Inductor components

Abstract

This invention provides an inductor component. There is a concern that the lead-out electrodes may excessively interrupt magnetic flux when current flows through the inductor wiring. The inductor component (10) includes a blank (20). The blank (20) has a mounting surface (21) and a top surface (22) that are parallel to each other, a first end surface (23) and a second end surface (24) that are parallel to each other, and a first side surface and a second side surface that are parallel to each other. Inductor wiring (30) is disposed inside the blank (20). A first lead-out electrode (40) is connected to a first end in the extending direction of the inductor wiring (30). A second lead-out electrode (50) is connected to a second end in the extending direction of the inductor wiring (30). The lower surfaces of the first lead-out electrode (40) and the second lead-out electrode (50) are exposed from the mounting surface (21) of the blank (20). The first lead-out electrode (40) is a quadrangular prism extending in the height direction (Td). The first lead electrode (40) is exposed from the first end face (23) and the first side face.

Description

Technical Field

[0001] This disclosure relates to inductor components. Background Technology

[0002] The inductor component described in Patent Document 1 includes a blank. Inductor wiring is arranged inside the blank. A first lead electrode is connected to a first end of the inductor wiring. The first lead electrode extends in an L-shape across a mounting surface of the blank and a first end face connected to the mounting surface. The surface of the first lead electrode is exposed from both the mounting surface and the first end face of the blank. A second lead electrode is connected to a second end of the inductor wiring. The second lead electrode, like the first lead electrode, extends in an L-shape across a mounting surface and a second end face connected to the mounting surface. The surface of the second lead electrode is exposed from both the mounting surface and the second end face of the blank.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2019-057580

[0004] As with the inductor component described in Patent Document 1, if the lead-out electrodes extend along the mounting surface and end face of the blank, they cover a relatively wide area around the inductor wiring. Therefore, there is a concern that the lead-out electrodes may excessively interrupt the magnetic flux when current flows in the inductor wiring. Summary of the Invention

[0005] To address the aforementioned issues, one aspect of this disclosure is an inductor component comprising: a blank having a mounting surface and a top surface that are parallel to each other, a first end face and a second end face that are parallel to each other, and a first side face and a second side face that are parallel to each other; an inductor wiring disposed inside the blank; a first lead electrode connected to a first end of the inductor wiring; and a second lead electrode connected to a second end of the inductor wiring, wherein a portion of the first lead electrode and a portion of the second lead electrode are exposed from the mounting surface, the first lead electrode being a columnar shape extending in a direction orthogonal to the mounting surface, and the first lead electrode being exposed from the first end face and the first side face.

[0006] According to the above structure, the first lead electrode is columnar and protrudes from the first end face and the first side face. That is, the first lead electrode is positioned in a columnar shape at a position biased towards the ridge line between the first end face and the first side face. Therefore, compared to the case where the first lead electrode is an L-shaped electrode that extends to the mounting surface side and covers the first end face more broadly, the area of ​​the inductor wiring disposed inside the blank by the first lead electrode can be reduced. As a result, excessive interruption of magnetic flux by the first lead electrode when current flows in the inductor wiring can be suppressed.

[0007] It can suppress the first lead electrode of the inductor component from cutting off the magnetic flux. Attached Figure Description

[0008] Figure 1 This is a 3D view of an inductor component.

[0009] Figure 2 This is a side view of the inductor component.

[0010] Figure 3 This is a bottom view of the inductor component.

[0011] Figure 4 This is a top view of the internal structure of the inductor component.

[0012] Figure 5 This is a side view of the internal structure of an inductor component.

[0013] Figure 6 yes Figure 4 A sectional view along line 6-6.

[0014] Figure 7 yes Figure 4 A sectional view along line 7-7.

[0015] Figure 8 This is a side view of the internal structure of the inductor component in the modified example.

[0016] Explanation of reference numerals in the attached figures

[0017] 10…Inductor component; 20…Blank; 21…Mounting surface; 22…Top surface; 23…First end face; 24…Second end face; 25…First side face; 26…Second side face; 30…Inductor wiring; 31…First straight section; 32…Second straight section; 33…Third straight section; 34…Fourth straight section; 40…First lead electrode; 50…Second lead electrode; 70…First cover layer; 80…Second cover layer. Detailed Implementation

[0018] The following describes one embodiment of the inductor component. Furthermore, for ease of understanding of the drawings, some components are shown in enlarged form. There are instances where the scale of the components differs from the actual scale or the scale in other drawings.

[0019] like Figure 1 As shown, the inductor component 10 includes a blank 20. The blank 20 is generally rectangular. The blank 20 is made of insulators such as glass, resin, and alumina. Figure 2As shown, one surface of the outer surface of the blank 20 is the mounting surface 21, and the surface opposite to the mounting surface 21 is the top surface 22. Therefore, the mounting surface 21 and the top surface 22 are parallel to each other. When the inductor component 10 is mounted on the circuit board, the mounting surface 21 is the surface opposite to the circuit board. Both the mounting surface 21 and the top surface 22 are rectangles of the same size. Furthermore, "same size" means substantially the same size, for example, allowing for an error of about 10 μm due to manufacturing deviations.

[0020] In the following description, the direction orthogonal to the mounting surface 21 is defined as the height direction Td, the top surface 22 side in the height direction Td is defined as the upper side, and the mounting surface 21 side in the height direction Td is defined as the lower side. Furthermore, the long side direction of the mounting surface 21 is defined as the length direction Ld, and the short side direction of the mounting surface 21 is defined as the width direction Wd. Additionally, as... Figure 2 As shown, the surface on the outer surface of the blank 20 extending in a direction orthogonal to the mounting surface 21, along the length direction Ld, is designated as the first end face 23, and the surface on the second end face along the length direction Ld is designated as the second end face 24. Therefore, the first end face 23 and the second end face 24 are parallel to each other.

