JPH0472169B2 - - Google Patents
Info
- Publication number
- JPH0472169B2 JPH0472169B2 JP58196179A JP19617983A JPH0472169B2 JP H0472169 B2 JPH0472169 B2 JP H0472169B2 JP 58196179 A JP58196179 A JP 58196179A JP 19617983 A JP19617983 A JP 19617983A JP H0472169 B2 JPH0472169 B2 JP H0472169B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- emitting element
- light emitting
- receiving element
- disk
- 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 - Lifetime
Links
- 239000000758 substrate Substances 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 102100025490 Slit homolog 1 protein Human genes 0.000 description 1
- 101710123186 Slit homolog 1 protein Proteins 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/22—Analogue/digital converters pattern-reading type
- H03M1/24—Analogue/digital converters pattern-reading type using relatively movable reader and disc or strip
- H03M1/28—Analogue/digital converters pattern-reading type using relatively movable reader and disc or strip with non-weighted coding
- H03M1/30—Analogue/digital converters pattern-reading type using relatively movable reader and disc or strip with non-weighted coding incremental
- H03M1/308—Analogue/digital converters pattern-reading type using relatively movable reader and disc or strip with non-weighted coding incremental with additional pattern means for determining the absolute position, e.g. reference marks
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Optical Transform (AREA)
Description
【発明の詳細な説明】
［技術分野］
本発明は回転機の速度や回転位置を制御するの
に用いられる光学式のロータリエンコーダに関
し、特にその発光素子の出力変化を補償するため
の受光素子を具えたロータリエンコーダに関す
る。[Detailed Description of the Invention] [Technical Field] The present invention relates to an optical rotary encoder used to control the speed and rotational position of a rotating machine, and in particular to a light-receiving element for compensating for changes in the output of its light-emitting element. The present invention relates to a rotary encoder equipped with a rotary encoder.
［従来技術］
第１図、第２図および第３図は一般的なこの種
の光学式ロータリエンコーダの一例を示す。ここ
で、１は回転軸２に取付けられた回転スリツトデ
イスクであり、デイスク１には第２図に示すよう
にその周辺部に沿つて１個のスリツト１Ａおよび
多数のスリツト１Ｂとが穿設されていて、この周
辺部と対向する位置に配置された固定スリツト板
３にはスリツト１Ａおよび多数のスリツト１Ｂと
重なり合う位置に固定スリツト３Ａ，３Ｂおよび
３Ｃが形成されている（第３図参照）。周知のご
とく、１Ａは１回転のホーム位置検出用であり、
１Ｂは位置例えば活字の位置検出用である。[Prior Art] FIGS. 1, 2, and 3 show an example of a general optical rotary encoder of this type. Here, 1 is a rotating slit disk attached to a rotating shaft 2, and the disk 1 has one slit 1A and a large number of slits 1B bored along its periphery as shown in FIG. The fixed slit plate 3, which is disposed at a position facing this peripheral part, has fixed slits 3A, 3B, and 3C formed at positions overlapping with the slit 1A and a large number of slits 1B (see Fig. 3). . As is well known, 1A is for detecting the home position of one rotation.
1B is for position detection, for example, the position of printed characters.
４は発光素子、５は複数の受光素子であり、デ
イスク１の回転に伴なつてそのスリツト１Ａが固
定スリツト３Ａ，３Ｂおよび３Ｃと重なり合う位
置ごとに、発光素子４からの光がこれらのスリツ
ト１Ａと３Ａ，３Ｂおよび３Ｃとを通過して受光
素子５に受光されるので、この受光される光量の
変化が電気信号に変換され出力されることによつ
て、その出力信号に応じて制御がなされる。 Reference numeral 4 indicates a light emitting element, and reference numeral 5 indicates a plurality of light receiving elements. As the disk 1 rotates, light from the light emitting element 4 passes through these slits 1A at each position where the slit 1A overlaps with the fixed slits 3A, 3B and 3C. 3A, 3B, and 3C and is received by the light receiving element 5. Changes in the amount of received light are converted into electrical signals and output, and control is performed according to the output signals. Ru.
