Abstract:
An object is to provide a showcase provided with an illumination device capable of simplifying maintenance operability and effectively illuminating the inside of a display chamber, and the showcase in which the display chamber constituted in a main body is illuminated by the illumination device, the illumination device is constituted of an LED illumination member including LED elements, and a pair of holding members which are attached to a reflective plate on a canopy in the main body to hold the LED illumination member, whereby the irradiation angle of light from the LED illumination member is changeable.

Description:
BACKGROUND OF THE INVENTION 
     The present invention relates to a showcase in which a display chamber is constituted in an insulation wall and in which commodities are displayed in the display chamber while cooling the commodities. More particularly, it relates to illumination in a display chamber. 
     Heretofore, as this type of showcase, there is an open showcase  100  as disclosed in, for example, Japanese Patent Application Laid-Open No. 5-146346 (the patent document) and as shown in  FIG. 18 .  FIG. 18  is a vertical side view showing the conventional open showcase  100 . In the open showcase  100 , cold air is discharged to a suction port  104  formed in the lower edge of an opening  102  from a discharge port  103  formed in the upper edge of the opening  102  in an insulation wall  101  having a substantially U-shaped section, whereby a cold air curtain is formed in the opening  102 . In consequence, the inside of a display chamber  105  surrounded with the insulation wall  101  is cooled at a predetermined temperature. Then, a plurality of fluorescent lamps  108  are attached to a canopy  107  positioned outside the upper edge of the opening  102 , the opposite side edges of the opening  102 , the lower surfaces of the front parts of shelves  106  and the like, to illuminate the display chamber  105  and the showcase  100  itself. 
     However, in the conventional open showcase  100 , the fluorescent lamps  108  used as illumination devices are obliged to be replaced owing to the lowering of luminance and a lighting defect due to deterioration with an elapse of years. Therefore, a user is forced to perform the replacement operation of the fluorescent lamps  108 , which causes a problem that the operation becomes laborious. A new fluorescent lamp  108  for the replacement needs to be stocked, and the storage place of the fluorescent lamp  108  needs to be secured. Furthermore, the fluorescent lamp  108  contains mercury, so that there is a problem that the used fluorescent lamp  108  cannot easily be discarded. 
     Moreover, to attach the fluorescent lamp  108  in the display chamber  105 , components such as a socket and a stabilizer are required, and hence the attachment places of not only the fluorescent lamps but also the sockets, the stabilizers and the like need to be secured in attachment positions. Furthermore, wires have to be connected so as to supply powers to the respective fluorescent lamps, whereby there are problems that assembly operability deteriorates and that the increase of the number of the components and the steep rise of production cost are caused. In addition, the fluorescent lamp has a problem that the lamp flickers owing to the use of an alternate current, and hence eyes are adversely affected. 
     SUMMARY OF THE INVENTION 
     The present invention has been developed in order to solve a conventional technical problem, and an object thereof is to provide a showcase including an illumination device capable of simplifying a maintenance operation and effectively illuminating a display chamber. 
     According to the present invention, there is provided a showcase in which a display chamber constituted in a main body is illuminated by an illumination device, characterized in that the illumination device is constituted of an LED illumination member including LED elements, and a holding member which is attached to the main body to hold the LED illumination member, and the irradiation angle of light from the LED illumination member is changeable. 
     According to this invention, there is provided the showcase in which the display chamber constituted in the main body is illuminated by the illumination device, wherein the illumination device is constituted of the LED illumination member including the LED elements, and the holding member which is attached to the main body to hold the LED illumination member, and the irradiation angle of the light from the LED illumination member can be changed, whereby the irradiation light rectilinearly coming in parallel from the LED elements can be directed in an arbitrary direction. Therefore, the angle can be changed toward a necessary irradiation position in accordance with a position where the illumination device is attached. 
     In consequence, even when the illumination devices are attached to the canopy of the main body, shelves and the like, a satisfactory illumination effect can be realized. 
     Moreover, the LED illumination device does not radiate any harmful ultraviolet ray or heat ray to commodities displayed in the display chamber, so that the commodities can be illuminated without being heated as compared with conventional fluorescent lamps. 
     Furthermore, the showcase of the present invention is characterized in that in the above invention, the LED illumination member is rotated around the axis of the LED illumination member in a longitudinal direction with respect to the holding member, whereby the irradiation angle of the light from the LED illumination member is changeable. 
     According to this invention, in the above invention, the LED illumination member is rotated around the axis of the LED illumination member in the longitudinal direction with respect to the holding member, whereby the irradiation angle of the light from the LED illumination member can be changed. Therefore, the irradiation angle from the LED Illumination member can easily be changed. 
     Moreover, the showcase of the present invention is characterized in that in the above invention, a pair of holding members corresponding to the opposite ends of the LED illumination member in the longitudinal direction are provided, the LED illumination member includes attachment portions which are provided on the opposite ends of the LED illumination member in the longitudinal direction and which are inserted into and held in the holding member, and an engaging portion formed on one of the attachment portion and the holding member is selectively engaged with one of a plurality of portions to be engaged formed on the other one of the attachment portion and the holding member, whereby the irradiation angle of the light from the LED illumination member is changeable. 
     According to this invention, in the above invention, the pair of holding members corresponding to the opposite ends of the LED illumination member in the longitudinal direction are provided, the LED illumination member includes the attachment portions which are provided on the opposite ends of the LED illumination member in the longitudinal direction and which are inserted into and held in the holding members, and the engaging portion formed on one of the attachment portion and the holding member is selectively engaged with one of the plurality of portions to be engaged formed on the other one of the attachment portion and the holding member, whereby the irradiation angle of the light from the LED illumination member can be changed. Therefore, the irradiation angle of the light emitted by the LED illumination member can stably be held. In consequence, appropriate commodity illumination can be maintained. 
     Moreover, the showcase of the present invention is characterized in that in the above inventions, the LED illumination member includes a substrate provided with the LED elements, a heat release member, and a reflective plate which is engaged with and attached to the heat release member and which has at least one reflective surface, and the reflective plate presses the substrate onto the heat release member in a state in which the LED elements are opposed to the side of the reflective surface. 
     According to this invention, in the above inventions, the LED illumination member includes the substrate provided with the LED elements, the heat release member, and the reflective plate which is engaged with and attached to the heat release member and which has at least one reflective surface, and the reflective plate presses the substrate onto the heat release member in the state in which the LED elements are opposed to the side of the reflective surface. In consequence, it is possible to easily hold the substrate provided with the LED elements without using any fixing member such as a screw, and the number of components can be reduced. 
     Furthermore, the heat release member is pressed onto and attached to the substrate, so that heat generated from the substrate can efficiently be released, and smooth illumination can be realized. 
     In addition, according to the showcase of the present invention, in the above invention, the outer surface of the heat release member has a circular shape around the axis of the LED illumination member in the longitudinal direction. 
     According to this invention, in the above invention, the outer surface of the heat release member has the circular shape around the axis of the LED illumination member in the longitudinal direction, whereby the angle adjustment performed by the rotation of the LED illumination member can be carried out without any trouble. 
     Moreover, the showcase of the present invention is characterized in that in the above inventions, the holding member includes an attachment leg portion which is engageable with an attachment hole in a socket for a fluorescent lamp formed in the main body. 
     According to this invention, in the above inventions, the holding member includes the attachment leg portion which is engageable with the attachment hole in the socket for the fluorescent lamp formed in the main body, so that even in the existing showcase in which a display chamber is illuminated with the fluorescent lamp, the holding member can be attached using the attachment hole of the socket for the fluorescent lamp used in attaching the fluorescent lamp, and versatility can be enlarged. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view showing an open showcase to which the present invention is applied; 
         FIG. 2  is a vertical side view showing the open showcase of  FIG. 1 ; 
         FIG. 3  is a partially enlarged sectional view of  FIG. 2 ; 
         FIG. 4  is a plan view showing an LED illumination member; 
         FIG. 5  is a partially sectional view showing a state in which one side portion of the LED illumination member is attached to the holding member; 
         FIG. 6  is a vertically sectional view showing the LED illumination member; 
         FIG. 7  is an exploded perspective view showing a reflective plate and LED elements in the LED illumination member; 
         FIG. 8  is a side view showing an attachment portion in the LED illumination member; 
         FIG. 9  is a front view similarly showing the attachment portion; 
         FIG. 10  is a vertically sectional view showing the LED illumination member; 
         FIG. 11  is a partially perspective side view showing the holding member; 
         FIG. 12  is a front view showing the holding member; 
         FIG. 13  is a vertically sectional view showing the LED illumination member held by the holding member; 
         FIG. 14  is a vertically sectional view showing the LED illumination member held by the holding member; 
         FIG. 15  is a vertically sectional view showing the LED illumination member held by the holding member; 
         FIG. 16  is a vertically sectional view showing an LED illumination member as another embodiment; 
         FIG. 17  is a vertically sectional view showing an LED illumination device provided on the lower surface of a shelf plate; 
         FIG. 18  is a vertical side view of a conventional open showcase; 
         FIG. 19  is a side view of a second embodiment showing an attachment portion in the LED illumination member; and 
         FIG. 20  is a partially perspective side view of the second embodiment showing the holding member. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Next, embodiments of the present invention will be described in detail with reference to the drawings.  FIG. 1  is a perspective view showing an open showcase  1  to which the present invention is applied, and  FIG. 2  is a vertical side view showing the open showcase  1  of  FIG. 1 , respectively. The open showcase  1  is a vertical type open showcase installed in a store such as a supermarket, and the showcase is constituted of an insulation wall (a main body)  2  having a front surface opened and substantially having a U-shaped section, and insulation side plates  5 ,  5  attached to the side surfaces of the insulation wall  2 . 
     On the inner side of the insulation wall  2  of the open showcase  1 , a partition plate  4  and another partition plate (not shown) are attached with spaces from the wall, respectively, and a duct including two inner and outer layers (not shown) is formed between the partition plate  4  and the like and the insulation wall  2 . A bottom plate  9  is attached to the front portion of the lower end of the inner partition plate  4  with a space for a duct provided between the bottom plate and a bottom wall  2 A of the insulation wall  2 , and a display chamber  11  is disposed on the inner side of the partition plate  4  and the bottom plate  9 . 
     Moreover, in the display chamber  11 , there are extended a plurality of stages each including a pair of brackets  31  having a height and an attachment angle which can be changed and attached to a support (not shown) in the back part of the display chamber  11 , and a shelf plate  32  constituting a shelf together with these brackets. Price rails  34  formed of a hard synthetic resin are attached to the front edges of the shelf plates  32 , and the price rails  34  also serve as decorative members for the shelf plates  32 . Furthermore, a predetermined space is formed between the front walls of the shelf plates  32  and the price rails  34 , and guards  35  for preventing commodities from dropping down from the shelf plates  32  are attached in the space. 
     On the upper edge of a front opening  12  in the insulation wall  2 , an inner discharge port  16  and an outer discharge port  17  provided with honeycomb members  13 ,  14 , respectively, are arranged. The inner discharge port  16  and the outer discharge port  17  communicate with an inner duct and an outer duct, respectively. Moreover, an inner suction port  18  and an outer suction port  19  are arranged in the lower edge of the opening  12 . 
     On the other hand, blowers  30 A,  30 B corresponding to the inner duct and the outer duct, respectively, are installed on the bottom wall  2 A of the insulation wall  2  in a rear part under the bottom plate  9 . 
     A cooler  39  for a cooling device is vertically provided in the inner duct behind the back partition plate  4 . In a case where the blower corresponding to the inner duct is operated, cold air which has performed heat exchange between the air and the cooler is raised through the inner duct, and discharged from the inner discharge port  16  to the inner suction port  18 . Then, the cold air sucked from the inner suction port  18  is accelerated by the blower. 
     On the other hand, when the blower corresponding to the outer duct is operated, the air in the outer duct is raised through the outer duct, and discharged from the outer discharge port  17  to the outer suction port  19 . Then, the cold air sucked from the outer suction port  19  is accelerated by the blower. In consequence, double front and rear air curtains are formed in the opening  12 , and a part of the inner cold air curtain is circulated through the display chamber  11  to cool the display chamber  11 . 
     Next, the constitution of the front part of a ceiling wall  2 B of the insulation wall  2  will be described with reference to the partially enlarged sectional view of the showcase  1  in  FIG. 3 . A canopy  33  which protrudes forwards is attached to the front end (the upper part front end) of the ceiling wall  2 B of the insulation wall  2 . On the inner side of this canopy  33 , a reflective plate  45  is attached so as to extend externally from the front opening  12  of the display chamber  11 . 
     This reflective plate  45  is constituted of a decorated metal plate, and the front portion of the reflective plate  45  in the present embodiment is constituted at an angle opposed to the front opening  12  of the display chamber  11  from an upper front part, that is, so as to face the display chamber  11  which is disposed obliquely rearwards under the reflective plate. Then, illumination attachment holes  41  for detachably attaching a holding member  42  of an LED illumination device  40  are formed in the left and right side portions of the front part. It is to be noted that in the present embodiment, the LED illumination device  40  is attached so as to extend in a longitudinal direction from one side portion to the other side portion of the front opening  12  of the display chamber  11 , so that the illumination attachment holes  41  are formed in the left and right side portions, respectively, but the present invention is not limited to this example. In a case where a plurality of LED illumination devices  40  are arranged in series over the longitudinal direction of the front opening  12 , the illumination attachment holes  41  may be formed in positions corresponding to the side portions of the respective LED illumination devices  40 . 
     In the present embodiment, the LED illumination device  40  is constituted of an LED illumination member  43 , and the holding member  42  which detachably holds the LED illumination member  43 . The LED illumination device  40  according to the present invention will hereinafter be described in detail with reference to  FIGS. 4 to 15 .  FIG. 4  is a plan view showing the LED illumination member  43 ,  FIG. 5  is a partially sectional view showing a state in which one side portion of the LED illumination member  43  is attached to the holding member  42 ,  FIG. 6  is a vertically sectional view showing the LED illumination member  43 ,  FIG. 7  is an exploded perspective view showing a reflective plate and LED elements in the LED illumination member  43 ,  FIG. 8  is a side view showing an attachment portion  44  in the LED illumination member  43 ,  FIG. 9  is a front view similarly showing the attachment portion  44 ,  FIG. 10  is a vertically sectional view showing the LED illumination member  43 ,  FIG. 11  is a partially perspective side view showing the holding member  42 ,  FIG. 12  is a front view showing the holding member  42 , and  FIGS. 13 to 15  are vertically sectional views showing the LED illumination member  43  held by the holding member  42 , respectively. 
     The LED illumination member  43  is constituted of a substrate  47  provided with a plurality of LED elements  46 , a heat release member  48 , a reflective plate  49  and the attachment portion  44 . The substrate  47  is constituted so as to extend in the longitudinal direction, and the plurality of LED elements  46  are attached to the substrate  47  at predetermined intervals as shown in  FIG. 7 . The LED elements  46  of the present embodiment are chip type white LED elements. In the present embodiment, the front opening  12  of the open showcase  1  is formed to extend as much as six shaku (about 1830 mm), so that about 108 LED elements  46  are used. 
     The heat release member  48  is a thermally conductive member formed to extend in the longitudinal direction of the front opening  12  in the same manner as in the substrate  47 . An outer surface  48 A has a circular shape around the longitudinal axis (a rotation axis X described later) of the LED illumination member  43 , and is provided with a plurality of slits  48 D directed internally from the outer surface. 
     Then, in the end face of the heat release member  48  on a side on which a chord is constituted with respect to this circular outer surface  48 A, a substrate receiving portion  48 B is recessed inwards and formed over the longitudinal direction. Engagement claws  48 C,  48 C slightly protruded toward the rotation axis X are formed in upper end edges positioned substantially in parallel with the rotation axis X of this substrate receiving portion  48 B. Moreover, on the end face of the heat release member on the side on which the chord is constituted with respect to the circular heat release member  48 , a shade  50  constituted of a light-blocking colorless transparent material for covering the outer surface of the substrate receiving portion  48 B is detachably attached. 
     Then, the substrate receiving portion  48 B of the heat release member  48  receives the reflective plate  49  provided with the substrate  47 . The reflective plate  49  is a plate-like member formed over the longitudinal direction in the same manner as in the substrate  47 , and the plate is provided with a plurality of LED element holes  49 A . . . over the longitudinal direction. Then, the opposite ends of the reflective plate  49  provided with the LED element holes  49 A in the longitudinal direction are reflective surfaces  49 B bent at a predetermined angle toward a light irradiation side shown in  FIG. 7 , that is, toward the display chamber  11  in the present embodiment. The reflective surfaces  49 B are provided with a plurality of notches  49 C directed externally at predetermined intervals. 
