JP2014156983A - Refrigerator and lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator provided with a lighting device which suppresses increase of a manufacturing cost and enlargement of size and, moreover, can reduce unevenness of lighting, and to provide the lighting device which suppresses the increase of a manufacturing cost and the enlargement of size and, moreover, can reduce the unevenness of lighting.SOLUTION: A refrigerator includes a refrigeration room 2 of which the front surface is opened and a lighting device 20 which is attached to an inner wall surface of the refrigeration room 2 and lights up the interior of the refrigeration room 2. Therein, the lighting device 20 includes a lighting light source 21, a transparent lighting cover which allows the light emission surface side of the lighting light source 21 to be covered therewith and forms a housing space of the lighting light source 21 on an inner part, a diffusion sheet which is disposed between the lighting cover and the lighting light source 21 and is subjected to such a print as to diffuse light emitted from the lighting light source 21 and a sheet retention part which brings the surface of the diffusion sheet into contact with an inner surface of the lighting cover and retains the diffusion sheet, and the diffusion sheet is subjected to the print which is different in accordance with a positional relation with the lighting light source 21.

Description

  The present invention relates to a refrigerator including a lighting device and a lighting device.

  For example, in a storage room having a relatively large internal volume, such as a refrigeration room provided in a household refrigerator, there are some provided with a plurality of shelves that partition the storage room in order to increase storage efficiency.

  Such a refrigerator is provided with a lighting device that illuminates the storage chamber on the ceiling, the back surface, the side surface, and the like of the storage chamber in order to improve the visibility of the food when the user puts the food in and out.

  In recent years, reduction of power consumption of home appliances has become a user's need, and energy-saving refrigerators using light emitting diodes (LEDs) as light sources for lighting in storage rooms are increasing.

  However, LED lighting has a strong directivity of light compared to a conventional light bulb or the like. For this reason, when light is not sufficiently diffused, there is a problem that the illuminance in the warehouse is uneven.

  Therefore, it has been proposed that the synthetic resin plate constituting the transparent cover covering the illumination light source has a “structure in which the transparent synthetic resin plate itself having a thickness of about 1 to 5 mm diffuses or diffusely reflects light” (for example, Patent Document 1).

  In addition, it has been proposed to perform “roughening treatment such as sandblasting and polishing” on a transparent cover made of a resin material and covering an illumination light source (see, for example, Patent Document 2).

JP 2000-237011 A (page 3) JP 2010-170847 A (page 9)

  However, if processing for diffusing light is added to the lighting cover itself, processing and molding will be costly and time consuming.

  Furthermore, unless a sufficient distance is provided between the illumination cover and the illumination light source, the effect of the shape (diffusion shape) provided on the illumination cover for light diffusion is also diminished. In addition, when a diffusing shape is provided on the illumination cover, there is a problem that light interference occurs and shadows and light unevenness are generated.

  On the other hand, if the distance between the illumination light source and the illumination cover is increased, there is a concern about adverse effects on the design, food storage capacity, and ease of storage due to the projection of the illumination cover on the storage room side. On the heat insulating material side of the room, there is a concern about the deterioration of performance and power consumption due to the thin heat insulating material.

  For example, in recent refrigerator-freezers for home use, it is a mainstream to mount a vacuum heat insulating material in a urethane foam heat insulating material. However, when filling the periphery of the vacuum heat insulating material with urethane foam heat insulating material, the gap between the vacuum heat insulating material and the outer box sheet metal, and the vacuum heat insulating material and the inner box is required to be about 8 mm or more. Otherwise, there is a problem that the urethane foam heat insulating material cannot be sufficiently filled.

  When the illumination light source is moved toward the heat insulating material while securing a space for filling the urethane foam heat insulating material, the thickness of the heat insulating material portion increases, and the ratio of the storage volume of the storage room to the volume of the refrigerator-freezer becomes small. There is a problem that the storage space for food is reduced and user convenience is reduced.

  In many cases, the illumination cover is formed of a transparent resin product and is manufactured using a mold. Therefore, when the diffusibility is insufficient after molding, there is also a problem that it takes a lot of time and cost to correct it.

  The present invention has been made against the background of the above problems, and provides a refrigerator including an illumination device that can suppress unevenness in illumination by suppressing an increase in manufacturing cost and an increase in size. It is another object of the present invention to provide an illumination device that can suppress unevenness in illumination by suppressing an increase in manufacturing cost and an increase in size.

  A refrigerator according to the present invention includes a storage chamber having an open front surface, and an illumination device that is attached to an inner wall surface of the storage chamber and that illuminates the storage chamber. The illumination device includes an illumination light source and the illumination light source. A transparent illumination cover that covers the light emitting surface side and forms a storage space for the illumination light source therein, and printing that is provided between the illumination cover and the illumination light source and diffuses light emitted from the illumination light source. A diffusion holding sheet, and a sheet holding portion for holding the diffusion sheet by bringing the surface of the diffusion sheet into contact with the inner surface of the illumination cover, and the diffusion sheet has a positional relationship with the illumination light source. The different printing is applied accordingly.

  According to the present invention, unevenness in illumination can be reduced by adjusting the printing applied to the diffusion sheet. Moreover, compared with the case where the process which diffuses light is provided in a lighting cover, the enlargement of a illuminating device and manufacturing cost can be suppressed.

It is a schematic front view of the refrigerator-freezer which concerns on embodiment. It is a perspective view of the refrigerator compartment which concerns on embodiment. It is a schematic sectional drawing of the refrigerator compartment which concerns on embodiment. It is a schematic sectional drawing explaining the structure of the illuminating device which concerns on embodiment. It is a schematic sectional drawing of the principal part of the refrigerator compartment explaining the positional relationship of the illuminating device which concerns on embodiment, and an upper shelf board. It is front sectional drawing of the illumination cover and diffusion sheet which concern on embodiment. FIG. 7 is an enlarged view of a portion X in FIG. 6. It is a front view of the illumination cover and diffusion sheet which concern on embodiment. It is a figure which shows an example of the directional characteristic of a light emitting diode. It is a figure explaining the measuring method of the directional characteristic of a light emitting diode. It is a schematic sectional drawing of the illuminating device which concerns on a comparative example.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment in which a refrigerator and a lighting device according to the present invention are applied to a domestic refrigerator-freezer will be described with reference to the drawings. In addition, this invention is not limited by the form of drawing shown below. Further, in the following description, terms for indicating directions (for example, “up”, “down”, “right”, “left”, “front”, “back”, etc.) are used as appropriate for easy understanding. This is for explanation and these terms do not limit the present invention. In addition, the dimensions, materials, shapes, configurations, and relative arrangements of the components described in the embodiments are not intended to limit the scope of the present invention to the description unless otherwise specified. Only.

Embodiment.
[Overall configuration of refrigerator]
FIG. 1 is a schematic front view of a refrigerator-freezer according to an embodiment. The refrigerator-freezer 100 has a main body 1 whose front opening is covered with a door so as to be freely opened and closed, and the inside of the main body 1 is partitioned into a plurality of storage rooms in different temperature zones. The refrigerator-freezer 100 of the present embodiment is provided with a refrigerator compartment 2 provided with a refrigerator compartment left door 2a and a refrigerator compartment right door 2b, an ice making compartment 3 provided with an ice compartment door 3a, and a switching compartment door 4a. A switching room 4, a freezing room 5 provided with a freezing room door 5a, and a vegetable room 6 provided with a vegetable room door 6a. The refrigerator compartment 2 is provided in the uppermost stage of the refrigerator-freezer 100, and is a storage room having the largest internal volume among the plurality of storage rooms. In the following description, when referring to the front-rear direction of the storage room, the side facing the user who puts in and out the stored food such as food is referred to as “front”, and the side facing the opening of the storage room is referred to as “rear”. ".

[Configuration of refrigerated room]
FIG. 2 is a perspective view of the refrigerator compartment according to the embodiment. FIG. 3 is a schematic cross-sectional view of the refrigerator compartment according to the embodiment. 2 and 3 show a state in which the refrigerator compartment left door 2a and the refrigerator compartment right door 2b are removed. The main body 1 has a sheet metal outer box 7 that constitutes an outline of the main body 1, a synthetic resin inner box 8, and a heat insulating material provided between the outer box 7 and the inner box 8. As shown in FIG. 3, the heat insulating material of the present embodiment includes a vacuum heat insulating material 9 and a urethane foam heat insulating material 10 filled around the vacuum heat insulating material 9.

