JP2019068797A - Hybrid lighting unit for plants - Google Patents

Abstract

To provide a hybrid lighting unit for plants in which a light source for inhibiting the disease damaging to plants and a light source for promoting the growth of plants are used and which can maximumly effectively utilize the light irradiated from these light sources to the plants.SOLUTION: The hybrid lighting unit for plants of the present invention comprises: fluorescent tubes 10a and 10b for irradiating UV-B light; LED light sources 20a, 20b, 20c disposed in a line with the fluorescent tubes 10a, 10b and not including the wavelength of the UV-B region and having light of 400 nm or more as the main wavelength; and a reflecting plate 30 covering the fluorescent tubes 10a and 10b and the LED light sources 20a, 20b and 20c by the turnaround of the peripheral edge to the light source in the direction where the fluorescent tubes 10a and 10b that are the first light source and the LED light sources 20a, 20b and 20c that are the second light source are disposed in a line.SELECTED DRAWING: Figure 1

Description

  The present invention relates to plant lighting technology, and more particularly to a plant hybrid lighting unit for controlling plant diseases and additionally promoting plant growth mechanisms.

  In developed countries such as the Netherlands and Japan, development is progressing to dramatically improve crop production efficiency by combining electronics with conventional agriculture. For example, a system for controlling this pest using light having a wavelength range effective for plant growth has been proposed.

  For example, in patent document 1, in order to form a uniform illumination surface as a whole with respect to the cultivation surface of a plant, a support for cultivating a plant, a plurality of irradiation sources for irradiating visible light / ultraviolet light, and infrared rays. A lighting device having a plurality of infrared irradiators for irradiating a plant has been proposed. According to this patent document 1, the plurality of infrared irradiators have cylindrical heat dissipating tubes each having a heat dissipating tube length in the range of 50 mm to 500 mm, and are further reflected individually on the top surface of the heat dissipating tube. There is disclosed a structure in which the container is disposed.

  Moreover, in patent document 2, in order to provide the illumination method which can divide a human's work area | region and the pollination area | region of the insects for pollination in cultivating an insectivorous plant, a plant of several types of light from which a wavelength mutually differs is planted. A lighting device for emitting light has been proposed. More specifically, in the insectivorous plant cultivation facility, the pollination region of the pollination insect is irradiated with light including light within the wavelength range of 300 nm to 400 nm and light within the wavelength range of 400 to 700 nm, There is disclosed a configuration in which the working region of the worker does not include light within the wavelength range of 300 to 500 nm but emits light including light within the wavelength range of more than 500 nm to 700 nm or less.

  For example, in Patent Document 1, the structure is somewhat complicated in that reflectors are individually provided on the upper surface of the heat radiation pipe. On the other hand, providing a common reflector for a plurality of light sources, which is not a plant-use lighting device, is a known technique in the field of home lighting (see, for example, Patent Document 3).

Japanese Patent Application Publication No. 2016-507220 JP, 2016-002027, A Japanese Patent Application Laid-Open No. 07-28059

  However, although the prior art described in the above-mentioned patent documents utilizes a plurality of light sources different in wavelength to promote plant growth promotion, it can be said that there is still room for improvement in at least the following points.

  That is, in a plant factory etc., plants are generally planted at relatively high density, and in many cases the artificial light source is irradiated close to the plants, for example, as mentioned in Patent Document 1 The light from the light source must be efficiently diffused to the surroundings. Certainly, according to Patent Document 1, the irradiation by the infrared irradiator seems to be able to be homogenized, but the light source irradiating visible light and / or ultraviolet light is only simply irradiating downward and the effect from both light sources is effective Has the problem that it is not always possible to

  Moreover, in patent document 2, in order to attract an insect, ultraviolet light is utilized and it is not what is intended to suppress a disease from the beginning, and it is not compatible with the growth promotion of a plant, and a disease control. Further, Patent Document 2 does not disclose the point of efficiently diffusing light using a reflector, and it can not but be said that efficient light irradiation has a large problem.

  On the other hand, Patent Document 3 is not originally intended for use in plants, and there is no recognition of the problem when arranging multiple types of light sources different in wavelength from each other, in order to utilize multiple sources of light different in wavelength for plant applications. It can not be applied as it is.

  The present invention has been made in view of an example to solve such problems, and uses a light source for controlling a disease that causes harm to a plant and a light source for promoting the growth of a plant. It is an object of the present invention to provide a hybrid lighting unit for plants capable of making the best use of the light emitted to the plants from these light sources.

  In order to solve the above-mentioned subject, a hybrid lighting unit for plants concerning one embodiment of the present invention is arranged side by side with the 1st light source which irradiates (1) UV-B light, and the 1st light source, A second light source having a main wavelength of 400 nm or more and not including the wavelength of the B region, and the peripheral edge in the direction in which the first light source and the second light source are aligned is folded back to the light source side And (2) a reflector which covers simultaneously with the light source.

  In the hybrid lighting unit for plants according to (1) described above, (2) the reflection plate does not directly irradiate the second light source with UV-B light emitted from the first light source. Preferably, a shielding portion is provided between the first light source and the second light source.

In the hybrid lighting unit for plants according to (2) described above, (3) the shielding portion does not interfere with the light emitted along the directivity of the light emitted from the second light source. It is preferable that the first light source is inclined toward the first light source.
Moreover, in the hybrid lighting unit for plants according to (2) or (3) described above, (4) the shielding portion faces the second light source and the inclination degree of the slope facing the first light source. It is preferable that the slopes of the slopes are different from one another.

Moreover, in the hybrid lighting unit for plants according to any one of (1) to (4) described above, (5) the reflecting plate is a first installation surface on which the first light source is installed; It is preferable to have a second installation surface on which the second light source is installed so as to be behind the first installation surface with respect to the irradiation direction of the light source.
Furthermore, in the hybrid lighting unit for plants according to any one of (1) to (5) described above, (6) the UV-B intensity of the reference cultivation surface installed immediately below the first light source and the second light source Is preferably 3 to ²⁰ μW / cm ² .
In the hybrid lighting unit for plants according to any one of (1) to (6) described above, the blue wavelength is 400 to 499 nm, the green wavelength is 500 to 599 nm, the red wavelength is 600 to 699 nm, and the far red wavelength is When the wavelength is 700 to 780 nm, the peak of each wavelength is (7) 430 nm to 450 nm, the peak of the blue wavelength is 535 nm to 555 nm, the peak of the green wavelength is 640 nm to 670 nm, It is preferable to have a peak of the far-red wavelength at 700 nm to 750 nm.

  According to the present invention, since the first light source emitting UV-B light and the second light source not containing the wavelength of the UV-B region and mainly containing the light of 400 nm or more are covered by the common reflector. Portability and installation can be improved while using a simple structure. Furthermore, since the light from the first light source and the light from the second light source are respectively reflected by the reflection plate, it is possible to efficiently irradiate the plant with light necessary for growing the plant.

It is a perspective view which shows typically the appearance of hybrid lighting unit 100 for plants concerning a 1st embodiment. It is an example of the measurement result which showed the irradiation characteristic (directivity of light) in the 1st light source 10 of this embodiment, and the 2nd light source 20, respectively. It is a whole schematic diagram which shows the structure of the hybrid lighting unit 200 for plants which concerns on 2nd Embodiment by a cross section. It is a whole schematic diagram which shows the structure of the hybrid lighting unit 300 for plants which concerns on 3rd Embodiment by a cross section. It is a whole schematic diagram which shows the structure of the hybrid lighting unit 400 for plants which concerns on 4th Embodiment by a cross section. It is a whole schematic diagram which shows the structure of the hybrid lighting unit 500 for plants which concerns on 5th Embodiment by a cross section. It is a whole schematic diagram which each shows the structure of the hybrid lighting unit 600 for plants which concerns on a modification, and the hybrid lighting unit 700 for plants in a cross section. It is a schematic diagram explaining the arrangement configuration in the confirmation test of growth promotion of a plant, and disease control using the hybrid lighting unit for plants.

  Hereinafter, an embodiment for carrying out the present invention will be described. In each of the drawings, the direction in which the fluorescent tube 10 and the LED light source 20 of the hybrid lighting unit 100 for plants are arranged in the X direction, the direction in which the fluorescent tube 10 housed in the housing 40 extends in the Y direction, The front orthogonal to the Y direction and irradiated with light from these light sources is conveniently defined as the + Z direction. However, these orientations are for clearly explaining the structure of the hybrid lighting unit 100 for plants, and do not limit the technical scope of the present invention.

First Embodiment
<Plant hybrid lighting unit 100>
The plant hybrid illumination unit 100 according to the first embodiment will be described with reference to FIGS. 1 and 2.
In addition, as a plant suitable by this embodiment, fruit vegetables, such as a tomato, eggplant, a cucumber, etc. are mentioned, for example. And typically, in the plant for growing plants such as seedlings in a space separated in a closed space like a so-called closed-type seedling production system, or a plant cultivation shelf in a vinyl house, the plant of the present invention Hybrid lighting unit is installed.

  As shown in FIG. 1, the hybrid lighting unit 100 for plants in the present embodiment is configured to include at least a first light source 10, a second light source 20, and a reflecting plate 30. Moreover, in the hybrid lighting unit 100 for plants of this embodiment, it is desirable to further include the housing 40.

The first light source 10 has a function of irradiating UV-B light. Since UV-B light is effective for suppressing diseases that cause harm to plants, it can be said that the first light source 10 has a function of suppressing diseases that adhere to plants.
The first light source 10 may have a wavelength of light other than UV-B. For example, by adding a phosphor emitting UV-B to a general three-wavelength Hf fluorescent tube, light in the visible light region of 400 to 700 nm other than UV-B may be included. The first light source 10 having such a wavelength other than UV-B is expected to improve the growth promoting effect on plants, such as contributing to the photosynthesis of plants.
In addition, when the main wavelengths of the second light source 20 described later are 400 to 500 nm and 600 to 700 nm, the first light source 10 includes the wavelength of 500 to 600 nm as a wavelength other than UV-B. In the case of 20, the wavelength range which can not be covered may be compensated. In this case, the ratio of light in the wavelength region of 500 to 600 nm irradiated by the first light source 10 is preferably 0.1 or more and 0.4 or less (10% or more and 40% or less).

As a specific example of the first light source 10, a fluorescent tube (hereinafter also referred to as a fluorescent tube 10) that emits UV-B light is used in the present embodiment. The fluorescent tube 10 is installed in a reflection plate described later so as to extend in the Y direction. Further, in the present embodiment, a plurality of (two) fluorescent tubes extending in the Y direction are arranged (10a, 10b) at predetermined intervals along the X direction.
Moreover, although illustration is abbreviate | omitted, this 1st light source 10 is connected with the power supply, respectively. As this power source, for example, a known power source such as a battery such as lithium ion or a commercial power source can be mentioned.

  In the present embodiment, an example is shown in which only one fluorescent tube 10 extending in the Y direction is arranged along the X direction. However, the present invention is not limited to this example. For example, UV-B light is The bulb-shaped light sources (bulb-shaped UV lamps having a wavelength of UV-B, etc.) to be irradiated may be arranged in a row in the Y-direction. In this case, the bulb-type UV lamps dotted in the Y direction and forming a line are arranged in a plurality of lines at predetermined intervals in the X direction.

