WO2014118826A1 - Illumination unit and illumination device - Google Patents

Abstract

Provided are: an illumination device capable of providing a desired size and shape in accordance with a variety of conditions, in an application using a plurality of light sources having different dominant wavelengths; and a configuration unit therefor. The illumination unit includes a plurality of light source types and a substrate that fixes the plurality of light source types. The plurality of light source types generate light having different dominant wavelengths and the substrate has a shape that is expandable by joining with other substrates. One illumination unit includes a plurality of light source types that each generate different dominant wavelengths and the substrate is expandable. Therefore, by joining a plurality of illumination units, an illumination device can be configured that has a desired size and shape in accordance with a variety of conditions such as the light irradiation target and/or the illumination device installation location, etc., in an application using a plurality of light sources having different dominant wavelengths.

Description

Lighting unit and lighting device

The present invention relates to a lighting unit and a lighting device constituted by the lighting unit. In particular, the present invention relates to a lighting device for plant growth.

The use of artificial light sources using LEDs is known as means for artificially controlling the growth environment of plants. The use of such an artificial light source is described in, for example, Japanese Patent Application Laid-Open No. 2012-39996 (Patent Document 1). Specifically, an illumination device is disclosed in which a plurality of three types of LEDs having different emission colors are mounted.

JP 2012-39996 A

In the illumination device described in Patent Literature 1, LEDs are arranged in a light source casing having a rectangular cross section. Since the positions of all LEDs in the lighting device are fixed to one substrate, the overall size of the lighting device is fixed and cannot be changed.
On the other hand, the place where the lighting device is to be installed and the range where light is to be irradiated vary depending on the type, growth time, growth scale, and the like of the plant to be irradiated with light.
However, the illumination device described in Patent Document 1 cannot deal with situations that can vary in various ways, that is, the installation location and the light irradiation range.

The present invention has been developed in view of such problems of the prior art. Accordingly, it is an object of the present invention to provide an illumination device that can take a desired size and shape according to various situations in an application using a plurality of light sources having different main wavelengths, and a constituent unit thereof. .

(1)
An illumination unit according to one aspect includes a plurality of types of light sources and a substrate that fixes the plurality of types of light sources. The plurality of types of light sources emit light having different main wavelengths. The substrate has a shape that can be expanded by coupling with another substrate.

A single lighting unit includes a plurality of types of light sources that emit light having different main wavelengths, and the substrate is expandable. Therefore, by combining a plurality of lighting units, a plurality of light sources having different main wavelengths are used. In use, a lighting device having a desired size and shape can be configured in accordance with various situations such as a light irradiation target and / or a lighting device installation location.

(2)
The shape of the substrate of the lighting unit may be a polygon.
As a result, the shape of the lighting unit can be simplified, and the lighting unit can be easily expanded.

(3)
The shape of the substrate of the lighting unit may be a hexagon.
Accordingly, a high degree of freedom can be obtained with respect to the shape of the lighting device configured by extending the lighting unit.

(4)
Lights having different principal wavelengths emitted from a plurality of types of light sources may be selected from red light, blue light, green light, and infrared light, respectively.
Accordingly, the illumination unit can be applied to an application using at least two types of light selected from red light, blue light, green light, and infrared light.

(5)
The light having different principal wavelengths emitted from a plurality of types of light sources may include at least white light.
This facilitates identification of the light irradiation target color of the lighting unit.

(6)
The brightness of light having different main wavelengths emitted from a plurality of types of light sources may be individually controlled.
This facilitates light irradiation with patterns having various dominant wavelengths and / or brightness.

(7)
The light source may be at least one of a light emitting diode element and an organic electroluminescence element.
Thereby, the energy saving and long life of the lighting unit can be achieved.

(8)
The light sources may be arranged at a pitch at which the average value of the shortest center distance is not less than 0.1 mm and not more than 50 mm.
Here, the shortest center-to-center distance between light sources refers to the center (on the substrate) of one light source and the light source closest to the one light source among other light sources adjacent to the one light source. , The distance occupied by a single light source).
Thereby, it is possible to make uniform the light having a plurality of main wavelengths emitted from the illumination unit.

(9)
The lighting unit may be used for plant growth.
Thereby, a plant can be grown efficiently.

(10)
A lighting device according to another aspect is configured by connecting a plurality of lighting units according to one aspect.

