JP2006173790A - Laminated lc composite component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated LC composite component improving the reliability by suppressing occurrence of a short-circuit defect. <P>SOLUTION: A laminated body 1 includes a coil part 10 and a capacitor part 80. The coil part 10 includes coils L1, L2 respectively comprising a plurality of laminated insulators and internal conductors 21 to 27, 31 to 37 arranged in the lamination directions of the insulators. The capacitor part 80 includes a capacitor C comprising a plurality of laminated insulators and first and second capacitor electrodes 91 to 96 arranged in the lamination directions of the insulators. A side face perpendicular to the lamination directions of the insulators in the capacitor part 80 configures a sixth side face 1f perpendicular to the lamination directions of the insulators in the lamination body 1. Dummy conductors 97 are arranged between the sixth side face 1f and the second capacitor electrode 96 located at a closest position to the sixth side face 1f. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a laminated LC composite component.

As this type of laminated LC composite component, a coil part having a coil composed of a plurality of internal conductors arranged in the lamination direction of a plurality of insulators and a plurality of insulators, and a plurality of insulators And a capacitor unit having a capacitor composed of a plurality of capacitor electrodes arranged along the stacking direction of the insulator. 1). In the multilayer LC composite component described in Patent Document 1, one side surface perpendicular to the stacking direction of the insulator in the capacitor portion constitutes one side surface perpendicular to the stacking direction of the insulator in the multilayer body.
Japanese Patent Laid-Open No. 11-189111 (Japanese Patent No. 3413348)

  By the way, in the multilayer LC composite component having the above-described configuration, a multilayer body is obtained by laminating a plurality of members (for example, ceramic green sheets) that constitute an insulator, and then firing the laminate. . And the input / output terminal electrode electrode and the ground terminal electrode are formed in the side surface of the obtained laminated body. The surface of these terminal electrodes is usually subjected to electroplating in order to improve the wettability with respect to solder.

  However, when electroplating is performed, the laminate (insulating layer) near the terminal electrode is etched during plating, and a plating solution or the like may enter from the etched portion. In the multilayer LC composite component described in Patent Document 1, one side surface perpendicular to the lamination direction of the insulator in the capacitor portion constitutes one side surface perpendicular to the lamination direction of the insulator in the multilayer body. Therefore, in the multilayer LC composite component described in Patent Document 1, when a plating solution or the like enters the laminated body, the insulation resistance between the capacitor electrode and the input / output terminal electrode located closest to the one side surface is reduced. There is a possibility that a short circuit failure occurs and the reliability is significantly reduced.

  An object of the present invention is to provide a multilayer LC composite component capable of suppressing the occurrence of short-circuit defects and improving the reliability.

  The multilayer LC composite component according to the present invention includes a coil portion having a coil composed of a plurality of internal conductors that are stacked along a stacking direction of the insulator and a plurality of insulators. And a capacitor part having a capacitor composed of a plurality of capacitor electrodes arranged along the lamination direction of the insulator, and having a laminate perpendicular to the lamination direction of the insulator in the capacitor part The one side surface constitutes one side surface perpendicular to the stacking direction of the insulator in the multilayer body, and the capacitor portion has one side surface of the multilayer body and a position closest to one side surface of the plurality of capacitor electrodes. An internal conductor and a dummy conductor that is electrically insulated from the capacitor electrode are disposed between the capacitor electrode and the capacitor electrode.

  In the multilayer LC composite component according to the present invention, the dummy conductor is disposed between the one side surface of the multilayer body and the capacitor electrode that is closest to the one side surface. The distance between the capacitor electrode at the position and the dummy conductor and the distance between the dummy conductor and the one side surface of the multilayer body are relatively narrow. For this reason, when crimping a member that constitutes the insulator, a member that constitutes the insulator between the capacitor electrode and the dummy conductor located closest to the one side surface, and Sufficient pressing pressure is applied to the member that constitutes the insulator between the dummy conductor and the one side surface of the multilayer body, and from the one side surface to the capacitor electrode that is closest to the one side surface. The density of the insulator located between the two becomes higher. As a result, even when electroplating is performed, the laminated body, that is, the insulator is hardly etched, and the intrusion of the plating solution or the like that has been a cause of a decrease in insulation resistance can be suppressed. As a result, the occurrence of short-circuit defects can be suppressed.

  Further, since the dummy conductor is electrically insulated from the inner conductor and the capacitor electrode, the electrical energy applied between the one side surface of the multilayer body and the capacitor electrode located closest to the one side surface is The dummy conductor is almost halved. Therefore, it is possible to further suppress the occurrence of a short circuit failure due to a decrease in insulation resistance.

  From the above, according to the present invention, the reliability of the laminated LC composite component is improved. By the way, by narrowing the interval between the one side surface of the laminate and the capacitor electrode closest to the one side surface, the space between the one side surface and the capacitor electrode closest to the one side surface is reduced. It is conceivable to increase the density of the located insulator. However, when the density of the insulator located between the one side surface and the capacitor electrode closest to the one side surface decreases due to manufacturing variations, etc., a short circuit failure may occur due to a decrease in insulation resistance. On the contrary, the probability of occurrence increases. For this reason, it is not preferable to reduce the interval between the one side surface of the multilayer body and the capacitor electrode located closest to the one side surface.

  In addition, the laminate has a pair of side surfaces that are parallel to and opposite to each other in the stacking direction of the insulator, and an input terminal electrode that is electrically connected to the coil is formed on one side surface of the pair of side surfaces, An output terminal electrode that is electrically connected to the coil is formed on the other side surface of the pair of side surfaces, and the dummy conductor is preferably divided into a plurality in the opposing direction of the pair of side surfaces. When a dummy conductor is provided, the high-frequency component of the signal input to the input terminal electrode propagates directly to the output terminal electrode through the dummy conductor and crosstalk occurs, which may deteriorate the attenuation characteristics in the high-frequency band. is there. However, by dividing the dummy conductor into a plurality in the opposing direction of the pair of side surfaces, the occurrence of the crosstalk described above is suppressed, and the attenuation characteristics in the high frequency band can be sufficiently ensured.

  Moreover, it is preferable that the space | interval in the opposing direction of a pair of side surface between the parts divided | segmented into the plurality of dummy conductors is set to 50 micrometers or more. In this case, the occurrence of crosstalk can be more reliably suppressed.

  Moreover, it is preferable that the input terminal electrode and the output terminal electrode are formed on the side surface of the multilayer body so as to have an interval in a predetermined direction, and the dummy conductor is divided into a plurality of the predetermined direction. . When a dummy conductor is provided, the high-frequency component of the signal input to the input terminal electrode propagates directly to the output terminal electrode through the dummy conductor and crosstalk occurs, which may deteriorate the attenuation characteristics in the high-frequency band. is there. However, by dividing the dummy conductor into a plurality in the predetermined direction, the occurrence of the crosstalk described above is suppressed, and a sufficient attenuation characteristic in the high frequency band can be secured.

  Moreover, it is preferable that the space | interval in the said predetermined direction between the parts divided | segmented into plurality of dummy conductors is set to 50 micrometers or more. In this case, the occurrence of crosstalk can be more reliably suppressed.

  Further, it is preferable that the outer contour of the dummy conductor coincides with the outer contour of the capacitor electrode closest to the one side surface or is larger than the outer contour of the capacitor electrode. In this case, the area where the capacitor electrode and the dummy conductor located closest to the one side face overlap, and the area where the dummy conductor and the one side where the pressing pressure directly acts overlaps, and the sufficient pressing pressure is increased. The area to be applied is expanded, and the area of the insulator having a higher density is increased. As a result, the region where the insulator is etched is reduced, and the occurrence of short-circuit failure can be more reliably suppressed due to the decrease in insulation resistance.

  According to the present invention, it is possible to provide a multilayer LC composite component capable of suppressing the occurrence of a short circuit failure and improving the reliability.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a multilayer LC composite component according to the invention will be described in detail with reference to the accompanying drawings. In the description, the same reference numerals are used for the same elements or elements having the same function, and redundant description is omitted. In the description, the terms “upper” and “lower” may be used, which correspond to the vertical direction of each figure.

  With reference to FIGS. 1-4, the structure of the multilayer LC composite component F which concerns on this embodiment is demonstrated. FIG. 1 is a perspective view showing a multilayer LC composite component according to this embodiment. FIG. 2 is a view for explaining a cross-sectional configuration of the multilayer LC composite component according to the present embodiment. FIG. 3 is an exploded perspective view of a multilayer body included in the multilayer LC composite component according to the present embodiment. FIG. 4 is a view for explaining an equivalent circuit of the multilayer LC composite component according to the present embodiment.

  As shown in FIG. 1, the multilayer LC composite component F includes a multilayer body 1, a pair of input / output terminal electrodes 3, 5, and a ground terminal electrode 7. One of the pair of input / output terminal electrodes 3 and 5 functions as an input terminal electrode, and the other functions as an output terminal electrode.

  The laminated body 1 has a substantially rectangular parallelepiped shape, and has side surfaces 1a to 1f of first to sixth side surfaces. The first side surface 1a and the second side surface 1b are positioned so as to face each other when viewed in the X-axis direction. The third side surface 1c and the fourth side surface 1d are positioned so as to face each other when viewed in the Y-axis direction. The fifth side face 1e and the sixth side face 1f are positioned so as to face each other when viewed in the Z-axis direction.

  The input / output terminal electrode 3 is formed so as to cover the entire surface of the first side surface 1a, and a part thereof wraps around the side surfaces 1c to 1f. The input / output terminal electrode 5 is formed so as to cover the entire surface of the second side surface 1b, and further, a part thereof wraps around each of the side surfaces 1c to 1f. Each ground terminal electrode 7 is formed in a strip shape in the stacking direction of the stacked body 1, and both end portions thereof are formed so as to go around the fifth side face 1 e and the sixth side face 1 f. The input / output terminal electrode 3 and the input / output terminal electrode 5 are spaced apart from each other in a predetermined direction (in the present embodiment, the X-axis direction, that is, the opposing direction of the first side surface 1a and the second side surface 1b). Will be formed.

  As shown in FIGS. 2 and 3, the multilayer body 1 includes a coil portion 10 including a plurality (two in this embodiment) of coils L <b> 1 and L <b> 2, a connection portion 50, and a capacitor including a capacitor C. Part 80 is provided. The laminated body 1 is configured by laminating the coil part 10, the connection part 50, and the capacitor part 80. The connection unit 50 is located between the coil unit 10 and the capacitor unit 80.

  First, the configuration of the coil unit 10 will be described. A plurality of (in this embodiment, eight layers) insulators 11 to 18 are stacked and a plurality of internal conductors 21 to 27, 31 arranged along the stacking direction of the plurality of insulators 11 to 18. Coil L1 and L2 comprised by -37. The actual laminated LC composite component F is integrated to such an extent that the boundary between the insulators 11 to 18 cannot be visually recognized. The insulators 11 to 18 are configured by firing a magnetic green sheet.

  The inner conductors 21 and 31 are positioned on the insulator 11 and are arranged in the opposing direction of the first side face 1a and the second side face 1b with a predetermined distance from each other. The inner conductors 21 and 31 are electrically insulated from each other. The internal conductor 21 includes a lead-out portion 21 a that is located at one end of the internal conductor 21 and is exposed on the side surface of the insulator 11. The lead-out portion 21a is located at one end of the coil L1. The lead-out portion 21 a of the internal conductor 21, that is, one end portion of the coil L 1 is electrically connected to the input / output terminal electrode 3.

  The internal conductor 31 includes a lead-out portion 31 a that is located at one end of the internal conductor 31 and is exposed on the side surface of the insulator 11. The derivation | leading-out part 31a will be located in one edge part of the coil L2. The lead-out portion 31 a of the internal conductor 31, that is, one end portion of the coil L 2 is electrically connected to the input / output terminal electrode 5. At positions corresponding to the other ends of the internal conductors 21 and 31 in the insulator 11, through-hole electrodes 41a and 41b penetrating the insulator 11 in the thickness direction are formed. Each through-hole electrode 41a, 41b is electrically connected to the other end of the corresponding internal conductor 21, 31. The inner conductors 21 and 31 function as lead conductors.

