JP2019140968A - Freshness preserving method, freshness preserving device, storage, and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a freshness maintaining method capable of appropriately maintaining the freshness of an agricultural product after harvesting and improving the visibility of the agricultural product. A method for maintaining freshness is a method for maintaining freshness by irradiating a crop after harvesting with irradiation light. The irradiation light has a first peak wavelength in a wavelength range of 400 nm or more and 480 nm or less, a second peak wavelength in a wavelength range of 500 nm or more and 650 nm or less, and a third peak wavelength in a wavelength range of 700 nm or more and 750 nm or less. The intensity of the third peak wavelength of the irradiation light is 5% or more of the intensity of the first peak wavelength of the irradiation light. [Selection diagram] Fig. 1

Description

  The present invention relates to a freshness holding method, a freshness holding device, a storage, and a display device for holding freshness of vegetables, fruits and the like by light irradiation.

  Conventionally, a method for maintaining the freshness of a crop by irradiating the crop after harvesting with red light or the like is known. For example, Patent Document 1 discloses a freshness maintaining method in which red light and far red light are irradiated simultaneously or alternately on a strawberry or the like.

JP 2016-26484 A

  However, in the freshness maintaining method according to Patent Document 1, the case where white light is present has not been studied, and it is unclear whether the same effect of maintaining freshness can be obtained even in the presence of white light.

  And when only red light and far-red light are irradiated like the freshness maintenance method which concerns on patent document 1, since the illuminated agricultural product will appear reddish, the visibility of agricultural products will fall. Therefore, there is a risk that the working efficiency of a person who works on such a crop will be reduced. In addition, when it is incorporated into a display device for fresh food such as a supermarket, the fresh food does not look natural, so there is a risk that the user's willingness to purchase such as a supermarket may be reduced.

  The present invention has been made in view of such problems. An object of the present invention is to provide a freshness holding method, a freshness holding device, a storage, and a display device that can appropriately maintain the freshness of the crop after harvesting and can improve the visibility of the crop.

  In order to solve the above problems, a freshness maintaining method according to the present invention is a freshness maintaining method in which irradiated crops are irradiated with irradiation light, and the irradiation light has a first peak wavelength in a wavelength range of 400 nm to 480 nm. And a second peak wavelength in a wavelength range of 500 nm to 650 nm and a third peak wavelength in a wavelength range of 700 nm to 750 nm, and the intensity of the third peak wavelength of the irradiation light is the intensity of the irradiation light 5% or more of the intensity of the first peak wavelength.

  In addition, the freshness maintaining apparatus according to the present invention is a freshness maintaining apparatus that irradiates the harvested crop with irradiation light, and has a first peak wavelength in a wavelength range of 400 nm to 480 nm and a wavelength range of 500 nm to 650 nm. An irradiation unit configured to irradiate irradiation light having a second peak wavelength and a third peak wavelength in a wavelength range of 700 nm to 750 nm; and the intensity of the third peak wavelength of the irradiation light is the first peak wavelength of the irradiation light. It is 5% or more of the intensity of one peak wavelength.

  Further, a storage according to the present invention includes the above-described freshness maintaining device and a housing for storing agricultural products.

Moreover, the display apparatus which concerns on this invention is provided with the above-mentioned freshness holding apparatus and the shelf on which agricultural products are displayed.

  If the freshness keeping method, freshness keeping device, storage, and display device according to the present invention are used, the freshness of the crop after harvesting can be appropriately kept and the visibility of the crop can be improved.

Schematic perspective view of the appearance of the storage room according to Embodiment 1 The block diagram which shows an example of a function structure of the freshness holding apparatus with which the storage which concerns on Embodiment 1 is equipped. Schematic perspective view of the appearance of the display device according to Embodiment 2 Typical sectional drawing when the display device according to Embodiment 2 is viewed from the side The block diagram which shows an example of a function structure of the freshness holding apparatus with which the display apparatus which concerns on Embodiment 2 is provided. Schematic perspective view showing the configuration of an example of a light emitting module

  Hereinafter, a freshness holding method, a freshness holding device, a storage, and a display device according to embodiments will be described in detail with reference to the drawings. In addition, each embodiment described below shows an example of the present invention, and numerical values, materials, shapes, components, operations, and the like are only examples, and are intended to limit the present invention. is not.

  Each figure is a mimetic diagram and is not necessarily illustrated strictly. Moreover, in each figure, about the substantially same structure, the same code | symbol is attached | subjected and the overlapping description may be abbreviate | omitted or simplified.

(Embodiment 1)
Below, the freshness holding | maintenance apparatus 10 and the storage 100 which concern on Embodiment 1 are demonstrated using FIG. 1 and 2. FIG. FIG. 1 is a schematic perspective view of the appearance of the storage case according to Embodiment 1. FIG. FIG. 2 is a block diagram illustrating an example of a functional configuration of the freshness maintaining device included in the storage according to Embodiment 1.

[Constitution]
A storage 100 shown in FIG. 1 is a storage that stores (stores) the crop 30 after storage, and is installed, for example, in a backyard of a store that sells the crop 30. The storage 100 includes a housing 20, a door 22, and a freshness holding device 10.

  The casing 20 has a substantially rectangular parallelepiped shape, and the crop 30 is taken in and out from the front in a rectangular parallelepiped storage portion 21 (storage space) that is a space inside the casing 20. The housing 20 is made of, for example, a metal such as aluminum, but may be made of a resin. In addition, the shape of the housing | casing 20, the material of the housing | casing 20, etc. are examples, and are not specifically limited.

  A door 22 (cover) that can be freely opened and closed is provided in front of the storage unit 21. When the door 22 is closed and the first irradiation unit 13 and the second irradiation unit 14 are turned off, the inside of the storage unit 21 becomes a dark room (an environment of 0 lux).

  The freshness holding device 10 is a device for holding the freshness of the crop 30 after harvesting. As shown in FIGS. 1 and 2, the freshness maintaining device 10 includes a power plug 11, a controller 12, a first irradiation unit 13, and a second irradiation unit 14.

  The power plug 11 is an example of a power receiving unit, and includes a terminal unit 11a and a power conversion unit 11b. The power plug 11 is a so-called AC adapter.

  The terminal portion 11a is a metal terminal that is inserted into an outlet. The shape and material of the terminal portion 11a are not particularly limited.

  The power conversion unit 11 b converts the AC power received by the terminal unit 11 a into DC power, and supplies the DC power to the controller 12, the first irradiation unit 13, and the second irradiation unit 14. Specifically, the power conversion unit 11b is an AC-DC converter circuit. In the storage 100, the power conversion unit 11b is disposed outside the housing 20, but the power conversion unit 11b may be built in the housing 20.

  The first irradiation unit 13 is an irradiation device that is disposed above the storage unit 21 and irradiates the crop 30 stored in the storage unit 21 with far-red light based on the control of the controller 12. Here, the far-red light is light having a wavelength peak (third peak wavelength) in a wavelength range of 700 nm or more and 750 nm or less. For the far-red light, for example, light having a wavelength peak in the wavelength range of 700 nm to 750 nm and the entire emission spectrum in the range of 400 nm to 1000 nm may be used.

  Specifically, the first irradiation unit 13 is a light emitting module including a substrate and a plurality of far-red light LEDs (Light Emitting Diodes) mounted on the substrate, but can emit far-red light. Any mode may be used. For example, a light emitting element that emits light having a light emission peak other than far red and a spectral filter may be combined to emit only far red light.

  In addition, in FIG. 1, although the 1st irradiation part 13 was represented by the light bulb type, this was only represented typically and the shape of the 1st irradiation part 13 is not limited to this. For example, the first irradiation unit 13 may be configured to emit surface light using a light guide plate or the like. Alternatively, the first irradiation unit 13 may have a shape such as a pendant light or a downlight.

  Here, it is preferable that the first irradiation unit 13 irradiates the crop 30 with uniform far-red light. Since it is considered that far-red light mainly affects the maintenance of freshness, the freshness of the crop 30 can be efficiently retained by irradiating the far-red light uniformly. Examples of a method of uniformly irradiating the crop 30 with far-red light include a method using surface light emission by a light guide plate, a milky white plate, or the like, a method of arranging the light sources of the first irradiation unit 13 in a matrix, and the like. In addition, as a milky white board, what combined the reflection sheet, the acrylic board, and the diffusion board etc. can be used.

  Note that the far red light (the emission spectrum of far red light) irradiated by the first irradiation unit 13 typically has one peak, but may have two or more peaks having different wavelengths. For example, in the first embodiment, the first irradiation unit 13 irradiates far red light having a peak wavelength of 720 nm or far red light having a peak wavelength of 735 nm, but the first irradiation unit 13 has a wavelength of 720 nm. It is good also as a structure which irradiates far-red light which has a peak in both of 735 nm. In this case, for example, the 1st irradiation part 13 can be set as the structure by which the far-red light LED of peak wavelength 720nm and the far-red light LED of peak wavelength 735nm were mounted on the board | substrate.

The second irradiation unit 14 is disposed above the storage unit 21 and irradiates the crop 30 stored in the storage unit 21 with mixed color light based on the control of the controller 12. Here, the mixed color light is light having a wavelength peak (first peak wavelength) in a wavelength range of 400 nm to 480 nm and a wavelength peak (second peak wavelength) in a wavelength range of 500 nm to 650 nm. is there. The mixed color light includes, for example, a wavelength range of 400 nm to 480 nm and 500 nm to 6 nm.
Light having a wavelength peak in the wavelength range of 50 nm or less and the entire emission spectrum included in the range of 380 nm to 800 nm can be used.

  The second irradiation unit 14 is, for example, a light emitting module having a COB (Chip On Board) structure including a substrate, a plurality of blue LEDs mounted directly on the substrate, and a sealing member containing yellow phosphor particles. . The sealing member seals the blue LED. As the yellow phosphor particles, for example, yttrium / aluminum / garnet (YAG) phosphors can be used. The second irradiation unit 14 may be an SMD (Surface Mount Device) type light emitting module or a remote phosphor type light emitting module.

  The second irradiation unit 14 may be in any form as long as it emits light having a wavelength peak in a wavelength range of 400 nm to 480 nm and a wavelength range of 500 nm to 650 nm. For example, you may comprise combining the light emitting element which emits blue lights, such as blue LED, and the light emitting element which emits green light and yellow light, such as green LED and yellow LED. Alternatively, a combination of a white light source and a spectral filter may be configured to emit light having a wavelength peak in a wavelength range of 400 nm to 480 nm and a wavelength range of 500 nm to 650 nm.

  In addition, in FIG. 1, although the 2nd irradiation part 14 was represented by the light bulb type, this was only represented typically and the shape of the 2nd irradiation part 14 is not limited to this. For example, the 2nd irradiation part 14 is good also as a structure which carries out surface emission using a light-guide plate etc. Alternatively, the second irradiation unit 14 may have a shape such as a pendant light or a downlight.

  Moreover, the 2nd irradiation part 14 is not restricted to what has a wavelength peak one each in the wavelength range of 400 nm or more and 480 nm or less and the wavelength range of 500 nm or more and 650 nm or less. For example, a combination of a light emitting element that emits blue light, green phosphor particles, and yellow phosphor particles has a total of two or more wavelength peaks in a wavelength range of 400 nm to 480 nm and a wavelength range of 500 nm to 650 nm. It is good as a simple configuration.

  The first irradiation unit 13 and the second irradiation unit 14 may be configured as one irradiation unit. For example, when such an irradiating unit is configured with a COB structure, the far-red light LED and the blue LED on the substrate are sealed with a sealing material containing yellow phosphor particles or green phosphor particles. It can be configured. Or you may comprise by combining far red light LED, blue LED, yellow LED, and green LED.

  The mixed light emitted by the second irradiation unit 14 has a second peak wavelength in a wavelength range of 500 nm to 550 nm, and further has a wavelength peak (fourth peak wavelength) in a wavelength range of 600 nm to less than 700 nm. Is more preferable. This is because the visibility of the crop 30 is improved by improving the color rendering property of the irradiation light in which the emitted light of the first irradiation unit 13 and the second irradiation unit 14 is mixed.

  In this case, when the second irradiation unit 14 is configured with a COB structure, for example, the blue LED and the red LED on the substrate are sealed with a sealing member containing green phosphor particles. Can do. Alternatively, a white light source and a spectral filter may be combined to emit light having wavelength peaks in a wavelength range of 400 nm to 480 nm, a wavelength range of 500 nm to 550 nm, and a wavelength range of 600 nm to less than 700 nm. .

Also in this case, the first irradiation unit 13 and the second irradiation unit 14 may be configured as one irradiation unit. For example, when the irradiation unit is configured with a COB structure, the far red light LED, the blue LED, and the red LED on the substrate are sealed with a sealing member containing green phosphor particles. be able to. Or you may comprise by combining a far red light LED, blue LED, red LED, and green LED.

  The installation positions of the first irradiation unit 13 and the second irradiation unit 14 are not limited to the upper side of the storage unit 21. For example, the 1st irradiation part 13 and the 2nd irradiation part 14 are good also as a structure installed in the side surface and bottom face of the accommodating part 21. FIG. In addition, the first irradiation unit 13 is installed on the ceiling surface of the storage unit 21, and the second irradiation unit 14 is installed on the side surface of the storage unit 21. May be installed at different positions.

  The controller 12 is an example of a control unit, and is a controller that controls the first irradiation unit 13 and the second irradiation unit 14 based on a user operation. For example, the controller 12 controls the intensity of the far red light irradiated by the first irradiation unit 13 and the irradiation time of the far red light irradiated by the first irradiation unit 13. The controller 12 controls, for example, on / off of irradiation of the first irradiation unit 13 and on / off of irradiation of the second irradiation unit 14. The controller 12 may control the intensity of the mixed light emitted by the second irradiation unit 14.

  Specifically, the controller 12 includes a PWM (Pulse Width Modulation) control circuit (dimming circuit) for controlling the illuminance of the first irradiation unit 13 and a timer circuit for controlling the irradiation time of the first irradiation unit 13. Etc. The controller 12 may be configured by a processor or a microcomputer. In the storage 100, the controller 12 is disposed outside the housing 20, but part or all of the controller 12 may be built in the housing 20.

  Although the controller 12 is not essential, the freshness maintaining device 10 preferably has the controller 12. Further, the controller that controls the intensity of the far red light and the controller that controls the irradiation time of the far red light may be configured as separate controllers. Further, the controller 12 may be configured integrally with the first irradiation unit 13 or the second irradiation unit 14. The specific aspect of the controller 12 is not particularly limited, and a conventionally known controller may be used as the controller 12.

  The storage 100 may include a cooling device that cools the inside of the storage unit 21. Of course, the cooling device is not an essential component.

  Moreover, when the storage 100 is provided with the big accommodating part 21, you may provide the belt conveyor which moves the crop 30. FIG. In this case, it can be set as the structure which the crop 30 which moved below the 1st irradiation part 13 by the movement of a belt conveyor receives irradiation of far-red light in order.

[Operation of freshness maintaining device]
Next, the operation (freshness holding method) of the freshness holding device 10 will be described.

  The freshness holding device 10 irradiates the harvested crop 30 with irradiation light based on the control of the controller 12. Here, the irradiation light means a first peak wavelength in a wavelength range of 400 nm to 480 nm, a second peak wavelength in a wavelength range of 500 nm to 650 nm, and a third peak wavelength in a wavelength range of 700 nm to 750 nm. It has light. In this irradiation light, the intensity of the third peak wavelength is 5% or more of the intensity of the first peak wavelength.

In the first embodiment, the irradiation light is light in which far-red light emitted from the first irradiation unit 13 and mixed light emitted from the second irradiation unit 14 are combined. Irradiation light emitted from the freshness holding device 10 is white light.

  As described above, the irradiation light may be light having a second peak wavelength in a wavelength range of 500 nm to 550 nm and a fourth peak wavelength in a wavelength range of 600 nm to less than 700 nm. With this configuration, the color rendering property of the irradiation light is improved, and the visibility of the crop 30 illuminated by the irradiation light is improved.

  In the freshness maintaining apparatus 10, it is preferable that the intensity and irradiation time of light having the third wavelength peak can be controlled separately from the intensity and irradiation time of light having other wavelength peaks. The far-red light mainly contributing to maintaining the freshness of the crop 30 and the mixed light necessary for improving the visibility of the crop 30 can be controlled separately, although the contribution to maintaining the freshness of the crop 30 is small. This is because it is possible to maintain appropriate freshness according to the installation location.

  Here, when the color temperature of the irradiation light is a high color temperature of 5600K or more and 7000K or less as called daylight color, from the viewpoint of maintaining the freshness of the crop 30, the intensity of the third peak wavelength of the irradiation light is the first peak wavelength. The strength is preferably 5% or more.

  On the other hand, when the color temperature of the irradiation light is a color temperature of 4000 K or more and less than 5600 K, which is called lunch white, from the viewpoint of maintaining the freshness of the crop 30, the intensity of the third peak wavelength of the irradiation light is the first peak wavelength. The strength is preferably 8% or more of the strength.

  In addition, when the color temperature of the irradiation light is a low color temperature of 2000 K or more and less than 4000 K as called warm white or light bulb color, from the viewpoint of maintaining the freshness of the crop 30, the intensity of the third peak wavelength of the irradiation light is It is preferably 10% or more of the intensity of the first peak wavelength.

  The freshness maintaining device 10 preferably irradiates light having the third peak wavelength for 5 minutes or more per day. By irradiating the far red light for 5 minutes or more per day, the freshness maintaining effect can be improved as will be described later.

  From the viewpoint of maintaining the freshness of the crop 30, the freshness maintaining device 10 preferably repeatedly irradiates the light having the third peak wavelength a plurality of times, and further, the irradiation interval time of the light having the third peak wavelength is the third peak. More preferably, it is longer than the irradiation time of the light having a wavelength.

In addition, from the viewpoint of maintaining the freshness of the crop 30, it is preferable that the integrated light amount in the range of 700 nm to 750 nm of irradiation light is 30 J / m ² or more per day. The irradiation conditions described above will be described in more detail in the items of the examples.

  Moreover, it is preferable to irradiate the far red light which is light which has a 3rd peak wavelength to the part with many pores of the crop 30. The part where there are many pores is, for example, a leaf part of vegetables and the like, in particular, the back side of the leaf. It is presumed that the pores move in the closing direction by the irradiation of the far red light, and it is assumed that the evaporation of moisture from the inside of the crop 30 is suppressed. Therefore, the far red light is irradiated to the portion where the pores of the crop 30 exist as described above. By doing, the freshness of the crop 30 can be hold | maintained efficiently.

[Effects]
Here, the main points of the freshness holding device 10 and the storage 100 according to the first embodiment will be described again. Further, since the present invention is also useful for the freshness maintaining method, the freshness maintaining method according to the embodiment will be described below.

  The freshness keeping method according to the embodiment is a freshness keeping method for irradiating irradiated crops with irradiation light. The irradiation light has a first peak wavelength in a wavelength range of 400 nm to 480 nm, a second peak wavelength in a wavelength range of 500 nm to 650 nm, and a third peak wavelength in a wavelength range of 700 nm to 750 nm. The intensity of the third peak wavelength of the irradiation light is 5% or more of the intensity of the first peak wavelength of the irradiation light.

  If the freshness maintenance method which has the said structure is used, the freshness of the crop 30 after a harvest can be hold | maintained appropriately, and the visibility of the crop 30 can be improved.

  In the freshness maintaining method according to the embodiment, the second peak wavelength exists in a wavelength range of 500 nm to 550 nm, and the irradiation light further has a fourth peak wavelength in a wavelength range of 600 nm to less than 700 nm. Is preferred.

  Since the color rendering property of irradiation light can be improved by the said structure, the visibility of the crop 30 illuminated by irradiation light can be improved.

  In the freshness maintaining method according to the embodiment, the irradiation light preferably has a color temperature of 5600K to 7000K. Alternatively, in the freshness maintaining method according to the embodiment, the irradiation light has a color temperature of 4000 K or more and less than 5600 K, and the intensity of the third peak wavelength of the irradiation light is 8% or more of the intensity of the first peak wavelength of the irradiation light. It is also preferable. Alternatively, in the freshness maintaining method according to the embodiment, the irradiation light has a color temperature of 2000 K or more and less than 4000 K, and the intensity of the third peak wavelength of the irradiation light is 10% or more of the intensity of the first peak wavelength of the irradiation light. It is also preferable.

  With the above configuration, the freshness of the crop 30 after harvesting can be appropriately maintained, and at the same time, the visibility of the crop 30 can be particularly improved.

  In the freshness maintaining method according to the embodiment, it is preferable that the irradiation light is irradiated with light having the third peak wavelength for 5 minutes or more per day.

  With the above configuration, the visibility of the crop 30 can be particularly improved, and at the same time, the freshness of the crop 30 after harvesting can be more efficiently maintained.

  In the freshness maintaining method according to the embodiment, it is preferable that irradiation light is repeatedly irradiated with light having a third peak wavelength a plurality of times.

  With the above configuration, the visibility of the crop 30 can be particularly improved, and at the same time, the freshness of the crop 30 after harvesting can be more efficiently maintained.

  In the freshness maintaining method according to the embodiment, in the irradiation light, the irradiation interval time of the light having the third peak wavelength is preferably longer than the irradiation time of the light having the third peak wavelength.

  With the above configuration, the visibility of the crop 30 can be particularly improved, and at the same time, the freshness of the crop 30 after harvesting can be more efficiently maintained.

Further, in the freshness maintaining method according to the embodiment, it is preferable that the integrated light amount in the range of 700 nm or more and 750 nm or less of the irradiation light is 30 J / m ² or more per day.

With the above configuration, the visibility of the crop 30 can be particularly improved, and at the same time, the freshness of the crop 30 after harvesting can be more efficiently maintained.

  The freshness holding device 10 according to the first embodiment is a freshness holding device that irradiates the crops after harvesting with irradiation light. Then, irradiation light having a first peak wavelength in a wavelength range of 400 nm to 480 nm, a second peak wavelength in a wavelength range of 500 nm to 650 nm, and a third peak wavelength in a wavelength range of 700 nm to 750 nm is irradiated. An irradiation unit is provided. And the intensity | strength of the 3rd peak wavelength of irradiated light is 5% or more of the intensity | strength of the 1st peak wavelength of irradiated light.

  If the freshness holding apparatus 10 having the above configuration is used, the freshness of the crop 30 after harvesting can be appropriately maintained, and the visibility of the crop 30 can be improved.

  In addition, the freshness maintaining apparatus 10 according to Embodiment 1 has a second peak wavelength in the wavelength range of 500 nm to 550 nm, and the irradiation light further has a fourth peak wavelength in a wavelength range of 600 nm to less than 700 nm. It is preferable to have.

  Since the color rendering property of irradiation light can be improved by the said structure, the visibility of the crop 30 illuminated by irradiation light can be improved.

  A storage 100 according to Embodiment 1 includes a freshness holding device 10 and a housing 20 that stores a crop 30.

  If the storage 100 having the above configuration is used, the freshness of the crop 30 can be appropriately maintained while the crop 30 after harvesting is stored, and the visibility of the crop 30 can be improved.

(Embodiment 2)
Below, the display apparatus 200 which concerns on Embodiment 2 of this invention is demonstrated using FIGS. FIG. 3 is a schematic perspective view of the appearance of the display device according to the second embodiment. FIG. 4 is a schematic cross-sectional view of the display device according to Embodiment 2 when viewed from the side. FIG. 5 is a block diagram illustrating an example of a functional configuration of a freshness maintaining device included in the display device according to the second embodiment. FIG. 6 is a schematic perspective view illustrating a configuration of an example of the light emitting module.

  In the following description, the description overlapping with the description in Embodiment 1 is omitted or simplified. The same components as those in the first embodiment will be described with the same reference numerals.

[Constitution]
The display device 200 is a display device having a plurality of shelves 202 on which the harvested crops 30 are displayed (placed). For example, the display device 200 is installed at a sales floor of a store that sells the crops 30. The display device 200 includes a main body unit 201, a shelf 202, a base unit 203, and a freshness holding device 210.

  The main body 201 forms a space for accommodating the crop 30. The main body 201 includes a side plate, a top plate, a rear plate, a frame for holding these, and the front of the main body 201 is open. Specifically, the main body 201 is made of a metal such as aluminum or iron, and a resin.

  The shelf 202 is a plate-like member that divides the space formed by the main body 201 in the vertical direction and displays the harvested crops 30 on the upper surface. The main body 201 has three shelves 202. The shelf 202 is specifically formed of a metal such as aluminum or iron, but may be formed of resin.

  The base portion 203 is a portion that becomes a base of the display device 200, and a controller 212 included in a freshness maintaining device 210 described later is attached to the base portion 203. In addition, the power conversion unit 211 b included in the freshness holding device 210 is accommodated in the base unit 203.

  The freshness holding device 210 includes a power plug 211, a power conversion unit 211b, a controller 212, and an irradiation unit 213.

  The power plug 211 is an example of a power receiving unit, has a metal terminal that is inserted into an outlet, and receives AC power from the terminal.

  The power conversion unit 211 b converts the AC power received by the power plug 211 into DC power, and supplies the DC power to the controller 212 and the irradiation unit 213. Specifically, the power conversion unit 211b is an AC-DC converter circuit. In the display device 200, the power conversion unit 211b is built in the base unit 203.

  The controller 212 is an example of a control unit, and controls the irradiation unit 213 based on a user operation. The controller 212 includes, for example, a timer circuit that controls the intensity of the far red light emitted by the irradiation unit 213 and the irradiation time of the far red light emitted by the irradiation unit 213. The controller 212 may be configured by a processor, a microcomputer, or the like.

