JP5096887B2 - Rotary encoder - Google Patents
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本発明は、アブソリュート型やインクリメンタル型のロータリエンコーダに関するものである。本発明のロータリエンコーダは、円周方向複数の回転スリットを設けた回転スリット板に対して固定スリットを介して投光素子から光を当てて上記両スリットを通過した光信号を受光素子で受光し、この受光に応答して受光素子から出力される信号から回転情報を得るエンコーダである。 The present invention relates to an absolute type or incremental type rotary encoder. The rotary encoder of the present invention applies light from a light projecting element to a rotating slit plate provided with a plurality of rotating slits in the circumferential direction via a fixed slit, and receives a light signal that has passed through both slits by the light receiving element. The encoder obtains the rotation information from the signal output from the light receiving element in response to the light reception.
図５、図６を参照して、ロータリエンコーダＲＥは、一般的に、投光素子ＬＥＤと２つの受光素子ＰＤ１，ＰＤ２との間に、円周方向等間隔に投光素子ＬＥＤからの光を透過することができる複数のスリット（以下回転スリットと言う）を有する回転スリット板ＲＳと、この回転スリット板ＲＳの一方側に上記スリットと同様に投光素子ＬＥＤからの光を透過することができるスリット（以下固定スリットと言う）を有する固定スリット板ＦＳとを対向配置している（特許文献１）。 Referring to FIGS. 5 and 6, the rotary encoder RE generally emits light from the light projecting element LED at equal intervals in the circumferential direction between the light projecting element LED and the two light receiving elements PD1 and PD2. A rotating slit plate RS having a plurality of slits (hereinafter referred to as rotating slits) that can transmit, and light from the light projecting element LED can be transmitted to one side of the rotating slit plate RS in the same manner as the slits. A fixed slit plate FS having a slit (hereinafter referred to as “fixed slit”) is disposed oppositely (Patent Document 1).
この固定スリット板ＦＳの固定スリットは、投光素子ＬＥＤからの光を電気角で順次９０度ずつずれさせて回転スリット板ＲＳの回転スリットを通過させて光信号を形成するようになっている。受光素子ＰＤ１，ＰＤ２では上記光信号を受光し、それぞれ比較回路ＣＰ１，ＣＰ２で受光素子ＰＤ１，ＰＤ２の受光出力の出力レベルを基準レベルと比較して図７（ａ）（ｂ）で示すようなＡ相信号と、Ｂ相信号とを生成し、これらＡ相とＢ相信号から被検出軸の回転状態すなわちその回転方向や回転速度を検出することができるようになっている。 The fixed slit of the fixed slit plate FS shifts the light from the light projecting element LED by 90 degrees sequentially in electrical angle and passes through the rotary slit of the rotary slit plate RS to form an optical signal. The light receiving elements PD1 and PD2 receive the optical signal, and the comparison circuits CP1 and CP2 respectively compare the output levels of the light receiving outputs of the light receiving elements PD1 and PD2 with the reference level as shown in FIGS. An A-phase signal and a B-phase signal are generated, and the rotation state of the detected shaft, that is, the rotation direction and the rotation speed can be detected from the A-phase and B-phase signals.
この回転方向の検出では、図７（ｃ）で示すようにＡ相とＢ相信号のバイナリーコードでＡ相信号「０」、Ｂ相信号「０」の組み合わせでは「０」、Ａ相信号「１」、Ｂ相信号「０」の組み合わせでは「２」、Ａ相信号「１」、Ｂ相信号「１」の組み合わせでは「３」、Ａ相信号「０」、Ｂ相信号「１」の組み合わせでは「１」としそのバイナリーコードの変化順序から回転方向を判定することができる。バイナリーコードは「０」「２」「３」「１」「０」「２」…と変化し、信号レベル合計は「０」「１」「２」「１」「０」「１」…と変化する。 In the detection of the rotation direction, as shown in FIG. 7C, the binary code of the A phase and B phase signals is “0” for the combination of the A phase signal “0” and the B phase signal “0”, and the A phase signal “ 1 ”, B phase signal“ 0 ”in combination“ 2 ”, A phase signal“ 1 ”, B phase signal“ 1 ”in combination“ 3 ”, A phase signal“ 0 ”, B phase signal“ 1 ” The combination is “1”, and the rotation direction can be determined from the change order of the binary code. The binary code changes as “0” “2” “3” “1” “0” “2”... And the total signal level is “0” “1” “2” “1” “0” “1”. Change.
そして、上記Ａ相信号とＢ相信号のバイナリーコードの組み合わせでは「０」「０」の組み合わせが存在している。この場合、上記ロータリエンコーダでは受光素子ＰＤ１，ＰＤ２が電源コモン端子ＣＴに共通に接続されているために、電源コモン端子ＣＴが受光素子ＰＤ１，ＰＤ２に未接続であるときも上記Ａ相信号とＢ相信号のバイナリーコードの組み合わせでは「０」「０」の組み合わせが成立することになる。受光素子ＰＤ１，ＰＤ２の受光出力はそれぞれ比較回路ＣＰ１，ＣＰ２で比較され、Ａ相信号、Ｂ相信号が生成されるようになっている。 In the combination of the binary code of the A phase signal and the B phase signal, there are “0” and “0” combinations. In this case, since the light receiving elements PD1 and PD2 are commonly connected to the power supply common terminal CT in the rotary encoder, the A-phase signal and the B signal are output even when the power common terminal CT is not connected to the light receiving elements PD1 and PD2. In the combination of the binary codes of the phase signals, the combination of “0” and “0” is established. The light reception outputs of the light receiving elements PD1 and PD2 are compared by the comparison circuits CP1 and CP2, respectively, and an A phase signal and a B phase signal are generated.
そのため従来のロータリエンコーダＲＥでは、受光素子ＰＤ１，ＰＤ２が電源コモン端子ＣＴに未接続の場合では、被検出軸の回転状態を誤検出することになり、ロータリエンコーダを搭載した装置やシステムの信頼性を低下させてしまう要因となるという課題がある。 Therefore, in the conventional rotary encoder RE, when the light receiving elements PD1 and PD2 are not connected to the power supply common terminal CT, the rotation state of the detected shaft is erroneously detected, and the reliability of the apparatus or system on which the rotary encoder is mounted is improved. There is a problem that it becomes a factor of lowering.
一方、受光素子ＰＤ１，ＰＤ２が電源コモン端子ＣＴに接続されているか否かの判定を行うにあたり、例えば比較回路ＣＰ１，ＣＰ２の出力であるＡ相信号、Ｂ相信号を用いると、これら比較回路ＣＰ１，ＣＰ２が故障している場合には、受光素子ＰＤ１，ＰＤ２が電源コモン端子ＣＴに接続されているにもかかわらずＡ相信号とＢ相信号のバイナリーコードの組み合わせでは「０」「０」の組み合わせが成立して電源コモン端子ＣＴの接続状態に関する上記判定を誤判定する可能性が存在する。 On the other hand, in determining whether or not the light receiving elements PD1 and PD2 are connected to the power supply common terminal CT, for example, when the A-phase signal and the B-phase signal output from the comparison circuits CP1 and CP2 are used, these comparison circuits CP1. , CP2 is faulty, the combination of the binary code of the A phase signal and the B phase signal is “0” or “0” even though the light receiving elements PD1 and PD2 are connected to the power supply common terminal CT. There is a possibility that the above determination regarding the connection state of the power supply common terminal CT is erroneously determined due to the combination.
