JP3443509B2 - Wound electronic component and method of manufacturing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding type electronic component such as an inductor, a transformer and a choke coil, and a method for manufacturing the same, and more specifically, to an improvement in winding breakage.

[0002]

BACKGROUND ART Various kinds of wire-wound electronic parts have already been put into practical use.
Various improvements have also been made. For example, the actual Kaisho 51-1
In Japanese Patent No. 15547, a coil is wound around a core portion of a winding core (coil bobbin) having a collar portion at an end, and a conductive layer is formed on a peripheral surface of the collar portion, and an end portion of a lead wire of the coil is formed on the conductive layer. There is disclosed a fixed inductance element configured to be connected to and also to a conductive portion of a printed circuit board. Japanese Utility Model Application Laid-Open No. 56-110612 discloses an inductance element in which a groove is formed in a flange portion and a coil end is housed in the groove.

In Japanese Unexamined Patent Publication No. 57-73916, the end of a coil wound around the center of a core is connected to a conductor layer formed on the flange of the end of the core, and an electrode is formed on the rear end face of resin encapsulation. There is disclosed a small-sized inductor formed with. Further, Japanese Utility Model Laid-Open No. 61-144616 discloses a chip coil in which a lead wire is drawn out by providing a winding lead-out groove in a quadrangular flange portion and electrodes are also provided on side surfaces of the flange portion.

As described above, the wire-wound 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 collar portion. Joining of the coil lead wire to the collar portion is performed by a method such as thermocompression bonding. FIG. 10A shows a state at the time of joining. A coil 903 is wound around a core portion 902 of a winding core having a quadrangular flange portion 900 at its end. Further, electrodes 904 are formed on the end surface and side surfaces of the collar 900 by a conductive (silver) paste or the like by an appropriate method such as a dipping method. The lead wire 906 of the coil 903 is thermocompression-bonded to the electrode 902 of the flange 900, as indicated by an arrow FA. Specifically, as shown in FIG. 3B, the heated pressing member 907 having a slanting portion performs pressure bonding, and the leading end of the lead wire 906 is cut. The electrode portion is then plated.

Looking at the cross section of the crimping portion of the lead wire 906, the thickness shape greatly changes at the bending position as shown in FIG. That is, the crimping portion 908 is flatly crushed, and this is continuous with the columnar portion 910 having the original shape. Therefore, the external force is concentratedly applied between the joining portion of the lead wire 906 and the winding portion, and the bent portion has a property of being weakened.

Another winding core shape is shown in FIG. 1C, and a recess 912 for accommodating the lead wire 906 is formed on the side surface of the collar 900. Leader line 906
When it is accommodated in the concave portion 912, it is enlarged and shown in FIG. In such a configuration, the center of the leader line of the recess 912 and the center of the leader line on the core side form an angle of about 90 degrees, and the bending stress is large.
Of course, the same applies to the example of FIG.

On the other hand, in a plating process or the like, a large number of wire wound electronic components are usually put into a plating tank and rubbed against each other. In addition, recently, wire-wound electronic parts are also so-called bulk compatible, and a large number of wire-wound electronic parts are housed in a container and taken out by suction. Also in this case, the wire-wound electronic components rub against each other. Then, the bent portion of the lead wire 906 may be affected by the rubbing, and eventually the wire may be broken.

Next, a coated copper wire is generally used as the coil 903, but it is necessary to remove the coating at the joint with the electrode 904. As a method of stripping the coating, there are a mechanical (physical) stripping method and a chemical stripping method.
However, the mechanical peeling method is apt to scratch the copper wire, which increases the possibility of disconnection. Further, the chemical stripping method does not cause such an inconvenience, but has a disadvantage that the stripping margin is difficult to obtain with accuracy and the inductance value is also difficult to obtain with accuracy.

The present invention focuses on the above points,
It is an object of the present invention to provide a wire-wound electronic component and a method for manufacturing the same that can reduce the breakage of the coil lead wire and improve the reliability and productivity.

[0010]

To achieve the above object, in the wire wound electronic component of the present invention, the lead wire of the coil wound around the core portion of the winding core is joined to the electrode of the collar portion. In the wire-wound electronic component, a groove is formed on the side surface of the flange portion so as to gradually become deeper from the winding core end side toward the core side, and the lead wire and the electrode are joined by this groove.