Since one lighting unit includes a plurality of light sources that emit light having different main wavelengths and the substrate is expandable, a lighting device configured by connecting a plurality of lighting units uses light having different main wavelengths. Depending on the application, it can take a desired size and shape according to various situations such as a light irradiation target and / or a lighting device installation location.

(11)
The connection between the lighting units may be at least by daisy chain connection.
Daisy chain connection means that the lighting units are electrically connected in series.
This makes it possible to simplify the electrical path even when the entire lighting device is composed of a large number of lighting units.

(12)
The light source in the illuminating device is preferably arranged so that each light emitted from a plurality of types of light sources is mixed with each other on the irradiation target surface.
Thereby, each light emitted from a plurality of types of light sources is uniformly irradiated to the same irradiation target.

(13)
In the entire lighting device, it is preferable that the light sources are arranged at a pitch at which the ratio of the maximum value of the shortest center distance to the minimum value of the shortest center distance is 1 or more and 1.5 or less.
Here, the shortest center distance between the light sources is a distance connecting the centers of one light source and the light source closest to the one light source among other light sources adjacent to the one light source. It is. In the illumination device, the one light source and the other adjacent light source may both exist in the same illumination unit, or may exist in different illumination units adjacent to each other.
Thereby, it is possible to make uniform the light emitted from a plurality of types of light sources.

(14)
The plurality of lighting units may include a plurality of types of lighting units having different substrate shapes.
As a result, a higher degree of freedom can be obtained with respect to the shape of the lighting device configured by extending the lighting unit.

(15)
A lighting method according to still another aspect includes a plurality of lighting units including a plurality of light sources and a substrate on which the plurality of light sources are fixed, and the substrate has a shape that can be expanded by coupling with another substrate. And controlling so that at least two of the light sources independently emit light having different dominant wavelengths and / or brightness.
Accordingly, a plurality of lights having different main wavelengths and / or brightness can be emitted from one lighting unit. The lighting unit to be controlled may be a lighting unit in a state of constituting a lighting device.

(16)
The at least two light sources that are independently controlled may be monochromatic light sources that emit light having different main wavelengths.
In this case, the brightness of light emitted from each monochromatic light source controlled independently is controlled.

(17)
The at least two light sources that are independently controlled may be multicolor light sources.
In this case, the dominant wavelength or the dominant wavelength and the brightness of the light emitted from each independently controlled multicolor light source is controlled.

(18)
Control may be performed by remote control.
As a result, the lighting unit can be remotely operated.

According to the present invention, in an application using a plurality of light sources having different dominant wavelengths, an illumination device capable of taking a desired size and shape according to various situations and an illumination unit serving as a component thereof are provided. Can do.
Therefore, for example, it is not necessary to prepare separate lighting devices of different sizes and shapes according to differences in conditions such as the types of plants that can be irradiated with light, the growing season and the growing environment, and only the way of combining the lighting units is changed. A lighting device having a size and shape corresponding to each situation can be configured.

It is a typical front view of the illumination unit of 1st Embodiment. It is a typical front view which shows a part of illuminating device which connected multiple illumination units. It is a block diagram which shows an example of the usage condition of an illuminating device. It is a typical front view of the other example of the illumination unit of 1st Embodiment. It is a typical front view of the further another example of the illumination unit of 1st Embodiment. It is a typical front view of the further another example of the illumination unit of 1st Embodiment. It is a typical front view which shows a part of other example of an illuminating device. It is a typical front view which shows a part of further another example of an illuminating device. It is a typical perspective view which shows a part of further another example of an illuminating device. It is a typical partial notch perspective view which shows a part of further another example of an illuminating device.

100, 100a, 100b, 100c, 100e Illumination unit 110, 110a, 110b, 110c, 110e Substrate 120 LED
500, 500c, 500d, 500e, 500f Lighting device

[First Embodiment]
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic front view of a lighting unit 100 according to the first embodiment. The lighting unit 100 includes a substrate 110 and a light emitting diode (hereinafter simply referred to as LED) element 120 mounted on the substrate 110. FIG. 2 is a schematic front view of an illumination device 500 configured by connecting and expanding a plurality of illumination units 100.

