JPH10172832A - Wound electronic parts - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve Q (quality factor) without preventing a chip from being made small and lightweight. SOLUTION: When a magnetic flux is generated by energizing a coil 12, a part of the magnetic flux passes through steps 30 and 32 as shown by a dotted line L1 in the diagram (A) and through exposed parts 34 and 36 as shown by a dotted line L2 in the diagram (B). When the magnetic flux passes through the conductor part of electrodes 20 and 22 and platings 26 and 28, an eddy current tends to flow, increasing a loss. However, in this case, a magnetic route without conductor can be secured because of the steps 30 and 32 and exposed parts 34 and 36, and the Q can be improved as a whole, resulting in a filter circuit in which steep frequency characteristic can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to winding type electronic components such as inductors, transformers, and choke coils, and more particularly to an improvement in Q (quality factor).

[0002]

BACKGROUND ART Various types of wire-wound electronic components have already been put into practical use.
Various improvements have also been made. For example, 51-1
No. 15547 discloses that a coil is wound around a core portion of a core (coil bobbin) having a flange portion at an end portion, and a conductive layer is formed on a peripheral surface of the flange portion. And a fixed inductance element that is also connected to a conductive portion of a printed circuit board. Japanese Utility Model Laid-Open Publication No. 56-110612 discloses an inductance element in which a groove is formed in a flange portion and a coil end is accommodated in the groove.

Japanese Patent Application Laid-Open No. 57-73916 discloses that a terminal of a coil wound around the center of a core is connected to a conductor layer formed on a flange at an end of the core, and an electrode is provided on an end face after resin sealing. Are disclosed. Further, Japanese Utility Model Application Laid-Open No. 61-144616 discloses a chip coil in which a winding lead-out groove is provided in a square flange portion to lead a lead wire, and an electrode is also provided on a side surface of the flange portion.

[0004] As described above, the wire-wound electronic component has a structure in which a coil is wound around a core portion and a lead wire of the coil is joined to an electrode of a flange portion. Such a wound-type electronic component is used, for example, for a filter of about several kHz to several GHz. Of course, a filter circuit requires a sharp frequency characteristic, although it depends on the application. In order to obtain such a steep characteristic, as is well known, a higher Q is advantageous.

FIG. 15 shows a cross section of a general wound type electronic component. In the figure, a core 900 has a shape in which a flange 904 is provided at an end of a central core 902, and a coil 906 is wound around the core 902. An electrode 908 made of a conductive paste (for example, silver paste) is formed on an end surface and a side surface of the flange portion 904 by a suitable method such as a dipping method. Both leads 910 of the coil 906 are coupled to the electrode 908 of the flange 904 by a method such as thermocompression bonding. The electrode portions are thereafter plated 912, respectively.

When a current is applied to the coil 906 by the terminal electrode portions 914 and 916 at the ends, lines of magnetic force are generated, for example, as shown by a chain line in the figure. As a method for obtaining a wire-wound electronic component having a high Q, a magnetic path through which a magnetic flux passes is secured.
Alternatively, the magnetic flux density may be improved. However, it is necessary that the contrivance is in line with recent demands for chip miniaturization, weight reduction or height reduction.

The present invention focuses on the above points,
An object of the present invention is to improve Q of a wire-wound electronic component without hindering reduction in size and weight of a chip. Another object is to provide a wire-wound electronic component suitable for a filter circuit or the like that requires a steep frequency characteristic.

[0008]

According to the present invention, a coil is wound around a core portion of a core, and a lead wire of the coil is joined to an electrode of a flange portion. In the linear electronic component, a path of a magnetic flux generated by energizing the coil is provided on the core portion side or the core portion of the flange portion. According to the main mode, the passage is either a step or a taper formed between the flange and the electrode. According to another embodiment, the step is formed in a step shape. Alternatively, the core portion is formed in a shape having a surface inclined with respect to the longitudinal direction of the winding core.

Another invention is characterized in that a passage of a magnetic flux generated by energizing the coil is provided on a side surface of the flange. According to the main mode, the passage is any one of an exposed portion in which a part of the side surface of the flange is exposed, an insulating layer formed on the side surface of the flange, or a nonmagnetic layer. According to another embodiment, the insulating layer is an exterior resin of the coil.

