JP6800729B2 - Lighting equipment for plant cultivation, lighting equipment for articulated plant cultivation, and plant cultivation equipment - Google Patents

Description

The present invention relates to a plant cultivation lighting device, a connected plant cultivation lighting device, and a plant cultivation device.

Conventionally, in plant cultivation, a technique of irradiating plant seedlings with artificial light to promote seedling raising has been adopted. By promoting the growth of plants, the cultivation period can be shortened and the number of harvests in the same place can be increased. Moreover, even in the same cultivation period, if the plant can be grown larger, the yield can be increased.

In a plant cultivation lighting device used for irradiating artificial light, as a configuration in which a plurality of point light sources such as light emitting diodes are arranged, a configuration in which they are arranged in a plane or a configuration in which they are arranged in a straight line is known.

Japanese Unexamined Patent Publication No. 2014-217280 JP-A-59-120034 Japanese Unexamined Patent Publication No. 2014-157757 Japanese Patent No. 5779678

Here, most of the lighting devices for plant cultivation in which a plurality of point light sources are arranged in a straight line are those in which the point light sources are evenly arranged. In this case, directly below both ends of the lighting device for plant cultivation. There is a problem that the illuminance of the region is significantly inferior to that of the region directly below the central portion. The results of actual confirmation of this problem are shown below.

FIG. 24A shows a line of point light sources of a linear lighting device using a small white lamp OSAWFLZ2C1P manufactured by Optosuppley as a point light source and a linear lighting device in which 50 point light sources are arranged at equal intervals in 1160 mm. It is a graph which shows the result of having measured the illuminance on the irradiation surface which faced and separated by 200 mm. FIG. 24A also shows the result of simulating with the lighting design analysis software with the same settings (model). The lighting design analysis software used here is Light Tools of Optical Research Associates.
The horizontal axis is the coordinates indicating the position of the linear illuminator, and X = 0 is the position of the center of the linear illuminator. Since the arrangement of the point light sources is symmetrical with respect to the center (X = 0) on both sides, only one half is taken. The vertical axis indicates the illuminance at each position (X), and the maximum illuminance (the illuminance at X = 133 in the case of the actual product and the illuminance at X = 0 in the case of the model) is set to 1 and the illuminance is determined by the relative illuminance. Is shown.
As shown in FIG. 24A, in both the actual and model results, the illuminance is significantly reduced to about 65% of the maximum illuminance at X = 522 mm, and is maximum at X = 580 mm at the end. It was reduced to less than 60% of the illuminance.

As a method for solving such a problem of non-uniform illuminance distribution, a special light diffuser is provided in the irradiation portion of the linear illumination device (Patent Document 1), and special banners are provided at both ends of the linear illumination device. It has been proposed to provide (Patent Document 2) and to make a plurality of light sources of a linear lighting device have a predetermined angular relationship with the optical axis direction of the light source (Patent Document 3).

However, since the structure is complicated in each case, another problem arises that maintenance of the linear lighting device is troublesome.

Therefore, as shown conceptually in FIG. 24 (b), in order to improve the illuminance in the region directly under both ends without complicating the structure of the linear illuminating device and making maintenance as easy as before. In addition, a linear lighting device was manufactured in which the light output density was increased according to the decrease in illuminance as it approached both ends, but the illuminance had a distribution as shown in FIG. 24 (c), which was expected. On the contrary, no illuminance was obtained to improve the non-uniformity. That is, it was not possible to improve the decrease in illuminance even with a point light source arrangement pattern having a light output density distribution that simply compensates for the decrease in illuminance in the illuminance distribution on the irradiated surface.

Based on this unexpected result, the present inventor has conducted extensive research, and by arranging the point light sources in a specific arrangement, the light that solves the problem when the conventional point light sources are evenly arranged (equally spaced). We have found that an output density distribution can be obtained, and completed the present invention.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a lighting device for plant cultivation in which a decrease in illuminance in a region directly below both ends is suppressed without providing ancillary equipment such as a light diffuser. And.

The present invention provides the following means for solving the above problems.

(1) The lighting device for plant cultivation according to one aspect of the present invention is a lighting device for plant cultivation having a row of point light sources in which a plurality of point light sources are arranged in a straight line on a substrate. The regions in which the plurality of point light sources are arranged include a first end portion which is one end portion, a second end portion which is an end portion opposite to the first end portion, the first end portion, and the said portion. A central portion arranged between the second end portions, a first boundary portion arranged between the first end portion and the central portion, and a second boundary portion arranged between the second end portion and the central portion. The first end portion and the second end portion have the maximum light output density, and the first boundary portion and the second boundary portion have a minimum region of the light output density, and the central portion thereof. The plurality of point light sources are arranged so that the light output density is equal to or higher than the minimum light output density and lower than the maximum light output density.

(2) In the lighting device for plant cultivation according to (1) above, the light output densities of the plurality of point light sources constituting the point light source sequence are equal, and the plurality of point light sources have the following (i) and (ii). (I) The average number density of the point light sources is 2.6 / 100 mm to 26/100 mm, and (ii) the area where the point light sources are arranged is 30 mm wide. When divided into a plurality of equally spaced divisions of ~ 85 mm, the first end portion and the second end portion each consist of one division (“first division”) at both ends, and the first boundary portion and the first division. Each of the two boundaries is composed of a second division (“second division”) and a third division (“third division”) adjacent to the first division, and the central portion is from the remaining divisions. You may become.

(3) In the lighting device for plant cultivation according to (2) above, the light power density of at least one of the second category and the third category is the minimum as compared with the light output density of each category. , The light output density of the first section may be the maximum as compared with the light output density of each section.