さらには受光素子ＰＤ１，ＰＤ２自体が故障して異常な場合にもＡ相信号とＢ相信号のバイナリーコードの組み合わせでは「０」「０」の組み合わせが成立して電源コモン端子ＣＴの接続状態に関する上記判定を誤判定する可能性が存在する。
したがって、本発明により解決すべき課題は、複数の受光素子が電源コモン端子に共通に接続されているロータリエンコーダにおいて、電源コモン端子に対する複数の受光素子の接続状態の判定に対してその誤判定を確実に無くし、正確に行うことを検出可能とすることである。 Therefore, the problem to be solved by the present invention is that in a rotary encoder in which a plurality of light receiving elements are commonly connected to the power supply common terminal, the erroneous determination is made with respect to the determination of the connection state of the plurality of light receiving elements with respect to the power supply common terminal. It is to ensure that it is possible to detect exactly what is to be done.
本発明によるロータリエンコーダは、投光素子の投光を回転スリットを介して受光して１８０度ごとに反転し互いに１８０度位相が相違する２つの第１、第２受光出力を生成する一対のＡ相信号生成用受光素子と、上記２つの第１、第２受光出力それぞれと９０度位相がずれ１８０度ごとに反転し互いに１８０度位相が相違する２つの第３、第４受光出力を生成する一対のＢ相信号生成用受光素子と、を備えたロータリエンコーダにおいて、一対のＡ相信号生成用受光素子の受光出力からＡ相信号、一対のＢ相信号生成用受光素子の受光出力からＢ相信号を生成する相信号生成回路と、上記受光出力のうち任意の３つの受光出力の受光出力をレベル加算する加算部と、上記加算レベルが、１つの受光出力の最大レベルと２つの受光出力の合計最大レベルとの範囲内であるときは受光素子が正常でかつ電源コモン端子が上記受光素子に接続されていると判定し、上記加算レベルが０でないが上記範囲外であるときは受光素子が異常でかつ電源コモン端子が上記受光素子に接続されていると判定し、上記加算レベルが０であるときは電源コモン端子が上記受光素子に未接続であると判定する判定部と、を備えたことを特徴とするものである。 The rotary encoder according to the present invention receives a light projection of a light projecting element through a rotary slit, and inverts every 180 degrees to generate two first and second light receiving outputs that are 180 degrees out of phase with each other. The phase signal generating light receiving element and the two first and second light receiving outputs are shifted by 90 degrees and inverted every 180 degrees to generate two third and fourth light receiving outputs that are 180 degrees out of phase with each other. In a rotary encoder provided with a pair of light receiving elements for generating a B phase signal, a light receiving output of a pair of light receiving elements for generating an A phase signal is an A phase signal, and a light receiving output of a pair of light receiving elements for generating a B phase signal is a B phase. A phase signal generation circuit for generating a signal, an adder for adding the levels of light reception outputs of any three light reception outputs among the light reception outputs, and the addition level of the maximum level of one light reception output and two light reception outputs. total When it is within the range of the large level, it is determined that the light receiving element is normal and the power supply common terminal is connected to the light receiving element. When the addition level is not 0 but outside the above range, the light receiving element is abnormal. And a determination unit that determines that the power supply common terminal is connected to the light receiving element and determines that the power supply common terminal is not connected to the light receiving element when the addition level is 0. It is characterized by.
上記加算部と判定部はマイクロコンピュータで構成してもよいし、ロジック回路で構成してもよい。 The addition unit and determination unit may be configured by a microcomputer or a logic circuit.
本発明では、判定部により３つの受光出力の受光出力レベルの加算レベルが０か否かにより受光素子が電源コモン端子に未接続か接続かの判定を行うので、Ａ、Ｂ相両信号の信号レベルの組み合わせで「００」の場合が存在していても、上記判定により被検出軸の回転状態を検出することができ、ロータリエンコーダを搭載した装置やシステムの信頼性を向上することができる。 In the present invention, the determination unit determines whether the light receiving element is not connected to the power supply common terminal or not depending on whether the addition level of the light reception output levels of the three light reception outputs is 0 or not. Even if the level combination is “00”, the rotation state of the detected shaft can be detected by the above determination, and the reliability of the apparatus or system on which the rotary encoder is mounted can be improved.
この場合、電源コモン端子が受光素子に接続されているか否かの判定を、比較回路等の信号処理回路の出力であるＡ相信号、Ｂ相信号を用いないので、これら信号処理回路が故障している場合での電源コモン端子接続状態の判定を誤判定する可能性が無い。 In this case, since the A-phase signal and the B-phase signal that are the outputs of the signal processing circuit such as the comparison circuit are not used to determine whether or not the power supply common terminal is connected to the light receiving element, these signal processing circuits fail. There is no possibility of misjudging the judgment of the connection state of the power supply common terminal.
また、受光素子自体が故障して異常な場合には加算レベルが０でないが所定範囲外であるという判定からその異常の判定ができるので電源コモン端子に受光素子が共通に接続されているか否かの誤判定を行う可能性が無い。 Also, if the light receiving element itself is faulty and abnormal, it can be determined from the determination that the addition level is not 0 but outside the predetermined range, so whether or not the light receiving element is commonly connected to the power supply common terminal. There is no possibility of misjudgment.
なお、本発明は、アブソリュート型のロータリエンコーダでもインクリメンタル型のロータリエンコーダにも適用することができる。 The present invention can be applied to both an absolute type rotary encoder and an incremental type rotary encoder.
本発明の方法では、受光素子のいずれかが電源コモン端子に未接続状態であることを確実に判定することができる。したがって、この方法を採用したロータリエンコーダを搭載した装置やシステムの信頼性を向上させることができる。 According to the method of the present invention, it is possible to reliably determine that one of the light receiving elements is not connected to the power supply common terminal. Therefore, it is possible to improve the reliability of an apparatus or system equipped with a rotary encoder that employs this method.
以下、添付した図面を参照して、本発明の実施の形態に係る方法を詳細に説明する。実施の形態に係る方法が適用されるロータリエンコーダの基本構成は図５、図６と同様である。 Hereinafter, a method according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The basic configuration of the rotary encoder to which the method according to the embodiment is applied is the same as that shown in FIGS.
図１を参照して、投光素子ＬＥＤは電源と接地との間に電流制限抵抗Ｒ０、トランジスタＴＲ０と共に直列に挿入接続され図示略の駆動回路出力でオンオフするトランジスタＴＲ０を通じて投光動作する。投光素子ＬＥＤからの投光を略示した回転スリット板ＲＳと、固定スリット板ＦＳとを介してＡ相信号生成用の一対の受光素子ＰＤ（ａ+），ＰＤ（ａ-）と，Ｂ相信号生成用の一対の受光素子ＰＤ（ｂ+），ＰＤ（ｂ-）と、で受光する。 Referring to FIG. 1, the light projecting element LED performs a light projecting operation through a transistor TR0 that is inserted and connected in series with a current limiting resistor R0 and a transistor TR0 between a power source and the ground, and is turned on and off with a drive circuit output (not shown). A pair of light receiving elements PD (a + ), PD (a − ) for generating an A phase signal via a rotating slit plate RS schematically showing light projection from the light projecting element LED and a fixed slit plate FS, B Light is received by a pair of light receiving elements PD (b + ) and PD (b − ) for generating a phase signal.
Ａ相信号生成用の一対の受光素子ＰＤ（ａ+），ＰＤ（ａ-）それぞれの第１、第２受光出力（ａ+）（ａ-）と、Ｂ相信号生成用の一対の受光素子ＰＤ（ｂ+），ＰＤ（ｂ-）それぞれの第３、第４受光出力（ｂ+）（ｂ-）は比較回路ＣＰ１，ＣＰ２で比較され、比較回路ＣＰ１から１８０度ごとに反転するＡ相信号、比較回路ＣＰ２からはＡ相信号から９０度ずれ１８０度ごとに反転するＢ相信号が出力される。
First and second light receiving outputs (a + ) (a − ) of a pair of light receiving elements PD (a + ) and PD (a − ) for generating an A phase signal, and a pair of light receiving elements for generating a B phase signal The third and fourth light receiving outputs (b + ) and (b − ) of PD (b + ) and PD (b − ) are compared by the
上記各受光素子ＰＤ（ａ+），ＰＤ（ａ-），ＰＤ（ｂ+），ＰＤ（ｂ-）のうち任意３つの受光素子ＰＤ（ａ+），ＰＤ（ｂ+），ＰＤ（ｂ-）それぞれの受光出力（ａ+），（ｂ+），（ｂ-）と、受光素子ＰＤ（ａ-），ＰＤ（ｂ+），ＰＤ（ｂ-）それぞれの受光出力（ａ-），（ｂ+），（ｂ-）とをマイクロコンピュータまたはロジック回路で構成された第１、第２加算部ＡＤＤ１，ＡＤＤ２で加算される。この場合、加算部の数は、上記に限定されない。なお、以下の説明では説明の簡略のため第１加算部ＡＤＤ１について説明し第２加算部ＡＤＤ２の説明は略する。
Of the light receiving elements PD (a + ), PD (a − ), PD (b + ), and PD (b − ), any three light receiving elements PD (a + ), PD (b + ), and PD (b − ) ) each receiving the output (a +), (b + ), (b -) and the light receiving element PD (a -), PD ( b +), PD (b -) each receiving the output (a -), ( b + ) and (b − ) are added by the first and
この第１加算部ＡＤＤ１により加算された加算レベル〔（ａ+）＋（ｂ+）＋（ｂ-）〕、は、マイクロコンピュータまたはロジック回路で構成された判定部ＪＧに与えられる。判定部ＪＧは上記３つの受光出力（ａ+），（ｂ+），（ｂ-）の加算レベル〔（ａ+）＋（ｂ+）＋（ｂ-）〕により電源コモン端子ＣＴが受光素子ＰＤ（ａ+），ＰＤ（ａ-），ＰＤ（ｂ+），ＰＤ（ｂ-）に未接続であるか否かを判定することができるようになっている。 The addition level [(a + ) + (b + ) + (b − )] added by the first addition unit ADD1 is given to the determination unit JG constituted by a microcomputer or a logic circuit. The determination unit JG determines whether the power supply common terminal CT is a light receiving element according to the addition level [(a + ) + (b + ) + (b − )] of the above three light receiving outputs (a + ), (b + ), and (b − ). It is possible to determine whether or not PD (a + ), PD (a − ), PD (b + ), and PD (b − ) are not connected.
以上のロータリエンコーダでは、投光素子ＬＥＤ、回転スリットｒｓ、固定スリットｆｓ、受光素子ＰＤ（ａ+），ＰＤ（ａ-），ＰＤ（ｂ+），ＰＤ（ｂ-）、比較回路ＣＰ１，ＣＰ２により、１８０度ごとに信号レベルが反転するＡ相信号と、Ａ相より電気角で９０度位相がずれて１８０度ごとに信号レベルが反転するＢ相信号とを生成する相信号生成手段、を構成する。 In the above rotary encoder, the light projecting element LED, the rotating slit rs, the fixed slit fs, the light receiving elements PD (a + ), PD (a − ), PD (b + ), PD (b − ), comparison circuits CP1 and CP2 Phase signal generating means for generating an A-phase signal whose signal level is inverted every 180 degrees and a B-phase signal whose phase is shifted by 90 degrees in electrical angle from the A phase and whose signal level is inverted every 180 degrees. Constitute.
図２を参照して、ｒｓは回転スリット板ＲＳに円周方向等間隔に形成された回転スリットである。図中、回転スリット板ＲＳにおいて、回転スリットｒｓの部分は図解上は白抜きで、回転スリットｒｓ間は投光素子ＬＥＤの投光を遮光する部分であり、図解上はハッチングで示す。固定スリット板ＦＳはこの回転スリットｒｓに対向する固定スリットｆｓを有する。 With reference to FIG. 2, rs are rotating slits formed in the rotating slit plate RS at equal intervals in the circumferential direction. In the drawing, in the rotary slit plate RS, the portion of the rotary slit rs is white in the illustration, and the portion between the rotary slits rs is a portion that blocks light projection of the light projecting element LED, and is indicated by hatching in the illustration. The fixed slit plate FS has a fixed slit fs opposed to the rotating slit rs.
固定スリットｆｓは説明の都合で、投光素子ＬＥＤの光を１８０度ごとに反転する光信号ａ+を生成する固定スリットをｆｓ（ａ+）、光信号ａ+に対して電気角で１８０度ずれて１８０度ごとに反転する光信号ａ-を生成する固定スリットをｆｓ（ａ-）、投光素子ＬＥＤの光を光信号ａ+に電気角で９０度ずれ１８０度ごとに反転する光信号ｂ+を生成する固定スリットをｆｓ（ｂ+）、光信号ｂ+に対して電気角で１８０度ずれて１８０度ごとに反転する光信号ｂ-を生成する固定スリットをｆｓ（ｂ-）、と称する。 For convenience of explanation, the fixed slit fs is fs (a + ) that generates an optical signal a + that inverts the light of the light emitting element LED every 180 degrees, and the electrical angle is 180 degrees with respect to the optical signal a + . The fixed slit that generates the optical signal a − that is shifted and inverted every 180 degrees is fs (a − ), and the light of the light emitting element LED is shifted to the optical signal a + by an electrical angle of 90 degrees and inverted every 180 degrees. The fixed slit for generating b + is fs (b + ), the fixed slit for generating the optical signal b − that is shifted by 180 degrees in electrical angle with respect to the optical signal b + and inverted every 180 degrees, fs (b − ), Called.
受光素子ＰＤもそれぞれの固定スリットｆｓ（ａ+），ｆｓ（ａ-），ｆｓ（ｂ+），ｆｓ（ｂ-）それぞれに合わせて、ＰＤ（ａ+），ＰＤ（ａ-），ＰＤ（ｂ+），ＰＤ（ｂ-）と称しており、それぞれの受光素子ＰＤ（ａ+），ＰＤ（ａ-），ＰＤ（ｂ+），ＰＤ（ｂ-）は、対応する固定スリットｆｓ（ａ+）、ｆｓ（ａ-）、ｆｓ（ｂ+）、ｆｓ（ｂ-）を通過した光信号ａ+，ａ-，ｂ+，ｂ-を受光する。光信号ａ+、ａ-をそれぞれ受光した受光素子ＰＤ（ａ+）とＰＤ（ａ-）それぞれの出力（ａ+）、（ａ-）は上記したように比較回路ＣＰ１で比較されてＡ相信号が生成され、光信号ｂ+、ｂ-をそれぞれ受光した受光素子ＰＤ（ｂ+）とＰＤ（ｂ-）それぞれの出力（ｂ+），（ｂ-）は上記したように比較回路ＣＰ２で比較されてＢ相信号が生成される。 The light receiving element PD also has PD (a + ), PD (a − ), and PD (a) according to the respective fixed slits fs (a + ), fs (a − ), fs (b + ), and fs (b − ). b + ) and PD (b − ), and the respective light receiving elements PD (a + ), PD (a − ), PD (b + ), and PD (b − ) correspond to the corresponding fixed slits fs (a + ), Fs (a − ), fs (b + ), and optical signals a + , a − , b + and b − that have passed through fs (b − ) are received. The outputs (a + ) and (a − ) of the light receiving elements PD (a + ) and PD (a − ) that receive the optical signals a + and a − , respectively, are compared by the comparison circuit CP1 as described above and the A phase. As described above, the outputs (b + ) and (b − ) of the light receiving elements PD (b + ) and PD (b − ), which receive the optical signals b + and b − , are generated by the comparison circuit CP2 as described above. The B phase signal is generated by comparison.
図３を参照してａ+は受光素子ＰＤ（ａ+）の受光出力（ａ+）の波形、ｂ+は受光素子ＰＤ（ｂ+）の受光出力（ｂ+）の波形、ｂ-は受光素子ＰＤ（ｂ-）の受光出力（ｂ-）の波形、ａ+＋ｂ+＋ｂ-は、上記波形ａ+＋波形ｂ+＋波形ｂ-の加算波形を示す。波形ａ+、ｂ+、ｂ-はそれぞれ１８０度ごとに反転する出力であり、出力レベル０．５を中心にしてレベル０−１の間を正弦波状に変化する。ただし、受光素子ＰＤ（ｂ+）の受光出力（ｂ+）は受光出力（ａ+）から９０度位相がずれ１８０度ごとに反転する出力であり、受光素子（ｂ-）の受光出力（ｂ-）は、受光出力（ｂ+）から１８０度位相ずれし１８０度ごとに反転する出力である。
Referring to FIG. 3, a + is a waveform of a light receiving output (a + ) of the light receiving element PD (a + ), b + is a waveform of a light receiving output (b + ) of the light receiving element PD (b + ), and b − is a light receiving light. The light reception output (b − ) waveform of the element PD (b − ), a + + b + + b −, indicates the addition waveform of the waveform a + + waveform b + + waveform b − . Waveforms a + , b + , and b − are outputs that are inverted every 180 degrees, and change between
上記加算波形ａ+＋ｂ+＋ｂ-はレベル１．５を中心にしてレベル１−２の間を正弦波状に変化し、このレベルが第１加算部ＡＤＤ１の加算レベルである。 The addition waveform a + + b + + b − changes in a sinusoidal shape between level 1-2 with the level 1.5 as the center, and this level is the addition level of the first addition unit ADD1.
図４を参照して、判定部ＪＧは、判定スタートして、第１加算部ＡＤＤ１による加算レベルが、下限レベルが１つの受光出力の最大レベル「１」で上限レベルが２つの受光出力の合計最大レベル「２」である所定範囲内であるか否かを判定する（ステップｎ１）。 Referring to FIG. 4, determination unit JG starts determination, and the addition level by first addition unit ADD1 is the sum of the light reception outputs whose lower limit level is the maximum level “1” of one light reception output and whose upper limit level is two. It is determined whether or not it is within a predetermined range of the maximum level “2” (step n1).
判定部ＪＧは、加算レベルが上記所定範囲内のときはステップｎ１でＹＥＳと判定し、受光素子が正常でかつ上記受光素子が電源コモン端子ＣＴに共通に接続されていると判定し（ステップｎ２）、加算レベルが上記所定範囲外のときはステップｎ１でＮＯと判定し、加算レベルが０であるか否かを判定する（ステップｎ３）。加算レベルが０であるときはステップｎ３で「＝０」と判定し上記受光素子が電源コモン端子ＣＴに未接続であると判定し（ステップｎ４）、加算レベルが０でないときはステップｎ３で「≠０」と判定しいずれかの受光素子が異常であるが受光素子が電源コモン端子ＣＴに共通に接続されていると判定する（ステップｎ５）。 When the addition level is within the predetermined range, the determination unit JG determines YES in step n1, and determines that the light receiving element is normal and the light receiving element is commonly connected to the power supply common terminal CT (step n2). When the addition level is outside the predetermined range, NO is determined in step n1, and it is determined whether or not the addition level is 0 (step n3). When the addition level is 0, it is determined at step n3 that “= 0” and it is determined that the light receiving element is not connected to the power supply common terminal CT (step n4). When the addition level is not 0, at step n3, “ ≠ 0 ”and it is determined that one of the light receiving elements is abnormal but the light receiving element is commonly connected to the power supply common terminal CT (step n5).
なお、第２加算部ＡＤＤ２による加算レベルに関しては、第１加算部ＡＤＤ１と同様に判定部ＪＧで上記と同様の判定を行うことができる。 Note that the addition level by the second addition unit ADD2 can be determined by the determination unit JG in the same manner as described above, similarly to the first addition unit ADD1.
なお、受光素子が電源コモン端子ＣＴに共通に接続されているか否かの判定は、第１加算部ＡＤＤ１または第２加算部ＡＤＤ２のいずれか一方の加算レベルから判定することができる。 Whether or not the light receiving elements are commonly connected to the power supply common terminal CT can be determined from the addition level of either the first addition unit ADD1 or the second addition unit ADD2.
また、受光素子の異常に関しては、上記第１、第２加算部ＡＤＤ１，ＡＤＤ２により４つの受光素子ＰＤ（ａ+），ＰＤ（ａ-），ＰＤ（ｂ+），ＰＤ（ｂ-）すべての異常か否かの判定を行うことができる。 Regarding the abnormality of the light receiving element, all of the four light receiving elements PD (a + ), PD (a − ), PD (b + ), and PD (b − ) are detected by the first and second adders ADD1 and ADD2. It is possible to determine whether or not there is an abnormality.
以上のように実施の形態では、受光素子が電源コモン端子ＣＴに未接続状態であると判定することができ、結果、実施の形態のロータリエンコーダではそれを搭載した装置やシステムの信頼性が向上することになる。 As described above, in the embodiment, it can be determined that the light receiving element is not connected to the power supply common terminal CT. As a result, the rotary encoder according to the embodiment improves the reliability of the device or system in which the light receiving element is mounted. Will do.
ＲＳ 回転スリット板
ＦＳ 固定スリット板
ＬＥＤ 投光素子
ＰＤ 受光素子
ＡＤＤ 加算回路
ＪＧ 判定回路
ＣＴ 電源コモン端子
RS Rotating slit plate FS Fixed slit plate LED Emitting element PD Light receiving element ADD Adder circuit JG Judgment circuit CT Power supply common terminal
Claims (1)
一対のＡ相信号生成用受光素子の受光出力からＡ相信号、一対のＢ相信号生成用受光素子の受光出力からＢ相信号を生成する相信号生成回路と、
上記受光出力のうち任意の３つの受光出力の受光出力をレベル加算する加算部と、
上記加算レベルが、１つの受光出力の最大レベルと２つの受光出力の合計最大レベルとの範囲内であるときは受光素子が正常でかつ電源コモン端子が上記受光素子に接続されていると判定し、上記加算レベルが０でないが上記範囲外であるときは受光素子が異常でかつ電源コモン端子が上記受光素子に接続されていると判定し、上記加算レベルが０であるときは電源コモン端子が上記受光素子に未接続であると判定する判定部と、
を備えたことを特徴とするロータリエンコーダ。 A pair of A-phase signal generating light receiving elements that receive the light emitted from the light projecting element through a rotating slit and reverse each phase by 180 degrees and generate two first and second light receiving outputs that are 180 degrees out of phase with each other; For generating a pair of B-phase signals that generate two third and fourth light receiving outputs that are 90 degrees out of phase with each of the two first and second light receiving outputs and are inverted every 180 degrees and are 180 degrees out of phase with each other. In a rotary encoder comprising a light receiving element,
A phase signal generation circuit for generating an A phase signal from a light receiving output of a pair of light receiving elements for A phase signal generation, and a B phase signal from a light receiving output of a pair of light receiving elements for generating a B phase signal;
An adder for level-adding the light reception outputs of any three light reception outputs among the light reception outputs;
When the addition level is within the range between the maximum level of one light receiving output and the total maximum level of two light receiving outputs, it is determined that the light receiving element is normal and the power supply common terminal is connected to the light receiving element. When the addition level is not 0 but outside the above range, it is determined that the light receiving element is abnormal and the power supply common terminal is connected to the light receiving element. When the addition level is 0, the power supply common terminal is A determination unit that determines that the light receiving element is not connected;
A rotary encoder comprising:
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