JPH03130627U - - Google Patents
Info
- Publication number
- JPH03130627U JPH03130627U JP3941290U JP3941290U JPH03130627U JP H03130627 U JPH03130627 U JP H03130627U JP 3941290 U JP3941290 U JP 3941290U JP 3941290 U JP3941290 U JP 3941290U JP H03130627 U JPH03130627 U JP H03130627U
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- circuit
- resonant circuit
- emitter
- base
- 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.)
- Granted
Links
- 239000000758 substrate Substances 0.000 claims description 4
- 230000010355 oscillation Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 239000003990 capacitor Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 1
Landscapes
- Pinball Game Machines (AREA)
- Electronic Switches (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Description
第１図は本考案の一実施例による金属球検出用
近接スイツチに用いられる発振回路の回路図、第
２図は本実施例に用いられるサブストレート型Ｐ
ＮＰトランジスタを示すＩＣ内の構成図、第３図
及び第４図は調整用抵抗の抵抗値を変化させたと
きの発振回路の出力波形を示す波形図、第５図は
電波による禁止効果が得られる範囲の抵抗値に対
する変化を示すグラフである。
１……共振回路、２……電流ミラー回路、Ｔｒ
１〜Ｔｒ３……トランジスタ、Ｔｒ４……サブス
トレート型ＰＮＰトランジスタ。
Figure 1 is a circuit diagram of an oscillation circuit used in a proximity switch for metal ball detection according to an embodiment of the present invention, and Figure 2 is a substrate type P switch used in this embodiment.
Figures 3 and 4 are waveform diagrams showing the output waveform of the oscillation circuit when the resistance value of the adjustment resistor is changed, and Figure 5 is a diagram showing the internal configuration of the IC that shows the NP transistor. FIG. 1... Resonant circuit, 2... Current mirror circuit, Tr
1 to Tr3...transistor, Tr4...substrate type PNP transistor.
Claims (1)
たＬＣ共振回路と、 第１、第２のトランジスタから成り前記ＬＣ共
振回路の他端に第１のトランジスタが接続され、
前記ＬＣ共振回路に電流を正帰還する電流ミラー
回路と、 前記ＬＣ共振回路の一端にベースが接続され前
記電流ミラー回路の第２のトランジスタとの間に
接続された第３のトランジスタと、を具備する近
接スイツチ発振回路において、 前記第３のトランジスタのエミツタ端の出力が
そのベースに与えられ、コレクタがサブストレー
トとして形成され、そのエミツタはエミツタ抵抗
を介して電源に接続して構成されたサブストレー
ト型ＰＮＰトランジスタのエミツタフオロワ回路
と、 前記第３のトランジスタのベースと共振回路と
の間に接続され、前記サブストレート型ＰＮＰト
ランジスタによる電波検知レベルを調整する調整
用抵抗と、を具備することを特徴とする近接スイ
ツチ発振回路。[Claims for Utility Model Registration] An LC resonant circuit comprising a coil and a capacitor, one end of which is grounded, and a first transistor comprising a first transistor and a second transistor, the first transistor being connected to the other end of the LC resonant circuit,
A current mirror circuit that positively feeds back current to the LC resonant circuit; and a third transistor having a base connected to one end of the LC resonant circuit and connected between the second transistor of the current mirror circuit. In a proximity switch oscillator circuit, the output of the emitter end of the third transistor is applied to its base, its collector is formed as a substrate, and its emitter is connected to a power supply via an emitter resistor. It is characterized by comprising an emitter follower circuit of a type PNP transistor, and an adjustment resistor connected between the base of the third transistor and the resonant circuit to adjust the radio wave detection level by the substrate type PNP transistor. Proximity switch oscillation circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3941290U JP2504989Y2 (en) | 1990-04-11 | 1990-04-11 | Proximity switch oscillator circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3941290U JP2504989Y2 (en) | 1990-04-11 | 1990-04-11 | Proximity switch oscillator circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03130627U true JPH03130627U (en) | 1991-12-27 |
| JP2504989Y2 JP2504989Y2 (en) | 1996-07-24 |
Family
ID=31548300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3941290U Expired - Fee Related JP2504989Y2 (en) | 1990-04-11 | 1990-04-11 | Proximity switch oscillator circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2504989Y2 (en) |
-
1990
- 1990-04-11 JP JP3941290U patent/JP2504989Y2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2504989Y2 (en) | 1996-07-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |