JP2014053533A - Surface mount coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface mount coil which is capable of reliably obtaining levelness to a substrate and a wide junction area, so as to be stably and firmly mounted, and can also be mounted automatically.SOLUTION: A surface mount coil comprises: a coil assembly 10; a top plate 13 disposed in an outer periphery of the coil assembly in an axial line direction; a first terminal block 14 which is fixed to one end portion of the top plate and to which one end portion 11a of the coil is connected; and a second terminal block 15 which is fixed to the other end portion of the top plate and to which the other end portion 11b of the coil is connected. The first terminal block 14 is disposed on one end face of the coil assembly from the top plate to the outer periphery at an opposite side in a radial direction, and a distal end portion is bent to form a first terminal connection part 14a parallel to the top plate. The second terminal block 15 is disposed on the other end face of the coil assembly from the top plate to the outer periphery at the opposite side in the radial direction, and a distal end portion is parted and bent by a notch 17 to form two second terminal connection parts 15a parallel to the top plate while holding the notch therebetween.

Description

  The present invention relates to a surface mount coil mounted on various circuit boards by soldering or the like.

As is well known, choke coils used for current smoothing and noise removal are surface-mounted on circuit boards in various electronic devices.
FIG. 6 shows a surface mount coil which is given as a conventional example in Patent Document 1 below, and a core (not shown) is inserted and bonded inside an air core coil 1 formed by winding a wire in a spiral shape. At the same time, both ends of the wire rod are bent so as to be parallel to the substrate to be mounted to form soldered connection terminals 2a and 2b, and then soldered to the substrate to thereby change the axis thereof. It is mounted parallel to the board surface.

  By the way, in the conventional surface mount coil which consists of the said structure, since the connection terminals 2a and 2b are formed by bending the both ends of a wire, it is possible to ensure the levelness with respect to a substrate surface. It is difficult, and it is difficult to perform a reliable connection work by automatic mounting, and there is a problem that separation or overturning is likely to occur due to defective solder or vibration due to line contact.

  On the other hand, the following Patent Document 2 relates to the surface mount coil previously proposed by the present applicant, and this surface mount coil has both ends of the lead end of the coil along the length of the ferrite core, and both ends thereof. Each electrode piece made of a metal plate is positioned and supported by a support body arranged along the length of the ferrite core, and the electrode piece is formed by bending to fit the lead end of the coil into the notch, In addition to being electrically connected by solder or the like, two planar portions are formed on each of the electrode pieces at both ends to form a terminal portion that contacts the pattern portion of the printed circuit board.

  According to the surface mount coil having the above-described configuration, the lead ends of the coil are connected to the electrode pieces arranged at the end portions of the ferrite cores, and the electrode pieces are bent to be two at each end portion. Since four planar portions are formed and these planar portions are in contact with each other as terminal portions to the printed circuit board, a wide connection area can be stably secured by the planar portions.

  However, in the surface mount coil, since each of the end portions is connected to the printed circuit board by using the flat surface portions in four places in total, all the flat surface portions are flush with the surface of the printed circuit board. There was a problem that it was difficult to position.

JP 2006-344829 A JP 2009-206421 A

  The present invention has been made in view of the above circumstances, and can reliably ensure a levelness with respect to a substrate and a wide bonding area, thereby enabling stable and strong mounting and corresponding to automatic mounting. It is an object of the present invention to provide a surface mount coil that can also be used.

  In order to solve the above-mentioned problems, a surface mount coil according to the present invention as set forth in claim 1 is a coil assembly in which a wire is wound around the outer periphery of a cylindrical core, and the outer periphery of the coil assembly is along the axial direction thereof. A top plate made of an insulating material, a flat first terminal plate having a base end fixed to one end of the top plate and connected to one end of the wire, and the top plate A flat second terminal plate having a base end portion fixed to the other end portion and connected to the other end portion of the wire. The first terminal plate has a plate surface that is connected to the coil. A first terminal connection portion parallel to the top plate is formed by bending from the top plate along the one end surface of the assembly to the outer periphery on the opposite side of the top plate in the diametrical direction. In addition, the second terminal board has its plate surface Along the entire surface of the other end surface of the assembly, the tip is arranged from the top plate to the outer circumference on the opposite side of the top plate in the diametrical direction, and the tip portion is divided by a notch opening at the tip, and the tip portion Is bent, so that two second terminal connection portions parallel to the top plate are formed with the notch portion interposed therebetween.

