JPH0329514A - Photo interrupter circuit - Google Patents

Photo interrupter circuit

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Publication number
JPH0329514A
JPH0329514A JP16435689A JP16435689A JPH0329514A JP H0329514 A JPH0329514 A JP H0329514A JP 16435689 A JP16435689 A JP 16435689A JP 16435689 A JP16435689 A JP 16435689A JP H0329514 A JPH0329514 A JP H0329514A
Authority
JP
Japan
Prior art keywords
current
light
light emitting
emitting diode
photo
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
Application number
JP16435689A
Other languages
Japanese (ja)
Inventor
Yoichi Hori
洋一 堀
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rohm Co Ltd
Original Assignee
Rohm Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Rohm Co Ltd filed Critical Rohm Co Ltd
Priority to JP16435689A priority Critical patent/JPH0329514A/en
Publication of JPH0329514A publication Critical patent/JPH0329514A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To reduce power consumption by supplying an output current of a light receiving element receiving the light from a light emitting element stimulated by a current, and causing a current to the light emitting element. CONSTITUTION:A current I1 flowing from a 1st line 1 to a light emitting diode 5 through a resistor R1 is a minute current by which the light emitting diode 5 lights slightly. When a light shield object (slit) exist in a notch 7, since a photo transistor(TR) 3 is turned off, a current flowing from the photo TR 3 to the light emitting diode 5 is zero and an output current I0 is equal to the current I1. When no slit exists in the path, since the light from the light emitting diode 5 is received by a photo TR 6, the photo TR 6 is turned on and its emitter current is supplied from a point (a) to the light emitting diode 5. Thus, the stimulated light quantity of the light emitting diode 5 is increased, the emitter current of the photo TR 6 is also increased and the output current I0 is sufficiently increased. Thus, power consumption is saved.

Description

【発明の詳細な説明】 皮呈≧旦剋且発艷 本発明はフォトインターラプタ回路に関するものである
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a photointerrupter circuit.

僅1四lえ販 従来のフォトインターラプタ回路は第6図に示すように
電源ライン(20)と接地ライン(21)間にフォトイ
ンターラプタ(22)の発光ダイオード(23)と抵抗
(24)を接続し、一方、フォトインターラプタ(22
)を構戒するフォトトランジスタ(25)のコレクタを
電源ライン(20)に、エミッタを出力信号ライン(2
9)に接続している。出力信号ライン(29)は電流検
出回路(26)に接続されている.発光ダイオード(2
3)とフォトトランジスタ(25)は戒型樹脂(27)
によって一体化されており、その樹脂(27)には発光
ダイオード(23)から出た光がフォトトランジスタ(
25)に受光されるように切欠き(28)が形或されて
いる.発光ダイオード(23)は常時ONとなっていて
発光しているが、切欠き(28)に物体が介在したとき
には、発光ダイオード(23)から発射された光がこの
物体により遮ら切られてフォトトランジスタ(25)に
到達しないため出力信号ライン〈29)には電流が現わ
れない. しよ゛と る 上記従来のフォトトランジスタでは、電源ライン(20
) ,接地ライン(21),出力信号ライン(29)の
3本の配線が必要となるため、フォトインターラプタ(
3)の使用個数が多くなればなる程、配線コストが高く
つくという欠点がある。また、発光ダイオード(23)
には常に充分な光を発光させるため多くの電流が流れる
ようになっているため消費電力が大きくなる。
As shown in Figure 6, the conventional photointerrupter circuit connects the light emitting diode (23) of the photointerrupter (22) and the resistor (24) between the power line (20) and the ground line (21). On the other hand, connect the photo interrupter (22
), the collector of the phototransistor (25) is connected to the power supply line (20), and the emitter is connected to the output signal line (20).
9). The output signal line (29) is connected to a current detection circuit (26). Light emitting diode (2
3) and phototransistor (25) are made of Kai type resin (27)
The light emitted from the light emitting diode (23) is integrated into the resin (27) by the phototransistor (
A notch (28) is formed so that the light is received by (25). The light emitting diode (23) is always ON and emits light, but when an object is present in the notch (28), the light emitted from the light emitting diode (23) is blocked by the object and the phototransistor is cut off. Since the current does not reach (25), no current appears in the output signal line (29). In the above-mentioned conventional phototransistor, the power supply line (20
), the ground line (21), and the output signal line (29), so the photointerrupter (
The disadvantage of 3) is that the wiring cost increases as the number of devices used increases. Also, light emitting diode (23)
In order to emit sufficient light at all times, a large amount of current flows through the device, resulting in high power consumption.

本発明はこのような点に鑑みなされたものであって、配
線数が少なく且つ消費電力が少なくて済むように工夫し
た新規なフォトインターラプタ回路を提供することを目
的とする。
The present invention has been made in view of these points, and it is an object of the present invention to provide a novel photointerrupter circuit that is devised to require less wiring and less power consumption.

課題を解゜するための手 上記の目的を達或するため本発明のフォトインターラプ
タ回路は、電流によって発光する発光素子からの光を受
光して電流を出力する受光素子の出力電流を前記発光素
子に供給するように接続した構戒となっている. 立一貝 このような構戒によると、受光素子がONLない状態で
は発光素子には該発光素子が僅かに発光する程度の電流
を与えておくだけでよい。この僅かな光が途中で遮え切
られることなく受光素子に到達すると、受光素子から電
流が生じるが、この電流は受光素子に与えられるため発
光素子の発光量は多くなり、充分な発光となる。このた
め、受光素子の電流も多くなり、結果として発光素子は
充分大きな電流で駆動される。
Means for Solving the Problems In order to achieve the above object, the photointerrupter circuit of the present invention converts the output current of a light receiving element that receives light from a light emitting element that emits light by an electric current and outputs a current into the light emitting element. It is connected to supply the element. According to this policy, when the light-receiving element is not ONL, it is sufficient to apply a current to the light-emitting element such that the light-emitting element slightly emits light. When this small amount of light reaches the light-receiving element without being interrupted on the way, a current is generated from the light-receiving element, but since this current is given to the light-receiving element, the amount of light emitted by the light-emitting element increases, resulting in sufficient light emission. . Therefore, the current of the light-receiving element also increases, and as a result, the light-emitting element is driven with a sufficiently large current.

太1L班 以下、図面に示す本発明の実施例について説明する.第
1図において、(1)は電源電圧が印加される第1線路
であり、〈2〉 は第2線路である.威型樹脂(4)に
より発光ダイオード(5)とフォトトランジスタ(6)
を一体にしたフォトインターラプタ(3)は切欠き(7
)を有している。発光ダイオード(5)のアノードは抵
抗(R+)を介して第1線路(1)に接続され、カソー
ドは第2線路(2)に接続されている.一方、フォトト
ランジスタ(6)のコレクタは抵抗(R2)を介して第
l線路(1)に接続され、エミッタは抵抗(Rl)と発
光ダイオード(5)の接続点(a)に接続されている.
ここでは、フォトトランジスタ(6)のエミッタと発光
ダイオード(5)のアノードを樹脂(4)の外で接続し
ているが、フォトインターラプタ(3)を樹脂成型する
前に、その接続をしておけば便利である。
The embodiments of the present invention shown in the drawings will be described below. In Fig. 1, (1) is the first line to which the power supply voltage is applied, and <2> is the second line. Light emitting diode (5) and phototransistor (6) made of molded resin (4)
The integrated photo interrupter (3) has a notch (7
)have. The anode of the light emitting diode (5) is connected to the first line (1) via a resistor (R+), and the cathode is connected to the second line (2). On the other hand, the collector of the phototransistor (6) is connected to the lth line (1) via the resistor (R2), and the emitter is connected to the connection point (a) between the resistor (Rl) and the light emitting diode (5). ..
Here, the emitter of the phototransistor (6) and the anode of the light emitting diode (5) are connected outside the resin (4), but this connection must be made before molding the photointerrupter (3) with the resin. It is convenient to have it.

第1図において、第1線路(1)から抵抗(R,)を通
して発光ダイオード(5)に流れる電流(II)は発光
ダイオード(5)が僅かに光る程度の微少電流でよい。
In FIG. 1, the current (II) flowing from the first line (1) through the resistor (R,) to the light emitting diode (5) may be so small as to cause the light emitting diode (5) to glow slightly.

切欠き(7)に光遮断物体(以下「スリット」という)
が存するときは、フォトトランジスタ(3)はOFF状
態であるため、フォトトランジスタ(3)から発光ダイ
オード(5)に流れる電流はOであり、従って出力電流
(re)は(ry)に等しい。
A light blocking object (hereinafter referred to as "slit") is placed in the notch (7)
exists, the phototransistor (3) is in the OFF state, so the current flowing from the phototransistor (3) to the light emitting diode (5) is O, and therefore the output current (re) is equal to (ry).

次に、スリットが無くなると、発光ダイオード(5)か
らの光がフォトトランジスタ(6〉によって受光される
ためフォトトランジスタ(6)がONE,、そのエミッ
タ電流は(a)点から発光ダイオード(5)に与えられ
る。このため、発光ダイオード(5)の発光量は多くな
り、フォトトランジスタ(6)のエミッタ電流も大きく
なる。そのため、出力電流(I。)も充分大きくなる。
Next, when the slit disappears, the light from the light emitting diode (5) is received by the phototransistor (6>), so the phototransistor (6) becomes ONE, and its emitter current flows from point (a) to the light emitting diode (5). Therefore, the amount of light emitted by the light emitting diode (5) increases, and the emitter current of the phototransistor (6) also increases.Therefore, the output current (I.) also becomes sufficiently large.

次に、またスリットが切欠き(7)に介在すると、元の
状態に戻り第2線路(2)の出力電流(■。)は僅かと
なる。第2図は前記各電流の関係を示している。第3図
は第1図の実施例に更にインジケータ用の発光ダイオー
ド(8)を設けた例を示している.第4図と第5図はそ
れぞれ第1図のフォトインターラプタ回路の出力信号を
処理・利用する回路の具体例を示しており、出力電流(
I0)を抵抗(R,)で電圧に変換した後、コンバレー
タ(9)に印加して別途抵抗器(10)で設定された基
準電圧(v1.)と比較するようにしている.ここで、
(11)は負荷であり、この負荷(11)はフォトイン
ターラプタ(3)のフォトトランジスタ(6)がONL
たとき、第4図ではコンパレータ(9)の出力がハイレ
ベルになるためOFFとなり、第5図ではコンパレータ
(9)の出力がローレベルになるためONとなる.尚、
第5rf!Jはフォトインターラプタ(3)の出力電流
(I o)を第1線路(1)から取っている。
Next, when a slit is inserted into the notch (7) again, the state returns to the original state and the output current (■.) of the second line (2) becomes small. FIG. 2 shows the relationship between the respective currents. Figure 3 shows an example in which a light emitting diode (8) for an indicator is further added to the embodiment shown in Figure 1. Figures 4 and 5 respectively show specific examples of circuits that process and utilize the output signals of the photointerrupter circuit in Figure 1, and the output current (
After converting I0) into a voltage using a resistor (R, ), it is applied to a converter (9) and compared with a reference voltage (v1.) set using a separate resistor (10). here,
(11) is a load, and this load (11) is the ONL of the phototransistor (6) of the photointerrupter (3).
At this time, the output of the comparator (9) becomes high level in FIG. 4, so it is turned OFF, and in FIG. 5, the output of the comparator (9) becomes low level, so it is turned ON. still,
5th rf! J takes the output current (I o) of the photointerrupter (3) from the first line (1).

且里坐募果 以上説明したように、本発明によれば受光素子から出力
された電流を発光素子に供給するようにしているので、
受光素子がOFFのとき発光素子に流れる電流は僅かで
よく、その分、消費電力が少なくて済む.また、フォト
インターラプタの出力電流は該フォトインターラプタを
接続する2つの線路のいずれか一方を利用して取ること
ができるので、配線数が従来の2/3で済むという効果
もあり、本発明は極めて有用である。
As explained above, according to the present invention, the current output from the light receiving element is supplied to the light emitting element.
When the light-receiving element is off, only a small amount of current flows through the light-emitting element, resulting in less power consumption. Furthermore, since the output current of the photointerrupter can be taken using either one of the two lines connecting the photointerrupter, the number of wires can be reduced to two-thirds of the conventional one. is extremely useful.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明を実施したフォトインターラプタ回路の
回路図であり、第2図はその各部の電流波形図である。 第3図は本発明の他の従来例の回路図である。第4図及
び第5図は第1図の回路の適用例を示す回路図である。 第6図は従来例の回路図である。 (3)一・・フォトインターラプタ, (4) 一樹脂,(5)一・一発光ダイオード,(6)
 一 フォトトランジスタ,(7)・−・切欠き。
FIG. 1 is a circuit diagram of a photointerrupter circuit embodying the present invention, and FIG. 2 is a current waveform diagram of each part thereof. FIG. 3 is a circuit diagram of another conventional example of the present invention. 4 and 5 are circuit diagrams showing an example of application of the circuit of FIG. 1. FIG. 6 is a circuit diagram of a conventional example. (3) One photointerrupter, (4) One resin, (5) One and one light emitting diode, (6)
1 Phototransistor, (7) -- Notch.

Claims (1)

【特許請求の範囲】[Claims] (1)電流によって発光する発光素子からの光を受光し
て電流を出力する受光素子の出力電流を前記発光素子に
供給するように接続したフォトインターラプタ回路。
(1) A photointerrupter circuit connected to supply the output current of a light-receiving element that receives light from a light-emitting element that emits light with an electric current and outputs a current to the light-emitting element.
JP16435689A 1989-06-27 1989-06-27 Photo interrupter circuit Pending JPH0329514A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16435689A JPH0329514A (en) 1989-06-27 1989-06-27 Photo interrupter circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16435689A JPH0329514A (en) 1989-06-27 1989-06-27 Photo interrupter circuit

Publications (1)

Publication Number Publication Date
JPH0329514A true JPH0329514A (en) 1991-02-07

Family

ID=15791596

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16435689A Pending JPH0329514A (en) 1989-06-27 1989-06-27 Photo interrupter circuit

Country Status (1)

Country Link
JP (1) JPH0329514A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6330840A (en) * 1986-07-24 1988-02-09 Konica Corp Silver halide photographic sensitive material

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6330840A (en) * 1986-07-24 1988-02-09 Konica Corp Silver halide photographic sensitive material

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