CN108615597A - Inductor - Google Patents
Inductor Download PDFInfo
- Publication number
- CN108615597A CN108615597A CN201710560147.XA CN201710560147A CN108615597A CN 108615597 A CN108615597 A CN 108615597A CN 201710560147 A CN201710560147 A CN 201710560147A CN 108615597 A CN108615597 A CN 108615597A
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- CN
- China
- Prior art keywords
- face
- articulamentum
- main body
- external electrode
- inductor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002184 metal Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000006185 dispersion Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000001465 metallisation Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
- H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2804—Printed windings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/29—Terminals; Tapping arrangements for signal inductances
- H01F27/292—Surface mounted devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/0006—Printed inductances
- H01F2017/0066—Printed inductances with a magnetic layer
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2804—Printed windings
- H01F2027/2809—Printed windings on stacked layers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
The present invention provides a kind of inductor comprising：Main body, including coil, and includes the first face and the second face facing with each other, is connected to the first face and the second face and third face facing with each other and fourth face, be connected to the first face and the second face and be connected to third face and fourth face and the 5th face and the 6th face facing with each other, the both ends of the coil are exposed to the open air by third face and fourth face respectively；First articulamentum and the second articulamentum, the third face for being respectively formed in the main body and the part in fourth face, are connected to the part of the coil exposed to the open air；And first external electrode and the second external electrode, it is respectively formed in third face and the fourth face of the main body, it is covered each by first articulamentum and the second articulamentum, wherein, in first articulamentum and the second articulamentum, thickness (B) meets mathematical expression B/A relative to the ratio B/A of width (A)>0.3.
Description
Technical field
The present invention relates to a kind of inductors.
Background technology
Lightweight with electronic equipment and multifunction, for the small-sized of the electronic unit for being used in this electronic equipment
The necessity of change is also constantly required.
Therefore, for a kind of inductor as electronic unit, it is desirable that improved high current behaviour, but also require to small-sized ruler
Very little micromation (Downsizing).
With the miniaturization of inductor, the quality including the reliability of chip (chip) integrally becomes sensitive, also not
It is easy to control.
Especially, for inductor, the electrical connectivity between coil and external terminal is to determine inductor performance
Key property.
Therefore, the size of inductor is smaller, then to this electrical connectivity the problem of (Issue) also become bigger, therefore want
The design to coil exposed portion is asked to be optimal.
【Look-ahead technique document Prior Art】
【Patent document】
(patent document 1) KR published patent the 2015-0033343rd
Invention content
The purpose of the present invention is to provide a kind of electrical connectivity that can be improved between coil and external electrode and reliably
The inductor of property.
One aspect of the present invention provides a kind of inductor comprising：Main body (body), including coil, and include each other
The first face and the second face that face, connect with the first face and the second face and third face facing with each other and fourth face, with the first face
And second face connect and connect with third face and fourth face and the 5th face and the 6th face facing with each other, the both ends of the coil are divided
It is not exposed to the open air by third face and fourth face；First articulamentum and the second articulamentum, be respectively formed in the main body third face and
A part in fourth face is connected to the part of the coil exposed to the open air；And first external electrode and the second external electrical
Pole is respectively formed in third face and the fourth face of the main body, is covered each by first articulamentum and the second articulamentum,
In, in first articulamentum and the second articulamentum, thickness B meets mathematical expression B/A relative to the ratio B/A of width A>0.3.
An embodiment according to the present invention has the electrical connectivity between coil and external electrode being ensured to be predetermined water
The effect of the reliability of inductor can be improved while flat.
Description of the drawings
Fig. 1 is the solid cut a part for the inductor of an embodiment according to the present invention and schematically shown
Figure.
Fig. 2 is the stepped construction that magnet layer and conductive pattern are shown in the inductor of an embodiment according to the present invention
Exploded perspective view.
Fig. 3 is the I-I' line profiles of Fig. 1.
Fig. 4 is the side view for the fourth face for omitting the external electrode of Fig. 1 and showing main body.
