Coil electronic component

Abstract

To provide an electron component having a winding type coupled inductor structure whose layout freedom is enhanced in a conductive wire having various shapes.SOLUTION: A coil electronic component 1000 comprises: a first coil including at least one turn of a first conductive wire 210; a second coil including at least one turn of a second conductive wire 310; and a body 100 that is arranged from a first region R1 between a first core 113 of the first coil and a second core 123 of the second coil to a second region R2 between the first coil and the second coil, and includes an intermediate layer (third magnetic body 103) including a first magnetic material and a second magnetic material that surrounds a coil and the intermediate layer. Each cross section of the first and second conductive wires has a longitudinal shape, and satisfies the following formulas 1 and 2: [Formula 1] 0<w1≤t1<T1 / 2; and [Formula 2] 0<w1'≤t1'<T1 / 2, in which t1 is a thickness of the cross section of the first conductive wire, w1 is a width of the cross section of the first conductive wire, t1' is a thickness of the cross section of the second conductive wire, w1' is a width of the cross section of the second conductive wire, and T1 is a thickness of the main body.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to coil electronic components.

Background Art

[0002] Recently, as the functions of mobile devices have diversified and power consumption has increased, in order to increase the battery usage time in mobile devices, coil electronic components with low loss and excellent efficiency have been adopted around power semiconductors (PMIC: power management integrated circuit).

[0003] The coil electronic component can have a wound-type coupled inductor structure in which a primary coil and a secondary coil are laminated. In this case, the magnitude of the DC resistance (Rdc) and the inductance change depending on the cross-sectional shape of the conductor used as the primary coil and the secondary coil.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The present invention has been made in view of the above prior art, and an object of the present invention is to provide a coil electronic component having a wound-type coupled inductor structure with increased design freedom.

Means for Solving the Problems

[0006] A coil electronic component according to one aspect of the present invention made to achieve the above object includes a first coil including at least one turn of a first conductive wire, a second coil including at least one turn of a second conductive wire and facing the first coil, an intermediate layer disposed from a first region between a first core of the first coil and a second core of the second coil to a second region between the first coil and the second coil and including a first magnetic material, and a main body surrounding the first coil, the second coil, and the intermediate layer and including a second magnetic material. Cross-sections of the first conductive wire and the second conductive wire are each rectangular, and satisfy the following conditional expressions 1 and 2, respectively. [Conditional Expression 1] 0 < w1 ≦ t1 < T1 / 2 [Conditional Expression 2] 0 < w1’ ≦ t1’ < T1 / 2 Here, t1: thickness of the cross-section of the first conductive wire, w1: width of the cross-section of the first conductive wire, t1’: thickness of the cross-section of the second conductive wire, w1’: width of the cross-section of the second conductive wire, T1: thickness of the main body

[0007] Based on a cross-section cut in a direction parallel to the direction in which the first coil and the second coil face each other, the sum of the cross-sectional areas of the first coil and the second coil with respect to the cross-sectional area of the main body can be 0.048 or more and 0.200 or less. The number of turns of the first coil can be 7.81 or more and 27.17 or less, and the number of turns of the second coil can be 7.81 or more and 27.17 or less. w1 and t1, and w1’ and t1’ can each satisfy the following ranges. 0.0075 ≦ w1 / L1 ≦ 0.02735, 0.0548 ≦ t1 / T1 ≦ 0.2 0.0075 ≦ w1’ / L1 ≦ 0.02735, 0.0548 ≦ t1’ / T1 ≦ 0.2 Here, L1: length of the main body The number of turns of the first coil and the number of turns of the second coil are each 4.5, and the value obtained by dividing the width of the first core of the first coil by the length of the main body can be 0.3905 or more and 0.47 or less, and the value obtained by dividing the width of the second core of the second coil by the length of the main body can be 0.3905 or more and 0.47 or less. Based on the cross-section cut in a direction parallel to the direction in which the first coil and the second coil face each other, the ratio of the sum of the cross-sectional areas of the first coil and the second coil to the cross-sectional area of the main body can be 0.026.

[0008] A coil electronic component according to another aspect of the present invention made to achieve the above object includes a first coil including at least one turn of a first conductive wire, a second coil including at least one turn of a second conductive wire and separated from the first coil, an intermediate layer disposed from a first region between a first core of the first coil and a second core of the second coil to a second region between the first coil and the second coil and including a first magnetic material, and a main body surrounding the first coil, the second coil, and the intermediate layer and including a second magnetic material. The cross-sections of the first conductive wire and the second conductive wire are each circular and satisfy the following conditional expressions 3 and 4. [Conditional expression 3] 0 < D1 < L2 / 2 [Conditional expression 4] 0 < D2 < L2 / 2 Here, D1: diameter of the cross-section of the first conductive wire, D2: diameter of the cross-section of the second conductive wire, L2: length of the main body

[0009] Based on the cross-section cut in a direction parallel to the direction in which the first coil and the second coil face each other, the ratio of the sum of the cross-sectional areas of the first coil and the second coil to the cross-sectional area of the main body can be 0.012 or more and 0.151 or less. The number of turns of the first coil can be 2.5 or more and 23.2 or less, and the number of turns of the second coil can be 2.5 or more and 23.2 or less. D1 and D2 can each satisfy the following ranges. 0.0088 < D1 / L2 ≤ 0.100, 0.0088 < D2 / L2 ≤ 0.100 0.0176 < D1 / T2 ≤ 0.200, 0.0176 < D2 / T2 ≤ 0.200 Here, L2: length of the main body, T2: thickness of the main body The number of turns of the first coil and the number of turns of the second coil are each 4.5, and the value obtained by dividing the width of the first core of the first coil by the length of the main body may be 0.1 or more and 0.4785 or less, and the value obtained by dividing the width of the second core of the second coil by the length of the main body may be 0.1 or more and 0.4785 or less. Based on a cross-section cut in a direction parallel to the direction in which the first coil and the second coil face each other, the ratio of the sum of the cross-sectional areas of the first coil and the second coil to the cross-sectional area of the main body may be 0.001 or more and 0.354 or less.

[0010] A coil electronic component according to still another aspect of the present invention made to achieve the above object includes a first coil including at least one turn of a first conductive wire, a second coil including at least one turn of a second conductive wire and separated from the first coil, an intermediate layer disposed from a first region between a first core of the first coil and a second core of the second coil to a second region between the first coil and the second coil and including a first magnetic material, and a main body surrounding the first coil, the second coil, and the intermediate layer and including a second magnetic material, wherein cross-sections of the first conductive wire and the second conductive wire are each elliptical and satisfy the following conditional expressions 5 and 6. [Conditional expression 5] 0 < b1 < a1 < L3 / 2 [Conditional expression 6] 0 < b2 < a2 < L3 / 2 Here, a1: the length of the major axis of the cross-section of the first conductive wire, b1: the length of the minor axis of the cross-section of the first conductive wire, a2: the length of the major axis of the cross-section of the second conductive wire, b2: the length of the minor axis of the cross-section of the second conductive wire, L3: the length of the main body

[0011] Based on a cross-section cut in a direction parallel to the direction in which the first coil and the second coil face each other, the ratio of the sum of the cross-sectional areas of the first coil and the second coil to the cross-sectional area of the main body may be 0.0202. The number of turns of the first coil may be 1.8 or more and 11.9 or less, and the number of turns of the second coil may be 1.8 or more and 11.9 or less. a1 and b1, as well as a2 and b2, may each satisfy the following ranges. 0.0175 ≤ a1 / L3 ≤ 0.150, b1 / T3 = 0.030 0.0175 ≤ a2 / L3 ≤ 0.150, b2 / T3 = 0.030 Here, L3: length of the main body, T3: thickness of the main body The number of turns of the first coil and the number of turns of the second coil are each 4.5, and the value obtained by dividing the width of the first core of the first coil by the length of the main body is 0.1 or more and 0.43 or less, and the value obtained by dividing the width of the second core of the second coil by the length of the main body may be 0.1 or more and 0.43 or less. Based on the cross-section cut in the direction parallel to the direction in which the first coil and the second coil face each other, the ratio of the sum of the cross-sectional areas of the first coil and the second coil to the cross-sectional area of the main body may be 0.007 or more and 0.0412 or less. a1 and b1, as well as a2 and b2, may each satisfy the following ranges. 0.0175 ≤ a1 / L3 ≤ 0.100, b1 / T3 = 0.030 0.0175 ≤ a2 / L3 ≤ 0.100, b2 / T3 = 0.030 Here, L3: length of the main body, T3: thickness of the main body

[0012] A coil electronic component according to still another aspect of the present invention made to achieve the above object includes a first coil including at least one turn of a first conductive wire, a second coil including at least one turn of a second conductive wire and separated from the first coil, an intermediate layer disposed from a first region between a first core of the first coil and a second core of the second coil to a second region between the first coil and the second coil and including a first magnetic material, and a main body surrounding the first coil, the second coil, and the intermediate layer and including a second magnetic material. Cross-sections of the first conductive wire and the second conductive wire each include an opposing portion facing each other and a curved portion connecting the opposing portions, and satisfy the following conditional expressions 7 and 8. [Conditional expression 7] 0 < t2 < w2 < L4 / 2 [Conditional Expression 8] 0 < w2’ ≤ t2’ < L4 / 2 Here, t2: thickness of the cross-section of the first conductor, w2: width of the cross-section of the first conductor, t2’: thickness of the cross-section of the second conductor, w2’: width of the cross-section of the second conductor, L4: length of the main body

[0013] Based on the cross-section cut in a direction parallel to the direction in which the first coil and the second coil face each other, the ratio of the sum of the cross-sectional areas of the first coil and the second coil to the cross-sectional area of the main body can be 0.0208 or more and 0.0245 or less. The number of turns of the first coil can be 1.8 or more and 11.9 or less, and the number of turns of the second coil can be 1.8 or more and 11.9 or less. w2 and t2, and w2’ and t2’ can each satisfy the following ranges. 0.0175 ≤ w2 / L4 ≤ 0.150, t2 / T4 = 0.030 0.0175 ≤ w2’ / L4 ≤ 0.150, t2’ / T4 = 0.030 Here, L4: length of the main body, T4: thickness of the main body The number of turns of the first coil and the number of turns of the second coil are each 4.5, and the value obtained by dividing the width of the first core of the first coil by the length of the main body can be 0.1 or more and 0.43 or less, and the value obtained by dividing the width of the second core of the second coil by the length of the main body can be 0.1 or more and 0.43 or less. Based on the cross-section cut in a direction parallel to the direction in which the first coil and the second coil face each other, the ratio of the sum of the cross-sectional areas of the first coil and the second coil to the cross-sectional area of the main body can be 0.0072 or more and 0.0503 or less. w2 and t2, and w2’ and t2’ can each satisfy the following ranges. 0.0175 ≤ w2 / L4 ≤ 0.100, t2 / T4 = 0.030 0.0175 ≤ w2’ / L4 ≤ 0.100, t2’ / T4 = 0.030 Here, L4: length of the main body, T4: thickness of the main body

Advantages of the Invention

[0014] According to the present invention, by increasing the design freedom of the wound-type coupled inductor, coil electronic components having various characteristics can be provided.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0016] Hereinafter, specific examples of embodiments for carrying out the present invention will be described in detail with reference to the drawings.

[0017] In the drawings, parts that are unnecessary for explanation for clearly explaining the present invention are omitted, and the same reference numerals are given to the same or similar components throughout the specification. Also, in the drawings, some components are exaggerated, omitted, or shown schematically, and the sizes of the components do not entirely reflect the actual sizes.

[0018] The drawings are only for facilitating understanding of the embodiments disclosed in this specification, and the technical idea disclosed in this specification is not limited by the drawings, and it should be understood that all modifications, equivalents, or alternatives included in the idea and technical scope of the present invention are included.

[0019] Terms including ordinals such as first, second, etc. are used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

[0020] Also, when a part such as a layer, film, region, plate, etc. is "on" or "above" another part, this includes not only the case where it is directly above the other part, but also the case where there are other parts in between. Conversely, when a part is "directly above" another part, it means that there are no other parts in between. Also, being "on" or "above" a reference part means being located above or below the reference part, and does not necessarily mean being located "on" or "above" in the opposite direction of gravity.

[0021] Throughout the specification, terms such as "comprising" or "having" are intended to specify the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and should not be construed as precluding the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof. Thus, when a part "comprises" a certain component, this means that it can further include other components, rather than excluding other components, unless otherwise stated to the contrary.

[0022] Also, throughout the specification, the term "in a plane" means when the target part is viewed from above, and the term "in a cross-section" means when the cross-section obtained by vertically cutting the target part is viewed from the side.

[0023] Also, throughout the specification, the term "connected" does not mean only that two or more components are directly connected, but also that two or more components are indirectly connected through other components, physically connected, electrically connected, or are integrated although referred to by different names depending on their positions or functions.

[0024] FIG. 1 is a perspective view schematically showing a coil electronic component according to an embodiment, FIG. 2 is a plan view schematically showing the coil electronic component of FIG. 1, FIG. 3 is a bottom view schematically showing the coil electronic component of FIG. 1, and FIG. 4 is a schematic cross-sectional view taken along line IV-IV' of FIG. 1.

[0025] Referring to FIGS. 1, 2, 3, and 4, the coil electronic component 1000 according to the present embodiment includes a main body 100, a first coil 200, a second coil 300, a first external electrode 500, a second external electrode 600, a third external electrode 700, and a fourth external electrode 800.

[0026] The main body 100 is formed in a substantially rectangular hexahedron shape, but the present embodiment is not limited thereto. During sintering, due to shrinkage of magnetic powder or the like, the main body 100 does not have a perfect rectangular hexahedron shape but substantially has a rectangular hexahedron shape. For example, the main body 100 is substantially rectangular hexahedron-shaped, but the portions corresponding to corners and vertices have a rounded shape.

[0027] In the present embodiment, for convenience of explanation, two surfaces facing each other in the length direction (L-axis direction) are defined as a first surface S1 and a second surface S2, respectively, two surfaces facing each other in the width direction (W-axis direction) are defined as a third surface S3 and a fourth surface S4, respectively, and two surfaces facing each other in the thickness direction (T-axis direction) are defined as a fifth surface S5 and a sixth surface S6, respectively.

[0028] The length of the coil electronic component 1000 means the maximum value among the lengths of a plurality of line segments parallel to the length direction (L-axis direction) by connecting two outermost boundary lines facing the length direction (L-axis direction) of the coil electronic component 1000 shown in the above cross-sectional photograph, based on an optical microscope or an SEM (Scanning Electron Microscope) photograph of the cross section in the length direction (L-axis direction) - thickness direction (T-axis direction) at the center in the width direction (W-axis direction) of the coil electronic component 1000. Alternatively, the length of the coil electronic component 1000 means the minimum value among the lengths of a plurality of line segments parallel to the length direction (L-axis direction) by connecting two outermost boundary lines facing the length direction (L-axis direction) of the coil electronic component 1000 shown in the above cross-sectional photograph. Or, the length of the coil electronic component 1000 means the arithmetic mean value of the lengths of at least two line segments among a plurality of line segments parallel to the length direction (L-axis direction) by connecting two outermost boundary lines facing the length direction (L-axis direction) of the coil electronic component 1000 shown in the above cross-sectional photograph.

[0029] The thickness of the coil electronic component 1000 means the maximum value among the lengths of a plurality of line segments parallel to the thickness direction (T-axis direction) by connecting two outermost boundary lines facing the thickness direction (T-axis direction) of the coil electronic component 1000 shown in the above cross-sectional photograph, based on an optical microscope or an SEM (Scanning Electron Microscope) photograph of the cross section in the length direction (L-axis direction) - thickness direction (T-axis direction) at the center in the width direction (W-axis direction) of the coil electronic component 1000. Alternatively, the thickness of the coil electronic component 1000 means the minimum value among the lengths of a plurality of line segments parallel to the thickness direction (T-axis direction) by connecting two outermost boundary lines facing the thickness direction (T-axis direction) of the coil electronic component 1000 shown in the above cross-sectional photograph. Or, the thickness of the coil electronic component 1000 means the arithmetic mean value of the lengths of at least two line segments among a plurality of line segments parallel to the thickness direction (T-axis direction) by connecting two outermost boundary lines facing the thickness direction (T-axis direction) of the coil electronic component 1000 shown in the above cross-sectional photograph.

[0030] The width of the coil electronic component 1000 refers to the maximum value among the lengths of a plurality of line segments parallel to the width direction (W-axis direction) by connecting two outermost boundary lines facing each other in the width direction (W-axis direction) of the coil electronic component 1000 shown in the above cross-sectional photograph, based on an optical microscope or SEM (Scanning Electron Microscope) photograph of the cross section (cross section) in the central part of the coil electronic component 1000 in the thickness direction (T-axis direction) - length direction (L-axis direction). Alternatively, the width of the coil electronic component 1000 refers to the minimum value among the lengths of a plurality of line segments parallel to the width direction (W-axis direction) by connecting two outermost boundary lines facing each other in the width direction (W-axis direction) of the coil electronic component 1000 shown in the above cross-sectional photograph. Or, the width of the coil electronic component 1000 refers to the arithmetic mean value of the lengths of at least two line segments among a plurality of line segments parallel to the width direction (W-axis direction) by connecting two outermost boundary lines facing each other in the width direction (W-axis direction) of the coil electronic component 1000 shown in the above cross-sectional photograph.

[0031] On the other hand, each of the length, width, and thickness of the coil electronic component 1000 can also be measured by a micrometer measurement method. The micrometer measurement method sets the zero point with a Gage R&R (Repeatability and Reproducibility) micrometer, inserts the coil electronic component 1000 according to this embodiment between the tips of the micrometer, and rotates the measurement lever of the micrometer to measure. On the other hand, when measuring the length of the coil electronic component 1000 by the micrometer measurement method, the length of the coil electronic component 1000 can mean the value measured once, or can also mean the arithmetic mean of the values measured multiple times. This can also be applied in the same way to the measurement of the width and thickness of the coil electronic component 1000.

[0032] The body 100 forms the appearance of the coil electronic component 1000, and when current is applied to the first coil 200 through the first external electrode 500 and the second external electrode 600 and current is applied to the second coil 300 through the third external electrode 700 and the fourth external electrode 800, it is a space in which a magnetic path through which the magnetic flux induced in the first coil 200 and the magnetic flux induced in the second coil 300 pass is formed.

[0033] The body 100 surrounds and encapsulates the first coil 200 and the second coil 300 and contains a magnetic material. The body 100 contains magnetic particles, and an insulating material is interposed between the magnetic particles.

[0034] The magnetic material includes a first metal magnetic powder, a second metal magnetic powder having a larger particle size than the first metal magnetic powder, and a third metal magnetic powder having a larger particle size than the second metal magnetic powder. The average particle size (D 50 ) of the first metal magnetic powder is 0.1 μm or more and 0.2 μm or less, the average particle size (D 50 ) of the second metal magnetic powder is 1 μm or more and 2 μm or less, and the average particle size (D 50 ) of the third metal magnetic powder is 25 μm or more and 30 μm or less.

[0035] The magnetic particles are ferrite particles or metal magnetic particles that exhibit magnetic properties.

[0036] The ferrite particles are, for example, at least one or more of spinel ferrites such as Mg-Zn-based, Mn-Zn-based, Mn-Mg-based, Cu-Zn-based, Mg-Mn-Sr-based, Ni-Zn-based, hexagonal ferrites such as Ba-Zn-based, Ba-Mg-based, Ba-Ni-based, Ba-Co-based, Ba-Ni-Co-based, garnet ferrites such as Y-based, and Li-based ferrites.

[0037] The metal magnetic particles are composed of two or more types of powders with different compositions, and contain at least one selected from the group consisting of iron (Fe), silicon (Si), chromium (Cr), cobalt (Co), molybdenum (Mo), aluminum (Al), niobium (Nb), copper (Cu), and nickel (Ni). For example, the metal magnetic particles are pure iron or a soft magnetic alloy. When the metal magnetic particles are a soft magnetic alloy, the metal magnetic particles are at least one of an Fe-Si alloy, an Fe-Si-Al alloy, an Fe-Ni alloy, an Fe-Ni-Mo alloy, an Fe-Ni-Mo-Cu alloy, an Fe-Co alloy, an Fe-Ni-Co alloy, an Fe-Cr alloy, an Fe-Cr-Si alloy, an Fe-Si-Cu-Nb alloy, an Fe-Ni-Cr alloy, and an Fe-Cr-Al alloy. Here, the different compositions of the metal magnetic particles mean the case where the contents are different.

[0038] The metal magnetic particles may be amorphous or crystalline. For example, the metal magnetic particles are an Fe-Si-B-Cr based amorphous alloy, but the present embodiment is not limited thereto. The metal magnetic particles have an average particle size of about 0.1 μm to 30 μm, but are not limited thereto. In this specification, the average particle size means a particle size distribution expressed as D 90 or D 50 and the like. The particle size distribution is an index indicating what sizes (particle diameters) of particles are contained in what ratios in the particle group to be measured, and is well known to ordinary technicians. D 50 (The particle diameter corresponding to 50% of the volume cumulative of the particle size distribution) indicates the average particle size.

[0039] The metal magnetic particles may be two or more different types of metal magnetic particles. Here, the different types of metal magnetic particles mean that the metal magnetic particles are distinguishable from each other in at least one of the average particle size, composition, component ratio, crystallinity, and shape.

[0040] The insulating material includes, but is not limited to, epoxy, polyimide, liquid crystal polymer, etc., either alone or in combination.

[0041] The method of forming the main body 100 is not particularly limited. For example, after placing sheets made of magnetic material below the first coil 200, between the first coil 200 and the second coil 300, and above the second coil 300, these are crimped and cured to form the main body 100. As another example, after placing sheets made of magnetic material below and above the first coil 200 respectively, these are crimped and cured, and then the second coil 300 and a sheet made of magnetic material are sequentially placed thereon, and then these are crimped and cured to form the main body 100 as well.

[0042] The first coil 200 and the second coil 300 are arranged inside the main body 100 and exhibit the characteristics of coil electronic components. For example, when the coil electronic component 1000 of this embodiment is utilized as a power inductor, when a current is applied to the first coil 200 and the second coil 300, it stores energy in the form of a magnetic field and maintains the output voltage, thereby playing a role in stabilizing the power supply of the electronic device.

[0043] The first coil 200 and the second coil 300 are magnetically coupled to each other to form a coupled inductor structure.

[0044] The first coil 200 includes at least one turn of the first conductive wire 210, and the second coil 300 includes at least one turn of the second conductive wire 310. For example, the first coil 200 and the second coil 300 are in the form of a metal (such as copper (Cu) or silver (Ag)) wire with its surface coated with an insulating substance wound in a spiral shape. That is, the first coil 200 and the second coil 300 are wound coils. The first coil 200 and the second coil 300 are not limited to single wires and may be stranded wires or composed of two or more wires.

[0045] Although the first coil 200 and the second coil 300 are circular coils, they are not limited thereto. For example, the first coil 200 and the second coil 300 may be various known coils such as rectangular coils and race track-shaped coils.

[0046] Referring to FIG. 4, the cross-sections of the first conductor 210 of the first coil 200 and the second conductor 310 of the second coil 300 are each rectangular in shape.

[0047] In this case, the first conductor 210 of the first coil 200 has a first coil surface 211, a second coil surface 212, a third coil surface 213, and a fourth coil surface 214. The first coil surface 211 and the second coil surface 212 face each other along the thickness direction (T-axis direction). The third coil surface 213 and the fourth coil surface 214 connect the first coil surface 211 and the second coil surface 212 and face each other along the length direction (L-axis direction).

[0048] The second conductor 310 of the second coil 300 has a first coil surface 311, a second coil surface 312, a third coil surface 313, and a fourth coil surface 314. The first coil surface 311 and the second coil surface 312 face each other along the thickness direction (T-axis direction). The third coil surface 313 and the fourth coil surface 314 connect the first coil surface 311 and the second coil surface 312 and face each other along the length direction (L-axis direction).

[0049] The first coil 200 and the second coil 300 are each composed of a plurality of layers. The first coil 200 includes a lower coil 200A and an upper coil 200B. The upper coil 200B is connected to the lower coil 200A and is disposed above the lower coil 200A, that is, on the fifth surface S5 side of the main body 100, to form a layer. The second coil 300 includes a lower coil 300A and an upper coil 300B. The upper coil 300B is connected to the lower coil 300A and is disposed above the lower coil 300A, that is, on the fifth surface S5 side of the main body 100, to form a layer.

[0050] The first coil 200 and the second coil 300 have a plurality of turns.

[0051] For example, the first coil 200 has, in order from the outer surface side to the inner side of the main body 100, an outermost turn coil C1, at least one intermediate turn coil C2, and an innermost turn coil C3.

[0052] Similarly, the second coil 300 has, in order from the outer surface side to the inner side of the main body 100, an outermost turn coil C1', at least one intermediate turn coil C2', and an innermost turn coil C3'.

[0053] An insulating film IF is provided along the surfaces of the first conductor 210 of the first coil 200 and the second conductor 310 of the second coil 300. The insulating film IF is for protecting and insulating the first conductor 210 of the first coil 200 and the second conductor 310 of the second coil 300, and includes a known insulating material such as Parylene. The insulating material included in the insulating film IF can be any kind and there is no special limitation. For example, the insulating film IF is a polyurethane resin, a polyester resin, an epoxy resin, or a polyamide-imide resin. The insulating film IF is formed by a method such as vapor deposition, but is not limited thereto.

[0054] The first coil 200 includes a winding portion 220 and a lead-out portion 230.

[0055] The winding portion 220 is a portion where the first conductor 210 forms at least one turn.

[0056] The lead-out portion 230 extends from both ends of the winding portion 220 and is respectively exposed on the sixth surface S6 of the main body 100. The lead-out portion 230 includes a first lead-out portion 233 and a second lead-out portion 235. The first lead-out portion 233 extends from one end of the winding portion 220 and is exposed on the sixth surface S6 of the main body 100, and the second lead-out portion 235 extends from the other end of the winding portion 220 and is exposed on the sixth surface S6 of the main body 100.

[0057] On the one hand, the portions of the first lead-out portion 233 and the second lead-out portion 235 exposed on the sixth surface S6 of the main body 100 are spaced apart from each other in the length direction (L-axis direction), but it is not limited thereto.

[0058] The second coil 300 includes a winding portion 320 and a lead-out portion 330.

[0059] The winding portion 320 is the portion where the second conductor 310 forms at least one turn.

[0060] The lead-out portion 330 extends from both ends of the winding portion 320 and is respectively exposed on the sixth surface S6 of the main body 100. The lead-out portion 330 includes a first lead-out portion 333 and a second lead-out portion 335. The first lead-out portion 333 extends from one end of the winding portion 320 and is exposed on the sixth surface S6 of the main body 100, and the second lead-out portion 335 extends from the other end of the winding portion 320 and is exposed on the sixth surface S6 of the main body 100.

[0061] On the one hand, the portions of the first lead-out portion 333 and the second lead-out portion 335 exposed on the sixth surface S6 of the main body 100 are spaced apart from each other in the length direction (L-axis direction), but it is not limited thereto.

[0062] For example, the main body 100 includes a first magnetic body 101, a second magnetic body 102, and a third magnetic body 103.

[0063] The first magnetic body 101 forms a part of the first surface S1, a part of the second surface S2, a part of the third surface S3, and a part of the fourth surface S4 of the main body 100, and forms the sixth surface S6 of the main body 100. The first magnetic body 101 surrounds most of the first coil 200 except for the portion where the first coil 200 faces the second coil 300.

[0064] The second magnetic body 102 forms a part of the first surface S1, a part of the second surface S2, a part of the third surface S3, and a part of the fourth surface S4 of the main body 100, and forms the fifth surface S5 of the main body 100. The second magnetic body 102 surrounds most of the second coil 300 except for the portion where the second coil 300 faces the first coil 200.

[0065] The third magnetic body 103 is disposed between the first coil 200 and the second coil 300, and will be referred to as the "intermediate layer" hereinafter when necessary. For example, the third magnetic body 103 is in contact with the first coil 200 and the second coil 300.

[0066] The third magnetic body 103 is disposed so as to extend from the first region R1 between the first core 113 of the first coil 200 and the second core 123 of the second coil 300 to the second region R2 between the first coil 200 and the second coil 300. The third magnetic body 103 extends so as to be in contact with the outer surface of the main body 100 beyond the second region R2. For example, the third magnetic body 103 is in contact with the first surface S1 and the second surface S2 of the main body 100.

[0067] The first core 113 is a region where the first hollow space of the first coil 200 is at least partially filled by the first magnetic body 101, and the second core 123 is a region where the second hollow of the second coil 300 is at least partially filled by the second magnetic body 102. That is, the first magnetic body 101 that fills the first hollow of the first coil 200 forms the first core 113 around which the first coil 200 is wound, and the second magnetic body 102 that fills the second hollow of the second coil 300 forms the second core 123 around which the second coil 300 is wound.

[0068] The third magnetic body 103 extends from the first region R1 to a part of the first core 113, or extends from the first region R1 to a part of the second core 123. On the other hand, the third magnetic body 103 extends from the first region R1 to a part of the first core 113 and a part of the second core 123.

[0069] When the third magnetic body 103 extends from the first region R1 to a part of the first core 113, a part of the first core 113 is filled with the third magnetic body 103 and the remaining part of the first core 113 is filled with the first magnetic body 101. Also, when the third magnetic body 103 extends from the first region R1 to a part of the second core 123, a part of the second core 123 is filled with the third magnetic body 103 and the remaining part of the second core 123 is filled with the second magnetic body 102. In this case, the first magnetic body 101 and the third magnetic body 103 that fill the first hollow of the first coil 200 form the first core 113 around which the first coil 200 is wound, and the second magnetic body 102 and the third magnetic body 103 that fill the second hollow of the second coil 300 form the second core 123 around which the second coil 300 is wound.

[0070] Similar to the first magnetic body 101 and the second magnetic body 102, the third magnetic body 103 contains the above-described magnetic material, but the permeability of the third magnetic body 103 may be smaller or larger than the permeability of the first magnetic body 101 and the second magnetic body 102. Further, the permeability of the first magnetic body 101 and the second magnetic body 102 and the permeability of the third magnetic body 103 are appropriately set to adjust the coefficient of coupling (K) between the first coil 200 and the second coil 300.

[0071] For example, when the magnetic permeability of the first magnetic body 101 is the same as that of the second magnetic body 102 and the first magnetic particles are included, the volume fraction of the first magnetic particles included in the first magnetic body 101 and the second magnetic body 102 and the volume fraction of the second magnetic particles included in the third magnetic body 103 are made different from each other by a method of adjusting the magnetic permeability of the third magnetic body 103. Here, the volume fraction of the magnetic particles means the ratio of the volume of the first magnetic particles to the volume of the first magnetic body 101 and the second magnetic body 102 or the ratio of the volume of the second magnetic particles to the volume of the third magnetic body 103. The first magnetic particles and the second magnetic particles are realized with the same substance, for example, a metal alloy of the same composition, in order to adjust the relative magnetic permeability between the first magnetic body 101 and the second magnetic body 102 and the third magnetic body 103 by the volume fraction of the first magnetic particles and the second magnetic particles. On the other hand, by a method of adjusting the magnetic permeability of the first magnetic body 101 and the second magnetic body 102 and the third magnetic body 103, when confirmed by the cross-sectional area, the area fraction of the first magnetic particles included in the first magnetic body 101 and the second magnetic body 102 and the area fraction of the second magnetic particles included in the third magnetic body 103 can be made different from each other. Here, the area fraction of the magnetic particles means the ratio of the cross-sectional area of the first magnetic particles to the cross-sectional area of the first magnetic body 101 and the second magnetic body 102 or the ratio of the cross-sectional area of the second magnetic particles to the cross-sectional area of the third magnetic body 103.

[0072] When the magnetic permeability of the third magnetic body 103 is greater than the magnetic permeabilities of the first magnetic body 101 and the second magnetic body 102, it is the case where the volume fraction of the second magnetic particles contained in the third magnetic body 103 is greater than the volume fraction of the first magnetic particles contained in the first magnetic body 101 and the second magnetic body 102. When the magnetic permeability of the third magnetic body 103 is greater than the magnetic permeabilities of the first magnetic body 101 and the second magnetic body 102, the coupling coefficient between the first coil 200 and the second coil 300 relatively decreases. Here, the fact that the coupling coefficient relatively decreases means that the coupling coefficient becomes smaller compared to the case where the magnetic permeability of the third magnetic body 103 is the same as the magnetic permeabilities of the first magnetic body 101 and the second magnetic body 102. When the magnetic permeability of the third magnetic body 103 is relatively large, the amount of magnetic flux flowing through the third magnetic body 103 is relatively large, and the mutual inductance due to the magnetic flux shared by the first coil 200 and the second coil 300 becomes smaller. Here, the magnetic flux flowing through the third magnetic body 103 is understood to flow in the length direction (L-axis direction) of the third magnetic body 103 in FIG. 4.

[0073] Ultimately, the mutual inductance between the first coil 200 and the second coil 300 becomes smaller, and the leakage inductance formed only in the first coil 200 or the second coil 300 becomes larger. Therefore, the coupling coefficient between the first coil 200 and the second coil 300 becomes smaller.

[0074] When the magnetic permeability of the third magnetic body 103 on the reverse side is smaller than that of the first magnetic body 101 and the second magnetic body 102, it is the case where the volume fraction of the second magnetic particles contained in the third magnetic body 103 is smaller than the volume fraction of the first magnetic particles contained in the first magnetic body 101 and the second magnetic body 102. When the magnetic permeability of the third magnetic body 103 is smaller than that of the first magnetic body 101 and the second magnetic body 102, the coupling coefficient between the first coil 200 and the second coil 300 increases relatively. Here, the fact that the coupling coefficient increases relatively means that the coupling coefficient becomes larger compared to the case where the magnetic permeability of the third magnetic body 103 is the same as that of the first magnetic body 101 and the second magnetic body 102. When the magnetic permeability of the third magnetic body 103 is relatively small, the amount of magnetic flux flowing through the third magnetic body 103 is relatively small, and the mutual inductance due to the magnetic flux shared by the first coil 200 and the second coil 300 becomes larger. Here, the magnetic flux flowing through the third magnetic body 103 is understood as flowing in the length direction (L-axis direction) of the third magnetic body 103 in FIG. 4.

[0075] Ultimately, the mutual inductance between the first coil 200 and the second coil 300 becomes larger, and the leakage inductance formed only in the first coil 200 or the second coil 300 becomes smaller. Therefore, the coupling coefficient between the first coil 200 and the second coil 300 becomes larger.

[0076] The above description relates to the case where the magnetic permeabilities of the first magnetic body 101 and the second magnetic body 102 are the same and contain the first magnetic particles, but it is similarly applicable to the case where the magnetic permeabilities of the first magnetic body 101 and the second magnetic body 102 are different and the first magnetic body 101 and the second magnetic body 102 contain different magnetic particles.

[0077] The first external electrode 500 and the second external electrode 600 are provided outside the main body 100 and are electrically connected to the first coil 200.

[0078] The first external electrode 500 is disposed on the sixth surface S6 of the main body 100, and the first lead-out portion 233 of the first coil 200 is exposed on the sixth surface S6 of the main body 100 and is connected to the first external electrode 500.

[0079] The second external electrode 600 is disposed on the sixth surface S6 of the main body 100, and the second lead portion 235 of the first coil 200 is exposed on the sixth surface S6 of the main body 100 and connected to the second external electrode 600.

[0080] The first external electrode 500 and the second external electrode 600 are formed of a conductive material such as copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), chromium (Cr), titanium (Ti), or an alloy thereof, but are not limited thereto.

[0081] The first external electrode 500 and the second external electrode 600 include a plurality of metal layers formed by plating a conductive metal.

[0082] Referring to the left circle in FIG. 1, the first external electrode 500 includes a first metal layer 501, a second metal layer 502, and a third metal layer 503.

[0083] The first metal layer 501 is a plating layer that contacts the first lead portion 233 of the first coil 200 and the outer surface of the main body 100 and contains copper (Cu). The second metal layer 502 is a plating layer that covers the first metal layer 501 and contains nickel (Ni). The third metal layer 503 is a plating layer that covers the second metal layer 502 and contains tin (Sn). However, this embodiment is not limited to such a three-layer structure, and a two-layer structure in which only one plating layer is added on the first metal layer 501 is also possible.

[0084] Referring to the right circle in FIG. 1, the second external electrode 600 includes a first metal layer 601, a second metal layer 602, and a third metal layer 603.

[0085] The first metal layer 601 is a plating layer that contacts the second lead-out portion 235 of the first coil 200 and the outer surface of the main body 100, and contains copper (Cu). The second metal layer 602 is a plating layer that covers the first metal layer 601, and contains nickel (Ni). The third metal layer 603 is a plating layer that covers the second metal layer 602, and contains tin (Sn). However, this embodiment is not limited to such a three-layer structure, and a two-layer structure in which only one plating layer is added on the first metal layer 601 is also possible.

[0086] Thus, the first external electrode 500 and the second external electrode 600 contain nickel (Ni), copper (Cu), palladium (Pd), gold (Au), or an alloy thereof, and include a plurality of plating layers. For example, the first external electrode 500 and the second external electrode 600 are formed by a combination of a nickel (Ni) layer, a copper (Cu) layer, a nickel / copper (Ni / Cu) layer (i.e., a metal layer in which a copper (Cu) layer is laminated on a nickel (Ni) layer), a palladium / nickel (Pd / Ni) layer (i.e., a metal layer in which a nickel (Ni) layer is laminated on a palladium (Pd) layer), a palladium / nickel / copper (Pd / Ni / Cu) layer (i.e., a metal layer in which a nickel (Ni) layer and a copper (Cu) layer are sequentially laminated in this order on a palladium (Pd) layer), and a copper / nickel / copper (Cu / Ni / Cu) layer (i.e., a metal layer in which a nickel (Ni) layer and a copper (Cu) layer are sequentially laminated in this order on a copper (Cu) layer).

[0087] In some cases, the outermost layer of the external electrode can also be made of tin (Sn). Since the tin plating layer has a relatively low melting point, it is possible to improve the ease of mounting the first external electrode 500 and the second external electrode 600 on the substrate.

[0088] Generally, the tin plating layer is bonded to the electrode pads on the substrate through solder containing a tin (Sn)-copper (Cu)-silver (Ag) alloy paste. That is, the tin plating layer is melted and bonded to the solder during the reflow process.

[0089] As another example, the first external electrode 500 and the second external electrode 600 can include a plurality of electrode layers. For example, the first external electrode 500 and the second external electrode 600 include a first electrode layer, a second electrode layer covering the first electrode layer, and a third electrode layer covering the second electrode layer. The first electrode layer contains copper (Cu) and is a conductive resin layer. The conductive resin layer contains a conductive metal for ensuring electrical conductivity and a resin for shock absorption. The resin is not particularly limited as long as it has bonding properties and shock absorption properties and is mixed with conductive metal powder to form a paste, and includes, for example, a phenol resin, an acrylic resin, a silicon resin, an epoxy resin, or a polyimide resin. The conductive metal includes, for example, copper (Cu), tin (Sn), nickel (Ni), silver (Ag), palladium (Pd), gold (Au), platinum (Pt), tungsten (W), titanium (Ti), alloys thereof, or combinations thereof.

[0090] The third external electrode 700 and the fourth external electrode 800 are provided outside the main body 100 and are electrically connected to the second coil 300.

[0091] The third external electrode 700 is disposed on the sixth surface S6 of the main body 100, and the first lead portion 333 of the second coil 300 is exposed on the sixth surface S6 of the main body 100 and is connected to the third external electrode 700.

[0092] The fourth external electrode 800 is disposed on the sixth surface S6 of the main body 100, and the second lead portion 335 of the second coil 300 is exposed on the sixth surface S6 of the main body 100 and is connected to the fourth external electrode 800.

[0093] Since the structures and components of the third external electrode 700 and the fourth external electrode 800 are the same as those of the first external electrode 500 and the second external electrode 600 described above, duplicate descriptions thereof are omitted.

[0094] On one hand, in the main body 100 of the coil electronic component 1000 according to the present embodiment, an insulating layer 900 is provided in a region excluding the region where the first external electrode 500, the second external electrode 600, the third external electrode 700, and the fourth external electrode 800 are arranged. In contrast, in the region between the portion where the first lead-out portion 233 of the first coil 200 is exposed on the sixth surface S6 of the main body 100, the portion where the second lead-out portion 235 of the first coil 200 is exposed, the portion where the first lead-out portion 333 of the second coil 300 is exposed, and the portion where the second lead-out portion 335 of the second coil 300 is exposed, an insulating layer may exist. In this case, the first external electrode 500, the second external electrode 600, the third external electrode 700, and the fourth external electrode 800 cover a part of the insulating layer.

[0095] In this way, the insulating layer 900 is arranged on at least a part of the first surface S1, the second surface S2, the third surface S3, the fourth surface S4, the fifth surface S5, and the sixth surface S6 of the main body 100 to prevent an electrical short between other electronic components and the external electrodes (500, 600, 700, 800).

[0096] The insulating layer 900 is used as a resist when forming the external electrodes (500, 600, 700, 800) by electrolytic plating, but is not limited thereto.

[0097] On the other hand, the shapes of the external electrodes (500, 600, 700, 800) according to the present embodiment are not limited to those described above and can be various shapes.

[0098] As an example, the first external electrode 500 is connected to the first lead-out portion 233 of the first coil 200 on the sixth surface S6 of the main body 100 and extended to the second surface S2 of the main body 100. Further, the second external electrode 600 is connected to the second lead-out portion 235 of the first coil 200 on the sixth surface S6 of the main body 100 and extended to the first surface S1 of the main body 100. The third external electrode 700 is connected to the first lead-out portion 333 of the second coil 300 on the sixth surface S6 of the main body 100 and extended to the first surface S1 of the main body 100. Further, the fourth external electrode 800 is connected to the second lead-out portion 335 of the second coil 300 on the sixth surface S6 of the main body 100 and extended to the second surface S2 of the main body 100.

[0099] As another example, the first external electrode 500 is connected to the first lead-out portion 233 of the first coil 200 on the sixth surface S6 of the main body 100 and extends to the second surface S2 and the fifth surface S5 of the main body 100. Also, the second external electrode 600 is connected to the second lead-out portion 235 of the first coil 200 on the sixth surface S6 of the main body 100 and extends to the first surface S1 and the fifth surface S5 of the main body 100. The third external electrode 700 is connected to the first lead-out portion 333 of the second coil 300 on the sixth surface S6 of the main body 100 and extends to the first surface S1 and the fifth surface S5 of the main body 100. Also, the fourth external electrode 800 is connected to the second lead-out portion 335 of the second coil 300 on the sixth surface S6 of the main body 100 and extends to the second surface S2 and the fifth surface S5 of the main body 100.

[0100] When the length of the coil electronic component is constant, the larger the width of the core, the larger the area of the magnetic path, and thus the inductance increases. Also, the smaller the size of the margin portion in the length direction (L-axis direction) of the magnetic body, the larger the inductance. That is, when the size of the margin portion is reduced, the coil is arranged farther from the center of the coil electronic component, so the width of the core increases and the inductance increases. On the other hand, the larger the number of turns of the conductor of the coil, the larger the inductance.

[0101] In this embodiment, the number of turns of the coil is adjusted by changing the thickness and width of the cross-section of the conductor while fixing the width of the core and the area of the cross-section of the conductor, or the width of the core is adjusted by changing the thickness and width of the cross-section of the conductor while fixing the number of turns of the coil and the area of the cross-section of the conductor. This will be described more specifically below.

[0102] The cross-section of the first conductor 210 is rectangular and satisfies the following conditional expression 1.

[0103] [Conditional Expression 1] 0 < w1 ≤ t1 < T1 / 2 Here, t1: the thickness of the cross-section of the first conductor, w1: the width of the cross-section of the first conductor, T1: the thickness of the main body

[0104] Also, w1 and t1 satisfy the following ranges.

[0105] 0.0075 ≤ w1 / L1 ≤ 0.02735, 0.0548 ≤ t1 / T1 ≤ 0.2 Here, L1: length of the main body

[0106] For example, when the length of the main body is 2.000 mm and the thickness is 1.000 mm, w1 and t1 satisfy the following ranges.

[0107] 0.015 mm ≤ w1 ≤ 0.0547 mm, 0.0548 mm ≤ t1 ≤ 0.200 mm

[0108] Also, the cross-section of the second conductor 310 is rectangular and satisfies the following conditional expression 2.

[0109] [Conditional expression 2] 0 < w1’ ≤ t1’ < T1 / 2 Here, t1’: thickness of the cross-section of the second conductor, w1’: width of the cross-section of the second conductor, T1: thickness of the main body

[0110] Also, w1’ and t1’ satisfy the following ranges.

[0111] 0.0075 ≤ w1’ / L1 ≤ 0.02735, 0.0548 ≤ t1’ / T1 ≤ 0.2 Here, L1: length of the main body

[0112] For example, when the length of the main body is 2.000 mm and the thickness is 1.000 mm, w1’ and t1’ satisfy the following ranges.

[0113] 0.015 mm ≤ w1’ ≤ 0.0547 mm, 0.0548 mm ≤ t1’ ≤ 0.200 mm

[0114] The thickness and width of the cross-section of the first conductor 210 and the thickness and width of the cross-section of the second conductor 310 are measured based on a photograph taken by an optical microscope or a scanning electron microscope (SEM) of a cross-section (hereinafter referred to as an "L-T cross-section") cut in the length direction (L-axis direction) - thickness direction (T-axis direction) perpendicular to the width direction (W-axis direction) at the center in the width direction (W-axis direction) of the coil electronic component 1000.

[0115] For example, the thickness of each cross-section of the first conductor 210 (or the second conductor 310) means the maximum value among the lengths of a plurality of line segments connecting two sides facing each other in the first direction of the cross-section in the above-mentioned L-T cross-section photograph. Here, the first direction is parallel to the thickness direction (T-axis direction) or forms an angle of less than 45 degrees with the thickness direction (T-axis direction). Also, the width of the cross-section of the first conductor 210 (or the second conductor 310) can mean the maximum value among the lengths of a plurality of line segments connecting two sides facing each other in the second direction of the cross-section in the above-mentioned L-T cross-section photograph. Here, the second direction is parallel to the length direction (L-axis direction) or forms an angle of less than 45 degrees with the length direction (L-axis direction). Further, the thickness of the cross-section of the first conductor 210 (or the second conductor 310) may be the arithmetic mean value of the thicknesses of the cross-sections of the first conductor 210 (or the second conductor 310) at three points separated from the first conductor 210 (or the second conductor 310) of the outermost turn by the same interval in the above-mentioned L-T cross-section photograph. On the other hand, the width of the cross-section of the first conductor 210 (or the second conductor 310) may be the arithmetic mean value of the widths of the cross-sections of the first conductor 210 (or the second conductor 310) at three points separated from the first conductor 210 (or the second conductor 310) of the outermost turn by the same interval in the above-mentioned L-T cross-section photograph.

[0116] Also, the ratio of the sum of the cross-sectional areas of the first coil 200 and the second coil 300 to the cross-sectional area of the main body 100 is 0.048 or more and 0.2 or less.

[0117] The cross-sectional area of the first coil 200, the cross-sectional area of the second coil 300, and the cross-sectional area of the main body 100 are measured based on a photograph taken by an optical microscope or a scanning electron microscope (SEM) of a cross-section (hereinafter referred to as the "L-T cross-section") obtained by cutting in the length direction (L-axis direction) - thickness direction (T-axis direction) perpendicular to the width direction (W-axis direction) at the center in the width direction (W-axis direction) of the coil electronic component 1000.

[0118] For example, the cross-sectional area of the first coil 200, the cross-sectional area of the second coil 300, and the cross-sectional area of the main body 100 are obtained by measuring the above-described L-T cross-section photograph by a scanning electron microscope (SEM) - energy dispersive X-ray spectroscopy (hereinafter referred to as "SEM-EDX").

[0119] As another example, the cross-sectional area of the first coil 200 can be obtained by accurately measuring the area of each cross-section of the first conductor 210 shown in the above-described L-T cross-section photograph using known image analysis software and then adding up all these values. The cross-sectional area of the second coil 300 can be obtained in the same manner.

[0120] Also, the cross-sectional area of the main body 100 shown in the above-described L-T photograph can be accurately measured using known image analysis software.

[0121] Also, the number of turns of the first coil 200 is 7.81 or more and 27.17 or less, and the number of turns of the second coil 300 is 7.81 or more and 27.17 or less.

[0122] On the other hand, the number of turns of the first coil 200 and the second coil 300 may each be 4.5. In this case, the width d1 of the first core 113 of the first coil 200 is 0.781 mm or more and 0.940 mm or less, and the width d2 of the second core 123 of the second coil 300 is 0.781 mm or more and 0.940 mm or less. Also, the value (d1 / L1) obtained by dividing the width d1 of the first core 113 of the first coil 200 by the length L1 of the main body 100 is 0.3905 or more and 0.47 or less, and the value (d2 / L1) obtained by dividing the width d2 of the second core 123 of the second coil 300 by the length L1 of the main body 100 is 0.3905 or more and 0.47 or less. In this case, the ratio of the sum of the cross-sectional areas of the first coil 200 and the second coil 300 to the cross-sectional area of the main body 100 is 0.026.

[0123] The width d1 of the first core 113 of the first coil 200 and the width d2 of the second core 123 of the second coil 300 are measured based on a photograph taken by an optical microscope or a scanning electron microscope (SEM) of a cross-section (hereinafter referred to as an "L-T cross-section") obtained by cutting perpendicularly to the width direction (W-axis direction) in the central portion in the width direction (W-axis direction) of the coil electronic component 1000 in the length direction (L-axis direction)-thickness direction (T-axis direction).

[0124] For example, the width of the first core 113 is the arithmetic mean value of the widths of the first core 113 at five points separated at the same interval along the thickness direction (T-axis direction) in the above-described L-T cross-section photograph. The width of the second core 123 is obtained in the same manner.

[0125] FIG. 5 is a cross-sectional view schematically showing a first example of a coil electronic component according to another embodiment.

[0126] Referring to FIG. 5, the coil electronic component 2000 includes a main body 1100, a first coil 1200, a second coil 1300, a first external electrode 500, a second external electrode 600, a third external electrode 700, and a fourth external electrode 800.

[0127] The first coil 1200 includes at least one turn of a first conductive wire 1210, and the second coil 1300 includes at least one turn of a second conductive wire 1310.

[0128] The cross-section of the first conductive wire 1210 is circular and satisfies the following conditional expression 3.

[0129] [Conditional expression 3] 0 < D1 < L2 / 2 Here, D1: diameter of the cross-section of the first conductive wire, L2: length of the main body

[0130] Also, the cross-section of the second conductive wire 1310 is circular and satisfies the following conditional expression 4.

[0131] [Conditional expression 4] 0 < D2 < L2 / 2 Here, D2: diameter of the cross-section of the second conductive wire, L2: length of the main body

[0132] The diameter D1 of the cross-section of the first conductive wire 1210 and the diameter D2 of the cross-section of the second conductive wire 1310 are measured based on a photograph taken by an optical microscope or a scanning electron microscope (SEM) of a cross-section (hereinafter referred to as the "L-T cross-section") obtained by cutting the coil electronic component 1000 in the length direction (L-axis direction) - thickness direction (T-axis direction) perpendicular to the width direction (W-axis direction) at the center in the width direction (W-axis direction).

[0133] For example, the diameter of the cross-section of the first conductive wire 1210 (or the second conductive wire 1310) is the arithmetic mean value of the diameters of the cross-sections of the first conductive wire 1210 (or the second conductive wire 1310) at the lowermost, central, and uppermost positions in the thickness direction (T-axis direction) at the outermost turn (C1 or C1') in the above-mentioned L-T cross-section photograph.

[0134] Also, the ratio of the sum of the cross-sectional areas of the first coil 1200 and the second coil 1300 to the cross-sectional area of the main body 1100 is 0.012 or more and 0.151 or less.

[0135] The cross-sectional areas of the first coil 1200, the second coil 1300, and the main body 1100 are measured based on the optical microscope or scanning electron microscope (SEM) photographs of the cross-section (hereinafter referred to as the "L-T cross-section") cut perpendicularly to the width direction (W-axis direction) in the central part of the width direction (W-axis direction) of the coil electronic component 2000 in the length direction (L-axis direction) - thickness direction (T-axis direction).

[0136] For example, the cross-sectional areas of the first coil 1200, the second coil 1300, and the main body 1100 are obtained by measuring the above-mentioned L-T cross-section photographs with SEM-EDX.

[0137] As another example, the cross-sectional area of the first coil 1200 can be obtained by accurately measuring the areas of the cross-sections of each of the first conductors 1210 shown in the above-mentioned L-T cross-section photograph using known image analysis software and then adding up all these values. The cross-sectional area of the second coil 1300 can also be obtained in the same way.

[0138] Also, the cross-sectional area of the main body 1100 shown in the above-mentioned L-T photograph can be accurately measured using known image analysis software.

[0139] Also, the number of turns of the first coil 1200 is 2.5 or more and 23.2 or less, and the number of turns of the second coil 1300 is 2.5 or more and 23.2 or less.

[0140] Also, D1 and D2 each satisfy the following ranges.

[0141] 0.0088 ≦ D1 / L2 ≦ 0.100, 0.0088 ≦ D2 / L2 ≦ 0.100 0.0176 ≦ D1 / T2 ≦ 0.200, 0.0176 < D2 / T2 ≦ 0.200 Here, L2: length of the main body, T2: thickness of the main body

[0142] For example, when the length of the main body is 2.000 mm and the thickness is 1.000 mm, D1 and D2 each satisfy the following ranges.

[0143] 0.0176 mm ≤ D1 ≤ 0.2000 mm, 0.0176 mm ≤ D2 ≤ 0.2000 mm

[0144] On the other hand, the number of turns of the first coil 1200 and the second coil 1300 may each be 4.5. In this case, the width d3 of the first core 1113 of the first coil 1200 is 0.2 mm or more and 0.957 mm or less, and the width d4 of the second core 1123 of the second coil 1300 is 0.2 mm or more and 0.957 mm or less. Also, the value (d3 / L2) obtained by dividing the width d3 of the first core 1113 of the first coil 1200 by the length L2 of the main body 1100 is 0.1 or more and 0.4785 or less, and the value (d4 / L2) obtained by dividing the width d4 of the second core 1123 of the second coil 1300 by the length L2 of the main body 1100 is 0.1 or more and 0.4785 or less. In this case, the ratio of the sum of the cross-sectional areas of the first coil 1200 and the second coil 1300 to the cross-sectional area of the main body 1100 is 0.001 or more and 0.354 or less.

[0145] The width d3 of the first core 1113 of the first coil 1200 and the width d4 of the second core 1123 of the second coil 1300 are measured based on a photograph taken by an optical microscope or a scanning electron microscope (SEM) of a cross-section (hereinafter referred to as an "L-T cross-section") cut perpendicular to the width direction (W-axis direction) in the length direction (L-axis direction) - thickness direction (T-axis direction) at the center in the width direction (W-axis direction) of the coil electronic component 2000.

[0146] For example, the width of the first core 1113 is the arithmetic mean value of the widths of the first core 1113 at five points separated at the same interval along the thickness direction (T-axis direction) in the above-described L-T cross-section photograph. The width of the second core 1123 is obtained in the same manner.

[0147] Since the remaining components other than the above are the same as or correspond to the components of the coil electronic component shown in FIG. 1, repeated explanations are omitted.

[0148] FIG. 6 is a cross-sectional view schematically showing a second example of a coil electronic component according to another embodiment.

[0149] Referring to FIG. 6, the coil electronic component 3000 includes a main body 2100, a first coil 2200, a second coil 2300, a first external electrode 500, a second external electrode 600, a third external electrode 700, and a fourth external electrode 800.

[0150] The first coil 2200 includes at least one turn of a first conductive wire 2210, and the second coil 2300 includes at least one turn of a second conductive wire 2310.

[0151] The cross-section of the first conductive wire 2210 is elliptical and satisfies the following conditional expression 5.

[0152] [Conditional expression 5] 0 < b1 < a1 < L3 / 2 Here, a1: the length of the major axis of the cross-section of the first conductive wire, b1: the length of the minor axis of the cross-section of the first conductive wire, L3: the length of the main body

[0153] Also, the cross-section of the second conductive wire 2310 is elliptical and satisfies the following conditional expression 6.

[0154] [Conditional expression 6] 0 < b2 < a2 < L3 / 2 Here, a2: the length of the major axis of the cross-section of the second conductive wire, b2: the length of the minor axis of the cross-section of the second conductive wire, L3: the length of the main body

[0155] The length a1 and the length b1 of the minor axis of the cross-section of the first conductive wire 2210 and the length a2 and the length b2 of the minor axis of the cross-section of the second conductive wire 2310 are measured based on a photograph taken by an optical microscope or a scanning electron microscope (SEM) of a cross-section (hereinafter referred to as an "L-T cross-section") cut in the length direction (L-axis direction) - thickness direction (T-axis direction) perpendicular to the width direction (W-axis direction) at the center in the width direction (W-axis direction) of the coil electronic component 3000.

[0156] For example, the length of the minor axis of each cross-section of the first conductor 2210 (or the second conductor 2310) is the arithmetic mean of the lengths of the minor axes of the cross-sections of the first conductor 2210 (or the second conductor 2310) at the lowermost, central, and uppermost positions in the thickness direction (T-axis direction) of the outermost turn (C1 or C1') in the above-described L-T cross-section photograph. Also, the length of the major axis of each cross-section of the first conductor 2210 (or the second conductor 2310) is the arithmetic mean of the lengths of the major axes of the cross-sections of the first conductor 2210 (or the second conductor 2310) at the lowermost, central, and uppermost positions in the thickness direction (T-axis direction) of the outermost turn (C1 or C1') in the above-described L-T cross-section photograph.

[0157] Also, the ratio of the sum of the cross-sectional areas of the first coil 2200 and the second coil 2300 to the cross-sectional area of the main body 2100 is 0.0202.

[0158] The cross-sectional area of the first coil 2200, the cross-sectional area of the second coil 2300, and the cross-sectional area of the main body 2100 are measured based on a photograph taken by an optical microscope or a scanning electron microscope (SEM) of a cross-section (hereinafter referred to as an "L-T cross-section") cut perpendicularly to the width direction (W-axis direction) in the length direction (L-axis direction) - thickness direction (T-axis direction) at the center in the width direction (W-axis direction) of the coil electronic component 3000.

[0159] For example, the cross-sectional area of the first coil 2200, the cross-sectional area of the second coil 2300, and the cross-sectional area of the main body 2100 are obtained by measuring the above-described L-T cross-section photograph with SEM-EDX.

[0160] As another example, the cross-sectional area of the first coil 2200 can be obtained by accurately measuring the area of each cross-section of the first conductor 2210 shown in the above-described L-T cross-section photograph using known image analysis software and then summing up these values. The cross-sectional area of the second coil 2300 can also be obtained in the same manner.

[0161] Also, the cross-sectional area of the main body 2100 shown in the above-described L-T photograph can be accurately measured using known image analysis software.

[0162] Also, in this case, the number of turns of the first coil 2200 is 1.8 or more and 11.9 or less, and the number of turns of the second coil 2300 is 1.8 or more and 11.9 or less.

[0163] Also, in this case, a1 and b1 as well as a2 and b2 each satisfy the following ranges.

[0164] 0.00175 ≤ a1 / L3 ≤ 0.150, b1 / T3 = 0.030 0.00175 ≤ a2 / L3 ≤ 0.150, b2 / T3 = 0.030 Here, L3: length of the main body, T3: thickness of the main body

[0165] For example, when the length of the main body is 2.000 mm and the thickness is 1.000 mm, a1 and b1 as well as a2 and b2 each satisfy the following ranges.

[0166] 0.035 mm ≤ a1 ≤ 0.300 mm, b1 = 0.030 mm 0.035 mm ≤ a2 ≤ 0.300 mm, b2 = 0.030 mm

[0167] On the other hand, the number of turns of the first coil 2200 and the second coil 2300 may each be 4.5. In this case, the width d5 of the first core 2113 of the first coil 2200 is 0.2 mm or more and 0.86 mm or less, and the width d6 of the second core 2123 of the second coil 2300 is 0.2 mm or more and 0.86 mm or less. Also, the value (d5 / L3) obtained by dividing the width d5 of the first core 2113 of the first coil 2200 by the length L3 of the main body 2100 is 0.1 or more and 0.43 or less, and the value (d6 / L3) obtained by dividing the width d6 of the second core 2123 of the second coil 2300 by the length L3 of the main body 2100 is 0.1 or more and 0.43 or less. Also, in this case, the ratio of the sum of the cross-sectional areas of the first coil 2200 and the second coil 2300 to the cross-sectional area of the main body 2100 is 0.007 or more and 0.0412 or less. In this case, a1 and b1 as well as a2 and b2 each satisfy the following ranges respectively.

[0168] 0.0175 ≤ a1 / L3 ≤ 0.100, b1 / T3 = 0.030 0.0175 ≤ a2 / L3 ≤ 0.100, b2 / T3 = 0.030 Here, L3: length of the main body, T3: thickness of the main body

[0169] For example, when the length of the main body is 2.000 mm and the thickness is 1.000 mm, a1 and b1 as well as a2 and b2 respectively satisfy the following ranges.

[0170] 0.035 mm ≤ a1 ≤ 0.200 mm, b1 = 0.030 mm 0.035 mm ≤ a2 ≤ 0.200 mm, b2 = 0.030 mm

[0171] The width d5 of the first core 2113 of the first coil 2200 and the width d6 of the second core 2123 of the second coil 2300 are measured based on a photograph taken by an optical microscope or a scanning electron microscope (SEM) of a cross-section (hereinafter referred to as the "L-T cross-section") obtained by cutting the coil electronic component 2000 in the length direction (L-axis direction) - thickness direction (T-axis direction) perpendicular to the width direction (W-axis direction) at the center in the width direction (W-axis direction).

[0172] For example, the width of the first core 2113 is the arithmetic mean value of the widths of the first core 2113 at five points separated at the same interval along the thickness direction (T-axis direction) in the above-mentioned L-T cross-section photograph. The width of the second core 2123 is obtained in the same manner.

[0173] Since the remaining components other than the above are the same as the components of the coil electronic component shown in FIG. 1, duplicate descriptions thereof are omitted.

[0174] FIG. 7 is a cross-sectional view schematically showing a third example of a coil electronic component according to another embodiment.

[0175] Referring to FIG. 7, the coil electronic component 4000 includes a main body 3100, a first coil 3200, a second coil 3300, a first external electrode 500, a second external electrode 600, a third external electrode 700, and a fourth external electrode 800.

[0176] The first coil 3200 includes at least one turn of a first conductive wire 3210, and the second coil 3300 includes at least one turn of a second conductive wire 3310.

[0177] The first coil 3200 and the second coil 3300 have a plurality of turns and are edgewise coils.

[0178] For example, the first coil 3200 has an outermost turn coil C1 and an innermost turn coil C2 in sequence from the sixth surface S6 side to the fifth surface S5 side of the main body 3100. On the other hand, although not shown, at least one intermediate turn coil can be arranged between the outermost turn coil C1 and the innermost turn coil C2.

[0179] Similarly, the second coil 3300 has an outermost turn coil C1' and an innermost turn coil C2' in sequence from the fifth surface S5 side to the sixth surface S6 side of the main body 3100. On the other hand, although not shown, at least one intermediate turn coil can be arranged between the outermost turn coil C1' and the innermost turn coil C2'.

[0180] The cross-section of the first conductive wire 3210 includes a first opposing portion 3211 and a second opposing portion 3213 that face each other, and a first curved portion 3215 and a second curved portion 3217 that connect the first opposing portion 3211 and the second opposing portion 3213, and satisfies the following conditional expression 7.

[0181] [Conditional Expression 7] 0 < t2 < w2 < L4 / 2 Here, t2: the thickness of the cross-section of the first conductive wire, w2: the width of the cross-section of the first conductive wire, L4: the length of the main body

[0182] The first opposing portion 3211 and the second opposing portion 3213 face each other in the thickness direction (T-axis direction). The first opposing portion 3211 and the second opposing portion 3213 have a linear shape.

[0183] The first curved portion 3215 and the second curved portion 3217 face each other in the width direction (T-axis direction) and connect the first opposing portion 3211 and the second opposing portion 3213. That is, the left (reference to FIG. 7) end of the first opposing portion 3211 and the left (reference to FIG. 7) end of the second opposing portion 3213 are connected by the first curved portion 3215, and the right (reference to FIG. 7) end of the first opposing portion 3211 and the right (reference to FIG. 7) end of the second opposing portion 3213 are connected by the second curved portion 3217. The first curved portion 3215 and the second curved portion 3217 are curved shapes and each have a shape convex in the width direction (T-axis direction). For example, the radius of curvature of the first curved portion 3215 and the second curved portion 3317 is 1 / 2 of the thickness of the first conductor 3210.

[0184] Also, the cross-section of the second conductor 3310 includes the first opposing portion 3311 and the second opposing portion 3313 facing each other and the first curved portion 3315 and the second curved portion 3317 connecting the first opposing portion 3311 and the second opposing portion 3313, and satisfies the following conditional expression 8.

[0185] [Conditional Expression 8] 0 < t2’ < w2’ < L4 / 2 Here, t2’: the thickness of the cross-section of the second conductor, w2’: the width of the cross-section of the second conductor, L4: the length of the main body

[0186] The first opposing portion 3311 and the second opposing portion 3313 face each other in the thickness direction (T-axis direction). The first opposing portion 3311 and the second opposing portion 3313 have a linear shape.

[0187] The first curved portion 3315 and the second curved portion 3317 face each other in the width direction (T-axis direction) and connect the first opposing portion 3311 and the second opposing portion 3313. That is, the left end (based on FIG. 7) of the first opposing portion 3311 and the left end (based on FIG. 7) of the second opposing portion 3313 are connected by the first curved portion 3315, and the right end (based on FIG. 7) of the first opposing portion 3311 and the right end (based on FIG. 7) of the second opposing portion 3313 are connected by the second curved portion 3317. The first curved portion 3315 and the second curved portion 3317 are curved and each has a shape convex in the width direction (T-axis direction). For example, the radii of curvature of the first curved portion 3315 and the second curved portion 3317 are 1 / 2 of the thickness of the second conductor 3310.

[0188] The thickness and width of the cross-section of the first conductor 3210 and the thickness and width of the cross-section of the second conductor 3310 are measured based on a photograph taken by an optical microscope or a scanning electron microscope (SEM) of a cross-section (hereinafter referred to as an "L-T cross-section") obtained by cutting perpendicularly to the width direction (W-axis direction) in the length direction (L-axis direction) - thickness direction (T-axis direction) at the center in the width direction (W-axis direction) of the coil electronic component 4000.

[0189] For example, the thickness of each cross-section of the first conductor 3210 (or the second conductor 3310) means the maximum value of the distance between the first opposing portion and the second opposing portion of the cross-section in the above-mentioned L-T cross-section photograph. Also, the width of the cross-section of the first conductor 3210 (or the second conductor 3310) means the maximum value of the distance between the first curved portion and the second curved portion of the cross-section in the above-mentioned L-T cross-section photograph. Further, the thickness of the cross-section of the first conductor 3210 (or the second conductor 3310) is the arithmetic mean value of the thicknesses of the cross-sections of the first conductor 3210 (or the second conductor 3310) at three points separated from the first conductor 3210 (or the second conductor 3310) of the outermost turn by the same interval in the above-mentioned L-T cross-section photograph. On the other hand, the width of the cross-section of the first conductor 3210 (or the second conductor 3310) is the arithmetic mean value of the widths of the cross-sections of the first conductor 3210 (or the second conductor 3310) at three points separated from the first conductor 3210 (or the second conductor 3310) of the outermost turn by the same interval in the above-mentioned L-T cross-section photograph.

[0190] As another example, the thickness of the cross-section of the first conductor 3210 (or the second conductor 3310) means the arithmetic mean value of the maximum value and the minimum value of the distance between the first opposing portion and the second opposing portion of the cross-section in the above-described L-T cross-sectional photograph, and the width of the cross-section of the first conductor 3210 (or the second conductor 3310) means the arithmetic mean value of the maximum value and the minimum value of the distance between the first curved portion and the second curved portion of the cross-section in the above-described L-T cross-sectional photograph.

[0191] As still another example, the thickness of the cross-section of the first conductor 3210 (or the second conductor 3310) is the arithmetic mean value of the thicknesses of the cross-section at three points separated from the first opposing portion (or the second opposing portion) at the same interval in the above-described L-T cross-sectional photograph. The above three points do not include both ends of the first opposing portion (or the second opposing portion). The width of the cross-section of the first conductor 3210 (or the second conductor 3310) is the distance between a first straight line passing through the maximum point of the first curved portion and a second straight line passing through the maximum point of the second curved portion and parallel to the first straight line in the above-described L-T cross-sectional photograph.

[0192] Also, the ratio of the sum of the cross-sectional areas of the first coil 3200 and the second coil 3300 to the cross-sectional area of the main body 3100 is 0.0208 or more and 0.0245 or less. Here, the number of turns of the first coil 3200 is 1.8 or more and 11.9 or less, and the number of turns of the second coil 3300 is 1.8 or more and 11.9 or less. Also, w2 and t2 and w2' and t2' each satisfy the following ranges.

[0193] 0.0175 ≤ w2 / L4 ≤ 0.150, t2 / T4 = 0.030 0.0175 ≤ w2' / L4 ≤ 0.150, t2' / T4 = 0.030 Here, L4: length of the main body, T4: thickness of the main body

[0194] For example, when the length of the main body is 2.000 mm and the thickness is 1.000 mm, w2 and t2 and w2' and t2' each satisfy the following ranges.

[0195] 0.035 mm ≤ w2 ≤ 0.300 mm, t2 = 0.030 mm 0.035 mm ≤ w2’ ≤ 0.300 mm, t2’ = 0.030 mm

[0196] On the other hand, the number of turns of the first coil 3200 and the second coil 3300 may each be 4.5. In this case, the width d7 of the first core 3113 of the first coil 3200 is 0.2 mm or more and 0.86 mm or less, and the width d8 of the second core 3123 of the second coil 3300 is 0.2 mm or more and 0.86 mm or less. Also, the value (d7 / L4) obtained by dividing the width d7 of the first core 3113 of the first coil 3200 by the length L4 of the main body 3100 is 0.1 or more and 0.43 or less, and the value (d8 / L4) obtained by dividing the width d8 of the second core 3123 of the second coil 3300 by the length L4 of the main body 3100 is 0.1 or more and 0.43 or less. In this case, the ratio of the sum of the cross-sectional areas of the first coil 3200 and the second coil 3300 to the cross-sectional area of the main body 3100 is 0.0072 or more and 0.0503 or less. Also, w2 and t2 and w2’ and t2’ each satisfy the following ranges.

[0197] 0.0175 ≤ w2 / L4 ≤ 0.100, t2 / T4 = 0.030 0.0175 ≤ w2’ / L4 ≤ 0.100, t2’ / T4 = 0.030 Here, L4: length of the main body, T4: thickness of the main body

[0198] For example, when the length of the main body is 2.000 mm and the thickness is 1.000 mm, w2 and t2 and w2’ and t2’ each satisfy the following ranges.

[0199] 0.035 mm ≤ w2 ≤ 0.200 mm, t2 = 0.030 mm 0.035 mm ≤ w2’ ≤ 0.200 mm, t2’ = 0.030 mm

[0200] The cross-sectional area of the first coil 3200, the cross-sectional area of the second coil 3300, and the cross-sectional area of the main body 3100 are measured based on a photograph taken by an optical microscope or a scanning electron microscope (SEM) of a cross-section (hereinafter referred to as an "L-T cross-section") obtained by cutting in the length direction (L-axis direction) - thickness direction (T-axis direction) perpendicular to the width direction (W-axis direction) at the center in the width direction (W-axis direction) of the coil electronic component 1000.

[0201] For example, the cross-sectional area of the first coil 3200, the cross-sectional area of the second coil 3300, and the cross-sectional area of the main body 3100 are obtained by measuring the above-mentioned L-T cross-section photograph with SEM-EDX.

[0202] As another example, the cross-sectional area of the first coil 3200 is obtained by accurately measuring the area of each cross-section of the first conductor 3210 shown in the above-mentioned L-T cross-section photograph using known image analysis software and then adding up all these values. The cross-sectional area of the second coil 3300 is obtained in the same manner.

[0203] Also, the cross-sectional area of the main body 3100 shown in the above-mentioned L-T photograph can be accurately measured using known image analysis software.

[0204] Since the remaining components other than the above are the same as the components of the coil electronic component shown in FIG. 1, duplicate descriptions thereof are omitted.

[0205] Hereinafter, specific embodiments of the present invention will be presented. However, the embodiments described below are merely for specifically exemplifying or explaining the present invention, and the scope of the invention should not be limited thereby.

Embodiment

[0206] ≪Manufacturing Example 1: Manufacturing of Coil Electronic Component≫

[0207] Coil electronic components according to Examples 1 to 18 and Comparative Examples 1 to 8 were manufactured by forming a two-layer lower coil and a two-layer upper coil with a conductor having a rectangular cross-sectional shape.

[0208] Specific numerical values regarding the cross-section of the conducting wire, the coil, and the body of the manufactured coil electronic component are as shown in Table 1. On the other hand, the length, thickness, and width of the body are 2.000 mm, 1.000 mm, and 1.200 mm respectively, the thickness of the intermediate layer is 0.200 mm, the margin in the length direction (L-axis direction) is 0.100 mm, and the margin in the width direction (W-axis direction) is 0.500 mm.

[0209]

Table 1

[0210] The turn width of the coil means the width of the cross-section of the coil disposed between the core and the first surface (or the second surface) of the body.

[0211] The cross-sectional area of the body means the cross-sectional area occupied by the magnetic material excluding the coil.

[0212] ≪Manufacturing Example 2: Manufacturing of Coil Electronic Component≫

[0213] Coil electronic components according to Examples 19 to 34 and Comparative Examples 9 to 16 were manufactured by forming a two-layer lower coil and a two-layer upper coil with a conducting wire having a circular cross-sectional shape.

[0214] Specific numerical values regarding the cross-section of the conducting wire, the coil, and the body of the manufactured coil electronic component are as shown in Table 2. On the other hand, the length, thickness, and width of the body are 2.000 mm, 1.000 mm, and 1.200 mm respectively, the thickness of the intermediate layer is 0.200 mm, the margin in the length direction (L-axis direction) is 0.100 mm, and the margin in the width direction (W-axis direction) is 0.500 mm.

[0215]

Table 2

[0216] The turn width of the coil means the width of the cross-section of the coil disposed between the core and the first surface (or the second surface) of the body.

[0217] The cross-sectional area of the main body means the cross-sectional area occupied by the magnetic material excluding the coil.

[0218] <<Manufacturing Example 3: Manufacturing of Coil Electronic Components>>

[0219] Lower coils of two layers and upper coils of two layers were formed with a conductor having an elliptical or circular cross-sectional shape, and coil electronic components according to Examples 35 to 47 and Comparative Examples 17 to 26 were manufactured.

[0220] Specific numerical values regarding the cross-section of the conductor, the coil, and the main body of the manufactured coil electronic component are as shown in Table 3. On the other hand, the length, thickness, and width of the main body are 2.000 mm, 1.000 mm, and 1.200 mm, respectively, the thickness of the intermediate layer is 0.200 mm, the margin in the length direction (L-axis direction) is 0.100 mm, and the margin in the width direction (W-axis direction) is 0.500 mm.

[0221]

Table 3

[0222] The turn width of the coil means the width of the cross-section of the coil disposed between the core and the first surface (or the second surface) of the main body.

[0223] The cross-sectional area of the main body means the cross-sectional area occupied by the magnetic material excluding the coil.

[0224] <<Manufacturing Example 4: Manufacturing of Coil Electronic Components>>

[0225] Lower coils of two layers and upper coils of two layers were formed with a conductor having opposing portions and curved portions, and coil electronic components according to Examples 48 to 61 and Comparative Examples 27 to 35 were manufactured.

[0226] Specific numerical values regarding the cross-section of the conducting wire, the coil, and the body of the manufactured coil electronic component are as shown in Table 4. On the other hand, the length, thickness, and width of the body are 2.000 mm, 1.000 mm, and 1.200 mm respectively, the thickness of the intermediate layer is 0.200 mm, the margin in the length direction (L-axis direction) is 0.100 mm, and the margin in the width direction (W-axis direction) is 0.500 mm.

[0227]

Table 4

[0228] The turn width of the coil means the width of the cross-section of the coil disposed between the core and the first surface (or the second surface) of the body.

[0229] The cross-sectional area of the body means the cross-sectional area occupied by the magnetic body excluding the coil.

[0230] ≪Experimental Example≫

[0231] <Experimental Example 1>

[0232] The ratio of the coil cross-sectional area to the body cross-sectional area of the coil electronic components manufactured in Examples 1 to 18 and Comparative Examples 1 to 8 was measured, it was confirmed whether the coil was exposed in the thickness direction of the body, and it was confirmed whether the condition that the thickness of the cross-section of the conducting wire was the same as or greater than the width was satisfied, and the results are shown in Table 5.

[0233]

Table 5

[0234] Referring to Table 5, in the coil electronic components manufactured in Examples 1 to 18, no defect occurred where the coil was exposed in the thickness direction, and the thickness of the cross-section of the conducting wire was the same as or greater than the width, satisfying the condition regarding the cross-sectional shape of the conducting wire. In the coil electronic components manufactured in Comparative Examples 1, 2, and Comparative Examples 5, 6, although the coil was not exposed in the thickness direction, the width of the cross-section of the conducting wire was greater than the thickness, not satisfying the condition regarding the cross-sectional shape of the conducting wire.

[0235] On the other hand, in the coil electronic components manufactured in Comparative Examples 3, 4, and Comparative Examples 7, 8, the coil protruded from the outer surface in the thickness direction of the main body, resulting in defects.

[0236] <Experimental Example 2>

[0237] The ratio of the coil cross-sectional area to the main body cross-sectional area of the coil electronic components manufactured in Examples 19 to 34 and Comparative Examples 9 to 16 was measured. When a direct current was applied, it was confirmed whether the temperature change amount satisfied the rated current (temperature rise allowable current, I temp ), and it was confirmed whether the coil was exposed in the thickness direction of the main body. The results are shown in Table 6.

[0238]

Table 6

[0239] Referring to Table 6, in the coil electronic components manufactured in Examples 19 to 34, the coil was not exposed in the thickness direction, and the temperature rise did not exceed 40°C and satisfied the rated current. In the coil electronic components manufactured in Comparative Examples 9, 10, and Comparative Examples 13, 14, the coil was not exposed in the thickness direction, but the temperature rise exceeded 40°C and did not satisfy the rated current.

[0240] On the other hand, in the coil electronic components manufactured in Comparative Examples 11, 12, and Comparative Examples 15, 16, the temperature rise did not exceed 40°C, but the coil protruded from the outer surface in the thickness direction of the main body, resulting in defects.

[0241] <Experimental Example 3>

[0242] The ratio of the coil cross-sectional area to the main body cross-sectional area, the core width, and the number of turns of the coil of the coil electronic components manufactured in Examples 35 to 47 and Comparative Examples 17 to 26 were measured. It was confirmed whether the condition that the maximum length in the length direction (L-axis direction) of the cross-section of the conductor was larger than the maximum length in the thickness direction (T-axis direction) was satisfied. The results are shown in Table 7.

[0243]

Table 7

[0244] Referring to Table 7, the width of the core of the coil electronic components manufactured in Examples 35 to 47 was greater than 0 mm, the maximum length in the length direction (L-axis direction) of the cross-section of the conducting wire was greater than the maximum length in the thickness direction (T-axis direction), satisfying the conditions regarding the cross-sectional shape of the conducting wire, and the number of turns of the coil was greater than 1.

[0245] On the contrary, the maximum length in the length direction (L-axis direction) of the cross-section of the conducting wire of the coil electronic components manufactured in Comparative Examples 17, 18, and Comparative Examples 23, 24 was the same as or smaller than the maximum length in the thickness direction (T-axis direction), not satisfying the conditions regarding the cross-sectional shape of the conducting wire. The number of turns of the coil of the coil electronic components manufactured in Comparative Examples 20, 21, 22 was 1 or less. The width of the core of the coil electronic components manufactured in Comparative Examples 25, 26 was 0 mm or less.

[0246] <Experimental Example 4>

[0247] The ratio of the coil cross-sectional area to the body cross-sectional area, the core width, and the number of turns of the coil of the coil electronic components manufactured in Examples 48 to 61 and Comparative Examples 27 to 35 were measured to confirm whether the condition that the width of the cross-section of the conducting wire is greater than the thickness is satisfied, and the results are shown in Table 8.

[0248]

Table 8

[0249] Referring to Table 8, the width of the core of the coil electronic components manufactured in Examples 48 to 61 was greater than 0 mm, the width of the cross-section of the conducting wire was greater than the thickness, satisfying the conditions regarding the cross-sectional shape of the conducting wire, and the number of turns of the coil was greater than 1.

[0250] The widths of the coil electronic components manufactured in the reverse side, Comparative Examples 27 and 28, and Comparative Examples 32 and 33 were the same as or smaller than the thickness and did not satisfy the conditions regarding the cross-sectional shape of the conductive wire. The number of turns of the coils of the coil electronic components manufactured in Comparative Examples 29, 30, and 31 was 1 or less. The widths of the cores of the coil electronic components manufactured in Comparative Examples 34 and 35 were 0 mm or less.

[0251] As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the technical idea of the present invention.

Explanation of Reference Numerals

[0252] 1000, 2000, 3000, 4000 Coil Electronic Components 100, 1100, 2100, 3100 Body 101 to 103 First to Third Magnetic Bodies 113, 1113, 2113, 3113 First Core 123, 1123, 2123, 3123 Second Core 200, 1200, 2200, 3200 First Coil 200A, 300A Lower Coil 200B, 300B Upper Coil 210, 1210, 2210, 3210 First Conductive Wire 211, 311 First Coil Surface 212, 312 Second Coil Surface 213, 313 Third Coil Surface 214, 314 Fourth Coil Surface 220, 320 Winding Portion 230, 330 Lead-Out Portion 233, 333 First Lead-Out Portion 235, 335 Second Lead-Out Portion 300, 1300, 2300, 3300 Second Coil 310, 1310, 2310, 3310 Second Conductive Wire 500, 600, 700, 800 First to Fourth External Electrodes 501, 601 First Metal Layer 502, 602 Second metal layer 503, 603 Third metal layer 900 Insulating layer 3211, 3311 First opposing part 3213, 3313 Second opposing part 3215, 3315 First curved part 3217, 3317 Second curved part C1, C1' Outermost turn coil C2, C2' Intermediate turn coil C3, C3' Innermost turn coil IF Insulating film R1, R2 First and second regions S1 - S6 First to sixth surfaces

Claims

1. a first coil including at least one turn of a first conductive wire; a second coil including at least one turn of a second conductor opposite the first coil; an intermediate layer including a first magnetic material and disposed from a first region between a first core of the first coil and a second core of the second coil to a second region between the first coil and the second coil; a body including a second magnetic material surrounding the first coil, the second coil, and the intermediate layer; A coil electronic component, characterized in that the first conducting wire and the second conducting wire each have a rectangular cross section and satisfy the following conditional expressions 1 and 2, respectively. [Conditional formula 1] 0<w1≦t1<T1 / 2 [Conditional formula 2] 0<w1'≦t1'<T1 / 2 Where: t1: cross-sectional thickness of the first conductor w1: cross-sectional width of the first conductor t1': cross-sectional thickness of the second conductor w1': cross-sectional width of the second conductor T1: Body thickness

2. Based on a cross section cut in a direction parallel to the direction in which the first coil and the second coil face each other, 2. The coil electronic component according to claim 1, wherein a sum of a cross-sectional area of ​​the first coil and a cross-sectional area of ​​the second coil with respect to a cross-sectional area of ​​the main body is 0.048 or more and 0.200 or less.

3. the number of turns of the first coil is equal to or greater than 7.81 and equal to or less than 27.17; The coil electronic component according to claim 2 , wherein the number of turns of the second coil is equal to or greater than 7.81 and equal to or less than 27.

17.

4. 2. The coil electronic component according to claim 1, wherein w1 and t1, and w1' and t1', respectively, satisfy the following ranges. 0.0075≦w1 / L1≦0.02735, 0.0548≦t1 / T1≦0.2 0.0075≦w1′ / L1≦0.02735, 0.0548≦t1′ / T1≦0.2 Where: L1: Length of the body

5. the number of turns of the first coil and the number of turns of the second coil are each 4.5; a value obtained by dividing a width of a first core of the first coil by a length of the main body is equal to or greater than 0.3905 and is equal to or less than 0.47; 2. The coil electronic component according to claim 1, wherein a value obtained by dividing a width of the second core of the second coil by a length of the main body is equal to or greater than 0.3905 and equal to or less than 0.

47.

6. Based on a cross section cut in a direction parallel to the direction in which the first coil and the second coil face each other, 6. The coil electronic component according to claim 5, wherein a ratio of a sum of a cross-sectional area of ​​the first coil and a cross-sectional area of ​​the second coil to a cross-sectional area of ​​the main body is 0.

026.

7. a first coil including at least one turn of a first conductive wire; a second coil including at least one turn of a second conductive wire spaced apart from the first coil; an intermediate layer including a first magnetic material and disposed from a first region between a first core of the first coil and a second core of the second coil to a second region between the first coil and the second coil; a body including a second magnetic material surrounding the first coil, the second coil, and the intermediate layer; A coil electronic component, characterized in that the first conducting wire and the second conducting wire each have a circular cross section, and the following conditional expressions 3 and 4 are respectively satisfied. [Conditional formula 3] 0<D1<L2 / 2 [Conditional formula 4] 0<D2<L2 / 2 Where: D1: diameter of the cross section of the first conductor D2: diameter of the cross section of the second conductor L2: Length of the body

8. Based on a cross section cut in a direction parallel to the direction in which the first coil and the second coil face each other, The coil electronic component according to claim 7 , wherein a ratio of a sum of a cross-sectional area of ​​the first coil and a cross-sectional area of ​​the second coil to a cross-sectional area of ​​the main body is equal to or greater than 0.012 and equal to or less than 0.

151.

9. The number of turns of the first coil is equal to or greater than 2.5 and equal to or less than 23.2, The coil electronic component according to claim 8 , wherein the number of turns of the second coil is equal to or greater than 2.5 and equal to or less than 23.

2.

10. 8. The coil electronic component according to claim 7, wherein D1 and D2 respectively satisfy the following ranges. 0.0088<D1 / L2≦0.100, 0.0088<D2 / L2≦0.100 0.0176<D1 / T2≦0.200, 0.0176<D2 / T2≦0.200 Where: L2: Length of the body T2: Body thickness

11. the number of turns of the first coil and the number of turns of the second coil are each 4.5; A value obtained by dividing a width of a first core of the first coil by a length of the main body is equal to or greater than 0.1 and is equal to or less than 0.4785. The coil electronic component according to claim 7 , wherein a value obtained by dividing a width of the second core of the second coil by a length of the main body is equal to or greater than 0.1 and equal to or less than 0.4785.

12. Based on a cross section cut in a direction parallel to the direction in which the first coil and the second coil face each other, The coil electronic component according to claim 11, wherein a ratio of a sum of a cross-sectional area of ​​the first coil and a cross-sectional area of ​​the second coil to a cross-sectional area of ​​the main body is equal to or greater than 0.001 and equal to or less than 0.

354.

13. a first coil including at least one turn of a first conductive wire; a second coil including at least one turn of a second conductive wire spaced apart from the first coil; an intermediate layer including a first magnetic material and disposed from a first region between a first core of the first coil and a second core of the second coil to a second region between the first coil and the second coil; a body including a second magnetic material surrounding the first coil, the second coil, and the intermediate layer; A coil electronic component, characterized in that the cross sections of the first conducting wire and the second conducting wire are each elliptical, and the following conditional expressions 5 and 6 are respectively satisfied. [Conditional formula 5] 0<b1<a1<L3 / 2 [Conditional formula 6] 0<b2<a2<L3 / 2 Where: a1: Length of the major axis of the cross section of the first conductor b1: The length of the minor axis of the cross section of the first conductor a2: Length of the major axis of the cross section of the second conductor b2: Length of the minor axis of the cross section of the second conductor L3: Length of the body

14. Based on a cross section cut in a direction parallel to the direction in which the first coil and the second coil face each other, The coil electronic component according to claim 13, wherein a ratio of a sum of a cross-sectional area of ​​the first coil and a cross-sectional area of ​​the second coil to a cross-sectional area of ​​the main body is 0.0202.

15. the number of turns of the first coil is equal to or greater than 1.8 and equal to or less than 11.9; The coil electronic component according to claim 14, wherein the number of turns of the second coil is equal to or greater than 1.8 and equal to or less than 11.

9.

16. The coil electronic component according to claim 15, wherein a1 and b1, and a2 and b2, respectively, satisfy the following ranges. 0.0175≦a1 / L3≦0.150, b1 / T3=0.030 0.0175≦a2 / L3≦0.150, b2 / T3=0.030 Where: L3: Length of the body T3: Body thickness

17. the number of turns of the first coil and the number of turns of the second coil are each 4.5; The value obtained by dividing the width of the first core of the first coil by the length of the main body is equal to or greater than 0.1 and equal to or less than 0.

43. The coil electronic component according to claim 13, wherein a value obtained by dividing a width of the second core of the second coil by a length of the main body is equal to or greater than 0.1 and equal to or less than 0.

43.

18. Based on a cross section cut in a direction parallel to the direction in which the first coil and the second coil face each other, 18. The coil electronic component according to claim 17, wherein a ratio of a sum of a cross-sectional area of ​​the first coil and a cross-sectional area of ​​the second coil to a cross-sectional area of ​​the main body is 0.007 or more and 0.0412 or less.

19. The coil electronic component according to claim 18, wherein a1 and b1, and a2 and b2, respectively, satisfy the following ranges. 0.0175≦a1 / L3≦0.100, b1 / T3=0.030 0.0175≦a2 / L3≦0.100, b2 / T3=0.030 Where: L3: Length of the body T3: Body thickness

20. a first coil including at least one turn of a first conductive wire; a second coil including at least one turn of a second conductive wire spaced apart from the first coil; an intermediate layer including a first magnetic material and disposed from a first region between a first core of the first coil and a second core of the second coil to a second region between the first coil and the second coil; a body including a second magnetic material surrounding the first coil, the second coil, and the intermediate layer; A coil electronic component, characterized in that cross sections of the first conducting wire and the second conducting wire each include opposing portions facing each other and a curved portion connecting the opposing portions, and the following conditional expressions 7 and 8 are satisfied. [Conditional formula 7] 0<t2<w2<L4 / 2 [Conditional formula 8] 0<w2'≦t2'<L4 / 2 Where: t2: Cross-sectional thickness of the first conductor w2: Cross-sectional width of the first conductor t2': cross-sectional thickness of the second conductor w2': cross-sectional width of the second conductor L4: Length of the body

21. Based on a cross section cut in a direction parallel to the direction in which the first coil and the second coil face each other, The coil electronic component according to claim 20, wherein a ratio of a sum of a cross-sectional area of ​​the first coil and a cross-sectional area of ​​the second coil to a cross-sectional area of ​​the main body is equal to or greater than 0.0208 and equal to or less than 0.0245.

22. the number of turns of the first coil is equal to or greater than 1.8 and equal to or less than 11.9; The coil electronic component according to claim 21, wherein the number of turns of the second coil is 1.8 to 11.

9.

23. The coil electronic component according to claim 22, characterized in that w2 and t2, and w2' and t2', respectively, satisfy the following ranges. 0.0175≦w2 / L4≦0.150, t2 / T4=0.030 0.0175≦w2' / L4≦0.150, t2' / T4=0.030 Where: L4: Length of the body T4: Body thickness

24. the number of turns of the first coil and the number of turns of the second coil are each 4.5; The value obtained by dividing the width of the first core of the first coil by the length of the main body is equal to or greater than 0.1 and equal to or less than 0.

43. The coil electronic component according to claim 20, wherein a value obtained by dividing a width of the second core of the second coil by a length of the main body is 0.1 or more and 0.43 or less.

25. Based on a cross section cut in a direction parallel to the direction in which the first coil and the second coil face each other, The coil electronic component according to claim 24, wherein a ratio of a sum of a cross-sectional area of ​​the first coil and a cross-sectional area of ​​the second coil to a cross-sectional area of ​​the main body is equal to or greater than 0.0072 and equal to or less than 0.0503.

26. The coil electronic component according to claim 25, wherein w2 and t2, and w2' and t2', respectively, satisfy the following ranges. 0.0175≦w2 / L4≦0.100, t2 / T4=0.030 0.0175≦w2' / L4≦0.100, t2' / T4=0.030 Where: L4: Length of the body T4: Body thickness

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