JPS6214720Y2 - - Google Patents
Info
- Publication number
- JPS6214720Y2 JPS6214720Y2 JP18879980U JP18879980U JPS6214720Y2 JP S6214720 Y2 JPS6214720 Y2 JP S6214720Y2 JP 18879980 U JP18879980 U JP 18879980U JP 18879980 U JP18879980 U JP 18879980U JP S6214720 Y2 JPS6214720 Y2 JP S6214720Y2
- Authority
- JP
- Japan
- Prior art keywords
- circuit board
- printed circuit
- coil spring
- case
- contact
- 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.)
- Expired
Links
- 239000002184 metal Substances 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Description
【考案の詳細な説明】
この考案は、例えば小型電子式計算機などの小
型電子機器の静電シールド装置に関する。[Detailed Description of the Invention] This invention relates to an electrostatic shielding device for a small electronic device such as a small electronic calculator.
例えば小型電子式計算機におけるケースには、
装飾性をもたせるために金属パネルからなる上部
ケースと下部ケースを用いるとともに、これら両
ケース間に合成樹脂からなる中間フレームを設け
て両ケースを固定し、ケース内部にLSI（大規模
集積回路）などの部品を搭載したプリント基板を
保持している。 For example, in the case of small electronic calculators,
An upper case and a lower case made of metal panels are used to provide decoration, and an intermediate frame made of synthetic resin is installed between these two cases to secure them together, and an LSI (Large Scale Integrated Circuit) etc. It holds a printed circuit board with components mounted on it.
このような構成のケースにおいては、金属から
なる上部ケースおよび下部ケースに使用者が手を
触れると、人体の静電気がケースを介してケース
内のLSIに流れて、LSIが破壊される虞れがあ
る。このため、導電部材によつて、上部ケースと
下部ケースを電気的に接続したものが考えられて
いる。しかし、このようなものでは、両ケースの
電位が不安定であるため、最近は導電部材により
上部ケース、下部ケースおよびプリント基板の電
極端子とを接続することにより、これらの部材を
同電位に保つて静電シールドを行なつている。 In a case with such a configuration, if a user touches the metal upper and lower cases, there is a risk that static electricity from the human body will flow through the case to the LSI inside the case, causing damage to the LSI. be. For this reason, it has been considered to electrically connect the upper case and the lower case with a conductive member. However, in such a case, the potential of both cases is unstable, so recently it is possible to keep these parts at the same potential by connecting the upper case, lower case, and the electrode terminal of the printed circuit board with a conductive member. electrostatic shielding.
従来、この種の静電シールド装置は、第１図に
示すように、プリント基板ａに貫通孔ｂをあけ、
プリント基板ａに対して半田付けした板ばねｃの
一方の脚c1を上記貫通孔ｂを介して中間フレーム
ｄに穿つた貫通孔ｅ内に延出させて、上部ケース
ｆに先端を接触させると共に、他方の脚c2を中間
フレームｇに穿つた貫通孔ｈ内に延出させて、下
部ケースｉに先端を接触させる構造のものが知ら
れている。この構造では、板ばねｃの接触性が不
安定であり、また、この板ばねｃを入れて置くた
めの空間が大きく、半田付けを行うために工数が
かかるという欠点がある。また、板ばねｃの成形
における金型コストが高く、更に、部品として存
在している間に変形し易く、上述のような接触不
良が起ることになる。 Conventionally, this type of electrostatic shielding device has a through hole b formed in a printed circuit board a, as shown in FIG.
One leg c1 of the leaf spring c soldered to the printed circuit board a is extended through the through hole b into the through hole e drilled in the intermediate frame d, and its tip is brought into contact with the upper case f. In addition, a structure is known in which the other leg c2 extends into a through hole h formed in the intermediate frame g, and its tip contacts the lower case i. This structure has disadvantages in that the contact of the leaf spring c is unstable, the space in which the leaf spring c is placed is large, and it takes a lot of man-hours to perform soldering. Furthermore, the mold cost for molding the leaf spring c is high, and furthermore, the leaf spring c is easily deformed while it exists as a component, resulting in poor contact as described above.
そこで、第２図に示すように中間フレームｄ，
ｇにそれぞれスプリング収客孔e′およびh′を穿
ち、ここに圧縮コイルばねｊおよびｋを収客し、
それぞれの一端をプリント基板ａに接触させ、他
端を上部ケースｆおよび下部ケースｉに接触させ
る構造も提唱された。この構造では、板ばねの場
合に比べて安定した接触性を得ることができ、か
つばねの収客空間も小さくできるという利点はあ
るが、ばねを２個使用しなければならないという
不都合もある。 Therefore, as shown in FIG. 2, intermediate frames d,
Drill spring collection holes e′ and h′ in g, respectively, and collect compression coil springs j and k therein,
A structure has also been proposed in which one end of each is brought into contact with the printed circuit board a, and the other end is brought into contact with the upper case f and the lower case i. This structure has the advantage of being able to provide more stable contact compared to the case of leaf springs, and that the space for accommodating the springs can be made smaller, but it also has the disadvantage of requiring the use of two springs.
この考案は、上記事情にもとづいてなされたも
ので、安定した接触性を維持し、かつ収客空間も
小さく、また、ばねも１個で済ませることができ
て組立て易い構造に改良した小型電子機器の静電
シールド装置を提供しようとするものである。 This idea was developed based on the above-mentioned circumstances, and is a small electronic device that maintains stable contact, has a small customer space, and has an improved structure that requires only one spring and is easy to assemble. The present invention aims to provide an electrostatic shielding device.
以下、この考案を、第３図に示す一実施例にも
とづいて具体的に説明する。図において、符号１
はプリント基板であり、このプリント基板１を挾
むようにして、合成樹脂からなる中間フレーム
２、および３が設けられている。この中間フレー
ム２にはやや大径の貫通孔４が穿つてあり、上記
プリント基板１および中間フレーム３にはそれぞ
れ小径の貫通孔５および６が穿つてある。この貫
通孔５の周囲のプリント基板１上には銅箔からな
る電極端子１ａが設けられている。これら貫通孔
４，５および６に亘つて嵌挿される金属製のコイ
ルばね７は、半分が大径のターン部分７ａとな
り、半分が小径のターン部分７ｂとなつたもの
で、その大径のターン部分７ａは貫通孔４内に位
置し、小径のターン部分７ｂは貫通孔５および６
にまたがつて位置される。そして、上記コイルば
ね７は、その両端を、中間フレーム２，３の外側
に配置される金属パネルからなる上部ケース８お
よび下部ケース９の内面に弾圧接触される。この
場合、ターン部分７ａと７ｂとの段差の部分７ｃ
がプリント基板１の電極端子１ａに接触して電気
的導通状態を得ている。この電極端子１ａは例え
ば接地レベルに保たれている。 This invention will be specifically explained below based on an embodiment shown in FIG. In the figure, the symbol 1
1 is a printed circuit board, and intermediate frames 2 and 3 made of synthetic resin are provided so as to sandwich the printed circuit board 1 therebetween. The intermediate frame 2 has a slightly large diameter through hole 4, and the printed circuit board 1 and the intermediate frame 3 have small diameter through holes 5 and 6, respectively. Electrode terminals 1a made of copper foil are provided on the printed circuit board 1 around this through hole 5. The metal coil spring 7 that is fitted across these through holes 4, 5, and 6 has half a large-diameter turn portion 7a and a half a small-diameter turn portion 7b. The portion 7a is located within the through hole 4, and the small diameter turn portion 7b is located within the through hole 5 and 6.
located across the Both ends of the coil spring 7 are brought into elastic contact with the inner surfaces of an upper case 8 and a lower case 9 made of metal panels arranged outside the intermediate frames 2 and 3. In this case, the stepped portion 7c between the turn portions 7a and 7b
is in contact with the electrode terminal 1a of the printed circuit board 1 to obtain electrical continuity. This electrode terminal 1a is maintained at a ground level, for example.
このような構成では、プリント基板１の上側か
らコイルばね７を貫通孔５に挿通して大径のター
ン部分７ａをプリント基板１上に残した状態でそ
れぞれ中間フレーム２，３を組合せるだけで、各
ターン部分７ａおよび７ｂは貫通孔４および５，
６内に位置され、上部ケース８および下部ケース
９との接触を達成できるのである。そして、この
組立時には、貫通孔５内に保持されているために
コイルばね７の位置づれを生ずるおそれがなく、
段差部分７ｃでプリント基板１の電極端子１ａへ
の確実な電気的接触を達成できる。また、コイル
ばね７は大径のターン部７ａを上部ケース８とプ
リント基板１とで挾持する構成であるから、電池
交換や修理の際に下部ケース９を取り外した場合
でもコイルばね７が脱落することはなく安定して
保持されている。 In such a configuration, the coil spring 7 is inserted into the through hole 5 from above the printed circuit board 1, and the intermediate frames 2 and 3 are assembled by simply inserting the coil spring 7 into the through hole 5 and leaving the large diameter turn portion 7a on the printed circuit board 1. , each turn portion 7a and 7b has through holes 4 and 5,
6 so that contact with the upper case 8 and the lower case 9 can be achieved. During this assembly, there is no risk of positional displacement of the coil spring 7 since it is held within the through hole 5.
Reliable electrical contact to the electrode terminals 1a of the printed circuit board 1 can be achieved at the stepped portions 7c. Further, since the coil spring 7 has a structure in which the large-diameter turn portion 7a is held between the upper case 8 and the printed circuit board 1, the coil spring 7 will not fall off even if the lower case 9 is removed for battery replacement or repair. It remains stable without any problems.
なお、この実施例では、コイルばね７を大径の
ターン部分と小径のターン部分とに分けて形成し
たが、全体として同じ径のターンで構成し、この
実施例における段差の部分において１ターンだけ
大径にするなどの変形でプリント基板の電極端子
に対する電気的導通を計るようにしてもよいこと
勿論であり、この形状には、種々の変形が予想で
きるのである。 In this embodiment, the coil spring 7 is formed separately into a large-diameter turn portion and a small-diameter turn portion, but the coil spring 7 is formed with turns of the same diameter as a whole, and only one turn is formed in the step portion in this embodiment. Of course, electrical conduction to the electrode terminals of the printed circuit board may be achieved by modifying the shape, such as increasing the diameter, and various modifications can be expected to this shape.
また、上記実施例ではコイルばね７を上部ケー
ス８とプリント基板１とで挾んで保持する構成と
したが、これに限らずコイルばね７のらせん部分
の間にプリント基板を挾むことによりコイルばね
７を取付けてもよい。 Further, in the above embodiment, the coil spring 7 is held between the upper case 8 and the printed circuit board 1, but the structure is not limited to this, and by sandwiching the printed circuit board between the spiral portions of the coil spring 7, the coil spring 7 may be installed.
さらに、実施例ではプリント基板１に貫通孔５
を設けてコイルばね７を挿通させたが、これに限
らず、プリント基板１の端部に切欠きを設け、こ
の切欠きの周囲に電極端子を形成したものでもよ
い。 Furthermore, in the embodiment, a through hole 5 is provided in the printed circuit board 1.
Although the coil spring 7 is inserted through the printed circuit board 1, the present invention is not limited to this, and a notch may be provided at the end of the printed circuit board 1 and electrode terminals may be formed around the notch.
この考案は実施例のような小型電子式計算機に
限らず、金属パネルでケースを構成した小型電子
機器に広く適用できるものである。 This invention can be widely applied not only to small electronic calculators as in the embodiment, but also to small electronic devices whose cases are made of metal panels.
この考案は、以上詳述したように金属パネルか
らなる上部ケースおよび下部ケースと、プリント
基板の電極端子とを１個のコイルばねで電気的に
接続したから、部品点数が減少し、組立ても安易
となり、また、コイルばねの収客空間も小さくて
よく、かつ安定した接触状態が得られ、接続不良
などの不都合が生じないなど、品質の向上を計る
ことができる。 As detailed above, this idea uses a single coil spring to electrically connect the upper case and lower case made of metal panels to the electrode terminals of the printed circuit board, reducing the number of parts and making assembly easy. In addition, the space required for the coil spring to accommodate customers can be small, and a stable contact state can be obtained, and inconveniences such as connection failures do not occur, and quality can be improved.
第１図は従来例の縦断側面図、第２図は別の例
を示す縦断側面図、第３図はこの考案の一実施例
を示す縦断側面図である。
１……プリント基板、１ａ……電極端子、２，
３……中間フレーム、４，５，６……貫通孔、７
……コイルばね、７ｃ……段差部分、８……上部
ケース、９……下部ケース。
FIG. 1 is a vertical side view of a conventional example, FIG. 2 is a vertical side view of another example, and FIG. 3 is a vertical side view of an embodiment of the invention. 1...Printed circuit board, 1a...electrode terminal, 2,
3... Intermediate frame, 4, 5, 6... Through hole, 7
...Coil spring, 7c...Step part, 8...Upper case, 9...Lower case.
Claims (1)
と、これらケースの間に設けられるプリント基板
とを有する小型電子機器において、上記プリント
基板上に設けられた電極端子と、上記プリント基
板の上下面を横切つて設けられ上記電極端子に接
触する接触部を有する金属製のコイルばねとを備
え、上記コイルばねを上記両ケースにより圧縮
し、上記コイルばねの両端を上記両ケースに各々
接触させてなる小型電子機器の静電シールド装
置。 In a small electronic device having an upper case and a lower case made of a metal panel, and a printed circuit board provided between these cases, an electrode terminal provided on the printed circuit board and an electrode terminal provided on the printed circuit board are connected across the upper and lower surfaces of the printed circuit board. and a metal coil spring having a contact portion that contacts the electrode terminal, the coil spring is compressed by the two cases, and both ends of the coil spring are brought into contact with the two cases. electrostatic shielding device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18879980U JPS6214720Y2 (en) | 1980-12-27 | 1980-12-27 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18879980U JPS6214720Y2 (en) | 1980-12-27 | 1980-12-27 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57110993U JPS57110993U (en) | 1982-07-09 |
| JPS6214720Y2 true JPS6214720Y2 (en) | 1987-04-15 |
Family
ID=29992596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18879980U Expired JPS6214720Y2 (en) | 1980-12-27 | 1980-12-27 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6214720Y2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4651008B2 (en) * | 2005-02-01 | 2011-03-16 | シチズン電子株式会社 | Light emitting diode |
| JP5268032B2 (en) * | 2009-07-22 | 2013-08-21 | カシオ計算機株式会社 | Unit device |
| JP2012124317A (en) * | 2010-12-08 | 2012-06-28 | Nifco Inc | Grounding fastener |
-
1980
- 1980-12-27 JP JP18879980U patent/JPS6214720Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57110993U (en) | 1982-07-09 |
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