WO2016121745A1 - コンデンサおよびモジュール - Google Patents
コンデンサおよびモジュール Download PDFInfo
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- WO2016121745A1 WO2016121745A1 PCT/JP2016/052153 JP2016052153W WO2016121745A1 WO 2016121745 A1 WO2016121745 A1 WO 2016121745A1 JP 2016052153 W JP2016052153 W JP 2016052153W WO 2016121745 A1 WO2016121745 A1 WO 2016121745A1
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- WIPO (PCT)
- Prior art keywords
- capacitor
- pores
- cover portion
- dielectric
- outer layer
- Prior art date
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Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/30—Stacked capacitors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/005—Electrodes
- H01G4/012—Form of non-self-supporting electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/018—Dielectrics
- H01G4/06—Solid dielectrics
- H01G4/08—Inorganic dielectrics
- H01G4/12—Ceramic dielectrics
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/018—Dielectrics
- H01G4/06—Solid dielectrics
- H01G4/08—Inorganic dielectrics
- H01G4/12—Ceramic dielectrics
- H01G4/1209—Ceramic dielectrics characterised by the ceramic dielectric material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/224—Housing; Encapsulation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/228—Terminals
- H01G4/232—Terminals electrically connecting two or more layers of a stacked or rolled capacitor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/228—Terminals
- H01G4/248—Terminals the terminals embracing or surrounding the capacitive element, e.g. caps
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/18—Printed circuits structurally associated with non-printed electric components
- H05K1/181—Printed circuits structurally associated with non-printed electric components associated with surface mounted components
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10007—Types of components
- H05K2201/10015—Non-printed capacitor
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
- H05K3/341—Surface mounted components
- H05K3/3431—Leadless components
- H05K3/3442—Leadless components having edge contacts, e.g. leadless chip capacitors, chip carriers
Definitions
- This disclosure relates to a capacitor and a module on which the capacitor is mounted.
- Capacitors are used in many electronic devices because they have a function of controlling current and voltage in an electronic circuit or a function as a storage battery.
- capacitors examples include multilayer ceramic capacitors, film capacitors, aluminum electrolytic capacitors, and tantalum capacitors.
- multilayer ceramic capacitors are becoming smaller while maintaining high capacitance compared to other capacitors, and there is a tendency for demand for small electronic devices such as mobile phones to increase. is there.
- FIG. 9A is a perspective view schematically showing a general multilayer ceramic capacitor
- FIG. 9B is a cross-sectional view taken along the line AA in FIG. 9A
- FIG. It is B line sectional drawing.
- the multilayer ceramic capacitor 100 is composed of a capacitor body 101 and external electrodes 103 provided at both ends of the capacitor body 101.
- the multilayer ceramic capacitor is referred to as a capacitor.
- the capacitor body 101 includes a dielectric part 109 in which ceramic layers 105 and internal electrode layers 107 are alternately stacked, and a cover part 111 provided around the dielectric part 109.
- An object of the present invention is to provide a capacitor capable of suppressing the occurrence of delamination and a highly reliable module using the capacitor.
- the capacitor of the present disclosure includes a dielectric portion in which ceramic layers and internal electrode layers are alternately stacked, and a cover portion provided around the dielectric portion.
- the cover portion has pores, and a portion of the cover portion that is positioned in a direction perpendicular to the stacking direction of the ceramic layer and the internal electrode layer is a side cover portion.
- the dielectric portion side region is separated from the central region and the surface side region. There are a large number of pores.
- the module of the present disclosure is a module in which a capacitor is mounted on the surface of a wiring board, and the capacitor is the above-described capacitor.
- the capacitor and module of the present disclosure it is possible to obtain a capacitor in which delamination hardly occurs and a highly reliable module.
- FIG. (A) is a perspective view schematically showing a first embodiment of the capacitor of the present disclosure, (b) is a cross-sectional view taken along the line AA of (a), and (c) is a cross-sectional view of B of (a).
- FIG. (D) is the schematic sectional drawing which expanded the cover part vicinity (A part) in (b).
- (A) is a perspective view schematically showing the capacitor of the second embodiment, (b) is a cross-sectional view taken along the line AA of (a), and (c) is a line BB of (a). It is sectional drawing.
- FIG. 2 is a perspective view schematically showing a part of a module in which a capacitor is mounted as an example of an electronic component on the surface of a wiring board
- (b) is a cross-sectional view taken along line AA in (a)
- (c) is 2A is a sectional view taken along line BB in FIG.
- (A) is a perspective view schematically showing the capacitor of the third embodiment
- (b) is a cross-sectional view taken along the line AA of (a)
- (c) is a line BB of (a). It is sectional drawing.
- (A) is a perspective view schematically showing a capacitor of a fourth embodiment, (b) is a cross-sectional view taken along line AA in (a), and (c) is a line BB in (a). It is sectional drawing.
- (A) is a perspective view schematically showing a capacitor of a fifth embodiment, (b) is a cross-sectional view taken along the line AA of (a), and (c) is a line BB of (a). It is sectional drawing.
- (A) is a perspective view schematically showing a capacitor according to a sixth embodiment, (b) is a sectional view taken along line AA in (a), and (c) is a line BB in (a). It is sectional drawing.
- FIG. 1 It is a schematic diagram which shows the manufacturing method of the capacitor
- A is a perspective view schematically showing a conventional multilayer ceramic capacitor
- (b) is a sectional view taken along line AA in (a)
- (c) is a sectional view taken along line BB in (a).
- FIG. 1 is a perspective view schematically showing a conventional multilayer ceramic capacitor
- (b) is a sectional view taken along line AA in (a)
- (c) is a sectional view taken along line BB in (a).
- FIG. 1A is a perspective view schematically showing a first embodiment of a capacitor according to the present disclosure
- FIG. 1B is a cross-sectional view taken along line AA in FIG. 1A
- FIG. FIG. (D) is the schematic sectional drawing which expanded the cover part vicinity (A part) in (a).
- the capacitor has a capacitor body 1 and external electrodes 3 provided at opposite ends of the capacitor body 1.
- the capacitor body 1 has a dielectric part 9 and a cover part 11 provided around the dielectric part 9.
- the dielectric portion 9 is formed by alternately laminating ceramic layers 5 and internal electrode layers 7.
- the dielectric portion 9 is a portion that contributes to the expression of capacitance.
- the cover part 11 is a part that does not develop a capacitance.
- the cover portion 11 is formed of a porcelain containing the same main component as the ceramic layer 5, but has a composition different from that of the ceramic layer 5 as long as the capacitor satisfies a desired dielectric property and mechanical property. It doesn't matter.
- the side cover portion 11A located in the direction perpendicular to the stacking direction of the ceramic layer 5 and the internal electrode layer 7 in the cover portion 11 is hereinafter referred to as a side cover portion 11A.
- cover portions 11 provided on the upper surface side and the lower surface side of the dielectric portion 9 are referred to as an outer layer cover portion 11B.
- pores 12 in the cover part 11 constituting the capacitor body 1 There are pores 12 in the cover part 11 constituting the capacitor body 1.
- the pores 12 are defined as having a diameter of 0.1 ⁇ m or more.
- the diameter of the pores 12 is the opening diameter of the pores 12 in the cross section of the cover portion 11.
- the pores 12 can be confirmed, for example, by exhibiting a color different from the porcelain of the cover portion 11 when an area as shown in FIG. 1D is observed with an electron microscope. Observation with an electron microscope is performed at a magnification of 2000 to 5000, for example.
- Each region 3 equal parts in the direction of the side cover portions 11A width W A is the dielectric portion 9 side, the dielectric portion side region 11Aa, a central region 11Ab and the surface side region 11Ac.
- the respective widths of the dielectric portion side region 11Aa, the central region 11Ab, and the surface side region 11Ac are represented by symbols Wa, Wb, and Wc.
- the dielectric portion side region 11Aa has a larger number of pores 12 than the central region 11Ab and the surface side region 11Ac.
- having a difference in the number of pores 12 means that the number of pores 12 in the dielectric portion side region 11Aa is compared with the number of pores 12 in the central region 11Ab and the number of pores 12 in the surface side region 11Ac. Sometimes it is 1.2 times or more.
- the ceramic layer 105 and the internal electrode layer 107 are further thinned, and in the capacitor in which the area ratio and the number of laminated layers of the internal electrode layer 107 are increased, delamination still occurs in the cover portion 111. is there.