[0021] And, as Figure 3 As shown, the surface on the outer surface of the blank 20 extending in a direction orthogonal to the mounting surface 21, on the first end side in the width direction Wd, is designated as the first side surface 25, and the surface on the second end side in the width direction Wd is designated as the second side surface 26. Therefore, the first side surface 25 and the second side surface 26 are parallel to each other. Furthermore, in this embodiment, the dimension of the blank 20 in the length direction Ld is 400 μm. The dimension of the blank 20 in the width direction Wd is 200 μm. The dimension of the blank 20 in the height direction Td is 200 μm.

[0022] like Figure 4 As shown, the inductor component 10 includes inductor wiring 30, a first lead electrode 40, and a second lead electrode 50. The inductor wiring 30 is disposed inside the blank 20. The inductor wiring 30 is made of a conductive material such as silver or copper. Furthermore, in Figure 4 as well as Figure 5 The internal structure of the blank 20 is shown through the blank 20.

[0023] like Figure 5 As shown, when viewed from the width direction Wd, the inductor wiring 30 follows a roughly square trajectory TR. When viewed from the width direction Wd, the inductor wiring 30 includes: a first straight section 31 corresponding to a first end side in the length direction Ld, a second straight section 32 corresponding to a second end side in the length direction Ld, a third straight section 33 corresponding to an upper side in the height direction Td, and a fourth straight section 34 corresponding to a lower side in the height direction Td. Furthermore, as... Figure 4 As shown, the inductor wiring 30 includes: five conductive layers stacked in the width direction Wd, namely the first conductive layer L1 to the fifth conductive layer L5, and a via 35 connecting the five first conductive layers L1 to the fifth conductive layers L5 in the width direction Wd.

[0024] like Figure 6 As shown, the first conductive layer L1 located on the first end side in the width direction Wd has a second straight portion 32, a third straight portion 33, and a fourth straight portion 34. The second straight portion 32, the third straight portion 33, and the fourth straight portion 34 in the first conductive layer L1 are disposed on a surface parallel to the first side surface 25. On the surface parallel to the first side surface 25, the third straight portion 33 extends in the length direction Ld. The third straight portion 33 is quadrangular prism-shaped. In the height direction Td, the third straight portion 33 is located above the center of the blank 20.

[0025] The second end of the third straight portion 33 in the first conductive layer L1 is connected to the second straight portion 32 in the length direction Ld. The second straight portion 32 is a quadrangular prism and extends in the height direction Td. The dimension of the second straight portion 32 in the extension direction is smaller than the dimension of the third straight portion 33 in the extension direction. In the length direction Ld, the second straight portion 32 is located closer to the second end than the center of the blank 20.

[0026] The lower end of the second straight portion 32 in the height direction Td of the first conductive layer L1 is connected to the fourth straight portion 34. The fourth straight portion 34 is a quadrangular prism and extends in the length direction Ld. The dimension of the fourth straight portion 34 in the length direction Ld in the first conductive layer L1 is smaller than the dimension of the third straight portion 33 in the length direction Ld. Therefore, the first end of the fourth straight portion 34 in the length direction Ld is located at a second end on the length direction Ld that is closer to the first end on the length direction Ld than the second end on the length direction Ld of the third straight portion 33 in the first conductive layer L1. Figure 4 As shown, the via 35 extends from the first end of the fourth straight portion 34 in the first conductive layer L1 in the length direction Ld to the second end in the width direction Wd.

[0027] The second end of the via 35 in the width direction Wd of the first conductive layer L1 is connected to the fourth straight portion 34 in the second conductive layer L2. The portion connecting the fourth straight portion 34 in the length direction Ld is the first end portion 34a.

[0028] like Figure 7As shown, the second conductive layer L2 has a first straight portion 31, a second straight portion 32, a third straight portion 33, and a fourth straight portion 34. The first straight portion 31, the second straight portion 32, the third straight portion 33, and the fourth straight portion 34 of the second conductive layer L2 are disposed on a surface parallel to the first side surface 25. When viewed from the width direction Wd, the first end portion 34a of the second conductive layer L2 extends in the length direction Ld to coincide with the extension direction of the fourth straight portion 34 of the first conductive layer L1.

[0029] The first end of the first end portion 34a in the second conductive layer L2 is connected to the first straight portion 31 in the length direction Ld. The first straight portion 31 of the second conductive layer L2 is a quadrangular prism and extends in the height direction Td.

[0030] The upper end of the first straight portion 31 in the height direction Td of the second conductive layer L2 is connected to the third straight portion 33. When viewed from the width direction Wd, the third straight portion 33 of the second conductive layer L2 overlaps with the third straight portion 33 of the first conductive layer L1.

[0031] The second end of the third straight portion 33 in the second conductive layer L2 along the length direction Ld is connected to the second straight portion 32. When viewed from the width direction Wd, the second straight portion 32 of the second conductive layer L2 overlaps with the second straight portion 32 of the first conductive layer L1.

[0032] The lower end of the second straight portion 32 in the second conductive layer L2 in the height direction Td is connected to the second end portion 34b in the length direction Ld of the fourth straight portion 34. The second end portion 34b is a quadrangular prism and extends in the length direction Ld. The first end of the second end portion 34b in the length direction Ld does not reach the first end portion 34a, and the second end portion 34b and the first end portion 34a are separated. When viewed from the width direction Wd, the first end portion 34a of the fourth straight portion 34 in the second conductive layer L2 is included within the range of the fourth straight portion 34 in the first conductive layer L1.

[0033] like Figure 4As shown, the via 35 extends from the first end of the second end side 34b in the second conductive layer L2 along the length direction Ld to the second end side along the width direction Wd. This via 35 connects to the first end side 34a of the fourth straight section 34 in the third conductive layer L3 of the inductor wiring 30 along the length direction Ld. The third conductive layer L3 has a first straight section 31, a second straight section 32, a third straight section 33, and a fourth straight section 34. The first straight section 31, the second straight section 32, the third straight section 33, and the fourth straight section 34 in the third conductive layer L3 are arranged on a surface parallel to the first side surface 25. Similar to the second conductive layer L2, the third conductive layer L3 extends through the first end side 34a, the first straight section 31, the third straight section 33, the second straight section 32, and the second end side 34b to form a trajectory TR depicting a quadrilateral shape. Furthermore, the space between the first end side 34a and the second end side 34b in the third conductive layer L3 is located on the second end side in the length direction Ld, which is closer to the space between the first end side 34a and the second end side 34b in the second conductive layer L2.

