WO2014098084A1 - Esd保護デバイス - Google Patents
Esd保護デバイス Download PDFInfo
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- WO2014098084A1 WO2014098084A1 PCT/JP2013/083767 JP2013083767W WO2014098084A1 WO 2014098084 A1 WO2014098084 A1 WO 2014098084A1 JP 2013083767 W JP2013083767 W JP 2013083767W WO 2014098084 A1 WO2014098084 A1 WO 2014098084A1
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- discharge
- protection device
- esd protection
- cavity
- discharge electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T2/00—Spark gaps comprising auxiliary triggering means
- H01T2/02—Spark gaps comprising auxiliary triggering means comprising a trigger electrode or an auxiliary spark gap
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/12—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances ceramics
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T4/00—Overvoltage arresters using spark gaps
- H01T4/10—Overvoltage arresters using spark gaps having a single gap or a plurality of gaps in parallel
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
- H01T4/00—Overvoltage arresters using spark gaps
- H01T4/10—Overvoltage arresters using spark gaps having a single gap or a plurality of gaps in parallel
- H01T4/12—Overvoltage arresters using spark gaps having a single gap or a plurality of gaps in parallel hermetically sealed
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/06—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using spark-gap arresters
Definitions
- the present invention relates to an ESD protection device including at least one pair of discharge electrodes opposed via a cavity formed in a ceramic laminate.
- FIG. 10 shows a conventional ESD protection device 1000 described in Patent Document 1.
- 10A is a cross-sectional view of the ESD protection device 1000
- FIG. 10B is a cross-sectional view taken along the line II of the ESD protection device 1000 in FIG. 10A.
- the ESD protection device 1000 includes a ceramic laminate 101 in which a plurality of ceramic layers are laminated. A cavity 102 is formed inside the ceramic laminate 101.
- a pair of discharge electrodes 103 and 103 are disposed between the plurality of ceramic layers.
- Each of the pair of discharge electrodes 103, 103 has one main surface and the other main surface, and four end surfaces 103a, 103a connecting the one main surface and the other main surface.
- One end surface 103 a of one discharge electrode 103 of the pair of discharge electrodes 103, 103 and one end surface 103 a of the other discharge electrode 103 are opposed to each other through the cavity 102.
- External electrodes 105 and 105 connected to the discharge electrodes 103 and 103 are formed on the surface of the ceramic laminate 101.
- the other main surface side of the pair of discharge electrodes 103 and 103 and the bottom surface of the cavity portion 102 are integrally formed over the region 102 a between the opposing end surfaces 103 a and 103 a of the pair of discharge electrodes 103 and 103, from metal.
- a discharge auxiliary electrode 104 including a conductive material and an insulating material made of ceramic is formed. The portions exposed to the cavity 102 of the discharge electrodes 103 and 103 are joined to the discharge auxiliary electrode 104 only on the other main surface.
- the ESD protection device 1000 is used by being disposed, for example, between a signal line of a circuit and the ground.
- a voltage that causes dielectric breakdown between the pair of discharge electrodes 103 and 103 (voltage higher than the discharge start voltage) is applied, a discharge occurs between the discharge electrodes 103 and 103 in the cavity 102, and the discharge causes excessive discharge.
- the voltage can be guided to the ground, and the subsequent circuit can be protected.
- the portion exposed to the cavity 102 of the discharge electrodes 103 and 103 is easily peeled off from the discharge auxiliary electrode 104 due to an impact applied at the time of discharge. There was a problem that it might change.
- An object of the present invention is to provide an ESD protection device that operates with a discharge start voltage as low as that of the prior art and has a small change in discharge start voltage due to repeated discharge.
- an ESD protection device of the present invention includes a ceramic laminate in which a plurality of ceramic layers are laminated, a cavity formed inside the ceramic laminate, and the ceramic layers. At least one having a first main surface and the other main surface, a plurality of end surfaces connecting the one main surface and the other main surface, and a corner portion connecting adjacent end surfaces of the plurality of end surfaces.
- One end face of the discharge electrode is an ESD protection device facing through the cavity, and the cavity is a region between the facing end faces, the facing end face and the corner portion. Region along the other end face connected through, and is characterized in that it is formed integrally with the other hand on the main surface, the area along the region and the another end face along the end face of the opposite.
- an ESD protection device that operates with a discharge start voltage as low as that of the prior art and has a small change in discharge start voltage due to repeated discharge.
- FIG. 1A is a cross-sectional view of an ESD protection device 100 according to the first embodiment of the present invention.
- FIG. 1B is a cross-sectional view taken along the line II of the ESD protection device 100 in FIG.
- FIG. 2 is a cross-sectional view of Comparative Example 1 of the ESD protection device 100 according to the first embodiment of the present invention.
- FIG. 3 is a cross-sectional view of Comparative Example 2 of the ESD protection device 100 according to the first embodiment of the present invention.
- FIG. 4 is a cross-sectional view of a modified example of the ESD protection device 100 according to the first embodiment of the present invention.
- FIG. 5 is a cross-sectional view of an ESD protection device 500 according to the second embodiment of the present invention.
- FIG. 6 is a cross-sectional view of Comparative Example 3 of the ESD protection device 500 according to the second embodiment of the present invention.
- FIG. 7 is a cross-sectional view of Comparative Example 4 of the ESD protection device 500 according to the second embodiment of the present invention.
- FIG. 8 is a cross-sectional view of a first modification of the ESD protection device 500 according to the second embodiment of the present invention.
- FIG. 9 is a cross-sectional view of a second modification of the ESD protection device 500 according to the second embodiment of the present invention.
- FIG. 10 is a cross-sectional view of a conventional ESD protection device 1000.
- FIG. 1 shows an ESD protection device 100 according to a first embodiment of the present invention.
- FIG. 1A is a cross-sectional view of the ESD protection device 100.
- FIG. 1B is a cross-sectional view taken along the line II of the ESD protection device 100 in FIG.
- the ESD protection device 100 includes a cuboid ceramic laminate 1 in which a plurality of ceramic layers are laminated.
- the ceramic laminate 1 is made of, for example, a BaO—Al 2 O 3 —SiO 2 low temperature sintered ceramic material (hereinafter referred to as a BAS material).
- a pair of rectangular parallelepiped discharge electrodes 3 and 3 are disposed between the plurality of ceramic layers.
- Each of the pair of discharge electrodes 3, 3 includes one main surface and the other main surface, four end surfaces 3a connecting the one main surface and the other main surface, and four end surfaces adjacent to each other among the four end surfaces 3a. And two corner portions 3b.
- the discharge electrodes 3 and 3 are made of a conductive material such as Cu, for example.
- the discharge auxiliary electrode 4 includes, for example, a conductive material such as alumina-coated Cu particles and a semiconductor material made of ceramic such as SiC.
- External electrodes 5 and 5 connected to the discharge electrodes 3 and 3 are formed on the surface of the ceramic laminate 1.
- the external electrodes 5 and 5 are made of Ag, for example.
- a hollow portion 2 is formed inside the ceramic laminate 1.
- One end surface 3 a of one discharge electrode 3 of the pair of discharge electrodes 3, 3 and one end surface 3 a of the other discharge electrode 3 are opposed to each other through the cavity 2.
- the cavity 2 is a region 2a between the opposing end faces 3a, 3a of the pair of discharge electrodes 3, 3, another end face connected through the opposing end faces 3a, 3a and the corners 3b, 3b, 3b, 3b.
- the discharge electrodes 3 and 3 are made of a conductive material such as Cu
- the discharge auxiliary electrode 4 is made of a material obtained by mixing a conductive material such as Cu and a semiconductor material made of ceramic such as SiC. Therefore, the discharge electrodes 3 and 3 and the discharge auxiliary electrode 4 are made of different materials, so that the bondability is poor, and the discharge electrodes 3 and 3 exposed to the cavity 2 are easily peeled off from the discharge auxiliary electrode 4 due to impact during discharge. .
- the area of the ceramic laminate 1 on the discharge electrodes 3 and 3 is formed so as to leave the U-shaped region 3e along the other end faces 3c and 3c as the cavity 2, and the cavity of the discharge electrodes 3 and 3 is formed.
- the area of the part exposed to the part 2 is reduced. Therefore, the discharge electrodes 3 and 3 are suppressed from being peeled off from the auxiliary discharge electrode 4 due to the impact during discharge, and the change in the discharge start voltage due to repeated discharge can be reduced.
- the side connecting the opposite end surfaces 3a, 3a and the U-shaped regions 3e, 3e, the other end surfaces 3c, 3c, 3c and the U-shaped regions 3e, 3e are connected.
- the shape of the cavity 2 is conventionally set so that the periphery of the sides and the portions of the discharge electrodes 3 and 3 that are likely to generate discharge, such as the corners 3b, 3b, 3b, and 3b, are left as exposed portions of the cavity 2. Therefore, it is possible to maintain the discharge start voltage as low as the conventional one.
- the ESD protection device 100 can reduce a change in the discharge start voltage due to repeated discharges while maintaining a discharge start voltage as low as the conventional one. it can.
- the boundary between the ceramic laminate 1 and one main surface of the discharge electrodes 3, 3 exposed in the cavity 2 is U-shaped. Since the shape of the boundary is not a straight line but a U-shape, when the ESD protection device 100 is mounted on the substrate by reflow, the force applied to the ceramic laminate 1 due to the thermal expansion of the gas in the cavity 2 is dispersed. Thus, the ceramic laminate 1 is unlikely to peel off from the one main surface side of the discharge electrodes 3 and 3.
- the BAS material is formed by mixing and mixing each material centered on Ba, Al, and Si at a predetermined ratio and calcining at 800 to 1000 ° C.
- the obtained BAS material is pulverized by a zirconia ball mill to form a ceramic material made of the BAS material having an average particle size of about 1 to 2 ⁇ m.
- An organic solvent such as toluene or echinene is added to the ceramic material and mixed. Thereafter, a binder and a plasticizer are added and mixed to form a slurry.
- the slurry is formed by the doctor blade # method to form a plurality of ceramic green sheets having a thickness of 10 to 50 ⁇ m.
- a discharge auxiliary electrode forming paste containing a conductive material and a semiconductor material is formed.
- a ceramic material composed of alumina-coated Cu particles having an average particle size of about 3 to 10 ⁇ m and SiC particles having an average particle size of about 1 to 2 ⁇ m is prepared at a predetermined ratio, a binder resin and a solvent are added, and 3 By stirring and mixing with this roll, a discharge auxiliary electrode forming paste is formed.
- an unfired discharge auxiliary electrode 4 is formed by applying a discharge auxiliary electrode forming paste by screen printing on one main surface of the ceramic green sheet.
- a solvent is added to a binder resin composed of Cu powder and ethyl cellulose, and the mixture is stirred and mixed with three rolls to form a discharge electrode forming paste.
- an unfired pair of discharge electrodes 3 and 3 is formed by applying a discharge electrode forming paste by screen printing.
- a plurality of ceramic green sheets are laminated in a predetermined order and pressed to form a ceramic laminate 1 in which the resin paste, the discharge electrodes 3 and 3 and the discharge auxiliary electrode 4 are laminated inside.
- the ceramic laminate 1 is divided by cutting using a micro cutter.
- the divided ceramic laminate 1 is fired in an N 2 atmosphere.
- the resin paste disappears and the cavity 2 is formed.
- a plurality of external electrodes 5 and 5 electrically connected to the discharge electrodes 3 and 3 are formed by applying and baking a conductive paste containing Ag or the like on the surface of the ceramic laminate 1.
- an ESD protection device 100 as shown in FIG. 1 is completed by forming a film made of Ni and Sn on the external electrodes 5 and 5 by electrolytic plating.
- the initial discharge start voltage and the discharge start voltage after repeated discharge were evaluated for the ESD protection device 100 according to the first embodiment of the present invention.
- the discharge start voltage was measured by an electrostatic discharge immunity test defined in IEC61000-4-2. Specifically, 8 kV was applied to the ESD protection device by contact discharge, and the peak voltage detected on the protection circuit side was taken as the discharge start voltage.
- the discharge starting voltage after repeated discharge was a peak voltage measured by the same method as described above after applying 8 kV to the ESD protection device 100 times by contact discharge.
- Example 1 having the same structure as that of the ESD protection device 100 according to the first embodiment of the present invention was produced by the same method as the manufacturing method described above. Moreover, as a comparison object with Example 1, by changing the coating pattern of the resin paste with respect to Example 1, the ESD protection device 200 of Comparative Example 1, which is different from Example 1 only in the shape and dimensions of the cavity, An ESD protection device 300 of Comparative Example 2 was produced.
- Comparative Example 1 as shown in FIG. 2, a rectangular cavity portion 22 was formed when viewed in plan, as in the prior art (Patent Document 1) shown in FIG.
- Patent Document 1 shown in Comparative Example 2
- Comparative Example 2 as shown in FIG. 3, a rectangular cavity 32 having a smaller lateral width than the cavity 22 of Comparative Example 1 was formed when viewed in plan.
- Table 1 shows the measurement results of the discharge start voltages of Example 1, Comparative Example 1, and Comparative Example 2.
- Example 1 As can be seen from Table 1, the change in the initial discharge start voltage in Example 1 due to repetitive discharge is smaller than that in Comparative Example 1 of the prior art. Further, in Example 1, the initial discharge start voltage is kept smaller than that in Comparative Example 1. That is, in Example 1, while maintaining the initial discharge start voltage as low as that of the prior art, the change in the discharge start voltage due to repeated discharge can be reduced as compared with Comparative Example 1 of the prior art. Yes.
- Comparative Example 2 in which the width of the rectangular cavity is narrower than that in Comparative Example 1, the change in the discharge start voltage due to repeated discharge is smaller than that in Comparative Example 1, but the initial discharge start voltage is compared. There is a problem that it becomes larger than Example 1.
- Example 1 the change of the discharge start voltage due to the repetition of discharge is made smaller than that of Comparative Example 1, and the initial discharge start voltage can be maintained as low as that of Comparative Example 1.
- FIG. 4 shows a cross-sectional view of a modified example 400 of the ESD protection device 100 according to the first embodiment of the present invention.
- the modified example 400 is different from the ESD protection device 100 described above, in each of the pair of discharge electrodes 43, 43, another end surface connected to the opposite end surfaces 43a, 43a via the corner portions 43b, 43b, 43b, 43b. 43c, 43c, 43c, and 43c are formed so as to spread as they move away from the opposed end surfaces 43a and 43a when viewed in plan. Even in this case, it is possible to reduce the change in the discharge start voltage due to the repetition of discharge while maintaining the same low discharge start voltage as before.
- the discharge auxiliary electrode 4 is formed, but the discharge auxiliary electrode 4 may not be formed. Even when the auxiliary discharge electrode 4 is not formed, the discharge electrodes 3 and 3 and the ceramic laminate 4 to be joined are made of different materials, and therefore the discharge electrodes 3 and 3 are easily peeled off from the ceramic laminate 4. Therefore, even in this case, it is meaningful to apply the present invention.
- the shape of the cavity 2 is the same as that of the present invention, so that the discharge start voltage due to repeated discharge is maintained while maintaining the same low discharge start voltage as before. Change can be reduced.
- FIG. 5 shows a cross-sectional view of an ESD protection device 500 according to the second embodiment of the present invention.
- the end surfaces 3a and 3a on the short side of the pair of rectangular discharge electrodes 3 and 3 are opposed to each other when viewed in a plan view.
- part of the long side end surfaces 53a and 53a of the pair of rectangular discharge electrodes 53 and 53 are opposed to each other.
- the corner portions 3 b, 3 b, 3 b, 3 b of the opposing end surfaces 3 a, 3 a have two for each of the pair of discharge electrodes 3, 3, but in the ESD protection device 500, 1 One pair is provided for each of the pair of discharge electrodes 53 and 53.
- the cavity 2 is formed in a U-shaped region on one main surface of the discharge electrodes 3, 3, but in the ESD protection device 500, the cavity 52 is L-shaped. It is formed in the area.
- the corner portions 3b and 3b are directly opposed to each other.
- the corner portions 53b and 53b are not directly opposed to each other, and the corner portion 53b and the end surface 53a are opposed to each other. Yes.
- the opposing end faces 53a and 53a are arranged in parallel with the longitudinal direction of the rectangular ceramic laminate 51 when viewed in plan, as shown in FIG. Therefore, by setting the length of the facing portions 53a and 53a to be longer, the facing length of the facing discharge electrodes 53 and 53 can be increased, so that the ESD protection device 500 can be used repeatedly. The number of times can be increased.
- the corner part 53b and the end surface 53a are made to oppose, compared with the case where the corner parts 3b and 3b are made to oppose like the ESD protection device 100, printing deviation etc.
- the discharge start voltage can be stabilized against variations in the positions of the discharge electrodes 3 and 3 due to the above.
- the same method as the manufacturing method of the ESD protection device 100 of the first embodiment can be used.
- the difference between the manufacturing method of the first embodiment and the manufacturing method of the second embodiment is that the shape in which the resin paste is applied, the shape in which the discharge electrode paste is applied, the shape of the cavity 52 and the discharge electrodes 53, 53. Is changed to match.
- the discharge start voltage was evaluated in the same manner as the ESD protection device 100 of the first embodiment.
- Example 2 having the same structure as that of the ESD protection device 500 according to the second embodiment of the present invention was produced.
- Example 2 by changing the coating pattern of the resin paste and the discharge electrode paste with respect to Example 2, only the shape and dimensions of the cavity and the discharge electrode are different from Example 1.
- the ESD protection device 600 of Example 3 and the ESD protection device 700 of Comparative Example 4 were produced.
- Comparative Example 3 a rectangular cavity 62 was formed as shown in FIG.
- Comparative Example 4 as shown in FIG. 7, a rectangular cavity 72 having a smaller vertical width than the cavity 22 of Comparative Example 3 was formed.
- Table 2 shows the measurement results of the discharge start voltages of Example 2, Comparative Example 3, and Comparative Example 4.
- Example 2 As can be seen from Table 2, in Example 2, as in Example 1, the initial discharge start voltage is kept as low as the conventional one, and the change in the discharge start voltage is reduced compared to Comparative Example 3. Is able to.
- FIGS. 8 and 9 are cross-sectional views of a first modification 800 and a second modification 900 of the ESD protection device 500 according to the second embodiment of the present invention, respectively.
- the first modified example 800 is connected to each of the pair of discharge electrodes 83 and 83 through opposing end faces 83a and 83a and corner portions 83b, 83b, 83b, and 83b.
- the other end faces 83c, 83c, 83c, 83c are formed so as to expand as they are separated from the opposing end faces 83a, 83a when viewed in plan.
- the tip portion including the opposing end faces 93a, 93a of the discharge electrodes 93, 93 has a parallelogram shape when viewed in plan.
Abstract
Description
図1に、本発明の第1の実施形態にかかるESD保護デバイス100を示す。図1(A)は、ESD保護デバイス100の断面図である。図1(B)は、図1(A)におけるESD保護デバイス100のI-I線断面図である。
(第2の実施形態)
図5に、本発明の第2の実施形態にかかるESD保護デバイス500の断面図を示す。
2 空洞部
2a 1対の放電電極の対向する端面の間の領域
2c 1対の放電電極の別の端面に沿う領域
3 放電電極
3a 放電電極の対向する端面
3b 放電電極のコーナー部
3c 放電電極の別の端面
3e 放電電極の一方主面上の領域
4 放電補助電極
5 外部電極
100、400、500、800、900 ESD保護デバイス
Claims (3)
- 複数のセラミック層が積層されてなるセラミック積層体と、
前記セラミック積層体の内部に形成された空洞部と、
前記複数のセラミック層間に配置され、一方主面および他方主面と、前記一方主面と前記他方主面をつなぐ複数の端面と、前記複数の端面のうちの互いに隣接する端面をつなぐコーナー部とを有する、少なくとも1対の放電電極と、
前記セラミック積層体の表面に形成され、前記放電電極と接続された外部電極とを備え、
前記1対の放電電極のうちの一方の放電電極の1つの端面と、他方の放電電極の1つの端面とが、前記空洞部を介して対向するESD保護デバイスであって、
前記空洞部が、前記対向する端面の間の領域、前記対向する端面と前記コーナー部を介してつながれた別の端面に沿う領域、ならびに、前記一方主面上の、前記対向する端面に沿う領域および前記別の端面に沿う領域に一体に形成されていることを特徴とするESD保護デバイス。 - 前記1対の放電電極の前記他方主面側および、前記空洞部の底面であって、前記1対の放電電極の前記対向する端面の間の領域に、導電性材料と、半導体材料および絶縁性材料のうちの少なくとも一方とを含む放電補助電極が形成されていることを特徴とする請求項1に記載されたESD保護デバイス。
- 前記1対の放電電極のそれぞれにおいて、前記空洞部に露出した前記一方主面の形状は、L字状であることを特徴とする請求項1または2に記載されたESD保護デバイス。
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CN201390000997.XU CN204947322U (zh) | 2012-12-19 | 2013-12-17 | Esd保护器件 |
JP2014553156A JP5757372B2 (ja) | 2012-12-19 | 2013-12-17 | Esd保護デバイス |
US14/723,852 US9837795B2 (en) | 2012-12-19 | 2015-05-28 | ESD protection device |
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KR20160029985A (ko) * | 2014-09-05 | 2016-03-16 | 성균관대학교산학협력단 | 유전체에 균일하게 플라즈마를 발생시키는 방법 |
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JP2002093546A (ja) * | 2000-07-10 | 2002-03-29 | Samsung Electro Mech Co Ltd | 表面実装型静電気放電装置及びその製造方法 |
WO2011145598A1 (ja) * | 2010-05-20 | 2011-11-24 | 株式会社村田製作所 | Esd保護デバイス |
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WO2016098623A1 (ja) * | 2014-12-18 | 2016-06-23 | 株式会社村田製作所 | Esd保護装置およびその製造方法 |
JPWO2016098623A1 (ja) * | 2014-12-18 | 2017-05-25 | 株式会社村田製作所 | Esd保護装置およびその製造方法 |
CN107005028A (zh) * | 2014-12-18 | 2017-08-01 | 株式会社村田制作所 | Esd保护装置以及其制造方法 |
US10381806B2 (en) | 2014-12-18 | 2019-08-13 | Murata Manufacturing Co., Ltd. | ESD protection device and manufacturing method for same |
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CN204947322U (zh) | 2016-01-06 |
JPWO2014098084A1 (ja) | 2017-01-12 |
US20150263489A1 (en) | 2015-09-17 |
US9837795B2 (en) | 2017-12-05 |
JP5757372B2 (ja) | 2015-07-29 |
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