  Further, the controller 212 controls, for example, turning on and off the irradiation of the far red light of the irradiation unit 213 and turning on and off of the irradiation of the mixed light of the irradiation unit 213. The controller 212 may control the intensity of the mixed light emitted by the irradiation unit 213.

  The irradiation unit 213 is arranged above each shelf 202 and irradiates the crop 30 displayed on the shelf 202 with irradiation light based on the control of the controller 212. As shown in FIG. 4, the irradiation unit 213 includes a base 213e, a light emitting module 213c that is a substrate 213a on which the LEDs 213b are mounted, and a diffusion cover 213d.

  The base 213e is a mounting base and a heat sink for the light emitting module 213c, and also functions as a member for mounting the irradiation unit 213 to the shelf 202. The base 213e is formed of a metal such as aluminum die cast, for example.

  The diffusion cover 213d diffuses and transmits the irradiation light emitted from the light emitting module 213c, and irradiates the crop 30 with the irradiation light.

  The light emitting module 213c is a substrate 213a on which the LED 213b is mounted. Hereinafter, the structure of the light emitting module 213c will be described in detail with reference to FIG.

  As shown in FIG. 6, in more detail, the light emitting module 213c includes a substrate 213a, a plurality of LEDs 213b mounted on the substrate 213a in a line, a wiring 223, a connector 224, and a connector 225.

The substrate 213a is a long rectangular substrate. The substrate 213a is a CEM-3 (Composite Epoxy Material-3) substrate having a resin as a base material, but may be another resin substrate, a metal base substrate, or a ceramic substrate. Examples of other resin substrates include FR-4 (Frame Returnant-4) substrates. Examples of the ceramic substrate include an alumina substrate made of aluminum oxide (alumina) or an aluminum nitride substrate made of aluminum nitride. Examples of the metal base substrate include an aluminum alloy substrate, an iron alloy substrate, and a copper alloy substrate.

  The LED 213b is an example of a light emitting element, and is a bare chip that emits monochromatic visible light. As the LED 213b, a far red LED, a blue LED, a yellow LED, a green LED, or the like is used. Each of the LEDs 213b is die-bonded to the substrate 213a by, for example, a die attach material (die bond material).

  As a configuration of the irradiation unit 213, for example, a far red light LED is provided as the LED 213b for irradiating far red light, and a blue LED, a green LED, and a red LED are provided as the LED 213b for irradiating mixed light. Good. Alternatively, the irradiation unit 213 includes a far red light LED as the LED 213b and a blue LED as the LED 213b to emit far red light, and emits mixed light by combining the blue LED and yellow phosphor particles. It is good also as a structure.

  These far-red LED, blue LED, yellow LED and green LED 213b are preferably arranged on the substrate 213a so that the same kind of LEDs 213b are not adjacent to each other. With this configuration, it is possible to reduce the color deviation due to the emission light emission location, and to obtain uniform irradiation light.

  The wiring 223 is a metal wiring made of tungsten (W) or copper (Cu). The wiring 223 is patterned in a predetermined shape for electrically connecting the LEDs 213b to each other and electrically connecting the LEDs 213b, the connector 224, and the connector 225.

  In FIG. 6, the wiring 223 connects the LEDs 213 b arranged in a line in series, but the configuration of the wiring 223 is not limited to this. For example, the wiring 223 may have a configuration in which LED element rows each including a predetermined number of LEDs 213b arranged in a row are connected in parallel.

  Further, the wiring 223 may be an LED element array in which LEDs 213b of the same type among far-red light LEDs, blue LEDs, and yellow LEDs and green LEDs are connected in series, and the LED element arrays are connected in parallel. preferable. With this configuration, the emission intensity of each type of LED 213b can be individually controlled, and can be adjusted to appropriate irradiation light from the viewpoint of maintaining the freshness of the crop 30 and visibility.

  Or the wiring 223 is good also as a structure which connects far red light LED which mainly contributes to the freshness maintenance of the crop 30, and another kind of LED in parallel. With this configuration, it is possible to adjust the intensity and irradiation time of far-red light that mainly contributes to maintaining the freshness of the crop 30, and it is possible to more appropriately maintain the freshness of the crop 30.

  The connectors 224 and 225 are connectors for supplying power to the light emitting module 213c. DC power is supplied from the controller 212 to the connector 224 or the connector 225. Thereby, the light emitting module 213c emits light.

[Effects]
Here, the main points of the display device 200 according to Embodiment 2 will be described again.

  The display device 200 according to the second embodiment includes a freshness maintaining device 210 and a shelf 202 on which the crop 30 is displayed.

If the display device 200 having the above configuration is used, the crop 30 after harvesting is displayed,
The freshness of the crop 30 can be appropriately maintained, and the visibility of the crop 30 can be improved.

(Supplement of the embodiment)
First, supplementary information on crops. In the above embodiment, “agricultural crops” refers to all crops that can be harvested by agricultural techniques. The agricultural product is not particularly limited, but the agricultural product includes, for example, vegetables, fruits, or flowers in a classification (called a horticultural classification or an artificial classification) according to a normal use site.

  Examples of vegetables include fruit vegetables, leaf stems, root vegetables, and fungi.

  Here, fruit vegetables include eggplant, pepino, tomato, cherry tomato, tamariro, Takanotsume, pepper, pepper shrimp, habanero, peppers, paprika, colored peppers, pumpkin, zucchini, cucumber, tsutonigauri, shirori, bitter gourd, tougan, chayote , Grain, corn, azuki beans, kidney beans, peas, green beans, cowpeas, winged bean, broad beans, soybeans, farm beans, peanuts, lentils, sesame seeds, etc. Beans are included.

  In addition, the leaf stems include ice plant, ashitaba, mustard, cabbage, watercress, kale, komatsuna, salad na, sunny lettuce, saishin, sanchu, santo vegetables, perilla, sangiku, junsai, silona, seri, celery, taasai, daikonna ( (Suzushiro), Takana, Chisha, Chingensai, Tsukena, Rape, Nozawana, Chinese cabbage, Parsley, Haruna, Chard, Spinach, Hotokenoza, Mizuna, Midorihakobe, Kochakobe, Ushihakobe, Mitsuna, Mitsuba, Mekabetsu, Morohaya, Rifletas, Ruco , Leaf vegetables such as wasabi, leek, fine leek, chives, leek, asparagus, udo, kohlrabi, zai, bamboo shoot, garlic, rhinoceros, leek, leek, onion and other stem vegetables, artichoke, broccoli, cauliflower, Use chrysanthemum, a Do it, Fukinoto, flower vegetables such as Zingiber mioga, sprouts, bean sprouts, include germination vegetables such as radish sprouts.

  Root vegetables include turnips, Japanese radish, Japanese radish, horseradish, horseradish, burdock, chorogi, ginger, carrot, rakkyo, lotus root, lily root, sweet potato, taro, potato, Japanese yam, and yam. Potatoes such as (mountain mushrooms, natural moths) are included.

  Also, the fungi include enokitake, eringi, jellyfish, kinusatake, shiitake, shimeji, white jellyfish, tamogitake, shichitake, nameko, aratake, bamboo shoot, oyster mushroom, bunshimeji, bunapi, porcini, hon shimeki Yamabushitake, shoro and truffles are included.

  In addition, fruits include, for example, various citrus fruits such as mandarin oranges, apples, peaches, pears, pears, bananas, grapes, cherries, gummy, raspberries, blueberries, raspberries, blackberries, mulberry, loquat, figs, oysters, akebi, Mango, avocado, jujube, pomegranate, passion fruit, pineapple, banana, papaya, apricot, ume, plum, peach, kiwifruit, karin, bayberry, chestnut, miracle fruit, guava, star fruit, acerola and so on.

In addition, for example, horihok, bouvargia, godetia, camellia, stock, ha button, lunaria, acidansera, iris, gladiolus, chanterelle, peperomia, calceolaria, snapdragon, torenia, primrose, cyclamen, pine bark, anthurium, color, , Shabu, Cingonium, Spasifilm, Dieffenbachia, Philodendron, Cactus, Ajuga, Kaktranoo, Salvia, Begonia, Curcuma, Water Lily, Portulaca, Violet, White Traced Flower, Setocreacea, Murasakikimoto, Murasakitsuyuusa, Hosenka, Tsunos, Petunia, physalis, carnations, radish, redwood, gypsophila, perennial gypsophila, citrus radish, guzumania, snow Lerici, Shibazakura, Phlox, Euphorbia, Kyokanoko, Amakurinam, Amaryllis, Chrysanthemum, Margaret, Kunlan, Kirtansus, Daffodil, Snowflake, Tamasdale, Nerine, Hamamoto, Eucharis, Licorice, Agave, Kate, Borneo Kalanchoe, Scabiosa, Sweet pea, Lupine, Lurisio, Forget-me-not, Astilbe, Yukinoshita, Agapanthus, Amadokororo, Aloe, Ornithogalum, Omoto, Oryzullan, Giboshi, Black lily, Gloriosa, Corticum, Sansevieria, Thundersonia, Snail Dracaena, Triteria, Narco Yuri, New Sairan, Baimo, Here , Phototogis, Yabukanzo, Yabulan, Lily, Alstroemeria, Ruscus, Cyprinus, Ebine, Oncidium, Cattleya, Colmanara, Silane, Cymbidium, Selodyne, Dendribium, Doritenopsis, Nagolan, Paphiopedilum, Vanda, Echinacea Eustoma grandiflorum, gentian, lantana, rose, cherry, gerbera, etc. are listed, as well as oysters, cycad, fern, dracaena, halans, monstera, potos, compactors, polycious, jungle bush, licorice, beargrass used to appreciate the leaves , Pitosporum, etc.

  As mentioned above, although some agricultural products were illustrated, the freshness maintenance method of the said embodiment is applicable also to agricultural products other than the illustrated agricultural products.

  Next, it supplements about freshness maintenance. In the above embodiment, “keeping freshness” means keeping the freshness of agricultural products as long as possible. The freshness-keeping effect required for a crop varies depending on the type of crop, the commercial value, and the like.

  For example, in vegetables (leafy vegetables) in which leaves or stems such as lettuce and spinach are mainly used, prevention of wilting (suppression of a decrease in water retention), discoloration (yellowing, browning, etc.), prevention of softening, In addition, prevention of mold generation is important. In addition, it is important to prevent discoloration (yellowing, browning, etc.), softening, and prevention of mold generation in vegetables (fruit vegetables) that mainly use fruits such as strawberries and tomatoes, or fruit trees such as apples. Become. Furthermore, in flowering plants, it is important to prevent wilting (suppression of a decrease in water retention), to prevent discoloration (yellowing, browning, etc.) and to prevent mold generation.

  Next, the usage scene of the freshness keeping method of the above embodiment will be supplemented. In the above embodiment, the freshness maintaining method is used in the scene where the crop is stored in the store's backyard or the crop is displayed in the store's sales floor, but the freshness maintaining method is used in other scenes. May be used.

  The harvested crop is transported to the city by a cold truck through a farm, an agricultural cooperative, a dedicated facility for pre-cooling the crop, for example. The harvested crops are purchased by wholesalers in the market, stored in a backyard such as a supermarket, and displayed on the sales floor.

  In the above route, a freshness maintaining method can be used in a dedicated facility, a cold car, a backyard such as a supermarket, and a sales floor.

In addition, the harvested crops are transported to the second delivery office by a delivery vehicle after passing through, for example, a farmhouse and the first delivery office. Thereafter, the harvested crop may be transported to the purchaser's house (personal house) by a delivery vehicle.

  In the above route, the freshness maintaining method can be used in the first delivery business office, the delivery car, the cold truck, the second delivery business office, and the like.

  Further, for example, the freshness maintaining method of the above-described embodiment may be used for a crop before harvesting instead of a crop after harvesting.

  The far-red light is transmitted through a general material (for example, polyethylene) used as a storage container for agricultural products. For this reason, the freshness keeping method of the above-described embodiment can be used for a boxed normal crop or a bagged crop.

  In addition, since far-red light may also pass through farm products, the freshness maintaining method of the above embodiment can be used for crops stacked with other crops.

  Moreover, the freshness maintenance method of the said embodiment may be used in a completely dark environment (darkness), and may be used in the environment artificially illuminated by white LED etc. Moreover, the freshness maintenance method of the said embodiment may be used under sunlight.

  In addition, the crop after being irradiated with far-red light may be stored in a completely dark environment (darkness), or may be stored in an environment artificially illuminated by a white LED or the like, or sunlight. May be stored under.

(Other embodiments)
As described above, the freshness holding method, the freshness holding device, the storage, and the display device according to the present invention have been described using the first and second embodiments. However, the present invention is a freshness holding method according to the first and second embodiments. However, the present invention is not limited to the freshness holding device, the storage, and the display device.

  For example, Embodiments 1 and 2 have been described using an LED as a light source, but the light-emitting element is not limited to an LED. For example, a fluorescent tube, a metal halide lamp, a sodium lamp, a halogen lamp, a xenon lamp, a neon tube, inorganic electroluminescence, organic electroluminescence, chemiluminescence (chemiluminescence), or a laser may be used as the light source.

  When using a light source that emits light in a wavelength range other than the necessary wavelength range, such as a fluorescent tube, it can be used as light having only the required wavelength range by combining with a spectral filter or the like. .

  Moreover, the irradiation mode of far-red light is not particularly limited. For example, a very large amount of light such as a strobe light may be instantaneously irradiated with far-red light. Or you may irradiate far red light with a low light quantity for a long time. Or you may continue irradiating far red light continuously, or you may irradiate far red light intermittently.

  Moreover, the freshness holding device, storage, or display device according to the present invention may include an illuminance sensor. By using the illuminance sensor, the freshness maintaining device, storage, and display device according to the present invention can adjust the irradiation illuminance of far-red light and mixed light according to the surrounding environment and the like.

In the above-described embodiment, all or a part of each component (for example, a controller) may be configured by dedicated hardware, or realized by executing a software program suitable for each component. May be. Each component is a CPU (Centra
(1 Processing Unit) or a processor such as a processor may read out and execute a software program stored in a storage medium such as a hard disk or a semiconductor memory.

  In addition, about each above-mentioned embodiment, it is only an illustration of the embodiment of this invention, and it is only an illustration of what is preferable also about a numerical value, a raw material, a shape, a component, an operation | movement, etc., and this invention is these embodiment. It is not limited to only. In addition, among the constituent elements in the above-described embodiment, constituent elements that are not described in the independent claims indicating the highest concept are arbitrary constituent elements. The configuration can be appropriately changed without departing from the scope of the technical idea of the present invention.

  Hereinafter, the present embodiment will be described in more detail with reference to examples and comparative examples.

  In the following description, “the number of peaks 3” means having one peak in a wavelength range of 400 nm to 480 nm, a wavelength range of 500 nm to 650 nm, and a wavelength range of 700 nm to 750 nm. However, in the following tables, when there is no numerical description for the far-red light wavelength, the “number of peaks 3” is one in the wavelength range of 400 nm to 480 nm and 500 nm to 650 nm. It means having a peak.

  In addition, “number of peaks 4” means that one peak is present in each of a wavelength range of 400 nm to 480 nm, a wavelength range of 500 nm to 550 nm, a wavelength range of 600 nm to less than 700 nm, and a wavelength range of 700 nm to 750 nm. It means having. However, in the following tables, when there is no numerical description for the far red light wavelength, “peak number 4” means a wavelength range of 400 nm to 480 nm, a wavelength range of 500 nm to 550 nm, and a wavelength range of 600 nm to less than 700 nm Having one peak in the wavelength range.

  The “peak ratio” is a value of (P2 / P1) × 100, where P1 is a peak intensity in a wavelength range of 400 nm to 480 nm and P2 is a peak intensity in a wavelength range of 700 nm to 750 nm. is there.

  The “irradiation time” refers to the time during which the crop is irradiated with light having a peak wavelength in the wavelength range of 700 nm or more and 750 nm or less in one irradiation.

  The “number of times of irradiation” is the number of times of irradiation with light having a peak wavelength in a wavelength range of 700 nm or more and 750 nm or less.

  In addition, the “interval time” refers to a period from irradiation of light having a peak wavelength in a wavelength range of 700 nm to 750 nm to irradiation of light having a peak wavelength in a wavelength range of 700 nm to 750 nm. It's about time.

Further, the “light integrated amount” is an integrated amount per day of light in a wavelength range of 700 nm or more and 750 nm or less, and is a unit of J / m ² .

  The “color temperature” is the color temperature of the irradiation light irradiated on the crop in the experiment.

Further, in each of the following tables, “freshness maintenance” means that, under each condition, there is no irradiation of light in a wavelength range of 700 nm or more and 750 nm or less when the moisture content of the crop is 95% or less of the initial moisture content. It is a numerical value that represents how many times the time is. Here, the water content of the crop is calculated assuming that the amount of change from the initial value of the weight of the crop is the weight of the water evaporated from the crop.

  In addition, the result shown below is an average result of having performed the same experiment by 5 samples.

(Experiment 1)
In a thermostat, a bundle of spinach, which is a leaf-stem vegetable, is placed in a cubic test box with a side of 300 mm, and an experiment for maintaining freshness is performed. In all of the examples and comparative examples, the spinach is irradiated with light so as to be 2000 lx to 2500 lx. Further, the spinach is irradiated with far-red light once a day. The temperature in the temperature-controlled room is 5 degrees Celsius or 20 degrees Celsius, and the humidity in the temperature-controlled bath is 80% to 90%. Under the above conditions, the color temperature, the number of peaks, the peak ratio, the irradiation time, and the temperature parameters are set as numerical values of Examples 1 to 12 and Comparative Examples 1 to 8 shown in Table 1, and experiments are performed under the respective conditions.

［ピーク比率の影響について］
色温度６５００Ｋの実施例及び比較例において、ピーク比率の数値のみが異なる実施例１、２及び４と比較例２との鮮度保持の結果を、表２に示す。ここで、比較例１は７００ｎｍ以上７５０ｎｍ以下の波長範囲の光の照射が無い実験例であり、表２のそれぞれの鮮度保持の数値は、農作物の水分量が初期水分量の９５％以下になる時間が比較例１の何倍であるかを示す。

[Influence of peak ratio]
Table 2 shows the results of maintaining freshness in Examples 1, 2 and 4 and Comparative Example 2 that differ only in the numerical value of the peak ratio in Examples and Comparative Examples with a color temperature of 6500K. Here, Comparative Example 1 is an experimental example in which there is no irradiation with light in the wavelength range of 700 nm to 750 nm, and the freshness retention values in Table 2 indicate that the water content of the crop is 95% or less of the initial water content. It shows how many times the time is in Comparative Example 1.

表２に示す通り、ピーク比率が５％以上である実施例１、２及び４では、鮮度保持の値は、１．１倍以上である。一方で、ピーク比率が５％未満である比較例２では、鮮度保持の値は、１．０３であり、遠赤色光のピークを有さない比較例１と同程度にしか鮮度を保持できていない。故に、色温度６５００Ｋにおいては、７００ｎｍ以上７５０ｎｍ以下の波長範囲のピーク強度は、４００ｎｍ以上４８０ｎｍ以下の波長範囲のピーク強度の５％以上であることが好ましい。

As shown in Table 2, in Examples 1, 2, and 4 in which the peak ratio is 5% or more, the freshness retention value is 1.1 times or more. On the other hand, in Comparative Example 2 in which the peak ratio is less than 5%, the freshness retention value is 1.03, and the freshness can be retained only to the same extent as in Comparative Example 1 that does not have a peak of far-red light. Absent. Therefore, at a color temperature of 6500 K, the peak intensity in the wavelength range from 700 nm to 750 nm is preferably 5% or more of the peak intensity in the wavelength range from 400 nm to 480 nm.

  In addition, when the peak ratio is 80% as in Example 1, the freshness retention value is as high as 1.3, so the freshness retention method is executed with the upper limit of the peak ratio being 80%. May be. That is, when the color temperature is 6500 K, the peak intensity in the wavelength range from 700 nm to 750 nm is controlled to be 5% to 80% of the peak intensity in the wavelength range from 400 nm to 480 nm. May be. Of course, the freshness maintaining method can be executed under the condition that the peak ratio is 80% or more.

  Table 3 shows the results of maintaining freshness in Examples 5, 6 and 8 and Comparative Example 5 which differ only in the numerical value of the peak ratio in Examples and Comparative Examples having a color temperature of 5000K. Here, Comparative Example 4 is an experimental example in which there is no irradiation with light in the wavelength range of 700 nm or more and 750 nm or less, and the numerical values for maintaining freshness in Table 3 indicate that the water content of the crop is 95% or less of the initial water content. It shows how many times the time is in Comparative Example 4.

表３に示す通り、ピーク比率が８％以上である実施例５、６及び８では、鮮度保持の値は、１．１倍以上である。一方で、ピーク比率が８％未満である比較例５では、鮮度保持の値は、１．０３であり、遠赤色光のピークを有さない比較例５と同程度にしか鮮度を保持できていない。故に、色温度５０００Ｋにおいては、７００ｎｍ以上７５０ｎｍ以下の波長範囲のピーク強度は、４００ｎｍ以上４８０ｎｍ以下の波長範囲のピーク強度の８％以上であることが好ましい。

As shown in Table 3, in Examples 5, 6 and 8 in which the peak ratio is 8% or more, the freshness retention value is 1.1 times or more. On the other hand, in Comparative Example 5 where the peak ratio is less than 8%, the value of the freshness retention is 1.03, and the freshness can be retained only to the same extent as in Comparative Example 5 that does not have a peak of far-red light. Absent. Therefore, at a color temperature of 5000 K, the peak intensity in the wavelength range from 700 nm to 750 nm is preferably 8% or more of the peak intensity in the wavelength range from 400 nm to 480 nm.

In addition, when the peak ratio is 50% as in Example 5, the freshness retention value is as high as 1.3, so the freshness retention method is executed with the upper limit of the peak ratio being 50%. May be. That is, at a color temperature of 5000 K, the peak intensity in the wavelength range from 700 nm to 750 nm is 8% to 50% of the peak intensity in the wavelength range from 400 nm to 480 nm.
The freshness maintaining method may be executed with control to be equal to or less than%. Of course, the freshness maintaining method can be executed under the condition that the peak rate is 50% or more.

  Table 4 shows the results of maintaining freshness in Examples 9, 10 and 11 and Comparative Example 8 which differ only in the numerical value of the peak ratio in Examples and Comparative Examples with a color temperature of 3500K. Here, Comparative Example 7 is an experimental example in which there is no irradiation with light in the wavelength range of 700 nm to 750 nm, and each of the freshness retention values in Table 4 indicates that the water content of the crop is 95% or less of the initial water content. It shows how many times the time is in Comparative Example 7.

表４に示す通り、ピーク比率が１０％以上である実施例９、１０及び１１では、鮮度保持の値は、１．１倍以上である。一方で、ピーク比率が１０％未満である比較例８では、鮮度保持の値は、１．０３であり、遠赤色光のピークを有さない比較例７と同程度にしか鮮度を保持できていない。故に、色温度３５００Ｋにおいては、７００ｎｍ以上７５０ｎｍ以下の波長範囲のピーク強度は、４００ｎｍ以上４８０ｎｍ以下の波長範囲のピーク強度の１０％以上であることが好ましい。

As shown in Table 4, in Examples 9, 10 and 11 in which the peak ratio is 10% or more, the freshness retention value is 1.1 times or more. On the other hand, in Comparative Example 8 where the peak ratio is less than 10%, the value of the freshness retention is 1.03, and the freshness can be retained only to the same extent as in Comparative Example 7 that does not have the peak of far-red light. Absent. Therefore, at a color temperature of 3500 K, the peak intensity in the wavelength range from 700 nm to 750 nm is preferably 10% or more of the peak intensity in the wavelength range from 400 nm to 480 nm.

  Further, when the peak ratio is 30% as in Example 9, the freshness retention value is as high as 1.3, so the freshness retention method is executed with the upper limit of the peak ratio being 40%. May be. That is, when the color temperature is 3500 K, the peak intensity in the wavelength range from 700 nm to 750 nm is controlled to be 10% to 40% of the peak intensity in the wavelength range from 400 nm to 480 nm. May be. Of course, the freshness maintaining method can be executed under the condition that the peak ratio is 40% or more.

[Influence of irradiation time]
Table 5 shows the results of maintaining freshness in Examples 5 and 7 and Comparative Example 6 that differ only in the numerical value of irradiation time. Here, Comparative Example 4 is an experimental example in which there is no irradiation with light in a wavelength range of 700 nm or more and 750 nm or less, and the respective freshness retention values in Table 5 indicate that the water content of the crop is 95% or less of the initial water content. It shows how many times the time is in Comparative Example 4.

表５に示す通り、照射時間が５分以上である実施例５及び６では、鮮度保持の値は、１
．１倍以上である。一方で、照射時間が５分未満である比較例６では、鮮度保持の値は１．０３であり、遠赤色光のピークを有さない比較例４と同程度にしか鮮度を保持できていない。故に、７００ｎｍ以上７５０ｎｍ以下の波長範囲の光を、１日に５分以上照射することが好ましい。

As shown in Table 5, in Examples 5 and 6 in which the irradiation time is 5 minutes or more, the freshness retention value is 1
. 1 or more times. On the other hand, in Comparative Example 6 in which the irradiation time is less than 5 minutes, the freshness retention value is 1.03, and the freshness can be retained only to the same extent as in Comparative Example 4 that does not have a far-red light peak. . Therefore, it is preferable to irradiate light having a wavelength range of 700 nm or more and 750 nm or less for 5 minutes or more per day.

[Influence of temperature]
Table 6 shows the results of maintaining freshness of Examples 5 and 12 that differ only in the numerical value of temperature. Here, Comparative Example 4 is an experimental example in which there is no irradiation with light in a wavelength range of 700 nm or more and 750 nm or less, and the respective freshness retention values in Table 5 indicate that the water content of the crop is 95% or less of the initial water content. It shows how many times the time is in Comparative Example 4. Moreover, temperature is the temperature of a thermostat.

表６に示す通り、温度が摂氏５度の実施例５と、温度が摂氏２０度である実施例１２とは、それぞれ鮮度保持の値が１．３と１．２８であり、ほぼ同程度に農作物の鮮度を保持できる。故に、本発明に係る鮮度保持方法は、冷却設備がある場所（５度）及び常温の場所（２０度）のどちらでも使用することができる。

As shown in Table 6, Example 5 with a temperature of 5 degrees Celsius and Example 12 with a temperature of 20 degrees Celsius have freshness retention values of 1.3 and 1.28, respectively, which are approximately the same. Can maintain the freshness of crops. Therefore, the freshness keeping method according to the present invention can be used in either a place where the cooling facility is located (5 degrees) or a place where the room temperature is normal (20 degrees).

[Influence of peak number]
Table 7 shows the results of maintaining freshness of Examples 1 and 3 that differ only in the number of peaks. Here, Comparative Example 1 is an experimental example in which light having a wavelength range of 700 nm or more and 750 nm or less of Example 1 is not irradiated, and the numerical value for maintaining freshness in Example 1 in Table 7 indicates that the water content of the crop is the initial water content. It shows how many times of Comparative Example 1 the time to become 95% or less. Here, Comparative Example 3 is an experimental example without irradiation of light in the wavelength range of 700 nm or more and 750 nm or less of Example 3, and the numerical value of maintaining freshness of Example 3 in Table 7 indicates that the water content of the crop is the initial water content. It shows how many times of Comparative Example 3 the time to become 95% or less.

表７に示す通り、ピーク数３である実施例１とピーク数４である実施例３とは、それぞれ鮮度保持の値が１．３と１．３３であり、ほぼ同程度に農作物の鮮度を保持できる。一方、赤色の範囲にピーク数が多い実施例３の方が、実施例１と比べて赤みが綺麗に見え、農作物の視認性の観点では優れている。

As shown in Table 7, Example 1 with a peak number of 3 and Example 3 with a peak number of 4 have freshness retention values of 1.3 and 1.33, respectively. Can hold. On the other hand, Example 3, which has a larger number of peaks in the red range, looks more reddish than Example 1, and is superior in terms of visibility of crops.

(Experiment 2)
In a thermostat, a bundle of spinach, which is a leaf-stem vegetable, is placed in a cubic test box with a side of 300 mm, and an experiment for maintaining freshness is performed. In all of the examples and comparative examples, the spinach is irradiated with light so as to be 2000 lx to 2500 lx. Further, the spinach is irradiated with light once a day. The temperature in the temperature-controlled room is 5 degrees Celsius, and the humidity in the temperature-controlled bath is 80% to 90%. The numerical values of the number of peaks are 3, the peak ratio is 8%, the far-red light wavelength is 735 nm, the color temperature is 6500K, and the parameters of the integrated light amount are shown in Table 8, Examples 13 and 14 and Comparative Example 9 The experiment is carried out under each condition.

  In addition, as Comparative Example 10, the experiment is also performed under the condition where there is no irradiation of light in the wavelength range of 700 nm to 750 nm. Table 8 also shows the results of maintaining freshness under each condition. Since Comparative Example 10 is an experimental example in which there is no irradiation with light in the wavelength range of 700 nm to 750 nm, the respective freshness retention values in Table 8 indicate the time during which the moisture content of the crop is 95% or less of the initial moisture content. It shows how many times it is in Comparative Example 10.

［光積算量の影響について］
表８に示す通り、光積算量が３０Ｊ／ｍ^２以上である実施例１３及び１４では、鮮度保持の値は、１．１倍以上である。一方で、光積算光量が３０Ｊ／ｍ^２未満である比較例９では、鮮度保持の値は、１．０１であり、遠赤色光のピークを有さない比較例１０と同程度にしか鮮度を保持できていない。故に、１日あたりの光積算量は、３０Ｊ／ｍ^２以上であることが好ましい。

[Influence of light integration amount]
As shown in Table 8, in Examples 13 and 14 in which the integrated light amount is 30 J / m ² or more, the freshness retention value is 1.1 times or more. On the other hand, in Comparative Example 9 in which the light integrated light quantity is less than 30 J / m ² , the freshness retention value is 1.01, and the freshness is only as high as in Comparative Example 10 that does not have a peak of far-red light. I can't hold it. Therefore, the integrated light amount per day is preferably 30 J / m ² or more.

(Experiment 3)
In a thermostat, a bundle of spinach, which is a leaf-stem vegetable, is placed in a cubic test box with a side of 300 mm, and an experiment for maintaining freshness is performed. In all of the examples and comparative examples, the spinach is irradiated with light so as to be 2000 lx to 2500 lx. The temperature in the temperature-controlled room is 5 degrees Celsius, and the humidity in the temperature-controlled bath is 80% to 90%. Comparison with Example 15 in which the number of peaks is 4, the peak ratio is 120%, the far red light wavelength is 735 nm, the irradiation time is 60 minutes, the color temperature is 3500 K, the interval time is 180 minutes, and the number of irradiations is shown in Table 9 Each experiment is performed with the values of Example 11.

  In addition, as Comparative Example 12, the experiment is also performed under the condition where there is no irradiation with light having a wavelength range of 700 nm to 750 nm. Table 9 also shows the results of maintaining freshness under each condition. Since Comparative Example 12 is an experimental example in which there is no light irradiation in the wavelength range of 700 nm to 750 nm, the respective freshness retention values in Table 9 indicate the time during which the water content of the crop is 95% or less of the initial water content. It shows how many times as compared with Comparative Example 12.

［照射回数の影響について］
表９に示す通り、照射回数４回の実施例１５の鮮度保持の値１．４２であり、照射回数１回の比較例１１の鮮度保持の値１．０６よりも、鮮度保持の値が大きい。つまり、７００ｎｍ以上７５０ｎｍ以下の波長範囲の光は、複数回照射することが好ましい。

[Influence of the number of irradiations]
As shown in Table 9, the freshness retention value of Example 15 with four irradiations was 1.42, and the freshness retention value was larger than the freshness retention value 1.06 of Comparative Example 11 with one irradiation. . That is, it is preferable to irradiate light having a wavelength range of 700 nm to 750 nm multiple times.

(Experiment 4)
In a thermostat, a bundle of spinach, which is a leaf-stem vegetable, is placed in a cubic test box with a side of 300 mm, and an experiment for maintaining freshness is performed. In all of the examples and comparative examples, the spinach is irradiated with light so as to be 2000 lx to 2500 lx. The temperature in the temperature-controlled room is 5 degrees Celsius, and the humidity in the temperature-controlled bath is 80% to 90%. The number of peaks is 3, the peak ratio is 120%, the far red light wavelength is 735 nm, the irradiation time is 60 minutes, the color temperature is 3500 K, and the interval times are shown in Table 10, Examples 16, 17, 18 and Comparative Example 13 Each experiment is performed with the numerical value of.

  Further, as Comparative Example 14, the experiment is also performed under the condition where there is no irradiation of light in the wavelength range of 700 nm to 750 nm. Table 10 also shows the results of maintaining freshness under each condition. Since Comparative Example 14 is an experimental example in which there is no light irradiation in the wavelength range of 700 nm or more and 750 nm or less, the respective freshness retention values in Table 10 indicate the time during which the moisture content of the crop is 95% or less of the initial moisture content. It shows how many times it is in Comparative Example 14.

［インターバル時間の影響について］
表１０に示す通り、インターバル時間が照射時間（６０分）より長い実施例１６、１７及び１８では、鮮度保持の値がおおよそ１．１以上である。一方で、インターバル時間が照射時間より短い比較例１３では、鮮度保持の値は１．０２であり、遠赤色光のピークを有さない比較例１４と同程度にしか鮮度を保持できていない。故に、インターバル時間は、照射時間より長いことが好ましい。

[Influence of interval time]
As shown in Table 10, in Examples 16, 17, and 18 in which the interval time is longer than the irradiation time (60 minutes), the freshness retention value is approximately 1.1 or more. On the other hand, in Comparative Example 13 in which the interval time is shorter than the irradiation time, the freshness retention value is 1.02, and the freshness can be retained only to the same extent as in Comparative Example 14 that does not have the peak of far red light. Therefore, the interval time is preferably longer than the irradiation time.

