JPH0422515Y2 - - Google Patents
Info
- Publication number
- JPH0422515Y2 JPH0422515Y2 JP19683385U JP19683385U JPH0422515Y2 JP H0422515 Y2 JPH0422515 Y2 JP H0422515Y2 JP 19683385 U JP19683385 U JP 19683385U JP 19683385 U JP19683385 U JP 19683385U JP H0422515 Y2 JPH0422515 Y2 JP H0422515Y2
- Authority
- JP
- Japan
- Prior art keywords
- case
- detection circuit
- shield plate
- proximity switch
- hole
- 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
- 238000001514 detection method Methods 0.000 claims description 42
- 239000002184 metal Substances 0.000 claims description 20
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000005611 electricity Effects 0.000 description 4
- 230000010355 oscillation Effects 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Landscapes
- Switches That Are Operated By Magnetic Or Electric Fields (AREA)
- Electronic Switches (AREA)
Description
【考案の詳細な説明】
〔考案の分野〕
本考案は所定の経路を通過する金属体を検出す
る貫通型の近接スイツチに関し、特に検出回路部
のシールド構造に特徴を有する近接スイツチに関
するものである。[Detailed Description of the Invention] [Field of the Invention] The present invention relates to a through-type proximity switch that detects a metal object passing through a predetermined path, and particularly relates to a proximity switch characterized by a shield structure of the detection circuit section. .
〔考案の概要〕
本考案による近接スイツチは、環状の検出コイ
ルと検出回路部及びこれらを保持するケースを有
し金属体を検出する近接スイツチにおいて、ケー
スの金属体が貫入する側の面に放電用の貫通孔を
設けると共に該ケース内面にシールド板を取付
け、該貫通孔を介して放電させることによつて検
出回路を保護するようにしたものである。[Summary of the invention] The proximity switch according to the invention detects a metal object, and has an annular detection coil, a detection circuit section, and a case that holds them. A shield plate is attached to the inner surface of the case, and the detection circuit is protected by allowing discharge to occur through the through hole.
所定の経路を通過するパチンコ球やコイン等を
検知するために環状に巻かれたコイルの中心を貫
通孔とし、そのコイルを発振コイルとした発振回
路を構成し、金属体の通過に基づく発振状態の変
化によつて金属体を検出する貫通型の近接スイツ
チが知られている。このような貫通型近接スイツ
チは金属体が帯電している場合や近接スイツチの
取付部が帯電している場合に、静電気が検出コイ
ルに通じて放電することがある。このとき検出コ
イルに接続されている検出回路部の電子素子が破
壊されたり、誤動作を生じることがあるという問
題点があつた。
In order to detect pachinko balls, coins, etc. passing through a predetermined path, a circularly wound coil has a through hole in the center, and an oscillation circuit is constructed using the coil as an oscillation coil, which generates an oscillation state based on the passage of a metal object. A through-type proximity switch is known that detects a metal object based on a change in . In such a penetrating proximity switch, if the metal body is charged or the mounting portion of the proximity switch is charged, static electricity may pass through the detection coil and be discharged. At this time, there was a problem that electronic elements of the detection circuit unit connected to the detection coil may be destroyed or malfunction may occur.
そこで出願人は既に実願昭59−62018号等にお
いて金属体が入り込む側面に所定の電位に接続さ
れた金属板を設けて内部回路をシールドするよう
にした近接スイツチを提案している。第３図はこ
のような従来の近接スイツチの一例を示す組立構
成図であつて、金属体が通過する六角形状を有す
る貫通孔１ａと検出コイル保持部１ｂ及びプリン
ト回路基板を保持する検出回路保持部１ｃが設け
られたケース１上にシールド板２及びプリント基
板３が取付けられる。シールド板２はケース１の
貫通孔１ａに対応した六角形状の貫通孔が設けら
れた環状部２ａと、検出回路保持部１ｃに対応し
た平板部２ｂ及び左右の側板２ｃ，２ｄから成り
立つている。そしてケース１にシールド板２を装
着しその上部より検知回路部を有するプリント基
板３と装着し、更に検出コイル保持部１ｂに図示
しないコイルボビンに巻かれた検出コイルを装着
して貫通型の近接スイツチを構成している。 Therefore, the applicant has already proposed a proximity switch in Utility Model Application No. 59-62018 etc. in which a metal plate connected to a predetermined potential is provided on the side surface into which the metal body enters to shield the internal circuit. FIG. 3 is an assembled configuration diagram showing an example of such a conventional proximity switch, which includes a hexagonal through hole 1a through which a metal object passes, a detection coil holder 1b, and a detection circuit holder that holds a printed circuit board. A shield plate 2 and a printed circuit board 3 are attached to the case 1 in which the portion 1c is provided. The shield plate 2 includes an annular portion 2a provided with a hexagonal through hole corresponding to the through hole 1a of the case 1, a flat plate portion 2b corresponding to the detection circuit holding portion 1c, and left and right side plates 2c and 2d. Then, a shield plate 2 is attached to the case 1, and a printed circuit board 3 having a detection circuit section is attached from the upper part of the shield plate 2. Furthermore, a detection coil wound around a coil bobbin (not shown) is attached to the detection coil holding section 1b, and a through-type proximity switch is installed. It consists of
このような従来の近接スイツチは、検知対象の
金属体が帯電している場合には貫通孔１ａを通過
する際にシールド板２の環状部２ａ、又は第４図
に示すようにケース１とカバー４との間隙を通過
して側板２ｃ又は２ｄの端部より放電する。従つ
て従来の近接スイツチではシールド板２に側板２
ｃ，２ｄが必要であり複数な形状のシールド板が
必要であつた。そのためシールド板２をケース１
に組み込んだ後その上部よりプリント基板３を装
着した場合には、その側板２ｃ，２ｄによつてプ
リント基板３が円滑に装着され難く組立作業性が
悪くなるという問題点があつた。 In such a conventional proximity switch, when the metal object to be detected is electrically charged, when it passes through the through hole 1a, it is connected to the annular part 2a of the shield plate 2 or to the case 1 and the cover as shown in FIG. 4 and discharges from the end of the side plate 2c or 2d. Therefore, in the conventional proximity switch, the side plate 2 is attached to the shield plate 2.
c, 2d were required, and shield plates of multiple shapes were required. Therefore, shield plate 2 is connected to case 1.
When the printed circuit board 3 is mounted from above after being assembled into the main body, there is a problem that the printed circuit board 3 is difficult to be mounted smoothly due to the side plates 2c and 2d, resulting in poor assembly workability.
本考案はこのような従来の近接スイツチの問題
点に鑑みてなされたものであつて、側板を通じて
静電気を放電させることなくシールド板の形状を
簡略化するようにした近接スイツチを提供するも
のである。
The present invention was devised in view of the problems of conventional proximity switches, and provides a proximity switch in which the shape of the shield plate is simplified without discharging static electricity through the side plate. .
本考案は環状の検出コイルと、検出回路部と、
中央に貫通孔が設けられた検出コイル保持部及び
検出回路保持部を有するケースと、を具備し、検
出コイルを貫通する金属体を検出する近接スイツ
チであつて、ケースの検出回路保持部の金属体が
貫入する面に放電用貫通孔を設けると共に、ケー
スの内面に所定の電位を有する端子に接続された
シールド板を設けたことを特徴とするものであ
る。
The present invention includes an annular detection coil, a detection circuit section,
A proximity switch for detecting a metal object penetrating the detection coil, comprising a case having a detection coil holding part and a detection circuit holding part provided with a through hole in the center, the metal of the detection circuit holding part of the case. The device is characterized in that a discharge through hole is provided on the surface through which the body penetrates, and a shield plate connected to a terminal having a predetermined potential is provided on the inner surface of the case.
このような特徴を有する本考案によれば、ケー
スの検出回路保持部の金属体が貫入する側の面に
貫通孔を設けているため、金属体が通過する際の
静電気はこの貫通孔を通つてシールド板に放電す
る。従つてケースとカバーの間隙より静電気が放
電することがないのでシールド板に側板を設ける
必要がなくなる。それ故シールド板は環状部と検
出回路保持部の内面を被う平板とすることがで
き、シールド板の構造が簡略となつて製造が容易
となる。又シールド板の上部より検出回路部を有
するプリント基板を挿入する際もシールド板の側
壁がないため挿入が容易となり、組立作業性を向
上させることができる。 According to the present invention having such characteristics, since the through hole is provided on the side of the detection circuit holding part of the case where the metal body penetrates, static electricity when the metal body passes through the through hole. and discharges to the shield plate. Therefore, since static electricity is not discharged from the gap between the case and the cover, there is no need to provide a side plate to the shield plate. Therefore, the shield plate can be a flat plate that covers the annular portion and the inner surface of the detection circuit holding portion, and the structure of the shield plate is simplified and manufacturing becomes easy. Furthermore, when inserting a printed circuit board having a detection circuit section from above the shield plate, since there is no side wall of the shield plate, the insertion becomes easy, and assembly work efficiency can be improved.
第１図は本考案の光電スイツチの一実施例を示
す組立構成図であり、第２図ａはこの光電スイツ
チの立面図、第２図ｂはそのＡ−Ａ線断面図、第
２図ＣはそのＢ−Ｂ線拡大断面図である。本実施
例においても貫通孔１０ａと検出コイル保持部１
０ｂ及び検出回路保持部１０ｃから成るケース１
０上にシールド板１１及びプリント基板１２が装
着される。さて本実施例ではケース１０のプリン
ト基板保持部１０ｃに図示のように２つの貫通孔
１３ａ，１３ｂを設けている。そしてケース１０
に左右の側板を除いて前述したシールド板２と同
じく環状部１１ａ、平板部１１ｂを有するシール
ド板１１が取付けられ、更にその上部に前述した
従来例と同一の検出回路が実装されたプリント基
板１２を取付ける。シールド板１１は検出回路部
の所定電位となるように、例えばアース端に接続
しておくのものとする。そして第２図ｂに示すよ
うにケース１０の検出コイル保持部１０ｂにボビ
ン１４に巻かれたコイル１５が取付け、プリント
基板１２上の検知回路部に接続しカバー１６によ
つて密閉して近接スイツチを形成する。
FIG. 1 is an assembled configuration diagram showing an embodiment of the photoelectric switch of the present invention, FIG. C is an enlarged sectional view taken along the line B-B. Also in this embodiment, the through hole 10a and the detection coil holding portion 1
Case 1 consisting of 0b and detection circuit holding section 10c
0, a shield plate 11 and a printed circuit board 12 are attached. In this embodiment, the printed circuit board holding portion 10c of the case 10 is provided with two through holes 13a and 13b as shown in the figure. And case 10
A shield plate 11 having an annular portion 11a and a flat plate portion 11b similar to the shield plate 2 described above except for the left and right side plates is attached to the shield plate 11, and a printed circuit board 12 on which the same detection circuit as the conventional example described above is mounted. Install. It is assumed that the shield plate 11 is connected to, for example, a ground terminal so as to have a predetermined potential of the detection circuit section. Then, as shown in FIG. 2b, the coil 15 wound around the bobbin 14 is attached to the detection coil holding portion 10b of the case 10, connected to the detection circuit section on the printed circuit board 12, and sealed with a cover 16 to operate the proximity switch. form.
こうして構成された近接スイツチにおいて、第
２図ｂ，ｃに矢印ｃで示すようにケース１０の検
出回路保持部１０ｃの面よりパチンコ球等の金属
体を通過させると、通過時の発振状態の変化によ
りその通過を検出することができる。そして金属
体が帯電している場合にはこの近接スイツチを通
過する際にシールド板１１に放電する。第２図ｃ
はこの放電経路を示す図であつて、帯電した金属
体が近接スイツチの貫通孔を通過する際には破線
で示すようにケース１０の上面に設けられた貫通
孔１３ａ，１３ｂを通過してシールド板１１の平
板部１１ｂに放電する。従つてケース１０内部の
検知回路部を放電から保護することができる。 In the proximity switch configured in this manner, when a metal object such as a pachinko ball is passed from the surface of the detection circuit holding portion 10c of the case 10 as shown by the arrow c in FIGS. 2b and 2c, the oscillation state changes when it passes. Its passage can be detected by If the metal body is electrically charged, it will be discharged to the shield plate 11 when passing through this proximity switch. Figure 2c
is a diagram showing this discharge path, and when the charged metal body passes through the through hole of the proximity switch, it passes through the through holes 13a and 13b provided on the top surface of the case 10, as shown by the broken line, and is connected to the shield. A discharge is generated on the flat plate portion 11b of the plate 11. Therefore, the detection circuit section inside the case 10 can be protected from electric discharge.
ここで貫通孔１３ａ，１３ｂを設けていない場
合には、第４図に示すようにケース１０ａの側壁
を通過してシールド板を端部に放電するため放電
経路が長くなる。従来例ではこの放電を確実にす
るために側板を設けているが、本考案では放電用
の貫通孔１３ａ，１３ｂを設けておくことによつ
てこの貫通孔１３ａ，１３ｂを通過して確実に帯
電した金属体を放電させることができ、検出回路
部の素子の破壊や誤動作を防止することができ
る。 If the through holes 13a and 13b are not provided, the discharge path becomes long because the discharge passes through the side wall of the case 10a to the end of the shield plate, as shown in FIG. In the conventional example, a side plate is provided to ensure this discharge, but in the present invention, by providing through holes 13a and 13b for discharge, it is possible to ensure that the electrification passes through the through holes 13a and 13b. It is possible to discharge the metal body caused by the metal body, and it is possible to prevent the elements of the detection circuit from being destroyed or malfunctioning.
尚本実施例はケース１０の上面に２つの貫通孔
１３ａ，１３ｂを設けているが、ケースの側壁を
通過して放電が起こらないようにケース１０のプ
リント基板保持部１０ｃの形状に対応して貫通孔
を設けることが必要である。即ち第２図に示すケ
ースの上面の全ての位置、例えば端部Ｐ１で貫通
孔１３ａまでの距離l1がその位置からケースの側
板を通過したシールド板１１に達するまでの距離
l2より短くなるように設定する。従つてケース１
０の検出回路保持部１０ｃが長手方向に大きくな
れば更に多数の放電用貫通孔を設けることが必要
となる。 In this embodiment, two through holes 13a and 13b are provided on the upper surface of the case 10, but they are made in accordance with the shape of the printed circuit board holding portion 10c of the case 10 to prevent discharge from passing through the side wall of the case. It is necessary to provide through holes. That is, at all positions on the upper surface of the case shown in FIG. 2, for example, the distance l1 from the end P1 to the through hole 13a is the distance from that position to the shield plate 11 that has passed through the side plate of the case.
l Set it to be shorter than 2 . Therefore, case 1
If the zero detection circuit holding portion 10c becomes larger in the longitudinal direction, it will be necessary to provide a larger number of discharge through holes.
第１図は本考案による近接スイツチの一実施例
を示す組立構成図、第２図ａはその立面図、第２
図ｂはＡ−Ａ線断面図、第２図ｃはＢ−Ｂ線断面
図であつて放電経路を示す図、第３図は従来の近
接スイツチの一実施例を示す組立構成図、第４図
はその放電経路を示す断面図である。
１，１０……ケース、１ａ，１０ａ……貫通
孔、１ｂ，１０ｂ……検出コイル保持部、１ｃ，
１０ｃ……検出回路保持部、２，１１……シール
ド板、３，１２……プリント基板、１３ａ，１３
ｂ……貫通孔、１５……検出コイル、１６……カ
バー。
Fig. 1 is an assembled configuration diagram showing an embodiment of the proximity switch according to the present invention, Fig. 2a is an elevational view thereof, and Fig.
Figure b is a sectional view taken along the line A-A, Figure 2 c is a sectional view taken along the line B-B, showing the discharge path, Figure 3 is an assembled configuration diagram showing one embodiment of a conventional proximity switch, and Figure 4 is a cross-sectional view taken along the line B-B. The figure is a sectional view showing the discharge path. 1, 10... Case, 1a, 10a... Through hole, 1b, 10b... Detection coil holding part, 1c,
10c...Detection circuit holding part, 2, 11...Shield plate, 3, 12...Printed circuit board, 13a, 13
b...Through hole, 15...Detection coil, 16...Cover.
Claims (1)
貫通孔が設けられた検出コイル保持部及び検出
回路保持部を有するケースと、を具備し、前記
検出コイルを貫通する金属体を検出する近接ス
イツチにおいて、 前記ケースの検出回路保持部の金属体が貫入
する面に放電用貫通孔を設けると共に、 前記ケースの内面に所定の電位を有する端子
に接続されたシールド板を設けたことを特徴と
する近接スイツチ。 (2) 前記シールド板は、前記ケースの検出コイル
保持部に対応した形状の環状部と検出回路保持
部に対応した平板から成ることを特徴とする実
用新案登録請求の範囲第１項記載の近接スイツ
チ。[Claims for Utility Model Registration] (1) A case comprising an annular detection coil, a detection circuit section, a detection coil holding section provided with a through hole in the center, and a detection circuit holding section; In a proximity switch that detects a metal object penetrating a coil, a discharge through hole is provided on the surface of the detection circuit holding portion of the case through which the metal object penetrates, and the hole is connected to a terminal having a predetermined potential on the inner surface of the case. A proximity switch characterized by being equipped with a shield plate. (2) The shield plate is characterized in that the shield plate is composed of an annular portion having a shape corresponding to the detection coil holding portion of the case and a flat plate corresponding to the detection circuit holding portion. Switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19683385U JPH0422515Y2 (en) | 1985-12-20 | 1985-12-20 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19683385U JPH0422515Y2 (en) | 1985-12-20 | 1985-12-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62103145U JPS62103145U (en) | 1987-07-01 |
| JPH0422515Y2 true JPH0422515Y2 (en) | 1992-05-22 |
Family
ID=31156001
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19683385U Expired JPH0422515Y2 (en) | 1985-12-20 | 1985-12-20 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0422515Y2 (en) |
-
1985
- 1985-12-20 JP JP19683385U patent/JPH0422515Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62103145U (en) | 1987-07-01 |
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