JP2003068531A - Inductor, and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inductor of a high tolerable current, a high L value, and low noise which can constitute closed magnetic circuit structure being low in height, small in size, and little in leaked magnetic flux while materializing the cost down by reducing the number of constituting parts and the number of manufacture processes. SOLUTION: A drum core 2, has a bobbin 7 and upper flanges 8 and 9 molded integrally at both its ends and where a coil is made by winding a lead wire covered with polyurethane. The care is fixed within the recess of a cover where electrodes 3 are made outside of both ends and which has a recess capable of storage of the drum core 2 at the center, being covered so that it may be positioned and stored, and the lead wires 5 led out of the ends of the covered lead wires are connected to the electrodes 3 through the concave groove 4 made on both sides of the recesses of the cover 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inductor which can be surface-mounted on a wiring board of an electronic circuit and a method for manufacturing the inductor, and more particularly to a small and low-profile inductor and a method for manufacturing the inductor. is there.

[0002]

2. Description of the Related Art In a conventional low-height inductor of this type, for example, as shown in FIG. 25, a coil 6 is wound around a drum core 2 and fixed to a pedestal 12 made of synthetic resin together with a cover ring 10 to provide a connecting electrode. It was manufactured by

Alternatively, Japanese Patent Laid-Open No. 9-153 shown in FIG.
Like the inverter transformer described in Japanese Patent No. 418,
At least two opposite side surfaces of the lower collar 33 are provided with extension portions 33a projecting more laterally than the upper collar 31, and projecting portions 52 are formed at positions on the lower surface of the core 50 facing the extension portions 33a.
The core 30 made of a magnetic material in which the extension portion 33a and the protruding portion 52 are butted against each other is positioned and fixed on the base 10 on which the plurality of terminals 20 are implanted.

[0004]

However, in the conventional inductor, the pedestal and the base for fixing the cover ring for forming the closed magnetic structure are required, and it is difficult to realize the low profile type.

Further, in order to dispose the terminals on the base, the strength and thickness of the base are required, which makes it difficult to realize a low profile type.

As described above, the number of parts is large, and the lead wire processing, the terminal forming processing, and the positioning are complicated, and there is a problem of strength between the pedestal and the base. The number of steps was also increasing.

[0007]

The present invention has been made for the purpose of solving the above-mentioned problems.
The reliability of lead wire processing is improved while reducing the number of parts and the number of manufacturing steps to realize cost reduction, and it is possible to configure a closed magnetic circuit structure that is low in height, small in size, and has less leakage flux, and has a high allowable current and high L An object of the present invention is to provide an inductor and a method for manufacturing the inductor, which can obtain an inductor having a low value and a low noise. Then, for example, the following configuration is provided as one means for achieving the object and solving the problems described above.

That is, a drum core 2 having upper and lower flanges 8 and 9 integrally formed on both side surfaces, a coil 6 wound between the upper and lower flanges 8 and 9 of the drum core 2, and the drum core 2 A cover portion 1 having a storage portion capable of positioning and storing; an electrode 3 formed of a conductive material at least from the end portion of the cover 1 on the substrate mounting surface to both side surfaces; and the end portion of the coil 6 and the electrode 3 are connected. And a lead wire 5 that

And, for example, the storage portion of the cover 1 is
It is characterized in that it is a concave portion capable of positioning and accommodating the drum core 2. Alternatively, it is characterized in that the cover 1 having an adhesive applied to the bottom of the recess is covered and positioned and fixed on the drum core 2 in the recess. Alternatively, the storage portion of the cover 1 is a hole portion capable of positioning and storing the drum core 2.

Further, for example, a concave groove for positioning and leading the lead wire to the position of the electrode 3 is provided on the side surface of the cover 1 where the electrode is provided, and the concave groove is inclined at a predetermined angle with respect to the upright direction. It is characterized by being

Further, for example, a recessed groove for positioning and leading the lead wire to the position of the electrode 3 is provided on the side surface of the cover 1 on the side where the electrode 3 is disposed, and the groove is a side surface on which the electrode 3 of the storage section is disposed. It is characterized in that it is a notch from the side to the site where the electrode 3 is provided. Alternatively, a recessed groove for positioning and leading the lead wire to the position of the electrode 3 is provided on the side surface of the cover 1 on the side where the electrode is provided, and the recessed groove has a predetermined width.

Further, for example, a concave groove for positioning and leading the lead wire to the position of the electrode 3 is provided on a side surface of the cover 1 on which the electrode is provided, and the concave groove is a substantially V-shaped groove. And Alternatively, a groove for positioning and leading the lead wire to the position of the electrode 3 is provided on the side surface of the housing of the cover 1 where the electrode is provided, and the groove is located at a portion rising from the lowermost end of the housing by a predetermined distance. It is characterized in that it is a cutout up to the site where the electrode 3 is provided.

Further, for example, a concave groove for positioning and leading out the lead wire to the position of the electrode 3 is provided on the side surface of the drum core 2 on which the electrode is arranged when the upper and lower flanges 8 and 9 are accommodated in the accommodating portion of the cover 1. It is characterized by

Further, for example, the upper flange 8 of the drum core 2 is formed to have a diameter larger than that of the lower flange 9, and the accommodating portion of the cover 1 has a notch portion having substantially the same thickness as the upper flange 8 of the drum core 2 and the upper flange. It is characterized in that the coil 6 portion except 8 and the lower collar 9 portion are constituted by holes capable of positioning and accommodating.

Further, for example, an adhesive is applied to the contact surface of the upper flange 8 of the cutout portion, and the drum core 2 is applied to the adhesive application portion.
It is characterized in that the coil surface of the upper flange 8 is brought into contact with and fixedly positioned.

Further, for example, the electrode 3 is formed by forming a conductive paste layer by sputtering, metal plate, or baking after dipping and plating.

Further, for example, the lead wire 5 is connected to the cover 1
It is characterized in that it is connected to the electrodes 3 provided at both ends thereof by thermocompression bonding, soldering, a conductive adhesive, or welding.

A coil 6 is formed by winding a conductive wire between the upper and lower flanges 9 of the drum core 2 having the upper and lower flanges 9 integrally formed on both sides to form a coil 6. A cover made of a magnetic material, which has a magnetically shielded drum core 2 and has an accommodating portion capable of positioning and accommodating the drum core 2 and at least an electrode 3 made of a conductive material extending from the end of the board mounting surface to both sides thereof. It is manufactured by a method of manufacturing an inductor, which is housed in the housing part of the part 1 and the end of the coil 6 and the electrode 3 are connected by a lead wire 5.

DETAILED DESCRIPTION OF THE INVENTION Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[First Embodiment] FIG. 1 is a plan view of an inductor according to an embodiment of the present invention, FIG. 2 is a front sectional view of the inductor according to the present embodiment, and FIG. FIG. 4 is a side sectional view of the inductor of the present embodiment, and FIG. 4 is an exploded perspective view of the inductor of the present embodiment.

In the figure, reference numeral 1 denotes a cover formed by a magnetic shielding material having a concave shape capable of positioning and accommodating the drum core 2 such as ferrite, which is close to the upper flange 8 and the lower flange 9 of the drum core 2, and 2 is wound. The drum core is formed of the same magnetically shielding material as the cover 1 having the upper collar 8 and the lower collar 9 integrally formed on both ends of the shaft 7 and the winding shaft 7, for example, ferrite. In the present embodiment, the drum core 2
After being wound, this is adhered and fixed in the recess formed in the cover 1 by the heat resistant adhesive 13.

Reference numeral 3 denotes an electrode formed from the outer wall surfaces of both ends of the cover 1 above and below the cover 1. The electrode 3 is formed in a U-shaped cross section in the example of FIG. 5 is electrically connected to the opening surface side of the recess of the cover 1 of the electrode 3. Reference numeral 4 denotes a concave groove formed on the side surface of the drum core 2 on the side where the concave electrode is provided, through which a lead wire 5 at the end of the coil 6 passes, and also serves to prevent displacement of the lead wire 5 of the coil 6.

Reference numeral 5 is a lead wire extending from the end of the polyurethane-coated conductive wire forming the coil 6, and is electrically connected to the electrodes 3 at both ends through thermocompression bonding through the groove 4 of the cover 1 by, for example, sputtering. Has been maintained.
Reference numeral 6 denotes a coil formed by winding a conductive wire, for example, a polyurethane-coated conductive wire, between the upper flange 8 and the lower flange 9 of the drum core 2.

In this embodiment, the drum core 2
The upper flange 8 and the lower flange 9 and the concave inner diameter of the cover 1 are formed so as to be close to each other as shown in FIGS. 1 to 3. The depth of the concave portion is formed slightly deeper than the thickness of the drum core 2, and the drum core 2 is fixed to the concave portion of the cover 1 with an adhesive.
Even if the bottom is thinly formed, sufficient strength can be secured.

Further, since the cover 1 and the drum core 2 are made of ferrite which is a magnetic shielding material, they have a magnetic force shielding structure, and it is possible to suppress the release of the magnetic force generating lines generated in the coil 6 to the outside. .

Moreover, the cover 1 is provided with the concave groove 4 for electrically connecting the end portion of the coil 6 and the winding of the electrode 3. The concave groove 4 has a predetermined width which is inclined from the bottom of the side surface of the concave portion of the cover 1 on the side where the electrode is provided to the end portion where the electrode 3 is provided to a portion that is substantially raised by the thickness of the lower flange 9 of the drum core 2. Is the groove.

The lead wire 6 which is the output end from the coil 6
Is placed in the opening from both sides of the cover 1, the opening is on the substrate side when mounted on the substrate, and the electrode portion on the opening side comes into contact with the substrate pattern.

Therefore, it is possible to connect to the substrate pattern without receiving the base portion for forming the electrodes as in the conventional case. As a result, there is no need for a special configuration in the thickness direction for forming the electrodes, and it can be neglected, which is about the thickness of the electrode 3. Further, since the bottom portion and the side surface portion are integrally molded, the magnetic field shielding effect is high and the height can be made low.

A method of manufacturing the inductor of the present embodiment having the above configuration will be described below with reference to the flowchart of FIG. FIG. 5 is a flow chart for explaining an example of the method for manufacturing the inductor according to the present embodiment.

In the present embodiment, the drum core 2 and the cover 1 are molded before assembling a specific inductor. Then, after that, the coil 6 is formed on the drum core 2 and the electrode 3 is formed on the cover 1.

Therefore, first in step S1, the drum core 2 having the winding shaft 7 and the upper and lower flanges 8 and 9 integrally formed at both ends of the winding shaft 7 is formed by using a magnetic shielding material such as ferrite.

Then, in the subsequent step S2, for example, a polyurethane-coated conductive wire is wound around the winding shaft 7 between the upper flange 8 and the lower flange 9 of the drum core 2 formed in step S1 to form the coil 6. Both ends of the polyurethane-coated conductor are lead wires 5
As a predetermined length is extended from the drum core 2.

Further, as shown in step S3, the cover 1 in which the concave portions and the concave grooves 4 having the shapes shown in FIGS. 1 to 4 are formed by a magnetic shielding material such as ferrite is manufactured by molding. That is, the cover 1 is manufactured as a ferrite-mixed resin molded product. The recess and the groove 4 may be formed by grinding or the like.

Next, in step S4, a metal film is formed by, for example, sputtering on the electrode disposition portion of the side surface end portion where the concave groove 4 is formed, and the surface of the metal film is plated to improve the durability and the electrode 3 To form. This completes the production of the cover 1 and the production of inductor manufacturing parts.

In the above description, an example in which the drum core 2 is manufactured in steps S1 and S2 and the cover 1 is manufactured in steps S3 and S4 has been described.
The drum core 2 and the cover 1 can be independently manufactured at different places, and it does not matter before or after manufacturing.

For example, step S1 and step S3 may be performed respectively, or only the cover molding in step S1 and step S3 may be performed first, and then the recess and groove 4 may be molded, and then the coil is assembled. You can go.

As described above, the cover 1 and the drum core 2
4 is prepared, the heat resistant adhesive 13 is applied to the central portion of the bottom surface of the concave portion of the cover 1 in step S5 as shown in FIG. The application range of the heat-resistant adhesive 13 is set to, for example, at least the winding shaft 7 portion of the drum core 2 so that the strength for securely positioning and fixing the drum core 2 in the recess of the cover 1 can be secured.

At the subsequent step S7, the end of the lead wire 5 extending from the groove 4 to the surface of the electrode 3 is positioned so as to extend above the electrode 3, and at least the contact portion of the electrode 3 is stripped off to cover the electrode 3 and the lead. The wire 5 is thermocompression bonded to be electrically connected. Then, if necessary, the lead wire 5 extending from the connection portion with the electrode 3 is cut and removed to complete the inductor of the present embodiment.

FIG. 6 shows the inductor of the present embodiment manufactured by the above steps. FIG. 6 is a completed perspective view of the inductor according to the present embodiment.