[0034] A via 35 extends from the first end of the second end portion 34b in the third conductive layer L3 along the length direction Ld to the second end of the width direction Wd. This via 35 connects to the first end portion 34a in the length direction Ld of the fourth straight portion 34 in the fourth conductive layer L4. The fourth conductive layer L4 has a first straight portion 31, a second straight portion 32, a third straight portion 33, and a fourth straight portion 34. The first straight portion 31, the second straight portion 32, the third straight portion 33, and the fourth straight portion 34 in the fourth conductive layer L4 are arranged on a surface parallel to the first side surface 25. Similar to the third conductive layer L3, the fourth conductive layer L4 extends through the first end portion 34a, the first straight portion 31, the third straight portion 33, the second straight portion 32, and the second end portion 34b to form a trajectory TR depicting a quadrilateral shape. Furthermore, the space between the first end side 34a and the second end side 34b in the fourth conductive layer L4 is located on the second end side in the length direction Ld, which is closer to the space between the first end side 34a and the second end side 34b in the third conductive layer L3.

[0035] A via 35 connects from the end of the second end side 34b in the fourth conductive layer L4 in the length direction Ld to the second end side in the width direction Wd. This via 35 connects to the first end side portion 34a in the length direction Ld of the fourth straight portion 34 in the fifth conductive layer L5. The fifth conductive layer L5 has a first straight portion 31, a third straight portion 33, and a fourth straight portion 34. The first straight portion 31, the third straight portion 33, and the fourth straight portion 34 in the fifth conductive layer L5 are disposed on a surface parallel to the first side surface 25. The fifth conductive layer L5 extends through the first end side 34a, the first straight portion 31, and the third straight portion 33 to form a trajectory TR depicting a quadrilateral shape.

[0036] Furthermore, in this embodiment, when viewed from the width direction Wd, the connection portion connecting the first straight section 31 and the third straight section 33 in the inductor wiring 30 has a chamfered shape. Specifically, the surface of the inductor wiring 30 on the winding center axis CA side in the connection portion between the first straight section 31 and the third straight section 33 is a curved surface. Additionally, the surface on the opposite side of the winding center axis CA in the connection portion between the first straight section 31 and the third straight section 33 is also a curved surface. Similarly, the surfaces of the inductor wiring 30 on the winding center axis CA side in the connection portions between the first straight section 31 and the fourth straight section 34, the second straight section 32 and the third straight section 33, and the second straight section 32 and the fourth straight section 34 are curved surfaces. Furthermore, the surface on the opposite side of the winding center axis CA of each connection portion is also a curved surface.

[0037] Thus, the inductor wiring 30 is a coil formed by winding through the first conductive layers L1 to the fifth conductive layers L5 and the through-holes 35 connecting the first conductive layers L1 to the fifth conductive layers L5. Furthermore, the winding center axis CA of the coiled inductor wiring 30 is aligned with the width direction Wd. That is, the winding center axis CA is orthogonal to the first side surface 25. When viewed from the width direction Wd, the winding center axis CA is located approximately at the center of the blank 20.

[0038] Furthermore, when viewed from the width direction Wd, the distance between the first straight section 31 and the second straight section 32 is greater than the distance between the third straight section 33 and the fourth straight section 34. Therefore, in this embodiment, the inner diameter of the inductor wiring 30 on the straight line that winds around the central axis CA and is orthogonal to the first end face 23 is greater than the inner diameter of the inductor wiring 30 on the straight line that winds around the central axis CA and is orthogonal to the mounting surface 21.

[0039] Moreover, such as Figure 4 As shown, a first lead electrode 40 is connected to the first end of the inductor wiring 30 in the extension direction, that is, the first end side on the length direction Ld of the third straight portion 33 in the first conductive layer L1. Figure 5As shown, the first lead-out electrode 40 is a quadrangular prism extending in the height direction Td. The upper end of the first lead-out electrode 40 is on the same horizontal plane as the upper surface of the third straight section 33. Figure 4 As shown, when viewed from the height direction Td, the first lead-out electrode 40 is square in shape. The length direction Ld of the first lead-out electrode 40 is less than one-quarter of the length direction Ld of the blank 20, which is 48 μm in this embodiment. Furthermore, the width direction Wd of the first lead-out electrode 40 is less than one-quarter of the width direction Wd of the blank 20, which is 48 μm in this embodiment. In addition, in this embodiment, the length direction Ld is parallel to both the mounting surface 21 and the first side surface 25.

[0040] like Figure 5 As shown, the dimension Td in the height direction of the first lead-out electrode 40 is more than half the dimension Td in the height direction of the blank 20, which is 185 μm in this embodiment. The lower surface of the first lead-out electrode 40 in the height direction Td is at the same level as the mounting surface 21 of the blank 20. Therefore, the lower surface of the first lead-out electrode 40 in the height direction Td is exposed from the mounting surface 21 of the blank 20. On the other hand, the upper surface of the first lead-out electrode 40 in the height direction Td is located inside the blank 20. Since the dimension Td in the height direction of the blank 20 is 200 μm, the distance from the top surface 22 of the blank 20 to the end of the first lead-out electrode 40 on the side of the top surface 22 in the height direction Td is ensured to be 15 μm. Furthermore, in this embodiment, since the shape of the first lead-out electrode 40 is a quadrangular prism, the maximum dimension of the first lead-out electrode 40 in the height direction Td is the same as the dimension of the first lead-out electrode 40 in the height direction Td.

[0041] like Figure 4 As shown, when viewed from the height direction Td, one of the four corners of the square shape of the first lead electrode 40 coincides with the corner where the virtual plane containing the first end face 23 and the virtual plane containing the first side face 25 connect. The side face of the first end of the four prism-shaped sides of the first lead electrode 40 in the length direction Ld is on the same horizontal plane as the first end face 23. Therefore, the side face of the first end of the first lead electrode 40 in the length direction Ld protrudes from the first end face 23 of the blank 20. Furthermore, the dimension of the portion of the first lead electrode 40 protruding from the first end face 23 in the width direction Wd is less than one-quarter of the dimension of the width direction Wd of the first end face 23. Therefore, when viewed from the length direction Ld, the first lead electrode 40 overlaps with the inductor wiring 30 only on the side closer to the first side face 25 than the center of the first end face 23.

[0042] The side of the first end of the four prism-shaped sides of the first lead electrode 40, in the width direction Wd, is on the same horizontal plane as the first side surface 25. Therefore, the side of the first end of the first lead electrode 40 in the width direction Wd protrudes from the first side surface 25 of the blank body 20. That is, the first lead electrode 40 protrudes from the first end face 23 and the first side surface 25 of the blank body 20. On the other hand, the first lead electrode 40 does not protrude from the second end face 24 and the second side surface 26 of the blank body 20.

[0043] Furthermore, a second lead electrode 50 is connected to the second end of the third straight portion 33 in the fifth conductive layer L5 along its length Ld, in the extension direction of the inductor wiring 30. The second lead electrode 50 has the same shape as the first lead electrode 40. For example... Figure 5 As shown, the second lead-out electrode 50 is a quadrangular prism extending in the height direction Td. The upper end of the second lead-out electrode 50 is on the same horizontal plane as the upper surface of the third straight portion 33. Figure 4 As shown, when viewed from the height direction Td, the second lead-out electrode 50 is square in shape. The length direction Ld of the second lead-out electrode 50 is less than one-quarter of the length direction Ld of the blank 20, which is 48 μm in this embodiment. Furthermore, the width direction Wd of the second lead-out electrode 50 is less than one-quarter of the width direction Wd of the blank 20, which is also 48 μm in this embodiment.

[0044] like Figure 5 As shown, the dimension Td in the height direction of the second lead-out electrode 50 is more than half the dimension Td in the height direction of the blank 20, which is 185 μm in this embodiment. The lower surface of the second lead-out electrode 50 in the height direction Td is on the same horizontal plane as the mounting surface 21 of the blank 20. Therefore, the lower surface of the second lead-out electrode 50 in the height direction Td is exposed from the mounting surface 21 of the blank 20. On the other hand, the upper surface of the second lead-out electrode 50 in the height direction Td is located inside the blank 20. Since the dimension Td in the height direction of the blank 20 is 200 μm, the distance from the top surface 22 of the blank 20 to the end of the second lead-out electrode 50 on the side of the top surface 22 in the height direction Td is ensured to be 15 μm. Furthermore, in this embodiment, since the shape of the second lead-out electrode 50 is a quadrangular prism, the maximum dimension of the second lead-out electrode 50 in the height direction Td is the same as the dimension of the second lead-out electrode 50 in the height direction Td.

[0045] like Figure 4As shown, when viewed from the height direction Td, one of the four corners of the square shape of the second lead electrode 50 coincides with the corner where the virtual plane containing the second end face 24 and the virtual plane containing the second side face 26 connect. The second end face of the four prism-shaped sides of the second lead electrode 50 in the length direction Ld is on the same horizontal plane as the second end face 24. Therefore, the second end face of the second lead electrode 50 in the length direction Ld is exposed from the second end face 24 of the blank 20. In addition, the dimension of the width direction Wd of the portion of the second lead electrode 50 exposed from the second end face 24 is less than one-quarter of the dimension of the width direction Wd of the second end face 24. Therefore, when viewed from the length direction Ld, the second lead electrode 50 overlaps with the inductor wiring 30 only on the side closer to the second side face 26 than the center of the second end face 24.

[0046] The second end face of the second lead electrode 50, in the width direction Wd of its four prism-shaped sides, is on the same horizontal plane as the second side face 26. Therefore, the second end face of the second lead electrode 50 in the width direction Wd protrudes from the second side face 26 of the blank 20. That is, the second lead electrode 50 protrudes from both the second end face 24 and the second side face 26. On the other hand, the second lead electrode 50 does not protrude from either the first end face 23 or the first side face 25.

[0047] Here, in the blank 20, when viewed from the width direction Wd, a portion of the first lead electrode 40 overlaps with the first straight portion 31 of the inductor wiring 30. In other words, when viewed from the width direction Wd, the first straight portion 31 of the inductor wiring 30 is at the position where it overlaps with the first lead electrode 40. Moreover, the extending direction of the first lead electrode 40 is parallel to the extending direction of the first straight portion 31. Furthermore, the second end face of one of the four sides of the first lead electrode 40 in the length direction Ld is on the same plane as the second end face of the first straight portion 31 in the length direction Ld. That is, when viewed from the width direction Wd, the edge of the first lead electrode 40 on the winding center axis CA side of the inductor wiring 30 coincides with the edge of the first straight portion 31 on the winding center axis CA side. Furthermore, the so-called coincidence can be substantial coincidence, for example, allowing for an error of about 10 μm caused by manufacturing, etc.

[0048] In the blank 20, when viewed from the width direction Wd, a portion of the second lead electrode 50 overlaps with the second straight portion 32 of the inductor wiring 30. In other words, when viewed from the width direction Wd, the second straight portion 32 of the inductor wiring 30 overlaps with the second lead electrode 50. Furthermore, the extending direction of the second lead electrode 50 is parallel to the extending direction of the second straight portion 32. In addition, the first end face of the second lead electrode 50 in the length direction Ld is located on the same plane as the first end face of the second straight portion 32 in the length direction Ld. That is, when viewed from the width direction Wd, the edge of the second lead electrode 50 on the winding center axis CA side of the inductor wiring 30 coincides with the edge of the second straight portion 32 on the winding center axis CA side.

[0049] Based on the aforementioned positional relationship, when viewed from the width direction Wd, the distance between the first lead electrode 40 and the second lead electrode 50 is equal to the distance between the first straight portion 31 and the second straight portion 32 in the inductor wiring 30. That is, when viewed from the width direction Wd, the distance between the first lead electrode 40 and the second lead electrode 50 is equal to the inner diameter of the straight inductor wiring 30, which passes through the winding center axis CA of the inductor wiring 30 and is orthogonal to the first end face 23. Furthermore, the so-called equal distance can be substantially equal; for example, an error of about 10 μm caused by manufacturing processes can be allowed.

[0050] A first cover layer 70 is stacked on the surface of the first lead electrode 40 that is exposed from the outer surface of the blank 20. Specifically, the first cover layer 70 is disposed on the mounting surface 21, the first end face 23, and the first side face 25. The first cover layer 70 has a double-layer structure, comprising a nickel layer 71 and a tin layer 72. A nickel layer 71, composed of nickel, is stacked on the surface of the first lead electrode 40. A tin layer 72, composed of tin, is stacked on the surface of the nickel layer 71.

[0051] A second cover layer 80 is stacked on the surface of the second lead electrode 50 that is exposed from the outer surface of the blank 20. Specifically, the second cover layer 80 is disposed on the mounting surface 21, the second end face 24, and the second side face 26. The second cover layer 80 has a double-layer structure, comprising a nickel layer 81 and a tin layer 82. A nickel layer 81, composed of nickel, is stacked on the surface of the second lead electrode 50. A tin layer 82, composed of tin, is stacked on the surface of the nickel layer 81.

[0052] like Figure 3As shown, when the inductor component 10 is viewed from the height direction Td, the first lead electrode 40 and the second lead electrode 50 are arranged on the diagonal of the quadrilateral shape. Therefore, the inductor component 10 is a double-symmetric structure with the center of rotational symmetry about the center of the mounting surface 21. Thus, the second lead electrode 50 protrudes from the blank 20, and the position where the second lead electrode 50 protrudes from the blank 20 is doubly rotationally symmetric with respect to the position where the first lead electrode 40 protrudes from the blank 20, with the center of rotation about the center of the mounting surface 21 and the height direction Td as the axis of rotation. Furthermore, as... Figure 4 As shown, when viewed from the height direction Td, the internal structure of the blank 20 of the inductor component 10 is also a double symmetry structure with the center of the blank 20 as the center of rotational symmetry.

[0053] Next, the function and effects of the above-described embodiments will be explained. Furthermore, regarding the first lead-out electrode 40 and the second lead-out electrode 50, the effects of their shared use will be described, with the first lead-out electrode 40 as an example.

[0054] (1) According to the above embodiment, the first lead-out electrode 40 is columnar. Furthermore, the first lead-out electrode 40 protrudes from both the first end face 23 and the first side face 25. That is, the first lead-out electrode 40 is positioned in a columnar shape at a position biased towards the ridge between the first end face 23 and the first side face 25. Therefore, compared to the case where the first lead-out electrode also extends to the mounting surface 21 side and is an L-shaped structure that more broadly covers the first end face 23, the area covered by the first lead-out electrode 40 within the inductor wiring 30 disposed inside the blank 20 can be reduced. As a result, excessive interruption of the magnetic flux by the first lead-out electrode 40 when current flows in the inductor wiring 30 can be suppressed.

[0055] (2) According to the above embodiment, the maximum dimension Td in the height direction of the first lead-out electrode 40 is greater than half the dimension Td in the height direction of the blank 20. Therefore, the upper end of the first lead-out electrode 40 is located at a corresponding position close to the top surface 22 of the blank 20. As a result, even if the first end of the inductor wiring 30 in the extension direction is disposed at a corresponding position close to the top surface 22, the conductive part can be led out to the mounting surface 21 through the first lead-out electrode 40.

[0056] (3) According to the above embodiment, the dimension of the width direction Wd of the first lead electrode 40 is less than one-quarter of the dimension of the width direction Wd of the blank 20. Therefore, when viewed from the height direction Td, the area occupied by the first lead electrode 40 is correspondingly reduced. As a result, the degree of freedom in designing the wiring path of the inductor wiring 30 inside the blank 20 is increased.

[0057] (4) According to the above embodiment, the length direction Ld of the first lead electrode 40 is 10 μm or more. Therefore, when manufacturing the inductor component 10, even if the cutting accuracy is reduced accordingly when the monolithic blank 20 is prepared, the size of the first lead electrode 40 can be guaranteed.

[0058] (5) According to the above embodiment, the first cover layer 70 is stacked on the surface of the first lead electrode 40 that is exposed from the blank 20. Therefore, when installing the inductor component 10, it is easy to align by using the portion protruding from the surface of the blank 20 as a marker.

[0059] (6) According to the above embodiment, the first cover layer 70 has a double-layer structure, including a nickel layer 71 made of nickel and a tin layer 72 made of tin stacked on the surface of the nickel layer 71. Therefore, due to the heat resistance of the nickel layer 71, damage to the first lead electrode 40 by molten solder can be prevented. In addition, since the solder wettability of the tin layer 72 is relatively high, the fixing strength of the solder can be improved.

[0060] (7) According to the above embodiment, when viewed from the height direction Td, the inductor component 10 has a double-symmetric structure with the center of rotational symmetry of the blank 20 as the center. Furthermore, when viewed from the height direction Td, the internal structure of the blank 20 also has a double-symmetric structure with the center of rotational symmetry of the blank 20 as the center. Therefore, even if the inductor component 10 is mounted with the length direction Ld facing opposite sides, the characteristics of the inductor component 10 are equal. As a result, when mounting the inductor component 10, the orientation of the length direction Ld is not important.

[0061] (8) According to the above embodiment, the winding center axis CA of the inductor wiring 30 extends parallel to the width direction Wd. Therefore, compared with the case where the winding center axis CA of the inductor wiring 30 is orthogonal to the mounting surface 21, when the inductor component 10 is mounted on the circuit board, the interruption of magnetic flux in the circuit board connected to the mounting surface 21 side can be suppressed.

[0062] (9) According to the above embodiment, the first lead electrode 40 is exposed from the first end face 23 to the first side face 25. In other words, the first lead electrode 40 is disposed close to the first end face in the width direction Wd. Therefore, for example, in order to ensure the distance from the first lead electrode 40, it is not necessary to make the paths of the first conductive layer L1 to the fifth conductive layer L5 of the inductor component 10 different, and it is easy to design a path in which the inner diameter of the inductor wiring 30 of each layer is consistent.

[0063] (10) According to the above embodiment, when viewed from the width direction Wd, the first lead electrode 40 overlaps with the first straight portion 31 of the inductor wiring 30. In other words, the portion of the blank 20 that is closer to the second end side of the first lead electrode 40 in the width direction Wd is effectively used as space for arranging the inductor wiring 30.

[0064] (11) According to the above embodiment, when viewed from the width direction Wd, the edge of the inductor wiring 30 of the first lead electrode 40 on the winding center axis CA side coincides with the edge of the first straight portion 31 on the winding center axis CA side. Therefore, it is possible to prevent the magnetic flux passing inside the inductor wiring 30 from colliding with the first lead electrode 40.

[0065] (12) According to the above embodiment, when viewed from the width direction Wd, the distance between the first lead electrode 40 and the second lead electrode 50 is equal to the inner diameter of the inductor wiring 30 on a straight line passing through the winding center axis CA of the inductor wiring 30 and orthogonal to the first end face 23. In other words, magnetic flux passing inside the inductor wiring 30 is prevented from colliding with the second lead electrode 50, and the inner diameter of the inductor wiring 30 is maximized.

[0066] (13) According to the above embodiment, the inner diameter of the inductor wiring 30 on the straight line that winds around the central axis CA and is orthogonal to the first end face 23 is larger than the inner diameter of the inductor wiring 30 on the straight line that winds around the central axis CA and is orthogonal to the mounting surface 21. Therefore, when viewed from the width direction Wd, in the blank 20 where the dimension in the length direction Ld is longer than the dimension in the height direction Td, the wiring path of the inductor wiring 30 can be extended by increasing the diameter of the wiring path of the inductor wiring 30.

[0067] (14) According to the above embodiment, each of the second conductive layer L2 to the fourth conductive layer L4 of the inductor wiring 30 has a first straight portion, a second straight portion, a third straight portion, and a fourth straight portion disposed on a surface parallel to the first side surface 25 inside the blank 20. Therefore, the path length of the inductor wiring 30 per unit volume of the blank 20 can be extended.

[0068] (15) According to the above embodiment, in the inductor wiring 30, the winding center axis CA side of the inductor wiring 30 at the connection points of the first straight section 31 and the third straight section 33, the connection points of the first straight section 31 and the fourth straight section 34, the connection points of the second straight section 32 and the third straight section 33, and the connection points of the second straight section 32 and the fourth straight section 34 is a curved surface. Therefore, when the current flowing in the inductor wiring 30 changes direction by 90 degrees, the direction is changed slowly, thereby suppressing current loss.

[0069] (16) According to the above embodiment, when viewed from the length direction Ld, the first lead electrode 40 overlaps with the inductor wiring 30 only on the side closest to the center of the first end face 23. In this case, when viewed from the length direction Ld, the first lead electrode 40 is not disposed at the position where it does not overlap with the inductor wiring 30. Therefore, it is more difficult for the first lead electrode 40 to interrupt the magnetic flux when current flows in the inductor wiring 30.

[0070] The above-described embodiments can be modified and implemented as follows. The above-described embodiments and the following modifications can be combined and implemented within a technically consistent framework.

[0071] The size of the billet 20 is not limited to the examples of the above embodiments. For example, the dimensions of the billet 20 in each direction may be 600 μm in the length direction Ld, 300 μm in the width direction Wd, and 300 μm in the height direction Td; or the dimensions may be 250 μm in the length direction Ld, 125 μm in the width direction Wd, and 125 μm in the height direction Td. Furthermore, for example, the dimensions of the height direction Td and the width direction Wd may not be equal, and the dimension of the height direction Td may be larger than the dimension of the length direction Ld.

[0072] • The shape of the inductor wiring 30 does not have to be a quadrangular prism. The shape of the inductor wiring 30 can also be a polygonal prism other than a quadrilateral, or it can be a cylindrical shape.

[0073] The distance from the lower end of the fourth straight section 34 to the mounting surface 21 in the inductor wiring 30 can be any value, but is preferably 10 μm or more and 20 μm or less. The smaller the distance from the lower end of the fourth straight section 34 to the mounting surface 21, the larger the trajectory TR of the inductor wiring 30 can be. On the other hand, when manufacturing the inductor component 10, by correspondingly increasing the distance from the lower end of the fourth straight section 34 to the mounting surface 21 during the monolithic blank 20, even if the cutting precision is correspondingly lower, the inductor wiring 30 is prevented from protruding from the outer surface of the blank 20. Similarly, the distance from the upper end of the third straight section 33 to the top surface 22 in the inductor wiring 30 can also be any value, but is preferably 10 μm or more and 20 μm or less.

[0074] • At the connection between the first straight section 31 and the third straight section 33, the surface of the inductor wiring 30 on the side of the winding center axis CA and the surface on the opposite side of the winding center axis CA may not be curved surfaces. For example, it may be bent at a 90-degree angle, or it may be connected by an inclined portion where both the first straight section 31 and the third straight section 33 are inclined. In this case, increasing the straight portion of the first straight section 31 and the third straight section 33 easily increases the length of the inductor wiring 30. This is also true for the connection between other straight sections.

[0075] • For the inductor wiring 30, the first straight portion 31 to the fourth straight portion 34 may not all be arranged on the surface inside the blank 20 parallel to the first side surface 25. For example, only the third straight portion 33 and the second straight portion 32 may be arranged in the first conductive layer L1, and only the fourth straight portion 34 and the first straight portion 31 may be arranged in the second conductive layer L2. In this way, even if the inductor wiring 30 is configured such that only a portion of the straight portions are arranged in a conductive layer, the entire inductor wiring 30 can be wound up.

