Abstract:
Generally, existing LED lamps often use robust metallic cases since each of the cases functions as a heat sink. Various shapes for increasing the heat dissipation properties of the case have been employed; there is no unified shape. Existing LED lamps therefore have a problem that they cannot be easily disassembled at the time of recycling. Thus, an object is to provide a lamp which can be easily disassembled at the time of recycling. A lamp includes: a case having a certain shape; an LED module including a semiconductor light-emitting device; and a power supply circuit provided inside the case, for driving the semiconductor light-emitting device to emit light, wherein on an outer side of the case, a step for splitting the case is formed.

Description:
TECHNICAL FIELD 
     The present invention relates to lamps and lighting apparatuses, and particularly relates to a lamp and a lighting apparatus, each of which includes a light source having a semiconductor light-emitting device. 
     BACKGROUND ART 
     In recent years, lamps including semiconductor light-emitting devices such as Light-Emitting Diodes (LEDs) (hereinafter referred to as “LED lamps”) have been increasingly used as lamps which would replace existing incandescent lamp bulbs or halogen lamp bulbs since these LED lamps have higher efficiency and longer operating life than the incandescent lamp bulbs or halogen lamp bulbs. In such a situation, more LED lamps are expected to be discarded in the future, and it is therefore important to efficiently recycle various resources included in the LED lamps. 
     For example, it is preferable to collect and recycle rare metals, such as gold or platinum, or heavy metals, such as gallium, included in components of the LED lamps. Since the LED lamps use a larger number of components than the existing incandescent lamp bulbs or halogen lamp bulbs, the effect of recycling of the LED lamps is high. 
     In order to efficiently recycle the LED lamps, the components included in the LED lamps need to be taken out. It is therefore preferred that the LED lamps can be relatively easily disassembled at the time of recycling. 
     In the field of general home appliances, various techniques for facilitating the disassembling at the time of recycling have been proposed (see PTL 1, for example). PTL 1 discloses a technique which facilitates the disassembling by using an engaging claw and a smaller number of screws. 
     CITATION LIST 
     Patent Literature 
     [PTL 1]
     Japanese Unexamined Patent Application Publication No. H6-112665   

     SUMMARY OF INVENTION 
     Technical Problem 
     Generally, existing LED lamps often use robust metallic cases since each of the cases functions as a heat sink. For the shape of the case, various shapes for increasing the heat dissipation properties have been employed; there is no unified shape. The existing LED lamps therefore have a problem that they cannot be easily disassembled at the time of recycling. 
     Thus, the present invention has been devised in view of the above problem and has an object to provide a lamp which can be easily disassembled at the time recycling. 
     Solution to Problem 
     In order to achieve the above object, a lamp according to an aspect of the present invention comprises: a case having a certain shape; a light source including a semiconductor light-emitting device; and a lighting circuit provided inside the case, for driving the semiconductor light-emitting device to emit light, wherein on an outer side of the case, a step for splitting the case is formed. 
     With the step for splitting the case as above, a recycling manufacturer can easily split the case and thereby disassemble the lamp. 
     Furthermore, it is preferable that the step be a through groove, and the lamp further comprise a split member joined to both sides of the through groove and embedded in the through groove in such a way as to allow the split member to be pulled out. 
     This allows a recycling manufacturer to split the case by pulling out the split member from the through groove, i.e., without using cutting tools, which further facilitates the disassembling of the lamp. 
     Furthermore, it is preferable that the lamp further comprise a pullout member connected to an end of the split member, for pulling out the split member from the through groove. 
     This allows the split member to be pulled out from the through groove by pulling out the pullout member, which further facilitates the disassembling of the lamp. 
     Furthermore, it is preferable that the pullout member be embedded in the through groove, and the pullout member have a hole formed in a groove direction of the through groove. 
     This allows the pullout member to be pulled out using a hole formed in the pullout member, which further facilitates the disassembling of the lamp. Furthermore, since the pullout member is embedded in the through groove, the pullout member can be prevented from being too easily pulled out or unintentionally pulled out (for example, being caught on something), with the result that the case can be prevented from being split at times other than the time of recycling. 
     Furthermore, it is preferable that the through groove include a first groove portion and a second groove portion formed on a bottom of the first groove portion, the second groove portion having a groove width narrower than a groove width of the first groove portion, the split member be embedded at least in the second groove portion, and the pullout member be embedded in the first groove portion. 
     With this, since the pullout member is embedded in the first groove portion, the pullout member can be prevented from being too easily pulled out or unintentionally pulled out (for example, being caught on something), with the result that the case can be prevented from being split at times other than the time of recycling. 
     Furthermore, it is preferable that the case further include an intersecting groove which intersects the through groove, and the pullout member be embedded in the intersecting groove. 