The board 110 is a rigid circuit board having a regular hexagonal shape. As for the size of the substrate 110, a regular hexagonal piece is 2.5 cm.
The material of the substrate 110 may include, for example, a material appropriately selected by those skilled in the art from ceramics, synthetic resins, and metals. More specifically, composite materials such as a glass epoxy substrate and a glass composite substrate may be used. Further, it may have been subjected to a surface processing treatment such as application of a thermal barrier paint or a lamination treatment using an insulating layer or the like.

On the one surface of the substrate 110, four types of single-color LEDs, LEDs 121, 122, 123, and 124, are fixed as LEDs 120. As these LEDs, surface mount type LEDs in which LED elements are mounted in a package material provided with electrodes are used. The main wavelengths of light emitted from the LEDs 121, 122, 123, and 124 are different from each other. Specifically, LED 121 is red light (hereinafter abbreviated as red LED 121), LED 122 is blue light (hereinafter abbreviated as blue LED 122), LED 123 is infrared light (hereinafter abbreviated as infrared LED 123), LED 124. Emits white light (hereinafter abbreviated as white LED 124).

A total of six red LEDs 121, blue LEDs 122, and infrared LEDs 123 are fixed, two for each substrate 110. The six LEDs are all arranged at an equal distance from the center of the substrate 110, and are arranged at equal intervals near each vertex of the regular hexagon so that different types of LEDs are adjacent to each other. One white LED 124 per substrate 110 is disposed and fixed in the center of the substrate 110.

It is known that red light, blue light and infrared light are recognized by specific receptors possessed by plants. Specific dominant wavelengths of light recognized by plant receptors and specific growth responses (e.g., biological reactions leading to photomorphogenesis including seed germination, flower bud differentiation, flowering, cotyledon development, chlorophyll synthesis, and internode elongation, and A correlation has been found with photosynthesis. For this reason, the lighting unit 100 is preferably used for plant growth.

Terminals 130 are provided on each side of the substrate 100. Furthermore, the circuit of the substrate 110 electrically connects the terminal 130 and the package electrodes of the red LED 121, blue LED 122, infrared LED 123, and white LED 124. The circuit and the terminal 130 of the substrate 110 are designed such that the red LED 121, the blue LED 122, the infrared LED 123, and the white LED 124 can be controlled independently. On the other hand, LEDs of the same color may be designed to be controllable in conjunction with each other, or may be designed to be independently controllable.
The design that can be controlled independently is made by providing a number of control systems according to the type and / or number of LEDs to be controlled independently so that each control system functions in parallel.

As shown in FIG. 2, the lighting unit 100 is configured such that the substrate 110 is combined with another substrate 110 so that each side is abutted with each other, thereby forming the lighting device 500. When the substrates 110 are coupled to each other, the surface of the substrate 110 is expanded two-dimensionally, and the substrate 110 is spread all over. For this reason, arrangement | positioning of LED120 in the illuminating device 500 whole is preferably disperse | distributed, and uniformization of irradiated light can be aimed at.

In this case, the terminal 130 of the substrate 110 and the terminal 130 of the other substrate 110 are connected. A male coupling portion 111 and a female coupling portion 112 may be formed on each side so that the substrates 110 can be mechanically coupled to each other. Thereby, the illumination unit 100 and the other illumination unit 100 are directly and electrically connected.

All the lighting units 100 in the lighting device 500 are daisy chain connected. Specifically, only two of the terminals 130 provided in one lighting unit 100 contribute to electrical and mechanical coupling. In the side where the other terminal 130 exists, it is only mechanically coupled by the male coupling part 111 and the female coupling part 112.
Further, in one lighting device 500, there may be only one series circuit by daisy chain connection or a plurality of individually controllable series circuits.

FIG. 3 is a block diagram illustrating an example of how the lighting device 500 is used. As shown in FIG. 3, the lighting device 500 is connected to a power source 700 via the control unit 600.
The control unit 600 controls the red LED 121, the blue LED 122, the infrared LED 123, and the white LED 124 independently. On the other hand, LEDs of the same color may be controlled in conjunction with each other or may be controlled independently.

In controlling the light source, the brightness is mainly adjusted. The brightness is controlled by changing the current value or pulse width in 256 gradations (0 to 255). Specifically, for the purpose of adjusting the flowering time, fruiting time, plant morphology, nutritional components, etc., use various light response reactions (growth reactions) of the plant and specify according to the type of plant and the growth stage, etc. It is possible to irradiate light having the main wavelength of alone or in combination.
Moreover, the control part 600 can also control each series circuit independently, when the one illuminating device 500 has a several series circuit.
Control as described above can be performed by direct operation or remote operation of the control unit 600. The remote operation may be performed via a wireless LAN, the Internet, and / or the cloud.