  The inner conductors 22 and 32 are located on the insulator 12 and are arranged in the opposing direction of the first side surface 1a and the second side surface 1b with a predetermined distance from each other. The inner conductors 22 and 32 are electrically insulated from each other. The inner conductors 22 and 32 correspond to approximately 3/4 turns of the coils L1 and L2, and extend substantially U-shaped on the insulator 12. The inner conductors 22 and 32 include regions that are electrically connected to the through-hole electrodes 41a and 41b, respectively, in a state where the insulators 11 and 12 are laminated on one end of the inner conductors 22 and 32. Through-hole electrodes 42a and 42b penetrating the insulator 12 in the thickness direction are formed at positions corresponding to the other ends of the internal conductors 22 and 32 in the insulator 12, respectively. Each through-hole electrode 42a, 42b is electrically connected to the other end of the corresponding internal conductor 22, 32.

  The inner conductors 23 and 33 are positioned on the insulator 13 and are arranged in the opposing direction of the first side surface 1a and the second side surface 1b with a predetermined distance from each other. The inner conductors 23 and 33 are electrically insulated from each other. The inner conductors 23 and 33 correspond to approximately 3/4 turns of the coils L1 and L2, and extend in a substantially C shape on the insulator 13. The internal conductors 23 and 33 include regions electrically connected to the through-hole electrodes 42a and 42b in a state where the insulators 12 and 13 are laminated on one end of the internal conductors 23 and 33, respectively. Through-hole electrodes 43a and 43b penetrating the insulator 13 in the thickness direction are formed at positions corresponding to the other ends of the internal conductors 23 and 33 in the insulator 13, respectively. Each through-hole electrode 43a, 43b is electrically connected to the other end of the corresponding internal conductor 23, 33.

  The inner conductors 24 and 34 are located on the insulator 14 and are arranged in the opposing direction of the first side face 1a and the second side face 1b with a predetermined distance from each other. The inner conductors 24 and 34 are electrically insulated from each other. The inner conductors 24 and 34 correspond to approximately 3/4 turns of the coils L1 and L2, and extend substantially U-shaped on the insulator 14. The inner conductors 24 and 34 include regions that are electrically connected to the through-hole electrodes 43a and 43b, respectively, in a state where the insulators 13 and 14 are laminated on one end of the inner conductors 24 and 34. Through-hole electrodes 44a and 44b penetrating the insulator 14 in the thickness direction are formed at positions corresponding to the other ends of the internal conductors 24 and 34 in the insulator 14, respectively. Each through-hole electrode 44a, 44b is electrically connected to the other end of the corresponding internal conductor 24, 34.

  The inner conductors 25 and 35 are located on the insulator 15 and are arranged in the opposing direction of the first side surface 1a and the second side surface 1b with a predetermined distance from each other. The inner conductors 25 and 35 are electrically insulated from each other. The inner conductors 25 and 35 correspond to approximately 3/4 turns of the coils L1 and L2, and extend in a substantially C shape on the insulator 15. The inner conductors 25 and 35 include regions that are electrically connected to the through-hole electrodes 44a and 44b, respectively, in a state where the insulators 14 and 15 are laminated on one end of the inner conductors 25 and 35. At positions corresponding to the other ends of the internal conductors 25 and 35 in the insulator 15, through-hole electrodes 45 a and 45 b penetrating the insulator 15 in the thickness direction are formed. Each through-hole electrode 45a, 45b is electrically connected to the other end of the corresponding internal conductor 25, 35.

  The inner conductors 26 and 36 are located on the insulator 16 and are arranged in the opposing direction of the first side surface 1a and the second side surface 1b with a predetermined distance from each other. The inner conductors 26 and 36 are electrically insulated from each other. The inner conductors 26 and 36 correspond to approximately 3/4 turns of the coils L1 and L2, and extend substantially U-shaped on the insulator 16. The inner conductors 26 and 36 include regions that are electrically connected to the through-hole electrodes 45a and 45b, respectively, in a state where the insulators 15 and 16 are laminated on one end of the inner conductors 26 and 36. Through-hole electrodes 46a and 46b penetrating the insulator 16 in the thickness direction are formed at positions corresponding to the other ends of the internal conductors 26 and 36 in the insulator 16, respectively. Each through-hole electrode 46a, 46b is electrically connected to the other end of the corresponding internal conductor 26, 36.

  The internal conductors 27 and 37 are located on the insulator 17 and are arranged in the opposing direction of the first side surface 1a and the second side surface 1b with a predetermined distance from each other. The inner conductors 27 and 37 are electrically insulated from each other. The inner conductors 27 and 37 correspond to approximately one turn of the coils L1 and L2, and are wound on the insulator 17 in a spiral shape. The internal conductors 27 and 37 include regions electrically connected to the through-hole electrodes 46a and 46b, respectively, in a state where the insulators 16 and 17 are laminated on one end of the internal conductors 27 and 37. Through-hole electrodes 47a and 47b penetrating the insulator 17 in the thickness direction are formed at positions corresponding to the other ends of the internal conductors 27 and 37 in the insulator 17, respectively. Each through-hole electrode 47a, 47b is electrically connected to the other end of the corresponding internal conductor 27, 37.

  The inner conductors 21 to 27 are electrically connected to each other to constitute the coil L1. The inner conductors 31 to 37 are electrically connected to each other to constitute the coil L2. The insulator 18 is located on the insulator 11 and functions as a base layer for protecting the internal conductors 21 and 31. The insulator 18 is also for adjusting the laminated body 1 to a predetermined thickness dimension, and the number of the insulators 18 is not limited to one layer.

  Next, the configuration of the connection unit 50 will be described. The connection unit 50 includes a plurality of (in this embodiment, four layers) insulators 51 to 54. The connection part 50 is configured by laminating insulators 51 to 54. The actual laminated LC composite component F is integrated to such an extent that the boundaries between the insulator 17 and the insulator 51 and between the insulators 51 to 54 are not visible. The insulators 51 to 53 are configured by firing a magnetic green sheet, and the insulator 54 is configured by firing a non-magnetic green sheet.

  On the insulator 51, land-like inner conductors 61a and 61b are located. Through-hole electrodes 71a and 71b penetrating the insulator 51 in the thickness direction are formed at positions corresponding to the internal conductors 61a and 61b in the insulator 51, respectively. Each through-hole electrode 71a, 71b is electrically connected to the corresponding internal conductor 61a, 61b. The internal conductors 61a and 61b are electrically connected to the through-hole electrodes 47a and 47b in a state where the insulators 17 and 51 are laminated. The internal conductors 61a and 61b function as through-hole connection conductors.

  An internal conductor 62 is located on the insulator 52. The inner conductor 62 extends in the alignment direction of the coils L1 and L2 (opposite direction between the first side surface 1a and the second side surface 1b). Through-hole electrodes 72a and 72b penetrating the insulator 52 in the thickness direction are formed at positions corresponding to both ends of the inner conductor 62 in the insulator 52, respectively. Each through-hole electrode 72a, 72b is electrically connected to the end of the internal conductor 62. The internal conductor 62 is electrically connected to the through-hole electrodes 71a and 71b in a state where the insulators 51 and 52 are laminated. The inner conductor 62 functions as a through-hole connection conductor.

  On the insulator 53, land-like inner conductors 63a and 63b are located. Through hole electrodes 73a and 73b penetrating the insulator 53 in the thickness direction are formed at positions corresponding to the internal conductors 63a and 63b in the insulator 53, respectively. Each through-hole electrode 73a, 73b is electrically connected to the corresponding internal conductor 63a, 63b. The internal conductors 63a and 63b are electrically connected to the through-hole electrodes 72a and 72b, respectively, in a state where the insulators 52 and 53 are laminated. The internal conductors 63a and 63b function as through-hole connection conductors.

  On the insulator 54, land-like inner conductors 64a and 64b are located. Through-hole electrodes 74a and 74b penetrating the insulator 54 in the thickness direction are formed at positions corresponding to the internal conductors 64a and 64b in the insulator 54, respectively. Each through-hole electrode 74a, 74b is electrically connected to the corresponding internal conductor 64a, 64b. The internal conductors 64a and 64b are electrically connected to the through-hole electrodes 73a and 73b, respectively, in a state where the insulators 53 and 54 are laminated. The internal conductors 64a and 64b function as through-hole connection conductors.

  The through-hole electrodes 71a to 74a and 71b to 74b are arranged substantially linearly in the stacking direction of the insulators 51 to 54 by being stacked with the insulators 51 to 54, and are electrically connected to each other. Configure the energization path. Further, the energization path constituted by the through-hole electrodes 71 a to 74 a and the energization path constituted by the through-hole electrodes 71 b to 74 b are electrically connected to each other by the internal conductor 62.

  Next, the configuration of the capacitor unit 80 will be described. The capacitor section 80 includes a plurality of first capacitor electrodes 91, in which a plurality of (in this embodiment, eight layers) insulators 81 to 88 are stacked and arranged in the stacking direction of the insulators 81 to 88. 93 and 95 and a capacitor C composed of a plurality of capacitor electrodes 92, 94 and 96. In the present embodiment, the first capacitor electrodes 91, 93, 95 are signal electrodes (so-called hot electrodes), and the second capacitor electrodes 92, 94, 96 are ground electrodes (so-called ground electrodes). ). The actual laminated LC composite component F is integrated to such an extent that the boundaries between the insulator 54 and the insulator 81 and the boundaries between the insulators 81 to 88 are not visible. The insulators 81 to 88 are configured by firing a dielectric green sheet.

  A first capacitor electrode 91 is located on the insulator 81. One through-hole electrode 111 that penetrates the insulator 81 in the thickness direction is formed at the center of the insulator 81. The through-hole electrode 111 is electrically connected to the first capacitor electrode 91. The first capacitor electrode 91 is electrically connected to the through-hole electrodes 74a and 74b in a state where the insulators 54 and 81 are laminated.

  A second capacitor electrode 92 corresponding to the first capacitor electrodes 91 and 93 is located on the insulator 82. An opening is formed in the center of the second capacitor electrode 92 so that the insulator 82 is exposed. Second capacitor electrode 92 includes lead-out portions 92a and 92b exposed on opposite sides of insulator 82. The second capacitor electrode 92 is electrically connected to the ground terminal electrode 7 through the lead-out portions 92a and 92b.

  On the insulator 82, the land-like inner conductor 101 is located in a region corresponding to the opening formed in the second capacitor electrode 92. A through-hole electrode 112 that penetrates the insulator 82 in the thickness direction is formed at a position corresponding to the inner conductor 101 in the insulator 82. The through-hole electrode 112 is electrically connected to the inner conductor 101. The inner conductor 101 is electrically connected to the through-hole electrode 111 in a state where the insulators 81 and 82 are laminated. The internal conductor 101 functions as a through-hole connection conductor.

  A first capacitor electrode 93 is formed on the insulator 83. A through-hole electrode 113 that penetrates the insulator 83 in the thickness direction is formed at the center of the insulator 83. The through hole electrode 113 is electrically connected to the first capacitor electrode 93. The first capacitor electrode 93 is electrically connected to the through-hole electrode 112 in a state where the insulators 82 and 83 are laminated.

  A second capacitor electrode 94 corresponding to the first capacitor electrodes 93 and 95 is located on the insulator 84. An opening is formed in the center of the second capacitor electrode 94 so that the insulator 84 is exposed. The second capacitor electrode 94 includes lead-out portions 94a and 94b exposed on opposite side surfaces of the insulator 84. The second capacitor electrode 94 is electrically connected to the ground terminal electrode 7 through the lead-out portions 94a and 94b.