Still another invention is characterized in that a path for a magnetic flux generated by energizing the coil is provided between a side surface of the flange and the electrode. Still another invention is characterized in that a path for a magnetic flux generated by energizing the coil is provided between an end surface of the flange and the electrode. According to the main mode, the passage is an unevenness formed in the flange. Still another invention is characterized in that a part of an electrode formed on the surface of the flange portion is removed to provide a path for a magnetic flux generated by energizing the coil. According to the main mode, the electrode is provided with a slit for cutting off the eddy current generated by the magnetic flux or reducing a loss due to a closed loop current in the electrode.

Still another invention is characterized in that the coil is formed by bundling a large number of coated conductors. Still another invention is characterized in that the diameter of the core portion is set to be larger than half the length of the flange portion, and the length of the core portion is set to be smaller than the length of the flange portion. .

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

[0013]

Embodiments of the present invention will be described below in detail with reference to examples. Fig. 1 (A)
1 shows a cross section of a wound electronic component according to one embodiment. In FIG. 1, a winding core 10 is provided at an end portion of a central cylindrical core portion 12 with an end surface quadrilateral or square plate-like flange portion 1.
4 and 16 respectively. Core part 1
A coil 18 is wound around 2. In addition, collar 14,
Electrodes 20 and 22 made of silver paste or the like are respectively formed on the end face and side face of 16 by a suitable method such as a dipping method. Both lead wires (not shown) of the coil 18 are respectively coupled to the electrodes 20 and 22 of the flange portions 14 and 16 by a method such as thermocompression bonding. Then, a resin 24 is coated on the coil winding portion as an exterior for covering protection. The electrode portions are then plated 26 and 28, respectively, to serve as connection terminals with the outside.

In this embodiment, the core 12 and the flange 1
Steps 30 and 32 are provided at the connection portions with the portions 4 and 16, respectively. The steps 30 and 32 are not provided with electrodes or plating. Also, the coil 18 is not wound. In the illustrated example, the resin 24 is applied to the core portion 12, but the resin may be applied to the steps 30 and 32.

The core 10 is formed by, for example, mixing ferrite or alumina and firing the mixture. And
The electrodes 20 and 22 are formed of a thin film layer or a thick film layer of 1 to 30 μm made of Ag, Ag-Pd, Ag-Pt, Cu, etc., and the platings 26, 28 are formed of Ni, Sn, Sn-Pb, etc. It is formed by a 10 μm layer. In addition, as an example of the dimensions, the length of the entire winding core 10 is about 1.6 mm, and the width and height are about 0.8 mm. The diameter of the core 12 at the center of the winding core is 0.2 to 0.7 mm.
Has a width of 0.2 to 0.5 mm.

Next, the operation of this embodiment will be described. Coil 12
A magnetic flux is generated by energizing the magnetic flux, and a part of the magnetic flux is generated by steps 30, 32 as illustrated by a chain line L1 in FIG.
You will pass through. When the magnetic flux tries to pass through the conductors of the electrodes 20, 22 and the platings 26, 28, an eddy current flows. Therefore, the magnetic flux does not easily pass through the conductor. However, in this example, a magnetic path without a conductor is secured by the steps 30, 32, and the Q
Will be improved.

Next, the width W1 of the steps 30, 32 is set with respect to the width W2 of the core portion 12 in consideration of the diameter and the number of turns of the coil 18 to be used. That is, by adjusting the width W1 of the steps 30, 32, the width W2 of the core 12 is reduced.
It can be set to an appropriate value corresponding to the coil diameter and the number of turns. For this reason, winding variation can be reduced.
The steps 30 and 32 are used for escape of the resin 24. Even if more resin 24 is attached than appropriate amount,
By escaping in the direction of the steps 30, 32, it is possible to secure a desired space in the resin portion or to secure a flat surface.

Next, the example shown in FIG.
The electrodes 20, 22 and the platings 26, 2
Exposed portions 34 and 36 having no 8 are formed. As compared with the example of FIG.
It can be considered as having the same height as 6. According to this example, the magnetic flux wraps around as exemplified by the chain line L2, and a magnetic path without a conductor is secured by the exposed portions 34 and 36. For this reason, Q improves as in the above-described example.
The exposed portions 34 and 36 also function as escape for the exterior resin 24.

Next, the example shown in FIG.
The tapered portions 38 and 40 are formed between the core 16 and the core 16. Magnetic flux passes through the tapered portions 38 and 40 as exemplified by a chain line L3, and a magnetic path is secured and Q is improved as in the above-described example.

Further, in this embodiment, there is an advantage that variation in dip immersion at the time of forming the electrodes 20 and 22 is reduced. Figures (B) and (C) show the state during dip immersion. (B) shows a case where the core 46 having the tapered portion 44 is dipped relatively shallowly with respect to the dipping liquid 42,
(C) is a case where it is immersed relatively deeply. As is clear from the comparison, the presence of the tapered portion 44 makes the formed electrodes substantially the same, and reduces the variation.

Further, in the present embodiment, a remarkable change in the magnetic flux path due to a dip immersion variation when the electrodes 20 and 22 are formed is reduced. As is clear from the comparison of FIGS. 9B and 9C, the presence of the tapered portion 44 makes it possible to obtain the structure shown in FIGS.
In either case, a magnetic flux path is ensured. on the other hand,
In the case where there is no taper as in (D) and (E), the electrode completely covers the flange as shown in (E) due to the dip immersion variation, and the passage of the magnetic flux is blocked.

FIGS. 2D and 2E show a state in which a core 50 having a general quadrangular prismatic flange portion 48 is immersed. (D) is a case where the entire flange portion 48 is not immersed in the dip liquid 42, and (E) is a case where the entire flange portion 48 is immersed in the dip liquid 42. In the case of (E), the core 50 may easily fall off from the carrier plate (not shown) due to the surface tension of the dip liquid 42. In addition, the variation in the electrodes is larger than that in the tapered shape. For this reason, the above-mentioned tapered flange is more advantageous. When the flange is tapered, the angle of the connecting portion between the electrode and the coil lead wire becomes dull, and disconnection at that portion is also prevented.

Next, the example shown in FIG.
Spiral or concentric steps 52 and 54 are provided at the connection between the core 16 and the core 16. FIG. 7B shows the step 52 at an enlarged scale. The width W3 of one step 52A is set substantially equal to the diameter of the coil 18, and the height W4 of the step 52A is set larger than the diameter of the coil 18.

In the examples of FIGS. 1A and 2 described above, the number of turns of the coil 18 is reduced due to the steps 30, 32 and the tapers 38, 40, but in this example, the steps 52, 54 are provided.
The required number of turns is ensured by spirally winding the coil 18 along. Further, as shown in FIG. 3B, the height W4 of the step 52A is larger than the coil diameter. For this reason, as exemplified by the chain line L4, the magnetic flux passes through this portion, and a magnetic path is formed. As described above, also in the present embodiment, it is possible to secure a magnetic path and improve Q.

FIG. 4 shows a modification of the above embodiment. Each of them has a core portion shape having a surface inclined with respect to the longitudinal direction of the winding core. First, (A)
Is to form the core portion 12A into a tapered shape,
It is an example of winding. According to this, as shown in FIG. 7B, the winding of the coil 18 is sparse at the large diameter portion of the core portion 12A, and the winding of the coil 18 is dense at the small diameter portion of the core portion 12A. For this reason, the magnetic flux leaks in the portion where the coil 18 is sparse, and the same effect as in the above embodiment can be obtained. FIG. 4C shows an example in which the core portion 12B is formed into a curved surface shape constricted at the center. In this case, (D)
As shown in the figure, the winding of the coil 18 becomes sparse at the large diameter portions at both ends of the core portion 12B, and the winding of the coil 18 becomes dense at the small diameter portion at the center of the core portion 12B. For this reason, the coil 18
The magnetic flux leaks at both ends where sparseness occurs, and the same effect as in the above embodiment can be obtained.

The example shown in FIG. 5A has a structure in which conductive foils 60 and 62 such as Cu or Ag are adhered to the side surfaces and end surfaces of the flange portions 14 and 16 by, for example, adhesives 56 and 58 containing glass. I have. These conductor foils 60 and 62 function as electrodes. According to this example, the magnetic flux passes as exemplified by the chain line L5 in the figure, and the magnetic path is secured by the nonmagnetic material (or the insulating layer) by the adhesives 56 and 58, so that Q is improved. In addition, you may make it cover a conductor cap instead of the conductor foils 60 and 62.

The example shown in FIG. 2B is similar to the example shown in FIG. 1A, in which an insulating layer 64 is formed on the entire surface of the winding core 10. Of course, by providing the insulating layer 64 at the flange portions 14 and 16, the same effect as in the example of (A) can be obtained, but manufacturing is easier if the insulating layer 64 is provided over the entire core. In the example of (C), a suitable material is diffused on the surfaces of the flange portions 14 and 16 to form the nonmagnetic layer 66. Such a nonmagnetic layer 66 is also formed of the adhesives 56 and 58 and the insulating layer 6.
It works in the same way as 4 and can improve Q.

In addition, the electrode itself is made of a metal having a high specific resistance,
For example, even if it is made of Ag-Pd, Ru or the like,
The eddy current is less likely to flow and Q is improved. Further, the electrode itself may be formed of, for example, a conductive resin paste or a material having magnetism obtained by mixing Ag and ferrite (or iron powder) in the conductive resin paste. Because the electrodes are magnetic, the flow of magnetic flux is improved,
Q is improved.

In the example shown in FIG. 6A, the outer resin 68 of the coil 18 is covered with the side surfaces of the flanges 14 and 16 and formed into a square shape. The electrodes 70 and 72 are formed of Ag paste or the like on a part of the end surfaces of the flanges 14 and 16, and the lead wire of the coil 18 is connected around the flanges 14 and 16 (not shown). Alternatively, copper plates 74 and 76 may be attached as shown in FIG. Thereafter, as shown in FIG. 3A, conductive resin pastes 78 and 80 are applied from the exterior resin 68 on the side surfaces of the flange portions 14 and 16 to the electrodes 70 and 72.

The conductive resin pastes 78 and 80 are formed so as to cover the entirety of the electrodes 70 and 72 in FIG. However, for example, as shown in an end face in FIG. The slits 82 are formed in the conductive resin pastes 78 and 80 in the example of FIG. 3C, and the slits 84 are formed in the example of FIG.

In the above example, as illustrated by the dashed line L6 in FIG. 7A, the magnetic flux passes through the exterior resin 68 to secure the magnetic path, and the Q is improved. (C), (D)
Then, the slits 82, 8 are formed in the conductive resin pastes 78, 80.
Since the number 4 is provided, the eddy current is cut off, the loss due to the closed loop current is reduced, and the Q is improved. In other words, an eddy current flows through the electrodes and the conductive resin due to the passage of the magnetic flux. This means that these conductors act in the same way as a kind of coil, and acts like a mutual inductance with the coil being the primary side and the conductor being the secondary side. However, if the eddy current is cut off by the slit, the effect of the mutual inductance is reduced, and the magnetic flux is easily passed and Q is improved.

Further, in this embodiment, since the exterior resin 68 covers the side surfaces of the flange portions 14 and 16, the square molding can be easily performed, and further, the end of the exterior resin 68 is made conductive. There is also an advantage that there is little danger of being covered with the resin pastes 78 and 80 and exposed to the outside.

In the example of FIG. 7A, a concave portion 88 is formed on each side surface of the flange portion 86, and a frame-shaped electrode cap 90 is put on the concave portion 88 as shown by an arrow F1. At this time, the lead 18 </ b> A of the coil 18 is held between the bottom surface of the concave portion 88 and the electrode cap 90. Then, the end face becomes as shown in FIG. 7B, and the concave portion 88 serves as a gap to serve as a magnetic flux passage. Therefore, Q is improved.
The same applies to the flange on the opposite side of the core.

In the example shown in FIG. 3C, a saw-like unevenness 94 is formed on the side surface of the flange 92, and the lead 18 A of the coil 18 is sandwiched between the unevenness 94 and the electrode cap 90. Configuration. Also in this example, the magnetic flux passes through the gap 96 formed between the unevenness 94 and the metal cap 90, and the Q is improved as in the above example.

In the example shown in FIG. 8A, a groove 100 is formed on each side surface of the flange 98, and a protrusion 102 is formed on the end surface. In the illustrated example, it has a circular convex shape. Then, in this example, the box-shaped electrode cap 104 is put on the flange 98 as shown by the arrow F2. At this time, the lead 18A of the coil 18 is
It is sandwiched and held between the bottom surface and the electrode cap 104.
The main cross section of the flange portion is as shown in FIG. 4B, and the end face of the flange portion 98 and the electrode cap 104 are
Is formed between them, and the magnetic flux passes through this portion, so that the Q can be improved.

The example shown in FIG. 3C has a configuration in which a convex portion 110 is formed on the side surface of the flange portion 108 and a convex portion 112 is formed on the end surface. In this example, the convex 110 is circular, and the convex 1
12 has a linear shape. Also in this example, as in the above-mentioned example, the electrode cap 104 has the flange 1 as shown by the arrow F3.
08. At this time, the lead wire 18 of the coil 18
A has a main section of the flange portion sandwiched and held between the convex portion 110 and the electrode cap 104 as shown in FIG. A gap 114 is formed between the end face and the electrode cap 104, and the magnetic flux passes through this portion to improve Q.

It is to be noted that, as the shape of the convex portion for forming the gaps 106 and 114, there are, of course, various shapes other than the shape shown in FIG. 8, and any shape may be used. Good. For example, in the case where the center of the end face of the flange portion of the winding core is fixed on the shaft and the rotary processing is performed, a circular convex portion is easily formed. Further, the same effect can be obtained even if a convex portion is formed inside the electrode cap.

Next, in the example shown in FIG. 9, the area of the electrode is reduced to secure a magnetic flux path, and the Q is improved. First, in the example shown in FIG. 7A, a concave portion 118 is formed on the end face of the flange portion 116, and is immersed in a dipping liquid 120 as shown in FIG. Then, the core electrode 120 is formed along the square frame shape around the concave portion 118 as shown in the main cross section in FIG. Lead wire for coil (not shown)
Is connected to the electrode 120 around the side surface of the flange portion 116. According to this example, the portion of the concave portion 118 serves as a magnetic flux passage, and Q is improved.

The concave portion may be formed after forming the electrode. First, as shown in FIG. 2F, a flange 122 having no irregularities is immersed in a dipping liquid 120 to form an electrode film. Thereafter, when the concave portion 126 is formed so as to be hollowed out, the electrode 124 is formed as shown in a perspective view in FIG. An electrode may be formed on the side surface of the flange portion, and the lead wire of the coil may be connected on this side surface. The example shown in FIG. 9G is an example in which a circular concave portion 130 is formed on the end face of the flange portion 128, and this is immersed relatively deeply in the dipping liquid 120 as shown in FIG. is there.

The above-mentioned example is an example in which a concave portion is formed on the end face of the flange portion, but the following embodiment is an example in which a convex portion is formed on the end surface of the flange portion. First, in the example of FIG. 10A, a convex portion 136 is formed on the end surface of the flange portion 134, and as shown in FIG. 10C, the electrode film is formed by dipping in a dipping liquid. Then, the convex portion 136
The electrode 138 is formed by removing the electrode film on the surface portion of. The main cross section is as shown in FIG.
FIGS. 3D to 3F correspond to the above-described (A) to (C), respectively, and show an example in which the electrode 140 is formed to the side surface of the flange portion 134 by immersing it relatively deeply in the dipping liquid 120. It is. In the example of FIG. 11G, the convex portion 142 is circular. In FIG. 7H, an electrode 146 is formed on the entire side surface and end surface of the flange portion 144 having no irregularities, and the exposed portion 148 is formed by removing the electrode 146 on a part of the end surface.
In any of the examples, the magnetic flux passes through the portion of the end face of the flange portion where there is no electrode, and the Q is improved.

If the electrode portion is cut after the completion of the wound electronic component, the inductance value can be adjusted. Normally, as the electrode area decreases, the magnetic flux passes more easily, and the inductance value improves.

Also in the following example, the area of the electrode is reduced. The example of FIG. 11A is an example in which a groove 150 for connecting a coil lead wire is formed on a side surface of a flange portion 148.
Electrodes 152 are formed at the four corners of the flange except for these grooves 150. A cross-shaped slit 154 is formed on the end face of the flange 148 so as to connect the groove 150, and the center of the slit 154 has a circular shape so as to reduce the electrode area. According to this example, while the magnetic flux passes through the slit 154, the loss due to the closed loop current is reduced, and the Q is improved. The example shown in FIG. 7B is an example in which the slit 156 has a cross shape as compared with the example of FIG. The example of (C) is different from the example of (B) in that the electrodes 158 are formed in a cross shape from the groove 150 on the side surface of the flange portion 148 to the end surface.
Is formed.

In the examples of FIGS. 4D and 4E, in order to further reduce the electrode area, the electrodes 160 and 16 are formed only in the groove 150.
2 are formed respectively. The shape of the electrode is different between the example of (D) and the example of (E). The four electrodes 160 on the side surface of the flange portion are preferably electrically connected from the viewpoint of mounting. Therefore, if necessary, an electrode for connection is formed on the side surface of the flange portion or on the side surface. I do. The same applies to the electrode 162. In the example of (F), a porous electrode 164 is formed on the entire side surface and end surface of the flange portion 148. Since the magnetic flux passes through the hole of the electrode 164, Q is improved, and the function of releasing the magnetic flux and the function as the electrode can be used. In the example of FIG. 3G, the electrode area is further reduced.
The electrode 165 is formed only on one of the 48 side surfaces.

FIG. 12A shows an example in which electrodes 166 are formed in a triangular pyramid shape at two opposing tops of a flange 148. Since there is a wide slit 167 across the flange portion 148, eddy current is cut off and a magnetic flux path is secured. In the example of FIG. 13B, a groove 150 for connecting a coil lead wire is formed on the side surface of the flange 148 in the example of FIG. In the example of FIG. 9C, a core electrode 168 is formed around the side and end faces of the flange 148, and a non-magnetic layer 170 made of an insulating material such as resin is formed at the center of the end face of the flange 148. It is. The main cross section of (C) is as shown in (D). The example shown in FIG.
The electrode 172 is formed on the side surface of the. The end face side of the flange 148 has a degree to which a fillet is formed to some extent.
Further, a slit 174 is formed in a part of the electrode 172 to prevent eddy current from flowing. A plurality of slits may be provided.

FIG. 13 shows an example relating to a coil. In the case of a high frequency, a current flows only on the surface of the coil conductor 200 as shown by hatching in FIG. For this reason, the cross-sectional area of the coil conductor 200 is not effectively utilized, and the resistance increases and Q decreases. However, as shown in FIG. 2B, if a large number of coil conductors 202 coated with the coating 201 are used in a bundle, the effective area through which current flows increases, the resistance decreases, and Q increases. . Further, since the coil conductor 202 is easily bent, there is an advantage that stress generated when the coil conductor 202 is wound around a small-diameter core portion or bent at an acute angle by a flange portion is small. In the example of FIG. 3C, the coil conductors 202 are arranged in a ribbon shape. In the example of FIG. 3D, the coil conductor 204 has a ribbon-shaped cross section.

FIG. 14 shows an example relating to the winding core shape. For example, in the case of a bobbin shape as shown in FIG. 7B, the cross-sectional area of the central core portion 300 is small, so that the magnetic resistance increases, and the flow of the magnetic flux is hindered, so that Q decreases. Further, since the width of the flange 302 is small, the core 300
The magnetic flux inside passes through the electrode 304 formed on the flange 302, and generates an eddy current, which acts to reduce Q. Therefore, as shown in FIG. 2A, the diameter (or width) D of the core portion 210 is
With respect to the length LA of the flange 212, a condition of 0.5LA ≦ D is satisfied. Also, the length LB of the core portion 210
To satisfy the condition of LA ≧ LB with respect to the length LA of the flange portion 212. It has been experimentally confirmed that by doing so, the magnetic resistance of the magnetic path is reduced and Q is improved. Also, the strength of the core is improved.

The present invention has a number of embodiments,
Various modifications can be made based on the above disclosure. For example, the following is also included. (1) In the above-described embodiment, the core portion has a cylindrical shape and the flange portion has a rectangular shape. However, the core portion has a rectangular column shape, a cylindrical shape having no distinction between the flange portion and the core portion, and a prismatic shape. Various core shapes such as shapes may be used. The same applies to the presence or absence of a groove on the side surface of the flange. The groove of the flange portion for joining the coil lead wire may be provided at one position, but if provided on the side surface of the flange portion, it is convenient for mounting and characteristic adjustment. The material used for each part may be appropriately selected as needed.

(2) The above embodiments may be combined. For example, if the example of the electrode structure shown in FIGS. 6 to 12 is combined with the example shown in FIGS.
Can be improved. These are shown in FIGS.
May be further combined.

(3) In the above embodiment, the electrodes are formed by silver paste or the like, but various methods such as plating, sputtering, and vapor deposition may be used. (4) In the above embodiment, the present invention was mainly applied to an inductor.
It can be applied to various wire-wound electronic components such as transformers and bead arrays. Further, the present invention is similarly applicable to a vertical wound electronic component having a flange at only one end of the core. (5) In the above embodiment, silver paste was used.
A paste such as u, Ni, Ni-Cr or a conductive resin (conductive adhesive) may be used.

[0050]

As described above, according to the present invention,
A magnetic flux path is formed around the flange or in the core area by steps or insulating layers, or a part of the electrodes is removed to form a magnetic flux path. Q can be improved without any problem. In addition, since the eddy current is cut off by forming a slit in the electrode and the shape of the coil and the winding core is devised, the Q also increases. Further, since a good Q is obtained, a filter circuit requiring a steep frequency characteristic can be configured.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of an embodiment of the present invention.

FIG. 2 is a main cross-sectional view showing an example of an embodiment of the present invention and a state at the time of dipping.

FIG. 3 is a cross-sectional view and a partially enlarged view showing a main part of an example of the embodiment of the present invention.

FIG. 4 is a cross-sectional view and a partially enlarged view showing a main part of an example of the embodiment of the present invention.

FIG. 5 is a sectional view showing a main part of an example of the embodiment of the present invention.

FIG. 6 is a sectional view and a side view showing a main part of an example of the embodiment of the present invention.

FIG. 7 is a perspective view and a side view showing a main part of an example of the embodiment of the present invention.

FIG. 8 is a perspective view and a sectional view showing a main part of an example of the embodiment of the present invention.

FIG. 9 is a perspective view and a sectional view showing a main part of an example of the embodiment of the present invention and a state at the time of dipping.

FIGS. 10A and 10B are a perspective view and a cross-sectional view showing a main part of an example of the embodiment of the present invention and a state at the time of dip.

FIG. 11 is a perspective view and an enlarged view showing a main part of an example of the embodiment of the present invention.

FIG. 12 is a perspective view and a sectional view showing a main part of an example of the embodiment of the present invention.

FIG. 13 is a sectional view showing a main part of an example of the embodiment of the present invention.

FIG. 14 is a side view showing a main part of an example of an embodiment of the present invention and a side view showing a comparative example.

FIG. 15 is a main cross-sectional view showing a state of a magnetic flux in the wire-wound electronic component.

[Explanation of symbols]

10: Core 12, 12A, 12B, 300, 210 ... Core 14.16, 48, 86, 92, 108, 116, 12
2, 128, 134, 144, 302, 212 ... Flange 18 ... Coil 18A ... Lead wire 20, 22, 70, 72, 120, 124, 132, 1
38,140,146,152,160,162,16
4,166,168,172,304 ... electrode 24 ... resin 26,28 ... plating 30,32,52A ... step 34,36,148 ... exposed part 38,40 ... tapered part 42,120 ... dip liquid 44 ... tapered part 46, 50: winding core 52, 54: stepped step 56, 58 ... adhesive 60, 62 ... conductor foil 64 ... insulating layer 66, 170 ... nonmagnetic layer 68 ... exterior resin 74, 76 ... copper plate 78, 80 ... conductive resin Pastes 82, 84, 154, 156, 167, 174: slits 88, 118, 126, 130: recesses 90, 104: electrode caps 94: irregularities 96, 106: gaps 100, 150: grooves 102, 110, 112, 136 142 ... convex part 200, 202, 204 ... coil conductor 201 ... coating

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Nobuo Mamada 6-16-20 Ueno, Taito-ku, Tokyo Inside Taiyo Denki Co., Ltd. (72) Inventor Iwao Fujikawa 6-16-20 Ueno, Taito-ku, Tokyo Taiyo (72) Inventor Nobuhiro Umeyama 6-16-20 Ueno, Taito-ku, Tokyo Taiyo Electric Co., Ltd. (72) Inventor Takayuki Uehara 6-16-20 Ueno, Taito-ku, Tokyo Taiyo Electric Inside (72) Inventor Hideo Aoba 6-16-20 Ueno, Taito-ku, Tokyo Taiyo Denki Co., Ltd. (72) Inventor Nobuyasu Shiba 6-16-20 Ueno, Taito-ku, Tokyo Taiyo Denki Inside

Claims (14)

[Claims] 1. A wound electronic component in which a coil is wound around a core portion of a core, and a lead wire of the coil is joined to an electrode of the flange portion. And a path for a magnetic flux generated by energizing the coil. 2. The wire-wound electronic component according to claim 1, wherein the passage is one of a step and a taper formed between the flange and the electrode. 3. The wound electronic component according to claim 2, wherein the step is formed in a step shape. 4. The wire-wound electronic component according to claim 1, wherein the core portion has a shape having a surface oblique to the longitudinal direction of the winding core. 5. A wire-wound electronic component in which a coil is wound around a core portion of a winding core, and a lead wire of the coil is joined to an electrode of a flange portion. A winding type electronic component comprising a path of a magnetic flux generated by energization of the electronic component. 6. The wire-wound electronic component according to claim 5, wherein the passage is an exposed portion in which a part of the side surface of the flange portion is exposed, or an insulating layer or a non-magnetic layer formed on the side surface of the flange portion. 7. The wire-wound electronic component according to claim 6, wherein the insulating layer is made of an exterior resin of the coil. 8. A wire-wound electronic component in which a coil is wound around a core portion of a winding core, and a lead wire of the coil is joined to an electrode of the flange portion. A winding type electronic component, wherein a path of a magnetic flux generated by energizing the coil is provided between the coils. 9. A wire-wound electronic component in which a coil is wound around a core portion of a winding core, and a lead wire of the coil is joined to an electrode of a flange portion, wherein an end face of the flange portion and the electrode are connected to each other. A winding type electronic component, wherein a path of a magnetic flux generated by energizing the coil is provided between the coils. 10. The wire-wound electronic component according to claim 8, wherein the passage is an uneven portion formed on the flange. 11. A wire-wound electronic component in which a coil is wound around a core portion of a winding core, and a lead wire of the coil is joined to an electrode of a flange portion. A winding type electronic component, wherein a part of a magnetic flux generated by energizing the coil is provided by removing a part thereof. 12. The wire-wound electronic component according to claim 11, wherein the electrode is provided with a slit for cutting off an eddy current generated by the magnetic flux. 13. A wire-wound electronic component in which a coil is wound around a core portion of a winding core, and a lead wire of the coil is joined to an electrode of a flange portion. A wire-type electronic component characterized by comprising: 14. A wire-wound electronic component in which a coil is wound around a core portion of a core, and a lead wire of the coil is joined to an electrode of the flange portion. And a length of the core portion is set to be smaller than a length of the flange portion.