JP6992252B2 - Agricultural lighting equipment - Google Patents

Description

The present disclosure relates to agricultural lighting fixtures.

As a method for cultivating plants such as vegetables, for example, artificial cultivation in an agricultural house is known. It is also known to use lighting equipment to promote plant growth. For example, Patent Document 1 is a lighting unit for growing agricultural products including a light emitting diode light source and a reflector behind the light source, and the reflector contains a fine powder filler mainly composed of an aliphatic polyester resin and titanium oxide. It is disclosed for growing agricultural products including a reflective film formed from a resin composition.

Further, Patent Document 2 describes a method of cultivating a plant using a supplementary light device in a house using sunlight, in which the cultivation bench and / or the light supplement device is moved so that the relative positional relationship changes. Then, one or more cultivation benches are irradiated with light from one side or both sides of the cultivation bench by a light supplement device, and the cultivation plants of each cultivation bench are supplemented at a specific growth stage of the cultivation plant. A plant cultivation method characterized by irradiating with an optical device is disclosed.

Japanese Unexamined Patent Publication No. 2011-109921 Japanese Unexamined Patent Publication No. 2011-188788

Since the lighting unit described in Patent Document 1 uses a rigid reflector, installation conditions such as the angle of the reflector have a great influence on the reflectivity. Therefore, it is difficult to adjust the installation conditions for a rigid reflector.

The present disclosure has been made in view of the above circumstances, and the main purpose of the present disclosure is to provide an agricultural lighting fixture whose installation conditions can be easily adjusted.

One of the agricultural lighting fixtures of the present disclosure includes a reflective sheet containing a polyolefin resin and having a base sheet having visible light reflectivity, a flexible LED substrate located on one surface side of the reflective sheet, and a flexible LED substrate. It has a hanging member for suspending the reflective sheet.

The agricultural luminaire of the present disclosure has the effect that the installation conditions can be easily adjusted.

It is a schematic diagram which illustrates the agricultural lighting fixture of this disclosure. It is a schematic diagram explaining the effect of this disclosure. It is a schematic diagram which illustrates the reflective sheet in this disclosure. It is a schematic diagram which illustrates the reflective sheet in this disclosure. It is a schematic diagram which illustrates the reflective sheet in this disclosure. It is a schematic diagram which illustrates the reflective sheet in this disclosure. It is a schematic diagram which illustrates the reflective sheet in this disclosure. It is a schematic diagram which illustrates the flexible LED substrate in this disclosure. It is a schematic diagram which illustrates the agricultural lighting fixture of this disclosure. It is a schematic diagram which illustrates the agricultural lighting fixture of this disclosure. It is a schematic diagram explaining the agricultural lighting fixture of Example 1. FIG.

Hereinafter, the agricultural lighting fixtures disclosed in the present disclosure will be described in detail.

FIG. 1 is a schematic diagram illustrating the agricultural lighting equipment of the present disclosure. The agricultural lighting fixture 100 shown in FIG. 1 includes a reflective sheet 10 containing a polyolefin-based resin and having a base sheet having visible light reflectivity, and a flexible LED substrate 20 located on one surface side of the reflective sheet 10. , A hanging member 30 for suspending the reflective sheet 10.

According to the present disclosure, by combining a reflective sheet and a flexible LED substrate, it is possible to obtain an agricultural lighting fixture whose installation conditions can be easily adjusted. Specifically, since the reflective sheet is in the form of a sheet, it can be processed flexibly, and the flexible LED substrate can also be arranged so as to follow the shape of the base sheet. Therefore, the reflected light and the LED light can be delivered to a wide range, and the installation conditions of the luminaire can be easily adjusted.

Further, by combining the reflective sheet and the flexible LED substrate, the growth of plants can be effectively promoted. For example, as shown in FIG. 2A, the reflected light of the reflective sheet 10 is positively utilized in fine weather, and as shown in FIG. 2B, the flexible LED substrate 20 is positively used in rainy weather or at night. Can be used effectively. As described above, the agricultural lighting fixture of the present disclosure can effectively promote the growth of plants depending on the situation, and is useful as a supplementary lighting fixture.

Further, for example, since the lighting unit described in Patent Document 1 is arranged on the ground, the workability of agricultural work tends to be deteriorated. On the other hand, the agricultural lighting fixture of the present disclosure has a hanging member and is usually hung and used, so that deterioration of workability of agricultural work can be suppressed. Further, for example, since the reflective film described in Patent Document 1 contains an aliphatic polyester-based resin, film deterioration may occur due to hydrolysis of the aliphatic polyester-based resin. On the other hand, since the reflective sheet (reflective film) in the present disclosure contains a polyolefin-based resin, it has the advantages of excellent heat resistance, water resistance, and chemical resistance, and that film deterioration is unlikely to occur. Further, since the agricultural lighting fixture of the present disclosure is a lightweight lighting fixture in which a reflective sheet and a flexible LED substrate are combined, stress due to a load is applied to a support member that supports the hanging member, for example, a beam or girder of an agricultural house. There is an advantage of not giving.
The agricultural lighting fixtures of the present disclosure will be described for each configuration.

1. 1. Reflective Sheet The agricultural luminaire of the present disclosure has a reflective sheet containing a polyolefin-based resin and having a base sheet having visible light reflectivity. Reflective sheets are usually flexible. "Flexibility" means that when an object is wound into a roll having a diameter of 30 cm in an environment of room temperature (for example, 25 ° C), the object has flexibility to the extent that no creases are formed. Further, the "crease" is a deformation that appears in the object in a direction intersecting the direction in which the object is wound, and the object is wound in the opposite direction so as to undo the deformation. Is a deformation that cannot be restored.
Hereinafter, the shape and configuration of the reflective sheet will be described.

(1) Shape of Reflective Sheet The shape of the reflective sheet in the present disclosure is not particularly limited, and examples thereof include a three-dimensional structure. "Three-dimensional structure" means a three-dimensional structure. In particular, the reflective sheet preferably has a curved surface portion or a bent portion.

An example of the three-dimensional structure of the reflective sheet is a tubular structure. The "cylindrical structure" refers to a structure having a hollow. The tubular structure usually has two openings, but may have two or more openings. Examples of the shape of the opening include a polygonal shape such as a circular shape, an elliptical shape, a triangular shape, and a square shape.

Examples of the tubular structure include a columnar structure. The "columnar structure" refers to a structure in which the shapes of the two openings are the same among the tubular structures. Examples of the reflective sheet having a columnar structure include, as shown in FIG. 3 (a), a reflective sheet 10 having a columnar structure in which the shapes of the two openings 11 are the same, and FIG. 3 (b). ), The reflective sheet 10 having a quadrangular column structure in which the shapes of the two openings 11 are the same and square can be mentioned. In FIGS. 3A and 3B, the description of the flexible LED substrate is omitted for convenience. This point is the same in FIGS. 4 to 7. Examples of the columnar structure other than the columnar structure and the square columnar structure include an elliptical columnar structure; a polygonal columnar structure such as a triangular prismatic structure.

The tubular structure may have a structure in which the shapes of the two openings are similar to each other. Examples of the reflective sheet having such a tubular structure include, as shown in FIG. 4A, a reflective sheet 10 having a cylindrical structure having a circular shape in which the shapes of the two openings 11 are similar to each other. Be done. Further, as shown in FIG. 4A, when the angle formed by the straight line from the small opening 11 to the large opening 11 and the hypotenuse of the side surface of the reflective sheet 10 is θ, the value of θ is, for example, 5. It may be ° or more and 15 ° or less, and may be 8 ° or more and 12 ° or less. Further, in FIG. 4A, the agricultural lighting fixture 100 is suspended so that the small opening 11 is on the upper side and the large opening 11 is on the lower side, but in FIG. 4B, the large opening 11 is hung. The agricultural luminaire 100 is hung so that the small opening 11 is on the upper side and the small opening 11 is on the lower side.

Further, as another example of the three-dimensional structure of the reflective sheet, a cone structure can be mentioned. Examples of the reflective sheet having a cone structure include a reflective sheet 10 having a conical structure, as shown in FIG. Examples of the pyramid structure other than the conical structure include an elliptical pyramid structure; a polygonal pyramid structure such as a triangular pyramid structure and a quadrangular pyramid structure.

The size of the reflective sheet having a three-dimensional structure is not particularly limited, but when the agricultural lighting fixture is suspended, the width and depth are, for example, 25 cm or more and 50 cm or less, and 30 cm or more and 40 cm or less, respectively. preferable. The height is, for example, 30 cm or more and 100 cm or less, and preferably 40 cm or more and 80 cm or less. The method for manufacturing the reflective sheet having a three-dimensional structure is not particularly limited, and examples thereof include a method of cutting a planar reflective sheet into an appropriate shape and processing it with an adhesive or the like.

Further, the reflective sheet may be a reflective sheet 10 having a band-shaped structure, for example, as shown in FIG. The reflective sheet having a strip-shaped structure can be easily installed between adjacent strains. The size of the reflective sheet having a strip-shaped structure is not particularly limited, but when the agricultural lighting fixture is suspended, the width is, for example, 20 mm or more and 50 mm or less, and preferably 30 mm or more and 40 mm or less. The height is, for example, 200 mm or more and 1500 mm or less, and preferably 400 mm or more and 1000 mm or less.

Further, when the reflective sheet has a tubular structure, for example, as shown in FIG. 7A, the light L ₂ irradiated on the side surface of the reflective sheet 10 is reflected by the reflective sheet 10, but the reflective sheet 10 The light L1 that has entered the hollow portion from the opening ₁₁ is difficult to be used as reflected light.

From the viewpoint of increasing the utilization efficiency of the reflected light, for example, as shown in FIG. 7B, the agricultural luminaire 100 has an auxiliary opening 11 having at least one of the tubular structures covering at least a part of the opening 11. It may have a reflective sheet 12. In this case, the light L ₁ is reflected by the auxiliary reflective sheet 12 covering the opening 11 and does not enter the hollow portion. In particular, agricultural luminaires preferably have an auxiliary reflective sheet in the opening that is on the upper side when suspended. The auxiliary reflective sheet may cover 50% or more, 70% or more, or all of the opening when the opening is viewed in a plan view.

On the other hand, an auxiliary reflection sheet may be used in order to positively convert the light that has entered the hollow portion into the reflected light that is applied to the plant. For example, as shown in FIGS. 7 (c) and 7 (d), even if the agricultural luminaire 100 has an auxiliary reflective sheet 12 in a region extending from the opening 11 of the tubular structure to the inside (hollow portion). good. The agricultural lighting fixture 100 shown in FIGS. 7 (c) and 7 (d) extends from the opening 11 (the opening 11 on the lower side when suspended) to the inside (hollow portion) of the tubular structure. , Has an auxiliary reflective sheet 12 having a conical structure. In FIG. 7 (c), the tip of the auxiliary reflective sheet 12 is located inside the tubular structure, and in FIG. 7 (d), the tip of the auxiliary reflective sheet 12 is located outside the tubular structure. The auxiliary reflective sheet 12 penetrates the inside of the tubular structure. In these cases, the light L1 enters the inside of the tubular structure through the opening 11 which is the upper side when suspended, is reflected inside the tubular structure, and when suspended, the light L ₁ and the lower side. It advances to the outside world from the opening 11. The light is reflected by the auxiliary reflection sheet 12 and converted into reflected light that irradiates the plant.

Since the configuration of the auxiliary reflective sheet is the same as the configuration of the reflective sheet described later, the description here is omitted. It is preferable that the auxiliary reflective sheet and the reflective sheet having a tubular structure are made of the same material. The shape of the auxiliary reflective sheet is not particularly limited, but it is preferable to have the above-mentioned three-dimensional structure, strip-shaped structure, and the like.

(2) Structure of Reflective Sheet The reflective sheet may contain only a base sheet which contains a polyolefin resin and has visible light reflectivity, or may further have other members. Examples of other members include a reinforcing sheet described later.

(I) Base material sheet The base material sheet contains at least a polyolefin resin, and may further contain an additive such as a filler, if necessary.

(Polyolefin resin)
Polyolefin-based resins are excellent in heat resistance, water resistance, chemical resistance, and cost. Examples of the polyolefin-based resin used for the substrate sheet include homopolymers of olefins, copolymers of two or more types of olefins, one or more types of olefins, and one or more types of polymerizable monomers that can be polymerized with olefins. Examples thereof include the copolymer of the above. Examples of the olefin (monomer unit) include ethylene, propylene, butene, and hexene. Further, the copolymer may be a binary system, a ternary system, or a quaternary system. Further, the copolymer may be a random copolymer or a block copolymer.

Specific examples of the polyolefin-based resin include polyethylene-based resin, polypropylene-based resin, and the like, and polypropylene-based resin and the like are preferable. An example of a polypropylene-based resin is a propylene homopolymer. The propylene homopolymer preferably has isotactic or syndiotactic stereoregularity. Other examples of polypropylene-based resins include copolymers of propylene and other α-olefins. Examples of other α-olefins include ethylene, butene-1, hexene-1, heptene-1, and at least one of 4-methylpentene-1. The polypropylene-based resin preferably contains propylene as a main component of the monomer unit.

On the other hand, examples of the polyethylene-based resin include low-density polyethylene and high-density polyethylene. The polyethylene-based resin may be linear polyethylene. The polyethylene-based resin preferably contains ethylene as the main component of the monomer unit. Further, as the polyolefin-based resin, poly (4-methylpentene-1), poly (butene-1), ethylene-vinyl acetate copolymer and the like may be used.

The base material sheet may contain one kind of resin or may contain two or more kinds of resins. When two or more kinds of resins are used, it is preferable to use a polyolefin resin as a main component, and more preferably a polyethylene resin or a polypropylene resin as a main component. Further, the content of the resin in the base material sheet is, for example, 45% by mass or more, and may be 55% by mass or more. On the other hand, the content of the resin in the base sheet is, for example, 99% by mass or less, and may be 98% by mass or less.

(Filler)
The base sheet may contain a filler. In particular, the porous base material sheet preferably contains a filler. By adding a filler and stretching, for example, voids are created inside the sheet. Examples of the filler include an inorganic filler and an organic filler.

Examples of the inorganic filler include calcium carbonate such as heavy calcium carbonate and light calcium carbonate, calcined clay, talc, silicon oxide, diatomaceous earth, titanium oxide, magnesium oxide, zinc oxide, barium sulfate and the like. Further, the inorganic filler may be surface-treated with a fatty acid. Among them, the inorganic filler is preferably heavy calcium carbonate, light calcium carbonate, calcined clay or talc. This is because it is inexpensive and has good moldability.

The average particle size of the inorganic filler is, for example, 0.01 μm or more and 15 μm or less, and may be 0.01 μm or more and 8 μm or less. The average particle size is defined as a statistical average value of the particle size distribution measured on a volume basis, and means, for example, a value measured by LA-920 manufactured by Horiba Seisakusho Co., Ltd.

Examples of the organic filler include polyethylene terephthalate, polybutylene terephthalate, polycarbonate, polyamide, polyethylene naphthalate, polystyrene, melamine, polyethylene sulphite, polyimide, polyethyl ether ketone, polyether ether ketone, polyphenylene sulphite, and poly-4. -Methyl-1-pentene, polymethylmethacrylate and the like can be mentioned. The organic filler is a homopolymer of cyclic olefin or a copolymer of cyclic olefin and ethylene, and has a melting point of 120 ° C. or higher and 300 ° C. or lower or a glass transition temperature of 120 ° C. or higher and 280 ° C. or lower. Materials can also be used.

The content of the filler in the base sheet is, for example, 1% by mass or more and 65% by mass or less, and preferably 2% by mass or more and 55% by mass or less.

(Other additives)
The base material sheet may contain various additives such as a surfactant, a lubricant, and an antistatic material, if necessary. By adding a surfactant, for example, dew condensation can be prevented. Examples of the surfactant include nonionic surfactants, anionic surfactants, amphoteric surfactants and the like. Examples of the nonionic surfactant include glycerin fatty acid ester, pentaerythritol fatty acid ester, polyoxypropylene / polyoxyethylene block polymer and the like. Examples of the anionic surfactant include salts such as sulfonates and alkylbenzene sulfonates. Examples of the salt include sodium salt, potassium salt, ammonium salt and the like.

Examples of the lubricant include liquid paraffin, synthetic paraffin, aliphatic hydrocarbons such as microcrystalline wax, stearic acid ester of linear alcohol, and higher fatty acid amide. Examples of the antistatic material include alkyl diethanolamine, hydroxyalkyl monoethanolamine, glycerin fatty acid ester, polyglycerin fatty acid ester, alkyl sulfonic acid sodium, alkylbenzene sulfonic acid sodium, perchlorate tetraalkylammonium salt and the like. The content of the additive is not particularly limited and may be appropriately selected depending on the type of the additive.

(Base sheet)
The base sheet has visible light reflectivity. The visible light reflectance (average reflectance at a wavelength of 380 nm or more and 780 nm or less) of the base material sheet is, for example, 70% or more, preferably 80% or more, and more preferably 90% or more.

The base material sheet may be a sheet having voids inside or a sheet having no voids inside, but the former is preferable. In particular, the substrate sheet is preferably a porous substrate sheet. The porous base material sheet preferably exhibits visible light reflectivity due to its porous structure. The porosity of the porous base material sheet is not particularly limited, but is preferably 35% or more and 60% or less, and preferably 40% or more and 58% or less. If the porosity is too low, the light reflectivity may be low. If the porosity is too high, the sheet strength may be weakened.

The porosity refers to the ratio of voids to the porous substrate sheet, and can be calculated by the following formula 1.
Porosity (%) = {(ρo-ρ) / ρo} × 100 ... (Equation 1)
In formula 1, ρ is the density of the porous substrate sheet and conforms to JIS P 8118. ρo is the true density of the porous substrate sheet. The true density can be determined by analyzing the types of the main material components constituting the porous substrate sheet and their composition ratios, and using the general values of the types of material components. For example, the density of polypropylene is 0.9 g / cm ³ , and the density of calcium carbonate is 2.7 g / cm ³ . When the porous base material sheet is stretch-treated, the true density is substantially equal to the density of the material before stretching unless the material before stretching contains a large amount of air. Therefore, the true density may be obtained from the material before stretching, and can be obtained by a dry density measuring method by a constant volume expansion method. As a measuring device, for example, a dry automatic density meter Accupic manufactured by Shimadzu Corporation. 1330 is mentioned.

The average diameter of the voids is, for example, 1 μm or more and 50 μm or less, preferably 2 μm or more and 40 μm or less, and more preferably 5 μm or more and 30 μm or less. The diameter of the void is defined as [(L + M) / 2] obtained by measuring and averaging the maximum diameter (L) of the void and the maximum diameter (M) in the direction perpendicular to the maximum diameter (L). The diameters of at least n (n is an integer of 1 or more, preferably an integer of 100 or more) are measured, and the average value thereof is taken as the average diameter of the voids. For example, a scanning electron microscope S-2400 manufactured by Hitachi, Ltd. can be used for observing the cross section of the sample.

The thickness of the base material sheet is not particularly limited, but is preferably, for example, 30 μm or more and 90 μm or less, and preferably 40 μm or more and 80 μm or less. Further, the base material sheet may have a single-layer structure or a multi-layer structure. When the base material sheet has a multi-layer structure, the resin components contained in each layer may be the same or different. As an example of the base sheet having a multi-layer structure, it has an inner layer and two outer layers located on both sides of the inner layer, and the resin components contained in the two outer layers are the same, and the resin component contained in the outer layer Examples thereof include base material sheets having different resin components contained in the inner layer.

It is preferable that the base sheet has high smoothness. Specifically, the arithmetic mean height Sa of the surface of the base material sheet is, for example, 1 μm or less, preferably 0.7 μm or less, and more preferably 0.5 μm or less. Further, it is preferable that the base sheet has high antifouling property. Specifically, the contamination grade (JIS-L-1919) on the surface of the base material sheet is preferably 3 or more, and more preferably 3.5 or more.

The substrate sheet may have at least one of moisture permeability, breathability and water impermeability. Moisture permeability means the property of passing water as a gas, that is, water vapor, air permeability means the property of passing gas such as carbon dioxide, and water impermeability means the property of passing water as a liquid. It is a property that does not allow you to do so.

The method for producing the base material sheet is not particularly limited as long as it is a method for obtaining a desired sheet, and a known production method can be adopted.

(Ii) Reinforcing sheet The reflective sheet may have a reinforcing sheet for reinforcing the base sheet on one surface side of the base sheet.

The reinforcing sheet preferably contains a resin. The resin may be a thermoplastic resin or a thermosetting resin, but the former is preferable. In particular, the resin contained in the reinforcing sheet is preferably a polyolefin-based resin. This is because it is excellent in heat resistance, water resistance, chemical resistance, and cost. Further, the polyolefin-based resin may be, for example, a polyethylene-based resin or a polypropylene-based resin.

Further, it is preferable that both the reinforcing sheet and the base material sheet are polyolefin-based resin sheets containing a polyolefin-based resin as the resin. For example, when the adhesive layer described later is provided, the polyolefin-based resin has a common adhesiveness to the adhesive, so that a strongly bonded reflective sheet can be obtained. In addition, since the degree of expansion and contraction due to heat and moisture is close, warpage is unlikely to occur and the adhesive is not easily peeled off. The result is a highly durable reflective sheet. Further, since a polyolefin resin is used, the reflective sheet has high water resistance.

Further, it is preferable that the reinforcing sheet contains a polyethylene resin as a main component and the base sheet contains a polypropylene resin as a main component. This is because the workability of the reflective sheet is improved. Specifically, since polypropylene-based resin is a relatively hard resin, it is difficult to process it. On the other hand, since the polyethylene-based resin is a relatively soft resin, the processability of the reflective sheet is improved by combining the polypropylene-based resin and the polyethylene-based resin.

The reinforcing sheet may have a single-layer structure or a multi-layer structure. The thickness of the reinforcing sheet is not particularly limited, but is preferably, for example, 10 μm or more and 150 μm or less, and preferably 20 μm or more and 100 μm or less. When the reinforcing sheet has a multi-layer structure, it is preferable that the thickness of each layer constituting the reinforcing sheet is within the above-mentioned range. Further, the reflective sheet may have a reinforcing sheet on the outermost surface, or may have a reinforcing sheet inside.

The reflective sheet may have another layer between the base sheet and the reinforcing sheet, or may be in contact with the reflective sheet without having the other layer. Examples of the other layer include an adhesive layer. The thickness of the adhesive layer is, for example, 10 μm or less.

(Iii) Reflective sheet The reflective sheet has at least a base material sheet. The visible light reflectance (average reflectance at a wavelength of 380 nm or more and 780 nm or less) of the reflective sheet is, for example, 70% or more, preferably 80% or more, and more preferably 90% or more. In particular, when the reflective sheet has a three-dimensional structure, the visible light reflectance on the outer surface side of the reflective sheet is preferably in the above range.

The thickness of the reflective sheet is not particularly limited, but is preferably 70 μm or more and 250 μm or less, and preferably 100 μm or more and 200 μm or less.

2. 2. Flexible LED Substrate The agricultural lighting fixture of the present disclosure has a flexible LED substrate located on one surface side of the reflective sheet. Flexible LED substrates usually have flexibility. The flexibility is as described above.

A general flexible LED substrate can be used for the agricultural lighting equipment of the present disclosure. For example, as shown in FIG. 8, the flexible LED substrate 20 has at least a substrate 21 and an LED element 22 located on one surface side of the substrate 21. Although not shown, the flexible LED substrate may have a general wiring layer, an insulating layer, a sealing layer, and the like.

Examples of the substrate include a resin sheet and a glass sheet. Specific examples of the resin used in the resin sheet include polyimide, polyamide-imide, polynylon, polycarbonate, polyether sulfone, acrylic, polyethylene naphthalate, polyethylene terephthalate and the like. The thickness of the substrate is, for example, 10 μm or more and 100 μm or less.

Examples of the LED element include a light emitting semiconductor element that utilizes light emission at a PN junction to which a P-type semiconductor and an N-type semiconductor are bonded. In addition, an organic electroluminescence element is also included in the LED. The color of the LED element is not particularly limited, and may be any of a blue LED, a red LED, and a green LED. Further, two or more LED elements of each color may be used in combination. The plan view shape of the flexible LED substrate is not particularly limited, and examples thereof include a band shape.

Further, for example, the flexible LED board 20 shown in FIG. 8 is connected to the power cable 25, and the power cable 25 is connected to the plug 27. Further, when the power consumption of the LED element is high, the flexible LED board 20 may have a relay board 26 in the middle of the power cable 25. Further, by combining the flexible LED substrate 20 shown in FIG. 8 and the reflective sheet 10 shown in FIG. 4B, for example, the agricultural lighting fixture 100 shown in FIG. 9 can be obtained.

The agricultural lighting fixture 100 shown in FIG. 9 has a reflective sheet 10 having a three-dimensional structure, a flexible LED substrate 20 located on the outer surface side of the reflective sheet 10, and a hanging member 30 for suspending the reflective sheet 10. In FIG. 9, the power cable 25 connected to the flexible LED substrate 20 is used as the hanging member 30. The power cable 25 is fixed to the reflective sheet 10 by the adhesive tape 31. Further, although not shown, an adhesive layer may be provided between the reflective sheet 10 and the flexible LED substrate 20.

Further, the agricultural lighting fixture 100 shown in FIG. 9 has a flexible LED substrate 20 on the outer surface side of the reflective sheet 10 having a three-dimensional structure. On the other hand, when a through hole is provided in the reflective sheet having a three-dimensional structure, a flexible LED substrate can be arranged on the inner surface side of the reflective sheet so that the LED element is exposed from the through hole. That is, the agricultural lighting fixture has a three-dimensional structure and is located on the inner surface side of the reflective sheet and the reflective sheet having a through hole penetrating in the thickness direction, and the LED element is exposed from the through hole. It may have a flexible LED substrate and a hanging member for suspending the reflective sheet.

Further, when the reflective sheet has a three-dimensional structure, it is preferable that the agricultural lighting fixture of the present disclosure has a flexible LED substrate along the circumferential direction of the reflective sheet having the three-dimensional structure. On the other hand, when the reflective sheet has a strip-shaped structure, it is preferable that the agricultural lighting fixture of the present disclosure has a flexible LED substrate along the longitudinal direction of the reflective sheet having the strip-shaped structure. Further, the agricultural lighting fixture of the present disclosure may have a flexible LED substrate only on one side of the reflective sheet having a band-shaped structure, and may have a flexible LED substrate on both sides of the reflective sheet having a band-shaped structure. You may be doing it.

3. 3. Hanging member The agricultural lighting fixture of the present disclosure has a hanging member for suspending a reflective sheet. The hanging member is not particularly limited as long as it is a member capable of suspending the reflective sheet, and examples thereof include a string-shaped member, an elastic member (spring-shaped member, rubber-like member, etc.), and a rod-shaped member. In particular, when the hanging member is a string-shaped member or an elastic member, there is an advantage that the growth of the plant is not hindered as compared with the rigid rod-shaped member. For example, when a plant comes into contact with an agricultural luminaire due to the growth of a plant, an agricultural luminaire with a rigid rod-shaped member is likely to damage the plant, while an agricultural luminaire with a string-shaped member or an elastic member is used. It has the advantage of not damaging the plant and not inhibiting the growth of the plant. Examples of the material of the hanging member include resin, metal, wood and the like. Further, as shown in FIG. 9, the power cable 25 connected to the flexible LED substrate 20 may be used as the hanging member 30.

One end of the hanging member is fixed to the reflective sheet. As a method of fixing the hanging member to the reflective sheet, for example, a method of using an adhesive tape can be mentioned. Further, the hanging member and the reflective sheet may be fixed by providing a through hole in a part of the reflective sheet and connecting the hanging member which is a string-shaped member or an elastic member. Further, the hanging member may have a fixing tool such as a hook at the end. By passing the fixture through the through hole, the hanging member and the reflective sheet can be fixed. When the agricultural lighting fixture has the above-mentioned auxiliary reflection sheet, the hanging member may be fixed to the auxiliary reflection sheet.

The reflective sheet and the hanging member may be fixed at one place or at two or more places. As an example of the latter, as shown in FIG. 10, there is an agricultural lighting fixture 100 in which the reflective sheet 10 and the hanging member 30 are fixed at four places by the adhesive tape 31. The latter case has the advantage that it is easy to hold the agricultural luminaire horizontally. Although the description of the power cable connected to the flexible LED board 20 is omitted in FIG. 10, it may be arranged at an arbitrary position. Further, in the latter case, the reflective sheet and the hanging member may be fixed at two places, three places, or four or more places. Further, in FIG. 10, a plurality of hanging members 30 are integrated into one at the gathering point 32.

Further, the hanging member may be connected to a moving device for moving the reflective sheet. The moving device preferably has at least one of a function of moving the reflective sheet up and down along the vertical direction and a function of rotating the reflective sheet along the vertical axis. The moving device is not particularly limited, and a known device capable of moving the reflective sheet can be used.

4. Agricultural luminaires The agricultural luminaires of the present disclosure are luminaires used for any agricultural use. Above all, the agricultural lighting fixture of the present disclosure is preferably a lighting fixture used in an agricultural house. Further, the agricultural house may be a solar type agricultural house or an artificial light type agricultural house. The agricultural luminaires of the present disclosure also have the advantage that the installation conditions caused by the growth of plants are easy to adjust. The plant cultivated in the agricultural house may be a long-day plant (a plant that regulates flower bud formation in response to a long day) or a short-day plant (a plant that regulates flower bud formation in response to a short day). It may be a neutral plant (a plant that does not respond to a photoperiod). In particular, the agricultural lighting fixtures of the present disclosure are preferably used in an agricultural house for cultivating flowers.

The present disclosure is not limited to the above embodiment. The above embodiment is an example, and any one having substantially the same configuration as the technical idea described in the claims of the present disclosure and exhibiting the same function and effect is the present invention. Included in the technical scope of the disclosure.

[Example 1]
(Preparation of porous base material sheet)
As a resin composition constituting the inner layer of the porous base material sheet, a propylene homopolymer (manufactured by Japan Polychem Corporation, trade name "Novatec PP: MA-8", melting point 164 ° C.) is 65.5% by mass and high. Density polyethylene (manufactured by Japan Polychem Corporation, trade name "Novatec HD: HJ580", melting point 134 ° C., density 0.960 g / cm ³ ) is 6.5% by mass, and calcium carbonate having an average particle size of 1.5 μm. A resin composition containing 28% by mass of powder was obtained as an unstretched sheet using an extruder. Next, this unstretched sheet was stretched four times in the vertical direction to obtain a uniaxially stretched sheet.

On the other hand, as the resin composition constituting the outer layer of the porous base material sheet, the propylene homopolymer is 51.5% by mass, the high-density polyethylene is 3.5% by mass, and the average particle size is the same as the above. A resin composition consisting of 42% by mass of 1.5 μm calcium carbonate powder and 3% by mass of titanium oxide powder having an average particle size of 0.8 μm was melt-kneaded using another extruder, and the above uniaxially stretched sheet was used. Extruded from the die on both sides of the surface of the above, a laminated sheet having a layer structure of an outer layer, an inner layer, and an outer layer was obtained.

Next, by stretching this laminated sheet 7 times in the lateral direction and slitting the selvage portion, the thickness is 70 μm, and the layer structure of the outer layer (15 μm), the inner layer (40 μm), and the outer layer (15 μm) is fine. A porous base material sheet containing voids was obtained. The porosity of the obtained porous base material sheet was 55%, and the opacity was 93%.

(Making a reflective sheet)
As a reinforcing sheet, an L-LDPE film (linear low-density polyethylene film, thickness 30 μm, TUX TC-S, manufactured by Mitsui Chemicals Toshiro Co., Ltd.) was prepared, and the reinforcing sheet and the porous base material sheet were prepared by the dry laminating method. Joined. Specifically, Takelac A-969V (polyol component) and Takenate A-5 (isocyanate component) were used as the polyether adhesive. A polyether adhesive was applied under the conditions of a drying temperature of 70 ° C. and 2 g / m ² , and bonded. In this way, a reflective sheet was obtained.

The obtained reflective sheet was subjected to reflectance measurement, smoothness evaluation and antifouling property evaluation. In the visible light reflectance measurement, the reflectance (total reflectance) is measured at an incident angle of 8 ° using an ultraviolet / visible / near-infrared spectrophotometer (Shimadzu UV-3600) and an integrating sphere accessory (ISR-3100). Was measured. As the standard plate, Spectralon (manufactured by Teflon (registered trademark)) manufactured by Lovesphere Inc. of the United States was used. The measurement surface was the surface of the reflective sheet on the porous substrate sheet side. The average visible light reflectance at a wavelength of 380 nm or more and 780 nm or less was 95% or more, and it was confirmed that the visible light necessary for growing plants was sufficiently reflected. On the other hand, in the smoothness evaluation, the calculated average height Sa of the surface on the porous substrate sheet side was obtained. As a result, Sa was 0.3 μm. In the antifouling property evaluation, the contamination grade was evaluated based on JIS-L-1919. As a result, the contamination grade was 3.5.

(Manufacturing of flexible LED substrate)
The obtained reflective sheet was cut into the shape shown in FIG. The flexible LED substrate 20 was attached to the surface of the cut reflective sheet 10. Then, the reflective sheet 10 was rolled so that the flexible LED substrate 20 faced outward, and an adhesive tape was attached and fixed to the inside of the reflective sheet 10. As a result, the agricultural lighting fixture 100 having the tubular structure shown in FIG. 9 was produced. It should be noted that each reference numeral in FIG. 11 is the same as each reference numeral in FIG.

10 ... Reflective sheet 20 ... Flexible LED board 30 ... Hanging member 100 ... Agricultural lighting equipment

Claims (10)

A reflective sheet having a base sheet having visible light reflectivity, and a reflective sheet.
A flexible LED substrate located on one surface side of the reflective sheet,
The hanging member that suspends the reflective sheet and
Have,
The reflective sheet has a three-dimensional structure and has a three-dimensional structure.
The flexible LED substrate is arranged on the outer surface side of the three-dimensional structure.
The flexible LED substrate is an agricultural lighting fixture having at least a substrate and an LED element located on one surface side of the substrate, and the substrate is a resin sheet or a glass sheet . The agricultural lighting fixture according to claim 1, wherein the three-dimensional structure is a cylindrical structure. The agricultural lighting fixture according to claim 2, further comprising an auxiliary reflective sheet covering at least a part of the opening in at least one opening of the tubular structure. The agricultural lighting fixture according to claim 2, further comprising an auxiliary reflective sheet in a region extending from the opening of the tubular structure to the inside. The agricultural lighting fixture according to claim 1, wherein the three-dimensional structure is a conical structure. The agricultural lighting fixture according to any one of claims 1 to 5, wherein the base sheet has a visible light reflectance of 90% or more. The agricultural lighting fixture according to any one of claims 1 to 6, wherein the base sheet is a porous base sheet. The agricultural lighting fixture according to any one of claims 1 to 7, wherein the reflective sheet contains a polyolefin-based resin. The agricultural lighting fixture according to claim 8, wherein the polyolefin-based resin is a polypropylene-based resin. The base sheet is a porous base sheet, and the base sheet is a porous base sheet.
The polyolefin-based resin is a polypropylene-based resin,
The agricultural lighting fixture according to claim 8, wherein the porous base sheet has a porosity of 35% or more and 60% or less, and the thickness of the porous base sheet is 30 μm or more and 90 μm or less.

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