JP6299560B2 - Surface mount inductor and manufacturing method thereof - Google Patents

Description

  The present invention relates to a surface mount inductor and a method for manufacturing the same.

  Conventionally, surface mount inductors in which coils are sealed with a sealing material having magnetic powder and resin have been widely used. For example, Patent Document 1 discloses a method of manufacturing a surface mount inductor using a lead frame. In this method, the lead end of the coil is welded and joined to the lead frame, and the coil is sealed with a sealing material to obtain a molded body. The lead frame exposed from the molded body is processed to form external terminals.

  Patent Document 2 discloses a method for manufacturing a surface-mount inductor that does not use a lead frame but processes a lead end portion of a coil as an external terminal. In this method, a coil formed by winding a conducting wire having a flat cross section (hereinafter referred to as a flat wire) is sealed with a sealing material to obtain a molded body.

JP 2003-290992 A JP 2004-193215 A

  Since the surface mount inductor disclosed in Patent Document 1 welds and joins the coil and the external terminal, mechanical stress and thermal stress are applied to the joint between the coil and the external terminal. Further, contact resistance is generated at the joint between the coil and the external terminal.

In the surface mount inductor disclosed in Patent Document 2, since the winding axis direction of the coil and the wide surface of the rectangular wire are perpendicular to each other, mechanical stress is applied to the inner and outer diameter portions of the coil when the coil is wound.
In the surface mount inductor disclosed in Patent Document 2, one of the two lead ends of the coil is drawn from the bottom surface of the surface mount inductor toward the bottom surface, and the other lead end is the surface. Since the mounting inductor is drawn from the vicinity of the top surface toward the bottom surface, the length of the leading end is different. For this reason, the shape of the coil is left-right asymmetric. A surface-mount inductor incorporating a left-right asymmetric coil has different electrical characteristics when input to one external terminal and electrical characteristics when input to the other external terminal. Such surface mount inductors often print markings indicating the polarity of the electrical characteristics.

  Therefore, the present invention reduces the thermal stress and mechanical stress on the coil, eliminates the contact resistance generated between the coil and the external terminal, and further, the surface mount inductor of the built-in coil shape is symmetrical. The purpose is to provide a manufacturing method.

  The surface-mount inductor of the present invention includes a coil formed by winding a conductive wire, and a molded body in which the coil is sealed with a sealing material including a resin and a filler, and the coil has both ends of a rectangular conductor with a flat cross section. Are positioned in opposite directions along the winding axis of the coil so that the inner diameter is equal to or larger than the outer diameter of the first winding part. A second winding part wound with a shift, and pulling out the end of the conducting wire from the outer periphery of each second winding part as a lead-out end, the winding axis is parallel to the mounting surface of the molded body, A coil drawer that is sealed with a sealing material so that the surface of the drawer end is exposed on the surface of the mounting surface of the molded body, covers the upper surface, end surface, and side surfaces of the molded body, and the lower end is exposed on the mounting surface of the molded body A pair of metal bodies that reach the same surface as the surface of the end portion are respectively attached to both end faces of the molded body. Attached so as to have a gap between the surface of the led-out ends of the coil to be exposed on the surface of the mounting surface.

According to the surface mount inductor and the manufacturing method thereof of the present invention, by using the lead end of the coil as a terminal, thermal stress and mechanical stress on the coil are reduced, and further, generated between the coil and the external terminal. Contact resistance can be eliminated. In addition, since the winding axis direction of the coil and the wide surface of the coil are parallel, mechanical stress applied to the inner diameter portion and the outer diameter portion during winding can be reduced. Furthermore, because the second winding part is formed by winding the position in the opposite direction along the winding axis of the coil so that the inner diameter of the second winding part is equal to or greater than the outer diameter of the first winding part. Mechanical stress on the conductor can be reduced.
By winding the coil so that the mounting surface of the surface mount inductor and the winding axis direction of the coil are parallel, the shape of the coil can be made symmetrical.
Moreover, since a pair of metal bodies are attached to a molded object, the surface mount inductor of this invention can shield a coil with a metal body, can reduce the noise from the outside, and can reduce the influence on the outside. Furthermore, the surface mount inductor of the present invention can inject a fillet between a terminal and a pair of metal bodies when mounted on a circuit board and soldered, thereby improving the adhesion strength to the circuit board. Can be made.
From the above, thermal stress and mechanical stress on the coil are reduced, resistance value is suppressed, adhesion strength to the board is strong at the time of mounting, it is resistant to external noise, and there is no polarity of electrical characteristics A method for manufacturing a surface-mount inductor can be provided.