また、受光素子５には第２図および第３図に示
すように発光素子４からの光が上記のスリツト１
Ａと３Ａ，３Ｂおよび３Ｃとを介することなく受
光される位置にモニター受光素子部５Ｍが設けて
あり、このモニター受光素子部５Ｍによつて発光
素子４からの発光出力を監視している。 Further, as shown in FIGS. 2 and 3, the light from the light emitting element 4 passes through the slit 1 to the light receiving element 5.
A monitor light receiving element section 5M is provided at a position where light is received without passing through A, 3A, 3B and 3C, and the light emission output from the light emitting element 4 is monitored by this monitor light receiving element section 5M.
すなわち、発光素子４は周囲温度の変化や経年
変化によつて、その発光出力が変化するので、こ
のような変化を補償するための発光量検出用とし
てモニター受光素子部５Ｍが設けられているの
で、受光素子部５Ｍでの受光量が常に一定となる
ように発光素子４を駆動する回路（図示せず）に
よつて発光素子４からの発光出力が制御される。 That is, since the light emitting element 4 changes its light emitting output due to changes in ambient temperature and changes over time, a monitor light receiving element section 5M is provided to detect the amount of light emitted to compensate for such changes. The light emission output from the light emitting element 4 is controlled by a circuit (not shown) that drives the light emitting element 4 so that the amount of light received by the light receiving element portion 5M is always constant.
しかしながら、このような従来のロータリエン
コーダでは、回転スリツトデイスク１にスリツト
１Ａを形成するのに、ガラス板の片面にスリツト
部分を残して金属膜を蒸着させる製法が一般に採
用されており、ここで、スリツトパターンとデイ
スク１の外周部との同軸度の制度を共に高めよう
とするとコストアツプを招くために、外周部の心
揺れはある程度許容されているのが通例である。 However, in such conventional rotary encoders, in order to form the slits 1A in the rotary slit disk 1, a manufacturing method is generally adopted in which a metal film is deposited on one side of the glass plate, leaving the slit portions. If an attempt is made to improve the coaxiality between the slit pattern and the outer circumference of the disk 1, the cost will increase, so it is customary to allow a certain degree of center wobbling in the outer circumference.
そこで、この外周部の心揺れによつて、デイス
ク１の回転中に発光素子４からの光が影響を受け
て変化することがあり、このために、発光出力が
変化していないにかかわらず、モニター用受光素
子部５Ｍでの受光量が変化してしまう。 Therefore, the light from the light emitting element 4 may be affected and change while the disk 1 is rotating due to this center fluctuation of the outer circumference, and for this reason, even though the light emission output does not change, The amount of light received by the monitor light receiving element section 5M changes.
また、回転機とスリツトデイスクおよび受光素
子との位置関係によつては、回転機のノイズが受
光素子に悪影響を及ぼす場合もあつた。 Further, depending on the positional relationship between the rotating machine, the slit disk, and the light receiving element, noise from the rotating machine may have an adverse effect on the light receiving element.
［目的］
本発明の目的は、上述した欠点を除去し、発光
素子の発光量を検出するモニター用受光素子を、
回転スリツトデイスクに対して発光素子と同一面
側の、この発光素子に隣接させた位置に配置し
て、発光素子からの光のうち回転スリツトデイス
クにより反射された光を受光するようになして、
発光素子からモニター用受光素子に受光される光
量が回転中の回転スリツトデイスクによるその外
周の心揺れによつて影響されることのないように
し、また回転機のノイズの受光素子に対する影響
を極力排するようにし、さらにはロータリエンコ
ーダを小型化することが可能な構成を有したロー
タリエンコーダを提供することにある。[Objective] The object of the present invention is to eliminate the above-mentioned drawbacks and to provide a monitoring light-receiving element for detecting the amount of light emitted from a light-emitting element.