[Other examples]
4 to 10 show other examples of the first embodiment. In other examples, differences from the first embodiment will be mainly described, and descriptions of the same points will be omitted.

FIG. 4 is a schematic front view of an illumination unit 100a that is another example of the illumination unit 100 of the first embodiment. The illumination unit 100a uses a square substrate 110a instead of the regular hexagonal substrate 110. Three types of single-color LEDs, a red LED 121, a blue LED 122, and a white LED 124, are fixed to one surface of the substrate 110a. Among these, a total of four red LEDs 121 and blue LEDs 122 are fixed, two each for one substrate 110a. Each of the four LEDs is arranged at equal intervals in the vicinity of each vertex of the square so that different kinds of LEDs are adjacent to each other. One white LED 124 is arranged and fixed at the center of the square, one for each substrate 110a.

FIG. 5 is a schematic front view of a lighting unit 100b that is another example of the lighting unit 100 according to the first embodiment. The illumination unit 100b uses a deformed rectangular substrate 110b whose outer periphery is composed of four identical point-symmetric curves instead of the regular hexagonal substrate 110. On one surface of the substrate 110b, five types of single-color LEDs, a red LED 121, a blue LED 122, an infrared LED 123, a white LED 124, and a green LED 125, are fixed. Green light, like red light, blue light, and infrared light, is also involved in plant growth reactions. One red LED 121, blue LED 122, infrared LED 123, and green LED 125 are arranged at equal intervals in the vicinity of each vertex of the deformed rectangle, one for each substrate 110b. One white LED 124 is disposed and fixed at the center of the deformed rectangle, one for each substrate 110b.
Further, on the outer periphery of the substrate 110b, a terminal 130b that enables electrical and mechanical connection with the other substrate 110b, and a male coupling portion 111b and a female die that allow mechanical connection with the other substrate 110b. A coupling portion 112b is formed.

FIG. 6 is a schematic front view of an illumination unit 100c that is another example of the illumination unit 100 of the first embodiment. The illumination unit 100 c uses a substrate 110 c having a notch 113 instead of the regular hexagonal substrate 110. The notch 113 is provided at each of the hexagonal apexes of the substrate 110c.
Further, on the outer periphery of the substrate 110c, a male coupling portion 111c and a female coupling portion 112c that allow mechanical connection with another substrate 110c are formed.

FIG. 7 is a schematic front view of a lighting device 500c as another example of the lighting device 500. FIG. The illumination device 500c is configured by connecting a plurality of illumination units 100c. In the lighting device 500c, by combining the plurality of substrates 110c, the expanded surface S is surrounded by the notch 113 formed in the substrate 110c without covering all the expanded surfaces with the substrate 110c. The The formation of the opening S may be preferable from the viewpoint of heat release.

FIG. 8 is a schematic front view of a lighting device 500d which is another example of the lighting device 500. FIG. The illumination device 500d forms a ring shape as a whole by connecting a plurality of illumination units 100 to each other.
Thereby, it is possible to irradiate a wide range with a small number of illumination units. Moreover, as a similar aspect, when a ring-shaped lighting device (or a circular shape in which the inside is laid by the lighting unit 100) is configured using a smaller number of lighting units 100, it is cultivated with a small plant cultivation device. The plant can be irradiated evenly.

FIG. 9 is a schematic perspective view of a lighting device 500e which is another example of the lighting device 500. FIG. In the illumination device 500e, the illumination units 100 and 100e each having substrates 110 and 110e having different shapes are combined and connected. Thereby, the surfaces of the substrates 110 and 110e are three-dimensionally expanded to form at least a part of the polyhedron (hereinafter referred to as a plane structure). At this time, the surface structure is formed such that the LED 120 is fixed to the outer surface of the surface structure. Thereby, in the illuminating device 500e, LED120 fixed to the outer surface of the surface structure has faced many directions outside the surface structure. For this reason, even if it uses what has a strong directivity as LED120, it is possible to irradiate a wide range easily.

