JP2012220046A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator that includes a storage section provided in a refrigerator section and having a third temperature zone different from a refrigeration temperature zone, and emits light for illuminating the inside of the refrigerator section when a door thereof is opened, in different colors between the refrigerator section and the storage section, thereby visually notifying a user about difference of objects to be stored therein.SOLUTION: The refrigerator includes a refrigerator body 1 formed of heat insulation walls; a refrigerator section 2 provided at an upper part; a storage section 7 formed at a lower part in the refrigerator section 2; a first illumination device 30 which irradiates the inside of the refrigerator section 2; and a second illumination device 32 which irradiates the inside of the storage section 7. The storage section 7 can be set to the third temperature zone between the refrigeration temperature zone and a freezing temperature zone. When the storage section 7 is set to the third temperature zone and the door of the refrigerator section is opened, both the first illumination device 30 and the second illumination device 32 are turned on, and the color of the second illumination device 32 is different from that of the first illumination device 30, so that the user can visually recognize the difference.

Description

  A refrigerator that is related to a refrigerator and includes a light emitting element that irradiates light inside the refrigerator.

  Conventionally, as shown in FIG. 5, a refrigerator 40 including a semiconductor light emitting element that irradiates light in a cabinet is known. For example, Patent Document 1 discloses a refrigerator including a light emitting device 52 having an LED (Light Emitting Diode) on an inner wall at the back of a vegetable room 62 of the refrigerator.

  With this light emitting device, the vegetables stored in the vegetable compartment 62 are irradiated with light of a predetermined wavelength from behind, thereby illuminating the inside of the vegetable compartment and maintaining the freshness of the stored vegetables, for example. .

JP 2006-329614 A

  However, in the above conventional configuration, the vegetables stored in the vegetable compartment 62 are intermittently irradiated with light to give stress to the vegetables, stimulate self-defense functions, increase nutrients such as polyphenols, and improve freshness. It uses irradiation means as an additional function of food quality preservation and nutrition UP, and in particular, it is in the refrigerator compartment, separately from the refrigerator compartment lighting device (not shown) installed in the refrigerator compartment 60, and is refrigerated. A refrigerator having a built-in switching chamber which is a third temperature zone chamber (a chamber having a temperature zone between the freezing temperature and the refrigeration temperature) different from the temperature zone, as an illumination function for irradiating the switching chamber exclusively The problem of providing irradiation means and improving the visibility of the switching chamber is not disclosed.

  The switching chamber is a section that can be switched to the third temperature zone chamber and the chilled chamber. For example, the third temperature zone chamber is a slight freezing temperature zone of about −3 ° C., and is a chamber that can make meat and fish last longer than the refrigerator compartment 60. On the other hand, the chilled room is lower than the refrigerator room 2 and has a temperature range of about 1 ° C., and is suitable for storing dairy products such as yogurt and fresh cream, kneaded products such as kamaboko, and pickles.

  In particular, since the switching chamber that can be switched to the third temperature zone is formed in a part of the refrigerator compartment space, the switching chamber is thermally insulated in the refrigerator compartment, so the refrigerator compartment illumination means for illuminating the refrigerator compartment is There is a possibility that light cannot be transmitted into the third temperature zone chamber and visibility may be lowered.

  The present invention solves the above-described conventional problems, and is a refrigerator having a third temperature zone chamber in a refrigerator compartment, and a second temperature zone compartment second chamber separate from the first illumination means for the refrigerator compartment. Provided with a lighting unit, and a third temperature zone chamber having a temperature zone different from that of the refrigerator compartment is formed in the space of the refrigerator compartment, so that the user can visually recognize that the stored items are different. The purpose is to do.

In order to solve the above-described conventional problems, the refrigerator of the present invention includes a refrigerator main body formed of heat insulating walls, a refrigeration room provided at an upper part of the refrigerator main body, a storage room formed and partitioned at a lower part of the refrigeration room, In a refrigerator including a first lighting device that irradiates the refrigeration room and a second lighting device that irradiates the storage room, the storage room can set a temperature between a refrigeration temperature zone and a freezing temperature zone. When the storage room is set to the third temperature zone and the refrigerator door is opened, both the first lighting device and the second lighting device are turned on. The luminescent color emitted by the second lighting device is different from the luminescent color emitted by the first lighting device, so that it is possible to visually recognize that the stored items are different between the refrigerator compartment and the storage compartment. In the first lighting device, light reaches In which it becomes possible to irradiate have a storage compartment of the lower in the second illuminating device.

  Thereby, the third temperature zone room can be illuminated by providing the second illumination means.

  The refrigerator of this invention can improve the visibility and freshness of a 3rd temperature zone room different from the refrigeration temperature zone incorporated in a refrigerator compartment.

Front view of the refrigerator in Embodiment 1 of the present invention 1 is a cross-sectional view of the embodiment of the present invention taken along the line AA in FIG. The principal part enlarged view of FIG. 2 of embodiment of this invention FIG. 3 is a perspective view of the embodiment of the present invention. Schematic configuration diagram of a conventional refrigerator

  1st invention irradiates the refrigerator main body formed with the heat insulation wall, the refrigerator compartment provided in the upper part of the refrigerator main body, the storage compartment formed in the lower part of the refrigerator compartment, and the refrigerator compartment In the refrigerator comprising the apparatus and the second lighting device for irradiating the storage room, the storage room can be set to a third temperature zone in which the temperature between the refrigeration temperature zone and the freezing temperature zone can be set, When the storage room is set to a third temperature zone and the refrigerator door is opened, both the first lighting device and the second lighting device are turned on, and light emitted from the second lighting device Since the color is different from the emission color emitted by the first lighting device, it is possible to visually recognize that the stored items are different between the refrigerator compartment and the storage chamber. Illuminate the lower storage room where it is difficult to reach with the second lighting device It is possible to become.

  According to a second aspect of the present invention, in addition to the first aspect, a storage case having a wall surface that is arranged so as to be able to be pulled out in the storage chamber and has light permeability, and a rear wall disposed behind the storage case has the second illumination. The second lighting device irradiates from the back side toward the near side, and allows the inside of the storage case to be irradiated even when the storage case is pulled out toward the front side. When opening the storage case, pull the storage case forward to store the stored items, and then move the storage case backwards and close the refrigerator compartment door so that the interior of the storage case can be irradiated with the second lighting device. Can be prevented from being misidentified.

  According to a third aspect of the present invention, in addition to the first or second aspect of the present invention, a reflective member that reflects light is disposed in the storage chamber, so that the temperature in the storage chamber is equalized and the second lighting device is provided. Since the light is reflected in the storage chamber, the light reaches the user and can be visually recognized even when there are many items to be stored.

According to a fourth aspect of the present invention, in addition to any one of the first to third aspects, the first lighting device and the second lighting device include a light emitting element that emits a wavelength in a visible light region. The light emitting element of the second lighting device is a light emitting element having a central wavelength in the range of 400 nm to 500 nm. By making the light emitting element having a wavelength in this range, the temperature is lower than the temperature range of the refrigerator compartment. A space can be impressed and visibility can be improved.

(Embodiment 1)
Hereinafter, the refrigerator 1 which concerns on the form of this invention is demonstrated, referring drawings.

  FIG. 1 is a front view of a refrigerator schematically showing the refrigerator according to the embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA of FIG.

  As shown in FIG. 1, the refrigerator 1 according to the embodiment includes a storage compartment partitioned into five parts, an upper stage, a middle stage, and a lower stage. Specifically, the upper storage chamber is the refrigerator compartment 2, the freezer compartment 3 provided with a drawer door below, and the ice making room 5 provided with a drawer door in parallel therewith, provided with a drawer door arranged at the bottom. And a freezing room 4 disposed between the ice making room 5 and the vegetable room 6.

  Located below the refrigerating chamber 2, a heat insulating partition wall 11 c is formed that heats and separates the refrigerating chamber 2, the side-by-side ice making chamber 5 and the freezing chamber 3.

  In addition, as shown in FIG. 2, the refrigerator 1 formed by the heat insulating wall 11b filled between the outer box 12 and the inner box 13 has a storage room 7 defined in the lower part of the refrigerating room 2 provided at the upper part. Yes. In the case of the embodiment, the storage chamber 7 is configured as a switching chamber, and is a third temperature of about −3 ° C. that is a temperature zone between a refrigeration temperature zone of 0 ° C. or higher and a freezing temperature zone of about −6 ° C. or lower. The switching chamber 7 can be set in the temperature zone.

  In addition, a cooling chamber 14 is formed at the rear rear side of the freezer compartment 4, and a cooler 22 connected to a cooling cycle for cooling the refrigerator is disposed therein, and the cold air heat-exchanged by the cooler 22 is forcibly circulated. A fan 25 is arranged.

  Above the fan 25, a damper device 17 that distributes the cold air flowing into the refrigerating chamber 2 and the switching chamber 7 is disposed.

  In each storage room, the internal temperature of the refrigerator compartment 2 is about 2 to 3 ° C, the internal temperature of the vegetable compartment 6 is about 2 to 5 ° C, and the internal temperature of the freezer compartments 3 and 4 is about -18. It can be used separately at -20 ° C and a temperature zone. Accordingly, by selecting a temperature range suitable for preservation of food and storing food, higher freshness and long-term preservation can be realized.

  Further, a plurality of shelf plates 100 divided into upper and lower stages are disposed in the refrigerator compartment 2, and a first illumination device 30 that illuminates the interior of the refrigerator compartment 2 is disposed in front of the shelf plates 100, and the first illumination device is provided. 30 embeds the inner box 13 in a partially recessed manner on the outer box 12 side. Further, the first lighting device 30 is arranged extending in the vertical direction across the plurality of shelf boards 100.

  The first lighting device 30 includes a mounting board (not shown) on which a plurality of light emitting diodes that emit wavelengths in the visible light region are mounted, and a transparent resin cover that covers the mounting board. Specifically, LEDs of light emitting elements that emit white light are used.

  A refrigerating room duct 18 is formed on the back surface of the refrigerating room 2 and through which the cold air circulated from the damper device 17 to the refrigerating room distributed to the refrigerating room. The refrigerating room duct 18 is located above the uppermost shelf 100 in the refrigerating room duct 18. The first auxiliary lighting device 31 is disposed at the position. A part of the refrigerating chamber duct 18 facing the first auxiliary lighting device 31 is composed of a light transmissive member, and is configured to indirectly illuminate the inside of the refrigerating chamber 2 by irradiating the light transmissive member.

Further, by disposing a photocatalyst in the vicinity of the first auxiliary lighting device 31, the photocatalyst has an action of sterilizing bacteria contained in the cold air flowing in the refrigerator compartment duct 18, and discharges the cold air discharged into the refrigerator compartment 2. Bacteria can be sterilized before the exit.

  Next, the configuration of the switching chamber 7 will be described.

  The switching chamber 7 has a top surface 101 made of a synthetic resin that can be used as a shelf plate whose upper surface is positioned at the lowest level of the refrigerator compartment 2, and a synthetic resin that is housed in the lower side of the top surface cover 101 so as to be drawable in the front-rear direction. A storage case 34 made of a metal and a lid 102 that can be freely opened and closed at the front opening of the upper surface cover 101 of the switching chamber 7.

  A switching chamber rear duct 103 that guides the cool air distributed by the damper device 17 to the switching chamber 7 is formed behind the storage case 34, and a switching chamber top duct 33 is disposed on the top surface of the switching chamber 7. It is connected to the downstream side of the room rear duct 103.

  The switching chamber top surface duct 33 forms a duct together with the upper surface cover 101, and a discharge port 35 that discharges cool air into the switching chamber 7 is formed at a position that is an upper surface portion of the storage case 34.

  The switching chamber 7 is provided with a second lighting device 32 for irradiating the room. The second lighting device is an inner box 13 located behind the storage case 34 and is disposed beside the switching chamber rear duct 103.

  Similarly to the first lighting device 30, the second lighting device 32 also includes a mounting board (not shown) on which a light emitting diode that emits a wavelength in the visible light region is mounted, and a transparent resin cover that covers the mounting board. It consists of The light emitting diode has a central wavelength of 400 to 500 nm, and in the case of the embodiment, a blue LED is attached as a light emitting element. Moreover, since the switching chamber 7 has a smaller space capacity than the refrigerator compartment 2, the number of blue LEDs of the second lighting device 32 attached is smaller than the number of LEDs of the first lighting device.

  The second illumination device 32 is arranged so as to irradiate from the rear to the front of the switching chamber 7. Specifically, the optical axis of the second illumination device 32 is directed toward the center of the bottom surface of the storage case 34. It is tilted downward so as to irradiate.

  A reflective member 104 that reflects the light of the second illumination device 32 is provided on the bottom surface of the storage case 34. In the embodiment, the reflecting member 104 is an aluminum plate.

  Further, the rear wall 34a constituting the storage case 34 is formed of at least a light transmissive member, and the lid 102 provided on the upper portion of the front wall 34b serving as a handle at the time of drawer is also provided as a light transmissive member. It is formed with.

  The surface of the rear wall 34a through which the second illuminating device 32 is transmitted has no uneven shape and is formed in a transparent planar shape, and the lid 102 has an uneven shape.

  The following operation | movement and effect | action are demonstrated about the refrigerator comprised as mentioned above.

  By operating the internal temperature setting operation unit 105 disposed on the surface of the refrigerator compartment door 2a, the switching chamber 7 is set to a third temperature zone (hereinafter referred to as a third temperature zone chamber), and the refrigerator compartment door 2a is set. Is opened, the first lighting device 30 that illuminates the inside of the refrigerator compartment 2 is turned on, and at the same time, the second lighting device 32 that illuminates the third temperature zone chamber 7 is turned on. When the refrigerator compartment door 2a is closed, the first lighting device 30 and the second lighting device 32 are turned off.

  The first lighting device 30 illuminates the stored items placed on the shelf boards 100 of the refrigerator compartment 2 from the front with white LEDs, and the second lighting device 32 enters the third temperature zone chamber 7 with the blue LEDs. The stored items are illuminated from the rear to the front. When the user stands in front of the refrigerator 1 and opens the refrigerator compartment door 2a, the shelf 100 is generally located at the height of the line of sight, and the switching room 7 is disposed at a position lower than the line of sight. .

  For this reason, when the 1st illumination device 30 irradiates toward the back from the front of the shelf board 100, it can prevent that the optical axis of the light emitted light enters into eyes, and can reduce glare. Further, since the second lighting device 32 is at a low position, direct light does not enter the eyes even when illuminated from the rear to the front, and the switching chamber 7 is located at a position lower than the line of sight. In addition, the interior of the switching chamber 7 cannot be seen through the upper surface cover 101 because it is insulated from the refrigerating chamber 2 space, and the switching chamber 7 is set as the third temperature zone chamber by irradiating from the back side to the front side. This can be improved visually.

  Further, the second lighting device 32 is disposed in the vicinity of the switching chamber rear duct 103 so that the optical axis of the light is directed to the center of the bottom surface of the storage case 34, and further, a reflective member is provided on the bottom surface of the storage case 34. By disposing an aluminum plate 104, the light from the second lighting device 32 can be reflected by the aluminum plate 104, and visibility can be ensured even when a large amount of storage items are stored in the storage case 34. it can. Further, if the aluminum plate 104 is provided with a concavo-convex shape, the visibility can be further improved by reflection and diffusion action.

  Further, by forming at least the rear wall 34a of the storage case 34 facing the second lighting device 32 with a flat transparent member, the transparency of the blue LED into the storage case 34 is enhanced, and the lid 102 has an uneven shape. By providing, it is possible to perform diffusion in the surface direction of the lid body 102, and when the user looks at the switching chamber 7, the front lid body 102 is reduced from being locally irradiated with blue. Since the entire surface of the lid 102 is diffused in blue and can be visually recognized, the third temperature zone is set, and it can be appealed that the temperature is different from the temperature zone of the refrigerator compartment 2.

  Even when the storage case 34 is pulled forward, the second illumination device 32 irradiates from behind, so that the storage case 34 can be irradiated even when the storage case 34 is pulled out. For this reason, when the switching chamber 7 is set to the third temperature zone chamber, the storage case 34 is pulled forward from the opening of the refrigerator compartment door 2a, and the storage case 34 is pulled in and out. The inside of the storage case 34 is continuously irradiated until light is returned to the position and the refrigerator compartment door 2a is closed, and light is transmitted through the storage case 34. Therefore, even if the user releases his eyes halfway, Since the inside of the storage case 34 is irradiated in the entering direction, the visibility can be continuously maintained.

  In the present embodiment, the switching room 7 and the second lighting device 32 with a built-in refrigeration room, from the installation position of the switching room 7, when the refrigerator user opens the door of the storage room, Reduces the possibility of light entering the eyes and feeling uncomfortable glare.

  Further, in the present embodiment, both sides and front and rear sides of the inner and lower portions of the storage container 34 in a state where the switching chamber 7 is pulled out by the lighting device 32 using one semiconductor light emitting element as a light source in the switching chamber 7. Since it is possible to sufficiently illuminate the area to be illuminated inside the storage container 34 up to the side, not only can the visibility of the food stored in the switching chamber 7 be improved, but the user-friendly refrigerator 1 can be obtained. Since the illuminating device 32 uses one semiconductor light emitting element as a light source, the refrigeration efficiency can be improved by suppressing the amount of heat generated during light emission, and it can be manufactured at low cost.

Further, in addition to the second lighting device 32 having high rectilinearity, the storage case 34 using a highly reflective white synthetic resin material that does not transmit the side wall reflects the illumination light into the switching chamber 7. Can do. Accordingly, it is possible to make it easy to see the dirt in the corners in the switching chamber 7 and to see what is stored in the back of the switching chamber 7. This makes it possible to check whether a stored item has been forgotten or corrupted.

  Further, since the side wall of the switching chamber 7 is formed of a white synthetic resin material that does not transmit light in order to insulate from the refrigerator compartment 2, it is possible to make the side wall a heat insulating side wall, and to prevent condensation on the side wall. Can be prevented.

  Moreover, in this Embodiment, the light of the illumination of the switching chamber 7 is scattered in the refrigerator compartment 2 by providing a heat insulating material in the top | upper surface of the switching chamber 7, suppresses leak light, and switches efficiently. Only 7 can be illuminated.

  As a result, it is possible to irradiate the inside of the storage case 34 evenly, and it becomes easy for the user to look around the stored items such as food in the refrigerator 1 and the food can be taken in and out quickly, thereby suppressing the leakage of cold air due to the door opening. In addition to improving the freshness and suppressing the deterioration of the food, an energy saving effect can be obtained.

  Further, when the switching chamber 7 is set to a temperature other than the third temperature zone, for example, a chilled setting by the internal temperature setting operation unit 105, the chilled setting is a temperature zone of 0 ° C. or higher. When opened, the first lighting device 30 is turned on, but the second lighting device 32 is turned off, and the user is visually informed that the switching chamber 7 is set to the chilled temperature zone setting. can do.

  In the present embodiment, a light source having a notification function for notifying the user of the environment in the storage room is provided in a visually easy-to-understand manner, so that food stored in the switching room 7 by the refrigerator user can be taken in and out. When the switching chamber 7 is set to the third temperature zone or the chilled temperature zone, the light emitting unit is energized and the light emitting element is turned on. Depending on whether the light source is on or off, the refrigerator user can visually recognize it, and it can prevent the temperature rise in the switching room and improve the storage performance. A good refrigerator 1 can be provided.

  Further, in the present embodiment, the second illumination device 32 is provided with a notification function for notifying the user of the environment in the storage room in an easy-to-understand manner by using illumination light having a color in the visible region. Furthermore, since adverse effects such as the human body and resin deterioration are eliminated, versatility is greatly improved.

  In addition, blue light with a wavelength in the range of 400 nm to 500 nm tends to be static / cold / sedated, and preserves fresh foods such as fish and meat in a compartment with a cool lighting. By doing so, it can be impressed that it is a space with higher freshness.

  Further, in the present embodiment, the blue illumination light of the second illumination device 32 and the visible light responsive catalyst in the irradiation range in the vicinity of the second illumination device 32 are used in combination. It promotes the chemical reaction of the components inside and generates oxidizing substances. Thereby, sterilization and suppression of mold and virus can be promoted. In addition, the effect obtained when the second illumination 32 is used in combination with the blue illumination light and the visible light responsive catalyst also makes it possible to improve the deodorization performance. Organic substances (such as ammonia, acetaldehyde, methyl mercaptan, hydrogen sulfide, formaldehyde, ethylene, and other organic compound molecules) in the cool air circulating in the refrigerator 1 are adsorbed and collected on the adsorbent of the catalyst, and the light from the light source Energy can give the ability to decompose organic matter.

Further, as shown in FIG. 4, a plurality of discharge ports 35 are provided in the switching chamber top duct 33 with a built-in refrigerator compartment according to the embodiment, and an aluminum plate 104 as a reflecting member is disposed on the bottom surface portion. Therefore, the reflection of light into the switching chamber 7 and the cooling air from the discharge port 35 are further enhanced by the aluminum plate 104, the temperature distribution of the switching chamber 7 is made uniform, the low temperature preservation is improved, and the cooling effect is also achieved. Can be improved.

  In the present embodiment, when the switching chamber 7 is set to the third temperature zone, it is necessary for the refrigerator user to recognize that the freshness of the stored food is uniform. . This is because, compared with the refrigerator compartment 2, it is used in this temperature range to store fresh foods deliciously, keeping freshness, and not freezing too much.

  For example, sashimi, sliced meat, and other foods that would be a problem if frozen too much. Preservation without over-freezing refers to the micro-frozen state that can be cut with a kitchen knife, and the refrigerator consumers can feel the freshness and safety of food after storage for several days to a week. , Become an indicator. Therefore, making the temperature distribution in the switching chamber 7 uniform takes into account not only the taste of food but also the hygiene.

  In the present embodiment, setting the switching chamber 7 to the third temperature zone and keeping the food in a slightly frozen state is thawing during cooking, as compared to storing the food in the freezer. Save time and effort. Therefore, the 3rd temperature zone room | chamber can implement | achieve the user-friendly refrigerator 1 closely_contact | adhered to the life of the refrigerator consumer.

  Further, although the storage room 7 is a switching room, it may be a room set only in the third temperature zone. In this case, it is always turned on when the refrigerator compartment door 2a is opened and is not in the refrigerator temperature zone. Can be enlightened.

  Although the second lighting device 32 is a blue LED, an LED that emits a wavelength in another visible light region may be attached. If the LED has a wavelength different from that of the first lighting device 30, the LED is visually Visibility can be improved.

  As described above, the refrigerator according to the present invention uses the refrigerator by providing the third temperature zone chamber (a temperature between the freezing temperature and the refrigeration temperature) in the refrigeration chamber and disposing the illumination light source therein. When a person puts in or out food stored in a switching room in a refrigerated room, it is possible to visually recognize the temperature environment in the warehouse by the presence or absence of lighting, Since it is possible to reduce unnecessary opening and closing of the switching room and to prevent the temperature inside the refrigerator from rising, and to improve the freshness performance, it can be applied to household or commercial equipment. It can be used to improve the storage stability of cases, cooler boxes, and commercial refrigerators.

DESCRIPTION OF SYMBOLS 1 Refrigerator 2 Refrigeration room 3 Freezing room 4 Freezing room 5 Ice making room 6 Vegetable room 7 Switching room 30 1st lighting device 32 2nd lighting device 33 Switching room top surface duct 34 Storage case 34a Rear wall 34b Front wall 35 Outlet 100 Shelf plate 101 Top cover 102 Lid 103 Switching room rear duct

Claims (4)

A refrigerator main body formed of heat insulating walls, a refrigerating room provided in the upper part of the refrigerator main body, a storage room partitioned in the lower part of the refrigerating room, a first lighting device for irradiating the refrigerating room, and the storage room In the refrigerator including the second lighting device that irradiates the storage room, the storage room can be set to a third temperature zone in which the temperature between the refrigeration temperature zone and the freezing temperature zone can be set. When the temperature zone is set and the refrigerator door is opened, both the first lighting device and the second lighting device are turned on, and the emission color emitted by the second lighting device is the first color. A refrigerator characterized by being different from the luminescent color emitted by the lighting device. A storage case having a wall surface that is arranged so as to be able to be pulled out in the storage chamber and has light permeability, and a rear wall disposed behind the storage case includes the second lighting device, and the second lighting device is located on the back side. The refrigerator according to claim 1, wherein the inside of the storage case can be irradiated even when the storage case is irradiated toward the front side and the storage case is pulled out toward the front. The refrigerator according to claim 1, wherein a reflection member that reflects light is disposed in the storage chamber. The first illumination device and the second illumination device are illumination devices each including a light emitting element that emits a wavelength in a visible light region, and the light emitting element of the second illumination device is within a range of 400 nm to 500 nm. The refrigerator according to any one of claims 1 to 3, wherein the refrigerator has a central wavelength.