KR19980042442A - Coil-type Electronic Components and Manufacturing Method Thereof - Google Patents

Abstract

To improve the reliability, mountability, and productivity of the coil type electronic component. Angled blades 1b are formed at both ends of the core 1a having a substantially circular cross section. In the blade 1b, the groove | channel 2 is formed in each side surface, and the electrically conductive film 3 for external electrodes is formed in addition. The coil 4 is wound around the core 1a. The leader line to the terminal 5 of the coil 4 is connected to the conductive film 3 for external electrodes in the groove 5. On the coil 4, the exterior material 6 is provided. This exterior packaging material 6 has a rectangular pillar shape along the shape of the blade 1b, and its surface 6a is flattened.

Description

Coil-type Electronic Components and Manufacturing Method Thereof

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to coil type electronic components such as inductors, transformers, choke coils, and the like.

As a coil type electronic component, various things have already been put into practical use, and various improvement has been carried out. For example, in Japanese Patent Application Laid-Open No. 51-115547, a coil is wound around a core portion of a core having a blade portion at an end, a conductive layer is formed on the main surface of the blade portion, and an end of the lead wire of the coil is formed on the conductive layer. The fixed inductance element which connected and connected also to the electrically conductive part of a printed circuit board is disclosed. Japanese Patent Application Laid-Open No. 56-110612 discloses an inductance element in which a groove is formed in a blade portion and a coil end is accommodated in the groove.

Japanese Laid-Open Patent Publication No. 57-73916 discloses a small inductor in which an end portion of a coil wound around a core is connected to a conductor layer formed on a blade portion of a core end, and an electrode is formed on a cross section after resin sealing. . Further, Japanese Patent Application Laid-Open No. 61-144616 discloses a tip coil in which a coil lead-out groove is provided in a rectangular blade portion to draw out a lead wire and an electrode is also provided in the side of the blade portion.

As described above, the coil-type electronic component has a structure in which a coil is wound around the core portion and the lead wire of the coil is joined to the electrode of the blade portion. Such a coil type electronic component is manufactured by the method as shown in FIG. 27, for example. First, as shown in the same figure (A), the winding core provided with the blade part 902 in the edge part of the core part 900, respectively is prepared. Next, as shown to the same figure (B), the electrode 904 is formed in the side surface and end surface of the blade part 902 by the dip method etc. Next, as shown in the drawing (C), the coil 906 is wound around the core portion 900, and the leader line 908 is bonded to the electrode 904 by, for example, thermocompression bonding. .

Next, as shown in the same drawing (D), resin or paint is applied as the exterior 901 to the core portion on which the coil 906 is wound. Thereafter, as shown in the drawing (E), plating 12 by Ni or the like is applied to a portion of the electrode 904. Moreover, as shown to the same figure F, it shape | molds so that the whole may become a square pillar shape, for example.

However, in recent years, along with the progress of miniaturization and weight reduction of electromagnetic products, miniaturization and weight reduction have been strongly demanded for coil-type electronic components. Moreover, from a viewpoint of cost reduction, improvement of mountability and improvement of productivity are calculated | required.

In the present invention, attention has been paid to these points, and its object is to reduce the size and weight of the coil-type electronic component without causing a decrease in performance and reliability. Another object is to improve the mountability and productivity of the coil type electronic component.

The coil type electronic component of this invention is winding core containing a core and the blade provided in the both ends; An external electrode formed on the blade; A coil wound around the core and having a lead wire connected to the external electrode; And an exterior member formed on the coil and having a flattened surface.

The manufacturing method of the coil-type electronic component of this invention is the process of processing the core body for core winding, and obtaining the core containing a core and a blade; Forming an external electrode on the blade; Winding a coil around the core and connecting the lead wire to the external electrode; And installing a packaging material having a planarized surface in the coil.

The above and other objects, features, and advantages of the present invention are apparent from the following detailed description and the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view, sectional drawing, and the side view of a modification which show an example of the basic form of the tip inductor which concerns on this invention.

FIG. 2 is a sectional view of a core having a conductive film for external electrodes different from that of FIG. 1, and a plan view showing a connection structure of another coil; FIG.

3 is a perspective view and a cross-sectional view showing an example of another tip-shaped inductor.

4 is a cross-sectional view showing an example of another tip-shaped inductor.

5 is a perspective view and a sectional view showing a main step in one example of a method for manufacturing a core according to the present invention.

6 is a cross-sectional view showing an example of a method of manufacturing another winding;

7 is a perspective view, a sectional view and a side view showing another example of the manufacturing method.

8 is a cross-sectional view showing an example of another method of manufacturing a core and an electrode.

9 is a side view, a sectional view, and a sectional view showing an example of a still further core and an electrode manufacturing method.

10 is a cross-sectional view showing an example of another method of manufacturing a coil-type electronic component.

11 is a perspective view illustrating an example of a cap used in the method of FIG. 10.

12 is a perspective view and a cross-sectional view showing an example of the manufacturing method of the core;

13 is a cross-sectional view showing an example of a method of manufacturing another winding;

Fig. 14 is an enlarged sectional view showing an example of a method of manufacturing another coiled electronic component, and an enlarged view of the main part;

15 is a side view and a perspective view showing an example of still another coil type electronic component;

Fig. 16 is a sectional view showing an example of still another coil type electronic component.

17 is a cross-sectional view showing still another example of coil type electronic component.

18 is a cross-sectional view illustrating an example of a bonding method between a coil, a leader line, and an electrode.

19 is a cross-sectional view illustrating an example of a bonding method between a leader line and an electrode of a coil of another example.

20 is a sectional view and a perspective view showing a modification of the joining method of a leader line and an electrode of a coil;

Fig. 21 is a sectional view showing a perspective view and a conductor joining method of still another core;

Fig. 22 is a perspective view and a sectional view showing an example of a method of joining a lead line of another coil to an electrode;

Fig. 23 is a perspective view illustrating an example of a method of joining a lead line of another coil to an electrode.

24 is a cross-sectional view, a cross-sectional view, and a side view showing another example of the packaging material.

25 is a side view, a sectional view, and a sectional view illustrating another example of the packaging material and an example of a mounted state.

Fig. 26 is a perspective view illustrating still another example of the core, and a perspective view of an essential part showing an example of the coil type electronic component.

Fig. 27 is a sectional view showing the main manufacturing process of the coil-type electronic component in the background art.

There may be many forms of this invention, but an appropriate number of forms and examples are shown and described in detail here.

1A and 1B show an example of a tip inductor. In the figure, the magnetic core 10 is composed of a core portion 1a having a circular cross section, and one side provided at both ends thereof, for example, 0.08 mm square blades 1b and 1b, for example, ferrite furnace. On the outer and main surfaces of the blades 1b and 1b on which the V-shaped grooves 2 each having a depth of 0.06 mm, for example, are formed on each surface, silver, silver-platinum, Or copper and conductive films 3 and 3 for external electrodes made of nickel, lead-tin, and the like deposited thereon.

The coil 4 is wound around the core portion 1a of the magnetic core 1 with a diameter of, for example, 20 to 120 µm, and a coating material wound around an insulation coating wire such as polyurethane or polyamideimide. . The single coils 5 and 5 of the coil 4 are infiltrated into the V-shaped grooves 2 and 2 of the blade 1b, and then welded, thermocompressed, or ultrasonically vibrated to the conductive films 3 and 3 for external electrodes. Are joined together. Among them, in the thermocompression method, the end face 5 is deformed and flattened by pressing the heated head to the terminal 5 of the insulated coated wire, and then bonded to the conductive film 3. In addition, in the ultrasonic vibration method, the insulation coating of the terminal 50 is removed by the vibration of the head, and the cleaned copper wire and the conductive film 3 are joined by pressing with the heating head.

Since the cross section of the core portion 1a is formed in a substantially circular shape, it is possible to wind the insulation coated wire in close contact with the surface of the core portion 1a, and has less uneven inductance value than the case where the cross section of the core portion is angled. There is no risk of damaging the insulation coating of the wire. The packaging material 6 is made of an insulating material such as epoxy synthetic resin (you may put a pillar) deposited on the entire outer circumferential surface of the coil 4 by, for example, painting potting. The surface of the exterior material 6 has an inner side from the main surfaces of the blades 1b and 1b, and a portion corresponding to the corner portions of the blades 1b and 1b is outside the inner surface of the callan 1b and 1b. It is flattened to protrude toward. That is, as shown in FIG. 1 (B), the exterior member 6 is formed in a columnar shape along the shapes of the blades 1b and 1b so that the surface is located inside the blades 1b and 1b.

This inductor uses a magnetic winding 1, but in the case of a high frequency inductor, a winding made of an insulator such as armina may be used. In addition, the exterior member 6 is not covered with the entire outer circumferential surface of the coil 4, but as shown in Figs. You may coat | cover with the same width or changing width.

The tip-shaped inductor is easily disposed on the printed board by adsorbing the suction nozzle of the automounter onto the flattened surface 6a of the packaging material 6 and adsorbing it. Then, the external electrode conductive films 3 and 3 formed on the blade 1b are mounted on the printed board by soldering the conductive parts of the printed board. Such a tip inductor need not be particularly concerned about the mounting surface when the tip inductor is disposed on the printed board. Moreover, since the blade 1b of the core 1 is formed in an angular form, it does not roll like the circular blade.

The external electrode conductive films 3 and 3 are formed by changing the depths of the immersion of the blades 1b and 1b of the core 1 as shown in Fig. 2A. It may be deposited on a part of the main surface of the width, or may be deposited to the inner surfaces of the blades 1b and 1b as shown in Fig. 2B.

Moreover, although the grooves 2 and 2 which insert the terminal 5 of the coil 4 are formed in the blades 1b and 1b of the said core 1, these grooves 2 and 2 do not need to be formed. . In addition, the terminal 5 of the coil 4 is inclined with respect to the thickness direction of the blade 1b, as shown to FIG. 2 (C), (D), or along the outer surface of the blades 1b and 1b. In the bent state, you may connect to the electroconductive films 3 and 3 for external electrodes. Also in these cases, as shown in FIG. 1, the terminals 5 and 5 of the coil 4 are welded, thermocompressed, or ultrasonically vibrated to the conductive films 3 and 3 for the external electrodes of the blade 1b. It flatly deform | transforms by and joins.

3 shows an example of another tip-shaped inductor. In this inductor, the exterior member 6 is deposited on the outer circumferential surface of the coil 4 corresponding to one side of the main surface of the sharp edged blades 1b and 1b. The surface 6a of this exterior packaging material 6 is further planarized inside from the main surfaces of the blades 1b and 1b. The other structure is not different from that shown in FIG. The exterior member 6 can be similarly deposited on the outer circumferential surface of the coil 4 corresponding to the other side or two sides of the main surfaces of the angled blades 1b and 1b0.

The grooves 2 formed in the blade 1b are formed on each side of the blades 1b and 1b in the inductor shown in FIG. 1, but can be set to appropriate numbers as necessary. When the groove 1 is formed on all four sides of the blade 1b, the terminals 5 and 5 of the coil 4 are inserted into and joined to any of the four grooves 2 in order to obtain a desired inductance value. Can be.

4A and 4B show still another example of the tip inductor. The magnetic or insulating core 11 of these inductors is formed in a substantially circular cross section, and the coil 4 wound around the insulation coating wire is wound thereon, and the core (the core 5 is pressed against the terminal 5 of the coil 4). 11, the conductive caps 7 for external electrodes of angular form are fitted and fixed to both ends of 11). On the outer circumferential surface of the coil 4, an exterior member 6 made of, for example, a synthetic resin is coated. As with the embodiment of Fig. 1, this exterior member 6 also has a rectangular pillar shape along the conductive caps 7 and 7 for external electrodes, so that the flattened surface 6a is inward of the conductive caps 7 and 7. , Is formed.

4C and 4D are modified examples of FIGS. 4A and 4B. These inductors have the amount of coils 4 wound around and mounted on the core 11 after the angular shape of the conductive cap 7 for external electrodes is fitted to both ends of the magnetic or insulating core 11 formed in a circular cross section. The terminals 5 and 50 are connected to the outer circumferential surfaces of the caps 7 and 7 by the above-described joining, and other configurations are as shown in Figs. 4A and 4B.

