JP2020126786A - Led illumination device for animal and plant cultivation, led illumination module for animal and plant cultivation, shelf plate for cultivation shelf for animal and plant, cultivation shelf for animal and plant, and animal and plant cultivation factory - Google Patents

Abstract

To provide an LED illumination device for animal and plant cultivation, an LED illumination module for animal and plant cultivation, a shelf plate for a cultivation shelf for animals and plants, a cultivation shelf for animals and plants, and an animal and plant cultivation factory.SOLUTION: In an LED illumination module 10 for animal and plant cultivation, an LED illumination sheet 20 includes a plurality of LED chips 21 arranged thereon. The light source color of each LED chip 21 is a light bulb color or warm white color among light source colors specified in JIS Z 9112. Since the light source color of each LED 21 is a light bulb color or warm white color, cultivation of plants is speeded up, so that an amount of plant cultivation can be increased and cultivation days can be reduced. A controller 40 for supplying power to the LED illumination sheet 20 and controlling light emission and the like of the LED illumination sheet 20 is capable of adjusting the illuminance of the LED illumination sheet 20 depending on the growth stage of plants by appropriately adjusting the illuminance of the LED chips 21, thereby capable of adjusting the degree of plant growth.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to an LED lighting device for growing animals and plants, an LED lighting module for growing animals and plants, a shelf board for growing shelves of animals and plants, a growing shelf for animals and plants, and an animal and plant growing factory.

As a lighting device used in an animal and plant growing factory, in recent years, there is an increasing demand for a lighting device using an LED with low power consumption as a light source in place of a conventional fluorescent lamp, a high-pressure sodium lamp, or the like.

As an example of an animal and plant growing plant using a lighting device having an LED as a light source, a plant growing device is known in which a plurality of straight tube type plant growing lights having LEDs as a light source are arranged on a shelf plate of a plant growing shelf. (For example, refer to Patent Document 1).

There is also proposed an LED lighting device for growing animals and plants, in which a plurality of LED chips are arranged on a flexible type circuit board to form a planar light source (for example, see Patent Document 2).

JP 2008-118957 A JP, 2013-251230, A

The present disclosure is capable of obtaining animals and plants in good yield, LED lighting device for animal and plant growth, LED lighting module for animal and plant growth, shelf plate for animal and plant growth shelf, animal and plant growth shelf, and animal and plant growth factory. I will provide a.

The LED lighting device for growing animals and plants according to the present embodiment is an LED lighting device for growing animals and plants, in which a plurality of LED chips are arranged, and the light source color of the LED chips is a light source defined in JIS Z 9112. Among the colors, light bulb color or warm white.

In the LED lighting device for growing animals and plants according to the present embodiment, the light source color of the LED chip may be the light bulb color.

The LED lighting device for growing animals and plants according to the present embodiment is an LED lighting device for growing animals and plants in which a plurality of LED chips are arranged, and the emission spectrum of light from the LED chips has a central wavelength of 610 nm or more. A first peak having a wavelength of 630 nm or less, a second peak having a center wavelength of 440 nm or more and 460 nm or less, and a third peak having a center wavelength of 510 nm or more and 530 nm or less, and relative to each other in the first peak. The emission intensity is greater than the relative emission intensity at the second peak, and the relative emission intensity at the third peak is less than the relative emission intensity at the second peak.

The LED lighting device for growing animals and plants according to the present embodiment is an LED lighting device for growing animals and plants in which a plurality of LED chips are arranged, and the light from the LED chips has a central wavelength of 610 nm or more and 630 nm or less. There is a first component having a half width of 90 nm or more and 110 nm or less, a second component having a center wavelength of 440 nm or more and 460 nm and a half width of 10 nm or more and 20 nm or less, and a center wavelength of 510 nm or more and 530 nm or less. And a third component having a half width of 50 nm or more and 60 nm or less, and the relative emission intensity at the central wavelength of the first component is larger than the relative emission intensity at the central wavelength of the second component, The relative emission intensity at the center wavelength of the third component is smaller than the relative emission intensity at the center wavelength of the second component.

In the LED lighting device for growing animals and plants according to the present embodiment, the relative emission intensity at the central wavelength of the second component is 0.5 times or more and 0.7 times as large as the relative emission intensity at the central wavelength of the first component. The relative emission intensity at the central wavelength of the third component may be 0.3 times or more and 0.5 times or less the relative emission intensity at the central wavelength of the first component.

The LED lighting device for growing animals and plants according to the present embodiment is an LED lighting device for growing animals and plants, in which a plurality of LED chips are arranged, and the chromaticity of light from the LED chips is represented by an xy chromaticity diagram. , (0.39, 0.36), (0.41, 0.44), (0.46, 0.44), (0.42, 0.36) It is in the area.

In the LED lighting device for growing animals and plants according to the present embodiment, 10 or more LED chips may be arranged in series, and 4 or more rows of the LED chips may be arranged in parallel.

In the LED lighting device for growing animals and plants according to the present embodiment, the LED chip may be covered with a transparent protective film.

In the LED lighting device for growing plants and animals according to the present embodiment, a substrate film and a metal wiring portion formed on the surface of the substrate film are provided, and the plurality of LED chips are mounted on the metal wiring portion. Good.

In the LED lighting device for growing plants and animals according to the present embodiment, the thickest portion may have a thickness of 5 mm or less.

The LED lighting module for growing animals and plants according to the present embodiment is an LED lighting module for growing animals and plants, and the LED lighting device for growing animals and plants according to the present embodiment and the LED lighting device for growing animals and plants are electrically connected to each other. The control unit is connected externally to the LED lighting device for growing animals and plants.

In the LED lighting module for growing plants and animals according to the present embodiment, a constant voltage may be applied from the control unit to the LED lighting device for growing plants and animals.

In the LED lighting module for growing plants and animals according to the present embodiment, the control unit may be capable of controlling dimming of the LED chip.

The shelf board for growing shelves of animals and plants according to the present embodiment is a shelf board for growing shelves of animals and plants, and a substrate and an LED lighting device for growing animals and plants according to the present embodiment, which is attached to the board. Alternatively, the LED lighting module for growing animals and plants according to the present embodiment is provided.

The animal and plant growing shelf according to the present embodiment is an animal and plant growing shelf, and is provided with a shelf plate, and the shelf plate is attached to the lower surface side of the substrate, and the LED lighting for growing animals and plants according to the present embodiment. The device or the LED lighting module for growing animals and plants according to the present embodiment.

In the animal and plant growing shelf according to the present embodiment, the LED lighting device for growing animals and plants may be further arranged on a side surface side of the shelf board.

The plant and animal cultivating plant according to the present embodiment includes a building and the plant and animal cultivating rack according to the present embodiment arranged inside the building.

According to the present embodiment, animals and plants can be obtained in good yield.

FIG. 1 is a schematic diagram showing an LED lighting module according to one embodiment. FIG. 2 is a plan view showing an LED lighting sheet according to an embodiment. 3A and 3B are plan views showing modified examples of the LED lighting sheet. FIG. 4A is a graph showing the relationship between time and voltage when a constant voltage is applied from the control unit to the LED lighting sheet, and FIG. 4B is a comparative example in which a pulse is applied to the LED lighting sheet. It is a graph which shows the relationship between time and voltage in the case of performing. FIG. 5 is a cross-sectional view (cross-sectional view taken along the line VV of FIG. 2) showing the LED lighting sheet according to the embodiment. FIG. 6 is a diagram showing each component and light emission spectrum of light from the LED chip of the LED lighting sheet according to the embodiment. FIG. 7 is an xy chromaticity diagram showing the chromaticity of light from the LED chip of the LED lighting sheet according to the embodiment, and is an xy chromaticity diagram in which isothermal lines of color temperature are described. 8A to 8H are cross-sectional views showing a method for manufacturing an LED lighting sheet according to one embodiment. FIG. 9 is a schematic perspective view showing a plant growing factory according to one embodiment. FIG. 10 is a schematic perspective view showing a plant growth shelf according to one embodiment. FIGS. 11A and 11B are views showing a modified example of the plant growth shelf.

In the LED lighting device for growing animals and plants according to the present embodiment, a plurality of LED chips are arranged, and the light source color of the LED chip is a light bulb color or a warm white color among the light source colors defined in JIS Z 9112.