  As shown in FIGS. 2 and 3, the refrigerator compartment 2 is provided with a plurality of shelves that partition the space in the refrigerator compartment 2 in the vertical direction. In the present embodiment, an upper shelf board 11, a middle shelf board 12, and a lower shelf board 13 are provided in order from the top. The upper shelf board 11, the middle shelf board 12, and the lower shelf board 13 (sometimes collectively referred to as “shelf board” in the present embodiment) are made of, for example, a synthetic resin material that is transparent or translucent and transmits light. ing. The user can place stored items such as food on the upper shelf board 11, the middle shelf board 12, and the lower shelf board 13.

  An illuminating device 20 that illuminates the refrigerator compartment 2 is provided between the upper shelf 11 located at the uppermost stage among the shelf boards provided in the refrigerator compartment 2 and the ceiling surface of the refrigerator compartment 2. In the present embodiment, the lighting device 20 is attached to the ceiling surface of the refrigerator compartment 2, and the interior of the refrigerator compartment 2 is illuminated from above so as to illuminate a stored item such as food placed on the upper shelf 11. To emit light. The illuminating device 20 has a horizontally long shape as a whole, and is attached so that its longitudinal direction is along the width direction of the refrigerator compartment 2. Moreover, in this Embodiment, the illuminating device 20 is attached to the near side rather than the center in the depth direction of the refrigerator compartment 2. As shown in FIG. The illumination light source 21 of the present embodiment is provided at a position closer to the back side than the front edge of the upper shelf board 11. A plurality of light sources (illumination light sources 21 to be described later) are provided along the longitudinal direction inside the illumination device 20, and the light sources are covered with an illumination cover 22.

[Lighting device]
FIG. 4 is a schematic cross-sectional view illustrating the structure of the illumination device according to the embodiment. The illumination device 20 includes an illumination light source 21, an illumination cover 22 that covers the light emitting surface side of the illumination light source 21, a fixing base 23 that attaches the illumination device 20 to the inner wall surface of the refrigerator compartment 2, and the illumination light source 21 and the illumination cover 22. And a diffusion sheet 26 provided therebetween.

  The illumination light source 21 is composed of LEDs (light emitting elements), and a plurality of illumination light sources 21 are mounted on a substrate. The illumination light source 21 mounted on the substrate is attached to the fixed base 23 via the light source support 24. The illumination light source 21 has its light emitting surface facing downward, and emits light generally downward.

  The illumination cover 22 forms a storage space for storing the illumination light source 21 therein and covers the light emitting surface of the illumination light source 21. The illumination cover 22 is provided on the side facing the light emitting surface of the illumination light source 21 (the lower side of the illumination light source 21 in the present embodiment), covers the illumination light source 21 from below and the illumination light source between the fixed base 23. 21 is stored. The illumination cover 22 is made of a transparent synthetic resin material that transmits light. The inner surface and the outer surface of the lighting cover 22 are flat surfaces. The illumination cover 22 is attached to the fixed base 23 via an illumination cover holding part 25 made of a locking claw formed on the fixed base 23.

  The diffusion sheet 26 is attached to the inner surface of the illumination cover 22, that is, the surface facing the light emitting surface of the illumination light source 21. The diffusion sheet 26 has a function of reducing the directivity of light emitted from the illumination light source 21 and realizing surface emission such as a fluorescent lamp. For example, the diffusion sheet 26 is produced by performing printing that diffuses light with an ink having a property of reflecting, absorbing, or scattering light on one or both sides of a transparent sheet having a thickness of about 0.2 mm to 1 mm. Can do. The light diffusion state of the diffusion sheet 26 can be adjusted by adjusting the printing pattern (printed pattern) applied to the diffusion sheet 26 and the ink density. Further, by performing double-sided printing that diffuses light on the diffusion sheet 26, light is diffused with higher efficiency than single-sided printing. As a material of the sheet itself of the diffusion sheet 26, a resin material having high transparency, for example, PC (polycarbonate), PET (polyethylene terephthalate), or the like can be used. A diffusion member (diffusion ink) having a different concentration or particle roughness according to a desired diffusion concentration is applied to the diffusion sheet 26 in a band shape, for example. The diffusion member (diffusion ink) applied to the diffusion sheet 26 should be randomly arranged without a specific pattern in order to suppress interference fringes and polarization in an application range having the same concentration or particle roughness. preferable.

  Here, the directivity characteristic of the illumination light source 21 using a light emitting diode will be described. FIG. 9 is a diagram illustrating an example of directivity characteristics of a light emitting diode. As shown in FIG. 9, generally, in a light emitting diode, light (optical axis) emitted in a direction perpendicular to the light emitting diode has the maximum intensity. When the illuminance characteristic of the light emitting diode is not known, the directional characteristic can be measured by measuring the illuminance of the light emitting diode as shown in FIG. FIG. 10 is a diagram for explaining a method for measuring the directivity of a light emitting diode. As shown in FIG. 10, the illuminance measuring device 30 is arranged at a position at a certain distance L from the illumination light source 21 using the light emitting diode, and the illuminance measuring device 30 measures the illuminance. The illuminance measuring device 30 measures the illuminance at a plurality of positions along the circumference of the radius L with the illumination light source 21 as the center. By measuring the illuminance as described above, the luminous intensity on the optical axis of the illumination light source 21 is set to 100%, and the illuminance at each angle formed by the illuminance measuring instrument 30 and the illumination light source 21 follows the example of FIG. Can be shown. As shown in FIG. 9, light emitted from a light emitting diode generally has a property of high straightness.

  FIG. 5 is a schematic cross-sectional view of the main part of the refrigerator compartment for explaining the positional relationship between the lighting device and the upper shelf board according to the embodiment. In FIG. 5, the optical axis of the illumination light source 21 according to the present embodiment is denoted by reference numeral 60, and the irradiation range of the illumination light source 21 is also illustrated. In FIG. 5, the light emitted from the illumination light source 21 is taken as an example of the case where the illumination light source 21 having the directivity shown in FIG. 9 is used, from the positional relationship between the illumination light source 21 and the upper shelf 11. , Five ranges, range A to range E, are defined. In FIG. 5, the right side of the paper is the front side (door side) of the refrigerator compartment 2, and the left side of the paper is the back side.

  The range A is a range from a line 62 inclined 60 ° to the back side from the optical axis 60 of the illumination light source 21 to a line 61 inclined 80 ° from the optical axis 60 to the back side. Since the line 61 is also a line connecting the illumination light source 21 and the rear edge of the upper shelf 11, and the line 62 is also a line defining the rear end of the illumination range of the illumination light source 21, the range A is the illumination light source. It can be said that this is the range from the rear end of the illumination range 21 to the rear end of the upper shelf 11.

  The range B is a range from the optical axis 60 of the illumination light source 21 to a line 62 inclined by 60 ° from the optical axis 60 to the back side.

  A range C is a range from the optical axis 60 of the illumination light source 21 to a line 63 connecting the illumination light source 21 and the front edge of the upper shelf 11.

  The range D is a range from a line 63 connecting the illumination light source 21 and the front edge of the upper shelf 11 to a line 64 inclined 60 ° from the optical axis 60 to the front side.

  The range E is a range from a line 64 tilted 60 ° to the front side from the optical axis 60 of the illumination light source 21 to a line 65 tilted 80 ° from the optical axis 60 to the front side.

  In the range D and the range E, the user who opened the door of the refrigerator compartment 2 can see the illumination light source 21 directly. In the range A, the intensity of light emitted from the illumination light source 21 is 50% or less of the optical axis, so that the visibility of food is lowered and the user feels the back side of the refrigerator compartment 2 dark. .

  Therefore, in the present embodiment, the diffusion sheet 26 has a size that can emit light in a range from the range A to the range E. By doing in this way, the diffusion of light in the range A can be realized, the illuminance can be ensured to the rear of the upper shelf 11, the darkness felt by the user can be improved and the visibility can be improved. it can. Moreover, in the range D and the range E, since the light from the range B and the range C is diffused by the diffusion sheet 26, it can suppress making a user feel unpleasant with glare. In addition, by limiting the size of the diffusion sheet 26 to a size that allows light to be emitted from the range A to the range E, the member cost of the diffusion sheet 26 can be reduced.

  The diffusion pattern and diffusion density of the diffusion sheet 26 mounted on the illumination device 20 can be determined by the positional relationship between the illumination light source 21 and the diffusion sheet 26 and the positional relationship between the illumination light source and the shelf. In general, in the illumination light source 21 using a light emitting diode, light (optical axis) emitted in a direction perpendicular to the illumination light source 21 has the maximum intensity, as shown in FIG.

  For this reason, the pattern and density of the diffusion printing applied to the diffusion sheet 26 are adjusted for the purpose of realizing illumination with uniform illuminance while eliminating the discomfort due to the glare felt by the user. Specifically, for example, in a region intersecting with the light from the illumination light source 21 that proceeds in a direction inclined toward the front opening side of the refrigerator compartment 2 with respect to the optical axis, rather than the diffusion density of the region intersecting with the optical axis of the illumination light source 21. Diffusion printing is performed so that the diffusion density becomes smaller. The diffusion concentration can be adjusted stepwise or steplessly so that the diffusion concentration in the region intersecting the optical axis of the illumination light source 21 is maximized and the diffusion concentration decreases toward the front opening side of the refrigerator compartment 2. By doing so, the diffusion of strong light in the direction of the optical axis of the illumination light source 21 is strengthened, and the diffusion density is lowered and the transparency is maintained in the region where the illuminance is relatively low. Can be made more uniform.

  Also, in the back direction in the refrigerator compartment 2, the diffusion density of the diffusion sheet 26 on the optical axis is set to 100%, and the diffusion density is lowered according to the illuminance characteristics, thereby strengthening the strong light diffusion just below the optical axis. In addition, the interior can be illuminated uniformly by maintaining transparency at an angle at which light is weakened.

  Instead of adjusting the diffusion density with monotonous gradation, the diffusion density of the diffusion sheet 26 on the optical axis is assumed to be 100%, and the diffusion density of the diffusion sheet 26 is also set to 60% at an angle corresponding to 60% illuminance. Good. By doing in this way, while being able to suppress the glare which a user feels, illumination unevenness can be suppressed, Therefore The design property of the external appearance of the illuminating device 20 is also improved.

Next, a structure for attaching the diffusion sheet 26 to the illumination cover 22 will be described.
FIG. 6 is a front sectional view of the illumination cover and the diffusion sheet according to the embodiment. FIG. 7 is an enlarged view of a portion X in FIG.
The diffusion sheet 26 of the present embodiment is attached to the lighting cover 22 such that the surface thereof is in contact with the inner surface of the lighting cover 22. The diffusion sheet 26 is attached to the illumination cover 22 with a holding structure or a locking structure without using an adhesive substance. In the present embodiment, a sheet holding portion 27 that holds the diffusion sheet 26 by bringing the surface of the diffusion sheet 26 into contact with the inner surface of the lighting cover 22 is provided inside the lighting cover 22. The sheet holding unit 27 is a claw or a rib protruding from the inner surface of the lighting cover 22. The diffusion sheet 26 is inserted into the claws or ribs of the sheet holding unit 27, and the diffusion sheet 26 is held between the sheet holding unit 27 and the inner surface of the illumination cover 22.

  By providing such a sheet holding portion 27, the diffusion sheet 26 can be attached to the lighting cover 22 without using an adhesive substance such as a double-sided tape or glue. Since the adhesive substance is not used for fixing the diffusion sheet 26 to the lighting cover 22, the material cost of the adhesive member, the operation cost of attaching the adhesive member, and the defective rate of incorrect attachment can be suppressed. In addition, when an adhesive substance is used for attaching the diffusion sheet 26, paste marks and bubbles may be generated in the lighting cover 22 made of a transparent material that transmits light, and the appearance may deteriorate. According to the embodiment, such a situation does not occur, and the appearance of the lighting device 20 is good. In addition, when an adhesive substance is used to attach the diffusion sheet 26, unevenness in the appearance of light may occur due to variations in the thickness of the air layer between the diffusion sheet 26 and the illumination cover 22. According to the present embodiment, it is possible to reduce such unevenness in the appearance of light.

  The specific configuration of the sheet holding unit 27 shown in FIGS. 6 and 7 is an example, and other holding structures or locking structures that do not use an adhesive substance can be employed. For example, a claw protruding from the inner surface of the illumination cover 22 may be provided, and a part of the diffusion sheet 26 may be locked between the tip of the claw and the inner surface of the illumination cover 22. Further, a small hole may be provided in the diffusion sheet 26, and a locking claw that is inserted into the small hole and formed with a retaining protrusion from the small hole may be provided on the inner surface of the illumination cover 22.

  FIG. 8 is a front view of the illumination cover and the diffusion sheet according to the embodiment. When viewed from the front, the illumination cover 22 and the diffusion sheet 26 have a round shape in which both end portions in the longitudinal direction warp upward from the center portion. Thus, although both the illumination cover 22 and the diffusion sheet 26 are round, the curvatures are different, and the curvature of the diffusion sheet 26 is smaller than the curvature of the illumination cover 22. When the diffusion sheet 26 is not attached to the lighting cover 22, the curvatures of the two are different. However, when the diffusion sheet 26 is attached to the inner surface of the lighting cover 22, the diffusion sheet 26 is pressed against the inner surface of the lighting cover 22 and closely contacts. And generation | occurrence | production of the clearance gap between both can be suppressed. The difference in curvature between the diffusion sheet 26 and the illumination cover 22 is determined in consideration of these molding variations. For example, even when the illumination cover 22 is warped due to molding variations, the illumination cover 22 and the diffusion sheet 26 are obtained. The generation | occurrence | production of the clearance gap between can be suppressed. Since generation | occurrence | production of the clearance gap between the diffusion sheet 26 and the illumination cover 22 can be suppressed, the dispersion | variation in the spreading | diffusion of light and the diffusion failure by a clearance gap being produced can be suppressed, and it leads to reduction of manufacturing cost. When printing is performed on both sides of the diffusion sheet 26, light can be diffused with higher efficiency than with single-sided printing. However, by using no adhesive substance to attach the diffusion sheet 26, the highly efficient diffusion effect can be achieved. Can be maintained without damage.

  As described above, according to the present embodiment, the diffusion sheet 26 that diffuses the light from the illumination light source 21 is provided between the illumination cover 22 and the illumination light source 21. The diffusion sheet 26 was subjected to different diffusion printing depending on the positional relationship with the illumination light source 21. For this reason, the illuminating device 20 which can closely approximate the illumination in the refrigerator compartment 2 can be obtained.

  FIG. 11 is a schematic cross-sectional view of a lighting device according to a comparative example. In FIG. 11, for convenience of explanation, the same reference numerals are given to the components corresponding to the present embodiment. As shown in FIG. 11, conventionally, there has been proposed a technique in which the inner surface of the illumination cover 22 is subjected to a graining process or the like to add unevenness 31 to diffuse light. However, the processing of the irregularities 31 and the molding of the lighting cover 22 are expensive and time consuming, and molding problems such as welds, flow marks, or sink marks may occur. However, in the present embodiment, since the inner surface of the lighting cover 22 is not provided with irregularities and is flat, defects related to the molding of the lighting cover 22 can be reduced, and the cost required for manufacturing the lighting cover 22. And time can be reduced. Even if the specification change related to the illumination in the refrigerator compartment 2 occurs, according to the present embodiment, it is possible to cope with the printing change of the diffusion sheet 26 and the replacement of the diffusion sheet 26. When changing the shape of the unevenness 31 of the illumination cover 22 as shown in FIG. 11, it is necessary to remake the mold, and the development cost and the development period increase. According to this embodiment, the illumination of FIG. The manufacturing cost can be suppressed by reducing the development cost and the development period compared to the device. Further, in the development of the lighting device 20 in the refrigerator compartment 2, a plurality of diffusion sheets 26 having different printing patterns and printing densities for diffusing light are prepared, and the actual lighting state can be changed by replacing them. Since this can be confirmed, rework related to development can be greatly reduced.

  Moreover, when providing the unevenness | corrugation 31 in the illumination cover 22 as shown in a comparative example, in order to acquire a diffusion effect, it is necessary to ensure the distance of the illumination light source 21 and the illumination cover 22, and thereby the illuminating device 20 is large sized. In some cases, the storage space in the refrigerator compartment 2 and the storage space for the heat insulating material are pressed. However, according to the present embodiment, since the light diffusion density can be controlled by adjusting the printing applied to the diffusion sheet 26, the illumination device 20 can be made smaller than the comparative example. Therefore, the design of the lighting device 20 can be improved, and the storage space can be expanded in the refrigerator compartment 2 to improve the user's convenience, and the storage space for the heat insulating material is secured and desired. Therefore, an increase in power consumption of the refrigerator / freezer 100 can be suppressed.

  Further, in the illumination cover 22 formed by molding synthetic resin, it is difficult to form the unevenness 31 such as gradation or three-dimensional expression, but printing of gradation or three-dimensional expression is relatively easily performed on the diffusion sheet 26. be able to. Therefore, a special visual effect of illumination can be obtained, and the design of the illumination device 20 can be improved.

  In addition, although the example which attached the illuminating device 20 to the ceiling surface of the refrigerator compartment 2 was shown in the said description, the attachment position of the illuminating device 20 is not limited to a ceiling surface, One of the inner wall surfaces of a storage room (ceiling surface) The lighting device 20 can be attached to any one of the back surface, the side surface, and the bottom surface. Further, the number of lighting devices 20 provided in the storage room is not limited to one, and a plurality of lighting devices 20 may be attached to one storage room. The diffusion pattern and diffusion density provided on the diffusion sheet 26 can be determined based on the directivity characteristics of the illumination light source 21 and the positional relationship between the illumination light source 21 and the shelf board, following the example shown in FIG.

Moreover, although the example which provided the illuminating device 20 in the refrigerator compartment 2 was demonstrated in the said description, you may provide the illuminating device 20 in any storage chamber in a refrigerator.
Moreover, although the example which applied the illuminating device 20 to the refrigerator-freezer 100 was shown in the said description, the illuminating device 20 can also be applied to illumination of arbitrary spaces (for example, a room, the inside of a housing | casing).

  1 body, 2 refrigerator compartment, 2a refrigerator compartment left door, 2b refrigerator compartment right door, 3 ice making room, 3a ice making room door, 4 switching room, 4a switching room door, 5 freezing room, 5a freezing room door, 6 vegetable room, 6a Vegetable room door, 7 outer box, 8 inner box, 9 vacuum heat insulating material, 10 urethane foam heat insulating material, 11 upper shelf board, 12 middle shelf board, 13 lower shelf board, 20 illumination device, 21 illumination light source, 22 illumination cover , 23 Fixing base, 24 Light source support part, 25 Illumination cover holding part, 26 Diffusion sheet, 27 Sheet holding part, 30 Illuminance measuring instrument, 31 Concavity and convexity, 100 Refrigerator.

Claims (9)

A storage room with an open front;
An illumination device attached to an inner wall surface of the storage room and illuminating the storage room;
The lighting device includes:
An illumination light source;
A transparent illumination cover that covers a light emitting surface side of the illumination light source and forms a storage space for the illumination light source therein;
A diffusion sheet provided between the illumination cover and the illumination light source and subjected to printing for diffusing the light emitted from the illumination light source;
A sheet holding unit for holding the diffusion sheet by bringing the surface of the diffusion sheet into contact with the inner surface of the lighting cover;
The said diffusion sheet is given the said different printing according to the positional relationship with the said illumination light source. The refrigerator characterized by the above-mentioned. The refrigerator according to claim 1, wherein the sheet holding unit has a holding structure or a locking structure for holding the diffusion sheet without using an adhesive substance. The diffusion sheet is
The diffusion concentration in the region intersecting with the light from the illumination light source traveling in the direction inclined to the opening side of the storage chamber with respect to the optical axis is smaller than the diffusion concentration in the region intersecting with the optical axis of the illumination light source. The refrigerator according to claim 1 or 2, wherein the printing is performed. The diffusion sheet is
The printing is performed so that the diffusion concentration in the region intersecting with the light traveling in the direction inclined to the back surface of the storage chamber with respect to the optical axis is smaller than the diffusion concentration in the region intersecting with the optical axis of the illumination light source. It is given. The refrigerator as described in any one of Claims 1-3 characterized by the above-mentioned. The illumination cover and the diffusion sheet have a round shape protruding in the traveling direction of light emitted from the illumination light source,
The round-shaped curvature of the diffusion sheet is smaller than the round-shaped curvature of the lighting cover in a state where the diffusion sheet is not attached to the lighting cover. A refrigerator according to claim 1. A shelf board for partitioning the storage chamber;
The diffusion sheet is
The said printing is performed so that the illumination intensity in the said shelf board of the light inject | emitted from the said illumination light source may become uniform. The refrigerator as described in any one of Claims 1-5 characterized by the above-mentioned. The said printing is given to both surfaces of the said diffusion sheet. The refrigerator as described in any one of Claims 1-6 characterized by the above-mentioned. An illumination light source;
A transparent illumination cover that covers a light emitting surface side of the illumination light source and forms a storage space for the illumination light source therein;
A diffusion sheet provided between the illumination cover and the illumination light source and subjected to printing for diffusing the light emitted from the illumination light source;
A sheet holding unit for holding the diffusion sheet by bringing the surface of the diffusion sheet into contact with the inner surface of the lighting cover;
The diffusing sheet is subjected to different printing depending on the positional relationship with the illumination light source. The lighting device according to claim 8, wherein the sheet holding unit has a holding structure or a locking structure that holds the diffusion sheet without using an adhesive substance.

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