According to another aspect of the invention, a buffer layer is formed so as to cover the corner portion, which reduces the occurrence of stress due to friction between the corner portion of the collar portion on the core side and the leader line. Alternatively, a step or groove that is oblique with respect to the longitudinal direction of the winding core is formed on the side surface of the flange portion, and the lead wire and the electrode are joined by the step or groove that is obliquely formed. Alternatively, a groove is formed on a side surface of the collar portion along a winding direction of the coil, and the lead wire and the electrode are joined by the groove. Alternatively, a step or groove for joining the lead wire and the electrode is formed substantially at the center of the side surface of the collar portion, and the lead wire is formed so that the lead wire is oblique with respect to the longitudinal direction of the winding core. It is characterized by being joined in the groove.

In still another aspect of the invention, the coil is covered with an outer coat, and the electrode and the remaining portion of the cover of the lead wire with the outer coat are electrically conductive at a joint portion between the lead wire and the electrode. It is characterized in that it is covered with a conductive resin layer.

According to the manufacturing method of the present invention, the lead wire is
It is characterized by including a step of pressure-bonding to the electrode in the state where the coating is attached, breaking and bonding the coating of the pressure-bonded portion, and a step of removing an unnecessary coating broken by the coating with a coating removing agent. .

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

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to Examples.

First Embodiment First, a first embodiment will be described with reference to FIG. In FIG. 1A, the winding core 1 according to the first embodiment.
The main part of 0 is shown. In the figure, the core 10
Is provided with a quadrangular prismatic or quadrangular end face rim 14 at the end of the core 12. It should be noted that only one flange 14 is shown in the figure. A groove 16 having a substantially V-shaped cross section is formed on each side surface of the collar portion 14.

FIG. 1B shows a cross section of the groove 16 as seen in the direction of the arrow along the line # 1- # 1 in FIG.
As shown in the figure, the groove 16 has a shape in which the depth gradually increases from the winding core end side toward the core side. An electrode 18 for connecting a coil lead wire is formed on the end surface and the side surface of the collar portion 14 having such a groove 16.

The core 10 having the flange portions 14 at both ends of the core portion 12 is formed, for example, by firing ferrite or alumina. The electrode 18 formed on the surface of the collar portion 14 is a thin film layer or thick film layer of 1 to 30 μm made of Ag, Ag-Pd, Ag-Pt, Cu, etc., and Ni, Sn, and It is formed of a plated layer of 1 to 10 μm made of Sn-Pb or the like. Further, as an example of the dimensions, the length of the winding core is about 1.6 mm, and the width and the height are 0.
It is about 8 mm. The diameter of the core portion at the center of the winding core is 0.2 to 0.
The width of the collar 16 is 0.2 to 0.5 mm.

Next, the operation of this embodiment will be described. FIG. 1 (C-1) shows a state in which a lead wire is pressure-bonded to the electrode 18 in the groove 16 described above. That is, the lead wire 20 is crimped according to the depth of the groove 16,
The thickness gradually increases from the core end side toward the core side.
When the groove 16 is viewed from the end face side of the flange portion 14, it becomes as shown in FIG. Further, when the groove 16 is viewed from the core side of the collar portion 14, it becomes as shown in FIG. As described above, according to the present embodiment, the thickness of the crimped lead wire 20 does not change suddenly, but gradually changes including the bent portion. Therefore, as compared with the background art shown in FIG. 10 (B), the occurrence of disconnection concentrated between the joining portion of the lead wire 20 and the winding portion can be reduced.

A modified example is shown in FIG.
In this example, the groove 22 is deeper on the core side as compared with the above-described example, and has a depth substantially equal to the diameter of the lead wire 20. Therefore, from the end face side of the collar portion 14, the groove 2
Looking at FIG. 2, although it is as shown in FIG. 2 (D-2) as in the above embodiment, looking at the groove 22 from the core side of the collar portion 14 is as shown in FIG. 2 (D-3). . That is, the bent portion on the core side has a thickness substantially equivalent to the diameter of the lead wire 20. Therefore, the change in the thickness shape of the lead wire 20 from the core end side to the core side becomes more gentle as compared with the above-mentioned embodiment, and the occurrence of wire breakage is further reduced.
In addition, in the above example, the groove 16 is configured to be gradually deeper, but it may be configured to be gradually deeper. The groove shape is also V
It may be an appropriate shape other than the letter shape.

FIG. 2 shows another modification. In the above-described embodiment, the lead wire 20 is joined to the electrode 18 by pressure bonding, but in this embodiment, the joining is performed by a conductive paste, that is, a conductive resin (conductive adhesive), a solder paste, or a conductive coupling means such as plating. Be seen. The same figure (A) is a cross section taken along the end face of the collar portion 14, and (B) is the section of
2 is a cross section viewed in the direction of the arrow along the line 2- # 2. In these drawings, a groove 1 having a substantially U-shaped cross section is formed on the side surface of the collar portion 14.
7 is provided, and the depth thereof is set to be sufficiently larger than the diameter of the lead wire 20. The electrode 18 has a groove 17
It is formed including. Leader wire 20 stored in the groove 17
Are bonded to the electrodes 18 by the conductive paste 19. With such a configuration, the thickness of the lead wire 20 does not change at all, and disconnection due to a sudden change in the thickness is favorably prevented.

[0021]

Second Embodiment Next, a second embodiment will be described with reference to FIG. The figures each show a longitudinal cross section of the winding core. First, the embodiment (A) has a configuration in which a rounded portion 32 is formed on the core side of the collar portion 30. The lead wire 20 is wound around the core portion 12 along the rounded portion 32 from the side surface of the collar portion 30. Therefore, the leader line 20 does not bend at an acute angle as shown in FIG. 10D, and bending stress is reduced. Further, the leader line does not come into contact with the sharp corner portion (top portion) of the brim portion, so that the occurrence of wire breakage and scratches can be prevented.

In the embodiment shown in FIG. 1B, the electrode 34 is formed up to the core side of the collar portion 14, and the lead wire 20 is joined to the core side by an appropriate method such as welding. Junction 36
And the coil 38 is coated with paint (not shown),
It is never exposed to the outside. Therefore, there is no risk of disconnection even if the parts rub against each other during plating or bulk mounting. The embodiment of FIG. 6C is also based on the same viewpoint.
Are formed not only on the surface of the collar portion 14 but also on the end portion of the core portion 12. The lead wire 20 is connected to the core portion 12
The inner electrode 42 formed above is joined by an appropriate method such as welding.

In the example shown in FIG. 2D, the electrode 44 is formed on the entire surface of the collar portion 14 as in the example of FIG. 1B, and the lead wire 20 is pressure-bonded through the electrode 44. There is. That is, the core-side corner portion 46 of the collar portion 14 is also covered with the electrode 44, and the lead wire 20 is in contact with the electrode 44 via the electrode 44. For this reason, the lead wire 20 rubs against the electrode 44, but since the electrodes 44 function as a buffer layer because they are made of the same metal, stress generation is reduced and disconnection is also reduced. In this example, the metal layer formed of the electrode is provided as the buffer layer between the collar portion and the lead wire, but another material may be provided as the buffer layer. For example, organic materials and carbon layers are suitable.

In the example shown in FIG. 3E, a step 52 is formed on the core side of the collar 50, and an electrode 54 is formed up to the step 52. The lead wire 20 is joined to the electrode 54 on the step 52 by an appropriate method such as welding. In this example as well, similar to the examples of (B) and (C) described above, the joint point 55 and the coil 38 are covered with paint (not shown) and are not exposed to the outside. Therefore, there is no risk of disconnection even if the parts rub against each other during plating or bulk mounting.

[0025]

Third Embodiment Next, a third embodiment will be described with reference to FIG. The element body 60 before obtaining the winding core is shown in FIG. The element body 60 has the length of the winding core, and the cutout portion 62 is formed at the end portion so as to be rotationally symmetrical. The thickness Δt of the cutout portion 62 substantially corresponds to the diameter of the lead wire, and the width Δw is less than half the total width of the element body 60. By processing a part of both ends of such an element body 60, a core 64 as shown in FIG.
At the end of the central core portion 66 of the winding core 64, there is a collar portion 68,
The collar portion 68 has a step 70 corresponding to the above-described cutout portion 62. Electrodes are formed on the end surface and side surfaces of the flange portion 68, including the surface of the step 70.

FIG. 3C shows how the coil lead wire 20 is joined to the winding core 64 as described above. The lead wire 20 is obliquely laid on the step 70 of the collar portion 68 from the core side, and is pressure-bonded to the electrode 72 on the step 70. Since the step 70 is formed relatively wide, the lead wire 20 can be joined obliquely to the longitudinal direction of the winding core 64. Therefore, the bending of the lead wire 20 at the joining position between the lead wire 20 and the corner of the collar portion 68 is small,
Bending stress is also small. Therefore, it is possible to favorably reduce the breakage of the leader line. Further, the winding width also becomes large, and the number of turns of the coil is increased to increase the L (inductance) value, or the thick winding is used to reduce the DC resistance value. As shown in FIG. 3D, a step 82 may be provided at the center of the side surface of the collar portion 80, but if the width is too large, the convex portion 84 at the end portion is likely to chip.

[0027]

Fourth Embodiment Next, a fourth embodiment will be described with reference to FIG. The examples shown in the same drawing are examples of various shapes of the groove formed on the side surface of the collar portion. First, in the example shown in FIG. 1A, a tapered groove 102 is formed in a central portion of a side surface of a collar portion (including an electrode) 100. The groove 102 is
It has a taper shape that gradually opens from the core end side toward the core side. By forming the groove 102 in such a taper shape, the bending stress of the coil lead wire 20 at the flange angle is relieved, and the disconnection is also reduced.

In the example shown in FIG. 3B, the taper shape is further expanded to form an arc-shaped groove 104. FIG. 7C corresponds to the embodiment of FIG.
A wide groove 106 is formed in the central portion of the side surface of the. The width of the groove 106 is set in consideration of the chipping described in FIG. By bending the coil lead wire 20 obliquely in the groove 106, bending stress can be similarly mitigated.

The example shown in FIG. 5D is an example in which the groove 108 is formed obliquely. The example shown in FIG. 3E is an example in which two grooves 110 are formed in an X shape. In the example of FIG.
There is only one direction along the groove 108 for alleviating the bending stress of the lead wire, which is inconvenient for the coil winding work. However, in the example of FIG. 6E, the stress relaxation directions are two opposite directions, which is convenient for the coil winding work. (F) and (G) of the figure are modified examples of (E) in which the grooves 112 and 114 are changed from an X-shape to a V-shape. (F) has a shape that opens from the core side toward the core end side, and (G) has a shape that opens from the core end side toward the core side. FIG. 6H is a modified example of FIG.
Has a bent configuration. FIG. 1I is a modified example of FIG. 1C in which the groove 118 has a wider structure. By doing so, the bending angle of the coil is further reduced.

In any of the examples, the bending angle of the lead wire at the core side angle of the collar portion is increased, the bending stress is relieved, and the disconnection is satisfactorily reduced. Further, since the joining distance between the lead wire and the electrode is longer than the width of the flange portion, the coupling force between the lead wire and the electrode is also improved. In the example of FIG. 4, all of the shapes of the groove viewed from the side surface of the collar are shown. However, if various groove shapes on the end face side as shown in FIG. It is possible to reduce the occurrence of

[0031]

Fifth Embodiment Next, a fifth embodiment will be described with reference to FIG. As described above, a coated copper wire is generally used as the coil, but the coating needs to be removed at the joint with the electrode. However, if the coating is peeled off, there is an inconvenience such as easy disconnection. Therefore, in this embodiment,
The joining of the coils is started without stripping the coating to reduce the occurrence of wire breakage. In the following example,
A case where the lead wire is pressure-bonded to the electrode by ultrasonic pressure bonding will be described.

FIG. 6A shows a state before pressure bonding. An electrode 202 is formed on the surface of the collar portion 200, and a lead wire 204 is laid on one side surface. The lead wire 204 is held by the ultrasonic transducer 206. In such a state, an arrow FB is shown in FIG.
As shown by, when the ultrasonic transducer 206 is vibrated, the coating 204A of the lead wire 204 is broken, the copper wire 204B is exposed, and the copper wire 204B comes into pressure contact with the electrode 202.

Here, as shown by the arrow FC, a gas for removing the coating is blown. When a reducing gas, for example, a nitrogen balance gas (forming gas) containing hydrogen in an amount of 2 vol% or less is blown to the bonding site, carbonization of the coating material is prevented and the coating material is decomposed and evaporated. Alternatively, when an oxidizing gas such as oxygen gas is blown, the coating material becomes carbon dioxide. As a result, the pressure-bonding interface and the coating 204A on the peripheral portion are favorably removed. Same figure (C)
Shows the state after pressure bonding, the copper wire 204B is pressure bonded to the electrode 202, and the coating 204A is removed.

As described above, according to this embodiment, the lead wire is pressure-bonded to the electrode while being covered. This prevents the risk of wire breakage due to mechanical removal of the coating from the copper wire. Further, unnecessary coating is removed with a reducing gas or an oxidizing gas. Therefore, the carbonized coating material has no adverse effect on the plating process, and the plating can be performed well. The same effect can be obtained by thermocompression bonding as well as ultrasonic pressure bonding. Thermocompression bonding and soldering may be combined. The coating may be removed by immersing it in a solvent (liquid) that dissolves the coating, in addition to gas.

[0035]

Sixth Embodiment Next, a sixth embodiment will be described with reference to FIG. First, the example shown in FIG.
The grooves 304 and 306 respectively formed in 0 and 302 are
It is formed in a direction along the winding direction of the coil 308. Therefore, as in the above-mentioned embodiment, the collar portions 300, 30
The bending angle on the core side of No. 2 is made obtuse to prevent disconnection. In the example shown in FIGS. 3B and 3C, the coil 322 wound around the core 320 is pulled out from the flange 3
By performing the operation from a position slightly apart from 24, the bending angle of the lead wire 326 at the corner portion of the collar portion 324 is relaxed, and the disconnection is prevented.

[0036]

Seventh Embodiment Next, a seventh embodiment will be described with reference to FIG. First, in the example shown in (A), the collar parts 400, 4
02, the conductive resin layers 416 and 418 are formed so as to cover the joints between the electrodes 404 and 406 of No. 02 and the lead wires 412 and 414 of the coil 410 wound around the core portion 408. For the conductive resin layers 416 and 418, for example, a conductive resin paste containing Ag is applied by a dip method and heat-cured (~ 1).
80 ° C.). The Paloma method may be used. The coil 410 is provided with an exterior coat 420, and the surfaces of the conductive resin layers 416 and 418 are plated 42.
2,424 are applied. According to this embodiment, the electrode 40
The joints between the lead wires 4,406 and the lead wires 412,414 are surely covered by the conductive resin layers 416,418, and are surely protected during mounting. In addition, the conductive resin layer 4
There is also an advantage that the protrusion of the outer coat 420 is hidden by the 16,418.

Next, the example shown in FIG. 8B is a case where there is a coating residue (gap) 426 between the electrode 404 and the exterior coat 420 in (A). If there is such a coating residue 426, the lead wire 41 is formed at this portion.
2 is exposed, causing wire breakage. However, in the present embodiment, the coating residue 4 is formed by the conductive resin layer 416.
The portion 26 is covered and protected, and the disconnection is satisfactorily prevented. The example shown in FIG. 7C is the conductive resin layer 4 shown in FIG.
This is an example in which 16 is formed only on the side surface side of the collar portion 400.
The same applies to the collar portion 402 on the opposite side.

[0038]

Eighth Embodiment Next, an eighth embodiment will be described with reference to FIG. (A) is a plan view and (B) is # 9 of (A).
FIG. 6 is a sectional view taken along line # 9 and viewed in the direction of the arrow. As shown in these figures, in the present embodiment, a wide groove 502 is formed on each side surface of the collar portion 500, and the collar portion 50 is formed.
Electrodes 504 are formed on the side surface and the end surface of 0. A coil 508 is wound around the core portion 506, and a lead wire 510 thereof is obliquely joined to the groove 502. Then, in the present embodiment, the exterior coat 512 of the core portion 506.
The groove 502 is filled with. Therefore, the lead wire 510 is protected by the exterior coat 512, the breakage thereof is prevented, and the side surface of the flange portion is flattened to improve the suction property at the time of mounting.

[0039]

Other Embodiments The present invention has many embodiments and can be variously modified based on the above disclosure. For example, the following is also included. (1) In the above-described embodiment, the core has a cylindrical shape and the collar has a quadrangular shape, but various core shapes may be used such as a quadrangular shape at the core center. There may be one groove in the flange portion for joining the coil lead wire, but it is convenient for mounting and adjusting the characteristics if it is provided on each side surface of the flange portion. The material used for each part may also be appropriately selected as needed. (2) Further, the above embodiments may be combined. For example, the embodiment of FIG. 1 and the embodiment of FIG. 5 are combined, the embodiment of FIGS. 1 to 5 and the embodiment of FIG. 6 are combined, and the like.

(3) In the above embodiment, the electrodes were formed with silver paste or the like, but various methods such as plating, sputtering and vapor deposition may be used. (4) In the above embodiments, the present invention is mainly applied to inductors, but in addition to that, common mode choke coils,
It can be applied to various wire-wound electronic components such as transformers and bead arrays. Further, the present invention can be similarly applied to a vertical wire-wound electronic component having a collar portion only at one end of the core portion. (5) In the above embodiment, silver paste was used, but in addition, C
A paste such as u, Ni, or Ni-Cr or a conductive resin may be used.

[0041]

As described above, the present invention has the following effects. (1) Since a groove is formed on the side surface of the flange portion so as to gradually become deeper from the end portion toward the core side, the bending stress of the lead wire bent at the core side corner portion of the flange portion is relaxed. It is possible to satisfactorily reduce the breakage of the lead wire and improve reliability and productivity. (2) A step or groove that is oblique with respect to the longitudinal direction of the winding core is formed on a side surface of the collar portion, and the lead wire and the electrode are joined by the obliquely formed step or groove portion, or the collar. A groove is formed on the side surface of the portion along the winding direction of the coil, and the lead wire and the electrode are joined by this groove, or a step or groove for joining the lead wire and the electrode is formed on the collar portion. Of the lead wire is formed in substantially the center of the side surface, so that the lead wire is joined in the groove so that the lead wire is oblique with respect to the winding core longitudinal direction, so that the bending stress of the lead wire is relaxed, It is possible to satisfactorily reduce disconnection. Further, since the direction in which the bending stress is relieved can be selected, the winding work efficiency of the winding can be improved.

(3) Since the buffer layer for covering the corner of the flange on the core side and the lead wire is formed so as to cover the corner, the influence of rubbing during plating or bulk mounting is reduced. As a result, the disconnection is similarly reduced. (4) Since the lead wire is joined to the electrode with the coating attached, and the unnecessary coating is removed after crimping and joining, the wire breakage is better than in the case where the coating is mechanically peeled before joining. Is reduced. (5) In the joint portion between the coil lead wire and the electrode, the remaining coating portion of the coil and the electrode are covered with the conductive resin layer, so that the joint portion is well protected and the disconnection is prevented. Will be done.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram showing a modification of the first embodiment.

FIG. 3 is a diagram showing a second embodiment of the present invention.

FIG. 4 is a diagram showing Embodiment 3 of the present invention.

FIG. 5 is a diagram showing a fourth embodiment of the present invention.

FIG. 6 is a diagram showing a fifth embodiment of the present invention.

FIG. 7 is a diagram showing Embodiment 6 of the present invention.

FIG. 8 is a diagram showing Embodiment 7 of the present invention.

FIG. 9 is a diagram showing an eighth embodiment of the present invention.

FIG. 10 is a view showing how the coil lead wire is joined to the collar portion.

[Explanation of symbols]

10, 64, 310 ... Core 12, 66, 320, 408, 506 ... Core part 14, 30, 50, 68, 80, 100, 200, 30
0, 302, 324, 400, 402, 500 ... Collar portion 16, 22, 102, 104, 106, 108, 11
0, 112, 114, 116, 304, 306, 502
... Grooves 18.34, 40, 44, 72, 202, 404, 40
6, 504 ... Electrodes 20, 204, 326, 412, 414, 510 ... Coil lead wires 32 ... Rounded portions 36, 54 ... Junction points 38, 308, 312, 322, 410, 508 ... Coil 42 ... Inner electrode 46 ... Core-side corners 52, 70, 82 ... Step 60 ... Element 62 ... Excision 84 ... Projection 204A ... Coating 204B ... Copper wire 206 ... Ultrasonic transducers 314, 316 ... Paint 416, 418 ... Conductive resin layer 420 , 512 ... Exterior coat 422, 424 ... Plating 426 ... Coating remainder

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuhiko Otsuka 6-16-20 Ueno, Taito-ku, Tokyo Taiyo Yuden Co., Ltd. (72) Nobuhiro Umeyama 6-16-20 Ueno, Taito-ku, Tokyo Taiyo Yuden Incorporated (72) Inventor Takayuki Uehara 6-16-20 Ueno, Taito-ku, Tokyo Taiyo Yuden Co., Ltd. (72) Inventor Iwa Fujikawa 6-16-20 Ueno, Taito-ku, Tokyo Taiyo Yuden Co., Ltd. ( 56) References JP-A-7-86041 (JP, A) JP-A-6-291160 (JP, A) JP-A-3-163808 (JP, A) JP-A-63-133475 (JP, A) Showa 56-110612 (JP, U) Actually open 2-110309 (JP, U) Actually open 57-97918 (JP, U) Actually open 3-1510 (JP, U) Actually open 3-23906 (JP , U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01F 5/04 H01F 27/29 H01F 41/10

Claims (7)

(57) [Claims] 1. A wire-wound electronic component, wherein a coil is wound around a core portion of a winding core provided with a collar portion, and a lead wire of the coil is joined to an electrode on a side surface of the collar portion. A wire-wound electronic component, wherein a groove is formed on a side surface of the flange portion so as to gradually become deeper from a winding core end toward a core portion, and the lead wire and the electrode are joined by the groove. 2. A wire-wound electronic component, wherein a coil is wound around a core portion of a winding core provided with a collar portion, and a lead wire of the coil is joined to an electrode on a side surface of the collar portion. A wire-wound electronic component, wherein a buffer layer that reduces the occurrence of stress due to rubbing between the core side corner of the flange and the lead wire is formed so as to cover the corner. 3. A wire-wound electronic component, wherein a coil is wound around a core portion of a winding core provided with a collar portion, and a lead wire of the coil is joined to an electrode on a side surface of the collar portion. A step or groove that is oblique with respect to the longitudinal direction of the winding core is formed on the side surface of the collar portion, and the step or groove that is obliquely formed,
A wire-wound electronic component, wherein the lead wire and the electrode are joined. 4. A wire-wound electronic component, wherein a coil is wound around a core portion of a winding core provided with a collar portion, and a lead wire of the coil is joined to an electrode on a side surface of the collar portion, A wire-wound electronic component, wherein a groove is formed on a side surface of the collar portion along a winding direction of the coil, and the lead wire and the electrode are joined to each other in the groove. 5. A wire-wound electronic component, wherein a coil is wound around a core portion of a winding core provided with a collar portion, and a lead wire of the coil is joined to an electrode on a side surface of the collar portion. A step or a groove for joining the lead wire and the electrode is formed substantially in the center of the side surface of the collar portion, and the lead wire is slanted with respect to the longitudinal direction of the winding core. Wire-wound electronic parts characterized by being joined by. 6. A coil is wound around a core portion of a winding core provided with a collar portion, and a lead wire of the coil is joined to an electrode on a side surface of the collar portion, and the coil is an exterior coat. In the wire-wound electronic component covered with, in the joint portion between the lead wire and the electrode, the remaining portion of the electrode and the lead wire covered by the outer coating, the conductive resin layer is coated. Wire wound type electronic components. 7. A method for manufacturing a wire-wound electronic component, wherein a coil is wound around a core portion of a winding core provided with a collar portion, and a lead wire of the coil is joined to an electrode on a side surface of the collar portion. Crimping the wire with the coating to the electrode, breaking the coating of the crimped portion and joining the wires, and removing the unnecessary coating broken by the coating removing agent. A method for manufacturing a wire-wound electronic component that features.