In the inductor of this embodiment manufactured as described above, for example, the drum core 2 has a thickness of about 1.2 mm to 1.5 mm, a diameter of about 3 mm to 6 mm, and the cover 1 has a diameter of about 3 mm to 6 mm. The depth of the recess is about 1.2 mm to 1.5 m
m, diameter of about 5 mm to 10 mm, cover, that is, the outer shape of the inductor, the total thickness is about 2 mm or less, the longitudinal direction is about 10 m.
A small inductor having a length of m or less and a width of about 8 mm or less can be obtained.

As described above, according to the present embodiment, the winding shaft 7 and the upper collar 8 of the same shape integrally formed on both ends thereof.
A coil 6 is formed by winding a polyurethane-coated conductive wire around the drum core 2 having the lower collar 9 and the lower collar 9, and the drum core 2 can be positioned close to the upper collar 8 and the lower collar 9 of the drum core 2 on which the coil 6 is formed. Since the inductor 1 has a structure in which the ferrite cover 1 having the recesses is covered over the drum core 2, the reliability of lead wire processing can be reduced while reducing the number of components and the number of manufacturing steps to achieve cost reduction. In addition, it is possible to obtain an inductor having a high allowable current, a high L value and a low noise by a closed magnetic circuit structure having a low profile, a small size, and a small leakage flux.

Since the opening side of the cover 1 is electrically connected to the pattern arranged on the substrate when the substrate is mounted, the outer side is completely covered with the cover 1 when the substrate is mounted. It is possible to obtain a high magnetic shield effect.

[Second Embodiment] In the first embodiment described above, when forming the electrode 3 in step S4, the electrode 3 was formed by sputtering.

However, the formation of the electrode 3 is not limited to the above example, and Ag / P is formed by firing after dipping.
The electrode 3 may be formed by forming d into an electrode shape and then plating the surface.

By controlling in this way, it is possible to provide an excellent inductor similar to that of the first embodiment with a simple manufacturing process and manufacturing equipment.

[Third Embodiment] In the first embodiment described above, the electrode 3 was formed by sputtering when forming the electrode 3 in step S4.

However, the formation of the electrode 3 is not limited to the above example, and the cover member is formed by resin molding or the like, and the electrode forming portions on both side surfaces are covered with metal plates to form a substantially U-shaped section. Then, the electrode 3 may be formed by being fixed to the cover 1 with a heat-resistant adhesive or the like, or by being fused.

Alternatively, a metal layer having a predetermined thickness is formed on the surface of the cover member, and the metal layer is removed except for the electrode portion,
The cover 1 may be molded by forming a recess or the like.

By controlling in this way, it is possible to provide an excellent inductor similar to that of the first embodiment or the second embodiment. Also in this case, [Fourth Embodiment] In the first embodiment described above, when forming the electrode 3 in step S4, the electrode 3 was formed by sputtering.

However, the formation of the electrode 3 is not limited to the above example, and the cover member may be formed by resin molding, and the metal electrodes may be disposed by insert molding on both ends of the resin molded cover member. . Yes.

By controlling in this way, it is possible to provide the same excellent inductors as those of the first to third embodiments.

[Fifth Embodiment] In the embodiment described above, when the lead wire 5 and the electrode 3 are connected in step S7, the lead wire 5 is passed through the concave groove 4 of the cover 1. The electrode 5 was positioned at both ends of the electrode 3 and the lead wire 5 was thermocompression bonded to the electrode 3 by sputtering or the like to maintain an electrically conductive state.

However, the connection between the lead wire 5 and the electrode 3 is not limited to the above example, and the lead wire 5 from the coil 6 wound around the drum core 2 is passed through the recessed groove 4 of the cover 1 at both ends. It may be positioned at the electrode 3 portion of the above, and may be fixed to the electrode 3 by soldering and maintained in an electrically conductive state.

By controlling in this way, it is possible to provide the same excellent inductor as that of the above-mentioned embodiment with a simple manufacturing process and manufacturing equipment.

[Sixth Embodiment] In the embodiment described above, when the lead wire 5 and the electrode 3 are connected, the lead wire 5 is passed through the concave groove 4 of the cover 1 and The electrode 3 was positioned and thermocompression bonded or soldered to maintain the electrical continuity.

However, the connection between the lead wire 5 and the electrode 3 is not limited to the above example, and the lead wire 5 and the electrode 3 are connected.
When connecting the lead wire 5 to the electrode 3 at both ends through the groove 4 of the cover 1, the lead wire 5 and the electrode 3 are bonded with, for example, a conductive adhesive to electrically connect them. Can be maintained in a state.

By controlling in this way, it is possible to provide the same excellent inductor as that of the above-mentioned embodiment by a simple manufacturing process and manufacturing equipment. Furthermore, a reliable connection between the electrode 3 and the lead wire 5 can be secured regardless of the skill level, and an excellent inductor with less variation can be provided.

[Seventh Embodiment] In the embodiment described above, when the lead wire 5 and the electrode 3 are connected in step S7, the lead wire 5 is thermocompression-bonded to the electrode 3 and soldered. They were attached or connected with an adhesive to maintain an electrically conductive state.

However, the connection between the lead wire 5 and the electrode 3 is not limited to the above example, and the lead wire 5 and the electrode 3 are connected.
When connecting with the lead wire 5, the lead wire 5 can be positioned at the electrode 3 portions at both ends through the concave groove 4 of the cover 1, and for example, the lead wire 5 and the electrode 3 can be welded to maintain an electrically conductive state. it can.

By controlling in this way, an excellent inductor similar to that of the first embodiment can be provided, and the lead wire 5 and the electrode 3 can be connected securely and firmly.

[Eighth Embodiment] In the embodiment described above, in the molding of the cover 1 in step S3, the recessed groove 4 is formed from the bottom of the recessed portion of the cover 1 on the side where the electrode is provided. The lower core 9 of the drum core 2 is formed by inclining at an angle connecting the portion rising from the thickness of the lower brim 9 to the end portion where the electrode 3 is arranged, and the width of the concave groove 4 is about half of the width of the concave side surface of the cover 1. there were.

However, the shape of the concave groove 5 is not limited to the above example, and the inclination angle may be formed at an arbitrary angle of 0 to 90 degrees with respect to the upright direction. In this case, for example, the recessed groove 5 inclined at a desired angle with respect to the disposition end of the electrode 3 may be formed, and the boundary portion between the recessed portion and the recessed groove 5 may be determined according to the inclination angle.

Even in this case, it is possible to reliably guide the positioning of the lead wire 5.

[Ninth Embodiment] Although a sufficient working effect can be achieved by the formation example of the concave groove 5 of the eighth embodiment described above, a more concrete formation example of the concave groove 5 Will be shown below as a ninth embodiment of the present invention.

For example, in the first embodiment, the groove 4
1 was about half the width of the side surface of the recess of the cover 1 as shown in FIG. However, the present invention is not limited to the above example, and even if the width is wider, the lead wire 5 can be maintained in a good state when the inductor is small.

For example, as shown in FIG. 7, the width of the opening of the recessed groove 4 to the recess may be formed to be substantially the same as the width of the recess. FIG. 7 is a cover 1 according to a ninth embodiment of the present invention.
FIG. 6 is a perspective view of a cover for explaining a molding example of FIG.

By adopting the concave groove shape of the ninth embodiment, even if the lead wire 5 extending position from the coil 6 wound around the drum core 2 varies, no special process is performed. It is possible to easily and surely position and lead out to the position of the electrode 3.

Further, it is possible to provide a highly reliable inductor in which the concave groove 4 and the lead wire 5 do not come into contact with each other at an unreasonable angle, and the lead wire 5 is not broken.

[Tenth Embodiment] The concave groove 5 of the first or ninth embodiment described above is the cover 1
An example has been described in which the groove having a predetermined width is connected from the bottom portion of the side surface of the concave portion of the electrode where the electrode is provided to approximately the thickness of the lower flange 9 of the drum core to the end portion where the electrode 3 is provided. .

However, the present invention is not limited to the above example, and the lead wire 5 can be maintained in a good state even if the inclination angle is 90 degrees as described in the eighth embodiment.

For example, as shown in FIG. 8, the lower flange 9 of the drum core 2 is located substantially below the bottom of the recessed portion of the cover 1 on the side where the electrodes are provided.
It is also possible to form a groove having the same depth from the portion rising up to the thickness of 1 to the end portion where the electrode 3 is provided. FIG. 8 is a perspective view of a cover for explaining a molding example of the cover 1 according to the tenth embodiment of the present invention.

By forming the groove shape of the tenth embodiment, it is possible to prevent the lead wire 5 from the coil 6 wound around the drum core 2 from coming into contact with other wall surfaces up to the position of the electrode 3. It is possible to easily and reliably position and lead to the position of the electrode 3 without performing a special process.

Also in this case, it is possible to effectively prevent the lead wire 5 from coming into contact with the other surface of the case 1 up to the electrode 3 and to prevent the lead wire 5 from being broken, thereby providing a highly reliable inductor. it can.

[Eleventh Embodiment] The groove 5 of the embodiment described above has a certain width from the bottom of the side surface of the recess of the cover 1 on the side where the electrodes are disposed to the position of the electrode 3. . However, the present invention is not limited to the above example, and when the variation in the extension position of the lead wire 5 is small, it is possible to obtain a good lead wire 5 without providing the groove 4 with much width.
The positioning function can be demonstrated.

For example, as shown in FIG. 9, a portion where the extending portion of the lead wire 5 on the bottom of the side surface of the cover 1 where the electrode is disposed and the electrode 3 and the connecting end portion of the lead wire 5 are linearly connected. The concave groove 4 may be formed by removing the concave side surface of the cover 1 on the side where the electrode 3 is provided. FIG. 9 is a perspective view of a cover for explaining a molding example of the cover 1 according to the eleventh embodiment of the present invention.

About V of the eleventh embodiment shown in FIG.
By forming the V-shaped groove, the wiring from the coil 6 wound around the drum core 2 to the position of the electrode 3 of the lead wire 5 is accurately positioned at a specific position, so that the lead wire 5 is formed after the inductor is completed. Since the lead wire 5 is positioned and disposed at the bottom of the groove 4, it is possible to provide a highly reliable inductor in which the lead wire 5 is less likely to vibrate due to vibration or the like.

[Twelfth Embodiment] The recessed groove 5 of the above-described embodiment is approximately the thickness of the lower flange 9 of the drum core 2 from the bottom of the side surface of the recess of the cover 1 on which the electrodes are disposed. An example in which the electrode 3 is formed from the rising portion to the end portion where the electrode 3 is disposed has been described.

However, the present invention is not limited to the above example, and the electrode 3 is provided at the end portion from the bottom of the recess without providing the rising portion from the bottom of the side surface of the cover 1 where the electrode is provided. May be formed.

For example, as in the case of the first embodiment shown in FIG. 4, the electrode 3 is arranged from the portion of the recess of the cover 1 which is raised from the bottom of the side surface on which the electrode is provided to substantially the thickness of the lower flange 9 of the drum core 2. Instead of forming a concave groove inclined to the installation end portion, as shown in FIG. 10, the electrode 3 is arranged from the bottom of the concave portion without forming a rising portion from the bottom of the side surface of the concave portion of the cover on which the electrode is arranged. You may form even an edge part. Figure 10
[FIG. 22] is a perspective view of a cover for explaining a molding example of the cover 1 according to the twelfth embodiment of the present invention.

By forming the groove shape of the twelfth embodiment, it becomes easy to process the groove 4 or to manufacture the forming die. Also in this case, like the first embodiment, it is possible to prevent the lead wire 5 from the coil 6 wound around the drum core 2 from coming into contact with another wall surface up to the position of the electrode 3 and to reliably position the electrode 3. It is possible to provide a highly reliable inductor that can be positioned and led to.

[Thirteenth Embodiment] As shown in FIG. 10, the width of the groove 4 from the bottom of the side surface of the recess of the cover 1 according to the twelfth embodiment described above on the side where the electrodes are provided is as shown in FIG. 1
It was about half the width of the side surface of the recess. However, the present invention is not limited to the above example, and even if the width is wider, the lead wire 5 can be maintained in a good state when the inductor is small as in the ninth embodiment. it can.

For example, as shown in FIG. 11, the width of the opening of the concave groove 4 to the concave portion may be formed to be substantially the same as the width of the concave portion. FIG. 11 is a perspective view of a cover for explaining a molding example of the cover 1 according to the thirteenth embodiment of the present invention.

The groove shape of the eleventh embodiment facilitates formation of the groove 4 even if the lead wire 5 extending from the coil 6 wound around the drum core 2 varies. At the same time, it is possible to easily and reliably position and lead to the electrode 3 position without performing a special process.

Further, as in the ninth embodiment, the concave groove 4 is formed.
It is possible to provide a highly reliable inductor in which the lead wire 5 does not come into contact with the lead wire 5 at an unreasonable angle, and the lead wire 5 does not break.

[Fourteenth Embodiment] The recessed groove 5 of the twelfth and thirteenth embodiments described above is arranged such that the electrode 3 is provided at an end where the electrode 3 is provided from the bottom of the side surface of the recess of the cover 1 where the electrode is provided. The example has been described in which the groove is a groove having a predetermined width and connected up to the partial portion and inclined at an angle.

However, the present invention is not limited to the above example, and the inclination angle is formed in the groove having the same depth up to the end portion where the electrode 3 is disposed as in the tenth embodiment. Can maintain the lead wire 5 in a good state.

For example, as shown in FIG. 12, a groove having the same depth may be formed from the bottom of the side surface of the cover 1 where the electrode is provided to the end portion where the electrode 3 is provided. FIG. 12 is a perspective view of a cover for explaining a molding example of the cover 1 according to the fourteenth embodiment of the present invention.

By adopting the concave groove shape of the fourteenth embodiment, the drum core 2 can be formed similarly to the tenth embodiment.
It is possible to prevent the lead wire 5 from the coil 6 wound around the wall from coming into contact with other wall surfaces up to the position of the electrode 3 and to facilitate the formation of the concave groove 4 and to easily and surely perform no special process. The electrode 3 can be positioned and led to the position.

Also in this case, it is possible to effectively prevent the lead wire 5 from coming into contact with the other surface of the case 1 up to the electrode 3, and to provide a highly reliable inductor in which the lead wire 5 is not broken. it can.

[Fifteenth Embodiment] The concave groove 5 of the above-described embodiment has a certain width from the bottom of the side surface of the concave portion of the cover 1 on the electrode arrangement side to the position of the electrode 3. . However, the present invention is not limited to the above example, and the width of the recessed groove 4 is not provided so much when the variation in the extending position of the lead wire 5 is small as in the eleventh embodiment. However, a good lead wire 5 positioning function can be exhibited.

For example, as shown in FIG. 13, the electrode 3 of the cover 1 is disposed up to a portion where the bottom of the side surface of the recess of the cover 1 on which the electrode is disposed and the electrode 3 and the connecting end position of the lead wire 5 are linearly connected. The side surface of the side concave portion may be removed to form the V-shaped concave groove 4. FIG. 13 is a perspective view of a cover for explaining a molding example of the cover 1 according to the fifteenth embodiment of the present invention.

By forming a substantially V-shaped groove as shown in FIG. 13 of the fifteenth embodiment, wiring from the coil 6 wound around the drum core 2 to the electrode 3 position of the lead wire 5 can be performed. Since the lead wire 5 is accurately positioned at a specific position, the lead wire 5 is positioned and disposed at the bottom of the groove 4 after the inductor is completed. Therefore, the lead wire 5 is less likely to vibrate due to vibration or the like, and is a highly reliable inductor. Can be provided.

[Sixteenth Embodiment] The coil 6 of the above-described embodiment is formed by winding, for example, a polyurethane-coated conductive wire between the upper and lower flanges 8 and 9 of the drum core 2. Explained. The winding method of this coil is not particularly limited, but it may be constituted by a coil having a normal winding in which the conductor wire is gradually wound outward from the center shown in FIG.

However, the present invention is not limited to the above examples, and the drum core 2 having the winding shaft 7 and the upper and lower flanges 8 and 9 of the same shape integrally formed on both ends of the winding shaft 7 is provided with a polyurethane-coated conductive wire. The coil 6 is wound around the winding structure shown in FIG. 14B so that both ends of the wound wire are located on the outer circumference of the winding (winding in the α winding structure). Good. FIG. 14: is a figure for demonstrating the winding structure example of the coil 6 of the 16th Embodiment of this invention.

As in the sixteenth embodiment, the coil is shown in FIG.
By adopting the α winding structure shown in FIG. 4 (B), a specific load is applied to the conductor wire forming the coil by forcibly crossing other winding parts as shown in FIG. 14 (A). It is possible to form a coil having good characteristics in which the lead wire extends from the outer peripheral portion of the winding, and to provide a high-performance and highly-reliable inductor.

According to the embodiments described above, the number of parts is small, so that the cost can be reduced, the reliability of the lead wire processing of the coil due to the concave groove shape is increased, the height is extremely low and the size is small. Moreover, a closed magnetic circuit structure with little leakage flux can be constructed, a high allowable current and a high L value can be realized, and a low noise inductor can be obtained.

For example, in the drum core 2 having the winding shaft 7 and the upper and lower flanges 8 and 9 of the same shape integrally formed on both ends thereof,
A coil 6 is formed by winding a polyurethane-coated conductive wire, and is made of a ferrite material having a concave portion formed in the vicinity of the upper flange 8 and the lower flange 9 of the drum core 2 on which the coil 6 is formed so that the drum core 2 can be positioned. Since the cover 1 is an inductor having a structure that is covered over the drum core 2, the number of component configurations and the number of manufacturing processes are reduced to realize cost reduction while improving the reliability of lead wire processing. Moreover, a closed magnetic circuit structure with little leakage magnetic flux makes it possible to obtain an inductor with a high allowable current, a high L value and low noise. Also, by having the positioning groove 5 for connecting the lead wire 5 to the electrode 3, a low profile is achieved. Moreover, even if the size is reduced, the lead wire is prevented from rising and the connection state with the highly reliable electrode can be maintained.

Further, since the upper collar 8 and the lower collar 9 of the drum core 2 and the concave inner diameter of the ferrite cover 1 are arranged close to each other, a high L value can be simultaneously achieved while suppressing leakage flux.

[Seventeenth Embodiment] In the embodiment described above, the electrode 3 has a substantially U-shaped cross section and is arranged on both side surfaces of the cover 1.
However, the present invention is not limited to the above examples,
The present invention is not limited to the above examples as long as it can be surely connected to the pattern arranged on the substrate when it is mounted on the substrate and can be surely connected to the coil lead wire.

Further, the structure of the cover 1 is not limited to the embodiment described above, and is not limited to the above example as long as the magnetic force generated from the inductor can be surely prevented from diffusing. . Further, even if the thickness of the cover 1 and the thickness of the drum core 2 are punched out in the shape of a core instead of a recess to make the thickness thereof substantially the same in order to obtain a low profile, substantially the same operational effects as those of the above-described embodiments can be achieved.

A seventeenth embodiment of the present invention in which the structure of the cover portion and the structure of the electrodes are changed will be described below with reference to FIGS. 15 to 22. 15 is an exploded perspective view of a seventeenth embodiment according to the present invention, FIG. 16 is an assembled perspective view of the seventeenth embodiment, and FIG. 17 is a plan view of the seventeenth embodiment. 18 is a front view of the seventeenth embodiment, FIG. 19 is a bottom view of the seventeenth embodiment, FIG. 20 is a side view of the seventeenth embodiment, and FIG. 21 is the seventeenth embodiment. FIG. 17A-A cross-sectional view of the example, and FIG. 22 is a cross-sectional view of the seventeenth embodiment of FIG. 17B-B plane.

In the seventeenth embodiment, the shape of the cover portion and the shape of the drum core are different from those of the above-mentioned embodiments. The drum core 2 of the seventeenth embodiment is
As is apparent from FIGS. 15, 21, and 22, the upper flange 8 of the drum core 2 is formed to have a large diameter that is substantially the same as the width in the short-side direction of the cover 1, and the lower flange 9 is formed to be smaller than the upper flange 8. is doing.
Then, when the drum coil 2 is fixed to the cover 1, the concave groove 4 is formed at the positions of the upper flange 8 and the lower flange 9 which are the end portions on the electrode side, and the lead wire 5 is arranged in the concave groove 4 for easy positioning wiring. Has been done.

Further, a notch is formed in the central portion of the cover 1 at a depth approximately the same as the thickness of the upper collar 8, and a hole having a diameter slightly larger than the outer diameter of the lower collar 9 is formed in the central portion following the notch. To form.

Further, the electrode 3 having an L-shaped cross section is formed from the large-diameter opening side of the hole on both side surfaces of the cover 1 to both side surfaces. The electrode 3 is formed on the side surface side of the cover 1 so as to be up to about half the thickness of the cover 1. The electrode 3 is
For example, the side edges of the ferrite cover 1 are formed by dipping and firing to form Ag / Pd and plating.

The electrode 3 is not limited to the case of being formed by this method, and even if it is formed in the same step as the pattern forming step of the substrate, the metal foil (metal plate) is preliminarily processed to form a heat resistant adhesive. It may be fixed to the cover 1 with an agent, and the forming method is not limited.

In the inductor manufacturing process, the drum core 2 having the above-described shape is manufactured, and the wire made of the polyurethane-coated conductive wire is wound around the drum core 2 by the method shown in the above-described embodiment to form the coil 6, which is wound. The lead wire 5 is led out so that both ends of the wire are located near the groove 4 of the drum core 2 on the outer circumference of the winding.

At the same time, a ferritic member is formed into the shape shown in the drawing, for example, by forming the notch and the hole in the central portion of the cover in a separate step, and thereafter or simultaneously with the formation of the electrodes 3 on both sides. Form.

At the time of actually assembling the inductor, the reference numeral 1 in FIG.
As shown by 3, a heat resistant adhesive for fixing the drum core 2 is applied. Then, the drum core 2 in which the lead wire 5 of the coil 6 is drawn out from the groove 4 is positioned and housed in the hole of the cover 1, and the bottom of the upper flange 8 is coated with the heat-resistant adhesive 13. Stick to the surface. This fixed state is the state shown in FIGS. 16 to 22.

After that, the lead wire 5 and the electrode 3 are processed into an electrically connected state by the method shown in the above-described embodiment to complete the inductor.

In the seventeenth embodiment assembled as described above, the hole portion of the cover 1 is completely closed by the upper brim 8 of the drum core 7, and the surface on which the electrode 3 is arranged is located. Since the coil 6 and the coil 6 are almost cut off from each other, it is possible to minimize the magnetic flux leakage to the wiring pattern on the front surface side of the board when the board is mounted.

Therefore, it is of course possible to obtain the same effects as those of the above-described embodiments, and of course, the bottom portion of the recess is unnecessary as compared with the case where the recess is formed in the cover 1 as in the above-mentioned embodiments. Therefore, the thickness of the inductor can be reduced by the amount corresponding to the bottom of the recess, and it is possible to provide a further low-profile inductor in which the magnetic shield function is not deteriorated.

Further, the formation of both electrodes is also minimal, and when the substrate is mounted so that the upper flange 8 surface becomes the substrate surface, the electrode portion is not formed on the upper surface of the mounting surface. It is possible to prevent the pair from coming into contact with each other and malfunctioning. For example, it is possible to cover the upper part of the mounted inductor with a shield plate.

[Eighteenth Embodiment] In the seventeenth embodiment described above, an example in which the upper flange 8 of the drum core 2 has a larger diameter than the lower flange 9 has been described. However, the present invention is not limited to the above examples, and for example, when there is a demand for facilitating the production of the cover 1 or the drum core 2, or when further downsizing is required, the drum core 2 A hole is formed in the center of the cover 1 with the upper and lower flanges 8 and 9 having the same diameter.
The diameter error of the drum core
By reducing the rattling at the time of housing, by fixing the lead wire 5 to the electrode, even if the drum core 2 is suspended and fixed in the hole of the cover 1, a good fixed state can be maintained, and the low profile is achieved. An excellent inductor can be provided.

An eighteenth embodiment of the present invention will be described below with reference to FIG. FIG. 23 is an exploded perspective view of the eighteenth embodiment of the present invention.

In the eighteenth embodiment, as shown in FIG. 23, the upper flange 8 of the drum core 2 and the lower flange 9 have substantially the same diameter. Then, the diameter of the hole of the cover 1 is formed to be slightly larger than the diameters of the upper flange 8 and the lower flange 9 of the drum core 2, or formed to have substantially the same diameter.

At the time of manufacturing the inductor, the drum core 2 having the coil 6 formed therein is inserted or fitted into the hole of the cover 1 and positioned so that the upper and lower surfaces of the cover 1 and the upper and lower surfaces of the drum core 2 are substantially flush with each other. After that, the lead wire 5 is led out from the groove of the drum core 2 to the electrode surface of the cover 1 and the tip end portion of the lead wire 5 is fixed to the electrode 3 without bending in the same manner as in each of the above embodiments.

As a result, when the drum core 2 is fitted in the hole of the cover 1, the drum core 2 can be firmly hung and fixed without rattling even when it is inserted, and an inductor having an excellent low profile can be obtained. Can be provided.

Also, the diameter of the hole of the cover 1 is set to the drum core 2
Since the upper and lower flanges 8 and 9 are formed to have a diameter slightly larger than or substantially the same as the diameters of the upper and lower flanges 9, the functional simplifications of the above-described respective embodiments are achieved while achieving further simplification of the configuration. The same effect can be achieved.

[Nineteenth Embodiment] In the eighteenth embodiment described above, the upper and lower flanges 8 and 9 of the drum core 2 have the same diameter, and the upper and lower flanges 8 and 9 are the same. Groove 4
Then, the lead wire 5 is led out to the electrode 3 site by utilizing this groove 4. However, the present invention is not limited to the above example, and for example, even if the concave groove 4 is not formed in the upper flange 8 and the lower flange 9 of the drum core 2, the hole is formed on the side surface of the cover 1 on which the electrode is provided. Even if a groove is formed and the lead wire 5 is led out to the electrode 3 site by utilizing this groove, the same effects as those of the eighteenth embodiment can be obtained.

A nineteenth embodiment of the present invention in which a groove is formed on the side of the hole of the cover 1 on the side where the electrode is provided and the lead wire 5 is led to the electrode 3 portion by utilizing this groove. This will be described below with reference to FIG. FIG. 24 is a nineteenth embodiment according to the present invention.
FIG. 3 is an exploded perspective view of the embodiment of FIG.

In the nineteenth embodiment, as shown in FIG. 24, unlike the above-described eighteenth embodiment, the upper flange 8 of the drum core 2 is not provided with the concave groove in the lower flange 9, and the cover is not provided. The concave groove 14 is formed on the side surface of the hole 1 where the electrodes are provided.

When manufacturing the inductor, the coil 6 is used.
The drum core 2 formed with is inserted or fitted into the hole of the cover 1 and positioned so that the upper and lower surfaces of the cover 1 and the upper and lower surfaces of the drum core 2 are substantially flush with each other. When positioning
The lead wire 5 is passed through the groove 14 to form the electrode 3 of the cover 1.
Let the surface lead out. After that, the lead wire 5 is led out from the groove of the drum core 2 to the electrode surface of the cover 1, and the tip end portion of the lead wire 5 is fixed to the electrode 3 without bending in the same manner as in each of the above embodiments.

As a result, when the drum core 2 is fitted in the hole of the cover 1, it can be firmly hung and fixed without rattling even when it is inserted, and an inductor excellent in low profile can be obtained. Can be provided.

Since no groove is formed in the upper and lower flanges 8 and 9 of the drum core 2, the forces applied to the upper and lower flanges 8 and 9 can be evenly distributed. Therefore, even when the difference between the outer diameters of the upper collar 8 and the lower collar 9 and the diameter of the hole of the cover 1 is small and the drum core 2 is fitted into the hole of the cover 1, the lower collar 9 It is possible to assemble in a stable state without forcing unreasonable force to concentrate on a specific part of.

The concave groove 14 is not limited to the U-shaped groove having the same depth over the entire side surface as shown in FIG. 24, but the concave groove provided in the concave side surface of each of the above-described embodiments. It is a basic theory that it may be formed in the same shape as in No. 4. Even in this case, the same effect can be achieved.

[Other Embodiments] Although the electrodes 3 of the above-described embodiments are partially formed on the longitudinal side surface of the cover 1, they are formed on the longitudinal side surface of the cover 1. Needless to say, the same operation and effect as described above can be obtained without the use.

In addition, in the case of the eighteenth and nineteenth embodiments, the holes of the cover 1 are not limited to the case where they have the same diameter. By forming the drum core 2 into a tapered shape and fitting the drum core 2 with a certain amount of force, the bottom side of the hole can be almost completely adhered.

According to each embodiment described above,
The reliability of lead wire processing is improved while reducing the number of parts and the number of manufacturing steps to realize cost reduction, and it is possible to configure a closed magnetic circuit structure that is low in height, small in size, and has less leakage flux, and has a high allowable current and high L It is possible to provide an inductor and a method for manufacturing the inductor, which can obtain an inductor having high value and low noise.

The inductor of each of the above embodiments is most suitable for use as a low-height power inductor, for example. Further, it is optimal as a choke coil for a converter of a liquid crystal display, for which a small size and a low profile are required for various purposes. Similarly, it is also optimal as a choke coil for various thin DC-DC converters. The structure and shape can be particularly suitable for these applications.

[0130]

As described above, according to the present invention, the reliability of lead wire processing is improved while reducing the number of component parts and the number of manufacturing steps to realize cost reduction.
(EN) Provided are an inductor and a method for manufacturing the inductor, which can form a closed magnetic circuit structure having a low profile, a small size, and a small leakage flux, and can obtain an inductor having a high permissible current, a high L value and a low noise.

[Brief description of drawings]

FIG. 1 is a plan view of an inductor according to an embodiment of the present invention according to the present invention.

FIG. 2 is a front cross-sectional view of the inductor according to the present embodiment.

FIG. 3 is a side sectional view of the inductor according to the present embodiment.

FIG. 4 is an exploded perspective view of the inductor according to the present embodiment.

FIG. 5 is a flowchart for explaining an example of a method for manufacturing the inductor according to the present embodiment.

FIG. 6 is a completed perspective view of the inductor according to the present embodiment.

FIG. 7 is a perspective view of a cover for explaining a molding example of a cover according to a ninth embodiment of the present invention.

FIG. 8 is a perspective view of a cover for explaining a molding example of a cover according to a tenth embodiment of the present invention.

FIG. 9 is a perspective view of a cover for explaining a molding example of a cover according to an eleventh exemplary embodiment of the present invention.

FIG. 10 is a perspective view of a cover for explaining a molding example of a cover according to a twelfth exemplary embodiment of the present invention.

FIG. 11 is a perspective view of a cover for explaining a molding example of a cover according to a thirteenth embodiment of the present invention.

FIG. 12 is a perspective view of a cover for explaining a molding example of a cover according to a fourteenth exemplary embodiment of the present invention.

FIG. 13 is a perspective view of a cover for explaining a molding example of a cover according to a fifteenth embodiment of the present invention.

FIG. 14 is a diagram for explaining an example of a coil winding structure according to a sixteenth exemplary embodiment of the present invention.

FIG. 15 is an exploded perspective view of a seventeenth exemplary embodiment of the present invention.

FIG. 16 is a perspective view of a seventeenth embodiment.

FIG. 17 is a plan view of a seventeenth embodiment example.

FIG. 18 is a front view of the seventeenth embodiment.

FIG. 19 is a bottom view of the seventeenth embodiment.

FIG. 20 is a side view of the seventeenth embodiment.

FIG. 21 is a sectional view taken along the line AA of FIG. 17 of the seventeenth embodiment.

FIG. 22 is a sectional view taken along the line 17B-B of the seventeenth embodiment.

FIG. 23 is an exploded perspective view of an eighteenth embodiment of the present invention.

FIG. 24 is an exploded perspective view of a nineteenth exemplary embodiment of the present invention.

FIG. 25 is a front sectional view of a conventional inductor.

FIG. 26 is a front sectional view of another conventional inductor.

