JP2015114005A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator attached with a lighting module capable of more evenly lighting the whole of a storage chamber inner space with sufficient brightness while thinning a lighting attached to a storage chamber inner surface side.SOLUTION: In a refrigerator in which a lighting module 12 including a light source 13 and a light guide plate 14 is attached to a storage chamber 6, the lighting module 12 forms a light receiving surface 16 at least on one side surface extending along the transverse direction of the light guide plate 14 formed in a band plate shape, is arranged with a light source 13 oppositely to the light receiving surface 16, is constructed so as to emit light incident from the light receiving surface 16 to the light guide plate 14, from one surface side of front back surfaces of the light guide plate 14, forms a light-emitting surface 19 on the one surface, and is arranged in a prescribed position in the inner surface of the storage chamber 6 so as to let the light-emitting surface 19 face the inner side of the storage chamber 6, and make the longer direction of the light guide plate 14 cross the depth direction of the storage chamber 6.

Description

  The present invention relates to a refrigerator.

  Various items such as vegetables and fruits are stored in the refrigerator. In order to improve the visibility of these items, the refrigerator is usually provided with illumination on the side of the storage room to illuminate the storage room. It is configured as follows.

  Since there are various kinds of stored items stored in the storage chamber of the refrigerator, there is a demand for the refrigerator to increase the volume of the storage chamber. However, on the other hand, since the space for the refrigerator is usually limited, it is also required to suppress an increase in the external dimension of the refrigerator. Therefore, it is important to increase the volume of the storage room while suppressing an increase in the outer dimension of the refrigerator.

  In this regard, a refrigerator has been proposed in which an illumination module configured by using a light source and a light guide plate is attached as an illumination in a storage chamber. As such an illumination module, specifically, a module configured to emit light incident from a light source with the side surface of the light guide plate as a light receiving surface from the light emitting surface of the light guide plate to the internal space of the refrigerator is proposed. (Patent Document 1).

  Here, such an illumination module can be thinned by reducing the thickness of the light guide plate. Then, in a refrigerator equipped with a lighting module, the lighting can be thinned, the space required for the lighting arrangement can be reduced, and the volume of the storage room can be increased while suppressing an increase in the outer dimensions of the refrigerator. Can do.

JP 2005-344976 A

  However, when the volume of the storage room is increased in the refrigerator, there is a problem that it is not easy to illuminate the entire storage room space with sufficient brightness more uniformly with illumination attached to the surface side of the storage room. come.

  For example, in the refrigerator shown in Patent Document 1, a plurality of light guide plates are juxtaposed at intervals in the vertical direction on the side surface in the storage chamber. When a plurality of light guide plates are arranged side by side in this manner, the space near the position where the light guide plates are arranged becomes bright, but a dark space is likely to occur between adjacent light guide plates, and the interior of the storage chamber It tends to cause uneven brightness in the space.

  It is an object of the present invention to provide a refrigerator equipped with a lighting module capable of illuminating the entire interior of the storage room with sufficient brightness while making it possible to reduce the thickness of the light attached to the surface of the storage room. Objective.

The present invention is (1) a refrigerator in which a lighting module including a light source and a light guide plate is attached to a storage room,
In the illumination module, a light receiving surface is formed on at least one side surface of the light guide plate formed in a strip shape along the short side direction, and a light source is disposed facing the light receiving surface. The light incident on the light plate is configured to be emitted from one side of the front and back surfaces of the light guide plate to form a light emitting surface on the one surface, and the light emitting surface faces the inside of the storage chamber, A refrigerator characterized by being disposed at a predetermined position on the inner surface of the storage chamber so that the longitudinal direction of the light guide plate intersects the depth direction of the storage chamber;
(2) The above-described structure is configured such that when light is incident on the light guide plate from the light receiving surface, the luminance at a predetermined position near the light receiving surface on the light emitting surface is equal to or higher than the luminance at the center position of the light emitting surface. The refrigerator according to (1),
(3) The illumination module has a reflective structure formed on a back surface opposite to the light emitting surface of the front and back surfaces of the light guide plate, and includes a light reflecting sheet facing the back surface, (1) or the refrigerator according to (2),
(4) The illumination module includes a heat radiating plate on the outermost side opposite to the light emitting surface of the front and back surfaces of the light guide plate, and the light source is fixed to the heat radiating plate, (1) to (3) The refrigerator according to any one of
(5) A cover member having light transmittance is attached so as to cover the light emitting surface of the illumination module,
The illumination module is fixed to the cover member, the refrigerator according to any one of (1) to (4) above,
(6) The illumination module has a light receiving surface formed on one side surface extending in a short direction of the light guide plate, and a reflective material and a buffer material are provided in this order on the opposite end surface side with respect to the one side surface. To the refrigerator according to any one of (5).

The present invention also provides:
(7) The illumination module includes any one of the above (1) to (5), in which both side surfaces along the short direction of the light guide plate are light receiving surfaces, and light sources are disposed facing the respective light receiving surfaces. The refrigerator,
(8) The lighting module according to any one of (1) to (7), wherein the lighting module is attached to a predetermined position on each of the left and right inner side walls in the storage chamber while the light emitting surface is directed toward the storage chamber. refrigerator,
(9) The refrigerator according to any one of (1) to (8), attached so that the longitudinal direction of the light guide plate is the vertical direction,
(10) The refrigerator according to any one of (1) to (9), wherein the light emitting surface is oriented obliquely with respect to the front-rear direction in the storage chamber and toward the back side in the storage chamber.
(11) A shelf is provided in the refrigerator storage room,
The refrigerator according to any one of (1) to (10), wherein the illumination module is attached to a predetermined position on the front side of the front end of the shelf board and on the rear side of the front end of the inner surface of the storage chamber.
(12) The refrigerator according to (4) above, wherein the heat radiating plate is made of a metal plate.
(13) A heat sink fixing portion is formed at a predetermined position of the cover member,
The refrigerator according to (5), which is subordinate to (4) above, wherein the cover member sandwiches the heat sink of the lighting module at the heat sink fixing portion.
(14) A light guide plate fixing portion is formed at a predetermined position of the cover member,
The refrigerator according to (5) or (13), wherein the cover member holds the light guide plate of the illumination module at the light guide plate fixing portion,
(15) The refrigerator according to any one of (1) to (14) above, wherein an immersion part capable of accommodating the lighting module is formed in the refrigerator,
(16) The refrigerator has a light-transmissive cover member attached so as to cover the light emitting surface of the lighting module.
The lighting module is fixed to the cover member,
The immersive part that can accommodate the lighting module is formed in a shape that can be fitted with a cover member,
The cover member is formed with a locking portion having a locking claw, and a receiving portion configured to receive the locking claw and to lock the locking portion is formed at a predetermined position of the immersion portion. The refrigerator according to any one of (1) to (4) and (6) to (15) above may be provided.

  ADVANTAGE OF THE INVENTION According to this invention, the refrigerator attached with the illumination module which can illuminate the whole storage indoor space more uniformly with sufficient brightness, enabling thinning of the illumination attached to the storage room inner surface side is provided. It becomes possible.

FIG. 1 is a schematic perspective view schematically showing an embodiment of a refrigerator in the present invention. FIG. 2 is a schematic cross-sectional schematic diagram schematically showing an outline of a cross-sectional state taken along the line II of FIG. FIG. 3A is a schematic perspective schematic view schematically showing one embodiment of an illumination module attached to the refrigerator in the present invention. FIG. 3B is a schematic back view schematically illustrating a state when FIG. 3A is viewed from the back side of the light guide plate. FIG. 3C is a schematic side view schematically showing a state where the region X in FIG. 3A is enlarged, and is a diagram for explaining a transmission path of light incident on the light guide plate. FIG. 3D is a diagram corresponding to FIG. 3C in the case where the reflection structure is configured by a light reflection pattern layer. FIG. 4A is a schematic perspective view schematically showing an example in the case where the illumination module includes a light reflecting sheet. FIG. 4B is a schematic perspective schematic view schematically showing an embodiment in the case where the illumination module includes a heat sink. FIG. 4C is a schematic perspective schematic view schematically illustrating an embodiment in the case where the illumination module includes a position adjustment sheet. FIG. 5 is a schematic perspective view schematically showing an embodiment in which the illumination module includes a buffer material on the exposed surface side of the light reflecting material. FIG. 6A is a diagram for explaining a case where the description of the cover member in FIG. 2 is omitted, and is a diagram for explaining the arrangement of the illumination modules. FIG. 6B is a schematic cross-sectional schematic diagram schematically showing an outline of a cross-sectional state taken along line AA of FIG. FIG. 7 is a schematic cross-sectional schematic diagram schematically showing an outline of a cross-sectional state along the line BB in FIG. 2. FIG. 8A is a diagram for explaining an example of another embodiment of the structure for fixing the illumination module to the cover member, and corresponds to FIG. 6B. FIG. 8B is a diagram for explaining an example of an embodiment in which the direction of the light emitting surface of the illumination module is changed, and corresponds to FIG. 6B. FIG. 9A is a schematic plan view illustrating a case where the illumination module includes a structure in which a light guide plate is fixed to a heat radiating plate with a light guide plate fixing member. FIG. 9B is a schematic side view schematically showing a schematic state when FIG. 9A is viewed as a line-of-sight direction in a direction facing the side surface extending along the longitudinal direction of the light guide plate. FIG. 10A is a schematic plan view for explaining an example when the illumination module has a plurality of light receiving surfaces. FIG. 10B is a schematic plan view for explaining an embodiment in the case where the illumination module has a plurality of light receiving surfaces and a heat sink. FIG. 11 is a diagram for explaining a state of light from the lighting module toward the storage chamber in the refrigerator of the present invention. FIG. 12A is a main part explanatory view for explaining an embodiment in the case where the cover member covering the illumination module includes a heat sink fixing part and a light guide plate fixing part in the refrigerator of the present invention. FIG. 12B is a schematic cross-sectional schematic diagram schematically showing the state of the cross-section along the line CC in FIG. 12A. FIG. 12C is a schematic cross-sectional schematic diagram schematically showing the state of the cross section along the line D-D in FIG. 12A. FIG. 13 is a cross-sectional view corresponding to the cross section taken along the line AA of FIG. 2 for one embodiment of the refrigerator 1 of the present invention in which the lighting module 12 is attached so as to be in direct contact with the inner surface of the storage chamber 6. It is a figure which shows typically the general state of. FIG. 14A is a schematic front view schematically showing a state in which the storage chamber portion of the refrigerator is viewed from the front in one embodiment of the refrigerator 1 where the illumination module is attached to a predetermined position of the ceiling portion in the storage chamber. It is a schematic diagram. FIG. 14B is a schematic top view schematically showing a state of the refrigerator viewed from the top (planar) side in the embodiment shown in FIG. 14A. FIG. 15A is a case where the cover member covering the illumination module includes a heat sink fixing part and a light guide plate fixing part in the refrigerator of the present invention, and the illumination module positions the light source below the light receiving surface in the vertical direction of the refrigerator. It is principal part explanatory drawing for demonstrating one Example about the case where it is arrange | positioned like this and a spacer is provided. FIG. 15B is a schematic cross-sectional schematic diagram schematically showing the state of the cross section taken along the line EE of FIG. 15A. FIG. 16A is a case where the cover member covering the lighting module includes a heat sink fixing part and a light guide plate fixing part in the refrigerator of the present invention, and the lighting module receives light on both side surfaces positioned at opposite ends in the longitudinal direction of the light guide plate. It is principal part explanatory drawing for demonstrating one Example about the case where a light source is arrange | positioned so that a surface may be formed and facing each light-receiving surface, and a spacer is provided near each light source. FIG. 16B is a schematic cross-sectional schematic diagram schematically showing the state of the cross section along the line GG in FIG. 16A.

