JPS59125018A - Encoder circuit - Google Patents
Encoder circuitInfo
- Publication number
- JPS59125018A JPS59125018A JP23330182A JP23330182A JPS59125018A JP S59125018 A JPS59125018 A JP S59125018A JP 23330182 A JP23330182 A JP 23330182A JP 23330182 A JP23330182 A JP 23330182A JP S59125018 A JPS59125018 A JP S59125018A
- Authority
- JP
- Japan
- Prior art keywords
- output
- light
- light emitting
- circuit
- wave
- 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
Links
- 230000007257 malfunction Effects 0.000 abstract description 5
- 230000003287 optical effect Effects 0.000 abstract description 2
- 230000007423 decrease Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 11
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 101100472050 Caenorhabditis elegans rpl-2 gene Proteins 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/36—Forming the light into pulses
- G01D5/366—Particular pulse shapes
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optical Transform (AREA)
Abstract
Description
【発明の詳細な説明】
〔技術分野〕
本発明は、発光素子と受光素子との闇に設けたスリット
板の位置の変化をパルス列に変換するエンコータ回路に
関するものである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an encoder circuit that converts changes in the position of a slit plate provided between a light emitting element and a light receiving element into a pulse train.
従来のエンコータ回路は、第１図のように、光を発する
発光素子（発光ダイオード）（１）と受光素子Ｃフォト
タイオード）（２）との間にスリット板（３）を設け、
スリット板（３）の位置の変化により断続された光を受
光素子（２）で受光し第２図ｆａｌのような近似正弦波
の受光出力を得て、この受光出力をコシパレータ（４）
の一方の入力に入力してコンパレータ（４）で基準電圧
と比較し、スレッショルドレベルを適当に設定すること
により出力に第２図（ｂｌのような矩形波出力を得てい
た。しかるに、発光素子（１）に用いる発光タイオード
は第３図のような温度特性を有し、受光素子（２）に用
いるフォトタイオードは第４図のような温度特性を有し
ており、Ｊ＋’ｆｌ囲温度が上昇すると発光出力は低下
し、受光感度は上昇する。例えば、１００°Ｃの場合、
発光出力は５０％低下し、受光感度は３０％上昇するた
め、総合的な受光出力は２０％低下して第５図（ａ）の
ようになる。このため、出力の矩形波は第５図（ｂ）の
ようになってデユーティ比が５０％でなくなり、ＰＬＬ
方式の速度制御を行なう場合又は位相の９０゜ずれた出
力によって回転方向を検出する場合に不都合があった。As shown in Fig. 1, the conventional encoder circuit includes a slit plate (3) between a light emitting element (light emitting diode) (1) that emits light and a light receiving element (photodiode) (2).
The light receiving element (2) receives the light that is interrupted by the change in the position of the slit plate (3), and obtains a light receiving output of an approximate sine wave as shown in Fig. 2 fal.
By inputting it into one input of the light emitting element and comparing it with the reference voltage using the comparator (4) and setting the threshold level appropriately, a rectangular wave output as shown in Fig. 2 (bl) was obtained. The light emitting diode used in (1) has the temperature characteristics as shown in Figure 3, and the photodiode used in the light receiving element (2) has the temperature characteristics as shown in Figure 4. When the
Since the light emitting output decreases by 50% and the light receiving sensitivity increases by 30%, the overall light receiving output decreases by 20%, as shown in FIG. 5(a). Therefore, the output rectangular wave becomes as shown in Fig. 5(b), and the duty ratio is no longer 50%, and the PLL
This is inconvenient when performing speed control using this method or when detecting the rotation direction using outputs that are out of phase by 90 degrees.
〔発明の目的Ｊ
本発明の目的とするところは、高温になっても矩形波出
力のデユーティ比が５０％より変化しないようにしてエ
ンコータ出力を用いてＰＬＬ制御を行なう場合や９０°
ずれた２つの出力より方向判別を行なう場合にも誤動作
のない回路を設計でき、全体の信頼性を向上することに
あり、他の目的とするところは、回路構成か簡単で安価
に温度補償をすることにあり、別の目的とするところは
、精度よく温度補償することにある。[Objective of the Invention J The object of the present invention is to prevent the duty ratio of the rectangular wave output from changing below 50% even at high temperatures, and to perform PLL control using the encoder output or 90°
The purpose is to design a circuit that does not malfunction even when determining direction using two outputs that are shifted from each other, and to improve overall reliability.Another objective is to design a circuit that does not malfunction even when determining direction using two outputs that are shifted from each other, and to improve overall reliability. Another objective is to perform accurate temperature compensation.
本発明は、受令光素子（２）、］コンパレータ４）等よ
り成る受光部、発光素子（１）より成る発光部に温度補
償機能を付加して高温になっても矩形波出力のデユーテ
ィ比が５０％より変化しないようにしたものである。The present invention adds a temperature compensation function to a light receiving section consisting of a receiving optical element (2), a comparator 4), etc., and a light emitting section consisting of a light emitting element (1), so that the duty ratio of the rectangular wave output can be maintained even at high temperatures. is set such that the change does not exceed 50%.
（実施例）
第６図は本発明の一実施例で、（１）は発光素子、（２
）は受光素子、（３）はスリット板、（４）はコンパレ
ータで、これらは第１図の従来例と同じである。（５）
は温度補償用タイオードで、コンパし一タ（４）の基準
電圧回路に接続し、スレッショルドレベルを決めるもの
である。（６）はボルテージフォロアによる出力バッフ
ァである。又、コンパレータ（４）は立上りを速くしノ
イズによる誤動作を防止するために出力から帰還しシュ
ミツト回路構成としてし）る。(Example) FIG. 6 shows an example of the present invention, in which (1) is a light emitting element, (2
) is a light receiving element, (3) is a slit plate, and (4) is a comparator, which are the same as the conventional example shown in FIG. (5)
is a temperature compensation diode which is connected to the reference voltage circuit of the comparator (4) to determine the threshold level. (6) is an output buffer using a voltage follower. In addition, the comparator (4) is fed back from the output and configured as a Schmitt circuit in order to speed up the rise and prevent malfunctions due to noise.
（動 作）
発光素子（１）からの光出力はスリット板（３）で断続
されてその先爪は三角波的に変化する。これを受光素子
（２）で受光すれば前述のような近似正弦波の受光出力
が得られる。これを矩形波にするためには、適当なスレ
ッショルドしベルを決り）で受光出力とコンパレートす
る必要がある。ここで、］コンパレータ４）に第６図の
ように温度補償用タイオート（シリコシタイオード）（
５）を接続すると、温度補償用タイオード（５）は第７
図のような特性を有しているので、受光出力が“Ｉ］”
のときは第８図（ａｌのような接続になり、“Ｌ″のと
きは第８図（Ｌ＋１のようになり、Ｖ’ｒｎ−ｕ （！
： ＶＴＨ−Ｌの２つの電圧が得られ、シュミツト回路
が構成される。受光出力とスレッショルドレベルとの整
合は受光素子（２）の負荷ＲｐＬにより行ない、負荷Ｒ
ｐＬが大きいときの出力電圧ＥＩ）Ｌ 、−Ｉは第９図
のように、負荷ＲｐＬが小さいときの出力電圧より大き
くなる。尚、第９図でＲｐＬ−＋＞ＲｐＬ−２である。(Operation) The light output from the light emitting element (1) is interrupted by the slit plate (3), and its tip changes in a triangular wave pattern. If this light is received by the light receiving element (2), a light receiving output of an approximate sine wave as described above can be obtained. In order to convert this into a rectangular wave, it is necessary to compare it with the light reception output using an appropriate threshold (determine the bell). Here, the comparator 4) is connected to a temperature compensation tie-out (silicon tie-off) (as shown in Fig. 6).
5), the temperature compensation diode (5) becomes the seventh
Since it has the characteristics shown in the figure, the received light output is “I”
When it is "L", the connection is as shown in Figure 8 (al), and when it is "L", it is as shown in Figure 8 (L+1), and V'rn-u (!
: Two voltages of VTH-L are obtained, and a Schmitt circuit is constructed. Matching of the light receiving output and the threshold level is performed by the load RpL of the light receiving element (2).
As shown in FIG. 9, the output voltage EI)L, -I when pL is large is larger than the output voltage when the load RpL is small. In addition, in FIG. 9, RpL-+>RpL-2.
周囲温度が上昇して１００℃になった場合、前述のよう
に、受光出力は２０％低下するが・スレッショルドレベ
ルを決めている温度補償用タイオード（５）の順方向電
圧が−２−べＣ程度で変化するので、ｉｏｏｏｃのとき
は、０．００２Ｘ１０９１０．７Ｘ１００＝ ２８ （
％）低下し、第１０図（ａ）の実線で示すようになって
受光出力の低下を相対的に相殺し、出力は第１０図（ｂ
）ノヨうにデユーティ比がほぼ５０％にできる。When the ambient temperature rises to 100 degrees Celsius, the received light output will drop by 20% as mentioned above, but the forward voltage of the temperature compensation diode (5) that determines the threshold level will be -2-below C. It changes depending on the degree, so for ioooc, 0.002X10910.7X100=28 (
%) decreases as shown by the solid line in Figure 10(a), which relatively offsets the decrease in the received light output, and the output decreases as shown by the solid line in Figure 10(b).
) The duty ratio can be almost 50%.
（第２実施例）
第１１図は本発明の他の実施例で、（７）はＶＢＥマル
チづライセで、発光素子（１）に直列に接続して温度に
よって発光素子（１）に流す電流を調整するものである
。（２）は受光素子、（３）はスリット板であり、（４
）はコンパレータで、第６図の実施例と同様にシュミツ
ト回路構成としている。（６）は出力バッファである。(Second Embodiment) Fig. 11 shows another embodiment of the present invention, in which (7) is a VBE multi-type licer, which is connected in series to the light emitting element (1) and allows current to flow through the light emitting element (1) depending on the temperature. This is to adjust the (2) is a light receiving element, (3) is a slit plate, and (4
) is a comparator, which has a Schmidt circuit configuration similar to the embodiment shown in FIG. (6) is an output buffer.
（動 作）
発光素子（１）からの光出力はスリット板（３）で断続
され、その光量は三角波的に変化し、これを受光素子（
２）で受光することにより近似正弦波の受光出力が得ら
れる。これを適当なスレッショルドレベルを決めてコシ
パレータ（４）に入力すると矩形波出力が得られる。周
囲温度が約１００℃になった場合には、発光素子（１）
の光源は５０％にまで低下し、受光素子（２）の感度上
昇を差引いても受光出力は２０％低下する。そこで、発
光素子（１）に直列にＶＢＥマルチプライｔ−（７）を
接続することにより、トランジスタＱのＶＢＨの低下に
伴なってＶＢＥマルチプライ’Ｆ’ （７）の両端の電
圧も低下し、発光素子（１）の印加電圧が亮くなる。即
ち、ｖＢＥマルチプライセ（７）の両端電圧Ｖは、
■−ＶＢＥＲ１＋Ｒ
で表わされ、トラン５スタＱのＶＢＥが温度上昇により
低下するとＶＢＥマ；ルチプライｉ’ （７）の両端電
圧Ｖも低下し、発光素子（１）の印加電圧が高くなる。(Operation) The light output from the light emitting element (1) is interrupted by the slit plate (3), and the amount of light changes in a triangular wave pattern, which is transmitted to the light receiving element (
By receiving light in step 2), a light receiving output of an approximate sine wave can be obtained. By determining an appropriate threshold level and inputting this to the cosciparator (4), a rectangular wave output can be obtained. When the ambient temperature reaches approximately 100℃, the light emitting element (1)
The light source decreases to 50%, and even after subtracting the increase in sensitivity of the light receiving element (2), the light receiving output decreases by 20%. Therefore, by connecting the VBE multiply t-(7) in series with the light emitting element (1), as the VBH of the transistor Q decreases, the voltage across the VBE multiply 'F' (7) also decreases. , the voltage applied to the light emitting element (1) becomes brighter. That is, the voltage V across the vBE multiply (7) is expressed as -VBER1+R, and when the VBE of the transformer 5-star Q decreases due to temperature rise, the voltage V across the VBE multiply i' (7) also decreases, The voltage applied to the light emitting element (1) increases.
その結果、発光素子（１）のＩｌｉ電流が増加し、発光
量と順電流とは第１２図のような関係があるため、発光
量が増加し、高温での特性が補償できる。As a result, the Ili current of the light emitting element (1) increases, and since the amount of light emitted and the forward current have a relationship as shown in FIG. 12, the amount of light emitted increases and the characteristics at high temperatures can be compensated.
本発明は上述のように、受光部又は発光部に温度補償機
能をイ」加したから、府ｌ温になっても矩形波出力のデ
ユーティ比が５０％より変化しないようにでき、エンコ
ータ出力を用いてＰＬＬ制御を行なう場合や９０°ずれ
た２つの出力より方向判別を行なう場合にも誤動作のな
い回路を容易に設計でき、全体の信頼性を向上でき、又
、コンパレータの基鵡ｉ電圧回路Ｊこ温度補償用ダイオ
ードを接続したから、回路構成が簡単で、安価に温度補
ｆαでき、更に、発光素子に直列にＶＢＥマ、ル゛チプ
ライヤを接続したから、精度よく温度補償力（できると
いう効果を奏するものである。As described above, the present invention has added a temperature compensation function to the light receiving section or the light emitting section, so that the duty ratio of the rectangular wave output can be prevented from changing below 50% even when the temperature reaches 100 degrees, and the encoder output can be adjusted. It is possible to easily design a circuit that does not malfunction even when performing PLL control using PLL control or when determining direction from two outputs shifted by 90 degrees, improving overall reliability. Since a temperature compensation diode is connected here, the circuit configuration is simple and temperature compensation fα can be performed at low cost.Furthermore, since a VBE multiplier is connected in series with the light emitting element, temperature compensation power can be achieved with high accuracy. It is effective.
第１図は従来のエンコータ回路の回路図、第２図（ａ）
（ｂ）は同上の常温時の要部出力波形図、負１３図は
同上の発生素子の温度特性図、第４図番よ［］−ヒの受
光素子の温度特性図、第５図（ａ） （ｂ） Ｇま従来
のエンコータ回路の高温時の要部出力波形図、第６図は
本発明の一実施例の回路図、第７図は同上の温度補償用
タイオードの特性図、第８図（ａｌ （ｂ） ｌよＩｒ
−ｊｌ上の等価回路図、第９図は同上の受光素子の特性
図、第１０図（ａ） （ｂ）は第６図の実施例の高温時
の要（ｆｌＩＩ出力波形図、第１１図は本発明の他の実
施例の回路図、第１２図は同上の発光素子の特性図であ
る（１）・発光素子、（２）・・受光素子、（３）
スリ・ント板、（４）・・コンパレータ、（５）・・・
温度補償用タイオード、（７）・・・ＶＢＥマルチづラ
イ１′。
代理人 弁理士 石 １）長 上
第 １図
第２図
一↑
箇３図
囚団席度（”Ｃ）
第４図
第６閾
第９図
Ｍ２Ｏ図
−を
第１１図
第１２図
朋屯洗
手 続 補 正 書（自発）
昭和５９年 １月３０日
才・５許庁長宮殿
１、事件の表示
昭和５７年特ｆＦ願第２３３３０１男
２、発 明の名称
エンコータ回路
３、補正をする者
事件との関係 特許出願人性 所 大
阪府門真市太字門真１０４８番地名 称 （５８３）松
下電工株式会社
代表者小 林 郁
４、代理人
５、補正命令の日付
９２−
第９−
卯加電Ｌ（Ｖ）Figure 1 is a circuit diagram of a conventional encoder circuit, Figure 2 (a)
(b) is a diagram of the main part output waveform at room temperature as above, Figure 13 is a temperature characteristic diagram of the generating element as above, Figure 4 is a temperature characteristic diagram of the light receiving element of number []-hi, Figure 5 (a) (b) Figure 6 is a circuit diagram of an embodiment of the present invention, Figure 7 is a characteristic diagram of the same temperature compensation diode, Figure 8 is a diagram of the output waveforms of main parts of a conventional encoder circuit at high temperatures. Figure (al (b) lyoIr
Fig. 9 is a characteristic diagram of the light-receiving element shown above, Fig. 10 (a) (b) shows the main points of the embodiment shown in Fig. 6 at high temperature (flII output waveform diagram, Fig. 11) 12 is a circuit diagram of another embodiment of the present invention, and FIG. 12 is a characteristic diagram of the same light emitting element as above. (1) Light emitting element, (2) Light receiving element, (3)
Sliding board, (4)... Comparator, (5)...
Temperature compensation diode, (7)...VBE multi-wire 1'. Agent Patent Attorney Ishi 1) Chief Figure 1 Figure 2 Figure 1 ↑ Figure 3 Prisoner's seat degree (''C) Figure 4 Figure 6 Threshold Figure 9 M2O Figure - Figure 11 Figure 12 Hotun Washing Hand Continuing amendment (self-motivated) January 30, 1980, 5th Minister's Palace 1, Indication of the case, 1988 Patent Application No. 233301 Man 2, Name of the invention Encoder circuit 3, Case of the person making the amendment Relationship with Patent Applicant Location 1048 Bold Kadoma, Kadoma City, Osaka Name (583) Matsushita Electric Works Co., Ltd. Representative Iku Kobayashi 4, Agent 5, Date of Amendment Order 92- No. 9- Den Uka L (V )
Claims (2)
れた光を受光する受光素子と、前記受光素子の受光出力
と基準電圧とを比較し矩形波を出力するコンパレータと
より成るエンコーダ回路において、受光部又は発光部に
温度補償機能を付加して成ることを特徴とするエンコー
タ回路。(1) In an encoder circuit comprising a light-emitting element that emits light, a light-receiving element that receives light interrupted by a slit plate, and a comparator that compares the light-receiving output of the light-receiving element with a reference voltage and outputs a rectangular wave, An encoder circuit characterized in that a temperature compensation function is added to a light receiving section or a light emitting section.
イオードを接続して成ることを特徴とする特許絖して成
ることを特徴とする特許請求の範囲第１項記載のエンコ
ータ回路。(2) The encoder circuit according to claim 1, characterized in that it is formed by connecting a temperature compensating diode to the reference voltage circuit of the comparator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23330182A JPS59125018A (en) | 1982-12-29 | 1982-12-29 | Encoder circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23330182A JPS59125018A (en) | 1982-12-29 | 1982-12-29 | Encoder circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59125018A true JPS59125018A (en) | 1984-07-19 |
Family
ID=16952962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23330182A Pending JPS59125018A (en) | 1982-12-29 | 1982-12-29 | Encoder circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59125018A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0248408A2 (en) * | 1986-06-02 | 1987-12-09 | OMRON Corporation | A reflection type photo-electric switch |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4897557A (en) * | 1972-03-27 | 1973-12-12 | ||
| JPS5355053A (en) * | 1976-10-29 | 1978-05-19 | Olympus Optical Co Ltd | Photoelectric encoder |
-
1982
- 1982-12-29 JP JP23330182A patent/JPS59125018A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4897557A (en) * | 1972-03-27 | 1973-12-12 | ||
| JPS5355053A (en) * | 1976-10-29 | 1978-05-19 | Olympus Optical Co Ltd | Photoelectric encoder |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0248408A2 (en) * | 1986-06-02 | 1987-12-09 | OMRON Corporation | A reflection type photo-electric switch |
| US4926049A (en) * | 1986-06-02 | 1990-05-15 | Omron Tateisi Electronics Company | Reflection type photoelectric switch |
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