JPH0351981Y2 - - Google Patents
Info
- Publication number
- JPH0351981Y2 JPH0351981Y2 JP501385U JP501385U JPH0351981Y2 JP H0351981 Y2 JPH0351981 Y2 JP H0351981Y2 JP 501385 U JP501385 U JP 501385U JP 501385 U JP501385 U JP 501385U JP H0351981 Y2 JPH0351981 Y2 JP H0351981Y2
- Authority
- JP
- Japan
- Prior art keywords
- light
- emitting element
- receiving circuit
- light emitting
- passage
- 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.)
- Expired
Links
- 230000000903 blocking effect Effects 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 2
- 244000145845 chattering Species 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
Landscapes
- Electronic Switches (AREA)
Description
【考案の詳細な説明】
〈産業上の利用分野〉
本考案は発光素子と受光回路とが組み合わされ
てなるホトインタラプタに関する。[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a photointerrupter that is a combination of a light emitting element and a light receiving circuit.
〈考案の概要〉
本考案はホトインタラプタを安定して駆動する
ために受光回路の出力が反転する前後において発
光素子の駆動電流を不連続に変化せしめたもので
ある。<Summary of the invention> In order to drive the photointerrupter stably, the invention discontinuously changes the drive current of the light emitting element before and after the output of the light receiving circuit is reversed.
〈従来の技術〉
従来のホトインタラプタの回路構成を第３図に
示す。１は発光素子、２は発光素子１の光を受け
る受光素子を含んだ受光回路である。３は保護用
の抵抗である。このようなホトインタラプタを第
４図のように組み立てる。第４図ａは正面図、第
４図ｂは側面図である。４はホトインタラプタで
あり、該ホトインタラプタ４内部に配置された発
光素子１と受光回路２の間に遮光板５の通過路６
が設けられている。<Prior Art> The circuit configuration of a conventional photointerrupter is shown in FIG. 1 is a light emitting element, and 2 is a light receiving circuit including a light receiving element that receives light from the light emitting element 1. 3 is a protection resistor. Such a photointerrupter is assembled as shown in FIG. FIG. 4a is a front view, and FIG. 4b is a side view. 4 is a photointerrupter, and a passage 6 of a light shielding plate 5 is provided between the light emitting element 1 and the light receiving circuit 2 disposed inside the photointerrupter 4.
is provided.
この遮光板５の移動に応じた受光回路２の受光
量と出力を第５図に示す。第５図でa1は遮光板５
が徐々に光を遮つている状態、a2は完全に光を遮
つている状態、a3は遮光板５が徐々に光を通過せ
しめる状態、a4は遮光板５が全く光を遮らない状
態を示す。受光回路２の出力は同図に示すごと
く、ON（Ｌ→Ｈ）時及びOFF（Ｈ→Ｌ）時におい
てヒステリシス性がない。 FIG. 5 shows the amount of light received by the light receiving circuit 2 and the output according to the movement of the light shielding plate 5. In Figure 5, a 1 is the light shielding plate 5
A 2 is a state where the light is gradually blocked, a 2 is a state where the light is completely blocked, a 3 is a state where the light shielding plate 5 gradually allows light to pass through, and a 4 is a state where the light shielding plate 5 is not blocking light at all. shows. As shown in the figure, the output of the light receiving circuit 2 has no hysteresis when ON (L→H) and OFF (H→L).
〈考案が解決しようとする課題〉
以上のようにヒステリシス性を持たせていなか
つたので、受光量がスレツシユ光量付近で変動し
た場合、出力においてチヤツタリングが発生する
ことがあり、不都合であつた。これを解決するた
め、ヒステリシス回路を内蔵した受光回路が知ら
れている。例えば、CQ出版株式会社、昭和59年
10月30日発行、現場技術者実戦シリーズ３「オプ
ト・デバイス応用ノウハウ」、P.P117〜118。<Problems to be Solved by the Invention> As described above, since hysteresis was not provided, when the amount of received light fluctuated around the threshold light amount, chattering could occur in the output, which was inconvenient. To solve this problem, a light receiving circuit with a built-in hysteresis circuit is known. For example, CQ Publishing Co., Ltd., 1982
Published October 30th, Field Engineer Practical Series 3 "Optodevice Application Know-how", P.P117-118.
本考案は、このようなヒステリシス回路を内蔵
した受光回路を用いて、さらにヒステリシス特性
を増長させ安定した動作が達成できるホトインタ
ラプタを提供することを提供することを目的とす
る。 It is an object of the present invention to provide a photointerrupter that can achieve stable operation by further enhancing hysteresis characteristics by using a light receiving circuit incorporating such a hysteresis circuit.
〈課題を解決するための手段〉
物体の通過路が設けられ、前記通過路を移動す
る物体を光学的に検出するホトインタラプタにお
いて、
前記通過路に光を放射する発光素子と、
前記発光素子の光を前記通過路を介して受光す
るヒステリシス回路を内蔵した受光回路と、
２つの電源端子間において前記発光素子と直列
接続される複数の分圧抵抗とを備え、
前記受光回路は、消費電流が通光動作時より遮
光動作時の方が小さくなるよう構成され、前記発
光素子と直列関係、前記分圧抵抗の１つと並列関
係に接続して、前記受光回路の通光動作時と遮光
動作時で異なる消費電流により、前記受光回路の
遮光動作時に前記発光素子に流れる電流を減ら
し、通光動作時に前記発光素子に流れる電流を増
し、前記受光回路のヒステリシス特性を増長させ
てなることを特徴とする。<Means for Solving the Problems> A photointerrupter that is provided with a passage for an object and optically detects an object moving along the passage, comprising: a light emitting element that emits light to the passage; The light receiving circuit includes a built-in hysteresis circuit that receives light through the passage path, and a plurality of voltage dividing resistors connected in series with the light emitting element between two power supply terminals, and the light receiving circuit has a current consumption of It is configured to be smaller during light-blocking operation than during light-passing operation, and is connected in series with the light emitting element and in parallel with one of the voltage dividing resistors, so that the light-receiving circuit is smaller during light-passing operation and during light-blocking operation. According to different current consumptions, the current flowing through the light emitting element during the light blocking operation of the light receiving circuit is reduced, the current flowing through the light emitting element during the light transmitting operation is increased, and the hysteresis characteristic of the light receiving circuit is increased. do.
〈実施例〉
第１図に本考案に係るホトインタラプタの一実
施例の回路構成を示す。<Embodiment> FIG. 1 shows a circuit configuration of an embodiment of a photointerrupter according to the present invention.
電源VccとアースGND間に直列に発光素子１、
分圧抵抗７及び８が接続され、抵抗８に並列にヒ
ステリシス回路を内蔵した受光回路２を接続して
いる。なお、受光回路２は、その消費電流が通光
動作時より遮光動作時の方が小さくなるように構
成されたものである。 Light emitting element 1 is connected in series between power supply Vcc and earth GND.
Voltage dividing resistors 7 and 8 are connected, and a light receiving circuit 2 having a built-in hysteresis circuit is connected in parallel to the resistor 8. Note that the light receiving circuit 2 is configured such that its current consumption is smaller during the light blocking operation than during the light passing operation.
このホトインタラプタを第４図のように組み立
てる。ホトインタラプタ４内部に配置された発光
素子１と受光回路２の間に設けられた遮光板５の
通過路６を、遮光板５が移動する時、受光回路２
の受光量と出力は第２図のようになる。同図でa1
は遮光板５が徐々に光を遮つている状態、a2は完
全に光を遮つている状態、a3は遮光板５が徐々に
光を通過せしめる状態、a4は遮光板５が全く光を
遮らない状態を示す。 This photointerrupter is assembled as shown in FIG. When the light shielding plate 5 moves through the passage path 6 of the light shielding plate 5 provided between the light emitting element 1 and the light receiving circuit 2 arranged inside the photointerrupter 4, the light receiving circuit 2
The amount of light received and the output are shown in Figure 2. In the same figure, a 1
A is a state in which the light shielding plate 5 gradually blocks light, a2 is a state in which the light is completely blocked, a3 is a state in which the light shielding plate 5 is gradually allowing light to pass through, and a4 is a state in which the light shielding plate 5 is completely blocking light. Indicates a state in which the image is not obstructed.
受光回路２の出力は第２図に示すごとくであ
り、遮光によりON（状態a1→a2）となる時、受
光回路２の消費電流は通光動作時より小さくなる
ため、ON時点で発光素子１に流れる駆動電流は
減少し、発光素子１の光量は不連続に減少する。
したがつて、一旦ON状態に移れば、多少の発光
素子１の発光光量に変動があつてもON状態を安
定的に保持する。通光によるOFF（状態a3→a4）
時においても同様であり、受光回路２はその消費
電流が通光動作時において多くなるので、OFF
時点で発光素子１の駆動電流は増加し、発光素子
１の光量を不連続に増加する。したがつて、一旦
OFF状態に移れば、多少の発光素子１の発光光
量に変動があつてもOFF状態を安定的に保持す
る。 The output of the light receiving circuit 2 is as shown in Fig. 2. When the light is turned ON due to light shielding (state a 1 → a 2 ), the current consumption of the light receiving circuit 2 is smaller than that during light passing operation, so light is not emitted at the time of ON. The drive current flowing through the element 1 decreases, and the amount of light from the light emitting element 1 decreases discontinuously.
Therefore, once the light emitting element 1 is turned on, the ON state is stably maintained even if the amount of light emitted by the light emitting element 1 fluctuates to some extent. OFF due to light passing (state a 3 → a 4 )
The same is true when the light receiving circuit 2 is turned off, as its current consumption increases during light passing operation.
At this point, the driving current of the light emitting element 1 increases, and the amount of light of the light emitting element 1 increases discontinuously. Therefore, once
Once the light emitting element 1 shifts to the OFF state, the OFF state is stably maintained even if the amount of light emitted by the light emitting element 1 fluctuates to some extent.
このようにして、ヒステリシス回路を内蔵した
受光回路２のヒステリシス特性がさらに増長さ
れ、より安定駆動動作が達成できる。 In this way, the hysteresis characteristic of the light receiving circuit 2 having a built-in hysteresis circuit is further enhanced, and more stable driving operation can be achieved.
なお、分圧抵抗７及び８は、その値を適当に選
定して受光回路２の定格電圧よりホトインタラプ
タの定格電圧を上げることができ、さらに発光素
子１を含めホトインタラプタをひとつの電源Vcc
で構成できる利点もあるものである。 Note that by appropriately selecting the values of the voltage dividing resistors 7 and 8, the rated voltage of the photointerrupter can be raised higher than the rated voltage of the light receiving circuit 2, and furthermore, the photointerrupter including the light emitting element 1 can be connected to a single power supply Vcc.
It also has the advantage that it can be configured with
〈考案の効果〉
以上のように本考案によれば、比較的簡便な回
路構成により、受光回路に内蔵したヒステリシス
回路のヒステリシス特性を増長して、より安定し
た駆動動作が達成できるとともに、ホトインタラ
プタとしての定格電圧等の選択も容易な有用なホ
トインタラプタが提供できる。<Effects of the invention> As described above, according to the invention, the hysteresis characteristics of the hysteresis circuit built into the photodetector circuit can be increased by using a relatively simple circuit configuration, and more stable drive operation can be achieved. It is possible to provide a useful photointerrupter whose rated voltage, etc., can be easily selected.
第１図は本考案のホトインタラプタの一実施例
を示す回路構成図、第２図は同波形図、第３図は
従来例のホトインタラプタを示す回路構成図、第
４図ａはホトイタラプタの組み立て状態を示す正
面図、第４図ｂはその側面図、第５図は従来例に
おける波形図である。
１：発光素子、２：受光回路、７，８：分圧抵
抗、６：通過路、Vcc：電源、GND：アース。
Figure 1 is a circuit configuration diagram showing an embodiment of the photointerrupter of the present invention, Figure 2 is a waveform diagram of the same, Figure 3 is a circuit configuration diagram showing a conventional photointerrupter, and Figure 4a is the assembly of the photointerrupter. FIG. 4B is a front view showing the state, FIG. 4B is a side view thereof, and FIG. 5 is a waveform diagram in a conventional example. 1: Light emitting element, 2: Light receiving circuit, 7, 8: Voltage dividing resistor, 6: Passing path, Vcc: Power supply, GND: Earth.
Claims (1)
る物体を光学的に検出するホトインタラプタにお
いて、 前記通過路に光を放射する発光素子と、 前記発光素子の光を前記通過路を介して受光す
るヒステリシス回路を内蔵した受光回路と、 ２つの電源端子間において前記発光素子と直列
接続される複数の分圧抵抗とを備え、 前記受光回路は、消費電流が通光動作時より遮
光動作時の方が小さくなるよう構成され、前記発
光素子と直列関係、前記分圧抵抗の１つと並列関
係に接続して、前記受光回路の通光動作時と遮光
動作時で異なる消費電流により、前記受光回路の
遮光動作時に前記発光素子に流れる電流を減ら
し、通光動作時に前記発光素子に流れる電流を増
し、前記受光回路のヒステリシス特性を増長させ
てなることを特徴とするホトインタラプタ。[Claims for Utility Model Registration] A photointerrupter that is provided with a passage for an object and optically detects an object moving along the passage, comprising: a light emitting element that emits light to the passage; and a light emitting element that emits light to the passage. The light receiving circuit includes a built-in hysteresis circuit for receiving light through the passage path, and a plurality of voltage dividing resistors connected in series with the light emitting element between two power supply terminals, It is configured to be smaller during light-blocking operation than during light-blocking operation, and is connected in series with the light-emitting element and in parallel with one of the voltage dividing resistors, so that the light-receiving circuit is smaller during light-transmitting operation and light-blocking operation. The different current consumption reduces the current flowing through the light emitting element during the light blocking operation of the light receiving circuit, increases the current flowing through the light emitting element during the light transmitting operation, and increases the hysteresis characteristic of the light receiving circuit. Photo interrupter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP501385U JPH0351981Y2 (en) | 1985-01-17 | 1985-01-17 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP501385U JPH0351981Y2 (en) | 1985-01-17 | 1985-01-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61121765U JPS61121765U (en) | 1986-07-31 |
| JPH0351981Y2 true JPH0351981Y2 (en) | 1991-11-08 |
Family
ID=30481138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP501385U Expired JPH0351981Y2 (en) | 1985-01-17 | 1985-01-17 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0351981Y2 (en) |
-
1985
- 1985-01-17 JP JP501385U patent/JPH0351981Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61121765U (en) | 1986-07-31 |
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