It is a perspective view of the coil used in the Example of the surface mount inductor of this invention. It is a figure which shows the winding method of the coil used in the Example of the surface mount inductor of this invention. It is a perspective view of the tablet used in the Example of the surface mount inductor of this invention. It is a top view of the mounting surface of the tablet used in the Example of the surface mount inductor of this invention. It is a figure for demonstrating the Example of the manufacturing method of the surface mount inductor of this invention. It is a figure for demonstrating the Example of the manufacturing method of the surface mount inductor of this invention. It is an external view which shows the surface mount inductor of this invention. It is a figure which shows the inspection method of the surface mount inductor of this invention. It is a figure for demonstrating the Example of the manufacturing method of the surface mount inductor of this invention. It is a perspective view of another coil used in the embodiment of the surface mount inductor of the present invention.

  Embodiments of a surface-mount inductor and a manufacturing method thereof according to the present invention will be described below with reference to the drawings.

  The surface-mount inductor includes a coil formed by winding a winding, a molded body in which the coil is sealed with a sealing material including a resin and a filler, and a metal body that covers the molded body. First, the coil will be described.

  As shown in FIG. 1, the coil 2 used for the surface mount inductor is an air-core coil having a symmetrical shape formed by winding a flat wire having an insulation coating so that both ends thereof are positioned on the outer periphery. is there. The coil 2 includes a first winding portion 2c wound in two stages so that both ends of the flat wire are positioned on the outer periphery, and a coil having an inner diameter equal to or larger than the outer diameter of the first winding portion 2c. And a second winding part 2d wound in a position opposite to each other along the winding axis, and a lead-out end that is an end of a rectangular wire from the outer periphery of each second winding part 2d 2b is pulled out. The lead-out end portions 2b are each pulled out in the direction perpendicular to the winding axis of the coil 2 and opposite to each other, and the ends are bent. Since the coil 2 formed in this way is parallel to the winding axis direction and the wide surface 2a of the flat wire, no mechanical stress is applied to the inner and outer diameter portions of the coil 2 during winding.

A method for winding the coil 2 will be described. The coil 2 is formed by winding a rectangular wire having an insulating coating using a winding machine including a pair of spindles 3 having two winding portions 3a and 3b having different outer diameters.
The pair of spindles 3 has a cylindrical first winding portion 3a and an outer diameter larger than the outer diameter of the first winding portion 3a. A cylindrical second winding portion 3b having a cylindrical shape having an outer diameter larger than the outer diameter of the second winding portion 3b adjacent to the second winding portion 3b with the central axis coinciding with and adjacent to the second winding portion 3b. Each having a wall. The length of each winding portion in the winding axis direction is longer than the length of the width of the rectangular wire used for the coil, and the tip 3c of the spindle 3 is in the direction opposite to the second winding portion 3b. It is an end surface part of the part 3a. As shown in FIG. 2A, the two spindles 3 are arranged so that the tips 3c face each other.

  Next, as shown in FIG. 2B, the wide surface 2a in the middle of the flat wire is brought into contact with the first winding portion 3a, and the outer diameter of the winding is the outer diameter of the second winding portion 3b. The first winding portion 3a is wound in two stages in the winding axis direction so as not to become larger. Thereby, the 1st winding part 2c is formed in the 1st winding part 3a, respectively. Next, both ends of the flat wire are shifted from each other in the opposite direction along the winding axis of the winding portion of the spindle 3 from the first winding portion 3a and wound around the second winding portion 3b. As shown in 2 (c), the second winding portion 2d is formed in the second winding portion 3b. A flat wire is drawn out from the outer periphery of the second winding portion 2b and processed to form a drawing end. The lead-out end portions 2b are each pulled out in the direction perpendicular to the winding axis of the coil 2 and opposite to each other, and the ends are bent. In this state, the coil 2 is heated and, as shown in FIG. 2 (d), the symmetrically shaped coil 2 can be produced by pulling apart the spindles whose tips 3c are in contact with each other.

The molded body 4 will be described. The molded body 4 is formed by combining two tablets 4a. The tablet 4a is formed from a sealing material including a filler having metal magnetic powder and an epoxy resin.
As shown in FIG. 3, the tablet 4a is a cube having an open end on one side surface, and has a space 4b for accommodating the coil 2 therein. A shaft 4c for insertion into the winding shaft of the coil 2 protrudes from the center portion of the inner wall of the surface facing the surface having the open end toward the surface having the open end. A shaft 4c inserted into the winding shaft of the coil 2 is formed in a cylindrical shape.
The upper surface or the bottom surface of the tablet 4a is the mounting surface 4e. As shown in FIG. 4, the mounting surface 4e has a rectangular shape. Of the four sides surrounding the rectangle, the pair of sides facing each other including the side closest to the opening end is the short side, and the other pair of sides. Is the long side. At both ends in the short side direction of the mounting surface 4e, first elongated protrusions 4f protruding in the direction from the inside to the outside of the tablet 4a are provided, and at positions adjacent to the first protrusions 4f, respectively. An elongated slit 4d for pulling out the lead-out end 2b of the coil 2 is provided. In addition, the region surrounded by the short side on the opening end side, the central axis in the longitudinal direction, and the two slits 4d is a second convex portion 4g that protrudes outward from the inside of the tablet 4a. ing.

  Next, a method for sealing the coil will be described with reference to FIGS. 5A and 5B are cross-sectional views taken along the line AA of FIG. 4, FIG. 5C is a plan view of the mounting surface 4e, and FIGS. 6A and 6B are views of FIG. It is BB sectional drawing.

As shown to Fig.5 (a), the tablet 4a is arrange | positioned so that an opening end may face both sides of the coil 2. As shown in FIG. Next, as shown in FIG. 5B, the two tablets 4 a are fitted together so that the tablet shaft 4 c is inserted into the air core portion of the coil 2 from both ends in the winding axis direction of the coil 2. A space 4b for storing the coil 2 is provided inside the tablet 4a, and the coil 2 is stored inside the two tablets 4a. Then, as shown in FIG. 5C, the leading end 2b of the coil is pulled out perpendicularly to the slit 4d from one slit 4d of the mounting surface 4e, and the leading end of the leading end 2b is inserted into the other slit 4d. Subsequently, as shown in FIGS. 6A and 6B, a molding die provided with a die 6 and an upper lid 7 is prepared.
The mold 6 is a metal cube having one open end with a space for accommodating the molded body 4 therein. The bottom surface of the inner wall of the mold 6 is flat, and the area thereof is substantially the same as the area in which two mounting surfaces 4e are arranged side by side. The height of the inner wall on the side surface of the mold 6 is higher than the height of the tablet 4a. The upper lid 7 has a flat bottom surface, and the area of the bottom surface is substantially the same as the area where two mounting surfaces 4e are arranged side by side.
Further, as shown in FIG. 6A, the tablet 4 a having the coil 2 built in the mold 6 is put so that the mounting surface 4 e faces downward, and the upper lid 7 is covered from above the molded body 4. Then, as shown in FIG. 6B in a state where the mold is heated, the first convex portion 4f and the second convex portion 4g are formed by compressing vertically with the upper lid 7 from the upper side to the lower side. The molded body 4 is formed by being crushed and filling the space 4b and the slit 4d with the sealing material constituting the first convex portion 4f and the second convex portion 4g. The surface of the lead-out end 2b of the coil 2 is exposed on the mounting surface 4e of the molded body 4.

  Next, a method for processing the lead end portion into the external terminal will be described. The leading end 2b whose surface is exposed on the mounting surface 4e is irradiated with a laser on the wide surface 2a, and the insulating coating is peeled off. Since a rectangular wire is used, laser peeling conditions can be easily set, and all the external terminals are formed on the same surface, so that the process can be completed in one step. Next, Sn is sputtered on the lead-out end 2b to form a Sn layer, and then Ni and Cr are simultaneously sputtered at a predetermined ratio to form a Ni—Cu layer. By performing sputtering in this way, the lead end 2b can be processed into the external terminal 5. Since a rectangular wire is used, the fixing strength is higher than that of the round wire, and the terminal flatness is also high.

  A pair of left and right metal bodies 8 is mounted on the molded body 4 thus obtained. The relationship between the metal body 8 and the molded body 4 will be described with reference to FIG. FIG. 7A is a plan view when the molded body 4 is viewed from above, and the metal body 8 covers a part of the upper surface of the molded body 8. FIG. 7B is a plan view when the molded body 4 is viewed from below. The metal body 8 does not cover the lower surface of the molded body, and there is a gap between the external terminal 5 and the metal body 8. FIG. 7 (c) is a plan view when viewed from the side surface perpendicular to the winding axis direction of the coil 2 among the four side surfaces of the molded body 4. Most of the side surface of the molded body 4 is the metal body 8. The lower end of the metal body 8 reaches the same surface as the surface of the external terminal exposed on the lower surface of the molded body 4. FIG. 7D is a plan view of the four side surfaces of the molded body 4 when viewed from a side surface parallel to the winding axis direction of the coil 2, and a pair of left and right metal bodies 8 cover both ends of the side surface. There is a gap in the middle of the side. As described above, the molded body 4 is attached with the metal body 8 and becomes the surface mount inductor 1.

  Next, a process for inspecting the surface mount inductor will be described. The surface mount inductor is inspected whether the metal body 8 is correctly attached by an inspection device including a pair of first probe, second probe, and third probe. The surface mount inductor to which the metal body 8 is accurately attached is regarded as a non-defective product, and the position of each probe at the time of inspection is fixed at a position in contact with the metal body attached to the non-defective product. More specifically, the first probe is fixed at a position in contact with the lead-out end 2b of the coil 2 exposed on the mounting surface 4e of the good surface-mount inductor. The second probe is fixed at a position in contact with the lower end and the upper surface of one metal body 8 of a good surface-mount inductor. The third probe is fixed at a position in contact with the lower end and the upper surface of the other metal body 8 of the non-defective surface mount inductor. The relative distance between the probes is also fixed, and when a non-defective surface-mount inductor is inspected, the first probes 9a, the second probes 9b, and the third probes 9c are all electrically connected. The surface mount inductor being inspected is judged to be a good product by the inspection device. When a defective surface-mount inductor in which the metal body 8 is not correctly attached is inspected, any of the probes is not conducted, and the inspected surface-mount inductor is determined to be defective by the inspection apparatus.

An example of a defective surface-mount inductor in which a metal body is not correctly attached will be specifically described.
When the first probe 9a is not conductive, the lower end of the metal body 8 is lower than the surface of the lead-out end 2b of the coil 2 exposed on the mounting surface 4e of the molded body 4 as shown in FIG. Since it reaches the lower side and becomes a factor hindering the mounting of the surface mount inductor, the surface mount inductor being inspected is determined to be defective by the inspection device. As shown in FIG. 8B, when the second probe 9b is not conductive, the lower end of the metal body 8 reaches the surface of the lead-out end portion 2b of the coil 2 exposed on the mounting surface 4e of the molded body 4. Therefore, the surface mount inductor being inspected is determined to be defective by the inspection device. As shown in FIG. 8C, when the third probe 9c is not conductive, the lower end of one side of the metal body 8 is the surface of the leading end 2b of the coil 2 exposed on the mounting surface 4e of the molded body 4. Therefore, the surface mount inductor being inspected is determined as a defective product by the inspection apparatus.
As shown in FIG. 8D, when all of the first probe 9a, the second probe 9b, and the third probe 9c are conductive, the metal body 8 is correctly attached to the molded body 4. As described above, the surface-mounted inductor being inspected is determined to be a non-defective product by the inspection device.

  The surface-mounted inductor 1 obtained in this way has a built-in coil 2 that is symmetrical in shape, so that the electrical characteristics of the surface-mounted inductor 1 can be input from the IN side terminal or from the OUT side terminal during use. Are the same and have no polarity. Therefore, it is not necessary to print markings indicating polarity, and one manufacturing process can be omitted, so that manufacturing costs can be reduced. Further, by attaching the metal body 8, it is possible to prevent the generation of magnetic flux leakage and to block electromagnetic noise from the outside, and to obtain stable electrical characteristics.

As mentioned above, although the Example of the surface mount inductor of this invention and its manufacturing method was described, this invention is not limited to this Example.
For example, the shape of the tablet of the embodiment is such that the pair of facing sides including the side closest to the opening end is the short side and the other pair of facing sides is the long side, but the short side and the long side are reversed. It may be.
Further, as shown in FIGS. 9 (a) and 9 (b), the molding die is a mold end having a shape that is obliquely upward toward the side surface of the inner wall at both ends in the short side direction of the bottom surface of the inner wall. A mold 16 provided with a portion 16a, and an upper lid 17 provided with upper lid end portions 17a that are inclined in a direction in which the outside protrudes vertically downward from the bottom surface and the inside faces toward the center, at both ends in the short side direction of the bottom surface. You may have.
In this case, as shown in FIG. 9A, the tablet 4 a having the coil 2 is housed in the mold 16 and the upper lid 17 is put on. Next, the molded body 4 is formed by compressing with the upper lid 17 in a state where the mold is heated.
By doing so, as shown in FIG. 9B, the sealing material constituting the first convex portion 4f is formed in the direction of the slit 4d by the upper lid end portion 17a of the upper lid 17 and the mold end portion 16a. Therefore, the slit 4d can be efficiently filled with the sealing material.

Furthermore, the coil may be composed of one layer having the same inner diameter, or may be composed of three or more layers having different inner diameters as shown in FIG.
When the coil is composed of two or more layers having different inner diameters, the first winding part, the second winding part,... Number it. An inner diameter of a winding part (X + 1 winding part) obtained by adding 1 to a certain number X is larger than an outer diameter of a winding part (Xth winding part) with a certain number X. For example, as shown in FIG. 10, the coil 12 composed of three layers having different inner diameters has an inner diameter of the second inner winding part larger than the outer diameter of the first inner winding part. The inner diameter of the third inner winding is larger than the outer diameter of the third inner winding. The outer diameter / inner diameter of the innermost winding part of the coil is the smallest, and the outer diameter / inner diameter becomes larger as the outer winding part is reached.
Each winding part of the coil shown in FIG. 1 has two stages, but is not limited to this, and may be wound in four or more stages.
Furthermore, the second winding part when there are three winding parts may be inclined obliquely along the winding axis of the coil.

The spindle requires as many winding portions as the number of coil winding portions. When the spindle has a plurality of winding parts having different outer diameters, the winding parts are numbered as a first winding part, a second winding part,... In order from the winding part having the smallest outer diameter. All the winding parts are cylindrical and are adjacent so that the central axes coincide with each other. From the outer diameter of the winding part numbered X (Xth winding part), add 1 to X The outer diameter of the wound portion (X + 1th winding portion) is larger. One winding portion is prepared more than the winding portion of the coil, and the winding portion having the largest outer diameter is not used for winding the coil but is handled as a stopper.
For example, a spindle used for winding a coil having three winding portions with different inner diameters has a cylindrical first winding portion and a central axis adjacent to the first winding portion, A cylindrical second winding portion having an outer diameter larger than the outer diameter of the first winding portion, and a central axis that is adjacent to the second winding portion and is outside the second winding portion. A cylindrical third winding portion having an outer diameter larger than the diameter, and a central axis that is adjacent to the third winding portion and has an outer diameter larger than the outer diameter of the third winding portion And a columnar wall portion.
Moreover, you may have multiple 2nd winding parts, respectively.
Further, the shape of the spindle may be different as long as it is symmetrical and does not hinder winding. For example, each winding portion may be inclined obliquely along the winding axis of the coil, or between each winding portion may be inclined obliquely along the winding axis of the coil instead of a step.

DESCRIPTION OF SYMBOLS 1 Surface mount inductor 2, 12 Coil 2a Wide surface 2b Draw-out edge part 2c 1st winding part 2d 2nd winding part 3 Spindle 3a 1st winding part 3b 2nd winding part 3c Tip 4 Molding body 4a tablet 4b space 4c shaft 4d slit 4e mounting surface 4f first convex part 4g second convex part 5 external terminal 6 mold 6a mold end 7 upper lid 7a upper lid end 8 metal body 9a first probe 9b first probe 9b first probe 9b Second probe 9c Third probe

Claims (7)

In a surface mount inductor comprising a coil formed by winding a winding, and a molded body in which the coil is sealed with a sealing material including a resin and a filler,
The coil has a first winding portion wound in two stages so that both ends of a conducting wire having a flat cross section are positioned on the outer periphery, and an inner diameter thereof is equal to or larger than an outer diameter of the first winding portion. In this way, there are provided second winding portions wound at different positions along the winding axis of the coil, and the end portions of the conducting wires are drawn out from the outer circumference of each second winding portion. It is sealed with a sealing material so that the winding shaft is parallel to the mounting surface of the molded body and the surface of the drawn end is exposed on the surface of the mounting surface of the molded body,
A pair of metal bodies that cover the upper surface, the end surface, and the side surface of the molded body, and whose lower ends reach the same surface as the surface of the drawing end of the coil exposed on the mounting surface of the molded body, A surface-mount inductor comprising: a metal body; and a coil mounted on the surface of the molded body that is exposed on the mounting surface.   The surface-mount inductor according to claim 1, comprising a plurality of the second winding portions. In a surface mount inductor comprising a coil formed by winding a winding, and a molded body in which the coil is sealed with a sealing material including a resin and a filler,
The coil has a first winding portion wound in two stages so that both ends of a conducting wire having a flat cross section are positioned on the outer periphery, and an inner diameter thereof is equal to or larger than an outer diameter of the first winding portion. In this way, the second winding part wound with the position shifted in the opposite direction along the winding axis of the coil, and the inner diameter is wound so as to be equal to or larger than the outer diameter of the second winding part. A third winding portion, and pulling out the end of the conducting wire from the outer periphery of each third winding portion to be a lead-out end, and the winding shaft is parallel to the mounting surface of the molded body and the lead-out end Sealed with a sealing material so that the surface of the part is exposed on the surface of the mounting surface of the molded body,
A pair of metal bodies that cover the upper surface, the end surface, and the side surface of the molded body, and whose lower ends reach the same surface as the surface of the drawing end of the coil exposed on the mounting surface of the molded body, A surface-mount inductor comprising: a metal body; and a coil mounted on the surface of the molded body that is exposed on the mounting surface. In a method for manufacturing a surface-mount inductor comprising a coil formed by winding a winding, and a molded body in which the coil is sealed with a sealing material including a resin and a filler,
A first winding portion that is wound in two stages such that both ends of the conducting wire are in contact with the spindle of the winding machine and the both ends of the conducting wire are positioned on the outer periphery, and the inner diameter of the first winding portion is a flat wire. A second winding part wound around the winding axis of the coil so as to be equal to or larger than the outer diameter of the winding part and shifted in the opposite direction to each other, from the outer periphery of each second winding part Forming a coil as a lead-out end by pulling out the end of the conducting wire;
Filled with resin so as to have a space for housing the coil from both ends of the coil, a shaft protruding from the inner wall and inserted into the winding shaft of the coil, and a slit for pulling out the leading end of the coil on the side surface A pair of tablets formed using a sealing material containing a material is fitted, heated and compressed, the winding axis is parallel to the mounting surface of the molded body, and the surface of the drawer end is mounted on the molded body Forming a molded body containing the coil so as to be exposed on the surface of the surface;
A pair of metal bodies that cover the upper surface, the end surface, and the side surface of the molded body, and whose lower ends reach the same surface as the surface of the drawing end of the coil exposed on the mounting surface of the molded body, And a step of attaching each of the metal body and the surface of the drawn end portion of the coil exposed on the surface of the mounting surface of the molded body to have a gap. In a method for manufacturing a surface-mount inductor comprising a coil formed by winding a winding, and a molded body in which the coil is sealed with a sealing material including a resin and a filler,
A first winding portion that is wound in two stages such that both ends of the conducting wire are in contact with the spindle of the winding machine and the both ends of the conducting wire are positioned on the outer periphery, and the inner diameter of the first winding portion is a flat wire. A second winding part wound in a direction opposite to each other along the winding axis of the coil so as to be equal to or larger than the outer diameter of the winding part, and an inner diameter of the second winding part outside the second winding part A step of forming a coil having a third winding part wound to have a diameter or more, and pulling out the end of the conducting wire from the outer periphery of each third winding part to form a lead-out end;
