JPH0358040U

JPH0358040U -

Info

Publication number: JPH0358040U
Application number: JP11848089U
Authority: JP
Priority date: 1989-10-09
Filing date: 1989-10-09
Publication date: 1991-06-05

Description

[Brief explanation of the drawing]

第１図は、この考案の一実施例を示す高周波発
振形の近接スイツチの回路ブロツク図、第２図Ａ
、第２図Ｂ、第２図Ｃは、上記実施例近接スイツ
チを構成する発振回路の同調回路を並列同調タイ
プの回路例を示す図、第３図Ａ、第３図Ｂ、第３
図Ｃは、上記実施例近接スイツチの発振回路に使
用される直列同調型の同調回路の回路例を示す図
、第４図は、従来の高周波発振形の近接スイツチ
を示す回路ブロツク図、第５図は、同近接スイツ
チの発振回路の回路例を示す回路図である。１……発振回路、１ａ……同調回路、２……積
分回路、３……弁別回路、４……論理処理回路、
５……出力回路、Ｐ_１……出力端子、Ｐ_２……グ
ランド端子、Ｐ_４……周波数切替端子、Ｃ，Ｃ_１，Ｃ_２……コンデンサ、Ｌ，Ｌ_１，Ｌ_２……同調
用コイル。 Fig. 1 is a circuit block diagram of a high frequency oscillation type proximity switch showing one embodiment of this invention, and Fig. 2A
, FIG. 2B and FIG. 2C are diagrams showing examples of parallel tuning type tuning circuits of the oscillation circuit constituting the proximity switch of the above embodiment, FIG. 3A, FIG. 3B, and FIG.
Figure C is a diagram showing a circuit example of a series tuned type tuning circuit used in the oscillation circuit of the proximity switch of the above embodiment, Figure 4 is a circuit block diagram showing a conventional high frequency oscillation type proximity switch, and Figure 5 is a circuit diagram showing a conventional high frequency oscillation type proximity switch. The figure is a circuit diagram showing an example of the oscillation circuit of the proximity switch. 1... Oscillation circuit, 1a... Tuning circuit, 2... Integrating circuit, 3... Discrimination circuit, 4... Logic processing circuit,
5...Output circuit, _P1 ...Output terminal, _P2 ...Ground terminal, _P4 ...Frequency switching terminal, C, _C1 , C ₂ ... Capacitor, L, L ₁ , L ₂ ... Tuning coil.

Claims

[Claims for Utility Model Registration] A high frequency oscillation type proximity switch equipped with an oscillation circuit including a tuned circuit consisting of a coil and a capacitor, provided with a terminal connected to a point in the tuned circuit, and this terminal is connected to ground. A proximity switch characterized in that the oscillation frequency of the oscillation circuit is switched to either the first frequency or the second frequency depending on whether the oscillation frequency is the first frequency or the second frequency.