FIG. 10 is a schematic partially cutaway perspective view of a lighting device 500f that is another example of the lighting device 500. FIG. In the illumination device 500f, illumination units 100 and 100e each having substrates 110 and 110e having different shapes are combined and connected. Thereby, the surfaces of the substrates 110 and 110e are three-dimensionally expanded to form at least a part of the polyhedron (hereinafter referred to as a plane structure). At this time, the surface structure is formed such that the LED 120 is fixed to the inner surface of the surface structure. Thereby, in the illuminating device 500f, all of LED120 fixed to the internal surface of a surface structure has faced the inside of a surface structure. Therefore, by arranging the irradiation target inside the surface structure, it is possible to surround or cover the irradiation target and perform intensive irradiation. When the surface structure is configured with a size close to the irradiation target, it is possible to perform near-field irradiation evenly.

[Modification]
In the above-described example, a rigid substrate is exemplified as the substrates 110, 110a, 110b, 110c, and 110e. However, the present invention is not limited to this, and the substrate 110, 110a, 110b, 110c, and 110e may be selected from a flexible substrate and a rigid flexible substrate.

Moreover, although the square, regular pentagon, and regular hexagon are given as the shapes of the substrates 110, 110a, and 110e, other polygons, preferably regular polygons, may be used. In addition, the polygon may be any shape that can be expanded by being joined to each other, and may be a convex polygon or a concave polygon.
Furthermore, in the above-described example, the deformed rectangular shape is used as the shape of the substrate 110b, and the deformed regular hexagon is used as the shape of the substrate 110c. However, other deformed polygons may be used. The deformed polygon includes a shape formed by connecting vertices of a polygon with a curved line instead of a straight line, and a polygon in which each cut portion is formed in a part of the polygon.

In the above example, the notch 113 is formed as a recess at the apex of the regular polygon (regular hexagon) of the substrate 110c. However, the position and shape of the notch 113 on the substrate are limited to this. Not. For example, it may be a through hole formed inside the substrate, or a recess formed at an end other than the apex in the shape of the substrate. For example, the concave polygon is an example of a substrate shape having a notch. In the case of using a substrate having a notch, an opening is inevitably formed by combining a plurality of substrates so that the expanded surface is not all covered with the substrate. The formation of such an opening may be preferable from the viewpoint of heat release or the like.

In the above example, the LED 120 is used as the light source. However, the present invention is not limited to this, and may be selected from organic electroluminescence, a high-pressure sodium lamp, a metal halide lamp, and a fluorescent lamp. Each fixing method can be easily selected by those skilled in the art.

In the above example, the surface mount type LED 120 is used as the LED 120, but a bullet type LED or any other shape LED may be used. Moreover, although the aspect which mounts directly on the board | substrate surface was mentioned as a fixing method, the fixing aspect of LED120 may be detachable, for example, using a socket.

In the above-described example, the light emitted from the light source (LED 120) includes red, blue, green, infrared, and white light used for plant growth. In response, it is arbitrarily selected from visible light and invisible light. Furthermore, the combination of each light which the light source with which one illumination unit was equipped emits is also selected arbitrarily.

In the above example, a monochromatic light source is used as the light source, but the light source may be a monochromatic light source or a multicolor light source. A monochromatic light source has one main wavelength of light that can be developed by one light source, whereas a multicolor light source has a plurality of main wavelengths of light that can be developed by one light source. Control of the dominant wavelength emitted by the multicolor light source is appropriately performed by those skilled in the art.

Some or all of the light sources fixed on the substrate may be multicolor light sources. When all of the light sources fixed on the substrate are multicolor light sources, at least two light sources are independently controlled to emit at least main wavelengths different from each other. Specifically, the dominant wavelength of light emitted from each light source to be controlled independently, or the dominant wavelength and brightness are controlled.
Thereby, for example, as shown in FIGS. 1, 4, 5, and 6, light having a plurality of main wavelengths can be generated in one illumination unit.

