JP2012185988A - Plug, outlet, luminaire, and show case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plug and an outlet, coping with DC, equipped with a pair of blade terminal members capable of preventing connection with wrong polarity, and smoothly and easily performing attaching work of the plug to a blade receiving terminal member of the outlet, and to provide a luminaire using them, along with a show case using the luminaire.SOLUTION: A plug P1 includes a plug body 1 made from electrically insulating material, a pair of long and short plate-like inserting blade terminal members 3A and 3B, protruding parallel to each other, with a predetermined interval and a different protrusion length, from one surface side 11 of the body 1, and a power feeding line 4 which is connected to the blade terminal members 3A and 3B, to be drawn out of the body 1. An outlet C is attached with the plug P1. A luminaire uses the outlet C and a show case SC uses the luminaire.

Description

  The present invention relates to a plug for supplying DC power, an outlet for connecting the plug and the like, a lighting device such as a lighting fixture using the plug and the outlet, and a show for a product display provided with the lighting device. Regarding the case.

  A fluorescent lamp is often used as a light source for illuminating a displayed product in a showcase that stores and sells the product at a store or the like. Recently, in order to further save energy and facilitate maintenance, a plurality of light-emitting diodes (hereinafter referred to as LEDs) with low power and long life are housed in a light-transmitting tube to form a light source (LED lamp). Things have been developed and put into practical use.

  In the case of a light source using this LED, since various lamps are lit by applying a low-voltage direct current to the LED lamp, various measures are taken in each connecting portion so that there is no erroneous polarity connection.

  For example, a plug-in type plug is formed by projecting a pair of round bar-shaped insertion terminal members having different outer diameters on one surface of a main body made of an electrically insulating material, or by connecting a pair of flat plate-shaped terminal members in parallel. The other terminal member protrudes at a right angle with respect to the terminal member so that the + (positive) electrode and the-(negative) electrode can be distinguished, and the outlet side receiving this also has the shape of the plug terminal member. The receiving side terminal member is provided in accordance with the arrangement, and a pair of plug-side insertion terminal members on the plug side are inserted into the receiving side member and attached. And these things are the structure where the opposite polarity terminal is not mounted | worn with the thing for direct current | flow, and the electrical misconnection which does not match polarity is not made.

  In each of these outlets, one or more receiving side terminal members to which a pair of plug terminal members on the plug side are attached are provided, and each receiving side terminal member has a mutual insulating property and a plug. It is good that it is compact considering the size, etc., but when installing, adding or moving fixtures in lighting equipment such as showcases, many outlets are required, or outlets are moved, It is inconvenient in showcases that often change the display form of products, such as adjusting the wiring length on the appliance side and requiring many connecting members, and the connecting members are obstructive and not good in appearance. I felt.

  However, conventional plugs and outlets for direct current such as those described above have a highly safe structure for electrical connection, but there are restrictions on the location of outlets such as showcases, and they are placed in narrow and deep places. In such a case, it has been difficult to insert and attach the blade-shaped terminal member of the plug into the blade-receiving terminal member of the outlet. In addition, there is known a connecting member called a linear outlet having a long rail-like terminal member that can hang a lighting fixture and make electrical connection and can move the position of the fixture, etc. This outlet is compatible with AC and does not depend on polarity, but it requires a complicated and strong connection structure corresponding to the weight of the appliance.

  In other words, the tip of the blade-shaped terminal member of the plug is usually thin, such as a chamfered blade-shaped member. However, when the blade-shaped terminal member is paired or in a groping state, a strong force is required for insertion or the insertion position. There were problems such as it was difficult to confirm. In addition, there are cases in which a large number of outlets need to be prepared in response to the addition or movement of lighting devices such as lighting fixtures.

  The present invention has been made in view of the above problems, and in plugs and outlets corresponding to direct current, a pair of plugs and outlets can of course prevent misconnection of polarity and can smoothly attach the plug outlet to the blade receiving terminal member. It is an object of the present invention to provide a plug provided with a blade-like terminal member, an outlet, an illumination device using these, and a showcase using this illumination device.

  In order to solve the above-mentioned problems, the first invention of the present invention is different from the plug body made of an electrically insulating material and the projecting length that is projected in parallel on one surface side of the body at a predetermined interval. A plug comprising: a pair of long and short flat plate-like blade terminal members for insertion; and a feeder line connected to each of the blade terminal members and led out from the main body.

