CN104701010A - Multilayer ceramic capacitor - Google Patents
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- CN104701010A CN104701010A CN201510115032.0A CN201510115032A CN104701010A CN 104701010 A CN104701010 A CN 104701010A CN 201510115032 A CN201510115032 A CN 201510115032A CN 104701010 A CN104701010 A CN 104701010A
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Abstract
The invention discloses a multilayer ceramic capacitor comprising a ceramic body. The ceramic body comprises a plurality of first internal electrode layer and a plurality of second internal electrode layers. In the width direction, the ceramic body comprises a first portion and a second portion that are both in cuboid shapes. Nickel is contained in materials of all the first internal electrode layers and the second internal electrode layers. The area of the first internal electrode layers drop into the first portion is greater than the area of the first internal electrode layers drop into the second portion; and the area of the second internal electrode layers drop into the first portion is greater than or equal to the area of the second internal electrode layer drop into the second portion. A slab can be used for supporting samples to be detected upon inspecting a fracture surface of the multilayer ceramic capacitor or the ceramic body; and a permanent magnet arranged below the slab is used for turning over the samples to be tested on the slab. Due to the fact that the nickel content of the first portion of the ceramic body of the multilayer ceramic capacitor is more than the nickel content of the second portion, the samples to be tested are easy to be turned into a uniform position orientation.
Description
Technical field
The present invention relates to electronic devices and components field, particularly relate to a kind of multilayer ceramic capacitor.
Background technology
Conventional multilayer ceramic capacitor comprises the ceramic body of cuboid and is arranged at two external electrodes of ceramic body opposite end.Ceramic body comprises dielectric layer that is alternately laminated and that be connected respectively between multiple inner electrode layer of the different external electrode of polarity and multiple inner electrode layer being laminated in dissimilar polarities respectively, thus multilayer ceramic capacitor can obtain higher capability value.Along with multilayer ceramic capacitor develops to high power capacity, the stacking number of plies of dielectric layer and inner electrode layer increases, and the height of multilayer ceramic capacitor is increased and to equal or close to its width.Therefore to carry out section inspection to the close multilayer ceramic capacitor of wide and thick size or ceramic body, by arrangements of chips to be tested in mould time, there is the possibility in the wrong face of chip, the chip that namely may reach half due to positioning orientating wrong and required abradant surface and sightingpiston cannot be obtained, cause checkability to reduce and operating difficulties.
Summary of the invention
Based on this, be necessary provide one efficiency when carrying out section inspection higher and operate conveniently multilayer ceramic capacitor.
A kind of multilayer ceramic capacitor, comprises ceramic body and is arranged at the first external electrode and the second external electrode of described ceramic body opposite end respectively;
Described ceramic body comprises alternately laminated multiple first inner electrode layer and multiple the second inner electrode layer, and is laminated in the multiple dielectric layers between adjacent described first inner electrode layer and described the second inner electrode layer;
Described ceramic body is cuboid and has first surface, second surface, the 3rd surface, the 4th surface, the 5th surface and the 6th surface, the plane of the wide and high formation of described first surface, described second surface and described ceramic body is parallel to each other, length and the high plane formed of described 3rd surface, described 4th surface and described ceramic body are parallel to each other, described 5th surface, described 6th surface and the length of described ceramic body and the plane of wide formation parallel to each other;
Described ceramic body comprises the Part I and Part II that are cuboid in the direction of the width, the length of described Part I and described Part II equals the length of described ceramic body, the height of described Part I and described Part II equals the height of described ceramic body, the width of described Part I is equal with the width of described Part II, described Part I comprises described 3rd surface, and described Part II comprises described 4th surface;
The material of described first inner electrode layer and described the second inner electrode layer is all containing nickel, the area that described first inner electrode layer falls into described Part I is greater than the area that described first inner electrode layer falls into described Part II, and the area that described the second inner electrode layer falls into described Part I is more than or equal to the area that described the second inner electrode layer falls into described Part II.
In one embodiment, described the first external electrode covers described first surface completely, and the distance that described the first external electrode bends extension one section identical respectively to described 3rd surface, described 4th surface, described 5th surface with described 6th surface forms the first extension;
Described the second external electrode covers described second surface completely, and described the second external electrode bends the identical distance of extension one section respectively to described 3rd surface, described 4th surface, described 5th surface with described 6th surface, form the second extension, the width of described first extension and described second extension is equal.
In one embodiment, described first inner electrode layer comprises first area and second area;
One end of described first area is connected with described the first external electrode, and the other end of described first area extends to described ceramic body and is connected with described second area;
Described first area is less than the width of described first extension away from one end of described first surface and the distance of described first surface, and the area that described first area falls into described Part I is greater than the area that described first area falls into described Part II;
Described second area is rectangle and six surfaces of described second area and described ceramic body are all formed with gap, described second area is less than the width of described first extension near the distance of one end of described first surface and described first surface, described second area is less than the width of described second extension near the distance of one end of described second surface and described second surface, described second area is less than or equal to described second area one end near described 4th surface and the distance on described 4th surface near the one end on described 3rd surface and the distance on described 3rd surface.
In one embodiment, described the second inner electrode layer comprises the 3rd region and the 4th region;
The one end in described 3rd region is connected with described the second external electrode, the other end in described 3rd region to described ceramic body extend and with described 4th joint area;
Described 3rd region is less than the width of described second extension away from one end of described second surface and the distance of described second surface, the area that described 3rd region falls into described Part I is more than or equal to the area that described 3rd region falls into described Part II;
Described 4th region is rectangle and six surfaces of described 4th region and described ceramic body are all formed with gap, and the projection of described 4th region on described first inner electrode layer overlaps with described second area.
In one embodiment, described 3rd region falls in described Part I completely.
In one embodiment, described first inner electrode layer comprises first area and second area;
One end of described first area is connected with described the first external electrode, and the other end of described first area extends to described ceramic body and is connected with described second area;
Described first area is less than the width of described first extension away from one end of described first surface and the distance of described first surface, and the area that described first area falls into described Part I equals the area that described first area falls into described Part II;
Described second area is rectangle and six surfaces of described second area and described ceramic body are all formed with gap, described second area is less than the width of described first extension near the distance of one end of described first surface and described first surface, described second area is less than the width of described second extension near the distance of one end of described second surface and described second surface, and described second area is less than described second area one end near described 4th surface and the distance on described 4th surface near the one end on described 3rd surface and the distance on described 3rd surface.
In one embodiment, described the second inner electrode layer comprises the 3rd region and the 4th region;
The one end in described 3rd region is connected with described the second external electrode, the other end in described 3rd region to described ceramic body extend and with described 4th joint area;
Described 3rd region is less than the width of described second extension away from one end of described second surface and the distance of described second surface, the area that described 3rd region falls into described Part I is more than or equal to the area that described 3rd region falls into described Part II;
Described 4th region is rectangle and six surfaces of described 4th region and described ceramic body are all formed with gap, and the projection of described 4th region on described first inner electrode layer overlaps with described second area.
In one embodiment, described first inner electrode layer and described the second inner electrode layer are nickel inner electrode, and the thickness of described first inner electrode layer and described the second inner electrode layer is equal.
In one embodiment; described ceramic body also comprises the first protective layer and the second protective layer that are laminated in described first inner electrode layer and the described relative both sides of the second inner electrode layer; a surface of described first protective layer is described 5th surface, and a surface of described second protective layer is described 6th surface.
In one embodiment, described first protective layer comprises additional electrode layer, and described additional electrode layer is nickel inner electrode, and the thickness of described additional electrode layer is not less than the thickness of described first inner electrode layer;
The projection of described additional electrode layer on described first inner electrode layer falls into the part that described second area is positioned at described Part I.
First inner electrode layer of the ceramic body of above-mentioned multilayer ceramic capacitor and the material of the second inner electrode layer are all containing nickel, when section inspection is carried out to this multilayer ceramic capacitor or ceramic body, measuring samples can be carried with flat board and with the permanent magnet being positioned over dull and stereotyped below, the measuring samples on flat board be overturn, the area falling into Part I due to the first inner electrode layer is greater than the area that the first inner electrode layer falls into Part II, the area that the second inner electrode layer falls into Part I is more than or equal to the area that the second inner electrode layer falls into Part II, thus make the nickel content of nickel content more than Part II of the Part I of the ceramic body of above-mentioned multilayer ceramic capacitor, measuring samples easily overturns as unified positioning orientating, namely fit with dull and stereotyped in the 3rd surface of above-mentioned multilayer ceramic capacitor, so the possibility of measuring samples positioning orientating mistake just can be got rid of when being arranged in mould by measuring samples, improve checkability, and arrange the operation of measuring samples more for convenience.
Accompanying drawing explanation
Fig. 1 is the schematic cross-section of the multilayer ceramic capacitor of an execution mode;
Fig. 2 is the schematic diagram at the first inner electrode layer place of multilayer ceramic capacitor as shown in Figure 1;
Fig. 3 is the schematic diagram at the second inner electrode layer place of multilayer ceramic capacitor as shown in Figure 1;
Fig. 4 is the schematic cross-section of the multilayer ceramic capacitor of another execution mode;
Fig. 5 is the schematic diagram at the first inner electrode layer place of multilayer ceramic capacitor as shown in Figure 4;
Fig. 6 is the schematic diagram at the second inner electrode layer place of multilayer ceramic capacitor as shown in Figure 4;
Fig. 7 is the schematic cross-section of the multilayer ceramic capacitor of another execution mode;
Fig. 8 is the schematic diagram at the first inner electrode layer place of multilayer ceramic capacitor as shown in Figure 7;
Fig. 9 is the schematic diagram at the second inner electrode layer place of multilayer ceramic capacitor as shown in Figure 7;
Figure 10 is the schematic diagram at the additional electrode layer place of multilayer ceramic capacitor as shown in Figure 7.
Embodiment
Mainly in conjunction with the drawings and the specific embodiments multilayer ceramic capacitor is described in further detail below.
The multilayer ceramic capacitor 100 of an execution mode as shown in Figure 1, Figure 2 and Figure 3, comprises ceramic body 10 and is arranged at the first external electrode 20 and the second external electrode 30 of ceramic body 10 opposite end respectively.Ceramic body 10 comprises alternately laminated multiple first inner electrode layer 101 and multiple the second inner electrode layer 102, and the multiple dielectric layers 103 be laminated between the first adjacent inner electrode layer 101 and the second inner electrode layer 102 and the first protective layer 1041 and the second protective layer 1042 being laminated in the first inner electrode layer 101 both sides relative to the second inner electrode layer 102.
Ceramic body 10 is cuboid, there is first surface, second surface, the 3rd surface, the 4th surface, the 5th surface and the 6th surface, the plane of the wide and high formation of first surface, second surface and ceramic body 10 is parallel to each other, length and the high plane formed of the 3rd surface, the 4th surface and ceramic body 10 are parallel to each other, the 5th surface, the 6th surface and the length of ceramic body 10 and the plane of wide formation parallel to each other.
Ceramic body 10 is divided into Part I I and Part II II on the Width of multilayer ceramic capacitor 100, Part I I and Part II II are cuboid, the length of Part I I and Part II II equals the length of ceramic body 10, the height of Part I I and Part II II equals the height of ceramic body 10, and the width of Part I I is equal with the width of Part II II.Part I I comprises the 3rd surface, and Part II II comprises the 4th surface.
The material of the first inner electrode layer 101 and the second inner electrode layer 102 is all containing nickel, the area that first inner electrode layer 101 falls into Part I I is greater than the area that the first inner electrode layer 101 falls into Part II II, and the area that the second inner electrode layer 102 falls into Part I I is more than or equal to the area that the second inner electrode layer 102 falls into Part II II.Thus make the nickel content of nickel content more than Part II II of Part I I.
The first external electrode 20 and the second external electrode 30 cover first surface and second surface respectively completely.The first external electrode 20 bends the identical distance of extension one section respectively to the 3rd surface, the 4th surface, the 5th surface with the 6th surface, forms the first extension 201; The second external electrode 30 bends the identical distance of extension one section respectively to the 3rd surface, the 4th surface, the 5th surface with the 6th surface, forms the second extension 301.The width of the first extension 201 is D1, and the width of the second extension 301 is that D2, D1 equal D2.
First inner electrode layer 101 and the second inner electrode layer 102 are all vertical with the 4th surface with first surface, second surface, the 3rd surface, and the first inner electrode layer 101 and the second inner electrode layer 102 are all surperficial with the 5th surperficial parallel with the 6th.
First inner electrode layer 101 is nickel inner electrode.First inner electrode layer 101 comprises first area 1011 and second area 1012.
In present embodiment, first area 1011 is rectangle; In other implementations, first area 1011 can also be other shapes.
One end of first area 1011 is connected with the first external electrode 20, and the other end extends to ceramic body 10 inside and is connected with second area 1012.First area 1011 is that D3, D3 are less than D1 away from one end of first surface and the distance of first surface, and first area 1011 can be avoided to be exposed to the 3rd surface and to reduce the reliability of multilayer ceramic capacitor 100.The area that first area 1011 falls into Part I I is greater than the area that first area 1011 falls into Part II II, so then first area 1011 at the nickel content of Part I I more than the nickel content of first area 1011 at Part II II.
Second area 1012 is rectangle, is formed with gap with each surface of ceramic body 10.Second area 1012 is that D4, D4 are less than D1 near the distance of one end of first surface and first surface, and second area 1012 is that D5, D5 are less than D2 near the distance of one end of second surface and second surface.Second area 1012 is D6 near the one end on the 3rd surface and the distance on the 3rd surface, and second area 1012 is that D7, D6 equal D7 near the one end on the 4th surface and the distance on the 4th surface.
The second inner electrode layer 102 is nickel inner electrode.The second inner electrode layer 102 comprises the 3rd region 1021 and the 4th region 1022.
In present embodiment, the 3rd region 1021 is rectangle; In other implementations, the 3rd region 1021 can also be other shapes.
The one end in the 3rd region 1021 is connected with the second external electrode 30, and the other end extends to ceramic body 10 inside and is connected with the 4th region 1022.3rd region 1021 is that D8, D8 are less than D2 away from one end of second surface and the distance of second surface, and the 3rd region 1021 can be avoided to be exposed to the 3rd surface and to reduce the reliability of multilayer ceramic capacitor 100.The area that 3rd region 1021 falls into Part I I is greater than the area that the 3rd region 1021 falls into Part II II, so then the 3rd region 1021 at the nickel content of Part I I more than the nickel content of the 3rd region 1021 at Part II II.
In other examples, the area that 3rd region 1021 falls into Part I I also can equal the area that the 3rd region 1021 falls into Part II II, and so then the 3rd region 1021 equals the nickel content of the 3rd region 1021 at Part II II at the nickel content of Part I I.
4th region 1022 is rectangle, is formed with gap with each surface of ceramic body 10.The projection of 4th region 1022 on the first inner electrode layer 101 overlaps with second area 1012.So, then the distance on the 4th region 1022 and first surface, second surface, the 3rd surface and the 4th surface, is the distance on second area 1012 and first surface, second surface, the 3rd surface and the 4th surface.
Second area 1012 and the 4th region 1022 can also be other shapes, but are preferably rectangle, are conducive to raising capacity.
D4 is less than D1, and D5 is less than D2, and the projection of the 4th region 1022 on the first inner electrode layer 101 overlaps with second area 1012, so then second area 1012 and the 4th region 1022 have larger right opposite amass, be conducive to raising capacity.
D6 equals D7, and the projection of the 4th region 1022 on the first inner electrode layer 101 overlaps with second area 1012, the area that so then second area 1012 and the 4th region 1022 fall into Part I I equals the area that second area 1012 and the 4th region 1022 fall into Part II II.
The thickness of the first inner electrode layer 101 and the second inner electrode layer 102 is equal.
First protective layer 1041 and the second protective layer 1042 are laminated in the relative both sides of the first inner electrode layer 101 and the second inner electrode layer 102 respectively.A surface of the first protective layer 1041 is the 5th surface, and a surface of the second protective layer 1042 is the 6th surface.
The area that first area 1011 and the 3rd region 1021 fall into Part II II is greater than respectively by the area making first area 1011 and the 3rd region 1021 fall into Part I I, the area that second area 1012 and the 4th region 1022 fall into Part I I equals the area that second area 1012 and the 4th region 1022 fall into Part II II respectively, then the nickel content of the Part I I of ceramic body 10 is more than the nickel content of Part II II.
Dielectric layer 103 is laminated between the first adjacent inner electrode layer 101 and the second inner electrode layer 102 respectively.The main component of dielectric layer 103 can be the high dielectric constant ceramic materials such as barium titanate, also can be the low-k ceramic materials such as calcium zirconate.
First protective layer 1041 is identical with the composition of dielectric layer 103 with the composition of the second protective layer 1042, is conducive to uniformity and the compactness of ceramic body 10.
The ceramic body 10 of above-mentioned multilayer ceramic capacitor 100 is containing nickel, when then section inspection being carried out to this multilayer ceramic capacitor 100 or ceramic body 10, measuring samples can be carried with flat board and with the permanent magnet being positioned over dull and stereotyped below, the measuring samples on flat board be overturn, because the nickel content of the Part I I of ceramic body 10 is more than the nickel content of Part II II, measuring samples easily overturns as unified positioning orientating, namely fit with dull and stereotyped in the 3rd surface of ceramic body 10, so the possibility of measuring samples positioning orientating mistake just can be got rid of when being arranged in mould by measuring samples, improve checkability, and arrange the operation of measuring samples more for convenience.
The multilayer ceramic capacitor 400 of another execution mode as shown in Figure 4, Figure 5 and Figure 6, comprises ceramic body 40 and is arranged at the first external electrode 50 and the second external electrode 60 of ceramic body 40 opposite end respectively.Ceramic body 40 comprises alternately laminated multiple first inner electrode layer 401 and multiple the second inner electrode layer 402, and the multiple dielectric layers 403 be laminated between the first adjacent inner electrode layer 401 and the second inner electrode layer 402 and the first protective layer 4041 and the second protective layer 4042 being laminated in the first inner electrode layer 401 both sides relative to the second inner electrode layer 402.
Multilayer ceramic capacitor 400 is substantially identical with the structure of multi-layer capacitor 100, and distinctive points is, the first inner electrode layer 401 of multilayer ceramic capacitor 400 and the second inner electrode layer 402 are distinguished to some extent.
Ceramic body 40 is cuboid, there is first surface, second surface, the 3rd surface, the 4th surface, the 5th surface and the 6th surface, the plane of the wide and high formation of first surface, second surface and ceramic body 40 is parallel to each other, length and the high plane formed of the 3rd surface, the 4th surface and ceramic body 40 are parallel to each other, the 5th surface, the 6th surface and the length of ceramic body 40 and the plane of wide formation parallel to each other.
Ceramic body 40 is divided into Part I I and Part II II on multilayer ceramic capacitor 400 Width, Part I I and Part II II are cuboid, the length of Part I I and Part II II equals the length of ceramic body 40, the height of Part I I and Part II II equals the height of ceramic body 40, and the width of Part I I is equal with the width of Part II II.Part I I comprises the 3rd surface, and Part II II comprises the 4th surface.
The first external electrode 50 and the second external electrode 60 cover first surface and second surface respectively completely.The first external electrode 50 bends the identical distance of extension one section respectively to the 3rd surface, the 4th surface, the 5th surface with the 6th surface, forms the first extension 501; The second external electrode 60 bends the identical distance of extension one section respectively to the 3rd surface, the 4th surface, the 5th surface with the 6th surface, forms the second extension 601.The width of the first extension 501 is D1, and the width of the second extension 601 is D2, D1=D2.