Further, the number of light sources fixed to the substrate is not limited to the above example. Specifically, it may vary depending on factors such as the surface area of the substrate, but may be, for example, 2 or more and 20 or less, 2 or more and 15 or less, or 2 or more and 10 or less.
The surface area of one substrate is not particularly limited, but is, for example, 150 cm ² or less. The upper limit value included in the range may be 130 cm ² , 100 cm ² , 50 cm ² , 30 cm ² , 15 cm ² , 10 cm ^2, or 5 cm ² . Lower limit contained in the range is not particularly limited, for ^{example, 1cm 2, 5cm 2, 10cm} 2, 15cm 2, 30cm 2, 50cm 2, may be 100 cm ² or 130 cm ^2. A lighting unit with a smaller surface area of the substrate is preferable in that the degree of freedom in configuring the lighting device is increased. For example, the outer periphery and / or inner periphery of a specific planar shape such as a ring shape illustrated in FIG. 8 can be configured to be closer to a smooth curve. Further, the outer surface of the specific three-dimensional shape illustrated in FIG. 9 and the inner surface of the specific three-dimensional shape illustrated in FIG. 10 can be configured to be closer to a smooth curved surface. Furthermore, it becomes easier to configure a planar shape having a complex uneven outer periphery and / or an uneven inner periphery, or a three-dimensional shape having a complex uneven surface.

The arrangement pitch of each light source fixed to the substrate is not particularly limited. Specifically, although it may vary depending on the size of the light source, the average of the shortest center distance between adjacent light sources in the illumination unit or the entire illumination device is, for example, 5 times or less and 3 times or less of the maximum diameter of the light source. It is preferably 2 times or less, 1.5 times or less, or 1.3 times or less. Although the lower limit contained in the said range is not specifically limited, For example, it is the same length as the maximum diameter of a light source.
Here, the shortest center distance between the light sources is a distance connecting the centers of one light source and the light source closest to the one light source among other light sources adjacent to the one light source. It is. In the lighting device, the one light source and the other adjacent light source may both exist in the same lighting unit, or may exist in different lighting units adjacent to each other. The maximum diameter of the light source is the maximum diameter in the direction parallel to the substrate surface.

Alternatively, the average value of the shortest center distance between adjacent light sources in the lighting unit or in the entire lighting device may be 50 mm or less, 30 mm or less, 20 mm or less, 10 mm or less, or 5 mm or less. The lower limit value included in the range is preferably as small as possible, and is not particularly limited, but is, for example, 0.1 mm.

Furthermore, it is preferable that the distribution of the light source is nearly uniform in the entire lighting device. That is, it is preferable that the light sources are arranged so that the light beams having different main wavelengths emitted from the light source of the illumination device are mixed with each other on the surface of the irradiation target. Specifically, it is preferable that the shortest center distance between all the light sources is the same in the entire lighting device. That is, it is most preferable that the standard deviation of the shortest center distance between the light sources in the entire lighting device is 0, and it is more preferable that the standard deviation is close to 0.
For example, in the entire lighting device, the ratio of the maximum value of the shortest center distance to the minimum value of the shortest center distance (maximum value of the shortest center distance / minimum value of the shortest center distance) is 1 to 1.5. Preferably they are 1 or more and 1.3 or less, More preferably, they are 1 or more and 1.2 or less.
This makes it possible to equalize a plurality of light beams having different main wavelengths. By making the light uniform, the growth reproducibility can be improved when plant growth is controlled under the same conditions. This is particularly preferred when systemizing light control in plant growth.

In the above-described example, the daisy chain connection is exemplified as the electrical connection between the lighting units 100, 100c, and 100e in the lighting devices 500, 500c, 500d, 500e, and 500f, but a star-type connection may be used.

In the above example, the surface structures of the lighting devices 500e and 500f are configured by combining the lighting units 100 and 100e having the plurality of shapes of the substrates 110 and 110e. However, the surface structures have the same shape. You may comprise from a lighting unit.

[Effects produced by the embodiment]
The lighting unit 100, 100a, 100b, 100c, 100e according to the present invention provides the following effects.

In the illumination units 100, 100a, 100b, 100c, and 100e of the present invention, one illumination unit 100 includes a plurality of types of LEDs 120 that emit light having different main wavelengths, and the substrates 110, 110a, 110b, and 110c. , 110e can be expanded, and by combining a plurality of lighting units 100, 100a, 100b, 100c, 100e, in a plant growth application, a desired one can be obtained depending on various situations such as plants and / or plant growth places. A lighting device having a size and a shape can be formed.

Further, since the substrates 110, 110a, and 110e are polygonal, the shape of the illumination units 100, 100a, and 100e can be simplified, and the illumination units 100, 100a, and 100e can be easily expanded.

