JPS6326403B2 - - Google Patents
Info
- Publication number
- JPS6326403B2 JPS6326403B2 JP52158477A JP15847777A JPS6326403B2 JP S6326403 B2 JPS6326403 B2 JP S6326403B2 JP 52158477 A JP52158477 A JP 52158477A JP 15847777 A JP15847777 A JP 15847777A JP S6326403 B2 JPS6326403 B2 JP S6326403B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- output
- receiving element
- transistor
- circuit
- 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
- 238000001514 detection method Methods 0.000 claims description 10
- 230000003321 amplification Effects 0.000 claims description 7
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 3
- 101000802478 Sylvirana guentheri Brevinin-2GHa Proteins 0.000 description 1
- 101000802471 Sylvirana guentheri Brevinin-2GHb Proteins 0.000 description 1
- 101000906575 Sylvirana guentheri Guentherin Proteins 0.000 description 1
- 101000851879 Sylvirana guentheri Temporin-GH Proteins 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- HODRFAVLXIFVTR-RKDXNWHRSA-N tevenel Chemical compound NS(=O)(=O)C1=CC=C([C@@H](O)[C@@H](CO)NC(=O)C(Cl)Cl)C=C1 HODRFAVLXIFVTR-RKDXNWHRSA-N 0.000 description 1
Landscapes
- Light Receiving Elements (AREA)
- Control Of Position Or Direction (AREA)
Description
【発明の詳細な説明】
本発明はフオトセンサ回路に関し、詳しくはフ
オトセンサ回路の温度変動に対する安定性を高め
る技術に関するもので、例えば、サーボ制御をお
こなう位置決め装置等において位置信号検出器と
して使用されるフオトセンサに好適なものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a photo sensor circuit, and more particularly to a technique for increasing the stability of a photo sensor circuit against temperature fluctuations. It is suitable for
一般に、フオトセンサは発光ダイオードと受光
ダイオードとの組合せよりなるが、発光ダイオー
ドの電流を一定とし、周囲温度を変化させて受光
ダイオードの出力を測定した場合、50℃の温度変
化に対して約40％前後変動する。ところで、サー
ボ制御の位置決め装置等では、この種のフオトセ
ンサにより90゜位相の異なる２相の位置信号を検
出し、更に、これらを反転して４相の信号を得、
それぞれ微分して速度電圧として使用しているた
め、受光ダイオードの出力変動は速度誤差となつ
て現われる。 Generally, a photo sensor consists of a combination of a light-emitting diode and a light-receiving diode, but when the current of the light-emitting diode is kept constant and the output of the light-receiving diode is measured while changing the ambient temperature, the output of the light-receiving diode is approximately 40% for a temperature change of 50°C. It fluctuates back and forth. By the way, in servo-controlled positioning devices, etc., this type of photo sensor detects two-phase position signals with a 90° phase difference, and then inverts these signals to obtain four-phase signals.
Since each voltage is differentiated and used as a speed voltage, fluctuations in the output of the light receiving diode appear as speed errors.
本出願人は先に、上記周囲の温度変動や、発光
ダイオード、受光ダイオードの劣化等に対してセ
ンサの出力を安定化する回路を提案したが（特願
昭51―76854号参照）、本発明はその改良に係るも
ので、フオトセンサ回路の信頼性を更に向上させ
ることを目的としている。 The present applicant had previously proposed a circuit that stabilizes the sensor output against the above-mentioned ambient temperature fluctuations and deterioration of the light-emitting diode and light-receiving diode (see Japanese Patent Application No. 76854-1989), but the present invention This is an improvement on the photo sensor circuit, and its purpose is to further improve the reliability of the photo sensor circuit.
以下、図面にもとづいて本発明の一実施例につ
いて詳述する。 Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.
第１図は本発明で使用するフオトセンサ部の一
実施例である。第１図ａにおいて、１は光源の発
光ダイオードであり、該発光ダイオードと対向し
て３個の受光ダイオード２―１，２―２，１２―
３よりなるフオトダイオードアレイ２が配置され
ている。フオトダイオードアレイ２は単一素子の
組合せ又はモノリシツクタイプ等で形成され、そ
の３つの素子２―１，２―２，２―３は電気的に
非常に近い特性を有している。発光ダイオード１
とフオトダイオードアレイ２の間にはミラー３と
マスク４が配置され、これらのうち、発光ダイオ
ード１、フオトダイオードアレイ２、マスク４は
固定され、ミラー３がサーボモータ（図示せず）
の回転に追従して回転する。第１図ｂに示すよう
に、ミラー３はテイスク形状を有しており、その
円周上にはエツチングによつて光学的スリツトが
設けられ、等間隔な光通過部３―１と光遮断部３
―２とからなつている。又、マスクは第１図ｃに
示すように、ミラー３のスリツト間隔に一致する
Ａスリツト４―１、Ｂスリツト４―２、及び常に
光を通すＣスリツト４―３から成つており、Ａス
リツト４―１とＢスリツト４―２は90゜位相がず
れている。フオトダイオードアレイ２上の受光素
子２―１はＡスリツト４―１を通過する光を受光
し、同様に、受光素子２―２はＢスリツト４―２
を通過する光を、受光素子（補償用受光素子）２
―３はＣスリツト４―３を通過する光をそれぞれ
受光することになる。第２図ａはミラー３を第１
図の矢印に回転させた場合の受光素子２―１，２
―２，２―３の出力を示し、第２図ｂは受光素子
２―１，２―２の出力の交流分を取出した位置信
号Ａ，Ｂの波形である。本発明は、補償用受光素
子２―３の出力を温度及び経時変化等に対して安
定化することにより、位置信号検出用受光素子２
―１，２―２の出力を温度及び経時変化時に対し
て安定化することにある。 FIG. 1 shows an embodiment of the photo sensor section used in the present invention. In FIG. 1a, 1 is a light emitting diode as a light source, and facing the light emitting diode are three light receiving diodes 2-1, 2-2, 12-.
A photodiode array 2 consisting of 3 is arranged. The photodiode array 2 is formed of a combination of single elements or a monolithic type, and the three elements 2-1, 2-2, and 2-3 have very similar electrical characteristics. light emitting diode 1
A mirror 3 and a mask 4 are arranged between the photodiode array 2 and the light emitting diode 1, the photodiode array 2, and the mask 4 are fixed, and the mirror 3 is connected to a servo motor (not shown).
Rotates following the rotation of. As shown in FIG. 1b, the mirror 3 has a take shape, and optical slits are provided on its circumference by etching, and light passing portions 3-1 and light blocking portions are equally spaced. 3
- It consists of 2. Further, as shown in Fig. 1c, the mask consists of an A slit 4-1, a B slit 4-2, which corresponds to the slit spacing of the mirror 3, and a C slit 4-3, which always allows light to pass through. 4-1 and B slit 4-2 are out of phase by 90 degrees. The light receiving element 2-1 on the photodiode array 2 receives the light passing through the A slit 4-1, and similarly, the light receiving element 2-2 receives the light passing through the B slit 4-2.
The light passing through the light receiving element (compensation light receiving element) 2
-3 respectively receive the light passing through the C slit 4-3. Figure 2 a shows mirror 3 in the first position.
Light receiving elements 2-1, 2 when rotated in the direction of the arrow in the figure
2 and 2-3, and FIG. 2b shows the waveforms of the position signals A and B obtained by extracting the alternating current components of the outputs of the light receiving elements 2-1 and 2-2. The present invention stabilizes the output of the compensation light-receiving element 2-3 against temperature and changes over time.
The objective is to stabilize the output of -1 and 2-2 against changes in temperature and over time.
第３図は本発明の前提となる先に提案した安定
化技術を説明するためのブロツク図である。第３
図は大別して、受光素子２―３の出力を温度、経
時変化、電圧変動に対して安定化ならしめるため
のフイードバツク補償回路１０と受光素子２―
１，２―２の出力検出回路２０，３０とから構成
される。フイードバツク補償回路１０には、補償
用受光素子２―３の出力を増幅する反転増幅回路
１１，発光ダイオード１を駆動する電流増幅回路
１２、受光素子２―３の出力値と発光ダイオード
１の電流値を決める定電圧回路１３、これらの電
流・温度ドリフトを補償するドリフト補償回路１
４、更に、サーボ制御の指令信号源となる直流電
圧を出力する基準電圧回路１５等が含まれる。受
光素子２―１に対する検出回路２０は２段の反転
増幅回路２１，２２より成立つており、後段の反
転増幅回路２２ではバイアス設定も行われる。受
光素子２―２に対する検出回路３０についても同
様である。 FIG. 3 is a block diagram for explaining the previously proposed stabilization technology that is the premise of the present invention. Third
The figure is roughly divided into a feedback compensation circuit 10 for stabilizing the output of the light receiving element 2-3 against temperature, changes over time, and voltage fluctuations, and the light receiving element 2-3.
1 and 2-2 output detection circuits 20 and 30. The feedback compensation circuit 10 includes an inverting amplifier circuit 11 that amplifies the output of the compensation light receiving element 2-3, a current amplifying circuit 12 that drives the light emitting diode 1, and an output value of the light receiving element 2-3 and a current value of the light emitting diode 1. a constant voltage circuit 13 that determines the current, and a drift compensation circuit 1 that compensates for these current and temperature drifts.
4. Furthermore, a reference voltage circuit 15 and the like that outputs a DC voltage serving as a command signal source for servo control is included. The detection circuit 20 for the light receiving element 2-1 is made up of two stages of inverting amplifier circuits 21 and 22, and the bias setting is also performed in the inverting amplifier circuit 22 at the subsequent stage. The same applies to the detection circuit 30 for the light receiving element 2-2.
第３図において、フイードバツク補償回路１０
は常に発光ダイオード１の光を受光する補償用受
光素子２―３の出力を反転増幅回路１１を通して
電流増幅回路１２にフイードバツクし、これを定
電圧回路１３の出力と比較し、温度、電圧変動等
により受光素子２―３の出力が減少すると発光ダ
イオード１の電流を増加させ、逆に受光素子２―
３の出力が増加すると発光ダイオード１の電流を
減少させ、更に、電流増幅回路１２のドリフトを
ドリフト補償回路１４により補償する働きをして
いる。このため、受光素子２―３の出力は初段の
反転増幅回路１１のゲインと定電圧回路１３の電
圧値によつて決定され、その出力変動は数パーセ
ント以下に押えられる。第１図で説明したよう
に、受光素子２―１，２―２は上記受光素子２―
３と一体にモノリシツクタイプ等で形成され、し
かも同一発光ダイオード１の光を受光するため、
受光素子２―１，２―２の出力は補償用受光素子
２―３の出力と同様に安定化されることになる。
即ち、検出回路２０，３０の位置信号Ａ，Ｂはフ
イードバツク補償回路１０の誤差内でのみ変動す
る。この時、サーボ制御の指令信号として使用す
る基準電圧として、反転増幅回路１１の出力を取
り込む基準電圧回路１５から得るようにすれば、
上記位置信号Ａ，Ｂの変動は相対的に無視でき
る。また、検出回路２０，３０のバイアスとして
基準電圧回路１５の出力を反転した信号を使用す
れば、バイアス変動も軽減できる。 In FIG. 3, the feedback compensation circuit 10
always feeds back the output of the compensation light receiving element 2-3 that receives the light from the light emitting diode 1 to the current amplifier circuit 12 through the inverting amplifier circuit 11, and compares this with the output of the constant voltage circuit 13 to calculate temperature, voltage fluctuations, etc. When the output of the light-receiving element 2-3 decreases, the current of the light-emitting diode 1 increases, and conversely, the output of the light-receiving element 2-3 decreases.
