Light irradiation device for plant

Abstract

To provide a technique of detecting an abnormality of a plant and irradiating the plant with light corresponding to the abnormality of the plant.SOLUTION: A light irradiation device for a plant includes a detection unit, an irradiation unit, and a control unit. The detection unit detects a smell component emitted from a plant. The irradiation unit irradiates the plant with light. The control unit controls the light emitted by the irradiation unit on the basis of the smell component detected by the detection unit.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a light irradiation device for plants. [Background technology]

[0002] Patent Document 1 discloses a pest control device. This pest control device includes a laser oscillator and a camera for grasping the position where the laser beam emitted from the laser oscillator is focused. The position of the pest is identified by the camera, and the pest is irradiated with the laser beam. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2001-275541 A Summary of the Invention [Problem to be solved by the invention]

[0004] The pest control device described in Patent Document 1 cannot respond to various abnormalities that occur in plants other than controlling pests by irradiating them with a laser beam. The present disclosure provides a technology for detecting abnormalities in plants and irradiating the plants with light corresponding to the abnormalities. [Means for solving the problem]

[0005] A plant light irradiating device according to one aspect of the present disclosure includes a detection unit, an irradiation unit, and a control unit. The detection unit detects odor components emitted from the plant. The irradiation unit irradiates the plant with light. The control unit controls the light irradiated by the irradiation unit based on the odor components detected by the detection unit. Effect of the Invention

[0006] According to the present disclosure, abnormalities in plants can be detected and light corresponding to the abnormalities in the plants can be irradiated onto the plants. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a diagram showing the appearance of an optical device according to an embodiment. [Diagram 2] Fig. 2A is a diagram showing a cross-sectional configuration of an optical device according to an embodiment, and Fig. 2B is a block diagram of the optical device according to an embodiment. [Diagram 3] Fig. 3A is a front view of the optical device according to the embodiment, and Fig. 3B is a top view of the optical device according to the embodiment. [Figure 4] Fig. 4(A) is a diagram showing a cross-sectional configuration of an optical device according to another embodiment. Fig. 4(B) is a diagram showing a cross-sectional configuration of an optical device according to yet another embodiment. Fig. 4(C) is a diagram showing a cross-sectional configuration of an optical device according to yet another embodiment. [Diagram 5] FIG. 5 is a block diagram of an optical device according to yet another embodiment. [Figure 6] FIG. 6 is a flowchart of the light irradiation method according to the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] [Examples of the embodiments of the present disclosure] Hereinafter, an embodiment of the present disclosure will be described in detail with reference to the drawings. In the description of the drawings, the same elements are given the same reference numerals, and duplicated description will be omitted. The dimensional ratio of the drawings does not necessarily match that of the description. The terms "upper", "lower", "left" and "right" are based on the illustrated state and are for convenience.

[0009] FIG. 1 is a diagram showing the appearance of a light device according to an embodiment. A light device 1 (an example of a light irradiation device for plants) irradiates light to a plant P. In the example of FIG. 1, the light device 1 irradiates light to a leaf L of the plant P. In one example, the plant P is cultivated in a facility such as a vinyl house. As shown in FIG. 1, the light device 1 is placed near the plant P. In the example shown in FIG. 1, a plurality of light devices are placed for one plant P, but one light device may be placed for one plant P. The light device 1 may be capable of communicating with a terminal 2 prepared separately from the light device 1. In one example, the terminal 2 is a stationary or portable computer. The portable computer is, for example, a notebook computer, a tablet terminal, a smartphone, or the like.

[0010] Fig. 2A is a diagram showing a cross-sectional configuration of an optical device according to an embodiment. Fig. 2B is a block diagram of an optical device according to an embodiment. As shown in Fig. 2B, the optical device 1 includes, as an example, a detection unit 10, an irradiation unit 20, an amplifier 23, a control unit 30, a storage unit 31, and a communication unit 32. The optical device 1 further includes at least one substrate 4. In an example, the detection unit 10, the irradiation unit 20, the amplifier 23, the control unit 30, the storage unit 31, and the communication unit 32 are electronic components mounted on at least one substrate 4.