[Explanation of symbols]

1 Ferrite cover 2 drum core 3 electrodes 4 groove 5 coil lead wire 6 coil wire 7 reel 8 Upper Tsuba 9 Lower Tsuba 10 covering 11 electrodes 12 pedestals 13 Heat-resistant adhesive

Claims (25)

[Claims] 1. A drum core 2 having an upper collar 8 and a lower collar 9 integrally formed on both sides, a coil 6 wound between the upper collar 8 and the lower collar 9 of the drum core 2, and the drum core 2 A cover portion 1 having a storage portion capable of positioning and storing; an electrode 3 formed of a conductive material from at least an end portion of the cover 1 on a substrate mounting surface to both side surfaces; and an end portion of the coil 6 and the electrode 3 connected Lead wire 5
An inductor comprising: 2. The inductor according to claim 1, wherein the storage portion of the cover 1 is a concave portion capable of positioning and storing the drum core 2. 3. The inductor according to claim 2, wherein the cover 1 having an adhesive applied to the bottom of the recess is positioned and fixed by covering the drum core 2 in the recess. 4. The inductor according to claim 1, wherein the housing portion of the cover 1 is a hole portion capable of positioning and housing the drum core 2. 5. A recessed groove for positioning and leading the lead wire to the position of the electrode 3 is provided on a side surface of the housing of the cover 1 where the electrode is provided, and the recessed groove is inclined at a predetermined angle with respect to the upright direction. The inductor according to any one of claims 1 to 4, characterized in that: 6. A recessed groove for positioning and leading the lead wire to the position of the electrode 3 is provided on a side surface of the housing of the cover 1 on which the electrode 3 is disposed, and the recessed groove is on a side of the housing 3 where the electrode 3 is disposed. The inductor according to any one of claims 1 to 4, further comprising a notch extending to a portion where the electrode 3 is disposed. 7. A recessed groove for positioning and leading the lead wire to the position of the electrode 3 is provided on a side surface of the housing of the cover 1 on which the electrode is provided, and the recessed groove has a predetermined width. Claim 5
Alternatively, the inductor according to claim 6. 8. A recessed groove for positioning and leading the lead wire to the position of the electrode 3 is provided on a side surface of the housing of the cover 1 where the electrode is provided, and the recessed groove is a substantially V-shaped groove. The inductor according to claim 5 or 6, wherein 9. A recessed groove for positioning and leading the lead wire to the position of the electrode 3 is provided on a side surface of the housing of the cover 1 where the electrode is provided, and the groove rises a predetermined distance from the lowermost end of the housing. 9. The inductor according to claim 1, wherein the inductor is a notch from a portion to a portion where the electrode 3 is provided. 10. A concave groove for positioning and leading the lead wire to the position of the electrode 3 is provided on the side surface of the drum core 2 on which the electrode is arranged when the upper and lower collars 8 and 9 are accommodated in the accommodating portion of the cover 1. The inductor according to any one of claims 1 to 4, characterized in that. 11. An upper flange 8 of the drum core 2 is formed to have a diameter larger than that of the lower flange 9, and a housing portion of the cover 1 has a notch portion having substantially the same thickness as the upper flange 8 of the drum core 2 and the upper flange 8. The inductor according to any one of claims 1 to 10, wherein the coil 6 part and the lower collar 9 part except for are formed of holes capable of positioning and accommodating. 12. An adhesive agent is applied to a contact surface of the upper flange 8 of the cutout portion, and the upper flange 8 of the drum core 2 is applied to the adhesive agent application portion.
The inductor according to claim 11, characterized in that the coil surfaces of (1) are brought into contact with each other to be positioned and fixed. 13. The electrode 3 according to claim 1, wherein the electrode 3 is formed by forming a conductive paste layer by sputtering, metal plate, or baking after dipping and plating. Inductor. 14. The lead wire 5 is connected to the electrodes 3 provided at both ends of the cover 1 by thermocompression bonding, soldering, a conductive adhesive, or welding.
An inductor according to claim 13. 15. A coil 6 is formed by winding a conductive wire between the upper and lower collars 9 of a drum core 2 having upper and lower collars 9 integrally formed on both sides to form a coil 6. A cover made of a magnetic material, which has a magnetically shielded drum core 2 and has an accommodating portion capable of positioning and accommodating the drum core 2 and at least an electrode 3 made of a conductive material extending from the end of the board mounting surface to both sides thereof. A method for manufacturing an inductor, characterized in that the coil 6 is housed in the housing part of the part 1 and the end part of the coil 6 and the electrode 3 are connected by a lead wire 5. 16. The housing of the cover 1 is a recess for positioning and housing the drum core 2, and the cover 1 having an adhesive applied to the bottom of the recess is covered and positioned and fixed on the drum core 2 in the recess. 16. The method for manufacturing an inductor according to claim 15, wherein: 17. The method of manufacturing an inductor according to claim 15, wherein the housing portion of the cover 1 is a hole portion capable of positioning and housing the drum core 2. 18. A concave groove for positioning and leading the lead wire to the position of the electrode 3 is provided on a side surface of the housing portion of the cover 1 where the electrode is provided, and the concave groove is formed by inclining at a predetermined angle with respect to an upright direction. 18. The method for manufacturing an inductor according to claim 15, wherein: 19. A recessed groove for positioning and leading the lead wire to the position of the electrode 3 is provided on a side surface of the accommodating portion of the cover 1 where the electrode 3 is disposed, and the recessed groove is a side surface of the accommodating portion where the electrode 3 is disposed. 18. The method of manufacturing an inductor according to claim 15, further comprising forming a groove having a predetermined width including a notch or a substantially V-shaped groove up to a portion where the electrode 3 is disposed. 20. A concave groove for positioning and leading the lead wire to the position of the electrode 3 is provided on a side surface of the cover 1 on the side where the electrode is provided, and the groove rises a predetermined distance from the lowermost end of the case. 19. The method of manufacturing an inductor according to claim 15, wherein the notch is formed from a portion to a portion where the electrode 3 is provided. 21. Side surfaces of the drum core 2 on which electrodes are arranged when the upper and lower flanges 8 and 9 are housed in a housing portion of the cover 1.
19. The method of manufacturing an inductor according to claim 15, further comprising forming a groove for positioning and leading the lead wire to the position of the electrode 3. 22. The upper collar 8 of the drum core 2 is formed to have a diameter larger than that of the lower collar 9, and the housing portion of the cover 1 has a notch portion having substantially the same thickness as the upper collar 8 of the drum core 2 and the upper collar 8. 22. The method of manufacturing an inductor according to claim 15, wherein the coil 6 part and the lower collar 9 part except for are formed of holes capable of positioning and accommodating. 23. An adhesive is applied to a contact surface of the upper flange 8 of the cutout portion, and the upper flange 8 of the drum core 2 is applied to the adhesive application portion.
23. The method for manufacturing an inductor according to claim 22, wherein the coil surfaces of the above are brought into contact with each other to be fixedly positioned. 24. The electrode 3 according to claim 15, wherein the electrode 3 is formed by forming a conductive paste layer by sputtering, metal plate, or baking after dipping and plating. Manufacturing method of inductor. 25. The lead wire 5 is connected to the electrodes 3 provided at both ends of the cover 1 by thermocompression bonding, soldering, a conductive adhesive, or welding.
The method for manufacturing an inductor according to any one of claims 5 to 24.