lighting module and the second target surface,
The illumination device according to claim 6 or 7, wherein the uniformity ratio expressed by the formula (1) on the fourth object surface is 80% or more. The lighting device according to any one of claims 1 to 8, wherein the illumination angle of one of the lighting modules is 30 degrees or more and 60 degrees or less. The lighting device according to any one of claims 1 to 9, wherein the light emitting device has a semiconductor light emitting element and a wavelength conversion member. The lighting device according to any one of claims 1 to 10, wherein the light emitting device is composed of two or more types of light emitting devices with different color temperatures. The lighting device according to any one of claims 1 to 11, wherein the lighting module includes a rod lens that narrows the light emitted from the light emitting device. The lighting device according to claim 3 or claim 5, or any one of claims 6, 9 to 12 which cite claim 3 or claim 5, wherein the second target surface is 1.5 m above the first target surface. The lighting device according to claim 7, wherein the third target surface is 1 m above the first target surface. The lighting device according to claim 8, wherein the fourth target surface is 1.69 m above the first target surface. The lighting device according to any one of claims 1 to 15, wherein the lighting modules are arranged in a matrix or a staggered pattern. The lighting device according to any one of claims 1 to 16, wherein an infrared emitting body or an ultraviolet emitting body is provided at the plurality of measurement points defined on the object. The lighting device according to any one of claims 1 to 17, wherein the illumination range illuminated by the lighting module varies depending on the plurality of measurement points defined on the object. The illumination device further comprises an ultraviolet laser or an infrared laser;
19. The lighting device according to claim 1, wherein the ultraviolet light or infrared light emitted by the ultraviolet laser or the infrared laser is detected by the camera and the sensor, and the individual spatial positions of a plurality of measurement points defined on the object are detected.

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