JPS6273637U - - Google Patents
Info
- Publication number
- JPS6273637U JPS6273637U JP16480385U JP16480385U JPS6273637U JP S6273637 U JPS6273637 U JP S6273637U JP 16480385 U JP16480385 U JP 16480385U JP 16480385 U JP16480385 U JP 16480385U JP S6273637 U JPS6273637 U JP S6273637U
- Authority
- JP
- Japan
- Prior art keywords
- proximity switch
- oscillation circuit
- capacitive proximity
- transistor
- resistance value
- 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
- 238000001514 detection method Methods 0.000 claims description 5
- 230000010355 oscillation Effects 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
Landscapes
- Electronic Switches (AREA)
Description
第１図は本考案による静電容量型近接スイツチ
の発振回路の一実施例を示す回路図、第２図はス
イツチＳＷ１を閉成したときの可変抵抗Ｒ５の抵
抗値に対する検出距離ｌの変化を示す動作曲線、
第３図は従来の近接スイツチの発振回路の一例を
示す回路図、第４図は検出距離に対する静電容量
Ｃｏの変化を示すグラフ、第５図は可変抵抗Ｒ５
に対する検出距離ｌの変化を示すグラフである。
１……検出用電極、Ｃｏ……静電容量、Ｃ１，
Ｃ２……コンデンサ、Ｔｒ１，Ｔｒ２……トラン
ジスタ、Ｒ１〜Ｒ４，Ｒ６，Ｒ７……抵抗、Ｒ５
……可変抵抗、ＳＷ１……スイツチ。
Fig. 1 is a circuit diagram showing an embodiment of the oscillation circuit of the capacitive proximity switch according to the present invention, and Fig. 2 shows the change in detection distance l with respect to the resistance value of variable resistor R5 when switch SW1 is closed. The operating curve shown,
Fig. 3 is a circuit diagram showing an example of the oscillation circuit of a conventional proximity switch, Fig. 4 is a graph showing changes in capacitance Co with respect to detection distance, and Fig. 5 is a variable resistor R5.
3 is a graph showing a change in detection distance l with respect to FIG. 1...Detection electrode, Co...Capacitance, C1,
C2... Capacitor, Tr1, Tr2... Transistor, R1 to R4, R6, R7... Resistor, R5
...Variable resistor, SW1...Switch.
Claims (1)
つて振幅が変化する発振回路を有する静電容量型
近接スイツチであつて、 前記発振回路は、第１、第２のトランジスタが
接続された増幅回路を有し、該第２のトランジス
タのエミツタに発振回路の正帰還量を調整する可
変抵抗器を含む直列抵抗体を設けると共に、該抵
抗体の一部を短絡するスイツチ手段を有すること
を特徴とする静電容量型近接スイツチ。 (2) 前記直列抵抗体のスイツチ手段により短絡
される抵抗値は、固定抵抗より充分小さい抵抗値
としたことを特徴とする実用新案登録請求の範囲
第１項記載の静電容量型近接スイツチ。[Claims for Utility Model Registration] (1) A capacitive proximity switch having an oscillation circuit whose amplitude changes depending on a change in capacitance between a detection electrode and the ground, the oscillation circuit comprising: 1. It has an amplifier circuit connected to a second transistor, and a series resistor including a variable resistor for adjusting the amount of positive feedback of the oscillation circuit is provided at the emitter of the second transistor, and one of the resistors 1. A capacitive proximity switch characterized by having a switch means for short-circuiting a capacitance type proximity switch. (2) The capacitive proximity switch according to claim 1, wherein the resistance value short-circuited by the switching means of the series resistor is a resistance value that is sufficiently smaller than a fixed resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16480385U JPS6273637U (en) | 1985-10-25 | 1985-10-25 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16480385U JPS6273637U (en) | 1985-10-25 | 1985-10-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6273637U true JPS6273637U (en) | 1987-05-12 |
Family
ID=31094258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16480385U Pending JPS6273637U (en) | 1985-10-25 | 1985-10-25 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6273637U (en) |
-
1985
- 1985-10-25 JP JP16480385U patent/JPS6273637U/ja active Pending