  On the insulator 84, the land-shaped inner conductor 102 is located in a region corresponding to the opening formed in the second capacitor electrode 94. A through-hole electrode 114 that penetrates the insulator 84 in the thickness direction is formed at a position corresponding to the inner conductor 102 in the insulator 84. The through hole electrode 114 is electrically connected to the inner conductor 102. The inner conductor 102 is electrically connected to the through-hole electrode 113 in a state where the insulators 83 and 84 are laminated. The inner conductor 102 functions as a through-hole connection conductor.

  A first capacitor electrode 95 is formed on the insulator 85. The first capacitor electrode 95 is electrically connected to the through-hole electrode 114 in a state where the insulators 84 and 85 are laminated.

  A second capacitor electrode 96 corresponding to the first capacitor electrode 95 is located on the insulator 86. An opening is formed in the center of the second capacitor electrode 96 so that the insulator 86 is exposed. Second capacitor electrode 96 includes lead-out portions 96 a and 96 b that are exposed at opposite sides of insulator 86. The second capacitor electrode 96 is electrically connected to the ground terminal electrode 7 through the lead-out portions 96a and 96b. Note that the opening is not necessarily formed.

  The through-hole electrodes 111 to 114 are arranged in a substantially straight line in the stacking direction of the insulators 81 to 85 by laminating the insulators 81 to 85, and constitute an energization path by being electrically connected to each other. To do.

  A dummy conductor 97 is located on the insulator 87. The dummy conductor 97 is divided into a plurality of (in this embodiment, two) portions 97a and 97b in the opposing direction (X-axis direction) between the first side surface 1a and the second side surface 1b. The divided portions 97a and 97b of the dummy conductor 97 have a rectangular shape and are formed in a planar shape. Incidentally, one side surface perpendicular to the stacking direction (Z-axis direction) of the insulators 81 to 86 in the capacitor unit 80 is the stacking direction (Z-axis direction) of the insulators 11 to 18, 51 to 54, 81 to 86 in the stack 1. The sixth side surface 1f perpendicular to the upper side is formed. Therefore, the dummy conductor 97 is disposed between the sixth side surface 1f and the second capacitor electrode 96 located closest to the sixth side surface 1f.

  The dummy conductor 97 has a predetermined interval from the side surface of the insulator 87 so as not to be exposed on the side surface of the insulator 87, and the inner conductors 21 to 27 and 31 to 37 and the first capacitor electrodes 91, 93 and 95 are disposed. In addition, the capacitor electrodes 92, 94, and 96 are electrically insulated. As shown in FIG. 5, the outer contour of the dummy conductor 97 is larger than the outer contour of the second capacitor electrode 96 located closest to the sixth side surface 1f. Note that the outer contour of the dummy conductor 97 may match the outer contour of the second capacitor electrode 96, as shown in FIG. Here, the outer contour of the dummy conductor 97 is an outer contour when the dummy conductor 97 is not divided. Further, the outer contour of the second capacitor electrode 96 is an outer contour of a portion of the second capacitor electrode 96 excluding the lead portions 96a and 96b.

  The dummy conductor 97 is made of the same material as the inner conductors 21 to 27, 31 to 37 and the capacitor electrodes 91 to 96, and in the present embodiment, is mainly composed of silver. An interval S between the divided portions 97a and 97b of the dummy conductor 97 in the facing direction between the first side surface 1a and the second side surface 1b is set to 50 μm or more. In the present embodiment, the interval S is set to 200 μm.

  An insulator 88 is located below the insulator 87. The insulator 88 is for adjusting the laminated body 1 to a predetermined thickness, and the number of the insulators 88 is not limited to one layer.

  In the multilayer LC composite component F having the above-described configuration, as shown in FIG. 4, each coil L1, L2 and a capacitor C corresponding to each coil L1, L2 constitute a T-type filter. The laminated LC composite component F is designed such that the passband is 1 to 100 MHz, for example.

  Next, a manufacturing method of the multilayer LC composite component F will be described.

  First, the magnetic green sheets that constitute the insulators 11 to 18 and 51 to 53, the nonmagnetic green sheet that constitutes the insulator 54, and the insulators 81 to 88 are constituted. Prepare a dielectric green sheet. Next, the magnetic green sheets that constitute the insulators 11 to 17 and 51 to 53, the non-magnetic green sheets that constitute the insulator 54, and the insulators 81 to 85 will be constituted. Through holes are formed by laser processing or the like at predetermined positions of each dielectric green sheet, that is, through positions where through-hole electrodes 41a to 47a, 41b to 47b, 71a to 74a, 71b to 74b, and 111 to 114 are formed.

  Next, conductor patterns corresponding to the internal conductors 21 to 27 and 31 to 37 are formed on the magnetic green sheets that constitute the insulators 11 to 17. In addition, conductor patterns corresponding to the internal conductors 61a, 61b, 62, 63a, and 63b are formed on the magnetic green sheets that constitute the insulators 51 to 53. In addition, a conductor pattern corresponding to each of the internal conductors 64a and 64b is formed on each non-magnetic green sheet constituting the insulator 54. In addition, conductor patterns corresponding to the capacitor electrodes 91 to 96 are formed on the dielectric green sheets that constitute the insulators 81 to 86. In addition, a conductor pattern corresponding to each dummy conductor 97 is formed on the dielectric green sheet that constitutes the insulator 87. Each conductor pattern is formed, for example, by screen-printing a conductor paste (conductor material) mainly composed of silver or nickel and then drying. Each through hole is filled with a conductor paste when each conductor pattern is formed.

The magnetic green sheet is a slurry made of, for example, ferrite (eg, Ni—Cu—Zn ferrite, Ni—Cu—Zn—Mg ferrite, Cu—Zn ferrite, or Ni—Cu ferrite) powder as a raw material. Can be used which is formed by coating the film by a doctor blade method. The thickness of the magnetic green sheet is, for example, about 20 μm. As the non-magnetic green sheet, for example, a slurry obtained by applying a slurry using Zn-based non-magnetic ferrite powder as a raw material on a film by a doctor blade method can be used. The thickness of the nonmagnetic green sheet is, for example, about 20 μm. As the dielectric green sheet, for example, a slurry obtained by applying a slurry using a mixed powder of TiO ₂ , CuO and NiO as a raw material on a film by a doctor blade method can be used. The thickness of the dielectric green sheet is, for example, about 40 μm.

  Next, the green sheets are sequentially laminated and pressure-bonded, cut into chips, and then fired at a predetermined temperature (for example, 800 to 900 degrees). Thereby, the laminated body 1 will be formed. For example, the laminate 1 has a longitudinal length of 2.0 mm, a width of 1.2 mm, and a height of 0.8 mm after firing.

  Next, the input / output terminal electrodes 3 and 5 and the ground terminal electrode 7 are formed on the laminate 1. Thereby, the laminated LC composite component F is formed. The input / output terminal electrodes 3 and 5 and the ground terminal electrode 7 are transferred to a predetermined temperature (for example, 700 ° C.) after transferring an electrode paste mainly composed of silver, nickel, or copper to the outer surface of the laminate 1 obtained as described above. Degree) and then electroplating. For electroplating, Cu and Ni and Sn, Ni and Sn, Ni and Au, Ni and Pd and Au, Ni and Pd and Ag, Ni and Ag, or the like can be used.

  It should be noted that the non-magnetic green sheet that forms the insulator 54 is heated between the magnetic green sheet that forms the insulator 53 and the dielectric green sheet that forms the insulator 81. A green sheet having a shrinkage rate is preferable.

  In the present embodiment, since the dummy conductor 97 is disposed between the sixth side surface 1f and the second capacitor electrode 96, the distance between the second capacitor electrode 96 and the dummy conductor 97, and the dummy conductor The distance between 97 and the sixth side surface 1f is relatively narrow. For this reason, when the green sheet which will comprise the insulators 11-18, 51-54, 81-85 is crimped | bonded, the insulator 86 between the 2nd capacitor electrode 96 and the dummy conductor 97 is comprised. A sufficient pressing pressure is applied to the green sheet to be formed and the green sheets to form the insulators 87 and 88 between the dummy conductor 97 and the sixth side face 1f, so that the sixth side face The density of the insulators 86 to 88 located between 1f and the second capacitor electrode 96 is increased. As a result, even when electroplating is performed, the laminate 1, that is, the insulators 86 to 88 are hardly etched, and the intrusion of a plating solution or the like that has caused a decrease in insulation resistance can be suppressed. As a result, the occurrence of short-circuit defects can be suppressed.

  In the present embodiment, since the dummy conductor 97 is electrically insulated from the inner conductors 21 to 27 and 31 to 37 and the capacitor electrodes 91 to 96, the sixth side surface 1 f of the multilayer body 1 and the second capacitor electrode 96 are used. The electrical energy applied between the first and second electrodes is almost halved by the dummy conductor 97. Therefore, it is possible to further suppress the occurrence of a short circuit failure due to a decrease in insulation resistance.

  From the above, according to the present embodiment, the reliability of the multilayer LC composite component F is improved. By the way, the insulators 86 to 88 located between the sixth side surface 1f and the second capacitor electrode 96 are reduced by narrowing the distance between the sixth side surface 1f of the multilayer body 1 and the second capacitor electrode 96. It is conceivable to increase the density. However, when the density of the insulators 86 to 88 located between the sixth side surface 1f and the second capacitor electrode 96 is reduced due to manufacturing variations or the like, a short circuit failure occurs due to a decrease in insulation resistance. On the contrary, the probability of doing becomes high. For this reason, it is not preferable to reduce the distance between the sixth side surface 1f of the multilayer body 1 and the second capacitor electrode 96.

  Japanese Patent Application Laid-Open No. 2002-1000094 discloses a laminated LC noise filter having a floating electrode pattern. However, the floating electrode pattern in Japanese Patent Application Laid-Open No. 2002-1000094 is disposed between the coil conductor pattern of the inductor portion and the capacitor electrode pattern of the capacitor portion. Is not disposed between the side surface 1f of the second capacitor electrode 96 and the second capacitor electrode 96 located closest to the sixth side surface 1f. Therefore, in the multilayer LC noise filter disclosed in Japanese Patent Application Laid-Open No. 2002-1000094, a short circuit defect may occur as in the above-described Patent Document 1, and the reliability may be significantly reduced.

  In the present embodiment, the dummy conductor 97 is made of the same conductor material as the inner conductors 21 to 27, 31 to 37 and the capacitor electrodes 91 to 96, and the inner conductors 21 to 27, 31 to 37 and the capacitor electrodes 91 to 96. It is formed by the same method. Therefore, when manufacturing the multilayer LC composite component F, it is only necessary to add some process changes such as adding a process for forming the dummy conductor 97 to the conventional method of manufacturing the multilayer LC composite component. As a result, an increase in cost and design load is suppressed, and mass productivity is excellent.

  Moreover, in this embodiment, the laminated body 1 has a pair of 1st and 2nd side surfaces 1a and 1b which are parallel to the lamination direction of the insulators 11-18, 51-54, 81-88, and mutually oppose. The input / output terminal electrode 3 electrically connected to the coil L1 is formed on the first side face 1a, and the input / output terminal electrode 5 electrically connected to the coil L2 is formed on the second side face 1b. The dummy conductor 97 is formed and divided into a plurality of pieces in the opposing direction of the first side face 1a and the second side face 1b. When the dummy conductor 97 is provided, a high frequency component of the signal input to the input / output terminal electrode 3 propagates directly to the input / output terminal electrode 5 through the dummy conductor 97 to generate crosstalk, and attenuation characteristics in a high frequency band. There is a fear of getting worse. However, by dividing the dummy conductor 97 into a plurality in the opposing direction of the first side face 1a and the second side face 1b, the occurrence of the above-described crosstalk is suppressed, and the attenuation characteristic in the high frequency band is reduced. It can be secured sufficiently.

  In the present embodiment, the outer contour of the dummy conductor 97 matches the outer contour of the second capacitor electrode 96 or is larger than the outer contour of the second capacitor electrode 96. As a result, the area where the second capacitor electrode 96 and the dummy conductor 97 overlap, and the area where the dummy conductor 97 and the sixth side surface 1f where the pressing pressure directly acts when crimping are increased, and a sufficient pressing pressure is obtained. The area to be applied is expanded, and the areas of the insulators 86 to 88 in which the density is increased are increased. As a result, the region where the insulators 86 to 88 are etched is reduced, and the occurrence of short-circuit failure can be more reliably suppressed due to the decrease in insulation resistance.

  In general, the crosstalk between a pair of conductor patterns formed on a nonmagnetic material is determined by the distance between the pair of conductor patterns, and is preferably set to −30 dB or less. Therefore, the crosstalk at 100 MHz in the multilayer LC composite component F having the above-described configuration was measured. The crosstalk at 100 MHz in the multilayer LC composite component F was −42 dB. Therefore, the high-frequency component in the signal input to the input / output terminal electrode 3 directly propagates to the input / output terminal electrode 5 through the dummy conductor 97 without passing through the filter constituted by the coils L1 and L2 and the capacitor C. The phenomenon hardly occurs, and the deterioration of the attenuation characteristic in the high frequency band in the filter is suppressed. The reason for measuring the crosstalk at 100 MHz is that the crosstalk at 100 MHz becomes the maximum among 1 to 100 MHz which is the pass band of the multilayer LC composite component F.

  Subsequently, the crosstalk at 100 MHz was measured by changing the distance S in the facing direction between the first side surface 1a and the second side surface 1b between the divided portions 97a and 97b of the dummy conductor 97. . When the interval S was set to 50 μm, the crosstalk was −30 dB. When the interval S was set to 100 μm, the crosstalk was −35 dB. When the interval S was set to 150 μm, the crosstalk was −39 dB. When the interval S was set to 250 μm, the crosstalk was −44 dB.

  As can be seen from the above measurement results, by setting the distance S in the facing direction between the first side surface 1a and the second side surface 1b between the divided portions 97a and 97b of the dummy conductor 97 to 50 μm or more. The occurrence of crosstalk can be more reliably suppressed. When the distance S is 50 μm, if the dummy conductor 97 is formed by printing, the divided portions 97a and 97b may be connected due to bleeding or the like. For this reason, it is preferable that the space | interval S is set to 100 micrometers or more.

  Crosstalk was measured as follows. A part of the input / output terminal 5 to which the lead-out portion 31a of the multilayer LC composite component F is connected is electrically insulated between the internal circuit and the input / output terminal 5, and then mounted on the measurement board. A signal was input to the output terminal 3 and a signal output to the input / output terminal 5 was measured.

  Next, it will be specifically shown by Examples 1 and 2 and Comparative Example 1 that the present embodiment can improve the reliability by suppressing the occurrence of short-circuit defects.

  In Example 1, a multilayer LC composite component having the same configuration as that of the multilayer LC composite component F of the above-described embodiment was used. The outer contour of the dummy conductor 97 was made larger by 50 μm than the outer contour of the second capacitor electrode 96. The distance between the dummy conductor 97 and the input / output terminal electrodes 3 and 5 was 50 μm. The distance S in the facing direction between the first side surface 1a and the second side surface 1b between the divided portions 97a and 97b of the dummy conductor 97 is set to 200 μm as described above.

  The multilayer LC composite component according to Example 1 was manufactured, and the presence or absence of etching of the insulator was observed by DPA (Destructive Physical Analysis) of the manufactured multilayer LC composite component. The number of specimens was 10. As a result of observation, almost no etching of the insulator occurred.

  In Example 2, a multilayer LC composite component in which the outer contour of the dummy conductor 97 was matched with the outer contour of the second capacitor electrode 96 was used. The multilayer LC composite component according to Example 2 has the same configuration as the multilayer LC composite component F described above except for the relationship between the outer contour of the dummy conductor 97 and the outer contour of the second capacitor electrode 96. . The distance S in the facing direction between the first side surface 1a and the second side surface 1b between the divided portions 97a and 97b of the dummy conductor 97 is set to 200 μm as described above.

  The multilayer LC composite component according to Example 2 was manufactured, and the presence or absence of etching of the insulator was observed with the DPA of the manufactured multilayer LC composite component. The number of specimens was 10. As a result of observation, almost no etching of the insulator occurred as in the multilayer LC composite component according to Example 1.

  In Comparative Example 1, a laminated LC composite component having a configuration not including the dummy conductor 97 was used. The laminated LC composite component according to Comparative Example 1 has the same configuration as the above-described laminated LC composite component F except that the dummy conductor 97 is not included.

  The multilayer LC composite component according to Comparative Example 1 was manufactured, and the presence or absence of etching of the insulator was observed with the DPA of the manufactured multilayer LC composite component. The number of specimens was 10. As a result of observation, etching occurred partially in the vicinity of the side surface of the laminate.

Subsequently, in order to confirm the reliability of Examples 1 and 2 and Comparative Example 1, a moisture resistance load life test was performed. The moisture resistance load life test was performed according to the following procedure. In a constant temperature bath (room temperature: 85 ° C., humidity: 85%), DC 10 V is continuously applied between one input / output terminal electrode and the ground terminal electrode of the laminated LC composite component, and the laminated LC composite is provided every predetermined time. Remove the parts from the thermostat and measure the insulation resistance. A change (deterioration) in the insulation resistance over time is observed, and a case where the insulation resistance becomes 10 ⁶ Ω or less is determined as defective. The number of specimens was 30 in each example.

  The results of the moisture resistance load life test are shown in FIG. FIG. 7 is a chart summarizing the number of specimens judged defective after each elapsed time. The denominator in each numerical value is the number of specimens (30), and the numerator in each numerical value is the number of specimens judged defective. is there. A common requirement for a moisture resistant load life test is a guarantee of 1000 hours. In Examples 1 and 2, there is no specimen determined to be defective after 1000 hours. In contrast, in Comparative Example 1, two specimens were determined to be defective after 1000 hours. From the above, the effectiveness of the present embodiment was confirmed.