  Further, the second invention of the present invention is different from the plug main body made of an electrically insulating material, and the protrusion length protruded from a position shifted parallel to the one surface side of the main body at a predetermined interval and shifted in the parallel direction. A plug comprising: a pair of long and short flat plate-like blade terminal members for insertion; and a feeder line connected to each of the blade terminal members and led out from the main body.

  The third aspect of the present invention covers the base side of the blade-like terminal member protruding from the plug body, and is provided with a step portion made of an electrically insulating material that is integrally or integrally formed with the plug body. It is a plug characterized by.

  According to a fourth aspect of the present invention, there is provided a plug characterized in that the end surface of the flat-plate-like blade-shaped terminal member is inclined in the parallel direction and has different protrusion lengths from the plug body.

  Further, the fifth invention of the present invention is a long outlet base body having a substantially U-shaped cross section made of an electrically insulating material, a partition wall provided in parallel along the longitudinal direction in the base body, An outlet comprising: a pair of grooves formed by the partition walls; and a pair of blade receiving terminal members disposed at different heights in the grooves.

  According to a sixth aspect of the present invention, there is provided an outlet characterized in that the cross section of the blade receiving terminal member is substantially Ω-shaped or substantially U-shaped.

  According to a seventh aspect of the present invention, there is provided a DC power source; the outlet according to claim 5 or 6 connected to the DC power source; 4. A lighting device comprising: the plug according to claim 4; and a DC lighting light source connected to a power supply line of the plug.

  Furthermore, an eighth invention of the present invention is a showcase comprising a case for storing an article and the illumination device according to claim 7 for illuminating the article in the case.

  According to the present invention, when the plug is inserted into the outlet, the plug has an advantage that there is no error in the polarity and the connection can be made and the force for inserting the plug is weak, and the error in the polarity received corresponding to these plugs. It is possible to provide plugs and outlets suitable for direct current use that can improve the workability such as wiring and maintenance with outlets that can be connected to any place or a large number of plugs in the longitudinal direction. . In addition, it is possible to provide a lighting device that has the effect of improving workability and environment using the plug and the outlet, and a showcase using the lighting device.

It is a side view which shows 1st Embodiment of the plug concerning this invention. FIG. 2 is a top view of FIG. 1. It is a bottom view of FIG. FIG. 2 is a front view of FIG. 1. FIG. 2 is a rear view of FIG. 1. It is a side view which shows 2nd Embodiment of the plug concerning this invention. FIG. 7 is a top view of FIG. 6. FIG. 7 is a bottom view of FIG. 6. FIG. 7 is a front view of FIG. 6. FIG. 7 is a rear view of FIG. 6. FIG. 10 is a cross-sectional view taken along the line aa in FIG. 9. It is sectional drawing along the arrow bb line | wire in FIG. It is the vertical side view which notched some showing the embodiment of the concentrate concerning this invention. FIG. 14 is a top view of FIG. 13. FIG. 14 is a bottom view of FIG. 13. FIG. 14 is an enlarged front view of FIG. 13. FIG. 14 is an enlarged rear view of FIG. 13. It is an expanded sectional view along the arrow cc line in FIG. It is a perspective view which shows embodiment of the showcase concerning this invention.

  Hereinafter, embodiments will be described with reference to the drawings. 1 to 5 show a first embodiment of a plug, FIG. 1 is a side view, FIG. 2 is a top view, FIG. 3 is a bottom view, FIG. 4 is a front view, and FIG.

  The plug P1 shown in the figure is a plug body 1 having a substantially rectangular parallelepiped shape made of electrically insulative hard vinyl chloride, and a pair of long and short ones protruding in parallel from the one surface (bottom surface) 11 side of the main body 1 at a predetermined interval. The blade-like terminal members 3A and 3B for inserting the power supply wires 4A and 4B (4) connected to the blade-like terminal members 3A and 3B and the soft vinyl chloride for fixing the power supply wires 4A and 4B to the main body 1 The armor 5 and the like. Reference numeral 12 denotes a finger hooking projection provided on the side surface.

  The insertion blade-shaped terminal members 3A and 3B have a substantially rectangular shape in which a flat phosphor bronze plate is formed by pressing and tin-plated, and the insertion tip has a thin blade shape with chamfering.

