JP2001358020A - Hybrid component and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hybrid component, together with its manufacturing method, which is easily miniaturized with excellent component characteristics. SOLUTION: A hybrid component comprises an internal coil 1 where an electrode layer 5 and an insulator layer 4 are laminated, a surface layer coil 2 of a spiral conductor, and an external electrode 3 connected to the electrode layer 5 or the surface layer coil 2. This configuration can provide hybrid components of various characteristics which are easily manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite component used for various electronic devices and communication devices, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Composite components are widely used in various electronic devices and communication devices. In recent years, small or thin composite components have been increasingly required. Composite parts as countermeasures are also becoming increasingly important.

Conventionally, a composite component satisfying these demands is a laminated coil component obtained by alternately laminating a ferrite magnetic layer and a coil conductor layer (for example, Japanese Patent Publication No. Sho 57-3).
No. 9521) and a composite component further laminated with a multilayer ceramic capacitor (for example, Japanese Patent Publication No. 59-24534, 62).
-28891). As a composite component of a small coil component, a composite component obtained by arranging a plurality of the above-described laminated coil components in a coil laminating plane, or a composite component in which the coil components are superposed in the coil axis direction, or a double composite coil component Has been proposed.

[0004]

As described above, a composite component composed of a plurality of coils is generally arranged, for example, by arranging or superimposing stacked coils. With the configuration, there was a limit to miniaturization.

The present invention solves the above-mentioned conventional problems, and does not have a structure obtained by stacking laminated coils together. Further, since the coils are not based on windings, the productivity is excellent and various types of coils are provided. It is an object of the present invention to provide a composite component capable of easily realizing a composite component having the same type and frequency characteristics, and a method for manufacturing the same.

[0006]

In order to solve the above-mentioned problems, a composite part according to the present invention comprises a spiral surface coil composed of a part of a conductor, an external electrode composed of the remaining part of the conductor, and the surface layer. This is a composite component having a configuration having an internal coil composed of an insulator layer and an electrode layer disposed inside the coil.

According to the present invention, since the surface coil is provided on the surface of the internal coil composed of the insulator layer and the electrode layer, a small composite component can be obtained. Various frequency characteristics can be realized by variously changing the characteristics of the insulator. Transformers having various characteristics can be realized by appropriately selecting the orientation and the positional relationship between the two coils.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to an insulator layer, an electrode layer provided inside the insulator layer to serve as an internal coil, and a surface coil provided on the outer periphery of the internal coil. And external electrodes that are electrically connected to the electrode layer and / or the surface coil, and can be formed with priority given to the characteristics of the internal coil, and have the effect of enabling a transformer.

According to a second aspect of the present invention, there is provided a surface coil including a part of a conductor, an external electrode including a remaining portion of the conductor, and an electrode layer serving as an insulator and an internal coil disposed inside the surface coil. This has the effect of enabling a configuration giving priority to the characteristics of the internal coil, further reducing the size, and having a structure capable of using a transformer.

According to a third aspect of the present invention, in particular, the surface coil is provided with an exterior material covering a part or the whole of the surface thereof, so that it is possible to form the internal coil by giving priority to the characteristics of the internal coil.
It has the effect that trans can also be obtained.

According to the invention described in claim 4, in particular, the surface coil is formed in a spiral shape, and has an effect of improving characteristics.

According to a fifth aspect of the present invention, the interaction between the two coils is reduced by making the axial direction of the surface coil substantially orthogonal to the axial direction of the electrode layer serving as the internal coil. It has the action of:

[0013] The invention described in claim 6 has an effect that the magnetic coupling can be increased particularly when the axial direction of the surface coil is substantially parallel to the axial direction of the internal coil. .

According to a seventh aspect of the present invention, in particular, a part of the external electrode and the surface coil are integrally formed.
This has the effect of further improving the connection reliability of the electrodes.

In the invention according to claim 8, the exterior material is made of an insulator, and has an effect of improving the insulating property.

According to a ninth aspect of the present invention, in particular, the exterior material is formed of a mixture of an insulator and a magnetic material, and has an effect of reducing leakage magnetic flux and enabling high-density mounting. .

The tenth aspect of the present invention has the effect of improving the strength of parts, particularly when the exterior material contains ceramic insulating powder.

The invention according to claim 11 is that, in particular, the external electrode includes a first external electrode connected to one end of the surface coil and one end of the electrode layer, and the other end of the surface coil and the other end of the electrode layer. It is provided with a second external electrode to be connected, and has an effect that a parallel coil can be obtained.

According to a twelfth aspect of the present invention, the external electrode comprises:
A first external electrode connected to one end of the surface coil, a second external electrode connected to one end of the electrode layer, and a third external electrode connected to the other end of the surface coil and the other end of the electrode layer. It has an effect that a series coil having an intermediate terminal of the coil can be obtained.

In the invention according to claim 13, the surface coil is particularly provided with two layers with the second insulator layer interposed therebetween, and has an effect that a large inductance can be ensured even though it is small.

According to a fourteenth aspect of the present invention, a first step of forming an insulator layer and an electrode layer serving as an internal coil, a second step of covering an outer periphery of the insulator layer with a conductor, A third step of removing portions other than those constituting the external electrode and the surface coil, and has an effect that a composite component having a small size and excellent characteristics can be obtained.

According to the fifteenth aspect of the present invention, in particular, the third step is performed by laser processing or cutting processing, and has an effect that an external electrode and a surface coil can be easily formed.

According to a sixteenth aspect of the present invention, in particular, the third step includes a step of masking a portion where an external electrode and a surface coil are to be formed, and a step of removing a portion not masked. Thus, the outer electrode and the surface coil can be easily formed.

According to a seventeenth aspect of the present invention, there is provided a first step of forming an internal coil comprising an insulator layer and an electrode layer, and masking a portion of the outer periphery of the insulator layer where an external electrode and a coil are not formed. It comprises a fourth step of applying and a fifth step of forming a conductor in the unmasked portion, and has the effect of obtaining a compact composite part having excellent characteristics.

[0025] The invention according to claim 18 is the first step of forming an internal coil composed of an insulator layer and an electrode layer, and only the step of forming an external electrode and a coil on the outer periphery of the insulator layer. It comprises a sixth step of forming a conductor, and has an effect that a composite component having a small size and excellent characteristics can be obtained.

According to a nineteenth aspect of the present invention, a first step of forming an internal coil comprising an insulator layer and an electrode layer and a second step of forming a first conductor on the outer periphery of the insulator layer And a seventh step of covering the conductor with a second underlayer, and an eighth step of forming a second conductor on the surface of the second underlayer. It has the effect that a composite part can be obtained.

[0027] According to a twentieth aspect of the present invention, there is provided an insulating layer,
An electrode layer provided inside the insulator layer and serving as an internal coil, a surface coil provided on the outer periphery of the insulator layer, and an external electrode electrically connected to the electrode layer or / and the surface coil are at least included. The electronic device has a function of providing an electronic device with excellent noise suppression measures.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic perspective view showing the appearance of a composite part according to an embodiment of the present invention.

As shown in FIG. 1, an electrode layer 5 serving as an internal coil 1 is provided inside an insulator layer 4, and a surface coil 2 made of a spiral conductor is provided on the surface of the insulator layer 4.
Furthermore, the surface of the internal coil 1 has two external electrodes 3. Each end of the electrode layer 5 of the internal coil 1 is connected to two external electrodes 3 respectively. Further, both ends of the surface coil 2 are similarly connected to the external electrodes 3.

The internal coil 1 shown in the above example comprises an insulator layer 4 and an electrode layer 5. The insulator layer 4 is used to change the characteristics of the internal coil 1. In particular, it is possible to change the coil characteristics by appropriately selecting a non-magnetic material or a magnetic material.

Further, an exterior material may be further formed on the surface other than the external electrode 3, and when it is desired to ensure sufficient insulation of the surface coil 2 or to change the electrical characteristics of the coil, the exterior material is appropriately formed. This is made possible by selection. By mixing the magnetic material, the leakage magnetic flux of the surface coil 2 can be reduced, and the electrical characteristics of the surface coil 2 can be changed. Further, by mixing the ceramic insulating powder, the strength of the exterior material is improved, and the occurrence of defects during mounting can be avoided. Furthermore, it is also possible to provide a conductor layer on the surface of the exterior material to perform shielding.

The insulating layer 4 and the exterior material may be either a non-magnetic material or a magnetic material, and only insulation is required at least. However, the internal coil 1 made of a spiral conductor
By changing the patterning of the surface coil 2 or partly, the coil can be easily changed to a series coil. Therefore, in order to control the electrical characteristics of the coil, the magnetism or the dielectric property may be appropriately selected. As a non-magnetic material or a low dielectric constant material, if it is electrically insulating such as an organic insulating material such as glass epoxy or polyimide, or an inorganic insulating material such as glass, glass ceramics, CuZn ferrite or ceramics. Any material may be used as long as it has a small relative permeability and a small relative permittivity. The magnetic material may be any ferrite material having a generally high magnetic permeability, such as a NiZn-based, NiZnCu-based, or MnZn-based material. In particular, as for the exterior material, a mixture of an organic substance and inorganic particles may be used, and the physical properties of the inorganic particles may be appropriately selected.

When the insulating layer 4 and the exterior material are made of a magnetic material, the inductance value of the coil can be increased, and when the material is made of a non-magnetic material, the inductance value can be decreased. The resistance component of the coil can also be controlled.
For example, when the insulator layer 4 is made of a magnetic material, the internal coil 1
Uses only the loss of the magnetic material. On the other hand, the surface coil 2 suffers from the loss of the magnetic material and the loss due to the presence of the electrode layer 5 of the internal coil.

By forming the insulator layer 4 with a low dielectric constant material, the stray capacitance of the surface coil 2 can be reduced, and the self-resonant frequency of the surface coil 2 can be increased. As the low dielectric constant substance, any substance having a generally known low relative dielectric constant may be used. The material may be appropriately selected from the pattern of the surface coil 2 and the necessary self-resonant frequency.

As the material of the surface coil 2 or the electrode layer 5, any material may be used as long as it is an electrically good conductor, but copper, silver and a palladium alloy or silver is desirable.

The external electrode 3 may be made of a conductive material. However, it is generally preferable that the external electrode 3 be composed of a plurality of layers instead of a single layer. Mounting strength or solder wettability during mounting,
It is necessary to consider solder cracks, etc. Specifically, use the same conductive material as the surface coil 2 or the electrode layer 5, use nickel to prevent solder cracks in the intermediate layer, and use solder for the outermost layer. Use solder or tin with good wettability.

By integrating the surface coil 2 and a part of the external electrode 3 into one layer, the surface coil 2 and the external electrode 3
Connection reliability can be improved. For example, the surface of the internal coil 1 is formed of a conductor, copper, and the surface coil 2 is formed of a single copper.
By using copper as a base and forming a laminated structure of a Ni layer and a Sn layer, connection reliability is improved and mountability as a chip component is also improved.

Also, a predetermined wiring pattern is formed on a ceramic substrate such as alumina or ferrite, a window is provided on the ceramic substrate, a composite component is inserted, and the wiring pattern and the external electrode 3 of the composite component are brought into contact with each other to form a thick film forming process. Since it is electrically connected by baking using, a structure corresponding to this thick film forming process may be provided with increased heat resistance.

As described in the above example, by forming a composite component having the internal coil 1 formed by laminating the electrode layer 5 and the insulator layer 4 and having the surface coil 2 on the surface of the internal coil 1 Unlike the conventional stacked coil array type, it is possible to provide a composite component that can be miniaturized, easily manufactured, and can easily obtain transformers of various couplings. The transformer can also be regarded as a composite component having a plurality of independent coils.

In the above-described embodiment, only the surface-mount type having external electrodes 3 provided at both ends and the like has been described. However, a terminal in which a pin terminal is implanted in an insulator, or a terminal instead of the external electrode 3 is used. It is also possible to easily form a lead-type composite component in which the cap-shaped electrode having the above structure is fitted and coupled to both ends of the internal coil 1.

As described above with reference to some specific examples, the composite component of the present invention comprises an internal coil 1 in which an electrode layer 5 and an insulator layer 4 are laminated, and a spiral conductor on the surface of the internal coil 1. This is a composite component having a surface coil 2 and an external electrode 3 connected to the electrode layer 5 or the surface coil 2, or further having an exterior material. In the example shown in FIG. 2, an example of the position where the electrode layer 5 is completely included inside the surface coil 2 is shown, but the relative position between the electrode layer 5 and the surface coil 2 with respect to the axial direction of the surface coil is changed. It may be shifted. By shifting, it is possible to change the magnetic coupling state of both coils. The surface coil 2 is made of a conductive material formed directly on the surface of the internal coil 1 without winding a covered copper wire.

FIG. 2 is a perspective perspective view showing an external appearance of a composite component having a configuration substantially similar to that of FIG. 1, but in which the axial direction of the internal coil 1 and the axial direction of the surface coil 2 are substantially parallel. Further, in this case, four external electrodes 3 are provided on the surface of the internal coil 1. As shown in FIG.
And each terminal of the surface coil 2 is a separate external electrode 3
Is shown. Such a configuration is excellent for use in a transformer. The connection between the internal coil 1 and the external electrode 3 is made through a through hole provided inside as shown in FIG.

Hereinafter, a method for manufacturing a composite part according to the present invention will be described.

One method of manufacturing a composite component according to the present invention includes a first step of forming an internal coil 1 having an insulator layer 4 and an electrode layer 5, and a second step of covering the outer periphery of the internal coil 1 with a conductor. And a third step of removing portions other than those constituting the external electrode 3 and the surface coil 2 in the conductor.

Next, a more detailed method of manufacturing a composite part according to the present invention will be described with reference to the drawings.

FIGS. 1 and 2 are perspective perspective views schematically showing the structure of one composite part of the present invention. The manufacturing method will be further described with reference to these figures.

First, the insulator layer 4 is formed. Next, FIG.
As shown in (1), a through hole is formed in the insulator layer 4, and an electrode layer 5 having a predetermined pattern is formed. The insulator layer 4 having the electrode layer 5 formed thereon and the insulator layer 4 are sequentially laminated. A conductor is formed on the laminate obtained by lamination, that is, on the surface of the internal coil 1. A conductor formed on the surface of the internal coil 1 is spirally patterned as shown in FIG. 1 to form a surface coil 2 and an external electrode 3. Further, in some cases, an exterior material is formed on a surface other than the external electrode 3. By the above method, the composite part of the present invention as shown in FIG. 1 can be obtained.

As shown in FIG. 1, a method of spirally patterning the surface coil 2 is a method of laser processing, a method of cutting, or a method of masking and removing a conductor in a portion not subjected to masking. and so on. Further, as another method, there is a method of masking a portion where the external electrode 3 and the surface coil 2 are not formed and forming a conductor in a portion where the external electrode 3 and the surface coil 2 are not formed. There is also a method of forming a conductor.

The composite part of the present invention can be obtained by the above method. The firing may be performed in a state where the insulator layer 4 and the electrode layer 5 shown in FIG.
May be performed after the conductor is formed on the entire surface of the substrate. That is, it may be appropriately determined in consideration of the constituent materials, productivity, and the like.
Alternatively, a method in which the external electrode 3 is not formed may be fired, and the external electrode 3 may be formed after firing. Explaining an example of the formation method, a conductor is formed in the same shape as the external electrode 3 and fired once. This conductor becomes a base layer of the external electrode 3. Next, nickel plating and solder or tin plating are performed using the conductor as an electrode. Finally, the external electrode 3
Has a three-layer structure of a conductor of a base layer of the end face electrode formed by firing and nickel and solder or tin formed by electroplating.

The above-described insulator layer 4 is generally formed by a generally known green sheet molding method or printing method, but can also be formed by a dipping method, a powder molding method or a spin coating method.

The surface coil 2, the electrode layer 5, or the external electrode 3 is generally formed by a printing method or a coating method. However, a pattern is formed by using a laser, or a pattern is formed by spraying water, carbon dioxide, abrasive grains, or the like. For example, a method of transferring a conductor previously formed into a predetermined shape by a mold or plating, a method such as dropping, potting, or a spraying method may be used. In particular, the surface coil 2 composed of a spiral conductor is formed by plating, vapor deposition, sputtering, drawing, transfer, printing, dipping, and the like, and the spiral patterning can be performed using cut, masking, etching, or the like. it can. Further, the surface shape of the internal coil 1 is formed into a screw shape, a conductor is formed on the surface, and the surface coil 2 is dropped to the extent that the thread is eliminated, thereby forming the surface coil 2 made of a spiral conductor on the surface of the internal coil 1. It is also possible.

The spiral coil is generally used as the pattern of the surface coil 2. However, it may be bent or spiral on the four side surfaces of the chip component as shown in FIG. In this case as well, only one surface may be used or four surfaces may be used, and may be appropriately selected depending on required coil characteristics. Further, the surface coil 2 may be made of a parallel conductor. For example, an independent surface coil 2 is formed on each surface,
By connecting the respective ends to the external electrodes 3 present on both end surfaces, the surface coil 2 can be constituted by four independent conductors, and it is possible to improve the DC resistance and the withstand current or the DC superimposition characteristics. . When only the DC resistance is lowered, the surface coil 2 may be formed on the entire surface of the internal coil 1.

The composite part obtained by the manufacturing method of the present invention is a composite part having excellent heat resistance, so that it can be easily modularized. For example, a predetermined wiring layer is formed on a ceramic substrate such as an alumina substrate or a ferrite substrate,
The wiring of the substrate and the connection of the external electrodes 3 of the composite component can be performed simultaneously, so that they can be integrated or assembled. In this case, a window is opened at a predetermined position on the substrate, and the external electrode
Terminal pins on the external electrodes 3 on the side surfaces of the composite component, and the connection between the pins and the wiring on the ceramic substrate. can get. In this case, an ordinary thick film forming process using a generally known ceramic plate can be applied. The external electrodes 3 of the composite component are not premised on soldering, but may be fired and electrically connected.

The paste or slurry for forming each of the above-mentioned layers is prepared by mixing each powder with a solvent such as butyl carbitol, terpineol and alcohol, a binder such as ethyl cellulose, polyvinyl butyral, polyvinyl alcohol, polyethylene oxide and ethylene-vinyl acetate;
Further, a sintering aid such as various oxides or glasses may be added, and a plasticizer or a dispersant such as butylbenzyl phthalate, dibutyl phthalate, or glycerin may be added. Each layer is formed using a kneaded material obtained by mixing these. These are laminated in a predetermined structure as described above and fired to obtain a composite part. As the slurry for producing the green sheet, various solvents having excellent evaporability, such as butyl acetate, methyl ethyl ketone, toluene, and alcohol, are preferable instead of the above-mentioned solvents.

The firing temperature range is about 800 ° C. to 13 ° C.
It is in the range of 00 ° C. In particular, it depends on the conductor material. For example, when silver is used as the conductor material, it is necessary to be around 900 ° C., and at 950 ° C. for an alloy of silver and palladium, and nickel or palladium is used as the conductor material for firing at a higher temperature. .

[0057]

Next, more specific embodiments of the present invention will be described.

(Example 1) CuZn ferrite powder 1
8 g of butyral resin, 4 g of butylbenzyl phthalate, 24 g of methyl ethyl ketone and 24 g of butyl acetate were mixed with 00 g, and kneaded using a pot mill to prepare a nonmagnetic slurry.

Using this slurry, a nonmagnetic green sheet having a thickness of 0.2 mm was prepared after drying using a coater. The green sheet was formed on a PET film.

In order to obtain an internal coil 1 composed of a laminate as shown in FIG. 1 using a non-magnetic green sheet,
An electrode layer 5 and a through hole were formed. The electrode layer 5 was formed using a commercially available conductive paste made of silver and a printing machine.

These non-magnetic green sheets were laminated as shown in FIG. Use a hot press for lamination,
The platen temperature of the hot press was set at 100 ° C and the pressure was 500
kg / cm ² .

The laminate was fired at 900 ° C. for 2 hours.

A conductor was formed on the entire surface of the fired laminate, and the surface coil 2 was formed into a spiral pattern as shown in FIG. In addition, copper was used for the surface coil 2, and the conductor was cut into a spiral shape by using a laser to form the surface coil 2 in a spiral shape. Further, external electrodes 3 as shown in FIG. 1 were formed.

No defects such as peeling, cracking and warping were observed in the composite part of the present invention obtained by the above method.

Next, when various electric characteristics were measured using an impedance analyzer or a network analyzer, a composite component having excellent characteristics was obtained.

A composite part shown in FIG. 2 was prepared in the same manner, and various electrical characteristics of the composite part obtained in the same manner as above were measured using an impedance analyzer or a network analyzer. The transformer had excellent electrical characteristics.

(Example 2) 8 g of butyral resin, 4 g of butylbenzyl phthalate, 24 g of methyl ethyl ketone and 24 g of butyl acetate were mixed with 100 g of NiZnCu-based ferrite powder and kneaded using a pot mill to prepare a ferrite slurry. .

Using this slurry, a ferrite green sheet having a thickness of 0.2 mm was prepared after drying using a coater. The green sheet was formed on a PET film.

Using a ferrite green sheet as in Example 1, a laminate as shown in FIG. 1 was formed as in Embodiment 1.

The laminate was fired at 900 ° C. for 2 hours.

A spiral conductor and end face electrodes were formed on the surface of the fired laminate in the same manner as in Example 1.

No defects such as peeling, cracking and warping were found in the composite part of the present invention obtained by the above method.

Next, when various electric characteristics were measured using an impedance analyzer or a network analyzer, it was found that the composite component had excellent characteristics.

A composite part shown in FIG. 2 was prepared in the same manner, and various electric characteristics were measured using an impedance analyzer or a network analyzer in the same manner as described above. there were.

(Example 3) An exterior material was further formed on the surface of the internal coil 1 produced in Example 1 and Example 2, and the surface of the internal coil 1 other than the external electrode 3 was covered with the exterior material.

The obtained composite part was a composite part having excellent insulation properties.

As the exterior material, there were used one using a thermosetting resin and two using a thermosetting resin containing ferrite powder.

[0078]

As is clear from the above description, the composite component of the present invention comprises an internal coil having an electrode layer and an insulator layer laminated, a surface coil made of a spiral conductor on the surface of the internal coil, and an electrode. It is possible to easily obtain a composite component having excellent electrical characteristics and miniaturization, having an external electrode connected to a layer or a surface coil, or further having an exterior material.

[Brief description of the drawings]

FIG. 1 is a schematic perspective perspective view showing an embodiment of a composite part according to the present invention.

FIG. 2 is a schematic perspective perspective view showing another embodiment of the composite part of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Internal coil 2 Surface coil 3 External electrode 4 Insulator layer 5 Electrode layer

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hiroyuki Ishitomi 1006 Kazuma, Kadoma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. F term (reference)

Claims (20)

[Claims] 1. An insulator layer, an electrode layer provided inside the insulator layer and serving as an internal coil, a surface coil provided on an outer periphery of the insulator layer, the electrode layer and / or the surface coil. A composite component consisting of external electrodes that are electrically connected. 2. A composite component comprising: a surface coil composed of a part of a conductor; an external electrode composed of the remaining part of the conductor; an insulator disposed inside the surface coil; and an electrode layer serving as an internal coil. 3. The composite component according to claim 1, wherein the surface coil includes an exterior material covering a part or the entire surface of the surface coil. 4. The composite component according to claim 1, wherein the surface coil has a spiral shape. 5. An axial direction of a surface coil and an axial direction of an electrode layer serving as the internal coil are substantially orthogonal to each other.
A composite part according to item 1. 6. The composite component according to claim 1, wherein the axial direction of the surface coil and the axial direction of the internal coil are substantially parallel. 7. The composite part according to claim 1, wherein a part of the external electrode and the surface coil are integrated. 8. The composite component according to claim 3, wherein the exterior material is an insulator. 9. The composite component according to claim 3, wherein the exterior material is a mixture of an insulator and a magnetic material. 10. The composite component according to claim 3, wherein the exterior material includes a ceramic insulating powder. 11. An external electrode comprising: a first external electrode connected to one end of a surface coil and one end of an electrode layer; and a second external electrode connected to the other end of the surface coil and the other end of the electrode layer. The composite component according to claim 1, further comprising: 12. The external electrode includes a first external electrode connected to one end of a surface coil, a second external electrode connected to one end of the electrode layer, and another end of the surface coil and the other of the electrode layer. 3. The composite part according to claim 1, further comprising a third external electrode connected to the end. 13. The composite component according to claim 1, wherein the surface coil includes two layers via a second insulator layer. 14. A first step of forming an insulator layer and an electrode layer serving as an internal coil, a second step of covering an outer periphery of the insulator layer with a conductor, and forming an external electrode and a surface coil of the conductor. And a third step of removing parts other than the part to be formed. 15. The method according to claim 14, wherein the third step is performed by laser processing or cutting. 16. The method according to claim 1, wherein the third step includes a step of masking a portion where the external electrode and the coil are to be formed, and a step of removing a portion not masked.
5. The method for producing a composite part according to 4. 17. A first step of forming an internal coil including an insulator layer and an electrode layer, and a fourth step of masking a portion of the outer periphery of the insulator layer where an external electrode and a coil are not formed, A fifth step of forming a conductor in the unmasked portion. 18. A first step of forming an internal coil including an insulator layer and an electrode layer, and a sixth step of forming a conductor only on a portion where an external electrode and a coil are formed on the outer periphery of the insulator layer. A method of manufacturing a composite part comprising the steps of: 19. A first step of forming an internal coil comprising an insulator layer and an electrode layer, and a first step of forming an inner coil around the insulator layer.
A second step of forming a second conductor, a seventh step of covering the conductor with a second underlayer, and a second step of covering the second underlayer with a second underlayer.
An eighth aspect of the present invention is a method for manufacturing a composite part, comprising: 20. An insulator layer, an electrode layer provided inside the insulator layer and serving as an internal coil, a surface coil provided on an outer periphery of the insulator layer, the electrode layer and / or the surface coil. An electronic device using a composite component having at least an external electrode electrically connected thereto.