JP2015019654A - Plant cultivation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plant cultivation device that applies light to a plant from the lower side efficiently.SOLUTION: A first light source unit (10A) comprises an LED (11) that emits light, and a lens (13) that allows the light emitted vertically upward from the LED (11) to be directed toward directions other than the vertically upward direction, and the first light source unit is disposed at a position away from a planting part (20) in a horizontal direction.

Description

  The present invention relates to a plant cultivation apparatus that can directly irradiate light to a plant with respect to plant cultivation.

  In recent years, plant factories and plant planters have been attracting attention as a means of rehabilitating disaster-affected areas that suffer from salt damage and radioactive contamination caused by the tsunami following the Great East Japan Earthquake. In addition, light sources such as fluorescent lamps, high-pressure sodium lamps, and LEDs are used as artificial light sources for plant factories and plant planters, and construction of methods for efficiently growing plants with low energy consumption and low cost is being promoted.

  In plant factories, it is necessary to irradiate plants with sufficient light instead of sunlight. When light is applied from the lower side of the plant, the light is also applied to the leaves that are not exposed to light only from the upper side of the plant, which is advantageous for the growth of the plant. However, when light is applied from the lower side of the plant, heat from the light source may damage the plant, so that there is a problem that the light source cannot be placed directly close to the root part of the plant.

  For example, Patent Literature 1 discloses a light supplement device for plant cultivation that can supplement light from the lower side of a plant. In the plant cultivation light supplement device 100 disclosed in Patent Document 1, as shown in FIG. 10, a gas supply duct 101 including a light source 104 that irradiates light to an end portion is provided. The gas supply duct 101 has a transparent upper surface and side surfaces and a reflecting surface 102 on the lower surface.

  In the plant cultivation light supplement device 100, as shown in FIG. 11, the gas supply duct 101 is installed on the lower side of the plant 103, and the end portion of the gas supply duct 101 swells in a cylindrical shape. Light is emitted from the light source 104 in the longitudinal direction of the gas supply duct 101. Thereby, the light reflected by the reflecting surface 102 on the lower surface of the gas supply duct 101 is emitted from the upper part of the gas supply duct 101. As a result, in the plant cultivation supplementary device 100, the light source 104 can irradiate the plant from below with the light source 104 being away from the root part of the plant.

Japanese Patent Laid-Open No. 4-200322 (released July 21, 1992)

  However, in the conventional plant cultivation light supplement device 100 disclosed in Patent Document 1, light is radiated upward by the radiation of light by the reflecting surface 102 of the gas supply duct 101, but the diffusion effect and the like are considered. Not. Therefore, normally, light is radiated strongly above the gas supply duct 101 vertically. As a result, there is a problem that a lot of light is not directly irradiated to the plant 103 and the plant cannot be irradiated with light efficiently.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a plant cultivation apparatus that efficiently irradiates light from the lower side to a plant.

  In order to solve the above problems, a plant cultivation apparatus according to an aspect of the present invention is a plant cultivation apparatus including a planting unit for planting a plant and a first light source unit that irradiates light to the plant. The first light source unit includes a light source unit that emits light, and a lens unit that directs light emitted above the light source unit vertically above the light source unit in a direction other than the vertical upward direction. It is characterized by being arranged at a position away from the planting part in the horizontal direction.

  According to one aspect of the present invention, there is an effect of providing a plant cultivation apparatus that efficiently irradiates a plant with light from below.

It is sectional drawing which shows the structure of the principal part of the plant cultivation apparatus which concerns on Embodiment 1 of this invention. It is a side view which shows the whole structure of the said plant cultivation apparatus. It is a top view which shows the arrangement | positioning relationship between the 1st light source unit and the planting part in the said plant cultivation apparatus. (A) is a top view which shows the structure of the 1st light source unit of the said plant cultivation apparatus, (b) is the sectional drawing. It is a top view which shows the modification of the arrangement | positioning relationship between the 1st light source unit and the planting part in the said plant cultivation apparatus. It is a top view which shows the structure of the 1st light source unit of the plant cultivation apparatus which concerns on Embodiment 2 of this invention. It is a top view which shows the arrangement | positioning relationship between the 1st light source unit and the planting part in the said plant cultivation apparatus. It is a side view which shows the structure of the plant cultivation apparatus which concerns on Embodiment 3 of this invention. (A) is a side view which shows the structure of the 2nd light source unit of the said plant cultivation apparatus, (b) is a front view which shows the structure of the light source part of the said 2nd light source unit. It is a perspective view which shows the structure of the conventional light supplement apparatus for plant cultivation. It is a side view which shows the state which installed the said light supplement apparatus for plant cultivation below the plant.

  A plant cultivation apparatus according to an embodiment of the present invention will be described with reference to the drawings. In the following description of the embodiments, the same or corresponding parts in the drawings are denoted by the same reference numerals, and the description thereof is omitted.

Embodiment 1
(Configuration of plant cultivation apparatus 1A)
A configuration of a plant cultivation apparatus 1A according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view illustrating a configuration of a main part of a plant cultivation apparatus 1A according to Embodiment 1 of the present invention. FIG. 2 is a side view showing the overall configuration of the plant cultivation apparatus 1A. FIG. 3 is a plan view showing an arrangement relationship between the first light source unit 10A and the planting unit 20 in the plant cultivation apparatus 1A.

  As shown in FIG. 2, the plant cultivation apparatus 1 </ b> A includes a plurality of planting units 20 in which plants 21 are planted, and a first light source unit 10 </ b> A is provided between the planting units 20. In FIG. 2, a plurality of planting parts 20 are provided. However, the present invention is not necessarily limited to this, and there is only one planting part 20 and one first light source unit 10A. May be.

  In the plant cultivation device 1 </ b> A of the present embodiment, the first light source unit 10 </ b> A irradiates the plant 21 planted in the planting unit 20 with light from below. In addition, light is irradiated from the upper side, for example with sunlight. As a result, the plant 21 can shine light not only from the upper side but also from the lower side, so that it can shine light on the leaves that are not exposed to light only from the upper side. .

  Further, the planting unit 20 and the first light source unit 10A are arranged at positions separated from each other in the horizontal direction. Thus, the damage to the plant 21 due to the heat from the first light source unit 10A can be prevented by increasing the distance between the planting unit 20 and the first light source unit 10A.

  Furthermore, in the plant cultivation apparatus 1A of the present embodiment, as shown in FIG. 1, the planting unit 20 and the first light source unit 10A have the highest light intensity among the light L2 emitted from the first light source unit 10A. It arrange | positions so that the strong light L2 may be irradiated to the plant 21. FIG. At this time, when the emission angle between the light L2 having the highest light intensity and the horizontal direction is θ, it is desirable to set the emission angle θ to 60 ° or less. The reason will be described below.

  That is, in the plant cultivation apparatus 1A, when the grown plants 21 come into contact with each other, there is a problem that the growth of the plants 21 is inhibited and the quality of the cultivated plants 21 is deteriorated. Furthermore, in the plant cultivation apparatus 1A, when the leaves of the adjacent plants 21 overlap, the light L2 is blocked by the leaves of one plant 21, and the light L2 does not hit the leaves of the other plant 21, and the light L2 There is a problem that the irradiation efficiency decreases. Therefore, it is desirable that the plants 21 be installed at a distance so that the plants 21 do not come into contact with each other even if the plants 21 grow. Specifically, the distance between the plants 21 is preferably, for example, 5 cm to 20 cm. However, since the distance between the plants 21 varies depending on the size of the plant 21, it is not necessarily limited thereto. Assuming such a situation, the extent of the emission angle θ up to the effective light L2 for the plant 21 depends on the growth stage of the plant 21 and the like. For example, in the initial growth stage where the plant 21 is short, light L2 having an emission angle θ = 45 ° or less is effectively irradiated on the leaves of the plant 21. On the other hand, in the late stage of growth when the plant 21 is tall, light L2 having an emission angle θ of about 60 ° is also effectively applied to the leaves of the plant 21. For this reason, when it is desired to irradiate a lot of light L2 at the late stage of growth of the plant 21, the emission angle θ is set to about 60 °, and when it is desired to irradiate a lot of light at the initial stage of growth, the emission angle θ is about 45 ° Set as appropriate. It should be noted that if the emission angle θ is approximately 60 ° or less, an advantageous effect for growing the plant 21 can be obtained.

  Moreover, when the planting part 20 exists in two places and the 1st light source unit 10A exists between them, distance D1 * D2 of 10 A of 1st light source units and the planting part 20 is as shown in FIG. It is installed so that it may become the same distance. Thereby, 10 A of 1st light source units can irradiate the same amount of light with respect to the plant 21 installed in both sides. As a result, it is possible to prevent a difference in the growth of the plant 21 depending on the plant 21 growth position. Moreover, since the number of 1st light source units 10A required with respect to the some plant 21 can be reduced, it leads to the cost reduction of 1 A of plant cultivation apparatuses.

(Configuration of the first light source unit 10A)
Next, the configuration of the first light source unit 10A will be described with reference to FIGS. 4A is a plan view showing the configuration of the first light source unit 10A, and FIG. 4B is a cross-sectional view showing the configuration of the first light source unit 10A.

  As shown in FIGS. 4A and 4B, the first light source unit 10A includes an LED 11 (light source unit), a substrate 12, a lens 13 (lens unit), and a pin 14.

  For example, one LED 11 is formed on the substrate 12. Note that the number of LEDs 11 is not necessarily limited to one, but may be a plurality. The lens 13 is connected to the substrate 12 by, for example, three pins 14. Since the lens 13 is connected to the substrate 12, the upper portion of the LED 11 is covered with the lens 13. The size of the LED 11 is about 1.5 cm in diameter, for example. By covering the upper part of the LED 11 with the lens 13 of the present embodiment, the light intensity in the vertically upper direction of the light L1 emitted from the LED 11 is weakened, and the light intensity is increased in a direction other than the vertically upper direction in which the plant 21 exists.

  Here, when the lens 13 and the substrate 12 are connected, since the LED 11 is provided on the surface of the substrate 12, a gap 15 is formed between the lens 13 and the substrate 12. Therefore, in this embodiment, the gap 15 is sealed with a sealing agent. Thereby, a sealed structure in which no liquid enters between the LED 11 and the lens 13 can be produced. With the above configuration, the first light source unit 10A can be used continuously while maintaining electrical reliability without being submerged between the lens 13 and the LED 11, and a cultivation environment such as hydroponics. The effect can be exhibited even under. However, the manufacturing method of the sealed structure of the first light source unit 10A is not limited to the above. For example, a sealing agent may be applied in advance to the substrate 12 side, and the lens 13 may be covered from above and sealed. Further, the sealing agent is not limited, but for example, an elastic adhesive such as a silicone sealant or a rubber packing can be used.

  Here, a cavity is formed inside the lens 13 of the first light source unit 10A of the present embodiment, and the LED 11 is disposed below the cavity. For this reason, the light L1 emitted from the LED 11 is incident on the lens 13 from the light incident surface 13a that is the inner surface of the lens 13, and is emitted from the light emitting surface 13b that is the outer surface. At this time, the light L1 emitted from the LED 11 is refracted according to the inclination angle of the light incident surface 13a, which is the inner surface of the lens 13, and is incident on the inside of the lens 13. The incident angle of the lens 13 is maintained while maintaining the incident angle. After reaching the light emitting surface 13b which is the outer surface, the light is refracted according to the inclination angle of the light emitting surface 13b and emitted to the outside.

  Therefore, in the lens 13 of the present embodiment, among the light L1 emitted from the LED 11, the light L1 emitted vertically upward is changed in the traveling direction on both the light incident surface 13a and the light emitting surface 13b, and the vertically upward Is emitted from the first light source unit 10A as light L2 in the other direction.

  In order to provide the above-described action, the cross-sectional shape of the light incident surface 13a that is the inner surface of the lens 13 of the present embodiment is substantially the same as the optical axis Z on the optical axis Z of the LED 11, as shown in FIG. It intersects perpendicularly, and the inclination of the outline changes greatly in the vicinity of the optical axis Z, and the inclination of the outline does not change much at a distance from the optical axis Z, so that it has a bell shape. On the other hand, the cross-sectional shape of the light exit surface 13b, which is the outer surface of the lens 13, is such that the contour is tilted substantially perpendicular to the optical axis Z in the vicinity of the optical axis Z and the tilt change is small. The shape of the light has a shape that gradually changes in a direction parallel to the optical axis Z. Thereby, the shape of the light exit surface 13b near the optical axis Z is a concave shape.

  The cross-sectional shapes of the light incident surface 13a and the light emitting surface 13b of the lens 13 are not necessarily limited to this, and can be slightly changed. That is, any light L1 emitted vertically upward from the LED 11 may be used as long as the light L1 is directed in a direction other than the vertically upward direction. For example, the cross-sectional shape of the light incident surface 13a of the lens 13 is circular or the cavity of the lens 13 is hollow. It is possible to eliminate itself.

  The lens 13 can be formed of a transparent resin material such as polymethyl methacrylate (PMMA), polycarbonate (PC), epoxy resin (EP), or transparent glass.

  Thus, in the first light source unit 10A of the present embodiment, since the lens 13 has the cross-sectional shape described above, the light L1 emitted vertically upward from the LED 11 is directed by the lens 13 and other than vertically upward. The light L2 emitted as the light L2 and emitted from the first light source unit has a maximum light intensity at a position other than vertically above. As a result, the leaves of the plant 21 arranged in the plant cultivation apparatus 1A can be efficiently directly irradiated with light from the lower side.

  Moreover, since 1 A of plant cultivation apparatuses use LED11 as a light source, compared with the sodium lamp used as the light source of the light supplement apparatus 100 for plant cultivation described in patent document 1, energy saving is realizable. Furthermore, when a sodium lamp was used, direct light from the vicinity of the plant 21 could not be irradiated in order to avoid problems such as burning of leaves due to heat rays. On the other hand, since the plant cultivation apparatus 1A uses the LED 11, it is possible to irradiate light directly from the vicinity of the plant 21 without worrying about burning of leaves due to heat rays, and to increase the irradiation efficiency of the light L2. . Moreover, the dominant wavelength of LED11 is 400 nm-450 nm, and other wavelengths are also included. The wavelength of 400 nm to 450 nm is smaller than the wavelength of 600 nm to 700 nm at which photosynthesis is promoted in the amount of light absorbed in photosynthesis. Therefore, it is possible to supply the light L2 to the vicinity of the inside of the center of the plant by irradiating the light L2 having the above wavelength from the lower side. Furthermore, since the wavelength of the light L2 is variable, the wavelength can be selectively irradiated according to the growth stage.

  Next, the difference in effect depending on the presence or absence of the lens 13 in the first light source unit 10A will be described with reference to Table 1. Table 1 shows a comparison of the amount of luminous flux that can be irradiated to the plant 21 in the total luminous flux when the first light source unit 10A has the outgoing angle θ = 45 ° and the outgoing angle θ = 60 °. In addition, 10 A of 1st light source units and the planting part 20 are mutually arrange | positioned at a fixed distance, as shown in FIG.

  For example, as shown in Table 1, the amount of light flux that falls within the range of 0 ° to 60 ° with respect to the horizontal direction when the light cultivating apparatus 1A is irradiated with the light L1 using only the LED 11 without using the first light source unit 10A. Furthermore, it becomes 75.0% of the total luminous flux of the light L1. Therefore, the remaining 25.0% of the total luminous flux of the light L1 is an irradiation loss that is not directly applied to the plant 21.

  On the other hand, when the first light source unit 10A in which the exit angle θ of the lens 13 is 60 ° is used, the amount of light flux that falls within the range of 0 ° to 60 ° with respect to the horizontal direction is the total light flux of the light L1. The amount is 95.9%, and the irradiation loss is 4.1%. As a result, by using the first light source unit 10A, when the LED 11 irradiates the same amount of light L1, the plant cultivation device 1A can reduce the irradiation loss, and the light L1, and thus the light L2 with respect to the plant 21. Can be efficiently irradiated.

  The difference in the amount of light flux is not limited to the case where the exit angle θ of the lens 13 is 60 °. For example, the same can be said when the exit angle θ of the lens 13 is 45 °.

[Modification 1]
A modification of the plant cultivation apparatus 1A according to Embodiment 1 of the present invention will be described with reference to FIG. FIG. 5 is a plan view showing a modification of the arrangement relationship between the first light source unit 10A and the planting unit 20 in the plant cultivation apparatus 1A.

  When four plants 21 are arranged in the plant cultivation apparatus 1A, as shown in FIG. 5, the first light source unit 10A is arranged at the center of the four plants 21, and the four plants are arranged. It is preferable that they are installed at the same distance as 21.

  With the above configuration, the first light source unit 10 </ b> A has the same distance from the four planting units 20, so the same amount of light L <b> 2 is applied to the four plants 21 planted in the planting unit 20. can do. As a result, it is possible to prevent a difference in the growth of the plant 21 depending on the plant 21 growth position. Moreover, since the number of 1st light source units 10A required with respect to the some plant 21 can be reduced, it leads to the cost reduction of 1 A of plant cultivation apparatuses. In the present modification, one first light source unit 10A is arranged for four plants 21, but the number of plants 21 for one first light source unit 10A is not limited to the above four. .

[Embodiment 2]
A plant cultivation apparatus 1B according to Embodiment 2 of the present invention will be described with reference to FIG. FIG. 6 is a plan view showing the configuration of the first light source unit 10B of the plant cultivation apparatus 1B according to Embodiment 2 of the present invention.

  In the plant cultivation apparatus 1 </ b> A according to the first embodiment, one LED 11 and a lens 13 are provided on one substrate 12. However, the first light source unit 10B according to the second embodiment is different in that a plurality of LEDs 11 and a plurality of lenses 13 are provided on one substrate 12.

  That is, in the first light source unit 10B of the present embodiment, as shown in FIG. 6, a plurality of light source unit portions 10b having LEDs 11, lenses 13, and pins 14 (not shown) are formed on the same substrate 12. The light source unit portion 10b has the same configuration as that of the first light source unit 10A except for the substrate 12. The light source unit portion 10 b is connected to the substrate 12 by three pins 14. The light source unit portions 10b are arranged on the substrate 12 approximately linearly at equal intervals. Although the said space | interval shall be set suitably, it is preferable that it is about 5 cm, for example. Further, the wiring 12 a is electrically connected to the substrate 12.

  With the above configuration, since the plurality of light source unit portions 10b are arranged on the same substrate 12, the plurality of LEDs 11 can be controlled collectively. For this reason, the uneven growth due to the growing position of the plant 21 can be suppressed over a wide range. As a result, the plant 21 that has grown uniformly can be harvested, so that the evaluation in sorting at the time of shipment can be simplified, and the manufacturing cost can be reduced.

  Next, the arrangement relationship between the first light source unit 10B and the planting unit 20 in the plant cultivation apparatus 1B will be described with reference to FIG. FIG. 7 is a plan view showing an arrangement relationship between the first light source unit 10B and the planting unit 20 in the plant cultivation apparatus 1B.

  The 1st light source unit 10B is installed so that it may correspond with the direction of the some planting part 20 located in a line substantially linearly. That is, the 1st light source unit 10B and the planting part 20 are alternately arrange | positioned in a line toward the same direction.

  With the above configuration, the number of necessary first light source units 10B with respect to the number of plants 21 can be reduced. As a result, it leads to cost reduction of the plant cultivation apparatus 1B.

[Embodiment 3]
Embodiment 3 of the present invention will be described with reference to FIGS. 8 and 9. FIG. 8 is a side view showing a configuration of a plant cultivation apparatus 1C according to Embodiment 3 of the present invention. FIG. 9A is a side view showing the configuration of the second light source unit 30 of the plant cultivation apparatus 1 </ b> C, and FIG. 9B is a front view showing the configuration of the light source unit 31 of the second light source unit 30. .

  In the plant cultivation apparatus 1A of the first embodiment and the plant cultivation apparatus 1B of the second embodiment, artificial light is irradiated from the lower side of the plant 21. On the other hand, 1 C of plant cultivation apparatuses of this Embodiment differ in the point which irradiates artificial light also from the upper side of the plant 21 in addition to artificial light from the lower side of the plant 21. FIG.

  That is, the plant cultivation apparatus 1C of the present embodiment further includes a second light source unit 30 that irradiates the plant 21 with light from above as shown in FIG. The height of the plant cultivation apparatus 1C is appropriately set according to the height of the plant 21, and is, for example, 20 to 50 cm.

(Configuration of the second light source unit 30)
As shown in FIGS. 9A and 9B, the second light source unit 30 includes a light source unit 31, a reflection sheet 32, a light guide plate 33, a prism sheet 34, and a holding member (not shown) that holds them. The light source unit 31 includes a plurality of LEDs 31a, and the LEDs 31a are mounted on the light source unit 31 at equal intervals. The dominant wavelength of the LED 31a is 600 nm to 700 nm and includes other wavelengths. Since the wavelength of 600 nm to 700 nm coincides with the maximum peak wavelength of the photosynthetic absorption spectrum of the plant 21, photosynthesis is promoted. By making the main wavelengths of the first light source unit 10A and the second light source unit 30 600 nm to 700 nm and 400 nm to 450 nm, respectively, the entire plant 21 can be irradiated with light most efficiently, and the growth of the plant 21 can be promoted. It becomes possible. The wavelength is not limited to the above, and it is preferable to set the wavelength appropriately.

  The light emitted from the light source unit 31 enters the light guide plate 33 and repeats total reflection. An ink or a light scattering member is formed on the surface of the light guide plate 33, and the light that enters the portion is emitted out of the light guide plate 33 because the total reflection condition is broken. Of the light emitted to the outside of the light guide plate 33, the light emitted to the reflection sheet 32 side is reflected by the reflection sheet 32 and emitted to the prism sheet 34 side.

  A plurality of triangular prisms, that is, prisms are formed on the surface of the prism sheet 34, and incident light is refracted by the prism and emitted to the side opposite to the light guide plate 33. At this time, more light can be distributed downward, that is, on the side opposite to the light guide plate 33 as compared with the case where the prism sheet 34 is not provided. As a result, the plant 21 on the lower side of the second light source unit 30 can be irradiated with light intensively.

  With the above-described configuration, the second light source unit 30 can irradiate light intensively to the plant 21, and therefore can efficiently irradiate the plant 21 with light compared to the case where a diffusion sheet is used for the light guide plate 33. it can. Furthermore, by mixing light within the light guide plate 33, the plant 21 can be irradiated with light while suppressing unevenness in the amount of light. In addition, the material of the light-guide plate 33 shall be selected suitably, such as polymethyl methacrylate (PMMA), for example, and is not limited.

  In addition, fluorescent lamps that have been conventionally used for irradiating light from the upper side of plants as a light source for plant cultivation devices, because the light source serves as a heat source as it is, leaves and burns of plants are generated by radiant heat, and the light source I couldn't get close to the plant. Therefore, when plant cultivation devices are stacked in the height direction, the position of the upper plant cultivation device is increased, and workability is significantly reduced. Therefore, the number of plants grown per unit area deteriorated, and efficient cultivation could not be performed.

  On the other hand, in the second light source unit 30, only the light source unit 31 provided at the end serves as a heat source, and the light guide plate 33 does not generate heat and does not generate radiant heat. For this reason, since the distance of the light-guide plate 33 and the plant 21 can be shortened, the space saving of a height direction is attained. Moreover, when the plant cultivation apparatus 1C is stacked in multiple layers in the height direction, the overall height can be reduced, and the working efficiency in each layer is improved. As a result, the number of plants grown per unit area is increased, and efficient cultivation can be performed.

  Moreover, although the magnitude | size of the plant cultivation apparatus 1C shall be set suitably, for example, when distribution | distribution is assumed as household plant cultivation apparatus 1C, a vertical x horizontal size is 20 cm x 20 cm to 1 m x 1 m. It is preferable.

[Summary]
Plant cultivation apparatus 1A-1C which concerns on aspect 1 of this invention is a plant cultivation apparatus provided with the planting part 20 which plants a plant, and 1st light source unit 10A * 10B which irradiates light to the said plant, The first light source unit 10A includes a light source unit (LED 11) that emits light, and a lens unit that directs light emitted above the light source unit (LED 11) in a direction other than the vertical direction. Lens 13), and disposed at a position away from the planting portion 20 in the horizontal direction.

  With the above configuration, the first light source unit can direct light emitted vertically upward from the light source unit in a direction other than vertically upward, and can irradiate the plant with light from the first light source unit. As a result, the plant can be directly irradiated with light efficiently from the lower side to the side surface. Moreover, since the 1st light source unit is arrange | positioned in the position away from the planting part in the horizontal direction, the damage to the plant by the heat from a light source part can be prevented. Furthermore, by irradiating the emitted light from the lower side of the plant, the growth of the plant is advantageous as compared to the irradiation by only the light from the upper side. Therefore, the plant cultivation apparatus which irradiates light efficiently from the downward side with respect to a plant can be provided.

  The plant cultivation apparatuses 1A to 1B according to aspect 2 of the present invention are the above aspect 1, wherein the planting unit 20 is provided in a plurality, and at least the first light source units 10A and 10B are provided. It is preferable that 1st light source unit 10A * 10B is arrange | positioned in the position where the distance from the said two planting parts 20 is equal.

  With the above configuration, the first light source units have the same distance from the plurality of planting units, and thus can irradiate the plurality of plants with the same amount of light. As a result, it is possible to prevent differences in plant growth due to plant growth positions. Moreover, since the number of 1st light source units required with respect to several plants can be reduced, it leads to the cost reduction of a plant cultivation apparatus.

  In the plant cultivation apparatus 1B according to aspect 3 of the present invention, in the above aspect 2, it is preferable that the planting unit 20 and the first light source unit 10B are alternately arranged in a row in the same direction.

  With the above configuration, since the planting units and the first light source units are alternately arranged in a row in the same direction, the number of necessary first light source units with respect to the number of plants can be reduced. Therefore, it leads to the cost reduction of a plant cultivation apparatus.

  The plant cultivation apparatuses 1A to 1C according to aspect 4 of the present invention are the above-described aspects 1 to 3, in which the angle formed by the light having the highest light intensity and the horizontal direction is the light emitted from the first light source unit 10A. It is preferable that it is 60 degrees or less.

  By the said structure, since the angle which the light intensity | strength and the horizontal direction make is 60 degrees or less, it is efficiently with respect to the plant arrange | positioned so that plants may not contact even if it grows up Light can be irradiated from the lower side. Therefore, the loss of light irradiated from the first light source unit can be reduced, that is, the light not irradiated on the plant can be reduced, so that the light can be efficiently irradiated on the plant.

  It is preferable that 1 C of plant cultivation apparatuses which concern on aspect 5 of this invention are further provided with the 2nd light source unit 30 which irradiates light from the said plant upper side in the said aspects 1-4.

  With the above configuration, since the second light source unit is provided on the upper side of the plant, the plant can be irradiated with light from the upper side and the lower side. Therefore, it is possible to irradiate the plant with light without variation.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention. Furthermore, a new technical feature can be formed by combining the technical means disclosed in each embodiment.

  The present invention can be used for a plant cultivation apparatus for cultivating plants.

DESCRIPTION OF SYMBOLS 1A Plant cultivation apparatus 1B Plant cultivation apparatus 1C Plant cultivation apparatus 10A 1st light source unit 10B 1st light source unit 10b Light source unit part 11 LED (light source part)
12 Substrate 12a Wiring 13 Lens (Lens part)
13a Light incident surface 13b Light emitting surface 14 Pin 15 Gap 20 Planting part 21 Plant 30 Second light source unit 31 Light source part 31a LED
32 Reflective sheet 33 Light guide plate 34 Prism sheet θ Emission angle D1, D2 Distance L1, L2 Light

Claims (5)

A plant cultivation device comprising a planting part for planting a plant and a first light source unit for irradiating the plant with light,
The first light source unit includes:
A light source unit that emits light, and a lens unit that directs light emitted above the light source unit vertically above the light source unit in a direction other than the vertical upper side,
A plant cultivation device, wherein the plant cultivation device is disposed at a position away from the planting portion in the horizontal direction. A plurality of the planting parts are provided, and at least one first light source unit is provided,
2. The plant cultivation apparatus according to claim 1, wherein each first light source unit is arranged at a position where the distance from at least two planting parts is equal.   The plant cultivation device according to claim 2, wherein the planting unit and the first light source unit are alternately arranged in a row in the same direction.   4. The angle according to claim 1, wherein an angle formed by light having the highest light intensity among the light emitted from the first light source unit and the horizontal direction is 60 ° or less. 5. Plant cultivation equipment.   The plant cultivation apparatus according to any one of claims 1 to 4, further comprising a second light source unit that irradiates light from an upper side of the plant.

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