JP2010171245A - Inductance element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inductance element small in dispersion of a damping characteristic by reducing degradation of the damping characteristic of a product. <P>SOLUTION: The inductance element is made by forming it so that the upper limit of a looseness distance 10 between the upper surface of a conductor 4 and an outer surface of a coil 7 on the conductor 4 side that is vertical to the surface of the conductor 4 is set within 1.5 mm from the upper surface of the conductor 4 by using, as the lower limit, the thickness of a dielectric material 5 on the conductor 4 that is arranged by being tightly fitted to the upper surface of the conductor 4. The inductance element can be formed even when an aluminum wire or a copper clad aluminum wire with the surface of aluminum covered with copper is used for a covering conductive wire 6. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an inductance element for mainly preventing electrical noise (hereinafter referred to as noise) propagating through a power supply line or the like.

Electronic devices such as personal computers and thin LCD TVs are designed to suppress the noise generated and propagated by themselves, and to avoid the influence of noise generated by other devices. It is defined by various standards such as the Radio Law and CISPR.
For this reason, the power supply unit of an electronic device having a noise problem is provided with an inductance element for complying with various standards, a noise filter using the inductance element, and the like.

In general, noise is a mixture of balanced (hereinafter referred to as common) mode noise and unbalanced (hereinafter referred to as normal) mode noise.
Common mode noise flows between an input / output line and a substrate ground, a casing, the ground, or the like. For example, a potential difference is generated between the ground and the input / output line.
The normal mode noise is an unwanted potential difference between the input / output line and the load.

FIG. 4 is an equivalent circuit of a general noise filter. A general noise filter 20 shown in FIG. 4 is configured such that one terminal is grounded to an inductance element 1 having impedance, reactance, and mutual inductance having a high coupling coefficient, which interrupts and attenuates common mode noise, and a ground 21 of the substrate. A pair of capacitors 22 that circulate and cancel the common mode noise, a normal mode choke coil 23 having impedance and reactance that blocks and attenuates the normal mode noise, and a capacitor 24 and a capacitor 25 that circulate and cancel the normal mode noise. It consists of and.
The power source 26 is assumed to be a commercial AC power source, the ground 21 is assumed to be grounded to a ground such as a housing, and the load 27 is assumed to be an electronic device having a load that generates noise. ing.

As the above-described inductance element, a magnetic core having soft magnetic characteristics is electrically grounded, and a coil is formed by winding a coated conductor having an electrically insulating film directly on the grounded magnetic core to form a coil. There has been proposed an inductance element that becomes a distributed constant filter using a capacitance generated in a distributed constant between the core and the coil and an inductance induced by the magnetic core and the coil.
Such an inductance element is disclosed in Patent Document 1 and Patent Document 2, for example.

On the other hand, in order to easily adjust the capacitance between the grounds, a conductive conductor grounded to the ground is provided on the magnetic core on which the coil is disposed, and a dielectric is disposed on the conductor, and the dielectric There has been proposed an inductance element that utilizes a capacitance generated between a conductor and a nearby conductor by arranging and laminating a coil and a nearby conductor adjacent to the body.
Such an inductance element is disclosed in Patent Document 3, for example.

5A and 5B are diagrams for explaining a conventional inductance element. FIG. 5A is a front view, FIG. 5B is a side view, and FIG. 5C is a plan view of FIG. It is sectional drawing cut | disconnected by -L.
The inductance element 1a is a foil-like conductor provided outside the insulating case 3 by forming a toroidal magnetic core 2 in an insulating case 3 using an electrically insulating resin and forming an annular assembly. 4, a sheet-like dielectric 5 provided so as to cover the conductor 4, a conductive ground terminal 9 connected to the conductor 4, and a coil 7 formed by winding the covered conductor 6. And the dielectric 5 disposed in contact with or close to at least a part of the coil 7 and the conductor 7 that forms capacitance with the coil 7 and the dielectric 5. Forming.
Each terminal of the coil 7 is provided with the mounting terminals 8a, 8b, 8c, and 8d by peeling off the insulating film of the coated conductor 6 and applying solder plating or the like for connection to a substrate or the like by soldering. ing.