  The second light source 20 does not include the wavelength of the UV-B region, and has a function of emitting light whose main wavelength is 400 nm or more. Examples of such a wavelength include light between 400 nm and 500 nm of visible light and light between 600 nm and 700 nm of visible light. These wavelengths fit, for example, the absorption spectra of carotene and chlorophyll, and it can be said that the second light source 20 has a function of promoting plant growth. Moreover, since light between 500 and 600 nm is easily absorbed by plants and contributes to photosynthesis of plants, the light irradiated from the second light source 20 may include this wavelength range.

And the 2nd light source 20 of this embodiment is arrange | positioned on the mounting surface 32 (after-mentioned) of the reflecting plate 30 so that it may be alternately located in a line with the above-mentioned 1st light source 10 in the X direction. As a specific example of such a second light source 20, in the present embodiment, a rod-like LED light source extending in the Y direction is applied.
Moreover, although illustration was abbreviate | omitted similarly to the 1st light source 10, this 2nd light source 20 is respectively connected with the power supply mentioned above, respectively.

  That is, as shown in FIG. 1, in the present embodiment, three LED light sources (hereinafter also referred to as LED light sources 20) as the second light source 20 are installed at predetermined intervals on the reflection plate 30 (20 a, 20 b , 20c). More specifically, the three LED light sources 20 are arranged in the X direction so as to sandwich the first light source 10 described above and so that both sides in the X direction become the LED light sources 20.

  In the present embodiment, an example is shown in which a plurality of LED light sources 20 extending in the Y direction are arranged in the X direction, but the present invention is not limited to this example. That is, as in the case of the first light source 10 described above, for example, the rows may be formed in a form in which the bulb-type LEDs are scattered in the Y direction. In this case, the rows of bulb-type LEDs dotted in the Y direction form a plurality of rows arranged at predetermined intervals in the X direction.

  The reflecting plate 30 is configured such that the peripheral edge in the direction (X direction) in which the first light source 20 and the second light source 20 are arranged is folded back to the light source side and simultaneously covers the first light source 10 and the second light source 20 simultaneously. ing. More specifically, both ends in the X direction of the reflection plate 30 are respectively folded back to the light source side to form folded portions 34.

  Further, as shown in FIG. 1, the plurality of fluorescent tubes 10a and 10b and the plurality of LED light sources 20a, 20b and 20c described above are disposed on the reflecting plate 30, respectively. Therefore, the light source mounting surface of the reflecting plate 30 has a size that allows installation of the fluorescent tubes 10 and the LED light sources 20 in the number described above at least in the X direction, and the fluorescent tubes 10 and the LED light sources 20 also It has a possible size.

  There is no restriction | limiting in particular as a material of this reflecting plate 30, For example, the well-known metal with high reflectances, such as an aluminum plate, can be applied. In the present embodiment, as an example of the reflecting plate 30, a mirror surface aluminum plate having a high reflectance of UV-B light is employed. The reflector 30 of the present embodiment is also characterized in that the reflectance of UV-B light is 80% or more. It is because the function as disease control with respect to a plant can not fully be exhibited as the reflectance of UV-B light is less than 80%.

  The reflective plate 30 only needs to secure at least 80% or more of the reflectance of UV-B light, so for example, an Al-deposited plate material on which aluminum is deposited on the back surface of a steel plate or the like, or white light with high light resistance. A film or the like may be used. In addition, the reflection plate 30 may have a multilayer structure, and a nickel plating layer, a chromium plating layer, a zinc plating layer, or the like may be formed on the lower layer side to have an anticorrosion function.

The housing 40 is a concave rectangular parallelepiped and has a function of accommodating the first light source 10, the second light source 20, and the reflecting plate 30 described above. The material of the housing 40 is not particularly limited, and examples thereof include various resins such as FRP, wood, and metal materials such as various steel plates.
In the present embodiment, a recess is formed in accordance with the shape on the back surface 31 side (the opposite side to the installation surface 32 of the light source) of the reflection plate 30, and the reflection plate 30 is a housing 40 via a known adhesive, for example. It is fixed to In addition, as a fixed direction to the housing | casing 40 of the reflecting plate 30, it is not restricted to above-mentioned adhesion | attachment, For example, the aspect fixed using physical means, such as a screw, may be sufficient.

<Directivity of First Light Source 10 and Second Light Source 20>
Next, with reference to FIG. 2, propagation characteristics of light emitted by the first light source (fluorescent tube) 10 and the second light source (LED light source) 20 in the present embodiment will be described.
FIG. 2 shows the results of measurement of the intensity (directivity) of light emitted when the respective light sources are arranged at the reference position SP.
In addition, in the case of the measurement of this embodiment, the directivity of the light which the 1st light source 10 and the 2nd light source 20 each irradiate was computed using the LED light distribution measurement system (GP-1000LO by Otsuka Electronics Co., Ltd.).

According to the drawing, it can be seen that the light emitted from the fluorescent tube 10 as the first light source is also irradiated to the upper side than the installation point, and thus has a characteristic that it spreads upward.
On the other hand, it can be seen that the light emitted from the LED light source 20 as the second light source does not expand upward above the installation point, and has the characteristic of expanding downward in a narrow range compared to the fluorescent tube 10 .

  As described above, in the present embodiment, the second light source (LED light source) 20 extending downward in a narrow range as compared to the fluorescent tube 10 is disposed on both sides with respect to the X direction of the reflecting plate 30, and disposed on both sides The first light source (fluorescent tube) 10 is sandwiched by the second light source (LED light source) 20. In addition to this, in the present embodiment, the second light source (LED light source) 20 disposed at the center is sandwiched by such a first light source (fluorescent tube) 10.

According to the present embodiment described above, since the first light source 10 and the second light source 20 are covered by the common reflecting plate 30, the portability can be improved and the installation property can be improved by a simple structure. Furthermore, since the light of the first light source 10 and the second light source 20 arranged in the above-described arrangement form is reflected by the reflection plate 30, light of a plurality of wavelengths necessary for growing a plant can be efficiently irradiated. Is possible.
At this time, the uniformity (average photon flux density / maximum photon flux density) of light irradiated from the hybrid lighting unit 100 for plants in the present embodiment is preferably 0.6 or more, and more preferably 0.7 or more. If this uniformity is 0.6 or more, since plants can be grown uniformly, it is possible to prevent growth differences from occurring at the positions of the plants.

Second Embodiment
Next, a hybrid lighting unit 200 for a plant according to a second embodiment of the present invention will be described with reference to FIG. In the first embodiment described above, there were no inclusions between the first light source 10 and the second light source 20, but in the present embodiment, the shielding portion 33 is provided between the first light source 10 and the second light source 20. There are major features in the
Therefore, in the following description, differences from the above-described embodiment will be mainly described, and members having the same functions as the above-described embodiment will be denoted by the same reference numerals, and the description thereof will be omitted as appropriate. As well).

That is, as shown in FIG. 3, in the hybrid lighting unit 200 for a plant of the present embodiment, the reflector 30 prevents the UV-B light emitted from the first light source 10 from being directly irradiated to the second light source 20. And a shielding portion 33 between the first light source 10 and the second light source 20.
The length of the shielding portion 33 in the Y direction is set, for example, to be equal to or longer than the length of the first light source 10 or the second light source 20 in the Y direction. Further, the width t of the shielding portion 33 in the X direction is substantially uniform (substantially the same) in the Z direction.

As described above, in the plant hybrid lighting unit 200, when the first light source 10 and the second light source 20 are juxtaposed on the mounting surface 32 of the reflecting plate 30, the UV-B light emitted from the first light source 10 is The irradiation of the second light source 20 may deteriorate the second light source 20.
On the other hand, according to the present embodiment, the mounting surface 32 is divided by providing the mounting surface 32 a of the first light source 10 and the mounting surface 32 b of the second light source 20 such that the shielding portion 33 intervenes. The UV-B light can be prevented from being directly irradiated to the second light source 20, whereby the deterioration of the second light source 20 due to the UV-B light can be suppressed.

  The height u of the shielding unit 33 in the Z direction can be set in consideration of the directivity of the UV-B light emitted from the first light source 10, but for example, the height u in the Z direction of the second light source 20 can be set. It is preferable that the height is the same or higher as long as the light emitted from the second light source 20 is not blocked. Alternatively, the height u of the shield 33 in the Z direction is preferably equal to or higher than the height of the first light source 10 in the Z direction.

As described above, in the present embodiment, the reflecting plate 30 has a total of four shielding portions 33, whereby the first light source 10 and the second light source 20 are divided via the shielding portions 33.
In addition, there is no restriction | limiting in particular as a formation method of the shielding part 33, For example, when shape | molding the reflecting plate 30 by press work or bending process, you may form the said shielding part 33 collectively. Alternatively, a member different from the reflection plate 30 may be fixed to the installation surface 32 of the reflection plate 30 by a known fixing means as the shielding portion 33. Examples of the known fixing means include adhesion using an adhesive, welding by heating, or physical fixation with a screw or the like.

  According to the hybrid lighting unit 200 for plants according to the second embodiment described above, in addition to the effects described in the first embodiment, it is possible to suppress the deterioration of the second light source 20 due to UV-B light There is.

Third Embodiment
Next, referring to FIG. 4, a plant hybrid illumination unit 300 according to a third embodiment of the present invention will be described. In the second embodiment described above, the width t of the shielding portion 33 in the Z direction is equal along the Z direction, but in the present embodiment, it is tapered (tapered or inclined) along the + Z direction. There is a main feature in the point that has become.

That is, as shown in FIG. 4, the shielding part 33 of this embodiment includes the first slope 33a on the first light source 10 side, the second slope 33c on the second light source 20 side, and the top face 33b. There is.
Among these, the top surface 33 b is substantially parallel to the installation surface 32 of the first light source 10 or the second light source 20.

Moreover, in FIG. 4, the directivity of the light irradiated toward + Z direction from the LED light source as the 2nd light source 20 is shown typically.
As described above, in the present embodiment, the shielding unit 33 prevents the first light source 10 from interfering with the light emitted from the second light source 20 toward the plant along the directivity of the light from the second light source 20. The first reflection surface 33a is disposed to be inclined toward the end. Thereby, it is suppressed that the intensity | strength of the light irradiated toward a plant from the 2nd light source 20 falls unnecessary.

  Although illustration is omitted, the first light source 10 may be considered similarly. That is, the shielding unit 33 does not interfere with the light emitted from the first light source 20 toward the plants along the directivity of the light from the first light source 10, and directly to the second light source 20. It is preferable that the second reflective surface 33 c is disposed to be inclined toward the second light source 20 so as not to be irradiated.

  According to the hybrid lighting unit for plants 300 according to the third embodiment described above, in addition to the effects described in the first embodiment and the second embodiment, the light irradiated to the plants is unnecessarily blocked. It is possible to suppress that.

Fourth Embodiment
Next, a hybrid lighting unit 400 for a plant according to a fourth embodiment of the present invention will be described with reference to FIG. In each of the above embodiments, the first light source 10 and the second light source 20 have the same installation position in the Z direction, but this embodiment is characterized mainly in that the position of the light source installation surface in the Z direction is different. is there.

That is, as shown to Fig.5 (a), the reflecting plate 30 of this embodiment is the 1st installation surface 32a in which the 1st light source 10 is installed, and the irradiation direction (+ Z direction) to the plant of this 1st light source 10 And a second installation surface 32b on which the second light source 20 is installed to be behind the first installation surface 32a.
In other words, the reflecting plate 30, the thickness _{v 1} from the back surface 31 to the first mounting surface 32a can be said to thicker than _{v 2} from the back surface 31 to the second mounting surface 32b.