  According to a second aspect of the present invention, in the first aspect of the invention, the one end portion of the wire is drawn out to an outer peripheral portion on the opposite side of the top plate in the coil assembly. 1 terminal board is formed in a width dimension smaller than the diameter of the coil assembly, and a convex part protruding along the end of the wire is formed on one side of the width direction. It is a feature.

  Furthermore, the invention according to claim 3 is the invention according to claim 1 or 2, wherein the top plate has a rectangular plate shape in which a longitudinal direction is arranged in an axial direction of the coil assembly, and the longitudinal First and second protrusions whose thickness increases at the corners of the four corners by forming opposing surfaces facing the coil assembly at both ends in the direction as arcuate curved surfaces along the outer peripheral surface of the coil assembly. And the first protrusion located in one diagonal direction is arranged between the first protrusion and the first terminal connection or the second terminal connection. The second protrusion, which is formed to have a plate thickness through which the assembly can pass and is positioned in the other diagonal direction, is the second protrusion and the first terminal connection or the second terminal connection. Between the coil assembly It is characterized in that the yellowtail is formed in the thickness of not pass through.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the first terminal plate and the second terminal plate are each provided with the coil assembly at the tip portion. By being bent toward the side, an engaging portion for sandwiching the coil assembly with the top plate is formed.

  According to the invention described in any one of claims 1 to 4, the first planar terminal bent in parallel with the top plate at the tip of the first terminal plate provided at one end in the axial direction of the coil assembly. Two planar second terminal connection portions that form a terminal connection portion and are bent in parallel to the top plate at the front end portion of the second terminal plate fixed to the other end portion, with the notch portion interposed therebetween. Therefore, one plane can be constituted by the first and second terminal connection portions in total of three locations.

  Therefore, by making the plane formed by the first and second terminal connection portions coincide with the plane of the substrate, the levelness with respect to the substrate can be ensured easily and reliably. In addition, since the first and second terminal connection portions can provide a wide bonding area, stable and strong mounting can be performed. Also, automatic mounting can be easily handled.

  By the way, in general, when the terminal connection portion of the terminal plate is formed in a flat shape, when soldering the terminal plate and the end of the wire rod, when these are dipped in the solder bath, when the terminal plate is pulled up from the solder bath The excess solder may adhere to the surface of the planar terminal connection portion due to surface tension in a thick drum shape at the center, and soldering between the terminal connection portion and the pattern portion of the board may become unstable. is there.

  In this regard, in the surface mount coil according to the present invention, when the second terminal connection portion formed on the second terminal plate is divided by the notch portion at the center portion, when dipping into the solder bath The surplus solder does not adhere to the surface of the second terminal connection portion in the form of a thick drum as described above.

  In the invention according to claim 2, the width dimension of the first terminal plate is formed smaller than the diameter of the coil assembly, and one end portion of the coil wire is pulled out to the outer peripheral portion opposite to the top plate. And the convex part which protrudes along the edge part of the said wire is formed in the one side part of the said width direction of a 1st terminal board. For this reason, when one end of the wire is connected to the first terminal board by soldering, if dipping is performed from the convex portion and the one end of the wire to the solder bath, the plane of the first terminal connecting portion is inclined. Therefore, the first terminal connection portion does not accumulate in the solder when it is pulled up.

  Furthermore, in the invention described in claim 3, the opposing surfaces of the rectangular plate-like top plate in the longitudinal direction opposite to the coil assembly are formed into arcuate curved surfaces along the outer peripheral surface of the coil assembly. First and second protrusions whose thickness increases at the corners and the coil assembly is located in one diagonal direction and the first terminal connection part or the second terminal It is formed so that it can pass between the connecting portions and cannot pass between the second projecting portion located in the other diagonal direction and the first terminal connecting portion or the second terminal connecting portion. doing.

  For this reason, when assembling the coil assembly between the first and second terminal plates at both ends of the top plate, the axial direction of the coil assembly intersects with the longitudinal direction of the top plate, and both ends of the coil assembly are These first and second are respectively inserted from between the first protrusion and the first terminal connection portion or the second terminal connection portion and rotated so that the axis is positioned in the longitudinal direction. A coil assembly can be incorporated between the terminal plates.

  In addition, after the assembly, the coil assembly is sandwiched from the axial direction by the first and second terminal plates, and is sandwiched from the diametrical direction by the top plate and the first terminal connecting portion or the second terminal connecting portion. Thus, it can be stably positioned and held in the U-shaped space formed by the top plate and the first and second terminal plates.

  In this case, according to the fourth aspect of the present invention, the core of the coil assembly can be sandwiched from the diametrical direction by the engaging portions formed on the first terminal plate and the second terminal plate. It becomes possible to improve the holding stability of the.

It is a perspective view which shows one Embodiment of the surface mount coil of this invention. It is a bottom view of FIG. It is a perspective view which shows the top plate of FIG. It is a front view which shows the state of the solder dipping at the time of soldering the one end part of the wire of FIG. 1 to a 1st terminal board. It is a front view which shows other embodiment of this invention. The conventional surface mount coil is shown, (a) is a front view, (b) is a side view.

1 to 4 show an embodiment of a surface mount coil according to the present invention. In the figure, reference numeral 10 denotes a central portion of a coil 11 in which a coated copper wire (wire material) is wound in a solenoid shape. A coil assembly in which a cylindrical ferrite core (hereinafter abbreviated as a core) 12 is inserted.
A top plate 13 made of an insulating material such as a thermoplastic synthetic resin is disposed on the outer periphery of the coil assembly 10 along the axial direction thereof.

  The top plate 13 is formed in a rectangular plate shape having a longitudinal direction in the axial direction and having a short side dimension (width dimension) substantially equal to the diameter of the coil assembly 10. The base end portion of the first terminal plate 14 is embedded and fixed to the portion, and the base end portion of the second terminal plate 15 is fixed to the other end portion in the same manner.

  The first and second terminal plates 14 and 15 are flat plate members made of conductive metal, and are bent at 90 ° at the base end portion, so that the respective plates at the both ends of the top plate 13 are mutually connected. They are arranged with their faces facing each other. The coil assembly 10 is incorporated between the first and second terminal plates 14 and 15.

  Here, the first terminal plate 14 is disposed at a position where the plate surface is brought into contact with one end surface of the core 12 of the coil assembly 10. The first terminal plate 14 is formed to have a width smaller than the diameter of the coil assembly 10 and extends from the top plate 13 to the outer periphery on the opposite side of the top plate 13 in the diameter direction of the coil assembly 10. At the same time, the front end portion is bent along the outer periphery of the coil assembly 10 to form a planar first terminal connection portion 14 a parallel to the top plate 13.

  On the other hand, one end portion 11a of the wire rod of the coil 11 is drawn out to the outer peripheral portion on the opposite side of the top plate 13 in the coil assembly 10, and along the corners formed by bending the first terminal connection portion 14a. Has been placed. And the square convex part 16 which protrudes along the one end part 11a of a wire is formed in the one side part of the width direction of the 1st terminal board 14, and the one end part 11a of a wire is the said convex part 16 From the first to the corners, the first terminal board 14 is connected by soldering.

  In contrast, the second terminal plate 15 has a width dimension substantially equal to the diameter of the coil assembly 10, and the plate surface is brought into contact with the other end surface of the core 12 of the coil assembly 10. The top plate 13 is disposed from the top plate 13 to the outer periphery on the opposite side to the top plate 13 in the diameter direction of the coil assembly 10, and the tip portion is similarly bent along the outer periphery of the coil assembly 10.

  Further, in the second terminal board 15, the bent tip portion is divided by a notch portion 17 formed at the center portion in the width direction and opened at the tip end. Thus, two planar second terminal connection portions 15 a parallel to the top plate 13 are formed at the bent tip portion with the notch portion 17 interposed therebetween.

  Then, the other end portion 11b of the wire rod of the coil 11 is pulled out to the outer peripheral portion on the opposite side of the top plate 13 in the coil assembly 10, and along the corner portion formed by bending the second terminal connection portion 15a. Are connected to the second terminal board 15 by soldering.

  Further, as shown in FIG. 3, the top plate 13 has opposing surfaces 13 a facing the coil assembly 10 at both ends in the longitudinal direction, each having an arcuate curved surface along the outer peripheral surface of the substantially cylindrical coil assembly 10. . As a result, first and second protrusions 18 and 19 are formed at the four corners of the top plate 13 so that the thickness of the top plate 13 increases. Further, an inclined surface 13b is formed between the first protrusion 18 and the side of the top plate 13 so that the plate thickness gradually decreases from the first protrusion 18 toward the side.

  And the 1st projection part 18 located in one diagonal direction of the top plate 13 is a coil between this 1st projection part 18 and the 1st terminal connection part 14a or the 2nd terminal connection part 15a. The assembly 10 is formed to a thickness that allows the assembly 10 to pass therethrough. On the other hand, the second projecting portion 19 located in the other diagonal direction is a coil assembly between the second projecting portion 19 and the first terminal connecting portion 14a or the second terminal connecting portion 15a. It is formed in the plate | board thickness which 10 cannot pass.

FIG. 5 shows another embodiment of the surface mount coil according to the present invention. The difference between the surface mount coil and that shown in FIGS. 1 to 4 is that the first and second terminal boards 14. , 15 in the bent shape of the tip.
That is, in the surface mount coil according to the present embodiment, the distal ends of the first terminal plate 14 and the second terminal plate 15 are bent toward the outer peripheral side of the coil assembly 10, respectively. A locking portion 20 that abuts on the outer peripheral surface of the core 12 is formed.

  Further, the distal end portions of the locking portions 20 are further bent at the distal end portions of the first and second terminal plates 14 and 15 in a direction away from the coil assembly 10, thereby being parallel to the top plate 13. A flat first terminal connecting portion 14a and two second terminal connecting portions 15a are formed.

  According to the surface mount coil having the above configuration, the planar first bent at the front end portion of the first terminal plate 14 provided at one end portion in the axial direction of the coil assembly 10 so as to be parallel to the top plate 13. 1 terminal connection portion 14a is formed, and the second terminal plate 15 provided at the other end is bent so as to be parallel to the top plate 13 and the notch portion 17 is sandwiched therebetween. Since the planar second terminal connection portion 15a is formed, one plane can be constituted by the first and second terminal connection portions 14a and 15a in total of these three locations.

  Moreover, the first terminal connection portion 14a is formed at a position facing the central portion of the top plate 13 in the width direction, and the two second terminal connection portions 15a are respectively formed on both side portions of the top plate 13 in the width direction. Since they are formed at opposing positions, the three first and second terminal connection portions 14a and 15a are arranged at the vertices of a triangle in plan view.

  As a result, by making the plane determined by the first and second terminal connection portions 14a and 15a coincide with the plane of the substrate, it is possible to easily and reliably ensure the levelness with respect to the substrate. In addition, since the first and second terminal connection portions 14a and 15a can obtain a wide bonding area, stable and strong mounting can be performed without causing an increase in size as a surface mounting coil. It is possible to easily cope with automatic mounting.

  Further, in the surface mount coil, since the second terminal connection portion 15a formed on the second terminal plate 15 is divided by the notch portion 17 at the central portion in the width direction, it is dipped in the solder bath. At this time, excessive solder does not adhere to the surface of the second terminal connection portion 15a in a drum shape with a thick central portion.

  In addition, the width dimension of the first terminal plate 14 is formed to be smaller than the diameter of the coil assembly 10, the one end portion 11 a of the wire of the coil 11 is pulled out to the outer peripheral portion on the side opposite to the top plate 13, and the first A convex portion 16 is formed on one side of the terminal plate 14 in the width direction so as to protrude along the one end portion 11a of the drawn wire.

  For this reason, as shown in FIG. 4, when connecting one end portion 11 a of the wire to the first terminal board 14 by soldering, when dipping from the convex portion 16 and the one end portion 11 a side of the wire to the solder tank, Since the plane of the first terminal connection portion 14a is inclined and immersed in the solder bath, as shown by the dotted line → in the figure, excess solder is pulled along the surface of the first terminal connection portion 14a. By flowing down, it is possible to prevent the solder accumulation in the first terminal connection portion 14a.

  Further, the opposing surfaces 13a of the top plate 13 facing the coil assembly at both longitudinal end portions are formed into arcuate curved surfaces along the outer peripheral surface of the coil assembly 10 having a substantially cylindrical shape, so that the thickness of the four corners is reduced. The first projection 18 and the first terminal connection portion 14a or the second terminal connection in which the first and second projections 18 and 19 are formed and the coil assembly 10 is positioned in one diagonal direction. So that it cannot pass between the second protrusion 19 located in the other diagonal direction and the first terminal connection part 14a or the second terminal connection part 15a. Forming.

  Therefore, as shown in FIG. 2, when the coil assembly 10 is assembled between the first and second terminal plates 14 and 15 at both ends of the top plate 13, first, as shown by the dotted line in the drawing, the top plate 13 The axial direction of the coil assembly 10 is arranged so as to intersect the longitudinal direction of the coil assembly 10, and then both end portions of the coil assembly 10 are respectively connected to the first protrusion 18 and the first terminal connection portion 14a or the second terminal connection portion. The coil assembly 10 is inserted into the space 15a and rotated around the center of the axis so that the first and second terminal plates 14 and 15 are elastically bent and the coil assembly 10 is connected to the first and second terminal plates 14. , 15 can be incorporated.

  At this time, since the inclined surface 13b is formed between the first projecting portion 18 and the side portion of the top plate 13, the coil assembly 10 is guided along the inclined surface 13b. The coil assembly 10 can be incorporated between the first and second protrusions 18 and 19.

  After the assembly, the coil assembly 10 is sandwiched from the axial direction by the first and second terminal plates 14 and 15, and the top plate 13, the first terminal connection portion 14a, and the second terminal connection portion 15a. Can be stably positioned and held in the U-shaped space formed by the top plate 13 and the first and second terminal plates 14 and 15.

  Furthermore, according to the surface mount coil shown in FIG. 5, the core 12 of the core 10 of the coil assembly is sandwiched from the diameter direction by the locking portions 20 formed on the first terminal plate 14 and the second terminal plate 15. The holding stability of the coil assembly 10 can be further improved.

DESCRIPTION OF SYMBOLS 10 Coil assembly 11 Coil 11a One end part of a wire 11b Other end part of a wire 12 Ferrite core 13 Top plate 13a Opposite surface 14 1st terminal board 14a 1st terminal connection part 15 2nd terminal board 15a 2nd terminal connection Part 16 Convex part 17 Notch part 18 First protrusion part 19 Second protrusion part 20 Locking part

Claims (4)

A coil assembly in which a wire is wound around the outer periphery of a cylindrical core, a top plate made of an insulating material disposed along the axial direction on the outer periphery of the coil assembly, and a base end portion at one end of the top plate Is fixed and one end of the wire is connected to the flat first terminal plate, and the base end is fixed to the other end of the top plate and the other end of the wire is connected A flat second terminal plate,
The first terminal plate is disposed from the top plate to the outer periphery on the opposite side of the top plate in the diametrical direction with the plate surface along one end surface of the coil assembly, and the tip is bent. A first terminal connection portion parallel to the top plate is formed, and
The second terminal plate is disposed from the top plate to the outer periphery on the opposite side of the top plate in the diametrical direction with the plate surface along the entire other end surface of the coil assembly, and the tip portion is at the tip. It is divided by the notch part which opens, and the 2nd terminal connection part parallel to the top plate is formed on both sides of the notch part by bending the tip part. A featured surface mount coil. The one end of the wire is drawn out to the outer peripheral portion of the coil assembly opposite to the top plate,
The first terminal plate is formed to have a width smaller than the diameter of the coil assembly, and a convex portion protruding along the end of the wire is formed on one side of the width direction. The surface mount coil according to claim 1.   The top plate has a rectangular plate shape whose longitudinal direction is arranged in the axial direction of the coil assembly, and a surface facing the coil assembly at both end portions in the longitudinal direction is along the outer peripheral surface of the coil assembly. By forming an arc curved surface, the first and second protrusions whose thickness increases at the corners of the four corners are formed, and the first protrusions positioned in one diagonal direction are: The first protrusion is formed to have a thickness that allows the coil assembly to pass between the first protrusion and the first terminal connection or the second terminal connection, and is positioned in the other diagonal direction. The two protrusions are formed to have a thickness that prevents the coil assembly from passing between the second protrusion and the first terminal connection part or the second terminal connection part. Claim 1 or 2 Surface mount coil according.   The first terminal plate and the second terminal plate are latched so that the coil assembly is sandwiched between the top plate and the top plate by being bent toward the coil assembly side at the respective tip portions. The surface mount coil according to claim 1, wherein a portion is formed.

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