[0011] The detection unit 10 detects odor components emitted from the plant P. The odor components emitted from the plant P may include terpenes, a green scent, and volatile sulfur compounds. The detection unit 10 may include a plurality of detection elements for detecting each of the terpenes, the green scent, and hydrogen sulfide. For example, the detection unit 10 may be a gas sensor of a semiconductor type, an electrochemical type, a quartz crystal type, or the like. In one example, the detection unit 10 includes a sensitive film made of a conductive polymer and a tin oxide (SnO 2 The VOC sensor includes an oxide semiconductor such as ZnO. The sensitive film is made of, for example, polyaniline. The detection unit 10 detects the type and concentration of an odor component. The detection unit 10 outputs information on the detected odor component to the control unit 30.

[0012] In one example, the sensitive membrane of a detection element that detects terpenes among the multiple detection elements included in the detection unit 10 may be made of a lipophilic conductive polymer. When the sensitive membrane is made of a lipophilic conductive polymer, terpenes are easily absorbed by the sensitive membrane, and the sensitivity of the detection unit 10 to terpenes is improved. In one example, the sensitive membrane of a detection element that detects a green scent among the multiple detection elements included in the detection unit 10 may be made of a hydrophilic conductive polymer. When the sensitive membrane is made of a hydrophilic conductive polymer, components of the green scent are easily absorbed by the sensitive membrane, and the sensitivity of the detection unit 10 to the green scent is improved.

[0013] Terpenes are (C 5 H 8 ) n The green scent is a volatile substance such as an aldehyde, alcohol, and their esters, which have a skeleton of six carbon atoms. For example, the green scent is released from plants to repair damaged cell walls. Specifically, the green scent is hexenol (green leaf alcohol) and hexenal (green leaf aldehyde). The green scent is released from plants P that have been damaged by pests or other insects. The volatile sulfur compounds are substances such as methyl mercaptan and dimethyl sulfide. The volatile sulfur compounds are released from plants P that have been rotten due to disease or other reasons.

[0014] The irradiation unit 20 irradiates the plant P with light. The light includes at least one of infrared light, visible light, and ultraviolet light. The infrared light has a wavelength of 760 nm or more and 1000 nm or less. The visible light has a wavelength of 360 nm or more and 830 nm or less. The ultraviolet light has a wavelength of 10 nm or more and 400 nm or less. The ultraviolet light may include mid-wavelength ultraviolet light having a wavelength of 280 nm or more and 320 nm or less. The irradiation unit 20 may include light-emitting elements corresponding to the respective wavelengths of infrared light, visible light, and ultraviolet light. For example, the irradiation unit 20 may be composed of a light-emitting element corresponding to any one of infrared light, visible light, and ultraviolet light. The irradiation unit 20 may be composed of a light-emitting element corresponding to any two of infrared light, visible light, and ultraviolet light. The irradiation unit 20 may be composed of a light-emitting element corresponding to each of infrared light, visible light, and ultraviolet light. As an example, the irradiation unit 20 includes a first light-emitting element 21 and a second light-emitting element 22. The first light-emitting element 21 irradiates ultraviolet light. The first light-emitting element 21 may irradiate medium-wavelength ultraviolet light. The second light-emitting element 22 irradiates visible light. The irradiation unit 20 may include an amplifier 23. Power is supplied to the irradiation unit 20 from the amplifier 23. The intensity of the light irradiated by the irradiation unit 20 increases or decreases depending on the power supplied from the amplifier 23. For example, the irradiation unit 20 is an LED (light-emitting diode). The first light-emitting element 21 and the second light-emitting element 22 may be different LEDs. The amplifier 23 may be an operational amplifier.

