JP6064362B2 - Multilayer capacitor - Google Patents

Description

  The present invention relates to a multilayer capacitor.

  As a multilayer capacitor, an element body in which a plurality of dielectric layers are laminated, a first terminal electrode disposed on the first side surface of the element body, and a second surface disposed on the second side surface facing the first side surface of the element body. A two-terminal electrode, a first external connection conductor disposed on the third side surface of the element body, a second external connection conductor disposed on the fourth side surface facing the third side surface of the element body, and drawn out to the third side surface A first internal electrode connected to the first external connection conductor, a second internal electrode drawn to the fourth side surface and connected to the second external connection conductor, and a first side surface Connected to the first terminal electrode and connected to the first side connecting electrode and connected to the first external connecting conductor and connected to the second side electrode connected to the second terminal electrode. And a second inner connecting conductor that is pulled out to the fourth side surface and connected to the second outer connecting conductor, Those with equivalent series resistance control unit, the having are known (e.g., see Patent Document 1).

  In the multilayer capacitor having the configuration described above, in the capacitance section, the first internal electrode is connected to the first external connection conductor, the second internal electrode is connected to the second external connection conductor, and in the equivalent series resistance control section, The first internal connection conductor is connected to the first terminal electrode and the first external connection conductor, respectively, and the second internal connection conductor is connected to the second terminal electrode and the second external connection conductor, respectively. 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 equivalent series resistance (ESR) is realized as compared with a multilayer capacitor in which all internal electrodes are connected in parallel to corresponding terminal electrodes.

JP 2003-168621 A

  An object of the present invention is to provide a multilayer capacitor capable of performing fine adjustment of ESR accurately and easily.

  The multilayer capacitor according to the present invention includes an element body in which a plurality of dielectric layers are laminated, a first terminal electrode disposed on a first side surface of the element body, and a second side surface facing the first side surface of the element body. A second terminal electrode disposed; a first external connection conductor disposed on a third side surface of the element body; a second external connection conductor disposed on a fourth side surface facing the third side surface of the element body; A capacitance part having a first internal electrode drawn to the three side surfaces and connected to the first external connection conductor; and a second internal electrode drawn to the fourth side surface and connected to the second external connection conductor; A first internal connection conductor drawn to the first side surface and connected to the first terminal electrode and drawn to the third side surface and connected to the first external connection conductor; and a second terminal drawn to the second side surface Second internal connection connected to the electrode and pulled out to the fourth side surface and connected to the second external connection conductor And a first internal connection conductor as a part of a contour located in the element body, facing the third side as viewed from the stacking direction of the plurality of dielectrics. The second inner connecting conductor has a second contour portion facing the fourth side as viewed from the stacking direction as a part of the contour located in the element body, and has a first contour portion and a second contour. The portion is a straight line portion extending in the first facing direction between the first side surface and the second side surface, a straight line portion extending in the second facing direction between the third side surface and the fourth side surface, and connecting these straight line portions. Each of the line portions, and the connection position between at least one straight line portion and the line portion is adjusted to set the equivalent series resistance to a desired value.

  In the multilayer capacitor according to the present invention, in the first internal connection conductor, the first terminal electrode and the first external connection are adjusted by adjusting the connection position of at least one straight line portion and the line portion included in the first contour portion. The length of the current path between the conductors will change. Similarly, in the second inner connecting conductor, the connection position between at least one straight line portion and the line portion included in the second contour portion is adjusted, so that the second inner connecting conductor is connected between the second terminal electrode and the second outer connecting conductor. The length of the current path will change. As a result, the equivalent series resistance of the multilayer capacitor is adjusted and set to a desired value. The equivalent series resistance is adjusted to a high value by increasing the current path described above, and the equivalent series resistance is adjusted to a low value by shortening the current path described above. Thus, in the present invention, in the first and second inner connecting conductors, the connection position between at least one straight line portion and the line portion included in the first contour portion and the second contour portion is adjusted very simply. With this configuration, fine adjustment of the equivalent series resistance can be performed with high accuracy.

The line portion may be curved. In this case, the line portion between the first contour portion and the second contour portion can be prevented from becoming the starting point of the internal structural defect. By the way, when the line part is curved, the connection position between the straight line part and the line part is adjusted by changing the curvature of the line part. When the curvature is increased , the current path is lengthened and the equivalent series resistance is adjusted to a high value, and when the curvature is decreased , the current path is shortened and the equivalent series resistance is adjusted to a low value.

