JPS58106414A - Detecting method for angle of rotation using optical sensor - Google Patents
Detecting method for angle of rotation using optical sensorInfo
- Publication number
- JPS58106414A JPS58106414A JP20522281A JP20522281A JPS58106414A JP S58106414 A JPS58106414 A JP S58106414A JP 20522281 A JP20522281 A JP 20522281A JP 20522281 A JP20522281 A JP 20522281A JP S58106414 A JPS58106414 A JP S58106414A
- Authority
- JP
- Japan
- Prior art keywords
- groove
- rotation
- angle
- rotating body
- light
- 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 claims abstract description 29
- 238000000034 method Methods 0.000 title claims description 5
- 238000001514 detection method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Linear Or Angular Velocity Measurement And Their Indicating Devices (AREA)
- Optical Transform (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は光学センサを用いた回転角度の検出方法に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of detecting a rotation angle using an optical sensor.
従来、この種の回転角度の検出方法としては、例えば、
回転または回動する物体（以下、回転体という）の回転
軸と光軸とが平行になるように対向させて配設した光学
センサとしての発光素子および受光素子を備え、光軸に
直交する平面内を回転体がある角度回転することに伴い
、発光素子からの照射光が回転体により遮ぎられて受光
素子の受光量が回転体の角度変位に応じて変化すること
に着目し、かかる受光量を検出してこれを回転角度に換
算するようにしたものが提供されている。Conventionally, this type of rotation angle detection method includes, for example,
A plane that is perpendicular to the optical axis and includes a light-emitting element and a light-receiving element as an optical sensor, which are arranged facing each other so that the rotational axis of a rotating or rotating object (hereinafter referred to as a rotating body) and the optical axis are parallel to each other. Focusing on the fact that as the rotating body rotates at a certain angle within the rotating body, the irradiated light from the light emitting element is blocked by the rotating body, and the amount of light received by the light receiving element changes according to the angular displacement of the rotating body. There is a device that detects the amount and converts it into a rotation angle.
しかしこれによると、回転角度の検出に際して光学セン
サの光軸を回転体の回転軸に平行に設置しなくては力ら
ないため、回転体の回転半径が短い場合等におい千はそ
の回転軸や軸受等が邪魔になシ、回転体によって光軸が
適切に遮断されるような位置に光学センサを配設するこ
とが不可能となる場合も生じ、換言すれば回転体の形状
や位置、その周囲の状況等によって角度検出作業が制約
を受け、回転体および光学センサの相対的な位置の選択
、呵整に厳密さを要求されて煩維かつ不便であるという
欠点があった。However, according to this method, when detecting the rotation angle, the optical axis of the optical sensor must be installed parallel to the rotation axis of the rotating body. There may be cases where it is impossible to install the optical sensor in a position where the optical axis is appropriately blocked by the rotating body due to bearings etc. getting in the way.In other words, due to the shape and position of the rotating body, The angle detection work is restricted by the surrounding conditions, and the selection and adjustment of the relative positions of the rotating body and the optical sensor are required to be exact, which is tedious and inconvenient.
本発明は上記の点に鑑み提案されたものであり、その目
的とするところは回転体にその回転軸と直交する方向に
延びる溝を形成すると共にこの溝を介して光学センサを
対向配設し、前記溝を介した受光素子の受光量が可曲線
状に変化することを利用してこの受光量の変化により回
転角度を検出するようにし、回転体の回転軸に直交する
方向に光学センサの光軸が位置するような検出方法を採
用して、回転体の形状や周囲の状況、回転体および光学
センサの相対的な位置等による角度検出時の種々の制約
を解消し、簡便かつ正確に回転角度を検出し得るように
した、光学センサを用いた回転角度の検出方法を提供す
るにある。The present invention has been proposed in view of the above points, and its object is to form a groove extending in a direction perpendicular to the rotational axis of the rotating body, and to arrange optical sensors facing each other through this groove. , the amount of light received by the light receiving element through the groove changes in a curved shape, and the rotation angle is detected from the change in the amount of received light, and the optical sensor is moved in the direction perpendicular to the rotation axis of the rotating body. Adopting a detection method in which the optical axis is positioned, it eliminates various constraints during angle detection due to the shape of the rotating body, surrounding conditions, relative position of the rotating body and optical sensor, etc., making it simple and accurate. An object of the present invention is to provide a method for detecting a rotation angle using an optical sensor, which is capable of detecting a rotation angle.
以下、咽に沿って本発明を説明する。Hereinafter, the present invention will be explained along the throat.