  The plug P1 is set in a mold with a pair of blade terminal members 3A and 3B and a power supply line 4 connected to the blade terminal members 3A and 3B and covered with an armor 5 at a predetermined interval. An integrated product can be obtained by supplying hard vinyl chloride inside and solidifying it. Although not shown, the other ends of the feeder lines 4A and 4B are provided with a plug P1 having the same shape as the plug P1 and a known connector.

  6 to 12 show a second embodiment of the plug. The same parts as those in FIGS. 1 to 5 are denoted by the same reference numerals, and the description thereof is omitted. 6 is a side view, FIG. 7 is a top view, FIG. 8 is a bottom view, FIG. 9 is a front view, FIG. 10 is a rear view, and FIG. 11 is a cross-sectional view taken along the line aa in FIG. 12 is a cross-sectional view taken along line bb in FIG.

  The plug P2 of the second embodiment has a stepped portion 2 that protrudes in two steps from the one surface (bottom surface) 11 side of the plug body 1 having a substantially rectangular parallelepiped shape to cover the base side of the blade-like terminal members 3A and 3B. A pair of long and short blade-like terminal members 3A, 3B that are parallel to the heights 2A, 2B of the stepped portion 2 and have an exposed length projecting from the position shifted in the parallel direction by substantially the same dimension; The power supply lines 4A and 4B (4) connected to the blade terminal members 3A and 3B and the armor 5 and the like for fixing the power supply lines 4A and 4B to the main body 1 are mainly configured.

  Further, in the blade-like terminal members 3A and 3B having a substantially rectangular shape for insertion, the end surface of the insertion tip portion is formed into a thin blade shape and is inclined in the longitudinal direction. For example, this inclination is formed such that the distal end portion 31 on the far side is higher than the side where the two terminal members 3A and 3B in the shifted positions are close to each other (the exposed length from the stepped portion protruding base is longer). is there. Further, the exposed protruding lengths of the two-blade terminal members 3A and 3B are substantially the same, but the height from the plug body 1 to the most distal portion 31 of the blade-shaped terminal members 3A and 3B is different, that is, from the high surface 2A. The blade-like terminal member 3A side is long, and the blade-like terminal member 3B from the low surface 2B is in a short and short state. Reference numeral 32 denotes a retaining protrusion provided on the base. This plug P2 is also manufactured by the same means as described above.

  FIGS. 13 to 18 show an embodiment of a linear type outlet C (a part of the middle portion is omitted in the figure because it is long), and a pair of long and short flat plates having different projecting lengths from the plug body 1 in parallel. The plugs P1 and P2 provided with the blade-like terminal members 3A and 3B for insertion are connected to the outlet C for use. 13 is a partially cutaway longitudinal side view, FIG. 14 is a top view, FIG. 15 is a bottom view, FIG. 16 is a front view, FIG. 17 is a rear view, and FIG. It is an expanded sectional view along.

  In FIG. 13 to FIG. 18, reference numeral 6 denotes a long base made of hard vinyl chloride having a substantially U-shaped cross section, and an insulating body having a substantially W-shaped cross section along the longitudinal direction in the base 6. A body 61 is attached. The insulator 61 is provided with two grooves 63A and 63B having different depths and a hollow portion 64 with a partition wall 62 for partitioning in the center. 7A and 7B are long blade receiving terminals having a substantially cross-sectional shape made of phosphor bronze plates provided with a difference in height along the grooves 63A and 63B and having a substantially Ω-shape or a substantially U-shape with elasticity. The members 71 and 71 (one is not shown) are power terminals connected to the blade receiving terminal members 7A and 7B, and 72 and 72 are power lines connected to the power terminals 71 and 71. The other end of 72 is a linear contact C to which a power supply harness 73 is connected.

  64A and 64B are end caps made of flame-retardant ABS resin, which cover the end portions of the blade receiving terminal members 7A and 7B, the power terminals 71 and 71, etc., and fix these members and protect them for safety. . Further, 65,... Are magnets provided on the outer bottom surface of the base 6, 66,... Are locking projections for preventing the blade receiving terminal members 7A and 7B from being pulled out, and 67 shown by a dotted line is the right end cap 64B. It is an insertion hole of the power supply line 72 provided in. It is not necessary when the power line 72 is not inserted through the left end cap 64A and the right end cap 64B through which the power line 72 is not inserted.

  The plugs P1 and P2 are used, for example, as a relay connection tool between the DC power supply and the LED lamp, and the plugs P1 and P2 are connected to the blade receiving terminal members 7A and 7B of the outlet C connected to the DC power supply. The blade-like terminal members 3A and 3B are connected by being inserted and mounted.

  In other words, the outlet C has the long blade receiving terminal members 7A and 7B disposed in the grooves 63A and 63B partitioned by the partition wall 60 of the insulator 61. In the blade receiving terminal member 7A (+ pole) on the side, the blade terminal member 3A (+ pole) on the long side protruding from the main body 1 of the plugs P1 and P2 and the blade receiving on the shallow groove 63B side are provided. A blade-like terminal member 3B (-pole) having a shorter projecting length is inserted into the terminal member 7B (-pole). Further, in the case of the plug P2, the stepped portion 2 of the plug main body 1 is fitted into the hollow portion 64 having substantially the same shape as the stepped portion 2, and the lower surface 11 and the upper surface of the opening of the outlet C are close to or in contact with each other. It is possible to make a predetermined polarity connection.

  The long side of the plugs P1 and P2 is connected to the blade receiving terminal member 7B (-pole) on the shallow groove 63B side of the outlet C in a state where the insertion of the blade-shaped terminal members 3A and 3B of the plugs P1 and P2 is reversed 180 degrees. Even if the blade-like terminal portion 3 material A (+ pole) is inserted, only a part of the tip can be inserted and the entry stops, and the other short-side blade-like terminal member 3B (-pole) is on the deep groove 63A side. Since it does not reach and does not contact the blade receiving terminal portion 7 material A (+ pole), it is not energized, and it is possible to prevent damage to the LED lamp, the power supply circuit device, and the like due to incorrect connection.

  In the present invention, when the plug P1 or P2 is attached to the outlet C, the blade terminal portions 3A and 3B are opposed to the blade receiving terminal members 7A and 7B, and both the most distal end portions 31 and 31 are the blade receiving terminal members 7A. , 7B, or even if the tip 31 is in contact with the blade receiving terminal member 7A only when it is inclined and only on the blade terminal member 7A side, or the blade receiving terminal members 7A, 7B. Even if the blade-like terminal members 3A and 3B are in contact with each other, the force of inserting the plugs P1 and P2 may be weak because the resistance is small in a contact state where the contact area only in the vicinity of the most distal portion 31 is small.

  When the plugs P1 and P2 are continuously inserted, the blade receiving terminal members 7A and 7B having an approximately Ω shape with elasticity are expanded to receive the flat blade-like terminal members 3A and 3B. Electrical connection is made by sandwiching and pressing from both sides, and mechanical fixing is also made. In the case of the plug P1, the bottom surface 11 and the opening of the base body 61 of the outlet C are brought into contact with or in contact with each other and an electrical connection error occurs. Installed without any problems. In the case of the plug P 2, the stepped portion 2 is fitted into the hollow portion 64, thereby further firmly fixing. Further, when the plug P1 or P2 is attached to or detached from the outlet C, the operation can be easily performed by putting a finger on the hooking protrusion 12 provided on the side surface of the main body 1.

  Further, in the present invention, the provided outlet C is long, and the plugs P1 and P2 connected to the device can be inserted and attached at any location close to the device when power is supplied, and the wiring distance of the electric wire can be shortened. A plurality of plugs P1 and P2 can be inserted and used in one outlet C, so that the arrangement around the equipment can be organized.

  As described above, the plugs P1 and P2 are connected to the outlet without error in polarity by making the protruding heights (lengths) of the pair of blade-shaped terminal members provided in parallel differ. It has the advantage that it can be easily mounted. Further, the plug P2 can be inserted into the outlet with a smaller insertion force because the end faces of the blade-like terminal members 3A and 3B are inclined in the parallel direction.

  Further, the long outlet C does not have a wrong polarity connection corresponding to the plugs P1 and P2, and can connect a large number of plugs P1 and P2, and is easy to connect.

  Therefore, it is possible to provide the plugs P1 and P2 and the outlet C suitable for direct current and the like that can improve the workability such as wiring and maintenance of the intermediate connection member.

  FIG. 19 is a perspective view showing an embodiment of a showcase SC according to the present invention. Each of the showcases SC is composed of, for example, a plurality of steel columns 81,..., A base 82 for vertically supporting the columns 81, a horizontal column 83 for connecting the columns 81,. ,..., And the shelf boards 85,... Mounted on the arm bodies 84,.