The light emitting element is placed on the same side of the rotating slit disk as the light emitting element and adjacent to the light emitting element so as to receive the light reflected by the rotating slit disk out of the light from the light emitting element. hand,
The amount of light received by the monitor light receiving element from the light emitting element is not affected by the vibration of the outer periphery of the rotating slit disk during rotation, and the influence of noise from the rotating machine on the light receiving element is minimized. It is an object of the present invention to provide a rotary encoder having a configuration that allows the rotary encoder to be removed and further to be miniaturized.
［実施例］
以下に、図面に基づいて本発明を詳細に説明す
る。[Example] The present invention will be described in detail below based on the drawings.
第４図〜第６図は本発明の一実施例を示し、第
４図で６は回転機、７は回転機６のケースと一体
化されているエンコーダケースであり、このエン
コーダケース７に収納した回転スリツトデイスク
１に対して、デイスク１の下面側に面する位置
で、エンコーダケース７に発光素子４を、更にま
た発光素子４より回転軸２側のこれと隣接した位
置に発光素子４からの光のうち、デイスク１によ
つて反射された光のみを受光するようにしたモニ
ター用受光素子８を配設する。 4 to 6 show an embodiment of the present invention. In FIG. 4, 6 is a rotating machine, and 7 is an encoder case integrated with the case of the rotating machine 6, which is housed in the encoder case 7. A light emitting element 4 is attached to the encoder case 7 at a position facing the lower surface of the disk 1, and a light emitting element 4 is attached at a position adjacent to the rotating shaft 2 side of the light emitting element 4. A monitor light-receiving element 8 is arranged to receive only the light reflected by the disk 1 among the light from the disk 1.
いま、デイスク１が回転すると、発光素子４か
らの光はデイスク１のスリツト１Ａを介して固定
スリツト板３のスリツト３Ａ，３Ｂおよび３Ｃか
ら受光素子群５にそれぞれ受光されるが、本例で
は固定スリツト３Ａ，３Ｂおよび３Ｃの各対応し
た位置に第７図に示すように別個の受光素子５
Ａ，５Ｂおよび５Ｃが設けてあり、それぞれ独立
に受光している。また、これら受光素子５Ａ，５
Ｂおよび５Ｃは図示の如くデイスク１の上面側に
面する位置に配されている。 Now, when the disk 1 rotates, light from the light emitting element 4 is received by the light receiving element group 5 through the slit 1A of the fixed slit plate 3 through the slit 3A, 3B and 3C of the fixed slit plate 3. As shown in FIG. 7, separate light receiving elements 5 are provided at corresponding positions in the slits 3A, 3B and 3C.
A, 5B and 5C are provided, and each receives light independently. In addition, these light receiving elements 5A, 5
B and 5C are arranged at positions facing the upper surface side of the disk 1 as shown in the figure.
更にまた、同時に発光素子４からの光のうちデ
イスク１の裏面から反射された光がモニター用受
光素子８によつて受光されており、発光素子４か
らの発光出力の強弱を検知しているが、第４図に
示す９はこれらの発光素子４や受光素子５Ａ，５
Ｂおよび５Ｃ、更にモニター受光素子８に接続さ
れて回転機６を制御する回路であり、９Ａはその
外面に回路９が、また、内面に受光素子群５がそ
れぞれ配置されている両面プリント基板である。 Furthermore, at the same time, of the light emitted from the light emitting element 4, the light reflected from the back surface of the disk 1 is received by the monitoring light receiving element 8, and the strength of the light emission output from the light emitting element 4 is detected. , 9 shown in FIG. 4 indicates these light emitting elements 4 and light receiving elements 5A, 5.
B and 5C are circuits connected to the monitor light receiving element 8 to control the rotating machine 6, and 9A is a double-sided printed circuit board on which the circuit 9 is arranged on the outer surface and the light receiving element group 5 is arranged on the inner surface. be.