In the inductor shown in FIG. 4, the exterior member 6 may be deposited over the entire circumference on the outer circumferential surface of the intermediate portion excluding both ends in the axial direction of the coil 4 as shown in FIGS. 1C and 1D. Alternatively, as illustrated in FIG. 3, the film may be deposited on the outer circumferential surface of the coil 4 corresponding to at least one side of the main surface of the angular shape conductive cap 7 for the external electrode.

In addition, in the above example, the surface of the exterior member 6 may be flattened so as to prevent adsorption by the suction nozzle of the automatic attaching machine. In other words, the cross-sectional shape is not concentric with the core portion 1a, and in the axial direction of the core portion 1a. In addition, although the exterior material 6 was formed in the inner surface by the main surface of the blade 1b or the said conductive cap 7, all the exterior materials 6 may be made into the same surface of those main surfaces, and may be outward from those main surfaces in actual peelability on mounting. You may also Further, as the packaging material 6, a mixture of magnetic powders such as ferrite powder and ferric oxide powder, for example, with epoxy resin or the like may be used. By using such a material, the inductance can be improved, the number of windings can be reduced by that increase, and a magnetic protective effect is also generated. Moreover, in the said Example, although the blade 1b of the core 1 was made into the square pillar shape which made the outer corner | angular part of the outer side curved surface, if it is an angular form, you may have a polygonal pillar shape. The curved surface processing of each part is also arbitrary.

In FIG. 5, the manufacturing method of the winding core which concerns on another Example is shown. In the same figure, (D) is the cross section which it looked at the arrow direction along the # 1- # 1 line | wire of (A). As shown in these figures, in the cross section of the rectangular column core body 10, the recessed part 12 for providing a central part in the center is formed, respectively. The circumference as shown in the drawing (C) by removing the center portion by rotating the recess 12 in the center so that the core body 10 is indicated by the arrow F1 in the drawing (B). The core 18 provided with the square-shaped blade part 16 in the edge part of the core part 14 of a shape can be obtained. If necessary, as shown in the drawing (D), the R processing may be performed on the top portion.

In addition, by forming the bent portion 20 in the core portion 14 and the blade portion 16, the joint strength between the core portion 14 and the callan portion 16 can be improved. In addition, although the recessed part 12 is still intact, it does not interfere, but it cuts out at the position shown by the arrow F2 in the same drawing (C), and also performs R processing to the top part, and has the shape shown in the drawing (D). You may also

Next, in the core body 22 for core shown in FIG. 6 (A), the convex part 24 is formed in the edge part, and this is made into the center of rotation, and as shown to the same figure B, the core part 26 and a blade are shown next. 28 is processed. Also in this example, as shown to the same figure (C), you may cut | disconnect the convex part 24 as needed. Next, the example shown to the same drawing (D) bonds the lead wire 32 to the edge part of the core body 30 for cores. And the core part 34 and the blade part 36 are machined as it rotates centering around these lead wires 32, as shown to the same figure (E). The lead wire 32 may of course be used as it is, and you may cut | disconnect like the recessed part 12 and the convex part 24 of the said example.

Next, in the example shown in FIG. 7 (A), grooves 42 are formed in each side surface of the rectangular core core body 40. And the core 42 for winding cores is supported by fixing these groove | channels 42 with the chuck as shown by the arrow F3 of the same drawing B, and a core part and a blade part are processed like the above-mentioned example. In the example shown in the same figure (C), the V-shaped groove 6 is formed in each side surface and end surface of the square pillar core body 44, and intersects in the cross section center. At this intersection point 48, the core body 44 for the core is supported by fixing with a chuck in the drawing D as shown by the arrow F4, and the core portion and the blade portion are processed as in the above-described example. In addition, the same drawing (D) is a state after a process.

As mentioned above, according to the example of FIGS. 5-7, since the center part processed is performed satisfactorily, high processing precision can be obtained. Therefore, workability | operativity, such as electrode formation and coil winding after this, is also improved. In addition, when forming a blade part only in the one end of a core part, you may provide one recessed part for center part in a blade part, and the other in a core part.

Next, the example of FIG. 8 relates to the formation method of the electrode corresponding to a blade part. For example, as shown in the same figure (C), since the immersion depth of the blade part 500 with respect to the paste 52 which mainly has the blade part 50 as silver etc. changes, the electrode is good to a degree. Can be formed.

So, in this example, the electrode 56 is previously formed in the edge part of the core body 54 by a immersion method, such as a immersion method. You may form a conductor film in the whole body. And the core body 54 for windings is processed like the said example, and the core part 58 and the blade part 60 are formed, respectively. At this time, as shown to the same figure (B), the process which removes a part of electrode 56 is performed, and the electrode 56 can be formed to a good grade. According to this method, L (inductance value) and Q (goodness) can also be adjusted to a good degree.

If the viscosity or viscosity of the paste 52 is low, the electrode 56 is formed relatively flat along the blade surface as shown in FIG. On the other hand, if the viscosity of the paste 52 is high, the electrode 56 is formed to swell as shown in the drawing (D), and the electrode film becomes thick in each part or the top part, which is a good state. For this reason, it is preferable to use a thing with high viscosity as a paste. Alternatively, the paste may be applied twice using a paste having a low viscosity and a high paste. For example, it is a case where the below is apply | coated with the paste with a low initial viscosity, and the following is apply | coated with a paste with a high viscosity.

Next, when ceramic is used as the material of the core, there is a property of hardening after firing. So, in the example of FIG. 9, processing is performed before baking. First, as shown to the same figure (A), the rectangular core core body 62 is prepared by the cera film before baking. Moreover, the groove | channel 64 is formed in the side surface of the core body 62 for winding as shown to the cross section in the same figure (B). Next, in the state which is easy to process before this baking, as shown to the same figure (C), the core part 66 and the blade part 68 are processed. In addition, you may make center process the same as the Example mentioned above for this process. After this processing, firing of the core body 62 for winding is performed.

