Support structure and system

Abstract

This support structure is for disposing an acquisition unit that acquires information regarding the condition of a plant leaf or the surrounding environment near the leaf, wherein the support structure comprises a support body that supports the acquisition unit and a fixing part that fixes the support body to the plant, and the support body is fixed by the fixing part in a state of extending from the back side of the leaf to the branch or trunk of the plant so that the acquisition unit is disposed not on the front side of the leaf but on the back side of the leaf.

Description

Technical Field

[0001] The present invention relates to a support structure and system. The present invention claims priority based on Japanese Patent Application No. 2022-109088 filed in Japan on July 6, 2022, the content of which is incorporated herein by reference.

Background Art

[0002] Techniques for measuring and detecting real-time physiological changes in plants enable efficient remote observation such as crop cultivation management in the agricultural field and environmental measurement in inaccessible areas such as forests. For long-term observation of plant leaves, it is important not to damage the leaves, not to inhibit physiological responses such as photosynthesis, and the robustness of the mounting ability of the observation device. For example, Patent Document 1 discloses a plant sensing device that is attached to a plant leaf to acquire a contact image of the leaf surface. This plant sensing device includes a light source part having a surface-emitting light source, a sensor part having an image sensor and a fiber optic plate (FOP) disposed on the imaging surface thereof, and a part fixing means for pressing both parts against the surface of the plant leaf with the light-emitting surface of the light source of the light source part and the surface of the FOP of the sensor part facing each other across the plant leaf to fix them to the plant leaf.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, since both parts are fixed with the plant leaf sandwiched therebetween, a structure is also provided on the surface side of the leaf. Therefore, in long-term observation of plant leaves, there is a high possibility that the leaves are damaged or physiological responses such as photosynthesis are inhibited.

[0005] The present invention has been made to solve the above problems, and aims to provide a support structure and system that can suppress damage to plant leaves and inhibition of photosynthesis during long-term observation of plant leaves, while also maintaining robustness in terms of attachment capacity. [Means for solving the problem]

[0006] As a means of solving the above problems, an embodiment of the present invention has the following configuration. (1) A support structure according to an aspect of the present invention is a structure for positioning an acquisition unit that acquires information about the state of a plant leaf or the surrounding environment near the leaf, comprising a support body that supports the acquisition unit and a fixing unit that fixes the support body to the plant, wherein the support body is fixed by the fixing unit in a state that extends from the underside of the leaf to the branch or trunk of the plant, such that the acquisition unit is positioned on the underside of the leaf rather than the surface of the leaf.

[0007] With this configuration, the acquisition part is positioned on the underside of the leaf rather than the upper surface, eliminating the need to provide a structure on the upper surface of the leaf. Therefore, it is possible to suppress damage to the leaf or inhibition of photosynthesis during long-term observation of plant leaves. In addition, since the support that holds the acquisition part is fixed by the fixing part while extending from the underside of the leaf to the branch or trunk of the plant, the robustness of the attachment capability can be maintained. Thus, it is possible to provide a support structure that suppresses damage to the leaf or inhibition of photosynthesis during long-term observation of plant leaves, while also maintaining the robustness of the attachment capability.

[0008] (2) In the support structure described in (1) above, the support may have elasticity.

[0009] (3) In the support structure described in (1) or (2) above, a plurality of acquisition parts may be provided, and the plurality of acquisition parts may be fixed to the support at different positions in a location that overlaps with the leaf.

[0010] (4) In the support structure described in any one of the above paragraphs (1) to (3), the support body extends from a place overlapping with the leaf to a place not overlapping with the leaf, and a plurality of acquisition parts are provided, and the plurality of acquisition parts may include a leaf-side acquisition part fixed to the support body at a place overlapping with the leaf, and an outer acquisition part fixed to the support body at a place not overlapping with the leaf.

[0011] (5) The support structure described in any one of the above paragraphs (1) to (4) may include a plurality of fixing parts, the plurality of fixing parts including a leaf-side fixing part that fixes the part of the support that is located on the underside of the leaf to the underside of the leaf, and a branch-trunk-side fixing part that fixes the part of the support that is located on the side of the branch or trunk to the branch or trunk.

[0012] (6) The support structure described in any one of the above paragraphs (1) to (5) may further include a barrier that is fixed to the support and surrounds the acquisition portion, thereby enabling the creation of a space sandwiched between the support and the back surface of the leaf.

[0013] (7) The support structure described in (6) above may further include a wall-side fixing portion that fixes at least a portion of the part of the barrier opposite to the support to the back surface of the leaf.

[0014] (8) In the support structure described in (7) above, the area of ​​the wall-side fixing portion may be smaller than the total area of ​​the portion of the barrier opposite to the support.

[0015] (9) The support structure described in (7) or (8) above may further include an intervening portion that fills the gap between the portion of the barrier opposite to the support and the back surface of the leaf.

[0016] (10) In the support structure described in (9) above, the intervening portion may have light-shielding properties.

[0017] (11) In the support structure according to any one of (1) to (10) above, the support may extend along the main vein on the back side of the leaf and then extend toward the branch or trunk of the plant.

[0018] (12) In the support structure according to any one of (1) to (11) above, the area of the portion of the support disposed on the back side of the leaf that is fixed to the back side of the leaf may be smaller than the area of the entire back side of the leaf. (13) The system according to an aspect of the present invention includes the support structure according to any one of (1) to (12) above, a light source supported by a portion of the support disposed on the back side of the leaf, a leaf-side housing that houses the portion of the support disposed on the back side of the leaf together with the acquisition unit and the light source, a control device that controls the acquisition unit and the light source, and a branch-trunk-side housing that houses the portion of the support disposed on the side of the branch or trunk together with the control device and is fixed to the branch or trunk. (14) The system according to (13) above may further include a power source that is housed in the branch-trunk-side housing and supplies power to the acquisition unit, the light source, and the control device.

Advantages of the Invention

[0019] According to the present invention, in the long-term observation of plant leaves, it is possible to provide a support structure and a system that can suppress damage to the leaves and inhibition of photosynthesis, and can maintain the robustness of the mounting ability.

Brief Description of the Drawings

[0020] [Figure 1] A perspective view showing an example of attaching the support structure of the embodiment to a plant. [Figure 2] A perspective view showing a configuration example of the support structure of the embodiment. [Figure 3] A view showing an example of fixing the support structure of the embodiment to the back side of the leaf. [Figure 4] A perspective view showing an example of a system including a part of the support structure of the embodiment. [Figure 5]Exploded perspective view of the leaf-side housing in the system of the embodiment. [Figure 6] Exploded perspective view of the branch-and-trunk-side housing in the system of the embodiment. [Figure 7] Diagram showing an example of the arrangement of the acquisition unit and the light source in the system of the embodiment. [Figure 8] Explanatory diagram of step 1 for acquiring the reflection spectrum of a leaf using the acquisition unit and the light source in the system of the embodiment. [Figure 9] Explanatory diagram of step 2 for acquiring the reflection spectrum of a leaf using the acquisition unit and the light source in the system of the embodiment. [Figure 10] Perspective view showing an example of attaching the system of the embodiment to a plant. [Figure 11] Perspective view showing an example of attaching the system of the example to a plant. [Figure 12] Graph showing measurement data by the system of the example, where the upper part of FIG. 12 shows reflection spectroscopic data and the lower part of FIG. 12 shows ambient light respectively.

