JPS59202022A - Optical encoder - Google Patents
Optical encoderInfo
- Publication number
- JPS59202022A JPS59202022A JP7684883A JP7684883A JPS59202022A JP S59202022 A JPS59202022 A JP S59202022A JP 7684883 A JP7684883 A JP 7684883A JP 7684883 A JP7684883 A JP 7684883A JP S59202022 A JPS59202022 A JP S59202022A
- Authority
- JP
- Japan
- Prior art keywords
- light
- receiving element
- slit plate
- emitting element
- light emitting
- 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
- 230000003287 optical effect Effects 0.000 title description 11
- 230000001360 synchronised effect Effects 0.000 claims abstract description 16
- 238000001914 filtration Methods 0.000 abstract 1
- 238000007493 shaping process Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000003321 amplification Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001615 p wave Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P13/00—Indicating or recording presence, absence, or direction, of movement
- G01P13/02—Indicating direction only, e.g. by weather vane
- G01P13/04—Indicating positive or negative direction of a linear movement or clockwise or anti-clockwise direction of a rotational movement
- G01P13/045—Indicating positive or negative direction of a linear movement or clockwise or anti-clockwise direction of a rotational movement with speed indication
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)
- Optical Transform (AREA)
Abstract
Description
【発明の詳細な説明】
〔技術分野〕
この発明は変位および方向全光学的に検出するリニア式
およびロータリ式などのオプチカルエンコーダに関する
ものである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to optical encoders such as linear and rotary types that detect displacement and direction entirely optically.
従来のロータリ式のオプチカルエンコーダは、第１図に
示すように、同一半径の周上に等間隔に多数個のスリッ
ト１ａを有する回転スリット板１を、回転を検出すべき
回転軸２に軸結合し、第１および第２のスリン）３ａ、
３１）を有する固定スリット板３ケ、第１および第２の
スリ ノド３ａ 。As shown in Fig. 1, a conventional rotary optical encoder consists of a rotary slit plate 1 having a large number of slits 1a arranged at equal intervals on a circumference of the same radius, and coupled to a rotating shaft 2 whose rotation is to be detected. and the first and second surin) 3a,
31), three fixed slit plates, first and second slit plates 3a.
３ｂがスリット１ａの移動軌跡上に位ｉ６°するように
、回転スリット板１に対向配置し、第１の受光素子４を
固定スリット板３の第１のスリブ）３ａに向かうように
配置するとともに第２の受光素子５を固定スリット板３
の第２のスリット３ｂに向かうように配置し、第１およ
び第２の発光素子６゜７を回転スリット板１および固定
スリット板３を介して第１および第２の受光素子４．５
にそれぞれ対向するように配置している。そして、第１
および第２の受光素子４．５の出力が信号処理回路８．
９によりそれぞれ増幅および波形整形されてパルス化さ
れるようになっている。なお、固定スリット板３の第１
および第２のスリット３ａ 、３ｂは、信号処理回路８
．９の出力パルスの位相が互いに９０度ずれるように位
置決めしている。The first light-receiving element 4 is arranged facing the rotating slit plate 1 so that the first light-receiving element 4 faces the first slit 3a of the fixed slit plate 3, and The slit plate 3 fixes the second light receiving element 5
The first and second light emitting elements 6.7 are connected to the first and second light receiving elements 4.5 through the rotating slit plate 1 and fixed slit plate 3.
They are placed so that they are facing each other. And the first
The output of the second light receiving element 4.5 is transmitted to the signal processing circuit 8.
9, the signals are respectively amplified and waveform-shaped and made into pulses. Note that the first part of the fixed slit plate 3
and the second slits 3a and 3b are the signal processing circuit 8
．． They are positioned so that the phases of the output pulses No. 9 are shifted by 90 degrees from each other.
つぎに、動作について説明する。発光素子６゜７は潜時
連続して点灯している。回転軸２が回転すると、それに
応じて回転スリット板１が回転する。この際回転スリッ
ト板１のスリットＩＲと固定スリット板３の第１のスリ
ット３ａとが重なったときに第１の発光素子６から第１
の受光素子４へ到達する光量が最大となり、スリブ）Ｉ
Ｒが左右どちらへ移動しても光量が減少し、スリブ）ｌ
ａが第１のスリットａａＱ間に位置したときに光量が最
小となる。したがって、第１の受光素子４の出力は回転
スリット板３が一定角度（スリットピッチ）回転する毎
に第２図（Ａ）に示すように変化することになる。第２
の受光素子５についても同様で、その出力は第２図（Ｂ
）に示すように変化する。Next, the operation will be explained. The light emitting element 6.7 is lit continuously for a latency period. When the rotating shaft 2 rotates, the rotating slit plate 1 rotates accordingly. At this time, when the slit IR of the rotating slit plate 1 and the first slit 3a of the fixed slit plate 3 overlap, the first light emitting element 6 to
The amount of light reaching the light-receiving element 4 of
The amount of light decreases when R moves to the left or right, and the slide)
When a is located between the first slits aaQ, the amount of light becomes the minimum. Therefore, the output of the first light receiving element 4 changes as shown in FIG. 2(A) every time the rotating slit plate 3 rotates by a certain angle (slit pitch). Second
The same goes for the light receiving element 5, and its output is shown in Figure 2 (B
).
この第２の受光素子５の出力は、回転スリット板１が正
方向に回転しているときは第１の受光素子４の出力より
位相が９０度遅れ、回転スリット板１が逆方向に回転し
ているときは逆に位相が９０度進むことになる。The output of this second light receiving element 5 is delayed in phase by 90 degrees from the output of the first light receiving element 4 when the rotating slit plate 1 is rotating in the forward direction, and when the rotating slit plate 1 is rotating in the opposite direction. On the contrary, the phase will advance by 90 degrees.
上記第１および第２の受光素子４，５の出力を信号処理
回路８，９で増幅および波形整形すれば、それぞれ第２
図（Ｃ） 、 （Ｄ）に示すようにパルス化される。第
２図ｔｃ） 、 ＣＤ）のパルスの個数は回転スリット
板１の回転角度に比例し、第２図Ｃ１、（ｒｌ）のパル
スの位相差（＋９０度または一９０度）は回転スリット
板１の回転方向を示すことになる。If the outputs of the first and second light-receiving elements 4 and 5 are amplified and waveform-shaped by the signal processing circuits 8 and 9, the second
It is pulsed as shown in Figures (C) and (D). The number of pulses in Fig. 2 tc) and CD) is proportional to the rotation angle of the rotating slit plate 1, and the phase difference (+90 degrees or -90 degrees) of the pulses in Fig. 2 C1 and (rl) is proportional to the rotation angle of the rotating slit plate 1. This indicates the direction of rotation.
しかし、このような従来のオプチカルエンコーダは、装
置全体を小型化するにつれて第１の発光素子６および第
１の受光素子４と第２の発光素子７および第２の受光素
子５との間で相互干渉が発生し、すなわち、第１の発光
素子６から第・２の受光素子５へ到達する光量および第
２の発光素子７から第１の受光素子４へ到達する光量が
増加し、信号対雑音比（Ｓ／Ｎ比）を低下させていた。However, in such a conventional optical encoder, as the entire device is miniaturized, the first light emitting element 6 and the first light receiving element 4 and the second light emitting element 7 and the second light receiving element 5 are not mutually connected. Interference occurs, that is, the amount of light reaching from the first light emitting element 6 to the second light receiving element 5 and the amount of light reaching the first light receiving element 4 from the second light emitting element 7 increase, and the signal-to-noise The ratio (S/N ratio) was lowered.
この発明は相互干渉を除去してＳＡ比を高めることがで
きるオプチカルエンコーダを提供することを目的とする
。An object of the present invention is to provide an optical encoder that can eliminate mutual interference and increase the SA ratio.
この発明のオプチカルエンコーダは、等間隔に多数個の
可動スリットを有する可動スリット板と、この可動スリ
ット板と対向配置し前記可動スリ。The optical encoder of the present invention includes a movable slit plate having a large number of movable slits at equal intervals, and a movable slit arranged opposite to the movable slit plate.
トの移動軌跡上に第１の固定スリットとこの第１の固定
スリットに対して電気的に一定位相ずれた位置に配置し
た第２の固定スリットとを有する固定スリット板と、前
記第１の固定スリットの位置で前記可動スリット板およ
び固定スリット板を介して対向する第１の発光素子およ
び第１の受光素子と、前記第２の固定スリットの位置で
前記可動スリット板および固定スリット板を介して対向
する第２の発光素子および第２の受光素子と、前記第１
の発光素子をパルス点灯させる第１のパルス点灯駆動回
路と、前記第２の発光素子をパルス点灯させる第２のパ
ルス点灯駆動回路と、前記第１の受光素子の出力を前記
第１の発光素子のパルス点灯と同期して同期整流する第
１の同期整流回路と、前記第２の受光素子の出力を前記
第２の発光素子のパルス点灯と同期して同期整流する第
２の同期整流回路と、前記第１および第２の同期整流回
路の出力をそれぞれ低域ｐ波する第１および第２のロー
パスフィルタとを備える構成にしたことを特徴とする。a fixed slit plate having a first fixed slit and a second fixed slit disposed at a position electrically shifted from a certain phase with respect to the first fixed slit on a movement locus of the first fixed slit; A first light-emitting element and a first light-receiving element that face each other through the movable slit plate and the fixed slit plate at the position of the slit, and a first light-emitting element and a first light-receiving element that face each other through the movable slit plate and the fixed slit plate at the position of the second fixed slit. a second light emitting element and a second light receiving element facing each other;
a first pulse lighting drive circuit that lights the light emitting element in pulses; a second pulse lighting drive circuit that pulses the second light emitting element; and a second pulse lighting drive circuit that lights the second light emitting element in pulses; a first synchronous rectifier circuit that synchronously rectifies the output of the second light receiving element in synchronization with the pulse lighting of the second light emitting element; The present invention is characterized in that it is configured to include first and second low-pass filters that convert the outputs of the first and second synchronous rectification circuits into low-frequency p-waves, respectively.
このように構成したことにより、第１の発光素子および
第１の受光素子と第２の発光素子および第２の受光素子
との間の相互干渉を防止することカテキ、５ｚ４Ｊ比を
高めることができる。With this configuration, it is possible to prevent mutual interference between the first light emitting element and the first light receiving element and the second light emitting element and the second light receiving element, and to increase the 5z4J ratio. .
この発明の一実施例を第３図ないし第５図に基づいて説
明する。第３図において、符号１〜７を付したものは、
第１図のものと同一構成である。An embodiment of the present invention will be described based on FIGS. 3 to 5. In FIG. 3, the numbers 1 to 7 are as follows:
It has the same configuration as the one in FIG.
１０および１１はそれぞれ相異なる周波数のパルス信号
を発生するパルス発生器であり、各パルス信号の周波数
は回転スリット板１の回転による光の断続の周波数より
高くしている。１２および１３はそれぞれパルス発生器
１０．１１のパルス信号に基づいて第１および第２の発
光素子６．７をそれぞれパルス点灯させる駆動回路、１
４および１５は第１および第２の受光素子４．５の出力
を増幅する増幅回路、１６は増幅回路１４の出力をパル
ス発生器１０から出力されるパルス信号に同期して同期
整流する同期整流回路、１７は増幅回路１５の出力をパ
ルス発生器１１がら出力されるパルス信号に同期して同
期整流する同期整流回路、１８および１９は同期整流回
路１６．１７の出力をそれぞれ低域沖波するローパスフ
ィルタ、２ｏおよび２１はローパスフィルタ１８．１９
の出方をそれぞれパルス化する波形整形回路、２２およ
び２３はそれぞれ出力端子である。10 and 11 are pulse generators that generate pulse signals of different frequencies, and the frequency of each pulse signal is set higher than the frequency of intermittent light generated by the rotation of the rotary slit plate 1. Reference numerals 12 and 13 indicate drive circuits 1 for lighting the first and second light emitting elements 6.7 in pulses based on pulse signals from the pulse generator 10.11, respectively;
4 and 15 are amplifier circuits that amplify the outputs of the first and second light receiving elements 4.5, and 16 is a synchronous rectifier that synchronously rectifies the output of the amplifier circuit 14 in synchronization with the pulse signal output from the pulse generator 10. 17 is a synchronous rectifier circuit that synchronously rectifies the output of the amplifier circuit 15 in synchronization with the pulse signal output from the pulse generator 11; 18 and 19 are low-pass circuits that synchronously rectify the output of the synchronous rectifier circuits 16 and 17, respectively; Filters, 2o and 21 are low pass filters 18.19
The waveform shaping circuits 22 and 23 are respectively output terminals for pulsing the output of the waveforms.
４図および第５図に基づいて説明する。パルス発生器ｌ
Ｏ力）ら第４図（Ａ）に示すような一定振幅のパルス信
号が発生し、駆動回路１２が上記パルス信号に基づいて
第１の発光素子６を一定光量でパルス点灯させる。一方
、回転スリット板１の回転により回転スリット板１およ
び固定スリット板３を通過する光量は第４図ＣＢ）のよ
うに変化する。その結果、第１の受光素子４の出力は第
４図（Ｃ） Ｋ示すように第４図Ａ）の波形を第４図（
Ｂ）の波形を振幅変調した波形となる。この第１の受光
素子４の出力を増幅回路１４により増幅して第４図（Ｄ
）の波形としたのち、同期整流回路１６で第４図（Ａ）
のパルス信号と同期した同期整流を行うと、第４図の）
の波形が得られ、この波形をローパスフィルタ１８に通
すと第４図ＣＦ）のようになり、第４図の）の光量変化
が電気信号として再現できる。この第４図旧の信号を波
形整形回路２０に刀１えて波形整形を行えば、第４図（
Ｇ）に示すように回転スリット板１０回転角度に比例し
た個数のパルスが出力端子２２より得られることになる
。This will be explained based on FIGS. 4 and 5. pulse generator l
A pulse signal with a constant amplitude as shown in FIG. 4(A) is generated from the pulse generator 12, and the drive circuit 12 pulse-lights the first light emitting element 6 with a constant light amount based on the pulse signal. On the other hand, as the rotating slit plate 1 rotates, the amount of light passing through the rotating slit plate 1 and the fixed slit plate 3 changes as shown in FIG. 4 CB). As a result, the output of the first light-receiving element 4 changes from the waveform of FIG. 4A) to the waveform of FIG.
The waveform is obtained by amplitude modulating the waveform of B). The output of the first light-receiving element 4 is amplified by the amplifier circuit 14, as shown in FIG.
), the synchronous rectifier circuit 16 generates the waveform shown in Fig. 4 (A).
When synchronous rectification is performed in synchronization with the pulse signal of Fig. 4)
A waveform is obtained, and when this waveform is passed through the low-pass filter 18, it becomes as shown in FIG. 4 (CF), and the change in light amount shown in FIG. 4) can be reproduced as an electrical signal. If the old signal shown in Fig. 4 is subjected to waveform shaping using the waveform shaping circuit 20, the signal shown in Fig. 4 (
As shown in G), the number of pulses proportional to the rotation angle of the rotary slit plate 10 is obtained from the output terminal 22.
なお、相互干渉により、第２の発光素子７の光が第１の
受光素子４に入射して第２の受光素子４の出力波形が第
５図（Δ）のようになった場合にも、これを増幅（−で
第５図（Ｂ）の波形を得、さらに同期整流を行えば＃ｒ
Ｇ ５図（Ｃ）の波形となり、これを低域Ｆ波すれば第
５図（ｒ））のようになり、第２の発光素子７からの入
射光による第１の受光素子４の出力変動分（雑音）は除
去できることになる。これは、第２の発光素子７の点灯
周期が第１の発光素子６の点灯周期とけ異なり、同期整
流を行ったとき（（雑音成分は相殺されるためである。Note that even when the light from the second light emitting element 7 enters the first light receiving element 4 due to mutual interference and the output waveform of the second light receiving element 4 becomes as shown in FIG. 5 (Δ), If this is amplified (-) to obtain the waveform shown in Figure 5 (B), and further synchronous rectification is performed, #r
G The waveform becomes as shown in Figure 5 (C), and if this is converted into a low-frequency F wave, it becomes as shown in Figure 5 (r)), and the output fluctuation of the first light receiving element 4 due to the incident light from the second light emitting element 7 (noise) can be removed. This is because the lighting period of the second light emitting element 7 is different from the lighting period of the first light emitting element 6, and when synchronous rectification is performed ((noise components are canceled out).
パルス発生器１１．駆動回路１３゜第２の発光素子７．
第２の受光素子５．増幅回路１５．同期整流回路１７．
ローパスフィルタ１９およヒ波形整形回路２１の動作け
、パルス点灯周波数が異なるだけで他は上記説明と同様
であるので、波形図および詳細な説明は省略する。ただ
し、波形整形回路２１から出力されるパルスは、固定ス
リット板３の第１および第２のスリット３ｇ 、３ｂの
位置関係から、従来例と同様に、回転スリット板１が正
回転のときは第４図（Ｇ）のパルスより９０度位相が遅
れ、回転スリット板１が逆回転のときは９０度位相が進
む。Pulse generator 11. Drive circuit 13° second light emitting element 7.
Second light receiving element 5. Amplification circuit 15. Synchronous rectifier circuit 17.
Since the operations of the low-pass filter 19 and the waveform shaping circuit 21 are the same as those described above except for the pulse lighting frequency, the waveform diagram and detailed explanation will be omitted. However, due to the positional relationship between the first and second slits 3g and 3b of the fixed slit plate 3, the pulses output from the waveform shaping circuit 21 are the same as in the conventional example when the rotating slit plate 1 rotates in the forward direction. The phase is delayed by 90 degrees from the pulse in FIG. 4 (G), and the phase is advanced by 90 degrees when the rotating slit plate 1 is rotating in the opposite direction.
このように構成した結果、相互干渉による雑音が除去さ
れ、装置を小型化してもＳ／Ｎ比を十分高いものとでき
る。As a result of this configuration, noise due to mutual interference is removed, and even if the device is downsized, the S/N ratio can be made sufficiently high.
なお、上記実施例は、ロータリ式のオプチカルエンコー
ダについて説明したが、リニア式のものについても同様
にこの発明を適用で姦る。また、対となった発光素子お
よび受光素子はスリット板に対する位置が逆でもよい。Although the above embodiments have been described with respect to a rotary type optical encoder, the present invention can also be applied to a linear type optical encoder. Furthermore, the paired light-emitting element and light-receiving element may be placed in opposite positions with respect to the slit plate.
さらに、９８に例はパルス発光の周波数を変えているが
、位相を変えるようにしてもよい。Furthermore, although the example shown in 98 changes the frequency of pulsed light emission, the phase may also be changed.
この発明のオプチカルエンコーダによれば、相互干渉に
よる雑音が除去され、装置を小型化してもＳ／Ｎ比を十
分高くできる。According to the optical encoder of the present invention, noise due to mutual interference is removed, and the S/N ratio can be made sufficiently high even when the device is miniaturized.
つぎに、開示技術について説明する。このオプチカルエ
ンコーダは、第３図のものと同一の目的を達成するもの
であり、第１図と同様の構成において、第１の発光素子
６として、例えばＧａＡｓを素材に用いた近赤外発光ダ
イオードを用い、第２の発光素子７として、例えばＧＡ
Ｐを素材に用いた緑色発光ダイオードを用い、第Ｊの受
を素子４の受ｊ（、１ｆｆｉに可視カットフィルタを１
寸設するとともに第２の受光素子５の受承面に赤外カッ
トフィルタを１寸設したものである。Next, the disclosed technology will be explained. This optical encoder achieves the same purpose as the one shown in FIG. 3, and has the same configuration as that shown in FIG. For example, GA is used as the second light emitting element 7.
A green light-emitting diode using P as the material is used, and the Jth receiver is connected to the receiver j of element 4 (, 1ffi with 1 visible cut filter).
In addition, an infrared cut filter is provided on the receiving surface of the second light receiving element 5.
このように構成すれば、第１の発光素子６から第２の受
光素子５へ入射しようとする近赤外光は赤外カットフィ
ルタにより遍〃テされ、また、第２の発光素子７から第
１の受光素子４へ入射しようとする緑色光は可視カット
フィルタにより遮断されることになり、相互干渉は防止
され、装置を小型化してもＳ２へ比を十分高くできる。With this configuration, the near-infrared light that is about to enter the second light-receiving element 5 from the first light-emitting element 6 is distributed by the infrared cut filter, and the near-infrared light that is about to enter the second light-receiving element 5 from the second light-emitting element 7 is distributed. The green light that is about to enter the first light-receiving element 4 is blocked by the visible cut filter, so mutual interference is prevented, and even if the device is miniaturized, the ratio to S2 can be made sufficiently high.
第１図は従来のオグチカルエンコーダの構収図、第２図
（Ａ）〜（Ｉ））はその各部の波形図、第３図はこの発
明の一実施例のブロック図、第４図（Ａ）〜Ｃ）および
第５図（Ａ）〜（Ｄ）はその各部の波形図である。
１・・回転スリット板、ＩＲ・・・スリット、３・・・
固定スリット板、３ｇ、３ｂ・・・スリット、４．５・
・・受光素子、６，７・・・発光素子、１０．１１・・
・パルス発生器、１２．１３・・駆動回路、１４．１５
・・・増幅回路、１６．１７・・同期整流回路、１８．
１９・・・ローパスフィルタ、２０．２１・・・波形整
形回路１：２−
吐土−・ ・
；ｉ；４ ｊｌ
；：、 ５ 。Fig. 1 is a composition diagram of a conventional optical encoder, Fig. 2 (A) to (I)) are waveform diagrams of each part thereof, Fig. 3 is a block diagram of an embodiment of the present invention, and Fig. 4 ( A) to C) and FIGS. 5A to 5D are waveform diagrams of each part thereof. 1...Rotating slit plate, IR...slit, 3...
Fixed slit plate, 3g, 3b...slit, 4.5.
... Light receiving element, 6,7... Light emitting element, 10.11...
・Pulse generator, 12.13...Drive circuit, 14.15
...Amplification circuit, 16.17...Synchronous rectification circuit, 18.
19...Low pass filter, 20.21...Waveform shaping circuit 1:2- soil-...;i;4 jl;:, 5.
Claims (1)
と、この可動スリット板と対向配置し前記可動スリット
の移動軌跡上に第１の固定スリットとこの第１の固定ス
リットに対して電気的に一定位相ずれた位置に配置した
第２の固定スリットとを有′する固定スリット板と、前
記第１の固定スリットの位置で前記可動スリット板およ
び固定スリット板を介して対向する第１の発光素子およ
び第１の受光素子と、前記第２の固定スリットの位置で
前記可動スリット板および固定スリット板を介して対向
する第２の発光素子および第２の受光米子と、前記第１
の発光素子をパルス点灯させる第１のパルス点灯駆動回
路と、前記第２の発光素子をパルス点灯させる第２のパ
ルス点灯駆動回路と、前記第１の受光素子の出力を前記
＠１の発光素子のパルス点灯と同期して同期整流する第
１の同期整流回路と、前記第２の受光素子の出力を前記
第２の発光素子のパルス点灯と同期して同期整流する第
２の同期整流回路と、前記第１および第２の同期整流回
路の出力をそれぞれ低域Ｆ波する第１および第２のロー
パスフィルタとを備えたオプチカルエンコーダ。a movable slit plate having a large number of movable slits at equal intervals; a first fixed slit arranged opposite to the movable slit plate; and a first fixed slit that is electrically constant with respect to the first fixed slit. a fixed slit plate having a second fixed slit disposed at a phase-shifted position; a first light emitting element that faces the movable slit plate and the fixed slit plate at the position of the first fixed slit; a first light receiving element, a second light emitting element and a second light receiving element facing each other through the movable slit plate and the fixed slit plate at the position of the second fixed slit;
a first pulse lighting drive circuit that pulse-lights the light emitting element of @1; a second pulse lighting drive circuit that pulses the second light emitting element; and a second pulse lighting drive circuit that pulses the light emitting element of @1; a first synchronous rectifier circuit that synchronously rectifies the output of the second light receiving element in synchronization with the pulse lighting of the second light emitting element; , first and second low-pass filters that convert the outputs of the first and second synchronous rectification circuits into low-frequency F waves, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7684883A JPS59202022A (en) | 1983-04-30 | 1983-04-30 | Optical encoder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7684883A JPS59202022A (en) | 1983-04-30 | 1983-04-30 | Optical encoder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59202022A true JPS59202022A (en) | 1984-11-15 |
Family
ID=13617074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7684883A Pending JPS59202022A (en) | 1983-04-30 | 1983-04-30 | Optical encoder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59202022A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61195309A (en) * | 1985-02-26 | 1986-08-29 | Seikosha Co Ltd | Photoelectric converting device |
| JPS61195310A (en) * | 1985-02-26 | 1986-08-29 | Seikosha Co Ltd | Photoelectric converting device |
-
1983
- 1983-04-30 JP JP7684883A patent/JPS59202022A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61195309A (en) * | 1985-02-26 | 1986-08-29 | Seikosha Co Ltd | Photoelectric converting device |
| JPS61195310A (en) * | 1985-02-26 | 1986-08-29 | Seikosha Co Ltd | Photoelectric converting device |
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