[0015] The control unit 30 controls the irradiation unit 20 based on the odor components detected by the detection unit 10. For example, the control unit 30 controls the light irradiated by the irradiation unit 20 by controlling the power supplied from the amplifier 23 to the irradiation unit 20. The control unit 30 can control the on / off operation of the light irradiated by the irradiation unit 20. When the detection unit 10 detects an odor component, the control unit 30 may control the irradiation unit 20 to start irradiating the plant P with light. When the detection unit 10 does not detect an odor component, the control unit 30 may control the irradiation unit 20 to stop irradiating the plant P with light. The control unit 30 is, for example, a processor such as a CPU (Central Processing Unit) or an FPGA (Field-Programmable Gate Array).

[0016] The control unit 30 controls the light intensity, the light wavelength, and the light irradiation time based on the type of odor component and the concentration of the odor component. The type of odor component is the type of detection target that the detection unit 10 can identify, such as a green scent, terpenes, or hydrogen sulfide. The concentration of the odor component is the amount of the odor component per unit volume in the atmosphere. In one example, the concentration of the odor component is expressed as ppm (parts per million).

[0017] Light intensity is the energy per unit area of ​​light irradiated on the plant P. In one example, light intensity is expressed in W / cm 2 Controlling the wavelength of light means controlling the irradiation unit 20 to irradiate infrared light, visible light, or ultraviolet light. The control unit 30 can control the wavelength of the light irradiated by the irradiation unit 20 to be 10 nm or more and 400 nm or less by causing the first light-emitting element 21 to irradiate ultraviolet light. The control unit 30 can control the wavelength of the light irradiated by the irradiation unit 20 to be 360 ​​nm or more and 830 nm or less by causing the second light-emitting element 22 to irradiate visible light.

[0018] In one example, the control unit 30 controls the light by referring to a table in which the type and concentration of the odor component correspond to the light intensity, the light wavelength, and the light irradiation time. For example, when the detection unit 10 detects terpenes and detects that the concentration of the terpenes is increasing and / or that the concentration of the terpenes is higher than a predetermined threshold, the control unit 30 controls the first light-emitting element 21 of the irradiation unit 20 to irradiate ultraviolet light. In this case, the control unit 30 may control the irradiation to irradiate medium-wavelength ultraviolet light having a wavelength of 280 nm or more and 320 nm or less.

[0019] For example, when the detection unit 10 detects a green scent and detects that the concentration of the green scent is increasing and / or that the concentration of the green scent is higher than a predetermined threshold, the control unit 30 controls the second light-emitting element 22 of the irradiation unit 20 to irradiate visible light. In this case, the control unit 30 controls the intensity of the visible light to 100 W / cm 2 The following control may be performed.

[0020] For example, when the detection unit 10 detects volatile sulfur compounds and detects that the concentration of the volatile sulfur compounds is increasing and / or that the concentration of the volatile sulfur compounds is higher than a predetermined threshold, the control unit 30 controls the first light-emitting element 21 of the irradiation unit 20 to irradiate ultraviolet light. In this case, the control unit 30 may control the irradiation unit 20 to irradiate medium-wavelength ultraviolet light having a wavelength of 280 nm or more and 320 nm or less.

[0021] The control unit 30 can control the light intensity and / or the light irradiation time by controlling the amplifier 23. For example, when the detection unit 10 detects that the concentration of the odor component is increasing and / or that the concentration of the odor component is higher than a predetermined threshold, the control unit 30 controls the irradiation unit 20 to increase the light intensity and / or the light irradiation time. For example, when the detection unit 10 detects that the concentration of the odor component is decreasing and / or that the concentration of the odor component is lower than a predetermined threshold, the control unit 30 controls the irradiation unit 20 to decrease the light intensity or the light irradiation time.

[0022] The storage unit 31 stores types of odor components and wavelengths of light corresponding to the types of odor components. The storage unit 31 may store a table in which types of odor components correspond to wavelengths of light. The control unit 30 may control the wavelength of light by referring to the storage unit 31. In one example, the storage unit 31 is a memory such as a RAM (Random Access Memory) and a ROM (Read Only Memory). The storage unit 31 may be included in the control unit 30.

[0023] For example, the memory unit 31 may store terpenes or volatile sulfur components and ultraviolet light corresponding to the terpenes or volatile sulfur components. When the detection unit 10 detects terpenes or volatile sulfur components, the control unit 30 may refer to the memory unit 31 and control the wavelength of the light to 10 nm or more and 400 nm or less. For example, the memory unit 31 may store a green scent and visible light corresponding to the green scent. When the detection unit 10 detects a green scent, the control unit 30 may refer to the memory unit 31 and control the wavelength of the light to 360 nm or more and 830 nm or less.

[0024] The memory unit 31 newly stores the type of odor component and the wavelength of light corresponding to the type of odor component. For example, the memory unit 31 can newly store the odor component emitted from the plant P when an abnormality other than disease, injury, or decay occurs in the plant P, and the wavelength of light corresponding to the other abnormality. By including the memory unit 31, the light device 1 can irradiate the new abnormality that has occurred in the plant with light of a wavelength corresponding to the abnormality.

[0025] The memory unit 31 stores the relationship between the concentration of the odorous component and the light intensity and / or the light irradiation time controlled in response to the concentration of the odorous component. The control unit 30 controls the light intensity and / or the light irradiation time by referring to the memory unit 31. The memory unit 31 can newly store the relationship between the concentration of the odorous component and the light intensity and / or the light irradiation time controlled in response to the concentration of the odorous component according to the environment. The environment refers to the environment related to the growth of the plant P, such as the weather, season, and the prevalence of pests and diseases.

[0026] The storage unit 31 may store a history of the control performed by the control unit 30. For example, the storage unit 31 stores an increase in the light intensity and / or the light irradiation time in association with a decrease in the concentration of the odor component and / or the concentration of the odor component dropping below a predetermined threshold. For example, the storage unit 31 stores an increase in the light intensity and / or the light irradiation time in association with an increase in the concentration of the odor component and / or the concentration of the odor component rising above a predetermined threshold. The control unit 30 controls the light intensity and / or the light irradiation time by referring to the storage unit 31. For example, the control unit 30 controls the light intensity and / or the light irradiation time to decrease after decreasing the concentration of the odor component by referring to the storage unit 31.

[0027] The communication unit 32 can transmit information output from the control unit 30 to the external terminal 2. The communication unit 32 can output information output from the external terminal 2 to the control unit 30. For example, the communication unit 32 may transmit information stored by the memory unit 31 to the terminal 2 via the control unit 30. The memory unit 31 may store information output from the terminal 2 via the communication unit 32. A table in which the types of odor components and the wavelengths of light correspond to each other, which is stored in the memory unit 31, can be input and / or output via the communication unit 32. A relationship between the concentration of an odor component and the intensity of light and / or the irradiation time of light controlled in response to the concentration of the odor component, which is stored in the memory unit 31, can be input and / or output via the communication unit 32.

[0028] As shown in FIG. 2A, the light device 1 further includes a housing 5. The housing 5 defines a gas chamber 5a therein. An intake section 5b and an exhaust section 5c are formed in the housing 5. The intake section 5b and the exhaust section 5c are each connected to the gas chamber 5a. The intake section 5b, the gas chamber 5a, and the exhaust section 5c are aligned in one direction. A gas introduction section 3 may be disposed in the intake section 5b. The gas introduction section 3 introduces odor components into the gas chamber 5a. The gas introduction section 3 is, for example, a pump, a compressor, or a blower. The odor components introduced into the gas chamber 5a are exhausted from the exhaust section 5c.

[0029] As shown in (A) of FIG. 2, the optical device 1 further includes a first substrate 41 and a second substrate 42. At least one substrate 4 is composed of the first substrate 41 and the second substrate 42. The detection unit 10 is disposed on the first substrate 41. The irradiation unit 20 is disposed on the second substrate 42. The first substrate 41 may be disposed in the gas chamber 5a. The second substrate 42 may be disposed on the surface of the housing 5 so as to face the first substrate 41. The first substrate 41 and the second substrate 42 are communicatively connected to each other. In the example shown in (A) of FIG. 2, the first substrate 41 and the second substrate 42 are connected to each other via a connector 43. The first substrate 41 and the second substrate 42 may be connected to each other via a cable or may be connected to each other via a wireless communication device. In one example, the wireless communication device performs short-range wireless communication in the 2.4 GHz band.

[0030] FIG. 3A is a front view of the plant light irradiation device according to the embodiment. FIG. 3B is a top view of the plant light irradiation device according to the embodiment. As shown in FIG. 3A and FIG. 3B, the housing 5 includes an attachment portion 51. The attachment portion 51 is attached to the plant P. In one example, the attachment portion 51 is composed of a pair of plate-shaped members facing each other. The plant P is attached between the pair of plate-shaped members. For example, the stem of the plant P may be sandwiched between the pair of plate-shaped members. In the housing 5, the attachment portion 51 is provided so that the axial direction of the light irradiated by the irradiation portion 20 and the axial direction of the stem of the plant P are aligned with each other. By including the attachment portion 51, the light device 1 can irradiate light from below the plant P. As a result, the light device 1 can irradiate light to the back of the leaves L of the plant P, which are prone to pests and diseases. Since the light device 1 can be disposed close to the plant P by the attachment portion 51, the light device 1 can efficiently irradiate light to the plant P. As a result, the optical device 1 can reduce power consumption and limit the light output.

[0031] The housing 5 includes a hanging part 52. A through hole 52a is formed in the hanging part 52. As shown in Fig. 1, a wire is hung on the through hole 52a of the hanging part 52, so that the entire lighting device 1 is suspended. In the housing 5, the hanging part 52 is disposed on the opposite side to the irradiation part 20. By including the hanging part 52, the lighting device 1 can irradiate the plant P with light from above.

[0032] Fig. 4(A) is a diagram showing a cross-sectional configuration of a plant light irradiating device according to another embodiment. Fig. 4(B) is a diagram showing a cross-sectional configuration of a plant light irradiating device according to yet another embodiment. Fig. 4(C) is a diagram showing a cross-sectional configuration of a plant light irradiating device according to yet another embodiment. Hereinafter, with reference to Fig. 4(A) to Fig. 4(C), differences between the light device 1 and the light devices 1A, 1B, and 1C shown in Fig. 4(A) to Fig. 4(C) will be mainly described.

[0033] As shown in FIG. 4A, the optical device 1A includes a substrate 4A and a housing 5A instead of at least one of the substrate 4 and housing 5. The substrate 4A is a single substrate. The housing 5A has an opening 5d that communicates with the gas chamber 5a. The substrate 4A is arranged so as to cover the opening 5d. A detection unit 10 is arranged on the surface of the substrate 4A facing the gas chamber 5a. An irradiation unit 20 is arranged on the surface of the substrate 4A facing away from the gas chamber 5a. The other configurations of the optical device 1A are the same as those of the optical device 1. In the optical device 1A, the detection unit 10 and the irradiation unit 20 are arranged on the single substrate 4A, so that the optical device 1A can be easily provided.

[0034] As shown in FIG. 4B, the optical device 1B includes a housing 5B instead of the housing 5. In the housing 5B, the intake section 5b, the gas chamber 5a, and the exhaust section 5c are not aligned in one direction. In the housing 5B, a flow path 5e communicating with the gas chamber 5a is formed between the intake section 5b and the exhaust section 5c. The flow path 5e is formed to face the detection section 10 across the gas chamber 5a. In the housing 5B, the intake section 5b and the exhaust section 5c are aligned in one direction, and the intake section 5b and the exhaust section 5c and the gas chamber 5a are aligned in a direction perpendicular to the direction in which the intake section 5b and the exhaust section 5c are aligned. The housing 5B includes a filter 53. The filter 53 is disposed in the flow path 5e. The filter 53 removes dust and the like that is about to enter the gas chamber 5a from the flow path 5e. The other configurations of the optical device 1B are the same as those of the optical device 1.

[0035] As shown in FIG. 4C, the optical device 1C includes a housing 5C instead of the housing 5. In the housing 5C, the intake section 5b includes a first portion that communicates with the outside and extends in one direction, and a second portion that communicates with the gas chamber and extends in a direction perpendicular to the one direction. The second portion is formed to face the detection section 10 with the gas chamber 5a in between. The housing 5C includes a filter 53. The filter 53 is disposed in the second portion. The other configurations of the optical device 1C are the same as those of the optical device 1.

[0036] Fig. 5 is a block diagram of a plant light irradiating device according to still another embodiment of the present invention. A light device 1D shown in Fig. 5 will be described, focusing on the differences from the light device 1.

[0037] The optical device 1D includes at least one first board 41D and at least one second board 42D instead of the first board 41 and the second board 42. In the optical device 1D, the control unit 30 and the memory unit 31 are configured from the control unit and the memory unit of the terminal 2. The first board 41D may be disposed in the housing 6. The second board 42D may be disposed in a housing 7 different from the housing 6. The terminal 2 includes the control unit 30, the memory unit 31, and the communication unit 32. The detection unit 10 and the communication unit 32 are disposed on the first board 41D. The control unit 30 and the memory unit 31 may not be disposed on the first board 41D. The detection unit 10 and the communication unit 32 are disposed on the second board 42D. The control unit 30 and the memory unit 31 may not be disposed on the second board 42D. The first substrate 41D, the second substrate 42D, and the terminal 2 configure an optical device 1D by communication between the communication unit 32 of the first substrate 41D, the communication unit 32 of the terminal 2, and the communication unit 32 of the second substrate 42D.

[0038] In the light device 1D, the first substrate 41D on which the detection unit 10 is arranged can be arranged closer to the plant P than the second substrate 42D on which the irradiation unit 20 is arranged. Therefore, the light device 1D can detect odor components with higher accuracy. There may be a plurality of second substrates 42D, and the number of the second substrates 42D may be greater than the number of the first substrates 41D. In one example, one first substrate 41D and multiple second substrates 42D may be arranged for one plant P.

[0039] FIG. 6 is a flowchart of a light irradiation method according to an embodiment. The light irradiation method M is an example of a light irradiation method for plants. In the light irradiation method M, first, an odor component emitted from the plant P is detected (step S10). In step S10, at least one of the type of odor component and the concentration of the odor component may be detected. Next, based on the detected odor component of the plant P, the light to be irradiated is determined (step S20). In step S20, at least one of the light intensity, the light wavelength, and the light irradiation time may be determined based on at least one of the type of odor component and the concentration of the odor component. Finally, the determined light is irradiated to the plant P (step S30).

[0040] Although various exemplary embodiments have been described above, the present disclosure is not limited to the above-described embodiments, and various omissions, substitutions, and modifications may be made.

[0041] The type of plant P and the cultivation location are not limited to those shown in FIG. 1, and the light device can be used for any type of plant and cultivation location. The light device may include an acceleration sensor. The acceleration sensor detects the inclination of the light device relative to the vertical direction. The light device may include a drive unit that changes the direction of the light irradiated by the irradiation unit. The control unit 30 may change the direction of the light irradiated by the irradiation unit by referring to the memory unit 31. The light device may include a temperature sensor and may include a humidity sensor. The memory unit 31 may store the temperature detected by the temperature sensor and the humidity detected by the humidity sensor in association with the odor components emitted from the plant P and the light irradiated to the plant P. The light device may include a battery, a socket that can supply power from an external source, or a wireless charger.

[0042] When the detection unit detects terpenes, the control unit may control the wavelength of the light irradiated by the irradiation unit to be 360 ​​nm or more and 830 nm or less. The detection unit may not detect the type of odor component. The control unit may irradiate the plant P with both ultraviolet light and visible light regardless of the type of odor component.

[0043] [Modes included in this disclosure] The present disclosure includes the aspects described in the following clauses.

[0044] (Clause 1) A plant light irradiation device according to one aspect of the present disclosure includes a detection unit that detects odor components emitted from a plant, an irradiation unit that irradiates light to the plant, and a control unit that controls the light irradiated by the irradiation unit based on the odor components detected by the detection unit.

[0045] The inventors have focused on the fact that plants emit various odor components according to their condition. Plants emit odor components according to their abnormality. The plant light irradiating device described in clause 1 controls the light irradiated to the plant based on the odor components detected by the detection unit, so that it can irradiate light corresponding to the abnormality of the plant estimated from the odor components.

[0046] (Clause 2) In the plant light irradiating device described in clause 1, the detection unit may detect at least one of the type and concentration of the odorous component, and the control unit may control at least one of the intensity, wavelength, and irradiation time of the light based on at least one of the type and concentration of the odorous component. Since this plant light irradiating device detects at least one of the type and concentration of the odorous component, abnormalities in the plant can be estimated with high accuracy. Since this plant light irradiating device controls at least one of the intensity, wavelength, and irradiation time of the light irradiated to the plant, light can be finely controlled in response to abnormalities in the plant. The control unit controls the light intensity to 100 W / cm 2 It may be controlled to less than 100W / cm 2 When the light irradiation device for plants irradiates the plants with the following intensity, the light irradiation device for plants is unlikely to be invasive to the plants.

[0047] (Clause 3) In the plant light irradiating device described in clause 2, the control unit may control the wavelength of the light based on the type of the odor component. Since this plant light irradiating device detects the type of odor component, it is possible to estimate the abnormality of the plant with higher accuracy. Since this plant light irradiating device controls the wavelength of the light irradiated to the plant, it is possible to control the characteristics of the light in response to the abnormality of the plant.

[0048] (Clause 4) In the plant light irradiation device described in clause 3, when the detection unit detects terpenes, the control unit may control the wavelength of the light irradiated by the irradiation unit to be 10 nm or more and 400 nm or less. Terpenes are antibacterial substances released by plants against diseases such as mold. Light having a wavelength of 10 nm or more and 400 nm or less is ultraviolet light. This plant light irradiation device can suppress the occurrence of diseases such as mold in plants by irradiating ultraviolet light. The control unit may control the wavelength of the ultraviolet light to be 280 nm or more and 320 nm or less. Ultraviolet light having a wavelength of 280 nm or more and 320 nm or less is medium wavelength ultraviolet light. Medium wavelength ultraviolet light can further suppress the occurrence of diseases such as mold in plants.

[0049] (Clause 5) In the plant light irradiation device described in clause 3 or 4, when the detection unit detects a green scent component, the control unit may control the wavelength of the light irradiated by the irradiation unit to 360 nm or more and 830 nm or less. The green scent is a general term for volatile compounds such as aldehydes (e.g., green leaf aldehyde), alcohols (e.g., green leaf alcohol), and esters having six carbon atoms emitted from plants. The green scent is emitted from plants damaged by pests or diseases. Light with a wavelength of 360 nm or more and 830 nm or less is visible light. Pests do not like to be irradiated with visible light. This plant light irradiation device can suppress pests from attaching to plants by irradiating visible light.