Mode for Carrying Out the Invention

[0021] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, as a support structure, a structure for non-destructively measuring real-time physiological changes of plants will be described as an example. In the drawings used in the following description, the scales of each member are appropriately changed in order to make each member recognizable in size.

[0022] <Support structure> FIG. 1 is a perspective view showing an example of attaching the support structure 1 of the embodiment to a plant 10. For example, the plant 10 is a terrestrial plant (land plant) growing on land. Note that the plant 10 is not limited to being a terrestrial plant. For example, the plant 10 may be an aquatic plant growing in water or on the water surface. For example, the support structure 1 can be applied to any plant.

[0023] The plant 10 comprises branches 11 (e.g., stems) that branch off from the trunk, and a plurality of leaves 12 provided on the branches 11. In the example shown in the figure, three leaves 12 are provided at the tip of the branch 11. In the example shown in the figure, the support structure 1 is provided along one of the three leaves 12 (e.g., the largest leaf) and one branch 11.

[0024] Support structure 1 is a structure for positioning acquisition units 2A, 2B, and 2C, which acquire information about the state of the leaves 12 of a plant 10 or the surrounding environment, near the leaves 12. Support structure 1 comprises a support body 3 that supports the acquisition units 2A, 2B, and 2C, fixing units 4A, 4B, and 4C that fix the support body 3 to the plant 10, and a barrier 5 that surrounds the acquisition units 2A, 2B, and 2C, thereby enabling the creation of a space sandwiched between the support body 3 and the underside 14 of the leaves. The support body 3 is fixed by the fixing units 4A, 4B, and 4C in a state that extends from the underside 14 of the leaves to the branches 11 of the plant 10, so that the acquisition units 2A, 2B, and 2C are positioned on the underside 14 of the leaves (corresponding to the abaxial side of the leaves) rather than the surface 13 of the leaves (corresponding to the adaxial side of the leaves). In Figure 1, the surface 13 of the leaves is shown with dot hatching.

[0025] For example, the acquisition units 2A, 2B, and 2C are optical sensors capable of optical measurements such as spectroscopic measurements. For example, the optical sensors may be commercially available products such as S11059-02DT (manufactured by Hamamatsu Photonics). Note that the acquisition units 2A, 2B, and 2C are not limited to optical sensors. For example, in addition to optical measurements, the acquisition units 2A, 2B, and 2C may be capable of measuring temperature, humidity, etc. For example, the acquisition units 2A, 2B, and 2C may be temperature sensors, humidity sensors, gas sensors, ion sensors, illuminance sensors, vibration sensors, etc. For example, the acquisition units 2A, 2B, and 2C may be capable of measuring the physical and chemical evaluation of leaves. For example, the acquisition units 2A, 2B, and 2C may be capable of measuring meteorological data in the vicinity of leaves. For example, the acquisition units 2A, 2B, and 2C may be installed at any location in the vicinity of leaves. For example, instead of sensors, environmental detection by color reaction, such as pH test paper, may be implemented, or a combination of these may be used. For example, the configurations of the acquisition units 2A, 2B, and 2C can be changed according to the required specifications.

[0026] For example, there may be multiple sensors within a single barrier. For example, a single acquisition unit may be capable of acquiring multiple pieces of information. In this case, a unit comprising multiple sensors may be placed inside a single barrier to function as an acquisition unit capable of acquiring multiple pieces of information. For example, the configuration of the acquisition unit within the barrier can be changed according to the requirements.

[0027] The acquisition parts 2A, 2B, and 2C are fixed to the support 3. Multiple acquisition parts 2A, 2B, and 2C are provided. In the example shown in the figure, three acquisition parts 2A, 2B, and 2C are provided. The three acquisition parts 2A, 2B, and 2C are spaced apart from each other in the direction in which the support 3 extends. Two acquisition parts 2A and 2B are fixed to the support 3 at different positions where they overlap with the leaf 12. Here, the location where they overlap with the leaf 12 means a location inside the outer edge of the leaf 12 when viewed from the thickness direction of the leaf 12.

[0028] The support 3 extends from a location overlapping with the leaf 12 to a location not overlapping with the leaf 12. Here, the location not overlapping with the leaf 12 means the area outside the outer edge of the leaf 12 when viewed from the thickness direction of the leaf 12. The three acquisition parts 2A, 2B, and 2C include leaf-side acquisition parts 2A and 2B fixed to the support 3 in the location overlapping with the leaf 12, and an outer acquisition part 2C fixed to the support 3 in the location not overlapping with the leaf 12. In the example shown in the figure, there are two leaf-side acquisition parts 2A and 2B and one outer acquisition part 2C.

[0029] Support 3 extends along the main vein 15 on the underside 14 of the leaf, and then extends toward the branch 11 of the plant 10. Here, the main vein 15 refers to the thick vein that extends from the tip of the leaf toward the base of the leaf, running through the central part of the leaf. In the example shown in the figure, support 3 extends from the outer tip of the leaf 12 along the main vein 15 on the underside 14 of the leaf to just before the base of the leaf 12, then curves toward the branch 11 of the plant 10, and then extends along the branch 11.

[0030] The support 3 of the embodiment is elastic. For example, the support 3 has a strip-like shape with a polyimide film or liquid crystal polymer as the base film. For example, the support 3 is a flexible printed circuit board (hereinafter also simply referred to as "flexible board") in which an electrical circuit is formed on a substrate made by laminating a thin base film having insulating and flexible properties with a conductive metal. For example, the width of the support 3 (length in the direction perpendicular to the longitudinal direction and the thickness direction) may be 5 mm or more and 10 mm or less (for example, 7 mm). For example, the sensors which are the acquisition parts 2A, 2B, and 2C may be able to conduct electricity through the flexible board which is the support 3.

[0031] The support 3 is not limited to a flexible substrate. For example, the support 3 may be an elastic member such as a wire or coil. For example, it is desirable that the support 3 be small and lightweight so as not to impose a load on the plant 10, but its shape and material are not limited. For example, it is desirable that the support 3 be able to support itself and the barrier 5 by its elasticity, but its shape and material are not limited. For example, the form of the support 3 can be changed according to the required specifications.

[0032] Multiple fixing parts 4A, 4B, and 4C are provided. The multiple fixing parts 4A, 4B, and 4C include leaf-side fixing parts 4A and 4B that fix the portion of the support 3 that is located on the underside 14 side of the leaf to the underside 14 of the leaf, and branch-side fixing part 4C (an example of a branch-trunk-side fixing part) that fixes the portion of the support 3 that is located on the side of the branch 11 to the branch 11. Leaf-side fixing parts 4A and 4B are examples of wall-side fixing parts that fix at least a portion of the portion of the barrier 5 opposite to the support 3 to the underside 14 of the leaf.

[0033] For example, the leaf-side fixing parts 4A and 4B are adhesives such as silicone adhesives or acrylic adhesives. However, the method of fixing by the leaf-side fixing parts 4A and 4B is not limited to the above. For example, the material used to fix the part of the barrier 5 opposite to the support 3 to the back surface 14 of the leaf may be changed to match the surface shape of the barrier 5. For example, it is desirable that at least one of the barriers 5 is pressed against the back surface 14 of the leaf due to the elasticity of the support 3. For example, the configuration of the leaf-side fixing parts 4A and 4B can be changed according to the required specifications.