When the output of the light emitting diode 3 increases, the current of the light emitting diode 1 decreases, and furthermore, the drift of the current amplification circuit 12 is compensated by the drift compensation circuit 14. Therefore, the output of the light-receiving element 2-3 is determined by the gain of the first stage inverting amplifier circuit 11 and the voltage value of the constant voltage circuit 13, and the fluctuation in the output can be suppressed to several percent or less. As explained in FIG. 1, the light receiving elements 2-1 and 2-2 are
3 and is formed of a monolithic type, etc., and receives light from the same light emitting diode 1,
The outputs of the light receiving elements 2-1 and 2-2 are stabilized in the same way as the output of the compensation light receiving element 2-3.
That is, the position signals A and B of the detection circuits 20 and 30 vary only within the error of the feedback compensation circuit 10. At this time, if the reference voltage used as a command signal for servo control is obtained from the reference voltage circuit 15 that takes in the output of the inverting amplifier circuit 11,
The fluctuations in the position signals A and B are relatively negligible. Further, by using a signal obtained by inverting the output of the reference voltage circuit 15 as a bias for the detection circuits 20 and 30, bias fluctuations can also be reduced.
ところで、第３図において、電流増幅回路１２
のドリフトは電流温度ドリフト補償回路１４によ
り補償されるが、先に提案した回路では完全では
なかつた。そこで、本発明の実施例では、電流増
幅回路１２の終段トランジスタとほゞ同一特性を
有する補償用トランジスタを定電圧回路１３と直
列に挿入して電流温度ドリフト補償回路１４を形
成するとゝもに、該補償用トランジスタのベース
とグランド間に抵抗を接続し、又、コレクタを接
地することによつて、両トランジスタの消費電力
をほゞ等しく、且つ同一温度条件のもとで、電流
増幅回路の終段トランジスタのベースに接続され
ている入力抵抗の電圧降下とそのベース・エミツ
タ電圧降下を補償用トランジスタのベース・エミ
ツタ電圧とそのベースに接続した抵抗の電圧降下
で相殺し、電流増幅回路１２の終段トランジスタ
のベース電流による影響も含めてドリフトをほゞ
完全に無くそうとするものである。 By the way, in FIG. 3, the current amplification circuit 12
Although the drift of is compensated by the current-temperature drift compensation circuit 14, the circuit proposed earlier was not perfect. Therefore, in the embodiment of the present invention, a compensation transistor having substantially the same characteristics as the final stage transistor of the current amplifier circuit 12 is inserted in series with the constant voltage circuit 13 to form the current temperature drift compensation circuit 14. By connecting a resistor between the base and ground of the compensation transistor and grounding the collector, the power consumption of both transistors can be made almost equal and the current amplification circuit can be operated under the same temperature condition. The voltage drop of the input resistor connected to the base of the final stage transistor and its base-emitter voltage drop are offset by the base-emitter voltage of the compensation transistor and the voltage drop of the resistor connected to its base, and the current amplifier circuit 12 The aim is to almost completely eliminate drift, including the influence of the base current of the final stage transistor.
第４図は本発明の一実施例を示したもので、第
３図と対応する部分には同一の記号を付し、破線
で囲つて示している。 FIG. 4 shows an embodiment of the present invention, in which parts corresponding to those in FIG. 3 are given the same symbols and surrounded by broken lines.
この種のフオトセンサ回路の安定性は補償用受
光素子の出力電圧の安定性により定まる。第４図
の回路において、ドリフト補償回路１４が設けら
れていないとすると、該フオトセンサ回路の補償
用受光素子２―３の出力電圧V2-3は、増幅器
AMPA―２のゲインを１とすると、次の(1)式で
表わされる。 The stability of this type of photo sensor circuit is determined by the stability of the output voltage of the compensation light receiving element. In the circuit of FIG. 4, if the drift compensation circuit 14 is not provided, the output voltage V 2-3 of the compensation light receiving element 2-3 of the photo sensor circuit is
Assuming that the gain of AMPA-2 is 1, it is expressed by the following equation (1).
V2-3＝VZ―VBE1―Ib1・R1／Ｇ (1)
たゞし、
Ｇ：増幅器AMP―１のゲイン
VZ：ツエナー・ダイオードZDの電圧
VBE1：トランジスタTR―１のベース・エミツ
タ電圧
Ib1：トランジスタTR―１のベース電流
さらに、トランジスタTR―１の直流電流増幅
率をhFE1、トランジスタTR―１のエミツタ電流
をIE1とすると、トランジスタTR―１のベース電
流Ib1は次式で示される。 V 2-3 = V Z - V BE1 - I b1・R 1 /G (1) G: Gain of amplifier AMP-1 V Z : Voltage of Zener diode ZD V BE1 : Voltage of transistor TR-1 Base-emitter voltage I b1 : Base current of transistor TR-1 Furthermore, if the DC current amplification factor of transistor TR-1 is h FE1 and the emitter current of transistor TR-1 is I E1 , then the base current I of transistor TR-1 b1 is expressed by the following formula.
Ib1＝IE1／hFE1 (2) この(2)式を(1)に代入すると次式が得られる。 Ib 1 = I E1 /h FE1 (2) Substituting this equation (2) into (1) gives the following equation.
V2-3＝VZ―VBE1―IE1／hFE1R1／Ｇ (3)
この(3)式において、R1が充分小さく、hFE1が充
分大きいとすると、次の(4)式が得られる。 V 2-3 = V Z ―V BE1 ―I E1 /h FE1 R 1 /G (3) In this formula (3), if R 1 is sufficiently small and h FE1 is sufficiently large, then the following formula (4) is obtained.
V2-3＝VZ―VBE1／Ｇ (4)
(4)式に注目するに、―VBE1は温度変動により変
動するドリフト要因となる。 V 2-3 =V Z -V BE1 /G (4) Focusing on equation (4), -V BE1 is a drift factor that changes due to temperature fluctuations.
次に、第４図に示すようにドリフト補償回路１
４を加えた場合について説明する。今、トランジ
スタTR―２のベース・エミツタ電圧をVBE2、ト
ランジスタTR―２のエミツタ電流をIE2、トラン
ジスタTR―２の直流電流増幅率をhFE2とすると、
補償用受光素子２―３の出力電圧V2-3として、
次の(5)式が得られる。 Next, as shown in FIG. 4, the drift compensation circuit 1
The case where 4 is added will be explained. Now, if the base-emitter voltage of transistor TR-2 is V BE2 , the emitter current of transistor TR-2 is I E2 , and the DC current amplification factor of transistor TR-2 is h FE2 , then
As the output voltage V 2-3 of the compensation photodetector 2-3,
The following equation (5) is obtained.
V2-3＝VZ―VBE1―1E1／hFE1R1＋VBE2＋IE2／hFE2R2／
Ｇ(5)
この(5)式において、R1，R2が充分小さく、
hFE1，hFE2が充分大きいとすると、次の(6)式が得
られる。 V 2-3 =V Z -V BE1 -1 E1 /h FE1 R 1 +V BE2 +I E2 /h FE2 R 2 /
G(5) In this equation (5), R 1 and R 2 are sufficiently small,
Assuming that h FE1 and h FE2 are sufficiently large, the following equation (6) can be obtained.
