JP3309831B2 - Inductance element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inductance element used for a mobile communication device, a power supply, and other electronic devices.

[0002]

2. Description of the Related Art FIG. 9 is a perspective view showing a conventional inductance element (Japanese Utility Model Laid-Open No. 61-144616). In FIG. 9, reference numeral 1 denotes a base, and the base 1 has flanges 2 and 3 at both ends.
Are provided, and a winding portion 4 is formed between the flange portion 2 and the flange portion 3. The flanges 2 and 3 are provided with grooves 5 respectively. Reference numeral 6 denotes a winding wound around the base 1, and the ends of the winding 6 are respectively held in the grooves 5.
With such a configuration, when mounting an inductance element on a circuit board or the like, there is no directionality, the mountability is improved, and the productivity of the circuit board is improved. In addition, since the winding does not protrude from the flange portion serving as the joining portion, the mountability can be improved.

Another conventional technique is disclosed in, for example,
JP-A-124748, JP-A-8-124747, JP-A-8-213248 and Japanese Utility Model Laid-Open No. 3-1.
No. 510, JP-A-9-306744, and the like.

Further, as disclosed in Japanese Patent Application Laid-Open No. 10-172832, a configuration is known in which a tapered portion is provided between a winding portion for winding a winding and a flange portion serving as a terminal portion at both ends.

[0005]

However, in the above arrangement, the terminal electrodes provided at both ends of the base are silver and the base is white, so that there is an error in the judgment of non-defective / defective products in image recognition. However, there is a problem that productivity is low. This seems to be due to the fact that the color of the base is similar to the color of the terminal electrode, so that it is determined that the terminal electrode is formed larger than the prescribed size.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide an inductance element capable of easily determining a terminal electrode and improving productivity.

[0007]

According to the present invention, there is provided a base, a winding wound around the base, a terminal electrode provided on the base and joined to the winding, and a protective material covering the winding. Wherein the base is exposed between the terminal electrode and the protective material, wherein the color of the outermost layer of the terminal electrode is different from the color of the base and the protective material.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a substrate, a winding wound on the substrate, a terminal electrode provided on the substrate and joined to the winding, and a protection covering the winding. And the base is exposed between the terminal electrode and the protective material.
In this inductance element, the color of the outermost layer of the terminal electrode is different from the color of both the substrate and the protective material, so that the outermost layer of the terminal electrode, the substrate, and the protective material that are exposed outside the element. Thus, the terminal electrodes can be reliably recognized by image recognition, so that the determination of defective products and non-defective products can be more reliably performed, and the productivity can be improved.

According to a second aspect of the present invention, in the first aspect, the color of the substrate and the protective material is made the same, so that the color substantially appearing on the surface of the element is the same as the color of the outermost surface of the terminal electrode, the substrate, and the protective material. It becomes two colors with the color of the material, and the judgment can be performed more reliably.

According to a third aspect of the present invention, in the second aspect, the base electrode and the protective material are made black, so that the terminal electrode outermost layer is white or silver. The distinction can be easily performed, and the accuracy of image recognition can be improved.

According to a fourth aspect of the present invention, in the first to third aspects, the height P1, width P2, and length P3 of the element are set as follows: 0.4 mm <P1 <1.2 mm 0.4 mm <P2 <1.2 mm By setting 0.9 mm <P3 <2.0 mm, the size is small, the mechanical strength is improved, and the winding of the winding can be easily caused, such as disconnection.

Hereinafter, embodiments of the present invention will be described.

FIG. 1 is a perspective view showing an inductance element according to an embodiment of the present invention.

In FIG. 1, reference numeral 7 denotes a base, and the base 7 is made of a nonmagnetic material such as alumina or ferrite (specifically, Ni-M
Magnetic materials such as n-based ferrite and Ni-Zn-based ferrite are used. When a nonmagnetic material such as alumina is used as a constituent material of the base 7, the corresponding frequency is 10
The frequency is preferably 0 MHz or more. In particular, when the above-mentioned alumina or a material containing alumina is used as the nonmagnetic material, it is very advantageous in terms of characteristics and cost. Also, the base 7
When a magnetic material such as ferrite is used as a constituent material of (1), it is advantageous in characteristics, workability and cost.