In the LED lighting device for growing animals and plants according to the present embodiment, the light source color of the LED chip is a light bulb color or a warm white color among the light source colors defined in JIS Z 9112. It is possible to increase the growth amount of animals and plants that are grown while suppressing the decrease, and obtain animals and plants with a good yield. By the way, improvement of profitability is mentioned as a main problem of an animal and plant growing plant that cultivates plants by artificial light. As factors that improve profitability, for example, in the case of plants, in addition to selecting a cultivation target with a high unit price, growth promotion for large growth in a short period of time, reduction of costs such as initial cost and running cost, etc. are considered. To be For example, there is a growth control technique using two types of LED chips, a red LED chip and a blue LED chip, as a plan for promoting growth by promoting photosynthesis. However, when using two types of LED chips, it is necessary to prepare two types of LED chips, and it is difficult to reduce the cost. Further, in recent years, it has been proved that even leafy vegetables can absorb green light to perform photosynthesis. For this reason, a white LED chip is sufficient as a light source, and it is desired to efficiently grow a plant by an LED lighting device using a white LED chip that is mass-produced. On the other hand, according to the present embodiment, the light source color of the LED chip is a light bulb color or a warm white color among the light source colors defined in JIS Z 9112, so that plants can be efficiently grown. , Good yields are obtained.

Further, in the LED lighting device for growing animals and plants according to the present embodiment, a plurality of LED chips are arranged, and the emission spectrum of light from the LED chips has a first peak with a central wavelength of 610 nm or more and 630 nm or less, It has a second peak having a wavelength of 440 nm or more and 460 nm or less and a third peak having a center wavelength of 510 nm or more and 530 nm or less, and the relative emission intensity at the first peak is relative to the second peak. The emission intensity is higher than the emission intensity, and the relative emission intensity at the third peak is smaller than the relative emission intensity at the second peak.

In the LED lighting device for growing animals and plants according to the present embodiment, the emission spectrum S of light from the LED chip 21 has a first peak P1 having a central wavelength of 610 nm to 630 nm and a central wavelength of 440 nm to 460 nm. It has a certain second peak P2 and a third peak P3 having a center wavelength of 510 nm or more and 530 nm or less. The relative emission intensity at the center wavelength of the first peak P1 is larger than the relative emission intensity at the center wavelength of the second peak P2, and the relative emission intensity at the center wavelength of the third peak P3 is the second peak. It is smaller than the relative emission intensity at the central wavelength of P2. As a result, the light from the LED chip 21 becomes white, and the light source color of the LED chip 21 can be a light bulb color or warm white. Therefore, the effects described above can be obtained.

In the LED lighting device for growing animals and plants according to the present embodiment, a plurality of LED chips are arranged, and the light from the LED chips has a center wavelength of 610 nm or more and 630 nm or less and a half width of 90 nm or more and 110 nm or less. A second component having a center wavelength of 440 nm or more and 460 nm or less and a half width of 10 nm or more and 20 nm or less, and a third component having a center wavelength of 510 nm or more and 530 nm or less and a half width of 50 nm or more and 60 nm or less The relative emission intensity at the central wavelength of the first component is larger than the relative emission intensity at the central wavelength of the second component, and the relative emission intensity at the central wavelength of the third component is , Smaller than the relative emission intensity at the center wavelength of the second component.

In the LED lighting device for growing animals and plants according to the present embodiment, the light from the LED chip 21 has a center wavelength of 610 nm or more and 630 nm or less and a half-value width of 90 nm or more and 110 nm or less, and a center wavelength. Is 440 nm or more and 460 nm or less and a half value width is 10 nm or more and 20 nm or less, and a third component C3 having a center wavelength of 510 nm or more and 530 nm or less and a half value width of 50 nm or more and 60 nm or less. Have Further, the relative emission intensity at the center wavelength of the first component C1 is larger than the relative emission intensity at the center wavelength of the second component C2, and the relative emission intensity at the center wavelength of the third component C3 is the second component. It is smaller than the relative emission intensity at the center wavelength of C2. As a result, the light from the LED chip 21 becomes white, and the light source color of the LED chip 21 can be a light bulb color or warm white. Therefore, the effects described above can be obtained.

In the LED lighting device for growing animals and plants according to the present embodiment, a plurality of LED chips are arranged, and the chromaticity of light from the LED chips is (0.39, 0.36), (0 .41, 0.44), (0.46, 0.44), and (0.42, 0.36).

In the LED lighting device for growing animals and plants according to the present embodiment, the chromaticity of light from the LED chip 21 is (0.39, 0.36), (0.41, 0.44) in the xy chromaticity diagram. , (0.46, 0.44), (0.42, 0.36) in a rectangular area connecting the four chromaticity coordinates. In this case, the light from the LED chip 21 becomes white, and the light source color of the LED chip 21 can be a light bulb color or warm white. Therefore, the effects described above can be obtained.

The animal and plant growing LED lighting module according to the present embodiment includes an animal and plant growing LED lighting device, and a controller electrically connected to the LED lighting device, and the controller is the LED. It is externally connected to the lighting device.

Since the LED lighting module for cultivating animals and plants according to the present embodiment has an external control unit, it is possible to increase the amount of cultivated animals and plants while suppressing a decrease in the yield of cultivated animals and plants. In good yield. The heat locally generated in the vicinity of the control unit strongly affects the plants and animals cultivated in the vicinity of the control unit, and has a low influence on the plants and animals cultivated in the place distant from the control unit. Therefore, there is a possibility that variations in the growing state of plants and animals will occur, the number of non-conforming products will increase, and the yield will decrease. According to the LED lighting module in which the control unit is externally connected to the LED lighting device, the control unit can be installed at an arbitrary location, so that variation can be suppressed and good yield can be obtained.

The shelf plate for animal and plant growing shelves according to the present embodiment, the animal and plant growing shelf, and the animal and plant growing factory are provided with the LED lighting device or module for animal and plant growing according to the above-described present embodiment, so that good yield of animals and plants can be obtained. Can be obtained at

An embodiment will be specifically described below with reference to the drawings. Each drawing shown below is a schematic illustration. Therefore, the size and shape of each part are exaggerated as appropriate for easy understanding. In addition, it is possible to appropriately change and implement the embodiments without departing from the technical idea. In the drawings shown below, the same reference numerals are given to the same portions, and detailed description may be partially omitted. In addition, the numerical values such as the dimensions of each member and the material names described in the present specification are examples of the embodiments, and the present invention is not limited to these and can be appropriately selected and used. In the present specification, terms that specify a shape or a geometric condition, such as parallel, orthogonal, and vertical terms, mean not only the strict meaning but also the substantially same state. As used herein, animals and plants mean animals and/or plants. In the following, for convenience, a case of growing (cultivating) a plant with an LED lighting module will be described as an example, but it can be applied to a case of growing an animal as long as no contradiction occurs.

(LED lighting module for growing plants)
The LED lighting module 10 for plant cultivation (hereinafter, also referred to as LED lighting module 10) according to the present embodiment shown in FIG. 1 is provided in a plant cultivation factory 90 (FIG. 9) using artificial light as described later. It is installed and grows plants. Such an LED lighting module 10 includes an LED lighting sheet (LED lighting device) 20 for growing plants (hereinafter, also referred to as an LED lighting sheet 20) and a control unit 40 electrically connected to the LED lighting sheet 20. I have it.

As shown in FIG. 2, the LED lighting sheet 20 is a so-called planar light source sheet, and a plurality of LED chips 21 are arranged on the light emitting surface side (the side facing the plant direction when in use) of the sheet surface. is there. By using the LED lighting sheet 20 of the direct type as described above, the irradiation light from the LED chip 21 directly passes through the light emitting surface and directly reaches the plant directly below, so that the amount of light is increased to promote the growth of the plant. In addition, it is possible to reduce the thickness of the entire sheet so that the shadow on the side of the LED chip 21 is less likely to occur. Note that FIG. 2 shows an example of the direct type LED lighting sheet 20, but the present invention is not limited to this, and an edge light type LED lighting sheet with a light guide plate or the like interposed may be used. The edge light type LED lighting sheet easily suppresses the variation in the amount of light from the light emitting surface. The LED illumination sheet 20 of FIG. 2 includes a flexible wiring board 30 and a plurality of LED chips 21 regularly arranged on the flexible wiring board 30. By using such a flexible wiring board 30, the LED lighting sheet 20 having a relatively large sheet surface area can be obtained. Generally, in a plant growing factory or a plant growing shelf, a plurality of LED lighting sheets 20 are arranged and used. However, when the positions of the adjacent LED lighting sheets 20 vary, the light amount varies and the yield of plants increases. May decrease. The LED lighting sheet 20 having a relatively large sheet surface area can reduce the number of LED lighting sheets 20 to be used, so that it is possible to suppress variations in the light amount due to the arrangement of the plurality of LED lighting sheets 20. Although FIG. 2 shows an example of the LED lighting sheet 20 including the flexible wiring board 30, the present invention is not limited to this, and an LED lighting sheet including a rigid wiring board may be used. The LED lighting sheet provided with the rigid wiring board has high resistance to stress and is not easily damaged. Note that, in FIG. 2, the display of the light-reflective insulating protective film 34 and the transparent protective film 35 described later is omitted.

In this case, the LED chips 21 are arranged in the flexible wiring board 30 in a grid shape in a plan view. That is, the LED chips 21 are arranged in a matrix form in multiple stages and multiple rows, and N rows of the LED chips 21 connected in series are arranged in N rows. For example, in FIG. 2, 14 (M=14) LED chips 21 are connected in series along the first array direction (X direction) of the LED chips 21. Furthermore, the row R having the 14 LED chips 21 is arranged in parallel in 10 rows (N=10) along the second arrangement direction (Y direction) of the LED chips 21. The number of LED chips 21 arranged is not limited to this. Specifically, 10 or more and 14 or less (14≧M≧10) LED chips 21 are arranged in series in the first array direction (X direction), and this row R is the second array of the LED chips 21. It is preferable to arrange them in parallel in the direction (Y direction) from 4 rows to 10 rows (10≧N≧4). By arranging 10 or more LED chips 21 in series, the LED chips 21 can be arranged at short intervals along the first arrangement direction (X direction), and the in-plane variation of the illuminance of the LED lighting sheet 20 can be reduced. It is possible to suppress, and it is possible to suppress variations in the light that irradiates the plant. By arranging 14 or less LED chips 21 in series, power consumption can be reduced and running costs such as utility costs in the plant growing factory 90 can be reduced. Further, by arranging the rows of the LED chips 21 in parallel in four rows or more in the second array direction (Y direction) of the LED chips 21, even if a specific LED chip 21 is damaged, the LED chips 21 of the other rows are arranged. Therefore, it is possible to prevent the illuminance of the entire LED lighting sheet 20 from being extremely reduced. Further, by limiting the range in which the illuminance of the LED lighting sheet 20 is reduced, the range in which an incompatible product may be generated is limited, and the reduction in yield can be suppressed. Further, when the LED lighting sheet 20 is of a direct type, there is a high possibility that the LED chip 21 may be accidentally and strongly contacted and damaged during installation or cleaning. Is important in terms of. Furthermore, by arranging 10 or less rows of the LED chips 21 in parallel, it is possible to reduce power consumption and reduce running costs such as utility costs in the plant growing factory 90.

The LED lighting sheet 20 has a plurality of metal wiring portions 22, and the plurality of metal wiring portions 22 are arranged along the first arrangement direction (X direction). The plurality of metal wiring portions 22 arranged along the first arrangement direction (X direction) correspond to the respective columns R of the LED chips 21. The LED chips 21 are arranged so as to straddle a pair of metal wiring portions 22 adjacent to each other in the X direction. Each terminal (not shown) of the LED chip 21 is electrically connected to the pair of metal wiring portions 22. The plurality of metal wiring parts 22 constitute a power feeding part to the LED chips 21, and when the plurality of metal wiring parts 22 are supplied with electric power, all the LED chips 21 arranged in the row R are turned on. .. The plurality of metal wiring portions 22 form part of a metal wiring portion 32 described later.

The interval Px between the LED chips 21 in the first arrangement direction (X direction) is preferably 37 mm or more and 50 mm or less. Further, the interval Py between the LED chips 21 in the second arrangement direction (Y direction) is preferably 37 mm or more and 100 mm or less. By setting the interval between the LED chips 21 within the above range, the brightness of the LED lighting sheet 20 is made uniform in the plane, the variation of the light irradiating the plant is suppressed, and the power consumption of the LED lighting sheet 20 is suppressed. You can

The thickness of the thickest part of the LED lighting sheet 20 is preferably 5 mm or less. By thus reducing the thickness of the LED lighting sheet 20, the vertical space between the substrates 81 (FIG. 10) on which the LED lighting sheet 20 is installed can be narrowed, whereby the growing shelf 80 (for each plant) ( The number of substrates 81 per (FIG. 10) can be increased. As a result, the yield of plants per unit area can be increased. Further, when the plant and the LED lighting sheet 20 are close to each other, it is possible to further suppress the variation in the relatively strong light with which the plant is irradiated.

The array of the LED chips 21 is not limited to the grid point shape in a plan view, and may be arranged in a staggered shape in a plan view as shown in FIG. Further, the LED chips 21 do not have to be evenly arranged in the plane of the LED lighting sheet 20. For example, the density of the LED chips 21 may be further increased in the peripheral portion of the LED lighting sheet 20. Specifically, as shown in FIG. 3( b ), the LED chips 21 are arranged in a grid pattern at the center of the LED lighting sheet 20 (the lower part of FIG. 3( b )), and the peripheral edge of the LED lighting sheet 20 is arranged. The LED chips 21 may be arranged in a staggered manner (in the upper part of FIG. 3B). Accordingly, it is possible to suppress a decrease in the brightness of the LED lighting sheet 20 in the peripheral portion of the LED lighting sheet 20, make the brightness of the LED lighting sheet 20 uniform in the plane, and suppress the variation of the light irradiating the plant. ..

The overall shape of the LED lighting sheet 20 is a rectangular shape in plan view, but the size and the planar shape of the LED lighting sheet 20 are not particularly limited. Since the LED lighting sheet 20 has a high degree of freedom in processing the size and shape, it is possible to flexibly meet various demands in this regard. Further, by utilizing its flexibility, it is possible to attach to not only a flat installation surface but also various installation surfaces. Further, since the LED lighting sheet 20 itself has rigidity, for example, by bending the LED lighting sheet 20 into a cylindrical shape so that the LED chip 21 is on the outer side, the LED lighting sheet 20 alone is illuminated even if there is no installation surface. It is also possible.

In FIG. 2, the length Lx of the LED lighting sheet 20 in the first arrangement direction (X direction) is preferably 500 mm or more and 700 mm or less, and more preferably 550 mm or more and 650 mm or less. The length Ly of the LED lighting sheet 20 in the second arrangement direction (Y direction) is preferably 300 mm or more and 500 mm or less, and more preferably 350 mm or more and 450 mm or less. By setting the size of the LED lighting sheet 20 within the above range, the LED lighting sheet 20 can be adapted to the general substrate 81 for growing plants (FIG. 10), and the dead space of the substrate 81 can be reduced. .. Further, since the size of each LED lighting sheet 20 is not too large, when a specific LED chip 21 is damaged, it is possible to minimize the influence on other LED chips 21 and to grow plants. It is possible to prevent the illuminance of the entire shelf plate 83 (FIG. 10) for shelves from extremely decreasing and to limit the range in which the illuminance decreases.

Next, the control unit 40 will be described. As shown in FIG. 1, the control unit 40 supplies electric power to the LED lighting sheet 20 and controls light emission and the like of the LED lighting sheet 20. The control unit 40 is detachably connected to the LED lighting sheet 20 via a first connector 44A provided on the LED lighting sheet 20. That is, the control unit 40 is configured separately from the LED lighting sheet 20, and is externally connected to the LED lighting sheet 20. That is, the control unit 40 is not integrated with the LED lighting sheet 20. As a result, the control unit 40 serving as a heat source can be separated from the LED lighting sheet 20, and the heat from the control unit 40 can be prevented from affecting the growth of plants.

The control unit 40 also includes a power input unit 41, an AC/DC converter (driver) 42, and a PWM control unit 43. Of these, the power input unit 41 is supplied with an alternating voltage having an arbitrary voltage of 100 V to 240 V, for example. The AC/DC converter 42 converts an AC voltage of 100V to 240V into a DC voltage of a constant pressure (for example, 44V). The PWM control unit 43 dims the LED chip 21 of the LED lighting sheet 20 by arbitrarily changing the pulse width of the constant voltage waveform from the AC/DC converter 42. That is, the PWM control unit 43 also serves as a dimming control unit that controls dimming of the LED lighting sheet 20. The constant voltage output from the PWM control unit 43 is applied to the LED lighting sheet 20 via the first connector 44A.

By applying a constant voltage to the LED lighting sheet 20 from the PWM control unit 43 of the control unit 40, unlike the case where the rectified pulse voltage is directly applied to the LED lighting sheet 20, the dimming of the LED chip 21 is performed. It becomes possible to do. That is, the PWM control unit 43 can arbitrarily control the illuminance of the LED chip 21 by appropriately changing the duty ratio of the DC voltage from the AC/DC converter 42. For example, as shown in FIG. 4A, the PWM control unit 43 suppresses the duty ratio of the constant voltage from the AC/DC converter 42 from 100% (solid line) to 50% (dotted line), so that the LED chip 21 The illuminance of can be reduced.

In this way, by appropriately adjusting the illuminance of the LED chip 21, the illuminance of the LED lighting sheet 20 can be adjusted according to the growth stage of the plant, and the degree of growth of the plant can be adjusted. For example, the illuminance of the LED lighting sheet 20 may be lowered in the early stage of growth of small plant leaves, and the illuminance of the LED lighting sheet 20 may be raised in the latter stage of growth of large plant leaves. Alternatively, since the distance between the plant and the LED chip 21 is large in the early growth stage when the plant is short, the illuminance of the LED lighting sheet 20 is increased, and in the late growth stage when the plant is large in height, the plant and the LED chip 21 are long. The illuminance of the LED illumination sheet 20 may be lowered because the distance from the LED illumination sheet 20 is short. As another example of adjusting the illuminance of the LED lighting sheet 20, the illuminance may be increased when the type of plant requires high illuminance, and the illuminance may be decreased when the type of plant that can be grown with low illuminance. The illuminance may be increased when the shipping time is desired to be advanced, and the illuminance may be decreased when the shipping time is to be delayed.

Further, by applying a constant voltage from the PWM control unit 43 to the LED lighting sheet 20, it is possible to increase the integrated light amount of the light from the LED lighting sheet 20 per unit time. That is, for example, the integrated light amount when the constant voltage is applied to the LED lighting sheet 20 (the area of the shaded portion of FIG. 4A) is the integrated light amount when the voltage is applied by the pulse as a comparative example (FIG. 4(b)). Thereby, the light emission efficiency of the light from the LED lighting sheet 20 can be increased, and the plant growth efficiency can be improved.

Referring again to FIG. 1, the LED lighting sheet 20 is provided with the regulator 45. In this case, the regulators 45 are provided corresponding to the respective columns of the LED chips 21, and specifically, the ten regulators 45 are provided corresponding to the 10 columns of the LED chips 21. .. The regulator 45 plays a role of keeping the current flowing through the plurality of LED chips 21 in each column constant. Accordingly, even if one LED chip 21 is damaged, it is possible to prevent an excessive current from flowing to the LED chips 21 in the other columns and prevent the LED chips 21 in the other columns from being damaged. As a result, it is possible to prevent the illuminance of the entire LED lighting sheet 20 from being extremely reduced, and it is possible to suppress variations in the light that illuminates the plants. Further, the regulator 45 can control the amount of current controlled by the connected resistance value for each column, and for example, by changing the control resistance value of the first column and the last column, only the peripheral column outputs. I can give you. Thereby, normally, the aim is to ensure uniformity by laying the LED lighting sheets 20 together without any gaps, but from the viewpoint of cost and ensuring air permeability, it is assumed that the LED lighting sheets 20 are separated by about 5 cm to 10 cm. However, the effect that the seam can be erased can be expected.

Further, the LED lighting sheet 20 is provided with a power supply line 46 branching from the first connector 44A. A second connector 44B is provided on the LED lighting sheet 20. The power supply line 46 is not electrically connected to the LED chip 21 of the LED lighting sheet 20, but is electrically connected to the wiring of another LED lighting sheet 200 having the same configuration as the LED lighting sheet 20. Connected. That is, the power supply line 46 is detachably connected to the wiring of the LED lighting sheet 200 via the second connector 44B and the other first connector 44A provided on the other LED lighting sheet 200. The current from the power supply line 46 is supplied to the other LED lighting sheet 200 via the second connector 44B and the other first connector 44A. Thereby, two LED lighting sheets 20 and 200 can be connected, and these two LED lighting sheets 20 and 200 can be simultaneously controlled by one control part 40. By being able to control a plurality of LED lighting sheets 20 and 200 at the same time by one control unit 40, the number of control units 40 that are heat generation sources can be reduced, so that the heat generated by the control unit 40 can reduce the number of plants. Variation in growth is less likely to occur, and a decrease in yield can be suppressed.

(Each member of the LED lighting sheet)
Next, each member constituting the LED lighting sheet 20 will be described. As shown in FIG. 5, the LED lighting sheet 20 includes a flexible wiring board 30 and a plurality of LED chips 21 arranged on the flexible wiring board 30. Among them, the flexible wiring board 30 has a flexible substrate film 31 and a metal wiring portion 32 formed on the surface (the surface on the light emitting surface side) of the substrate film 31. The metal wiring portion 32 is laminated on the substrate film 31 via the adhesive layer 33.

Each LED chip 21 is mounted on the metal wiring portion 32 in a manner capable of conducting electricity. In this LED lighting sheet 20, the LED chips 21 are mounted on the flexible wiring board 30, so that the plurality of LED chips 21 can be arranged at a desired high density.

A light-reflecting insulating protective film 34 is formed so as to cover a region of the LED lighting sheet 20 except the region where the LED chip 21, the regulator 45, the first connector 44A and the second connector 44B are provided and the peripheral region thereof. ing. The light-reflective insulating protective film 34 is arranged so as to cover the metal wiring portion 32. The light-reflecting insulating protective film 34 is a layer having both an insulating function that contributes to the improvement of the migration resistance of the LED lighting sheet 20 and a light reflecting function that contributes to the improvement of the light environment created by the LED lighting sheet 20. This layer is formed of an insulating resin composition containing a white pigment. A structure without the light-reflective insulating protective film 34 is also possible when the migration resistance and the light reflection function are obtained only by the metal wiring portion 32 and the transparent protective film 35 described later.

A transparent protective film 35 is formed so as to cover the light-reflective insulating protective film 34 and the LED chip 21. The transparent protective film 35 is a resin film mainly formed on the outermost surface (the surface located closest to the light emitting surface) of the LED lighting sheet 20 in order to ensure waterproofness.

A solder portion 36 is provided on the metal wiring portion 32. Each LED chip 21 is electrically connected to the metal wiring portion 32 via the solder portion 36.

(Substrate film)
As the substrate film 31, a flexible resin film can be used. In addition, in the present specification, “having flexibility” means that “a radius of curvature can be bent to at least 1 m, preferably 50 cm, more preferably 30 cm, further preferably 10 cm, and particularly preferably 5 cm. That means.

As a material of the substrate film 31, a thermoplastic resin having high heat resistance and high insulation may be used. As such a resin, a polyimide resin (PI) or polyethylene naphthalate (PEN), which has excellent heat resistance, dimensional stability upon heating, mechanical strength, and durability, can be used. Among them, polyethylene naphthalate (PEN), which has improved heat resistance and dimensional stability by performing heat resistance improvement treatment such as annealing treatment, can be preferably used. Further, polyethylene terephthalate (PET) whose flame retardancy is improved by adding a flame retardant inorganic filler or the like may be used.

The thickness of the substrate film 31 is not particularly limited, but from the viewpoint of not becoming a bottleneck as a heat dissipation path, having heat resistance and insulating properties, and a balance of manufacturing costs, it is generally 10 μm or more and 500 μm or more. Hereafter, it is preferably 50 μm or more and 250 μm or less. Further, the thickness is preferably within the above range from the viewpoint of maintaining good productivity in the case of performing the roll-to-roll method.

(Adhesive layer)
As the adhesive forming the adhesive layer 33, a known resin-based adhesive can be appropriately used. Among these resin adhesives, urethane-based, polycarbonate-based, silicone-based, ester-based or epoxy-based adhesives can be particularly preferably used.

(Metal wiring part)
The metal wiring portion 32 is a wiring pattern formed of a conductive base material such as a metal foil on the surface of the substrate film 31 (the surface on the light emitting surface side). The metal wiring portion 32 is preferably formed on the surface of the substrate film 31 via the adhesive layer 33 by a dry laminating method. The metal wiring part 32 includes the plurality of metal wiring parts 22 described above. The plurality of metal wiring portions 22 include a first metal wiring portion 22A and a second metal wiring portion 22B arranged apart from the first metal wiring portion 22A. The LED chip 21 is mounted on the first metal wiring portion 22A and the second metal wiring portion 22B, and the LED chip 21 is electrically connected to the first metal wiring portion 22A and the second metal wiring portion 22B. Has been done. The LED chip 21 is turned on by the power supplied to the first metal wiring portion 22A and the second metal wiring portion 22B.

The metal wiring portion 32 preferably has both high heat dissipation and high electrical conductivity, and for example, copper foil can be used. In this case, the heat dissipation from the LED chips 21 is stable and an increase in electrical resistance can be prevented, so that the variation in light emission between the LED chips 21 is reduced and stable light emission is possible. In addition, the life of the LED chip 21 is extended. Further, deterioration of peripheral members such as the substrate film 31 due to heat can be prevented, so that the product life of the LED lighting sheet 20 can be extended. Examples of the metal forming the metal wiring portion 32 include metals such as aluminum, gold, and silver in addition to the above copper.

The thickness of the metal wiring portion 32 may be appropriately set according to the magnitude of withstand current required for the flexible wiring board 30. However, the thickness of the metal wiring portion 32 is preferably 10 μm or more in order to suppress the warpage due to the heat shrinkage of the substrate film 31 during the soldering process by the reflow method or the like. On the other hand, the thickness of the metal wiring portion 32 is preferably 50 μm or less, whereby the flexibility of the flexible wiring substrate 30 can be maintained, and deterioration of handling property due to an increase in weight can be suppressed. be able to.

(Solder part)
The solder portion 36 joins the metal wiring portion 32 and the LED chip 21. The soldering can be performed by either a reflow method or a laser method.

(LED chip)
The LED chip 21 is a light emitting element that utilizes light emission at a PN junction portion in which a P-type semiconductor and an N-type semiconductor are joined. The LED chip 21 may have a structure in which a P-type electrode and an N-type electrode are provided on the upper surface and the lower surface of the element, respectively, and a structure in which both the P-type electrode and the N-type electrode are provided on one surface of the element. May be.

In the present embodiment, the light source color of the LED chip 21 is a light bulb color or a warm white color, more preferably a light bulb color, among the light source colors defined in JIS Z 9112. The light source color can be measured by a spectral irradiance meter (for example, CL-500A manufactured by Konica Minolta Co., Ltd.) according to JIS Z 9112. When measuring the light source color, first, the spectral irradiometer is calibrated. Next, the sensor of the spectral irradiance meter is turned to the LED chip 21 to be measured. Then, the measurement of the light source color is started by pressing the measurement button of the spectral irradiance meter.

As described above, the light source color of the LED chip 21 is a light bulb color or a warm white color, whereby it is possible to accelerate the growth of plants, increase the growth amount of plants, and shorten the growth days. As a result, the yield of plants in the plant growing factory 90 can be improved. In addition, since the light source color of the LED chip 21 is a light bulb color, the eyes of the worker working in the plant growing factory 90 are less likely to get tired, and the work efficiency can be improved. The fact that the light source color of the LED chip 21 is a light bulb color or a warm white color makes it possible to efficiently grow plants will be described with reference to Examples described later.

By the way, as described above, in the present embodiment, the LED lighting sheet 20, which is a so-called planar light source sheet, includes the LED chip 21 whose light source color is a light bulb color or a warm white color. Here, it is considered that the light bulb color or the warm white color has better quantum efficiency of photosynthesis than the neutral white color. Therefore, since the light source color of the LED chip 21 is a light bulb color or warm white, it is possible to promote the growth of the plant body as compared with the case where the light source color of the LED chip 21 is a neutral white color.

In this case, the color temperature of the light from the LED chip 21 is 2,600 K or more and 3,800 K or less, preferably 2,600 K or more and 3,250 K or less, and more preferably 2850 K or more and 3150 K or less. When the color temperature of the light from the LED chip 21 is 2,600 K or more and 3,800 K or less, it is possible to accelerate the growth of plants, increase the growth amount of plants, and shorten the growth days. As a result, the yield of plants in the plant growing factory 90 can be improved.

Further, as shown in FIG. 6, in the present embodiment, the emission spectrum S of light from the LED chip 21 (see the solid line in FIG. 6) has a first peak P1 having a central wavelength of 610 nm or more and 630 nm or less, It has the 2nd peak P2 whose center wavelength is 440 nm or more and 460 nm or less, and the 3rd peak P3 whose center wavelength is 510 nm or more and 530 nm or less. That is, the emission spectrum S has a first peak P1 existing in the red wavelength range, a second peak P2 existing in the blue wavelength range, and a third peak P3 existing in the green wavelength range. .. The emission spectrum of the light from the LED chip 21 can be measured in the same manner as the light source color using a spectral irradiance meter (for example, CL-500A manufactured by Konica Minolta Co., Ltd.) used for measuring the light source color.

In this case, the relative emission intensity at the center wavelength of the first peak P1 is larger than the relative emission intensity at the center wavelength of the second peak P2, and the relative emission intensity at the center wavelength of the third peak P3 is 2 is smaller than the relative emission intensity at the center wavelength of the peak P2. That is, in the present specification, among the peaks of the emission spectrum S of the light from the LED chip 21, the peak having the highest relative emission intensity is referred to as the first peak P1, and the peak having the second highest relative emission intensity is the second peak. Peak P2, and the peak having the third highest relative emission intensity is called the third peak P3. The light from the LED chip 21 may include four or more peaks. Since the emission spectrum S of the light from the LED chip 21 has the first peak P1, the second peak P2, and the third peak P3 as described above, the light from the LED chip 21 becomes white. In addition, the light source color of the LED chip 21 can be a light bulb color or a warm white color.

Here, the component of the light from the LED chip 21 can be derived based on the emission spectrum S described above. In this case, the light component can be derived by analysis using waveform separation software (for example, "fityk"). At this time, first, the light emission spectrum S of the light is read using the waveform separation software. Next, in the waveform separation software, each peak (for example, the first peak P1, the second peak P2, and the third peak P3) of the read emission spectrum S is selected. Next, the Voigt function is used to perform fitting on the emission spectrum of the measured light. Thereby, each component of light can be derived. In this case, in the waveform after fitting and the waveform of the emission spectrum, the fitting may be repeated until the least square error in the height direction of the waveform becomes 1% or less, and each component of light may be derived.

As shown in FIG. 6, in the present embodiment, the light from the LED chip 21 has a first component C1 having a center wavelength of 610 nm to 630 nm and a half width of 90 nm to 110 nm (broken line in FIG. 6). And a second component C2 having a center wavelength of 440 nm or more and 460 nm or less and a half value width of 10 nm or more and 20 nm or less (see the alternate long and short dash line in FIG. 6) and a half wavelength of 510 nm or more and 530 nm or less. Has a third component C3 of 50 nm or more and 60 nm or less (see the chain double-dashed line in FIG. 6). In this case, the relative emission intensity at the center wavelength of the first component C1 is larger than the relative emission intensity at the center wavelength of the second component C2, and the relative emission intensity at the center wavelength of the third component C3 is It is smaller than the relative emission intensity at the center wavelength of the second component C2. That is, in the present specification, of the light from the LED chip 21, the component having the highest relative emission intensity is referred to as a first component C1, and the component having the second highest relative emission intensity is referred to as a second component C2. The component having the third highest relative emission intensity is called the third component C3. The light from the LED chip 21 may include four or more components. Since the light from the LED chip 21 has the first component C1, the second component C2, and the third component C3 as described above, the light from the LED chip 21 becomes white and the LED chip The light source color of 21 can be a light bulb color or a warm white color.

The relative emission intensity at the center wavelength of the second component C2 is 0.5 times or more and 0.7 times or less the relative emission intensity at the center wavelength of the first component C1, and the center wavelength of the third component C3. The relative emission intensity at is 0.3 to 0.5 times the relative emission intensity at the center wavelength of the first component C1. Thereby, the light source color of the LED chip 21 can be a light bulb color or a warm white color. As described above, the light source color of the LED chip 21 can be a light bulb color or a warm white color, which is considered to have better photosynthetic quantum efficiency than the daylight white color, so that the growth of plants can be promoted. ..

Further, as shown in FIG. 7, in the present embodiment, the chromaticity of light from the LED chip 21 is (0.39, 0.36), (0.41, 0.44) in the xy chromaticity diagram. ), (0.46, 0.44), and (0.42, 0.36) in a quadrangle region (hatched portion in FIG. 7) connecting the four chromaticity coordinates. In this case, the light from the LED chip 21 becomes white, and the color temperature of the light from the LED chip 21 becomes about 2,900 K or more and about 3,600 K or less, as shown in FIG. 7. This makes it possible to accelerate the growth of plants, increase the growth amount of plants, and shorten the growth days. Therefore, the yield of plants in the plant growing factory 90 can be improved. The chromaticity of light from the LED chip 21 can be measured in the same manner as the light source color using a spectral irradiance meter (for example, CL-500A manufactured by Konica Minolta Co., Ltd.) used for measuring the light source color.

Further, it is preferable to select the LED chip 21 having high luminous efficiency. Specifically, as the LED chip 21, it is preferable to use one having a luminous efficiency of 150 lm/W or more, and further preferable to use one having a luminous efficiency of 180 lm/W or more. By increasing the luminous efficiency of the LED chip 21 to 150 lm/W or more, the number (density) of the LED chips 21 mounted can be reduced and the heat generated by the Joule heat from the LED chips 21 can be reduced. As a result, it is possible to prevent variation in plant growth due to the above, and to suppress a decrease in yield.

As described above, the LED lighting sheet 20 is one in which the LED chip 21 is directly mounted on the metal wiring portion 32 that can exhibit high heat dissipation. As a result, even when the LED chips 21 are arranged at a high density, excessive heat generated when the LED chips 21 are turned on is quickly diffused through the metal wiring portion 32, and the LED lighting sheet 20 is externally exposed via the substrate film 31. The heat can be sufficiently radiated to the plant, variation in plant growth due to the heat from the LED chip 21 is less likely to occur, and a decrease in yield can be suppressed.

(Light reflective insulating protective film)
As shown in FIG. 5, the light-reflective insulating protective film 34 is a layer formed in a region except the region where the LED chip 21 is provided and the peripheral region thereof. The light-reflective insulating protective film 34 is a so-called resist layer that has a sufficient insulating property to improve the migration resistance of the flexible wiring board 30, and has a light emission brightness of a light environment created by the LED lighting sheet 20. A light reflecting layer having light reflectivity that contributes to improvement.

The light-reflective insulating protective film 34 can be formed of various resin compositions containing urethane resin as a base resin and further containing a white pigment made of an inorganic filler such as titanium oxide. As the base resin of the resin composition used for forming the light-reflective insulating protective film 34, an acrylic polyurethane resin, a polyester resin, a phenol resin, or the like can be appropriately used in addition to the urethane resin. As the base resin of the resin composition forming the light-reflective insulating protective film 34, it is more preferable to use the same or similar resin as the resin composition forming the transparent protective film 35. For the transparent protective film 35, it is preferable to use an acrylic polyurethane resin as a main material resin, as described later. From this, when the base resin of the resin composition forming the transparent protective film 35 is an acrylic polyurethane resin, the base resin of the resin composition for forming the light reflective insulating protective film 34 is a urethane resin or It is more preferable to use an acrylic polyurethane resin.

Examples of the inorganic filler contained as a white pigment in the resin composition forming the light-reflective insulating protective film 34 include titanium oxide, alumina, barium sulfate, magnesia, aluminum nitride, boron nitride, barium titanate, kaolin, and the like. At least one selected from talc, calcium carbonate, zinc oxide, silica, mica powder, powder glass, powder nickel and powder aluminum can be used.

The thickness of the light-reflective insulating protective film 34 is 5 μm or more and 50 μm or less, and more preferably 7 μm or more and 20 μm or less. When the thickness of the light-reflective insulating protective film 34 is less than 5 μm, the light-reflective insulating protective film becomes thin particularly at the edge portion of the metal wiring portion 32, and when the metal wiring cannot be covered and is exposed. The risk that insulation cannot be maintained increases. On the other hand, the thickness of the light-reflective insulating protective film 34 is preferably 50 μm or less from the viewpoint of holding the light-reflective insulating protective film 34 from the bending of the substrate during handling and transportation.

The light reflectance of the insulating protective film 34 is preferably 65% or more, more preferably 70% or more, and more preferably 80% or more, in terms of light reflectance at wavelengths of 400 nm or more and 780 nm or less. More preferable. The LED lighting sheet 20 contains, for example, titanium oxide in an amount of 20 parts by mass or more based on 100 parts by mass of the urethane-based or acrylic-based polyurethane base resin, so that the thickness of the light-reflecting insulating protective film 34 is set to 8 μm. In this case, the light reflectance of the same layer can be 75% or more.

(Transparent protective film)
The transparent protective film 35 is formed on the outermost surface of the LED lighting sheet 20 so as to cover the LED chip 21. The transparent protective film 35 has waterproofness and transparency. The waterproof property of the transparent protective film 35 can prevent water from entering the inside of the device when the LED lighting sheet 20 is used as a light source for growing plants. When the LED chip 21 having a high luminous efficiency, for example, having a luminous efficiency of 150 lm/W or more is selected, the influence of damage to a specific LED chip 21 in the LED lighting sheet 20 becomes large. Therefore, it is important from the viewpoint of risk management to prevent the LED chip 21 from being damaged as much as possible.

The transparent protective film 35 can be formed of various resin compositions containing an acrylic polyurethane resin or the like as a base resin. As the base resin of the resin composition used for forming the transparent protective film 35, urethane-based resin, polyester-based resin, phenol-based resin and the like can be appropriately used in addition to acrylic-based polyurethane resin. As the base resin of the resin composition forming the transparent protective film 35, it is more preferable to use the same or similar resin as the resin composition forming the light-reflective insulating protective film 34 as the base resin. A preferred specific combination is a combination in which the base resin of the resin composition forming the light-reflective insulating protective film 34 is a urethane resin and the resin forming the transparent protective film 35 is an acrylic polyurethane resin. it can.

The thickness of the transparent protective film 35 is 10 μm or more and 40 μm or less, preferably 15 μm or more and 30 μm or less, and more preferably 20 μm or more and 25 μm or less. By setting the thickness of the transparent protective film 35 in the above range, it is possible to maintain good flexibility and thinness of the LED lighting sheet 20, lightness, and good optical characteristics required for plant growing applications. Further, the LED lighting sheet 20 can be provided with sufficient waterproofness required for plant growing applications.

The water resistance of the LED lighting sheet 20 by the transparent protective film 35 is such that deterioration of the LED chip 21 can be suppressed when water for growing plants is sprayed on the LED lighting sheet 20. It is not particularly limited. Such water resistance is preferably IPX4 or higher in the waterproof/dustproof protection standard established by the IEC (International Electrotechnical Commission). The waterproofness of IPX4 or higher is such that water droplets from all directions do not have a harmful effect on the LED chip 21. Specifically, when water is sprayed from the water spray nozzle at a water amount of 10 L/min for 5 minutes in the entire range of ±180° with respect to the normal direction of the LED lighting sheet 20, the LED chip 21 is adversely affected. It is said that it is not done.

(Method of manufacturing LED lighting sheet)
Next, a method for manufacturing the LED lighting sheet 20 according to the present embodiment will be described with reference to FIGS.

First, the substrate film 31 is prepared (FIG. 8A). Next, on the surface of the substrate film 31, a metal foil 32A such as a copper foil which is a material of the metal wiring portion 32 is laminated (FIG. 8B). The metal foil 32A is adhered to the surface of the substrate film 31 with the adhesive layer 33 made of, for example, a urethane adhesive or the like. Alternatively, the metal foil 32A may be directly formed on the surface of the substrate film 31 by an electrolytic plating method or a vapor deposition method (sputtering, ion plating, electron beam vapor deposition, vacuum vapor deposition, chemical vapor deposition, etc.). Alternatively, the substrate film 31 may be directly welded to the metal foil 32A to be formed.

Next, the etching mask 37 patterned into the shape required for the metal wiring portion 32 is formed on the surface of the metal foil 32A (FIG. 8C). The etching mask 37 is provided so that the portion of the metal foil 32A that will be the metal wiring portion 32 corresponding to the wiring pattern will not be corroded by the etching liquid. The method of forming the etching mask 37 is not particularly limited, and for example, it may be formed by exposing a photoresist or a dry film through a photomask and then developing it. An etching mask may be formed on the surface.

Next, the metal foil 32A located at a portion not covered with the etching mask 37 is removed with an immersion liquid (FIG. 8(d)). As a result, the portion of the metal foil 32A other than the portion that becomes the metal wiring portion 32 is removed.

After that, the etching mask 37 is removed using an alkaline stripping solution. As a result, the etching mask 37 is removed from the surface of the metal wiring part 32 (FIG. 8E).

Then, a light-reflective insulating protective film 34 is laminated on the metal wiring portion 32 (FIG. 8F). The formation of the light-reflective insulating protective film 34 is not particularly limited as long as it is a coating means capable of uniformly coating the resin composition of the material forming the light-reflective insulating protective film 34. For example, screen printing, offset printing, A method such as a dip coater or brush coating can be used. Alternatively, the light-reflective insulating protective film 34 may be formed by coating an insulating protective film material having photosensitivity on the entire surface, exposing only a required portion through a photomask, and then developing.

Next, the LED chip 21, the regulator 45, and the connectors 44A and 44B are mounted on the metal wiring portion 32 (FIG. 8(g)). Note that in FIG. 8G and FIG. 8H described later, the regulator 45 and the like are omitted for clarity. In this case, the LED chip 21 is joined to the metal wiring portion 32 by soldering via the solder portion 36. The joining by soldering can be performed by a reflow method, a laser method, or a conductive resin.

Next, the transparent protective film 35 is formed so as to cover the light reflective insulating protective film 34, the LED chip 21, the regulator 45 and the connectors 44A and 44B (FIG. 8(h)). The transparent protective film 35 is preferably formed by a method of spraying a transparent resin composition by spraying (hereinafter referred to as "spray coating method") or a method of forming by a curtain coating method. The transparent protective film 35 is formed by a spray coating method, for example, by spraying a spray coating application liquid containing an acrylic polyurethane resin onto a desired area on the flexible wiring substrate 30 by a spray coating machine. Can be formed. The transparent protective film 35 is formed by the curtain coating method, for example, by applying a curtain coating processing coating liquid containing an acrylic polyurethane resin to a desired region on the flexible wiring substrate 30 by a curtain coating machine. Can be formed.

The LED lighting sheet 20 according to the present embodiment is not limited to the above-described method, but is a publicly known flexible wiring board for LED chips known in the related art, or a publicly known method for manufacturing various LED modules in which LED chips are mounted thereon. It can also be produced by the method.

(Plant growing factory and plant growing shelf)
FIG. 9: is a figure which shows typically the structure of the plant cultivation factory 90 using the LED lighting sheet 20 by this Embodiment. The plant growing factory 90 includes a building 91 and a plurality of plant growing shelves 80 arranged inside the building 91.

As shown in FIG. 10, the plant growth shelf 80 has a plurality of (four) columns 82 and a plurality of substrates 81 arranged along the columns 82 at intervals in the vertical direction. .. A medium region for growing the plant PL is provided on the upper surface of each substrate 81 except the uppermost substrate 81. The lower surface of each substrate 81 except the lowermost substrate 81 constitutes a ceiling surface with respect to the substrate 81 located below the substrate 81, and the LED lighting sheets 20 are arranged in parallel. In this case, the control unit 40 is arranged at a place sufficiently separated from the LED lighting sheet 20. Therefore, there is less possibility that the plant PL located near the control unit 40 and the plant PL located far from the control unit 40 will have uneven growth due to heat from the control unit 40. Further, the substrate 81 and the LED lighting sheet 20 attached to the lower surface side of the substrate 81 constitute a shelf plate 83 for growing shelves of plants. Alternatively, the substrate 81 and the LED lighting module 10 attached to the lower surface side of the substrate 81 constitute a shelf plate 83 for growing shelves of plants. In the present embodiment, such a shelf plate 83 (FIG. 10) for a plant growing shelf, a plant growing shelf 80 (FIG. 10), and a plant growing factory 90 (FIG. 9) provided with the plant growing shelf 80. Also provide.

Since the LED lighting sheet 20 according to the present embodiment is flexible and lightweight, it is easier to mount the LED lighting sheet 20 on the lower surface of each substrate 81 than a conventional straight tube lighting device or the like. Can be done. Further, since the LED lighting sheet 20 has flexibility, the LED lighting sheet 20 can be attached to the ceiling surface having various sizes and shapes. As a result, the LED lighting sheet 20 according to the present embodiment can be applied to various plant growing shelves 80 and plant growing factories 90.

Further, the LED lighting sheet 20 is thinner than the conventional straight tube type lighting device. Thereby, the space|interval of the board|substrate 81 of an up-down direction can be narrowed, and the number of the board|substrates 81 contained in the growing shelf 80 of each plant can be increased. As a result, the yield of plant PL per unit area can be increased.

As shown in FIGS. 11A and 11B, the LED lighting sheet 20 may be arranged not only on the lower surface of the substrate 81 but also on the side surface side of the substrate 81. The LED lighting sheet 20 on the side surface is hung from the board 81 located above to the board 81 located below the board 81. In this case, as shown in FIG. 11A, the LED lighting sheet 20 may reach the substrate 81 located below. Alternatively, as shown in FIG. 11B, the LED lighting sheet 20 may cover only the upper side of the space located between the upper and lower substrates 81 without reaching the substrate 81 located below. In this way, by further disposing the LED lighting sheet 20 also on the side surface side of the substrate 81, the light amount at the peripheral edge of the substrate 81 where the illuminance tends to be weakened is compensated, and the luminance of the LED lighting sheet 20 is made uniform within the surface. be able to. As a result, the growth of plants can be made uniform in the plane, and the yield of plants to be grown can be improved.

As described above, according to the present embodiment, the light source color of the LED chip 21 is a light bulb color or a warm white color among the light source colors defined in JIS Z 9112. This makes it possible to accelerate the growth of plants, increase the growth amount of plants, and shorten the growth days. That is, since the light source color of the LED chip 21 is a light bulb color or warm white, which is considered to have better photosynthetic quantum efficiency than daylight white, it is possible to promote the growth of plants. As a result, the yield of plants in the plant growing factory 90 can be improved.

Further, according to the present embodiment, the light source color of the LED chip 21 is the light bulb color among the light source colors defined in JIS Z 9112. As a result, the eyes of the worker working in the plant growing factory 90 are less likely to get tired, and the working efficiency can be improved.

Further, according to the present embodiment, the emission spectrum S of the light from the LED chip 21 has a first peak P1 having a center wavelength of 610 nm or more and 630 nm or less and a second peak P1 having a center wavelength of 440 nm or more and 460 nm or less. It has a peak P2 and a third peak P3 having a center wavelength of 510 nm or more and 530 nm or less. The relative emission intensity at the center wavelength of the first peak P1 is larger than the relative emission intensity at the center wavelength of the second peak P2, and the relative emission intensity at the center wavelength of the third peak P3 is the second peak. It is smaller than the relative emission intensity at the central wavelength of P2. As a result, the light from the LED chip 21 becomes white, and the light source color of the LED chip 21 can be a light bulb color or warm white. Therefore, the effects described above can be obtained.

Further, according to the present embodiment, the light from the LED chip 21 has a first component C1 having a center wavelength of 610 nm or more and 630 nm or less and a half width of 90 nm or more and 110 nm or less, and a center wavelength of 440 nm or more and 460 nm. And a third component C2 having a half width of 10 nm or more and 20 nm or less, and a third component C3 having a center wavelength of 510 nm or more and 530 nm or less and a half width of 50 nm or more and 60 nm or less. .. Further, the relative emission intensity at the center wavelength of the first component C1 is larger than the relative emission intensity at the center wavelength of the second component C2, and the relative emission intensity at the center wavelength of the third component C3 is the second component. It is smaller than the relative emission intensity at the center wavelength of C2. As a result, the light from the LED chip 21 becomes white, and the light source color of the LED chip 21 can be a light bulb color or warm white. Therefore, the effects described above can be obtained.

Further, according to the present embodiment, the relative emission intensity at the center wavelength of the second component C2 is 0.5 times or more and 0.7 times or less the relative emission intensity at the center wavelength of the first component C1. The relative emission intensity at the center wavelength of the third component C3 is 0.3 times or more and 0.5 times or less the relative emission intensity at the center wavelength of the first component C1. Thereby, the light source color of the LED chip 21 can be a light bulb color or a warm white color. As described above, the light source color of the LED chip 21 can be a light bulb color or a warm white color, which is considered to have better photosynthetic quantum efficiency than the daylight white color, so that the growth of plants can be promoted. ..

Further, according to the present embodiment, the chromaticity of the light from the LED chip 21 is (0.39, 0.36), (0.41, 0.44), (0. 46, 0.44) and (0.42, 0.36) in a rectangular area connecting the four chromaticity coordinates. In this case, the light from the LED chip 21 becomes white, and the color temperature of the light from the LED chip 21 becomes about 2,900 K or more and about 3,600 K or less. This makes it possible to accelerate the growth of plants, increase the growth amount of plants, and shorten the growth days. Therefore, the yield of plants in the plant growing factory 90 can be improved.

According to the present embodiment, ten or more LED chips 21 are arranged in series, and four or more LED chips 21 are arranged in parallel. As a result, the LED chips 21 can be evenly arranged in the plane, the arrays of the LED chips 21 can be arranged in parallel, and the risk when the LED chips 21 are damaged can be dispersed.

Further, according to the present embodiment, since the LED chip 21 is covered with the transparent protective film 35, it is possible to protect the LED chip 21 from the water splashed when growing the plant.

Further, according to the present embodiment, since the thickness of the thickest part of the LED lighting sheet 20 is 5 mm or less, the distance between the upper and lower substrates 81 of the plant growth shelf 80 is reduced and the number of the substrates 81 is increased. , Can increase the yield of plants per unit area.

Further, according to the present embodiment, since the control unit 40 is externally connected to the LED lighting sheet 20, the control unit 40 is separated from the LED lighting sheet 20, and the plants are affected by the heat from the control unit 40. You can prevent it from reaching.

Further, according to the present embodiment, since a constant voltage is applied to the LED lighting sheet 20 from the control unit 40, it is possible to increase the integrated light amount per unit time from the LED chip 21 and promote the growth of plants.

Further, according to the present embodiment, since the control unit 40 can control the dimming of the LED chip 21, it is possible to adjust the intensity of the light from the LED chip 21 according to the growth stage of the plant. it can.

In addition, although the case where the LED lighting device is a planar light source sheet has been described in the above-described embodiment, the present invention is not limited to this. For example, although not shown, the LED lighting device may be a straight tube lighting device.

[Example]
Next, a specific example of the present embodiment will be described.

(Creation of LED lighting sheet)
The LED lighting sheets of Examples 1 and 2 and Comparative Example were produced as follows.

(Example 1)
A copper foil (thickness: 35 μm) for forming a metal wiring part is laminated on one surface of a 560 mm×390 mm size film substrate (polyethylene naphthalate, thickness: 50 μm), and then a copper foil for a metal wiring is formed. Etching was performed to form metal wiring portions having the same pattern in all the examples and comparative examples. Then, a urethane resin is used as a base resin on the substrate film and the metal wiring portion, and an insulating ink containing 20% by mass of titanium oxide is added to the base resin by screen printing to have a thickness of 10 μm. The light-reflective insulating protective film of was formed. Next, a plurality of LED chips (“NFSW757G-V2” (manufactured by Nichia Corporation)) are provided in the metal wiring portion with 10 rows of 14 rows at a pitch of 40 mm in the X direction and a pitch of 35 mm in the Y direction. It was mounted by soldering. The LED chip is a top-emission type light emitting element, and has an outer shape of a rectangular parallelepiped having a size of 3.0 mm (length)×3.0 mm (width)×0.65 mm (height). The light source color of this LED chip is a light bulb color, and the color temperature of each LED chip is 3000K. Further, the insulating protective film and the transparent protective film that covers the LED chip were formed by a spray coating method. The LED lighting sheet manufactured as described above was used as the LED lighting sheet of Example 1.

(Example 2)
An LED produced in the same manner as in Example 1 except that an LED chip having a light source color of warm white and a color temperature of 3500K (“NFSW757G-V2” (manufactured by Nichia Corporation)) was used. The illumination sheet was the LED illumination sheet of Example 2.

(Comparative example)
An LED produced in the same manner as in Example 1 except that an LED chip having a daylight white color and a color temperature of 5000 K (“NFSW757G-V2” (manufactured by Nichia Corporation)) was used. The illumination sheet was the LED illumination sheet of the comparative example.

The optical characteristics of the LED chips used in the LED lighting sheets of Examples 1 and 2 and the comparative example, specifically, the light emission spectrum were measured. The light emission spectrum was measured by a spectroradiometer (CL-500A, manufactured by Konica Minolta). The measured emission spectrum has a first peak, a second peak and a third peak, respectively, and the center wavelengths of the first peak, the second peak and the third peak were respectively measured.

In addition, with respect to the LED chips used in the LED lighting sheets of Examples 1 and 2 and Comparative Example, the light component was derived from the measured emission spectrum using the waveform separation software “fityk”. At this time, first, the emission spectrum of the measured light was read, and the first peak, the second peak, and the third peak were selected. Next, the Voigt function was used to perform fitting on the emission spectrum of the measured light. Then, in the waveform after fitting and the waveform of the emission spectrum, the fitting is repeated until the error in the height direction of the waveform becomes 1% or less, and the first component, the second component, and the third component of the light are separated. Derived. Then, the center wavelengths and the half widths of the derived first component, second component, and third component were measured, respectively.

Subsequently, the LED lighting sheets of Examples 1 and 2 and Comparative Example were attached to plant growing shelves, and plants (baby spinach) were actually cultivated. Then, the fresh weight (g/m ² ) of the grown plant was measured. This measurement of the fresh weight was calculated by measuring the above-ground fresh weight after cultivation for each cultivation panel and calculating the weight per square meter. Moreover, the daily production body weight (g/m ² /day), which is the fresh weight per number of cultivation days, was calculated. Table 1 shows the above evaluation results.

As shown in Table 1 above, when the LED lighting sheets of Examples 1 and 2 were used, the living weight of the plant could be increased more than when the LED lighting sheets of Comparative Examples were used. Specifically, the case where the LED lighting sheet of Example 1 (the light source color of the LED chip is a light bulb color) was used was compared with the case where the LED lighting sheet of the comparative example (the light source color of the LED chip was a neutral white color) was used. It was possible to increase the daily production body weight (g/m ² /day) by 9%. Moreover, when the LED lighting sheet of Example 2 (the light source color of the LED chip is warm white) is used, Nissan is compared with the case where the LED lighting sheet of the comparative example (the light source color of the LED chip is neutral white) is used. The raw weight (g/m ² /day) could be increased by 6%. As described above, in the case of using the LED lighting sheets of Examples 1 and 2, the light source color of the LED chips was changed to the bulb color or the warm white color, whereby the productivity of plants could be improved.

It is also possible to appropriately combine a plurality of constituent elements disclosed in the above-described embodiments and modifications. Alternatively, some constituent elements may be deleted from all the constituent elements shown in the above-described embodiments and modifications.

10 LED Lighting Module 20 LED Lighting Sheet 21 LED Chip 22 Metal Wiring Section 30 Flexible Wiring Board 31 Board Film 32 Metal Wiring Section 33 Adhesive Layer 34 Light Reflective Insulation Protective Film 35 Transparent Protective Film 36 Solder Section 40 Control Section 41 Power Input Part 42 AC/DC converter 43 PWM control part 44A First connector 44B Second connector 45 Regulator 46 Power supply line 80 Plant growing shelf 81 Substrate 82 Pillar 83 Shelf plate for plant growing shelf 90 Plant growing factory 91 Building

Claims (17)

An LED lighting device for growing animals and plants, wherein a plurality of LED chips are arranged,
The LED lighting device for growing animals and plants, wherein the light source color of the LED chip is a light bulb color or a warm white color among the light source colors defined in JIS Z 9112. The LED lighting device according to claim 1, wherein the light source color of the LED chip is the light bulb color. An LED lighting device for growing animals and plants, wherein a plurality of LED chips are arranged,
The emission spectrum of the light from the LED chip is
A first peak having a center wavelength of 610 nm or more and 630 nm or less;
A second peak having a center wavelength of 440 nm or more and 460 nm or less;
And a third peak having a central wavelength of 510 nm or more and 530 nm or less,
The relative emission intensity at the first peak is greater than the relative emission intensity at the second peak,
The LED lighting device for growing animals and plants, wherein the relative emission intensity at the third peak is smaller than the relative emission intensity at the second peak. An LED lighting device for growing animals and plants, wherein a plurality of LED chips are arranged,
The light from the LED chip has a first component having a center wavelength of 610 nm or more and 630 nm or less and a half width of 90 nm or more and 110 nm or less,
A second component having a center wavelength of 440 nm or more and 460 nm or less and a half width of 10 nm or more and 20 nm or less;
A third component having a center wavelength of 510 nm or more and 530 nm or less and a half width of 50 nm or more and 60 nm or less,
The relative emission intensity at the central wavelength of the first component is larger than the relative emission intensity at the central wavelength of the second component,
The LED lighting device for growing plants and animals, wherein the relative emission intensity of the third component at the central wavelength is smaller than the relative emission intensity of the second component at the central wavelength. The relative emission intensity at the center wavelength of the second component is 0.5 times or more and 0.7 times or less the relative emission intensity at the center wavelength of the first component, and the relative emission intensity at the center wavelength of the third component is The LED lighting device for growing plants and animals according to claim 4, wherein the emission intensity is 0.3 times or more and 0.5 times or less of the relative emission intensity at the center wavelength of the first component. An LED lighting device for growing animals and plants, wherein a plurality of LED chips are arranged,
The chromaticity of the light from the LED chip is (0.39, 0.36), (0.41, 0.44), (0.46, 0.44), (0. 42, 0.36) is an LED lighting device for growing plants and animals in a rectangular area connecting four chromaticity coordinates. The LED lighting device according to claim 1, wherein 10 or more LED chips are arranged in series, and 4 or more rows of the LED chips are arranged in parallel. The LED lighting device for growing animals and plants according to any one of claims 1 to 7, wherein the LED chip is covered with a transparent protective film. The animal and plant according to any one of claims 1 to 8, further comprising a substrate film and a metal wiring portion formed on a surface of the substrate film, wherein the plurality of LED chips are mounted on the metal wiring portion. LED lighting device for growing. The LED lighting device for growing animals and plants according to any one of claims 1 to 9, wherein the thickest portion has a thickness of 5 mm or less. An LED lighting module for growing animals and plants,
An LED lighting device for growing animals and plants according to any one of claims 1 to 10,
A control unit electrically connected to the LED lighting device for growing animals and plants,
The control unit is an LED lighting module for growing plants and animals, which is externally connected to the LED lighting device for growing plants and animals. The LED lighting module for growing animals and plants according to claim 11, wherein a constant voltage is applied from the control unit to the LED lighting device for growing animals and plants. The LED lighting module for growing animals and plants according to claim 11 or 12, wherein the control unit can control the dimming of the LED chip. A shelf board for growing shelves of animals and plants,
Board,
An LED lighting device for growing animals and plants according to any one of claims 1 to 10 or an LED lighting module for growing animals and plants according to any one of claims 11 to 13, which is attached to the substrate. , Shelf boards for growing shelves of plants and animals. A shelf for growing plants and animals,
Equipped with shelves,
The said shelf board was attached to the lower surface side of the board|substrate, The LED lighting device for animal and plant growth of any one of Claim 1 thru|or 10, or the animal and plant growth of any one of Claim 11 thru|or 13. A growing shelf for animals and plants, comprising an LED lighting module. The animal and plant growing rack according to claim 15, wherein the LED lighting device for growing plants and animals is further arranged on a side surface side of the shelf board. Building,
An animal and plant growing plant, comprising the animal and plant growing shelf according to claim 15 or 16, which is arranged inside the building.

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