JP5857871B2 - Multilayer capacitor - Google Patents

Description

  The present invention relates to a multilayer capacitor, and more particularly to a multilayer capacitor having an increased equivalent series resistance (ESR).

  As an ESR-enhanced multilayer capacitor, an element body in which a plurality of dielectric layers are laminated, first and second terminal electrodes and first and second external connection conductors disposed on the outer surface of the element body, A first internal electrode connected to the first external connection conductor; a second internal electrode connected to the second external connection conductor; a capacitance portion; a first terminal electrode and a first external connection conductor; A first equivalent series resistance control unit having a first internal connection conductor to be connected, a second internal connection conductor connected to the second terminal electrode and the second external connection conductor, and a stacking direction of a plurality of dielectric layers Is provided with a second equivalent series resistance control unit disposed so as to sandwich the capacitance unit between the first equivalent series resistance control unit and the first equivalent series resistance control unit (see, for example, Patent Document 1). .

  In the multilayer capacitor described in Patent Document 1, the first inner connecting conductor includes a first main conductor portion and a first lead portion extending in the first direction from the first main conductor portion and connected to the first outer connecting conductor. And a second lead portion extending from the first main conductor portion in the second direction and connected to the first terminal electrode. The second lead portion has a length in the second direction that is longer than a length in the first direction of the first lead portion, and a width in a direction perpendicular to the second direction in the second direction of the first main conductor portion. It is narrower than the width in the orthogonal direction. The second inner connecting conductor includes a second main conductor portion, a third lead portion extending in the third direction from the second main conductor portion and connected to the second outer connecting conductor, and a second main conductor portion from the second main conductor portion. A fourth lead portion extending in four directions and connected to the second terminal electrode. The fourth lead portion has a length in the fourth direction that is longer than a length in the third direction of the third lead portion, and a width in a direction orthogonal to the fourth direction in the fourth direction of the second main conductor portion. It is narrower than the width in the orthogonal direction.

JP 2011-108785 A

  The present invention further ensures the electrical connection between the first internal connection conductor and the first terminal electrode and the electrical connection between the second internal connection conductor and the second terminal electrode while ensuring a high ESR. An object of the present invention is to provide a multilayer capacitor capable of satisfying the requirements.

  The multilayer capacitor in accordance with the present invention includes an element body in which a plurality of dielectric layers are laminated, first and second terminal electrodes and first and second external connection conductors disposed on the outer surface of the element body, Connected to the capacitance portion having the first internal electrode connected to the one external connection conductor and the second internal electrode connected to the second external connection conductor, the first terminal electrode and the first external connection conductor A first internal connection conductor, a second internal connection conductor connected to the second terminal electrode and the second external connection conductor, and the first internal connection conductor and the second internal connection in the stacking direction of the plurality of dielectric layers And a third internal electrode that is located between the conductor and connected to the first external connection conductor or the second external connection conductor, and is separated from each other so as to sandwich the capacitance portion in the stacking direction. A plurality of equivalent series resistance control units arranged, and a first internal connection The body includes a first main conductor portion, a first lead portion extending in the first direction from the first main conductor portion and connected to the first external connection conductor, and a second lead portion connected to the first terminal electrode, A first connecting portion that extends in the second direction and connects the first main conductor portion and the second lead portion, and the second internal connection conductor extends from the second main conductor portion and the second main conductor portion. A third lead portion extending in the third direction and connected to the second external connection conductor; a fourth lead portion connected to the second terminal electrode; and a second main conductor portion and the fourth lead extending in the fourth direction. A second connecting part that connects the parts, wherein the first connecting part has a length in the second direction that is longer than a length in the first direction of the first lead-out part and is perpendicular to the second direction. Is narrower than the width of the first main conductor portion in the direction perpendicular to the second direction, and the second connecting portion has a length in the fourth direction that is longer than the length of the third lead portion in the third direction. Longer, fourth The width in the direction orthogonal to the second main conductor portion is narrower than the width in the direction orthogonal to the fourth direction, and the second lead-out portion has a width in the direction orthogonal to the second direction of the first connecting portion. It is wider than the width in the direction orthogonal to the second direction, and the fourth lead-out portion has a width in the direction orthogonal to the fourth direction larger than the width in the direction orthogonal to the fourth direction of the second connecting portion. It is characterized by.

  In the multilayer capacitor according to the present invention, the first internal electrode is connected to the first external connection conductor, and the second internal electrode is connected to the second external connection conductor in the capacitance portion. In the equivalent series resistance control unit, the first inner connecting conductor is connected to the first terminal electrode and the first outer connecting conductor, respectively, and the second inner connecting conductor is connected to the second terminal electrode and the second outer connecting conductor, respectively. ing. Therefore, the first external connection conductor to which the first internal electrode is connected in parallel is connected in series to the first terminal electrode, and the second external connection conductor to which the second internal electrode is connected in parallel is the second terminal electrode Therefore, a high ESR is realized as compared with a multilayer capacitor in which all internal electrodes are connected in parallel to corresponding terminal electrodes.

  In the first internal connection conductor, the first connecting portion has a length in the second direction that is longer than a length in the first direction of the first lead portion, and a width in the direction orthogonal to the second direction is the first. The width of the first main conductor portion is narrower than the width in the direction perpendicular to the second direction. In the second inner connecting conductor, the second connecting portion has a length in the fourth direction in the third direction of the third lead portion. The width in the direction orthogonal to the fourth direction is longer than the length and is narrower than the width in the direction orthogonal to the fourth direction of the second main conductor portion. As a result, the current path is narrowed by the first and second connecting portions, and a higher ESR can be obtained.

  In the first internal connection conductor, the width of the second lead portion in the direction orthogonal to the second direction is wider than the width in the direction orthogonal to the second direction of the first coupling portion. Thereby, the connection area of a 1st internal connection conductor and a 1st terminal electrode will increase, and the electrical connection of a 1st internal connection conductor and a 1st terminal electrode can be ensured still more reliably. In the second internal connection conductor, the fourth lead portion has a width in a direction orthogonal to the fourth direction wider than a width in a direction orthogonal to the fourth direction of the second coupling portion. Thereby, the connection area of a 2nd internal connection conductor and a 2nd terminal electrode will increase, and the electrical connection of a 2nd internal connection conductor and a 2nd terminal electrode can be ensured still more reliably.

  In a plurality of equivalent series resistance control units, a capacitance component is formed by the third internal electrode connected to the first external connection conductor or the second external connection conductor and the second internal connection conductor or the first internal connection conductor Will be. Thereby, the capacitance of the multilayer capacitor can be sufficiently secured.

  As described above, the plurality of equivalent series resistance control units are arranged away from each other so as to sandwich the capacitance unit therebetween in the stacking direction. Thereby, the directionality in the lamination direction when the multilayer capacitor is mounted is eliminated, and the mounting workability can be improved.

  The first and second internal connection conductors and the first, second, and third internal electrodes may be rounded so that each corner located in the element body is curved. In this case, the corners of the first and second internal connecting conductors and the first, second, and third internal electrodes are prevented from being exposed to the outer surface of the element body and serving as a starting point for internal structural defects. Can do.

The curvature at the corner formed by the first main conductor portion and the first connecting portion is larger than the curvature at the corner formed by the second lead portion and the first connecting portion, and the second main conductor portion and the second connecting portion are The curvature at the corner formed by may be greater than the curvature at the corner formed by the fourth lead portion and the second connecting portion. In this case, a current path between the first terminal electrode and the first external connection conductor in the first internal connection conductor, and a current path between the second terminal electrode and the second external connection conductor in the second internal connection conductor; Is suppressed from being shortened. Thereby, the fall of ESR can be suppressed.

  The contours inside the element bodies of the second and fourth lead portions may coincide with the contours of the first and second internal electrodes when viewed from the stacking direction. In this case, the occurrence of local steps in the element body is suppressed. Thereby, generation | occurrence | production of the disconnection between a 1st and 2nd internal connection conductor, especially between a 1st connection part and a 2nd drawer part and between a 2nd connection part and a 4th drawer part can be prevented.

  The plurality of equivalent series resistance control units includes a third internal electrode connected to the first external connection conductor, and a fourth internal electrode connected to the second external connection conductor and arranged to face the third internal electrode in the stacking direction. An internal electrode. In this case, the capacitance of the multilayer capacitor can be more sufficiently ensured.

  According to the present invention, while ensuring high ESR, the electrical connection between the first internal connection conductor and the first terminal electrode and the electrical connection between the second internal connection conductor and the second terminal electrode are more reliably ensured. A multilayer capacitor that can be provided can be provided.

It is a perspective view which shows the multilayer capacitor which concerns on this embodiment. It is a disassembled perspective view which shows the structure of an element body. It is a figure for demonstrating the cross-sectional structure along the III-III line in FIG. It is a top view which shows the internal electrode which an electrostatic capacitance part has. It is a top view which shows the internal connection conductor which an equivalent series resistance control part has. It is a top view which shows the internal electrode which an equivalent series resistance control part has. It is a top view which shows an internal electrode and an internal connection conductor.

  Hereinafter, preferred embodiments of the present 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.

  First, the configuration of the multilayer capacitor C according to the present embodiment will be described with reference to FIGS. FIG. 1 is a perspective view showing the multilayer capacitor in accordance with this embodiment. FIG. 2 is an exploded perspective view showing the configuration of the element body. FIG. 3 is a diagram for explaining a cross-sectional configuration along the line III-III in FIG. 1.

  As shown in FIG. 1, the multilayer capacitor C includes an element body L having dielectric characteristics, a pair of terminal electrodes 1 and 2 and a pair of external connection conductors 3 and 4 disposed on the outer surface of the element body L. I have.

  As shown in FIG. 1, the element body L has a substantially rectangular parallelepiped shape, and has substantially rectangular first and second main surfaces La and Lb facing each other as outer surfaces thereof, and first and second side surfaces facing each other. Lc, Ld and opposing third and fourth side surfaces Le, Lf. The first and second side surfaces Lc and Ld extend in the short side direction of the first and second main surfaces La and Lb so as to connect the first and second main surfaces. The third and fourth side surfaces Le and Lf extend in the long side direction of the first and second main surfaces La and Lb so as to connect the first and second main surfaces. The element body L includes a ridge line portion located between two adjacent surfaces La, Lb, Lc, Ld, Le, and Lf. Each ridge portion is rounded so as to be curved, and so-called R chamfering is performed.

  The terminal electrode 1 is disposed on the first side face Lc of the element body L. The terminal electrode 1 covers the first and second main faces La and Lb and the ends of the third and fourth side faces Le and Lf (ends on the first side face Lc side) so as to cover the entire first side face Lc. Is formed. The terminal electrode 2 is disposed on the second side face Ld of the element body L. The terminal electrode 2 covers the first and second main surfaces La and Lb and the ends of the third and fourth side surfaces Le and Lf (ends on the second side surface Ld side) so as to cover the entire surface of the second side surface Ld. Is formed. The pair of terminal electrodes 1 and 2 are opposed to the opposing direction of the first and second side faces Lc and Ld.

  The external connection conductor 3 is disposed on the third side face Le of the element body L. The external connection conductor 3 covers substantially the center in the facing direction of the first and second side faces Lc, Ld of the third side face Le so as to cross along the facing direction of the first and second main faces La, Lb. Yes. The external connection conductor 3 further covers part of the end portions of the first and second main surfaces La and Lb on the third side surface Le side.

  The external connection conductor 4 is disposed on the fourth side face Lf of the element body L. The external connection conductor 4 covers substantially the center in the opposing direction of the first and second side faces Lc, Ld of the fourth side face Lf so as to cross along the opposing direction of the first and second main faces La, Lb. Yes. The external connection conductor 4 further covers part of the end portions on the fourth side face Lf side of the first and second main faces La and Lb. The pair of external connection conductors 3 and 4 oppose each other in the opposing direction of the third and fourth side faces Le and Lf.

  The terminal electrodes 1 and 2 and the external connection conductors 3 and 4 are formed, for example, by applying a conductive paste containing conductive metal powder and glass frit to the outer surface of the element body L and baking it. If necessary, a plating layer may be formed on the baked electrodes and conductors. The terminal electrodes 1, 2 and the external connection conductors 3, 4 are spaced apart and are electrically insulated from each other on the surface of the element body L.

  In the multilayer capacitor C, the first main surface La or the second main surface Lb is mounted on the electronic device as a mounting surface for the electronic device (for example, a circuit board or an electronic component). When the multilayer capacitor C is mounted so that the second main surface Lb of the element body L faces the circuit board B, the terminal electrodes 1 and 2 are connected to the wiring pads WP1 and WP2 arranged on the circuit board B. The external connection conductors 3 and 4 are not connected to the wiring pads arranged on the circuit board B. The wiring pads WP1 and WP2 are connected to the wiring formed on the circuit board B. That is, only the terminal electrodes 1 and 2 are electrically connected to the wiring, and the external connection conductors 3 and 4 are not electrically connected to the wiring. The external connection conductors 3 and 4 may be connected to the wiring pads as long as they are wiring pads that are electrically insulated from the wiring.

As shown in FIGS. 2 and 3, the element body L is configured by laminating a plurality of dielectric layers 7 in the opposing direction of the first and second main surfaces La and Lb. In the element body L, the opposing direction of the first and second main surfaces La and Lb is the stacking direction of the plurality of dielectric layers (hereinafter simply referred to as “stacking direction”). Each dielectric layer 7 is a sintered body of a ceramic green sheet containing, for example, a dielectric ceramic (a dielectric ceramic such as BaTiO ₃ series, Ba (Ti, Zr) O ₃ series, or (Ba, Ca) TiO ₃ series). Consists of The actual element body L is integrated so that the boundary between the dielectric layers 7 cannot be visually recognized.

  The multilayer capacitor C includes an electrostatic capacity unit 11 and a pair of equivalent series resistance control units (hereinafter referred to as “ESR control units”) 13 and 15. The pair of ESR control units 13 and 15 sandwich the capacitance unit 11 in the facing direction of the first and second main surfaces La and Lb, that is, in the stacking direction. The ESR control unit 13 is positioned between the capacitance unit 11 and the first main surface La, and the ESR control unit 15 is positioned between the capacitance unit 11 and the second main surface Lb. The capacitance part 11 mainly contributes to the formation of the capacitance component of the multilayer capacitor C.

  The capacitance unit 11 has a plurality of internal electrodes 21 and a plurality of internal electrodes 23. The capacitance part 11 is formed by arranging these internal electrodes 21 and 23 via the dielectric layer 7. In the element body L, the internal electrodes 21 and the internal electrodes 23 are alternately arranged so as to face each other with an interval in the facing direction (lamination direction) between the first main surface La and the second main surface Lb. Yes.

  As shown in FIG. 4, each internal electrode 21 includes a main electrode portion 21a having a substantially rectangular shape, and a lead portion 21b extending from one side of the main electrode portion 21a and exposed to the third side face Le. . The internal electrode 21 is rounded so that each corner located in the element body L is curved. The external connection conductor 3 is formed so as to cover all the portions exposed to the third side face Le of the respective lead portions 21b, and the lead portions 21b are directly connected to the external connection conductor 3. As a result, the internal electrodes 21 are electrically connected to each other through the external connection conductor 3.

  As shown in FIG. 4, each internal electrode 23 has a substantially rectangular shape and a main electrode portion 23a facing the main electrode portion 21a, and a lead portion extending from one side of the main electrode portion 23a and exposed to the fourth side face Lf. 23b. The internal electrode 23 is also rounded so that each corner located in the element body L is curved. A portion of the dielectric layer 7 that overlaps the main electrode portion 21a of the internal electrode 21 and the main electrode portion 23a of the internal electrode 23 is a region that substantially generates a capacitance component. The external connection conductor 4 is formed so as to cover all the portions exposed to the fourth side face Lf of each extraction portion 23b, and the extraction portion 23b is directly connected to the external connection conductor 4. As a result, the internal electrodes 23 are electrically connected to each other through the external connection conductor 4.

  The ESR control units 13 and 15 have a plurality of internal connection conductors 31 and 33 and a plurality of internal electrodes 35 and 37, respectively. The ESR control units 13 and 15 are formed by arranging the internal connection conductors 31 and 33 and the internal electrodes 35 and 37 through the dielectric layer 7. In the element body L, the internal connection conductors 31 and 33 and the internal electrodes 35 and 37 are opposed to each other with an interval in the facing direction (stacking direction) between the first main surface La and the second main surface Lb. Has been placed. In the present embodiment, the internal connection conductors 31 and 33 and the internal electrodes 35 and 37 are in the direction from the first main surface La to the second main surface Lb, and the internal connection conductor 31, the internal electrode 37, the internal electrode 35, and the internal connection. The conductors 33 are arranged in this order.

