Electronic components

Abstract

The electronic component includes a body and a terminal electrode. The body has an outer surface provided with a recess. The terminal electrode is arranged on the body. The terminal electrode includes a first electrode portion arranged in the recess and a second electrode portion protruding from the recess. The second electrode portion is thicker than the first electrode portion.

Description

Technical Field

[0001] The present invention relates to an electronic component. Background Art

[0002] Japanese Patent Application Publication No. 2017-73536 discloses a laminated inductor including a component body formed by laminating a plurality of insulating layers, a coil conductor disposed inside the component body, and an external terminal electrode electrically connected to the coil conductor. In the laminated inductor, the external terminal electrode is embedded inside the component body.

[0003] In the above-mentioned laminated inductor, when the component body and the external terminal electrodes are formed by, for example, co-firing, cracks may be generated due to the difference in thermal shrinkage rate. Summary of the invention

[0004] One aspect of the present invention provides an electronic component in which generation of cracks is suppressed.

[0005] An electronic component according to one aspect of the present invention comprises a body and a terminal electrode. The body has an outer surface provided with a recess. The terminal electrode is arranged on the body. The terminal electrode has a first electrode portion arranged in the recess and a second electrode portion protruding from the recess. The second electrode portion is thicker than the first electrode portion.

[0006] In this electronic component, a recess is provided on the outer surface of the element body. In addition to the first electrode portion disposed in the recess, the terminal electrode also has a second electrode portion protruding from the recess. Therefore, compared with a case where the terminal electrode does not have the second electrode portion, that is, a case where the terminal electrode is entirely disposed in the recess, for example, when the element body and the terminal electrode are fired at the same time, the stress generated between the element body and the terminal electrode due to the difference in thermal shrinkage is reduced. As a result, the generation of cracks is suppressed. Moreover, because the second electrode portion is thicker than the first electrode portion, the generation of cracks is further suppressed.

[0007] The outer surface may also have a main surface constituting the mounting surface and an end surface adjacent to the main surface. The recess may also have an end surface recess provided on the end surface and a main surface recess provided on the main surface. The first electrode portion may also include a first end surface electrode portion arranged in the end surface recess and a first main surface electrode portion arranged in the main surface recess. The second electrode portion may also include a second end surface electrode portion protruding from the end surface recess and a second main surface electrode portion protruding from the main surface recess. In this case, since the terminal electrode is provided not only on the main surface side of the element body but also on the end surface side, peeling of the terminal electrode is suppressed.

[0008] The element body may also be in the shape of a rectangular parallelepiped. The outer surface may also have a first main surface constituting a mounting surface, a second main surface opposite to the first main surface, a pair of side surfaces opposite to each other, and a pair of end surfaces opposite to each other. The length of the electronic component in the relative direction of the pair of side surfaces may also be less than 1 mm. The length of the electronic component in the relative direction of the pair of end surfaces may also be less than 2 mm. In this case, the generation of cracks is also suppressed.

[0009] The element body may include a sintered body of an insulating material. The terminal electrode may include a sintered body of a conductive material. In this case, cracks generated due to the difference in thermal shrinkage between the insulating material and the conductive material can be suppressed.

[0010] The electronic component may include a plurality of terminal electrodes. In this case, the occurrence of cracks caused by each terminal electrode is further suppressed.

[0011] The electronic component may further include a coil disposed in the element body. The terminal electrode may be connected to the coil. In this case, the generation of cracks is also suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a perspective view showing a laminated coil component according to one embodiment.

[0013] Figure 2 Yes means Figure 1 An exploded perspective view of a stacked coil component.

[0014] Figure 3 Yes means Figure 1 A three-dimensional view of the body shown.

[0015] Figure 4 Yes means Figure 1 A top view of a stacked coil component.

[0016] Figure 5 It is a graph showing the relationship between the crack generation rate and the amount of buried terminal electrode. DETAILED DESCRIPTION

[0017] Hereinafter, the embodiments will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or corresponding elements are denoted by the same reference numerals, and repeated descriptions are omitted.

[0018] like Figure 1 As shown, the laminated coil component 1 includes a rectangular parallelepiped element 2 and a plurality of (a pair in this case) terminal electrodes 4, 5 arranged on the element 2. The pair of terminal electrodes 4, 5 are respectively arranged at both ends of the element 2. The rectangular parallelepiped shape includes a rectangular parallelepiped shape with chamfered corners and ridges and a rectangular parallelepiped shape with rounded corners and ridges.

[0019] The element body 2 has a pair of end faces 2a and 2b opposite to each other, a pair of main faces 2c and 2d opposite to each other, and a pair of side faces 2e and 2f opposite to each other as outer surfaces. Hereinafter, the direction in which the pair of main faces 2c and 2d are opposite to each other is referred to as the first direction D1, the direction in which the pair of end faces 2a and 2b are opposite to each other is referred to as the second direction D2, and the direction in which the pair of side faces 2e and 2f are opposite to each other is referred to as the third direction D3. In the present embodiment, the first direction D1 is the height direction of the element body 2. The second direction D2 is the length direction of the element body 2, which is orthogonal to the first direction D1. The third direction D3 is the width direction of the element body 2, which is orthogonal to the first direction D1 and the second direction D2.