     This allows the pullout member to be prevented from being too easily pulled out or unintentionally pulled out (for example, being caught on something), with the result that the case can be prevented from being split at times other than the time of recycling. 
     Furthermore, it is preferable that the pullout member have a hole formed in a groove direction of the intersecting groove. 
     This allows the pullout member to be pulled out using a hole formed in the pullout member, which further facilitates the disassembling of the lamp. 
     Furthermore, it is preferable that the lamp further comprise a cover member provided so as to cover an opening of the intersecting groove. 
     With this, the pullout member for pulling out the split member from the through groove is concealed, with the result that the case can be prevented from being split by a user pulling the pullout member too easily. 
     Furthermore, it is preferable that the cover member be formed by coating the intersecting groove with metal powder. 
     This allows the pullout member to be easily concealed. 
     Furthermore, it is preferable that the lamp further comprise: a power supply line disposed inside the case, for supplying power to the semiconductor light-emitting device; and a disconnecting unit configured to cut the power supply line when the split member is pulled out. 
     With this, the splitting of the case by the split member accompanies the cutting of the power supply line, which prevents the lamp from being used after the case is split and thereby allows improvement in safety. 
     Furthermore, it is preferable that the disconnecting unit include: a blade member attachment connected to the split member; and a blade member having a blade shape attached to the blade member attachment, and the power supply line be disposed so as to pass between the split member and the blade member. 
     With this, the power supply line can be cut by a blade member. 
     Furthermore, it is preferable that the lamp further comprise a regulating unit configured to prevent the power supply line from moving toward the blade member. 
     This allows the power supply line to be prevented from being cut by the blade member at times other than splitting of the case. 
     Furthermore, it is preferable that the step include: a first groove portion formed over an entire circumference of the outer side of the case; and a second groove portion having a groove width narrower than a groove width of the first groove portion, the second groove portion being formed partially on a bottom of the first groove portion in a circumferential direction of the first groove portion. 
     This makes it possible to split the case by relatively small external force after a part of the first groove portion in which the second groove portion is not formed is cut using a cutting tool or the like. 
     Furthermore, it is preferable that the step be formed in a circumferential direction of the case. 
     With this, the dissembling of the split case becomes easier. 
     Furthermore, it is preferable that the case be made of a metal. 
     With this, the heat inside can be efficiently dissipated through the case. 
     Furthermore, in order to achieve the above object, a lighting apparatus according to an aspect of the present invention comprises: the above lamp; and a holding unit configured to hold the lamp. 
     With this, it is possible to produce the same or like effects as the above lamp. 
     Advantageous Effects of Invention 
     As is clear from the above descriptions, the lamp or the lighting apparatus according to an aspect of the present invention includes a step for splitting the lamp, with the result that a recycling manufacturer can easily split the case and thereby disassemble the lamp. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a front elevational view of a lamp according to Embodiment 1 of the present invention. 
         FIG. 2  is an exploded perspective view of the lamp according to Embodiment 1 of the present invention. 
         FIG. 3  is a cross-sectional view of the lamp according to Embodiment 1 of the present invention. 
         FIG. 4  is an expanded cross-sectional view of a groove formed in the lamp according to Embodiment 1 of the present invention. 
         FIG. 5  illustrates an example of a disassembling method for the lamp according to Embodiment 1 of the present invention. 
         FIG. 6  is a front elevational view of a lamp according to Embodiment 2 of the present invention. 
         FIG. 7  is an expanded cross-sectional view of a groove formed in the lamp according to Embodiment 2 of the present invention. 
         FIG. 8  is a front elevational view of a lamp according to Embodiment 3 of the present invention. 
         FIG. 9  is an expanded cross-sectional view of a groove formed in the lamp according to Embodiment 3 of the present invention. 
         FIG. 10  is an expanded cross-sectional view of an intersecting groove formed in the lamp according to Embodiment 3 of the present invention. 
         FIG. 11  is a perspective view of a pullout member according to Embodiment 3 of the present invention. 
         FIG. 12  illustrates an example of a disassembling method for the lamp according to Embodiment 3 of the present invention. 
         FIG. 13  is a front elevational view of a lamp according to Embodiment 4 of the present invention. 
         FIG. 14  is an expanded cross-sectional view of a groove and a pullout member formed in the lamp according to Embodiment 4 of the present invention. 
         FIG. 15  is a perspective view of a lamp according to Embodiment 5 of the present invention, with a globe, an LED module, and an LED module holder removed. 
         FIG. 16  is an expanded cross-sectional view of a vicinity of a disconnecting unit of the lamp according to Embodiment 5 of the present invention. 
         FIG. 17  is a schematic cross-sectional view of a lighting apparatus according to an implementation of the present invention. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Embodiments of the present invention are described below with reference to the drawings. 
     Embodiment 1 
     With reference to  FIGS. 1 to 3 , the overall structure of a lamp  10  according to Embodiment 1 of the present invention is described.  FIG. 1  is a front elevational view of the lamp according to Embodiment 1 of the present invention.  FIG. 2  is an exploded perspective view of the lamp according to Embodiment 1 of the present invention.  FIG. 3  is a cross-sectional view of the lamp according to Embodiment 1 of the present invention. Specifically,  FIG. 3  is a cross-sectional view taken along line A 1 -A 1  of  FIG. 1 . 
     As shown in  FIGS. 1 to 3 , the lamp  10  according to this embodiment is a bulb-shaped LED lamp. The lamp  10  includes a globe  101 , an LED module  102 , an LED module holder  103 , a power supply circuit  104 , a resin case  105 , a resin cap  106 , an insulating ring  107 , a base  108 , and a case  11 . 
     The globe  101  is a hemispherical light-transmissive cover for radiating light from the LED module  102  to outside of the lamp. The globe  101  is made of a glass material to which light diffusion treatment such as frosted-glass treatment has been imparted so as to spread the light emitted from the LED module  102 . An edge of an opening of the globe  101  is placed in contact with the upper surface of the LED holder  103 . The globe  101  is bonded to the case  11  by heat-resistant silicon adhesive. 
     It is to be noted that the shape of the globe  101  is not limited to a hemispherical shape and may be a spheroid shape or an oblate spheroid shape. In addition, the material of the globe  101  is a glass material in this embodiment, but the material of the group  101  is not limited to the glass material and may be synthetic resin or other material. 
     The LED module  102  is a light source which emits illumination light of a predetermined color. The LED module  102  includes a substrate and a plurality of LED chips (semiconductor light-emitting devices) mounted on the substrate. The LED chips often use gallium-based semiconductors such as gallium arsenide (GaAs)-based or gallium phosphide (GaP)-based semiconductors. 
     The LED module holder  103  is a holder (a module plate) composed of a metal substrate for holding the LED module  102 . In this embodiment, the LED module holder  103  is a disc-shaped member fabricated by aluminum die casting. It is to be noted that the LED module holder  103  has a notch for the passage of a power supply line  104   a  by which the power supply circuit  104  and the LED module  102  are electrically connected. 
     The power supply circuit  104  corresponds to a lighting circuit for driving the semiconductor light-emitting device to emit light. Specifically, the power supply circuit  104  includes: a plurality of circuit devices which compose a circuit for driving LED chips of the LED module  102  to emit light; and a circuit board on which the circuit devices are mounted. The power supply circuit  104  converts alternating-current (AC) power received from the base  108  into direct-current (DC) power and supplies the DC power to the LED chips of the LED module  102  through the power supply line  104   a.    
     The resin case  105  is a case for housing the power supply circuit  104 . Furthermore, the resin case  105  has a shape which is substantially identical to the shape of the case  11 . The resin case  105  is disposed so that there is a gap between the resin case  105  and the case  11 . 
     The resin cap  106  is a substantially disc-shaped lid for covering an upper opening of the resin case  105 . The resin cap  106  has a through hole for the passage of the power supply line  104   a.    
     The insulating ring  107  is a member for providing insulation between the base  108  and the case  11  and is located between the base  108  and the case  11 . The inner circumferential surface of the insulting ring  107  is in contact with the outer circumferential surface of a lower part of the resin case  105 . With the resin case  105  and the base  108  attached by screwing, the insulating ring  107  is clasped between an edge of an opening of the base  108  and an edge of an opening of the case  11 . 
     The base  108  is a power receiving unit for receiving AC power through two contacts. The power received by the base  108  is input to a power input unit of the power supply circuit  104  through a power supply line (not shown). 
     The case  11  is a tubular member with two openings in the vertical direction. Furthermore, the case  11  is a metallic member. In this embodiment, the case  11  is made of an aluminum alloy material. This case  11  functions as a heat sink which dissipates, to outside, heat generated from the LED module  102 . Thus, the case  11  has a surface treated with alumite in order to improve a thermal emittance. 
     Furthermore, the case  11  has, on the outer side, a groove  12  for splitting the case  11 . This groove  12  is an example of the step. Here, splitting means dividing the case  11  into two or more parts. It is to be noted that the two or more parts resulting from the splitting do not always need to be completely separated off and may be partially connected. 
     In this embodiment, the groove  12  is formed over the entire circumference of the case  11 . Furthermore, the groove  12  is formed between the LED module  102  and the power supply circuit  104 . 
     It is to be noted that the groove  12  does not always need to be formed over the entire circumference of the case  11 . The groove  12  may be formed in a part of the case  11 . Specifically, it is preferable that the groove  12  be formed 180 degrees or more in the circumferential direction of the case  11 . This allows a recycling manufacturer to split the case  11  by applying thereto relatively small vertical external force with a hand, a machine, or the like after the part with the groove  12  is cut. 
     Furthermore, it is preferable that a thickness of the case  11  in a region where the groove  12  is formed be uniform in the circumferential direction. This allows a recycling manufacturer to easily split the case from any position in the circumferential direction in which the groove  12  is formed. 
       FIG. 4  is an expanded cross-sectional view of a groove formed in the lamp according to Embodiment 1 of the present invention. Specifically,  FIG. 4  is an expanded view of a region B shown in  FIG. 3 . 
     As shown in  FIG. 4 , the groove  12  has an arc-shaped cross section. The case  11  has a smaller thickness in the region where the groove  12  is formed than in the region near the groove  12 , that is, the region where the groove  12  is not formed. 
     It is to be noted that the groove  12  does not always need to have an arc-shaped cross section. For example, the groove  12  may have a triangular or rectangular cross section. 
     Furthermore, it is preferable that, of the case  11 , the thickness of at least a part of the region where the groove  12  is formed be half or less than half of the thickness in the nearby region where the groove  12  is not formed. This allows a recycling manufacturer to more easily split the case  11  by cutting the bottom of the groove  12 . 
     Next, a disassembling method for the lamp  10  configured as above is described. 
       FIG. 5  illustrates an example of a disassembling method for the lamp according to Embodiment 1 of the present invention. 
     As shown in (a) of  FIG. 5 , a recycling manufacturer cuts the case  11  at the position of the groove  12 , for example, using a cutter  201  such as a laser cutter or a saw. As a result, the lamp  10  is split into an upper part and a lower part as shown in (b) and (c) of  FIG. 5 . 
     At this time, the LED module  102  is included in an upper case  11   a  shown in (b) of  FIG. 5  while the power supply circuit  104  is included in a lower case  11   b  shown in (c) of  FIG. 5 . This means that the lamp  10  is split into the upper part and the lower part in such a way that the LED module  102  and the power supply circuit  104  are not significantly damaged. In addition, since the power supply line  104   a  intersects with the groove  12  formed in the circumferential direction, the cutting of the case  11  accompanies the cutting of the power supply line  104   a , as shown in (c) of  FIG. 5 . 
     From the lamp  10  split into the upper part and the lower part as above, the recycling manufacturer then takes out the LED module  102  and the power supply circuit  104  to disassemble the lamp  10 . For example, the recycling manufacturer physically destroys the globe  101  to take out the LED module  102 . Alternatively, for example, the recycling manufacturer detaches the resin cap  106  to take out the LED module  102  provided inside the resin case  105 . Moreover, the recycling manufacturer detaches the resin case  105 , the insulating ring  107 , and the base  108  from the case  11 . 
     As above, since the lamp  10  according to this embodiment has the groove  12  for splitting the case  11 , a recycling manufacturer can easily split the case by cutting the thin part of the case  11  where the groove  12  is formed, to disassemble the lamp. 
     Furthermore, in the case where the case  11  is cut using a cutting tool having a blade, a recycling manufacturer can insert the blade to the groove to cut the case  11 , which means that it is easy to position the blade in the cutting process, with the result that the case  11  can be easily cut. 
     Although the groove  12  is formed on the outer side of the case  11  in this embodiment, the groove  12  does not always need to be formed. For example, the outer side of the case  11  may be formed to have a stair-like shape. Specifically, it is sufficient that the outer side of the case  11  has a step for splitting the case  11 . With this, in the case of cutting the case  11  using a cutting tool having a blade, a recycling manufacturer can position the blade using the step and thereby easily cut the case  11 . This means that the recycling manufacturer can easily split the case to disassemble the lamp. 
     Embodiment 2 
     Next, Embodiment 2 of the present invention is described. 
     A lamp  20  according to this embodiment is the same as the lamp  10  according to Embodiment 1 except that the groove has a different shape. Accordingly, the following describes the lamp  20 , mainly the shape of the groove, according to this embodiment. 
       FIG. 6  is a front elevational view of the lamp according to Embodiment 2 of the present invention. In  FIG. 6 , constituents which are the same or like as those in  FIG. 1  are denoted by the same numerals and are not described. 
     On a case  21 , a groove  22  which is different in shape from the groove  12  according to Embodiment 1 is formed at a position which is the same or like as that of the case  11  according to Embodiment 1. 
       FIG. 7  is an expanded cross-sectional view of the groove formed in the lamp according to Embodiment 2 of the present invention. Specifically,  FIG. 7  is an expanded view of the vicinity of the groove taken along line A 2 -A 2  of  FIG. 6 . As shown in  FIG. 7 , the groove  22  is formed in the circumferential direction of the case  21  and includes a first groove portion  22   a  and a second groove portion  22   b.    
     The first groove portion  22   a  is formed over the entire circumference of the case  21 . Furthermore, the first groove portion  22   a  has a rectangular cross section. 
     The second groove portion  22   b  is formed on the bottom of the first groove portion  22   a  and has a groove width narrower than a groove width of the first groove portion  22   a . The second groove portion  22   b  is formed partially in the circumferential direction of the case  21 . Furthermore, the second groove portion  22   b  has a triangular cross section. 
     It is to be noted that the cross-sectional shape of the first groove portion  22   a  and the cross-sectional shape of the second groove portion  22   b  are not limited to the above shapes. For example, each of the first groove portion  22   a  and the second groove portion  22   b  may have an arc-shaped cross section. 
     Next, a disassembling method for the lamp  20  configured as above is described. 
     A recycling manufacturer cuts, using a cutter such as a laser cutter or a saw, a part of the first groove portion  22   a  in which the second groove portion  22   b  is not formed, for example. The recycling manufacturer then applies force in a direction in which an upper part and a lower part of the lamp  22  are pulled away, to thereby tear the part in which the second groove portion  22   b  is formed. 
     Thus, a recycling manufacturer can split the lamp  20  into the upper part and the lower part from the position where the groove  22  is formed. It is to be noted that since the part where the second groove portion  22   b  is formed is a thin part of the case  21 , a recycling manufacturer can tear, by applying relatively small force, the part where the second groove portion  22   b  is formed. 
     As above, in the case of the lamp  20  according to this embodiment, the case  21  can be split by relatively small external force after a part of the groove  22  where the second groove part  22   b  is not formed is cut using a cutting tool or the like. Thus, a recycling manufacturer can easily disassemble the lamp  20 . 
     Embodiment 3 
     Next, Embodiment 3 of the present invention is described. 
     A lamp  30  according to this embodiment is the same as the lamp  10  according to Embodiment 1 except that a split member and the like are provided and that the shape of the groove and other matters are different. Accordingly, the following describes the lamp  30  according to this embodiment, mainly differences from the lamp  10  according to Embodiment 1. 
       FIG. 8  is a front elevational view of the lamp according to Embodiment 3 of the present invention. In  FIG. 8 , constituents which are the same or like as those in  FIG. 1  are denoted by the same numerals and are not described. 
     A case  31  has, on the outer side, a groove  32  in the circumferential direction. In this embodiment, the groove  32  is formed below the LED module holder  103 . 
     Furthermore, the outer side of the case  31  has an intersecting groove  33  which intersects the groove  32 . In this embodiment, the intersecting groove  33  is formed in the axial direction of the case  31 . 
       FIG. 9  is an expanded cross-sectional view of the groove formed in the lamp according to Embodiment 3 of the present invention. Specifically,  FIG. 9  is an expanded view of the vicinity of the groove taken along line A 3 -A 3  of  FIG. 8 . 
     As shown in  FIG. 9 , the groove  32  is a through groove. Furthermore, in the groove  32 , a split member  34  is embedded. 
     The split member  34  is embedded in the groove  32  in such a way that the split member  34  is joined to both sides of the groove  32  and can be pulled out. In this embodiment, the split member  34  is a string member bonded to the both sides of the groove  32  using adhesive or the like. Furthermore, the split member  34  has a convex cross section, and the both sides of the convex portion are joined to the respective sides of the groove  32 . 
     Although the split member  34  preferably has a convex cross section, the cross-sectional shape of the split member  34  does not always need to be convex. For example, the cross-sectional shape of the split member  34  may be a simple rectangle In other words, the cross-sectional shape of the split member  34  may be any shape as long as the split member  34  can be joined to the both sides of the groove  32  and can also be pulled out from the groove  32 . 
     The following describes a pullout member  35  with reference to  FIGS. 10 and 11 . 
       FIG. 10  is an expanded cross-sectional view of the intersecting groove formed in the lamp according to Embodiment 3 of the present invention. Specifically,  FIG. 10  is an expanded cross-sectional view of a region C shown in  FIG. 8 .  FIG. 11  is a perspective view of the pullout member according to Embodiment 3 of the present invention. 
     In the intersecting groove  33 , the pullout member  35  is embedded. This pullout member  35  is a member for pulling out the split member  34  from the groove  32 . Furthermore, the pullout member  35  is connected to an end of the split member  34 . 
     The pullout member  35  is a tubular member. Specifically, the pullout member  35  has a through hole. This through hole is formed in a groove direction of the intersecting groove  33 . Although the pullout member  35  is preferably fully embedded in the intersecting groove  33 , but it may be partially embedded in the intersecting groove  33 . 
     Furthermore, the pullout member  35  does not always need to have a tubular shape. For example, the pullout member  35  may have a polygonal tubular shape. In addition, the pullout member  35  does not always need to have a through hole. The pullout member  35  may have any shape that allows a recycling manufacturer to easily pull out the pullout member  35  from the intersecting groove  33 . For example, the pullout member  35  may have a non-through hole on at least one end. In this case, a recycling manufacturer can hook a tool in this non-through hole and pull out the pullout member  35  from the intersecting groove  33 . 
     The opening of the intersecting groove  33  is covered by a cover member  36 . In other words, the cover member  36  is placed so as to cover the opening of the intersecting groove  33 . This cover member  36  is formed by coating the intersecting groove  33  with metal powder, for example. 
     It is to be noted that the cover member  36  does not always need to be formed by coating the intersecting groove  33  with metal powder. The cover member  36  may be any member that can conceal the pullout member  35  embedded in the intersecting groove  33 . For example, the cover member  36  may be a film-shaped member attached to the outer side of the case  31  so as to cover the intersecting groove  33 . Furthermore, although the cover member  36  is preferably provided on the lamp  30 , but it does not always need to be provided. 
     Next, a disassembling method for the lamp  30  configured as above is described. 
       FIG. 12  illustrates an example of the disassembling method for the lamp according to Embodiment 3 of the present invention. 
     As shown in (a) of  FIG. 12 , a recycling manufacturer inserts a tool  202  to the through hole of the pullout member  35  embedded in the intersecting groove  33 . Subsequently, as shown in (b) of  FIG. 12 , the recycling manufacturer pulls the tool  202  to pull out the pullout member  35  from the intersecting groove  33  and at the same time, pull out, from the groove  32 , the split member physically connected to the pullout member  35 . 
     As shown in (c) of  FIG. 12 , the recycling manufacturer then pulls out the whole split member  34  from the groove  32 , thereby allowing the lamp  30  to be split into the upper part and the lower part. 
     It is to be noted that the groove  32  is formed below the LED module holder  103 . Consequently, the LED module  102  is included in an upper case  31   a  while the power supply circuit  104  is included in a lower case  31   b.    
     From the lamp  30  split into the upper part and the lower part as above, the recycling manufacturer then takes out the LED module  102  and the power supply circuit  104  to disassemble the lamp  30 . 
     As above, since the lamp  30  according to this embodiment includes the split member  34 , a recycling manufacturer can split the case  31  by pulling out the split member  34  from the groove, i.e., without using cutting tools. Thus, a recycling manufacturer can easily disassemble the lamp  30 . 
     Furthermore, since the lamp  30  includes the pullout member  35 , a recycling manufacturer can pull out the split member  34  from the groove  32  by pulling out the pullout member  35 , which further facilitates the disassembling of the lamp  30 . 
     Furthermore, since the pullout member  35  is embedded in the intersecting groove  33 , the pullout member  35  can be prevented from being too easily pulled out by a user or unintentionally pulled out (for example, being caught on something), with the result that the case  31  can be prevented from being split at times other than the time of recycling. 
     Furthermore, since the pullout member  35  has a hole, a recycling manufacturer can pull out the pullout member  35  by using the hole, which further facilitates the disassembling of the lamp  30 . 
     Furthermore, since the lamp  30  includes the cover member  36  formed by metal powder coating, the pullout member  35  is concealed. This allows the case  31  to be prevented from being split by a user pulling the pullout member  35 . 
     Embodiment 4 
     Next, Embodiment 4 of the present invention is described. 
     A lamp  40  according to this embodiment includes a split member and a pullout member as in the case of the lamp  30  according to Embodiment 3. However, the groove and the pullout member of the lamp  40  are different from the groove and the pullout member of the lamp  30 . Accordingly, the following describes the lamp  40  according to this embodiment, mainly differences from the lamp  30  according to Embodiment 3. 
       FIG. 13  is a front elevational view of the lamp according to Embodiment 4 of the present invention.  FIG. 14  is an expanded cross-sectional view of the groove formed in the lamp according to Embodiment 4 of the present invention. Specifically,  FIG. 14  is an expanded view of the vicinity of the groove taken along line A 4 -A 4  of  FIG. 13 . In  FIG. 13 , constituents which are the same or like as those in  FIG. 1  are denoted by the same numerals and are not described. 
     A case  41  has, on the outer side, a groove  42  in the circumferential direction. The groove  42  is a through groove and includes a first groove portion  42   a  and a second groove portion  42   b.    
     The first groove portion  42   a  is formed over the entire circumference of the case  41 . Furthermore, the first groove portion  42   a  has a rectangular cross section. 
     The second groove portion  42   b  is formed on the bottom of the first groove portion  42   a  and has a groove width narrower than a groove width of the first groove portion  42   a . The second groove portion  42   b  is formed partially in the circumferential direction of the case  41 . Furthermore, the second groove portion  42   b  has a rectangular cross section. 
     A split member  43  is embedded at least in the second groove portion  42   b  in such a way that the split member  43  is joined to both sides of the second groove portion  42   b  and can be pulled out. 
     A pullout member  44  is a member for pulling out the split member  43  from the groove  42  and is embedded in the first groove portion  42   a . This pullout member  44  is connected to an end of the split member  43 . 
     The pullout member  44  is a quadrangular tubular member. Specifically, the pullout member  44  has a through hole. This through hole is formed in a groove direction of the groove  42 . 
     Furthermore, the pullout member  44  does not always need to have a quadrangular tubular shape. For example, the pullout member  44  may have a circular tubular shape. In addition, the pullout member  44  does not always need to have a through hole. The pullout member  44  may have any shape that allows a recycling manufacturer to easily pull out the pullout member  44  from the groove  42 . For example, the pullout member  44  may have a non-through hole on at least one end. In this case, a recycling manufacturer can hook a tool in this non-through hole and pull out the pullout member  44  from the groove  42 . 
     A disassembling method for the lamp  40  configured as above is the same or like as that for the lamp  30  according to Embodiment 3 and is not described. 
     As above, since the lamp  40  according to this embodiment includes the split member  43 , a recycling manufacturer can split the case  41  by pulling out the split member  43  from the groove, i.e., without using cutting tools. Thus, a recycling manufacturer can easily disassemble the lamp  40 . 
     Furthermore, since the lamp  40  includes the pullout member  44 , a recycling manufacturer can pull out the split member  43  from the groove  42  by pulling out the pullout member  44 , which further facilitates the disassembling of the lamp  40 . 
     Furthermore, since the pullout member  44  is embedded in the groove  42 , the pullout member  44  can be prevented from being too easily pulled out or erroneously pulled out (for example, being caught on something), with the result that the case  41  can be prevented from being split at times other than the time of recycling. 
     Furthermore, since the pullout member  44  has a hole, a recycling manufacturer can pull out the pullout member  44  by using the hole, which further facilitates the disassembling of the lamp  40 . 
     Embodiment 5 
     Next, Embodiment 5 of the present invention is described. 
     A lamp  50  according to this embodiment is different from the lamp  30  according to Embodiment 3 in that a disconnecting unit for disconnecting the power supply line is provided. Accordingly, the following describes the lamp  50  according to this embodiment, mainly differences from the lamp  30  according to Embodiment 3. 
       FIG. 15  is a perspective view of the lamp according to 
     Embodiment 5 of the present invention with a globe, an LED module, and an LED module holder removed. 
     As shown in  FIG. 15 , the lamp  50  includes a disconnecting unit  51  and a regulating unit  52  in addition to the constituents included in the lamp  30  according to Embodiment 3. 
     The disconnecting unit  51  cuts the power supply line  104   a  upon pulling out of the split member  34 . Details of the disconnecting unit  51  will be described later with reference to  FIG. 16 . 
     The regulating unit  52  prevents the power supply line  104   a  from moving toward a blade member  51   b . In this embodiment, so as to prevent the power supply line  104   a  from coming into contact with the blade member  51   b  during ordinary use, the regulating unit  52  regulates the power supply line  104   a  so that the power supply line  104   a  does not move toward the blade member  51   b . In this embodiment, the regulating member  52  is an adhesive tape and fixes the power supply line  104   a  to the inner side of the case  31 . It is to be noted that the regulating unit  52  does not always need to be an adhesive tape. For example, the regulating unit  52  may be an adhesive or a groove or the like formed on the inner side of the case  31 . 
       FIG. 16  is an expanded cross-sectional view of a vicinity of the disconnecting unit of the lamp according to Embodiment 5 of the present invention. As shown in  FIG. 16 , the disconnecting unit  51  includes a blade member attachment  51   a  and a blade member  51   b.    
     The blade member attachment  51   a  is connected to the split member  34 . In this embodiment, the blade member attachment  51   a  is a string member having both ends physically connected to the split member  34  at different positions. 
     The blade member  51   b  is a member having a blade shape, attached to the blade member attachment  51   a . The blade member  51   b  cuts the power supply line  104   a  upon pressure contact of the power supply line  104   a  with an edge of the blade shape. 
     The power supply line  104   a  is disposed so as to pass between the split member  34  and the blade member  51   b . In other words, when the split member  34  is pulled out from the groove  32 , the blade member  51   b  moves toward the power supply line  104   a  and cuts the power supply line  104   a.    
     As above, since the lamp  50  according to this embodiment includes the disconnecting unit  51 , the splitting of the case  31  by the split member  34  accompanies the cutting of the power supply line  104   a . Accordingly, the lamp  50  can be prevented from being used after the case  31  is split, which allows improvement in safety. 
     Furthermore, since the lamp  50  includes the regulating unit  52  which prevents the power supply line  104   a  from moving toward the blade member  51   b , the power supply line  104   a  can be prevented from being cut by the blade member  51   b  at times other than splitting of the case  31 . 
     Although the disconnecting unit  51  cuts the power supply line  104   a  which electrically connects the power supply circuit  104  and the LED module  102  in this embodiment, the disconnecting unit  51  may cut other power supply lines such as a power supply line which electrically connects the base  108  and the power supply circuit  104 . 
     Furthermore, although the disconnecting unit  51  includes the blade member  51   b  in this embodiment, the disconnecting unit  51  does not always need to include the blade member  51   b . For example, the disconnecting unit  51  may include a platy member having a zig-zag side, such as a saw. Alternatively, for example, the disconnecting unit  51  may be a mechanism for simply moving the power supply line  104   a  and the split member  34  in an integrated manner. In this case, the power supply line  104   a  is forced to be pulled out together with the split member  34 , with the result that the power supply line  104   a  is cut at a low-strength position such as a connecting part of the power supply line  104   a  and the LED module  102  or the power supply circuit  104 . 
     Although the lamp according to an implementation of the present invention has been described based on the embodiments, the present invention is not limited to these embodiments. Without departing from the scope of the present invention, the present invention includes an embodiment with some modifications on Embodiments that are conceived by a person skilled in the art, or an embodiment obtained through combinations of the constituents of different Embodiments. 
     For example, although the groove is formed in the circumferential direction in the above embodiments, the groove does not always need to be formed in the circumferential direction. Furthermore, the position of the groove is not limited to the position indicated in the above embodiments. The direction and position of the groove may be appropriately changed depending on the arrangement of components inside the lamp, the shape of the case, or the like. For example, the groove may be formed in the axial direction. 
     Furthermore, although the case is metallic in order to efficiently dissipate the heat generated inside in each of the above embodiments, the case does not always need to be metallic. For example, when the LED module  102  generates less heat or if a resin material or the like having high thermal conductivity will be developed, the case may be made of resin or other material. 
     Furthermore, although the lamp includes the pullout member in each of Embodiments 3 to 5, the pullout member does not always need to be provided as long as a recycling manufacturer can pull out the split member from the groove. For example, the lamp does not need to include the pullout member in the case where the split member has a small through hole in which a tool can be hooked. 
     Furthermore, the present invention can not only be implemented as the lamp, but also be implemented as a lighting apparatus which includes the lamp. A lighting apparatus according to an implementation of the present invention is described with reference to  FIG. 17 . 
       FIG. 17  is a schematic cross-sectional view of a lighting apparatus according to an implementation of the present invention. 
     A lighting apparatus  100  is attached to an indoor ceiling  200  when in use, and includes a lamp  110  and a lighting appliance  120 , as shown in  FIG. 17 , for example. For the lamp  110 , the lamp according to each of the above embodiments can be used. 
     The lighting appliance  120  is to turn on and off the lamp  110  and includes an appliance body  121  which is attached to the ceiling  200 , and a lamp cover  122  which covers the lamp  110 . 
     The appliance body  121  includes a socket  121   a  which is an example of a holding unit. Into the socket  121   a , the base  111  of the lamp  110  is screwed. Through this socket  121   a , electricity is supplied to the lamp  110 . 
     It is to be noted that the lighting apparatus  100  illustrated herein is an example of a lighting apparatus  100  according to an implementation of the present invention. It is sufficient that, in the lighting apparatus  100  according to an implementation of the present invention, at least the holding unit which holds the lamp is included and through this holding unit, electricity is supplied to the lamp  110 . For example, the lighting apparatus  100  may be a lighting apparatus that includes the socket  121   a  into which the base  111  of the lamp  110  is screwed. Furthermore, although the lighting apparatus  100  shown in  FIG. 17  includes one lamp  110 , a plurality of the lamps  110  may be provided. 
     INDUSTRIAL APPLICABILITY 
     The present invention is useful as a lamp which includes a light source having a semiconductor light-emitting device such as an LED, and as a lighting apparatus which includes the lamp. 
     REFERENCE SIGNS LIST 
     
         
           10 ,  20 ,  30 ,  40 ,  50 ,  110  Lamp 
           11 ,  21 ,  31 ,  41 , Case 
           12 ,  22 ,  32 ,  42  Groove 
           22   a ,  42   a  First groove portion 
           22   b ,  42   b  Second groove portion 
           33  Intersecting groove 
           34 ,  43  Split member 
           35 ,  44  Pullout member 
           36  Cover member 
           51  Disconnecting unit 
           51   a  Blade member attachment 
           51   b  Blade member 
           52  Regulating unit 
           100  Lighting apparatus 
           101  Globe 
           102  LED module 
           103  LED module holder 
           103  Power supply circuit 
           104   a  Power supply line 
           105  Resin case 
           106  Resin cap 
           107  Insulating ring 
           108 ,  111  Base 
           120  Lighting appliance 
           121  Appliance body 
           121   a  Socket 
           122  Lamp cover 
           200  Ceiling 
           201  Cutter 
           202  Tool