Symbol description
100：Inductor 110：Main body
111：Magnet layer 120：Coil
121、122、123、124、125：Conductive pattern
121a：First leading part 122a：Second leading part
131：First external electrode 132：Second external electrode
140：First articulamentum 150：Second articulamentum
161、162：Cross pore electrod
Specific implementation mode
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
However, the embodiment of the present invention can be deformed into a variety of different forms, the scope of the invention is not limited to
The lower implementation form.
Additionally, it is provided the purpose of the embodiment of the present invention is to be described more fully to those of ordinary skill in the art
The present invention.
For explanation definitely, form and dimension of element etc. may be exaggerated in figure.
In addition, the function or identical composition in the identical thought range shown in figure for each embodiment are wanted
Element is illustrated using identical reference marks.
In addition, throughout the specification, when being recorded as certain inscape of " comprising ", as long as no the note distinguishingly refuted
It carries, then means other inscapes are not precluded but can also include other inscapes.
In addition, be recorded as being formed in throughout the specification " ... on " when, it refers not only to be in direct contact and formed, also refer to
It can also include other inscapes between it, therefore based on context should properly explain.
In addition, in the accompanying drawings, in order to clearly state the present invention, the part unrelated with explanation is omitted, for clear earth's surface
Show various layers and region, its thickness is enlarged and displayed, throughout the specification, has been used about similar part similar attached
Schematic symbol.
Fig. 1 is the solid cut a part for the inductor of an embodiment according to the present invention and schematically shown
Figure, Fig. 2 is the decomposition for the stepped construction that magnet layer and conductive pattern are shown in the inductor of an embodiment according to the present invention
Stereogram, Fig. 3 are the I-I' line profiles of Fig. 1.
Referring to figs. 1 to Fig. 3, the inductor 100 of an embodiment according to the present invention includes：Main body 110；First articulamentum
140 and second articulamentum 150；And first external electrode 131 and the second external electrode 132.
Main body 110 includes coil 120.In addition, in the following description, for convenience of description, by the explanation of main body 110 for by magnetic
Body layer forms, but the material of the main body 110 of the present invention is not limited to magnet, for example, it is also possible to be changed to dielectric layer etc..
The shape of this main body 110 is not particularly restricted, and substantially can be hexahedral shape.
If being defined to hexahedral direction to clearly state the embodiment of the present invention, the X that is indicated on figure,
Y and Z indicates length direction, width direction and thickness direction respectively.
In addition, for convenience of description, two sides facing with each other in the Z-direction of main body 110 is set as the first face 1 and
The two sides of end that is facing with each other in the X direction and connecting the first face 1 and the second face 2 is set as third face 3 and the by two faces 2
On four sides 4, it will be facing with each other in the Y direction and connect the end in the first face 1 and the second face 2 and connect third face 3 and fourth face 4
The two sides of end is set as the 5th face 5 and the 6th face 6.
In addition, the main body 110 of the present embodiment may include upper cover 112 and lower cover 113.
Upper cover 112 and lower cover 113 can be made of material identical with main body 110, for example, can be by magnet
Layer composition.
Upper cover 112 and lower cover 113 embed coil 120 completely in addition to extension, and line is prevented to play
The basic electrical characteristics of circle 120 are due to the effect that is declined by external impact or exterior materials.
The coil 120 of the present embodiment includes：Along multiple conductive patterns 121,122,123,124,125 of Z-direction stacking；It will
Adjacent conductive pattern 121,122,123,124,125 be connected to each other it is multiple cross pore electrods (via electrode) 161,
162。
Conductive pattern 121,122,123,124,125 sharp can with the following method be formed：It will with techniques such as silk-screen printings
Including the electrocondution slurry of conductive metal is printed onto with scheduled thickness on magnet layer 11, or conduction will be included with techniques such as plating
It is first-class that the electrocondution slurry of metal with scheduled thickness is plated to magnet layer 11.
