JPH0195598A - Frame earth connection structure of shelf and circuit unit - Google Patents
Frame earth connection structure of shelf and circuit unitInfo
- Publication number
- JPH0195598A JPH0195598A JP25269387A JP25269387A JPH0195598A JP H0195598 A JPH0195598 A JP H0195598A JP 25269387 A JP25269387 A JP 25269387A JP 25269387 A JP25269387 A JP 25269387A JP H0195598 A JPH0195598 A JP H0195598A
- Authority
- JP
- Japan
- Prior art keywords
- shelf
- circuit unit
- frame
- surface plate
- printed wiring
- 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.)
- Granted
Links
- 238000003780 insertion Methods 0.000 claims abstract description 14
- 230000037431 insertion Effects 0.000 claims abstract description 14
- 238000000605 extraction Methods 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 238000004806 packaging method and process Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Landscapes
- Mounting Of Printed Circuit Boards And The Like (AREA)
- Elimination Of Static Electricity (AREA)
Abstract
Description
【発明の詳細な説明】
〔概 要〕
シェルフとプラグイン回路ユニットとのフレームアース
接続の構造に関し、
フレームアースの実装上および電気特性上の効果的な供
給の達成を目的とし、
複数の回路ユニットをプラグイン実装し、後面のバック
ボードで相互接続を行わしめる、シェルフにおいて、シ
ェルフの上下前縁部に、アースバー兼用の構造部材を対
向して備え、プリント配線板実装で、後縁にプラグイン
接続用コネクタを備え、内部の全フレームアースを、前
部を覆設する金属表面板に集中接続し、前部に、シェル
フへの挿抜およびロックの手段を設けた、回路ユニット
とし、上記挿抜およ、びロックの手段が、シェルフの構
造部材と表面板とに対して電気的導通をなす如く行われ
てなる構成である。[Detailed Description of the Invention] [Summary] Regarding the structure of the frame ground connection between a shelf and a plug-in circuit unit, the purpose is to achieve effective supply of frame ground in terms of mounting and electrical characteristics, and a plurality of circuit units. The shelf is equipped with plug-in mounting and interconnections are made on the rear backboard.The shelf has structural members that also serve as ground bars facing each other on the upper and lower front edges of the shelf, and is mounted on a printed wiring board and is plugged in at the rear edge. It is a circuit unit that is equipped with a connector for connection, centrally connects the entire internal frame ground to the metal surface plate covering the front part, and has means for insertion and removal into the shelf and locking means on the front part, and the above-mentioned insertion and removal. The locking means is configured to provide electrical continuity between the structural members of the shelf and the top plate.
本発明は、シェルフとプラグイン回路ユニットとの構造
に係り、特に、フレームアース接続の構造に関す。The present invention relates to the structure of a shelf and a plug-in circuit unit, and particularly to the structure of a frame ground connection.
フレームアースは、電子回路を構成する部品の遮蔽アー
ス、配線の遮蔽アース、遮蔽構造物のアース、等に供給
されて、電子回路の電磁雑音を逃がす目的で用いられる
。The frame ground is supplied to the shielding ground of parts constituting an electronic circuit, the shielding ground of wiring, the grounding of a shielding structure, etc., and is used for the purpose of dissipating electromagnetic noise of the electronic circuit.
このフレームアースの供給接続では、各遮蔽アースから
の雑音電流が流れるので、これが、電子回路に影響を与
えないように配慮する必要がある。In this frame ground supply connection, noise current from each shield ground flows, so care must be taken to prevent this from affecting the electronic circuit.
従来から電源供給回路の片側の接地回路は、出来るだけ
電気抵抗を下げた配線構造としており、従って、この接
地回路にフレームアースも一緒に接続していた。Conventionally, the ground circuit on one side of the power supply circuit has a wiring structure that reduces electrical resistance as much as possible, and therefore, the frame earth is also connected to this ground circuit.
しかし、電子回路の高周波化、高速度化に伴い、接地回
路の低抵抗化が難しくなって来たのと、各々の遮蔽アー
スからの雑音電流が、電源線を共通に流れることから、
電子回路の動作に悪影響を与えていた。However, as the frequency and speed of electronic circuits increase, it has become difficult to reduce the resistance of the grounding circuit, and the noise current from each shielding ground flows through the power line in common.
This had a negative effect on the operation of electronic circuits.
そこで、各遮蔽アースを、電源供給回路や電子回路の接
地回路とは別に、フレームアース回路として独立に設け
て、接続することが行われている。Therefore, each shield earth is independently provided and connected as a frame earth circuit separately from the power supply circuit and the earth circuit of the electronic circuit.
しかしながら、 ・
■ 回路ユニットのプリント配線板に、更に、フレーム
アース専用の別パターンの追加が必要で、より広い面積
のプリント配線板が必要となる。However, - ■ It is necessary to add another pattern dedicated to the frame ground to the printed wiring board of the circuit unit, which requires a printed wiring board with a wider area.
■ また、このパターンの径路により、接近した別口路
やＩＣ等の部品に雑音誘導を起こすので、高度なパター
ン設計が要求される。(2) In addition, the path of this pattern induces noise into nearby separate ports and components such as ICs, so a sophisticated pattern design is required.
等の問題点がある。There are other problems.
本発明は、これらの従来の問題点を顧みて、回路ユニッ
トとシェルフとの、フレームアースの効果的な供給の達
成、を目的として、新フレームアース接続の構造を提供
するものであります。The present invention takes these conventional problems into account and provides a new frame ground connection structure for the purpose of effectively supplying frame ground between the circuit unit and the shelf.
上記問題点は、第１図に示す如く、
複数の回路ユニット１をプラグイン実装し、後面のバッ
クボード６で相互接続を行わしめる、シェルフ５におい
て、
シェルフ５の上下前縁部に、アースバー兼用の構造部材
７を対向して備えである。The above problem is solved by the fact that, as shown in Fig. 1, in a shelf 5 in which a plurality of circuit units 1 are plug-in mounted and interconnected through a backboard 6 on the rear side, the upper and lower front edges of the shelf 5 also serve as ground bars. The structural members 7 are arranged opposite to each other.
プリント配線板２実装で、後縁にプラグイン接続用コネ
クタ３を備え、内部の全フレームアースを、前部を覆設
する金属表面板４に集中接続させ、前部に、シェルフ５
への挿抜およびロックの手段を設けた、回路ユニットｌ
としである。A printed wiring board 2 is mounted, a connector 3 for plug-in connection is provided on the rear edge, all internal frame earths are centrally connected to a metal surface plate 4 covering the front part, and a shelf 5 is installed in the front part.
A circuit unit l provided with means for insertion/extraction and locking.
It's Toshide.
ここで、上記挿抜およびロックの手段が、シェルフ５の
構造部材７と表面板４とに対して電気的導通をなす如く
行われる、本発明のシェルフと回路ユニットとのフレー
ムアース接続の構造にヨリ解決される。Here, the insertion/extraction and locking means are performed in such a manner that electrical continuity is established between the structural member 7 of the shelf 5 and the surface plate 4, which is different from the structure of the frame ground connection between the shelf and the circuit unit of the present invention. resolved.
即ち、表面板をフレームアース基準とするので、各フレ
ームアース配線は短くなり、実装および電気特性上効果
的となり、目的は達成される。That is, since the surface plate is used as the frame ground reference, each frame ground wiring becomes short, which is effective in terms of mounting and electrical characteristics, and the purpose is achieved.
本発明では、フレームアースの供給を、シェルフ５の構
造部材７＝＞回路ユニット１の表面板４＝６プリント配
線８−０各遮蔽位置、の順で接続される。In the present invention, the frame ground supply is connected in the following order: structural member 7 of shelf 5 => surface plate 4 of circuit unit 1 = 6 printed wiring 8-0 at each shielding position.
第１図の如く、表面板４の片側〜縁を曲折させ、プリン
ト配線８と導通させて、プリント配線板２の前縁部に固
定させる。As shown in FIG. 1, one side to the edge of the surface board 4 is bent, electrically connected to the printed wiring 8, and fixed to the front edge of the printed wiring board 2.
従って、プリント配線板２の前縁部をフレームアースの
配線パターンとすることが出来、各遮蔽位置から前縁に
至る最短のプリント配線８で接続が行え、プリント配線
８のパターン増加に伴う配線面積の増大を最低に抑え得
る。Therefore, the front edge of the printed wiring board 2 can be used as a frame ground wiring pattern, and connections can be made with the shortest printed wiring 8 from each shielding position to the front edge, and the wiring area increases as the pattern of printed wiring 8 increases. increase can be minimized.
且つ、最外周の配線となり内部配線への誘導の影響を最
小とさせることが可能となる。In addition, since it is the outermost wiring, it is possible to minimize the influence of induction on the internal wiring.
また、構造部材７と表面板４との導通機能を備えた、回
路ユニット１のシェルフ５への挿抜およびロックの手段
としては、各種のものがあり、例えば第１図の如（、表
面板４の上下部に金属貫通ねじ４５を設け、回路ユニッ
ト１をシェルフ５に挿入し、構造部材７に設けたねじ穴
７２に、貫通ねじ４５を締付けて装着させる１一番簡単
な構造手段で、装着と同時に構造部材７と表面板４とを
導通させている。In addition, there are various means for inserting/removing the circuit unit 1 into/from the shelf 5 and locking the circuit unit 1, which has a conduction function between the structural member 7 and the surface plate 4. For example, as shown in FIG. Metal penetrating screws 45 are provided at the top and bottom, the circuit unit 1 is inserted into the shelf 5, and the penetrating screws 45 are tightened into the screw holes 72 provided in the structural member 7. At the same time, the structural member 7 and the surface plate 4 are electrically connected.
金属表面板４は回路ユニット１の前面を覆設し、フレー
ムアース接続されているので、外部静電気が表面板４に
放電されても、直ちに接地されて、回路ユニット１の内
部への影響を遮断させることが出来る。The metal surface plate 4 covers the front surface of the circuit unit 1 and is connected to the frame ground, so even if external static electricity is discharged to the surface plate 4, it is immediately grounded and the influence on the inside of the circuit unit 1 is blocked. I can do it.
かくして、前述の従来例の問題点、プリント配線の実装
上、および配線間の誘導の影響の特性上の問題点が解決
されて、効果的なフレームアース接続の構造が得られる
。In this way, the problems of the conventional example described above, the problems in mounting the printed wiring, and the characteristics of the influence of induction between the wirings are solved, and an effective frame earth connection structure is obtained.
以下図面に示す実施例によって本発明を具体的に説明す
る。The present invention will be specifically described below with reference to embodiments shown in the drawings.
全図を通し同一符合は同一対称物を示す。The same reference numerals indicate the same objects throughout the figures.
第２図（ａｌに本発明の一実施例の斜−挽断面図、同図
（ｂ）に同Ａ部拡大図、同図（Ｃ）に同Ｂ部拡大図を示
す。FIG. 2 (al) is a cross-sectional view of an embodiment of the present invention, FIG. 2(b) is an enlarged view of section A, and FIG. 2(C) is an enlarged view of section B.
図の如く、プリント配線板２（縦２０×横３０ＣＩｌｌ
）は、片面に部品を実装し、プリント配線８にて接続、
回路構成させた回路ユニット１で、後縁部に外部接続用
のコネクタ３を実装し、前部に金属表面板４が、前面を
覆設し、片側縁を折曲させ、その面をプリント配線板２
の前縁部に重ねて、プリント配線８と表面板４とを導通
するようにリベット固定しである。As shown in the figure, printed wiring board 2 (vertical 20×width 30 CIll)
), components are mounted on one side and connected using printed wiring 8.
A circuit unit 1 configured with a circuit has a connector 3 for external connection mounted on the rear edge, a metal surface plate 4 covering the front surface, one edge bent, and printed wiring on that surface. Board 2
The printed wiring 8 and the front plate 4 are fixed with rivets so as to be electrically connected to each other.
その表面板４の上下部の突出片に、スプリングビンを用
いてレバー４１が軸支しである。A lever 41 is pivotally supported on the upper and lower protruding pieces of the surface plate 4 using spring bins.
コルバー４１は、導電体のアルミダイカスト或いは金属
繊維混入プラスチックの成型品とし、片先端に、シェル
フ５の上下前縁に対向に設けた、コ字形断面の金属構造
部材７の前縁に係合させて、回路ユニット１を挿入、装
着させる挿入順４２と、同じく逆向きに係合１作用させ
て、抜去させる抜装置４３とを、向き合いに設けである
。また、他端側は把手４４となしており、軸支点を境に
、把手４４、の印加力に対して、挿入順４２および抜装
置４３の作用力は、梃作用をなさせて２倍以上としてい
る。The corver 41 is made of a conductive aluminum die-cast or a molded product of plastic mixed with metal fibers, and has one end engaged with the front edge of a metal structural member 7 having a U-shaped cross section, which is provided opposite to the upper and lower front edges of the shelf 5. An insertion order 42 for inserting and mounting the circuit unit 1 and an extraction device 43 for removing the circuit unit 1 by applying the engagement 1 in the opposite direction are provided facing each other. In addition, the other end side is a handle 44, and the force applied by the insertion order 42 and the extraction device 43 is more than twice as much as the force applied by the handle 44, due to the lever action. It is said that
シェルフ５は、この回路ユニット１の複数個を所定位置
に集合、プラグイン実装させ、回路を相互接続させて、
所定の回路機能に纏めており、後面をコネクタを実装し
たプリント配線板のバックボード６で構成させ、上板、
下板に回路ユニット１を挿入案内するガイド５１を備え
、上下の前縁部に、前述の構造部材７が固定され、この
構造部材７に接して、Ｌ字形断面で片面を櫛歯状に切り
込みバネ作用を持たせたステンレスのバネ条７１を、バ
ネ面を対向させて固定してあり、更に、構造部品材７の
左右端部は、シェルフ２の外部からの接地配線が接続可
能な処理がなされている。The shelf 5 collects a plurality of circuit units 1 at a predetermined position, performs plug-in mounting, and interconnects the circuits.
It is organized into a predetermined circuit function, and consists of a backboard 6, which is a printed wiring board with connectors mounted on the rear side, and an upper board,
The lower plate is provided with a guide 51 for inserting and guiding the circuit unit 1, and the above-mentioned structural member 7 is fixed to the upper and lower front edges, and in contact with this structural member 7, a comb-like cut is made on one side with an L-shaped cross section. Stainless steel spring strips 71 with spring action are fixed with their spring surfaces facing each other, and the left and right ends of the structural component material 7 are treated to allow connection of ground wiring from outside the shelf 2. being done.
従って、回路ユニット１のプリント配線板２の上縁部お
よび下縁部を、シェルフ５の所定位置のガイド５１に案
内させて挿入させ、各レバー４１が略水平位置にあれば
、抜装置４３の先端が構造部材７の前縁に突き当たる、
そこで、把手４４を互いに近づくように回動させれば、
挿入順４２が構造部材７の裏面に係合して、梃作用で増
力されて回路ユニット１を挿入させ、略垂直位置で、コ
ネクタ３が所定位置まで挿入されてプラグイン接続がな
され、装着が完了する。Therefore, when the upper and lower edges of the printed wiring board 2 of the circuit unit 1 are guided and inserted by the guides 51 at predetermined positions of the shelf 5, and each lever 41 is in a substantially horizontal position, the extraction device 43 is inserted. The tip abuts against the front edge of the structural member 7,
Therefore, if the handles 44 are rotated so that they approach each other,
The insertion order 42 engages with the back surface of the structural member 7, and the force is increased by the lever action, causing the circuit unit 1 to be inserted, and in the substantially vertical position, the connector 3 is inserted to a predetermined position, a plug-in connection is made, and the installation is completed. Complete.
この際、挿入順４２の背面がバネ条７１のバネ面に接触
して、アースバーとした構造部材７とレバー４１とは、
電気的に安定な接続状態が得られるようにしである。At this time, the back surface of the insertion order 42 comes into contact with the spring surface of the spring strip 71, and the structural member 7 and the lever 41 are made into an earth bar.
This is to ensure an electrically stable connection.
従って、回路ユニット１の挿入状態では、［プリント配
線板２の全遮蔽位置→プリント配線８→表面板４→レバ
ー４１＝＞バネ条７１−＝＞構造部材７コの径路でフレ
ームアースの安定な偲通接続がなされ、シェルフ５の外
部の接地配線に接地される。Therefore, when the circuit unit 1 is inserted, a stable frame ground is established in the path of [full shielding position of printed wiring board 2 → printed wiring 8 → surface plate 4 → lever 41 => spring strip 71 => seven structural members. A connection is made and the shelf 5 is grounded to the external ground wiring.
上記実施例は一例を示し、回路ユニット１のシェルフ５
への挿入およびロックの手段としての構造は、上記のも
のに限定するものではない。The above embodiment shows an example, and the shelf 5 of the circuit unit 1
The structure as a means for insertion into and locking is not limited to the above.
以上の如く、前述の従来例の問題点、プリント配線の実
装上、および配線間の誘導の影響の特性上の問題点が解
決され、効果的なフレームアース接続の構造が得られ、
更に、回路ユニットの前面が接地されており、外部の静
電気が表面板に放電されでも、プリント配線に影響を与
えないような遮断作用もなし、その効果は大なるものが
ある。As described above, the problems of the conventional example described above, the problems with the mounting of printed wiring, and the characteristics of the influence of induction between wires are solved, and an effective frame earth connection structure is obtained.
Furthermore, the front surface of the circuit unit is grounded, so even if external static electricity is discharged to the surface plate, there is no interruption effect that will not affect the printed wiring, which is very effective.
第１図は本発明の斜視断面図、
第２図は本発明の一実施例である。
図において、
１は回路ユニット、 ２はプリント配線板、３はコネク
タ、 ４は表面板、
５はシェルフ、 ６はバックボード、７は構造部
材、 ８はプリント配線、４１はレバー、
４２は挿入顎、４３は抜装置、 ４４は把手、
４５は貫通ねし、 ５１はガイド、７１はバネ条、
７２はねじ穴である。FIG. 1 is a perspective sectional view of the present invention, and FIG. 2 is an embodiment of the present invention. In the figure, 1 is a circuit unit, 2 is a printed wiring board, 3 is a connector, 4 is a surface board, 5 is a shelf, 6 is a backboard, 7 is a structural member, 8 is a printed wiring, 41 is a lever,
42 is an insertion jaw, 43 is an extraction device, 44 is a handle, 45 is a penetrating screw, 51 is a guide, 71 is a spring strip,
72 is a screw hole.
Claims (1)
のバックボード（６）で相互接続を行わしめる、シェル
フ（５）において、 該シェルフ（５）の上下前縁部に、アースバー兼用の構
造部材（７）を対向して備え、 プリント配線板（２）実装で、後縁にプラグイン接続用
コネクタ（３）を備え、内部の全フレームアースを、前
部を覆設する金属表面板（４）に集中接続し、前部に、
該シェルフ（５）への挿抜およびロックの手段を設けた
、該回路ユニット（１）とし、 上記挿抜およびロックの手段が、該シェルフ（５）の構
造部材（７）と該表面板（４）とに対して電気的導通を
なす如く行われる、ことを特徴とするシェルフと回路ユ
ニットとのフレームアース接続の構造。[Claims] In a shelf (5) on which a plurality of circuit units (1) are plug-in mounted and interconnected by a backboard (6) on the rear side, the top and bottom front edges of the shelf (5) include: , equipped with structural members (7) that also serve as earth bars, mounted on a printed wiring board (2), equipped with a plug-in connector (3) on the rear edge, and covered the front part with the entire internal frame ground. centrally connected to the metal surface plate (4) that
The circuit unit (1) is provided with means for insertion/extraction and locking into the shelf (5), and the means for insertion/extraction and locking is provided between the structural member (7) of the shelf (5) and the surface plate (4). A frame ground connection structure between a shelf and a circuit unit, characterized in that the structure is such that electrical continuity is established between the shelf and the circuit unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62252693A JPH0693547B2 (en) | 1987-10-07 | 1987-10-07 | Structure of frame ground connection between shelf and circuit unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62252693A JPH0693547B2 (en) | 1987-10-07 | 1987-10-07 | Structure of frame ground connection between shelf and circuit unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0195598A true JPH0195598A (en) | 1989-04-13 |
| JPH0693547B2 JPH0693547B2 (en) | 1994-11-16 |
Family
ID=17240933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62252693A Expired - Fee Related JPH0693547B2 (en) | 1987-10-07 | 1987-10-07 | Structure of frame ground connection between shelf and circuit unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0693547B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5386346A (en) * | 1991-08-29 | 1995-01-31 | Hubbell Incorporated | Circuit card assembly with shielding assembly for reducing EMI emissions |
| US6172880B1 (en) | 1998-07-31 | 2001-01-09 | Hubbell Incorporated | Faceplate for an electronic circuit card for reducing EMI emissions between circuit cards inserted in a circuit card housing |
| AT409047B (en) * | 1995-08-23 | 2002-05-27 | Huber Signalbau Ag | DEVICE FOR GROUNDING A MODULAR HOUSING UNIT |
| JP2006278561A (en) * | 2005-03-28 | 2006-10-12 | Mitsumi Electric Co Ltd | Communication apparatus |
| JP2006278559A (en) * | 2005-03-28 | 2006-10-12 | Mitsumi Electric Co Ltd | Communication apparatus |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5863787U (en) * | 1981-10-23 | 1983-04-28 | 株式会社日立製作所 | Pull-out contact piece for electronic circuit package |
| JPS6175173U (en) * | 1984-10-22 | 1986-05-21 | ||
| JPS61281595A (en) * | 1985-06-06 | 1986-12-11 | 富士通株式会社 | Frame earth connection for package front board |
| JPS61201389U (en) * | 1985-06-05 | 1986-12-17 |
-
1987
- 1987-10-07 JP JP62252693A patent/JPH0693547B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5863787U (en) * | 1981-10-23 | 1983-04-28 | 株式会社日立製作所 | Pull-out contact piece for electronic circuit package |
| JPS6175173U (en) * | 1984-10-22 | 1986-05-21 | ||
| JPS61201389U (en) * | 1985-06-05 | 1986-12-17 | ||
| JPS61281595A (en) * | 1985-06-06 | 1986-12-11 | 富士通株式会社 | Frame earth connection for package front board |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5386346A (en) * | 1991-08-29 | 1995-01-31 | Hubbell Incorporated | Circuit card assembly with shielding assembly for reducing EMI emissions |
| AT409047B (en) * | 1995-08-23 | 2002-05-27 | Huber Signalbau Ag | DEVICE FOR GROUNDING A MODULAR HOUSING UNIT |
| US6172880B1 (en) | 1998-07-31 | 2001-01-09 | Hubbell Incorporated | Faceplate for an electronic circuit card for reducing EMI emissions between circuit cards inserted in a circuit card housing |
| JP2006278561A (en) * | 2005-03-28 | 2006-10-12 | Mitsumi Electric Co Ltd | Communication apparatus |
| JP2006278559A (en) * | 2005-03-28 | 2006-10-12 | Mitsumi Electric Co Ltd | Communication apparatus |
| JP4529758B2 (en) * | 2005-03-28 | 2010-08-25 | ミツミ電機株式会社 | Communication equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0693547B2 (en) | 1994-11-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |