JP2008003064A - Rotary encoder - Google Patents

Rotary encoder Download PDF

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JP2008003064A
JP2008003064A JP2006175766A JP2006175766A JP2008003064A JP 2008003064 A JP2008003064 A JP 2008003064A JP 2006175766 A JP2006175766 A JP 2006175766A JP 2006175766 A JP2006175766 A JP 2006175766A JP 2008003064 A JP2008003064 A JP 2008003064A
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rotary encoder
board
fixing member
substrate portion
substrate
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Takashi Kumagai
隆 熊谷
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Nikon Corp
Sendai Nikon Corp
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Nikon Corp
Sendai Nikon Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary encoder having reliability and durability as a product, by preventing malfunctions, breakages, etc. from occurring, through reduction in the load imposed on a circuit board, due to vibration. <P>SOLUTION: This rotary encoder is equipped with a disk part equipped with a rotary code plate, having a prescribed pattern and rotating by being fixed to the rotary shaft which is a measuring object; a detection means for detecting the prescribed pattern; a board part, mounted with electrical components for processing a detection signal from the detection means, in order to detect the quantity of rotation of the measuring object; a columnar base part for rotatably storing the disk part therein; and a board-part fixing member, disposed between the board part and the base part in order to fix the board part to the base part. The fixing member is an annular member, having a shape with its inside diameter becoming larger, as going toward the board part side. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、ロータリエンコーダに関するものである。   The present invention relates to a rotary encoder.

従来、例えばモータ等の測定対象に装着されて共に回転する回転符号板を備え、該回転符号板の回転量をセンサによって検出することで前記測定対象の回転量を検出するロータリエンコーダが広く用いられている。斯かるロータリエンコーダは、大きく分けて回転符号板を備えた円板部と、該円板部を収納する円柱型のベース部と、回路基板を備えた基板部とから構成されている（例えば、特許文献１を参照。）。
特開２００３−３１５０８６号公報 2. Description of the Related Art Conventionally, for example, a rotary encoder that includes a rotation code plate that is mounted on a measurement target such as a motor and rotates together and detects the rotation amount of the rotation code plate by a sensor is widely used. ing. Such a rotary encoder is roughly composed of a disc portion provided with a rotation code plate, a columnar base portion accommodating the disc portion, and a substrate portion provided with a circuit board (for example, (See Patent Document 1).
Japanese Patent Laid-Open No. 2003-315086

しかしながら、上記従来のロータリエンコーダにおいて、一般に基板部はベース部に対して、樹脂等からなり断面がＬ字形状である円環型の基板部固定部材を介して固定されている。したがって、測定対象の回転等によってロータリエンコーダに振動が加えられた際には、この基板部固定部材が変形を繰り返して振動を増幅してしまうため、基板部ではロータリエンコーダに加えられた振動の数十倍の振動が回路基板上で発生することとなってしまう。このため、回路基板に実装された各電気部品に大きな負荷が加わり、誤動作や破損等の発生を招いてしまうという問題があった。   However, in the conventional rotary encoder described above, the substrate portion is generally fixed to the base portion via an annular substrate portion fixing member made of resin or the like and having an L-shaped cross section. Therefore, when vibration is applied to the rotary encoder due to rotation of the measurement target, etc., the substrate portion fixing member repeatedly deforms and amplifies the vibration. Therefore, the number of vibrations applied to the rotary encoder in the substrate portion. Ten times as much vibration will occur on the circuit board. For this reason, there is a problem that a large load is applied to each electrical component mounted on the circuit board, resulting in malfunction or damage.

そこで本発明は上記問題点に鑑みてなされたものであり、回路基板にかかる振動による負荷を低減して誤動作や破損等の発生を防止することで、製品としての信頼性と耐久性の向上を図ったロータリエンコーダを提供することを目的とする。   Therefore, the present invention has been made in view of the above problems, and by improving the reliability and durability as a product by reducing the load caused by vibration on the circuit board and preventing the occurrence of malfunction or breakage. An object of the present invention is to provide the illustrated rotary encoder.

上記課題を解決するために本発明は、
所定のパターンを有する回転符号板を備え測定対象の回転軸に固定されて回転する円板部と、
前記所定のパターンを検出する検出手段と、
前記測定対象の回転量を検出するべく前記検出手段からの検出信号を処理する電気部品を実装した基板部と、
前記円板部を回転可能に収納する円柱型のベース部と、
前記基板部を前記ベース部に対して固定するためにこれらの間に配置される基板部固定部材とを備えており、
該基板部固定部材は、前記基板部側へ向かって内径が大きくなる形状の環状部材であることを特徴とするロータリエンコーダを提供する。 In order to solve the above problems, the present invention
A disk portion that includes a rotary code plate having a predetermined pattern and rotates while being fixed to a rotation shaft of a measurement target;
Detecting means for detecting the predetermined pattern;
A board portion mounted with an electrical component for processing a detection signal from the detection means to detect the amount of rotation of the measurement object;
A cylindrical base portion for rotatably storing the disk portion;
A substrate portion fixing member disposed between the substrate portion and the base portion for fixing the substrate portion;
The substrate portion fixing member is an annular member having an inner diameter that increases toward the substrate portion side.

また本発明のロータリエンコーダは、
前記基板部固定部材は、中心軸方向の断面が略直角三角形状の環状部材であることを特徴とする。 The rotary encoder of the present invention is
The substrate portion fixing member is an annular member having a substantially right triangle shape in cross section in the central axis direction.

本発明によれば、回路基板にかかる振動による負荷を低減して誤動作や破損等の発生を防止することで、製品としての信頼性と耐久性の向上を図ったロータリエンコーダを提供することができる。   According to the present invention, it is possible to provide a rotary encoder that is improved in reliability and durability as a product by reducing a load caused by vibration applied to a circuit board and preventing occurrence of malfunction or damage. .

以下、本発明の実施形態に係るロータリエンコーダを添付図面に基づいて説明する。
なお、本実施形態に係るロータリエンコーダは、光学式の所謂ホローシャフト型ロータリエンコーダであって、測定対象をモータとして説明する。
図１、及び図２は、本発明の実施形態に係るロータリエンコーダの構成を示す断面図、及び分解図である。 Hereinafter, a rotary encoder according to an embodiment of the present invention will be described with reference to the accompanying drawings.
The rotary encoder according to the present embodiment is an optical so-called hollow shaft type rotary encoder, and the measurement target will be described as a motor.
1 and 2 are a sectional view and an exploded view showing a configuration of a rotary encoder according to an embodiment of the present invention.

図１及び図２に示すように、本ロータリエンコーダ１は、回転符号板２を備えた円板部３と、該円板部３を回転可能に収納するベース部４と、回路基板５を備えた基板部６と、ベース部４に対して基板部６を固定するためにこれらの間に配置された基板部固定部材７とからなる。   As shown in FIGS. 1 and 2, the rotary encoder 1 includes a disc portion 3 having a rotary code plate 2, a base portion 4 that rotatably accommodates the disc portion 3, and a circuit board 5. The substrate portion 6 and a substrate portion fixing member 7 disposed between the substrate portion 6 and the base portion 4 to fix the substrate portion 6 to each other.

本ロータリエンコーダ１において、円板部３は、不図示のモータの回転軸８を挿入するための挿入穴３ａが形成された円柱形状の部材である。そして、斯かる形状の円板部３の上側には、上述した回転符号板２が外挿されている。この回転符号板２は、円盤状の部材であってその外周部分にはスリット２ａが円周方向に沿って等間隔で形成されている。なお、斯かる構成の円板部３とモータの回転軸８との固定は、図１に示すように円板部３の挿入穴３ａにモータの回転軸８を挿入し、上側から止めねじ９によって締め付け固定することで行われる。   In the present rotary encoder 1, the disc portion 3 is a columnar member in which an insertion hole 3a for inserting a rotation shaft 8 of a motor (not shown) is formed. And the above-mentioned rotation code | symbol plate 2 is extrapolated above the disk part 3 of such a shape. The rotary code plate 2 is a disk-shaped member, and slits 2a are formed at equal intervals along the circumferential direction on the outer peripheral portion thereof. In addition, the disk portion 3 having such a configuration and the rotation shaft 8 of the motor are fixed by inserting the rotation shaft 8 of the motor into the insertion hole 3a of the disk portion 3 as shown in FIG. This is done by tightening and fixing.