Further, in the blocking portion 33 of the present embodiment, the length of the first slope 33a on the side of the first light source 10 is shorter than the length of the second slope 33c on the side of the second light source 20.
As a method of forming the reflective plate 30 having such a shape, various known methods can be adopted. For example, a metal plate having a thickness enough to secure the height of the second installation surface 32b is prepared in advance. The shapes of the bottom surfaces (the first installation surface 32a and the second installation surface 32b) having different heights may be formed by pressing or bending.

  Alternatively, after the main shape of the reflecting plate 30 is formed by pressing using a metal plate so that the setting surface 32 has the height of the second setting surface 32b, the shielding portion 33 and the second shape as shown in FIG. Another member integrally molded with the first installation surface 32 a may be fixed to the installation surface 32. As the fixing method in this case, as described above, adhesion fixation using an adhesive, fusion fixation using heating, or physical fixation using a screw or the like can be mentioned.

  According to the hybrid lighting unit 400 for plants according to the fourth embodiment described above, in addition to the effects described in the first embodiment, deterioration of the second light source 20 by UV-B light by a method different from the second embodiment It is possible to suppress

Fifth Embodiment
Next, a hybrid lighting unit 500 for a plant according to a fifth embodiment of the present invention will be described with reference to FIG. In the third and fourth embodiments described above, the first slope 32a and the second slope 33c have substantially the same degree of inclination relative to the normal direction (Z direction in FIG. 6) of the installation surface 32, but in the present embodiment The present invention is characterized mainly in that the inclination degrees of the first slope 32a and the second slope 33c with respect to the normal direction are different from each other.

That is, as shown in FIG. 6, the normal direction to the installation surface 32 (a plane parallel to the X direction, which is the target for both the first installation surface 32a and the second installation surface 32b in this embodiment) is the + Z direction. The inclination degree of the first slope 33a with respect to the normal direction (the angle formed by the normal direction and the first slope 33a) is α, and the inclination degree of the second slope 33c with the normal direction (normal direction and the second The relationship “α> β” is satisfied, where β is an angle formed by the slope 33 c.
In other words, in the present embodiment, it can be said that in the shielding portion 33, the degree of inclination of the slope 33a facing the first light source 10 and the degree of inclination of the slope 33c facing the second light source 20 are different from each other. .

In other words, in the present embodiment, the UV-B light from the first light source 10 is directly transmitted to the second light source 20 while allowing the spread of the LED light source as the second light source 20 in the horizontal (X) direction to the maximum. It is characterized in that the effect of suppressing the disease that is not irradiated and which adheres to the plant disposed immediately below the first light source 10 is enhanced.
In addition, as a formation method of the reflective plate 30 of such a shape, the method similar to above-described 4th Embodiment can be considered.

  According to the hybrid lighting unit 500 for plants according to the fifth embodiment described above, in addition to the effects described in the first to third embodiments, it is possible to enhance the disease suppression effect.

Each embodiment described above is an example, and various modifications can be made without departing from the spirit of the present invention.
For example, a new plant hybrid lighting unit may be configured by appropriately combining the first to fifth embodiments described above.
Further, for example, as in the hybrid lighting unit 600 for plants shown in FIG. 7, it can be attached to the outer periphery of the housing 40 or the folded back portion 34 and has a reflection effect in the irradiation direction of the first light source 10 or the second light source 20 The end reflection member 35 may be attached. In addition, when attaching to the outer periphery of the folding | returning part 34, you may fix the edge reflection member 35 with an adhesive agent or welding like the hybrid lighting unit 600 for plants, for example, The hybrid lighting unit for plants shown to the figure When attaching to the outer periphery of the housing 40 as in 700, in addition to the above method, a method of fixing using a rivet, a magnet, or the like may be used as appropriate. Further, the end reflection member 35 of the present embodiment may be configured as an openable / closable mechanism or a removable mechanism for the purpose of improving workability such as removal.
By attaching the end reflection member 35 having such a reflection effect, it is possible to suppress the waste of the light emitted from the light source and efficiently irradiate the light to the plant. The material of the end reflection member 35 is not particularly limited, but, for example, the same material as that of the reflection plate 30 may be applied.

  Moreover, although the 1st light source 10 and the 2nd light source 20 employ | adopted both a straight pipe type in the said embodiment, it is not limited to this example. That is, at least one of the first light source 10 and the second light source 20 may be a plurality of bulb-shaped light sources arranged along the Y direction. In this case, the rows of point light sources arranged along the Y direction are arranged in the X direction with a predetermined interval.

Moreover, the length in the X direction of the second installation surface 32 b may be longer than the length in the X direction of the first installation surface 32 a. In other words, it can be said that the width in the X direction with respect to the installation surface of the second light source 20 may be configured to be wider than the width in the X direction with respect to the installation surface of the first light source 10.
In each of the above-described embodiments, two types of first light sources 10 and second light sources 20 for emitting light of different wavelengths are disposed on the reflecting plate 30. However, the present invention is not limited to this. A light source may be used.

[Confirmation tests such as plant growth promotion and disease control]
Next, in order to confirm various effects such as growth promotion and disease control of plants when the hybrid lighting unit for plants of the present invention is used, the end shown in FIG. 7 in the hybrid lighting unit 100 for plants of the first embodiment as an example. The confirmation test was performed as follows using what attached the part reflective member 35 (length 150 mm) to the four sides of the illuminating device with the magnet.
That is, as shown in FIG. 8, using a tomato seedling as an example of the plant P, the plant for which the height is about 70 to 90 mm, for the seedling which has passed only the number of days set as the cultivation preparation period It was grown under the hybrid lighting unit 100. And when the cultivation period set as predetermined days from a cultivation start passes, evaluation of disease control was mainly performed on the assumption that the plant P grew to the size which can graft it.

In the confirmation test, a tomato seedling is selected as an example of the plant P, and evaluation of presence / absence of variation in growth of the plant P, density of leaf color and graft quality is also performed in addition to the effect of disease control. did.
The conditions and evaluation criteria in this confirmation test were set as follows.
<Installation conditions>
(1) cultivar and number: 200 each of shogi (house Momotaro) and root tree (super good relationship) 200 (2) cultivation preparation period: 4 days (3) cultivation period: 13 to 17 days (4) standard cultivation surface CS: A plane (medium surface) when placed in a container for cultivating the plant P to be subjected to the test, and any 9 points of the culture medium surface to be subjected to the test are measured and calculated on the average (5) PPFD (photosynthetically effective photon flux density) in: the number of unit area and the number of photons per unit time in the wavelength range of 400-700 nm effective for photosynthesis, set to 170 to 300 μmol / m ² · s (6) Installation of light source Height h ₁ : Adjust the PPFD of the reference culture surface CS to be in the above range (7) PFD (photon flux density: number of photons per unit area and unit area) in the reference culture surface CS blue, green, red , Far Color ratio: Blue to 400 to 499 nm, green to 500 to 599 nm, red to 600 to 699 nm, far-red wavelength from numerical values measured using a commercially available spectrum meter capable of measuring the wavelength range 380 to 780 nm Calculate each energy ratio in the case of 700 to 780 nm

<Evaluation criteria>
(1) Disease control: A person having plant cultivation experience for a year or more visually observes the plant P, and if disease is occurring, it is 〇, and if it is not, it is ×.
(2) Variation in growth: Of the 200 grown plants, arbitrary 6 out of 200 cultivated surfaces different from each other are extracted from any part, and the total length of seedlings out of the 6 seedlings on the ground surface is measured, Calculate the average value of these. Then, the variation is calculated from the calculated average value by the standard deviation (σ), and the following circle, circle, and circle are set as follows.
: 1: 5 or more of any 6 mentioned above within 1σ are included Δ: 4 out of 6 any given above mentioned within 1σ are included ×: 1 out of any 6 mentioned above within 1σ Less than half included (3) Leaf color: A person who has plant cultivation experience for a year or more visually determines the density of leaf color and evaluates it as "dark", "normal" and "light", respectively.
(4) Grafting property: The grafting ease when each of 200 plants to be tested is touched is evaluated according to the following criteria.
○: A person with a grafting experience of 1 year or more can graft well 茎: The stem is a little soft, but if it is the above-mentioned person, it will be closed. ×: The stem will be soft and the above-mentioned person can not be approached.

  The confirmation test of growth promotion of plant P and disease control was done in each example using the above conditions and evaluation criteria. At this time, the PPFD of the reference cultivation surface CS, the wavelength spectrum of the PFD of the reference cultivation surface CS, and the intensity of the UV-B wavelength were also appropriately measured in each example.

Example 1
The hybrid lighting unit 100 for plants is installed above the plant P so that the PPFD of the reference cultivation surface CS becomes 175 μmol / m ² · s using the aquacy MQ-80 (measurable wavelength region 400-700 nm) did.

  Furthermore, when PFD in the reference cultivation surface CS of this Example 1 was measured by the spectrum meter MK350S (measurable wavelength region 380-780 nm) made by UPRtek, in hybrid lighting unit 100 for plants in Example 1, 425 nm-445 nm It was found to have a blue wavelength peak, a green wavelength peak at 535 nm to 555 nm, a red wavelength peak at 645 nm to 665 nm, and a far red wavelength peak at 700 nm to 720 nm.

Furthermore, when the ratio of each wavelength of blue, green, red and far red is calculated from the result measured with the above-mentioned spectrum meter, it is 12.4%, 30.3%, 46.1% and 11.2% respectively I understand. Among these, the ratio of blue / red was 0.27.
Further, the UV-B intensity in Example 1, was measured using a Solarmeter Co. digital UV intensity meter UV-6.2, was 10μW / cm ^2.

And the disease suppression with respect to the plant P, the dispersion | variation in growth, leaf color, and graft property were evaluated on the above-mentioned installation conditions, respectively.
Table 1 shows the PPFD of the reference cultivation surface CS obtained in the above, the ratio of each color in the PFD of the reference cultivation surface CS, the UV-B intensity, and each evaluation result.

Example 2
The plant hybrid lighting unit 100 is installed above the plant P so that the PPFD of the reference cultivation surface CS is 207 μmol / m ² · s, and the blue, green, red and far red wavelengths in the PFD of the reference cultivation surface CS The same procedure as in Example 1 was carried out except that the proportions of B.1 and B.2 were 18.2%, 21.8%, 53.5% and 6.5%, respectively.

The hybrid lighting unit for plants 100 in Example 2 has a peak of blue wavelength at 430 nm to 450 nm, a peak of green wavelength at 535 nm to 555 nm, and a peak of red wavelength at 650 nm to 670 nm, 700 nm to It turned out that it has a peak of far-red wavelength in 720 nm, respectively.
The PPFD of the reference cultivation surface CS obtained as described above, the ratio of each color in the PFD of the reference cultivation surface CS, the UV-B intensity, and each evaluation result are shown in Table 1. The blue / red ratio in this Example 2 was 0.34.

Example 3
The hybrid lighting unit 100 for plants is installed above the plant P so that the PPFD of the reference culture surface CS is 193 μmol / m ² · s, and the blue, green, red and far red wavelengths in the PFD of the reference culture surface CS Example 4 was carried out in the same manner as Example 1 except that the proportions of (1),. Among these, the ratio of blue / red was 0.31.

The hybrid lighting unit 100 for plants in Example 3 has a peak of blue wavelength at 430 nm to 450 nm, a peak of green wavelength at 535 nm to 555 nm, and a peak of red wavelength at 650 nm to 670 nm, 700 nm to It turned out that it has a peak of far-red wavelength in 720 nm, respectively.
Table 1 shows the PPFD of the reference cultivation surface CS obtained in the above, the ratio of each color in the PFD of the reference cultivation surface CS, the UV-B intensity, and each evaluation result.

Example 4
The ratio of each wavelength of blue, green, red and far red in the PFD of the standard cultivation surface CS is 12.4%, 27.3%, 41.6% and 18.7% respectively, and the UV-B intensity is 20 μW. The same procedure was performed as in Example 1 except that the pressure was changed to / cm ² .
The PPFD of the reference cultivation surface CS obtained as described above, the ratio of each color in the PFD of the reference cultivation surface CS, the UV-B intensity, and each evaluation result are shown in Table 1. The blue / red ratio in this Example 4 was 0.30.

Example 5
The same procedure as in Example 2 was carried out except that the UV-B intensity was changed to 20 μW / cm ² .
Table 1 shows the PPFD of the reference cultivation surface CS obtained in the above, the ratio of each color in the PFD of the reference cultivation surface CS, the UV-B intensity, and each evaluation result. The blue / red ratio in this Example 5 was 0.34.

Example 6
The ratio of each wavelength of blue, green, red and far red in the PFD of the standard cultivation surface CS is 15.8%, 28.1%, 50.5% and 5.6%, respectively, and the UV-B intensity is 20 μW / The same procedure as in Example 3 was performed except that the cm ² was used.
The hybrid lighting unit 100 for plants in Example 6 has a peak of blue wavelength at 430 nm to 450 nm, a peak of green wavelength at 535 nm to 555 nm, and a peak of red wavelength at 650 nm to 670 nm, and 730 nm to It was found that each had a far-red wavelength peak at 750 nm.
Table 1 shows the PPFD of the reference cultivation surface CS obtained in the above, the ratio of each color in the PFD of the reference cultivation surface CS, the UV-B intensity, and each evaluation result. The blue / red ratio in this Example 6 was 0.31.

Example 7
The hybrid lighting unit 100 for plants is installed above the plant P so that the PPFD of the reference culture surface CS is 277 μmol / m ² · s, the UV-B intensity is 15 μW / cm ^2, and the PFD of the reference culture surface CS is PFD. The same procedure as in Example 2 was carried out except that the proportions of the blue, green, red and far-red wavelengths were 20.7%, 25.1%, 47.8% and 6.4%, respectively. Among these, the ratio of blue / red was 0.43.
Table 1 shows the PPFD of the reference cultivation surface CS obtained in the above, the ratio of each color in the PFD of the reference cultivation surface CS, the UV-B intensity, and each evaluation result.

Example 8
The hybrid lighting unit 100 for plants is installed above the plant P so that the PPFD of the reference cultivation surface CS is 283 μmol / m ² · s, the UV-B intensity is 5 μW / cm ^2, and the PFD of the reference cultivation surface CS is PFD. The procedure of Example 2 was repeated except that the proportions of blue, green, red and far-red wavelengths were set to 18.2%, 21.9%, 52.0% and 7.9%, respectively. Among these, the ratio of blue / red was 0.35.
Table 1 shows the PPFD of the reference cultivation surface CS obtained in the above, the ratio of each color in the PFD of the reference cultivation surface CS, the UV-B intensity, and each evaluation result.

Example 9
The hybrid lighting unit 100 for plants is installed above the plant P so that the PPFD of the reference culture surface CS is 266 μmol / m ² · s, the UV-B intensity is 15 μW / cm ^2, and the PFD of the reference culture surface CS is PFD. The procedure of Example 3 was repeated except that the proportions of blue, green, red and far-red wavelengths were set to 19.3%, 28.2%, 46.5% and 6.0%, respectively. Among these, the ratio of blue / red was 0.42.

The hybrid lighting unit for plants 100 in Example 9 has a peak of blue wavelength at 430 nm to 450 nm, a peak of green wavelength at 535 nm to 555 nm, and a peak of red wavelength at 640 nm to 660 nm, 700 nm to It turned out that it has a peak of far-red wavelength in 720 nm, respectively.
Table 1 shows the PPFD of the reference cultivation surface CS obtained in the above, the ratio of each color in the PFD of the reference cultivation surface CS, the UV-B intensity, and each evaluation result.

Example 10
The hybrid lighting unit 100 for plants is placed above the plant P so that the PPFD of the reference culture surface CS is 287 μmol / m ² · s, the UV-B intensity is 5 μW / cm ^2, and the PFD of the reference culture surface CS is PFD. The same procedure as in Example 9 was carried out except that the proportions of blue, green, red and far-red wavelengths were set to 16.3%, 27.1%, 49.8% and 6.8%, respectively. Among these, the ratio of blue / red was 0.33.
Table 1 shows the PPFD of the reference cultivation surface CS obtained in the above, the ratio of each color in the PFD of the reference cultivation surface CS, the UV-B intensity, and each evaluation result.

Example 11
The number of the first light sources 10 and the number of the second light sources 20 are increased by one each with respect to the plant lighting unit 100 of each of the above-described examples. That is, in the plant lighting unit 100, three first light sources 10 and four second light sources 20 were used, and the first light sources 10 were installed between the second light sources 20, respectively. The hybrid lighting unit 100 for plants is placed above the plant P so that the PPFD of the reference culture surface CS is 283 μmol / m ² · s, the UV-B intensity is 3 μW / cm ^2, and the PFD of the reference culture surface CS is PFD. The procedure of Example 2 was repeated except that the proportions of blue, green, red and far-red wavelengths were set to 18.2%, 21.9%, 52.0% and 7.9%, respectively. Among these, the ratio of blue / red was 0.35.
Table 1 shows the PPFD of the reference cultivation surface CS obtained in the above, the ratio of each color in the PFD of the reference cultivation surface CS, the UV-B intensity, and each evaluation result.

Example 12
The hybrid lighting unit 100 for plants is installed above the plant P so that the PPFD of the reference culture surface CS is 220 μmol / m ² · s, the UV-B intensity is 5 μW / cm ^2, and the PFD of the reference culture surface CS is PFD. The procedure of Example 4 was repeated, except that the proportions of the blue, green, red and far-red wavelengths were 24.8%, 40.6%, 29.7% and 4.9%, respectively. Among these, the ratio of blue / red was 0.84.

It can be seen that the plant hybrid illumination unit 100 in Example 12 is configured to have a blue wavelength peak at 430 nm to 480 nm with so-called white light quality.
Table 1 shows the PPFD of the reference cultivation surface CS obtained in the above, the ratio of each color in the PFD of the reference cultivation surface CS, the UV-B intensity, and each evaluation result.

Comparative Example 1
As a comparative example, the lighting unit which changed all the 1st light source 10 and the 2nd light source 20 in hybrid lighting unit 100 for plants into a fluorescent lamp was used. In other words, in this comparative example 1, the hybrid lighting unit for plants replaced with fluorescent light without irradiating UV-B was used. At this time, the hybrid lighting unit for plants is installed above the plant P so that the PPFD of the reference culture surface CS is 200 μmol / m ² · s, and blue, green, red and far red in the PFD of the reference culture surface CS. The ratio of each wavelength of is set to 25.8%, 41.7%, 29.0%, and 3.5%, respectively. The other points were the same as in Example 1. Among these, the ratio of blue / red was 0.89.

The wavelength spectrum (380 nm-780 nm) of the visible light region in PPFD at this time is shown in FIG.
Table 1 shows the PPFD of the reference cultivation surface CS obtained in the above, the ratio of each color in the PFD of the reference cultivation surface CS, the UV-B intensity, and each evaluation result.

As is clear from Table 1, all the hybrid lighting units for plants shown in the respective examples showed an effect of disease control. In addition, in some examples, in addition to the effect of disease control, good leaf color and grafting property were also recognized, and further, some examples in which variation in growth was also suppressed were able to be confirmed.
Moreover, according to each above-mentioned Example, in the hybrid lighting unit for plants, UV-B intensity | strength of reference | standard cultivation surface CS installed directly under the 1st light source 10 and the 2nd light source 20 is 3-20 microwatts / cm. preferably ^2, further it can be seen better When it is 5~20μW / cm ^2.
Further, according to each of the above-described embodiments, in the hybrid lighting unit for plants, the peak of blue wavelength is 430 nm to 450 nm, the peak of green wavelength is 535 nm to 555 nm, the peak of red wavelength is 640 nm to 670 nm, It can be seen that it is preferable to have a far-red wavelength peak at 700 nm to 750 nm, respectively.
Furthermore, according to each embodiment described above, in the hybrid lighting unit for plants, the PPFD in the reference cultivation surface CS is preferably in the range of 193 to 277 μmol / m ² · s, and more preferably 207 to 266 μmol / m ^2. It can be seen that it is still preferable to be in the range of s.
In addition, the ratio of blue to red (B / R value) of PFD on the cultivation side is preferably more than 0.26 and less than 0.89, and further, the ratio of blue to red (B / R value) It is understood that the graftability is also good for those having a value of more than 0.3 and not more than 0.5.
Furthermore, it can be seen that the growth promoting effect is high when the ratio of the far red color of PFD in the cultivation surface exceeds 5% and is 8% or less after UVB irradiation.
On the other hand, in the comparative example, although some variation in growth and graftability can be secured, an effect on disease control could not be obtained.

  As explained above, the hybrid lighting unit for plants of the present invention can be widely applied in the plant cultivation field regardless of the type of plant.

100-500 hybrid lighting unit for plants 10 first light source 20 second light source 30 reflection plate 31 back surface 32 installation surface 33 shielding portion 34 folded portion 35 end reflection member 40 casing

Claims (7)

A first light source for emitting UV-B light;
A second light source disposed side by side with the first light source and not including the wavelength of the UV-B region and having light of 400 nm or more as a main wavelength;
A reflection plate which is folded back to the light source side in a direction in which the first light source and the second light source are arranged side by side and covers the first light source and the second light source simultaneously;
A hybrid lighting unit for plants, characterized in that it comprises:   The reflecting plate has a shielding portion between the first light source and the second light source so that the UV-B light emitted from the first light source is not directly irradiated to the second light source. The hybrid lighting unit for plants according to claim 1.   The said shielding part is inclined and arrange | positioned toward the said 1st light source so that it may not become obstruction of the said irradiated light along the directivity of the light irradiated from the said 2nd light source. Hybrid lighting unit for plants. The shielding unit is
The hybrid lighting unit for plants according to claim 2 or 3, wherein the inclination degree of the slope facing the first light source and the inclination degree of the slope facing the second light source are different from each other. The reflector is
A first installation surface on which the first light source is installed;
A second installation surface on which the second light source is installed to be behind the first installation surface with respect to the irradiation direction of the first light source;
The hybrid lighting unit for plants as described in any one of Claims 1-4 which has these. It said first and second light sources for plants hybrid lighting unit according to any one of claims 1 to 5 UV-B intensity of the reference cultivation surface installed is 3~20μW / cm ² directly beneath the .   The peak of the blue wavelength at 430 nm to 450 nm, the peak of the green wavelength at 535 nm to 555 nm, the peak of the red wavelength at 640 nm to 670 nm, and the peak of the far red wavelength at 700 nm to 750 nm The hybrid lighting unit for plants according to any one of the preceding claims.