[0020] A pair of end faces 2a, 2b extend along the first direction D1 in a manner connecting a pair of main faces 2c, 2d. A pair of end faces 2a, 2b also extend along the third direction D3, i.e., the short side direction of a pair of main faces 2c, 2d. A pair of side faces 2e, 2f extend along the first direction D1 in a manner connecting a pair of main faces 2c, 2d. A pair of side faces 2e, 2f also extend along the second direction D2, i.e., the long side direction of a pair of main faces 2c, 2d. The stacked coil component 1 is mounted on an electronic device (e.g., a circuit board or an electronic component) by solder, for example.

[0021] In the laminated coil component 1, the main surface 2c constitutes a mounting surface opposite to the electronic device. A pair of end surfaces 2a, 2b are adjacent to the main surface 2c. The length (height) of the first direction D1 of the laminated coil component 1 is, for example, greater than 0.05 mm and less than 1 mm. The length (length) of the second direction D2 of the laminated coil component 1 is, for example, greater than 0.01 mm and less than 2 mm. The length (width) of the third direction D3 of the laminated coil component 1 is, for example, greater than 0.05 mm and less than 1 mm.

[0022] like Figure 2 As shown, the element body 2 is composed of a plurality of insulator layers 6 stacked in the third direction D3. The element body 2 has a plurality of stacked insulator layers 6. In the element body 2, the stacking direction of the plurality of insulator layers 6 is consistent with the third direction D3. In the actual element body 2, the insulator layers 6 are integrated to such an extent that the boundaries between the insulator layers 6 are not recognizable.

[0023] Each insulator layer 6 includes, for example, a sintered body of an insulating material. Therefore, it can be said that the element body 2 includes, for example, a sintered body of an insulating material. Each insulator layer 6 is composed of, for example, a sintered body of a magnetic material. The magnetic material includes, for example, a Ni-Cu-Zn ferrite material, a Ni-Cu-Zn-Mg ferrite material, or a Ni-Cu ferrite material. The magnetic material constituting each insulator layer 6 may also include an Fe alloy. Each insulator layer 6 may also be composed of a sintered body of a non-magnetic material. The non-magnetic material includes, for example, a glass ceramic material or a dielectric material. In the present embodiment, each insulator layer 6 is composed of a sintered body of a green sheet containing a magnetic material.

[0024] like Figure 3 As shown, recesses 7 and 8 are provided on the outer surface of the element body 2. The recesses 7 and 8 are spaces recessed inward from the outer surface of the element body 2. When viewed from the third direction D3, the recesses 7 and 8 are L-shaped. The recesses 7 and 8 are separated from each other in the second direction D2.

[0025] The concave portion 7 is provided on the end face 2a side of the element body 2. The concave portion 7 includes an end face concave portion 7a provided on the end face 2a and a main face concave portion 7b provided on the main face 2c. The end face concave portion 7a and the main face concave portion 7b are provided integrally with each other. The end face concave portion 7a is arranged on the main face 2c side of the end face 2a. The bottom surface of the end face concave portion 7a is parallel to the end faces 2a and 2b. The bottom surface of the main face concave portion 7b is parallel to the main faces 2c and 2d.

[0026] The concave portion 8 is provided on the end face 2b side of the element body 2. The concave portion 8 includes an end face concave portion 8a provided on the end face 2b and a main face concave portion 8b provided on the main face 2c. The end face concave portion 8a and the main face concave portion 8b are provided integrally with each other. The end face concave portion 8a is arranged on the main face 2c side of the end face 2b. The bottom surface of the end face concave portion 8a is parallel to the end faces 2a and 2b. The bottom surface of the main face concave portion 8b is parallel to the main faces 2c and 2d.

[0027] like Figure 1 As shown, a pair of terminal electrodes 4, 5 are separated from each other in the second direction D2. When viewed from the third direction D3, the terminal electrodes 4, 5 are L-shaped. Each terminal electrode 4, 5 includes, for example, a sintered body of a conductive material. The conductive material includes, for example, Ag or Pd. Each terminal electrode 4, 5 is configured as a sintered body of a conductive paste containing a conductive material powder. The conductive material powder includes, for example, Ag powder or Pd powder. A plating layer may also be formed on the surface of each terminal electrode 4, 5. The plating layer is formed by, for example, electroplating or electroless plating. The plating layer includes, for example, Ni, Sn, or Au.

[0028] The terminal electrode 4 is arranged on the end face 2a side of the element body 2. The terminal electrode 4 is arranged over the end face 2a and the main surface 2c. The terminal electrode 4 is provided in the recess 7 (see Figure 3 The terminal electrode 4 has a recessed portion 7a provided on the end surface (see Figure 3 ) and the electrode portion 4a and the recessed portion 7b provided on the main surface (see Figure 3 ) of the electrode portion 4b. The electrode portions 4a and 4b are provided integrally with each other. The electrode portions 4a and 4b are connected to each other at the ridgeline portion of the element body 2 and are electrically connected to each other.

[0029] The electrode portion 4a extends along the first direction D1. When viewed from the second direction D2, the electrode portion 4a is in a rectangular shape. When viewed from the second direction D2, the electrode portion 4a is separated from the main surface 2d, the side surface 2e, and the side surface 2f. The electrode portion 4b extends along the second direction D2. When viewed from the first direction D1, the electrode portion 4b is in a rectangular shape. When viewed from the first direction D1, the electrode portion 4b is separated from the end surface 2b, the side surface 2e, and the side surface 2f. Each electrode portion 4a, 4b extends along the third direction D3.

[0030] The terminal electrode 5 is arranged on the end face 2b side of the element body 2. The terminal electrode 5 is arranged over the end face 2b and the main surface 2c. The terminal electrode 5 is provided in the recess 8 (see Figure 3 The terminal electrode 5 has a recessed portion 8a provided on the end surface (see Figure 3 ) and the electrode portion 5a and the recessed portion 8b provided on the main surface (see Figure 3 ) of the electrode portion 5b. The electrode portions 5a and 5b are provided integrally with each other. The electrode portions 5a and 5b are connected to each other at the ridgeline portion of the element body 2 and are electrically connected to each other.

[0031] The electrode portion 5a extends along the first direction D1. When viewed from the second direction D2, the electrode portion 5a is in a rectangular shape. When viewed from the second direction D2, the electrode portion 5a is separated from the main surface 2d, the side surface 2e, and the side surface 2f. The electrode portion 5b extends along the second direction D2. When viewed from the first direction D1, the electrode portion 5b is in a rectangular shape. When viewed from the first direction D1, the electrode portion 5b is separated from the end surface 2a, the side surface 2e, and the side surface 2f. Each electrode portion 5a, 5b extends along the third direction D3.

[0032] like Figure 4 As shown, the terminal electrode 4 has an electrode portion 41 arranged in the recess 7 and an electrode portion 42 arranged outside the recess 7. In the present embodiment, the terminal electrode 4 is composed of the electrode portion 41 and the electrode portion 42. The electrode portion 41 is buried in the recess 7. The electrode portion 41 has a shape corresponding to the shape of the recess 7. The electrode portion 42 protrudes from the recess 7. The electrode portions 41 and 42 are integrally provided with each other. The electrode portions 41 and 42 are adjacent to each other in the thickness direction of the terminal electrode 4.

[0033] The electrode portion 41 includes an electrode portion 41a buried in the end surface concave portion 7a and an electrode portion 41b buried in the main surface concave portion 7b. The electrode portion 41a has a shape corresponding to the end surface concave portion 7a. The electrode portion 41a is buried in the end surface concave portion 7a and is located on the inner side of the element body 2 than the end surface 2a. The electrode portion 41b has a shape corresponding to the main surface concave portion 7b. The electrode portion 41b is buried in the main surface concave portion 7b and is located on the inner side of the element body 2 than the main surface 2c. The electrode portions 41a and 41b are provided integrally with each other. The electrode portions 41a and 41b are connected to each other at the ridgeline portion of the element body 2 and are electrically connected to each other.

[0034] The electrode portion 42 includes an electrode portion 42a protruding from the end surface recess 7a and an electrode portion 42b protruding from the main surface recess 7b. The electrode portion 42a protrudes from the end surface 2a and is located on the outside of the element body 2 more than the end surface 2a. The electrode portion 42b protrudes from the main surface 2c and is located on the outside of the element body 2 more than the main surface 2c. The electrode portions 42a and 42b are provided integrally with each other. The electrode portions 42a and 42b are connected to each other at the ridgeline portion of the element body 2 and are electrically connected to each other. The electrode portions 41a and 42a constitute the electrode portion 4a. The electrode portions 41b and 42b constitute the electrode portion 4b.

[0035] The electrode portion 42 is thicker than the electrode portion 41. That is, the amount of the terminal electrode 4 protruding from the recess 7 (hereinafter, the amount of the terminal electrode 4 protruding) is greater than the amount of the terminal electrode 4 buried in the recess 7 (hereinafter, the amount of the terminal electrode 4 buried). The amount of the terminal electrode 4 protruding can be made to be the maximum value, that is, the amount of the protrusion of the portion of the terminal electrode 4 protruding the highest from the recess 7. The amount of the terminal electrode 4 buried can be made to be the maximum value, that is, the amount of the portion of the terminal electrode 4 buried the deepest in the recess 7.

[0036] The protrusion amount and buried amount of the terminal electrode 4 can be measured, for example, as described below. First, a cross-sectional view is obtained when the laminated coil component 1 is cut with a plane orthogonal to the third direction D3. The cross section at this time can be, for example, a plane orthogonal to the third direction D3 and located at an equal distance from a pair of side surfaces 2e and 2f. Next, the protrusion amount and buried amount of the terminal electrode 4 are measured by the cross-sectional view obtained by image analysis. The protrusion amount and buried amount of the terminal electrode 4 can also be the average value of multiple measurement results in multiple cross-sectional views orthogonal to the third direction D3, for example.

[0037] The electrode portion 42a is thicker than the electrode portion 41a, and the electrode portion 42b is thicker than the electrode portion 41b. That is, the amount of the electrode portion 4a protruding from the end surface recess 7a is greater than the amount of the electrode portion 4a buried in the end surface recess 7a, and the amount of the electrode portion 4b protruding from the main surface recess 7b is greater than the amount of the electrode portion 4b buried in the main surface recess 7b. In other words, the length of the second direction D2 of the electrode portion 42a is longer than the length of the second direction D2 of the electrode portion 41a, and the length of the first direction D1 of the electrode portion 42b is longer than the length of the first direction D1 of the electrode portion 41b.

[0038] like Figure 2As shown, the terminal electrode 4 is composed of a plurality of electrode layers 10 stacked together. In the present embodiment, the terminal electrode 4 has a plurality of electrode layers 10 stacked together. In the present embodiment, the number of electrode layers 10 is "9". Each electrode layer 10 is provided in a defective portion formed in the corresponding insulator layer 6. The electrode layer 10 is formed by firing a conductive paste provided in the defective portion formed in the raw sheet. The raw sheet and the conductive paste are fired simultaneously. Therefore, when the insulator layer 6 is obtained from the raw sheet, the electrode layer 10 is obtained from the conductive paste. In the actual terminal electrode 4, each electrode layer 10 is integrated to the extent that the boundaries between the electrode layers 10 are not recognizable. Through the defective portion formed in the raw sheet, a recessed portion 7 in which the terminal electrode 4 is arranged in the fired element body 2 can be obtained.

[0039] When viewed from the third direction D3, each electrode layer 10 is L-shaped. The electrode layer 10 has a plurality of layer portions 10a and 10b. In the present embodiment, the electrode layer 10 has a pair of layer portions 10a and 10b. The layer portion 10a extends along the first direction D1. The layer portion 10b extends along the second direction D2. The electrode portion 4a is formed by stacking the layer portions 10a of each electrode layer 10. In the electrode portion 4a, the layer portions 10a are integrated to such an extent that the boundaries between the layer portions 10a are not recognizable. The electrode portion 4b is formed by stacking the layer portions 10b of each electrode layer 10. In the electrode portion 4b, the layer portions 10b are integrated to such an extent that the boundaries between the layer portions 10b are not recognizable.

[0040] like Figure 4 As shown, the terminal electrode 5 has an electrode portion 51 arranged in the recess 8 and an electrode portion 52 arranged outside the recess 8. In the present embodiment, the terminal electrode 5 is composed of the electrode portion 51 and the electrode portion 52. The electrode portion 51 is buried in the recess 8. The electrode portion 51 has a shape corresponding to the shape of the recess 8. The electrode portion 52 protrudes from the recess 8. The electrode portions 51 and 52 are integrally provided with each other. The electrode portions 51 and 52 are adjacent to each other in the thickness direction of the terminal electrode 5.

[0041] The electrode portion 51 includes an electrode portion 51a buried in the end surface concave portion 8a and an electrode portion 51b buried in the main surface concave portion 8b. The electrode portion 51a has a shape corresponding to the end surface concave portion 8a. The electrode portion 51a is buried in the end surface concave portion 8a and is located on the inner side of the element body 2 closer to the end surface 2b. The electrode portion 51b has a shape corresponding to the main surface concave portion 8b. The electrode portion 51b is buried in the main surface concave portion 8b and is located on the inner side of the element body 2 closer to the main surface 2c. The electrode portions 51a and 51b are provided integrally with each other. The electrode portions 51a and 51b are connected to each other at the ridgeline portion of the element body 2 and are electrically connected to each other.

[0042] The electrode portion 52 includes an electrode portion 52a protruding from the end surface recess 8a and an electrode portion 52b protruding from the main surface recess 8b. The electrode portion 52a protrudes from the end surface 2b and is located on the outside of the element body 2 than the end surface 2b. The electrode portion 52b protrudes from the main surface 2c and is located on the outside of the element body 2 than the main surface 2c. The electrode portions 52a and 52b are provided integrally with each other. The electrode portions 52a and 52b are connected to each other at the ridgeline portion of the element body 2 and are electrically connected to each other. The electrode portions 51a and 52a constitute the electrode portion 5a. The electrode portions 51b and 52b constitute the electrode portion 5b.

[0043] The electrode portion 52 is thicker than the electrode portion 51. That is, the amount of the terminal electrode 5 protruding from the recessed portion 8 (hereinafter, the amount of the terminal electrode 5 protruding) is greater than the amount of the terminal electrode 5 buried in the recessed portion 8 (hereinafter, the amount of the terminal electrode 5 buried). The amount of the terminal electrode 5 protruding can be made to be the maximum value, that is, the amount of the protrusion of the portion of the terminal electrode 5 that protrudes the highest from the recessed portion 8. The amount of the terminal electrode 5 buried can be made to be the maximum value, that is, the amount of the portion of the terminal electrode 5 that is buried the deepest in the recessed portion 8.

[0044] The protrusion amount and buried amount of the terminal electrode 5 can be measured, for example, as described below. First, a cross-sectional view is obtained when the laminated coil component 1 is cut with a plane orthogonal to the third direction D3. The cross section at this time can be, for example, a plane orthogonal to the third direction D3 and located at an equal distance from a pair of side surfaces 2e and 2f. Next, the protrusion amount and buried amount of the terminal electrode 5 are measured by the cross-sectional view obtained by image analysis. The protrusion amount and buried amount of the terminal electrode 5 can also be, for example, the average value of multiple measurement results in multiple cross-sectional views orthogonal to the third direction D3.

[0045] The electrode portion 52a is thicker than the electrode portion 51a, and the electrode portion 52b is thicker than the electrode portion 51b. That is, the amount of the electrode portion 5a protruding from the end surface recess 8a is greater than the amount of the electrode portion 5a buried in the end surface recess 8a, and the amount of the electrode portion 5b protruding from the main surface recess 8b is greater than the amount of the electrode portion 5b buried in the main surface recess 8b. In other words, the length of the second direction D2 of the electrode portion 52a is longer than the length of the second direction D2 of the electrode portion 51a, and the length of the first direction D1 of the electrode portion 52b is longer than the length of the first direction D1 of the electrode portion 51b.

[0046] like Figure 2As shown, the terminal electrode 5 is composed of a plurality of electrode layers 11 stacked. In the present embodiment, the terminal electrode 5 has a plurality of electrode layers 11 stacked. In the present embodiment, the number of electrode layers 11 is "9". Each electrode layer 11 is provided in a defective portion formed in the corresponding insulator layer 6. The electrode layer 11 is formed by firing a conductive paste provided in the defective portion formed in the raw sheet. The raw sheet and the conductive paste are fired simultaneously. Therefore, when the insulator layer 6 is obtained from the raw sheet, the electrode layer 11 is obtained from the conductive paste. In the actual terminal electrode 5, each electrode layer 11 is integrated to the extent that the boundaries between the electrode layers 11 are not recognizable. Through the defective portion formed in the raw sheet, a recessed portion 8 in which the terminal electrode 5 is arranged in the fired element body 2 can be obtained.

[0047] When viewed from the third direction D3, each electrode layer 11 is L-shaped. The electrode layer 11 has a plurality of layer portions 11a and 11b. In the present embodiment, the electrode layer 11 has a pair of layer portions 11a and 11b. The layer portion 11a extends along the first direction D1. The layer portion 11b extends along the second direction D2. The electrode portion 5a is formed by stacking the layer portions 11a of each electrode layer 11. In the electrode portion 5a, the layer portions 11a are integrated to such an extent that the boundaries between the layer portions 11a are not recognizable. The electrode portion 5b is formed by stacking the layer portions 11b of each electrode layer 11. In the electrode portion 5b, the layer portions 11b are integrated to such an extent that the boundaries between the layer portions 11b are not recognizable.

[0048] like Figure 4 As shown, the laminated coil component 1 includes a coil 9 disposed in the element body 2. The coil axis of the coil 9 extends along the third direction D3. When viewed from the third direction D3, the outer shape of the coil 9 is substantially rectangular.

[0049] like Figure 2 As shown, coil 9 (refer to Figure 4) has a first coil conductor 20, a second coil conductor 21, a third coil conductor 22, a fourth coil conductor 23 and a fifth coil conductor 24. The first coil conductor 20, the second coil conductor 21, the third coil conductor 22, the fourth coil conductor 23 and the fifth coil conductor 24 are arranged in the order of the first coil conductor 20, the second coil conductor 21, the third coil conductor 22, the fourth coil conductor 23 and the fifth coil conductor 24 along the third direction D3. The first coil conductor 20, the second coil conductor 21, the third coil conductor 22, the fourth coil conductor 23 and the fifth coil conductor 24 are in a substantially rectangular shape in which a part of the loop is interrupted, and have one end and the other end. The first coil conductor 20, the second coil conductor 21, the third coil conductor 22, the fourth coil conductor 23 and the fifth coil conductor 24 have a portion extending linearly along the first direction D1 and a portion extending linearly along the second direction D2. The first coil conductor 20, the second coil conductor 21, the third coil conductor 22, the fourth coil conductor 23 and the fifth coil conductor 24 are formed with a predetermined width.

[0050] Coil 9 (refer to Figure 4 ) has a first connecting conductor 30, a second connecting conductor 31, a third connecting conductor 32 and a fourth connecting conductor 33. The first connecting conductor 30, the second connecting conductor 31, the third connecting conductor 32 and the fourth connecting conductor 33 are arranged in the order of the first connecting conductor 30, the second connecting conductor 31, the third connecting conductor 32 and the fourth connecting conductor 33 along the third direction D3. When viewed from the third direction D3, the first connecting conductor 30, the second connecting conductor 31, the third connecting conductor 32 and the fourth connecting conductor 33 are substantially rectangular.

[0051] The first coil conductor 20 is located in the same layer as one electrode layer 10 and one electrode layer 11. The first coil conductor 20 is connected to the electrode layer 11 via a connecting conductor 25. The connecting conductor 25 is located in the same layer as the first coil conductor 20. One end of the first coil conductor 20 is connected to the connecting conductor 25. The connecting conductor 25 is connected to the layer portion 11a. The connecting conductor 25 connects the first coil conductor 20 and the electrode layer 11. The connecting conductor 25 may also be connected to the layer portion 11b. The first coil conductor 20 is separated from the electrode layer 10 located in the same layer. In the present embodiment, the first coil conductor 20, the connecting conductor 25 and the electrode layer 11 are formed integrally.

[0052] The first connecting conductor 30 is arranged on the insulating layer 6 between the first coil conductor 20 and the second coil conductor 21. One electrode layer 10 and one electrode layer 11 are located on the insulating layer 6 where the first connecting conductor 30 is arranged. The first connecting conductor 30 is separated from the electrode layers 10 and 11 located on the same layer. When viewed from the third direction D3, the first connecting conductor 30 is arranged to overlap with the other end of the first coil conductor 20 and one end of the second coil conductor 21. The first connecting conductor 30 is connected to the other end of the first coil conductor 20 and to one end of the second coil conductor 21. The first connecting conductor 30 connects the first coil conductor 20 and the second coil conductor 21.

[0053] The second coil conductor 21 is located in the same layer as one electrode layer 10 and one electrode layer 11. The second coil conductor 21 is separated from the electrode layers 10 and 11 located in the same layer. The first coil conductor 20 and the second coil conductor 21 are adjacent to each other in the third direction D3 with the insulator layer 6 interposed between the first coil conductor 20 and the second coil conductor 21. When viewed from the third direction D3, one end of the second coil conductor 21 overlaps with the other end of the first coil conductor 20 via the first connecting conductor 30.

[0054] The second connecting conductor 31 is arranged on the insulating layer 6 between the second coil conductor 21 and the third coil conductor 22. One electrode layer 10 and one electrode layer 11 are located on the insulating layer 6 where the second connecting conductor 31 is arranged. The second connecting conductor 31 is separated from the electrode layers 10 and 11 located on the same layer. When viewed from the third direction D3, the second connecting conductor 31 is arranged to overlap with the other end of the second coil conductor 21 and one end of the third coil conductor 22. The second connecting conductor 31 is connected to the other end of the second coil conductor 21 and to one end of the third coil conductor 22. The second connecting conductor 31 connects the second coil conductor 21 and the third coil conductor 22.

[0055] The third coil conductor 22 is located in the same layer as one electrode layer 10 and one electrode layer 11. The third coil conductor 22 is separated from the electrode layers 10 and 11 located in the same layer. The second coil conductor 21 and the third coil conductor 22 are adjacent to each other in the third direction D3 with the insulator layer 6 interposed between the second coil conductor 21 and the third coil conductor 22. When viewed from the third direction D3, one end of the third coil conductor 22 overlaps with the other end of the second coil conductor 21 via the second connecting conductor 31.

[0056] The third connecting conductor 32 is arranged on the insulating layer 6 between the third coil conductor 22 and the fourth coil conductor 23. One electrode layer 10 and one electrode layer 11 are located on the insulating layer 6 where the third connecting conductor 32 is arranged. The third connecting conductor 32 is separated from the electrode layers 10 and 11 located on the same layer. When viewed from the third direction D3, the third connecting conductor 32 is arranged to overlap with the other end of the third coil conductor 22 and one end of the fourth coil conductor 23. The third connecting conductor 32 is connected to the other end of the third coil conductor 22 and to one end of the fourth coil conductor 23. The third connecting conductor 32 connects the third coil conductor 22 and the fourth coil conductor 23.

[0057] The fourth coil conductor 23 is located in the same layer as one electrode layer 10 and one electrode layer 11. The fourth coil conductor 23 is separated from the electrode layers 10 and 11 located in the same layer. The third coil conductor 22 and the fourth coil conductor 23 are adjacent to each other in the third direction D3 with the insulator layer 6 interposed between the third coil conductor 22 and the fourth coil conductor 23. When viewed from the third direction D3, one end of the fourth coil conductor 23 overlaps with the other end of the third coil conductor 22 via the third connecting conductor 32.

[0058] The fourth connecting conductor 33 is arranged on the insulating layer 6 between the fourth coil conductor 23 and the fifth coil conductor 24. One electrode layer 10 and one electrode layer 11 are located on the insulating layer 6 where the fourth connecting conductor 33 is arranged. The fourth connecting conductor 33 is separated from the electrode layers 10 and 11 located on the same layer. When viewed from the third direction D3, the fourth connecting conductor 33 is arranged to overlap with the other end of the fourth coil conductor 23 and one end of the fifth coil conductor 24. The fourth connecting conductor 33 is connected to the other end of the fourth coil conductor 23 and to one end of the fifth coil conductor 24. The fourth connecting conductor 33 connects the fourth coil conductor 23 and the fifth coil conductor 24.

[0059] The fifth coil conductor 24 is located in the same layer as one electrode layer 10 and one electrode layer 11. When viewed from the third direction D3, one end of the fifth coil conductor 24 overlaps with the other end of the fourth coil conductor 23 via the fourth connecting conductor 33. The fifth coil conductor 24 is connected to the electrode layer 10 via the connecting conductor 26. The connecting conductor 26 is located in the same layer as the fifth coil conductor 24. The other end of the fifth coil conductor 24 is connected to the connecting conductor 26. The connecting conductor 26 is connected to the layer portion 10a. The connecting conductor 26 connects the fifth coil conductor 24 and the electrode layer 10. The connecting conductor 26 may also be connected to the layer portion 10b. The fifth coil conductor 24 is separated from the electrode layer 11 located in the same layer. In the present embodiment, the fifth coil conductor 24, the connecting conductor 26 and the electrode layer 10 are formed integrally.

[0060] The first coil conductor 20, the second coil conductor 21, the third coil conductor 22, the fourth coil conductor 23, and the fifth coil conductor 24 are electrically connected via the first connection conductor 30, the second connection conductor 31, the third connection conductor 32, and the fourth connection conductor 33. The first coil conductor 20, the second coil conductor 21, the third coil conductor 22, the fourth coil conductor 23, and the fifth coil conductor 24 constitute the coil 9 (see Figure 4 The coil 9 is electrically connected to the terminal electrode 5 via the connection conductor 25. The coil 9 is electrically connected to the terminal electrode 4 via the connection conductor 26.

[0061] Each coil conductor 20 to 24, each connecting conductor 25, 26, and each connecting conductor 30 to 33 includes a conductive material. The conductive material includes Ag or Pd. Each coil conductor 20 to 24, each connecting conductor 25, 26, and each connecting conductor 30 to 33 is configured as a sintered body of a conductive paste containing conductive material powder. The conductive material powder includes, for example, Ag powder or Pd powder. In the present embodiment, each coil conductor 20 to 24, each connecting conductor 25, 26, and each connecting conductor 30 to 33 includes the same conductive material as each terminal electrode 4, 5. Each coil conductor 20 to 24, each connecting conductor 25, 26, and each connecting conductor 30 to 33 may also include a conductive material different from that of each terminal electrode 4, 5.

[0062] Each coil conductor 20 to 24, each connecting conductor 25, 26, and each connecting conductor 30 to 33 is provided in a defective portion formed in the corresponding insulating layer 6. Each coil conductor 20 to 24, each connecting conductor 25, 26, and each connecting conductor 30 to 33 are formed by firing a conductive paste located in the defective portion formed in the green sheet. As described above, the green sheet and the conductive paste are fired simultaneously. Therefore, when the insulating layer 6 is obtained from the green sheet, each coil conductor 20 to 24, each connecting conductor 25, 26, and each connecting conductor 30 to 33 are obtained from the conductive paste.

[0063] The defective portion formed on the raw sheet is formed by, for example, the following process. First, a raw sheet is formed by applying a base body paste containing the constituent material of the insulating layer 6 and a photosensitive material to a substrate. The substrate is, for example, a PET film. The photosensitive material contained in the base body paste can be either a negative type or a positive type, and a known material can be used. Next, the raw sheet is exposed and developed by photolithography using a mask corresponding to the defective portion, and the defective portion is formed on the raw sheet on the substrate. The raw sheet on which the defective portion is formed is a base body pattern.

[0064] The coil conductors 20 to 24 , the connecting conductors 25 and 26 , and the connection conductors 30 to 33 are formed by, for example, the following process.

[0065] First, a conductive paste containing a photosensitive material is applied to a substrate to form a conductive material layer. The photosensitive material contained in the conductive paste can be either a negative type or a positive type, and a known material can be used. Next, a mask corresponding to the defective portion is used to expose and develop the conductive material layer by photolithography, and a conductive pattern corresponding to the shape of the defective portion is formed on the substrate.

[0066] The laminated coil component 1 is obtained by, for example, the following process following the above process. Prepare a sheet material in which the element pattern and the conductor pattern are in the same layer by combining the conductor pattern with the defective portion of the element pattern. Stack a predetermined number of prepared sheets to obtain a laminate. Firing the obtained laminate. Thus, the laminated coil component 1 can be obtained. In the laminated coil component 1, the terminal electrodes 4, 5 and the coil 9 are formed integrally.

[0067] As described above, in the laminated coil component 1 of the present embodiment, the recesses 7 and 8 are provided on the outer surface of the element body 2, and the terminal electrodes 4 and 5 have electrode portions 42 and 52 protruding from the recesses 7 and 8 in addition to the electrode portions 41 and 51 arranged in the recesses 7 and 8. Therefore, compared with the case where the terminal electrodes 4 and 5 do not have the electrode portions 42 and 52, that is, the terminal electrodes 4 and 5 are arranged in the recesses 7 and 8 as a whole, for example, when the element body 2 and the terminal electrodes 4 and 5 are fired simultaneously, the stress generated between the element body 2 and the terminal electrodes 4 and 5 due to the difference in thermal shrinkage rate is reduced. As a result, the generation of cracks is suppressed. Moreover, since the electrode portions 42 and 52 are thicker than the electrode portions 41 and 51, the generation of cracks is further suppressed. In addition, in the laminated coil component 1, for example, when it is used, the stress generated between the element body 2 and the terminal electrodes 4 and 5 due to the difference in thermal expansion rate is also reduced. As a result, the generation of cracks during use is also suppressed. Furthermore, since the terminal electrodes 4 and 5 have the electrode portions 41 and 51, the adhesion (fixing force) between the terminal electrodes 4 and 5 and the element body 2 is improved, and separation of the terminal electrodes 4 and 5 is suppressed. In the laminated coil component 1, deformation of the element body 2 is also suppressed.

[0068] The results of measuring the crack generation rate for the protrusion amount and buried amount of each terminal electrode are described. Table 1 is a table showing the relationship between the crack generation rate, the protrusion amount and buried amount of the terminal electrode. For each of the stacked coil components with a length of 0.4mm, a width of 0.2mm, and a height of 0.2mm (chip size "0402") and a stacked coil component with a length of 0.250mm, a width of 0.125mm, and a height of 0.125mm (chip size "0201"), the buried amount and protrusion amount of the terminal electrode are changed to measure the crack generation rate. The thickness of the terminal electrodes is all 20μm. The number of samples is 25.

[0069] [Table 1]

[0070] Chip size Protrusion (μm) Buried amount (μm) Crack generation rate 0402 0 20 56％ 0402 5 15 32％ 0402 8 12 16％ 0402 12 8 0％ 0402 15 5 0％ 0201 0 20 36％ 0201 5 15 24％ 0201 8 12 8％ 0201 12 8 0％ 0201 15 5 0％

[0071] Figure 5 This is a graph showing the relationship between the crack generation rate and the amount of buried terminal electrode. Figure 5 In the figure, the horizontal axis represents the buried amount of the terminal electrode, and the vertical axis represents the crack generation rate. Figure 5 As shown, in the laminated coil components of any chip size, the larger the protrusion of the terminal electrode, the lower the crack generation rate. In particular, if the protrusion of the terminal electrode exceeds the buried amount, the crack generation rate is 0%, and the crack generation is reliably suppressed.

[0072] The terminal electrodes 4 and 5 include electrode portions 41a and 51a disposed in the end surface recesses 7a and 8a and electrode portions 41b and 51b disposed in the main surface recesses 7b and 8b. In this way, since the terminal electrodes 4 and 5 are provided not only on the main surface 2c side of the element body 2 but also on the end surfaces 2a and 2b side, the terminal electrodes 4 and 5 are prevented from peeling off. That is, the terminal electrodes 4 and 5 are prevented from peeling off compared to the case where the terminal electrodes 4 and 5 include only the electrode portions 41a and 51a or only the electrode portions 41b and 51b.

[0073] The element body 2 includes a sintered body of an insulating material, and the terminal electrodes 4 and 5 include a sintered body of a conductive material. Therefore, for example, when the element body 2 and the terminal electrodes 4 and 5 are formed by simultaneous firing, cracks caused by the difference in thermal shrinkage when the insulating material becomes the element body 2 and the thermal shrinkage when the conductive material becomes the terminal electrodes 4 and 5 can be suppressed.

[0074] The laminated coil component 1 includes a plurality of (a pair in this case) terminal electrodes 4 and 5. Therefore, the occurrence of cracks due to the plurality of terminal electrodes 4 and 5 is further suppressed.

[0075] In the laminated coil component 1, the inner diameter of the coil 9 can be increased compared to the case where the terminal electrodes 4 and 5 only have the electrode parts 41 and 51 and do not have the electrode parts 42 and 52, that is, the terminal electrodes 4 and 5 are entirely buried in the recesses 7 and 8. As a result, the characteristics of the coil 9 can be improved. In addition, since the electrode parts 42 and 52 are thicker than the electrode parts 41 and 51, the inner diameter of the coil 9 can be further increased. As a result, the characteristics of the coil 9 can be further improved.

[0076] As mentioned above, although embodiment of this invention was described, this invention is not necessarily limited to the said embodiment, Various changes can be made without departing from the range which concerns on this invention.

[0077] In the above embodiment, the coil 9 is described as an example in which it includes the first coil conductor 20, the second coil conductor 21, the third coil conductor 22, the fourth coil conductor 23, the fifth coil conductor 24, the connecting conductor 25, the connecting conductor 26, the first connecting conductor 30, the second connecting conductor 31, the third connecting conductor 32, and the fourth connecting conductor 33. However, the number of conductors constituting the coil 9 is not limited to the above value.

[0078] In the above embodiment, the terminal electrode 4 has the electrode portion 4a and the electrode portion 4b. However, the terminal electrode 4 may have only the electrode portion 4a or only the electrode portion 4b. The terminal electrode 5 may have only the electrode portion 5a or only the electrode portion 5b.

[0079] In the above-mentioned embodiment, the stacked coil component 1 is described as an example of an electronic component, but the present invention is not limited to this, and can also be applied to stacked electronic components such as stacked capacitors, stacked varistors, stacked piezoelectric actuators, stacked thermistors or stacked composite components, or electronic components other than stacked electronic components.

Claims

1. An electronic component, wherein: have: a body having an outer surface provided with a recess; and A terminal electrode is arranged on the element body, The terminal electrode includes a first electrode portion disposed in the recess and a second electrode portion protruding from the recess and the outer surface. the second electrode portion is thicker than the first electrode portion, The outer surface has a main surface constituting a mounting surface and an end surface adjacent to the main surface, The recessed portion includes an end surface recessed portion provided on the end surface and a main surface recessed portion provided on the main surface. The first electrode portion includes a first end surface electrode portion disposed in the end surface recess and a first main surface electrode portion disposed in the main surface recess. The second electrode portion includes a second end surface electrode portion protruding from the end surface recess and the end surface, and a second main surface electrode portion protruding from the main surface recess and the main surface.

2. The electronic component according to claim 1, wherein The element body is in the shape of a rectangular parallelepiped, The outer surface has a first main surface constituting a mounting surface, a second main surface opposite to the first main surface, a pair of side surfaces opposite to each other, and a pair of end surfaces opposite to each other, The length of the electronic component in the relative direction of the pair of side surfaces is 1 mm or less, The length of the electronic component in the opposing direction of the pair of end surfaces is 2 mm or less.

3. The electronic component according to claim 1 or 2, wherein: The element body includes a sintered body of an insulating material, The terminal electrode includes a sintered body of a conductive material.

4. The electronic component according to any one of claims 1 to 3, wherein A plurality of the terminal electrodes are provided.

5. The electronic component according to any one of claims 1 to 4, wherein It also includes a coil disposed in the body, The terminal electrode is connected to the coil.

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