[Refrigerator 1]
As shown in FIG. 1, the refrigerator 1 includes a refrigerator body 2 and a cooling mechanism (not shown).

(Refrigerator body 2)
The refrigerator body 2 includes a heat insulating housing 4 having an opening 3 formed on the front surface side, and a door 5 attached so that the heat insulating housing 4 can be opened and closed through the opening 3. In the refrigerator 1, in the front-rear direction, the direction from the back side of the storage chamber 6 toward the door 5 side with the door 5 closed is defined as the front direction, and the direction away from the door 5 toward the back of the storage chamber 6. Let it be the backward direction (the direction of arrow F in FIGS. 2, 6 and 8). In the refrigerator 1, the front-rear direction coincides with the depth direction of the storage chamber 6. Further, when the observer views the refrigerator 1 so as to face the opening 3, the right and left hand directions are the right and left directions, respectively. In addition, a direction orthogonal to both the front-rear direction and the left-right direction is defined as the up-down direction.

(Storage room 6)
In the refrigerator main body 2, a storage chamber 6 that can store the object to be refrigerated and that can store the object to be refrigerated only needs to be formed in the internal space of the heat insulating casing 4. The section of the part may be the storage chamber 6, and the entire internal space of the heat insulating housing 4 may be the storage chamber 6. In the refrigerator 1 of the present invention, the space in the storage chamber 6 is cooled by a cooling mechanism.

(Insulated housing 4)
As shown in FIG. 2, the heat insulating housing 4 includes an exterior body 47 having a predetermined shape, and an interior body 48 that is attached in the exterior body 47 and can be designed into an appropriate shape according to the shape of the space in the storage chamber 6. In addition, a heat insulating material 49 is provided between the exterior body 47 and the interior body 48. Examples of the heat insulating material 49 include urethane resin.

(Door 5)
The refrigerator body 2 is provided with a door 5 so that the storage chamber 6 can be opened and closed. The door 5 that can open and close the portion of the storage chamber 6 is attached so as to be openable and closable by a shaft support structure (not shown) including a shaft body and a receiving portion. The shaft support structure is generally formed at the upper and lower ends on one side of the left and right ends of the portion forming the storage chamber 6 in the heat insulating housing 4. In the example of the refrigerator 1 shown in FIG. 1, when a line extending in the vertical direction through the arrangement position of the shaft support structure is hypothesized, a double arrow with the hypothetical line (the chain line h in FIG. 1) as an axis. A door 5 is attached to the heat insulating housing 4 so as to be rotatable in the Ro direction.

(Shelf 10 and drawer 11)
In the storage chamber 6 of the refrigerator 1, a shelf board 10 and a drawer 11 may be provided as appropriate. For example, in the example of FIG. 1, the shelf boards 10 are provided in three stages up and down, and a drawer 11 that is slidable in the front-rear direction is attached to a lower position of the bottom shelf board 10. The shelf board 10 and the drawer 11 are stored in the storage chamber 6, and the front ends thereof are positioned on the back side of the front end of the storage chamber 6.

(Vegetable room 7, freezer room 8)
Further, in the refrigerator main body 2, as shown in the example of FIG. 1, the whole interior space of the heat insulating housing 4 is partitioned into several parts, and in addition to the storage room 6, a vegetable room 7 for storing vegetables in cold storage, A compartment such as the freezer compartment 8 for freezing and storing the object to be frozen may be formed. Moreover, in the example of FIG. 1, in the refrigerator main body 2, the drawer structure 9 is attached to each part of the vegetable compartment 7 and the freezer compartment 8, and the space in the drawer structure 9 is the vegetable compartment 7, A space for the freezer compartment 8 is formed. When the refrigerator 1 has the vegetable compartment 7 and the freezer compartment 8, the vegetable compartment 7 and the freezer compartment 8 can also be cooled by the cooling mechanism. The positions of the vegetable compartment 7 and the freezer compartment 8 are not particularly limited. As shown in the example of FIG. 1, the vegetable compartment 7 may be located above the freezer compartment 8, or the vegetable compartment 7 is more than the freezer compartment 8. It may be located on the lower side.

[Lighting module 12]
As shown in FIGS. 2, 6, and the like, the refrigerator 1 has a lighting module 12 attached in the storage chamber 6. The illumination module 12 includes a light source 13 and a light guide plate 14 as shown in FIGS. 3A to 3D and the like.

  The illumination module 12 has a light receiving surface 16 formed on at least one side surface 15 extending along the short direction of the light guide plate 14. The illumination module 12 is arranged with the light source 13 facing the light receiving surface 16. Further, the illumination module 12 is configured to emit light incident on the light guide plate 14 from the light receiving surface 16 from the one surface 18 side of the front and back surfaces of the light guide plate 14, and form a light emitting surface 19 on the one surface 18. ing. In the example of FIG. 3A, the light emitting surface 19 is formed by a region surrounded by a broken line in the one surface 18. As shown in the example of FIG. 3A, the light emitting surface 19 may be configured by substantially the entire one surface 18 of the front and back surfaces of the light guide plate 14, or a region defined in a predetermined portion of the one surface 18. It may be constituted by. In the light guide plate 14, the surface on the opposite side to the one surface 18 that forms the light emitting surface 19 is defined as the back surface 20. In FIG. 3A, the direction from the back surface 20 toward the light emitting surface 19 is the Z-axis direction, and the short direction and the long direction of the light guide plate 14 are the directions along the X-axis direction and the Y-axis direction, respectively. The X-axis direction and the Y-axis direction are the same as in FIG. 3B.

(Light guide plate 14)
In the illumination module 12, the light guide plate 14 is formed in a strip shape. As described above, the light guide plate 14 has the light receiving surface 16 formed on at least one of the side surfaces 15 and 25 extending along the short side direction. The light guide plate 14 is preferably mirror-finished on the light receiving surface 16 in order to allow light to enter efficiently.

  The thickness of the light guide plate 14 can be selected as appropriate, but is usually in the range of about 2 mm to 5 mm.

(Material of light guide plate 14)
The light guide plate 14 is preferably composed of a resin sheet material. The sheet material constituting the light guide plate 14 may be a resin sheet material that has light transmittance and can transmit light incident from the side surface 15 and the side surface 25 in the surface direction (the direction in which the light emitting surface 19 spreads). There is no particular limitation. Specifically, as the resin composition forming the sheet material constituting the light guide plate, a styrene resin, a resin made of a copolymer of styrene and a (meth) acryl compound, a (meth) acryl resin, a polycarbonate resin, or the like is used. be able to.

  Here, the styrenic resin is a polymer of a predetermined monomer compound, and the monomer compound contains styrene. About (meth) acrylic resin, resin comprised from the polymer of a (meth) acrylic compound is shown, and acrylic resin or methacrylic resin is shown. Here, the (meth) acrylic compound indicates a compound having a (meth) acryloyl group as a functional group, and indicates an acrylic compound or a methacrylic compound. In addition, about a (meth) acryloyl group, an acryl group or a methacryl group is shown.

  The light guide plate 14 is made of a styrene resin or a resin made of a copolymer of styrene and a (meth) acrylic compound rather than a sheet material made of a (meth) acrylic resin from the viewpoint of suppressing dimensional change due to humidity as much as possible. It is preferable to use a sheet material to be used.

  The sheet material constituting the light guide plate 14 may appropriately include an additive. Specific examples of the additive include an antioxidant and an ultraviolet absorber.

(Reflection structure 21)
A reflection structure 21 is formed on the light guide plate 14 in a predetermined region (reflection structure formation region) on the surface facing the back surface 20 side. The reflection structure forming region is not particularly limited, and may be appropriately set according to the standard of the refrigerator 1 to which the light guide plate 14 is attached. In the example of FIG. 3B, the reflective structure forming region is set to a substantially rectangular region, and the concave portion 22 is arranged along the outline of the reflective structure forming region, and the reflective structure forming region is more than the concave portions 22 arranged along the contour. A concave portion 22 is further arranged at a predetermined position inside.

  The reflection structure 21 is not particularly limited as long as it is configured to be able to reflect light traveling toward the back surface 20 out of light propagating in the light guide plate 14 in a direction intersecting the thickness direction of the light guide plate 14. It is not something. As the reflecting structure 21, for example, a concave group 23 as shown in FIG. 3B is exemplified.

  The case where the reflecting structure 21 is composed of the recess group 23 will be further described. The recess group 23 is configured by forming a large number of recesses 22 in a predetermined arrangement pattern. The arrangement pattern of the recesses 22 constituting the recess group 23 is not particularly limited, but the recess group 23 shown as an example in FIG. 14 are arranged in the longitudinal direction (Y-axis direction) at intervals in the longitudinal direction (Y-axis direction) of the light guide plate 14 so as to form a vertical and horizontal lattice shape as a whole. It is formed in a pattern in which the recesses 22 are arranged on the surface. The recess group 23 is not particularly limited in the shape of each recess 22, and a large number of recesses 22 may be formed in the same shape as each other, or include a plurality of recesses 22 formed in different shapes. It may be constituted by. In the example of FIGS. 3B and 3C, the recess 22 is formed in a dot shape in plan view of the light guide plate 14.

  The arrangement interval between the adjacent recess rows 24, 24 can be set as appropriate. In the example of FIG. 3, the arrangement interval between the adjacent recess rows 24, 24 is opposite to the arrangement interval (S <b> 1) between the recess rows 24, 24 located closer to the light receiving surface 16 than the light receiving surface 16. When comparing the arrangement interval (S2) between the recess rows 24, 24 located closer to the side surface 25 on the end side, S1 is formed to be longer than S2. Here, in the reflection structure forming region, the area where the arrangement interval between the adjacent recess rows 24 and 24 is shorter than the area where the arrangement interval between the adjacent recess rows 24 and 24 is larger, is propagated to the reflection structure 21. It is possible to increase the proportion of the light that is directed to the light emitting surface 22 out of the emitted light. According to such a reflection structure 8, the luminance distribution of the light emitting surface 19 can be efficiently adjusted as necessary, and the portion of the light emitting surface 19 along the light emitting surface 19 is further away from the light receiving surface 16. It becomes easy to ensure luminance. In addition, the arrangement | positioning space | interval between the recessed part rows 24 and 24 is specified as follows. Assuming a line connecting the centers of the recesses 22 constituting each recess row 24 (recess row center line), the distance between the recess row center lines with respect to the adjacent recess rows 24, 24 is specified. The arrangement interval between the columns 24, 24 is specified.

  As described above, when there is one light receiving surface 21 in the light guide plate 1, the arrangement interval between the adjacent recess rows 24, 24 is a recess located near the side end 15 surface where the light receiving surface 16 is formed. It is preferable that the arrangement interval between the rows 24 and 24 is set to be larger than the arrangement interval between the recess rows 24 and 24 at a position close to the end 25 surface opposite to the light receiving surface 16. As will be described later, the light guide plate 1 may include a plurality of light receiving surfaces 16. For example, as shown in FIGS. 10A and 10B, the light receiving surface 16 may also be formed on the side end 25 surface. In this case, the arrangement interval between the adjacent recess rows 24 and 24 is such that the luminance at the center position of the light emitting surface 19 (position C in FIG. 10A) is closer to the light receiving surface 16 than the predetermined position (position in FIG. 10A). It becomes easy to configure so as to be equal to or less than the luminance of K). In this case, the luminance distribution of the light emitting surface 19 is adjusted by adjusting the arrangement interval between the recess rows 24 and 24 located near the side surfaces 15 and 25 where the light receiving surfaces 16 and 16 are formed, and the light receiving surfaces 16 and 16. This can be realized by adjusting the arrangement interval between the recess rows 24 and 24 located far from both of the side surfaces 15 and 25 formed. In the example of FIG. 10A, the region forming the light emitting surface 19 on the one surface 18 of the light guide plate 14 is formed by a region surrounded by a broken line, as in FIG. 3A. The same applies to FIG. 9A. Further, in FIGS. 4A, 4B, 4C, 5, and 10B, for convenience of explanation, a broken line indicating a region forming the light emitting surface 19 is omitted.

(Formation of the reflective structure 21)
The reflection structure 21 as described above can be formed on the light guide plate 14 by forming a large number of concave structure portions in a predetermined pattern using a known appropriate method. Specifically, the reflective structure 21 can be formed by irradiating a laser on the back surface 20 side to form a large number of concave portions 22.

(Concave portion 22)
The shape of the recess 22 is not particularly limited as described above, and can be selected as appropriate, and may be formed in a linear shape or a curved shape in addition to the dot shape as described above. Even in the case of being formed in a dot shape, a circular shape, a triangular shape, a rectangular shape, a polygonal shape of pentagon or more, a chamfered rectangular shape, or the like can be selected as appropriate.

  The depth and area of each recess 22 can be appropriately selected according to various conditions such as the amount of light incident from the light receiving surface 16, the size of the light guide plate 14, and the amount of light to be emitted from the light emitting surface 19.

  In the reflecting structure 8, the dimension (width dimension) along the width direction (short direction) of the light guide plate 14 among the dimensions of the recess 22 is the width dimension of the recess 22 located closer to the light receiving surface 16. (W1) is formed such that W2 is longer than W1 when the width dimension (W2) of the recess 22 located closer to the side surface 25 opposite to the light receiving surface 16 is compared. It is preferred that According to such a reflecting structure 8, the luminance distribution of the light emitting surface 19 can be adjusted efficiently as necessary, and it is easy to ensure the luminance even in a portion far from the light receiving surface 16.

The laser used for forming the pattern of the recess 22 is not particularly limited as long as it has energy capable of forming the recess 22 on the back surface 20 side. However, the stability of the laser irradiation energy and the high output pulse are not limited. A CO ₂ laser (carbon dioxide laser) is preferable in that it is possible to easily obtain a wave.

(Another embodiment of the reflective structure 21)
In the above description, the case where the reflecting structure 21 includes the concave group 23 has been described as an example. However, the reflecting structure 21 includes the light reflecting pattern layer 27 patterned on the back surface 20 as illustrated in FIG. 3D. It may be. The light reflection pattern layer 27 is composed of a group of a large number of light reflection pattern layer forming units 28 formed in a predetermined shape. A formation pattern such as the shape and arrangement pattern of the light reflection pattern layer forming unit 28 can be selected as appropriate, and a pattern similar to the formation pattern of the recess 22 described above may be selected in plan view of the reflection structure 21. The light reflecting pattern layer forming unit 28 is not particularly limited as long as it has a light reflecting structure, and a white pigment such as titanium oxide or a metallic material having gloss such as silver is used as a resin material such as a binder resin. It may be constituted by a solidified structure of a paste composition that is appropriately contained in the composition. The light reflection pattern layer 27 composed of the group of light reflection pattern layer forming units 28 is appropriately subjected to a printing method such as screen printing on the back surface 20 by using the paste composition described above. A pattern can be formed as appropriate.

(Light source 13)
The light source 13 is disposed with the light source light emitting surface 30 facing the light receiving surface 16. Although the light source 13 is not specifically limited, In the example of FIG. 3, it is comprised by the light source member 32 provided with the several light emitting element 31. FIG. The light source light emitting surface 30 of the light source 13 may be in contact with the light receiving surface 16, or a slight gap may exist between the light source light emitting surface 30 and the light receiving surface 16. A slight difference between the light-emitting surface 30 and the light-receiving surface 16 can be suppressed in the case where a slight dimensional change occurs in the light-guide plate 14 due to a change in humidity. It is preferable that there is a gap.

(Light source member 32)
The light source member 32 includes a plurality of light emitting elements 31, a fixed body 33 that fixes the light emitting elements 31, and wiring that is attached to the fixed body 33 and electrically connects the light emitting elements 31 and an external power source (not shown). (Not shown). The fixed body 33 includes a base part 35 and a sealing part 34. The base portion 35 is formed of a resin base material, and the light emitting element 31 and wiring are disposed on the base portion 35. Although the arrangement pattern of the plurality of light emitting elements 31 can be selected as appropriate, in the example shown in FIG. 3B, the light emitting elements 31 are arranged side by side at intervals. The sealing portion 34 is formed by covering the light emitting element 31 and the wiring arranged on the base portion 35 with a sealing material such as a resin that can be used for molding such as silicon resin, and further solidifying the sealing material. Is done. The wiring is arranged so that the external power supply and the light emitting element 31 can be electrically connected, and the light source member 32 can control the lighting and extinguishing of the light emitting element 31 according to whether or not power is applied from the external power supply. It is comprised so that. In the optical member 32, the sealing portion 34 is configured to have optical transparency, and light emitted from the light emitting element 31 is emitted mainly from the exposed surface of the sealing portion 34 to the outside. Thus, in the light source member 32, the exposed surface of the sealing portion 34 forms the light source light emitting surface 30. In this example, the light source member 32 has a configuration in which the light emitting element 31 is substantially embedded in the fixed body 33. However, the light source member 32 may have a configuration in which the light emitting element 31 is exposed to the outside.

(Light emitting element 31)
The light emitting element 31 is not particularly limited in its light emitting mechanism, but an LED (Light Emitting Diode) is preferably employed in that it has better light directivity than an incandescent bulb. When the light emitting element 31 is an LED, the light emitting element 31 is excellent in light directivity, and thus it is possible to form the light source 13 that can generate strong light having directivity even with a small size. Even if the light guide plate 14 is thin and the area of the light receiving surface 16 is small, it becomes easy to efficiently irradiate light toward the light receiving surface 16.

(Processing of light emitting surface 19 side surface (exposed surface))
The light guide plate 14 may be formed such that the exposed surface on the light emitting surface 19 side is flat, or a prism pattern or lenticular for controlling the direction of light emitted outward from the light emitting surface 19 side on the exposed surface. Processing for shaping a pattern or the like may be performed, and unevenness may be formed by appropriately providing a structure for diffusing light. Such processing may be performed on a cover member 57 described later.

(Reflecting material 36)
As shown in FIG. 3A, FIG. 3B, etc., the light guide plate 14 has a single light receiving surface 16 from the viewpoint of further improving the light utilization efficiency. 25 is preferably provided with a reflecting material 36 capable of forming a light reflecting surface. When the reflecting material 36 is thus provided on the light guide plate 14, a part of the light incident from the light receiving surface 16 passes through the light guide plate 14 and leaks from the side surface 25 on the side opposite to the light receiving surface 16. Even in the presence of light, the light can be reflected by the reflector 36 and directed again into the light guide plate 1, and the risk of light leaking from the side surface 25 can be further effectively suppressed. And the light utilization efficiency can be further improved.

  The reflective material 36 may be provided so as to cover the entire region excluding the region where the light receiving surface 16 is formed, of the entire circumferential side surface of the light guide plate 14. Specifically, when the light guide plate 14 is formed in a rectangular shape as in the example of FIG. 3 and the light receiving surface 16 is formed on the side surface 15 extending along one side thereof, the remaining three sides are provided. The reflecting material 36 may be provided so as to cover the side surface. As the reflecting material 36, a resin sheet material or a metal sheet material having light reflectivity can be used as appropriate, and MCPET (trademark) manufactured by Furukawa Electric Co., Ltd. can be used as appropriate.

(Light reflection sheet 37)
As shown in FIG. 4A, the illumination module 12 is preferably provided with a light reflecting sheet 37 facing the back surface 20 of the light guide plate 14. As the light reflecting sheet 37, a resin sheet material having light reflectivity may be used as appropriate, and, for example, the same as the reflecting material 36, for example, MCPET (trademark) manufactured by Furukawa Electric (Furukawa Electric Co., Ltd.), Specifically, RF188 manufactured by Tsujiden Co., Ltd. can be used. In addition, the point that the light reflection sheet 37 is provided so as to be as close to or as close to the back surface 20 as possible can effectively suppress the risk of light leaking from the gap between the light reflection sheet 37 and the back surface 20. Is preferred.

(Heatsink 38)
As shown in FIG. 4B, the illumination module 12 preferably has a heat radiating plate 38 disposed on the outermost surface of the light guide plate 14 on the side opposite to the light emitting surface 19. Since the illumination module 12 includes the heat radiating plate 38, heat that can be generated by the light source 13 or the like is easily transmitted to the heat radiating plate 38, and the temperature rise of the light source 13 can be suppressed.

  The heat radiating plate 38 is not particularly limited, but is preferably a metal plate in terms of excellent thermal diffusibility and rigidity. An example of the metal plate constituting the heat radiating plate 38 is an aluminum plate.

  In the illumination module 12, the light source 13 is preferably fixed to the heat radiating plate 38. In this case, the heat generated by the light source 13 can be easily transmitted to the heat radiating plate 38, and the temperature rise of the light source 13 due to the heat generated in the light emitting element 31 and the wiring can be more effectively suppressed. Become.

  As a method of fixing the light source 13 to the heat radiating plate 38, a method of fixing with an adhesive or the like, a method of fixing with a fixing member, or the like can be used as appropriate.

  Further, when the illumination module 12 includes the heat radiating plate 38, the light guide plate 14 is preferably fixed to the heat radiating plate 38. When the light guide plate 14 is fixed to the heat radiating plate 38, the possibility that the light guide plate 14 bends more than necessary when a force is applied to the light guide plate 14 is suppressed.

  As a method of fixing the light guide plate 14 to the heat radiating plate 38, a method of fixing with an adhesive or the like, a method of fixing using the light guide plate fixing member 39 as shown in FIGS. 9A and 9B, and the like are specifically used. Can do. In the example of FIG. 9, the light guide plate fixing member 39 includes a pressing portion 40 formed in a shape corresponding to the shape of the light guide plate 14 (a U shape in the example of FIG. 9), and an end portion of the pressing portion 40. Is provided with a fixing portion 41 formed to extend. The fixing portion 41 has a through hole through which a fixing material such as a screw can be passed. Then, the pressing portion 40 is applied from the outer surface side of the light guide plate 14, and the fixing material is passed through the hole formed in the fixing portion 41. A hole is formed in the heat radiating plate 38 at a position facing the through hole of the fixing portion 41, and the fixing material is passed through the hole. Thus, the light guide plate 14 is fixed to the heat radiating plate 38. The material of the light guide plate fixing member 39 is not particularly limited, and can be appropriately selected from resin, metal, and the like. In the case where the light guide plate fixing member 39 does not transmit visible light, the portion of the one surface 18 of the light guide plate 14 hidden by the light guide plate fixing member 39 is out of the region where the light emitting surface 19 is formed. It becomes. In the example of FIG. 9A, the light emitting surface 19 is a region surrounded by a broken line.

(Shape of heat sink 38)
The shape of the heat sink 38 is not particularly limited. The heat radiating plate 38 may be a flat single plate. 4B, 4C, 5 and 9 and the like, the heat radiating plate 38 is configured to include a strip plate-like flat plate portion 42, and extends along the short side direction of the flat plate portion 42. The extending wall portion 43 may be extended and formed so as to rise from the end portion. In this example, the light source 13 is disposed so that the light source light emitting surface 30 is a non-opposing surface with the extending wall 43, and is fixed to the extending wall 43.

  In FIG. 4, the heat radiating plate 38 has a length in the short direction of the flat plate portion 42 longer than a length in the short direction of the light guide plate 14, and the light guide plate 14 is arranged with respect to the heat radiating plate 38. In such a case, a portion (non-opposing portion) that protrudes from the light guide plate 14 is generated. In the non-opposing portion, a through hole 44 is formed at a predetermined position. The through hole 44 is a hole through which the fixing member 63 can be penetrated when the heat radiating plate 38 is fixed to the cover member 57 and the heat insulating housing 4 which will be described later with reference to FIGS. Eggplant.

(Buffer material 45)
In the case where the illumination module 12 forms the light receiving surface 16 on the one side surface 15 extending along the short direction of the light guide plate 14, the illumination module 12 is on the opposite end side to the one side surface 15 as shown in FIG. The reflective material 36 and the buffer material 45 may be provided on the side surface 25 in this order. This cushioning material 45 may be referred to as a side cushioning material. In this case, when the illumination module 12 further includes the heat radiating plate 38, it is preferable that the extending wall portion 43 is formed so as to cover the exposed surface side of the cushioning material 45. At this time, the buffer material 45 may be in non-contact with the extending wall portion 43 facing the buffer material 45, but it is preferable that the buffer material 45 is in contact with the extending wall portion 43 in terms of further stabilizing the arrangement position of the light guide plate 14. By the way, as will be described later, when the light guide plate 14 undergoes a dimensional change in the longitudinal direction, the buffer material 45 is easily subjected to stress outward in the longitudinal direction of the light guide plate 14. In this regard, when the extending wall portion 43 is formed so as to cover the exposed surface side of the buffer material 45, stress applied to the light guide plate 14 in the longitudinal direction outward can be efficiently received by the buffer material 45.

  The side cushioning material 45 is not particularly limited as long as it has a cushioning property, and a cushioning member formed using a material selected from a material group such as silicon and urethane can be appropriately employed. is there.

  Here, the illumination module 12 is attached to the refrigerator 1. There are various things stored in the refrigerator 1, and there are foods containing a lot of moisture. Then, in the refrigerator 1, possibility that humidity will change repeatedly variously becomes high. That is, the light guide plate 14 constituting the illumination module 12 may repeatedly undergo dimensional changes due to the influence of humidity in the storage chamber 6. If the dimensional change of the light guide plate 14 continues repeatedly, the relative positional relationship between the light guide plate 14 and the light source 13 tends to shift, and a part of the light generated from the light source 13 is received by the light receiving surface of the light guide plate 14. 16 is likely to come off. In this regard, the side cushioning material 45 is provided in the illumination module 12, so that the relative positional relationship between the light guide plate 14 and the light source 13 is maintained by the side cushioning material 45 even if the dimensional change of the light guiding plate 14 continues. Easy to do.

(Position adjustment sheet 46)
In the illumination module 12, when the light reflecting sheet 37 and the heat radiating plate 38 are provided on the back surface 20 side of the light guide plate 14, the position adjustment sheet 46 is interposed between the light reflecting sheet 37 and the heat radiating plate 38 as shown in FIG. 4C. May be provided. The position adjustment sheet 46 is made of an insulating sheet material. Since the illumination module 12 includes the position adjustment sheet 46, the light receiving surface 16 of the light guide plate 14 and the light source 13 can be more surely face each other.

(Number of light-receiving surfaces 16 of the illumination module 12 formed)
In FIG. 3 and the like, the case where one light receiving surface 16 is formed as the illumination module 12 is illustrated, but the present invention is not limited to this. For example, as illustrated in FIG. 10A, in the illumination module 12, the light receiving surfaces 16, 16 may be formed on both side surfaces 15, 25 extending along the short direction of the light guide plate 14. In this case, the light guide plate 14 is formed with two light receiving surfaces 16 and 16. The illumination module 12 is provided with light sources 13 and 13 facing the two light receiving surfaces 16 and 16, respectively. In this case, light can be incident on the light guide plate 14 from both of the two light receiving surfaces 16 and 16, and the luminance at the predetermined position K near the respective light receiving surfaces 16 on the light emitting surface 19 is more effective than the luminance at the central position C. It becomes easy to improve it. In addition, as shown in FIG. 10B, the heat radiating plate 38 may be provided when the two light receiving surfaces 16 and 16 are formed as the illumination module 12.

(Spacer 74)
The illumination module 12 may be provided with a spacer 74 near the light source 13 such as a predetermined position around the light source 13 as shown in FIGS. 15A, 15B, 16A, and 16B. The spacer 74 is not particularly limited in material as long as it has a predetermined hardness such as metal or resin. Moreover, the spacer 74 does not specifically limit the presence or absence of buffering properties. Although the shape of the spacer 74 is not particularly limited, the spacer 74 is arranged and fixed so as to protrude in a direction from the predetermined position of the heat radiating plate 38 toward the light receiving surface 16. In the example of FIGS. 15 and 16, the spacer 74 is arranged and fixed so as to protrude from the extending wall portion 43 of the heat radiating plate 38 in the direction toward the light receiving surface 16. The protruding tip of the spacer 74 exists at a position protruding toward the light receiving surface 16 from the light source light emitting surface 30 of the light source 13. Further, when the illumination module 12 has the light receiving surfaces 16 and 16 formed on both side surfaces 15 and 25 in the longitudinal direction of the light guide plate 14, as shown in FIGS. 16A and 16B, the spacer 74 has a side surface. It is preferable to be provided near each of the light sources 13 and 13 facing the light receiving surfaces 16 and 15 of the 25 and 25. When the illumination module 12 is provided with the spacer 74, when the dimension of the light guide plate 14 along the longitudinal direction of the light guide plate 14 is changed due to the change in temperature or humidity in the storage chamber 6, the light guide plate 14 is guided. The optical plate 14 comes into contact with the spacer 74 before contacting the light source 13, and a state where a space is formed between the light source 13 and the light receiving surface 16 can be maintained, and the light guide plate 14 makes strong contact with the light source 13. It is possible to suppress the risk of the occurrence.

  In the refrigerator 1, when the lighting module 12 is attached to the inner wall 50 in the storage room 6, the upper side and / or the lower side of the light guide plate 14 in the vertical direction of the refrigerator 1 (the arrow Q direction in FIGS. 15A and 16A). In such a case, it is preferable that the spacer 74 positioned below the light guide plate 14 is formed of a harder material. In this case, the spacer 74 is hard enough to maintain the shape of the spacer 74 even when the weight of the light guide plate 14 is applied from the protruding end side to the spacer 74 positioned below the light guide plate 14. It is preferable to be formed. Thus, if the spacer 74 located below the light guide plate 14 is rigidly formed, even if the light guide plate 14 is displaced to the light source 13 side by its own weight, the light guide plate 14 is received by the spacer 74. Thus, the possibility that excessive stress is applied to the light source 13 from the light guide plate 14 can be suppressed.

[Light Emitting Surface 19 in Lighting Module 12]
The illumination module 12 may appropriately set the luminance distribution on the light emitting surface 19 when light enters the light guide plate 14 from the light receiving surface 16, but the light emitting surface 19 when light enters the light guide plate 14 from the light receiving surface 16. It is preferable that the luminance at a predetermined position near the light receiving surface 16 in FIG. Such a configuration (light-receiving surface side high-intensity configuration) can be specifically realized by adjusting the formation pattern of the reflection structure 21, the number and positions of the light-receiving surfaces 16, and the like.

  For example, the light receiving surface side high luminance configuration can be realized as shown in the following example when the reflecting structure 21 is formed by the concave group 23 and the concave group 23 is configured by a large number of concave columns 24. . First, the rear surface 20 is equally divided into three regions so as to be arranged in a surface sequence in the direction along the longitudinal direction of the light guide plate 14, and other than a predetermined region including a predetermined region including the true back position with respect to the central position C of the light emitting surface 19. With respect to the region, the arrangement interval of the recess rows arranged adjacent to each other in the longitudinal direction of the light guide plate 14 is set to become narrower as the distance from the light receiving surface 16 increases. On the other hand, for a predetermined region including the true back position with respect to the central position C of the light emitting surface 19, the arrangement interval of adjacent recess rows is set so as to become wider as the true back position with respect to the central position C of the light emitting surface 19 gets closer. In this way, by setting the arrangement interval between the recess rows and arranging the recess rows to form the recess group, the light emitting surface 19 is closer to the predetermined position near the light receiving surface 16 than the center position of the light emitting surface 19. It becomes easy to form a state with high luminance.

  Further, when the illumination module 12 forms the light receiving surface 16 on the side surfaces 15 and 25 of the light guide plate 14, the luminance at a predetermined position near the light receiving surface 16 on the light emitting surface 19 is higher than that at the center of the light emitting surface 19. It becomes easier to achieve a raised state.

(Center position of light emitting surface 19)
The central position of the light emitting surface 19 is divided into two equal parts in a position on the straight line n that bisects the light emitting surface 19 in the direction along the longitudinal direction of the light guide plate 14 and in the direction along the short direction of the light guide plate 14. The position is specified on a straight line m (position C in FIGS. 3 and 10).

(Predetermined position near the light receiving surface 16 on the light emitting surface 19)
The predetermined position near the light receiving surface 16 on the light emitting surface 19 is a position set as a position closer to the light receiving surface 16 than the center position C of the light emitting surface 19 in plan view of the light guide plate 14 (in FIGS. 3 and 10). Position K) is indicated. More specifically, the predetermined position near the light receiving surface 16 on the light emitting surface 19 is a position on a straight line m that bisects the light emitting surface 19 through the position C, and the straight line m and the contour of the light emitting surface 19 It is a position closer to the light receiving surface 16 among the intersections. The predetermined position near the light receiving surface 16 on the light emitting surface 19 is specified according to the light receiving surface 16, and one is specified for one light receiving surface 16. When the two light receiving surfaces 16 and 16 are formed on the side surfaces 15 and 25 that are opposite to each other, the light receiving surfaces 16 and 16 are specified. In this case, one of the two positions, which are positions on the straight line m and specified as the intersection of the straight line m and the contour of the light emitting surface 19, is about one of the light receiving surfaces 16 and 16. The predetermined position near the light receiving surface 16 of the other, and the other position is a predetermined position near the light receiving surface 16 for the other.

[Surface luminance ratio on the light emitting surface 19]
In the illumination module 12, as described above, when light enters the light guide plate 14 from the light receiving surface 16, the luminance (BK) at a predetermined position K near the light receiving surface 16 on the light emitting surface 19 is the central position C of the light emitting surface 19. However, it is more preferable that the luminance BK exceeds the luminance BC. In this case, in the space in the storage room 6 of the refrigerator 1 to which the lighting module 12 is attached, the balance between the illuminance at the non-corner corners such as the central part and the illuminance at the corners in the storage room 6 is improved. The space in 6 can be brightened more uniformly. The corners of the storage chamber 6 are portions of the inner surface of the storage chamber 6 that correspond to the boundary between the inner wall 50 and the back wall 73 of the storage chamber 6, portions that correspond to the boundary 72 of the back wall 73 and the ceiling portion 70, A boundary between the wall 73 and the bottom, a portion corresponding to the boundary 71 between the ceiling 70 and the inner side wall 50, and a portion corresponding to the boundary between the bottom and the inner side wall 50 are shown in the example of FIG. It is such a part. The non-corner corner portion of the storage chamber 6 is a portion inside the storage chamber 6 excluding the corner corner portion, and a portion including the central portion Pce.

  When the boundary portion Pdi is a portion corresponding to the boundary between the inner wall 50 and the inner wall 73, when the boundary between the inner wall 50 and the inner wall 73 forms a bent portion, the bent portion is used as the boundary portion. Pdi (not shown). In addition, as shown in FIGS. 11, 14A, and 14B, the inner wall 50 and the inner wall 73 are curved in the vicinity of the edge, and the inner wall 50 and the inner wall 73 are curved in a concave shape with a slightly gentle boundary. When the curved portion is formed, a boundary portion Pdi is defined at the center of the curved portion. The boundary portion Pdi is determined in this way because the boundary portion Pdi corresponds to the portion corresponding to the boundary 72 between the back wall 73 and the ceiling portion 70, the boundary between the back wall and the bottom portion, and the boundary 71 between the ceiling portion 70 and the inner wall 50. The same applies to any of the cases where the portion corresponds to the boundary between the bottom portion and the inner wall 50. Further, the central portion Pce is defined at the central portion of the storage chamber 6 in the vertical and horizontal directions. In FIG. 11, for convenience of explanation, illustration of a portion corresponding to the boundary between the back wall 73 and the bottom is omitted for the boundary portion Pdi. In FIG. 14, for convenience of explanation, the boundary between the back wall 73 and the bottom is shown. A portion corresponding to the boundary between the bottom and the inner wall 50 is not shown.

[Attaching the lighting module 12 to the refrigerator 1]
The lighting module 12 as described above is attached to the refrigerator 1 in the storage chamber 6. At this time, the illumination module 12 is disposed at a predetermined position on the inner surface of the storage chamber 6. The inner surface in the storage chamber 6 is formed by a ceiling portion 70 that forms the top surface, an inner wall 50 that forms the inner surface, a rear wall 73 that forms the inner surface, and a bottom portion that forms the bottom surface. Therefore, the illumination module 12 may be disposed on the ceiling 70 in the storage chamber 6 as shown in FIGS. 14A and 14B, or on the inner wall 50 in the storage chamber 6 as shown in FIG. It may be arranged on the back wall 73 in the storage chamber 6. Moreover, the illumination module 12 may be arrange | positioned so that the direction along the boundary may align with the longitudinal direction of the light-guide plate 14 in the position of the boundary of the back wall 73 and the inner wall 50 (not shown). However, the illumination module 12 has the storage chamber 6 in that it effectively illuminates the entire space in the storage chamber 6 more uniformly by illuminating the corner corners and non-corner corners in the storage chamber 6 in a balanced manner. It is preferable to be disposed on the inner ceiling portion 70 and / or the inner wall 50 in the storage chamber 6. Moreover, it is more preferable that the illumination module 12 is arranged at least on the inner wall 50 in the storage chamber 6 in that the effect of illuminating the entire space in the storage chamber 6 more uniformly is further improved. In FIG. 14, reference numeral 71 denotes a boundary between the ceiling part 70 and the inner wall 50, and this boundary constitutes a part of the periphery of the ceiling part 70 and also constitutes a part of the periphery of the inner wall 50. To do. Reference numeral 72 denotes a boundary between the ceiling part 70 and the back wall 73, and this boundary forms a part of the periphery of the ceiling part 70 and also forms a part of the periphery of the back wall 73.

  The lighting module 12 is arranged such that the light emitting surface 19 faces the inside of the storage chamber 6 and the longitudinal direction of the light guide plate 14 intersects the depth direction of the storage chamber 6 of the refrigerator 1. When the illumination module 12 is attached in this way, the predetermined position of the light emitting surface 19 near the light receiving surface 16 tends to be closer to the corner of the storage chamber 6, and the inner peripheral surface of the storage chamber 6 It becomes easy to ensure the illuminance at the corner (for example, the boundary Pdi in FIG. 11). In general, in the refrigerator 1, there is a high possibility that stored items are stored toward the back of the storage chamber 6. Then, if the illumination module 12 is arrange | positioned so that the longitudinal direction of the light-guide plate 14 and the depth direction of the storage chamber 6 of the refrigerator 1 may mutually align, it will be located in the back | inner side of the storage chamber 6 among the illumination modules 12. The portion is likely to be in a state of being blocked by the stored items, and a problem that the light from the illumination module 12 does not easily enter the storage chamber 6 is likely to occur. In this respect, the illumination module 12 is arranged such that the light emitting surface 19 faces the inside of the storage chamber 6 and the longitudinal direction of the light guide plate 14 intersects the depth direction of the storage chamber 6 of the refrigerator 1. Such problems are also suppressed.

  The lighting module 12 may be attached as shown in FIG. 13, and the lighting module 12 is fixed to the cover member 57 and the cover member 57 is attached to the storage chamber 6 as will be described later. May be installed in the storage chamber 6. FIG. 13 is a cross-sectional view corresponding to a cross section taken along the line AA of FIG. 2 in an embodiment where the refrigerator 1 is mounted so that the lighting module 12 is in direct contact with a predetermined position on the inner surface of the storage chamber 6. It is a figure which shows a schematic state typically. In the example of FIG. 13, the lighting module 12 is attached and fixed to the bottom portion 56 of the immersion portion 55 with the fixing material 63 through the fixing material 63 in the through hole 44 of the heat radiating plate 38.

  As described above, the refrigerator 1 may be provided with the shelf board 10 and the drawer 11 in the storage chamber 6. In the refrigerator 1 having the shelf board 10 as described above, as shown in FIGS. 1 and 2, the lighting module 12 is located in front of the front end 51 of the shelf board 10 in the side view of the refrigerator 1 and is a storage room. 6 is preferably attached at a predetermined position on the rear side of the front end 52 of the inner surface. When the illumination module 12 is attached at such a predetermined position, there is a risk that the light directed from the illumination module 12 into the storage chamber 6 may be blocked by the shelf board 10 when entering the storage chamber 6. Can be suppressed. The side view of the refrigerator 1 indicates a case where the direction from one inner wall 50 to the other inner wall 50 of the refrigerator 1 is the viewing direction.

(Preferred form of the installation position and form of the illumination module 12)
In the illumination module 12, the short direction of the light guide plate 14 (arrow W in FIG. 6) and the vertical direction of the refrigerator 1 (arrow Q in FIG. 6) intersect at a predetermined position on the inner wall 50 in the storage chamber 6. It is positioned and attached so as to be (non-parallel). Then, it becomes easy to position the predetermined position close to the light receiving surface 16 in the light emitting surface 19 closer to the upper and lower ends than the center in the vertical direction of the storage chamber 6, and more effectively on the upper and lower ends of the storage chamber 6. Illuminance at the corners can be secured. In addition, when the interior of the storage chamber 6 is illuminated with a light source group in which a plurality of point light sources are arranged in a vertical direction at a predetermined position on the inner surface of the storage chamber 6 or a light source group in which a plurality of linear light sources are arranged in a vertical direction, The illumination module 12 may cause the refracted light of the light source 13 to be refracted light of the light guide plate 14 as a light emitting surface 19, although there may be a variation in illuminance in the vertical direction that is the juxtaposed direction in the space in the storage chamber 6. Since the light is emitted outward from the whole, it is easy to suppress the possibility of uneven illumination in the vertical direction.

  From the viewpoint of more efficiently realizing the effect of brightening the corners on the upper and lower ends of the storage room 6, the lighting module 12 is mounted such that the longitudinal direction of the light guide plate 14 coincides with the vertical direction of the refrigerator 1. Preferably it is. And the illumination module 12 attached in this way forms light-receiving surfaces 16 and 16 on both side surfaces 15 and 25 along the short direction of the light guide plate 14, respectively, and faces the respective light-receiving surfaces 16 and 16. In the case where the light sources 13 and 13 are arranged together, it is possible to brighten more reliably in any space on the upper and lower ends of the storage chamber 6.

(Position of the light source 13 of the illumination module 12)
With respect to the position of the light source 13 of the illumination module 12 when the illumination module 12 attached to the refrigerator 1 has one light receiving surface 16 on the side surface 15 side, the light source 13 is above the light receiving surface 16 in the vertical direction of the refrigerator 1. The light source 13 is preferably positioned below the light receiving surface 16 in the vertical direction of the refrigerator 1. When the light source 13 is positioned below the light receiving surface 16 in the vertical direction of the refrigerator 1, the illumination module 12 generates a positional shift of the light guide plate 14 in the downward direction due to the weight of the light guide plate 14, and the light source 13 and the light receiving surface. It is difficult for the state in which the distance from 16 is widened.

(Number of installed lighting modules 12)
When the lighting module 12 is attached to the inner wall 50 in the storage chamber 6, the lighting module 12 is arranged at a predetermined position on at least one inner wall 50 of the left and right inner walls 50, 50 in the storage chamber 6. However, it is preferable that the storage chamber 6 is attached at predetermined positions on both the left and right inner side walls 50, 50. If attached to both the left and right inner walls 50, 50, the illuminance balance between the left and right spaces in the space inside the storage chamber 6 can be further improved.

(Direction of the light source 13 and the light emitting surface 19 of the illumination module 12)
In the refrigerator 1, the light source 13 provided in the illumination module 12 is disposed with the light source light emitting surface 30 facing the light receiving surface 16, so that the light emitted from the light source 13 is directed toward the light receiving surface 16 and the light guide plate. 14 is incident light. Next, at least a part of incident light propagates through the light guide plate 14 and is reflected at an appropriate position to become reflected light, and at least a part of the reflected light is directed to the light emitting surface 19 side. Thereafter, in the refrigerator 1, the reflected light exits from the light emitting surface 19 to become outgoing light, and the outgoing light travels toward the inside of the storage chamber 6 to illuminate the space in the storage chamber 6. As shown in FIG. 6A, the light emitting surface 19 extends in the longitudinal direction of the light guide plate 14, and the emitted light can illuminate the inside of the storage chamber 6 of the refrigerator 1 almost entirely.

  In the refrigerator 1, it is preferable that the light emitting surface 19 of the illumination module 12 is oriented obliquely with respect to the front-rear direction (depth direction) in the storage chamber 6 and toward the back side in the storage chamber 6. The light emitting surface 19 of the illumination module 12 is inclined with respect to the front-rear direction (depth direction) in the storage chamber 6. The normal direction of the light emitting surface 19 intersects with the depth direction of the storage chamber 6 obliquely. Indicates to do. According to such a refrigerator 1, the reflected light emitted from the light emitting surface 19 as described above is easily directed toward the back of the storage room 6 (in the direction of arrow F), and the space on the back side of the storage room 6 is brightened more effectively. can do. As shown in FIG. 8B, this can be specifically realized by adjusting the position of the holding portion 66 by a heat radiating plate holding portion 64 described later, for example. In the example of FIG. 8B, the heat sink fixing legs 65, 65 of the heat sink fixing legs 65, 65 constituting the heat sink holding section 64 are on the front side of the storage chamber 6. It is configured to be closer to the bottom 56 side of the immersion portion 55 than the holding portion 66 of the radiator plate fixing leg 65.

(Immersive part 55)
As shown in the examples of FIGS. 6 to 8A, FIG. 8B, FIG. 12A, FIG. Preferably it is. The immersion portion 55 is formed by making a predetermined position on the inner surface of the storage chamber 6 into a concave shape. This can be concretely realized by using, for example, a molded body in which a shape corresponding to the shape of the immersive portion 55 is formed in a portion corresponding to the immersive portion 55 as the interior body 48. 6 to 8A, 8B, and 12, the immersive portion 55 is formed on the inner wall 50, and in FIGS. 14A and 14B, the immersive portion 55 is formed on the ceiling portion 70. And the illumination module 12 is accommodated in the immersion part 55. FIG. If such an immersion part 55 is formed, it can avoid that the state where the illumination module 12 is arrange | positioned in the position protruded inside the storage chamber 6 is formed. Then, when taking out the stored item from the storage chamber 6 or putting the stored item in the storage chamber 6, it is possible to suppress the possibility that the lighting module 12 collides with the stored item and the stored item or the lighting module 12 is damaged. it can. In FIG. 12A, FIG. 12B, FIG. 12C, and FIG. 14, the description about the structure about the exterior body 47, the interior body 48, and the heat insulating material 49 is abbreviate | omitted for convenience of explanation.

  When the refrigerator 1 has a cover member 57 (described later) attached to the lighting module 12, the immersion portion 55 is preferably formed in a shape that allows the cover member 57 to be fitted. In this case, the cover member 57 can be firmly attached and fixed to the immersion portion 55. The fitting of the cover member 57 to the immersive portion 55 is such that the outer contour shape of the cover member 57 and the edge shape of the immersive portion 55 are aligned with each other, and the cover member 57 and the immersive portion 55 are locked. This can be realized by providing a locking structure.

  For example, in the examples of FIGS. 7 and 12, the opening shape of the immersion portion 55 is formed in a substantially rectangular shape that matches the outer peripheral shape of the cover member 57. Further, the cover member 57 is formed with an engaging portion 59 having an engaging claw 58 protruding outward, and the engaging portion 59 receives the engaging claw 58 at a predetermined position of the recessed portion 55. A receiving groove 60 is formed so as to be able to be locked. In this case, a locking structure that locks the cover member 57 and the immersion portion 55 can be formed by fitting the locking claw 58 into the receiving groove 60. In the example of FIG. 7, the locking portion 59 is formed upright from both longitudinal edges of the cover member 57 (edges opposite to each other in the longitudinal direction), and the receiving groove 60 is immersed. It is formed on the inner surface of the portion 55 facing the vertical direction. In the example of FIG. 12, the locking portion 59 is erected from a position slightly inward from both ends of the cover member 57 in the short direction, and the receiving groove 60 has both side surfaces facing the width direction of the immersion portion 55. (Both side surfaces extending in the longitudinal direction of the immersion part 55).

  In the refrigerator 1, as shown in the example of FIG. 12, the immersion portion 55 is provided with a step portion 61 on at least a part of the edge portion, and the step portion 61 has at least a part of the outer peripheral edge portion of the cover member 57. May be configured to face each other. In this case, the possibility that the cover member 57 may excessively enter the bottom 56 side in the immersion portion 55 can be more efficiently realized.

(Cover member 57)
As shown in the examples of FIGS. 1, 2, 6 to 8, and 12, the refrigerator 1 is provided with a light-transmissive cover member 57 so as to cover the light emitting surface 19 of the lighting module 12. It is preferable that When the cover member 57 is provided, it is possible to suppress the possibility that the stored items in the storage chamber 6 are in direct contact with the lighting module 12 and the lighting module 12 is damaged or soiled. The cover member 57 is not particularly limited as long as it has optical transparency, and is preferably made of resin.

  When the refrigerator 1 includes the cover member 57, the illumination module 12 is preferably fixed to the cover member 57. When the illumination module 12 is fixed to the cover member 57, an illumination unit formed by fixing the illumination module 12 to the cover member 57 is formed, and the illumination unit is attached to the refrigerator 1, whereby the cover member 57 in the illumination unit is formed. The workability improving effect of facilitating the work process of locking and fixing the refrigerator to the refrigerator 1 can be obtained.

(Fixing of the illumination module 12 to the cover member 57)
The structure for fixing the illumination module 12 to the cover member 57 is not particularly limited. 6 and 7, a through hole 44 is formed in the heat radiating plate 38 of the illumination module 12, and a boss portion 62 is provided in the cover member 57 at a position facing the through hole 44. When fixing the illumination module 12 to the cover member 57, the cover member 57 and the illumination module 12 are positioned so that the through hole 44 and the boss portion 62 face each other, and the boss portion 62 is formed from the through hole 44 side. A fixing material 63 such as a screw is passed toward the head. Thus, a structure for fixing the illumination module 12 to the cover member 57 is formed.

(Heat sink fixing part 64)
When the illumination module 12 includes the heat radiating plate 38, the lighting module 12 may be fixed to the cover member 57 by providing the heat radiating plate fixing portion 64 on the cover member 57. That is, as shown in FIGS. 8A, 8B, and 12A to 12C, in the refrigerator 1, the heat radiating plate fixing portion 64 is formed at a predetermined position of the cover member 57, and the cover member 57 is formed of the heat radiating plate fixing portion. 64 may hold the heat radiation plate 38 of the illumination module 12. The heat sink fixing portion 64 is composed of a pair of heat sink fixing legs 65 and 65 facing each other. The cover member 57 only needs to have at least one set of heat sink fixing legs 65, 65, but two or more sets of heat sink fixing legs 65, 65 may be formed. The heat radiation plate fixing legs 65, 65 are erected from a predetermined position in the surface on the surface side of the cover member 57 facing the illumination module 12. In the heat sink fixing part 64, it is preferable that the distance between the pair of heat sink fixing legs 65, 65 facing each other is slightly shorter than the width of the heat sink 38 in the short direction. In addition, a groove-like holding portion 66 is formed at a predetermined position on each of the heat sink fixing legs 65 and 65. At this time, the holding portion 66 may have a shape that can fit the end edges of the heat dissipation plate 38, and may be formed in a curved cross-sectional shape as in the example of FIG. It may be formed in a U-shaped cross section as in the example.

  In the case where the heat radiating plate fixing portion 64 is provided on the cover member 57, when fixing the lighting module 12 to the cover member 57, the edge of the heat radiating plate 38 of the lighting module 12 is aligned with the holding portion 66 of the cover member 57. A state in which the illumination module 12 is sandwiched between the cover member 57 is formed, and the illumination module 12 is locked and fixed to the cover member 57.

  When the refrigerator 1 is configured in this way, the structure for fixing the illumination module 12 to the cover member 57 can be formed by avoiding the use of the through holes 44 and the fixing material 63 described above, and the number of parts can be reduced. can do. Further, when different metal members are used as the fixing material 63 and the heat radiating plate 38, the fixing material 63 and the heat radiating plate 38 may cause corrosion due to contact of different metals. Such a possibility is also suppressed by being able to avoid use.

  For example, when the cover member 57 and the heat sink fixing portion 64 are formed of resin, the cover member 57 and the heat sink fixing portion 64 are integrally formed with resin. This can be realized by molding the product. In addition, even if the cover member 57 and the heat sink fixing portion 64 are prepared separately and the heat sink fixing portion 64 is fixed to a predetermined position of the cover member 57, the heat sink fixing portion 64 is attached to the cover member 57. The provided configuration can be realized.

(Light guide plate fixing part 67)
In the refrigerator 1, as shown in FIGS. 12A to 12C, the cover member 57 is provided with a light guide plate fixing portion 67, and the cover member 57 sandwiches the light guide plate 14 of the illumination module 12 with the light guide plate fixing portion 67. It may be. The shape of the light guide plate fixing portion 67 can be appropriately selected according to the shape of the light guide plate 14. In the example of FIG. 12, the light guide plate fixing portion 67 has a sandwiching portion 68 that matches the shape of the light guide plate 14 and is formed in a U-shape as a whole. In this example, two light guide plate fixing portions 67 are provided on the surface of the cover member 57 facing the illumination module 12 on the front and back surfaces with a space in the longitudinal direction of the cover member 57.

  The material which comprises the light-guide plate fixing | fixed part 67 is not specifically limited, You may form with resin etc. When the cover member 57 and the light guide plate fixing portion 67 are formed of resin, the cover member 57 and the light guide plate fixing portion 67 are integrally formed of resin in the same manner as described for the heat sink fixing portion 64. May be. In this case, it is possible to eliminate the need to fix the light guide plate 14 using the light guide plate fixing member 39 prepared separately, and it is possible to reduce the number of components. However, this does not prohibit the member constituting the light guide plate fixing portion 67 from being prepared separately from the cover member 57. In this case, the structure which provided the light-guide plate fixing | fixed part 67 in the cover member 57 is realizable because the member which comprises the light-guide plate fixing | fixed part 67 adheres to the predetermined position of the cover member 57. FIG.

  When the light guide plate fixing portion 67 is provided on the cover member 57, the light guide plate 14 of the illumination module 12 is fitted into the pinching portion 68 of the light guide plate fixing portion 67 of the cover member 57. Is sandwiched between the light guide plate 14 and the cover member 57.

  When the refrigerator 1 is configured in this manner, the relative position of the light guide plate 14 with respect to the cover member 57 is less likely to be displaced, and the relative positional relationship of the light emitting surface 19 with respect to the cover member 57 can be stabilized. .

  In the example of the cover member 57 in FIG. 12, the light guide plate fixing portion 67 is provided together with the heat sink fixing portion 64, but only one of the heat sink fixing portion 64 and the light guide plate fixing portion 67 is formed. May be.

[Light propagation path in refrigerator 1]
In the refrigerator 1, the light generated from the light source of the illumination module 12 propagates as follows to illuminate the storage room.

  In the illumination module 12, as shown in FIGS. 3A and 7, light emitted from the light source 13 (light emitted from the light source) travels toward the light receiving surface 16 of the light guide plate 14. In the example of FIG. 7, the light emitted from the light source travels in a direction approximately along the vertical direction of the refrigerator 1. Light emitted from the light source is incident from the light receiving surface 16 of the light guide plate 14 and becomes incident light (incident light Lin in FIGS. 3A and 7). At least a part of the incident light travels in the direction away from the light receiving surface 16 approximately inside the light guide plate 14. At this time, as the incident light Lin travels in the light guide plate 14 in a direction away from the light receiving surface 16, the total light is appropriately reflected between the back surface 20 side and the light emitting surface 19 side of the light guide plate 14 to become reflected light, As shown in FIG. 3C, part of the reflected light includes light traveling toward the reflective structure 21 formed on the back surface 20 side. At least a part of the light traveling toward the reflection structure 21 is appropriately reflected or refracted by the concave portions 22 constituting the reflection structure 21 to form reflected light toward the light emitting surface 19 formed on the light guide plate 14. Here, what does not cause total reflection occurs in at least a part of the reflected light Lre. At least a part of such reflected light Lre is emitted to the outside as the emitted light Lout from the light emitting surface 19 as shown in FIGS. 3A and 3C. Then, as shown in FIGS. 7 and 11, the emitted light Lout is propagated toward the inside of the storage chamber 6 and becomes light that illuminates the inside of the storage chamber 6.

[Illuminance of space in storage room 6]
When the illumination module 12 is incident on the light guide plate 14 from the light receiving surface 16, the luminance at a predetermined position near the light receiving surface 16 on the light emitting surface 19 is configured to be larger than the luminance at the center position of the light emitting surface 19. In this case, the refrigerator 1 can easily illuminate the non-corner corners of the storage chamber 6 and the corners in the space inside the storage chamber 6 with good balance. In the example of FIG. 11, the refrigerator 1 has an excellent illuminance balance between the non-corner corner portion (for example, the central portion Pce in FIG. 11) and the corner corner portion (boundary portion Pdi in FIG. 11) of the storage chamber 6. It becomes easy to become. In FIG. 11, the door 5 is not shown for convenience of explanation. The same applies to FIG.

  Next, the present invention will be described in more detail using examples.

Examples 1 to 3
[Preparation of light guide plate]
First, a light guide plate was prepared as shown below.

(Preparation of resin sheet)
As a resin sheet constituting the light guide plate, a resin sheet material made of a copolymer of styrene and (meth) acrylic compound having a rectangular shape of 40 cm long × 2 cm wide × 3 mm thick was prepared. One side of the front and back surfaces of the resin sheet is the surface facing the light emitting surface side (light emitting surface planned surface), and is a side surface extending in the short direction of the resin sheet and opposite to the longitudinal direction of the resin sheet. Both side surfaces located at the end positions were determined in advance as surfaces (light-receiving surface planned surfaces) forming a light-receiving surface.

(Formation of reflection structure)
Of the front and back surfaces of the resin sheet, the back surface side opposite to the light emitting surface planned surface is irradiated with a carbon dioxide laser under the conditions of a wavelength of 10600 nm and an irradiation energy of 1 KW using a laser device (manufactured by Lighting Earth). A dot-like recess was formed. A large number of recesses were formed so as to form a grid-like arrangement pattern arranged vertically and horizontally, such as the arrangement pattern of the recesses shown in the example of FIG. At this time, the recessed part row | line | column which aligned in the transversal direction of the resin sheet by the several recessed part was formed, and also the recessed part group formed by arrange | positioning a recessed part row | line at intervals in the longitudinal direction of the resin sheet was formed. The size of each dot was set to the same size. The arrangement interval (mm) between the adjacent recess rows was set as follows. First, the back surface of the resin sheet is equally divided into three regions so as to be arranged in the longitudinal direction of the resin sheet, and the first region, the second region, The third zone. At this time, the position directly behind the center position of the light emitting surface planned surface is located in the second region. For the first region, the second region, and the third region, the arrangement intervals of the adjacent recess rows were set as shown in Table 1.

[Preparation of lighting module]
A light reflecting sheet and a heat radiating plate are arranged on the back side of the light guide plate, and a light source is arranged facing each of the two light receiving surfaces of the light guide plate and fixed to the heat radiating plate, resulting in a configuration as shown in FIG. A module was prepared.

  RF188 manufactured by Tsujiden Co., Ltd. was used as the light reflecting sheet. As for the light source, a light source member was prepared in which a plurality of light emitting elements were embedded in a fixed material at a predetermined interval. In addition, LED was used for the light emitting element.

[Preparation of test structure]
As a model structure of the refrigerator storage room, prepare a case (test case) that opens to one side in the same way as the storage room, and within the inner wall on the left side of the inner surface of the test case toward the opening of the test case And the illumination module was attached to the opening vicinity position of a test housing | casing, and the test structure was obtained.

  At this time, the illumination module was positioned and placed in the test casing so that the longitudinal direction of the light guide plate was aligned with the vertical direction of the test casing.

  Using each lighting module prepared in Examples 1 to 3, test structures for each of Examples 1 to 3 were prepared as follows.

[Illuminance confirmation test]
Using the test structures prepared for each of Examples 1 to 3 as described above, an illuminance confirmation test was performed.

(Illuminance measurement test in a space close to the light emitting surface)
The illuminance of the space adjacent to the light emitting surface (light emitting surface adjacent space illuminance) (lx) was measured as follows. That is, the light source of the illumination module is turned on and light is incident on the light guide plate, and the central position of the light emitting surface and the position near the predetermined position near the light receiving surface of the light emitting surface are along the normal direction of the light emitting surface. The illuminance near the light emitting surface was specified by measuring the illuminance of the space portion 15 mm away from the light emitting surface in the vertical direction. Therefore, as the light emitting surface proximity space illuminance, the light emitting surface adjacent space illuminance (Vc) about the center position of the light emitting surface (the position where the light emitting surface is divided into two in the short direction and the longitudinal direction), The light emitting surface proximity space illuminance (Vk) was measured for a position near a predetermined position near the light receiving surface. The position near the predetermined position of the light emitting surface near the light receiving surface is a position on a straight line that bisects the light emitting surface in the short direction, and slightly from the predetermined position near the light receiving surface of the light emitting surface to a slightly central position. The heading position (the inner position by 1/8 of the length of the light guide plate in the longitudinal direction) was selected. At this time, the light-emitting surface proximity space illuminance (Vk) at a position near a predetermined position near the light-receiving surface of the light-emitting surfaces was an average value of the illuminance measured for each light-receiving surface. The illuminance ratio (light emitting surface proximity space illuminance ratio) (Vk / Vc) was calculated using these values. The results are shown in Table 2. Here, in the portion of the light emitting surface where the surface brightness is high, the light emitting surface adjacent space illuminance is high in the space portion in the vicinity thereof, so the calculated illuminance ratio reflects the surface luminance of the light emitting surface. Yes. In general, the illuminance at a position near a predetermined position near the light receiving surface in the light emitting surface is approximately equal to the illuminance at a predetermined position near the light receiving surface among the light emitting surfaces. For this reason, the calculated light emitting surface proximity space illuminance ratio reflects the magnitude relationship between the luminance at the center of the light emitting surface and the luminance at a predetermined position near the light receiving surface of the light emitting surface. In addition, the illuminance meter (The Topcon Techno House Co., Ltd. make, a digital illuminometer (IM-600)) was used for the measurement of light emission surface adjacent space illumination intensity. This is also the same as the measuring machine used for illuminance measurement in the case internal space illuminance measurement test described later.

(Illuminance measurement test inside the test enclosure)
With respect to the illuminance in the internal space of the test casing, the illuminance (lx) at the corners and non-corner corners of the test casing was measured. In the test case, the corners to be measured for illuminance are side surfaces on the inner side of the test case as portions selected from the boundary portions specified in the same manner as the portions corresponding to the boundary portions Pdi in FIG. Among them, the part corresponding to the boundary between the installation surface and the back surface of the lighting module was selected. For the non-corner corner, a portion corresponding to the center in the left-right direction of the inner surface of the test casing was selected. The illuminance (Ak) at the corners was specified as follows. Measure the illuminance at each measurement point using the three corners of the corner, the upper end position, the center position (vertical direction center position), and the position between the upper end position and the center position. Their average value was calculated. This average value was taken as the illuminance (lx) at the corners. As for the illuminance (Ac) at the non-corner corner, as in the corner corner, the upper end position, the center position (vertical center position), and the position between the upper end position and the center position of the non-corner corner are 3 The illuminance was measured at each measurement point, and the average value thereof was defined as the illuminance (lx) at the non-corner corner. The illuminance ratio (corner corner non-corner corner illuminance ratio) (Ak / Ac) was calculated. The results are shown in Table 2. In all of Examples 1 to 3, it is confirmed that both the corner and non-corner corners are illuminated with sufficient brightness, and that the interior of the test casing is entirely illuminated. Further, in Example 3, it is confirmed that the value of the illuminance ratio Ak / Ac is close to 1, and the internal space of the test casing is illuminated with a better balance.

DESCRIPTION OF SYMBOLS 1 Refrigerator 2 Refrigerator main body 3 Opening part 4 Heat insulation housing 5 Door 6 Storage room 7 Vegetable room 8 Freezing room 9 Drawer structure 10 Shelf board 11 Drawer 12 Illumination module 13 Light source 14 Light guide plate 15 Side surface of light guide plate 16 Light receiving surface 18 Guide One surface of the front and back surfaces of the light plate 19 Light emitting surface 20 Back surface of the light guide plate 21 Reflective structure 22 Recess 23 Recess group 24 Recess row 25 Side surface of the light guide plate 27 Light reflecting pattern layer 28 Light reflecting pattern layer forming unit 30 Light source emitting surface 31 Light emission Element 32 Light source member 33 Fixed body 34 Sealing portion 35 Base portion 36 Reflective material 37 Light reflecting sheet 38 Heat radiating plate 39 Light guide plate fixing member 40 Holding portion 41 Fixing portion 42 Flat plate portion 43 Extending wall portion 44 Through hole 45 Buffer material 46 Position adjustment sheet 47 Exterior body 48 Interior body 49 Heat insulating material 50 Inner side wall of storage chamber 51 Front end of shelf 52 52 of storage chamber Front end of inner surface 55 Immersion portion 56 Bottom portion of immersion portion 57 Cover member 58 Locking claw 59 Locking portion 60 Receiving groove 61 Step portion 62 Boss portion 63 Fixing material for fixing cover member and heat sink 64 Heat sink plate fixing portion 65 Heat sink Fixed leg 66 Holding part 67 Light guide plate fixing part 68 Clipping part 70 Ceiling part 71, 72 Boundary 73 Back wall 74 Spacer

Claims (6)

A refrigerator in which a lighting module including a light source and a light guide plate is attached to a storage room,
In the illumination module, a light receiving surface is formed on at least one side surface of the light guide plate formed in a strip shape along the short side direction, and a light source is disposed facing the light receiving surface. The light incident on the light plate is configured to be emitted from one side of the front and back surfaces of the light guide plate to form a light emitting surface on the one surface, and the light emitting surface faces the inside of the storage chamber, The refrigerator characterized by being arrange | positioned in the predetermined position of the inner surface in a storage chamber so that the longitudinal direction of a light-guide plate may cross | intersect with respect to the depth direction of a storage chamber.   2. The structure according to claim 1, wherein when light enters the light guide plate from the light receiving surface, the luminance at a predetermined position near the light receiving surface on the light emitting surface is equal to or higher than the luminance at the center position of the light emitting surface. The refrigerator described.   The illumination module has a reflecting structure formed on a back surface opposite to the light emitting surface of the front and back surfaces of the light guide plate, and includes a light reflecting sheet facing the back surface. 2. The refrigerator according to 2.   4. The illumination module according to claim 1, wherein the illumination module includes a heat radiating plate on the outermost side opposite to the light emitting surface of the front and back surfaces of the light guide plate, and the light source is fixed to the heat radiating plate. refrigerator. A cover member having light transmittance is attached so as to cover the light emitting surface of the lighting module,
The refrigerator according to any one of claims 1 to 4, wherein the illumination module is fixed to the cover member.   The illumination module has a light receiving surface formed on one side surface extending in a short direction of the light guide plate, and a reflecting material and a buffer material are provided in this order on the opposite end surface side with respect to the one side surface. The refrigerator according to crab.

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