Filled with resin so as to have a space for housing the coil from both ends of the coil, a shaft protruding from the inner wall and inserted into the winding shaft of the coil, and a slit for pulling out the leading end of the coil on the side surface A pair of tablets formed using a sealing material containing a material is fitted, heated and compressed, the winding axis is parallel to the mounting surface of the molded body, and the surface of the drawer end is mounted on the molded body Forming a molded body containing the coil so as to be exposed on the surface of the surface;
A pair of metal bodies that cover the upper surface, the end surface, and the side surface of the molded body, and whose lower ends reach the same surface as the surface of the drawing end of the coil exposed on the mounting surface of the molded body, And a step of attaching each of the metal body and the surface of the drawn end portion of the coil exposed on the surface of the mounting surface of the molded body to have a gap. In a method for manufacturing a surface-mount inductor comprising a coil formed by winding a winding, and a molded body in which the coil is sealed with a sealing material including a resin and a filler,
A first winding portion that is wound in two stages such that both ends of the conducting wire are in contact with the spindle of the winding machine and the both ends of the conducting wire are positioned on the outer periphery, and the inner diameter of the first winding portion is a flat wire. A second winding part wound around the winding axis of the coil so as to be equal to or larger than the outer diameter of the winding part and shifted in the opposite direction to each other, from the outer periphery of each second winding part Forming a coil as a lead-out end by pulling out the end of the conducting wire;
Filled with resin so as to have a space for housing the coil from both ends of the coil, a shaft protruding from the inner wall and inserted into the winding shaft of the coil, and a slit for pulling out the leading end of the coil on the side surface A pair of tablets formed using a sealing material containing a material is fitted, heated and compressed, the winding axis is parallel to the mounting surface of the molded body, and the surface of the drawer end is mounted on the molded body Forming a molded body containing the coil so as to be exposed on the surface of the surface;
A pair of metal bodies that cover the upper surface, the end surface, and the side surface of the molded body, and whose lower ends reach the same surface as the surface of the drawing end of the coil exposed on the mounting surface of the molded body, A step of attaching each of the metal body and the surface of the drawn end portion of the coil exposed on the surface of the mounting surface of the molded body to have a gap;
A pair of first probes that contact the leading end of the coil exposed on the mounting surface of the molded body, a pair of second probes that contact the lower end and the upper surface of one metal body, and the other Using an inspection apparatus provided with a pair of third probes in contact with the lower end and the upper surface of the metal body, continuity between the first probes, between the second probes, and between the third probes is confirmed. A method for manufacturing a surface-mount inductor, comprising: a step. In a method for manufacturing a surface-mount inductor comprising a coil formed by winding a winding, and a molded body in which the coil is sealed with a sealing material including a resin and a filler,
A first winding portion that is wound in two stages such that both ends of the conducting wire are in contact with the spindle of the winding machine and the both ends of the conducting wire are positioned on the outer periphery, and the inner diameter of the first winding portion is a flat wire. A second winding part wound in a direction opposite to each other along the winding axis of the coil so as to be equal to or larger than the outer diameter of the winding part, and an inner diameter of the second winding part outside the second winding part A step of forming a coil having a third winding part wound to have a diameter or more, and pulling out the end of the conducting wire from the outer periphery of each third winding part to form a lead-out end;
Filled with resin so as to have a space for housing the coil from both ends of the coil, a shaft protruding from the inner wall and inserted into the winding shaft of the coil, and a slit for pulling out the leading end of the coil on the side surface A pair of tablets formed using a sealing material containing a material is fitted, heated and compressed, the winding axis is parallel to the mounting surface of the molded body, and the surface of the drawer end is mounted on the molded body Forming a molded body containing the coil so as to be exposed on the surface of the surface;
A pair of metal bodies that cover the upper surface, the end surface, and the side surface of the molded body, and whose lower ends reach the same surface as the surface of the drawing end of the coil exposed on the mounting surface of the molded body, A step of attaching each of the metal body and the surface of the drawn end portion of the coil exposed on the surface of the mounting surface of the molded body to have a gap;
A pair of first probes that contact the leading end of the coil exposed on the mounting surface of the molded body, a pair of second probes that contact the lower end and the upper surface of one metal body, and the other Using an inspection apparatus provided with a pair of third probes in contact with the lower end and the upper surface of the metal body, continuity between the first probes, between the second probes, and between the third probes is confirmed. A method for manufacturing a surface-mount inductor, comprising: a step.

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