[0050] (Clause 6) The plant light irradiating device described in any one of clauses 2 to 5 further includes a storage unit that stores the type of the odor component and the wavelength of the light corresponding to the type of the odor component, and the control unit may control the wavelength of the light by referring to the storage unit. In this plant light irradiating device, the wavelength of the light controlled in response to the type of the odor component is stored in the storage unit. Therefore, the wavelength of the light controlled in response to the type of the odor component can be controlled according to the contents stored in the storage unit.

[0051] (Clause 7) In the plant light irradiating device described in clause 6, the memory unit may store a relationship between the concentration of the odor component and at least one of the intensity and irradiation time of the light controlled in response to the concentration of the odor component, and the control unit may control the at least one of the intensity and irradiation time of the light by referring to the memory unit. In this plant light irradiating device, the intensity and irradiation time of the light controlled in response to the concentration of the odor component are stored in the memory unit. Therefore, the intensity and irradiation time of the light controlled in response to the concentration of the odor component can be controlled according to the contents stored in the memory unit.

[0052] The plant light irradiating device according to any one of clauses 1 to 7 may further include a housing including an attachment part attached to the plant and defining a gas chamber into which the odor component is introduced and the detection part is arranged, a first board on which the detection part is arranged, and a second board on which the irradiation part is arranged. In this plant light irradiating device, the detection part is arranged in the gas chamber. Therefore, the influence of an increase or decrease in the odor component due to an external air flow or the like is unlikely to occur. This plant light irradiating device is attached adjacent to the plant by the attachment part. Therefore, the attenuation of light between the plant and the irradiation part can be reduced. In this plant light irradiating device, the first board on which the detection part is arranged and the second board on which the irradiation part is arranged are separate bodies, so that the detection part and the irradiation part can be arranged separately. [Explanation of symbols]

[0053] 1, 1A, 1B, 1C, 1D...optical device, 4, 4A...board, 5, 5A, 5B, 5C...housing, 5a...gas chamber, 10...detection unit, 20...irradiation unit, 30...control unit, 31...memory unit, 41, 41D...first board, 42, 42D...second board, 51...mounting unit, P...plant.

Claims

1. A detection unit that detects odor components emitted from plants; An irradiation unit that irradiates light to the plant; A control unit that controls the light irradiated by the irradiation unit based on the odor component detected by the detection unit; A light irradiation device for plants comprising:

2. The detection unit detects at least one of the type and concentration of the odor component, The control unit controls at least one of the intensity, wavelength, and irradiation time of the light based on at least one of the type and concentration of the odor component. The plant light irradiation device according to claim 1 .

3. The control unit controls the wavelength of the light based on the type of the odor component. The plant light irradiation device according to claim 2 .

4. When the detection unit detects terpenes, the control unit controls the wavelength of the light irradiated by the irradiation unit to be 10 nm or more and 400 nm or less. The plant light irradiation device according to claim 3 .

5. When the detection unit detects a green aroma component, the control unit controls the wavelength of the light irradiated by the irradiation unit to be 360 ​​nm or more and 830 nm or less. The plant light irradiation device according to claim 3 .

6. Further comprising a storage unit that stores the type of the odor component and the wavelength of the light corresponding to the type of the odor component, The control unit controls the wavelength of the light by referring to the storage unit. The plant light irradiation device according to claim 2 .

7. The memory unit stores a relationship between the concentration of the odor component and at least one of the intensity and irradiation time of the light that are controlled in response to the concentration of the odor component; The control unit controls at least one of the intensity and the irradiation time of the light by referring to the storage unit. The plant light irradiation device according to claim 6.

8. A housing including an attachment part to be attached to the plant and defining a gas chamber into which the odor component is introduced and into which the detection part is disposed; A first substrate on which the detection unit is disposed; A second substrate on which the irradiation unit is disposed; Further comprising: The plant light irradiation device according to any one of claims 1 to 7.

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