At this point, the conductive metal can be by the groups such as conductive metals or their alloy such as silver-colored (Ag), copper (Cu), nickel (Ni)
At.
Furthermore it is preferred that conductive pattern 121,122 substantially has spiral-shaped structure, but the present invention is not limited thereto, must
When wanting, can be the polygons such as quadrangle, pentagon, hexagon circle, ellipse etc. or can either be formed as irregular
Shape.
In addition, the part being configured in conductive pattern in Z-direction topmost with the lowermost conductive pattern 121,122 can
It is exposed to the open air respectively by the third face 3 of main body 110 and fourth face 4.
It is formed with the first leading part 121a and second for this purpose, can be each extended at the both ends of conductive pattern 121,122 and draws
Line portion 122a, the first leading part 121a and the second leading part 122a are exposed by the third face 3 of main body 110 and fourth face 4 respectively
Dew.
First articulamentum 140 and the second articulamentum 150 can be respectively arranged in third face 3 and the fourth face 4 of main body 110
At least partially.
In the present embodiment, the first articulamentum 140 is included in the multiple magnet layers for being formed with conductive pattern 121,123,124
The part 141,142,143 that 111 third face 3 is formed, the second articulamentum 150 be included in be formed with conductive pattern 122,124,
The part 151,153,152 that the fourth face 4 of 125 multiple magnet layers 111 is formed.
In the present embodiment, it is illustrated that illustrate that the first articulamentum 140 and the second articulamentum 150 are formed in and abut in z-direction
Three magnet layers 111 situation, but the present invention is not limited thereto, when necessary, can also be formed in two adjacent magnets
Layer or more than four magnet layers.
At this point, the width of the first articulamentum 140 and the second articulamentum 150 can be formed as and the first leading part 121a and
Two leading part 122a's is of same size.
The first articulamentum 140 and the second articulamentum 150 that are thusly-formed can be connected to two exposed to the open air of coil 120
End.
That is, in the present embodiment, the first articulamentum 140 and the second articulamentum 150 can respectively with the first leading part 121a
And second leading part 122a exposed to the open air by third face 3 and fourth face 4 part contact by be electrically connected.
First external electrode 131 and the second external electrode 132 are respectively arranged at third face 3 and the fourth face 4 of main body 110.
First external electrode 131 and the second external electrode 132 are covered each by the third face 3 and the 4th for being formed in main body 110
First articulamentum 140 and the second articulamentum 150 in face 4.
In addition, the first external electrode 131 and the second external electrode 132 when necessary can be from the third faces 3 of main body 110 and
It 4 extends to the part in the first face 1, the second face 2, the 5th face 5 and the 6th face 6 on four sides and is formed.
In such a case, it is possible to improve the affixed intensity of the first external electrode 131 and the second external electrode 132, main body
110 the first face 1 or the second face 2 can become attachment face.
Fig. 4 is the side view for the fourth face for omitting the external electrode of Fig. 1 and showing main body.
Fig. 4 shows the fourth face 4 that second articulamentum 150 exposes to the open air in main body 110, but the first articulamentum 140 and second connects
The structure of layer 150 is connect in addition to there is the second articulamentum 150 to be electrically connected with the second external electrode 132 and the first articulamentum 140 and
It is actually more similar except the electrical connection this point difference of one external electrode 131, therefore, be with the second articulamentum 150 below
Benchmark illustrates, but is regarded as including the explanation to the first articulamentum 140.
With reference to Fig. 4, for first articulamentum 140 of the present embodiment and the second articulamentum 150, respective thickness B phases
Mathematical expression B/A can be met for the ratio B/A of width A>0.3.
When the B/A is 0.3 or less, the D.C. resistance Rdc of inductor 100 is integrally improved, with the first external electrode 131
And second the contact area of external electrode 132 be respectively smaller, it is thus possible to will produce electrical connectivity becomes fragile, reliability decrease
The problem of.
In addition, width Ws of the one width A in the first articulamentum 140 or the second articulamentum 150 relative to main body 110
Ratio A/W can meet mathematical expression A/W<0.5.
When the A/W is 0.5 or more, there are problems that the possibility that layering (Delamination) occurs is got higher.
Hereinafter, table 1 indicate be based in the first articulamentum 140 and the second articulamentum 150 thickness B relative to width A
Ratio A/W relative to the width W of main body 110 of ratio B/A and the width A of the first articulamentum 140 or the second articulamentum 150
Whether the electrical connectivity of variation is bad, layering, the variation of impedance (Impedance) and the impedance after metal deposition whether occurs
Change rate.Herein, the impedance rate of change after metal lining is for judging the whether undesirable parameter of the reliability of inductor.
Herein, the size for the inductor applied is that length×width×height is 0.4mm × 0.2mm × 0.2mm,
The lamination number of conductive pattern is 8 in coil.
【Table 1】
With reference to table 1, it is 0.3 hereinafter, the situation that A/W is 0.5 or more that sample 1 to 10, which is B/A, wherein electrical connectivity is bad
300ppm has occurred, 650ppm has occurred in layering.Wherein, have occurred 1ppm indicate one has occurred in 1,000,000 it is bad.
In addition, impedance value shows as being less than 100 Ω, the impedance rate of change maximum after metal deposition shows as 15%.
On the contrary, sample 11 to 20 is the situation that B/A is more than that 0.3, A/W is less than 0.5, wherein electrical connectivity is bad to be had occurred
10ppm is hereinafter, 10ppm or less has occurred in layering.I.e., it is possible to know, in the case of sample 11 to 20, electrical connectivity is good,
The possibility being layered is significantly reduced.
In addition, in sample 11 to 20, impedance value shows as being less than 100 Ω, and the impedance rate of change after metal deposition is maximum
Show as 2%.
Thus, it can be known that according to the inductor of the present embodiment, characteristic and reliability are very good.
Previous inductor, part (hereinafter referred to as exposing terminal to the open air) width that coil exposes to the open air are formed wide so as to, height (or
Thickness) be formed as smaller.
The reason for this is that the conductive pattern for constituting coil is formed by printing, realize that the aspect ratio of conductive pattern is limited at this time,
And in order to improve the electrical connectivity with coil, increase the contact area with external electrode to the maximum extent.As an example,
The entire width of main body can be formed in by exposing terminal to the open air.
But for this structure, the blank (margin) in body width direction becomes smaller, the possibility being layered
It gets higher, hinders the expansion of area coil, this, which may become, makes under impedance and inductance (Inductance) characteristic of inductor
The reason of drop.
In addition, the width for once exposing terminal to the open air becomes larger, exposes terminal to the open air and formed to the corner parts of external electrode, then metal-plated
Liquid is permeated by the marginal portion of thickness and coverage rate (Coverage) relatively weak external electrode, consequently, it is possible to electricity occurs
The problem of characteristic dispersion (dispersion) of sensor declines.Wherein, the characteristic dispersion of inductor refers to the multiple inductors of manufacture
When, the characteristic of each inductor is not centered on averagely.
By above-mentioned table 1 it is found that according to the inductor of the present embodiment, the first leading part 121a of coil 120 and second draws
The aspect ratio (Aspect Ratio) of the sectional area of line portion 122a is higher.
Then, even if reducing the width of the first leading part 121a and the second leading part 122a, can also be formed with it is previous
Expose the identical sectional area of terminal in inductor to the open air, it can be ensured that outside the coil 120 and first of previous inductor phase same level
Electrical connectivity between electrode 131 and the second external electrode 132.
In addition, compared with previous inductor, the blank of the width direction of main body 110 is more ensured relatively, so as to
Occur to be layered undesirable possibility to reduce, has the effect of that the impedance of inductor 100 and inductance characteristic can be improved.
In addition, due to the center side that the first leading part 121a and the second leading part 122a are formed in main body 110, pass through
The marginal portion of first external electrode 131 and the second external electrode 132 prevents the infiltration of metal plating liquid, so as to prevent inductance
The characteristic dispersion of device 100 declines.
The embodiments of the present invention have been described in detail above, but the interest field of the present invention is not limited thereto, this
The those skilled in the art in field should understand can in the range of not departing from the technological thought of the present invention of claims record
To carry out various modifications and deform.
Claims (5)
1. a kind of inductor, including：
Main body, including coil, and include the first face and the second face facing with each other, be connected to first face and second face
And it third face and fourth face facing with each other, is connected to first face and second face and is connected to the third face and institute
State fourth face and the 5th face and the 6th face facing with each other, the both ends of the coil pass through the third face and the described 4th respectively
It exposes to the open air in face；
First articulamentum and the second articulamentum are respectively formed in the third face of the main body and one in the fourth face
Point, it is connected to the part of the coil exposed to the open air；And
First external electrode and the second external electrode are respectively formed in the third face of the main body and the fourth face, point
First articulamentum and second articulamentum are not covered,
In first articulamentum and second articulamentum, thickness (B) meets mathematical expression relative to the ratio B/A of width (A)
B/A>0.3。
2. inductor according to claim 1, wherein
The width (A) of first articulamentum and second articulamentum is full relative to the ratio A/W of the width (W) of the main body
Sufficient mathematical expression A/W<0.5.
3. inductor according to claim 1, wherein
The coil includes multiple conductive patterns, and the first leading part and the second leading part are formed in the multiple conductive pattern
At least one, first leading part and second leading part pass through the third face of the main body and the described 4th respectively
It exposes to the open air in face.
4. inductor according to claim 3, wherein
The width of first leading part and second leading part is formed as connecting with first articulamentum and described second
Layer it is of same size.
5. inductor according to claim 1, wherein
First external electrode and second external electrode are respectively from the third face of the main body and the fourth face
It extends to the part in first face, second face, the 5th face and the 6th face and is formed.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020160169800A KR20180068149A (en) | 2016-12-13 | 2016-12-13 | Inductor |
| KR10-2016-0169800 | 2016-12-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108615597A true CN108615597A (en) | 2018-10-02 |
Family
ID=62806972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710560147.XA Pending CN108615597A (en) | 2016-12-13 | 2017-07-11 | Inductor |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR20180068149A (en) |
| CN (1) | CN108615597A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20200062748A (en) | 2018-11-27 | 2020-06-04 | 삼성전기주식회사 | Coil electronic component |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001093745A (en) * | 1999-09-27 | 2001-04-06 | Tdk Corp | Laminated chip component |
| JP2013219295A (en) * | 2012-04-12 | 2013-10-24 | Panasonic Corp | Common mode noise filter |
| JP2016032093A (en) * | 2014-07-29 | 2016-03-07 | サムソン エレクトロ−メカニックス カンパニーリミテッド． | Chip electronic component and mounting substrate of the same |
| CN106169352A (en) * | 2015-05-19 | 2016-11-30 | 新光电气工业株式会社 | Inducer and the manufacture method of inducer |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102016483B1 (en) | 2013-09-24 | 2019-09-02 | 삼성전기주식회사 | Inductor |
-
2016
- 2016-12-13 KR KR1020160169800A patent/KR20180068149A/en active Search and Examination
-
2017
- 2017-07-11 CN CN201710560147.XA patent/CN108615597A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001093745A (en) * | 1999-09-27 | 2001-04-06 | Tdk Corp | Laminated chip component |
| JP2013219295A (en) * | 2012-04-12 | 2013-10-24 | Panasonic Corp | Common mode noise filter |
| JP2016032093A (en) * | 2014-07-29 | 2016-03-07 | サムソン エレクトロ−メカニックス カンパニーリミテッド． | Chip electronic component and mounting substrate of the same |
| CN106169352A (en) * | 2015-05-19 | 2016-11-30 | 新光电气工业株式会社 | Inducer and the manufacture method of inducer |
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| Publication number | Publication date |
|---|---|
| KR20180068149A (en) | 2018-06-21 |
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