[0034] For example, the branch-side fixing part 4C is a string-like member. For example, the part of the support body 3 that is positioned on the side of the branch 11 is fixed by being tied to a part of the branch 11 with the string-like member which is the branch-side fixing part 4C. However, the method of fixing by the branch-side fixing part 4C is not limited to the above. For example, fixing by the branch-side fixing part 4C may be done by adhesive or suction. For example, the branch-side fixing part 4C may be fixed by clamping a part of the branch 11 and the support body 3, like a clip or clamp. For example, the size of the branch-side fixing part 4C is not limited. For example, there may be multiple branch-side fixing parts 4C. For example, the branch-side fixing part 4C does not need to be fixed with the support body 3 itself in contact with the branch 11, but may be fixed via a connector or connector board connected to the support body 3. For example, the form of the branch-side fixing part 4C can be changed according to the required specifications.

[0035] The barrier 5 is fixed to the support 3. Three barriers 5 are provided, corresponding to the three acquisition parts 2A, 2B, and 2C. The three barriers 5 are spaced apart from each other in the direction in which the support 3 extends. The barriers 5 are provided so as to surround the acquisition parts 2A, 2B, and 2C.

[0036] Figure 2 is a perspective view showing an example of the configuration of the support structure 1 of the embodiment. Figure 3 is a diagram showing an example in which the support structure 1 of the embodiment is fixed to the underside 14 of a leaf. In the example shown in the figure, the area around the barrier 5 surrounding the leaf-side acquisition part 2A is shown. The barrier 5 is formed in the shape of a rectangular frame. For example, the barrier 5 may have light-shielding properties. For example, the barrier 5 may be made of a black plastic material. The barrier 5 is provided to reduce disturbances when performing measurements, etc., but its material is not limited. For example, the form of the barrier 5 is selected depending on the acquisition parts 2A, 2B, 2C and the type of measurement. For example, the barrier 5 may be formed with an opaque material to block ambient light. For example, the barrier 5 may be formed with an impermeable material to block the inflow of gas. For example, the form of the barrier 5 can be changed according to the required specifications. For example, an opening may be provided in a part of the barrier 5. For example, gas exchange may be performed through the opening of the barrier 5.

[0037] For example, the support 3 may be provided with a light source for optical measurement, along with the small spectroscopic sensors which are the acquisition units 2A, 2B, and 2C. For example, the light source may be an LED. For example, the support 3 may be provided with a gas source for gas measurement. For example, the barrier 5 may be provided so as to surround the small spectroscopic sensors and light source, etc. In the example of Figure 1, the height of the barrier 5 is greater than the thickness of the elements of the acquisition unit (e.g., the sensor). For example, the barrier 5 may function as a spacer when it is necessary to maintain an appropriate distance for measurement between the top surface of the sensor and the underside 14 of the leaf. For example, the size (especially the height) of the barrier 5 can be changed according to the required specifications.

[0038] Hereinafter, the structure including the small spectroscopic sensors (acquisition units 2A, 2B, 2C), light sources, etc., and barrier 5 will also be referred to as "chambers 20A, 20B, 20C". In the example in Figure 1, three chambers 20A, 20B, 20C (an example of multiple chambers) are provided. The barrier 5 is formed in the shape of a rectangular frame, but its shape is not limited. For example, the barrier 5 may be provided to surround the sensors in accordance with their shape and arrangement. For example, chambers 20A, 20B, 20C may also include light sources for optical measurement, gas sources for gas measurement, air exchange mechanisms, air stirring mechanisms, chemical substance generation mechanisms, etc., in addition to sensors. For example, chambers 20A, 20B, 20C may include elements and mechanisms necessary for constructing the measurement system. For example, the configuration of chambers 20A, 20B, 20C can be changed according to the required specifications.

[0039] For example, if the acquisition units 2A, 2B, 2C, such as sensors, are of a type that does not require a barrier 5, the chambers 20A, 20B, 20C may consist only of sensors. In this case, the sensors may be directly fixed to the underside 14 of the leaf. Alternatively, the support 3 surrounding the sensors may be deformed to directly fix the support 3 to the underside 14 of the leaf. For example, depending on the measurement requirements, one or more chambers 20A, 20B, 20C may be installed without being glued to the underside 14 of the leaf. In this case, a part of the support 3 may be fixed to the underside 14 of the leaf. For example, the manner in which the components of the support structure 1 are fixed to the underside 14 of the leaf can be changed according to the required specifications.

[0040] In this embodiment, a small spectroscopic sensor and light source are mounted on a 7mm wide flexible substrate as the support 3, and chambers 20A, 20B, and 20C are constructed by placing a black plastic barrier 5 around them. The color and material of the barrier 5 are not limited to those described above and can be changed according to the required specifications. For example, communication with the sensor and control of the light source are performed by a microcontroller or any personal computer (an example of a control device). For example, by utilizing the communication function of the control device, it is also possible to acquire measurement data remotely.

[0041] In this embodiment, the area of ​​the leaf-side fixing parts 4A and 4B (an example of a wall-side fixing part) is smaller than the total area of ​​the part of the barrier 5 opposite to the support 3. Here, the total area of ​​the part of the barrier 5 opposite to the support 3 refers to the total area of ​​the part of the barrier 5 on the underside 14 of the leaves. The total area of ​​the part of the barrier 5 opposite to the support 3 corresponds to the area of ​​the underside 14 of the leaves along the four sides of the rectangular frame-shaped barrier 5. In the example in Figure 2, the leaf-side fixing part 4A is positioned on a surface along only one side 51 of the four sides 51, 52, 53, and 54 of the rectangular frame-shaped barrier 5. In this case, the area of ​​the leaf-side fixing part 4A is approximately one-quarter of the total area of ​​the part of the barrier 5 opposite to the support 3.

[0042] The support structure 1 of this embodiment further includes an intervening portion 6 that fills the gap between the portion of the barrier 5 opposite to the support 3 and the underside 14 of the leaf. In the example shown in Figure 2, the intervening portion 6 is positioned on the surface along three of the four sides 51, 52, 53, 54 of the rectangular frame-shaped barrier 5, namely sides 52, 53, and 54. The intervening portion 6 is formed along the sides 52, 53, and 54 of the rectangular frame-shaped barrier 5 where the leaf-side fixing portion 4A is not located. The intervening portion 6 is formed in a U-shape along sides 52, 53, and 54.

[0043] In this embodiment, the intervening portion 6 has light-shielding properties. For example, the intervening portion 6 is made of a black material such as rubber or sponge. The intervening portion 6 is provided to reduce the pressing force when the barrier 5 is pressed against the underside 14 of the leaf, but its material is not limited. For example, the form of the intervening portion 6 is selected depending on the magnitude of the pressing force. For example, the intervening portion 6 may be made of an opaque material to block ambient light. For example, the intervening portion 6 may be made of an impermeable material to block the inflow of gas. For example, the form of the intervening portion 6 can be changed according to the required specifications.

[0044] In this embodiment, the area of ​​the portion of the support 3 that is positioned on the underside of the leaf 14 and fixed to the underside of the leaf 14 is smaller than the total area of ​​the underside of the leaf 14. In the example shown in the figure, the area of ​​the portion of the support 3 that is positioned on the underside of the leaf 14 and fixed to the underside of the leaf 14 is the area of ​​the leaf-side fixing portions 4A and 4B.