[0076] In the inductor wiring 30, when viewed from the width direction Wd, the distance between the third straight section 33 and the fourth straight section 34 can be greater than or equal to the distance between the first straight section 31 and the second straight section 32. The distance between each straight section can be appropriately changed according to the shape of the blank 20 and the required electrical characteristics.

[0077] The positional relationship between the first straight section 31 and the first lead-out electrode 40 is not limited to the examples of the above embodiments. The surface of the first straight section 31 on the winding center axis CA side may not be arranged on the same plane as the surface of the second end side in the length direction Ld of the first lead-out electrode 40. Furthermore, for example, when viewed from the width direction Wd, the first straight section 31 may not overlap with the first lead-out electrode 40. This is also true for the positional relationship between the second straight section 32 and the second lead-out electrode 50.

[0078] • The winding center axis CA of the inductor wiring 30 may not extend in a direction orthogonal to the first side surface 25. For example, it may extend in a direction orthogonal to the first end face 23 or in a direction orthogonal to the mounting surface 21. If it extends in a direction orthogonal to any one of the outer surfaces of the blank 20, it is easy to wind inductor wiring 30 of the same diameter within the blank 20.

[0079] The shape of the inductor wiring 30 when viewed from the width direction Wd, i.e., the trajectory TR of the inductor wiring 30, is not limited to the examples of the above embodiments. For example, when viewed from the width direction Wd, the trajectory TR of the inductor wiring 30 may also be a polygon shape other than a quadrilateral, an ellipse, or a circle.

[0080] The shape of the inductor wiring 30 is not limited to the examples of the above embodiments. For example, the inductor wiring 30 may not be coil-shaped, but may be straight or curved.

[0081] The size of the first lead-out electrode 40 is not limited to the examples of the above embodiments. The smaller the dimensions of the first lead-out electrode 40 in each direction, the smaller the amount of magnetic flux cut off by the first lead-out electrode 40. On the other hand, for example, if the dimensions of the width direction Wd and the length direction Ld of the first lead-out electrode 40 are 10 μm or more, it is preferable when cutting the blank 20. Furthermore, in Figure 8 In the example shown, in the inductor component 110, the length direction Ld of the first lead electrode 140 is greater than one-quarter of the length direction Ld of the blank 20. Specifically, in this example, the length direction Ld of the first lead electrode 140 is greater than the distance from the first end face of the length direction Ld to the side of the winding center axis CA of the first straight portion 31 in the blank 20. Similarly, the length direction Ld of the second lead electrode 150 is greater than one-quarter of the length direction Ld of the blank 20. In this example, the edge of the first lead electrode 140 on the winding center axis CA side is closer to the winding center axis CA side than the edge of the first straight portion 31 on the winding center axis CA side. Furthermore, the edge of the second lead electrode 150 on the winding center axis CA side is closer to the winding center axis CA side than the edge of the second straight portion 32 on the winding center axis CA side. In this modified example, since the area of ​​the first lead electrode 140 and the second lead electrode 150 exposed from the mounting surface 21 side can be increased, it is easy to mount the inductor component 110 onto the substrate.

[0082] Regarding the position of the first lead electrode 40, when viewed from the height direction Td, one of the four corners of the square shape of the first lead electrode 40 may not coincide with the corner connecting the virtual plane containing the first end face 23 and the virtual plane containing the first side face 25. The first lead electrode 40 only needs to be exposed at least from the mounting surface 21, the first end face 23, and the first side face 25. For example, a portion of the first lead electrode 40 may be positioned at a first end side that is further along the length direction Ld than the virtual plane containing the first end face 23, and further along the width direction Wd than the virtual plane containing the first side face 25. The same applies to the second lead electrode 50.

[0083] The size of the first lead-out electrode 40 is not limited to the examples of the above embodiments. For example, the height direction Td of the first lead-out electrode 40 may be less than half the height direction Td of the blank 20. Alternatively, the height direction Td of the first lead-out electrode 40 may be the same as the height direction Td of the blank 20. In this case, the first lead-out electrode 40 is also exposed on the top surface 22 of the blank 20.

[0084] The first lead-out electrode 40 can be cylindrical in shape, or it can have a portion with a larger dimension Td in the height direction. In this case, the maximum dimension Td of the first lead-out electrode 40 in the height direction is preferably less than half the dimension Td of the blank 20 in the height direction. Furthermore, the maximum dimension can be measured by electron microscopy in a cross-section orthogonal to the mounting surface 21 that partially includes the portion with a larger dimension Td in the height direction.

[0085] The positional relationship between the first lead electrode 40 and the inductor wiring 30 is not limited to the examples of the embodiments described above. For example, when viewed from the length direction Ld, the first lead electrode 40 may not overlap with the inductor wiring 30. In this case, the blank 20 can be positioned where the first lead electrode 40 does not overlap with the inductor wiring 30 when viewed from the length direction Ld. As a result, the volume of the blank 20 in the inductor component 10 can be increased.

[0086] • The shape of the second lead-out electrode 50 may not be the same as that of the first lead-out electrode 40. Furthermore, the positional relationship between the second lead-out electrode 50 and the first lead-out electrode 40 is not limited to the examples described in the above embodiments. That is, when viewed from the height direction Td, the second lead-out electrode 50 and the first lead-out electrode 40 may not be in a doubly symmetrical positional relationship with the center of rotational symmetry of the blank 20 as the center.

[0087] • The blank 20 may not be made entirely of the same material. For example, only the surface layers of the first side 25 and the second side 26 may be colored. In this case, when mounting the inductor component 10, it is easy to visually confirm whether the mounting surface 21 of the inductor component 10 faces the circuit board side.