(Experiment 5)
In a thermostat, a bundle of spinach, which is a leaf-stem vegetable, is placed in a cubic test box with a side of 300 mm, and an experiment for maintaining freshness is performed. In all of the examples and comparative examples, the spinach is irradiated with light so as to be 2000 lx to 2500 lx. The temperature in the temperature-controlled room is 5 degrees Celsius, and the humidity in the temperature-controlled bath is 80% to 90%. The experiment is performed with the numerical values of Examples 19, 20, and 21 shown in Table 11 with the number of peaks being 3, the color temperature being 5000 K, and the irradiation of far-red light once a day.

  Table 11 also shows the results of the freshness retention under each condition. In addition, since Comparative Example 4 is an experimental example in which there is no irradiation with light in the wavelength range of 700 nm or more and 750 nm or less, each of the freshness retention values in Table 11 indicates that the water content of the crop is 95% or less of the initial water content. It shows how many times the time is in Comparative Example 4.

表１１に示す通り、遠赤色光波長が７２０ｎｍ、７３５ｎｍ、７４０ｎｍのそれぞれの波長において、鮮度保持の値は１．１以上である。故に、７００ｎｍ以上７５０ｎｍ以下の波長範囲の光を照射であれば、農作物の鮮度をより長く保持することができる。

As shown in Table 11, the freshness retention value is 1.1 or more at the far-red light wavelengths of 720 nm, 735 nm, and 740 nm. Therefore, if it irradiates light with a wavelength range of 700 nm or more and 750 nm or less, the freshness of the crop can be kept longer.

(Experiment 6)
In a thermostat, a bundle of spinach, which is a leaf-stem vegetable, is placed in a cubic test box with a side of 300 mm, and an experiment for maintaining freshness is performed. In all of the examples and comparative examples, the spinach is irradiated with light so as to be 2000 lx to 2500 lx. The temperature in the temperature-controlled room is 5 degrees Celsius, and the humidity in the temperature-controlled bath is 80% to 90%. The number of peaks was 3, the peak ratio was 120, the far-red light wavelength was 735 nm, the irradiation time was 60 minutes, and the interval time was 480 minutes. The irradiation sites were tested under the conditions of Examples 22 and 23 in Table 12, respectively. Do. In addition, the experiment is performed by providing a screen for shielding the irradiation light between the leaf part and the stem part of the spinach.

  Table 12 also shows the results of maintaining freshness under each condition. In addition, since Comparative Example 1 is an experimental example in which there is no irradiation with light in the wavelength range of 700 nm to 750 nm, the respective freshness retention values in Table 12 indicate that the water content of the crop is 95% or less of the initial water content. It shows how many times the time is in Comparative Example 1.

表１２に示す通り、実施例２２及び２３とは、鮮度保持の値が、１．１倍以上であり、ともに良好な鮮度保持の効果を示した。つまり、葉部又は茎部のどちらに遠赤色光を照射した場合でも、鮮度保持の効果を得ることができる。

As shown in Table 12, in Examples 22 and 23, the value of freshness retention was 1.1 times or more, and both showed good freshness retention effects. That is, the effect of maintaining freshness can be obtained regardless of whether the leaf portion or the stem portion is irradiated with far-red light.

  Here, the freshness retention value 1.38 of Example 22 in which the leaf portion was irradiated with irradiation light was larger than the freshness retention value 1.1 of Example 23 in which the stem portion was irradiated with irradiation light. That is, a better freshness maintaining effect can be obtained when far-red light is irradiated to a leaf portion having more pores.

(Experiment 7)
In a thermostatic bath, a broccoli strain that is a leaf stem vegetable or a peach that is a fruit is put in a cubic experiment box with a side of 300 mm, and an experiment for maintaining freshness is performed. In all of the examples and comparative examples, light irradiation is performed so as to be 2000 lx to 2500 lx. The temperature in the temperature-controlled room is 5 degrees Celsius, and the humidity in the temperature-controlled bath is 80% to 90%. The number of peaks was 3, the peak ratio was 80, the far-red light wavelength was 735 nm, the irradiation time was 60 minutes, the interval time was 420 minutes, and the color temperature was 5000 K. Examples 24 and 25 shown in Table 13 and Comparative Example 15 The experiment was conducted under the conditions of 16 and 16.

  Comparative Examples 15 and 16 are experimental examples without irradiation of light in the wavelength range of 700 nm to 750 nm in Examples 24 and 25, respectively. Therefore, the numerical values of freshness preservation in Examples 24 and 25 in Table 13 indicate how many times the comparative examples 15 and 16 are times when the water content of the crop is 95% or less of the initial water content.

表１３に示す通り、実施例２４及び２５では、鮮度保持の値が、それぞれ１．２３及び１．１１であり、良好な鮮度保持効果を示している。また、外観変化においては、遠赤色光を照射しなかった場合、モモでは表面にしわが発生し、ブロッコリーでは花雷が離れるという変化が生じた。一方で、遠赤色光を照射した場合は、モモとブロッコリーとのどちらにおいても、外観において著しい変化は見られなかった。このように、本発明に係る鮮度保持方法は、さまざまな農作物に適用可能である。

As shown in Table 13, in Examples 24 and 25, the freshness retention values were 1.23 and 1.11, respectively, indicating a good freshness retention effect. Moreover, in the appearance change, when far-red light was not irradiated, wrinkles were generated on the surface of peaches, and torpedoes were separated from broccoli. On the other hand, when far-red light was irradiated, no significant change in appearance was observed in either peach or broccoli. As described above, the freshness maintaining method according to the present invention is applicable to various agricultural products.

  As described above, the contents of the present embodiment have been described according to the examples, but the present embodiment is not limited to these descriptions, and various modifications and improvements can be made by those skilled in the art. It is self-explanatory.

10, 210 Freshness maintenance device 20 Case 30 Farm crop 100 Storage 200 Display device 202 Shelf

Claims (13)

A method for maintaining freshness by irradiating irradiated crops with irradiation light,
The irradiation light has a first peak wavelength in a wavelength range from 400 nm to 480 nm, a second peak wavelength in a wavelength range from 500 nm to 650 nm, and a third peak wavelength in a wavelength range from 700 nm to 750 nm,
The freshness maintaining method, wherein the intensity of the third peak wavelength of the irradiation light is 5% or more of the intensity of the first peak wavelength of the irradiation light. The second peak wavelength exists in a wavelength range of 500 nm or more and 550 nm or less,
The freshness maintaining method according to claim 1, wherein the irradiation light further has a fourth peak wavelength in a wavelength range of 600 nm or more and less than 700 nm.   The freshness maintaining method according to claim 1 or 2, wherein the irradiation light has a color temperature of 5600K to 7000K. The irradiation light has a color temperature of 4000K or more and less than 5600K,
The freshness maintaining method according to claim 1 or 2, wherein the intensity of the third peak wavelength of the irradiation light is 8% or more of the intensity of the first peak wavelength of the irradiation light. The irradiation light has a color temperature of 2000K or more and less than 4000K,
The freshness maintaining method according to claim 1 or 2, wherein the intensity of the third peak wavelength of the irradiation light is 10% or more of the intensity of the first peak wavelength of the irradiation light.   The freshness keeping method according to any one of claims 1 to 5, wherein the irradiation light is irradiated with light having the third peak wavelength for 5 minutes or more per day.   The freshness maintaining method according to any one of claims 1 to 6, wherein the irradiation light is repeatedly irradiated with light having the third peak wavelength a plurality of times.   The freshness maintaining method according to claim 7, wherein, in the irradiation light, an irradiation interval time of the light having the third peak wavelength is longer than an irradiation time of the light having the third peak wavelength. The freshness keeping method according to any one of claims 1 to 8, wherein an integrated light amount of the irradiation light in a range of 700 nm to 750 nm is 30 J / m ² or more per day. A freshness maintaining device for irradiating irradiated crops with irradiation light,
Irradiation unit for irradiating irradiation light having a first peak wavelength in a wavelength range of 400 nm to 480 nm, a second peak wavelength in a wavelength range of 500 nm to 650 nm, and a third peak wavelength in a wavelength range of 700 nm to 750 nm With
The freshness holding device, wherein the intensity of the third peak wavelength of the irradiation light is 5% or more of the intensity of the first peak wavelength of the irradiation light. The second peak wavelength exists in a wavelength range of 500 nm or more and 550 nm or less,
The freshness maintaining apparatus according to claim 10, wherein the irradiation light further has a fourth peak wavelength in a wavelength range of 600 nm or more and less than 700 nm. A freshness holding device according to claim 10 or 11,
A storage, comprising a housing for storing the crop. A freshness holding device according to claim 10 or 11,
A display device comprising: a shelf on which the crop is displayed.

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