First inner electrode layer 401 and the second inner electrode layer 402 are all vertical with the 4th surface with first surface, second surface, the 3rd surface, and the first inner electrode layer 401 and the second inner electrode layer 402 are all surperficial with the 5th surperficial parallel with the 6th.
First inner electrode layer 401 and the second inner electrode layer 402 are nickel inner electrode.
First inner electrode layer 401 comprises first area 4011 and second area 4012.
In present embodiment, first area 4011 is substantially in being recessed hexagon.One end of first area 4011 is connected with the first external electrode 50, and the other end extends to ceramic body 40 inside and is connected with second area 4012.First area 4011 is that D3, D3 are less than D1 away from one end of first surface and the distance of first surface, and first area 4011 can be avoided to be exposed to the 3rd surface and to reduce the reliability of multilayer ceramic capacitor 400.The area that first area 4011 falls into Part I I is greater than the area that first area 4011 falls into Part II II, so then first area 4011 at the nickel content of Part I I more than the nickel content of first area 4011 at Part II II.
Second area 4012 is rectangle, is formed with gap with each surface of ceramic body 40.Second area 4012 is that D4, D4 are less than D1 near the distance of one end of first surface and first surface, and second area 4012 is that D5, D4 are less than D2 near the distance of one end of second surface and second surface.Second area 4012 is D6 near the one end on the 3rd surface and the distance on the 3rd surface, and second area 4012 is that D7, D6 equal D7 near the one end on the 4th surface and the distance on the 4th surface.
The second inner electrode layer 402 comprises the 3rd region 4021 and the 4th region 4022.
In present embodiment, the 3rd region 4021 is rectangle.The one end in the 3rd region 4021 is connected with the second external electrode 60, and the other end extends to ceramic body 40 inside and is connected with the 4th region 4022.3rd region 4021 is that D8, D8 are less than D2 away from one end of second surface and the distance of second surface, and the 3rd region 4021 can be avoided to be exposed to the 3rd surface and to reduce the reliability of multilayer ceramic capacitor 400.In present embodiment, the 3rd region 4021 falls into Part I I completely, so then the 3rd region 4021 at the nickel content of Part I I more than the nickel content of the 3rd region 4021 at Part II II.
4th region 4022 is rectangle, is formed with gap with each surface of ceramic body 40.The projection of 4th region 4022 on the first inner electrode layer 401 overlaps with second area 4012.
Second area 4012 and the 4th region 4022 can also be other shapes, but are preferably rectangle, are conducive to raising capacity.
D4 is less than D1, and D5 is less than D2, and the projection of the 4th region 4022 on the first inner electrode layer 401 overlaps with second area 4012, so then second area 4012 and the 4th region 4022 have larger right opposite amass, be conducive to raising capacity.
D6 equals D7, and the projection of the 4th region 4022 on the first inner electrode layer 401 overlaps with second area 4012, the area that so then second area 4012 and the 4th region 4022 fall into Part I I equals the area that second area 4012 and the 4th region 4022 fall into Part II II respectively.
The thickness of the first inner electrode layer 401 and the second inner electrode layer 402 is equal.
First protective layer 4041 and the second protective layer 4042 are laminated in the relative both sides of the first inner electrode layer 401 and the second inner electrode layer 402 respectively.A surface of the first protective layer 4041 is the 5th surface, and a surface of the second protective layer 4042 is the 6th surface.
The area that first area 4011 and the 3rd region 4021 fall into Part II II is greater than respectively by the area making first area 4011 and the 3rd region 4021 fall into Part I I, the area that second area 4012 and the 4th region 4022 fall into Part I I equals the area that second area 4012 and the 4th region 4022 fall into Part II II respectively, then the nickel content of the Part I I of ceramic body 40 is more than the nickel content of Part II II.
Dielectric layer 403 is laminated between the first adjacent inner electrode layer 401 and the second inner electrode layer 402 respectively.The main component of dielectric layer 403 can be the high dielectric constant ceramic materials such as barium titanate, also can be the low-k ceramic materials such as calcium zirconate.
First protective layer 4041 is identical with the composition of dielectric layer 403 with the composition of the second protective layer 4042, is conducive to uniformity and the compactness of ceramic body 40.
The ceramic body 40 of above-mentioned multilayer ceramic capacitor 400 is containing nickel, when then section inspection being carried out to this multilayer ceramic capacitor 400 or ceramic body 40, measuring samples can be carried with flat board and with the permanent magnet being positioned over dull and stereotyped below, the measuring samples on flat board be overturn, because the nickel content of the Part I I of ceramic body 40 is more than the nickel content of Part II II, measuring samples easily overturns as unified positioning orientating, namely fit with dull and stereotyped in the 3rd surface of ceramic body 40, so the possibility of measuring samples positioning orientating mistake just can be got rid of when being arranged in mould by measuring samples, improve checkability, and arrange the operation of measuring samples more for convenience.
The multilayer ceramic capacitor 700 of another execution mode as shown in Fig. 7, Fig. 8, Fig. 9 and Figure 10, comprises ceramic body 70 and is arranged at the first external electrode 80 and the second external electrode 90 of ceramic body 70 opposite end respectively.Ceramic body 70 comprises alternately laminated multiple first inner electrode layer 701 and multiple the second inner electrode layer 702, and the multiple dielectric layers 703 be laminated between the first adjacent inner electrode layer 701 and the second inner electrode layer 702 and the first protective layer 7041 and the second protective layer 7042 being laminated in the first inner electrode layer 701 both sides relative to the second inner electrode layer 702.
Multilayer ceramic capacitor 700 is substantially identical with the structure of multi-layer capacitor 100, and distinctive points is, the first inner electrode layer 701 of multilayer ceramic capacitor 700, the second inner electrode layer 702 and the first protective layer 7041 are distinguished to some extent.
Ceramic body 70 is cuboid, there is first surface, second surface, the 3rd surface, the 4th surface, the 5th surface and the 6th surface, the plane of the wide and high formation of first surface, second surface and ceramic body 70 is parallel to each other, length and the high plane formed of the 3rd surface, the 4th surface and ceramic body 70 are parallel to each other, the 5th surface, the 6th surface and the length of ceramic body 70 and the plane of wide formation parallel to each other.
Ceramic body 70 is divided into Part I I and Part II II on multilayer ceramic capacitor 700 Width, Part I I and Part II II are cuboid, the length of Part I I and Part II II equals the length of ceramic body 70, the height of Part I I and Part II II equals the height of ceramic body 70, and the width of Part I I is equal with the width of Part II II.Part I I comprises the 3rd surface, and Part II II comprises the 4th surface.
The first external electrode 80 and the second external electrode 90 cover first surface and second surface respectively completely.The first external electrode 80 bends the identical distance of extension one section respectively to the 3rd surface, the 4th surface, the 5th surface with the 6th surface, forms the first extension 801; The second external electrode 90 bends the identical distance of extension one section respectively to the 3rd surface, the 4th surface, the 5th surface with the 6th surface, forms the second extension 901.The width of the first extension 801 is D1, and the width of the second extension 901 is D2, D1=D2.
First inner electrode layer 701 and the second inner electrode layer 702 are all vertical with the 4th surface with first surface, second surface, the 3rd surface, and the first inner electrode layer 701 and the second inner electrode layer 702 are all surperficial with the 5th surperficial parallel with the 6th.
First inner electrode layer 701 and the second inner electrode layer 702 are nickel inner electrode.First inner electrode layer 701 comprises first area 7011 and second area 7012.
One end of first area 7011 is connected with the first external electrode 80, and the other end extends to ceramic body 70 inside and is connected with second area 7012.First area 7011 is that D3, D3 are less than D1 away from one end of first surface and the distance of first surface, and first area 7011 can be avoided to be exposed to the 3rd surface and to reduce the reliability of multilayer ceramic capacitor 700.The area that first area 7011 falls into Part I I equals the area that first area 7011 falls into Part II II, and so then first area 7011 equals the nickel content of first area 7011 at Part II II at the nickel content of Part I I.
Second area 7012 is rectangle, is formed with gap with each surface of ceramic body 70.Second area 7012 is that D4, D4 are less than D1 near the distance of one end of first surface and first surface, and second area 7012 is that D5, D5 are less than D2 near the distance of one end of second surface and second surface.Second area 7012 is D6 near the one end on the 3rd surface and the distance on the 3rd surface, and second area 7012 is that D7, D6 are less than D7 near the one end on the 4th surface and the distance on the 4th surface.Like this then second area 7012 is greater than the nickel content of second area 7012 at Part II II at the nickel content of Part I I.
The second inner electrode layer 702 is nickel inner electrode.The second inner electrode layer 702 comprises the 3rd region 7021 and the 4th region 7022.
The one end in the 3rd region 7021 is connected with the second external electrode 90, and the other end extends to ceramic body 70 inside and is connected with the 4th region 7022.3rd region 7021 is that D8, D8 are less than D2 away from one end of second surface and the distance of second surface, and the 3rd region 7021 can be avoided to be exposed to the 3rd surface and to reduce the reliability of multilayer ceramic capacitor 700.The area that 3rd region 7021 falls into Part I I equals the area that the 3rd region 7021 falls into Part II II, and so then the 3rd region 7021 equals the nickel content of the 3rd region 7021 at Part II II at the nickel content of Part I I.
4th region 7022 is rectangle, is formed with gap with each surface of ceramic body 70.The projection of 4th region 7022 on the first inner electrode layer 701 overlaps with second area 7012.
Second area 7012 and the 4th region 7022 can also be other shapes, but are preferably rectangle, are conducive to raising capacity.
D4 is less than D1, and D5 is less than D2, and the projection of the 4th region 7022 on the first inner electrode layer 701 overlaps with second area 7012, so then second area 7012 and the 4th region 7022 have larger right opposite amass, be conducive to raising capacity.
D6 is less than D7, and the projection of the 4th region 7022 on the first inner electrode layer 701 overlaps with second area 7012, the area that so then second area 7012 and the 4th region 7022 fall into Part I I is greater than the area that second area 7012 and the 4th region 7022 fall into Part II II respectively.
The thickness of the first inner electrode layer 701 and the second inner electrode layer 702 is equal.
First protective layer 7041 and the second protective layer 7042 are laminated in the relative both sides of the first inner electrode layer 701 and the second inner electrode layer 702 respectively.A surface of the first protective layer 7041 is the 5th surface, and a surface of the second protective layer 7042 is the 6th surface.
First protective layer 7041 comprises additional electrode layer 70411.Additional electrode layer 70411 is nickel inner electrode.The projection of additional electrode layer 70411 on the first inner electrode layer 701 falls into the part that second area 7012 is positioned at Part I I, like this then additional electrode layer 70411 is also positioned at Part I I, and substantially the capacity of multilayer ceramic capacitor 700 is not had an impact.The thickness of additional electrode layer 70411 is not less than the thickness of the first inner electrode layer 701, and so then additional electrode layer 70411 can provide more nickel.
The area that first area 7011 and the 3rd region 7021 fall into Part II II is equaled respectively by the area making first area 7011 and the 3rd region 7021 fall into Part I I, the area that second area 7012 and the 4th region 7022 fall into Part I I is greater than the area that second area 7012 and the 4th region 7022 fall into Part II II respectively, and arrange and be positioned at the additional electrode layer 70411 of Part I I, then the nickel content of the Part I I of ceramic body 70 is more than the nickel content of Part II II.
Dielectric layer 703 is laminated between the first adjacent inner electrode layer 701 and the second inner electrode layer 702 respectively.The main component of dielectric layer 703 can be the high dielectric constant ceramic materials such as barium titanate, also can be the low-k ceramic materials such as calcium zirconate.
First protective layer 7041 is identical with the composition of dielectric layer 703 with the composition of the second protective layer 7042 except the remainder of additional electrode layer 70411, is conducive to uniformity and the compactness of ceramic body 70.
The ceramic body 70 of above-mentioned multilayer ceramic capacitor 700 is containing nickel, when then section inspection being carried out to this multilayer ceramic capacitor 700 or ceramic body 70, measuring samples can be carried with flat board and with the permanent magnet being positioned over dull and stereotyped below, the measuring samples on flat board be overturn, because the nickel content of the Part I I of ceramic body 70 is more than the nickel content of Part II II, measuring samples easily overturns as unified positioning orientating, namely fit with dull and stereotyped in the 3rd surface of ceramic body 70, so the possibility of measuring samples positioning orientating mistake just can be got rid of when being arranged in mould by measuring samples, improve checkability, and arrange the operation of measuring samples more for convenience.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a multilayer ceramic capacitor, is characterized in that, comprises ceramic body and is arranged at the first external electrode and the second external electrode of described ceramic body opposite end respectively;
Described ceramic body comprises alternately laminated multiple first inner electrode layer and multiple the second inner electrode layer, and is laminated in the multiple dielectric layers between adjacent described first inner electrode layer and described the second inner electrode layer;
Described ceramic body is cuboid and has first surface, second surface, the 3rd surface, the 4th surface, the 5th surface and the 6th surface, the plane of the wide and high formation of described first surface, described second surface and described ceramic body is parallel to each other, length and the high plane formed of described 3rd surface, described 4th surface and described ceramic body are parallel to each other, described 5th surface, described 6th surface and the length of described ceramic body and the plane of wide formation parallel to each other;
Described ceramic body comprises the Part I and Part II that are cuboid in the direction of the width, the length of described Part I and described Part II equals the length of described ceramic body, the height of described Part I and described Part II equals the height of described ceramic body, the width of described Part I is equal with the width of described Part II, described Part I comprises described 3rd surface, and described Part II comprises described 4th surface;
The material of described first inner electrode layer and described the second inner electrode layer is all containing nickel, the area that described first inner electrode layer falls into described Part I is greater than the area that described first inner electrode layer falls into described Part II, and the area that described the second inner electrode layer falls into described Part I is more than or equal to the area that described the second inner electrode layer falls into described Part II.
2. multilayer ceramic capacitor as claimed in claim 1, it is characterized in that, described the first external electrode covers described first surface completely, and the distance that described the first external electrode bends extension one section identical respectively to described 3rd surface, described 4th surface, described 5th surface with described 6th surface forms the first extension;
Described the second external electrode covers described second surface completely, and described the second external electrode bends the identical distance of extension one section respectively to described 3rd surface, described 4th surface, described 5th surface with described 6th surface, form the second extension, the width of described first extension and described second extension is equal.
3. multilayer ceramic capacitor as claimed in claim 2, it is characterized in that, described first inner electrode layer comprises first area and second area;
One end of described first area is connected with described the first external electrode, and the other end of described first area extends to described ceramic body and is connected with described second area;
Described first area is less than the width of described first extension away from one end of described first surface and the distance of described first surface, and the area that described first area falls into described Part I is greater than the area that described first area falls into described Part II;
Described second area is rectangle and six surfaces of described second area and described ceramic body are all formed with gap, described second area is less than the width of described first extension near the distance of one end of described first surface and described first surface, described second area is less than the width of described second extension near the distance of one end of described second surface and described second surface, described second area is less than or equal to described second area one end near described 4th surface and the distance on described 4th surface near the one end on described 3rd surface and the distance on described 3rd surface.
4. multilayer ceramic capacitor as claimed in claim 3, it is characterized in that, described the second inner electrode layer comprises the 3rd region and the 4th region;
The one end in described 3rd region is connected with described the second external electrode, the other end in described 3rd region to described ceramic body extend and with described 4th joint area;
Described 3rd region is less than the width of described second extension away from one end of described second surface and the distance of described second surface, the area that described 3rd region falls into described Part I is more than or equal to the area that described 3rd region falls into described Part II;
Described 4th region is rectangle and six surfaces of described 4th region and described ceramic body are all formed with gap, and the projection of described 4th region on described first inner electrode layer overlaps with described second area.
5. multilayer ceramic capacitor as claimed in claim 4, it is characterized in that, described 3rd region falls in described Part I completely.
6. multilayer ceramic capacitor as claimed in claim 2, it is characterized in that, described first inner electrode layer comprises first area and second area;
One end of described first area is connected with described the first external electrode, and the other end of described first area extends to described ceramic body and is connected with described second area;
Described first area is less than the width of described first extension away from one end of described first surface and the distance of described first surface, and the area that described first area falls into described Part I equals the area that described first area falls into described Part II;
Described second area is rectangle and six surfaces of described second area and described ceramic body are all formed with gap, described second area is less than the width of described first extension near the distance of one end of described first surface and described first surface, described second area is less than the width of described second extension near the distance of one end of described second surface and described second surface, and described second area is less than described second area one end near described 4th surface and the distance on described 4th surface near the one end on described 3rd surface and the distance on described 3rd surface.
7. multilayer ceramic capacitor as claimed in claim 6, it is characterized in that, described the second inner electrode layer comprises the 3rd region and the 4th region;
The one end in described 3rd region is connected with described the second external electrode, the other end in described 3rd region to described ceramic body extend and with described 4th joint area;
Described 3rd region is less than the width of described second extension away from one end of described second surface and the distance of described second surface, the area that described 3rd region falls into described Part I is more than or equal to the area that described 3rd region falls into described Part II;
Described 4th region is rectangle and six surfaces of described 4th region and described ceramic body are all formed with gap, and the projection of described 4th region on described first inner electrode layer overlaps with described second area.
8. multilayer ceramic capacitor as claimed in claim 1, it is characterized in that, described first inner electrode layer and described the second inner electrode layer are nickel inner electrode, and the thickness of described first inner electrode layer and described the second inner electrode layer is equal.
9. the multilayer ceramic capacitor according to any one of claim 1 ~ 8; it is characterized in that; described ceramic body also comprises the first protective layer and the second protective layer that are laminated in described first inner electrode layer and the described relative both sides of the second inner electrode layer; a surface of described first protective layer is described 5th surface, and a surface of described second protective layer is described 6th surface.
10. multilayer ceramic capacitor as claimed in claim 9, it is characterized in that, described first protective layer comprises additional electrode layer, and described additional electrode layer is nickel inner electrode, and the thickness of described additional electrode layer is not less than the thickness of described first inner electrode layer;
The projection of described additional electrode layer on described first inner electrode layer falls into the part that described second area is positioned at described Part I.
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| CN110534343A (en) * | 2019-08-28 | 2019-12-03 | 广东风华高新科技股份有限公司 | A kind of multilayer ceramic capacitor |
| CN115274319A (en) * | 2022-07-18 | 2022-11-01 | 广东风华高新科技股份有限公司 | Preparation method of multilayer ceramic capacitor |
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| CN204480897U (en) * | 2015-03-16 | 2015-07-15 | 广东风华高新科技股份有限公司 | Multilayer ceramic capacitor |
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| CN1405806A (en) * | 2001-08-06 | 2003-03-26 | Tdk株式会社 | Chip type electronic part |
| CN103854855A (en) * | 2012-11-29 | 2014-06-11 | 三星电机株式会社 | Multilayer ceramic electronic component |
| US20140182101A1 (en) * | 2012-12-28 | 2014-07-03 | Murata Manufacturing Co., Ltd. | Method of identifying direction of stacking in stacked ceramic capacitor, apparatus for identifying direction of stacking in stacked ceramic capacitor, and method of manufacturing stacked ceramic capacitor |
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| CN110534343A (en) * | 2019-08-28 | 2019-12-03 | 广东风华高新科技股份有限公司 | A kind of multilayer ceramic capacitor |
| CN115274319A (en) * | 2022-07-18 | 2022-11-01 | 广东风华高新科技股份有限公司 | Preparation method of multilayer ceramic capacitor |
| CN115274319B (en) * | 2022-07-18 | 2024-05-31 | 广东风华高新科技股份有限公司 | Preparation method of multilayer ceramic capacitor |
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