[0088] The structure of the first cover layer 70 is not limited to the examples of the embodiments described above. For example, it may be a structure formed by electroplating, a structure formed by coating a metal paste and sintering, or it may consist only of a tin layer 72. Furthermore, the first cover layer 70 may be omitted. When the first cover layer 70 is omitted, the portion of the first lead electrode 40 exposed from the blank 20 functions as a terminal portion for the substrate, etc. The same applies to the second cover layer 80.

Claims

1. An inductor component comprising: The blank has a mounting surface and a top surface that are parallel to each other, a first end face and a second end face that are parallel to each other, and a first side face and a second side face that are parallel to each other. The inductor wiring is arranged inside the aforementioned blank. The first lead electrode is connected to the first end of the aforementioned inductor wiring; and The second lead electrode is connected to the second end of the aforementioned inductor wiring. A portion of the first lead-out electrode and a portion of the second lead-out electrode are both exposed from the mounting surface. The first lead-out electrode is a columnar shape extending in a direction orthogonal to the mounting surface. The first lead electrode is exposed from the first end face and the first side face. The inductor wiring described above is in the form of a coil wound inside the blank. The central axis of the winding of the aforementioned inductor wiring is orthogonal to the aforementioned first side surface.

2. The inductor component according to claim 1, wherein, The maximum dimension of the first lead electrode in the direction orthogonal to the mounting surface is greater than half the dimension of the first end face in the direction orthogonal to the mounting surface.

3. The inductor component according to claim 1 or 2, wherein, The first lead-out electrode mentioned above is a square prism shape. The dimension of the portion of the first lead electrode exposed from the first end face in the direction orthogonal to the first side face is less than one-quarter of the dimension of the first end face in the direction orthogonal to the first side face.

4. The inductor component according to claim 1 or 2, wherein, The first lead-out electrode mentioned above is prism-shaped. The dimension of the first lead electrode in the direction orthogonal to the first end face is 10 μm or more.

5. The inductor component according to claim 1 or 2, wherein, At least one surface of the first lead-out electrode exposed from the mounting surface is covered with a first covering layer.

6. The inductor component according to claim 5, wherein, The aforementioned first covering layer has: A nickel layer is stacked on the surface of the first lead-out electrode exposed from the blank; and A tin layer is stacked on the surface of the aforementioned nickel layer.

7. The inductor component according to claim 1 or 2, wherein, The aforementioned second lead-out electrode is a columnar shape extending in a direction orthogonal to the aforementioned mounting surface. The second lead electrode is exposed from the second end face and the second side face.

8. The inductor component according to claim 7, wherein, The second lead electrode has the same shape as the first lead electrode. It is exposed from the blank at a position that is doubly symmetrical about the center of the mounting surface and the direction orthogonal to the mounting surface, relative to the position where the first lead electrode is exposed from the blank.

9. The inductor component according to claim 1, wherein, The first lead electrode is not exposed from the second end face or the second side face.

10. The inductor component according to claim 1 or 9, wherein, When viewed from the direction extending from the central axis, the first lead electrode overlaps with a portion of the inductor wiring.

11. The inductor component according to claim 10, wherein, When viewed from the direction extending from the central axis, at the location where the first lead electrode overlaps with a portion of the inductor wiring, the extending direction of the first lead electrode is parallel to the extending direction of the inductor wiring. When viewed from the direction extending from the central axis, the edge of the first lead electrode at the overlapping position on the central axis side coincides with the edge of the inductor wiring on the central axis side.

12. The inductor component according to claim 11, wherein, The aforementioned second lead-out electrode is a columnar shape extending in a direction orthogonal to the aforementioned mounting surface. The second lead electrode is exposed from the second end face and the second side face. Viewed from the direction extending from the central axis, the distance between the first lead electrode and the second lead electrode is equal to the inner diameter of the inductor wiring on a straight line passing through the central axis and orthogonal to the first end face.

13. The inductor component according to claim 12, wherein, The above inductor wiring includes: The first straight section is disposed on the side closer to the first end face than the center of the blank and extends in a direction orthogonal to the mounting surface. as well as The second straight portion is disposed closer to the second end face than the center of the blank and extends in a direction orthogonal to the mounting surface. The inner diameter of the inductor wiring on the straight line passing through the central axis and orthogonal to the first end face is greater than the inner diameter of the inductor wiring on the straight line passing through the central axis and orthogonal to the mounting surface, and is equal to the distance between the first straight section and the second straight section.

14. The inductor component according to claim 13, wherein, The above inductor wiring includes: The third straight section is disposed on the side opposite to the mounting surface of the above-mentioned blank and extends in a direction orthogonal to the first end face; as well as The fourth straight section is disposed closer to the mounting surface than the center of the blank and extends in a direction orthogonal to the first end face. The first straight section, the second straight section, the third straight section, and the fourth straight section are arranged on the surface inside the blank that is parallel to the first side.

15. The inductor component according to claim 14, wherein, The central axis side of the connection between the first straight section and the third straight section, the connection between the first straight section and the fourth straight section, the connection between the second straight section and the third straight section, and the connection between the second straight section and the fourth straight section is a curved surface.

16. The inductor component according to claim 10, wherein, At the aforementioned overlapping location, the extending direction of the first lead electrode is parallel to the extending direction of the inductor wiring. When viewed from the direction extending from the central axis, at the overlapping position, the edge of the first lead electrode on the central axis side is closer to the central axis side than the edge of the part of the inductor wiring on the central axis side.

17. The inductor component according to claim 1, wherein, In a direction orthogonal to the mounting surface, the distance from the top surface to the top surface end of the first lead electrode, the distance from the top surface to the top surface end of the inductor wiring, and the distance from the mounting surface to the mounting surface end of the inductor wiring are all 10 μm or more and 20 μm or less.

18. The inductor component according to claim 1 or 2, wherein, Viewed from a direction orthogonal to the first end face, the first lead electrode does not overlap with the inductor wiring.

19. The inductor component according to claim 1 or 2, wherein, Viewed from a direction orthogonal to the first end face, the first lead electrode overlaps with the inductor wiring only on the side of the first side face, which is closer to the center of the first end face.

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