Choke coil

Abstract

To provide a choke coil that can be made smaller.SOLUTION: A choke coil 10 includes a core, a coil member 30, and a case 40. The case 40 has a housing part 46 defined by an upper surface 42 and a side surface 44. The coil member 30 is constituted by a lead wire and has a coil main part 32, an extension part 34, and a terminal part 36. The coil main part 30 is wound around the core. The core and the coil main part 30 are housed in the housing part 46. The extension part 34 extends from the core main part 32, and has a cross-sectional shape substantially the same as that of the coil main part 30. The extension part 34 has at least one bent part 341 and is at least partially drawn out to the outside of the housing part 46. The terminal part 36 extends from the extension part 34 and has a thickness smaller than the size of the diameter of the extension part 34. The terminal part 36 has an L-shaped form. The boundary 35 between the terminal part 36 and the extension part 34 is located on the side surface 44 of the case 40.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a choke coil, and more particularly to a surface mount type choke coil. [Background technology]

[0002] Patent Document 1 discloses an example of a surface mount type choke coil.

[0003] The choke coil of Patent Document 1 has a closed magnetic circuit core composed of a plate-shaped core and a concave core, and two coils wound concentrically. The coil is attached to the central magnetic leg of the concave core and housed in the closed magnetic circuit core. The lead end of the coil is formed into a plate shape by rolling. A claw portion is formed at the tip of the lead end. The lead end is drawn out to the outside of the closed magnetic circuit core and is arranged along a lead-out groove formed on the outer side surface of the concave core. The claw portion of the lead end is received in a recess formed on the outer bottom surface of the concave core. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2000-021655 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the choke coil of Patent Document 1, the lead end (plate-shaped portion) extends from inside the closed magnetic core. In other words, the closed magnetic core partially accommodates the lead end. Therefore, the closed magnetic core of the choke coil of Patent Document 1 has a size larger than the size required to accommodate the coil.

[0006] An object of the present invention is to provide a choke coil that can be made smaller. [Means for solving the problem]

[0007] The present invention provides a first choke coil including a core, a coil member, and a case, the case has a top surface and a side surface extending downward from the top surface, and has a storage portion defined by the top surface and the side surface, The coil member is made of a lead wire and has a coil main portion, an extension portion, and a terminal portion, The coil main portion is wound around the core, The core and the coil main portion are accommodated in the accommodation portion, the extension portion extends from the coil main portion and has substantially the same cross-sectional shape as the coil main portion; The extension portion has at least one bent portion and is at least partially drawn out to the outside of the receiving portion, The terminal portion extends from the extension portion and has a thickness smaller than a diameter of the extension portion, The terminal portion has an L-shape, The boundary between the terminal portion and the extension portion is located on the side surface of the case. A choke coil is provided.

[0008] In addition, the present invention provides a first choke coil as the second choke coil, The core has a closed annular shape. A choke coil is provided.

[0009] Furthermore, the present invention provides a third choke coil, which is the first choke coil, The terminal portion is at least partially covered with solder, The thickness of the terminal portion is equal to or greater than 1 / 4 and equal to or less than 3 / 4 of the diameter of the extension portion. A choke coil is provided.

[0010] Furthermore, the present invention provides a fourth choke coil, which is the third choke coil, The thickness of the terminal portion is 0.2 mm or more and 0.6 mm or less. A choke coil is provided.

[0011] Furthermore, the present invention provides a fifth choke coil, which is the first choke coil, At least two holes are provided in the top surface of the case, The extension is extended through the hole onto the top surface of the case. A choke coil is provided.

[0012] Furthermore, the present invention provides a sixth choke coil, which is the fifth choke coil, At least two grooves each connected to the hole are further formed on the top surface of the case, The grooves each have an end remote from the hole, The distance between the ends is greater than the distance between the holes. A choke coil is provided.