[0045] <Effects and Effects> As described above, the support structure 1 according to this embodiment is a structure for positioning acquisition units 2A, 2B, and 2C, which acquire information about the state of the leaves 12 of a plant 10 or the surrounding environment, near the leaves 12. The support structure 1 comprises a support body 3 that supports the acquisition units 2A, 2B, and 2C, and fixing units 4A, 4B, and 4C that fix the support body 3 to the plant 10. The support body 3 is fixed by the fixing units 4A, 4B, and 4C in a state that extends from the underside 14 side of the leaf to the branch 11 of the plant 10, such that the acquisition units 2A, 2B, and 2C are positioned on the underside 14 side of the leaf rather than the surface 13 side of the leaf.

[0046] With this configuration, the acquisition parts 2A, 2B, and 2C are positioned on the underside 14 of the leaf rather than the upper surface 13, eliminating the need to provide a structure on the upper surface 13. Therefore, damage to the leaf and inhibition of photosynthesis can be suppressed during long-term observation of plant leaves. In addition, since the support 3 that supports the acquisition parts 2A, 2B, and 2C is fixed by the fixing parts 4A, 4B, and 4C while extending from the underside 14 of the leaf to the branch 11 of the plant 10, the robustness of the attachment capability can be maintained. Thus, a support structure 1 can be provided that suppresses damage to the leaf and inhibition of photosynthesis during long-term observation of plant leaves, while also maintaining the robustness of the attachment capability.

[0047] The support 3 according to this embodiment is elastic. With this configuration, the elasticity of the support 3 allows the acquisition parts 2A, 2B, and 2C to be pressed against the underside 14 of the leaf.

[0048] Multiple acquisition units 2A and 2B are provided according to this embodiment. The multiple acquisition units 2A and 2B are fixed to the support 3 at different positions in a location that overlaps with the leaf 12. With this configuration, information regarding the state of different locations on the underside of the leaf 14 or the surrounding environment can be acquired by multiple acquisition units 2A and 2B.

[0049] In this embodiment, the support 3 extends from a location overlapping with the leaf 12 to a location not overlapping with the leaf 12. Multiple acquisition parts 2A, 2B, and 2C are provided. The multiple acquisition parts 2A, 2B, and 2C include leaf-side acquisition parts 2A and 2B fixed to the support 3 at the location overlapping with the leaf 12, and an outer acquisition part 2C fixed to the support 3 at the location not overlapping with the leaf 12. With this configuration, information about areas overlapping with the leaf 12 can be acquired by the leaf-side acquisition units 2A and 2B, while information about areas not overlapping with the leaf 12 can be acquired by the outer acquisition unit 2C. For example, if the leaf-side acquisition units 2A and 2B are light sensors, they can measure light transmitted from the upper surface 13 side to the lower surface 14 side of the leaf (transmitted light). For example, if the outer acquisition unit 2C is a light sensor, it can measure light that is not transmitted light (e.g., ambient light). For example, data on the amount of light absorbed by the leaf 12 can be acquired based on the transmitted light and ambient light.

[0050] Multiple fixing parts 4A, 4B, and 4C are provided according to this embodiment. The multiple fixing parts 4A, 4B, and 4C include leaf-side fixing parts 4A and 4B that fix the portion of the support 3 that is located on the underside 14 side of the leaf to the underside 14 of the leaf, and branch-side fixing part 4C that fixes the portion of the support 3 that is located on the branch 11 side to the branch 11. With this configuration, the weight of the support 3 is distributed between the leaf-side fixing parts 4A and 4B and the branch-side fixing part 4C, thus preventing damage to the plant 10.

[0051] The support structure 1 according to this embodiment further includes a barrier 5 that is fixed to the support body 3 and surrounds the acquisition parts 2A, 2B, and 2C, thereby enabling the creation of a space sandwiched between the support body 3 and the back surface 14 of the leaf. With this configuration, the acquisition parts 2A, 2B, and 2C are surrounded by the barrier 5, thus protecting them from external factors. In this embodiment, since the barrier 5 is supported by the elasticity of the support 3, excessive load on the contact surface between the underside of the leaf 14 and the barrier 5 can be suppressed. In addition, even if the contact area between the underside of the leaf 14 and the barrier 5 is small, the acquisition parts 2A, 2B, and 2C can be installed stably over a long period of time. Furthermore, because the contact area between the underside of the leaf 14 and the barrier 5 is small, it does not hinder the growth or deformation of the leaf 12. Also, because the barrier 5 is pressed against the underside of the leaf 14, disturbances can be reduced by the barrier 5.

[0052] The support structure 1 according to this embodiment further includes wall-side fixing parts 4A and 4B (leaf-side fixing parts) that fix at least a portion of the part of the barrier 5 opposite to the support 3 to the underside 14 of the leaf. With this configuration, the wall-side fixing parts 4A and 4B allow the portion of the barrier 5 opposite to the support 3 to be fixed to the underside 14 of the leaf. For example, compared to cases where the acquisition parts 2A and 2B themselves are fixed to the underside 14 of the leaf, or where the support 3 itself is fixed to the underside 14 of the leaf, it is easier to maintain the robustness of the attachment capability. In this embodiment, multiple barriers 5 are fixed to the underside 14 of the leaf by corresponding wall-side fixing parts 4A and 4B. As a result, compared to the case where only one barrier 5 is fixed to the underside 14 of the leaf, the load on the leaf 12 can be distributed, making it easier to avoid damaging the leaf 12.

[0053] The area of ​​the wall-side fixing parts 4A and 4B according to this embodiment is smaller than the total area of ​​the part of the barrier 5 opposite to the support 3. This configuration makes it less likely to hinder the growth and deformation of the leaf 12 compared to the case where the entire portion of the barrier 5 opposite to the support 3 is fixed to the underside 14 of the leaf.

[0054] The support structure 1 according to this embodiment further includes an intervening portion 6 that is interposed in the barrier 5 to fill the gap between the portion opposite to the support 3 and the underside 14 of the leaf. With this configuration, the gap between the part of the barrier 5 opposite to the support 3 and the underside of the leaf 14 is filled by the intervening part 6, thereby protecting the acquisition parts 2A and 2B from external factors.

[0055] The intervening portion 6 according to this embodiment has light-shielding properties. With this configuration, the intervening part 6 can block light (e.g., ambient light) that travels from the gap between the part of the barrier 5 opposite to the support 3 and the underside 14 of the leaf towards the acquisition parts 2A and 2B. For example, if the acquisition parts 2A and 2B are light sensors, the light transmitted from the top surface 13 to the underside 14 of the leaf (transmitted light) can be measured accurately without being affected by ambient light or other factors.

[0056] In this embodiment, the support 3 extends along the main vein 15 on the underside 14 of the leaf, and then extends toward the branch 11 of the plant 10. This configuration allows for maintaining the robustness of the attachment capability compared to the case where the support 3 extends intersecting the main vein 15 on the underside 14 of the leaf.

[0057] In the support 3 according to this embodiment, the area of ​​the portion that is positioned on the underside 14 of the leaf and fixed to the underside 14 of the leaf is smaller than the area of ​​the entire underside 14 of the leaf. With this configuration, the entire portion of the support 3 that is positioned on the underside 14 side of the leaf is fixed to the underside 14 of the leaf, compared to the case where the entire portion is fixed to the underside 14 of the leaf, it is less likely to hinder the growth and deformation of the leaf 12.

[0058] It should be noted that the technical scope of the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention.

[0059] In the embodiments described above, the support was described as being fixed to the branch of the plant with the acquisition part positioned on the underside of the leaf rather than the upper side of the leaf, extending from the underside of the leaf to the branch. However, the invention is not limited to this. For example, the support may be fixed to the trunk of the plant with the acquisition part positioned on the underside of the leaf rather than the upper side of the leaf, extending from the underside of the leaf to the trunk. For example, the manner in which the support extends from the underside of the leaf to the branch or trunk can be changed according to the requirements.

[0060] In the embodiments described above, an example in which the support is elastic was given, but the invention is not limited to this. For example, the support does not have to be elastic. For example, the support may be a member that can be considered a rigid body. For example, the form of the support can be changed according to the required specifications.

[0061] In the embodiments described above, an example was given in which multiple acquisition units are fixed to the support at different positions where they overlap with the leaves, but the invention is not limited to this. For example, only one acquisition unit may be fixed to the underside of the leaf. For example, the fixing method and installation method of the acquisition units can be changed according to the required specifications.

[0062] In the embodiments described above, the multiple acquisition units were explained using an example that included leaf-side acquisition units fixed to the support in a location overlapping with the leaves, and outer acquisition units fixed to the support in a location not overlapping with the leaves, but the invention is not limited to this. For example, acquisition units do not have to be provided in locations not overlapping with the leaves. For example, acquisition units may be provided only in locations overlapping with the leaves. For example, acquisition units may be provided only in locations not overlapping with the leaves. For example, the installation configuration of the acquisition units can be changed according to the required specifications.

[0063] In the embodiments described above, the multiple fixing parts were explained with an example that included a leaf-side fixing part that fixes the portion of the support located on the underside of the leaf to the underside of the leaf, and a branch-side fixing part that fixes the portion of the support located on the branch side to the branch, but the invention is not limited to this. For example, the portion of the support located on the underside of the leaf does not have to be fixed to the underside of the leaf. For example, only the portion of the support located on the branch or trunk side may be fixed to the branch or trunk. For example, the fixing method of the support can be changed according to the requirements.

[0064] In the embodiments described above, the support structure was described as having a barrier fixed to the support and surrounding the acquisition part, thereby creating a space sandwiched between the support and the underside of the leaf. However, it is not limited to this. For example, the support structure does not have to have a barrier. For example, the acquisition part may be surrounded by the support. For example, the acquisition part may be exposed to the external space. For example, the manner in which the acquisition part is protected can be changed according to the requirements.

[0065] In the embodiments described above, the support structure was explained with an example in which at least a portion of the part of the barrier opposite to the support is fixed to the underside of the leaf, but it is not limited to this. For example, the support structure does not have to have a wall-side fixing part. For example, the acquisition part itself may be fixed to the underside of the leaf. For example, the support itself may be fixed to the underside of the leaf. For example, the manner in which the barrier is fixed can be changed according to the requirements.

[0066] In the embodiments described above, the area of ​​the wall-side fixing portion was explained as being smaller than the total area of ​​the portion of the barrier opposite to the support, but this is not limited to this example. For example, the entire portion of the barrier opposite to the support may be fixed to the underside of the leaf. For example, the area of ​​the wall-side fixing portion may be the same as the total area of ​​the portion of the barrier opposite to the support. For example, the area of ​​the wall-side fixing portion can be changed according to the required specifications.

[0067] In the embodiments described above, the support structure was explained with an example in which an intervening portion is provided to fill the gap between the part of the barrier opposite to the support and the underside of the leaf, but it is not limited to this. For example, the support structure does not have to have an intervening portion. For example, there may be a gap between the part of the barrier opposite to the support and the underside of the leaf. For example, the manner in which the intervening portion is installed can be changed according to the required specifications.

[0068] In the embodiments described above, an example was given in which the intervening portion has light-shielding properties, but the invention is not limited to this. For example, the intervening portion does not have to have light-shielding properties. For example, the intervening portion may be a light-transmitting material. For example, the form of the intervening portion can be changed according to the required specifications.

[0069] In the embodiments described above, an example was given in which the support extends along the main vein on the underside of the leaf and then extends toward the branch of the plant, but the invention is not limited to this. For example, the support may extend across the main vein on the underside of the leaf. For example, the manner in which the support extends can be changed according to the requirements.

[0070] In the embodiments described above, an example was given in which the area of ​​the portion of the support positioned on the underside of the leaf that is fixed to the underside of the leaf is smaller than the area of ​​the entire underside of the leaf. However, this is not limited to this example. For example, the entire portion of the support positioned on the underside of the leaf may be fixed to the underside of the leaf. For example, the area of ​​the portion of the support positioned on the underside of the leaf that is fixed to the underside of the leaf may be the same as the area of ​​the entire underside of the leaf. For example, the area of ​​the portion of the support positioned on the underside of the leaf that is fixed to the underside of the leaf can be changed according to the requirements.

[0071] <System> Figure 4 is a perspective view showing an example of system 100 equipped with part of the support structure of the embodiment. Figure 5 is an exploded perspective view of the leaf-side housing 110 in system 100 of the embodiment. Figure 6 is an exploded perspective view of the branch-trunk-side housing 120 in system 100 of the embodiment. In the following description, components similar to those in the above-described embodiment are denoted by the same reference numerals, and their detailed descriptions are omitted. Referring to Figures 4 to 6, a part of the support structure 1 described above (such as the support body 3 in the example shown in the figures) may be applied to an outdoor measuring system 100 powered by a battery, which is a power source 131.

[0072] System 100 comprises a part of the support structure 1 (an example of at least a part of the support structure), a light source 107 supported on the part of the support 3 located on the back surface 14 side of the leaf 12, a leaf-side housing 110 that houses the part of the support 3 located on the back surface 14 side of the leaf 12 together with the acquisition unit 102 and the light source 107, a control device 130 that controls the acquisition unit 102 and the light source 107, a power supply 131 that supplies power to the acquisition unit 102, the light source 107 and the control device 130, and a branch / trunk-side housing 120 that houses the part of the support 3 located on the branch 11 or trunk side together with the control device 130 and the power supply 131 and is fixed to the branch 11 or trunk. Note that System 100 is not limited to comprising only the part of the support structure 1 described above, but may also comprise the entirety of the support structure 1 described above. For example, the configuration of System 100 can be changed according to the design specifications.

[0073] In the example shown in the figure, there is one small spectroscopic sensor (hereinafter also simply referred to as "sensor") which is the acquisition unit 102, and two LEDs which are the light sources 107. In the example shown in the figure, the two LEDs are arranged in a row with one sensor in between. Note that the number of acquisition units 102 and light sources 107 installed, as well as their arrangement, are not limited to the above and can be changed according to the design specifications.

[0074] The acquisition unit 102 and the light source 107 are supported on the support 3 via a connector substrate 108 in the portion located on the back surface 14 side of the leaf 12. Alternatively, the acquisition unit 102 and the light source 107 may be directly supported on the support 3 in the portion located on the back surface 14 side of the leaf 12, without the connector substrate 108. For example, the support configuration of the acquisition unit 102 and the light source 107 can be changed according to the design specifications.

[0075] The leaf-side housing 110 houses the portion of the support 3 that is located on the back surface 14 side of the leaf 12, together with the acquisition unit 102, the light source 107, and the connector substrate 108. The leaf-side housing 110 consists of an upper cover 111 that is positioned to cover the portion of the support 3 that is located on the back surface 14 side of the leaf 12, together with the acquisition unit 102, the light source 107, and the connector substrate 108 from above, and a lower cover 112 that is positioned to cover the connector substrate 108 from below. For example, the leaf-side housing 110 may function to fix the sensor while maintaining an appropriate distance between the sensor's upper surface and the leaf's underside 14, as shown by the barrier 5 in Figure 2. For example, the leaf-side housing 110 may have light-shielding properties by being painted black or made of black material. For example, the leaf-side housing 110 may have at least one of the functions of the support 3 and the barrier 5. For example, the function and configuration of the leaf-side housing 110 can be changed according to the design specifications.

[0076] The upper cover 111 has a rectangular slit 113 formed therein that exposes the acquisition unit 102 and the light source 107 when viewed from above. The shape of the slit 113 is not limited to the above; it may also be oval when viewed from above. For example, the form of the slit 113 can be changed according to the design specifications.

[0077] The outer shape of the upper cover 111 is rectangular, and is larger than the outer shape of the rectangular connector substrate 108 when viewed from above. However, the outer shape of the upper cover 111 is not limited to the above; it may also be circular when viewed from above. For example, the shape of the upper cover 111 can be changed according to the design specifications.

[0078] The outer shape of the lower cover 112 is rectangular, and is larger than the outer shape of the rectangular connector substrate 108 when viewed from above. For example, the outer shape of the lower cover 112 is the same size as the outer shape of the upper cover 111 when viewed from above. However, the outer shape of the lower cover 112 is not limited to the above; it may also be circular when viewed from above. For example, the shape of the lower cover 112 can be changed according to the design specifications.

[0079] For example, the leaf-side housing 110 can be formed by housing the portion of the support 3 that is positioned on the back surface 14 side of the leaf 12 together with the acquisition unit 102, light source 107, and connector substrate 108 in the internal space of the lower cover 112, and then fitting the upper cover 111 onto the lower cover 112 (an example of joining). For example, the joint between the upper cover 111 and the lower cover 112 may be sealed with a sealing material such as silicone sealant (not shown). This makes it possible to maintain waterproofness that can withstand long-term outdoor measurements.

[0080] For example, the control device 130 is a microcontroller. The control device 130 controls one sensor, which is the acquisition unit 102, and two LEDs, which are the light sources 107. By controlling the sensor and LEDs, the control device 130 acquires data on the amount of light absorbed by the leaf 12, etc. The control device 130 not only controls the sensor, etc., but also has a data calculation function. The control device 130 has wireless communication capabilities in addition to wired communication. Examples of the control device 130 include a small, low-power microcontroller with functions such as WiFi® and Bluetooth®. For example, the control device 130 may wirelessly transfer the acquired data to an external device (e.g., a personal computer, smartphone, online storage, etc.). For example, the manner in which the data is aggregated can be changed according to the design specifications.

[0081] The control device 130 is supported on the support body 3 via an expansion board 132 in a portion located on the side of the branch 11 or trunk. The expansion board 132 is an electronic circuit board on which electronic components for adding and enhancing the functions of the control device 130 are mounted, and a portion of it has connection terminals. The control device 130 may also be directly supported on the support body 3 in a portion located on the side of the branch 11 or trunk, without the expansion board 132. For example, the support configuration of the control device 130 can be changed according to the design specifications.

[0082] For example, power supply 131 is a lithium battery. Power supply 131 supplies power to one sensor, which is the acquisition unit 102, two LEDs, which are the light sources 107, and the control device 130. In the example shown in the figure, two power supplies 131 are held by a holder 133. Note that power supply 131 may be a battery other than a lithium battery. For example, one or more power supplies 131 may be provided. For example, power supplies 131 do not have to be held by a holder 133. For example, the type, number, and holding method of power supplies 131 can be changed according to the design specifications.

[0083] The branch / trunk side housing 120 houses the portion of the support 3 that is located on the branch 11 or trunk side, along with the control device 130, expansion board 132, power supply 131, holder 133, and voltage regulator 134. The voltage regulator 134 is an electronic component equipped with an integrated circuit that keeps the output voltage of the power supply 131 constant according to the input voltage, output current, and load resistance. For example, the manner in which each component is housed within the enclosure (such as the structure of the housing) can be changed according to the design specifications. For instance, when housing a support, a spring-type enclosure using a spring (not shown) can be adopted.

[0084] The branch / trunk side housing 120 consists of an upper case 121 that covers the portion of the support 3 located on the branch 11 or trunk side together with the control device 130, expansion board 132, power supply 131, holder 133, and voltage regulator 134 from above, and a lower case 122 that covers the portion of the support 3 located on the branch 11 or trunk side together with the control device 130, expansion board 132, power supply 131, holder 133, and voltage regulator 134 from below.

[0085] The upper case 121 consists of an upper base 123 having a rectangular shape when viewed from above, and upper protrusions 124 having through holes and projecting outward from the four corners of the upper base 123. The outer shape of the upper base 123 is a rectangle that is larger than the area including the part of the support 3 that is located on the side of the branch 11 or trunk, the control device 130, the expansion board 132, the power supply 131, the holder 133, and the voltage regulator 134 when viewed from above. Note that the shape of the upper base 123 is not limited to the above and can be changed according to the design specifications.

[0086] The lower case 122 consists of a bottomed cylindrical lower base 125 having a rectangular shape when viewed from above, lower protrusions 126 having through holes and protruding outward from the four upper corners of the lower base 125, a U-shaped first engaging portion 127 located on the lower base 125 opposite to the portion through which the support 3 passes, and a U-shaped second engaging portion 128 located on the lower part of the lower base 125.

[0087] The outer shape of the lower base 125 is rectangular, larger than the area including the portion of the support 3 located on the side of the branch 11 or trunk, the control device 130, the expansion board 132, the power supply 131, the holder 133, and the voltage regulator 134 when viewed from above. For example, the outer shape of the lower base 125 is the same size as the outer shape of the upper base 123 when viewed from above. Note that the shape of the lower base 125 is not limited to the above and can be changed according to the design specifications.

[0088] For example, the control device 130, expansion board 132, power supply 131, holder 133, and voltage regulator 134 are housed in the internal space of the lower case 122 along with the parts of the support 3 that are arranged on the branch 11 or trunk side. Then, the upper case 121 is fitted (an example of joining) to the lower case 122 to form the branch / trunk side housing 120. For example, the joint between the upper case 121 and the lower case 122 may be sealed with a sealing material such as silicone sealant (not shown). In this case, the upper protrusion 124 and the lower protrusion 126 protrude, making the fitting part flat and facilitating the uniform application of the sealing material. This makes it possible to maintain waterproofness that can withstand long-term outdoor measurements.

[0089] For example, when sealing the joint between the upper case 121 and the lower case 122 with a sealant, the upper protrusion 124 and the lower protrusion 126 may be temporarily fixed (an example of fixing) with screws or the like through their respective through holes. This allows the upper case 121 and the lower case 122 to be stably fixed together. Note that the manner in which the upper case 121 and the lower case 122 are fixed together is not limited to the above and can be changed according to the design specifications.

[0090] <How to obtain the reflectance spectrum of a leaf> Figure 7 shows an example of the arrangement of the acquisition unit 102 and light source 107 in the system 100 of the embodiment. Figure 8 is an explanatory diagram of step 1, in which the reflection spectrum of the leaf 12 is acquired using the acquisition unit 102 and light source 107 in the system 100 of the embodiment. Figure 9 is an explanatory diagram of step 2, in which the reflection spectrum of the leaf 12 is acquired using the acquisition unit 102 and light source 107 in the system 100 of the embodiment. Referring to Figures 7 to 9, the control device 130 acquires the reflection spectrum of the leaf 12 using the sensor, which is the acquisition unit 102, and the LED, which is the light source 107.

[0091] The control device 130 acquires the reflectance spectrum in steps 1 and 2. Ambient light, such as sunlight, passes through the leaf 12. In step 1, the control device 130 acquires data using a sensor with the LED turned on. In step 1, the control device 130 acquires transmitted light (light that has passed through the leaf 12 from the surface 13 to the back surface 14) and reflected light (light that has been reflected by the LED light from the back surface 14 of the leaf 12). In step 2, the control device 130 acquires data using a sensor with the LED turned off. In step 2, the control device 130 acquires only transmitted light.

[0092] The control device 130 obtains the reflected light intensity from the underside 14 of the leaf 12 based on the difference between the data acquired in step 1 and step 2. The control device 130 obtains the reflection spectrum based on the acquired reflected light intensity and parameters such as wavelength. The control device 130 may transmit the data after performing calculations on it, or it may transmit all the unprocessed data. In addition, the control device 130 can obtain the ambient light and the intensity of light correlated with the ambient light using only the data from step 2.

[0093] <System Fixing Method> Figure 10 is a perspective view showing an example of the system 100 of the embodiment attached to a plant 10. Referring also to Figure 10, the branch-trunk housing 120 constituting the system 100 is fixed to the branch 11 or trunk. In the example shown in the figure, the branch-trunk housing 120 is fixed to the branch 11 by a cable tie 104A (an example of a branch-side fixing part) engaging with the U-shaped first engaging part 127. Note that the fixing method of the branch-trunk housing 120 is not limited to the above and can be changed according to the design specifications.

[0094] For example, the leaf-side housing 110 that constitutes the system 100 is fixed to the back surface 14 of the leaf 12. In the example shown in the figure, the leaf-side housing 110 is fixed by being adhered to the back surface 14 of the leaf 12 with double-sided tape (an example of a leaf-side fixing part) which is attached around the slit 113. Note that the fixing method of the leaf-side housing 110 is not limited to the above and can be changed according to the design specifications.

[0095] For example, a portion of the support 3 that constitutes the system 100 is fixed to a branch 11 or a trunk. In the example shown in the figure, the portion of the support 3 between the leaf-side housing 110 and the branch / trunk-side housing 120 is fixed to the branch 11 by a multi-joint clip 104B (an example of a branch-side fixing part). Note that the fixing method of the support 3 is not limited to the above and can be changed according to the design specifications.

[0096] <Effects and Effects> As described above, the system 100 according to this embodiment comprises a part of the support structure 1, a light source 107 supported in the portion of the support 3 located on the back surface 14 side of the leaf 12, a leaf-side housing 110 that houses the portion of the support 3 located on the back surface 14 side of the leaf 12 together with the acquisition unit 102 and the light source 107, a control device 130 that controls the acquisition unit 102 and the light source 107, a power supply 131 that supplies power to the acquisition unit 102, the light source 107 and the control device 130, and a branch / trunk-side housing 120 that houses the portion of the support 3 located on the branch 11 or trunk side together with the control device 130 and the power supply 131 and is fixed to the branch 11 or trunk.

[0097] With this configuration, the acquisition part 102 constituting the support structure 1 is positioned on the underside 14 side of the leaf 12 rather than the surface 13 side, eliminating the need to provide a structure on the surface 13 side of the leaf 12. Therefore, during long-term observation of the leaves 12 of the plant 10, damage to the leaves 12 and inhibition of photosynthesis can be suppressed. In addition, since the support body 3 that supports the acquisition part 102 is fixed by the fixing part while extending from the underside 14 side of the leaf 12 to the branch 11 of the plant 10, the robustness of the attachment capability can be maintained. Thus, a system 100 can be provided that, in addition to suppressing damage to the leaves 12 and inhibition of photosynthesis during long-term observation of the leaves 12 of the plant 10, maintains the robustness of the attachment capability. Furthermore, by providing a power supply 131 that supplies power to the acquisition unit 102, light source 107, and control device 130, long-term observation of the leaves 12 of the plant 10 can be performed without requiring an external power supply. In addition, by providing a leaf-side housing 110 that houses the acquisition unit 102 and light source 107 together with the portion of the support 3 that is located on the underside 14 of the leaf 12, the acquisition unit 102 and light source 107 can be protected from external factors. In addition, by providing a branch / trunk-side housing 120 that houses the control device 130 and power supply 131 together with the portion of the support 3 that is located on the branch 11 or trunk side, the control device 130 and power supply 131 can be protected from external factors. In addition, by fixing the branch / trunk-side housing 120 to the branch 11 or trunk, the robustness of the mounting capability can be maintained during long-term observation of the leaves 12 of the plant 10.

[0098] In this embodiment, the system 100 has a branch-side housing 120 fixed to the branch 11 with a cable tie 104A, a leaf-side housing 110 fixed to the back surface 14 of the leaf 12 with double-sided tape, and furthermore, a part of the support 3 is fixed to the branch 11 with a multi-joint clip 104B. With this configuration, the weight of the support 3 is distributed between the leaf 12 side and the branch 11 side, thus preventing damage to the plant 10. In addition, since the branch / trunk side housing 120 (a structure including the control device 130 and power supply 131, etc.), which is a heavy component in the system 100, is fixed to the branch 11 with cable ties, the robustness of the mounting capability can be sufficiently maintained.

[0099] The leaf-side housing 110 according to this embodiment comprises an upper cover 111 and a lower cover 112. The joint between the upper cover 111 and the lower cover 112 is sealed with a sealing material. This configuration prevents rainwater and other liquids from entering the internal space of the leaf-side housing 110 through the joint between the upper cover 111 and the lower cover 112. Therefore, it is possible to maintain waterproofness that can withstand long-term outdoor measurements.

[0100] The branch trunk housing 120 according to this embodiment comprises an upper case 121 and a lower case 122. The joint between the upper case 121 and the lower case 122 is sealed with a sealing material. This configuration prevents rainwater and other liquids from entering the internal space of the branch trunk housing 120 from the joint between the upper case 121 and the lower case 122. Therefore, it is possible to maintain waterproofness that can withstand long-term outdoor measurements.

[0101] In the above embodiment, the system was described as being applied to an outdoor measurement system powered by a battery, but it is not limited to this. For example, the system may be applied to an indoor measurement system (e.g., a greenhouse or plant factory) powered by an external power source. For example, the application mode of the system can be changed according to the design specifications. For example, in the above embodiment, the system was described as being housed in a branch / trunk side enclosure and comprising a power supply that provides power to the acquisition unit, light source, and control device, but it is not limited to this. For example, the power supply does not have to be housed in the branch / trunk side enclosure. For example, it may be configured to be able to supply power to the acquisition unit, light source, and control device from an external power supply installed in a greenhouse or plant factory. For example, power may be supplied to the control device etc. inside the enclosure via an electric wire connected to the external power supply. For example, the installation method of the power supply can be changed according to the design specifications. Furthermore, it is possible to replace the components in the above-described embodiments with well-known components without departing from the spirit of the present invention. Also, the above-described modifications may be combined. [Examples]

[0102] The following will provide a detailed description of the system 100 according to the above embodiment of the present invention, with reference to specific examples. Note that the following examples are specific examples to which the present invention is applied and do not limit the present invention.

[0103] <Examples> Figure 11 is a perspective view showing an example of the system of the embodiment attached to a plant. Referring to Figure 11, the system of the embodiment comprises a support body which is part of the support structure, a light source supported on the underside of the leaf of the support body, a leaf-side housing which houses the portion of the support body which is located on the underside of the leaf together with the acquisition unit and the light source, a control device which controls the acquisition unit and the light source, a power supply which supplies power to the acquisition unit, the light source and the control device, and a branch-stem-side housing which houses the portion of the support body which is located on the branch side together with the control device and the power supply and is fixed to the branch. The branch-stem-side housing is fixed to the branch with cable ties, the leaf-side housing is fixed to the underside of the leaf with double-sided tape, and furthermore, a part of the support body is fixed to the branch with a multi-joint clip (corresponding to the configuration of system 100 shown in Figures 4 to 6 and Figure 10). The plant to which the system of the embodiment was attached was a maple tree.

[0104] <Observation Results> The system described in the example was used to observe maple leaves outdoors over a long period. Figure 12 is a graph showing the measurement data from the system described in the example. The upper part of Figure 12 shows the reflectance spectral data, and the lower part shows the ambient light. The upper part of Figure 12 shows the change in reflectance at each wavelength as the reflectance spectral data, and the lower part of Figure 12 shows the sunlight (corresponding to solar irradiance) passing through the leaves as ambient light.

[0105] As shown in Figure 12, the system of the embodiment was able to acquire data on the change in light reflectance in response to the change in the color of maple leaves. It was also confirmed that the light reflectance changes according to each wavelength.

[0106] For example, by observing changes in reflectivity according to the color of plant leaves, or changes in reflectivity according to each wavelength, it is possible to understand how the physiological responses of plants change. Furthermore, it is known that measuring light reflection can be used to monitor diseases, stress, and growth conditions, suggesting its potential for remotely monitoring the health of agricultural crops. [Explanation of Symbols]

[0107] 1…Support structure, 2A, 2B…Leaf-side acquisition part (acquisition part), 2C…Outer side acquisition part (acquisition part), 3…Support body, 4A, 4B…Leaf-side fixing part (wall-side fixing part, fixing part), 4C…Branch-side fixing part (branch-trunk-side fixing part, fixing part), 5…Barrier, 6…Intermediate part, 10…Plant, 11…Branch, 12…Leaf, 13…Leaf surface, 14…Leaf interior, 15…Main vein, 100…System, 102…Acquisition part, 107…Light source, 110…Leaf-side basket, 120…Branch-trunk-side basket, 130…Control device, 131…Power source

Claims

1. A support structure for positioning an acquisition unit, which acquires information about the state of a plant's leaves or the surrounding environment, near the leaves, A support that supports the acquisition part, The support comprises a fixing part for fixing it to the plant, The support is fixed by the fixing portion so that the acquisition portion is positioned on the underside of the leaf rather than the surface of the leaf, extending from the underside of the leaf to the branch or trunk of the plant. The support has elasticity that is at least capable of supporting the support itself. The support extends from a place that overlaps with one of the leaves to a place that does not overlap with the leaf. The support extends from the outer tip of one leaf along the main vein on the underside of the leaf to just before the base of the leaf, then curves toward the branch of the plant, and then extends along the branch. Multiple acquisition units are provided, Multiple acquisition units, The support comprises a plurality of leaf-side acquisition parts fixed in a location overlapping with the leaf, The support includes an outer acquisition portion fixed in a location that does not overlap with the leaf, Multiple leaf-side acquisition units are fixed to the support at different positions on each other, in a location that overlaps with one of the leaves. Support structure.

2. A support structure for positioning an acquisition unit, which acquires information about the state of a plant's leaves or the surrounding environment, near the leaves, A support that supports the acquisition part, The support comprises a fixing part for fixing it to the plant, The support is fixed by the fixing portion so that the acquisition portion is positioned on the underside of the leaf rather than the surface of the leaf, extending from the underside of the leaf to the branch or trunk of the plant. The support extends along the main vein on the underside of the leaf and then extends toward the branch or trunk of the plant. Multiple fixing parts are provided, The multiple fixing parts are, The support comprises a leaf-side fixing portion that fixes the portion positioned on the underside of the leaf to the underside of the leaf, The support includes a branch / trunk side fixing portion that fixes the portion of the support that is positioned on the branch or trunk side to the branch or trunk, Support structure.

3. The support has a strip-like shape with a polyimide film or liquid crystal polymer as the base film. The support structure according to claim 1 or 2.

4. The support is a flexible substrate, The support structure according to claim 1 or 2.

5. Multiple acquisition units are provided, Multiple acquisition units are fixed to the support at different positions in a location that overlaps with one of the leaves. The support structure according to claim 2.

6. A support structure for positioning an acquisition unit, which acquires information about the state of a plant's leaves or the surrounding environment, near the leaves, A support that supports the acquisition part, The support comprises a fixing part for fixing it to the plant, The support is fixed by the fixing portion so that the acquisition portion is positioned on the underside of the leaf rather than the surface of the leaf, extending from the underside of the leaf to the branch or trunk of the plant. The support structure further comprises a barrier that is fixed to the support and surrounds the acquisition portion, thereby enabling the creation of a space sandwiched between the support and the back surface of the leaf. The barrier has light-shielding properties. Support structure.

7. The barrier further comprises a wall-side fixing portion that fixes at least a portion of the part of the barrier opposite to the support to the underside of the leaf. The support structure according to claim 6.

8. The area of ​​the wall-side fixing portion is smaller than the total area of ​​the portion of the barrier opposite to the support. The support structure according to claim 7.

9. A support structure for positioning an acquisition unit, which acquires information about the state of a plant's leaves or the surrounding environment, near the leaves, A support that supports the acquisition part, The support comprises a fixing part for fixing it to the plant, The support is fixed by the fixing portion so that the acquisition portion is positioned on the underside of the leaf rather than the surface of the leaf, extending from the underside of the leaf to the branch or trunk of the plant. The support structure is fixed to the support and surrounds the acquisition portion, thereby providing a barrier that allows a space to be created between the support and the back surface of the leaf. The barrier includes a wall-side fixing portion that fixes at least a portion of the part opposite to the support to the underside of the leaf, The barrier further comprises an intervening portion that fills the gap between the portion opposite to the support and the underside of the leaf, The intervening portion has light-shielding properties. Support structure.

10. A support structure according to claim 1, 2, 6, or 9, A light source is supported in the portion of the support that is located on the underside of the leaf, The support comprises a leaf-side housing that accommodates the portion of the support located on the underside of the leaf together with the acquisition unit and the light source, The acquisition unit and the control device for controlling the light source, The support comprises a branch / trunk side housing that houses the portion of the support that is positioned on the branch or trunk side together with the control device and is fixed to the branch or trunk, system.

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