TWI660676B - refrigerator - Google Patents

Abstract

Provided is a refrigerator that can efficiently use light radiation energy without consuming excess energy, and can promote photosynthesis of vegetables and fruits (especially leafy vegetables) during storage. Therefore, the refrigerator includes a storage room for storing food, and a light emitting section (14) capable of radiating visible light inside the storage room. The light emitting section (14) includes a first light source (16a) that irradiates light with a first wavelength in the visible range as a center wavelength, and a second light source (16b) that irradiates a wavelength in the visible range shorter than the first wavelength. The second wavelength is the light of the center wavelength. The light emitting unit (14) irradiates light from the first light source (16a) at a first radiation intensity in the irradiation procedure of the irradiation light, and simultaneously emits light from the second light source (16b) at a second radiation intensity different from the first radiation intensity. Shine light.

Description

refrigerator

The present invention relates to a refrigerator.

In the conventional refrigerators, the following refrigerators are known (for example, refer to Patent Document 1): A plurality of reds are provided in a vegetable room of the refrigerator. blue. The irradiating plate of the light emitting diode element of three colors of green is divided into a plurality of regions, and a selection means is provided for changing the combination of the light emitting colors of the light emitting diode elements irradiating each region.

Advance technical literature Patent literature

Patent Document 1: Japanese Patent Application Laid-Open No. 2005-065622

However, the conventional refrigerator shown in Patent Document 1 does not consider red in photosynthesis of plants. blue. Light of each color of green, that is, characteristics of each wavelength of light. Therefore, in order to cause certain photosynthesis, it is necessary to irradiate more light than necessary light radiation energy, so that a part of the light radiation energy is converted into heat, causing unnecessary energy consumption.

In order to solve the above-mentioned problem, the present invention is to obtain a refrigerator that can efficiently use light radiation energy without consuming excess energy, and can promote Photosynthesis of vegetables and fruits (especially leafy vegetables) during storage.

The refrigerator of the present invention includes: a storage room for storing food; and a light-emitting part capable of irradiating visible light inside the storage room; the pre-light-emitting part includes a first light source that irradiates a light having a first wavelength in a visible light range as a center wavelength Light; a second light source that irradiates light with a second wavelength that is shorter than the first wavelength in the visible range as the center wavelength; in the irradiation light irradiation procedure, the first light source irradiates light with the first radiation intensity in the previous description At the same time, the second light source from the preamble irradiates light with a second radiation intensity different from the first radiation intensity from the preamble.

The refrigerator of the present invention exhibits the effects described below: it can efficiently use light radiation energy without consuming excess energy, and can promote photosynthesis of vegetables and fruits (especially leafy vegetables) during storage.

1‧‧‧ refrigerator

2‧‧‧compressor

3‧‧‧ cooler

4‧‧‧Air supply fan

5‧‧‧ wind road

6‧‧‧ operation panel

7‧‧‧Refrigerator door

7a‧‧‧Right door

7b‧‧‧Left door

8‧‧‧Control device

8a‧‧‧Processor (CPU)

8b‧‧‧Memory

9‧‧‧ Vegetable Room Door

10‧‧‧ Lower storage box

11‧‧‧Upper storage box

12‧‧‧Door opening and closing detection switch

13‧‧‧Thermistor

14‧‧‧Lighting Department

15‧‧‧ opening

16a‧‧‧The first light source

16b‧‧‧Second light source

16c‧‧‧3rd light source

90‧‧‧ Insulated Box

100‧‧‧ Refrigerator

200‧‧‧ Switch Room

300‧‧‧ Ice Making Room

400‧‧‧freezer

500‧‧‧ Vegetable Room

201‧‧‧ Switching room storage box

401‧‧‧Freezer storage box

Fig. 1 is a front view of a refrigerator according to a first embodiment of the present invention.

Fig. 2 is a longitudinal sectional view of the refrigerator according to the first embodiment of the present invention.

FIG. 3 is an enlarged view of a vegetable compartment portion of FIG. 2.

Fig. 4 is a diagram showing a configuration of a light-emitting section provided in the refrigerator according to the first embodiment of the present invention.

Fig. 5 is a block diagram showing a configuration of a control system of a refrigerator according to a first embodiment of the present invention.

FIG. 6 is a time chart of light irradiation control of each light source provided in the light emitting section of the refrigerator in Embodiment 1 of the present invention.

Fig. 7 is a flowchart showing a light irradiation control flow of the refrigerator according to the first embodiment of the present invention.

FIG. 8 is a graph showing an example of the relationship between the photosynthetic optical quantum density and the rate of change in the amount of vitamin C when Korean cabbage is stored for 3 days.

FIG. 9 is a diagram showing an example of energy values of green light and red light with the same optical quantum beam density.

Fig. 10 is a graph showing the relationship between the radiant energy ratio R / G of green light and red light, and the total energy of green light and red light.

FIG. 11 is a diagram showing an example of the energy value of the total optical quantum beam density equal to that of FIG. 7 when the ratio of the energy values of the green light and the red light is 1: 2.

FIG. 12 is a diagram showing an example of a comparison of vitamin C content when Korean cabbage is stored for 3 days under plural light irradiation conditions.

Fig. 13 is a time chart of light irradiation control of each light source included in the light emitting section of the refrigerator according to the first embodiment of the present invention and the opening and closing states of the vegetable compartment door.

Fig. 14 is a diagram showing a configuration of a light-emitting section included in a refrigerator according to a second embodiment of the present invention.

Fig. 15 is a time chart of light irradiation control of each light source included in a light emitting section of a refrigerator in Embodiment 2 of the present invention.

Fig. 16 is a flowchart showing a light irradiation control flow of the refrigerator according to the second embodiment of the present invention.

FIG. 17 is a diagram showing an example of comparison of vitamin C content when Korean cabbage is stored for 3 days under plural light irradiation conditions.

Fig. 18 is a diagram showing a configuration of a light-emitting section included in a refrigerator according to a third embodiment of the present invention.

Embodiments for carrying out the present invention will be described with reference to the drawings. In each figure, the same or equivalent parts are marked with the same symbols, and repeated explanation is appropriately simplified or omitted. In addition, the present invention The invention is not limited to the embodiment described below, and can be modified within a range not departing from the gist of the present invention.

Embodiment 1.

1 to 13 are the first embodiment of the present invention. FIG. 1 is a front view of the refrigerator, FIG. 2 is a longitudinal sectional view of the refrigerator, and FIG. 3 is an enlarged view of the vegetable compartment of FIG. 2. Fig. 4 is a diagram showing the structure of a light-emitting section of the refrigerator, Fig. 5 is a block diagram showing a structure of a control system of the refrigerator, and Fig. 6 is a time chart of light irradiation control of each light source provided in the light-emitting section of the refrigerator Fig. 7 is a flowchart of the light irradiation control flow of the refrigerator, and Fig. 8 is a diagram showing an example of the relationship between the photosynthetic light quantum density and the rate of change of vitamin C content when Korean cabbage is stored for 3 days, and Fig. 9 is a diagram An example of the energy values of green light and red light with the same optical quantum beam density. Figure 10 is a graph showing the relationship between the radiant energy ratio R / G of green light and red light, and the total energy of green light and red light. FIG. 11 is a diagram showing an example of the energy value of a total optical quantum beam density equal to that of FIG. 7 when the ratio of the energy values of green light and red light is 1: 2, and FIG. Comparison of Vitamin C Amount at 3 Days FIG opening and closing state of the light emitting portion of a time chart of the embodiment of the present invention, graph 13 of the refrigerator 1 having a light irradiation control vegetable compartment door sheet and each light source.

Moreover, in each figure, the dimensional relationship, shape, etc. of each constituent member may differ from an actual article. In addition, in principle, the positional relationship (such as the up-and-down relationship) among the constituent members is to set the refrigerator in a usable state. Position relationship.

(Composition of refrigerator)

The refrigerator 1 according to the first embodiment of the present invention includes a heat insulation box 90 as shown in FIG. 2. The heat-insulating box 90 is open at the front (front) and forms a storage space inside. The heat insulation box 90 includes an outer box, an inner box, and a heat insulating material. The outer box is made of steel. The inner box is made of resin. The inner box is disposed inside the outer box. The heat insulating material is, for example, foamed polyurethane, which fills the space between the outer box and the inner box. The storage space formed inside the heat-insulating box 90 is divided into a plurality of storage rooms for storing and storing food by one or a plurality of partition members.

As shown in FIGS. 1 and 2, the refrigerator 1 includes, for example, a refrigerating compartment 100, a switching compartment 200, an ice-making compartment 300, a freezing compartment 400, and a vegetable compartment 500 as a plurality of storage compartments. These storage rooms are arranged in four stages in the vertical direction in the heat-insulating box 90.

The refrigerator compartment 100 is arranged at the uppermost stage of the heat insulation box 90. The switching chamber 200 is disposed on one of the left and right sides below the refrigerating chamber 100. The cooling temperature zone of the switching chamber 200 can be selected and switched to any one of a plurality of temperature zones. For example, a plurality of temperature zones can be selected as the cooling temperature zone of the switching chamber 200: a freezing temperature zone (for example, about -18 ° C), a refrigerating temperature zone (for example, about 3 ° C), a cooling temperature zone (for example, about 0 ° C), and Weak freezing temperature zone (for example, about -7 ° C). The ice-making chamber 300 is adjacent to the side of the switching chamber 200 and is juxtaposed with the switching chamber 200, that is, the ice-making chamber 300 is disposed on the other side of the left and right sides below the refrigerating chamber 100.

The freezing compartment 400 is disposed below the switching compartment 200 and the ice-making compartment 300. The freezer compartment 400 is mainly used when the storage object is stored for a relatively long period of time. The vegetable compartment 500 is disposed at the lowermost stage below the freezing compartment 400. Vegetable Room 500 Master If it is used to store vegetables or large PET bottles with a large capacity (for example, 2L).

An opening portion formed in front of the refrigerator compartment 100 is provided with a rotary refrigerator compartment door 7 that opens and closes the opening portion. Here, the refrigerator compartment door sheet 7 is a double-opening type (half-open type), and is composed of a right door sheet 7a and a left door sheet 7b. An operation panel 6 is provided on the outer surface of the refrigerator compartment door 7 (for example, the left door 7b) in the front of the refrigerator 1. The operation panel 6 includes an operation portion 6 a and a display portion 6 b. The operation section 6 a is an operation switch for setting the cold storage temperature of each storage room and the operation mode (such as a defrosting mode) of the refrigerator 1. The display portion 6b is a liquid crystal display that displays various information such as the temperature of each storage room. The operation panel 6 may be provided with a touch panel that doubles as the operation portion 6 a and the display portion 6 b.

Each of the storage compartments (the switching compartment 200, the ice making compartment 300, the freezing compartment 400, and the vegetable compartment 500) other than the refrigerator compartment 100 is opened and closed by a drawer-type door. These drawer-type door pieces can be opened and closed in the depth direction (front-rear direction) of the refrigerator 1 by sliding a frame fixedly provided on the door pieces relative to a rail formed horizontally on the left and right inner wall surfaces of each storage compartment.

Furthermore, a switching room storage box 201 and a freezing room storage box 401 that can store food and the like therein can be housed inside the switching room 200 and the freezing room 400 in a freely retractable manner, respectively. Similarly, in the inside of the vegetable compartment 500, an upper storage box 11 and a lower storage box 10 that can store food and the like can be accommodated in a freely retractable manner.

(Cooling mechanism)

The refrigerator 1 includes a refrigerating cycle circuit for cooling air to be supplied to each storage compartment. The refrigeration cycle circuit includes a compressor 2, a condenser (not shown), a pressure reducing device (not shown), a cooler 3, and the like. The compressor 2 compresses and discharges the refrigerant in the refrigeration cycle circuit. The condenser condenses the refrigerant discharged from the compressor 2. Decompression device The refrigerant flowing from the condenser is expanded. The cooler 3 cools the air to be supplied to each of the storage compartments with the refrigerant that has been expanded in the decompression device. The compressor 2 is arranged, for example, on the lower portion of the rear side of the refrigerator 1.

The refrigerator 1 forms an air path 5 for supplying air cooled by the refrigeration cycle circuit to each storage compartment. This air path 5 is mainly arranged on the back side in the refrigerator 1. The cooler 3 of the refrigerating cycle circuit is installed in the air path 5. Furthermore, a blower fan 4 is provided in the air passage 5 to blow the air cooled by the cooler 3 to each storage room.

When the blower fan 4 is operated, the air (cold air) cooled by the cooler 3 is blown to the freezing compartment 400, the switching compartment 200, the ice-making compartment 300, and the refrigerating compartment 100 through the air passage 5, and cools these storage compartments. The vegetable compartment 500 is cooled by introducing the cold air returned from the refrigerating compartment 100 into the vegetable compartment 500 through the refrigerating compartment return air passage. The cold air that has cooled the vegetable compartment 500 passes through the return air path for the vegetable room and returns to the air path 5 with the cooler 3 (the return air path is not shown). Then, it is cooled again by the cooler 3, and the cold air is circulated in the refrigerator 1.

An airlock (not shown) is provided halfway from the air path 5 to each storage room. Each air lock opens and closes where the air passage 5 leads to each storage room. By changing the opening / closing state of the airlock, it is possible to adjust the amount of airflow of the cold air supplied to each storage room. Furthermore, the temperature of the cold air can be adjusted by controlling the operation of the compressor 2.

The refrigerating cycle circuit composed of the compressor 2 and the cooler 3 described above, the air supply fan 4, the air passage 5, and the air lock are provided to form a cooling device that cools the inside of the storage room.

A control device 8 is housed in, for example, an upper portion of the back side of the refrigerator 1. The control device 8 includes controls for performing various controls necessary for the operation of the refrigerator 1. 制 电路 等。 System circuits. The control circuit included in the control device 8 is, for example, a circuit that controls the operations of the compressor 2 and the blower fan 4 and the opening degree of the airlock based on the temperature in each storage room and information input to the operation panel 6. That is, the control device 8 controls the above-mentioned cooling device and the like, and controls the operation of the refrigerator 1. In addition, the temperature in each storage chamber can be detected by a thermistor (not shown) or the like provided in each storage chamber.

(Composition of vegetable room)

FIG. 3 is a partial cross-sectional view of a vegetable compartment 500 included in the refrigerator 1. The vegetable room 500 is a storage room for storing food, especially vegetables. The lower storage box 10 is supported by a frame (not shown) of the vegetable compartment door 9. The upper storage box 11 is placed on the upper side of the lower storage box 10. When the vegetable room door piece 9 is pulled out forward, the lower storage box 10 and the upper storage box 11 are pulled out together with the vegetable room door piece 9 to the front. When the vegetable compartment door 9 is pulled out, when only the upper storage box 11 is slid rearward, only the lower storage box 10 is pulled out. In a state where only the lower storage box 10 is pulled out, food can be put into or taken out of the lower storage box 10.

Inside the vegetable room 500, a door opening / closing detection switch 12, a thermistor 13 and a light emitting section 14 are provided. The door opening / closing detection switch 12 is a device for detecting the opening / closing state of the vegetable room door 9. The door opening / closing detection switch 12 is provided in the edge portion of the front opening of the vegetable room 500 and is opposed to the vegetable room door 9.

A thermistor 13 and a light-emitting portion 14 are mounted on a back portion in the vegetable compartment 500. The thermistor 13 detects the temperature in the vegetable compartment 500. The light emitting unit 14 can irradiate visible light inside the vegetable compartment 500 as a storage compartment. Here, in the back surface of the lower storage box 10, an opening is formed in a portion facing the light emitting portion 14. 15. In addition, the light emitting unit 14 can transmit visible light to the inside of the lower storage box 10 through the opening 15. In addition, at least a portion of the lower storage box 10 corresponding to the opening portion 15 may be made of a material having a property of transmitting visible light radiated by the light emitting portion 14.

(Structure of the light emitting section)

Next, the configuration of the light emitting section 14 will be described further with reference to FIG. 4. As shown in FIG. 4, the light emitting section 14 includes two types of light sources: a first light source 16 a and a second light source 16 b. As described above, the light emitting section 14 can irradiate visible light. Therefore, the light emitting section 14 includes a visible light source that emits visible light. The first light source 16a and the second light source 16b are visible light sources. The first light source 16a and the second light source 16b are configured to be independently turned on and off.

The first light source 16a irradiates light having a first wavelength as a center wavelength. The second light source 16b irradiates light having a second wavelength as a center wavelength. Both the first wavelength and the second wavelength belong to the visible light range. However, the second wavelength is different from the first wavelength.

Specifically, the first wavelength which is the center wavelength of the first light source 16a is preferably 500 nm or more and 700 nm or less, and preferably 600 nm or more and 700 nm or less. That is, the light irradiated from the first light source 16a is red light. Specifically, for example, a red LED can be used as the first light source 16a.

The second wavelength, which is the center wavelength of the second light source 16b, is 500 nm to 560 nm. That is, the light irradiated from the second light source 16b is green. Specifically, for example, a green LED can be used as the second light source 16b. That is, the second wavelength belongs to the visible light range and is a shorter wavelength than the first wavelength.

The first light source 16a irradiates light with a first radiation intensity. The second light source 16b irradiates light with a second radiation intensity. The second radiation intensity is an intensity different from the first radiation intensity. Here, the second radiation intensity is lower than the first radiation intensity. Specifically, the first one The ratio of the radiation intensity to the second radiation intensity is 2: 1.

The light amount and number of the elements constituting the first light source 16a and the second light source 16b provided in the light emitting section 14 are selected so that the radiation intensities of the first light source 16a and the second light source 16b satisfy the relationship as described above. Specifically, in the light-emitting section 14, two elements constituting the first light source 16a are provided, and one element constituting the second light source 16b is provided.

(Control system of refrigerator)

FIG. 5 is a block diagram showing a functional configuration of a control system of the refrigerator 1. In FIG. 5, a part related to the control of the vegetable room 500 is particularly shown. The control device 8 includes, for example, a microcomputer including a processor (CPU: Central Processing Unit) 8a and a memory 8b. The control device 8 executes a program stored in the memory 8b by a processor (CPU) 8a, thereby executing a process set in advance to control the refrigerator 1.

The temperature detection signal in the vegetable compartment 500 is input to the control device 8 from the thermistor 13. The operation signal from the operation section 6 a of the operation panel 6 is also input to the control device 8. The detection signal from the door opening / closing detection switch 12 is also input to the control device 8.

The control device 8 executes processing based on the input signals to control the operations of the compressor 2 and the air-sending fan 4, so that the inside of the vegetable compartment 500 is maintained at a set temperature. The control device 8 outputs a display signal to the display portion 6 b of the operation panel 6.

The control device 8 also outputs a control signal to the light emitting section 14 to control the light emitting operation of the light emitting section 14. As described above, the light emitting section 14 includes the first light source 16a and the second light source 16b. In addition, the control device 8 can separate the on and off states of the first light source 16 a and the second light source 16 b included in the light emitting section 14 from each other. 地 控制。 Control.

(Control of light emitting section)

Next, control of the light emitting operation of the light emitting unit 14 by the control device 8 will be described with reference to FIG. 6. The control device 8 controls the operation of the light emitting section 14 so that it repeatedly executes an irradiation program for causing the light emitting section 14 to irradiate light containing visible light and a non-irradiation program for preventing the light emitting section 14 from irradiating light containing visible light. That is, according to the control of the control device 8, the light emitting section 14 alternately executes the irradiation procedure for irradiating light and the non-irradiation procedure for not irradiating light.

In the irradiation procedure, both the first light source 16a and the second light source 16b are turned on. In the non-irradiation procedure, neither the first light source 16a nor the second light source 16b is turned on. The duration of each program is set in advance. The duration of the irradiation program was set to ΔT1, and the duration of the non-irradiation program was set to ΔT2, respectively.

In this manner, the control device 8 controls the light emitting unit 14 so that the irradiation program and the non-irradiation program are sequentially executed. After the non-irradiation procedure is completed, the irradiation procedure is started again, and the procedures are repeatedly performed in the aforementioned order. Therefore, the time ΔT for each cycle of each program execution is sequentially taken as the total time of ΔT1 and ΔT2.

The control device 8 controls the light emitting unit 14 so that the irradiation program and the non-irradiation program are repeatedly executed in a cycle of 24 hours or less. That is, it is set such that ΔT is 24 hours or less. In addition, the light emitting section 14 repeatedly executes the irradiation procedure and the non-irradiation procedure in a cycle of 24 hours or less.

The duration ΔT2 of the non-irradiation program is set to be equal to or less than the duration ΔT1 of the irradiation program. Specifically, an example of the duration of each program that satisfies the above conditions is that ΔT1 is set to 12 hours and ΔT2 is set to 12 hours. here In the case, ΔT was 24 hours.

A series of processes for controlling the light emitting section 14 of the vegetable compartment 500 included in the refrigerator 1 configured as described above will be described with reference to the flowchart in FIG. 7. When the refrigerator 1 is powered on, first, in step S101, the control device 8 turns on the first light source 16a and the second light source 16b of the light emitting section 14. Next, in step S102, the control device 8 resets the value of the timer t for measuring the elapsed time to 0, and starts counting with the timer.

Next, in step S103, the control device 8 checks whether the elapsed time t of the timer has reached ΔT1. If the elapsed time t of the timer has not reached ΔT1, the confirmation step of step S103 is repeated until the elapsed time t of the timer reaches ΔT1. When the elapsed time t of the timer reaches ΔT1, step S104 is performed. The above steps S101 to S103 are irradiation procedures.

In step S104, the control device 8 turns off the first light source 16a and the second light source 16b of the light emitting section 14. Next, in step S105, the control device 8 resets the value of the timer t for measuring the elapsed time to 0, and starts counting with the timer.

Next, in step S106, the control device 8 checks whether the elapsed time t of the timer has reached ΔT2. If the elapsed time t of the timer has not reached ΔT2, the confirmation step of step S106 is repeated until the elapsed time t of the timer reaches ΔT2. Then, when the elapsed time t of the timer reaches ΔT2, the process returns to step S101 and the above steps are repeated. The above steps S104 to S106 are non-irradiation procedures.

(Effect of light irradiation)

Next, the effects expected from the light irradiation of the light emitting section 14 as described above will be described. First, the photosynthetic response of plants will be explained. The photosynthesis reaction can be represented by the following formula (1).

6CO ₂ + 12H ₂ O + 688kcal → C ₆ H ₁₂ O ₆ + 6H ₂ O + 6O ₂ (1)

In the formula (1), CO ₂ : carbon dioxide, H ₂ O: water, 688 kcal: light energy, C ₆ H ₁₂ O ₆ : glucose.

According to the photosynthesis reaction of formula (1), plants use light energy to produce oxygen and sugar from carbon dioxide in the atmosphere and water possessed by plants. This reaction is divided into two stages. In the first stage, light energy absorbed by pigments such as chlorophyll in leaves and the like is used to break down water into hydrogen and oxygen, and chemical energy is stored by the action of enzyme proteins. In the second stage, electrons, hydrogen ions, and carbon dioxide and glucose in the atmosphere are used. Vegetables with increased glucose have better storage properties and produce vitamin C from glucose.

In order for photosynthesis to be actively performed, it is necessary to make the light irradiated into the vegetable compartment 500 be light effective for photosynthesis. It is known that the absorption spectrum of chlorophyll has two light absorption peaks located in red (near 660 nm) and blue (near 450 nm), and this wavelength is particularly effective for photosynthesis.

In addition, green (500 to 600 nm) has a low absorption rate for chlorophyll, but light is scattered in the leaves with a frequency of encountering chlorophyll, and the absorption rate is high in the entire leaf. Therefore, by irradiating both the red light and the green light as the auxiliary light in accordance with the absorption spectrum, chlorophyll in the entire leaf can be activated, and photosynthesis can be performed efficiently.

Here, the amount of light that can be used for photosynthesis can be measured by photosynthetic light quantum beam density (unit: μmol / (m ^ 2.s)). The so-called photosynthesis optical quantum beam density system refers to the number of light quantums per square meter per second in the wavelength range of 400 nm to 700 nm that chlorophyll can absorb.

Fig. 8 shows the measurement of the rate of change in the amount of vitamin C when the vegetables were stored in the vegetable room for 3 days and their photosynthesis was compared with the photosynthetic light quantum density. The results. From the graph in FIG. 8, it can be seen that the higher the photosynthetic photon beam density, the more the photosynthesis is promoted, and the vitamin C contained in vegetables tends to increase.

Here, a certain relationship between the light quantum number n [mol] contained in the irradiated light and the radiant energy Q [J] of the light is known as shown in the following formula (2).

In addition, in this formula (2), e: energy of one photon quantum [J], Na: Avogadrian constant (= 6.02 × 10 ^ 23), λ: wavelength [nm], h: Planck's constant (= 6.63 × 10 ^ -34) [Js], C: speed of light (= 3.00 × 10 ^ 8) [m / s].

From the expression (2), it can be seen that the longer the wavelength of the light to be irradiated, the larger the number of light quanta contained in the light.

FIG. 9 is a diagram showing an example of energy values required when green light and red light have equal optical quantum beam densities. Compared with green light, red light can obtain the same optical quantum beam density at low emission energy. In addition, Fig. 10 shows the relationship between the radiant energy ratio R / G of the green light and the red light and the total energy of the green light and the red light when the total light quantum beam density of the green light and the red light is set to an arbitrary constant value. . Under the condition that the total photon beam density is constant, the larger the radiation energy ratio R / G of red light to green light, the smaller the total energy.

That is, the ratio of the red light is higher than that of the green light, and the same total optical quantum beam density can be obtained with a smaller total energy. In addition, it can be seen from FIG. 10 that the radiation energy ratio R / G is 2 or more, and the total energy can be sufficiently small. The same amount of optical quantum beam density is obtained.

Therefore, FIG. 11 shows an example of the energy value of the total optical quantum beam density equivalent to that of FIG. 9 when the ratio of the radiant energy of green light and red light is 1: 2. In this way, when the ratio of the radiant energy of green light and red light is 1: 2, as in the example of FIG. 9, the total optical quantum beam density is 35 + 85 = 120 [μmol / (m ^ 2.s)], but The total radiation energy is 8 + 16 = 24 [W / m ^ 2], which is smaller than 26 [W / m ^ 2] in the example in FIG. 9.

As described above, in Embodiment 1 of the present invention, the first light source 16a irradiates red light with a first radiation intensity. The second light source 16b irradiates green light with a second radiation intensity. The second radiation intensity is different from the first radiation intensity. Here, the second radiation intensity is lower than the first radiation intensity. Specifically, the ratio of the first radiation intensity to the second radiation intensity is 2: 1.

In the irradiation procedure of the irradiation light, the light emitting unit 14 irradiates light with a first radiation intensity from the first light source 16a and irradiates light with a second radiation intensity from the second light source 16b. Therefore, more light quantum beam density can be obtained with a smaller total radiated energy, and photosynthesis of vegetables irradiated with light can be efficiently promoted.

In addition, the above description is made for the case described below: the radiation energy values of the light radiated from the first light source 16a and the second light source 16b are fixed, and the light source 14 is provided in advance to constitute the first light source 16a and the second light source 16b. The element satisfies the relationship of the radiation energy value as described above. In this regard, it is not limited to this. For example, a device capable of changing the light amount may be used as the first light source 16a and the second light source 16b, and the control device 8 adjusts the light amounts of the first light source 16a and the second light source 16b to satisfy the foregoing. The relationship between the radiant energy value.

Following this, the plant's general diurnal rhythm maintains a self-regulating period of approximately 24 hours without giving time information such as the light-dark cycle of light. However, in the case where vegetables and fruits such as vegetables are stored in a dark environment without being irradiated with light, no photosynthesis is performed, and thus effects such as storage improvement and nutrient increase cannot be obtained. On the other hand, when the fruits and vegetables are stored in a bright environment that is continuously irradiated with light, although photosynthesis is performed, obstacles such as those described below are induced: insufficient nutrients are produced, or photosynthesis speed or photosynthetic capacity is reduced.

Therefore, in the refrigerator 1 of the present invention, as described above, the light-emitting portion 14 of the vegetable room 500 performs the visible light irradiation procedure for irradiating light containing visible light and repeatedly does not Procedure for non-irradiation of visible light.

Therefore, the lower storage box 10 is in a dark period which becomes a bright environment in which visible light is irradiated and a dark period which becomes a dark environment in which visible light is not irradiated with time. That is, in the lower storage box 10, an environment that simulates a change in the amount of light in nature due to a rising sun and a sunset is realized. Therefore, plants such as fruits and vegetables that have been placed in the lower storage box 10 can be promoted to perform activities such as photosynthesis in accordance with the general rhythm.

In addition, the general diurnal rhythm of plants is a period of about 24 hours corresponding to the time from morning to night and then to morning. However, the general diurnal rhythm of plants has the characteristics described later, and the phase of the rhythm is changed by the influence of ambient light. For example, when the light is irradiated in a dark environment and becomes a bright environment, the rhythm phase is shifted toward the morning side. With this feature, the time of the non-irradiation program is made shorter than that of the visible light irradiation program (that is, the dark period in which the light is not irradiated is shorter than the light period in which the light is irradiated), so that the period of light irradiation is 24 hours or less, thereby increasing the Fruits and vegetables in the lower storage box 10 The proportion of time during which photosynthesis is performed during storage. Therefore, by increasing the proportion of time during which photosynthesis is performed during storage, the production efficiency of nutrients such as sugar and vitamin C of vegetables and fruits can be improved.

Here, referring to FIG. 12, a specific comparative example is used to explain what happens to the amount of nutrients (vitamin C) contained in fruits and vegetables when the fruits and vegetables are stored under a plurality of different light irradiation conditions as described above. Kind of difference. FIG. 12 is a graph showing a comparison of the amount of vitamin C after the cabbage has been stored for three days under a plurality of different light irradiation conditions. The ratio of the change in the amount of vitamin C is represented by the initial amount of vitamin C before the preservation is 100. The conditions for light irradiation are such that the light intensity is the same, and the color light included in the irradiated light and the irradiation time per day are changed.

In a non-irradiated state with no irradiation light at all for one day, the amount of vitamin C after storage was smaller than that in the initial period (the leftmost graph in FIG. 12). On the other hand, the amount of vitamin C after storage has increased from the initial stage under any light irradiation conditions. Compared with the case where the light is continuously irradiated during one day (the graph in the center of Fig. 12), there is a period of time during which the light is not irradiated (that is, the dark period). The result of a higher amount of vitamin C increase (rightmost graph in Figure 12).

In this way, light of appropriate wavelengths is irradiated in accordance with the general diurnal rhythm of vegetables and fruits, so that photosynthesis and nutrient production can be performed efficiently, and the effects of improving the storability and nutrient increase of vegetables under storage can be achieved. That is, according to the refrigerator 1 of the present invention, by performing light irradiation that simulates light changes in the natural world and utilizing the daily rhythm of vegetables and fruits, it is possible to control activities such as photosynthesis of vegetables and fruits and promote the production of nutrients caused by photosynthesis. It also suppresses unnecessary evapotranspiration and preserves vegetables with high quality.

(Other examples of control of the light emitting section)

In the control of the light emitting unit 14 described above, it is not specifically described in which time zone of a day the irradiation program and the non-irradiation program are executed. Here, with reference to FIG. 13, the control of the light-emitting section 14 such as the time zone during which a non-irradiation program is executed in accordance with the detection result of the open / closed state of the vegetable room door 9 will be described as another example of the control of the light-emitting section 14.

As described above, the vegetable compartment door panel 9 is a door panel capable of opening and closing the vegetable compartment 500 serving as a storage compartment. Furthermore, the door opening / closing detection switch 12 is a detection device for detecting the opening and closing of the vegetable room door 9. The control device 8 calculates the number of times of opening and closing the vegetable room door panel 9 detected by the door panel opening / closing detection switch 12 in each predetermined time (that is, each reference time set in advance). The reference time at this time is, for example, the duration ΔT2 of the non-irradiation program. Then, the control device 8 controls the light-emitting section 14 so that the non-irradiation program is executed in a time zone in which the number of times the vegetable compartment door 9 is opened and closed at a predetermined time is equal to or less than a preset number of times.

The door of the refrigerator 1 is usually opened and closed when preparing food or before and after shopping, and the user is not opened or closed while sleeping or when going out. Therefore, in daily life, changes in the number of door openings and closings in a day can be modeled and predicted. Therefore, the control device 8 counts the number of times of opening and closing the door 9 of the vegetable compartment, and memorizes a time zone with a small number of times of opening and closing of the door every a certain period of time in a memory section (not shown). Then, the non-irradiation program is started in the memorized time zone after the second day, or 24 hours after the memorized time zone, so that the non-irradiation program can be executed in a time zone with a small number of openings and closings.

If the vegetable room door 9 is opened and closed during the non-irradiation process, the effect of the light from the outside of the refrigerator 1 may cause the vegetables and fruits to be stored for a long time. The phase of the rhythm changes. Therefore, the non-irradiation process is performed in a time zone in which the number of openings and closings of the vegetable room door 9 is small, thereby ensuring that the dark period of the fruits and vegetables in the lower storage box 10 is not irradiated with light, and it is possible to efficiently perform the whole day Rhythmic light exposure control.

In addition, the user can switch the implementation and stop of the light irradiation control of the light-emitting section 14 by operating the operation section 6 a of the operation panel 6 provided in the refrigerator door 7 (the light-emitting section 14 is always turned off). The user can use the operation panel 6 to select whether or not to control the lighting of the light-emitting portion 14. Thus, when it is not necessary to save or there is no long-term use of fruits and vegetables, etc., the user can choose to stop so that the light-emitting portion 14 is always off. Lamp to reduce the energy consumption and provide a way of use like a normal refrigerator 1.

In the implementation of the light irradiation control, "light irradiation" or the like may be displayed on the display portion 6b of the operation panel 6. In addition, the display portion 6b may display "lighting up" in a visible light irradiation program (bright period), and "lighting out" in a non-irradiation program (dark period). In addition, the state of the light in the refrigerator (in the vegetable room 500) may be changed to a one-day display of natural light, and this may be displayed on the display portion 6b. Specifically, for example, in accordance with a program being implemented in the light irradiation control, the display section 6b displays "daytime" in the irradiation program, "night" in the non-irradiation program, and the like. Thereby, the state of the light in a refrigerator can be notified to a user, and convenience and satisfaction can be improved. In addition, the user can be reminded not to perform unnecessary door opening and closing during the non-irradiation procedure.

In addition, the operation panel 6 is not limited to be provided outside the refrigerator 1, and may be provided in a refrigerator (storage room). In addition, a communication device may be installed in the refrigerator 1, and a mobile information terminal (including a smart hand) Mobile phone, tablet terminal, etc.) to transmit instructions to the control device 8 of the refrigerator 1, or to receive and display information of the refrigerator 1. That is, the mobile information terminal may have one or both of the functions of the operation section 6 a and the display section 6 b of the operation panel 6.

The refrigerator configured as described above includes a storage room vegetable room 500 for storing food, and a light emitting section 14 capable of irradiating visible light inside the storage room. In addition, the light emitting section 14 includes a first light source 16a that irradiates light with a first wavelength in the visible light range as a center wavelength, and a second light source 16b that irradiates a second wavelength with a wavelength in the visible light range shorter than the first wavelength described above. Is the light of the center wavelength. The light emitting unit 14 irradiates light at a first radiation intensity from the first light source 16a in the irradiation procedure of the irradiation light, and irradiates light at a second radiation intensity different from the first radiation intensity from the second light source 16b.

Here, in particular, the second radiation intensity is lower than the first radiation intensity, specifically, the ratio of the first radiation intensity to the second radiation intensity is 2: 1. Therefore, it is possible to achieve a certain photosynthesis with less light radiation energy, without consuming excess energy, efficiently using light radiation energy, promoting photosynthesis of fruits and vegetables such as leafy vegetables, and promoting nutrients Production, and improve storage.

Embodiment 2.

14 to 17 are the second embodiment of the present invention. FIG. 14 is a diagram showing the configuration of a light-emitting section of the refrigerator, and FIG. 15 is a time chart of light irradiation control of each light source included in the light-emitting section of the refrigerator. FIG. 16 is a flowchart of a light irradiation control flow of the refrigerator, and FIG. 17 is a diagram showing an example of comparison of vitamin C amount when cabbage is stored for 3 days under a plurality of light irradiation conditions.

The second embodiment described here is different from the first embodiment described above. In addition to the configuration, a third light source 16c is provided in the light emitting section 14. Furthermore, the irradiation program includes two programs: a first irradiation program in which all of the first light source 16a to the third light source 16c are turned on, and a third light source 16c to turn off the light and only the first light source 16a and the second light source 16b. The second irradiation program that lights up.

Hereinafter, the refrigerator according to the second embodiment will be described focusing on the differences from the first embodiment.

That is, as shown in FIG. 14, the light emitting section 14 includes a third light source 16 c in addition to the first light source 16 a and the second light source 16 b. The third light source 16c is a visible light source like the first light source 16a and the second light source 16b. These three light sources can be turned on and off independently.

The third light source 16c irradiates light having a third wavelength as a center wavelength. The third wavelength belongs to the visible light range. The third wavelength is different from the first wavelength and the second wavelength. Here, the third wavelength is shorter than the second wavelength (therefore, of course, shorter than the first wavelength). Specifically, the third wavelength of the center wavelength of the third light source 16c is 400 nm or more and 500 nm or less. That is, the light irradiated from the third light source 16c is blue. Specifically, for example, a blue LED can be used as the third light source 16c.

The third light source 16c irradiates light with a third radiation intensity. The third radiation intensity is an intensity different from the first radiation intensity and the second radiation intensity. Here, the third radiation intensity is lower than both the first radiation intensity and the second radiation intensity. Specifically, the ratio of the first radiation intensity to the third radiation intensity is 5: 1. The ratio of the first radiation intensity to the second radiation intensity is 2: 1 as in the first embodiment. Therefore, the ratio of the first radiation intensity, the second radiation intensity, and the third radiation intensity is 10: 5: 2.

The light quantity and number of the elements constituting the first light source 16a, the second light source 16b, and the third light source 16c provided in the light emitting section 14 are selected so that the radiation intensities of the first light source 16a to the third light source 16c satisfy the relationship as described above. . Specifically, Here, in the light emitting section 14, two elements constituting the first light source 16a are provided, and one element constituting the second light source 16b and the third light source 16c is provided.

Next, control of the light emitting operation of the light emitting unit 14 by the control device 8 will be described with reference to FIG. 15. The control device 8 controls the operation of the light emitting section 14 so that it repeatedly executes an irradiation program for causing the light emitting section 14 to irradiate light containing visible light and a non-irradiation program for preventing the light emitting section 14 from irradiating light containing visible light. In the irradiation procedure, at least any one of the first light source 16a, the second light source 16b, and the third light source 16c is turned on. In the non-irradiation procedure, none of the first light source 16a, the second light source 16b, and the third light source 16c is turned on.

The irradiation procedure is divided into 2 procedures. In the irradiation procedure, a first irradiation procedure is performed first, and then a second irradiation procedure is performed. That is, the control device 8 controls the light emitting section 14 so that the first irradiation program and the second irradiation program are performed in the irradiation program. In the first irradiation program, the control device 8 irradiates the first light source 16a, the second light source 16b, and the third light source 16c with light. That is, red light, green light, and blue light are irradiated. In the second irradiation program, the control device 8 irradiates light to the first light source 16a and the second light source 16b, and turns off the third light source 16c. That is, red light and green light are irradiated, and blue light is not irradiated.

The duration of each program is set in advance. The duration of the first irradiation program was set to ΔT1, the duration of the second irradiation program was set to ΔT2, and the duration of the non-irradiation program was set to ΔT3.

In this manner, the control device 8 controls the light emitting unit 14 so that the first irradiation program, the second irradiation program, and the non-irradiation program are sequentially executed. After the non-irradiation procedure is finished, the visible light irradiation procedure (that is, the first irradiation procedure) is started, and each procedure is repeatedly performed in the aforementioned order. Therefore, each program is executed one at a time. The time ΔT of the cycle is the total time of ΔT1, ΔT2, and ΔT3. The duration of the visible light irradiation program is a total time of ΔT1 and ΔT2.

The control device 8 controls the light emitting section 14 so that the visible light irradiation program and the non-irradiation program are repeatedly executed in a cycle of 24 hours or less. That is, it is set such that ΔT is 24 hours or less. The duration ΔT3 of the non-irradiation program is set to be shorter than the duration of the visible light irradiation program. That is, the duration ΔT3 of the non-irradiation program is set to be less than the total time of the duration ΔT1 of the first irradiation program and the duration ΔT2 of the second irradiation program. The duration ΔT1 of the first irradiation program is set to be equal to or shorter than the duration ΔT2 of the second irradiation program. Specifically, an example of the duration of each program that satisfies the above conditions is that ΔT1 is set to 2 hours, ΔT2 is set to 10 hours, and ΔT3 is set to 12 hours. ΔT in this case was 24 hours.

A series of processes for controlling the light emitting section 14 of the vegetable compartment 500 included in the refrigerator 1 configured as described above will be described with reference to the flowchart in FIG. 16. When the refrigerator 1 is powered on, first, in step S201, the control device 8 turns on the first light source 16a, the second light source 16b, and the third light source 16c of the light emitting section 14. Next, in step S202, the control device 8 resets the value of the timer t for measuring the elapsed time to 0, and starts counting with the timer.

Next, in step S203, the control device 8 checks whether the elapsed time t of the timer has reached ΔT1. If the elapsed time t of the timer has not reached ΔT1, the confirmation step of step S203 is repeated until the elapsed time t of the timer reaches ΔT1. When the elapsed time t of the timer reaches ΔT1, step S204 is performed. The above steps S201 to S203 are the first irradiation procedures.

In step S204, the control device 8 causes the third light source of the light emitting section 14 to 16c goes out. Therefore, only the first light source 16a and the second light source 16b are turned on. Next, in step S205, the control device 8 resets the value of the timer t for measuring the elapsed time to 0, and starts counting with the timer.

Next, in step S206, the control device 8 checks whether the elapsed time t of the timer has reached ΔT2. If the elapsed time t of the timer has not reached ΔT2, the confirmation step of step S206 is repeated until the elapsed time t of the timer reaches ΔT2. When the elapsed time t of the timer reaches ΔT2, step S207 is performed. The above steps S204 to S206 are the second irradiation procedures.

In step S207, the control device 8 turns off the first light source 16a and the second light source 16b of the light emitting section 14. Therefore, the first light source 16a, the second light source 16b, and the third light source 16c are all turned off. Then, step S208 is performed, and the control device 8 resets the value of the timer t for measuring the elapsed time to 0, and starts counting with the timer.

Next, in step S209, the control device 8 checks whether the elapsed time t of the timer has reached ΔT3. If the elapsed time t of the timer has not reached ΔT3, the confirmation step of step S209 is repeated until the elapsed time t of the timer reaches ΔT3. Then, when the elapsed time t of the timer reaches ΔT3, it returns to step S201 and repeats the above steps. The above steps S207 to S209 are non-irradiation procedures.

The other configurations and operations are the same as those of the first embodiment, and detailed descriptions thereof are omitted.

Next, the effect that can be expected by irradiating the light with the light-emitting portion 14 as described above will be described. First, in Embodiment 2 of the present invention, the first light source 16a irradiates red light with a first radiation intensity. The second light source 16b irradiates green light with a second radiation intensity. The third light source 16c irradiates blue light at a third radiation intensity. here, The third radiation intensity is lower than the first radiation intensity and the second radiation intensity. Specifically, the ratio of the first, second, and third radiation intensity is 10: 5: 2.

In the irradiation procedure of the irradiation light, the light emitting unit 14 irradiates light from the first light source 16a with a first radiation intensity, and simultaneously irradiates light from the second light source 16b with a second radiation intensity, and further irradiates light from the third light source 16c with a first 3 Radiation intensity irradiates light. As described in the first embodiment, the longer the wavelength of the irradiated light, the larger the number of light quantums contained in the light. Therefore, it is possible to obtain a larger optical quantum beam density with a smaller total radiant energy, and it is possible to efficiently promote photosynthesis of vegetables irradiated with light.

In addition, as mentioned above, in addition to red (near 660 nm), the absorption spectrum of chlorophyll has a light absorption peak in blue (near 450 nm). This wavelength is particularly effective for photosynthesis. In addition, blue light has the effect of opening the stomata of plants. Therefore, the stomata of vegetables and fruits can be opened by irradiating light containing blue light in the early stage of the bright period of light irradiation. Moreover, the bright period continues after the stomata of the fruits and vegetables are opened, so that the fruits and vegetables can fully absorb carbon dioxide in the air, and can efficiently perform photosynthesis. On the other hand, blue light also promotes germination and flowering. Therefore, in the case of long-term storage of fruits and vegetables, it is better to shorten the time of blue light irradiation as much as possible.

Therefore, in the visible light irradiation program that promotes photosynthesis, first, the third light source 16c is turned on in the first irradiation program to irradiate light containing blue, and then the third light source 16c is turned off in the second irradiation program to irradiate. Without blue light, photosynthesis can be performed after the stomata of the fruits and vegetables in the lower storage box 10 are opened, and photosynthesis of the fruits and vegetables in the lower storage box 10 can be further promoted. Moreover, at this time, the first irradiation procedure for irradiating light containing blue light is made shorter than the irradiation The second irradiation procedure of the light that does not contain blue light can achieve a sufficient stomata opening effect without promoting germination and flowering as much as possible.

Here, referring to FIG. 17, a specific comparative example is used to explain what happens to the amount of nutrients (vitamin C) contained in fruits and vegetables when the fruits and vegetables are stored under a plurality of different light irradiation conditions as described above. Kind of difference. FIG. 17 is a diagram showing an example of a comparison of the amount of vitamin C in a case where cabbage has been stored for three days under a plurality of light irradiation conditions. The expression method of the vitamin C amount, the conditions of light irradiation, and the results at the time of non-irradiation are the same as those in FIG. 12, so descriptions are omitted.

When the light irradiation time (that is, the bright period) and the time when the light is not irradiated (that is, the dark period) are provided, when the light irradiation corresponding to the general rhythm is performed, the vitamin C after the preservation increases. In addition, it was found that there are results described below. Compared with the case where red light and green light are irradiated in the bright period of 12 hours (the graph in the center of FIG. 17), blue light is more radiated in the first two hours of the bright period of 12 hours. In the case of colored light (rightmost graph in Fig. 17), the amount of increase in vitamin C after storage is increased.

In the refrigerator configured as described above, in addition to achieving the same effects as in Embodiment 1, it is possible to achieve sufficient stomata opening without promoting germination and flowering, and to promote nutrient production by efficient photosynthesis. It produces and suppresses excess evapotranspiration and preserves vegetables with high quality.

Embodiment 3.

Fig. 18 is a view showing a third embodiment of the present invention and showing a configuration of a light-emitting section provided in a refrigerator.

Embodiment 3 described here is based on the configuration of Embodiment 1 or Embodiment 2 described above, so that the second radiation intensity (that is, the radiation intensity of green light) is higher than the first radiation intensity (that is, the radiation of red light). strength).

Hereinafter, the refrigerator according to the third embodiment will be described based on the configuration of the second embodiment, focusing on the differences from the second embodiment.

That is, as shown in FIG. 18, the light emitting section 14 includes a first light source 16a, a second light source 16b, and a third light source 16c. These three types of light sources are all visible light sources and can be turned on and off independently.

The first light source 16a, the second light source 16b, and the third light source 16c irradiate light having the first wavelength, the second wavelength, and the third wavelength as center wavelengths, respectively. Specifically, the first wavelength is 500 nm or more and 700 nm or less (preferably 600 nm or more and 700 nm or less), the second wavelength is 500 nm or more and 560 nm or less, and the third wavelength is 400 nm or more and 500 nm or less. Therefore, light emitted from the first light source 16a is red, light emitted from the second light source 16b is green, and light emitted from the third light source 16c is blue.

The first light source 16a, the second light source 16b, and the third light source 16c irradiate light with a first radiation intensity, a second radiation intensity, and a third radiation intensity, respectively. Here, unlike Embodiment 1 and Embodiment 2, the second radiation intensity is higher than the first radiation intensity. Specifically, for example, the ratio of the first radiation intensity to the second radiation intensity is 5: 6. In addition, the third radiation intensity is lower than both the first radiation intensity and the second radiation intensity, which is the same as the second embodiment. Specifically, the ratio of the first radiation intensity to the third radiation intensity is 5: 1 as in the second embodiment. Therefore, the ratio of the first radiation intensity, the second radiation intensity, and the third radiation intensity is 5: 6: 1.

The light quantity and number of the elements constituting the first light source 16a, the second light source 16b, and the third light source 16c provided in the light emitting section 14 are selected so that the radiation intensities of the first light source 16a to the third light source 16c satisfy the relationship as described above. . Specifically, here, in the light emitting section 14, two elements constituting the second light source 16b are provided, and one element constituting the first light source 16a and the third light source 16c is provided.

In the light irradiation procedure, the light emitting section 14 irradiates light with a first radiation intensity from the first light source 16a, and irradiates light with a second radiation intensity from the second light source 16b, and at the same time, emits light with a third radiation intensity from the third light source 16c. Shine light.

In addition, other configurations and operations are the same as those of the first embodiment or the second embodiment, and detailed descriptions thereof are omitted.

Here, the first light source 16a, the second light source 16b, and the third light source 16c irradiate high-intensity light. In this case, the photosynthesis of the fruits and vegetables (vegetables) that are exposed to light reaches the light saturation of the chlorophyll on the surface side of the leaves and the inside. Chlorophyll on the back side is easily in a state where it is not light-saturated. In this state, if the radiant energy of the first light source 16a (red) is increased, the absorption rate of red in the leaves is high, so it is absorbed by the chlorophyll on the surface side. However, photosynthesis in the surface side of the leaf has reached light saturation, so almost all the energy of the red light is emitted in the form of heat.

On the other hand, the second light source 16b (green LED) has a low absorptivity in the leaves, can activate the chlorophyll inside and on the back of the leaves that are not saturated with light, and can promote photosynthesis. Therefore, the second radiation intensity is made higher than the first radiation intensity, that is, the radiation energy of the second light source 16b (green) is increased, whereby the radiation energy emitted by the light source is not wasted, and photosynthesis can be efficiently performed.

The refrigerator configured as described above also includes a storage room for storing food as the vegetable compartment 500, and a light-emitting portion 14 that irradiates visible light inside the storage room. The light emitting unit 14 includes a first light source 16 a that irradiates light with a first wavelength in the visible light range as a center wavelength, and a second light source 16 b that irradiates light with a second wavelength in the visible light range shorter than the first wavelength as the center wavelength. . The light emitting unit 14 irradiates light from the first light source 16a at a first radiation intensity and irradiates light from the second light source 16b at a second radiation intensity in the irradiation light irradiation procedure.

Here, in particular, the second radiation intensity is higher than the first radiation intensity, specifically, the ratio of the first radiation intensity to the second radiation intensity is 5: 6. Therefore, it is possible to suppress wasteful light radiation energy that is converted into heat, efficiently utilize light radiation energy without consuming excess energy, promote photosynthesis of vegetables and fruits such as leafy vegetables during storage, and promote nutrients Production and improve storability.

[Industrial possibilities]

The present invention is applicable to a refrigerator including a light-emitting portion in a storage room for storing food, and radiating visible light to the inside of the storage room from the light-emitting portion.

Claims (10)

A refrigerator includes: a storage room for storing food; and a light-emitting portion capable of irradiating visible light inside the storage room; the pre-light-emitting portion includes: a first light source that irradiates light having a first wavelength in a visible light range as a center wavelength; A second light source irradiating light with a center wavelength at a second wavelength shorter than the first wavelength in the visible range in the visible light range; in the irradiation light irradiation procedure, the first light source irradiates light at the first radiation intensity in the previous description, At the same time, the second light source from the preamble irradiates light at a second radiation intensity higher than the first radiation intensity from the preamble. In the refrigerator described in item 1 of the patent application range, the first wavelength is 600 nm or more and 700 nm or less. In the refrigerator described in the second item of the patent application scope, the second wavelength is 500 nm or more and 560 nm or less. As described in any one of the items 1 to 3 of the scope of patent application, the ratio of the first radiation intensity in the preamble to the second radiation intensity in the preamble is 5: 6. The refrigerator according to any one of claims 1 to 3, wherein the pre-light-emitting section further includes a third light source whose illumination is centered on a third wavelength that is shorter than the second wavelength in the visible range. Light of a wavelength; in the prescriptive irradiation program, the first radiation intensity is irradiated with light from the first light source, and the second radiation intensity is irradiated with light from the second light source, and at the same time, the third light source is lightened with the previous The first radiation intensity and the third radiation intensity of the foregoing second radiation intensity are both irradiated with light. According to the refrigerator described in item 5 of the patent application scope, the third wavelength of the preamble is 400 nm or more and 500 nm or less. For the refrigerator described in item 5 of the scope of patent application, the ratio of the first radiation intensity to the third radiation intensity is 5: 1. In the refrigerator described in any one of claims 1 to 3 of the scope of patent application, the pre-light emitting section alternately executes the pre-irradiation procedure and the non-irradiation procedure without light irradiation. In the refrigerator described in item 8 of the scope of patent application, the pre-emission light-emitting section alternately executes the pre-exposure program and the pre-exposure program in a cycle of 24 hours or less. The refrigerator described in item 8 of the scope of patent application, further includes: a door piece capable of opening and closing the storage room; and a detection device for detecting the opening and closing of the door piece; a pre-lighting section, where the detection device is set in advance in the detection device; The non-irradiation procedure is performed in a time zone in which the number of openings and closings of the door panel detected during the reference time is less than or equal to a preset number of times.