また本ロータリエンコーダ１において、ベース部４は、円板部３を収納しかつモータに取り付けられて該モータの回転軸８を円板部３の挿入穴３ａへ導くための上下方向に貫通した開口部４ａを備えた円柱形状の筐体である。ここで、このベース部４の開口部４ａを形成する内壁部分にはベアリング５ａ,５ｂが備えられており、これによってベース部４は円板部３を回転可能に支持している。また、斯かるベース部４には、上下方向に貫通した貫通孔４ｂがさらに形成されており、この貫通孔４ｂには光源１０ａとコリメータレンズ１０ｂからなる光源ユニット１０が備えられている。   Further, in the rotary encoder 1, the base portion 4 is an opening penetrating in the vertical direction for accommodating the disc portion 3 and being attached to the motor to guide the rotating shaft 8 of the motor to the insertion hole 3 a of the disc portion 3. It is a cylindrical housing provided with a portion 4a. Here, bearings 5a and 5b are provided on the inner wall portion forming the opening 4a of the base portion 4, and thereby the base portion 4 supports the disc portion 3 rotatably. Further, the base portion 4 is further formed with a through hole 4b penetrating in the vertical direction, and the light source unit 10 including the light source 10a and the collimator lens 10b is provided in the through hole 4b.

また本ロータリエンコーダ１において、基板部６は、基板部固定部材７を介してベース部４の上側に取り付けられることで該ベース部４の開口部４ａを略閉塞する円形の板状部材である。この基板部６の下面には、上述したベース部４の光源ユニット１０からの光を受光するための光センサ５ａ、及び該光センサ５ａからの検出信号を処理するアナログ／デジタル変換器等の電気部品等を実装した上述の回路基板５が備えられている。   Further, in the present rotary encoder 1, the substrate portion 6 is a circular plate-like member that substantially closes the opening 4 a of the base portion 4 by being attached to the upper side of the base portion 4 via the substrate portion fixing member 7. On the lower surface of the substrate section 6, an optical sensor 5a for receiving the light from the light source unit 10 of the base section 4 described above, and an electrical such as an analog / digital converter for processing a detection signal from the optical sensor 5a. The above-described circuit board 5 on which components and the like are mounted is provided.

また、本ロータリエンコーダ１において最も特徴的な基板部固定部材７は、樹脂からなり図２に示すように内径が基板部６側へ向かって大きくなる環状部材、より詳しくは図１に示すように中心軸方向の断面が基板部６側へ向かって細くなる略直角三角形状の環状部材である。このように、基板部固定部材７の断面を基板部６側へ向かって細くなる略直角三角形状とすることで、基板部固定部材７に基板部６を取り付けた際に該基板部６の下面に備えられている回路基板５と当該基板部固定部材７とが干渉してしまうことを防ぎながら、基板部固定部材７の剛性を高めることができる。   Further, the most characteristic board portion fixing member 7 in the rotary encoder 1 is made of resin and is an annular member whose inner diameter increases toward the board portion 6 as shown in FIG. 2, more specifically as shown in FIG. It is a substantially right triangle shaped annular member whose cross section in the central axis direction becomes narrower toward the substrate part 6 side. Thus, by making the cross section of the substrate portion fixing member 7 into a substantially right triangle shape that becomes narrower toward the substrate portion 6 side, the lower surface of the substrate portion 6 when the substrate portion 6 is attached to the substrate portion fixing member 7. The rigidity of the board portion fixing member 7 can be increased while preventing the circuit board 5 provided in the board and the board portion fixing member 7 from interfering with each other.

なお、この基板部固定部材７には４つのねじ穴７ａが形成されており、この４つのねじ穴７ａに対してベース部４と基板部６にそれぞれ設けられているねじ穴の位置を合わせ、基板部６側から不図示の固定ねじによって締め付け固定することで、基板部固定部材７及び基板部６のベース部４への固定が行われる。   The board portion fixing member 7 has four screw holes 7a. The screw holes provided in the base portion 4 and the board portion 6 are aligned with the four screw holes 7a. The substrate portion fixing member 7 and the substrate portion 6 are fixed to the base portion 4 by tightening and fixing from the substrate portion 6 side with a fixing screw (not shown).

斯かる構成の本ロータリエンコーダ１において、光源ユニット１０から発せられた光は、モータの回転軸８に連動して回転する回転符号板２に下側から照射される。そしてこの回転符号板２における不図示のスリットを通過した光は、光センサ５ａによって受光されてアナログ信号に変換される。このアナログ信号は、回路基板５に実装されたアナログ／デジタル変換器等の電気部品によってデジタル信号に変換される。そしてこのデジタル信号は、回転符号板２の光透過、不透過に対応するパルス信号となっているため、単位時間当たりのパルス数に基づき、モータの回転軸８の回転量を算出することが可能となる。   In the rotary encoder 1 having such a configuration, the light emitted from the light source unit 10 is irradiated from the lower side to the rotary code plate 2 that rotates in conjunction with the rotation shaft 8 of the motor. The light that has passed through a slit (not shown) in the rotary code plate 2 is received by the optical sensor 5a and converted into an analog signal. This analog signal is converted into a digital signal by an electrical component such as an analog / digital converter mounted on the circuit board 5. Since this digital signal is a pulse signal corresponding to light transmission and non-transmission of the rotary code plate 2, the amount of rotation of the rotating shaft 8 of the motor can be calculated based on the number of pulses per unit time. It becomes.

また、本ロータリエンコーダ１において、基板部固定部材７は、上述のようにその断面を基板部６側へ向かって細くなる略直角三角形状としたことで、断面がＬ字形状であった従来の基板部固定部材に比べて、径方向の厚みを大きくしている。これにより、基板部固定部材７の剛性を高めることができ、モータの回転等によって本ロータリエンコーダ１に振動が加えられても、基板部固定部材７の変形を効果的に抑えることができる。したがって、基板部６において大きな振動が発生することを防ぐことができるため、回路基板５に実装された各電気部品に大きな負荷が加わることがなく、破損や誤動作等の発生を効果的に防止することができる。このようにして本ロータリエンコーダ１は、製品としての信頼性と耐久性の向上を図ることができる。   Moreover, in this rotary encoder 1, the board | substrate part fixing member 7 was made into the substantially right triangle shape which the cross section narrowed toward the board | substrate part 6 side as mentioned above, The cross section was the conventional L-shaped. The thickness in the radial direction is larger than that of the substrate portion fixing member. Thereby, the rigidity of the board | substrate part fixing member 7 can be improved, and even if a vibration is added to this rotary encoder 1 by rotation of a motor, etc., a deformation | transformation of the board | substrate part fixing member 7 can be suppressed effectively. Therefore, since it is possible to prevent a large vibration from being generated in the board portion 6, a large load is not applied to each electrical component mounted on the circuit board 5, and the occurrence of breakage or malfunction is effectively prevented. be able to. In this way, the rotary encoder 1 can improve the reliability and durability as a product.

なお、本実施形態では、基板部固定部材７としてその断面を基板部６側へ向かって細くなる略直角三角形状とした環状部材を示している。しかしながら基板部固定部材７の断面形状はこれに限られるものでなく、当該基板部固定部材７に基板部６を取り付けた際に該基板部６の回路基板５と基板部固定部材７とが干渉することなく、基板部固定部材７の剛性を高めることができるものであれば様々な形状を採用することができる。例えば、図３（ａ）に示すように長方形の内径側上部を切り欠いた形状の断面や、図３（ｂ）に示すように直角三角形の斜辺を撓ませた形状の断面等としても良い。   In the present embodiment, an annular member having a substantially right triangular shape whose cross section narrows toward the substrate portion 6 side is shown as the substrate portion fixing member 7. However, the cross-sectional shape of the board portion fixing member 7 is not limited to this, and the circuit board 5 and the board portion fixing member 7 of the board portion 6 interfere when the board portion 6 is attached to the board portion fixing member 7. Various shapes can be adopted as long as the rigidity of the substrate portion fixing member 7 can be increased without doing so. For example, as shown in FIG. 3 (a), a rectangular cross-section having a cut-out upper portion on the inner diameter side, or a cross-section having a right-angled triangular hypotenuse as shown in FIG. 3 (b) may be used.

また、本実施形態では、光源ユニットと光センサを用いた光学式のホローシャフト型ロータリエンコーダを示しているが、本発明はこれに限られるものでなく、磁気式のロータリエンコーダや、円板部がベース部の外部へ突出する回転軸を備えた所謂軸付きロータリエンコーダにも適用することができる。   Further, in the present embodiment, an optical hollow shaft type rotary encoder using a light source unit and an optical sensor is shown, but the present invention is not limited to this, and a magnetic rotary encoder, a disc portion, and the like. However, the present invention can also be applied to a so-called rotary encoder with a shaft provided with a rotating shaft protruding outside the base portion.

本発明の実施形態に係るロータリエンコーダの構成を示す断面図である。It is sectional drawing which shows the structure of the rotary encoder which concerns on embodiment of this invention. 本発明の実施形態に係るロータリエンコーダの構成を示す分解図である。It is an exploded view which shows the structure of the rotary encoder which concerns on embodiment of this invention. 本発明の実施形態に係るロータリエンコーダにおける基板部固定部材の変形例を示す図である。It is a figure which shows the modification of the board | substrate part fixing member in the rotary encoder which concerns on embodiment of this invention.

符号の説明Explanation of symbols

１ ロータリエンコーダ
２ 回転符号板
３ 円板部
４ ベース部
５ 回路基板
６ 基板部
７ 基板部固定部材 DESCRIPTION OF SYMBOLS 1 Rotary encoder 2 Rotation code | symbol 3 Disc part 4 Base part 5 Circuit board 6 Substrate part 7 Substrate part fixing member

Claims (2)

所定のパターンを有する回転符号板を備え測定対象の回転軸に固定されて回転する円板部と、
前記所定のパターンを検出する検出手段と、
前記測定対象の回転量を検出するべく前記検出手段からの検出信号を処理する電気部品を実装した基板部と、
前記円板部を回転可能に収納する円柱型のベース部と、
前記基板部を前記ベース部に対して固定するためにこれらの間に配置される基板部固定部材とを備えており、
該基板部固定部材は、前記基板部側へ向かって内径が大きくなる形状の環状部材であることを特徴とするロータリエンコーダ。 A disk portion that includes a rotary code plate having a predetermined pattern and rotates while being fixed to a rotation shaft of a measurement target;
Detecting means for detecting the predetermined pattern;
A board portion mounted with an electrical component for processing a detection signal from the detection means to detect the amount of rotation of the measurement object;
A cylindrical base portion for rotatably storing the disk portion;
A substrate portion fixing member disposed between the substrate portion and the base portion for fixing the substrate portion;
The rotary encoder according to claim 1, wherein the substrate portion fixing member is an annular member having an inner diameter that increases toward the substrate portion. 前記基板部固定部材は、中心軸方向の断面が略直角三角形状の環状部材であることを特徴とする請求項１に記載のロータリエンコーダ。   The rotary encoder according to claim 1, wherein the substrate portion fixing member is an annular member having a cross section in a central axis direction of a substantially right triangle.
JP2006175766A 2006-06-26 2006-06-26 Rotary encoder Withdrawn JP2008003064A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010286452A (en) * 2009-06-15 2010-12-24 Fuji Electric Systems Co Ltd Encoder
DE102012003963A1 (en) 2011-03-07 2012-09-13 Fanuc Corporation Encoder with resistance to vibration and vibration

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010286452A (en) * 2009-06-15 2010-12-24 Fuji Electric Systems Co Ltd Encoder
DE102012003963A1 (en) 2011-03-07 2012-09-13 Fanuc Corporation Encoder with resistance to vibration and vibration
DE102012003963B4 (en) * 2011-03-07 2014-01-16 Fanuc Corporation Encoder with resistance to vibration and vibration
US8665123B2 (en) 2011-03-07 2014-03-04 Fanuc Corporation Encoder having durability against vibration or shock

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