FIG. 2 is a perspective view showing only the base 7 of the inductance element according to one embodiment of the present invention. As shown in FIG. 2, a base 7 includes a winding portion 8 for winding a winding described later.
And flange portions 9 and 10 provided at both ends of the winding portion 8, respectively. The cross-sectional shapes of the winding portion 8 and the flange portions 9 and 10 are substantially rectangular parallelepipeds. In addition, the winding part 8 is a collar part 9,
10, the diameter of the winding portion 8 is smaller than the diameter of the flange portions 9 and 10. Since the winding to be described later is wound around the winding portion 8, it is preferable that the corner portion 8a is chamfered or tapered for the purpose of preventing a film or the like of the winding from being damaged and short circuiting.

Further, for example, by providing a tapered portion 11 at the boundary between the flange portion 10 and the winding portion 8, it is possible to easily wind the winding and prevent the winding coating from being damaged. . Similarly, a tapered portion 12 was provided at the boundary between the flange portion 9 and the winding portion 8.

Reference numeral 13 denotes a winding wound around the base 7;
3 is wound on the winding portion 8, and the winding 13 is wound with a gap or wound closely. By winding the winding 13 on the winding portion 8 with a gap provided therebetween, it is possible to prevent the Q value from deteriorating. By winding the winding 13 in close contact, the number of turns can be increased and the inductance can be increased. The winding 13 is preferably formed of at least one of conductive materials such as silver, silver alloy, copper, copper alloy, gold, gold alloy, aluminum, and aluminum alloy. In consideration of ease of handling and the like, it is preferable to use copper or a copper alloy.

Reference numerals 14 and 15 denote terminal portions provided on the flange portions 9 and 10, respectively. The terminal portions 14 and 15 are composed of terminal electrodes and a bonding layer.

As shown in FIGS. 3 and 4, the terminal electrode is composed of a base film 100 made of a conductive material on a base 7 and a conductive film formed on the base film 100 and made of a conductive material. 1
01a and the conductive film 10 laminated on the conductive film 101a
1b. In this case, in particular, the base film 100 is formed on the base 7 by electroless plating, or a conductive paste is applied on the base 7 and formed by baking, so that ceramic (alumina, ferrite, etc. ), The base film 100 can be easily formed on the base 7 composed of
By forming the conductive film 101a on the metal film 00 by electrolytic plating, a terminal electrode having a large thickness can be formed in a short time.

Further, the crushed end of the winding 13 is sandwiched between the conductive films 101a and 101b. At this time, at least the conductive film 101b is a material that does not melt at 260 ° C. (preferably 300 ° C.) (having a melting point of 260 ° C.).
Above). That is, the conductive film 101b is preferably formed of a metal material having a melting point of 260 ° C. or higher, preferably 300 ° C. or higher. With such a configuration, the ends of the winding 13 are connected to the conductive film 101a and the conductive film 101b.
, The joining strength is greatly increased, and the probability of the winding 13 falling off from the terminal portions 14 and 15 is extremely reduced. Note that in this embodiment, both the conductive films 101a and 101b are
It was composed of a material that did not melt at 60 ° C.

Further, by forming the conductive film 101b from a material which does not melt at 260 ° C. (preferably 300 ° C.), the conductive film 101b is usually heated at a temperature at which the bonding material for bonding electronic parts and the like to a circuit board or the like melts. Is configured to be difficult to melt, so even if it is heat-treated by reflow or the like,
The winding 13 does not come off.

In the present embodiment, the terminal electrodes are composed of three layers (the base film 100, the conductive film 101a, and the conductive film 101b), but may be two layers or four or more layers. 2 terminal electrodes
In the case of using a single-layer structure, for example, the base film 100 and the conductive film 101a are formed of one conductive film, and the conductive film 101b is provided on the conductive film.
00 is unnecessary, the conductive film 101a is directly formed on the base 7.
And the conductive film 101b are sequentially stacked. When it is desired that the terminal electrode itself has weather resistance, when the substrate 7 is protected, or when the adhesion strength between the terminal electrode and the substrate 7 is improved, a multilayer film of three or more layers is used. preferable.

Underlayer 100, conductive film 101a, conductive film 1
As the constituent material of 01b, a conductive metal material such as copper, silver, and gold, a conductive alloy material such as a copper alloy, a silver alloy, and a gold alloy, and a material obtained by adding other elements to the conductive material are used. . In particular, forming silver or a silver alloy on the base film 100 by baking and forming the conductive film 101a on the base film 100 by electrolytic plating of copper or a copper alloy is extremely difficult in terms of productivity and cost. Advantageously, the bonding strength between the base 7 and the terminal electrode can be increased.

The conductive film 101a is made of silver, copper, silver alloy,
The conductive film 101b is preferably made of at least one of copper alloy, solder, tin, nickel, nickel alloy, gold, and gold alloy. The conductive film 101b is made of silver, copper, silver alloy, copper alloy, nickel, nickel alloy, gold, and gold. Alloy, tin-silver alloy, tin-bismuth alloy,
It is preferable to use at least one of tin-silver-bismuth. The conductive film 101b is made of at least one of a tin-silver alloy, a tin-bismuth alloy, and a tin-silver-bismuth alloy. We can supply very friendly electronic components.

In a particularly preferred embodiment,
As the base film 100, silver or a silver alloy is formed by baking or the like, and a conductive film 101a made of silver or a silver alloy is formed thereon by a plating method such as electrolytic plating.
Next, there is a configuration in which the winding 13 is joined to the conductive film 101a by thermocompression bonding or ultrasonic welding, and thereafter, the conductive film 101b is formed of copper or a copper alloy having a melting point of 260 ° C. or higher.

In this embodiment, the thickness of the base film 100 is 2 μm to 30 μm (more preferably, 2 μm to 30 μm).
10 μm), and 10 μm to 30 μm (more preferably 18 μm to 2 μm) for the conductive film 101 a.
2 μm), and 3 μm to 100 μm (more preferably 20 μm to 3 μm) for the conductive film 101 b.
0 μm).

A bonding layer is formed on the terminal electrode. This bonding layer becomes unnecessary when solder or the like for electrically connecting to the element is attached to the wiring pattern or the like. However, in general, to increase the bonding strength with the circuit board,
It is preferable to provide a bonding layer.

The bonding layer is composed of a corrosion-resistant layer 102 and a bonding surface layer 103. The bonding surface layer 103 is required at least as a bonding layer, and the corrosion-resistant layer 102 is provided as necessary and sometimes. Ni, T as the corrosion resistant layer 102
A metal having corrosion resistance such as i or palladium or an alloy thereof is formed by a plating method or the like. This corrosion resistant layer 1
By providing 02, the corrosion resistance of the terminal electrode can be dramatically improved. On the corrosion-resistant layer 102, a bonding surface layer 103 made of a conductive bonding material such as solder and formed by plating or the like is provided.

Reference numeral 16 denotes a protective material provided so as to cover almost all portions except the ends of the windings 13. The protective material 16 is made of a weather-resistant material such as epoxy resin. A resist can be used as a constituent material of the protective material 16. By using the resist, the protective material 16 can be easily formed, and the productivity is improved. Further, the protective material 16 can be made of an electrodeposited film made of a cationic or anionic resin, and by using the electrodeposited film, the protective material 16 can be formed on a large number of devices at once. Therefore, the productivity can be greatly improved.
By providing the protective material 16 so as to cover the windings 13 in this manner, it becomes easy to adsorb the element with the nozzle of the mounting machine, and furthermore, the windings 13 may be deformed or sometimes cut by the nozzle or the like. do not do. Note that by using an insulating material as the protective material 16, reliable insulation between the windings 13 can be performed. In addition, by using a resin material having a smooth surface as the protective material 16, the suction characteristics at the nozzle can be further improved, and mounting errors and the like can be suppressed. As described above, by adopting a configuration in which the protective member 16 is provided in a winding-type inductance element which has been unsuitable as a mounting component in the past, the mounting performance can be dramatically improved.

The protective member 16 may have a configuration in which a tube-shaped body made of a heat-shrinkable resin material is inserted into the base 7. With such a configuration, the dimensional accuracy can be greatly improved, the winding can be reliably protected, the process can be simplified, and the occurrence of defective products can be suppressed. As a specific method, first, a tube-shaped body having a diameter larger than that of the base 7 (the cross section is circular, square,
(An elliptical shape or the like) is made of a heat-shrinkable material, and the tubular body is inserted into the base 7 and heat-treated to shrink the tubular body, and the tubular body is securely provided on the base 7.

Next, the relationship between the winding 13 and the terminals 14, 15 will be described.

The winding 13 has a winding part 13a wound around the winding part 8 and a lead part 13b as shown in FIG. 5, and the winding part 13a and the lead part 13b are formed by a bending point G. Divided. The bending point G is formed by a winding portion 13a which is normally wound around the winding portion 8 and a leading portion 13 which is pulled out so as to join the winding 13 to terminal electrodes provided on the terminal portions 14 and 15.
b, and the bending angle θ2 at the bending point G is 2
By setting the angle to 0 ° to 90 ° (particularly preferably 35 ° to 55 °), the winding portion 13a is not loosened, and the joining between the lead portion 13b and the terminal portions 14 and 15 can be efficiently realized.

As shown in FIG. 6, the distance LV between the outer end of the winding portion 13a and the terminal electrodes provided on the terminal portions 14 and 15 is set to 80 μm or more, preferably 100 μm or more. By setting the interval LV to 80 μm or more, the eddy current generated at the terminal electrode causes Q
The value decreases, and the efficiency of the device can be prevented from lowering.
In some cases, providing an interval LV of 100 μm or more results in significant Q
The value can be prevented from lowering. In the above-mentioned prior art, there is only a description of providing a gap, and there is no description as to how much a gap is provided. In the present embodiment, as a result of various studies, it has been found that the interval LV is required to be 80 μm or more in consideration of the recent miniaturization of the element.

FIG. 7 is a graph showing the relationship between the frequency and the Q value. In FIG. 7, line A shows a case where the interval LV is 34.2 μm, and line B shows a case where the interval LV is 102.9 μm. As can be seen from this graph, the interval LV is 100
It can be seen that when the thickness exceeds μm, the Q value in a high frequency range becomes extremely high. As a result of the examination, as described above, the interval LV was set to 8
It has been confirmed that if the thickness is 0 μm or more, sufficient characteristics can be obtained.

The distance LV is the distance between the outer end of the winding portion 13a and the terminal electrode in the longitudinal direction of the element, and does not take into account the distance in the height direction of the element.

In most cases, the winding 13 is provided with an insulating film 13d around the conductor 13c. The above-mentioned space LV indicates the space between the outer end of the winding portion 13a and the end of the conductive wire portion 13c on the terminal electrode portion side.

Next, the tapered portions 11 and 12 will be described.

As described above, the means for providing the interval LV of 80 μm or more can also be achieved by optimizing the settings of the winding machine and the like, but sometimes the winding 13 becomes loose and the like.
The winding portion 13a may abnormally approach the terminal electrode, and the interval LV may be 80 μm or less.

In the present embodiment, the tapered portions 11 and 12
The abnormal approach of the winding part 13a to the terminal electrode can be prevented. That is, the tapered portions 11 and 12
Is provided, for example, the winding portion 13a of the winding 13
Even if the tapered portion is loosened, the tapered portions 11 and 12 also serve as stoppers, so that the winding portion 13a rarely comes into abnormal contact with the terminal electrode, so that the interval LV is set to 80 μm or more. . At this time, the length LX of each of the tapered portions 11 and 12 is formed to be 90 μm or more, preferably 100 μm or more. With such a configuration, even if the diameter of the winding 13 is changed within a usable range,
The interval LV can be sufficiently set to 80 μm or more.

Further, as shown in FIG.
It is preferable that the formation angle θ1 of 1 and 12 is 100 degrees to 170 degrees, more preferably 110 degrees to 130 degrees. By specifying the formation angle θ1 in this manner, the tapered portions 11, 12 and the winding portion 8, and the terminal portions 14,
No sharp corners are formed at the boundary with the projection 15, and it has a sufficient function as a stopper.

Further, the relationship between the step LW between the terminal portions 14 and 15 and the winding portion 8 and the diameter d of the winding 13 is preferably 0.5 × step LW <diameter d <0.98 × step LW. With such a relationship, the interval LV can be sufficiently set to 80 μm or more.

Next, a method of manufacturing the inductance element will be described.

First, the base 7 is manufactured by dry pressing or extrusion. At this time, when the base body 7 is manufactured by an extrusion method or the like, the winding portion 8 and the flange portions 9 and 10 are manufactured using a cutting process or the like. Next, the base film 1 is formed on the entire surface of the flange 9 (four side surfaces 9a and one end surface 9b in the present embodiment).
After that, a conductive film 101a is formed on the base film 100 by electrolytic plating or the like. At this time, the base film 100 and the conductive film 101a are formed on the entire surface of the flange 9, but may be formed only on the side surface 9a, may be formed only on the end surface 9b, or may be formed on a part of the side surface 9a in a ring shape. The flange 10 can also take various forms in consideration of the Q value and the mountability, and the like. The entire surface of the flange 10 (in this embodiment, four side surfaces 10a and one end surface 1a).
0b), a base film 100 is formed.
A conductive film 101a is formed thereon by electrolytic plating or the like.

Next, the winding 13 is wound around the winding portion 8. At this time, the number of turns is determined in consideration of the inductance of the element and the like. Further, in order to improve the Q value, a gap can be provided between the windings 13 to improve the Q value. Further, at this time, the base film 100 and the conductive film 101a are formed.
It is preferable that a predetermined interval is provided between the winding 13 and the end of the winding 13 except for the end portion.

Next, the end of the winding 13 and the conductive film 101a are joined by thermocompression bonding or the like. The winding 13 and the conductive film 101a
In addition, laser welding, spot welding, bonding with a conductive adhesive (solder, conductive resin), or the like can be used for bonding.

Next, a protective material 16 is provided on the winding 13.
At this time, the protective material 16 is provided so that at least the terminal portions 14 and 15 are exposed. At this time, when a tubular body made of a heat-shrinkable material is used as the protective material 16, the tubular body is inserted into the substrate 7 and then heat-treated to shrink the tubular body.

Next, by a plating method such as electrolytic plating, 26
The conductive film 101b is formed of a material that does not melt at 0 ° C., and covers the joint between the winding 13 and the conductive film 101a. With such a configuration, the joint between the winding 13 and the conductive film 101a is covered with a material having a high melting point, so that even if heat is applied, the winding 13 does not easily come off, and the joining strength is very high. can do. The winding 13 and the conductive film 1
01a is covered with the conductive film 101b,
Since the step can be reduced by the joint, when the device is mounted on a circuit board or the like, the seating of the device is improved and the mountability is improved.

When the bonding layer is not required, the steps up to here may be sufficient, but when the bonding layer is required, the following steps are required.

First, a corrosion resistant layer 102 is formed of a corrosion resistant material such as Ni or Ti by a plating method or a sputtering method.
A bonding surface layer 103 made of a conductive bonding material such as solder or lead-less solder is formed on the corrosion-resistant layer 102 by plating or the like. In the case of the present embodiment, a bonding layer is formed by the corrosion-resistant layer 102 and the bonding surface layer 103. Note that, as the bonding layer, the corrosion-resistant layer 102 can be omitted depending on the use environment or the like, and therefore, at least the bonding surface layer 103 is required.

By providing this bonding layer on the terminal electrode, the winding 13 can surely increase the bonding strength with the terminal electrode. In this way, the terminal portion 14, the joint electrode and the terminal portion 14,
15 are formed, and the device is completed.

In the present embodiment, the cross-sectional shapes of the flanges 9 and 10 and the winding portion 8 are configured to be substantially square, but are configured to be substantially regular polygons such as regular pentagons and regular hexagons. Or a substantially circular shape. That is, any cross-sectional shape having no directionality when the element is mounted on the circuit board may be used.

The sizes of the elements described above (the height P1, the width P2, and the length P3 shown in FIG. 1) are preferably set in the following ranges.

0.4 mm <P1 <1.2 mm (preferably 0.7 mm <P1 <1.2 mm) 0.4 mm <P2 <1.2 mm (preferably 0.7 mm
<P2 <1.2 mm) 0.9 mm <P3 <2.0 mm (preferably 1.5 mm
<P3 <2.0 mm) If P1 and P2 are 0.4 mm or less, the mechanical strength of the base 7 is weakened, so that the element may be broken at the time of winding, and the winding 13 may be wound. Since the diameter becomes small and a predetermined characteristic cannot be obtained, and furthermore, the winding 13 is sharply bent, so that the winding 13 is easily damaged and the coating 13d is easily peeled off. . If P1 and P2 are equal to or larger than 0.7 mm, the probability that the above-described problem occurs further decreases. Also, P1,
If P2 is 1.2 mm or more, the element itself becomes too large, the mounting area becomes large, and the circuit board and the like cannot be miniaturized, and the device cannot be miniaturized. If P3 is 0.9 mm or less, the winding 13
The number of turns of the winding 13 is limited, so that a predetermined inductance cannot be obtained. In addition, if the number of turns of the winding 13 is to be increased, the diameter of the winding 13 must be reduced. As a result, the winding 13 breaks when the winding 13 is moved to the base 7. Note that if P3 is 1.5 mm or more, the probability of the occurrence of the above-described problem is further reduced. On the other hand, if P3 is 2.0 mm or more, the element itself becomes too large, the mounting area becomes large, and it is not possible to reduce the size of a circuit board or the like, and thus it is not possible to reduce the size of the device.

Hereinafter, the features of this embodiment will be described.

In the case of the present embodiment, the outermost layer of the terminal electrode is the bonding surface layer 103, which is almost silver or white. Although not shown, in the present embodiment, the base 7 is exposed between the protective material 16 covering the winding portion 13 and the terminal electrode.
The color of both the protective material 16 and the base 7 is different from the color of the outermost layer of the terminal electrode. Specifically, the color of the protective material 16 is black,
By making the color of at least the surface of the base 7 black, the outermost layer of the terminal electrode is silver or white, and the other portions are black, so that it is possible to make a good determination when inspecting the width of the terminal electrode formed by image recognition. , And productivity is improved. In the present embodiment, the protective material 16 and the base 7 are of the same color, but may be different from the color of the outermost layer of the terminal electrode. Further, in the present embodiment, although the base 7 and the protective material 16 are black,
As long as the color is different from the color of the terminal electrode outermost layer, a color such as red, blue, or green may be used.

When the base 7 is to be colored, a predetermined additive or coloring agent may be mixed into the base 7, but the addition of the additive or the like significantly deteriorates the characteristics of the base 7. In this case, it is preferable to provide a paint of a predetermined color on the surface of the base 7.

[0057]

According to the present invention, there is provided a base, a winding wound around the base, a terminal electrode provided on the base and joined to the winding, and a protective material covering the winding . The terminal
An inductance element in which the base is exposed between a pole and the protective material , and the terminal electrode can be easily determined by making the color of the terminal electrode outermost layer different from the color of the base and the protective material, Productivity can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an inductance element according to an embodiment of the present invention.

FIG. 2 is a perspective view showing only a base of the inductance element according to the embodiment of the present invention;

FIG. 3 is a partial cross-sectional view showing an inductance element according to one embodiment of the present invention.

FIG. 4 is a partial cross-sectional view showing an inductance element according to one embodiment of the present invention.

FIG. 5 is a partial plan view showing an inductance element according to one embodiment of the present invention.

FIG. 6 is a partial cross-sectional view showing an inductance element according to one embodiment of the present invention.

FIG. 7 is a graph showing a relationship between a frequency and a Q value.

FIG. 8 is a partial cross-sectional view showing an inductance element according to one embodiment of the present invention.

FIG. 9 is a perspective view showing a conventional inductance element.

[Explanation of symbols]

 7 Substrate 8 Winding part 9,10 Flange part 13 Winding 14,15 Terminal part 16 Protective material 100 Base film 101a Conductive film 101b Conductive film 102 Corrosion resistant layer 103 Bonding surface layer

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenzo Isozaki 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-11-40424 (JP, A) JP-A-10- 125536 (JP, A) JP-A-10-189344 (JP, A) Registered utility model 3049201 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01F 17/00-17/08 H01F 27/28-27/32 H01F 41/00-41/10

Claims (4)

(57) [Claims] And 1. A substrate, a winding wound on the base body, the terminal electrodes to be joined to the winding is provided on the substrate, and a protective member for covering the winding, and the terminal electrode Said protection
An inductance element in which the base is exposed between materials, wherein the color of the outermost layer of the terminal electrode is different from the colors of both the base and the protective material. 2. The inductance element according to claim 1, wherein the base and the protective material have the same color. 3. The inductance element according to claim 2, wherein the color of the base and the protective material is black. The height P1, width P2, and length P3 of the element are set as follows: 0.4 mm <P1 <1.2 mm 0.4 mm <P2 <1.2 mm 0.9 mm <P3 <2.0 mm The inductance element according to claim 1, wherein: