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JP2017069293A - Electronics - Google Patents

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Publication number
JP2017069293A
JP2017069293A JP2015190543A JP2015190543A JP2017069293A JP 2017069293 A JP2017069293 A JP 2017069293A JP 2015190543 A JP2015190543 A JP 2015190543A JP 2015190543 A JP2015190543 A JP 2015190543A JP 2017069293 A JP2017069293 A JP 2017069293A
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Prior art keywords
housing
substrate
signal ground
mounting substrate
insulating
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JP2015190543A
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JP6616992B2 (en
Inventor
輝男 垣谷
Teruo Kakiya
輝男 垣谷
日出樹 長谷
Hideki Hase
日出樹 長谷
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Contec Co Ltd
Mitsubishi Logisnext Co Ltd
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Mitsubishi Nichiyu Forklift Co Ltd
Contec Co Ltd
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Priority to JP2015190543A priority Critical patent/JP6616992B2/en
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Abstract

PROBLEM TO BE SOLVED: To suppress influence of external noises on an electronic component mounted on a substrate.SOLUTION: By insulating a signal ground of a mounting substrate 2 and a frame ground of a housing 3, it is possible to prevent the external noises input to the frame ground from being mixed into the signal ground and to suppress influence of external noises on an electronic component 4 mounted on the mounting substrate 2.SELECTED DRAWING: Figure 1

Description

電子部品が実装される基板を備える電子機器に関する。   The present invention relates to an electronic device including a substrate on which electronic components are mounted.

コンピュータや産業用機器等の電子機器は、一般に筐体を備え、電子部品が実装される基板が筐体内に配置される。電子部品は、動作電圧を供給する電源と、基準電圧を供給するグランドとが接続されて動作する。基板には、電源配線とシグナルグランドであるシグナルグランド配線とが配線され、それぞれの電子部品に共通の電源とグランドを供給する。電子部品はノイズにより誤動作を起こしやすく、グランドを強化するために、フレームグランドであって通常接地電圧に保持されている筐体とシグナルグランドとを接続する場合があった。   Electronic devices such as computers and industrial devices generally include a housing, and a substrate on which electronic components are mounted is disposed in the housing. The electronic component operates by connecting a power source that supplies an operating voltage and a ground that supplies a reference voltage. A power supply wiring and a signal ground wiring which is a signal ground are wired on the substrate, and a common power supply and ground are supplied to each electronic component. Electronic components are liable to malfunction due to noise, and in order to strengthen the ground, there is a case where a frame ground, which is a normal ground voltage, is connected to a signal ground.

特開平9−23083号公報JP-A-9-23083

しかしながら、電子機器は、工場内や車両等の電磁波の影響の強い環境で使用されることがあり、このような環境では筐体自体がノイズを受信するアンテナとして機能し、基板のシグナルグランドと筐体を接続していると、筐体に入力されたノイズが基板のシグナルグランドに混入し、かえって電子部品の誤動作を引き起こす場合があった。   However, electronic devices are sometimes used in environments where there is a strong influence of electromagnetic waves, such as in a factory or a vehicle. In such an environment, the housing itself functions as an antenna that receives noise, and the signal ground of the substrate and the housing. When the body is connected, the noise input to the housing is mixed into the signal ground of the board, which may cause malfunction of the electronic component.

本発明は、基板に実装された電子部品に及ぼす外部ノイズの影響を抑制することを目的とする。   An object of the present invention is to suppress the influence of external noise on an electronic component mounted on a substrate.

本発明の一実施形態にかかる電子機器は、筐体と、電子部品が実装されて前記筐体の内部に搭載される実装基板と、前記実装基板に設けられるシグナルグランド配線と、前記筐体と前記シグナルグランド配線とを電気的に絶縁する絶縁部材とを有することを特徴とする。   An electronic device according to an embodiment of the present invention includes a housing, a mounting substrate on which electronic components are mounted and mounted inside the housing, a signal ground wiring provided on the mounting substrate, and the housing. It has an insulating member which electrically insulates from the signal ground wiring.

以上のように、基板のシグナルグランドと筐体のフレームグランドとを絶縁することにより、フレームグランドに入力された外部ノイズがシグナルグランドに混入することを防止し、基板に実装された電子部品に及ぼす外部ノイズの影響を抑制することができる。   As described above, by isolating the signal ground of the board from the frame ground of the housing, external noise input to the frame ground is prevented from entering the signal ground, and it affects electronic components mounted on the board. The influence of external noise can be suppressed.

電子機器の筐体内部の概略構成を説明する分解斜視図Exploded perspective view explaining the schematic configuration inside the housing of the electronic device 筐体内に設置される実装基板の概略構成を例示する斜視図The perspective view which illustrates schematic structure of the mounting substrate installed in a housing | casing 絶縁スペーサの構成を例示する図Diagram illustrating the configuration of the insulating spacer 絶縁ブッシュの構成を例示する図Diagram illustrating the configuration of the insulation bush 絶縁ガスケットの構成を例示する図Diagram illustrating the configuration of an insulation gasket

グランドが分離された電子部品について図1〜図5を用いて説明する。
図1は電子機器の筐体内部の概略構成を説明する分解斜視図、図2は筐体内に設置される実装基板の概略構成を例示する斜視図、図3は絶縁スペーサの構成を例示する図、図4は絶縁ブッシュの構成を例示する図、図5は絶縁ガスケットの構成を例示する図である。
The electronic component from which the ground is separated will be described with reference to FIGS.
FIG. 1 is an exploded perspective view illustrating a schematic configuration inside the casing of the electronic device, FIG. 2 is a perspective view illustrating a schematic configuration of a mounting board installed in the casing, and FIG. 3 is a diagram illustrating a configuration of an insulating spacer. 4 is a diagram illustrating the configuration of the insulating bush, and FIG. 5 is a diagram illustrating the configuration of the insulating gasket.

コンピュータや産業用機器等の電子機器1は、電子部品4が実装された実装基板2が筐体3内に配置されている。筐体3内には、さらに筐体基板5が配置されていても良い。実装基板2は筐体基板5上に配置されても良く、筐体基板5は実装基板2以外の部品を搭載しても良い。また、筐体3の一面はコネクタ面6とすることもでき、コネクタ面6はUSB端子やLAN端子,電源端子等の各種端子7が配設される。   In an electronic device 1 such as a computer or an industrial device, a mounting substrate 2 on which an electronic component 4 is mounted is disposed in a housing 3. A housing substrate 5 may be further disposed in the housing 3. The mounting substrate 2 may be disposed on the housing substrate 5, and the housing substrate 5 may mount components other than the mounting substrate 2. Further, one surface of the housing 3 can be a connector surface 6, and the connector surface 6 is provided with various terminals 7 such as a USB terminal, a LAN terminal, and a power supply terminal.

実装基板2は、電子部品4が実装され、基準電圧であるグランドと電源電圧とが外部から供給される。実装基板2に供給されたグランドはシグナルグランドと称され、シグナルグランド配線8を介して各電子部品4に供給される。シグナルグランド配線8は実装基板2内の全面に引き回されても良い。従来の実装基板は、導電性の金属スペーサ10等で筐体3に固定される。実装基板2のネジ留めされる領域には導電性のランド9が形成され、ランド9はシグナルグランド配線8と導通される。従来の実装基板は、導電性の金属スペーサ10等で筐体3に固定され、ネジ留めされる領域にシグナルグランド配線8と導通されるランド9が形成されるため、シグナルグランド配線8と筐体3とが電気的に導通される。通常、筐体3の電位はフレームグランドと称される。そのため、従来の電子機器では、シグナルグランドとフレームグランドは同電位となっている。本発明の電子機器1は、筐体3とシグナルグランド配線8との間に絶縁部材を挿入することにより、シグナルグランドとフレームグランドとを絶縁することができることが特徴である。シグナルグランドとフレームグランドとを絶縁することにより、工場内や車両等の電磁波の影響の強い環境下で電子機器1を使用し筐体3にノイズが印加されたとしても、シグナルグランドにノイズが伝播されることが防止され、基板に実装された電子部品に及ぼす外部ノイズの影響を抑制することができる。   The mounting substrate 2 is mounted with the electronic component 4 and is supplied with a ground and a power supply voltage as reference voltages from the outside. The ground supplied to the mounting substrate 2 is called a signal ground, and is supplied to each electronic component 4 via the signal ground wiring 8. The signal ground wiring 8 may be routed over the entire surface of the mounting substrate 2. A conventional mounting substrate is fixed to the housing 3 with a conductive metal spacer 10 or the like. A conductive land 9 is formed in a region to be screwed on the mounting substrate 2, and the land 9 is electrically connected to the signal ground wiring 8. Since the conventional mounting substrate is fixed to the housing 3 with a conductive metal spacer 10 or the like, and a land 9 is formed in a region to be screwed, the land 9 connected to the signal ground wire 8 is formed. 3 is electrically connected. Usually, the potential of the housing 3 is referred to as a frame ground. Therefore, in the conventional electronic device, the signal ground and the frame ground are at the same potential. The electronic device 1 of the present invention is characterized in that the signal ground and the frame ground can be insulated by inserting an insulating member between the housing 3 and the signal ground wiring 8. By insulating the signal ground from the frame ground, even if noise is applied to the housing 3 using the electronic device 1 in an environment where the influence of electromagnetic waves is strong, such as in a factory or a vehicle, the noise propagates to the signal ground. And the influence of external noise on the electronic component mounted on the board can be suppressed.

従来の電子機器における実装基板を筐体に固定する金属スペーサ10に代わり、図3に示すように、本発明の電子機器1では、絶縁部材の一実施形態である絶縁性のスペーサ、例えば絶縁性の樹脂スペーサ11と金属スペーサ12とを用いる。樹脂スペーサ11は、実装基板2のランド9に形成されたネジ穴13にネジ留めされる。樹脂スペーサ11は上部にネジ穴が形成され、このネジ穴に金属スペーサ12がネジ留めされる。ネジ留めされた状態の樹脂スペーサ11と金属スペーサ12とを合わせた長さは、金属スペーサ10の長さと一致する。金属スペーサ12上に筐体3を被せ、筐体3を貫通して金属スペーサ12にネジ14をネジ留めする。これにより、実装基板2を筐体3に固定すると共に、絶縁性の樹脂スペーサ11によりシグナルグランド配線8と導通するランド9と筐体3とを絶縁し、シグナルグランドとフレームグランドとを絶縁することができる。そのため、工場内や車両等の電磁波の影響の強い環境下で電子機器1を使用し筐体3にノイズが印加されたとしても、シグナルグランドにノイズが伝播されることが防止され、実装基板2に実装された電子部品4に及ぼす外部ノイズの影響を抑制することができる。なお、筐体3と実装基板2とのネジ留めを金属スペーサ12および絶縁性の樹脂スペーサ11とにより行う場合に限らず、金属スペーサ12を用いずに、絶縁性の樹脂スペーサ11のみによりネジ留めしても良い。この場合の樹脂スペーサ11の長さは金属スペーサ10と同じ長さとする。また、上記説明ではネジ穴13の周囲にランド9を設ける例について説明したが、ランド9を設けず、シグナルグランド配線8がネジ穴13と接触することによりネジ穴13に導電性のネジがネジ留めされた場合には、このネジとシグナルグランド配線8とが電気的に導通する構成である場合においても樹脂スペーサ11を用いることができる。   As shown in FIG. 3, in the electronic device 1 of the present invention, instead of the metal spacer 10 for fixing the mounting substrate in the conventional electronic device to the housing, an insulating spacer which is an embodiment of the insulating member, for example, insulating The resin spacer 11 and the metal spacer 12 are used. The resin spacer 11 is screwed into a screw hole 13 formed in the land 9 of the mounting substrate 2. The resin spacer 11 is formed with a screw hole at the top, and a metal spacer 12 is screwed into the screw hole. The combined length of the resin spacer 11 and the metal spacer 12 in the screwed state matches the length of the metal spacer 10. The housing 3 is placed on the metal spacer 12, and screws 14 are screwed to the metal spacer 12 through the housing 3. As a result, the mounting substrate 2 is fixed to the housing 3, the land 9 that is electrically connected to the signal ground wiring 8 is insulated from the housing 3 by the insulating resin spacer 11, and the signal ground and the frame ground are insulated. Can do. For this reason, even if noise is applied to the housing 3 using the electronic device 1 in an environment where the influence of electromagnetic waves is strong, such as in a factory or a vehicle, the noise is prevented from propagating to the signal ground, and the mounting substrate 2 The influence of external noise on the electronic component 4 mounted on can be suppressed. Note that the housing 3 and the mounting substrate 2 are not only screwed by the metal spacer 12 and the insulating resin spacer 11, but are screwed only by the insulating resin spacer 11 without using the metal spacer 12. You may do it. In this case, the length of the resin spacer 11 is the same as that of the metal spacer 10. In the above description, the land 9 is provided around the screw hole 13, but the land 9 is not provided, and the conductive ground screw is screwed into the screw hole 13 when the signal ground wiring 8 contacts the screw hole 13. When fastened, the resin spacer 11 can be used even when the screw and the signal ground wiring 8 are electrically connected.

また、従来の電子機器では、実装基板の周辺にシグナルグランド配線が露出し、実装基板の周辺と筐体とが接触するように実装基板を配置し、シグナルグランドとフレームグランドとを電気的に導通させる場合があった。また、実装基板のシグナルグランド配線を筐体基板と電気的に導通させ、筐体と接触する筐体基板を介してシグナルグランドとフレームグランドとを電気的に導通させる場合もあった。このような場合、筐体3と実装基板2との間、筐体3と筐体基板5との間、あるいは実装基板2および筐体基板5と筐体3との間に、絶縁部材の一実施形態である絶縁性のブッシュ、例えば絶縁性の樹脂ブッシュ15を設ける。絶縁性のブッシュを設けることにより、筐体3と実装基板2との間、筐体3と筐体基板5との間、あるいは実装基板2および筐体基板5と筐体3との間に隙間を設け、シグナルグランドとフレームグランドとを絶縁することができる。そのため、工場内や車両等の電磁波の影響の強い環境下で電子機器1を使用し筐体3にノイズが印加されたとしても、シグナルグランドにノイズが伝播されることが防止され、実装基板2に実装された電子部品4に及ぼす外部ノイズの影響を抑制することができる。例えば、図4に示すように、実装基板2のシグナルグランド配線8と電気的に導通する筐体基板5と筐体3との間に樹脂ブッシュ15を設ける。樹脂ブッシュ15は筐体3を挟んで固定される構成であり、樹脂ブッシュ15の少なくとも一部分が筐体基板5と筐体3との間に配設される構成である。   In addition, in conventional electronic devices, the signal ground wiring is exposed around the mounting substrate, and the mounting substrate is placed so that the periphery of the mounting substrate and the housing are in contact, and the signal ground and the frame ground are electrically connected. There was a case of letting. In some cases, the signal ground wiring of the mounting substrate is electrically connected to the housing substrate, and the signal ground and the frame ground are electrically connected via the housing substrate in contact with the housing. In such a case, one insulating member is provided between the housing 3 and the mounting substrate 2, between the housing 3 and the housing substrate 5, or between the mounting substrate 2 and the housing substrate 5 and the housing 3. An insulating bush according to the embodiment, for example, an insulating resin bush 15 is provided. By providing an insulating bush, there is a gap between the housing 3 and the mounting substrate 2, between the housing 3 and the housing substrate 5, or between the mounting substrate 2 and the housing substrate 5 and the housing 3. The signal ground and the frame ground can be insulated. For this reason, even if noise is applied to the housing 3 using the electronic device 1 in an environment where the influence of electromagnetic waves is strong, such as in a factory or a vehicle, the noise is prevented from propagating to the signal ground, and the mounting substrate 2 The influence of external noise on the electronic component 4 mounted on can be suppressed. For example, as shown in FIG. 4, a resin bush 15 is provided between the housing substrate 5 and the housing 3 that are electrically connected to the signal ground wiring 8 of the mounting substrate 2. The resin bush 15 is configured to be fixed with the housing 3 interposed therebetween, and at least a part of the resin bush 15 is disposed between the housing substrate 5 and the housing 3.

また、従来の電子機器では、コネクタ基板を筐体の一部をなすコネクタ面とする場合があり、コネクタ基板と実装基板のシグナルグランド配線とが電気的に導通する場合があった。そして、コネクタ基板と筐体とは接触するため、シグナルグランドとフレームグランドとを電気的に導通させる場合があった。このような場合、筐体3と接するコネクタ基板16の表面部分に絶縁部材の一実施形態である絶縁性のガスケット、例えば絶縁性の樹脂ガスケット17を設ける。絶縁性のガスケットを設けることにより、筐体3とコネクタ基板16とが電気的に絶縁され、シグナルグランドとフレームグランドとを絶縁することができる。そのため、工場内や車両等の電磁波の影響の強い環境下で電子機器1を使用し筐体3にノイズが印加されたとしても、シグナルグランドにノイズが伝播されることが防止され、実装基板2に実装された電子部品4に及ぼす外部ノイズの影響を抑制することができる。例えば、図5に示すように、コネクタ基板16のコネクタ面6の周囲に絶縁性の樹脂ガスケット17を設ける。コネクタ基板16はコネクタ面6の周囲で筐体3と接触するため、接触部分に絶縁性の樹脂ガスケット17を設けることにより、コネクタ基板16と筐体3とが電気的に絶縁され、シグナルグランドとフレームグランドとを絶縁することができる。なお、端子が設けられるコネクタ基板を例に説明したが、コネクタ基板に限らず、電子機器1の外面を構成し、筐体3と接する様々な用途の基板に絶縁性のガスケットを設けても良い。   Further, in the conventional electronic device, the connector board may be a connector surface that forms a part of the housing, and the connector board and the signal ground wiring of the mounting board may be electrically connected. Since the connector substrate and the housing are in contact with each other, the signal ground and the frame ground may be electrically connected. In such a case, an insulating gasket which is an embodiment of the insulating member, for example, an insulating resin gasket 17 is provided on the surface portion of the connector substrate 16 in contact with the housing 3. By providing an insulating gasket, the housing 3 and the connector substrate 16 are electrically insulated, and the signal ground and the frame ground can be insulated. For this reason, even if noise is applied to the housing 3 using the electronic device 1 in an environment where the influence of electromagnetic waves is strong, such as in a factory or a vehicle, the noise is prevented from propagating to the signal ground, and the mounting substrate 2 The influence of external noise on the electronic component 4 mounted on can be suppressed. For example, as shown in FIG. 5, an insulating resin gasket 17 is provided around the connector surface 6 of the connector substrate 16. Since the connector substrate 16 is in contact with the housing 3 around the connector surface 6, by providing an insulating resin gasket 17 at the contact portion, the connector substrate 16 and the housing 3 are electrically insulated, and the signal ground and The frame ground can be insulated. In addition, although the connector board | substrate with which a terminal is provided was demonstrated to the example, you may provide an insulating gasket in the board | substrate of the various uses which comprise the outer surface of the electronic device 1 and contact the housing | casing 3 not only in a connector board | substrate. .

なお、上述の絶縁性のスペーサ、絶縁性のブッシュおよび絶縁性のガスケットは、適宜組み合わせて設けても良い。また、図1においては、筐体3として、端子部分に別の筐体を接続できる構成の密閉構造の筐体を例として示したが、単独の、例えば立方体形状の筐体を用いることもできる。さらに、使用環境に応じて、電磁波の影響の少ない環境で使用する場合は絶縁部材を用いずにシグナルグランドとフレームグランドとを導通させて使用し、工場内や車両等の電磁波の影響の強い環境下では絶縁部材を用いてシグナルグランドとフレームグランドとを電気的に絶縁して使用することにより、使用環境に応じて最適なノイズ対策を行うことができる。   Note that the above-described insulating spacer, insulating bush, and insulating gasket may be provided in appropriate combination. Further, in FIG. 1, a case having a sealed structure in which another case can be connected to the terminal portion is shown as an example as the case 3, but a single case, for example, a cubic shape can also be used. . In addition, depending on the environment of use, when using in an environment where there is little influence of electromagnetic waves, use the signal ground and frame ground in a conductive manner without using an insulating member, and in environments where there is a strong influence of electromagnetic waves such as in a factory or vehicle. Below, by using the insulating member to electrically insulate the signal ground and the frame ground, an optimum noise countermeasure can be taken according to the use environment.

1 電子機器
2 実装基板
3 筐体
4 電子部品
5 筐体基板
6 コネクタ面
7 端子
8 シグナルグランド配線
9 ランド
10 金属スペーサ
11 樹脂スペーサ
12 金属スペーサ
13 ネジ穴
14 ネジ
15 樹脂ブッシュ
16 コネクタ基板
17 樹脂ガスケット
DESCRIPTION OF SYMBOLS 1 Electronic device 2 Mounting board 3 Case 4 Electronic component 5 Case board 6 Connector surface 7 Terminal 8 Signal ground wiring 9 Land 10 Metal spacer 11 Resin spacer 12 Metal spacer 13 Screw hole 14 Screw 15 Resin bush 16 Connector board 17 Resin gasket

Claims (4)

筐体と、
電子部品が実装されて前記筐体の内部に搭載される実装基板と、
前記実装基板に設けられるシグナルグランド配線と、
前記筐体と前記シグナルグランド配線とを電気的に絶縁する絶縁部材と
を有することを特徴とする電子機器。
A housing,
A mounting substrate on which electronic components are mounted and mounted inside the housing;
Signal ground wiring provided on the mounting substrate;
An electronic apparatus comprising: an insulating member that electrically insulates the casing from the signal ground wiring.
前記実装基板に形成されて前記シグナルグランド配線と接触するネジ穴
をさらに有し、
前記筐体と前記実装基板が前記ネジ穴でネジ留めされ、
前記絶縁部材の少なくとも1つが、前記筐体と前記実装基板とをネジ留めするネジの少なくとも一部をなす絶縁性のスペーサであることを特徴とする請求項1記載の電子機器。
A screw hole formed on the mounting substrate and in contact with the signal ground wiring;
The housing and the mounting board are screwed with the screw holes,
The electronic device according to claim 1, wherein at least one of the insulating members is an insulating spacer that forms at least a part of a screw for screwing the housing and the mounting substrate.
前記絶縁部材の少なくとも1つが、前記筐体と前記実装基板との間に設けられる絶縁性のブッシュであることを特徴とする請求項1または請求項2に記載の電子機器。   The electronic apparatus according to claim 1, wherein at least one of the insulating members is an insulating bush provided between the housing and the mounting substrate. 前記筐体と接触すると共に前記シグナルグランド配線と電気的に導通する基板をさらに有し、
前記絶縁部材の少なくとも1つが、前記基板の前記筐体と接触する部分に設けられる絶縁性のガスケットであることを特徴とする請求項1〜請求項3のいずれか1項に記載の電子機器。
Further comprising a substrate that is in contact with the housing and is electrically connected to the signal ground wiring,
4. The electronic apparatus according to claim 1, wherein at least one of the insulating members is an insulating gasket provided in a portion of the substrate that contacts the housing. 5.
JP2015190543A 2015-09-29 2015-09-29 Electronics Active JP6616992B2 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021056260A (en) * 2019-09-26 2021-04-08 キヤノン株式会社 Image forming apparatus
CN114639507A (en) * 2020-12-15 2022-06-17 中国科学院长春光学精密机械与物理研究所 Structure for insulating photoelectric equipment from external machine shell digitally
WO2024166265A1 (en) * 2023-02-08 2024-08-15 日立Astemo株式会社 Electronic control device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021056260A (en) * 2019-09-26 2021-04-08 キヤノン株式会社 Image forming apparatus
CN114639507A (en) * 2020-12-15 2022-06-17 中国科学院长春光学精密机械与物理研究所 Structure for insulating photoelectric equipment from external machine shell digitally
CN114639507B (en) * 2020-12-15 2023-06-16 中国科学院长春光学精密机械与物理研究所 Structure for digitally insulating photoelectric equipment from external shell
WO2024166265A1 (en) * 2023-02-08 2024-08-15 日立Astemo株式会社 Electronic control device

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