[0013] Furthermore, the present invention provides a seventh choke coil, which is the first choke coil, The case is made of one piece, The terminal portion protrudes downward from the bottom end of the case. A choke coil is provided. Effect of the Invention

[0014] In a choke coil according to one aspect of the present invention, the coil member is made of a lead wire and has a coil main portion, an extension portion, and a terminal portion. The coil main portion is wound around a core and is housed together with the core in a housing portion of the case. The extension portion extends from the coil main portion and is at least partially drawn out to the outside of the housing portion. The terminal portion extends from the extension portion. The boundary between the terminal portion and the extension portion is located on a side surface of the case. Because the terminal portion is located outside the case, the choke coil according to one aspect of the present invention can be made smaller than conventional choke coils in which the terminal portions extend from inside the case to the outside. [Brief description of the drawings]

[0015] [Figure 1] 1 is a bottom perspective view showing a choke coil according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a top perspective view showing the choke coil of FIG. [Diagram 3] 2 is a bottom view showing the choke coil of FIG. 1. [Figure 4] FIG. 2 is a plan view showing the choke coil of FIG. [Diagram 5] 2 is a bottom perspective view showing a core case that houses a core used in the choke coil of FIG. 1 and a lead wire partially wound around the core case. FIG. [Figure 6] 6 is a bottom perspective view showing an assembly in which the core case and the lead wires in FIG. 5 are combined with a case. [Figure 7] FIG. 7 is a plan view showing the assembly of FIG. 6. [Figure 8] 7 is a top perspective view of the assembly of FIG 6. The lead wires are bent to fit into the upper grooves of the case. [Figure 9] 9 is a top perspective view of the assembly of FIG 8, where the ends of the leads have been cut and pressed. [Figure 10] FIG. 4 is a top perspective view showing a choke coil according to a second embodiment of the present invention. [Figure 11] 10 is a bottom perspective view showing the choke coil of FIG. 9. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] (First embodiment) 1 to 4, a choke coil 10 according to a first embodiment of the present invention includes a core (not shown) housed in a core case 20, two coil members 30, and a case 40. In this embodiment, the choke coil 10 is a common mode choke coil. However, the present invention is not limited to this. The choke coil of the present invention may also be a normal mode choke coil including one coil member 30.

[0017] 3 and 5, the core (not shown) housed in the core case 20 is made of a ferromagnetic material and has a closed annular shape. In this embodiment, the core is a toroidal core having a circular annular shape. However, the present invention is not limited to this. The core may be in a racetrack shape, an oval shape, or an elliptical shape. However, a toroidal core is preferred to obtain the desired magnetic characteristics. Also, when the choke coil 10 is a normal mode choke coil, the core may have a gap.

[0018] As shown in FIG. 3 and FIG. 5, the core case 20 is made of insulating resin and has an annular portion 22, a protrusion 24, and a frame portion 26. The annular portion 22 is hollow and accommodates a core (not shown) therein. The protrusion 24 protrudes radially outward from the annular portion 22. The protrusion 24 restricts the movement of the coil member 30 wound around the core case 20. The frame portion 26 surrounds the annular portion 22 so as to divide the annular portion 22 in two. As can be seen from FIG. 3, the frame portion 26 has an asymmetric shape, and the case 40 has a recess corresponding to the shape of the frame portion 26. Therefore, the core case 20 cannot be inserted into the case 40 unless it is oriented in an appropriate direction. In other words, the frame portion 26 functions as a guide when the core case 20 is accommodated in the case 40. As a result, the lead wire 300 can be correctly and easily inserted into the hole 421 (see FIG. 4). In this way, the frame portion 26 facilitates the assembly work of the choke coil 10 and prevents assembly errors. Furthermore, the frame portion 26 of the core case 20 and the recess in the case 40 restrict movement of the core case 20 relative to the case 40 after the core case 20 is housed in the case 40. Note that in order to prevent movement of the core case 20 relative to the case 40, the core case 20 may be fixed to the case 40 using an adhesive or the like.

[0019] 1 to 4, each of the coil members 30 has a coil main portion 32, two extension portions 34, and two terminal portions 36. In each of the coil members 30, the coil main portion 32 is located in the center of the coil member 30 (between the two extension portions 34), and is wound around a core (not shown) via the core case 20. The extension portions 34 extend from both ends of the coil main portion 32, respectively. The terminal portions 36 extend from the extension portions 34, respectively. The terminal portions 36 are located at both ends of the coil member 30.

[0020] As can be seen from Figs. 1 and 2, the case 40 is a component made of thermosetting resin. The case 40 has a top surface 42 and side surfaces 44. The side surfaces 44 extend downward from the top surface 42. In this embodiment, the side surfaces 44 are composed of four side surface portions 441, 443, 445, and 447. However, the present invention is not limited to this. The side surfaces 44 may have other shapes, such as a polygonal shape or a cylindrical shape. In this embodiment, the up-down direction is the Z direction. The +Z direction is upward, and the -Z direction is downward.

[0021] As can be seen from FIG. 1 and FIG. 3, the top surface 42 and the side surface 44 define a storage section 46. In other words, the case 40 has a storage section 46 defined by the top surface 42 and the side surface 44. In this embodiment, the case 40 opens downward. In other words, in this embodiment, the case 40 does not have a bottom surface. However, the present invention is not limited to this. The case 40 may have a bottom surface. However, as long as insulation between the coil main part 32 and the substrate when the choke coil 10 is mounted on the substrate (not shown), it is preferable that the case 40 does not have a bottom surface, since this allows for reduction in manufacturing costs and simplification of the manufacturing process.

[0022] As shown in Figures 1 and 3, the core case 20 that houses the core (not shown) and the coil main portion 32 are housed in the housing portion 46 of the case 40. As shown in Figures 1, 2 and 4, the extension portion 34 is at least partially drawn out to the outside of the housing portion 46. The extension portion 34 has at least one bent portion 341 and extends along the top surface 42 and the side surface 44 of the case 40. In this embodiment, each of the extension portions 34 has two or three bent portions 341. The terminal portion 36 extends from the side surface 44 of the case 40 to the underside of the case 40.

[0023] 4 and 7, at least two holes 421 are provided in the top surface 42 of the case 40. In this embodiment, four holes 421 are provided in the top surface 42 of the case 40. The holes 421 are divided into two sets. These sets of holes 421 respectively correspond to the coil members 30. The extensions 34 of the coil members 30 are led out from the accommodation portions 46 of the case 40 onto the top surface 42 of the case 40 through the corresponding holes 421.

[0024] As shown in Figs. 4 and 7, at least two upper grooves (groove portions) 423 are further formed on the upper surface 42 of the case 40. In this embodiment, four upper grooves 423 are formed on the upper surface 42 of the case 40. In this embodiment, the upper grooves 423 are grooves that partially do not have a bottom. The upper grooves 423 correspond to the holes 421, respectively. The upper grooves 423 extend from the corresponding holes 421 to the side surface 44 of the case 40, and have ends 425 at positions away from the holes 421. In this embodiment, the extension portion 34 is at least partially received in the upper grooves 423 and extends along the upper grooves 423.

[0025] As can be seen from Figures 1, 2 and 3, the side surface portions 441, 443, 445, 447 constituting the side surface 44 face in different directions. The side surface portions 441, 443 face forward and backward, respectively, in the front-rear direction perpendicular to the up-down direction. The side surface portions 445, 447 face outward in the lateral direction perpendicular to both the up-down direction and the front-rear direction. In this embodiment, the front-rear direction is the X direction. The -X direction is the front, and the +X direction is the rear. The lateral direction is the Y direction.

[0026] 1 to 4 and 6, side grooves 451 are formed in the side surface 44 of the case 40, each of which is continuous with the upper groove (groove portion) 423. In this embodiment, two upper grooves 423 are formed in each of the side surface portions 441 and 443. The side grooves 451 extend in the vertical direction from the end portion 425 of the upper groove 423 to the lower end of the case 40. The extension portion 34 of the coil member 30 is partially received in the corresponding side groove 451 and extends along the side groove 451.

[0027] As shown in FIG. 1, the terminal portion 36 is bent and has an L-shape. In other words, the terminal portion 36 has a first portion 361 extending from the extension portion 34 and a second portion 363 extending from the first portion 361. The first portion 361 extends in the up-down direction and is received in the side groove 451. The second portion 363 is located on the lower side of the case 40 and extends in the front-rear direction. The second portion 363 also protrudes downward from the lower end of the case 40. Since the terminal portion 36 protrudes downward from the lower end of the case 40, when the choke coil 10 is mounted on a board (not shown), only the terminal portion 36 contacts the board. At this time, the case 40, the core case 20, and the coil main portion 32 do not contact the board. That is, the choke coil 10 is supported only by the terminal portion 36. Thus, in this embodiment, the choke coil 10 is supported only by the terminal portion 36, but there is no decrease in mounting strength, and the terminal portion 36 can be reliably connected to the board. However, the present invention is not limited to this. The lower end of the case 40 may be in contact with the board. However, a configuration in which only the terminal portion 36 is in contact with the board is preferable because it is possible to more reliably ensure insulation between the coil main portion 32 and the board even if the case 40 does not have a bottom surface.

[0028] As shown in FIG. 1 and FIG. 2, the boundary 35 between the extension 34 and the terminal 36 is located on the side 44 of the case 40 or in the side groove 451. In the vicinity of the boundary 35, the extension 34 and the terminal 36 extend in the same direction (up and down direction). In other words, the coil member 30 is not bent at the boundary 35. Here, the extension 34 and the terminal 36 have different cross-sectional shapes. If the coil member 30 is bent at the boundary 35 where the cross-sectional shapes are different, the strength is likely to decrease at that portion. In this embodiment, since the coil member 30 extends straight in the vicinity of the boundary 35, such a decrease in strength does not occur. In addition, since the entire terminal 36 or the boundary 35 is located outside the case 40, it is possible to realize a smaller size than a conventional choke coil in which the terminal extends from the inside to the outside of the case.

[0029] As can be seen from Fig. 5, each of the coil members 30 is made of a lead wire 300. In other words, the lead wire 300 is used to manufacture the choke coil 10. In this embodiment, the lead wire 300 is an integrated member made of a solid conductor (not shown) and an insulating coating (not shown) surrounding the conductor.

[0030] 5, during manufacturing, a portion of the lead wire 300 is wound around the core case 20. The portion of the lead wire 300 wound around the core case 20 becomes the coil main portion 32. The extension portion 34 is a portion that extends from the coil main portion 32. The terminal portion 36 is formed later by subjecting a portion of the lead wire 300 to pressing and bending.

[0031] As can be seen from Fig. 5, there is no clear boundary between the coil main portion 32 and the portion that becomes the extension portion 34. Therefore, the extension portion 34 has substantially the same cross-sectional shape as the coil main portion 32. Here, "the extension portion 34 and the coil main portion 32 have substantially the same cross-sectional shape" means that their cross-sectional shapes are the same except for the portion that is deformed by bending. In this embodiment, the cross-sectional shape is circular.

[0032] 6 and 7, during the manufacture of the choke coil 10, the core case 20 around which the lead wire 300 is wound is inserted into the housing portion 46 from below the case 40. As a result, the core case 20 housing the core (not shown) and the coil main portion 32 are housed in the housing portion 46. At this time, both ends of the lead wire 300 are pulled out to the outside of the case 40 through the corresponding holes 421.

[0033] Here, the diameter of the conductor (not shown) of the lead wire 300 used in the coil member 30 may be determined depending on the application of the choke coil 10. In this embodiment, the diameter of the conductor is 0.8 mm or more to accommodate a relatively large predetermined current. Also, in this embodiment, the diameter of the conductor is 1.8 mm or less in consideration of ease of processing.

[0034] Moreover, the inner diameter of hole 421 of case 40 is slightly larger than the outer diameter of coil member 30. It is preferable that the inner diameter of hole 421 is small. This is to prevent a decrease in the strength of case 40 and to prevent heat from entering case 40 during the reflow process in which choke coil 10 is mounted on a substrate (not shown).

[0035] As shown in FIG. 8, the lead wire 300 is bent to fit into the upper groove (groove portion) 423 and is partially received in the upper groove 423. The end of the lead wire 300 is then cut to an appropriate length. Solder (not shown) is formed on the surface of the end of the lead wire 300 after cutting, as necessary. The insulating coating is removed from the portion that will become the terminal portion 36 of the lead wire 300 (see FIG. 9) when the solder is formed. If the solder is not formed, it is necessary to remove the insulating coating from the portion that will become the terminal portion 36 of the lead wire 300.

[0036] As shown in Fig. 9, the end of the lead wire 300 (see Fig. 8) is pressed to form a plate-like portion 38 that will become the terminal portion 36. At this time, a boundary 35 is formed between the extension portion 34 of the coil member 30 and the terminal portion 36. Since only a limited range of the lead wire 300, i.e., the portion that will become the terminal portion 36, is pressed, it is possible to use a small press. Also, the ends of a plurality of lead wires 300 can be pressed simultaneously.

[0037] As can be seen from FIG. 9, FIG. 1 and FIG. 2, the plate-shaped portion 38 is then bent to become the terminal portion 36. In this manner, the terminal portion 36 is formed by pressing the conductor of the lead wire 300 (see FIG. 8) and then bending it. In other words, the terminal portion 36 is not a separate part connected to the lead wire 300 by welding or the like. In this embodiment, the terminal portion 36 is at least partially covered with solder. The solder may be formed after the formation of the terminal portion 36. However, if solder is formed after the press working, problems such as uneven soldering are likely to occur, so it is preferable to form the solder before the press working as described above.

[0038] As can be seen from FIG. 9, the thickness of the plate-shaped portion 38 that becomes the terminal portion 36 is smaller than the diameter of the extension portion 34. More specifically, the thickness of the plate-shaped portion 38 is ¼ to ¾ of the diameter of the extension portion 34. The thickness of the plate-shaped portion 38 may be, for example, 0.2 mm to 0.6 mm. If the thickness of the plate-shaped portion 38 is too small, cracks are likely to occur in the solder during bending. Also, if the thickness of the plate-shaped portion 38 is too large, bending becomes difficult. In this embodiment, the thickness of the terminal portion 36 is equal to the thickness of the plate-shaped portion 38. That is, in this embodiment, the size of the terminal portion 36 is ¼ to ¾ of the diameter of the extension portion 34. Also, in this embodiment, the thickness of the terminal portion 36 may be 0.2 mm to 0.6 mm.

[0039] As can be seen from Figs. 9 and 2, the extension 34 is further bent to fit along the side groove 451. This causes the first portion 361 of the terminal 36 to be received in the side groove 451. As a result, the distance between the two terminals 36 of each of the coil members 30 is determined. Since the distance between the terminals 36 depends on the size of the case 40, there is little variation between products. Thus, according to this embodiment, the distance (pitch) between the terminals 36 of each of the coil members 30 can be accurately determined by the simple process of bending the extension 34.

[0040] As can be seen from FIG. 7, the distance D1 between the ends 425 of the two upper grooves 423 extending from the two holes 421 of each set is longer than the distance D2 between the two holes 421 of each set. Since the side grooves 451 extend along the up-down direction, the distance between the side grooves 451 in the front-rear direction depends on the distance D1 between the ends 425 of the upper grooves 423. As a result, as can be seen from FIG. 3 and FIG. 4, the distance between the terminals 36 of the coil member 30 in the front-rear direction depends on the distance D1 between the ends 425 of the upper grooves 423 and is longer than the distance D2 between the holes 421. Thus, according to this embodiment, the distance between the terminals 36 can be made longer than the distance between the positions (holes 421) where the extensions 34 are drawn out to the outside of the case 40. This is advantageous in ensuring insulation between the pads to which the terminals 36 are connected when the choke coil 10 is mounted on the board. Moreover, since the distance between the terminals 36 depends on the distance D1 between the ends 425, variation is unlikely to occur. Therefore, this configuration is advantageous for making the choke coil 10 smaller.

[0041] As can be seen from Fig. 2, in this embodiment, the extension 34 is routed from the top surface 42 to the side surface 44 of the case 40. In other words, in this embodiment, the coil member 30 is arranged so that the portion of the coil member 30 exposed to the outside of the case 40 is long. As a result, heat generated in the coil member 30 is efficiently discharged to the outside of the case 40. Therefore, the configuration of the choke coil 10 in this embodiment has excellent heat dissipation efficiency and is suitable for large current applications.

[0042] (Second embodiment) 10 and 11, a choke coil 10A according to the second embodiment of the present invention differs from choke coil 10 according to the first embodiment in that it has a case 40A instead of case 40.

[0043] As can be seen from Figs. 10 and 11, the case 40A has a main body 400 and an upper lid 410. The main body 400 has a bottom surface 402 and a side surface 404 extending upward from the bottom surface 402. The main body 400 opens upward and has an upper opening (not shown). The upper lid 410 is combined with the main body 400 to close the upper opening of the main body 400. The upper lid 410 and the side surface 404 of the main body 400 define a core case (not shown) that houses a core (not shown) and an accommodation portion (not shown) that houses a coil main portion (not shown) of the coil member 30.

[0044] 10 and 11, in this embodiment, the extension 34 of the coil member 30 is pulled out from inside the case 40A at the upper end of the side surface 404 of the case 40A and extends downward. Thus, in the present invention, the extension 34 may be pulled out from the side surface 404 of the case 40A to the outside of the case 40A and extend along the side surface 404 of the case 40A. However, pulling the coil member 30 out from the top surface 42 of the case 40, as in the choke coil 10 according to the first embodiment, provides a longer portion exposed to the outside of the case 40 and is therefore superior in heat dissipation.

[0045] As shown in Figures 10 and 11, in this embodiment as well, the boundary 35 between the extension 34 and the terminal 36 is on the side surface 404 of the case 40A. Moreover, in the vicinity of the boundary 35, the extension 34 and the terminal 36 extend in the same direction. In other words, the lead wire is not bent at the boundary 35 between the crushed and non-crushed parts of the lead wire. Therefore, a predetermined strength is maintained at the boundary 35 of the coil member 30. Moreover, since the entire terminal 36 or the boundary 35 is outside the case 40A, it can be made smaller than a conventional choke coil in which the terminal extends from the inside to the outside of the case 40.

[0046] Although the present invention has been described above with reference to several embodiments, the present invention is not limited to the above-described embodiments, and various modifications and changes are possible without departing from the spirit and scope of the present invention.

[0047] For example, in the above embodiment, the coil member 30 (lead wire 300) is wound around the core case 20 that houses the core (not shown), but the coil member 30 (lead wire 300) may also be wound around a core (painted core) whose surface is painted with insulating paint.

[0048] Furthermore, in the above embodiment, the case 40 is made of a thermosetting resin, but the case 40 may be made of other insulating materials such as ceramic. [Explanation of symbols]

[0049] 10 Choke coil 20 Core Case 22 Circular section 24 Protrusion 26 Frame section 30 Coil material 300 Lead Wire 32 Main coil section 34 Extension 341 Bending section 35 Boundary 36 Terminal section 361 Part 1 363 Part 2 38 Plate-shaped part 40,40A Case 400 Body 402 Bottom 404 Side 410 Top lid 42 Top surface 421 hole 423 Upper groove (groove section) 425 End 44 Side 441,443,445,447 Side part 451 Side Ditch 46 Storage unit

Claims

1. A choke coil comprising a core, a coil member, and a case, the case has a top surface and a side surface extending downward from the top surface, and has a storage portion defined by the top surface and the side surface, The coil member is made of a lead wire and has a coil main portion, an extension portion, and a terminal portion, The coil main portion is wound around the core, The core and the coil main portion are accommodated in the accommodation portion, the extension portion extends from the coil main portion and has substantially the same cross-sectional shape as the coil main portion; The extension portion has at least one bent portion and is at least partially drawn out to the outside of the receiving portion, The terminal portion extends from the extension portion and has a thickness smaller than a diameter of the extension portion, The terminal portion has an L-shape, The boundary between the terminal portion and the extension portion is located on the side surface of the case. Choke coil.

2. 2. The choke coil according to claim 1, The core has a closed annular shape. Choke coil.

3. 2. The choke coil according to claim 1, The terminal portion is at least partially covered with solder, The thickness of the terminal portion is equal to or larger than ¼ and equal to or smaller than ¾ of the diameter of the extension portion. Choke coil.

4. 4. The choke coil according to claim 3, The thickness of the terminal portion is 0.2 mm or more and 0.6 mm or less. Choke coil.

5. 2. The choke coil according to claim 1, At least two holes are provided in the top surface of the case, The extension is extended through the hole onto the top surface of the case. Choke coil.

6. 6. The choke coil according to claim 5, At least two grooves each connected to the hole are further formed on the top surface of the case, The grooves each have an end remote from the hole, The distance between the ends is greater than the distance between the holes. Choke coil.

7. 2. The choke coil according to claim 1, The case is made of one piece, The terminal portion protrudes downward from the bottom end of the case. Choke coil.

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