  By forming the inductance element in this way, it is possible to add a large capacitance generated by the dielectric 5 having a high degree of design freedom. The dielectric 5 is used to electrically connect the conductor 4 and the coil 7. This is a distributed constant type filter that has improved electrical reliability by being insulated, and has a wide range of noise attenuation characteristics up to a high frequency range of several tens of MHz. An inductance element 1a shown in FIG. 5 is disclosed in Patent Document 4, for example.

JP 09-102426 A JP 2004-31866 A JP 2004-235709 A JP 2008-118101 A

  However, the conventional inductance element 1a as shown in FIG. 5 has a problem that the quality of the product is deteriorated due to variations in noise attenuation characteristics (hereinafter simply referred to as attenuation characteristics) due to this element.

  A technical problem of the present invention is to provide an inductance element having a small variation in attenuation characteristics by reducing a decrease in attenuation characteristics of a product.

  As one of the causes of the variation in the attenuation characteristics described above, the inventors have formed a coil by winding a coated conductor around the outer surface of an assembly including a magnetic core, a conductor, a dielectric, and a ground terminal. The present inventors have found that a gap is generated by loosening a conductor wound between an upper surface of a dielectric on a conductor and a coil formed by winding a coated conductor.

  As a result of the gap, the capacitance generated between the conductor and the coil across the dielectric is reduced, and the influence of the capacitance generated between the adjacent coated conductors of the coil is relatively increased. It was assumed that the attenuation characteristics would decrease or vary.

  Since the coil is formed by winding an elastic coated conductor such as a copper wire, it is used for working methods among workers, pulling conditions applied to the coated conductor, folding position when the coated conductor is wound, and winding. It has been found that the degree of slackness of the coated conductor of the formed coil differs depending on the influence of the jig or the like.

  The inventors have determined that the slack distance between the upper surface of the conductor and the outer surface of the coil on the conductor side at a position perpendicular to the surface of the conductor includes the thickness of the dielectric. It has been found that when the distance exceeds 1.5 mm from the upper surface, −40 dB, which is the target of the lower limit of the attenuation characteristic in the frequency range from 300 kHz to 10 MHz, may be interrupted.

  Therefore, the present invention reduces the attenuation characteristics in the frequency range of 300 kHz to 10 MHz by setting the slack distance with respect to the upper surface of the conductor as the lower limit of the dielectric thickness and the upper limit within 1.5 mm. Therefore, it is possible to supply a high quality inductance element to the customer.

The coated conductor can also be formed by using an aluminum wire or a copper clad aluminum wire whose surface is covered with copper.
Since an aluminum wire or a copper clad aluminum wire has a lower elastic modulus than a copper wire, it is possible to form a coil with less slack caused by winding it under the same conditions as a copper wire to form a coil.

  According to the present invention, an annular magnetic core having soft magnetic properties, an insulating case capable of covering the outer surface of the magnetic core with an electrically insulating material, a conductive sheet-like conductor, An inductance element comprising an electrically insulating sheet-like dielectric, a ground terminal made of a conductive metal rod, and a coated conductor having an electrically insulating film, wherein the magnetic core is housed in the insulating case Forming an annular assembly, disposing the conductor connected to one end of the ground terminal on the outer surface of the assembly, and further disposing the dielectric on the conductor. The coated conductor is wound to form a coil, the winding start and end terminals of the coil are formed as connection terminals that can be electrically connected to the outside, and the upper surface of the conductor and the surface of the conductor are formed. The guide that is vertically above Slack distance between the outer surface of the coil body side, the dielectric thickness above, the inductance element is obtained, characterized in that is within 1.5 mm.

  According to the present invention, there is obtained an inductance element characterized in that an aluminum wire or a copper clad aluminum wire is used for the coated conductor.

  According to the present invention, it is possible to reduce the deterioration of the attenuation characteristic of the product, and it is possible to provide an inductance element with little variation in the attenuation characteristic.

The figure explaining the inductance element of this invention. FIG. 1A is a front view. FIG. 1B is a side view. FIG.1 (c) is JJ sectional drawing of FIG.1 (b). FIG.1 (d) is the elements on larger scale of the KK cross section of Fig.1 (a). The attenuation characteristic in the common mode choke coil of the inductance element of the Example of this invention and a comparative example. Fig. 5 shows attenuation characteristics of a common mode choke coil of an inductance element according to an embodiment of the present invention. Equivalent circuit for general noise filter. The figure explaining the conventional inductance element. FIG. 5A is a front view. FIG. 5B is a side view. FIG.5 (c) is LL sectional drawing of Fig.5 (a).

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

1A and 1B are diagrams illustrating an inductance element according to the present invention. FIG. 1A is a front view, FIG. 1B is a side view, and FIG. 1C is a view in FIG. FIG. 1D is a partial enlarged view of the KK cross section of FIG. 1A.
The inductance element 1 of the present invention includes a magnetic core 2, an insulating case 3, a conductor 4, a dielectric 5, a covered conductor 6, and a ground terminal 9.

The magnetic core 2 has soft magnetic properties and is formed in a toroidal shape. The magnetic core 2 may be any magnetic material having a high magnetic permeability, such as a ferrite material that is a sintered body of Mn—Zn or Ni—Zn iron oxide, or a metal material such as amorphous or permalloy. It is preferable to select appropriately according to required characteristics, such as a powdered material such as iron alloy powder.
The shape of the magnetic core 2 is not limited to a toroidal shape, and may be any shape as long as it can be a shape having one closed magnetic path, and may be appropriately selected from a circular shape, an oval shape, an elliptical shape, a rectangular shape, and the like. Further, the cross-sectional shape of the magnetic path may be appropriately selected from square, circle, ellipse, oval, polygon, and the like.

The magnetic core 2 is housed in an insulating case 3 obtained by molding and processing an electrically insulating resin, and forms a toroidal built-in body covered with the electrically insulating resin.
The insulating case 3 may be made of any material as long as it is a resin that covers the magnetic core 2 while being electrically insulated from the outside, such as an epoxy-based or phenol-based thermosetting resin, polypropylene (PP), polystyrene (PS), Polybutylene terephthalate (PBT), nylon thermoplastic resin, or the like may be selected as appropriate.
Moreover, it is not limited to the above-mentioned resin molded body, but may be formed around the magnetic core 2 up to a predetermined thickness using insulating paper, insulating tape, insulating paint, or the like.

A conductor 4 made of a conductive metal foil is disposed on the outer peripheral surface of the built-in body.
The conductor 4 may be formed so as not to produce a short ring effect that cancels the magnetic flux generated in the magnetic core. For example, the conductor 4 is divided into a line by one ridge line of the toroid and covers all other outer surfaces. It may be formed.
The conductor 4 is formed symmetrically about the line 15 that bisects the inductance element, and the inductance generated by the left and right coils 7 formed by winding the coated conductor 6 symmetrically with respect to the same axis. The capacitance can be formed equally, which is preferable.

  The conductor 4 may be any of a film shape, a plate shape, a lattice shape, a mesh shape, or the like that has conductivity and can be disposed along a curved surface, for example, a conductive metal. A foil may be disposed, or a conductive metal vapor-deposited film, a sputtered film, a plated film, or the like may be formed, or a conductive material such as carbon may be printed and disposed. A conductive adhesive may be applied.

On the upper surface of the conductor 4, a sheet-like dielectric 5 having a relative dielectric constant is disposed so as to cover and cover the upper surface of the conductor 4.
The dielectric 5 may be formed so as to cover the entire outer surface of the assembly including the conductor 4.
The dielectric 5 may be any resin as long as it is an electrically insulating resin. However, the dielectric 5 can be used in accordance with any curved surface shape for work and has a high relative dielectric constant. For example, a film-like sheet formed of a general-purpose resin such as silicone rubber or polyethylene terephthalate (PET), which is a flame-retardant material having a large dielectric constant and a wide use temperature range. It is preferable to use it.
Note that the thickness of the dielectric 5 is preferably adjusted as appropriate in consideration of the desired capacitance.

  The conductor 4 is integrated with the dielectric 5 by a processing method such as vapor deposition, sputtering, plating, printing, or application of a conductive conductor on one surface of a polyethylene terephthalate (PET) film or the like that becomes the dielectric 5. Can be formed. Conversely, a film of the dielectric 5 may be formed on a copper foil or the like that becomes the conductor 4.

The ground terminal 9 is formed so that one of the conductive bars can be electrically connected to the conductor 4 by soldering or electric welding, and the other can be soldered to the ground surface or the like of the substrate.
The ground terminal 9 may be formed using a conductor having a small specific resistance so as to have a low direct current resistance and a low impedance in a high frequency region, and may be appropriately selected from a rod shape, a plate shape, a wire shape, and the like.

The coated conductor 6 is coiled so that the magnetic flux generated in the magnetic core 2 is wound around the outer surface of the assembly including the conductor 4, the dielectric 5, and the ground terminal 9 and circulates in the closed magnetic path of the magnetic core 2. 7 is formed.
Note that the left and right coils 7 are formed so as to be effective against common mode noise by being formed to face each other so that magnetic fluxes generated from each other cancel each other.
Terminals at the beginning and end of winding of the coil 7 are subjected to solder plating so as to be electrically connected to the outside, thereby forming mounting terminals 8a, 8b, 8c and 8d, respectively.

  The coated conductor 6 is a polyurethane-coated copper wire (UEW), a polyester-coated copper wire (PEW), or a polyamide-imide-coated copper wire (AIW) formed by baking a resin such as polyurethane, polyester, or polyamideimide on the outer periphery of the linear copper. Or a PVC-coated copper wire using polyvinyl chloride (PVC) with higher electrical insulation as a film.

  The coil 7 closely contacts the upper surface of the conductor 4 with a slack distance 10 between the upper surface of the conductor 4 and the outer surface of the coil 7 on the conductor 4 side located at a position perpendicular to the surface of the conductor 4. The upper limit of the thickness of the dielectric 5 on the conductor 4 is set within 1.5 mm from the upper surface of the conductor 4.

The inductance element 1 is formed by forming the slack distance 10 within 1.5 mm so that the upper surface of the dielectric 5 on the conductor 4 and the outer surface of the coil 7 on the conductor 4 side are in close contact with each other. Thus, in the frequency region before the resonance phenomenon occurs, the attenuation characteristic can be reduced within −10 dB.
Similarly, by forming the slack distance 10 within 1 mm, the resonance phenomenon is compared with the case where the upper surface of the dielectric 5 on the conductor 4 and the outer surface of the coil 7 on the conductor 4 side are in close contact with each other. In the frequency region before the occurrence of, the attenuation characteristic can be reduced within -5 dB.

As the conductive material of the coated conductor 6, the coated conductor is wound by using aluminum having a low elastic modulus other than copper or a copper clad aluminum wire whose surface is covered with copper as compared with the case of using a copper wire. It is formed in the inductance element 1 having a short slack distance 10 generated when it is turned.
Therefore, variation in attenuation characteristics can be suppressed by using aluminum or a copper clad aluminum wire.

  The inductance element in the above-described embodiment bisects the coated conductors so that the magnetic flux generated in the magnetic path of the magnetic core is bisected in a semi-annular shape for the common mode, that is, the toroidal magnetic core. Each coil is wound around a magnetic path to form two coils that are symmetric with respect to the axis that bisects the magnetic core. It can also be applied to a common mode inductance element that is used for a three-phase power source or the like and has three or more coils.

  Hereinafter, the present invention will be described using examples.

Example 1
The magnetic core 2 has an outer diameter of 25 mm, an inner diameter of 15 mm, a height of 12 mm, a toroidal shape having a rectangular cross section, and an Mn—Zn ferrite core having an initial permeability of about 10,000 at a frequency of 100 kHz (FR25 / 15 / manufactured by NEC TOKIN). 12-10H material).

  As the insulating case 3, the magnetic core 2 is housed in an outer shape of 27mm, an inner diameter of 13mm, a height of 14mm, and a shape in which the minimum thickness of each part is 0.5mm and molded into a toroidal shape using polypropylene resin. An embedded body was formed.

  As the conductor 4, a copper foil having a thickness of 80 μm, a width of 10 mm, and a length of 80 mm is arranged on the outer peripheral surface of the insulating case 3 in which the magnetic core 2 is housed so as to be symmetrical about the line 15 that bisects the inductance element. did.

  As the dielectric 5, a silicon sheet having a thickness of 0.5 mm, a width of 15 mm, and a length of 100 mm was used to cover the conductor 5.

  The ground terminal 9 was pulled out by soldering and connecting one of the copper wires having a wire diameter of 0.3 mm to the substantially center of the conductor 4, and the other was pulled out by solder plating.

  As the coated conductor 6, a polyurethane-coated copper wire (UEW) having a copper wire diameter of 1 mm was used.

The coil 7 was formed by winding a built-in assembly including the conductor 4, the dielectric 5, and the ground terminal 11 by using the covered conductive wire 6 so as to be in close contact with the upper surface of the dielectric 5 by 31 turns.
Since the coils 7 are formed so that the magnetic fluxes generated from each other cancel each other, one coil is wound in the opposite direction so as to be symmetrical about the line 15 that bisects the inductance element, and the frequency is 100 kHz. Each inductance was formed so as to be 10 mH.

  Each terminal of the coil 7 is peeled off from the covering conductor 6 and solder-plated so that the connection can be easily made by soldering or the like, and one mounting terminal 8a, 8d at the beginning of winding and the other at the end of winding. Mounting terminals 8b and 8c are provided to form the inductance element 1 shown in FIG.

  By forming as described above, the slack distance 10 between the upper surface of the conductor 4 and the outer surface of the coil 7 on the conductor 4 side perpendicular to the surface of the conductor 4 is 0.5 mm. That is, an example in which the slack distance 10 of Example 1 in which the outer surface of the coil 7 on the conductor 4 side is closely attached to the upper surface of the dielectric 5 having a thickness of 0.5 mm on the conductor 4 is 0.5 mm. 1 inductance element was produced.

(Example 2)
Using the same member as in the first embodiment, the slack distance 10 is 1 mm, that is, the upper surface of the dielectric 5 having a thickness of 0.5 mm on the conductor 4 and the outer surface of the coil 7 on the conductor 4 side. The inductance element of Example 2 was produced so as to have a space with a gap of 0.5 mm.
The slack distance 10 in this case is such that the upper surface of the dielectric 5 having a thickness of 0.5 mm is covered with a spacer (not shown) having a thickness of 0.5 mm, and the outer surface of the coil 7 on the conductor 4 side is in close contact with the upper surface of the spacer. The coil was wound to form a coil, and then the spacer was removed to form the coil.

(Example 3)
Using the same member as in the first embodiment, the slack distance 10 is 1.5 mm, that is, the upper surface of the dielectric 5 having a thickness of 0.5 mm on the conductor 4 and the outer surface of the coil 7 on the conductor 4 side. The inductance element of Example 3 was manufactured so as to have a space of 1 mm.
The slack distance 10 in this case is such that the outer surface of the coil 7 on the side of the conductor 4 is in close contact with the upper surface of the spacer by covering the upper surface of the dielectric 5 having a thickness of 0.5 mm with a spacer (not shown) having a thickness of 1 mm. After forming the coil by winding the wire, the spacer was removed to form the coil.

(Comparative Example 1)
Using the same member as in the first embodiment, the slack distance 10 is 2 mm, that is, the upper surface of the dielectric 5 having a thickness of 0.5 mm on the conductor 4 and the outer surface of the coil 7 on the conductor 4 side. The inductance element of Comparative Example 1 was manufactured so as to have a space of 1.5 mm between.
The slack distance 10 in this case is such that the upper surface of the dielectric 5 having a thickness of 0.5 mm is covered with a spacer (not shown) having a thickness of 1.5 mm, and the outer surface of the coil 7 on the conductor 4 side is in close contact with the upper surface of the spacer. The coil was wound to form a coil, and then the spacer was removed to form the coil.

(Comparative Example 2)
Using the same member as in the first embodiment, the slack distance 10 is 2.5 mm, that is, the upper surface of the dielectric 5 having a thickness of 0.5 mm on the conductor 4 and the outer surface of the coil 7 on the conductor 4 side. The inductance element of Comparative Example 1 was manufactured so as to have a space of 2 mm.
In this case, the slack distance 10 is such that the outer surface of the coil 7 on the conductor 4 side is in close contact with the upper surface of the spacer by covering the upper surface of the dielectric 5 with a thickness of 0.5 mm with a spacer (not shown) with a thickness of 2 mm. After forming the coil by winding the wire, the spacer was removed to form the coil.

FIG. 2 shows the attenuation characteristics of the common mode choke coil of the inductance element according to the embodiment of the present invention and the comparative example.
FIG. 2 shows an inductance element having a slack distance of 0.5 mm, 1 mm, and 1.5 mm according to Examples 1 to 3 of the present invention manufactured as described above, and a slack distance according to Comparative Examples 1 and 2 is 2.0 mm. The attenuation characteristics as a common mode choke coil with an inductance element of 2.5 mm are shown.

  According to the result of FIG. 2, the inductance element of the embodiment according to the present invention has a smaller decrease in the attenuation characteristic in the region of the frequency of 10 MHz or less where the influence of the LC resonance is less than the inductance element of the comparative example in which the slack distance is increased. We were able to.

  The attenuation characteristic at a frequency of 10 MHz of the inductance element in which the slack distance in Example 1 was 0.5 mm was 41.5 dB.

The attenuation characteristic at the frequency of 10 MHz of the inductance element in which the slack distance in Example 2 was 1 mm was 42.5 dB increased by 1 dB.
Moreover, compared with the inductance element of Example 1, the frequency characteristic was equivalent to the attenuation characteristic, and was kept in the range of −5%.

The attenuation characteristic at the frequency of 10 MHz of the inductance element in which the slack distance in Example 3 was 1.5 mm was 41 dB of −0.5 dB.
Also, compared with the inductance element of Example 1, the difference in attenuation characteristics from 7 MHz to 8 MHz where the maximum difference occurred was within −4 dB, and was within the range of −10%.

The attenuation characteristic at a frequency of 10 MHz of the inductance element in which the slack distance in Comparative Example 1 was 2 mm was −3.5 dB of −8 dB.
In addition, compared with the inductance element of Example 1, the difference in attenuation characteristics at 9 MHz where the maximum difference occurred was −8.5 dB, which was not within the target range of −10%.

The attenuation characteristic at a frequency of 10 MHz of the inductance element in which the slack distance of Comparative Example 2 was 2.5 mm was 29.5 dB of −12 dB.
In addition, compared with the inductance element of Example 1, the difference in attenuation characteristics at 10 MHz where the maximum difference occurred was -12 dB, which was not within the target range of -10%.

Example 4
Using the same member that differs from the first embodiment only in the covered conductor 6, the slack distance 10 is 1 mm, that is, the upper surface of the dielectric 5 having a thickness of 0.5 mm on the conductor 4 and the coil 7 on the conductor 4 side. The inductance element of Example 4 was manufactured so as to have a space of 0.5 mm between the outer surface of each.
For the coated conductive wire 6 of Example 4, a copper wire having a diameter of 1.3 mm on which an insulating film of polyurethane was formed was used.
The slack distance 10 in this case is such that the upper surface of the dielectric 5 having a thickness of 0.5 mm is covered with a spacer (not shown) having a thickness of 0.5 mm, and the outer surface of the coil 7 on the conductor 4 side is in close contact with the upper surface of the spacer. The coil was wound to form a coil, and then the spacer was removed to form the coil.

(Example 5)
Using the same member that differs from the above-described Example 4 only in the covered conductor 6, the slack distance 10 is 1 mm, that is, the upper surface of the dielectric 5 having a thickness of 0.5 mm on the conductor 4 and the conductor 4 side. The inductance element of Example 5 was manufactured so as to have a space of 0.5 mm between the outer surface of the coil 7.
As the coated conductor 6 of Example 5, an aluminum wire having a diameter of 1.3 mm on which a polyurethane insulating film was formed was used.
The slack distance 10 in this case is such that the upper surface of the dielectric 5 having a thickness of 0.5 mm is covered with a spacer (not shown) having a thickness of 0.5 mm, and the outer surface of the coil 7 on the conductor 4 side is in close contact with the upper surface of the spacer. The coil was wound to form a coil, and then the spacer was removed to form the coil.

(Example 6)
Using the same member that differs from the fourth embodiment only in the covered conductor 6, the slack distance 10 is 1 mm, that is, the upper surface of the dielectric 5 having a thickness of 0.5 mm on the conductor 4 and the coil 7 on the conductor 4 side. The inductance element of Example 6 was manufactured so as to have a space of 0.5 mm between the outer surface of each.
A copper clad aluminum wire having a diameter of 1.3 mm on which a polyurethane insulating film was formed was used for the coated conductor 6 of Example 5.
The slack distance 10 in this case is such that the upper surface of the dielectric 5 having a thickness of 0.5 mm is covered with a spacer (not shown) having a thickness of 0.5 mm, and the outer surface of the coil 7 on the conductor 4 side is in close contact with the upper surface of the spacer. The coil was wound to form a coil, and then the spacer was removed to form the coil.

FIG. 3 shows attenuation characteristics of the common mode choke coil of the inductance element according to the embodiment of the present invention.
FIG. 3 shows an inductance element of Example 4 using an aluminum wire with a diameter of 1.3 mm, in which the slack distance according to Examples 4 to 6 of the present invention produced as described above is 1 mm, and a diameter of 1.3 mm. The attenuation characteristics in the common mode choke coil of the inductance element of Example 5 using a copper clad aluminum wire and the inductance element of Example 6 using a copper wire having a diameter of 1.3 mm are shown.

The attenuation characteristics when the frequencies of the inductance elements of Example 4 were 3 MHz, 5 MHz, and 10 MHz were 47.6 dB, 43.5 dB, and 44.2 dB, respectively.
The attenuation characteristics when the frequency of the inductance element of Example 5 is 3 MHz, 5 MHz, and 10 MHz are 46.3 dB, 44.2 dB, and 43.9 dB, respectively. Characteristics were obtained.
The attenuation characteristics when the frequency of the inductance element of Example 6 is 3 MHz, 5 MHz, and 10 MHz are 46.9 dB, 43.9 dB, and 44.1 dB, respectively, which are equivalent to the frequency of the inductance element of Example 4. Characteristics were obtained.

According to the results of FIG. 3, the inductance element of Example 5 using an aluminum wire having a diameter of 1.3 mm for the coated conductor 6 according to the present invention, and an implementation using a copper clad aluminum wire having a diameter of 1.3 mm for the coated conductor 6. In comparison with the inductance element of Example 4 in which the inductance element of Example 6 was a copper wire having a diameter of 1.3 mm as the coated conductor 6, an equivalent attenuation characteristic was obtained.
Thus, it was found that even if the material of the coated conductor 6 is changed, if the slack distance is constant, the attenuation characteristics are equivalent.
Therefore, it was found that the inductance element of the present invention can be formed even when an aluminum wire or a copper clad aluminum wire having a low elastic modulus is used for the coated conducting wire 6 forming the coil 7.

The embodiments of the present invention have been described above using the embodiments. However, the present invention is not limited to these embodiments, and the present invention is not limited to the scope of the present invention. Included in the invention.
That is, various changes and modifications that can be naturally made by those skilled in the art are also included in the present invention.

  The inductance element of the present invention can be used for power supply circuits such as electronic devices, arithmetic circuits, communication circuits, control circuits, and the like.

DESCRIPTION OF SYMBOLS 1, 1a Inductance element 2 Magnetic core 3 Insulation case 4 Conductor 5 Dielectric 6 Coated conducting wire 7 Coil 8a Mounting terminal 8b Mounting terminal 8c Mounting terminal 8d Mounting terminal 9 Ground terminal 10 Slack distance 15 Divided line 20 Noise filter 21 Ground 22 Capacitor 23 Normal mode choke coil 24 Capacitor 25 Capacitor 26 Power supply 27 Load

Claims (2)

An annular magnetic core having soft magnetic properties, an insulating case capable of covering the outer surface of the magnetic core with an electrically insulating material, a conductive sheet-like conductor, and an electrically insulating sheet An inductance element comprising a shaped dielectric, a ground terminal made of a conductive metal rod, and a coated conductor having an electrically insulating coating,
The magnetic core is housed in the insulating case to form an annular assembly, the conductor connected to one end of the ground terminal is disposed on the outer surface of the assembly, and the dielectric is further connected to the conductive body. A coil is formed by winding the coated conductive wire on a body arranged on a body, and formed at a connection terminal that can be electrically connected to the outside at the beginning and end of winding of the coil. An inductance characterized in that a slack distance between the upper surface and the outer surface of the coil on the conductor side perpendicular to the surface of the conductor is not less than the thickness of the dielectric and not more than 1.5 mm. element.   2. The inductance element according to claim 1, wherein the coated conductor is formed using an aluminum wire or a copper clad aluminum wire.

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