JPH02103833A - Contactless switch - Google Patents
Contactless switchInfo
- Publication number
- JPH02103833A JPH02103833A JP25544688A JP25544688A JPH02103833A JP H02103833 A JPH02103833 A JP H02103833A JP 25544688 A JP25544688 A JP 25544688A JP 25544688 A JP25544688 A JP 25544688A JP H02103833 A JPH02103833 A JP H02103833A
- Authority
- JP
- Japan
- Prior art keywords
- cable
- molding resin
- oscillation coil
- printed wiring
- closed container
- 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.)
- Pending
Links
- 239000011347 resin Substances 0.000 claims abstract description 28
- 229920005989 resin Polymers 0.000 claims abstract description 28
- 230000010355 oscillation Effects 0.000 claims abstract description 25
- 238000000465 moulding Methods 0.000 abstract description 15
- 239000000758 substrate Substances 0.000 abstract 3
- 239000000470 constituent Substances 0.000 abstract 2
- 238000001514 detection method Methods 0.000 description 5
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000013459 approach Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
Abstract
Description
この発明は、近接スイッチに関し、特に、発振コイル、
プリント配線基板及びケーブル端末を成形樹脂で被覆し
て一体的に構成した一体成形型の高周波発振形近接スイ
ッチに関する。The present invention relates to a proximity switch, and in particular, an oscillation coil,
The present invention relates to an integrally molded high frequency oscillation type proximity switch in which a printed wiring board and a cable end are coated with a molded resin.
高周波発振形近接スイッチは検出面に接近する物体を接
触することなく検出するもので、発振コイルを含む検出
回路、この検出回路からの信号によりスイッチング動作
をさせる出力回路、動作表示灯などを備えている。そし
て、発振コイルから出る高周波の磁界中に金属物体が接
近すると、発振コイルのインピーダンスが変化して検出
回路から出力回路に信号が送られ、トランジスタなどの
スイッチング素子が動作する。
この種の近接スイッチとして、従来、第４図に示すもの
が知られている。第４図において、１は発振コイル、２
は検出回路などの各種回路及び動作表示用ＬＥＤ３を搭
載したプリント配線基板、４はプリント配線基板２に接
続されたケーブルである。
ここで、図示近接スイッチは、発振コイル１、プリント
配線基板２及びケーブル４の端末をインサート成形によ
り成形樹脂５で被覆して一体的に構成した一体成形型の
ものである。その樹脂成形は、相互の配線をした発振コ
イル１、動作表示用ＬＥＤ３を搭載したプリント配線基
板２及びケーブル４の端末を金型内に位置決めして樹脂
を射出することにより行う。A high-frequency oscillation type proximity switch detects an object approaching the detection surface without contacting it, and is equipped with a detection circuit including an oscillation coil, an output circuit that performs switching operation based on the signal from this detection circuit, an operation indicator light, etc. There is. When a metal object approaches the high-frequency magnetic field emitted by the oscillation coil, the impedance of the oscillation coil changes, a signal is sent from the detection circuit to the output circuit, and a switching element such as a transistor is activated. As this type of proximity switch, the one shown in FIG. 4 is conventionally known. In Fig. 4, 1 is an oscillation coil, 2
4 is a printed wiring board mounted with various circuits such as a detection circuit and an LED 3 for displaying operation, and 4 is a cable connected to the printed wiring board 2. Here, the illustrated proximity switch is of an integrally molded type in which the oscillation coil 1, the printed wiring board 2, and the terminal of the cable 4 are coated with a molded resin 5 by insert molding. The resin molding is performed by positioning the interconnected oscillation coil 1, the printed wiring board 2 equipped with the operation display LED 3, and the terminal of the cable 4 in a mold and injecting the resin.
ところで、上に述べた従来の一体成形型近接スインチで
は、発振コイル１、プリント配線基板２、動作表示用Ｌ
ＥＤ３及びケーブル４の端末のすべてに直接成形樹脂５
が触れるため、成形樹脂の射出の際の圧力、温度により
構成部品が破損したり、その特性が変化したりするとい
う問題があった。
また、樹脂の影響による構成部品の特性変化もあるため
、使用できる樹脂の範囲が限られていた。
そこで、この発明は、発振コイルやプリント配線基板に
成形樹脂が直接触れないようにして、構成部品の破損や
特性変化を防止し、また樹脂の選択範囲を拡げた近接ス
イッチを提供することを目的とするものである。By the way, in the conventional integrally molded proximity swing described above, the oscillation coil 1, the printed wiring board 2, and the operation display L
Direct molding resin 5 on all terminals of ED 3 and cable 4
There is a problem that the components may be damaged or their properties may change due to the pressure and temperature during injection of the molded resin. Furthermore, the range of resins that can be used is limited because the characteristics of the component parts change due to the influence of the resin. Therefore, an object of the present invention is to provide a proximity switch that prevents molded resin from coming into direct contact with the oscillation coil or printed wiring board, thereby preventing damage to component parts or changes in characteristics, and expanding the range of resin selection. That is.
上記目的を達成するために、この発明の近接スイッチは
、発振コイル、プリント配線基板及びケーブル端末を密
閉容器内に保持させ、そのまわりを成形樹脂で被覆して
構成するものとする。In order to achieve the above object, the proximity switch of the present invention is constructed by holding an oscillation coil, a printed wiring board, and a cable terminal in a sealed container, and covering the periphery with molded resin.
【作 用】
発振コイル、プリント配線基板及びケーブル端末を密閉
容器内に収容したので、構成部品は成形樹脂の影響を受
けることがなくなる。[Function] Since the oscillation coil, printed wiring board, and cable terminal are housed in a sealed container, the component parts are not affected by the molded resin.
第１図〜第３図はこの発明の実施例を示し、第１図は縦
断面図、第２図は発振コイル、プリント配線基板及びケ
ーブル端末を収容した密閉容器の外観を示す斜視図、第
３図はその分解斜視図である。なお、従来例と同一部分
には同一の符号を付は説明を省略する。
まず、第３図において、６は透明なモールド樹脂からな
る密閉容器で、ケース７とカバー８とからなっている。
ケース７は、庇付円筒状の発振コイル保持部７ａと箱状
のプリント配線基板保持部７ｂとからなるが、プリント
配線基板保持部７ｂの上面には動作表示用ＬＥＤ３を臨
ませる表示部７Ｃが形成され、更に一端にはケーブル４
を通す半円形の切欠７ｄが形成されている。なお、ケー
ス７の側面に突出した腕７ｅは、成形時に密閉容器７を
金型内に保持させるためのもので、成形後に切り取られ
る。また、カバー８は板状で、その周縁にはケース７の
下端縁を嵌め込む溝８ａが巡らされており、さらに一端
にケーブル４を通ず半円形の切欠８ｂを持つケーブル押
さえ８Ｃが設けられている。
密閉容器６に発振コイル１等を組み込むには、まず、プ
リント配線基板２との間の配線を終わった発振コイル１
を発振コイル保持部７ａに、その前面が発振コイル保持
部７ａの底部に突き当たるまで圧入する。次いで、ケー
ブル４を接続したプリント配線基板面２をケース７のプ
リント配線基板保持部７ｂに、その上面がプリント配線
基板７ｂの側壁及び前壁の段部７ｆ（第１図）に突き当
たるまで圧入する。その後、カバー８の溝８ａにケース
７の下端縁を圧入して、ケース７にカバー８を被せる。
その際、ケース７とカバー８のケーブル引出部はケーブ
ル４の外皮に弾性的に食い込み、その部分のシールを行
う。
第２図は、このようにして発振コイル１、動作表示用Ｌ
ＥＤ３を搭載したプリント配線基板２及びケーブル４の
端末を保持した密閉容器６の外観をを示すものである。
この密閉容器６は、腕７ｅを介して図示しない金型内に
保持され、インサート成形される。そのとき、樹脂の射
出圧力が第２図の矢印Ａ方向からかかるように射出ゲー
ト位置を定めれば、カバー８はケース７に強く押しつけ
られて密着し、密閉容器６内への成形樹脂の流入を阻止
する上で有利となる。
第１図は密閉容器６のまわりを成形樹脂で被覆した状態
を示す。表示部７０部分には成形樹脂被膜がなく、動作
表示用ＬＥＤ３の光は透明なケース７を通して外部へ導
かれる。図から明らかなとおり、発振コイル１、プリン
ト配線基板２、動作表示用Ｌ Ｅ Ｄ ３及びケーブル
４の端末は密閉容器６により成形樹脂５から隔離されて
おり、その影響を免れている。1 to 3 show embodiments of the present invention, with FIG. 1 being a longitudinal sectional view, FIG. FIG. 3 is an exploded perspective view thereof. Note that the same parts as those in the conventional example are denoted by the same reference numerals, and the explanation thereof will be omitted. First, in FIG. 3, reference numeral 6 denotes an airtight container made of transparent molded resin, which consists of a case 7 and a cover 8. The case 7 consists of a cylindrical oscillation coil holding part 7a with an eave and a box-shaped printed wiring board holding part 7b, and a display part 7C that faces the operation display LED 3 is provided on the top surface of the printed wiring board holding part 7b. and a cable 4 at one end.
A semicircular notch 7d is formed through which the hole is passed. Note that the arm 7e protruding from the side surface of the case 7 is for holding the closed container 7 in the mold during molding, and is cut off after molding. The cover 8 is plate-shaped and has a groove 8a around its periphery into which the lower edge of the case 7 is fitted, and a cable retainer 8C having a semicircular notch 8b through which the cable 4 is passed is provided at one end. ing. In order to incorporate the oscillation coil 1 etc. into the airtight container 6, first, the oscillation coil 1, which has been wired with the printed wiring board 2, is
is press-fitted into the oscillation coil holding part 7a until its front surface hits the bottom of the oscillation coil holding part 7a. Next, the printed wiring board surface 2 to which the cable 4 is connected is press-fitted into the printed wiring board holding portion 7b of the case 7 until its upper surface abuts against the side wall and the stepped portion 7f (FIG. 1) of the front wall of the printed wiring board 7b. . Thereafter, the lower edge of the case 7 is press-fitted into the groove 8a of the cover 8, and the cover 8 is placed over the case 7. At this time, the cable pull-out portions of the case 7 and the cover 8 elastically bite into the outer skin of the cable 4 and seal that portion. Figure 2 shows how the oscillation coil 1 and the operation display L
It shows the appearance of a sealed container 6 that holds a printed wiring board 2 on which an ED 3 is mounted and a terminal of a cable 4. This airtight container 6 is held in a mold (not shown) via an arm 7e, and is insert-molded. At this time, if the injection gate position is determined so that the injection pressure of the resin is applied from the direction of arrow A in FIG. This is advantageous in preventing. FIG. 1 shows a state in which the periphery of the closed container 6 is covered with molded resin. There is no molded resin coating on the display portion 70, and the light from the operation display LED 3 is guided to the outside through the transparent case 7. As is clear from the figure, the oscillation coil 1, the printed wiring board 2, the operation display LED 3, and the terminal of the cable 4 are isolated from the molded resin 5 by the airtight container 6, and are thus freed from its influence.
この発明によれば、構成部品が成形樹脂の影響を受けな
いので、成形樹脂による構成部品の破損や特性変化をな
くすことができ、外力に弱い部品や特性変化の大きい部
品のインサート成形が可能となる。また、成形樹脂につ
いても部品への影響を考慮しなくてもよいため、その選
択の範囲が拡がる。According to this invention, since the component parts are not affected by the molding resin, damage to the component parts and property changes due to the molding resin can be eliminated, and insert molding of parts that are vulnerable to external forces or parts that have large property changes is possible. Become. Moreover, since there is no need to consider the influence on the parts regarding the molding resin, the range of selection thereof is expanded.
第１図はこの発明の実施例の縦断面図、第２図は発振コ
イル、プリント配線基板及びケーブル端末を保持した密
閉容器の外観を示す斜視図、第３図は第２図の分解斜視
図、第４図は従来例の縦断面図である。Fig. 1 is a longitudinal sectional view of an embodiment of the present invention, Fig. 2 is a perspective view showing the external appearance of an airtight container holding an oscillation coil, a printed wiring board, and a cable terminal, and Fig. 3 is an exploded perspective view of Fig. 2. , FIG. 4 is a longitudinal sectional view of a conventional example.
Claims (1)
密閉容器内に保持させ、そのまわりを成形樹脂で被覆し
て構成したことを特徴とする近接スイッチ。1) A proximity switch characterized in that an oscillation coil, a printed wiring board, and a cable terminal are held in a sealed container and the surroundings are covered with molded resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25544688A JPH02103833A (en) | 1988-10-11 | 1988-10-11 | Contactless switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25544688A JPH02103833A (en) | 1988-10-11 | 1988-10-11 | Contactless switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02103833A true JPH02103833A (en) | 1990-04-16 |
Family
ID=17278883
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25544688A Pending JPH02103833A (en) | 1988-10-11 | 1988-10-11 | Contactless switch |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02103833A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0452345U (en) * | 1990-09-12 | 1992-05-01 | ||
| US5794469A (en) * | 1992-10-12 | 1998-08-18 | Kabushiki Kaisha Tokai Rika Denki Sesakusho | Steering lock device |
| JPWO2006137247A1 (en) * | 2005-06-21 | 2009-01-08 | アサ電子工業株式会社 | Cylinder control unit |
-
1988
- 1988-10-11 JP JP25544688A patent/JPH02103833A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0452345U (en) * | 1990-09-12 | 1992-05-01 | ||
| US5794469A (en) * | 1992-10-12 | 1998-08-18 | Kabushiki Kaisha Tokai Rika Denki Sesakusho | Steering lock device |
| JPWO2006137247A1 (en) * | 2005-06-21 | 2009-01-08 | アサ電子工業株式会社 | Cylinder control unit |
| JP4662378B2 (en) * | 2005-06-21 | 2011-03-30 | アサ電子工業株式会社 | Cylinder control unit |
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