JPH02167425A - Magnetic encoder - Google Patents
Magnetic encoderInfo
- Publication number
- JPH02167425A JPH02167425A JP32272388A JP32272388A JPH02167425A JP H02167425 A JPH02167425 A JP H02167425A JP 32272388 A JP32272388 A JP 32272388A JP 32272388 A JP32272388 A JP 32272388A JP H02167425 A JPH02167425 A JP H02167425A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- encoder plate
- plate
- encoder
- detecting element
- 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
- 238000001514 detection method Methods 0.000 claims abstract description 27
- 239000000696 magnetic material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Landscapes
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、エンコーダ板の、検出素子側に対する相対的
回転運動を磁気の変化信号に変換する磁気式エンコーダ
に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic encoder that converts rotational movement of an encoder plate relative to a detection element side into a magnetic change signal.
此種の磁気式エンコーダは磁気検出素子に対し、磁性材
の円板又は円筒に一定ピッチ又は必要なピッチに着磁し
て、多極磁石としたものを回転させる構造が一般的であ
る。着磁した円板又は円筒（以下エンコーダ板と称する
）の磁気検出素子に対する相対的回転運動により、磁界
の変化を磁気検出素子上に発生させ、この変化を磁気検
出素子により検出し、必要に応じて磁気検出素子の出力
を増幅、波形整形して電気信号として出力している。This type of magnetic encoder generally has a structure in which a multipolar magnet is rotated by magnetizing a disk or cylinder made of magnetic material at a constant pitch or a necessary pitch for a magnetic detection element. The rotational movement of a magnetized disk or cylinder (hereinafter referred to as an encoder plate) relative to the magnetic sensing element generates a change in the magnetic field on the magnetic sensing element, this change is detected by the magnetic sensing element, and The output of the magnetic detection element is amplified and waveform-shaped and output as an electrical signal.
上記磁気式エンコーダは、エンコーダ板の全周に一括着
磁する方法と１点又は数点を同時に着磁しながらエンコ
ーダ板を必要角度ずつ回転して全点を着磁する方法が存
するが、前者の方法の場合、専用の着磁ヨークを必要と
し、また、着磁ヨークの構造上、細かいピッチのものは
作成できないという欠陥が存し、後者の方法は、着磁す
るのに時間がかかるという欠陥が存した。There are two methods for the above magnetic encoder: one is to magnetize the entire circumference of the encoder plate all at once, and the other is to magnetize one or several points at the same time and rotate the encoder plate by the required angle to magnetize all points. The latter method requires a dedicated magnetizing yoke, and due to the structure of the magnetizing yoke, it is not possible to produce fine pitch magnets, and the latter method requires a long time to magnetize. There was a defect.
本発明は上記欠陥を除去することを目的とするものであ
る。The present invention aims to eliminate the above-mentioned defects.
上記目的を達成するため本発明は、エンコーダ板の磁気
検出素子に対する相対的回転運動を検出する装置におい
て、前記エンコーダ板に全周にわたって多数のスリット
を設け、前記エンコーダ板を磁路とする磁界を前記磁気
検出素子上に形成したものである。In order to achieve the above object, the present invention provides a device for detecting relative rotational movement of an encoder plate with respect to a magnetic detection element, in which a large number of slits are provided on the entire circumference of the encoder plate, and a magnetic field is generated using the encoder plate as a magnetic path. It is formed on the magnetic detection element.
エンコーダ板が磁気検出素子に対して相対的に回転する
と、エンコーダ板のスリットごとに磁界の変化が磁気検
出素子上に発生し、磁気検出素子は、この変化を検出す
る。When the encoder plate rotates relative to the magnetic sensing element, a change in the magnetic field is generated on the magnetic sensing element for each slit in the encoder plate, and the magnetic sensing element detects this change.
以下に本発明の構成を添付図面に示す実施例を参照して
詳細に説明する。The structure of the present invention will be described in detail below with reference to embodiments shown in the accompanying drawings.
第１図において、２は、基板４が図板６上を平行移動自
在に支持された自在平行定規の操作ヘッドであり、前記
基板４に複軸８が固定され、該複軸８に主軸ｌＯが、図
板６面に垂直な軸線を中心として回転自在に嵌合されて
いる。前記主軸１０の上部には、ハンドル１２が固定さ
れ、前記主軸１０の下端には定規取付板１４が固定され
ている。In FIG. 1, reference numeral 2 denotes an operation head of a universal parallel ruler in which a substrate 4 is supported so as to be able to move in parallel on a drawing board 6. A multiple shaft 8 is fixed to the substrate 4, and a main axis lO are fitted to be rotatable about an axis perpendicular to the 6th surface of the drawing board. A handle 12 is fixed to the upper part of the main shaft 10, and a ruler mounting plate 14 is fixed to the lower end of the main shaft 10.
前記複軸８の鍔部には、盤状の取付部材１６が固定され
、該部材１６の外径部に一体的に固設されたリング状の
マグネット１８の上下面には、盤状の磁性材から成るエ
ンコーダ板２０と円板２２が互いに平行に固定されてい
る。A plate-shaped mounting member 16 is fixed to the flange of the double shaft 8, and a plate-shaped magnetic plate is attached to the upper and lower surfaces of a ring-shaped magnet 18 that is integrally fixed to the outer diameter of the member 16. An encoder plate 20 and a disk 22 made of wood are fixed in parallel to each other.
前記エンコーダ板２０には、全周にわたり、所定の間隔
を存して、スリット２４が透設されている。The encoder plate 20 has slits 24 formed therethrough at predetermined intervals over the entire circumference.
２６は前記定規取付板１４の偏心位置に固定された磁界
変化検出装置であり、これに接続する磁気検出素子２８
が前記エンコーダ板２０と円板２２との間に配置されて
いる。Reference numeral 26 denotes a magnetic field change detection device fixed at an eccentric position of the ruler mounting plate 14, and a magnetic detection element 28 connected to this device.
is arranged between the encoder plate 20 and the disk 22.
上記した構成において、ハンドル１２を手操作により、
回転すると、定規取付抜工４が複軸８を中心として回転
し、定規取付板１４と連動する磁気検出素子２８はエン
コーダ板２０と円板２２との間を複軸８の中心軸を中心
とする円線上に沿って移動する。このとき、磁気検出素
子２８は、エンコーダ板２０のスリット２４によって生
じる磁界の変化を検出し、磁界変化検出装置２６は、磁
気検出素子２８の検出信号に基いて、スリット２４ごと
に変化する電気信号を出力する。尚、定規数付板１４の
回転方向を検出する場合には、２個の磁気検出素子を互
いに９０度位相の異なる信号を出力するようにエンコー
ダ板２０と円板２２間に配置するものである。尚、磁気
検出素子２８上の磁界を強化する構成として、円板２２
にもエンコーダ板２０と同様なスリットを設け、エンコ
ーダ′Ｆｉ、２０と円板２２を一体化して、これを磁気
検出素子２８に対して相対的に回転させる構成としても
良い。この場合、板２０，２２のスリットが重なるよう
に位置を決めると、磁力線は非スリット部分の間に集中
する一方、スリット部分の磁界は一層弱くなる。In the above configuration, by manually operating the handle 12,
When rotated, the ruler mounting punch 4 rotates around the multiple shaft 8, and the magnetic detection element 28 interlocking with the ruler mounting plate 14 moves between the encoder plate 20 and the disc 22 around the central axis of the multiple shaft 8. Move along the circular line. At this time, the magnetic detection element 28 detects a change in the magnetic field generated by the slit 24 of the encoder plate 20, and the magnetic field change detection device 26 generates an electric signal that changes for each slit 24 based on the detection signal of the magnetic detection element 28. Output. In addition, when detecting the rotational direction of the ruler plate 14, two magnetic detection elements are arranged between the encoder plate 20 and the disk 22 so as to output signals having a phase difference of 90 degrees from each other. . Note that as a configuration for strengthening the magnetic field on the magnetic detection element 28, the disk 22
It is also possible to provide a slit similar to that of the encoder plate 20, to integrate the encoder 'Fi, 20 and the disc 22, and to rotate it relative to the magnetic detection element 28. In this case, if the slits of the plates 20 and 22 are positioned so that they overlap, the lines of magnetic force will be concentrated between the non-slit parts, while the magnetic field in the slit parts will be weaker.
次に、磁気エンコーダの他の実施例を第４図を参照して
説明する。Next, another embodiment of the magnetic encoder will be described with reference to FIG.
３０は回転軸であり、これにスリット３２が設けられた
エンコーダ板３４が連結している。前記回転軸３０には
筒状のマグネット３６が回転軸３０に対して回転自在に
嵌合し、このマグネット３６に軟質磁性材のヨーク３８
が固設され、該ヨーク３８に磁気検出素子４０が、前記
エンコーダ板３４に対向して固設されている。前記ヨー
ク３８は、固定側に固定される。該状態において、磁束
はヨーク３８とエンコーダ板３４との間に集中し、磁気
検出素子４０上の磁界を強化することができる。30 is a rotating shaft, and an encoder plate 34 provided with a slit 32 is connected to this. A cylindrical magnet 36 is fitted into the rotating shaft 30 so as to be rotatable with respect to the rotating shaft 30, and a yoke 38 made of a soft magnetic material is attached to the magnet 36.
is fixed to the yoke 38, and a magnetic detection element 40 is fixed to the yoke 38, facing the encoder plate 34. The yoke 38 is fixed on the fixed side. In this state, magnetic flux is concentrated between the yoke 38 and the encoder plate 34, and the magnetic field on the magnetic sensing element 40 can be strengthened.
回転軸３０を回転すると、エンコーダ板３４が回転し、
磁気検出素子４０上には、スリット３２ごとに磁界強弱
の変化が現れ、この変化は磁気検出素子４０によって検
出される。尚、第５図に示すように磁気検出素子４２の
センサーチップ４４のサイズよりエンコーダ板４６のス
リット４８のピッチが小さくなった場合は、磁気検出素
子４２とエンコーダ板４６との間に先細状の軟質磁性材
による補助ヨーク５０を設け、磁束を更に集中させる構
成とする。When the rotating shaft 30 is rotated, the encoder plate 34 is rotated,
A change in the strength of the magnetic field appears on the magnetic detection element 40 for each slit 32, and this change is detected by the magnetic detection element 40. Incidentally, as shown in FIG. 5, if the pitch of the slits 48 of the encoder plate 46 is smaller than the size of the sensor chip 44 of the magnetic detection element 42, a tapered shape is formed between the magnetic detection element 42 and the encoder plate 46. An auxiliary yoke 50 made of a soft magnetic material is provided to further concentrate the magnetic flux.
本発明は上述の如く構成したので、光学式のようにゴミ
に影響されず、しかも検出のレスポンスの良いエンコー
ダを提供でき、また、エンコーダ板に対して着磁の必要
がなく、且つ分解能の高い磁気式エンコーダを提供する
ことができる等の効果が存する。Since the present invention is configured as described above, it is possible to provide an encoder that is not affected by dust like an optical type and has a good detection response.It also does not require magnetization of the encoder plate and has high resolution. There are advantages such as being able to provide a magnetic encoder.
第工図は断面図、第２図は拡大断面図、第３図は外観図
、第４図は他の実施例の外観説明図、第５図は他の実施
例の説明図である。
２・・・操作ヘッド、４・・・基板、６・・・図板、８
・・・複軸、ｌ○・・・主軸、１２・・・ハンドル、１
４・・・定規取付板、工６・・・取付部材、１８・・・
マグネット、２０・・・エンコーダ板、２２・・・円板
、２４・・・スリット、２６・・・磁界変化装置、２８
・・・磁気検出素子、３０・・・回転軸、３２・・・ス
リット、３４・・・エンコーダ板、３６・・・マグネッ
ト、３８・・・ヨーク、４０・・・磁気検出素子、４２
・・・磁気検出素子、４４・・・センサーチップ、４６
・・・エンコーダ板、４８・・・スリット、５０・・・
ヨーク2 is an enlarged sectional view, FIG. 3 is an external view, FIG. 4 is an explanatory external view of another embodiment, and FIG. 5 is an explanatory diagram of another embodiment. 2... Operation head, 4... Board, 6... Drawing board, 8
...Double shaft, l○...Main shaft, 12...Handle, 1
4...Ruler mounting plate, work 6...Mounting member, 18...
Magnet, 20... Encoder plate, 22... Disk, 24... Slit, 26... Magnetic field change device, 28
... Magnetic detection element, 30 ... Rotating shaft, 32 ... Slit, 34 ... Encoder plate, 36 ... Magnet, 38 ... Yoke, 40 ... Magnetic detection element, 42
... Magnetic detection element, 44 ... Sensor chip, 46
...Encoder plate, 48...Slit, 50...
yoke
Claims (1)
運動を検出する装置において、前記エンコーダ板に全周
にわたって多数のスリットを設け、前記エンコーダ板を
磁路とする磁界を前記磁気検出素子上に形成したことを
特徴とする磁気式エンコーダ。(1) In a device for detecting relative rotational movement of an encoder plate with respect to a magnetic detection element, a large number of slits are provided in the encoder plate over the entire circumference, and a magnetic field with the encoder plate as a magnetic path is formed on the magnetic detection element. A magnetic encoder characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32272388A JPH02167425A (en) | 1988-12-21 | 1988-12-21 | Magnetic encoder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32272388A JPH02167425A (en) | 1988-12-21 | 1988-12-21 | Magnetic encoder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02167425A true JPH02167425A (en) | 1990-06-27 |
Family
ID=18146903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32272388A Pending JPH02167425A (en) | 1988-12-21 | 1988-12-21 | Magnetic encoder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02167425A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0973007A1 (en) * | 1998-07-16 | 2000-01-19 | Brown & Sharpe Tesa S.A. | Device for longitudinal measurement |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51469A (en) * | 1974-06-20 | 1976-01-06 | Shoichi Murata | Jushikakonyoru panerueseizohoho |
-
1988
- 1988-12-21 JP JP32272388A patent/JPH02167425A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51469A (en) * | 1974-06-20 | 1976-01-06 | Shoichi Murata | Jushikakonyoru panerueseizohoho |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0973007A1 (en) * | 1998-07-16 | 2000-01-19 | Brown & Sharpe Tesa S.A. | Device for longitudinal measurement |
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