  In Example 2, two samples were determined to be defective after 2000 hours. On the other hand, in Example 1, there is no specimen determined to be defective even after 2000 hours. This is because the outer contour of the dummy conductor is made larger than the outer contour of the capacitor electrode adjacent to the dummy conductor in the stacking direction, so that an area where a sufficient pressing pressure is applied is expanded and the density is increased. This is considered to be an effect of the increase in the area of.

  Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments and modifications. For example, the dummy conductor 97 is not limited to the shape, the number of divisions, and the material of the dummy conductor 97 described above. Further, the dummy conductor 97 may be divided in the opposing direction of the third side face 1c and the fourth side face 1d. Even when the dummy conductor 97 is divided in the opposing direction of the third side face 1c and the fourth side face 1d, the dummy conductor 97 is connected to the first side face 1a and the first side face in order to suppress the occurrence of crosstalk. 2 is preferably further divided in the direction facing the side surface 1b.

  Further, the inductances of the coils L1 and L2 in the multilayer LC composite component F can be adjusted by the width and the number of layers of the internal conductors 21 to 27 and 31 to 37, and are not limited to the above-described embodiment. Further, the capacitance of the capacitor C in the multilayer LC composite component F can be adjusted by the area and the number of layers of the capacitor electrodes 91 to 96, and is not limited to the above-described embodiment.

  Moreover, in this embodiment, although the laminated body 1 is comprised by laminating | stacking a green sheet (green sheet lamination | stacking construction method), it is not restricted to this, A slurry (For example, a nonmagnetic substance slurry and a magnetic substance slurry) Etc.) and the slurry, the inner conductors 21 to 27, 31 to 37, the capacitor electrodes 91 to 96, and the like may be printed and laminated (print lamination method) to constitute the laminate 1.

  In the present embodiment, the input / output terminal electrodes 3 and 5 may be formed on the third side surface 1c or the fourth side surface 1d in the same manner as the ground terminal electrode 7. In this case, the input / output terminal electrodes 3 and 5 are formed with a gap in the opposing direction of the first side surface 1a and the second side surface 1b so as to sandwich the ground terminal electrode 7 therebetween. Even when the input / output terminal electrodes 3 and 5 are formed on the third side surface 1c or the fourth side surface 1d, the dummy conductor 97 may be divided in the facing direction of the first side surface 1a and the second side surface 1b. .

  In the present embodiment, the present invention is applied to the laminated LC composite component constituting the T-type filter. However, the present invention is not limited to this, and the present invention is not limited to this. The present invention may be applied to a laminated LC composite component that constitutes. Further, the present invention may be applied to an array type stacked LC composite component.

It is a perspective view which shows the lamination type LC composite component which concerns on this embodiment. It is a figure for demonstrating the cross-sectional structure of the multilayer LC composite component which concerns on this embodiment. It is a disassembled perspective view of the laminated body contained in the multilayer LC composite component which concerns on this embodiment. It is a figure for demonstrating the equivalent circuit of the laminated | stacked LC composite component which concerns on this embodiment. It is a top view which shows a dummy conductor. It is a top view which shows a dummy conductor. It is a graph which shows the result of a moisture-proof load life test.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Laminated body, 1a-1f ... 1st-6th side surface, 3,5 ... Input / output terminal electrode, 7 ... Ground terminal electrode, 10 ... Coil part, 11-18 ... Insulator, 21-27, 31- 37... Internal conductors, 41a to 47a, 41b to 47b... Through-hole electrodes, 50... Connections, 51 to 54. Insulators, 61a, 61b, 62, 63a, 63b, 64a and 64b. 71b-74b ... through-hole electrode, 80 ... capacitor part, 81-88 ... insulator, 91,93,95 ... first capacitor electrode, 92,94,96 ... second capacitor electrode, 97 ... dummy conductor, 97a 97b: Divided portions of dummy conductors, 101, 102 ... inner conductors, 111-114 ... through-hole electrodes, F ... stacked LC composite parts, C ... capacitors, L1, L2 ... coils.

Claims (6)

A coil part having a coil constituted by a plurality of internal conductors arranged along a lamination direction of a plurality of insulators and a plurality of insulators are laminated and the insulators are laminated A capacitor unit having a capacitor composed of a plurality of capacitor electrodes arranged along the direction, and a laminate having
One side surface perpendicular to the stacking direction of the insulator in the capacitor portion constitutes one side surface perpendicular to the stacking direction of the insulator in the stacked body,
The capacitor portion is electrically connected to the inner conductor and the capacitor electrode between the one side surface of the multilayer body and a capacitor electrode closest to the one side surface of the plurality of capacitor electrodes. A laminated LC composite component comprising an insulated dummy conductor. The stacked body has a pair of side surfaces that are parallel to the stacking direction of the insulator and face each other,
An input terminal electrode electrically connected to the coil is formed on one side surface of the pair of side surfaces,
An output terminal electrode that is electrically connected to the coil is formed on the other side surface of the pair of side surfaces,
2. The multilayer LC composite component according to claim 1, wherein the dummy conductor is divided into a plurality in the opposing direction of the pair of side surfaces.   3. The multilayer LC composite component according to claim 2, wherein an interval in a facing direction of the pair of side surfaces between the divided portions of the dummy conductor is set to 50 μm or more. On the side surface of the laminate, an input terminal electrode and an output terminal electrode are formed so as to have an interval in a predetermined direction,
The multilayer LC composite component according to claim 1, wherein the dummy conductor is divided into a plurality of pieces in the predetermined direction.   5. The multilayer LC composite component according to claim 4, wherein an interval in the predetermined direction between the divided portions of the dummy conductor is set to 50 μm or more.   2. The multilayer according to claim 1, wherein an outer contour of the dummy conductor coincides with an outer contour of the capacitor electrode that is closest to the one side surface or is larger than an outer contour of the capacitor electrode. Type LC composite parts.

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