JP2011066308A - Ceramic electronic component and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ceramic electronic component that has no deterioration in electric characteristics and can prevent damages to an element body and has an improved bonding strength between a terminal electrode and the element body, by an easy and simple method. <P>SOLUTION: A multilayer ceramic capacitor 2 has a substantially rectangular parallelepiped element body 4 having opposing edges 40 and 42, opposing first side faces 44 and 46 nearly perpendicular to the edges 40 and 42, and opposing second side faces 48 and 50 nearly perpendicular to the edges 40 and 42 and the first side faces 44 and 46. A pair of terminal electrodes 6 and 8 are so formed as to cover from the edges 40 and 42 of the element body 4 to parts of the first and second side faces near the edges. In the pair of first side faces 44 and 46, a plurality of first grooves 60 extending at a predetermined angle θ of less than 90° with respect to the second side faces 48 and 50 are so formed as to make their ways into connections between the terminal electrodes 6 and 8 and the first side faces 44 and 46. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a structure of a ceramic electronic component such as a multilayer ceramic capacitor and a manufacturing method thereof.

  In ceramic electronic components such as multilayer ceramic capacitors, internal electrode layers and ceramic layers are alternately stacked inside the element body, and terminal electrodes are formed on both end faces of the element body where the internal electrode layers are exposed. is there. In order to increase the bonding strength between the end face of the element body and the terminal electrode, it has been proposed to form a groove in the end face of the element body (Patent Document 1).

  However, if a groove is formed in the end face of the element body before sintering the element body, the internal electrode drawn out to the end face is oxidized when the element body is annealed after firing. There are problems such as deterioration of characteristics.

  In addition, forming a groove by machining or laser processing after sintering the element body may cause damage to the element body or a complicated process because the element body becomes brittle after sintering. It is not preferable.

JP 2000-277381 A

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a ceramic that does not cause deterioration of electrical characteristics, prevents damage to the element body, and improves the bonding strength between the terminal electrode and the element body. It is to provide an electronic component by a simple method.

In order to achieve the above object, a ceramic electronic component according to the present invention comprises:
A substantially rectangular parallelepiped element body having an end surface facing each other, a first side surface substantially perpendicular to the end surface and facing each other, and a second side surface substantially perpendicular to the end surface and the first side surface and facing each other. When,
A ceramic electronic component having a pair of terminal electrodes formed on the end face so as to cover the end faces of the first and second side faces from the end face of the element body,
A plurality of first grooves extending at a predetermined angle of less than 90 degrees with respect to the second side surface enter the connection portion between the terminal electrode and the first side surface in the pair of first side surfaces. Is formed.

  In the ceramic electronic component according to the present invention, each terminal electrode covers from the end surface of the element body to the vicinity of the end surfaces of the first side surface and the second side surface. In addition, a plurality of first grooves extending at a predetermined angle of less than 90 degrees with respect to the second side surface are formed so as to enter the connection portion between the terminal electrode and the first side surface. Therefore, the terminal electrode is firmly bonded to the end surface of the element body.

  In addition, since the first groove extends at a predetermined angle of less than 90 degrees with respect to the second side surface, bubbles that enter the bonding interface between the terminal electrode and the element body during the manufacturing process are It is easy to come out, and there is little possibility of causing explosion when mounting parts.

  In the first groove having an angle of 90 degrees with respect to the second side surface, bubbles that have entered the bonding interface between the terminal electrode and the element body are difficult to escape through the first groove. Further, in the first groove parallel to the second side surface, bubbles that have entered the bonding interface between the terminal electrode and the element body can easily escape through the first groove, but the bonding strength between the terminal electrode and the element body is weakened. There is a tendency.

  Preferably, a second groove is formed on each of the end faces, and the depth of the second groove is smaller than the depth of the first groove. Or it is preferable not to form a groove | channel actively in the said end surface. For example, if a groove is formed in the end face of the element body before sintering the element body, the internal electrode drawn out to the end face is oxidized when the element body is annealed after firing. There is a risk of deterioration. Therefore, it is preferable not to form the second groove on the end face of the element body as much as possible. Even if formed, the depth of the second groove is preferably smaller than the depth of the first groove. Preferably, the depth of the second groove is less than 2 μm.

  Preferably, the depth of the first groove is 2 to 10 μm. When the groove depth is such, the bonding strength between the element body and the terminal electrode is improved.

  Preferably, three or more first grooves are formed on each first side surface. Increasing the number of first grooves present at the bonding interface between the terminal electrode and the first side surface improves the bonding strength between the element body and the terminal electrode.

  Preferably, the predetermined angle of the first groove is 10 degrees or more. In such a range, the bonding strength between the element body and the terminal electrode can be improved, and explosion at the time of mounting can be prevented.

  Preferably, the pair of second side surfaces are flat without grooves such as the first groove and / or the second groove, and one of the pair of second side surfaces is a mounting surface. Since no groove is formed on the mounting surface, there is little risk of migration of solder components during mounting, and there is little risk of short circuit failure occurring on the mounting surface of the element body. If a groove is formed on the mounting surface, solder flux enters the groove during mounting and it is difficult to remove it by cleaning. If the flux remains, migration of solder components may occur.

  In addition, no grooves are formed on the opposite side of the mounting surface of the pair of second side surfaces, and the surface is flat and smooth. Is easy. If a groove is formed on the surface opposite to the mounting surface, air flows through the groove, and the suction by the suction nozzle tends to be incomplete, and a mounting error tends to occur.

A method for producing a ceramic electronic component according to the present invention includes:
A step of laminating green sheets together with the internal electrode pattern layer to form a laminate,
Cutting the laminate into a matrix to form a substantially rectangular parallelepiped green chip;
Firing the green chip to obtain an element body;
Forming a terminal electrode on each of a pair of opposed end faces of the element body,
Before forming the terminal electrode, the two first side surfaces facing the end surface of the element body so as to be substantially orthogonal to each other have a predetermined angle of less than 90 degrees with respect to the remaining two second side surfaces. A plurality of extending first grooves are formed.

  According to this manufacturing method, the ceramic electronic component according to the present invention can be easily manufactured.

  Preferably, the first groove is formed at the same time when the stacked body is cut into a matrix shape to form a substantially rectangular parallelepiped green chip. In that case, the first groove can be formed without requiring a special process for forming the first groove. It should be noted that forming the grooves by machining or laser processing after the element body is sintered may cause the element body to be damaged after the sintering, and the process is complicated. It is not preferable.

  Preferably, the first groove is formed at the same time when the laminated body is cut with a rotary cutting blade to form a substantially rectangular parallelepiped green chip. By using the rotary cutting blade, the first groove having a predetermined angle can be easily formed. Further, various conditions such as the rotational speed of the rotary cutting blade used for cutting in the first direction may be different from those of the rotary cutting blade used for cutting in the second direction perpendicular to the first direction. Good. By adopting such means, the first groove is formed on the first side surface of the element body, and the second groove is formed on the end surface, or no groove is formed on the end surface. Is also possible.

  For example, the thinner the cutting blade, the deeper the groove formed on the cut surface (the first side surface or the end surface) during cutting, and the higher the rotational speed, the deeper the groove. It is in. Further, by changing the cutting speed, the number of grooves formed on the cut surface can be changed. Alternatively, the groove angle can be changed by changing the outer diameter of the rotary cutting blade. The depth of the groove can also be adjusted by changing the cutting edge angle or shape of the cutting blade.

FIG. 1 is a schematic cross-sectional view of a multilayer ceramic capacitor according to an embodiment of the present invention. FIG. 2 is a perspective view of a green multilayer body obtained in the process of manufacturing the multilayer ceramic capacitor shown in FIG. 3 is a cross-sectional view of a main part of the green laminate shown in FIG. FIG. 4 is a perspective view showing a cutting process. FIG. 5 is a schematic view showing a polishing process. 6A is a schematic perspective view of the multilayer ceramic capacitor shown in FIG. 1, and FIGS. 6B and 6C are partial cross-sectional side views showing the relationship between terminal electrodes and grooves. 7A and 7B are partial cross-sectional side views showing the relationship between terminal electrodes and grooves in a multilayer ceramic capacitor according to a comparative example of the present invention.

Hereinafter, the present invention will be described based on embodiments shown in the drawings.
First, an overall configuration of a multilayer ceramic capacitor will be described as an embodiment of a ceramic electronic component according to an embodiment of the present invention.

  As shown in FIG. 1, the multilayer ceramic capacitor 2 according to the present embodiment includes an element body 4, a first terminal electrode 6, and a second terminal electrode 8. The element body 4 includes a first internal electrode layer 12 and a second internal electrode layer 13, and the internal electrode layers 12 and 13 are interposed between the first inner dielectric layer 10 and the second inner dielectric layer 11. They are stacked alternately.

  The element body 4 has outer dielectric layers 14 on both end faces in the stacking direction. One of the first internal electrode layers 12 that are alternately stacked is electrically connected to the inside of the first terminal electrode 6 that is formed outside the first end of the element body 4. The other second internal electrode layer 13 stacked alternately is electrically connected to the inside of the second terminal electrode 8 formed outside the second end of the element body 4.

  The materials of the first and second inner dielectric layers 10 and 11 and the outer dielectric layer 14 are not particularly limited, and are made of a dielectric material such as calcium titanate, strontium titanate and / or barium titanate. . The thickness of each inner dielectric layer 10, 11 is not particularly limited, but is generally 1 μm to several tens of μm. Further, the thickness of the outer layer portion composed of the outer dielectric layer 14 is not particularly limited, but is preferably in the range of 10 to 200 μm.

  The material of the terminal electrodes 6 and 8 is not particularly limited, but usually at least one of Ni, Pd, Ag, Au, Cu, Pt, Rh, Ru, Ir, or an alloy thereof can be used. Usually, Cu, Cu alloy, Ni, Ni alloy, etc., Ag, Ag—Pd alloy, etc. are used. The thickness of the terminal electrodes 6 and 8 is not particularly limited, but is usually about 10 to 50 μm.

  The shape and size of the multilayer ceramic capacitor 2 may be appropriately determined according to the purpose and application. When the multilayer ceramic capacitor 2 has a rectangular parallelepiped shape, it is usually about vertical (0.2 to 5.7 mm) × horizontal (0.1 to 5.0 mm) × thickness (0.1 to 3.2 mm).

  In the present embodiment, as shown in FIG. 6A, the element body 4 has a substantially rectangular parallelepiped shape, and is substantially perpendicular to the end faces 40 and 42 facing each other in the X-axis direction. First side surfaces 44 and 46 facing each other in the Y-axis direction, and second side surfaces 48 and 50 substantially perpendicular to the end surfaces 40 and 42 and the first side surfaces 44 and 46 and facing each other in the Z-axis direction are provided. The first terminal electrode 6 and the second terminal electrode 8 cover the end faces 40, 42 so as to cover the first side faces 44, 46 and the end faces 40, 42 of the second side faces 48, 50 from the end faces 40, 42 of the element body 4, respectively. 42 respectively.

  Each terminal electrode 6 and 8 has electrode wrap-around portions 6a and 8a that cover the end faces 40 and 42 of the element body 4 and the vicinity of the end faces 40 and 42 of the first side faces 44 and 46 and the second side faces 48 and 50, respectively. As shown in FIGS. 6B and 6C, the width W1 of the electrode wraparound portions 6a and 8a in the X-axis direction varies depending on the width W0 (not shown) of the element body 4 in the X-axis direction. Preferably it is 30-500 micrometers.

  Each of the first side surfaces 44 and 46 includes a plurality of first grooves 60 extending at a predetermined angle θ of less than 90 degrees with respect to the second side surfaces 48 and 50, and the terminal electrodes 6 and 8 and the first side surfaces. 44 and 46 so as to enter the connecting portion. The predetermined angle θ is 10 degrees or more, preferably 12 degrees or more, and more preferably 15 degrees or more. The maximum value θmax of the predetermined angle θ is less than 90 degrees, and is preferably determined so that tan θmax is equal to or less than T / W1, as shown in FIG.

  The minimum value of the predetermined angle θ is set to 10 degrees or more. When the predetermined angle θ is less than 10 degrees, the first groove 60 is parallel to the second side surfaces 48 and 50 as shown in FIG. Therefore, the bonding strength between the terminal electrodes 6 and 8 and the element body 4 tends to be weakened. Further, it is preferable that the predetermined angle θ is equal to or less than the maximum value θmax. If the predetermined angle θ is larger than the maximum value θmax, the junction interface between the terminal electrodes 6 and 8 and the element body 4 is formed as shown in FIG. The bubble 70 that has entered is difficult to escape through the first groove 60. If the bubbles that enter the bonding interface between the terminal electrodes 6 and 8 and the element body 4 do not escape, there is a risk of explosion when mounting the components, which is not preferable. Here, the explosion is a phenomenon in which a gas or liquid taken into the terminal electrode is expanded by heating at the time of mounting and a part of the terminal electrode is flipped off.

  The groove depth of each first groove 60 is preferably 2 to 10 μm. When the groove depth is such, the bonding strength between the element body and the terminal electrode is improved. If the groove depth is too deep, the internal electrode layers 2 and 13 may be exposed from the surfaces of the first side surfaces 44 and 46 in the case of a small element body, which is not preferable. The groove width of each first groove 60 is preferably 10 to 150 μm, more preferably 30 to 80 μm. In such a range, the bonding strength between the element body and the terminal electrode is improved.

  Although the mutual space | interval of each 1st groove | channel 60 is not specifically limited, At least 2 or more, Preferably the 3 or more 1st groove | channel 60 enters in the range of the width W1 of the X-axis direction of the electrode surrounding part 6a, 8a. To be determined. The length of the first groove 60 is not particularly limited, and is the length that reaches the second side surface 48 or 50 from the end faces 40, 42, or the length that reaches from the one second side surface 48 to the other second side surface 50. It is preferable that the groove 60 is continuous in the longitudinal direction. However, it is not necessary that all the first grooves 60 formed in the first side surfaces 44 and 46 have such a configuration, and a part or the whole of the first grooves 60 may be discontinuous, or may be the end surface 40. , 42 and the second side surfaces 48, 50 may be provided. However, at least two or more, preferably three or more first grooves 60 are within the range of the width W1 in the X-axis direction of the electrode winding portions 6a and 8a from the exposed surfaces of the first side surfaces 44 and 46. It is preferable to form continuously so that the groove | channel 60 may enter.

  A groove similar to the first groove 60 formed in the first side surfaces 44 and 46 may be formed on the end faces 40 and 42 of the element body 4, but preferably a second groove different from the first groove 60. (Not shown) is formed. The depth of the second groove is smaller than the depth of the first groove 60. Or it is preferable not to form a groove | channel positively in end surface 40,42.

  For example, if grooves are formed in the end faces 40 and 42 of the element body 4 before the element body 4 is sintered, the internal electrodes 12 and 13 drawn to the end faces 40 and 42 are oxidized when the element body 4 is annealed after firing. Therefore, there is a risk that the electrical characteristics may be deteriorated, such as an increase in tan δ. Therefore, it is preferable that the second grooves are not formed on the end faces 40 and 42 of the element body 4 as much as possible. Even if formed, the depth of the second grooves 40 and 42 is greater than the depth of the first groove 60. Small is preferable. Preferably, the depth of the second groove is less than 2 μm.

  The first groove 60 and the second groove are not formed on the second side surfaces 48 and 50 of the element body 4 and are preferably flat surfaces, and one of the pair of second side surfaces 48 and 50 (for example, The bottom surface is the mounting surface. Since no groove is formed on the mounting surface, there is little risk of migration of solder components during mounting, and there is little risk of short circuit failure occurring on the mounting surface of the element body 4. If a groove is formed on the mounting surface, solder flux enters the groove during mounting and it is difficult to remove it by cleaning. If the flux remains, migration of solder components may occur.

  In the present embodiment, since the groove is not formed on the surface opposite to the mounting surface (for example, the upper surface) of the pair of second side surfaces 48 and 50 and is flat and smooth, the suction nozzle at the time of mounting is used. Therefore, it is possible to adsorb better, and the mounting operation can be easily automated. If a groove is formed on the surface opposite to the mounting surface, air flows through the groove, and the suction by the suction nozzle tends to be incomplete, and a mounting error tends to occur.

  Next, the manufacturing method of the multilayer ceramic capacitor 2 as one embodiment of the present invention will be described.

  First, the green laminated body 4a shown in FIGS. 2-5 is formed. In order to form the green laminate 4a, as shown in FIG. 3, a first green sheet 10a on which a first internal electrode pattern 12a is formed and a second green sheet 11a on which a second internal electrode pattern 13a is formed. Are alternately laminated to form a green laminated body 4a.

  The dielectric paste for forming the green sheets 10a and 11a is usually composed of an organic solvent-based paste or an aqueous paste obtained by kneading ceramic powder and an organic vehicle. In the present embodiment, these pastes are preferably organic solvent-based pastes.

  The organic vehicle is obtained by dissolving a binder in an organic solvent. The binder used for the organic vehicle is not particularly limited, and may be appropriately selected from usual various binders such as ethyl cellulose and polyvinyl butyral.

  The internal electrode paste for forming the internal electrode patterns 12a, 13a is composed of various conductive metals and alloys, or various oxides, organometallic compounds, resinates, etc. that become conductive materials after firing, and the above-mentioned organic materials. Prepare by kneading with vehicle. The internal electrode paste may contain a ceramic powder as a co-material as necessary. The common material has an effect of suppressing the sintering of the conductive powder in the firing process.

  The green sheets 10a and 11a are formed by a doctor blade method using the above-described dielectric paste. Further, in order to form the internal electrode patterns 12a and 13a on the respective surfaces of the green sheets 10a and 11a, screen printing or the like may be performed using the internal electrode paste.

  The first green sheet 10a in the green laminate 4a is a portion that will eventually become the first inner dielectric layer 10 shown in FIG. 1, and the second green sheet 11a is finally the second green sheet shown in FIG. This is a portion that becomes the inner dielectric layer 11. The first internal electrode pattern 12a is a portion that will eventually become the first internal electrode layer 12 shown in FIG. 1, and the second internal electrode pattern 13a is finally the second internal electrode shown in FIG. This is the portion that becomes the layer 13.

  In FIG. 3, the number of the internal electrode layers 12 a and 13 a in the green laminated body 4 a is reduced for ease of illustration, but it can be freely set from several to several hundred layers.

  As shown in FIGS. 2 and 3, green sheets 14a to be the outer dielectric layers 14 are stacked at both ends in the stacking direction Z of the green stacked body 4a. The thickness in the stacking direction Z of the green laminate 4a corresponds to the thickness of the element body 4 shown in FIG. 1 after firing.

  As shown in FIGS. 2 and 3, in the green laminate 4a, the first internal electrode pattern 12a and the second internal electrode pattern 13a are along the longitudinal direction X (hereinafter also referred to as the X axis) of the patterns 12a and 13a. This is a recurrence pattern of straight lines that are shifted by a half pattern.

  Further, when viewed along the direction Y (hereinafter also referred to as the Y axis) of the green laminate 4a that is perpendicular to both the longitudinal direction X and the stacking direction Z (hereinafter also referred to as the Z axis) of the patterns 12a and 13a, The first internal electrode pattern 12a and the second internal electrode pattern 13a are separated linear patterns having the same pitch length.

  As shown in FIG. 2, the first internal electrode pattern 12a and the second internal electrode pattern 13a have regions that are not formed at both end positions along the Y axis of the green laminate 4a, and the regions are end portions. A cut-off portion 26 is obtained.

  2 and 3, final cut lines 30x and 30y are shown for easy understanding of the relationship between the green laminate 4a and the green chip 4b. The green chip 4b is a portion that becomes the element body 4 shown in FIG. In this embodiment, in order to finally cut along the planned cutting lines 30x and 30y shown in FIG. 2 and FIG. 3, as shown in FIG. 4, printing with electrode paste is performed on the outermost layer surface of the green laminate 4a. The cutting position mark 30a is formed by the method.

  By reading these cutting position marks 30a with a plurality of cameras, the green laminated body 4a is aligned, and as shown in FIGS. 4 and 5, the cutting lines 30x, 30y are scheduled using a rotary cutting blade 36. A green chip 4b is obtained by cutting the green laminate 4a in a matrix.

  When cutting the green laminated body 4a, as shown in FIG. 5, the green laminated body 4a is fixed on a support base 80 with an adhesive sheet 82 or the like. And the support stand 80 is moved with the predetermined | prescribed feed speed (cutting speed) toward the direction (X-axis or Y-axis) of the rotary cutting blade 36 with the green laminated body 4a. Since the rotary cutting blade 36 rotates clockwise at a predetermined rotational speed in FIG. 5, the green laminated body 4a is cut along the feeding direction (X axis or Y axis) of the support base 80. .

  In the present embodiment, the cutting conditions for cutting along the X-axis direction and the cutting conditions for cutting along the Y-axis direction are changed. For example, when the green laminate 4a is cut along the X-axis direction, the cut surfaces become the first side surfaces 44 and 46 shown in FIG. To cut the green laminated body 4a. Further, when the green laminated body 4a is cut along the Y-axis direction, the cut surfaces become the end faces 40 and 42 shown in FIG. 6A, so that the second groove is formed as described above. The green laminate 4a is cut under such conditions that no groove is formed.

  For example, as the thickness of the rotary cutting blade 36 is thinner, the depth of the groove formed on the cut surface (the first side surfaces 44 and 46 or the end surfaces 40 and 42) at the time of cutting becomes deeper and the rotational speed is faster. The depth of the groove tends to increase. Further, by changing the cutting speed, the number of grooves formed on the cut surface can be changed. Or the formation angle of the 1st groove | channel 60 can be changed by changing the outer diameter of the rotary cutting blade 36. FIG.

  The depth of the groove can also be adjusted by changing the edge angle and shape of the rotary cutting blade 36. Further, the cutting in the X-axis direction may be performed using the rotary cutting blade 36, and the cutting in the Y-axis direction may be performed using a laser beam. According to the cutting by laser light, a groove is hardly formed on the cut surface.

  Next, in this embodiment, the green chip 4b after cutting is subjected to a binder removal process and a baking process to obtain an element body 4 shown in FIG. Various conditions for the binder removal treatment and the firing treatment are not particularly limited, and the firing temperature is, for example, 1000 to 1400 ° C.

  Thereafter, terminal electrodes 6 and 8 are formed on the end faces 40 and 42 where the internal electrode layers 12 and 13 of the element body 4 are exposed. These terminal electrodes 6 and 8 are formed by baking the electrode paste film. Note that a plating process may be performed after baking.

  In the manufacturing method according to the present embodiment, the above-described multilayer ceramic capacitor 2 can be easily manufactured. Moreover, in the present embodiment, the first grooves 60 formed in the first side surfaces 44 and 46 of the element body 4 are formed when the green laminated body 4a is cut into a matrix shape to form a substantially rectangular parallelepiped green chip 4b. Formed simultaneously. Therefore, in the present embodiment, the first groove 60 can be formed without requiring a special process for forming the first groove 60. In the present embodiment, the rotary cutting blade 36 shown in FIG. 5 is used, and the outer diameter, rotation direction, rotation speed, cutting speed, etc. of the cutting blade 36 are appropriately adjusted, as shown in FIG. In addition, the first groove 60 having a predetermined groove depth, groove width, and groove pitch can be easily formed at a predetermined angle θ.

  The present invention is not limited to the above-described embodiment, and can be variously modified within the scope of the present invention. For example, the ceramic electronic component of the present invention is not limited to a multilayer ceramic capacitor, but may be a multilayer varistor, an inductor element, a chip bead, a chip resistor, a chip thermistor, or the like.

Hereinafter, although this invention is demonstrated based on a more detailed Example, this invention is not limited to these Examples.
Example 1

  The multilayer ceramic capacitor 2 was manufactured with 100 samples by the method shown in FIGS. The green laminated body 4a was cut by setting the diameter of the rotary cutting blade (blade) 36 shown in FIGS. 4 and 5 to 85 mm, the blade thickness to 0.15 mm, and the cutting speed in the X-axis direction to 18 m / min. Further, as shown in Table 2, the green laminate 4a is cut in the Y-axis direction by setting the diameter of the rotary cutting blade (blade) 36 to 85 mm, the blade thickness to 0.15 mm, and the cutting speed in the X-axis direction to 5 m. The green laminate 4a was cut as / min.

  As shown in Table 1, the groove depth of the first groove 60 formed on the first side surface was 6.5 μm on average in the state after the element body 4 was fired. In addition, as shown in FIG. 6B, the number of first grooves 60 (the number of grooves on the terminal) entering the width W1 in the X-axis direction of the electrode wrapping portion 8a in the terminal electrode 8 is 9 on average. there were. The angle θ of the first groove 60 was 12.6 degrees on average. From these values, 30 samples were randomly extracted from 100 samples, and average values were obtained.

  When 100 samples were examined for peeling (terminal peeling) of the terminal electrode 6 or 8 from the element body 4, the number was 0. Terminal peeling was measured as follows. First, lead wires are soldered to both end faces of the formed terminal electrode. Next, the lead wires soldered to both end faces are pulled in a direction opposite to each other with a predetermined force (10 N). The number of terminals peeled off as a result of this tensile test is counted.

As shown in Table 2, the average depth of the second grooves formed on the end face was 0.59 μm, and the tan δ of the multilayer ceramic capacitor was 2.3% at the maximum. Tan δ (dielectric loss) is measured using a digital LCR meter (HP4284A manufactured by HP) at a reference temperature of 25 ° C. and a frequency of 1 kHz and an input signal level (measurement voltage) of 1 Vrms with respect to the obtained capacitor sample. It was.
Examples 2-10

  As shown in Table 1, the multilayer ceramic capacitor 2 was sampled in the same manner as in Example 1 except that the diameter of the rotary cutting blade (blade) 36, the blade thickness, and the cutting speed in the X-axis direction were changed. Manufactured in pieces.

Similarly to Example 1, the groove depth of the first groove 60 formed on the first side surface, the number of the first grooves 60 applied to the terminal, the angle θ of the first groove 60, and the results of the terminal peeling were obtained. Table 1 shows.
Examples 20-24

As shown in Table 2, the examples except that the diameter of the rotary cutting blade (blade) 36, the blade thickness, and the cutting speed in the Y-axis direction were changed to cut the green laminate 4a in the Y-axis direction. In the same manner as in Example 1, a multilayer ceramic capacitor 2 was manufactured with 100 samples. The results of examining the groove depth and tan δ in the end faces 40 and 42 in the same manner as in Example 1 are shown in Table 2.
Evaluation

  As shown in Table 1, in order to suppress the peeling (terminal peeling) of the terminal electrodes 6 and 8 from the element body 4, the angle θ of the first groove 60 is preferably 10 degrees or more, and the groove depth is preferably Has been confirmed to be 2 μm or more, more preferably 2.2 to 9.0 μm, more preferably 2.2 to 6.1 μm, and the number of first grooves on the terminals is preferably 3 or more, preferably 9 or more. . Furthermore, as shown in Table 2, when the second groove was formed on the end faces 40 and 42, it was confirmed that the depth of the second groove is preferably 2 μm or less, more preferably 1 μm or less.

2 ... Multilayer ceramic capacitor 4 ... Element body 4a ... Green laminated body 4b ... Green chip 40, 42 ... End face 44, 46 ... First side face 48, 50 ... Second side face 6 ... First terminal electrode 8 ... Second terminal electrode 10 First inner dielectric layer 10a First green sheet 11 Second inner dielectric layer 11a Second green sheet 12 First internal electrode layer 12a First internal electrode pattern 13 Second internal electrode layer 13a Second internal electrode patterns 30x, 30y ... Planned cutting line 36 ... Rotary cutting blade 60 ... First groove

Claims (10)

A substantially rectangular parallelepiped element body having an end surface facing each other, a first side surface substantially perpendicular to the end surface and facing each other, and a second side surface substantially perpendicular to the end surface and the first side surface and facing each other. When,
A ceramic electronic component having a pair of terminal electrodes formed on the end face so as to cover the end faces of the first and second side faces from the end face of the element body,
A plurality of first grooves extending at a predetermined angle of less than 90 degrees with respect to the second side surface enter the connection portion between the terminal electrode and the first side surface in the pair of first side surfaces. Ceramic electronic parts that are formed on.   2. The ceramic electronic component according to claim 1, wherein a second groove is formed on each of the end faces, and a depth of the second groove is smaller than a depth of the first groove.   The ceramic electronic component according to claim 2, wherein a depth of the second groove is less than 2 μm.   The ceramic electronic component according to claim 1, wherein a depth of the first groove is 2 to 10 μm.   The ceramic electronic component according to claim 1, wherein three or more first grooves are formed on each first side surface.   The ceramic electronic component according to claim 1, wherein the predetermined angle of the first groove is 10 degrees or more.   7. The ceramic electronic component according to claim 1, wherein no groove is formed in the pair of second side surfaces, and one of the pair of second side surfaces is a mounting surface. A step of laminating green sheets together with the internal electrode pattern layer to form a laminate,
Cutting the laminate into a matrix to form a substantially rectangular parallelepiped green chip;
Firing the green chip to obtain an element body;
Forming a terminal electrode on each of a pair of opposed end faces of the element body,
Before forming the terminal electrode, the two first side surfaces facing the end surface of the element body so as to be substantially orthogonal to each other have a predetermined angle of less than 90 degrees with respect to the remaining two second side surfaces. A method of manufacturing a ceramic electronic component, wherein a plurality of extending first grooves are formed.   The method of manufacturing a ceramic electronic component according to claim 8, wherein the first groove is formed at the same time when the stacked body is cut into a matrix to form a substantially rectangular parallelepiped green chip.   The method for manufacturing a ceramic electronic component according to claim 8, wherein the first groove is formed simultaneously when the laminated body is cut with a rotary cutting blade to form a substantially rectangular parallelepiped green chip.

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