JPH0725625U - Photoelectric switch - Google Patents
Photoelectric switchInfo
- Publication number
- JPH0725625U JPH0725625U JP5745393U JP5745393U JPH0725625U JP H0725625 U JPH0725625 U JP H0725625U JP 5745393 U JP5745393 U JP 5745393U JP 5745393 U JP5745393 U JP 5745393U JP H0725625 U JPH0725625 U JP H0725625U
- Authority
- JP
- Japan
- Prior art keywords
- unit
- output
- amplification
- section
- light
- 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.)
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Abstract
(57)【要約】
【目的】 透明度の比較的高い被検出体を検出す
る場合の、信頼性の高い光電スイッチの回路を提案す
る。
【構成】 2段目の増幅部の交流増幅を行なうオ
ペアンプの入力端と出力端にダイオ−ドと抵抗の並列回
路を設けた光電スイッチ。
(57) [Abstract] [Purpose] We propose a highly reliable photoelectric switch circuit for detecting an object with relatively high transparency. [Structure] A photoelectric switch in which a parallel circuit of a diode and a resistor is provided at an input terminal and an output terminal of an operational amplifier which performs AC amplification of a second-stage amplifier.
Description
【0001】[0001]
透明度の比較的高い被検出体を検出する光電スイッチに関する。 The present invention relates to a photoelectric switch that detects an object having a relatively high degree of transparency.
【0002】[0002]
図1において、発光回路部のクロックパルス部1および増幅部2によって、発 光部3から発光部3から発光ダイオ−ド等によって赤外線による光線が受光部4 へ投光される。受光部4で受光した後、電気的に受光信号として変換され、更に 増幅器5により増幅され、フィルタ−回路部6を通過することにより、外乱光の 成分が取り除かれ、更に検波回路部7で検波され、比較回路部8で一定レベル以 上の信号を本来の受光信号として選択をし、その後積分回路部9で更にノイズに 対して遅延性を、持たせて誤動作防止を行ない出力を得ている。但しビニ−ルの ような透明度の高い被検出体を検出する場合、わずかな光でも検出しなければな らないため、増幅部の検出感度を上げるが、その結果受光部から直接入力する外 乱光、あるいは内部の増幅部からの内部雑音を拾いやすくなり誤動作しやすくな る点があった。 In FIG. 1, the clock pulse unit 1 and the amplification unit 2 of the light emitting circuit unit emit light rays of infrared rays from the light emitting unit 3 to the light emitting unit 3 to the light receiving unit 4 by the light emitting diode or the like. After being received by the light receiving section 4, it is electrically converted into a light receiving signal, further amplified by the amplifier 5, and passed through the filter-circuit section 6 to remove the disturbance light component, and further detected by the detection circuit section 7. Then, the comparison circuit section 8 selects a signal above a certain level as the original received light signal, and then the integration circuit section 9 further delays against noise to prevent malfunction and obtain an output. . However, when detecting a highly transparent object such as vinyl, it is necessary to detect even a small amount of light, so the detection sensitivity of the amplifier is increased, but as a result, the disturbance directly input from the light receiver is detected. There was a point that it was easy to pick up light or internal noise from the internal amplification section, and malfunctions were likely to occur.
【0003】[0003]
透明度の高い被検出体を検出する場合、外乱光やノイズに対して誤動作しにく い光電スイッチの回路を提案する。 When detecting a highly transparent object, we propose a photoelectric switch circuit that does not easily malfunction due to ambient light or noise.
【0004】[0004]
2段目の増幅部を構成する、交流増幅を行なうオペアンプの入力端と出力端に 外乱光によるノイズを消去することを目的として、ダイオ−ドと抵抗の並列回路 を設ける。 A parallel circuit of a diode and a resistor is provided at the input end and the output end of an operational amplifier for AC amplification, which constitutes the second-stage amplification section, for the purpose of eliminating noise due to ambient light.
【0005】[0005]
透明度の比較的高い被検出体を検出する信頼性の高い光電スイッチが得られる 。 It is possible to obtain a highly reliable photoelectric switch that detects an object having relatively high transparency.
【0006】[0006]
図2において、発光回路部のクロックパルス部11及び増幅部12によって発 光部13から発光ダイオ−ド等によって赤外線による光線が受光部14へ投光さ れる。受光部14で受光した後、検波回路部15で外乱光をある程度カットする 。ビニ−ルのような透明度の比較的高い被検出体を検出する場合、微量の光を透 過しているため、わずかな光でも検出しなければならないので、増幅器の検出感 度を上げるが、前述のように受光部へ直接入力する外乱光、あるいは内部の増幅 器からの内部雑音から出るノイズを拾いやすくなる。従って増幅器をカスケ−ド 接続にして徐徐にノイズを除去する方法を採用し、しかも検出感度を上げるのに 増幅しやすい交流増幅の形式とした。検波回路部15で受光信号の中の外乱光を 、ある程度カットした後、増幅器16で1段目の交流増幅を行ない、次にフィル タ−バンドパス17で更に外乱光の低域と高域の周波数をカットし、フィルタ− バンドパス17の交流出力を、入力端と出力端にダイオ−ドD1と抵抗R1の並列 回路を設けてあるオペアンプからなる2段目の増幅器18に入力する。受光信号 の中の外乱光によるノイズは半波増幅の形式で、ダイオ−ドD1を短絡して、抵 抗R1によって直流分として前記オペアンプの出力となる。前記直流分は更にコ ンデンサC1によってカットされ、次に比較器19によって、一定電圧を越える 信号を受光信号として受け取り、更に誤動作防止のため積分回路部20を設け、 最終的にノイズを含まない受光信号出力を得ている。 In FIG. 2, a light beam from infrared rays is projected from the light emitting section 13 to the light receiving section 14 by the light emitting diode 13 by the clock pulse section 11 and the amplifying section 12 of the light emitting circuit section. After the light is received by the light receiving unit 14, the detection circuit unit 15 cuts ambient light to some extent. When detecting an object with relatively high transparency, such as vinyl, a small amount of light is transmitted, so even a small amount of light must be detected, which increases the detection sensitivity of the amplifier. As described above, it becomes easy to pick up the ambient light that is directly input to the light receiving unit or the noise generated from the internal noise from the internal amplifier. Therefore, we adopted a method of gradually removing noise by connecting the amplifier in a cascade connection, and adopted an AC amplification method that is easy to amplify to increase the detection sensitivity. After the disturbance light in the received light signal is cut to some extent by the detection circuit unit 15, the first-stage AC amplification is performed by the amplifier 16, and then the filter bandpass 17 further reduces the disturbance light in the low range and the high range. The frequency is cut and the AC output of the filter-bandpass 17 is input to the second stage amplifier 18 consisting of an operational amplifier having a parallel circuit of a diode D1 and a resistor R1 at the input and output ends. The noise due to the ambient light in the received light signal is in the form of half-wave amplification, and the diode D1 is short-circuited, and becomes a DC component by the resistor R1 and becomes the output of the operational amplifier. The DC component is further cut by the capacitor C1, and then the comparator 19 receives a signal exceeding a certain voltage as a light receiving signal. Further, an integrating circuit section 20 is provided to prevent malfunction, and finally the light receiving without noise is provided. You are getting signal output.
【0007】
[0007]
交流増幅を行なうオペアンプからなる2段目の増幅器の入力端と出力端の間に ダイオ−ドと抵抗の並列回路を設けることにより、増幅器の検出感度を上げても 、外乱光によるノイズは前記抵抗を通して半波増幅の形で、直流分は更にコンデ ンサによってカットされることにより誤動作防止が可能となり、透明度の比較的 高い被検出体を検出する信頼性の高い光電スイッチが得られる。 Even if the detection sensitivity of the amplifier is increased by providing a parallel circuit of a diode and a resistor between the input terminal and the output terminal of the second-stage amplifier consisting of an operational amplifier that performs AC amplification, noise due to ambient light causes In the form of half-wave amplification, the DC component is further cut by a capacitor to prevent malfunction, and a highly reliable photoelectric switch for detecting an object with relatively high transparency can be obtained.
以下次のように説明する。 This will be described below.
【図1】従来の光電スイッチブロック図。FIG. 1 is a block diagram of a conventional photoelectric switch.
【図2】本考案の光電スイッチブロック図。FIG. 2 is a block diagram of a photoelectric switch of the present invention.
1 クロックパルス部 2 増幅部 3 発光部 4 受光部 5 増幅部 6 フィルタ−回路部 7 検波回路部 8 比較回路部 9 積分回路部 11 クロックパルス部 12 増幅部 13 発光部 14 受光部 15 検波回路部 16 増幅部 17 フィルタ−バンドパス 18 増幅部 19 比較器 20 積分回路部 1 Clock pulse part 2 Amplifying part 3 Light emitting part 4 Light receiving part 5 Amplifying part 6 Filter-circuit part 7 Detection circuit part 8 Comparison circuit part 9 Integration circuit part 11 Clock pulse part 12 Amplifying part 13 Light emitting part 14 Light receiving part 15 Detection circuit part 16 amplification section 17 filter-bandpass 18 amplification section 19 comparator 20 integration circuit section
Claims (1)
部で生じたパルス波を増幅する増幅部と、該増幅部の出
力信号により生じる発光部と、該発光部の信号を受光す
る受光部と、該受光部の信号を検波する検波回路部と、
該検波回路部の出力を増幅する第1段目の増幅部の出力
の低域と高域の周波数をカットするフィルタ−回路部
と、該フィルタ−回路部で瀘波された受光信号を増幅す
る第2段目の増幅部と、該増幅部の出力を比較する比較
回路部を積分する積分回路部からなる光電スイッチにお
いて、交流増幅を行なう前記第2段目の増幅部を構成す
るオペアンプの入力端と出力端に抵抗とダイオ−ドの並
列回路を設けた光電スイッチ。1. A clock pulse unit, an amplification unit for amplifying a pulse wave generated in the clock pulse unit, a light emitting unit generated by an output signal of the amplification unit, a light receiving unit for receiving a signal of the light emitting unit, A detection circuit unit that detects the signal of the light receiving unit,
A filter-circuit unit that cuts low-frequency and high-frequency frequencies of the output of the first-stage amplifying unit that amplifies the output of the detection circuit unit, and amplifies the received light signal filtered by the filter-circuit unit. In a photoelectric switch including a second-stage amplification section and an integration circuit section that integrates a comparison circuit section that compares the output of the amplification section, an input of an operational amplifier that constitutes the second-stage amplification section that performs AC amplification. A photoelectric switch with a resistor and diode parallel circuit at its output and output.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1993057453U JP2597482Y2 (en) | 1993-09-29 | 1993-09-29 | Photoelectric switch |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1993057453U JP2597482Y2 (en) | 1993-09-29 | 1993-09-29 | Photoelectric switch |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0725625U true JPH0725625U (en) | 1995-05-12 |
JP2597482Y2 JP2597482Y2 (en) | 1999-07-05 |
Family
ID=13056094
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1993057453U Expired - Fee Related JP2597482Y2 (en) | 1993-09-29 | 1993-09-29 | Photoelectric switch |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2597482Y2 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6232618U (en) * | 1985-08-13 | 1987-02-26 | ||
JPH0342609A (en) * | 1989-07-10 | 1991-02-22 | Olympus Optical Co Ltd | Pattern recognizer for camera |
JPH0354905A (en) * | 1989-07-24 | 1991-03-08 | Sumitomo Electric Ind Ltd | Amplifier device |
JPH0387641A (en) * | 1989-08-31 | 1991-04-12 | Toshiba Corp | Signal processing circuit for humidity sensor |
JPH0514096A (en) * | 1991-07-05 | 1993-01-22 | Omron Corp | Light receiving amplifier circuit for photoelectric sensor |
JPH05145393A (en) * | 1991-11-20 | 1993-06-11 | Matsushita Electric Ind Co Ltd | Photoelectric switch |
-
1993
- 1993-09-29 JP JP1993057453U patent/JP2597482Y2/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6232618U (en) * | 1985-08-13 | 1987-02-26 | ||
JPH0342609A (en) * | 1989-07-10 | 1991-02-22 | Olympus Optical Co Ltd | Pattern recognizer for camera |
JPH0354905A (en) * | 1989-07-24 | 1991-03-08 | Sumitomo Electric Ind Ltd | Amplifier device |
JPH0387641A (en) * | 1989-08-31 | 1991-04-12 | Toshiba Corp | Signal processing circuit for humidity sensor |
JPH0514096A (en) * | 1991-07-05 | 1993-01-22 | Omron Corp | Light receiving amplifier circuit for photoelectric sensor |
JPH05145393A (en) * | 1991-11-20 | 1993-06-11 | Matsushita Electric Ind Co Ltd | Photoelectric switch |
Also Published As
Publication number | Publication date |
---|---|
JP2597482Y2 (en) | 1999-07-05 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
LAPS | Cancellation because of no payment of annual fees |