JP2001155932A - Inductor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To offer an inductor which can reduce its height to a minimum and enables attainment of high evenness and to prevent the variability in height among a plurality of inductors, even when an edgewise coil of a flat and square wire having a thick thickness is used. SOLUTION: Square recesses 13, 13 on the backside of a base 1 are provided with square holes 14, 14, and cutouts 12, 12 are arranged beside the recesses 13, 13 in a marginal part of the base 1. An anchoring rib 21 is formed on the bottom plane of a terminal 2. The terminals 2, 2 are engaged in the cutouts 12, 12 and in the recesses 13, 13 which are formed on the base 1. The ribs 21, 21 are bent toward the inside of the holes 14, 14 of the recesses 13, 13, by which the terminals 2, 2 are anchored to the base 1. Both ends of an edgewise coil 3 are in contact with the terminals 2, 2 respectively, and the ends of the coil 3 are fixed to the terminals 2, 2 with a solder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inductor having an edgewise coil formed by flat winding a rectangular wire.

[0002]

2. Description of the Related Art FIG. 7 is a perspective view showing an edgewise coil. As shown in FIG. 7, the edgewise coil is a so-called flat-wound winding in which a rectangular wire is spirally wound such that the long side of the longitudinal section rectangle is in the radial direction. Since such an edgewise coil has a high linearity and a low conductor resistance, a large current can be continuously passed through the edgewise coil. Therefore, a choke inductor having a built-in edgewise coil is often used as a surface mount component in a power supply circuit or the like of an information communication device that is becoming smaller and shorter.

FIG. 8 is a perspective view showing a conventional choke inductor having an edgewise coil. In FIG.
It is an edgewise coil. The edgewise coil 35 is fixed to the center of one surface of a base 31 made of an insulating synthetic resin material having a substantially square shape in plan view so that the winding end portion or the winding start portion of the edgewise coil 35 abuts. The one-sided edge of the base 31, which is opposed to the extending portion 37 slightly extended from the winding start portion or the winding end portion that is not in contact with the base 31 of the edgewise coil 35, A convex portion 32 supporting the portion 37 is provided, and one end of the edgewise coil 35 connected to the extending portion 37 is formed in a U-shape on the back surface of the base 31 following the edge of the convex portion 32 in the thickness direction. The first terminal portion 41 is formed by bending. Further, the second terminal portion 42 is formed by bending the other end of the edgewise coil 35 in a U-shape to the back surface of the base 31 following the edge of the base 31 in the thickness direction.

Such a choke inductor has two terminal portions bent to the back surface of the base 31 of the edgewise coil 35.
41 and 42 were surface-mounted on the printed circuit board by fixing them to the contacts provided on the printed circuit board with solder.

[0005]

While it is required for such inductors to pass a larger current, it is also required to reduce the height of the inductor as much as possible. In order to satisfy the former requirement, an edgewise coil 35 having a thick rectangular wire is used,
In such an edgewise coil 35, it is difficult to bend both ends of the edgewise coil 35 into a U-shape from a predetermined position. As a result, the bent position of the edgewise coil 35 varies, the dimension of the U-shaped corner increases, the flatness of both terminal portions 41 and 42 is low, and the height varies among a plurality of inductors. There was a problem that occurs. In addition, since both terminal portions 41 and 42 are formed by bending the rear surface of the base 31, the height of the inductor increases as the thickness of the rectangular wire increases.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a configuration in which both ends of an edgewise coil are separately connected to at least two terminal components provided on a substrate. Even when an edgewise coil having a thick rectangular wire is used, the flatness is high, and it is possible to prevent a variation in height among a plurality of inductors, and to reduce the height as much as possible. It is to provide an inductor that can be lowered.

[0007]

According to a first aspect of the present invention, there is provided an inductor in which an edgewise coil is supported by a substrate made of an insulating material, wherein the substrate has at least two terminal parts. And the two ends of the edgewise coil are separately connected.

Since the two terminal parts provided on the substrate and the edgewise coil are separate parts, terminal parts having high dimensional accuracy can be prepared in advance by press working or the like, and the terminal parts are mounted on the substrate. Keep it. Then, the end of the edgewise coil and the terminal component are connected by soldering or the like. Since the dimensional accuracy of the terminal component mounted on the substrate is high, the flatness of the inductor is also high. Further, since the end of the edgewise coil is connected to the terminal component, the thickness of the edgewise coil hardly affects the flatness of the inductor. Therefore, regardless of the thickness of the edgewise coil, it is possible to prevent a variation in height among a plurality of inductors, and to reduce the height of the inductor as much as possible.

In an inductor according to a second aspect of the present invention, in the first aspect, the two terminal parts are formed in a U-shape, and the two terminal parts are externally fitted to an edge of the substrate.

[0010] Since the U-shaped terminal component is fitted around the edge of the substrate, the terminal component can be easily attached to the substrate. Then, an end of the edgewise coil is connected to a portion of the terminal component on one surface side of the substrate, and a portion of the terminal component on the other surface side of the substrate is connected to a contact of the printed circuit board, whereby the inductor is surface-mounted.

The inductor according to a third aspect of the present invention is the inductor according to the second aspect, wherein a concave portion is formed on a surface of the substrate opposite to a surface supporting the edgewise coil and opposed to the terminal components. It is characterized in that both terminal parts are fitted in both recesses.

Since the terminal components are fitted in the concave portions provided on the substrate, the positioning when attaching the terminal components to the substrate is easy. On the other hand, since the terminal component is fitted in a surface of the substrate opposite to the surface on which the edgewise coil is provided, that is, in the concave portion provided on the mounting surface when the inductor is surface mounted, the mounting surface and the terminal Can be made substantially flush. Thereby, the height of the inductor can be made as low as possible.

According to a fourth aspect of the present invention, in the third aspect of the present invention, in the third aspect of the present invention, holes are provided in the two concave portions, and fixing tongue pieces are provided in portions facing the holes of the two terminal components. The terminal parts are fixed to the substrate by bending the tongue pieces into the corresponding holes.

The terminal component is fixed to the substrate by bending the fixing tongue provided on the terminal component into the hole of the concave portion provided on the substrate. It can be done reliably.

According to a fifth aspect of the present invention, there is provided the inductor according to any one of the first to fourth aspects, wherein two positioning ribs for adjusting a connection position to a portion of the terminal component to which an edgewise end of the edgewise coil is connected. However, the width of the edgewise coil is substantially the same as the width of the end of the edgewise coil, and the edgewise end of the edgewise coil is fitted between the two positioning ribs.

Since the end of the edgewise coil is fitted between the two positioning ribs protruding from the terminal component, the positioning when connecting the terminal component of the edgewise coil to the terminal component can be performed quickly. Can be done.

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, in the fifth aspect, the fixing rib for fixing the end of the edgewise coil to the terminal component intersects a line connecting the two positioning ribs. Wherein the fixing rib is bent to fix the end of the edgewise coil fitted between the positioning ribs.

Since the fixing rib provided on the terminal component is bent to fix the end of the edgewise coil fitted between the positioning ribs, the terminal component at the end of the edgewise coil is fixed. Can be fixed quickly.

According to a seventh aspect of the present invention, in the inductor according to any one of the first to sixth aspects, the edgewise coil is supported by the substrate with a center axis crossing the substrate.
At a portion facing the portion surrounded by the inner peripheral edge of the edgewise coil of the substrate, a through hole penetrating the substrate is opened,
The center leg of the tripod-shaped core is inserted into the through hole and the edgewise coil.

Since the center leg of the tripod-shaped core is inserted into the through-hole penetrating the substrate and the edgewise coil, the leakage magnetic flux from the edgewise coil is reduced, and the inductance of the edgewise coil is improved.

[0021]

Embodiments of the present invention will be specifically described below with reference to the drawings. (Embodiment 1) FIG. 1 is a perspective view showing an inductor according to the present invention. In FIG. 1, reference numeral 1 denotes a rectangular shape in plan view using an insulating synthetic resin material such as a liquid crystal polymer or a phenol resin. It is a base molded into. At one edge of the base 1, two terminals 2 and 2 formed by press molding a short groove-shaped part having a substantially U-shape in side view are fixed.

FIG. 2 shows the base 1 and the terminals 2 and 2 shown in FIG.
2 is an exploded perspective view of FIG. On the back surface of the base 1 and on both short sides of the rectangle, there are provided strip-shaped projections 11 and 11. On the bottom surface of one convex portion 11, two rectangular concave portions 13 having substantially the same dimensions as the thickness and width of the terminals 2 are provided at a distance.
Both rectangular recesses 13 are provided with square holes 14 respectively. Further, the rectangular recess 13,
A cutout 12, 12 having a size substantially the same as the thickness and width of the terminal 2, 2 is provided facing the terminal 13.

The terminal 2 has a portion corresponding to the bottom side slightly longer than a portion corresponding to the top side of the U-shape. Further, the bottom surface of the terminal 2 is provided with two notches to form an E-shape when viewed from the rear, so that the terminal 2 has a tongue-shaped fixing on the bottom surface to fix the terminal 2 to the base 1. A rib 21 is provided. These two terminals 2, 2 are fitted into the notches 12, 12 and the rectangular recesses 13, 13 provided in the base 1, and the fixing ribs 21, 21 of the terminals 2, 2 are fitted into the rectangular recesses 13, 2. The terminals 2 and 2 are fixed to the base 1 by being bent into holes 14 and 14 provided in the base 13.

An edgewise coil 3 is provided on the surface of the base 1.
However, they are brought into contact with each other so that the center axis is substantially perpendicular to the center of the base 1. The vicinity of one end of the edgewise coil 3 on the side separated from the base 1 is bent in a crank shape, and the bent one end and the other end of the edgewise coil 3 are located at substantially the same height. Both ends of the edgewise coil 3 are coated with solder, and portions other than both ends of the edgewise coil 3 are insulated by coating with enamel. Then, both ends of the edgewise coil 3 are connected to the base 1.
The ends of the edgewise coil 3 are fixed to the terminals 2 and 2 by soldering.

In such an inductor, the terminals 2 and 2 having high dimensional accuracy can be easily manufactured by press working or the like, and the notches 12 and 12 and the rectangular recess 13 are formed in the base 1 as described above. , 13 are provided, the terminals 2 and 2 can be attached to the base 1 with high accuracy.
Further, the flatness of the back surface of the base 1 is high. Further, since both ends of the edgewise coil 3 are fixed to the upper surfaces of the terminals 2 and 2 by soldering, even when the thick edgewise coil 3 is used, the flatness of the rear surface of the base 1 is affected. The height variation among the plurality of inductors is suppressed as much as possible.

Further, even when the thick edgewise coil 3 is used, the thickness of the terminals 2 is substantially constant, so that an increase in the height of the inductor can be suppressed as much as possible. it can. In addition, since the terminals 2 and 2 are fitted into the rectangular recesses 13 and 13 provided on the back surface of the base 1, the back surface of the base 1 and the bottom surfaces of the terminals 2 and 2 can be made substantially flush. In addition, the height of the inductor can be made as low as possible.

(Embodiment 2) FIG. 3 is a schematic perspective view showing Embodiment 2, and FIG. 4 is an explanatory view for explaining a method of assembling the inductor shown in FIG. In the present embodiment, the mounting accuracy of both ends of the edgewise coil 3 can be improved. Two ribs 22 for positioning the terminal 2 in contact with the end of the edgewise coil 3 are provided with two positioning ribs 22, 22 for adjusting the contact position at a distance substantially equal to the width of the end of the edgewise coil 3. The edge of the edgewise coil 3 is fitted between the positioning ribs 22 and 22. These positioning ribs 22,22
Are formed by erecting portions having predetermined dimensions from both side edges of the terminal 2, for example. In FIGS. 3 and 4, portions corresponding to those shown in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.

At a substantially center between the positioning ribs 22 of the terminal 2, a strip-shaped fixing rib 23 for fixing an end of the edgewise coil 3 is provided with two notches in the terminal 2. Provided by When the terminal 2 is mounted on the base 1, the fixing rib 23 is upright. Terminal 2, 2
Is attached to the base 1 in the same manner as before, one end of the edgewise coil 3 is fitted between the positioning ribs 22 of the one terminal 2, and the tip thereof is brought into contact with the fixing rib 23. Then, the fixing rib 23 is bent along the one end of the edgewise coil 3 to press and fix the one end. Similarly, the other end of the edgewise coil 3
The other terminal 2 is fitted between the positioning ribs 22,
The fixing ribs 23 are pressed and fixed by bending.
Then, the terminals 2 and 2 and both ends of the edgewise coil 3 are soldered.

As described above, since both ends of the edgewise coil 3 are separately fitted between the positioning ribs 22, 22, 22, 22 of the terminals 2, 2, the edgewise coil 3 is attached to the base 1. An operation with high mounting accuracy can be performed quickly. Also, by bending the fixing rib 23,
Since the end of the edgewise coil 3 is fixed, the fixing operation is easy, and the operation can be performed quickly.

(Embodiment 3) FIG. 5 is a schematic perspective view showing Embodiment 3, and FIG. 6 is an exploded perspective view of the inductor shown in FIG. In the present embodiment, the inductance of the edgewise coil 3 is improved. Base 1
The edgewise coil 3 whose ends are fixed to the terminals 2 and 2 provided on the base 1 is sandwiched between an ER core 7 and a flat I-core 8 described later. In FIGS. 4 and 5, portions corresponding to those shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

The base 1 has a circular through hole 15 coaxial with the center axis of the edgewise coil 3 and having substantially the same diameter as the inner diameter of the edgewise coil 3. ER mentioned above
The core 7 has a depth dimension slightly shorter than the dimension between the biconvex portions 11 of the base 1 described above.
It has a shape in which a columnar body is provided at the center of a right-angled groove-shaped body having an inner width slightly longer than the dimension in the direction perpendicular to the direction between 11, and is made of soft material such as NiZn-based or MnZn-based ferrite or metal dust. A magnetic material is used. The I core 8 has a flat plate shape having the same dimensions as the ER core 7 out of plane method, and is made of the same soft magnetic material as the ER core 7. In addition,
In the present embodiment, the case where the I-core 8 and the ER-core 7 are combined has been described.
It goes without saying that two ER cores may be arranged so that the central legs face each other.

The cylindrical center leg 18 of the ER core 7 has a base 1
In the through hole 15 and the edgewise coil 3 provided in this order. At this time, the biconvex portions 11 of the base 1
11 is fitted on the ER core 7, and the bottom surfaces of the two convex portions 11, 11 and the back surface of the ER core 7 are substantially flush. In addition, the position of the upper surface of the central leg 18 and the side legs 17, 17 on both sides of the central leg 18,
It is higher than the position of the upper surface of the edgewise coil 3. And
The I-core 8 is fixedly abutted on the center leg 18 and the side legs 17,17. An insulating sheet (not shown) is interposed between the upper surface of the edgewise coil 3 and the I-core 8. Thereby, the magnetic flux leakage from the edgewise coil 3 is reduced, and the inductance of the edgewise coil 3 is improved.

[0033]

As described in detail above, in the inductor according to the first aspect of the present invention, a terminal component having high dimensional accuracy can be attached to the substrate, and thus the flatness of the inductor is high.
Further, since the end of the edgewise coil is connected to the terminal component, the thickness of the edgewise coil hardly affects the flatness of the inductor. Therefore, regardless of the thickness of the edgewise coil, it is possible to prevent a variation in height among a plurality of inductors, and to reduce the height of the inductor as much as possible.

In the inductor according to the second aspect of the invention, since the U-shaped terminal component is fitted around the edge of the plate-shaped substrate, the terminal component can be easily attached to the substrate. .

In the inductor according to the third aspect of the invention, the positioning when attaching the terminal component to the substrate is easy, and the height of the inductor can be made as low as possible.

In the inductor according to the fourth aspect, the work of fixing the terminal component to the substrate can be performed quickly and reliably.

[0037] In the inductor according to the fifth aspect of the invention, it is possible to quickly perform positioning when the terminal component of the edgewise coil is connected to the terminal component.

In the inductor according to the sixth aspect, the work of fixing the end of the edgewise coil to the terminal component can be quickly performed.

In the inductor according to the seventh aspect of the present invention, the present invention has excellent effects, for example, the amount of leakage magnetic flux from the edgewise coil is reduced and the inductance of the edgewise coil is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an inductor according to the present invention.

FIG. 2 is an exploded perspective view of a base and terminals shown in FIG.

FIG. 3 is a schematic perspective view showing a second embodiment.

FIG. 4 is an explanatory view illustrating a method of assembling the inductor shown in FIG. 3;

FIG. 5 is a schematic perspective view showing a third embodiment.

6 is an exploded perspective view of the inductor shown in FIG.

FIG. 7 is a perspective view showing an edgewise coil.

FIG. 8 is a perspective view showing a conventional choke inductor having an edgewise coil.

[Explanation of symbols]

 Reference Signs List 1 base 2 terminal 3 edgewise coil 7 ER core 8 I core 11 convex part 12 cutout 13 rectangular concave part 14 hole 15 through hole 21 fixing rib 22 positioning rib 23 fixing rib

Claims (7)

[Claims] 1. An inductor in which an edgewise coil is supported by a substrate made of an insulating material, wherein at least two terminal parts are provided on the substrate, and both end parts of the edgewise coil are separately connected to both terminal parts. An inductor. 2. The inductor according to claim 1, wherein the two terminal components are formed in a U-shape, and the two terminal components are externally fitted to an edge of the substrate. 3. A concave portion is provided on a surface of the substrate opposite to a surface supporting the edgewise coil and opposed to both terminal components, and both terminal components are provided in both concave portions. 3. The inductor according to claim 2, which is fitted. 4. A hole is provided in each of the recesses,
A fixing tongue piece is provided at a portion of each of the terminal parts facing the hole, and each of the terminal parts is fixed to the substrate by bending each fixing tongue piece into a corresponding hole. 3. The inductor according to 3. 5. A terminal for connecting an end of an edgewise coil of the terminal component, two positioning ribs for adjusting a connection position are separated by a size substantially the same as the width of the end of the edgewise coil. The inductor according to any one of claims 1 to 4, wherein the end of the edgewise coil is fitted between the two positioning ribs. 6. A fixing rib for fixing an end portion of an edgewise coil is provided on the terminal component so as to intersect a line connecting the two positioning ribs, and the fixing rib is folded. 6. The inductor according to claim 5, wherein the edge of the edgewise coil fitted between the positioning ribs is fixed by bending. 7. The edgewise coil is supported by the substrate so that a center axis intersects the substrate, and a through hole penetrating the substrate is provided in a portion of the substrate facing a portion surrounded by an inner peripheral edge of the edgewise coil. The inductor according to any one of claims 1 to 6, wherein a center leg of a three-leg core is inserted into the through hole and the edgewise coil.