- the number of pores 12 in the dielectric portion side region 11Aa is larger than the number of pores 12 in each of the center region 11Ab and the surface side region 11Ac.
- the portions 11A the rigidity of the region close to the dielectric portion 9 is low.
- the side cover portion 11A is affected by the distortion that the dielectric portion 9 receives.
- the effect which can be relieved with the whole cover part 11A can further be heightened.
- this capacitor has high humidity resistance because the surface side region 11Ac of the side cover portion 11A is dense.
- the number of pores 12 is determined by observing the cross section of the capacitor with a scanning electron microscope and analyzing the photographed photograph.
- a photograph of a predetermined region as shown in FIG. 1D is taken.
- the side cover portions 11A in the direction of the width W A from the photo dielectric portion side area 11Aa, defining a central region 11Ab and the surface side region 11Ac counts the number of pores 12 in the respective regions And ask.
- the area where the pores 12 are counted is set at the same height direction in the stacking direction. This is the position shown as interval t in FIG. In this case, the pores 12 placed on the line drawn to distinguish each region are not counted.
- the average diameter D 1 of the pores 12 in the dielectric portion side region 11Aa is at greater than the average diameter D 2 of the pores 12 in the surface side region 11Ac further reduce the probability that delamination occurs in the capacitor be able to.
- the capacitor according to the present disclosure may further include the following configuration in addition to the configuration of the first embodiment described above.
- FIG. 2A is a perspective view schematically showing the capacitor of the second embodiment
- FIG. 2B is a cross-sectional view taken along the line AA in FIG. 2A
- FIG. It is B line sectional drawing.
- FIG. 3 is a perspective view schematically showing a part of a module in which a capacitor is mounted on the surface of a wiring board.
- FIG. 3B is a cross-sectional view taken along the line AA in FIG. It is a BB line sectional view of a).
- the upper layer when the porosity of the side cover portion 11A constituting the capacitor body 1 divides the dielectric portion 9 into two equal parts in the stacking direction. Different on the side and lower side.
- the number of pores 12 existing inside the side cover portion 11A is biased to one side when the dielectric portion 9 is viewed in the stacking direction.
- the side cover portion 11A constituting the capacitor body 1 has a different number of pores 12 in the stacking direction in addition to the structure of the first embodiment described above, the pores present inside the side cover portion 11A. 12, when one side of the capacitor in the stacking direction is constrained and stress is generated inside the capacitor, the stress can be relaxed.
- the capacitor 20 when the capacitor 20 is fixed to the surface of the wiring board 21 by a bonding member 23 such as solder as shown in FIGS. 3A, 3B, and 3C, the capacitor 20 is restrained by the bonding member 23. Will be.
- the binding force is large on the wiring board 21 side between the wiring board 21 side and the opposite side in the stacking direction of the capacitors 20.
- the capacitor 20 may crack.
- the pores 12 present in the side cover portion 11A are biased.
- the capacitor 20 is mounted on the wiring substrate 21, the capacitor 20 is mounted so that the side with the larger number of pores 12 is close to the surface of the wiring substrate 21.
- the stress generated in the capacitor 20 is applied to the side cover portion 11A on the wiring board 21 side. It can be relieved by the pores 12 existing inside.
- the capacitor 30 according to the third embodiment and the capacitor 40 according to the fourth embodiment described below are obtained by adding the following configurations to the configurations of the first embodiment or the second embodiment described above. It is.
- FIG. 4A is a perspective view schematically showing the capacitor of the third embodiment
- FIG. 4B is a cross-sectional view taken along the line AA in FIG. 4A
- FIG. It is B line sectional drawing.
- the capacitor 30 of the third embodiment is based on the configuration of the first embodiment. As shown in FIGS. 3B and 3C, the capacitor 30 includes two cover portions located on the upper surface side and the lower surface side in the stacking direction of the dielectric portion 9 in the cover portion 11, respectively, as the outer layer cover portion 11Ba, 11Bb, the number of pores 12 or the porosity is different between the two outer layer cover portions 11Ba and 11Bb. Hereinafter, it may be expressed only by the number of pores 12.
- the number or the porosity of the outer layer cover portion 11 ⁇ / b> B constituting the capacitor body 1 is different from the upper surface side and the lower surface side of the dielectric portion 9. If the outer layer cover portions 11Ba and 11b having a high porosity or a large number of pores 12 are arranged on the wiring board 21 side among the outer layer cover portions 11Ba and 11Bb. Even when one side is restrained and a stress is generated inside the capacitor 30, the stress can be reduced. As a result, the occurrence of cracks in the capacitor 30 can be suppressed.
- FIG. 5A is a perspective view schematically showing the capacitor of the fourth embodiment
- FIG. 5B is a sectional view taken along line AA in FIG. 5A
- FIG. It is B line sectional drawing.
- the capacitor 40 of the fourth embodiment is based on the configuration of the second embodiment. Also in the capacitor 20 shown in FIGS. 4B and 4C, the outer layer cover portions 11Ba and 11Bb located on the upper surface side and the lower surface side in the stacking direction of the dielectric portion 9 are the same as the outer layer cover portion 11Ba in the third embodiment described above. , 11Bb.
- the porosity or the number of pores 12 is different between the outer layer cover portions 11Ba and 11Bb located on the upper surface side and the lower surface side of the dielectric portion 9 in the stacking direction.
- the capacitor 50 of the fifth embodiment shown below is obtained by adding the following configuration to the configuration of the above-described fourth embodiment.
- FIG. 6A is a perspective view schematically showing the capacitor of the fifth embodiment
- FIG. 6B is a cross-sectional view taken along the line AA in FIG. 6A
- FIG. It is B line sectional drawing.
- the capacitor 50 according to the fifth embodiment includes the ceramic layer 5 having a thickness td different from that of the other ceramic layers 5 in the dielectric portion 9.
- a thick ceramic layer having a thickness td is denoted by reference numeral 5a
- a thin ceramic layer is denoted by reference numeral 5u.
- a thick ceramic layer 5a having a thickness td is arranged on the outer layer cover portion 11A side having a larger number of pores 12 or a higher porosity.
- the thin ceramic layer 5u having a thickness td is arranged on the outer layer cover portion 11A side having the smaller number of pores 12 or the lower porosity.
- the dielectric part 9 has a difference in mechanical characteristics due to physical properties such as a thermal expansion coefficient between the dielectric part 9 and the cover part 11 as the thickness of the ceramic layer 5 and the internal electrode layer 7 is reduced and the number of laminated layers is increased.
- the portion where the thickness td of the ceramic layer 5 is increased can bring the thermal expansion coefficient of the dielectric portion 9 closer to the thermal expansion coefficient of the cover portion 11 by the increase in the thickness td of the ceramic layer 5.
- the stress locally generated between the cover portion 11 and the dielectric portion 9 of the capacitor body 1 can be relaxed.
- the possibility of cracks occurring in the capacitor 50 can be reduced.
- the side cover portion 11A having a large number of pores 12 and the outer layer cover portion 11B side having a large number of pores 12 are provided.
- the internal electrode layer 7 is lower in continuity than the side electrode cover 11A having a small number of pores 12 located on the opposite side and the internal electrode layer 7 on the side of the outer cover portion 11B having a small number of pores 12,
- the thermal expansion coefficient of the dielectric portion 9 can be made closer to the thermal expansion coefficient of the cover portion 11 by the amount of the sparse internal electrode layer 7. Even in such a case, the stress locally generated between the cover portion 11 and the dielectric portion 9 of the capacitor body 1 can be relaxed. As a result, the possibility of cracks occurring in the capacitor 50 can be further reduced.
- the continuity of the internal electrode layer 7 means whether or not the effective area of the internal electrode layer 7 is high. When the effective area of the internal electrode layer 7 is high, the continuity of the internal electrode layer 7 is high.
- the continuity of the internal electrode layer 7 is, for example, a metal portion occupying per unit length of the internal electrode layer 7 exposed on the cross section of the dielectric portion 9 as shown in FIG. Determine the ratio of the length of
- FIG. 7A is a perspective view schematically showing the capacitor of the sixth embodiment
- FIG. 7B is a cross-sectional view taken along the line AA in FIG. 7A
- FIG. It is B line sectional drawing.
- the capacitor 60 of the sixth embodiment is obtained by adding the following configuration to the configuration of the fourth embodiment described above.
- the dimension W2 of the outer layer cover part 11Bb having a large number of pores or a high porosity has a dimension W2 of the outer layer cover part 11Ba located on the opposite side of the stacking direction with respect to the outer layer cover part 11Bb. It is larger than the dimension W1.
- the length of the outer layer cover portion 11B is a direction perpendicular to the direction in which the pair of external electrodes 3 are arranged and the direction in which the pair of external electrodes 3 are arranged, as shown in FIGS. It is desirable that at least one of them is large.
- the outer layer cover portions 11Ba and 11Bb arranged on the upper surface side and the lower surface side of the dielectric portion 9 have a high porosity or the number of the pores 12.
- the length of many outer layer cover portions 11Bb is larger than the outer layer cover portion 11Ba on the opposite side, even if a crack occurs in the outer layer cover portion 11Bb by the amount of the volume of the outer layer cover portion 11Bb, the failure due to the crack The degree can be reduced. As a result, the occurrence rate of defects due to failure can be reduced.
- the length of the outer layer cover portion 11B is set in the direction in which the pair of external electrodes 3 are disposed and in the direction in which the pair of external electrodes 3 are disposed. It is desirable that both directions perpendicular to each other are large.
- capacitors 30, 40, 50, 60 of the third to sixth embodiments are also soldered on the surface of the wiring board 21, as with the capacitor 20 of the second embodiment. In the case of being mounted by the joining member 23, the same effect is obtained.
- the material of the ceramic layer 5 and the cover portion 11 constituting these capacitors is at least one metal oxide selected from barium titanate, barium zirconate titanate, lead zirconate titanate, titanium dioxide, etc., or a composite oxide Things are preferred.
- the thermal expansion coefficient of these materials is preferably 9 ⁇ 10 ⁇ 6 to 11 ⁇ 10 ⁇ 6 / ° C.
- the internal electrode layer 7 As a material of the internal electrode layer 7, it is preferable to apply one kind of metal selected from nickel, copper, palladium and silver, or an alloy thereof.
- the thermal expansion coefficient of these metals is preferably 10 ⁇ 10 ⁇ 6 to 20 ⁇ 10 ⁇ 6 / ° C.
- the average thickness of the ceramic layer 5 is preferably 0.5 to 3 ⁇ m, and the average thickness of the internal electrode layer 7 is preferably 0.2 to 2 ⁇ m.
- the number of stacked internal electrode layers 7 in the dielectric portion 9 is 100 or more, and the thickness of the cover portion 11 is 0.01 to 0.1 when the thickness of the dielectric portion 9 in the stacking direction is 1. Is good.
- FIG. 8 is a schematic view showing a method for manufacturing a capacitor according to the present embodiment.
- FIGS. 8A and 8B are plan views of pattern sheets 27a and 27b that are alternately stacked.
- FIG. 8C is a plan view schematically showing a base laminate 31 formed by laminating pattern sheets 27a and 27b.
- FIG. 8C shows a watermarked state so that the positions of the internal electrode patterns 23 and the ceramic patterns 25 can be seen.
- FIG. 8D is a cross-sectional view schematically showing a base laminate 31 formed by laminating pattern sheets 27a and 27b.
- a rectangular shape is formed on the main surface of the ceramic green sheet 21 containing a dielectric powder mainly composed of barium titanate.
- Pattern sheets 27a and 27b are formed by forming a shaped internal electrode pattern 23 and a ceramic pattern 25 around the internal electrode pattern 23.
- a plurality of pattern sheets 27a and 27b are stacked to form a core laminate.
- a predetermined number of ceramic green sheets 21 on which no conductor pattern is formed are stacked on the upper surface side and the lower surface side of the core stacked body, and a plurality of stacked bodies 29 to be the capacitor body 1 are formed by performing pressure and heat treatment.
- a base laminate 31 is formed.
- the base laminate 31 is cut into a laminate 29 by cutting along the cutting line C shown in FIGS.
- a laser processing machine is used for cutting the laminate 29.
- the ceramic pattern 25 is heated by a laser processing machine and cut. Thereby, the content of the organic resin contained in the ceramic pattern 25 can be changed between the peripheral edge portion 25a of the ceramic pattern 25 near the cutting line C and the peripheral edge portion 23a of the internal electrode pattern 23 far from this.
- the ceramic particles constituting the ceramic pattern 25 are slightly sintered.
- the number of pores 12 can be changed between the peripheral portion 25a of the ceramic pattern 25 (the surface 11a of the cover portion 11) and the peripheral portion 23a (the dielectric portion 9) of the internal electrode pattern 23 far from the ceramic pattern 25. .
- the dielectric is changed from the surface side region 11Ac of the side cover portion 11A.
- the number of pores 12 is increased over the body part region 11Aa, and when the average diameter of the pores 12 in the dielectric part region 11Aa is larger than the average diameter of the pores 12 in the surface region 11Ac, etc.
- the output of the laser processing machine is changed.
- the mother layer stack 31 is cut when the mother layer stack 31 is cut by a laser processing machine. Water is wiped on the spray from the upper surface side of the body 31 and cut.
- the barium (Ba) component contained in the ceramic green sheet 21 is eluted, so that the ceramic green sheet 21 is locally near the surface or near the cutting portion. It becomes rich in titanium (Ti).
- the portion rich in titanium is harder to sinter than the portion having a higher proportion of the barium component than this, and the pores 12 are increased in the outer layer cover portion 11B.
- the capacitor body 1 is produced by firing the produced laminate 29 under predetermined conditions.
- the length of the planar direction of the outer layer cover part 11B on the upper surface side and the lower surface side of the dielectric part 9 it is obtained by the above-described method of wiping the base laminate 31 on the spray and cutting it.
- the maximum temperature when firing the laminated body 29 is changed.
- the continuity of the internal electrode layer 7 also changes simultaneously.
- the external electrode 3 is formed on the end portion including the end face where the internal electrode layer 7 of the capacitor body 1 obtained by firing is exposed, and a nickel plating film and a tin plating film are formed as necessary.
- the capacitors of the first to sixth embodiments can be obtained.
- the effect of the present invention was confirmed by specifically producing a multilayer ceramic capacitor.
- dielectric powders were prepared as materials for the ceramic layer and the cover part.
- the dielectric powder that has been wet-mixed is put into a mixed solvent of toluene and alcohol in which polyvinyl butyral resin is dissolved, and wet-mixed using a zirconia ball having a diameter of 1 mm to prepare a ceramic slurry.
- a ceramic green sheet having an average thickness of 1 ⁇ m was produced.
- Sample No. A ceramic green sheet having a thickness of 1.2 ⁇ m was also produced for the capacitor No. 8.
- the conductor paste for forming the internal electrode pattern is 30% by mass of organic vehicle consisting of 20% by mass of barium titanate powder as a co-material, 5% by mass of ethyl cellulose and 95% by mass of octyl alcohol with respect to 45% by mass of Ni powder. % was kneaded with three rolls.
- the dielectric powder used for the ceramic green sheet was applied as the ceramic paste for the ceramic pattern.
- this base laminate was cut into a predetermined size using a laser processing machine to form a laminate.
- Sample No. in Table 1 No. 1 used a cutter blade for cutting.
- Sample No. For 2-4 a laser processing machine was used.
- Sample No. 3 is sample No. 2 times 0.9, sample no. Sample No. 4 It cut
- Sample No. Samples Nos. 5 to 9 are sample Nos. It produced based on the conditions of 2.
- Sample No. 5, 7 and 8 are sample Nos. When cutting was performed to the middle in the thickness direction under the condition 6, cutting was performed by gradually reducing the output of the laser processing machine to 0.1 times.
- the prepared laminate was degreased in the air, and the maximum temperature was set to 1280 ° C. in a hydrogen-nitrogen mixed gas atmosphere at an oxygen partial pressure of 10 ⁇ 8 Pa for 2 hours. Firing was performed to produce a capacitor body.
- Sample No. No. 9 was produced by setting the firing temperature to a temperature (1300 ° C.) 20 ° C. higher than the other samples. In this sample, the continuity of the internal electrode layers changed in the stacking direction of the dielectric portions. The internal electrode layer on the side of the outer layer cover portion on the side with a large number of pores was lower in continuity than the outer layer cover portion side on the side opposite to the side with a small number of pores.
- the size of the capacitor body produced was equivalent to 1005 type, and the size was approximately 0.95 mm ⁇ 0.48 mm ⁇ 0.48 mm.
- the average thickness of the ceramic layer was 0.7 ⁇ m, and the average thickness of one of the internal electrode layers of the dielectric portion was 0.6 ⁇ m.
- the average width of the side cover part and the average thickness of the outer layer cover part were 20 ⁇ m.
- the average thickness of one layer of these ceramic layers and internal electrode layers is that both end portions (inside of about 1 ⁇ m from the end) of the internal electrode layers in the upper layer, middle layer, and lower layer in the stacking direction of the cross section of the dielectric portion constituting the multilayer ceramic capacitor and The central part (9 places in total) was measured and determined from the average value.
- a copper paste was applied to the end of the capacitor body where the internal electrode layer was exposed, and heated at about 800 ° C. to form an external electrode.
- a Ni plating film and an Sn plating film were sequentially formed by electrolytic plating to produce a multilayer ceramic capacitor.
- the number of pores existing in the dielectric part and the cover part and the average diameter of the pores were determined from a cross-sectional photograph (5000 times) taken with a scanning electron microscope. At this time, as shown in FIG. 1D, the side cover portion was equally divided into three in the width direction, and the dielectric portion side region, the central region, and the surface side region were set as the observation region. The area of each region was 100 ⁇ m 2 . The pores present on the line dividing each region were excluded from the count. For the average diameter of the pores, a circle with about 30 pores in the center of each region was drawn, the area of each pore was determined by image analysis, and the diameter determined from each area was associated.
- the occurrence rate of delamination was determined by immersing a multilayer ceramic capacitor sample in a solder bath heated to 350 ° C. for about 1 second and then evaluating the appearance.
- the number of samples was 300.
- the moisture resistance load test was obtained by measuring the insulation resistance after being left for 100 hours at 65 ° C., 65% RH and an applied voltage of 6.3 V. Sample No. The samples 5 to 8 were also subjected to a moisture resistance load test under the condition that the temperature was set to 85 ° C. As shown in Table 1, the number of samples was 300, and those having an insulation resistance of 10 6 ⁇ or less were regarded as defective.
- the dielectric breakdown voltage was measured using an insulation resistance meter. The number of samples was 100.
- the ratio of the width of the outer layer cover portion was determined from the values measured using a digital microscope capable of displaying the scales in the directions shown in FIGS.
- the produced samples had the same W1 / W2 ratio and W3 / W4 ratio.
- the wiring board As the wiring board, a wiring board in which a wiring pattern was formed on the surface of an FR-4 board was used.
- the wiring pattern was obtained by applying solder plating to the surface of the copper foil pattern.
- the capacitor was mounted on the wiring pattern with solder.
- the thermal shock test was performed under the same conditions as those for evaluating the occurrence rate of delamination.
- the number of samples was 30 for each sample.
- the dielectric part side region of the side cover part had more pores than the central region and the surface side region.
- the incidence of delamination was 1 or less out of 300.
- the average diameter of the pores present in the side cover portion was larger than the average diameter of the pores present in the central region and the surface side region.
- sample no. In Nos. 2 to 9 the number of cracks generated was 2 or less in 30 in the thermal shock test conducted after mounting on the wiring board.
- sample no. In No. 1 the occurrence rate of delamination was 12 out of 300, and the failure occurrence rate in the moisture resistance load test was 4 out of 300.
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Abstract
Description
3・・・・・・外部電極
5・・・・・・誘電体セラミック層
7・・・・・・内部電極層
9・・・・・・誘電体部
11・・・・・カバー部
11a・・・・カバー部の表面
11A・・・・側面カバー部
11Aa・・・誘電体部側領域
11Ab・・・中央領域
11Ac・・・表面側領域
11B・・・・外層カバー部
12・・・・・気孔
20、30、40、50、60・・・コンデンサ
21・・・・・配線基板
Claims (10)
- セラミック層と内部電極層とが交互に積層された誘電体部と、該誘電体部の周囲に設けられたカバー部とを備えているコンデンサであって、前記カバー部が気孔を有するとともに、前記カバー部のうち、前記セラミック層と前記内部電極層との積層方向に対して垂直な方向に位置する部位を側面カバー部とし、該側面カバー部を幅方向に誘電体部側領域、中央領域および表面側領域と3等分したときに、前記誘電体部側領域は前記中央領域および前記表面側領域よりも気孔の数が多いことを特徴とするコンデンサ。
- 前記気孔の数は、前記表面側領域から前記誘電体部側領域に向けて次第に多くなっていることを特徴とする請求項1に記載のコンデンサ。
- 前記気孔の平均径は、前記誘電体部側領域が前記表面側領域よりも大きいことを特徴とする請求項1または2に記載のコンデンサ。
- 前記側面カバー部における前記気孔の数は、前記誘電体部を積層方向に2等分したときの上層側および下層側で異なっていることを特徴とする請求項1乃至3のうちいずれかに記載のコンデンサ。
- 前記カバー部のうち、前記誘電体部の積層方向の上面側および下面側に位置する2つのカバー部をそれぞれ外層カバー部としたときに、2つの前記外層カバー部の前記気孔の数は異なっており、前記気孔の数の多い方の前記外層カバー部が前記気孔の数の多い方の前記側面カバー部側に配置されていることを特徴とする請求項4に記載のコンデンサ。
- 前記気孔の数の多い方の前記外層カバー部側に配置されている前記セラミック層は、前記気孔の数の少ない方の前記外層カバー部側に配置されている前記セラミック層よりも厚みが厚いことを特徴とする請求項5に記載のコンデンサ。
- 前記気孔の数の多い方の前記外層カバー部側に配置されている前記内部電極層は、前記気孔の数の少ない方の前記外層カバー部側に配置されている前記内部電極層よりも連続性が低いことを特徴とする請求項5または6に記載のコンデンサ。
- 前記セラミック層および前記内部電極層の積層方向に対して垂直な方向に、対向した一対の外部電極を有しており、前記気孔の数の多い方の前記外層カバー部は、前記外部電極が対向した方向の長さが、前記気孔の数の少ない方の前記外層カバー部よりも長さが長いことを特徴とする請求項5乃至7のうちいずれかに記載のコンデンサ。
- 前記気孔の数の多い方の前記外層カバー部は、前記外部電極が対向した方向に対して垂直な方向の長さが、前記気孔の数の少ない方の前記外層カバー部よりも長さが長いことを特徴とする請求項5乃至8のうちいずれかに記載のコンデンサ。
- 配線基板の表面上にコンデンサが実装されたモジュールであって、前記コンデンサが請求項1乃至9のうちいずれかに記載のコンデンサであることを特徴とするモジュール。
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JP7069935B2 (ja) | 2018-03-27 | 2022-05-18 | Tdk株式会社 | 積層セラミック電子部品 |
US11387044B2 (en) * | 2019-08-23 | 2022-07-12 | Samsung Electro-Mechanics Co., Ltd. | Multi-layered ceramic capacitor and method of manufacturing the same |
US11581145B2 (en) | 2019-08-23 | 2023-02-14 | Samsung Electro-Mechanics Co., Ltd. | Multi-layered ceramic capacitor and method of manufacturing the same |
US11763991B2 (en) | 2019-08-23 | 2023-09-19 | Samsung Electro-Mechanics Co., Ltd. | Multi-layered ceramic capacitor and method of manufacturing the same |
WO2024057786A1 (ja) * | 2022-09-14 | 2024-03-21 | 株式会社村田製作所 | 電子部品 |
WO2024224921A1 (ja) * | 2023-04-25 | 2024-10-31 | 株式会社村田製作所 | 積層セラミックコンデンサ |
WO2024224920A1 (ja) * | 2023-04-25 | 2024-10-31 | 株式会社村田製作所 | 積層セラミックコンデンサ |
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JPWO2016121745A1 (ja) | 2017-11-24 |
US20180012702A1 (en) | 2018-01-11 |
JP6216085B2 (ja) | 2017-10-18 |
CN107210131A (zh) | 2017-09-26 |
US10014112B2 (en) | 2018-07-03 |
CN107210131B (zh) | 2018-09-25 |
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