  Further, on the shelf plate 85,..., The products to be displayed are arranged, and a light source for direct current lighting that illuminates these products, here an LED lamp L in which a plurality of LEDs are arranged in series in a straight tube. Are provided on the lower surface of the front side of the shelf boards 85. In addition, the above-mentioned linear type outlet C is vertically supported by an arbitrary support 81,... (Each support or every other support) via a magnet 65 on the back surface, and each LED lamp L,. It is connected via the plug P1 attached to the outlet C.

  In FIG. 19, the LED lamps L,... In the left column are turned on by plugs 91 connected to an AC power source, AC adapters 92 for DC conversion, power supply lines 93, plugs 94, and outlets C provided along the columns 81. -Plug P1 according to the present invention-Power supply line 4-Connection device 95-Energization is performed through the LED lamp L, and the LED lamps L in the middle row and the right row are connected from the outlet C to the plug 96 and the power supply wire 97 in the above. It is lit in the same way by connecting to the adjacent outlet C via the.

  In the showcase SC having the above configuration, the power supply line 4 is increased when the shelf 85 is increased to display a new product, the height of the product or the product is changed, and the height of the shelf 85 is moved upward or downward. If you want to change the insertion position of the plug P1 when there is not enough room, the plug P1 can be easily pulled out from the outlet C and inserted into another position without requiring a strong force, and the workability can be improved. Prevents incorrect connection of polarity.

  Further, the plugs P1 and P2 according to the present invention can be used for the connecting members such as the plug 94, the outlet C, and the transition plug 96 used in each of the connecting portions (DC portions), and the outlet is not limited to a linear type. In addition, the number is not limited. Moreover, although the case where the shelf plates 85,... Are provided in three rows has been described, the shelf plate 85 may be a single row of showcases, in which case the transition plug 96 is not necessary.

  The present invention is not limited to the above embodiment. For example, the stepped portion that covers the base side of the blade-shaped terminal member protruding from the plug body is formed only around the base of the blade-shaped terminal portion in the second embodiment. Even if the stepped portion is formed integrally with the plug body, the stepped portion formed with the insertion hole of the blade-shaped terminal portion is inserted later into the base of the blade-shaped terminal member. It may be constructed integrally so as to cover the side. Further, if this step portion is formed of a soft material, the adhesion at the joint surface with the outlet can be improved.

  In addition, the inclination direction of the end face of the tip end of the pair of long and short blade-shaped terminal members is made higher in the most distal portion on the side away from each other as in the second embodiment (the exposure length from the protruding portion of the stepped portion is increased). Although not shown in the figure, the leading edge of the side where both are close may be raised, or both may be inclined in the same direction. In addition, in the pair of long and short blade-shaped terminal members, it is electrically preferable that the long side is a positive (+) electrode and the short side is a negative (-) electrode. In addition, an armor that protects the feeder line led out from the plug body is not essential.

  In the above embodiment, the outlet is provided with a separate insulator from the base to dispose the pair of blade receiving terminal members. However, the present invention is not limited to this. You may make it arrange | position a blade receiving terminal member in it. Further, the means for making the height difference between the pair of blade receiving terminal members, the structure of the insulator, the partition, the groove and the like are not limited to those shown in the embodiment. The blade receiving terminal member is not limited to a substantially Ω shape or a substantially U shape, and may have a structure in which it is elastically received and pressed by a plate-like member.

  Moreover, the power supply power supply line is not essential for the outlet, and power may be supplied to the blade receiving terminal member via the plug according to the present invention having the other end connected to the power supply.

  Moreover, in order to reinforce the mechanical fixation between the outlet and the plug, it is possible to add means such as fitting and engagement by unevenness to the stepped portion and the hollow portion.

  Further, in the above embodiment, the LED lamp is described as the DC lighting light source as the lighting device, but the light source is not limited to the LED lamp but may be a discharge lamp or a light bulb.

  A specific example of the plug P2 shown in the second embodiment will be described below.

  The plug body 1 is made of hard vinyl chloride and has a substantially rectangular parallelepiped shape with a length of about 30 mm, a height of about 15 mm, and a width of about 12 mm. The height of the main body 1 on the bottom surface 11 side along the longitudinal direction is the height on the high surface 2A side. Is formed integrally with the main body 1 with a height of about 5.4 mm, a height of about 2.3 mm on the lower surface 2B side, and a width of about 5.8 mm of both.

  The blade-like terminal portions 3A and 3B are formed by pressing a phosphor bronze plate having a thickness of about 0.8 mm into a substantially rectangular shape having a length of about 17 mm and a width of about 10 mm. An inclined surface with chamfered both surfaces is formed so as to be thin, and the tip surface is not parallel to the horizontal plane (the hh line shown in FIG. 6) (θ) and is inclined about 3 degrees.

  Then, the plug body 1 and the stepped portion 2 are spaced apart by about 4.2 mm in the parallel direction, and the base end side is buried at a position where the mutual center is shifted by about 9 mm, and about 5 mm from the high surface 2A and the low surface 2B, respectively. The difference in protrusion height (length) between the blade-shaped terminal portions 3A and 3B of the blade-shaped terminal portions 3A and 3B projected by .5 mm was about 3 mm. Further, the difference in height between the left and right ends of the tip surface due to the inclination of the tip surface is about 0.4 mm. When the blade-like terminal portions 3A and 3B of the plug P1 are placed on a plane, both the most distal portions 31 are formed on the plane. 3 are in contact with each other, and the other end is slightly lifted and not in contact.

  Further, the linear type outlet C shown in the above embodiment corresponding to the plug P2 has an outlet base 61 made of hard vinyl chloride having a total length of 1000 to 1800 mm, a height of about 16 mm, and a width of about 12.3 mm. The cross section is substantially U-shaped, and the inside is provided with two grooves 63A and 63B and a hollow portion 64 which are divided by the partition wall 62 in the longitudinal direction and have different depths. The maximum height including the end caps 64A and 64B is about 18.3 mm.

  In addition, blade receiving terminal portions 7A and 7B formed by bending a phosphor bronze plate having a thickness of about 0.35 mm into a substantially Ω shape are mounted in the grooves 63A and 63B.

  In addition, the linear type outlet C is changed in the longitudinal dimension so as to be able to cope with various conditions such as the installation location of a lighting device in a showcase or the like, space, electric capacity, etc. For example, the total length is about 1000 mm, about 1300 mm , About 1500 mm, about 1800 mm, etc.

  The present invention is not limited to application to lighting devices such as showcases, but can be used in electrical appliances and electrical equipment that use various types of direct current.

P1 to P2 ... plug, 1 ... plug body, 2 ... stepped portion,
3A, 3B ... Blade terminal member 31 ... Cutting edge part
60 ... partition wall, 61 ... base, 63A, 63B ... groove,
7A, 7B ... blade receiving terminal member, L: light source for direct current lighting (LED lamp),
SC ... Showcase,

Claims (8)

A plug body made of an electrically insulating material; a pair of long and short flat-plate blade terminal members with different projecting lengths that are projected in parallel to one surface side of the body at predetermined intervals; A feeder line connected and derived from the body;
A plug characterized by comprising: A plug main body made of an electrically insulating material; a pair of long and short flat plate-like cutting blades that are parallel to one side of the main body at a predetermined interval and have different protrusion lengths protruding from positions shifted in the parallel direction. A terminal member; a feed line connected to each of the blade-shaped terminal members and led out from the main body;
A plug characterized by comprising:   The step part which covers the base side of the blade-shaped terminal member which protruded from the plug main body, and was formed integrally or integrally with the plug main body and made of an electrically insulating material is provided. Plug.   The plug according to any one of claims 1 to 3, wherein the end face of the tip of each flat blade-shaped terminal member is inclined in the parallel direction and has different projecting lengths from the plug body. A long outlet base body having a substantially U-shaped cross section made of an electrically insulating material; a partition wall provided in parallel along the longitudinal direction in the base body; a pair of grooves formed by the partition wall; A pair of blade receiving terminal members disposed at different heights in the groove;
An outlet characterized by comprising.   6. The outlet according to claim 5, wherein a cross section of the blade receiving terminal member is substantially Ω-shaped or substantially U-shaped. A DC power supply; the outlet according to claim 5 or 6 connected to the DC power supply; and the plug according to any one of claims 1 to 4 inserted and attached to a blade receiving terminal member of the outlet; A DC lighting light source connected to the power line of the plug;
An illumination device comprising: A case for storing the article; and the lighting device according to claim 7 for illuminating the article in the case;
A showcase characterized by comprising:

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