なお、ここで回転スリツトデイスク１に蒸着し
て形成されている金属膜（図示せず）は、一般に
クロームやアルミニウムの膜であり、したがつて
反射効率が非常に高く、その反射光でも十分な光
量が得られる。特にガラス板の場合は、その面が
良く研磨されており、平面精度も高く、光の乱反
射がない上に、回転時におけるデイスク１の面揺
れはエンコーダ出力信号の安定性を保持する上で
も低く保たれる必要があるので、そのように構成
されており、上記の反射光によつて発光素子４の
正確な発光量の検出が可能のことは以上の条件か
らしても明らかである。 Note that the metal film (not shown) deposited on the rotary slit disk 1 is generally a chrome or aluminum film, and therefore has very high reflection efficiency, and even the reflected light is sufficient. Amount of light can be obtained. In particular, in the case of a glass plate, the surface is well polished, the plane accuracy is high, there is no diffused reflection of light, and the surface fluctuation of disk 1 during rotation is low in order to maintain the stability of the encoder output signal. It is clear from the above conditions that it is possible to accurately detect the amount of light emitted from the light emitting element 4 using the reflected light.
次に、第７図によつて制御回路の構成の一例を
示す。すなわち、本例では受光素子５Ａ，５Ｂお
よび５Ｃからの受光信号を増幅器１０，１１およ
び１２の負の入力端子側にそれぞれ供給し、増幅
器１０，１１および１２から得られるエンコーダ
出力信号１４，１５および１６によつて回転機６
を制御する。 Next, an example of the configuration of the control circuit is shown in FIG. That is, in this example, the light receiving signals from the light receiving elements 5A, 5B and 5C are supplied to the negative input terminal sides of the amplifiers 10, 11 and 12, respectively, and the encoder output signals 14, 15 and 15 obtained from the amplifiers 10, 11 and 12 are Rotating machine 6 by 16
control.
また、モニター用受光素子８からの受光信号を
増幅器１３の負の入力端子側に供給し、増幅器１
３からのモニター出力信号によつて発光素子４に
流れる電流を制御し、その発光量を調節するが、
このために、増幅器１３からのモニター出力を抵
抗Ｒを介してトラジスタ１７のベースに供給する
ように構成する。 Further, the light reception signal from the monitor light receiving element 8 is supplied to the negative input terminal side of the amplifier 13,
The current flowing through the light emitting element 4 is controlled by the monitor output signal from the light emitting element 3, and the amount of light emitted is adjusted.
For this purpose, the monitor output from the amplifier 13 is configured to be supplied to the base of the transistor 17 via the resistor R.
すなわち、ここでは、ベース電位が負の電位に
保たれているので、モニター受光素子８に受光さ
れる光量が大きいと、絶対値の大きい負の電位と
なる。そこで、いま、発光素子４の発光能力が低
下してその出力が下がると、モニター受光素子８
での受光量が減少するので、ベース電位は上が
り、トランジスタ１７におけるベースとエミツタ
間の電圧−VOPが大きく発光素子４に供給される
電流が増加して、その発光量が増強される。 That is, here, since the base potential is kept at a negative potential, when the amount of light received by the monitor light receiving element 8 is large, the potential becomes a negative potential with a large absolute value. Therefore, if the light emitting ability of the light emitting element 4 decreases and its output decreases, the monitor light receiving element 8
Since the amount of light received at the transistor 17 decreases, the base potential increases, the voltage between the base and the emitter of the transistor 17 -V OP increases, and the current supplied to the light emitting element 4 increases, thereby enhancing the amount of light emitted.
また、発光素子４の発光能力が高まり過ぎる
と、モニター受光素子８での受光量が増大するこ
とによつてベース電位が低下し、ベースとエミツ
タ間の電圧−VOPが小さくなつて、発光素子４の
発光量が抑制される。 Furthermore, if the light emitting ability of the light emitting element 4 increases too much, the amount of light received by the monitor light receiving element 8 increases, causing the base potential to drop, and the voltage between the base and the emitter -V OP to decrease, causing the light emitting element to 4 is suppressed.
［効果］
以上説明してきたように、本発明のロータリエ
ンコーダは、回転機の軸によつて回転する回転ス
リツトデイスクと、前記回転スリツトデイスクの
一面に面した制御手段を配置した基板上に配置さ
れる受光素子と、前記回転スリツトデイスクの他
面と前記回転機との間に設けられ前記受光素子に
向けて光を発光する発光素子と、前記回転スリツ
トデイスクと前記回転機との間に設けられ、前記
発光素子と前記回転機の軸との間に配置され、前
記発光素子からの光のうち前記回転スリツトデイ
スクの内径側の平坦なデイスク反射面により反射
された光を受光するようにしたモニタ用受光素子
と、前記モニタ用受光素子からの出力に応じて前
記発光素子の発光量を制御する手段とを有するの
で、モニタ用受光素子に入射する光に対する回転
スリツトデイスクの外周部の心揺れによる影響を
排除し、また、発光素子から発した光のうち回転
スリツトデイスクの内径側の平坦なデイスク反射
面で反射された光をモニタ用受光素子に入射させ
ることができる。これにより、モニター用受光素
子による発光素子の発光出力の変化の補償を安定
してかつ精度良く行うことができ、発光素子に適
正な発光量を常に維持させることのできる信頼度
の高いロータリエンゴーダを提供することができ
る。[Effects] As explained above, the rotary encoder of the present invention has a rotary slit disk rotated by the shaft of a rotating machine, and a substrate on which a control means facing one surface of the rotary slit disk is arranged. a light receiving element arranged between the rotating slit disk and the rotating machine; a light emitting element disposed between the other surface of the rotating slit disk and the rotating machine and emitting light toward the light receiving element; and a light emitting element arranged between the rotating slit disk and the rotating machine. The light emitting element is disposed between the light emitting element and the shaft of the rotating machine, and receives light from the light emitting element that is reflected by a flat disk reflecting surface on the inner diameter side of the rotating slit disk. Since the monitor light-receiving element has a monitor light-receiving element and a means for controlling the amount of light emitted from the light-emitting element according to the output from the monitor light-receiving element, It is possible to eliminate the influence of heart vibration on the outer periphery, and also to allow the light emitted from the light emitting element that is reflected by the flat disk reflective surface on the inner diameter side of the rotating slit disk to be incident on the monitoring light receiving element. . This makes it possible to stably and accurately compensate for changes in the light emitting output of the light emitting element caused by the monitoring light receiving element, and is a highly reliable rotary engoder that can always maintain the appropriate amount of light emitted from the light emitting element. can be provided.
また、受光素子をデイスクに対して回転機とは
反対側に設けたので回転機からのノイズの影響を
極力排することができる。 Furthermore, since the light receiving element is provided on the opposite side of the disk from the rotating machine, the influence of noise from the rotating machine can be eliminated as much as possible.
さらに、このような配置やモニタ用受光素子の
配置によつてエンコーダそのものを小型化するこ
とも可能となる。 Furthermore, by such an arrangement and the arrangement of the monitoring light receiving element, it is possible to downsize the encoder itself.
第１図は従来の光学式ロータリエンコーダの構
成の概要を一例として示す側面図、第２図はその
スリツトデイスクを下面側から見た平面図、第３
図はその固定スリツト板および受光素子を下面側
から見た平面図、第４図は本発明ロータリエンコ
ーダの構成の一例を示す部分断面図、第５図はそ
のスリツトデイスクを下面側から見た平面図、第
６図はその固定スリツト板および受光素子を下面
側から見た平面図、第７図は本発明ロータリエン
コーダの駆動回路の一例を示す構成図である。
１……回転スリツトデイスク、１Ａ，１Ｂ……
スリツト、２……回転軸、３……固定スリツト
板、３Ａ，３Ｂ，３Ｃ……スリツト、４……発光
素子、５，５Ａ，５Ｂ，５Ｃ……受光素子、５Ｍ
……受光素子部、６……回転機、７……エンコー
ダケース、８……モニター用受光素子、９……回
路、９Ａ……両面プリント基板、１０，１１，１
２，１３……増幅器、１７……トランジスタ。
Fig. 1 is a side view showing an outline of the configuration of a conventional optical rotary encoder as an example, Fig. 2 is a plan view of the slit disk viewed from the bottom side, and Fig. 3
The figure is a plan view of the fixed slit plate and the light receiving element viewed from the bottom side, Figure 4 is a partial sectional view showing an example of the configuration of the rotary encoder of the present invention, and Figure 5 is the slit disk viewed from the bottom side. FIG. 6 is a plan view of the fixed slit plate and the light-receiving element viewed from below, and FIG. 7 is a configuration diagram showing an example of the drive circuit of the rotary encoder of the present invention. 1... Rotating slit disk, 1A, 1B...
Slit, 2... Rotating shaft, 3... Fixed slit plate, 3A, 3B, 3C... Slit, 4... Light emitting element, 5, 5A, 5B, 5C... Light receiving element, 5M
... Light receiving element section, 6 ... Rotating machine, 7 ... Encoder case, 8 ... Light receiving element for monitor, 9 ... Circuit, 9A ... Double-sided printed circuit board, 10, 11, 1
2, 13...Amplifier, 17...Transistor.
Claims (1)
イスクと、 前記回転スリツトデイスクの一面に面した制御
手段を配置した基板上に配置される受光素子と、 前記回転スリツトデイスクの他面と前記回転機
との間に設けられ前記受光素子に向けて光を発光
する発光素子と、 前記回転スリツトデイスクと前記回転機との間
に設けられ、前記発光素子と前記回転機の軸との
間に配置され、前記発光素子からの光のうち前記
回転スリツトデイスクの内径側の平坦なデイスク
反射面により反射された光を受光するようにした
モニタ用受光素子と、 前記モニタ用受光素子からの出力に応じて前記
発光素子の発光量を制御する手段とを有すること
を特徴とするロータリエンコーダ。[Scope of Claims] 1. A rotating slit disk rotated by the shaft of a rotating machine; a light receiving element disposed on a substrate facing one surface of the rotating slit disk and having a control means disposed thereon; and the rotating slit disk. a light emitting element provided between the other surface of the slit disk and the rotating machine and emitting light toward the light receiving element; and a light emitting element provided between the rotating slit disk and the rotating machine, the light emitting element and the a monitor light-receiving element disposed between the shaft of the rotating machine and configured to receive light reflected by a flat disk reflecting surface on the inner diameter side of the rotating slit disk out of the light from the light-emitting element; A rotary encoder comprising means for controlling the amount of light emitted from the light emitting element according to the output from the monitor light receiving element.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58196179A JPS6089711A (en) | 1983-10-21 | 1983-10-21 | Rotary encoder |
| US06/661,822 US4712000A (en) | 1983-10-21 | 1984-10-17 | Rotary encoder with source-adjacent light sampling and control |
| DE19843438461 DE3438461A1 (en) | 1983-10-21 | 1984-10-19 | ROTATING ENCODER |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58196179A JPS6089711A (en) | 1983-10-21 | 1983-10-21 | Rotary encoder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6089711A JPS6089711A (en) | 1985-05-20 |
| JPH0472169B2 true JPH0472169B2 (en) | 1992-11-17 |
Family
ID=16353510
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58196179A Granted JPS6089711A (en) | 1983-10-21 | 1983-10-21 | Rotary encoder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6089711A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62128615A (en) * | 1985-11-29 | 1987-06-10 | Canon Inc | Optical encoder |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50113250A (en) * | 1974-02-14 | 1975-09-05 | ||
| JPS557649A (en) * | 1978-07-04 | 1980-01-19 | Canon Inc | Photo encoder |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5097449U (en) * | 1973-12-20 | 1975-08-14 | ||
| JPS54178544U (en) * | 1978-06-06 | 1979-12-17 | ||
| JPS6020006Y2 (en) * | 1979-06-14 | 1985-06-15 | 多摩川精機株式会社 | optical shaft encoder |
| JPS57190417U (en) * | 1981-05-28 | 1982-12-02 |
-
1983
- 1983-10-21 JP JP58196179A patent/JPS6089711A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50113250A (en) * | 1974-02-14 | 1975-09-05 | ||
| JPS557649A (en) * | 1978-07-04 | 1980-01-19 | Canon Inc | Photo encoder |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6089711A (en) | 1985-05-20 |
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