In Fig. 10, another embodiment is shown. In this example, as shown in the figure (A), the cap 84 with the lead wire 82 is covered on both ends of the core 80. As for the core 80, the blade part 85 is formed in the both ends of the core part 86, and the electrode part 81 is formed in the blade part 85. As shown in FIG. In addition, instead of the core 80, the cap 84 may be bonded to the above-mentioned pillar-shaped core body, and the blade part and the core part may be processed centering on the lead wire 82. As shown in FIG. The cap 84 has a shape as shown in FIG. 11 (A), for example, and has a concave portion 89A into which the blade portion 85 of the core 80 is fitted. A slit-shaped window 83 is formed corresponding to the coil leader line connecting portion of 85.

Next, in this state, as shown in the drawing (C), the coil 90 is wound so as to reach the core portion 86 from the lead wire 82 to the blade portion 85. Thereafter, as shown in the drawing (D), the leader line portion is joined to the electrode 81 by the solder 91 via the window 83 of the cap 84 in the coil 90. Moreover, the exterior 92, such as resin, is given with respect to the coil 90 wound by the core part 86. As shown in FIG. Next, when the cap 84 is dropped from the core 80 by an appropriate method such as pulling the cap 84 while suppressing the soldering point of the coil lead wire, the lead wire is cut off, as shown in FIG. do. Thereafter, plating is performed on the electrode 810 and the soldering points by Ni or the like (omitted in the drawing).

11B, another example of the cap 84 is shown. The cap 84 shown to the same figure (A) is an example of the case where the core body 80 is a square pillar shape, and is provided with the recessed part 89A of the square pillar shape corresponding to it. The cap 84A shown in the same drawing (B) is an example of the case where the core body 80 is columnar, and has a columnar recessed portion 89B and a window 83A corresponding thereto. The cap 84B shown in the same drawing (C) is also an example of the case where the core body 80 is columnar, and has a cylindrical recessed portion 89C and a window 83b corresponding thereto. According to this embodiment, by combining a body having various shapes and a cap with a lead wire, a coil-type electronic component can be manufactured using a manufacturing facility for a component with a lead wire as it is.

Next, the example shown in FIG. 12 is an example similarly using a cap. As described above, from the point of mounting on the substrate, it is preferable that the blade has a flat surface, and from the point of mass mounting, it is preferable that there is no directivity. One blade shape that satisfies these conditions is a rectangular shape. However, the columnar shape is preferable at the point of ease of processing. Therefore, in the present embodiment, as shown in the drawing (A), such a demand is satisfied by joining a rectangular blade cap to the end of the circumferential core.

In detail, the slightly thicker end part 102 and the center core part 104 are formed in the circumferential core 100. These processes are performed centering on the recessed part 106 formed in the cross section. On the other hand, the blade cap 108 is provided with a columnar concave portion 110 corresponding to the end portion 102, in which the end portion 102 of the circumferential core 100 is press-fit or adhered with an adhesive body. do. The longitudinal cross section after joining becomes as shown to the same figure (B). In this way, the core part is obtained in the circumferential shape, and the blade part is the core of the square pillar shape. In addition, a groove may be formed in the side of the blade cap 108 in advance.

13, the modification of the above embodiment is shown. First, the example of the same figure (A) attaches the blade cap 124 which has the recessed part 122 to the edge part of the columnar core member 12 with the adhesive body 126. As shown in FIG. As the blade cap 1240, for example, a cross section having a rectangular cross section as shown in the drawing (B) is used. As shown in the drawing (C), the groove 126 is formed on the side surface of the blade cap 124. The example shown in the same drawing (D) is an example which attached the blade cap 134 which has the through-hole 132 with the adhesive agent 136 to the edge part of the cylindrical core member 130. In this case, it is as shown in the same figure (E).

12 and 13, a groove may be formed in a cap as needed. The cap may be formed of ceramic to form an electrode on the surface thereof, or the entire cap may be formed of metal. In this case, the whole blade part acts as a heat radiator, and a heat radiating effect can be expected. Moreover, you may use various things, such as insulating resin, an electroconductive adhesive material, and lead as an adhesive agent.

Next, the embodiment of Fig. 14A will be described. This embodiment relates to a coil. The coil 142 is wound around the core 14, and a coating material 144 is applied thereon as an exterior. In this example, the paint 144 is press-fitted to the coil 142 side as indicated by arrow F5. Then, as shown enlarged in the same drawing (B), the position of the coil 154 is prevented by the rough surface.

Next, in FIG. 15, the Example regarding the connection position of the coil lead wire with respect to an electrode part (equivalent to a blade part and an electrode) is shown. First, in the example shown in the same figure (A), the grooves 204 and 206 in the electrode portions 200 and 202 are arranged out of the longitudinal direction of the core. Leading lines 210 and 212 of the coil 208 are joined to the electrodes in the grooves 204 and 206, respectively. By making such a groove arrangement, the effect that the stress by shrinkage of an exterior resin is alleviated is acquired. In the example shown in FIG. 2B, grooves 222, 224, 226, and 228 are formed in the electrode part 220, and grooves 232, 234, 236, and 238 are formed in the electrode part 202. Depending on which groove the coil lead wires 210 and 212 are joined to, the number of windings of the coil 208 changes, and furthermore, L and Q can be easily adjusted to improve productivity. The example shown in (c) is an example in which the groove 242 formed in the electrode portion 240 and the groove 246 formed in the blade portion 244 are formed on the other surface of the square pillar. Also in this example, the number of windings of the coil is changed so that L and Q can be adjusted. In addition, by combining (B) and (C), L and Q can be adjusted to a greater extent.

Next, another example will be described with reference to FIG. This example is made to apply | coat twice the coating material or resin apply | coated on a coil. First, as shown in the longitudinal section in (A) and the cross section in (B), the coating material 314 is applied in a circumferential shape on the coil 312 wound around the core 310 (the electrode is not shown). Next, the coating material 316 is applied on the coating material 314 in the shape of a square column, as shown in the vertical section in (C) and the cross section in (D). By applying the lower coating 314 with a low viscosity, coating is applied between the coils 312 which are wire rods, and the fixation of a wire rod and the insulation between wire rods can be aimed at. In addition, by performing the upper coating 316 with a high viscosity, the thickness of the coating material can be maintained and shaping can be performed satisfactorily. As needed, you may divide and apply again several times.

Next, the example of FIG. 17 is demonstrated. In addition, although the lead line of the coil 352 wound around the core part 350 is joined to the electrode 356 of the blade part 354 in FIG. 360) is present. If there is such a gap 360, it causes a defect such as disconnection. Therefore, in this example, the protective exterior 362 is again provided on the exterior 358 of the coil 352. In the core cross section, the conductive resin 364 is formed by a immersion method, a transfer method, or the like so as to contact the electrode 356, and a plating 366 is formed thereon. By protecting the gap 360 with the protective exterior 362, disconnection or the like can be prevented. In addition, although the exterior 358 and the protective exterior 362 on the coil 352 may be formed separately, you may form simultaneously, as shown to the same figure (B). In addition, the protective sheath may be formed in a band shape in the gap portion. 17C is an example in which the gap 360 is protected by the conductive resin 363.

Next, with reference to FIG. 18, it demonstrates according to another embodiment. The wire used as a coil has the structure which coat | covered the conductor 410 with the insulator 412 as shown to FIG. 18 (A). Therefore, when connecting the coil leader line to the electrode, the cover 412 is removed by any method.

At this time, in the present embodiment, as shown in the drawing (B), the surface of the conductor 410 is roughened to form an uneven surface (rough surface) 414. The unevenness 414 can be easily formed by mechanically rubbing the surface of the conductor 410 when the coating 412 is peeled off, for example. The conductor 410 on which the unevenness 414 is formed is placed on the electrode 418 formed on the blade portion 416, as shown in the longitudinal direction cross section in FIG. The 410 is bonded to the electrode 418 by a method such as thermocompression, welding, or ultrasonic compression. The bonding state of the conductor 410 and the electrode 418 is different from that of the conductor 410 with respect to the electrode 418 depending on the unevenness 414 due to the so-called anchor effect as shown in the figures (E) and (F). Good adhesion and strength of bonding are improved.

Modifications are shown in the drawings (G) to (K). In this example, the groove 420 having a U-shaped cross section is formed in the blade portion 416 (refer to the figures (G) and (H)). The conductor 410 is an electrode 418 in the groove 420. ), But the unevenness 414 of the conductor 410 and the electrode 418 are connected at this time, so that the strength of the coupling between the two is improved as in the above embodiment (Figs. I and J). )Reference). In addition, the conductor 410 may be collected in the groove 420 as shown in FIG. This is in a good state in terms of mounting.

According to these embodiments, since the groove 420 is formed, the joining area of the conductor 410 and the electrode 418 increases, thereby increasing the joining strength. Moreover, the conductor 410 is collected in the groove 420 so that the protrusion from the electrode 418 is reduced. For this reason, the adhesiveness with the electrode pattern of a board | substrate (not shown) improves, and there exists an advantage that attachment is safe.

Next, another Example is described, referring FIG. The same figure (a) shows the principal part of the cross section seen from the longitudinal cross section of a coil bobbin in the direction of an arrow along this 2 '-# 2 line, respectively (B) and (C). On the blade portion 432 of the core 430, electrodes 434 are formed on the side and end surfaces thereof, respectively.

By the way, the conductive paste which forms the electrode 434, for example, silver paste, contains the glass slit as a binder. In addition, in the case of a conductive adhesive (or conductive resin), an organic component (for example, epoxy resin, phenol resin, acrylic resin) is contained as a binder. Thus, in the present embodiment, as shown by the arrow F6 in the same drawing (B), the glass slit concentration is higher at the blade portion 432 side, and the glass slit concentration is lower at the surface side, so that the electrode 434 is lowered. Is formed. In other words, the concentration of the glass slit 434A on the blade side is high, on the contrary, the concentration of the silver 434B is increased on the surface side, and the unevenness on the surface side becomes large. Such concentration drops can be formed by adjusting the ignition temperature or by forming a wet property with the blade body. With respect to such an electrode 434, as shown in the drawing (C), the leader wire conductor 436 of the coil is joined by thermocompression bonding or the like.

In general, silver paste tends to increase in bonding strength as the glass slit concentration increases. Therefore, the core material which forms the blade part 432, and the silver paste which forms the electrode 434 come into contact with a large intensity | strength by high glass slit density | concentration. On the other hand, the joint between the silver paste and the coil lead wire conductor 436 has an anchor effect similar to the above-described embodiment because the unevenness due to the silver ribs 34B exists as shown in the figures (B) and (C). It becomes powerful by.

As mentioned above, according to the present Example, both the adhesiveness of an electrode and a blade part, and the adhesiveness of an electrode and a coil lead wire conductor are both improved, and favorable reliability can be obtained. Also in this embodiment, a groove may be formed in the blade portion 432 to strengthen the bonding force.

The electrode may be formed of a plurality of layers. For example, as shown in Fig. 20A, the silver electrode 431 is formed on the blade portion 4320, and Sn-Pb plating 433 is further applied to the lead portion 436. ) Can be obtained by the ultrasonic wave and the heating by the melt bonding (including alloy bonding), and the same effect as in the example of Fig. 19. As the method of joining, the mechanical bonding shown in Fig. 19 and the melt shown in Fig. 20A are shown. In addition to the bonding, there are diffusion bonding in which the conductor and the underlying material are diffused and bonded, of course, two or more of these mechanical bonding, melt bonding, and diffusion bonding may be combined.

Furthermore, as shown in the same figure (B), the unit value 434P of the electrode 434 on the side of the blade portion 432 is changed as indicated by the arrow F7, and as a result, the electrode 434 and Coupling strength with the leader line 436 can be adjusted. Moreover, in this example, the groove 438 is widely formed, and the leader line 436 can be joined to the electrode 434 in the direction inclined with respect to the longitudinal direction of the core (the arrow F7 direction in the drawing). . As a result, the bending angle of the leader line 436 is alleviated, and disconnection is prevented.

Next, another Example is described, referring FIG. The winding core is shown by the same figure (A), and the square-blade blade part 442 is each formed in the edge part of the core part 440 of the center columnar shape. In the blade portion 442, a reverse tapered groove 444 is formed at approximately the center of each side surface. The same figure B shows the cross section of the groove | channel 444 seen from the arrow F8 direction, and the electrode 448 is formed in the surface of the blade part 442. As shown in FIG. The coil leader wire conductor 446 is inserted into the groove 444 and pressed onto the electrode 448.

In the present embodiment, however, the groove 444 has an inverted tape shape as described above. For this reason, the coil lead wire conductor 446 after crimping | bonding becomes lodged in the groove | channel 444 as shown to the same figure (C). The bonding strength between the electrode and the coil lead wire conductor is deteriorated by the conditions at the time of bonding, and in some cases, the lead wire conductor may peel off. According to the present embodiment, however, even when the conditions at the time of joining become slightly worse, the lead wire conductors to the reverse tapered grooves 444 are held together, whereby the bonded state is maintained, thereby preventing the lead wires from peeling off.

Next, another Example is described, referring FIG. The same figure (A) shows the external appearance of an Example, and the cross section seen in the arrow direction along the 3 '-3' line is shown to (B). In addition, the junction part of a coil lead wire conductor and an electrode is expanded and shown in (C).

The coil 452 is wound around the core part 450 of the core. And through-hole 456 is provided in the blade part 454 of the core end surface from the inside of the core to the outer side, and the electrode 458 is formed in the side surface and the cross section. The leader wire conductor 460 of the coil 452 is inserted into the through hole 456 of the blade portion 454, respectively. The tip of the coil leader wire conductor 460 is joined to the electrode 458 by, for example, a conductive paste.

Thus, according to this embodiment, the coil leader wire conductor 460 is inserted into the blade portion 454 and is not installed on the side of the blade portion 454. Therefore, the action of the external force on the coil leader wire conductor 460 is reduced, so that the coupling with the electrode 458 is maintained well. In addition, since the side surface of the blade portion 454 is kept flat, the bonding with the substrate-side conductor pattern (not shown) is also good. In addition, the closer the through hole 456 is to the core portion 450, the less the influence of the external force on the coil lead wire conductor 460, thereby preventing disconnection of the coil lead wire conductor 460.

Next, another Example is described, referring FIG. First, referring to the embodiment shown in the same drawing (A), the U-shaped grooves 472 are formed on the side surfaces of the blade portion 470, and the electrodes (side) and the end surfaces of the blade portion 470 are formed. 474 is formed. In the present embodiment, unevenness 476 is formed on the surface of the electrode 474. The unevenness 476 can be formed by, for example, sandblasting or selective etching. The coil lead wire conductor (not shown) is press-bonded to the electrode 474 in the groove 472, but at this time, the unevenness 476 of the electrode 474 is connected, so that the strength of the coupling between the two is improved. . In addition, by combining this embodiment with the embodiment of Fig. 18, if the unevenness is formed on both of the leader line conductor side and the electrode side, the bonding strength of both can be further improved.

In addition, as described above, since the groove 472 is formed, the bonding area between the leader wire conductor and the electrode 474 increases, whereby the bonding strength also increases. Moreover, the leader wire conductor is allowed to collect in the groove 472 so that the protrusion from the electrode 474 is reduced. For this reason, the adhesiveness with the electrode pattern of a board | substrate (not shown) improves, and attachment is also stable.

Next, the Example shown to the same figure (B) is demonstrated. Grooves 482 are formed in the blade portion 480, and electrodes 484 are formed on the side surfaces and the end surfaces thereof. In this embodiment, the tip of the coil leader wire conductor 486 is joined to the electrode 484 at a position inside the cross section 480A of the blade portion 480. When the tip of the coil lead wire conductor 486 reaches the cross section 480A of the blade portion 480, the tip portion is rubbed during plating or bulk mounting, so that the coil lead wire 486 may peel off from the electrode 484. According to this embodiment, such peeling is prevented favorably.

Next, the Example of the same drawing (C) is demonstrated. Grooves 492 are formed in the blade portion 490, and electrodes 494 are formed on the side surfaces and the end surfaces thereof. In this embodiment, the tip of the coil lead wire conductor 496 protrudes more than the groove 492, and the tip is wound around the end face along the R-shape of the blade portion 490 and joined to the electrode 494. It is. Since the tip of the coil lead wire conductor 496 is wound up to the blade section end face, the junction area with the electrode 494 increases, and the bond strength of both improves. Therefore, peeling of the tip part of the coil lead wire conductor 496 at the time of plating or mounting is prevented favorably.

Next, with reference to FIG. 24, the Example which improved the flatness of an exterior part is demonstrated. The same figure (A) shows the cross section immediately after applying the exterior in the present Example. In the figure, the core 510 has a structure in which rectangular blade portions 514 are provided at ends of the central core portion 512, respectively. Coil leader wire connection electrode 516 is formed in each side surface and end surface of the blade part 514. The coil 518 is wound around the core part 512, and the lead wires 520 at both ends thereof are joined to the electrode 516 by a method such as thermocompression bonding. Furthermore, plating 522 by Ni or the like is applied to the surface of the electrode 516.

In the present embodiment, however, the exterior coat 524 is applied on the coil 512 by paint or resin. The exterior 524 is made sufficiently large so as to emerge outward from the plating 522, as shown in FIG. In this state, in the present embodiment, the outer coat 524 is processed by polishing or the like, and the portion protruding to the plating 522 is removed and flattened. Thereby, the planarity of each side surface of a square pillar shape improves, adsorption can be performed favorably, and stability on a board | substrate also improves. Further, when the exterior coat 524 is polished deeper than the side surface of the blade portion 514, the distance from the substrate can be formed to a good degree. The method of improving planarity is not only limited to the grinding | polishing shown here, For example, the method by injection resin molding using a metal mold | die may be sufficient.

The state at the time of mounting is shown by FIG. 24C, and the space | column 526 is formed in the exterior coat 524. As shown to FIG. And the coil type electronic component is mounted so that the other components 530 on the board | substrate 528 may be in the space | interval 526. As shown in FIG. In this example, the gap 526 is formed with the blade side of the exterior coat 524 remaining somewhat. This is to prevent trouble from being caused by the polishing process of the outer coat at the junction between the leader line 520 of the coil 518 and the electrode 516.

Next, the example of FIG. 25 (A), (B) is an Example regarding the ratio of the flat part of an exterior coat. As described above, the exterior coat is preferably flat from the viewpoint of adsorptivity and stability, but it is not always necessary that the exterior coat is flat. That is, the coil 541 is wound around the core part 539 as shown in the arrow direction along the ＃ 4- ＃ 4 line of (A) to (A) plane, (B), and the electrode of both ends, The part 540 has a rectangular pillar shape. However, in the center exterior coat 542, the ratio of the width WP of the flat surface 544 in each side surface is 30% with respect to the width WT of the whole side surface. However, it has been found that this degree of flattening can be satisfactorily carried out and the stability on the substrate can be maintained. In addition, even if it is a flat surface, it is not necessary to be a perfect plane and there may be some curvature.

The embodiment shown in the same figure (C) is an example which made the surface (uneven | corrugated) which roughened the surface of the exterior coat 554 formed on the coil 552 between the blade parts 550. As shown in FIG. As a method of obtaining such a rough surface, (1) Use a highly viscous paint as a coating material for the exterior coating so that the unevenness of the coil 552 is slightly raised. (2) To mix a pillar of a predetermined thickness with the exterior coating. This increases the surface roughness of the exterior coat. Thus, by forming minute unevenness on the surface of the exterior coat 554, the generation of static electricity due to the friction of the components with each other during the bulk supply is reduced. In addition, the positional deviation of components generated when the suction nozzle is turned during mounting is also reduced.

Next, the Example shown to FIG. 25D is an example regarding the electrically conductive paste on a board | substrate, for example, soldering. As shown in the figure, according to this example, grooves 562 are formed in each side surface of the electrode portion 560, respectively. The lead wire (not shown) of the coil is joined to any one of 562. When the component is placed on the substrate 564, it is exactly as shown in Fig. 25D. When the solder 566 is attached in this state, the solder 566 is attracted to the grooves 562, so that even a small amount of solder can form a good fillet and a large bonding strength can be obtained. For this reason, it is suitable for downsizing and weight reduction. As in the related art, when solder is attached to the entire electrode 560, problems such as the division of parts due to the influence of the solder occur, but such problems are also improved in this embodiment.

Next, the Example shown to FIG. 26 (A) is an example in which the height of a component became low, and the cross-sectional shape of the blade part 570 of the core is set to rectangle. And the core part 572 between these blade parts 570 is elliptical shape, as shown in the figure (B) as shown in the arrow direction along the # 5- # 5 line. Moreover, the coil lead wire connection groove | channel 574 is formed in the side surface of the blade part 570, respectively. The side surface of the long side of the blade portion 570 is arranged in contact with the substrate surface, and the height of the component can be reduced. Moreover, since the side surface of the short side of the blade part 570 is arrange | positioned in contact with a board | substrate surface, the whole oil area of a component can be reduced. According to this example, the same component can be divided and used according to the use of a low height and a small mounting area. Moreover, the core area is ensured by making an ellipse the cross section of a core part.

The embodiment shown in the same drawing (C) is an example in which the fuse 588 is formed at the junction between the electrode 582 of the blade portion 580 and the lead line 586 of the coil 584. In this example, the electrode 582 is formed of a thick film so that the function of the fuse 588 is sufficiently achieved. The fuse 588 is designed to be cut off by a predetermined current or more, so that the circuit can be protected. In addition, there is no need to install fuses separately, which contributes to miniaturization and light weight. Further, other circuit elements other than fuses, for example, resistors and capacitors may be formed. In the blade portion 580, if a recess such as a groove is formed and a circuit element is formed in the recess, it is practically suitable.

In the above embodiment, the core is formed by firing ferrite or armina, for example. The electrode formed on the surface of the blade portion at the end includes a thin film layer having a thickness of 1 to 60 µm or a thick layer mainly composed of Ag, Ag-Pb, Ag-Pi, Cu, or the like, and Ni, Sn, Sn-Pb or the like formed thereon. Formed by a plating layer having a thickness of 1 to 10 µm. Moreover, when an example of a dimension is shown, the length of a core is about 1.6 mm, and the width and height are about 0.08 mm. The diameter of the core part in the center of the core is 0.2-0.7 mm, and the width | variety of the blade part 16 is 0.02-0.5 mm.

As described above, according to the embodiment, the following effects are obtained.

(1) Since an exterior member having a flattened surface is formed on the coil, when the printer is mounted on the printed board as an automatic mounting machine, the suction nozzle can be easily or reliably adsorbed to transfer the parts.

(2) Since the whole part is in the shape of a column, it is easy to mount without rolling on the printed board as in the case of the drum type core having a circular blade.

(3) Since the unevenness | corrugation which shows the center is formed in the core body for core winding, while high degree of processing can be performed, workability also improves.

(4) Since the electrode was removed to form the workpiece, the degree of formation was improved.

(5) Since the cap is attached to the end of the core body, it can cope well with various shapes.

(6) Since the paint is pushed in the coil, insulation improves.

(7) Since the core part of the core is roughened, the coil is prevented from being displaced.

(8) Since the bent portion is formed at the joint portion of the blade portion and the core portion, the strength is improved.

(9) The number of work required for manufacturing is reduced, productivity is improved, and various coil type electronic components that can cope with various circuits can be efficiently produced.

(10) Since the lead wire was connected to the electrode at a position deviated from the winding length direction, L and Q can be adjusted.

(11) Since the protective sheath is to be formed, disconnection and the like are prevented and the quality and productivity are improved.

(12) Since the unevenness | corrugation was formed in the coil lead wire conductor or the at least one joining surface of an electrode, joining of both is strengthened. In addition, since the groove is provided in the blade portion of the core, the joining area of both is increased, the bonding force is further strengthened, and the blade side surface is flattened to be very suitable for mounting.

(13) When the electrode was formed of a conductive paste, the concentration was adjusted so that the binder was largely grown on the leader line conductor side at the blade side, so that the bonding strength was increased in all of the blade portion, the electrode, the electrode, and the coil leader wire conductor.

(14) Since the groove of the blade portion is in the reverse tapered shape, the coil lead wire conductor becomes lodged in the groove, the bonding strength is increased, the peeling of the conductor is prevented, and the blade side is flattened and can be mounted satisfactorily.

(15) Since the through hole of the blade portion is provided and the coil lead wire conductor is inserted therein, the peeling of the conductor is prevented, and the flat side surface of the blade portion is maintained as it is and is suitable for mounting.

(16) The tip of the coil lead wire conductor is set to a position slightly inside the groove of the blade portion, or the position of turning around the blade portion end face, whereby peeling of the conductor at the time of plating or mounting is prevented satisfactorily. .

(17) Since the external coat formed to be inflated from the electrode portion is removed to be processed into a predetermined shape, the planarization can be achieved with good planarity and the mountability can be improved. If necessary, the desired interval can be formed to a good degree.

(18) Since the surface of the exterior coat was made into a rough surface, the generation and displacement of static electricity was reduced, and the mountability was improved.

(19) Since grooves are formed on the side of the electrode portion, bonding strength with a high substrate can be obtained with a small amount of solder or conductive paste, and the mountability is improved.

(20) Since the blade section has a rectangular rectangular cross section, the height can be reduced and the mounting area can be reduced.

(21) Since a circuit element is formed between the coil lead wire and the electrode, the number of parts can be reduced, and hence the mountability can be improved.

There are many embodiments in this description, and various modifications can be made based on the above disclosure. For example, the following is also included.

(1) In the above embodiment, the core center has a cylindrical shape and the blade portion has a rectangular core, but it does not prevent the core center from having various core shapes such as a rectangular pillar shape. For example, it can act also on the vertical coil type electronic component which has a blade part only in one side of a core part. The same is true of grooves on the side of the blade. The groove of the blade portion joining the coil lead wire may be one place, but it is suitable for mounting on the side of the blade portion and for mounting and characteristic adjustment. You may select suitably the material used for each part as needed.

(2) The above embodiments may be combined.

(3) In the above embodiment, the present invention is mainly applied to an inductor, but can be applied to various coil type electronic components such as general mode choke coils, transformers, and beads arrays.

(4) Although the electrode was formed from silver paste or the like in the above embodiment, various methods such as plating, sputtering, and steam may be used. In addition to the silver paste, a paste such as Cu, Ni, Ni-Cr, or a conductive resin may be used.

Claims (25)

A core comprising a core and blades installed at both ends thereof; An external electrode formed on the blade; A coil wound around the core and having a lead wire connected to the external electrode; An exterior member formed on the coil and having a flattened surface; Coil-type electronic component comprising a. The coil type electronic component as set forth in claim 1, further comprising a groove for connecting the lead wire to the external electrode at a position deviated from a direction orthogonal to the longitudinal direction of the core on the side surface of the blade. . The coil type electronic component according to claim 1, wherein irregularities are formed on at least one joining surface of the leader line or the external electrode. The coil type according to claim 1, wherein the external electrode is formed on the blade by a conductive paste, and the bonding agent in the conductive paste is density-adjusted so as to be larger on the blade side and smaller on the leader line side. Electronic parts. The coil type electronic component according to claim 1, wherein the external electrode includes a layer having high adhesion to the blade and a layer having high adhesion to the leader line. The coil type electronic component according to claim 1, wherein a groove is formed in at least one side surface of the blade, and the lead wire of the coil is received in the groove and bonded to the external electrode. The coil type electronic component according to claim 6, wherein the groove is formed in an inverted taper shape. The coil type electronic component according to claim 1, wherein a through hole is formed in the blade, and the through hole is connected to the external electrode through a lead line of the coil. The coil type electronic component according to claim 1, wherein the lead wire and the external electrode are joined at a position where the tip of the lead wire becomes one of the inner surfaces of the blade. The coil type electronic component according to claim 1, wherein fine irregularities are formed on a surface of the packaging material. The coil type electronic component according to claim 1, wherein a cross section of the core in the longitudinal direction of the core is made oval and a cross section of the core in the longitudinal direction of the blade is formed in a rectangular shape. The coil type electronic component according to claim 1, wherein a circuit element is provided between the lead wire of the coil and the external electrode. Processing a core body for cores to obtain cores including a core and a blade; Forming an external electrode on the blade; Winding a coil around the core and connecting the lead wire to the external electrode; Installing a sheath having a planarized surface on the coil; Method of manufacturing a coil-type electronic component comprising a. 15. The method according to claim 13, further comprising a step of forming a concave portion or a convex portion for forming a central portion in a cross section of the core body, and rotating and processing the core body around the concave portion or the convex portion. Manufacturing method of coil type electronic component. The coil type electronic component according to claim 13, further comprising a step of forming a lead wire for extending a center portion at a cross section of the core body, and rotating and processing the core body around the lead wire. Manufacturing method. The method according to claim 13, further comprising a step of forming a supporting recess or a convex portion on a side surface of the core body, and supporting the core body for rotation by using the recess or the convex portion to rotate the workpiece. Method of manufacturing a coil-type electronic component. The method of manufacturing a coil-type electronic component according to claim 13, wherein an electrode is formed in the core body and a part of the core is removed during processing. The method of manufacturing a coil-type electronic component according to claim 13, wherein the cap is attached to the blade and the cap is detached after the coil is bonded to the external electrode. The method of manufacturing a coil-type electronic component according to claim 13, wherein a cap functioning as the blade or the external electrode is attached to a cross section of the core body. The method of manufacturing a coil-type electronic component according to claim 13, further comprising a step of forming a surface roughened by the surface of the core in the core body. The method of manufacturing a coil-type electronic component according to claim 13, further comprising the step of forming a curved portion at a junction between the core and the blade. The method of manufacturing a coil type electronic component according to claim 13, further comprising the step of forming the external electrode by a immersion method using a high viscosity liquid solution. The method of manufacturing a coil-type electronic product according to claim 13, wherein the resin is used as the packaging material and the resin is pressed between the coils. The method of manufacturing a coil type electronic component according to claim 13, further comprising a step of dividing the resin several times and applying the resin to the coil while using a resin as the packaging material. The method of claim 13, further comprising: applying a resin as the packaging material and projecting the resin to protrude outward from the surface of the external electrode; Removing the surface of the packaging material formed by this step and processing it into a desired shape; Method of manufacturing a coil-type electronic component comprising a.