  The connection position between the straight line part and the line part in the first contour part and the connection position between the straight line part and the line part in the second contour part may be different. In this case, fine adjustment of the equivalent series resistance can be performed with higher accuracy.

  ADVANTAGE OF THE INVENTION According to this invention, the multilayer capacitor which can perform fine adjustment of ESR accurately and easily 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 connection conductor. It is a top view which shows an internal connection conductor. It is a top view which shows the internal connection conductor in the modification of this embodiment. It is a top view which shows the internal connection conductor in the modification of this embodiment. It is a top view which shows the internal connection conductor in the modification of this embodiment. It is a top view which shows the internal connection conductor in the modification of this embodiment. It is a top view which shows the internal connection conductor in the modification of this embodiment. It is a top view which shows the internal connection conductor in the modification of this embodiment. It is a top view which shows the internal connection conductor in the modification of this embodiment. It is a top view which shows the internal connection conductor in the modification of this embodiment.

  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 21 a having a substantially rectangular shape, and a lead portion 21 b that extends from one side of the main electrode portion 21 a and is exposed by being exposed to the third side face Le. Contains. 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 is substantially rectangular and has a main electrode portion 23a that faces the main electrode portion 21a, and extends from one side of the main electrode portion 23a and is drawn out to the fourth side face Lf. And a drawer portion 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. Is arranged. 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 31 a having a substantially rectangular shape, and a lead portion 31 b extending from the main conductor portion 31 a in the first direction and drawn to the third side face Le to be exposed. And a lead part 31c that is drawn out and exposed by the first 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. 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, and a lead portion 33b extending from the main conductor portion 33a in the third direction and drawn to the fourth side face Lf to be exposed. And a lead portion 33c that is drawn and exposed to the second side face Ld, and a connecting portion 33d that extends in the fourth direction and connects the main conductor portion 33a and the lead portion 33c. 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 that extends from one side of the main electrode portion 35 a and is exposed to the third side face Le. It is out. 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 exposed to the main electrode portion 37a facing the main electrode portion 35a and from one side of the main electrode portion 37a and drawn to the fourth side face Lf. A lead-out portion 37b. 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 internal connection conductor 31 has a contour portion P1 that faces the third side face Le when viewed from the stacking direction as a part of the contour located in the element body L. The contour portion P1 includes main conductor portions 31a, connecting portions 31d, and respective contours of corner portions formed by the main conductor portions 31a and the connecting portions 31d. That is, as shown in FIG. 7, the contour portion P1 includes a straight portion P1a that is the contour of the main conductor portion 31a, a straight portion P1b that is the contour of the connecting portion 31d, the main conductor portion 31a, and the connecting portion 31d. And a line portion P1c which is an outline of a corner portion formed.

  The line portion P1c, which is the outline of the corner, extends in a direction away from the direction in which the straight portions P1a and P1b extend, and connects the straight portion P1a and the straight portion P1b. In the present embodiment, the line portion P1c is curved as described above. The corner faces the third side face Le from which the lead portion 31b is drawn as viewed from the stacking direction.

By changing the curvature of the line part P1c, the connection position between the straight line part P1a and the line part P1c and the connection position between the straight line part P1b and the line part P1c are changed. As a result, as shown in FIG. 7, the length of the current path CP <b> 1 between the terminal electrode 1 and the external connection conductor 3 in the internal connection conductor 31 changes. For example, as shown in FIG. 7A, when the curvature of the line portion P1c becomes smaller , the length of the current path CP1 becomes shorter, and as shown in FIG. 7C, the curvature of the line portion P1c. Becomes larger , the length of the current path CP1 becomes longer.

  The internal connection conductor 33 has a contour portion P2 facing the fourth side face Lf as seen from the stacking direction as a part of the contour located in the element body L. The contour portion P2 includes the main conductor portion 33a, the connecting portion 33d, and the respective contours of the corner portion formed by the main conductor portion 33a and the connecting portion 33d. That is, as shown in FIG. 8, the contour portion P2 includes a straight portion P2a that is the contour of the main conductor portion 33a, a straight portion P2b that is the contour of the coupling portion 33d, and a line portion P2c that is the contour of the corner portion. It consists of

  The line portion P2c, which is the outline of the corner, extends in a direction away from the direction in which the straight portions P2a and P2b extend, and connects the straight portion P2a and the straight portion P2b. In the present embodiment, the line portion P2c is curved as described above. The corner formed by the main conductor portion 33a and the connecting portion 33d faces the fourth side face Lf from which the lead portion 33b is drawn, as viewed from the stacking direction.

By changing the curvature of the line part P2c, the connection position between the straight line part P2a and the line part P2c and the connection position between the straight line part P2b and the line part P2c are changed. As a result, as shown in FIG. 8, the length of the current path CP <b> 2 between the terminal electrode 2 and the external connection conductor 4 in the internal connection conductor 33 changes. For example, as shown in FIG. 8A, when the curvature of the line portion P2c decreases , the length of the current path CP2 decreases, and as shown in FIG. 8C, the curvature of the line portion P2c. Becomes larger , the length of the current path CP2 becomes longer.

  A multilayer capacitor C in which the internal connection conductor 31 shown in FIG. 7A and the internal connection conductor 33 shown in FIG. 8A are adopted is shown in FIG. 7B. Due to the difference in the length of the current path CP1 compared to the multilayer capacitor C in which the illustrated internal connection conductor 31 is employed and the internal connection conductor 33 illustrated in FIG. ESR is adjusted to a low value. A multilayer capacitor C in which the internal connection conductor 31 shown in FIG. 7C is employed and the internal connection conductor 33 shown in FIG. 8C is adopted is shown in FIG. Due to the difference in the length of the current path CP1 compared to the multilayer capacitor C in which the illustrated internal connection conductor 31 is employed and the internal connection conductor 33 illustrated in FIG. ESR is adjusted to a high value.

  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.

  By the way, in this embodiment, in the internal connection conductor 31, the connection position of the linear parts P1a and P1b included in the outline part P1 and the line part P1c is adjusted, so that the connection between the terminal electrode 1 and the external connection conductor 3 is adjusted. The length of the current path CP1 is changed. Similarly, in the internal connection conductor 33, the current path CP2 between the terminal electrode 2 and the external connection conductor 4 is adjusted by adjusting the connection position of the straight line portions P2a and P2b and the line portion P2c included in the contour portion P2. The length of will change. As a result, the ESR of the multilayer capacitor C is adjusted and set to a desired value. The ESR is adjusted to a high value by increasing the current paths CP1 and CP2, and the ESR is adjusted to a low value by shortening the current paths CP1 and CP2. Therefore, in the multilayer capacitor C, the connecting positions of the linear portions P1a, P1b, P2a, P2b and the line portions P1c, P2c included in the contour portion P1 and the contour portion P2 are adjusted in the internal connection conductors 31, 33. With a very simple configuration, fine adjustment of ESR can be performed with high accuracy.

  In the vicinity of the line portions P1c and P2c of the internal connection conductors 31 and 33, air tends to remain and air gaps are likely to occur in the multilayer capacitor C manufacturing process, particularly in the green sheet stacking process. Line portions P1c and P2c in which gaps are generated in the vicinity serve as starting points of internal structural defects. In contrast, since the line portions P1c and P2c are curved, it is difficult for air to remain in the green sheet laminating step, and the generation of voids can be suppressed. Therefore, the line portions P1c and P2c can be prevented from becoming the starting point of the internal structural defect.

When the line portions P1c and P2c are curved, the curvature of the line portions P1c and P2c changes, so that the connection position between the straight portions P1a, P1b, P2a and P2b and the line portions P1c and P2c is adjusted. . By increasing the curvature of the line portions P1c and P2c, the current paths CP1 and CP2 are lengthened and the ESR is adjusted to a high value, and by reducing the curvature of the line portions P1c and P2c, the current paths CP1 and CP2 are Shorter, the ESR is adjusted to a lower value.

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.

  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.

  Subsequently, the configuration of the multilayer capacitor in accordance with a modification of the present embodiment will be described with reference to FIGS. 9 to 14 are plan views showing internal connection conductors according to modifications of the present embodiment.

  In this modification, the multilayer capacitor C has the internal connection conductors 31 and 33 shown in FIGS. 9 to 14 in the ESR control units 13 and 15. The internal connection conductor 31 and the internal connection conductor 33 have different curvatures of the line portions P1c and P2c. That is, the internal connection conductor 31 and the internal connection conductor 33 are different in the connection positions of the straight portions P1a and P1b and the line portion P1c and the connection positions of the straight portions P2a and P2b and the line portion P2c.

  In the multilayer capacitor C according to the modification shown in FIG. 9, the internal connection conductor 31 shown in FIG. 7B is adopted as the internal connection conductor 31, and the internal connection conductor 33 is shown in FIG. The internal connection conductor 33 shown in FIG. In the multilayer capacitor C according to the modification shown in FIG. 10, the internal connection conductor 31 shown in FIG. 7A is adopted as the internal connection conductor 31, and the internal connection conductor 33 is shown in FIG. The internal connection conductor 33 shown in FIG. The multilayer capacitor C according to the modification shown in FIG. 9 and the multilayer capacitor C according to the modification shown in FIG. 10 have the same ESR.

  In the multilayer capacitor C according to the modification shown in FIG. 11, the internal connection conductor 31 shown in FIG. 7C is adopted as the internal connection conductor 31, and the internal connection conductor 33 in FIG. The internal connection conductor 33 shown in FIG. In the multilayer capacitor C according to the modification shown in FIG. 12, the internal connection conductor 31 shown in FIG. 7A is adopted as the internal connection conductor 31, and the internal connection conductor 33 is shown in FIG. The internal connection conductor 33 shown in FIG. The multilayer capacitor C according to the modification shown in FIG. 11 and the multilayer capacitor C according to the modification shown in FIG. 12 have the same ESR.

  In the multilayer capacitor C according to the modification shown in FIG. 13, the internal connection conductor 31 shown in FIG. 7C is adopted as the internal connection conductor 31, and the internal connection conductor 33 is shown in FIG. The internal connection conductor 33 shown in FIG. In the multilayer capacitor C according to the modification shown in FIG. 14, the internal connection conductor 31 shown in FIG. 7B is adopted as the internal connection conductor 31, and the internal connection conductor 33 of FIG. The internal connection conductor 33 shown in FIG. The multilayer capacitor C according to the modification shown in FIG. 13 and the multilayer capacitor C according to the modification shown in FIG. 14 have the same ESR.

  In the multilayer capacitor C having the internal connection conductors 31 and 33 shown in FIGS. 9 to 14, the multilayer capacitor C according to the modification shown in FIG. 9 (the multilayer capacitor according to the modification shown in FIG. 10). 11), the multilayer capacitor C according to the modification shown in FIG. 11 (the multilayer capacitor C according to the modification shown in FIG. 12), and the multilayer capacitor C according to the modification shown in FIG. The ESR is adjusted to a higher value in the order of the multilayer capacitor C) according to the illustrated modification.

  The multilayer capacitor C according to the modification example shown in FIG. 9 (the multilayer capacitor C according to the modification example shown in FIG. 10) has the internal connection conductor 31 shown in FIG. And the ESR is adjusted to a higher value than the multilayer capacitor C in which the internal connection conductor 33 shown in FIG. 8A is used as the internal connection conductor 33. The multilayer capacitor C according to the modification shown in FIG. 13 (the multilayer capacitor C according to the modification shown in FIG. 14) has the internal connection conductor 31 shown in FIG. And the ESR is adjusted to a lower value than the multilayer capacitor C in which the internal connection conductor 33 shown in FIG. 8C is used as the internal connection conductor 33.

  In this modification, the connecting position of the straight line parts P1a, P1b and the line part P1c in the contour part P1 is different from the connecting position of the straight line parts P2a, P2b and the line part P2c in the contour part P2. Thereby, fine adjustment of ESR can be performed with higher accuracy.

  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.

The shape of the internal connection conductors 31 and 33 is not limited to the shape shown in FIGS. The shapes of the internal connection conductors 31 and 33 may be shapes as shown in FIGS. 15 and 16, for example. The internal connection conductors 31 and 33 shown in FIG. 15 are positions of the coupling portions 31d and 33d in the first direction (third direction), that is, the third side surface Le and the fourth side surface Lf of the coupling portions 31d and 33d. Is different from the internal connection conductors 31 and 33 shown in FIGS. In the internal connection conductors 31 and 33 shown in FIG. 16, the widths w _31d and w _33d of the connecting portions 31d and 33d are the widths w _31c and w _33c of the lead portions _31c and _33c and the width w _{31a of the} main conductor portions 31a and 33a. , W _33a is the same as the internal connection conductors 31 and 33 shown in FIGS. Also in the internal connection conductors 31 and 33 shown in FIG. 15, as shown in FIG. 7 to FIG. , P2b and the connection position of the line portion P2c), the value of ESR is finely adjusted to a desired value.

  The curvatures of the line portions P1c and P2c are not limited to the curvatures shown in FIGS. 7 to 14 and are set according to a desired value of ESR. Further, the shape of the line portions P1c and P2c is not limited to a curved shape, and may be a straight shape. Even in this case, the line portion P1c extends in a direction away from the direction in which the straight line portions P1a and P1b extend to connect the straight line portion P1a and the straight line portion P1b, and the line portion P2c extends in the straight line portions P2a and P2b, respectively. It extends in a direction deviating from the direction, and connects the straight portion P2a and the straight portion P2b.

  Although the multilayer capacitor C according to the present embodiment and the modification includes the pair of ESR control units 13 and 15, the present invention is not limited to this. The multilayer capacitor C may include only one of the pair of ESR controllers 13 and 15.

  DESCRIPTION OF SYMBOLS 1, 2 ... Terminal electrode, 3, 4 ... External connection conductor, 7 ... Dielectric layer, 11 ... Electrostatic capacity part, 13 ... Equivalent series resistance (ESR) control part, 21, 23 ... Internal electrode, 31, 33 ... Internal connection conductors, 35, 37 ... internal electrodes, C ... multilayer capacitors, L ... element bodies, P1, P2 ... contour portions, P1a, P1b, P2a, P2b ... straight portions, P1c, P2c ... line portions.

Claims (1)

An element body in which a plurality of dielectric layers are laminated;
A first terminal electrode disposed on a first side surface of the element body;
A second terminal electrode disposed on a second side surface facing the first side surface of the element body;
A first outer connecting conductor disposed on the third side surface of the element body;
A second external connection conductor disposed on a fourth side facing the third side of the element body;
A first internal electrode drawn to the third side surface and connected to the first external connection conductor; and a second internal electrode drawn to the fourth side surface and connected to the second external connection conductor. A capacitance section;
A first internal connection conductor which is pulled out to the first side surface and connected to the first terminal electrode and is pulled out to the third side surface and connected to the first external connection conductor; and is pulled out to the second side surface. An equivalent series resistance control unit having a second internal connection conductor connected to the second terminal electrode and pulled out to the fourth side surface and connected to the second external connection conductor,
The first internal connection conductor includes a first main conductor portion, a first lead portion extending from the first main conductor portion toward the third side surface and connected to the first external connection conductor, and the first As a part of the contour located in the element body, including a second lead portion connected to one terminal electrode, and a first connecting portion for linking the first main conductor portion and the second lead portion. , Having a first contour portion facing the third side as seen from the stacking direction of the plurality of dielectrics,
The second internal connection conductor includes a second main conductor portion, a third lead portion extending from the second main conductor portion toward the fourth side surface and connected to the second external connection conductor; As a part of the contour located in the element body, including a fourth lead portion connected to the two-terminal electrode, a second connecting portion for connecting the second main conductor portion and the fourth lead portion. , Having a second contour portion facing the fourth side as seen from the stacking direction,
The first contour portion is
A first linear portion that extends in a first facing direction between the first side surface and the second side surface and is an outline of the first connecting portion;
Extending in the second opposing direction of the third side surface and the fourth side surface, and a second straight line portion that is an outline of the first main conductor portion;
Connecting the first straight line part and the second straight line part, including a first line part that is an outline of a corner formed by the first connection part and the first main conductor part,
The second contour portion is
A third linear portion extending in the first opposing direction and being an outline of the second connecting portion;
A fourth linear portion extending in the second opposing direction and being the contour of the second main conductor portion;
Connecting the third straight line part and the fourth straight line part, and including a second line part that is an outline of a corner formed by the second connection part and the second main conductor part,
The first and second line portions are curved;
The curvature of the first line portion and the curvature of the second line portion are different, the connection position of the first and second straight line portions and the first line portion in the first contour portion, and the second contour portion. A multilayer capacitor, wherein the third and fourth straight line portions and the second line portion are connected at different positions.

Images