     According to such a constitution, the substrate  47  provided with the LED elements  46  is attached to the surface of the reflective plate  49  opposite to the light irradiation side of the reflective plate, and the LED elements  46  are opposed to the side of the reflective surfaces  49 B (the light irradiation side) via the LED element holes  49 A formed in the reflective plate  49 . The reflective plate  49  having this state is received in the substrate receiving portion  483  of the heat release member  48 , and both the ends of the substrate receiving portion  48 B of the reflective plate  49  are engaged with the engagement claws  48 C formed on the upper edge of the substrate receiving portion  48 B. At this time, both the ends of the reflective plate  49  are bent at a predetermined angle with respect to the surface provided with the LED element holes  49 A, whereby the reflective surfaces  49 B engage with the engagement claws  48 C to press, onto the circular heat release member  48 , the surface of the reflective plate provided with the LED element holes  49 A, that is, the surface of the reflective plate provided with the substrate  47 . It is to be noted that the reflective surfaces  49 B are provided with a plurality of notches  49 C as described above, and hence can easily be engaged with the engagement claws  48 C. 
     In consequence, the substrate  47  provided with the LED elements  46  can easily be held by the heat release member  48  without using any fixing member such as a screw, and the number of compositions can be reduced. Then, the substrate  47  pressed onto the heat release member  48  is attached, whereby the heat of the substrate  47  generated by light emitted from the LED elements  46  can efficiently be transmitted to the heat release member  48 , and released, and smooth illumination can be realized. 
     Then, the attachment portions  44  are fixed by screws  44 A,  44 A to both the ends of the heat release member  48  provided with the substrate  47  in the longitudinal direction as described above. It is to be noted that reference numerals  48 E,  48 E in  FIG. 6  are screw holes for attaching the attachment portion  44  to the heat release member  48  with the screws  44 A. This attachment portion  44  is constituted of a main body  51  having a semicircular outer shape so as to close either end of the heat release member  48 , and an attachment portion  52  provided on the outer surface of the main body  51  (on a side opposite to the side provided with the LED illumination member  43 , that is, the side of the holding member  42  described later). 
     In the present embodiment, the attachment portion  52  substantially has a circular section, and the center of the circle is substantially the same as that forming the heat release member  48 . It is also constituted that the rotation axis of the attachment portion  52  is substantially similar to the axis X. Then, the outer surface of the attachment portion  52  is provided with engagement grooves  53  at each predetermined angle of, for example, 30° with respect to the axis X It is to be noted that in the present embodiment, as shown in  FIG. 8 , seven engagement grooves  53  A 1  to A 7  are formed, and these grooves are positioned on the light irradiation side of the LED elements  46  of the LED illumination member  43 . It is to be noted that these engagement grooves  53  constitute a portion to be engaged for detachably engaging with an engaging portion  58  of the holding member  42  described later. 
     Moreover, this attachment portion  52  is provided with a wire drawing hole  52 A which connects the substrate receiving portion  48 B of the heat release member  48  to the outside. Therefore, the wire of the substrate  47  received in the substrate receiving portion  48 B is drawn outwards via the wire drawing hole  52 A, and the wire is connected to the inside of the main body  2 . 
     Next, the constitution of the holding member  42  will be described. A pair of holding members  42  corresponding to both the ends of the LED illumination member  43  in the longitudinal direction are provided, and are members for attaching the LED illumination member  43  to be provided on the main body  2  of the open showcase  1 , that is, the reflective plate  45  in the canopy  33 . Each of the holding members  42  in the present embodiment has a holding portion  55  which opens on the side of the LED illumination member  43  to be attached, attachment leg portions  56  provided with engagement claws  56 A to be attached to the illumination attachment holes  41  formed in the reflective plate  45  of the canopy  33 , and press plates  57 . 
     The holding portion  55  has a bottomed cylindrical shape which opens on the side of the LED illumination member  43 , and the inner wall surface of the holding portion is provided with the engaging portion  58  which protrudes inwards and which detachably engages with one of the engagement grooves  53  of the attachment portion  44 . It is to be noted that in the present embodiment, the engaging portion  58  is formed in such a position as to face an attachment side with respect to the insulation wall  2  side of the holding member  42 , specifically in a position on the light irradiation side of the LED illumination member  43 . Moreover, the inner side surface of the holding portion  55  is provided with a wire drawing hole  55 A which extends through the surface. It is to be noted that the holding portion  55  for use in the present embodiment is constituted of a material having a certain degree of flexibility. 
     It is to be noted that in the conventional open showcase, instead of the LED illumination device of the present invention, fluorescent lamps and the like are attached. In this case, sockets for detachably attaching the fluorescent lamps to the main body  2  are provided, and attachment holes for use as holes for attaching the sockets may be used as the illumination attachment holes  41  of the present invention. 
     A method for attaching the LED illumination device  40  of the present invention having such a constitution will be described. First, the engagement claws  56 A of the attachment leg portions  56  formed in the pair of holding members  42  as described above are inserted into and engaged with the illumination attachment holes  41  formed in the reflective plate  45  of the canopy  33 . Afterward, in a state in which the LED illumination member  43  including the LED elements  46 , the attachment portions  44  and the like as described above are directed into the display chamber  11  so that the light irradiation angle of the LED elements  46  is an arbitrary angle, the attachment portions  52  of the attachment portions  44  are inserted into the holding portions  55  of the holding members  42  provided corresponding to both the ends of the LED illumination member  43  in the longitudinal direction. Then, one of the engagement grooves  53  formed in the attachment portion  52  is detachably engaged with the engaging portion  58  formed in the holding portion  55  by use of the flexibility of the holding member  42 . 
     In consequence, the LED illumination member  43  can be fixed to the reflective plate  45  of the canopy  33  in a state in which the LED illumination member is held at an arbitrary angle. Moreover, in the present embodiment, when the light irradiation angle of the LED illumination device  40  is changed, the LED illumination member  43  is once removed from the holding members  42 , and the LED illumination member  43  is rotated around the rotation axis X of the member in the longitudinal direction, whereby the engagement groove  53  to be engaged with the engaging portion  58  of the holding portion  55  is selected, and the selected engagement groove  53  is engaged with the engaging portion  58 . In consequence, the irradiation angle of the light from the LED illumination member  43  can be changed. According to the constitution, the irradiation angle of the light from the LED illumination member  43  can stably be held, and appropriate commodity illumination can be maintained. 
     It is to be noted that  FIG. 13  shows a state in which as the engagement groove  53  to be engaged with the engaging portion  58  of the holding portion  55 , the engagement groove A 4  is used. In this case, the irradiation light from the LED elements  46  can be directed into the display chamber  11  from an angle substantially parallel to the surface of the reflective plate  45  to which the LED illumination member  43  is attached, to irradiate the display chamber.  FIG. 14  shows a state in which as the engagement groove  53  to be engaged with the engaging portion  58  of the holding portion  55 , the engagement groove A 3  is used. In this case, the light from the LED elements  46  can be directed so as to comparatively irradiate the front part of the display chamber  11  and a part in front of the chamber.  FIG. 15  shows a state in which as the engagement groove  53  to be engaged with the engaging portion  58  of the holding portion  55 , the engagement groove A 6  is used. In this case, the light from the LED elements  46  can be directed so as to comparatively irradiate the inner part of the display chamber  11 . 
     In this case, as described above, the outer surface  48 A of the heat release member  48  constituting the LED illumination member  43  has a circular section around the rotation axis X, so that it is possible to avoid a disadvantage due to the interference of the heat release member  48  with a peripheral device, depending on the attachment position of the heat release member. 
     In consequence, the irradiation light substantially rectilinearly coming in parallel from the LED elements  46  of the LED illumination member  43  can be directed in an arbitrary direction, and the irradiation light can be supplied to the commodities displayed in the display chamber  11 . Moreover, the irradiation light can be supplied to the necessary irradiation position in accordance with the position of the canopy  33  where the LED illumination member is attached. Therefore, an illumination effect can be improved. 
     It is to be noted that in the present embodiment, a plurality of portions to be engaged are formed on the side of the attachment portion  44  constituting the LED illumination member  43 , and the engaging portion  58  is formed on the side of the holding member  42 , but the present invention is not limited to this example. In a second embodiment, the engaging portions may be formed on the side of the attachment portion  44  constituting the LED illumination member  43 , and the portions to be engaged such as the engagement grooves may be formed on the side of the holding member  42 , as shown in  FIGS. 19 and 20 . The number of the portions to be engaged and the number of the engaging portions are not limited to those of this example. Even in this case, a similar effect can be produced. 
     Furthermore, in the present embodiment, when the irradiation angle of the LED illumination member  43  is changed, as described above, the member is once removed, and one of the engagement grooves  53  is selectively engaged with the engaging portion  58  of the holding member  42  to realize the change, but the present invention is not limited to this example. In a case where the holding portion  55  of the holding member  42  and the attachment portion  52  of the attachment portion  44  have predetermined flexibility, the attachment portion  52  is rotated around the rotation axis X in a state in which the attachment portion  44  is attached to the holding member  42  as it is, whereby the angle of the irradiation light from the LED illumination member  43  can be changed. 
     In consequence, the irradiation angle of the LED illumination member  43  can easily be changed, and hence convenience can be improved. 
     Moreover, in the present embodiment, as means for attaching the LED illumination member  43  to the reflective plate  45  of the canopy  33  on the main body  2  side, the holding member  42  fixed to the main body  2  side is used, but additionally, as shown in  FIG. 16 , a clip substantially having a C-shaped section may be used which has been used in holding a fluorescent lamp having a circular section in the existing showcase or the like. In consequence, the holding member  42  specially provided with the engaging portion  58  does not have to be used, and the LED illumination member  43  according to the present invention can be held using a fluorescent lamp holding clip  60  used in the existing showcase. Moreover, the LED illumination member  43  held by the clip  60  is rotated around the rotation axis X with respect to the clip  60 , whereby the irradiation angle can be changed without any trouble. Therefore, versatility can be enlarged, and appropriate illumination can be realized by the illumination device  40  even in the existing showcase. 
     Furthermore, even in this case, the outer surface  48 A of the heat release member  48  constituting the LED illumination member  43  has a circular shape, so that the member can firmly be held by the clip  60 . 
     It is to be noted that in this case, the LED illumination member  43  is attached by the clip  60  in a state in which the LED illumination member  43  abuts on the surface (here the reflective plate  45 ) to which the LED illumination member is to be attached. In consequence, the heat generated by the substrate  47  of the LED illumination member  43  can be released by not only the heat release member  48  but also the abutting reflective plate  45 , and hence heat release efficiency can be improved. It is to be noted that a structure in which the heat release member  48  is allowed to abut on the reflective plate  45  is not limited to the holding by the clip  60 , and the structure may be employed in a case where the illumination member is held using the attachment portion  44  as described above, whereby the improvement of the heat release efficiency is realized. 
     Moreover, as shown in  FIG. 17 , an LED illumination device  61  substantially constituted in the same manner as in the LED illumination device  40  may be attached to the front part of the lower surface of the shelf plate  32  in the display chamber  11  over the longitudinal direction. In such a case, a reinforcement member  62  constituted so as to extend horizontally along the front part of the shelf plate  32  is provided with an engagement hole  63  for attaching the attachment portion  44 , and the attachment leg portions  56  of the attachment portion  44  are inserted into the engagement hole  63  to engage with the engagement hole, whereby the attachment portions  44  hold the opposite ends of the LED illumination member  43  in the longitudinal direction in the same manner as in the LED illumination device  40 . 
     In consequence, even in a case where the illumination device is provided on the lower part of the shelf plate  32 , in the same manner as in a case where the illumination device is provided on the reflective plate  45  of the canopy  33 , the illumination device can be attached so that the irradiation angle can arbitrarily be adjusted, whereby a satisfactory illumination effect can be realized. 
     It is to be noted that the attachment positions of the LED illumination devices  40 ,  61  described above are not limited to the reflective plate  45  of the canopy  33  and the front part of the lower surface of the shelf plate  32 . In addition, even when the illumination device is provided on a hand rail or the like forming the lower edge of the front opening  12 , a similar effect can be produced, and a presentation effect produced by illumination can be improved. 
     Moreover, in the above-mentioned LED illumination devices  40 ,  61 , any harmful ultraviolet ray or heat ray is not radiated to the commodities displayed in the display chamber  11 , so that the commodities can be illuminated without heating them as compared with the conventional fluorescent lamps or the like. Furthermore, unlike the heretofore used fluorescent lamps, any flicker is not generated in the illumination of the LED elements  46 , so that stable illumination can be performed, and the appropriate illumination of the commodities can be realized. Furthermore, with regard to the illumination of the LED elements  46 , dimmer control can easily be changed. Therefore, the dimmer control is changed in accordance with the commodities displayed in the display chamber  11 , whereby further effective illumination can be performed. 
     Furthermore, the LED elements  46  have remarkably long durable years as compared with the fluorescent lamps, which obviates the need for the replacement operation of lightings. Therefore, a laborious operation such as a treatment of waste products discharged owing to the storage and replacement of replacement components does not have to be performed. 
     In addition, according to the present embodiment, the so-called vertical type open showcase to which the LED illumination device  40  is attached has been described as an example, but the present invention is not limited to this example. Even when the present invention is applied to a horizontal type open showcase, a similar effect can be produced.