V2-3＝VZ―VBE1＋VBE2／Ｇ (6)
上記(6)式中の（―VBE1＋VBE2）は、トランジス
タTR―１，TR―２を同一使用条件下に置くこ
とにより、零又は温度、エミツタ電流の変化に対
して一定値をとる。従つて、補償用受光素子２―
３の出力電圧V2-3は定電圧回路１３に含まれて
いるツエナー・ダイオードZDおよび増幅器AMP
―１のゲインで決定され、トランジスタTR―１
のエミツタ電流、温度等に無関係に一定となる。
すなわち、トランジスタTR―１のベース入力抵
抗R1による電圧降下の影響がほゞ完全に相殺さ
れ、更に、（VBE2―VBE1）の温度ドリフトが完全
に無くなる。なお、ツエナー・ダイオードZDの
かわりに他の定電圧源を用いても同様である。 V 2-3 = V Z -V BE1 +V BE2 /G (6) (-V BE1 +V BE2 ) in the above equation (6) can be calculated by placing transistors TR-1 and TR-2 under the same operating conditions. , takes a constant value with respect to changes in zero, temperature, and emitter current. Therefore, the compensation light receiving element 2-
The output voltage V 2-3 of 3 is the Zener diode ZD and amplifier AMP included in the constant voltage circuit 13.
-1 gain, transistor TR-1
It remains constant regardless of emitter current, temperature, etc.
That is, the influence of the voltage drop due to the base input resistance R1 of the transistor TR-1 is almost completely canceled out, and furthermore, the temperature drift of (V BE2 - V BE1 ) is completely eliminated. Note that the same effect can be obtained even if another constant voltage source is used instead of the Zener diode ZD.
受光素子２―１，２―２の出力信号は第２図で
も分かるようにアース電位に対して負電圧で出力
され、直流分に交流分が重畳された形となり、交
流分は互いに90゜の位相差を有している。この受
光素子２―１，２―２の出力を増幅器AMP―５，
AMP―７で増幅した後、増幅器AMP―２の出力
が供給されるポテンシヨメータVR―１，VR―
２で交流分の中心にバイアスをセツトし、次段の
増幅器AMP―６，AMP―８で増幅すると位置信
号Ａ，Ｂが得られる。又、サーボ制御の指令信号
として使用する基準電圧は増幅器AMP―３から
取り出す。 As can be seen in Fig. 2, the output signals of the light receiving elements 2-1 and 2-2 are output as negative voltages with respect to the ground potential, and have a form in which an alternating current component is superimposed on a direct current component, and the alternating current components are at an angle of 90 degrees from each other. It has a phase difference. The outputs of the light receiving elements 2-1 and 2-2 are connected to the amplifier AMP-5,
After being amplified by AMP-7, the output of amplifier AMP-2 is supplied to potentiometers VR-1 and VR-
The bias is set at the center of the alternating current component in Step 2, and the position signals A and B are obtained by amplifying it in the next stage amplifiers AMP-6 and AMP-8. Further, the reference voltage used as a command signal for servo control is taken out from the amplifier AMP-3.
以上の説明から明らかな如く、本発明によれ
ば、フオトセンサ回路の出力を、温度、経年変化
に対して安定化させることができる。即ち、補償
用受光素子の出力で安定化した単一の光源の光を
検出用受光素子が受光するので、フオトセンサ回
路の出力がきわめて安定する。したがつて、本発
明によるフオトセンサを使用した位置決め装置に
おいては、高精度な位置決めが可能となる。 As is clear from the above description, according to the present invention, the output of the photo sensor circuit can be stabilized against changes in temperature and aging. That is, since the detection light receiving element receives light from a single light source stabilized by the output of the compensation light receiving element, the output of the photo sensor circuit is extremely stable. Therefore, in the positioning device using the photo sensor according to the present invention, highly accurate positioning is possible.
第１図は本発明に適用するフオトセンサ部の一
実施例を示す図、第２図はフオトセンサの出力波
形図、第３図は本発明の原理を説明するためのブ
ロツク図、第４図は本発明の一実施例の具体的回
路図である。
１…発光ダイオード、２…フオトダイオードア
レイ、２―１，２―２…位置信号検出用受光素
子、２―３…補償用受光素子、１０…フイードバ
ツク補償回路、２０，３０…位置信号検出回路、
１１…反転増幅回路、１２…電流増幅回路、１３
…定電圧回路、１４…電流温度ドリフト補償回
路、１５…基準電圧回路、２１…反転増幅回路、
２２…バイアス及び反転増幅回路。
FIG. 1 is a diagram showing an embodiment of the photo sensor section applied to the present invention, FIG. 2 is an output waveform diagram of the photo sensor, FIG. 3 is a block diagram for explaining the principle of the present invention, and FIG. 4 is a diagram of the present invention. FIG. 1 is a specific circuit diagram of an embodiment of the invention. DESCRIPTION OF SYMBOLS 1... Light emitting diode, 2... Photodiode array, 2-1, 2-2... Light receiving element for position signal detection, 2-3... Light receiving element for compensation, 10... Feedback compensation circuit, 20, 30... Position signal detection circuit,
11... Inverting amplifier circuit, 12... Current amplifier circuit, 13
... constant voltage circuit, 14 ... current temperature drift compensation circuit, 15 ... reference voltage circuit, 21 ... inverting amplifier circuit,
22...Bias and inverting amplifier circuit.
Claims (1)
る検出用受光素子及び補償用受光素子と、 前記光源の電流値を決める定電圧源と、 前記光源を駆動する第１のトランジスタを含
み、前記補償用受光素子の出力を第１のトランジ
スタのベースにフイードバツクし、該第１のトラ
ンジスタの出力値と前記定電圧源の値とを比較
し、前記補償用受光素子の出力変動に応じて前記
光源の駆動電流を制御する電流増幅回路と、 前記電流増幅回路の前記第１のトランジスタと
ほゞ同一特性の第２のトランジスタを含み、該第
２のトランジスタを前記定電圧源に直列に挿入し
て、前記第１のトランジスタのドリフトを相殺す
るドリフト補償回路とからなることを特徴とする
フオトセンサ回路。 ２ 前記検出用受光素子の出力は前記補償用受光
素子の出力に基づくレベルによりバイアスがかけ
られていることを特徴とする特許請求の範囲第１
項記のフオトセンサ回路。[Scope of Claims] 1. A single light source, a detection light-receiving element and a compensation light-receiving element that respectively receive light from the light source, a constant voltage source that determines the current value of the light source, and a voltage source that drives the light source. 1 transistor, the output of the compensating light receiving element is fed back to the base of the first transistor, the output value of the first transistor is compared with the value of the constant voltage source, and the output of the compensating light receiving element is a current amplification circuit that controls the driving current of the light source according to output fluctuation; and a second transistor having substantially the same characteristics as the first transistor of the current amplification circuit, the second transistor being connected to the constant voltage. and a drift compensation circuit inserted in series with a power source to cancel the drift of the first transistor. 2. Claim 1, wherein the output of the detection light-receiving element is biased by a level based on the output of the compensation light-receiving element.
Photo sensor circuit as described in section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15847777A JPS5493384A (en) | 1977-12-31 | 1977-12-31 | Stabilizing system for photo sensing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15847777A JPS5493384A (en) | 1977-12-31 | 1977-12-31 | Stabilizing system for photo sensing circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5493384A JPS5493384A (en) | 1979-07-24 |
| JPS6326403B2 true JPS6326403B2 (en) | 1988-05-30 |
Family
ID=15672587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15847777A Granted JPS5493384A (en) | 1977-12-31 | 1977-12-31 | Stabilizing system for photo sensing circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5493384A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09156305A (en) * | 1995-12-08 | 1997-06-17 | Kokuyo Co Ltd | Caster mounting structure for display fixtures |
-
1977
- 1977-12-31 JP JP15847777A patent/JPS5493384A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09156305A (en) * | 1995-12-08 | 1997-06-17 | Kokuyo Co Ltd | Caster mounting structure for display fixtures |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5493384A (en) | 1979-07-24 |
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