  As shown in FIG. 5, the internal connection conductor 31 includes a main conductor portion 31a having a substantially rectangular shape, a lead portion 31b extending from the main conductor portion 31a in the first direction and exposed to the third side surface Le, The lead part 31c exposed to the one side face Lc and a connecting part 31d that extends in the second direction and connects the main conductor part 31a and the lead part 31c are included. The connecting portion 31d is connected to the end portion on the fourth side face Lf side in the main conductor portion 31a and the end portion on the fourth side face Lf side in the lead portion 31c. That is, the connecting portion 31d is connected to the end portion of the main conductor portion 31a that is far from the lead portion 31b. The first direction is a direction from the fourth side face Lf toward the third side face Le. The second direction is a direction in which the first side face Lc and the second side face Ld face each other. The internal connection conductor 31 is rounded so that each corner located in the element body L is curved.

  The external connection conductor 3 is formed so as to cover all portions exposed to the third side face Le of the lead portion 31b, and the lead portion 31b is also directly connected to the external connection conductor 3. The terminal electrode 1 is formed so as to cover all portions exposed to the first side face Lc of the lead portion 31 c, and the lead portion 31 c is directly connected to the terminal electrode 1. Thereby, the terminal electrode 1 and the external connection conductor 3 are electrically connected to each other through the internal connection conductor 31. The internal connection conductor 31 is electrically connected to the internal electrode 21 through the external connection conductor 3.

  As shown in FIG. 5, the internal connection conductor 33 includes a main conductor portion 33a having a substantially rectangular shape, a lead portion 33b extending from the main conductor portion 33a in the third direction and exposed to the fourth side face Lf, A lead portion 33c exposed on the two side faces Ld and a connecting portion 33d extending in the fourth direction and connecting the main conductor portion 33a and the lead portion 33c are included. The connecting portion 33d is connected to the end portion on the third side face Le side in the main conductor portion 33a and the end portion on the third side face Le side in the lead portion 33c. That is, the connecting portion 33d is connected to the end portion of the main conductor portion 33a that is far from the lead portion 33b. The third direction is a direction opposite to the first direction and is a direction from the third side face Le toward the fourth side face Lf. The fourth direction is the same as the second direction, and is the direction in which the first side face Lc and the second side face Ld face each other. The internal connection conductor 33 is rounded so that each corner located in the element body L is curved.

  The external connection conductor 4 is formed so as to cover all the portions exposed to the fourth side face Lf of the lead portion 33b, and the lead portion 33b is also directly connected to the external connection conductor 4. The terminal electrode 2 is formed so as to cover all portions exposed to the second side face Ld of the lead portion 33c, and the lead portion 33c is directly connected to the terminal electrode 2. Thereby, the terminal electrode 2 and the external connection conductor 4 are electrically connected to each other through the internal connection conductor 33. The internal connection conductor 33 is electrically connected to the internal electrode 23 through the external connection conductor 4.

  As shown in FIG. 6, the internal electrode 35 includes a main electrode portion 35 a having a substantially rectangular shape, and a lead portion 35 b extending from one side of the main electrode portion 35 a and exposed to the third side face Le. The internal electrode 35 is rounded so that each corner located in the element body L is curved. The external connection conductor 3 is formed so as to cover all the portions exposed to the third side face Le of each lead-out portion 35b, and the lead-out portion 35b is directly connected to the external connection conductor 3. Thereby, the internal electrode 35 is electrically connected to the internal electrode 21 and the internal connection conductor 31 through the external connection conductor 3. The internal electrodes 21 and 35 are connected only to the external connection conductor 3.

  As shown in FIG. 6, the internal electrode 37 has a substantially rectangular shape and is opposed to the main electrode portion 35a, and a lead portion 37b extending from one side of the main electrode portion 37a and exposed to the fourth side face Lf. And. The internal electrode 37 is also rounded so that each corner located in the element body L is curved. The external connection conductor 4 is formed so as to cover all the portions exposed to the fourth side face Lf of each extraction portion 37b, and the extraction portion 37b is directly connected to the external connection conductor 4. As a result, the internal electrode 37 is electrically connected to the internal electrode 23 and the internal connection conductor 33 through the external connection conductor 4. The internal electrodes 23 and 37 are connected only to the external connection conductor 4.

  Of the dielectric layer 7, a portion overlapping the main conductor portion 31 a of the internal connection conductor 31 and the main electrode portion 37 a of the internal electrode 37, and a portion overlapping the main electrode portion 37 a of the internal electrode 37 and the main electrode portion 35 a of the internal electrode 35. The portion and the portion overlapping the main electrode portion 35a of the internal electrode 35 and the main conductor portion 33a of the internal connection conductor 33 are regions that substantially generate a capacitance component. That is, in the present embodiment, not only the capacitance unit 11 but also each ESR control unit 13, 15 forms a capacitance component.

As shown in FIG. 5, the lengths l _31d and l _33d in the second direction (fourth direction) of the connecting portions 31d and 33d are the lengths in the first direction (third direction) of the lead portions 31b and 33b. It is longer than _l31b and _l33b . The widths w _31d and w _33d in the direction orthogonal to the second direction (fourth direction) of the coupling portions 31d and 33d are the widths in the direction orthogonal to the second direction (fourth direction) of the main conductor portions 31a and 33a. It is narrower than w _31a and w _33a .

The widths w _31c and w _33c in the direction orthogonal to the second direction (fourth direction) of the lead portions 31c and 33c are wider than the widths w _31d and w _33d of the connecting portions 31d and 33d. In the present embodiment, the widths w _31c and w _33c of the lead portions 31c and 33c are equal to the widths w _31a and w _33a of the main conductor portions 31a and 33a.

The curvature at the corner A1 formed by the main conductor portion 31a and the connecting portion 31d is larger than the curvature at the corner A2 formed by the lead-out portion 31c and the connecting portion 31d. The curvature at the corner A3 formed by the main conductor portion 33a and the connecting portion 33d is larger than the curvature at the corner A4 formed by the lead-out portion 33c and the connecting portion 33d. The corners A1 and A2 face the third side face Le where the lead-out part 31b is exposed as seen from the stacking direction. The corners A3 and A4 face the fourth side face Lf where the lead-out part 33b is exposed as seen from the stacking direction.

  As shown in FIG. 7, the contours inside the element body L of the lead portions 31 c and 33 c coincide with the contours of the internal electrodes 21, 23, 35, and 37 when viewed from the stacking direction. Specifically, the contour P1 on the second side face Ld side of the lead portion 31c coincides with the contour P3 on the first side face Lc side of the internal electrodes 21, 23, 35, 37 when viewed from the stacking direction. A contour P2 on the first side face Lc side of the lead portion 33c coincides with a contour P4 on the second side face Ld side of the internal electrodes 21, 23, 35, 37 when viewed from the stacking direction.

  As described above, in the present embodiment, the internal electrodes 21 and 23 are connected only to the corresponding external connection conductors 3 and 4 in the electrostatic capacitance unit 11, and the internal connection conductors 31 and 33 are compatible in the ESR control units 13 and 15. Are connected to terminal electrodes 1 and 2 and external connection conductors 3 and 4, respectively. Therefore, since the external connection conductors 3 and 4 having the internal electrodes 21 and 23 connected in parallel are connected in series to the terminal electrodes 1 and 2, in the multilayer capacitor C, all internal electrodes are connected in parallel to the corresponding terminal electrodes. High ESR is realized as compared with the multilayer capacitor.

The lengths l _31d and l _33d of the connecting portions 31d and 33d are longer than the lengths l _31b and l _33b of the lead portions 31b and 33b. The widths w _31d and w _33d of the coupling portions 31d and 33d are narrower than the widths w _31a and w _33a of the main conductor portions 31a and 33a. Therefore, the current path is narrowed in the connecting portions 31d and 33d of the internal connection conductors 31 and 33, and higher ESR can be obtained.

The widths w _31c and w _33c of the lead portions 31c and 33c are wider than the widths w _31d and w _33d of the connecting portions 31d and 33d. As a result, the connection area between the internal connection conductors 31 and 33 and the terminal electrodes 1 and 2 increases, and the electrical connection between the internal connection conductors 31 and 33 and the terminal electrodes 1 and 2 can be more reliably ensured. Can do.

  In the ESR control units 13 and 15, capacitance components are formed by the internal electrodes 35 and 37 and the internal connection conductors 31 and 33. Thereby, the capacitance of the multilayer capacitor C can be sufficiently secured.

  The ESR control units 13 and 15 are arranged apart from each other so as to sandwich the capacitance unit 11 therebetween in the stacking direction. Thereby, the directionality in the lamination direction at the time of mounting the multilayer capacitor C is lost, and the mounting workability can be improved.

  In the present embodiment, the number of stacked internal electrodes 35 and 37 in each ESR control unit 13 and 15 is smaller than the number of stacked internal electrodes 21 and 23 in the capacitance unit 11. Thereby, even if each ESR control part 13 and 15 has the internal electrodes 35 and 37, the electric current path from one terminal electrode 1 and 2 to the other terminal electrode 2 and 1 becomes comparatively short, and equivalent series An increase in inductance (ESL) is suppressed.

  The internal electrodes 21, 23, 35, 37 and the internal connection conductors 31, 33 are rounded so that each corner located in the element body L is curved. In this case, the ridgeline of the element body L at the corners of the main electrode portions 21a, 23a, 35a, 37a of the internal electrodes 21, 23, 35, 37 and the corner portions of the main conductor portions 31a, 33a of the internal connection conductors 31, 33 A distance from the portion is secured, and the corners can be prevented from being exposed on the outer surface of the element body L.

  In the vicinity of the corners A1, A2, A3, and A4 of the internal connection conductors 31 and 33, air tends to remain and voids are likely to occur in the multilayer capacitor C manufacturing process, particularly in the green sheet stacking process. Corners A1, A2, A3, and A4 where voids are formed in the vicinity serve as starting points for internal structural defects. On the other hand, since the corners A1, A2, A3, and A4 are rounded so as to be curved, it is difficult for air to remain in the green sheet laminating process, and generation of voids can be suppressed. Therefore, the corners A1, A2, A3, A4 can be prevented from becoming the starting point of the internal structural defect.

Curvature at the corner portion A1 is greater than the curvature at the corner A2, the curvature at the corners A3 is greater than the curvature at the corner A4. In this case, a curvature at the corner portion A1 is less curvature at the corner A2, as compared with the configuration of curvature at the corner portion A3 is equal to or less than the curvature at the corner A4, terminal electrodes 1 and 2 in the inner connecting conductor 31, 33 And the external connection conductors 3 and 4 have a long current path. Therefore, the current path between the terminal electrodes 1 and 2 and the external connection conductors 3 and 4 in the internal connection conductors 31 and 33 is suppressed from being shortened. Thereby, the fall of ESR can be suppressed.

  The contours P1 and P2 inside the element body L of the lead portions 31c and 33c coincide with the contours P3 and P4 of the internal electrodes 21, 23, 35, and 37 when viewed from the stacking direction. Thereby, it is suppressed that the local level | step difference generate | occur | produces in the element | base_body L. FIG. As a result, it is possible to prevent the occurrence of disconnection between the internal connection conductors 31, 33, in particular, between the coupling portions 31d, 33d and the lead portions 31c, 33c.

  The preferred embodiments of the present invention have been described above. However, the present invention is not necessarily limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

In the present embodiment, the widths w _31c and w _33c of the lead portions _31c and _33c are equivalent to the widths w _31a and w _33a of the main conductor portions 31a and 33a, but are not limited thereto. The widths w _31c and w _33c of the lead portions 31c and 33c may be smaller or larger than the widths w _31a and w _33a of the main conductor portions 31a and 33a.

  The ESR control units 13 and 15 have the internal electrode 35 and the internal electrode 37, respectively, but are not limited to this, and have only one of the internal electrode 35 and the internal electrode 37. Also good. Although the internal electrode 35 and the internal electrode 37 are located in different layers, the internal electrode 35 faces the main conductor portion 33a of the internal connection conductor 33 and the internal electrode 37 is not limited to this. The internal electrode 35 and the internal electrode 37 may be located in the same layer as long as they face the main conductor portion 31a.

  The stacking order of the internal connection conductors 31 and 33 and the internal electrodes 35 and 37 in each of the ESR control units 13 and 15 may be the same as described above, or may be reversed.

  The connection positions between the coupling portions 31d and 33d and the main conductor portions 31a and 33a and the connection positions between the coupling portions 31d and 33d and the lead-out portions 31c and 33c are not limited to the positions in the above-described embodiment. However, when the connecting positions of the connecting portions 31d and 33d and the main conductor portions 31a and 33a and the connecting positions of the connecting portions 31d and 33d and the lead-out portions 31c and 33c are the positions in the present embodiment, the internal connecting conductor 31 and 33, the current path between the terminal electrodes 1 and 2 and the external connection conductors 3 and 4 becomes longer, and higher ESR can be realized.

  DESCRIPTION OF SYMBOLS 1, 2 ... Terminal electrode, 3, 4 ... External connection conductor, 11 Electrostatic capacity part, 13, 15 ... Equivalent series resistance (ESR) control part, 21, 23 ... Internal electrode, 31, 33 ... Internal connection conductor, 31a , 33a ... main conductor part, 31b, 33b, 31c, 33c ... lead-out part, 31d, 33d ... coupling part, 35, 37 ... internal electrode, A1, A2, A3, A4 ... corner part, C ... multilayer capacitor, L ... Elementary body.

Claims (3)

An element body in which a plurality of dielectric layers are laminated;
The first and second terminal electrodes and the first and second external connecting conductors disposed on the outer surface of the element body;
A capacitance portion having a first internal electrode connected to the first external connection conductor and a second internal electrode connected to the second external connection conductor;
A first internal connection conductor connected to the first terminal electrode and the first external connection conductor; a second internal connection conductor connected to the second terminal electrode and the second external connection conductor; A third internal electrode located between the first internal connection conductor and the second internal connection conductor and connected to the first external connection conductor or the second external connection conductor in the stacking direction of the dielectric layers; And a plurality of equivalent series resistance control units arranged apart from each other so as to sandwich the capacitance unit in the stacking direction,
The first internal connection conductor includes a first main conductor portion, a first lead portion extending in a first direction from the first main conductor portion and connected to the first external connection conductor, and the first terminal electrode. A second lead portion to be connected, a first connecting portion extending in the second direction and connecting the first main conductor portion and the second lead portion;
Including
The second inner connecting conductor includes a second main conductor portion, a third lead portion extending from the second main conductor portion in the third direction and connected to the second outer connecting conductor, and the second terminal electrode. A fourth lead portion to be connected; a second connecting portion extending in the fourth direction to connect the second main conductor portion and the fourth lead portion;
Including
The first connecting portion has a length in the second direction longer than a length in the first direction of the first lead portion, and a width in a direction orthogonal to the second direction is the first main conductor. Narrower than the width in the direction perpendicular to the second direction of the part,
The second connecting portion has a length in the fourth direction that is longer than a length in the third direction of the third lead portion, and a width in a direction orthogonal to the fourth direction is the second main conductor. Narrower than the width in the direction perpendicular to the fourth direction of the part,
The second drawer portion has a width in a direction orthogonal to the second direction wider than a width in a direction orthogonal to the second direction of the first connection portion,
The fourth lead portion is widely than the width in the direction in which the width in the direction perpendicular to the fourth direction is perpendicular to the fourth direction of said second connecting portion,
The first and second internal connection conductors and the first, second, and third internal electrodes are rounded so that each corner located in the element body is curved,
The curvature at the corner formed by the first main conductor portion and the first connection portion is larger than the curvature at the corner formed by the second lead portion and the first connection portion,
A multilayer capacitor , wherein a curvature at a corner portion formed by the second main conductor portion and the second connection portion is larger than a curvature at a corner portion formed by the fourth lead portion and the second connection portion . The second and the element assembly side of the contour of the fourth lead portion is, when viewed from the laminating direction, according to claim 1, characterized in that it matches the contour of the first and second internal electrodes Multilayer capacitor. The plurality of equivalent series resistance control units are connected to the third internal electrode connected to the first external connection conductor, connected to the second external connection conductor, and opposed to the third internal electrode in the stacking direction. 4. The multilayer capacitor according to claim 1, further comprising a fourth internal electrode disposed on the surface of the multilayer capacitor.

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