(4) In the lighting device for plant cultivation according to any one of (1) to (3) above, the illuminance immediately below the first end and the second end is reduced by 20% from the maximum illuminance. It may be within the size.

(5) In the lighting device for plant cultivation according to any one of (1) to (4) above, the minimum light output density may be 0 [mW / mm ² ].

(6) The plant cultivation lighting device according to any one of (1) to (5) above may be provided with a control device for adjusting the light output density.

(7) In the plant cultivation lighting device according to (6) above, either the selection of the point light source to emit light or the amount of current flowing through the point light source may be adjusted by the control device.

(8) In the lighting device for plant cultivation according to any one of (1) to (7) above, the point light source may be a point light source that emits a specific wavelength.

(9) In the lighting device for plant cultivation according to any one of (1) to (8) above, there may be a plurality of the point light source rows.

(10) In the lighting device for plant cultivation according to any one of (1) to (9) above, the point light source is a color mixing element including a red light emitting element, a blue light emitting element, and a red light emitting element and a blue light emitting element. It may be any of the light emitting elements.

(11) In the articulated plant cultivation lighting device according to one aspect of the present invention, the plant cultivation lighting device according to any one of (1) to (10) above is separated and juxtaposed in parallel in the longitudinal direction. It is composed of.

(12) The plant cultivation device according to one aspect of the present invention is described in any one of (1) to (11) above, the distance variable device capable of changing the distance from the point light source array to the irradiation surface. It is equipped with a lighting device for plant cultivation.

According to the lighting device for plant cultivation of the present invention, it is possible to provide a lighting device for plant cultivation in which a decrease in illuminance in a region directly below both ends is suppressed without providing ancillary equipment such as a light diffuser.
According to the connection type lighting device for plant cultivation of the present invention, it is possible to provide a lighting device for plant cultivation in which a decrease in illuminance in a region immediately below both ends is suppressed without providing ancillary equipment such as a light diffuser.

It is a top view which shows typically an example of the lighting apparatus for plant cultivation which concerns on one Embodiment of this invention. It is explanatory drawing which divided the area where a point light source is arranged into a plurality of equally spaced divisions. (A) is a graph showing the illuminance distribution in the case of the point light source arrangement of the present invention and the illuminance distribution in the case of the even arrangement of the point light sources, and (b) is a graph showing the illuminance distribution shown in (a). It is a figure which shows the sectional light output density distribution pattern for demonstrating the point light source arrangement of this invention obtained. (A) is a schematic diagram showing an arrangement pattern of point light sources that realizes the divided light output density distribution pattern shown in FIG. 3 (b) with 25 point light sources N, and FIG. 3 (b) is a conventional schematic diagram. It is a schematic diagram which shows the arrangement pattern of the point light source of uniform arrangement. In the case where the number of point light sources is 25 and the number of divisions is 10, (a) and (b) are the conventional and present point light source arrangements, and (c) and (d) are the illuminance distributions. The simulation result is a divided light output density distribution pattern. In the case where the number of point light sources is 50 and the number of divisions is 10, (a) and (b) are the conventional and present point light source arrangements, and (c) and (d) are the illuminance distributions. The simulation result is a divided light output density distribution pattern. In the case where the number of point light sources is 75 and the number of divisions is 10, (a) and (b) are the conventional and present point light source arrangements, and (c) and (d) are the illuminance distributions. The simulation result is a divided light output density distribution pattern. In the case where the number of point light sources is 100 and the number of divisions is 10, (a) and (b) are the conventional and present point light source arrangements, and (c) and (d) are the illuminance distributions. The simulation result is a divided light output density distribution pattern. In the case where the number of point light sources is 125 and the number of divisions is 10, (a) and (b) are the conventional and present point light source arrangements, and (c) and (d) are the illuminance distributions. The simulation result is a divided light output density distribution pattern. In the case where the number of point light sources is 150 and the number of divisions is 10, (a) and (b) are the conventional and present point light source arrangements, and (c) and (d) are the illuminance distributions. The simulation result is a divided light output density distribution pattern. It shows the simulation result of the illuminance distribution. The number of point light sources is 25 and the number of divisions is 10. (a) has a height of 50 mm, (b) has a height of 100 mm, and (c) has a height. 150 mm, (d) is a case where the height is 200 mm, (e) is a case where the height is 250 mm, and (f) is a case where the height is 300 mm. In the case where the height is common to 200 mm, the number of point light sources is 25, and the number of divisions is 7, (a) and (b) are the conventional and present point light source arrangements, and (c), (D) is a simulation result of the illuminance distribution and a divided light output density distribution pattern. In the case where the height is common to 200 mm, the number of point light sources is 75, and the number of divisions is 7, (a) and (b) are the conventional and present point light source arrangements, and (c), (D) is a simulation result of the illuminance distribution and a divided light output density distribution pattern. In the case where the height is common to 200 mm, the number of point light sources is 150, and the number of divisions is 7, (a) and (b) are the conventional and present point light source arrangements, and (c), (D) is a simulation result of the illuminance distribution and a divided light output density distribution pattern. In the case where the height is common to 200 mm, the number of point light sources is 25, and the number of divisions is 13, (a) and (b) are the conventional and present point light source arrangements, and (c), (D) is a simulation result of the illuminance distribution and a divided light output density distribution pattern. In the case where the height is common to 200 mm, the number of point light sources is 75, and the number of divisions is 13, (a) and (b) are the conventional and present point light source arrangements, and (c), (D) is a simulation result of the illuminance distribution and a divided light output density distribution pattern. In the case where the height is common to 200 mm, the number of point light sources is 150, and the number of divisions is 13, (a) and (b) are the conventional and present point light source arrangements, and (c), (D) is a simulation result of the illuminance distribution and a divided light output density distribution pattern. In the case where the height is common to 200 mm, the number of point light sources is 25, and the number of divisions is 16, (a) and (b) are the conventional and present point light source arrangements, and (c), (D) is a simulation result of the illuminance distribution and a divided light output density distribution pattern. In the case where the height is common to 200 mm, the number of point light sources is 75, and the number of divisions is 16, (a) and (b) are the conventional and present point light source arrangements, and (c), (D) is a simulation result of the illuminance distribution and a divided light output density distribution pattern. In the case where the height is common to 200 mm, the number of point light sources is 150, and the number of divisions is 16, (a) and (b) are the conventional and present point light source arrangements, and (c), (D) is a simulation result of the illuminance distribution and a divided light output density distribution pattern. In the case where the height is common to 200 mm, the number of point light sources is 25, and the number of divisions is 19, (a) and (b) are the conventional and present point light source arrangements, and (c), (D) is a simulation result of the illuminance distribution and a divided light output density distribution pattern. In the case where the height is common to 200 mm, the number of point light sources is 75, and the number of divisions is 19, (a) and (b) are the conventional and present point light source arrangements, and (c), (D) is a simulation result of the illuminance distribution and a divided light output density distribution pattern. In the case where the height is common to 200 mm, the number of point light sources is 150, and the number of divisions is 19, (a) and (b) are the conventional and present point light source arrangements, and (c), (D) is a simulation result of the illuminance distribution and a divided light output density distribution pattern. (A) is a graph showing the result of measuring the illuminance on the irradiation surface at a distance of 200 mm facing the point light source train using the conventional linear illumination device of even arrangement, and (b) is a graph showing the results at both ends. It is a figure which conceptually shows that the light output density of a point light source was increased according to the decrease of illuminance as it approached. (C) is a graph of the illuminance distribution obtained when the distribution of the light output density is set as in (b).