Particularly, since the substrate 100 is a hexagon and the substrate 100c is a deformed regular hexagon, a high degree of freedom can be obtained with respect to the shapes of the illumination devices 500, 500c, and 500d configured by extending the illumination unit 100.

In the lighting units 100, 100a, 100b, 100c, and 100e, the LED 120 emits light selected from red light, blue light, green light, and infrared light, and therefore can be preferably applied to plant growth applications. Further, by using the white LED 124, the color of the growing plant can be easily identified.

In the lighting units 100, 100a, 100b, 100c, and 100e, the brightness of each of the plurality of types of LEDs 120 is individually controlled, so that various patterns of colors can be emitted depending on the type of plant and / or the growth stage. It becomes easy.

In the illumination units 100, 100a, 100b, 100c, and 100e, since the LED 120 is used as the light source, energy saving and long life of the illumination units 100, 100a, 100b, 100c, and 100e can be achieved.

The lighting devices 500, 500c, 500d, 500e, and 500f can simplify the electrical path because the lighting units 100, 100c, and 100e are daisy chain connected to each other.

In the lighting devices 500e and 500f, the substrates 110 and 110e have different shapes, and the degree of freedom of shape is high due to the combination expansion of the lighting units 100 and 100e.

[Correspondence Relationship Between Each Part in Embodiment and Other Examples and Each Component in Claim]
In the present invention, the illumination units 100, 100a, 100b, 100c, and 100e correspond to “illumination units”, the substrates 110, 110a, 110b, 110c, and 110e correspond to “substrates”, and the LEDs 120 correspond to “light sources”. The lighting devices 500, 500c, 500d, 500e, and 500f correspond to “lighting devices”.

The preferred embodiment of the present invention is as described above, but the present invention is not limited thereto. Various other embodiments may be made without departing from the spirit of the invention. Furthermore, in this embodiment, although the effect | action and effect by the structure of this invention are described, these effect | actions and effects are examples and do not limit this invention.

Claims (18)

1. Including a plurality of types of light sources, and a substrate for fixing the plurality of types of light sources,
   The plurality of types of light sources emit light having different main wavelengths,
   The lighting unit, wherein the substrate has a shape that can be expanded by coupling with another substrate.
2. The lighting unit according to claim 1, wherein the shape is a polygon.
3. The lighting unit according to claim 1 or 2, wherein the shape is a hexagon.
4. The illumination unit according to any one of claims 1 to 3, wherein the lights having different principal wavelengths are selected from red light, blue light, green light, and infrared light, respectively.
5. The lighting unit according to any one of claims 1 to 4, wherein the light having the different dominant wavelength includes at least white light.
6. The lighting unit according to any one of claims 1 to 5, wherein brightness of light having different principal wavelengths is individually controlled.
7. The illumination unit according to any one of claims 1 to 6, wherein the light source is at least one of a light-emitting diode element and an organic electroluminescence element.
8. The lighting unit according to any one of claims 1 to 7, wherein the light sources are arranged at a pitch at which an average value of a shortest center distance is 0.1 mm or more and 50 mm or less.
9. The lighting unit according to any one of claims 1 to 8, which is used for plant growth.
10. An illumination device in which a plurality of illumination units according to any one of claims 1 to 9 are connected.
11. The lighting device according to claim 10, wherein the connection is at least by daisy chain connection.
12. The lighting device according to claim 10 or 11, wherein the light sources are arranged so that the light emitted from the plurality of types of light sources are mixed with each other on a surface to be irradiated.
13. The said light source is arrange | positioned with the pitch from which the ratio of the maximum value of the shortest center distance with respect to the minimum value of the shortest center distance becomes 1 or more and 1.5 or less. Lighting device.
14. The lighting device according to any one of claims 10 to 13, wherein the plurality of lighting units include a plurality of types of lighting units having different shapes of the substrate.
15. An illumination unit including a plurality of light sources and a substrate for fixing the plurality of light sources, the substrate having a shape that can be expanded by coupling with another substrate, and at least two of the plurality of light sources. A lighting method including controlling the light sources to independently emit light having different dominant wavelengths and / or brightnesses.
16. The illumination method according to claim 15, wherein the at least two light sources are monochromatic light sources that emit light having different main wavelengths.
17. The illumination method according to claim 15, wherein the at least two light sources are multicolor light sources.
18. The lighting method according to any one of claims 15 to 17, wherein the control is performed by remote operation.

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