Hereinafter, the lighting device for plant cultivation, which is an embodiment to which the present invention is applied, will be described in detail with reference to the drawings. In the drawings used in the following description, in order to make the features easier to understand, the featured parts may be enlarged for convenience, and the dimensional ratios of each component may not be the same as the actual ones. Absent. Further, the materials, dimensions, etc. exemplified in the following description are examples, and the present invention is not limited thereto, and can be appropriately modified and carried out within the range in which the effect is exhibited.

(Lighting device for plant cultivation)
FIG. 1 shows a plan view schematically showing an example of a lighting device for plant cultivation according to an embodiment of the present invention.
The plant cultivation lighting device 100 shown in FIG. 1 is a plant cultivation lighting device having a point light source row 2 in which a plurality of point light sources (not shown) are arranged in a straight line on the substrate 1. The regions in which a plurality of point light sources are arranged are the first end Le which is one end, the second end Re which is the opposite end of the first end Le, and the first end. A central portion A arranged between Le and the second end portion Re, a first boundary portion Lb arranged between the first end portion Le and the central portion A, and a second end portion Re and the central portion A. It consists of a second boundary portion Rb arranged between them, and the light output densities of the first end portion Le and the second end portion Re are the maximum, and the light output densities are the minimum at the first boundary portion Lb and the second boundary portion Rb. There is a region, and a plurality of point light sources are arranged so that the light output density of the central portion A is equal to or higher than the minimum light output density and lower than the maximum light output density.
Here, in the present invention, the "point light source" means a light source for a surface light source or a line light source, and for example, a minute light emitting element such as an LED chip or a small lamp is used. The number of light emitting elements does not have to be one, and may be composed of a plurality of light emitting elements. For example, a plurality of LED chips such as red, green, and blue may be integrally sealed. An example of the size of the "point light source" is about 0.25 mm × 0.25 mm to 1 mm × 1 mm.
Further, in the present invention, the "light output density" is the light emission output (W) per unit area.

As the material of the substrate 1, a material generally used as a substrate of a lighting device can be used. For example, a paper phenol substrate, a paper epoxy substrate, a glass epoxy substrate, or the like can be used.

In the lighting device for plant cultivation of the present invention, as a configuration showing the magnitude relationship of the light output density as described above, for example, (a) a point of the light output density having a magnitude relationship as defined by the point light sources arranged in each part. It may be configured as a light source, or (b) all point light sources have the same light output density, and have a magnitude relationship of light output densities as defined by the difference in the arrangement density of the point light sources in each part. It may be a configuration, or it may indicate a magnitude relationship as defined by a configuration in which (c), (a) and (b) are combined.

In the lighting device for plant cultivation of the present invention, the light output densities of the plurality of point light sources constituting the point light source sequence are equal (corresponding to the configuration of (b) above), and the plurality of point light sources are the following (i) and (Ii) may be arranged so as to satisfy both of them; (i) The average number density (density per unit length) of the point light source is 2.6 pieces / 100 mm to 26 pieces / 100 mm, and (ii). ) When the area where the point light source is arranged is divided into a plurality of equally spaced divisions having a width of 30 mm to 85 mm, the first end portion and the second end portion are each divided into one division at both ends (“first division”). The first boundary and the second boundary are composed of a second division (“second division”) and a third division (“third division”) adjacent to the first division, respectively, and the central portion. Consists of the remaining divisions.
In the present invention, "there is a minimum region of light output density in the first boundary portion and the second boundary portion" means that, in the case of this configuration, the second division and the second boundary portion constituting the first boundary portion and the second boundary portion, respectively. It means that one of the three categories is the smallest of all the categories. Here, "one of the second and third categories is the smallest of all categories" means that any of the second and third categories is "among all categories." It is not necessary to be the only "minimum", and there may be a division having the same light power density as the "minimum" light output density in the division constituting the central portion. This is because, in the characteristic light power density distribution of the present invention, the light power density of both ends (first end and second end) and the adjacent boundary (first boundary and second boundary) is It is important and it is necessary to meet the predetermined requirements, but the light output density in the central portion is not essential for the purpose of suppressing the decrease in illuminance in the region immediately below both ends.

This configuration will be described with reference to FIG.
In the lighting device for plant cultivation shown in FIG. 2, in order to clearly explain that the area where the point light source is arranged is divided into a plurality of equally spaced divisions, the substrate 1 is provided with scales at equal intervals.
The lighting device for plant cultivation shown in FIG. 2 is an example in which the area where the point light source is arranged is divided into 18 sections.
In the example shown in FIG. 2, the first end portion L1 and the second end portion R1, which are the left and right end portions, correspond to the first division.
Further, the second division (second division) adjacent to each of the first end portion L1 and the second end portion R1, which is the first division, is a division indicated by reference numeral L2 and a division indicated by reference numeral R2. .. Further, the third division adjacent to the central portion side of the second division (L2, R2) is a division indicated by reference numeral L3 and a division indicated by reference numeral R3. Then, the second division L2 and the third division L3, the second division R2 and the third division R3 form the first boundary portion and the second boundary portion, respectively.
Further, the remaining divisions L4 to L9 and divisions R4 to R9 form a central portion.

In this configuration, the point light sources in each category are installed in a range in which the average number density is 2.6 pieces / 100 mm or more and 26 pieces / 100 mm or less.

FIG. 3A shows the illuminance of the actual linear illuminating device (Example) in which the same light source as the point light source used to obtain the data shown in FIG. 24 is used and the point light source arrangement pattern of the present invention is used. The distribution (thick solid line), the illuminance distribution (dotted line) of the simulation model (example), and the illuminance distribution (thin) in the case of the even arrangement of the point light sources shown in FIG. 24 (a) (equally spaced arrangement (comparative example)). The solid line) graph is shown.
From the comparison with the illuminance distribution due to the even arrangement of the point light sources shown in FIG. 24 (a), it can be seen that the decrease in illuminance at the end portion is significantly suppressed in the case of the point light source arrangement of the present invention. In addition, the validity of the result of the illuminance distribution by the point light source arrangement of the present invention based on the actual product can be confirmed from the comparison with the illuminance distribution by the simulation model.
As shown in FIG. 24 (a), since the actual product with the same settings and the simulation model obtained almost the same results regarding the illuminance distribution, the simulation results by the above lighting design analysis software are valid. Gender is guaranteed.

In the actual product and the simulation model with the point light source arrangement of the present invention, the light output density distribution (in this case, the point light source arrangement pattern) set to obtain the illuminance distribution shown in FIG. 3 (a) is shown in FIG. 3 (b). ). In FIG. 3B, the region where the point light source is arranged is divided into a plurality of equally spaced divisions and replaced with the light output density distribution of the divisions.

In FIG. 3B, one half of the area where the point light source is arranged is divided into 10 sections (the length of each section is 58 mm), and the light output density in each section is set to 1 with the total light output density as 1. The ratio is shown on the vertical axis. Similar to FIG. 24, the horizontal axis is the coordinates indicating the position of the linear illuminator, and X = 0 is the position of the center of the linear illuminator.
In FIG. 3B, of the two bar data in each category, the bar data on the right side shows the actual actual data (example), and the bar data on the left side shows the data of the simulation model (example). ..
In FIG. 3B, the pattern of the bar data on the left side is a point light source arrangement pattern obtained by obtaining the actual actual data shown in FIG. 3A, and 10 points on one side half of the area where the point light source is arranged. (The length of each division is 58 mm), and the light output density distribution pattern of the division (hereinafter, may be referred to as "division light output density distribution pattern") is replaced.
In FIG. 3B, the reference numeral Re corresponds to the second end portion, and the reference numeral Rb corresponds to the second boundary portion. The light output density is the maximum at the second end portion, and the light output density is the minimum in the second division constituting the second boundary portion.
The illuminance distribution obtained in the configuration of this divided light output density distribution pattern is shown in FIG. 3 (a).

FIG. 4A shows an arrangement pattern of point light sources (implementation) in which the divided light output density distribution pattern shown in FIG. 3B is realized, with 25 point light sources N in one half (that is, 580 mm) of 1160 mm. It is a schematic diagram which shows an example). The diamond-shaped mark indicates one point light source. In this case, the size of the "region in which the point light source is arranged" in the present invention is 1160 mm.
The plurality of point light sources are densely packed in the vicinity of 580 mm. The positions of the densely packed point light sources do not completely coincide with each other, but they are distributed with a slight deviation. Since the magnitude of this deviation is sufficiently smaller than the entire arrangement region of the point light sources, in FIG. 4A, it appears that the dense point light sources overlap each other. This situation is the same in the figure shown below.
For reference, FIG. 4B shows a schematic diagram showing a conventional even arrangement (comparative example) point light source arrangement pattern.

For the simulation here, the same software as the lighting design analysis software for obtaining the illuminance distribution in FIGS. 3 (a) and 24 (a) is used. The same shall apply below.
In the simulation model, the substrate on which the point light sources are arranged is made of acrylic, the point light sources are arranged in a row in the longitudinal direction of the substrate, the LED chips including the light emitting part are used, and the light distribution of the light output is Lambersian. The distance between the end point light sources was 1160 mm.
The distance L between the point light sources at both ends is 1160 mm, the minimum distance between the point light sources is more than 0 mm, and the irradiation surface perpendicular to the output direction of the point light source array is arranged so as to face the point light source array, and the length of the irradiation surface. Was the same as L, the initial arrangement was made uniform, and the arrangement of the point light sources was set so as to eliminate the uneven illumination in the output direction of the point light source train obtained on the irradiation surface.

FIGS. 5 and 6 are simulations similar to the results shown in FIGS. 3 and 4. In FIG. 5, the number of point light sources in one half (that is, 580 mm) of 1160 mm is 25 (corresponding to the average number density of 4.3 points / 100 mm of point light sources) and 10 divisions (corresponding to the width of each division of 58 mm). ), And FIG. 6 shows the results when the number of point light sources is 50 (corresponding to the average number density of 8.6 point light sources / 100 mm) and the number of divisions is 10 (corresponding to the width of each division of 58 mm). Is shown.
In each of FIGS. 5 and 6, the schematic diagram of (a) and (b) is the same schematic diagram as the schematic diagram showing the arrangement pattern of the point light source shown in FIG. 4, and the schematic diagram of (a) is the present. It is the one of the invention (Example), and the schematic diagram of (b) is the conventional one with even arrangement (Comparative Example). The same applies to FIGS. 7 to 10.
Further, the two graphs (c) and (d) are the same as the graphs shown in FIGS. 3 (a) and 3 (b), respectively. In the graph of the illuminance distribution, the solid line graph shows the illuminance distribution (comparative example) of the conventional evenly arranged one, and the dotted line graph shows the divided light output density distribution pattern (in the case of the present invention) shown in the graph below. It shows the illuminance distribution (Example) of. The same applies to FIGS. 7 to 10.

The results shown in FIGS. 5 and 6 are the results of one half, but the same results can be obtained for the other half.
From FIGS. 5 and 6, when the number of point light sources is 25 (corresponding to the average number density of point light sources 4.3 / 100 mm) and the number of divisions is 10 (corresponding to the width of each division 58 mm), and the point light sources. When the number is 50 (corresponding to the average number density of point light sources 8.6 / 100 mm) and the number of divisions is 10 (corresponding to the width of each division 58 mm), the first end and the second end are respectively. The light output density of the first division constituting the above is the maximum, and the light output density of the second division is the smallest among the second division and the third division constituting the first boundary portion and the second boundary portion, respectively. By using a point light source arrangement pattern such that the light output density in the central portion is equal to or higher than the minimum light output density and less than the maximum light output density, the illuminance in the region directly below both ends is set. It can be seen that the decrease is suppressed.

In FIG. 7, the number of point light sources in one half (that is, 580 mm) of 1160 mm is 75 (corresponding to the average number density of 12.9 points / 100 mm of point light sources) and 10 divisions (corresponding to the width of each division of 58 mm). ), And FIG. 8 shows the results when the number of point light sources is 100 (corresponding to the average number density of 17.2 point light sources / 100 mm) and the number of divisions is 10 (corresponding to the width of each division of 58 mm). Is shown.

From FIG. 7, when the number of point light sources is 75 (corresponding to the average number density of 12.9 point light sources / 100 mm) and the number of divisions is 10 (corresponding to the width of each division of 58 mm), the first end portion and The light output density of the first division that constitutes each of the second end portions is the maximum, and the third division among the second division and the third division that constitute each of the first boundary portion and the second boundary portion. By making the point light source arrangement pattern such that the light output density of the above is the minimum and the light output density of the central part is equal to or more than the minimum light output density and less than the maximum light output density, both ends are It can be seen that the decrease in illuminance in the area directly below is suppressed.
From FIG. 8, when the number of point light sources is 100 (corresponding to the average number density of 17.2 point light sources / 100 mm) and the number of divisions is 10 (corresponding to the width of each division of 58 mm), the first end portion and The second division of the second and third divisions that have the maximum light output density of the first division that constitutes each of the second end portions and that constitute each of the first boundary portion and the second boundary portion. By making the point light source arrangement pattern such that the light output density of the above is the minimum and the light output density of the central part is equal to or more than the minimum light output density and less than the maximum light output density, both ends are It can be seen that the decrease in illuminance in the area directly below is suppressed.

In FIG. 9, the number of point light sources in one half of 1160 mm (that is, 580 mm) is 125 (corresponding to the average number density of point light sources 21.6 / 100 mm) and 10 divisions (corresponding to the width of each division 58 mm). ), And FIG. 10 shows the results when the number of point light sources is 150 (corresponding to the average number density of 25.9 point light sources / 100 mm) and the number of divisions is 10 (corresponding to the width of each division of 58 mm). Is shown.

From FIGS. 9 and 10, when the number of point light sources is 125 (corresponding to the average number density of point light sources 21.6 / 100 mm) and the number of divisions is 10 (corresponding to the width of each division 58 mm), and the point light sources. When the number of point light sources is 150 (corresponding to the average number density of point light sources 25.9 / 100 mm) and the number of divisions is 10 (corresponding to the width of each division 58 mm), the first end and the second The light output density of the first division that constitutes each of the end portions is the maximum, and the light of the second division among the second division and the third division that constitute each of the first boundary portion and the second boundary portion. By using a point light source arrangement pattern in which the output density is the minimum and the light output density in the central portion is equal to or higher than the minimum light output density and less than the maximum light output density, the light output density is directly below both ends. It can be seen that the decrease in illuminance in the region is suppressed.

Next, the effect of the distance (height) h from the point light source array to the irradiation surface on the irradiation distribution was examined.
FIG. 11 shows a linear lighting device in which 25 point light sources are arranged in one half (that is, 580 mm) of 1160 mm (“the area where the point light sources are arranged” is 1160 mm), and the number of divisions is large. In the case of 10 pieces (corresponding to the width of 58 mm in each section) (corresponding to the case of FIG. 5), the distance (height) h is (a) 50 mm, (b) 100 mm, (c) 150 mm, (d). The illuminance distribution when 200 mm, (e) 250 mm, and (f) 300 mm are shown. When (d) is 200 mm, the result is the same as that shown in FIG.

In any of the heights shown in FIGS. 11A to 11F, the effect of suppressing the decrease in illuminance in the region immediately below both ends is exhibited.
The ratio of the fluctuation range of the illuminance at X = 0 to 580 is 23%, 13%, 8%, 11%, 19%, 22% in the order of (a) to (f), and the ratio of the fluctuation range is the lowest. Is the case of h = 150 mm, h = 200 mm, h = 100 mm, h = 250 mm, h = 300 mm, h = 50 mm. Further, in the case of (a) 50 mm, (b) 100 mm, and (c) 150 mm, the illuminance once increases from the boundary portion to the end portion before the illuminance decreases at the end portion, and the degree of the fluctuation is The smaller the distance (height) h, the larger the illuminance, whereas in the case of (d) 200 mm, (e) 250 mm, and (f) 300 mm, the illuminance increases from the boundary to the end. There is no.
Based on the examination of the above effects, the distance (height) h is preferably 100 mm to 250 mm, more preferably 150 mm to 250 mm.

Next, the effect of the size (length) of the division that divides the area where the point light source is arranged into equal intervals on the irradiation distribution was examined. In the linear lighting device of the present invention, the light output density is the maximum in the first division which is the end portion, and the light output density is the minimum in the second division and the third division which are the boundary portions adjacent to the end portion. However, in the present invention, the size of the division is a factor related to the position where the maximum and minimum of the light output density exist in the linear illuminating device.

In FIGS. 12 to 14, the distance (height) h is common to 200 mm. In FIG. 12, the number of point light sources N on one side of 1160 mm (that is, 580 mm) is 25, the number of divisions n is 7 (corresponding to the width of each division of 83 mm), and in FIG. 13, the number of point light sources N of 580 mm is 75. The number of divisions n is 7 (corresponding to the width of each division of 83 mm), and in FIG. 14, the number of point light sources N of 580 mm is 150 and the number of divisions n is 7 (corresponding to the width of each division of 83 mm). The schematic diagram and the result similar to those in FIGS. 5 and 6 are shown.

In the configuration of FIG. 12, the light output density of the first division that constitutes each of the first end portion and the second end portion is the maximum, and the second boundary portion and the second boundary portion that form each of the second boundary portion are formed. Of the categories and the third category, the point that the light output density of the third category is the minimum, and the light output density of the central portion is equal to or higher than the minimum light output density and less than the maximum light output density. It can be seen that the light source arrangement pattern suppresses the decrease in illuminance in the region directly below both ends. In this configuration, the light output density of the two adjacent sections (central portion) of the third section is also the minimum together with the light output density of the third section.

In the configurations of FIGS. 13 and 14, the light output density of the first division constituting each of the first end portion and the second end portion is the maximum, and each of the first boundary portion and the second boundary portion is configured. Of the second and third categories, the light output density of the second category is the minimum, and the light output density of the central portion is equal to or higher than the minimum light output density and less than the maximum light output density. It can be seen that the decrease in illuminance in the region directly below both ends is suppressed by using the point light source arrangement pattern.

In FIGS. 15 to 17, the distance (height) h is the same as 200 mm. In FIG. 15, the number of point light sources N on one side of 1160 mm (that is, 580 mm) is 25, the number of divisions n is 13 (corresponding to the width of each division of 45 mm), and in FIG. 16, the number of point light sources N of 580 mm is 75. The number of divisions n is 13 (corresponding to the width of 45 mm of each division), and in FIG. 17, the number of point light sources N of 580 mm is 150 and the number of divisions n is 13 (corresponding to the width of 45 mm of each division). The schematic diagram and the result similar to those in FIGS. 5 and 6 are shown.

In the configuration of FIG. 15, the light output density of the first division that constitutes each of the first end portion and the second end portion is the maximum, and the second boundary portion and the second boundary portion that form each of the second boundary portion are formed. A point light source arrangement pattern in which the light output densities of both the division and the third division are the minimum, and the light output density in the central portion is equal to or higher than the minimum light output density and lower than the maximum light output density. By doing so, it can be seen that the decrease in illuminance in the region immediately below both ends is suppressed. In this configuration, the light output densities of the three adjacent divisions (central portion) of the third division are also the minimum together with the light output densities of the second division and the third division.

In the configurations of FIGS. 16 and 17, the light output density of the first section constituting each of the first end portion and the second end portion is the maximum, and each of the first boundary portion and the second boundary portion is configured. Of the second and third categories, the light output density of the second category is the minimum, and the light output density of the central portion is equal to or higher than the minimum light output density and less than the maximum light output density. It can be seen that the decrease in illuminance in the region directly below both ends is suppressed by using the point light source arrangement pattern. In the configuration of FIG. 16, the light output density of the two adjacent sections (central portion) of the second section is also the minimum together with the light output density of the second section.

In FIGS. 18 to 20, the distance (height) h is the same as 200 mm. In FIG. 18, the number of point light sources N on one side of 1160 mm (that is, 580 mm) is 25, the number of divisions n is 16 (corresponding to the width of each division of 36 mm), and in FIG. 19, the number of point light sources N of 580 mm is 75. The number of divisions n is 16 (corresponding to the width of 36 mm of each division), and in FIG. 20, the number of point light sources N of 580 mm is 150 and the number of divisions n is 16 (corresponding to the width of 36 mm of each division). The schematic diagram and the result similar to those in FIGS. 5 and 6 are shown.

In the configuration of FIG. 18, the light output density of the first division that constitutes each of the first end portion and the second end portion is the maximum, and the second boundary portion and the second boundary portion that form each of the second boundary portion are formed. A point light source arrangement pattern in which the light output densities of both the division and the third division are the minimum, and the light output density in the central portion is equal to or higher than the minimum light output density and lower than the maximum light output density. By doing so, it can be seen that the decrease in illuminance in the region immediately below both ends is suppressed. In this configuration, the light output density of the division (central portion) adjacent to the third division is also the minimum together with the light output densities of the second division and the third division.

In the configurations of FIGS. 19 and 20, the light output density of the first division constituting each of the first end portion and the second end portion is the maximum, and each of the first boundary portion and the second boundary portion is configured. Of the second and third categories, the light output density of the third category is the minimum, and the light output density of the central portion is equal to or higher than the minimum light output density and less than the maximum light output density. It can be seen that the decrease in illuminance in the region directly below both ends is suppressed by using the point light source arrangement pattern.

In FIGS. 21 to 23, the distance (height) h is common to 200 mm. In FIG. 21, the number of point light sources N on one side of 1160 mm (that is, 580 mm) is 25, the number of divisions n is 19 (corresponding to the width of each division of 31 mm), and in FIG. 22, the number of point light sources N of 580 mm is 75. The number of divisions n is 19 (corresponding to the width of each division of 31 mm), and in FIG. 23, the number of point light sources N of 580 mm is 150 and the number of divisions n is 19 (corresponding to the width of each division of 31 mm). The schematic diagram and the result similar to those in FIGS. 5 and 6 are shown.

In the configuration of FIG. 21, the light output density of the first division that constitutes each of the first end portion and the second end portion is the maximum, and the second boundary portion and the second boundary portion that form each of the second boundary portion are formed. Of the categories and the third category, the point that the light output density of the third category is the minimum, and the light output density of the central portion is equal to or higher than the minimum light output density and less than the maximum light output density. It can be seen that the light source arrangement pattern suppresses the decrease in illuminance in the region directly below both ends. In this configuration, the light output density of the section adjacent to the third section (central portion) is also the minimum together with the light output density of the third section.

In the configurations of FIGS. 22 and 23, the light output density of the first division constituting each of the first end portion and the second end portion is the maximum, and each of the first boundary portion and the second boundary portion is configured. Of the second and third categories, the light output density of the second category is the minimum, and the light output density of the central portion is equal to or higher than the minimum light output density and less than the maximum light output density. It can be seen that the decrease in illuminance in the region directly below both ends is suppressed by using the point light source arrangement pattern.

In the lighting device for plant cultivation of the present invention, it is preferable that the illuminance immediately below the first end portion and the second end portion has a magnitude of 20% or less reduction from the maximum illuminance.
Examples corresponding to this are FIGS. 5 and 6, FIGS. 7 and 8, FIGS. 9 and 10, FIGS. 11 (b) to 11 (e), FIGS. 12 to 14, 15 to 17, 18 to 20, and 21. The configurations showing the results in ~ 23 are listed.
In the lighting device for plant cultivation of the present invention, it is more preferable that the illuminance immediately below the first end portion and the second end portion has a magnitude of a decrease of 15% or less from the maximum illuminance.
Examples of cases corresponding to this include the configurations shown in the above except for FIG. 11 (e).

In the lighting device for plant cultivation of the present invention, the minimum light output density may be 0 [mW / mm ² ].
In this case, there is a cost merit because it is not necessary to use a point light source in the division.

The lighting device for plant cultivation of the present invention preferably includes a control device for adjusting the light output density.
The light output density may be adjusted by this control device by either selecting a point light source to emit light or by the amount of current flowing through the point light source.
In the lighting device for plant cultivation of the present invention, the same or different point light sources may be evenly arranged, and the point light sources to actually emit light may be selected by the control device to obtain a predetermined light output density.

The lighting device for plant cultivation of the present invention may be a point light source that emits a specific wavelength, and is preferably a point light source that emits a wavelength suitable for plant cultivation.
For example, the point light source may be any one of a red light emitting element that emits red light, a blue light emitting element that emits blue light, and a mixed color light emitting element equipped with a red light emitting element and a blue light emitting element. In the case of this configuration, a plant cultivation method ("Shigyo Method" (for example, "Shigyo Method") including a step of irradiating a plant with red light and a procedure of irradiating a plant with blue light separately and independently within a certain period of time. , Patent Document 4)).

As the red light emitting element, an element that emits light having a wavelength range of 570 to 730 nm, preferably light having a central wavelength in the range of 635 to 660 nm is used. Further, as the blue light emitting element, light having a wavelength range of 400 to 515 nm, preferably light having a center wavelength of 450 nm is used. As such a red light emitting element, for example, a light emitting diode (aluminum, gallium, indium, phosphorus-based light emitting diode, etc.) manufactured by Showa Denko Co., Ltd. and having a product number of HRP-350F can be used, as described above. As the blue light emitting element, for example, a light emitting diode manufactured by Showa Denko Co., Ltd. and having a product number of GM2LR450G can be used.

When the enforcement method is used, a switching circuit that selects which light emitting element drive circuit is to be driven in order to perform the red light irradiation procedure and the blue light irradiation procedure independently within a certain period of time, and It is necessary to attach a timer circuit that controls the timing of this selection in time. The selection operation by the switching circuit is performed based on the current supply time to the red light emitting element and the current supply time to the blue light emitting element set and held (stored) in the one-chip microcomputer constituting the timer circuit.

As an input unit when the enforcement method is used, a slide switch can be applied when an analog signal conversion switch using a variable resistor is used. Further, when performing digital input, the input unit may be configured by a push button or the like. Alternatively, the input unit may be capable of inputting the current supply time and the current value using an infrared remote controller as an infrared light receiving unit. Also in the present invention, by setting a desired current supply time and current value in the one-chip microcomputer constituting the timer circuit by the input unit, the switching circuit is made to execute the above-mentioned control pattern, and the plant is cultivated by the execution method. It is possible to do.

If necessary, it is preferable to provide a display unit for confirming the current supply time and the set value of the current value. The display unit may be an analog or digital clock, an LED indicator, or the like. The current supply time and current value of the red light emitting element or the blue light emitting element can be set by wiring a control line to each light emitting element and collectively controlling the switching circuits of a plurality of light emitting elements by wire or wirelessly. It is possible.

In the above description, the case where there is one point light source sequence has been described, but as long as the effect of the present invention is obtained, there may be a plurality of point light source sequences. In this case, it is preferable that the adjacent point light source rows are close to each other within a range that does not interfere with each other, but in reality, the size of the small lamps is separated.
Therefore, the plant cultivation lighting device of the present invention is a plant cultivation lighting device having one or a plurality of point light source rows in which point light sources are linearly arranged.

The point light source included in the lighting device for plant cultivation of the present invention is not limited to being composed of one light emitting element, and may be composed of a plurality of light emitting elements as long as the effect of the present invention is exhibited.

(Lighting device for connected plant cultivation)
The articulated plant cultivation lighting device of the present invention is configured by arranging the above-mentioned plant cultivation lighting devices of the present invention in parallel in the longitudinal direction with the distance from each other.

(Plant cultivation equipment)
The plant cultivation device of the present invention includes a distance variable device capable of changing the distance from the point light source array to the irradiation surface, and the above-mentioned lighting device for plant cultivation of the present invention.

1 Substrate 2-point light source row 100 Plant cultivation lighting device Le 1st end Re 2nd end Lb 1st boundary Rb 2nd boundary A Central

Claims (12)

A lighting device for plant cultivation having a row of point light sources in which a plurality of point light sources are arranged in a straight line on a substrate.
The region in which the plurality of point light sources are arranged on the substrate includes a first end portion which is one end portion, a second end portion which is an end portion opposite to the first end portion, and the first end portion. A central portion arranged between the portion and the second end portion, a first boundary portion arranged between the first end portion and the central portion, and a central portion arranged between the second end portion and the central portion. Consists of a second boundary
The light output densities of the first end and the second end are maximum.
There is a minimum region of light output density at the first boundary portion and the second boundary portion.
The plurality of point light sources are arranged so that the light output density in the central portion is equal to or higher than the minimum light output density and lower than the maximum light output density .
In the direction in which the point light sources are arranged, the length of the first end and the second end, the center from one side total length der Ru plant cultivation lighting device 1 following 10 minutes of each said substrate. The plant cultivation according to claim 1, wherein the light output densities of the plurality of point light sources constituting the point light source sequence are equal, and the plurality of point light sources are arranged so as to satisfy both (i) and (ii) below. Lighting device;
(I) The average number density of point light sources is 2.6 / 100 mm to 26/100 mm.
(Ii) When the area where the point light source is arranged is divided into a plurality of equally spaced divisions having a width of 30 mm to 85 mm, the first end portion and the second end portion are each divided into one division at both ends (“the first”. 1 division "), and the first boundary portion and the second boundary portion are the second division ("second division") and the third division ("third division") adjacent to the first division, respectively. The central part consists of the remaining divisions. The light power density of at least one of the second division and the third division is the minimum as compared with the light output density of each division, and the light output density of the first division becomes the light output density of each division. The lighting device for plant cultivation according to claim 2, which is the largest in comparison. The illuminance immediately below the first end and second end, Ri magnitude der reduction is within 20% of the maximum illuminance
The illuminance is, for plant cultivation lighting device according to any one of the point light source der those obtained Ru claim at a location a distance of 100mm or more 250mm or less from the column 1-3. The lighting device for plant cultivation according to any one of claims 1 to 4, wherein the minimum light output density is 0 [mW / mm ² ]. The lighting device for plant cultivation according to any one of claims 1 to 5, further comprising a control device for adjusting the light output density. The lighting device for plant cultivation according to claim 6, wherein the control device adjusts either the selection of a point light source to emit light or the amount of current flowing through the point light source. The lighting device for plant cultivation according to any one of claims 1 to 7, wherein the point light source is a point light source that emits a specific wavelength. The lighting device for plant cultivation according to any one of claims 1 to 8, wherein the point light source sequence is plurality. The lighting device for plant cultivation according to any one of claims 1 to 9, wherein the point light source is any one of a red light emitting element, a blue light emitting element, and a red light emitting element and a mixed color light emitting element equipped with the blue light emitting element. A connected plant cultivation lighting device configured by arranging the plant cultivation lighting devices according to any one of claims 1 to 10 in parallel in the longitudinal direction with the plant cultivation lighting devices separated from each other. A plant cultivation device including a distance variable device capable of changing the distance from the point light source array to the irradiation surface and a plant cultivation lighting device according to any one of claims 1 to 11.

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