第１図は回転体としての、テープレコーダのテンション
アーム１の回転角度を検出する場合を示し７ており、図
においてテンションアーム１の回転軸０をなす回転体と
しての丸棒状の軸部１ａには、その下端部に回転軸Ｏに
直交する方向に延びる溝１ｂが設けられている。この溝
１ｂを介して、光軸が回転軸０に直交するように発光ダ
イオードの如き発光素子２ａとフォトトランジスタの如
き受光素子２ｂとが対向して配設され、これら発光γ子
２ａおよび受光素子２ｂにより光学センサ２が構成され
ている。なお光学センサ２には発光素子２ａのドライブ
回路、受光素子２ｂに後続する増幅回路等が接続される
ものであるが、これらは便宜上、図示を省略する。FIG. 1 shows the case of detecting the rotation angle of the tension arm 1 of a tape recorder, which is a rotating body. is provided with a groove 1b extending in a direction perpendicular to the rotation axis O at its lower end. A light emitting element 2a such as a light emitting diode and a light receiving element 2b such as a phototransistor are disposed facing each other through the groove 1b so that the optical axis is perpendicular to the rotation axis 0. 2b constitutes an optical sensor 2. Note that the optical sensor 2 is connected to a drive circuit for the light emitting element 2a, an amplifier circuit subsequent to the light receiving element 2b, etc., but these are omitted from illustration for convenience.
第２図は軸部１ａの溝１ｂの部分を拡大した本発明の原
理説明図であり、実線で示した軸部１ａｉｄ初期の状態
を、また破線で示した軸部ｌａ′はテンションアーム１
すなわち軸部１ａが角度θだけ回動した後の状態を夫々
示している。FIG. 2 is an explanatory view of the principle of the present invention in which the groove 1b of the shaft portion 1a is enlarged, and the initial state of the shaft portion 1aid is shown by a solid line, and the shaft portion la' shown by a broken line is an illustration of the tension arm 1.
That is, the respective states are shown after the shaft portion 1a has been rotated by an angle θ.
しかして第２図において、溝１ｂの長さをｔ１溝１ｂの
幅をｍとすると、テンションアーム１すつ
なわち軸部が回動する前の受光素子２ｂの受光量対する
、回動後の同受光量の比は光束の幅の比、すなわち−に
て表わすことができる。ここで、となることは図からも
明らかであり、この式からθ＝０°のとき玉＝１．θ＝
９０’ −ｔ ａｎ−１（−’）のときＢ
ｍ王＝０とな
る。Therefore, in FIG. 2, if the length of the groove 1b is t1 and the width of the groove 1b is m, the amount of light received by the light receiving element 2b before the tension arm 1, that is, the shaft portion rotates, is The ratio of the same amount of received light can be expressed as the ratio of the width of the luminous flux, that is, -. Here, it is clear from the figure that when θ=0°, ball=1. θ=
B when 90' -t an-1(-')
m king = 0.
ガ１
すなわち、０°≦θ≦９０°−ｔａｎ ’（−！−）の
範囲で−のｍ ｍ
値は房部線上にあるため、ｍを基準値とすれば王は受光
素子２ｂの受光量そのものとみなすととができる。換言
すればθ＝０″のときの受光量を測定してその呟を縦軸
上にプロットし、この点と横軸上のθ＝９０°−ｔａｎ
’（’）の点とを可曲線で結べば回転角度に対する受光
量の変化を予めグラフ化することができる。従って受光
素子２ｂの受光量を測定するだけで前記グラフから回転
体の回転角度を正確に検出することができるものである
。In other words, in the range 0°≦θ≦90°−tan' (-!-), the negative m m value is on the tuft line, so if m is the reference value, then the amount of light received by the light-receiving element 2b is If we consider it as such, we can make a difference. In other words, measure the amount of light received when θ = 0'', plot it on the vertical axis, and compare this point with θ = 90° - tan on the horizontal axis.
By connecting the points '(') with a curved line, it is possible to graph the change in the amount of received light with respect to the rotation angle in advance. Therefore, the rotation angle of the rotating body can be accurately detected from the graph simply by measuring the amount of light received by the light receiving element 2b.
なお、回転体の回転角度に比例した受光量を得たい場合
には、回転角度−受光量を示す可曲線のうち直線に近い
部分を使用すればよく、この場合にはグラフ上でこの直
線に近い部分が始まる角度を初期値として回転体を予め
同じ角度だけ傾けておけばよい。In addition, if you want to obtain the amount of light received that is proportional to the rotation angle of the rotating body, you can use the part of the curved line that indicates rotation angle - amount of light received that is close to a straight line. The rotating body may be tilted in advance by the same angle, with the angle at which the near portion starts as an initial value.
以上述べたように本発明によれば、回転体に、その回転
軸に直交する方向に延びる溝を形成すると共に、この溝
を介して光学センサを対向配設し、回転体の回転に伴な
って可曲線状に変化する受光素子の受光量を測定するこ
とにより回転体の回転角度を検出するようにしたから、
回転体の回転軸に直交する方向に光学センサの光軸が位
置するような位置関係のもとに回転角度の検出を行なう
ことができ、従来の如く回転軸と光軸とが平行な場合に
生じる種々の欠点、すなわち回転体の形状や周囲の状況
、回転体および光学センサの相対的な位置等による角度
検出時の制約から解放され、回転体および光学センサの
位置の選択や調整に煩られされることもなく簡便で常時
正確な回転角塵の検出が行なえる効果を有する。As described above, according to the present invention, a groove extending in a direction perpendicular to the rotational axis of the rotating body is formed, and optical sensors are disposed facing each other through the groove, and the optical sensor is disposed in a direction opposite to the rotating body. The rotation angle of the rotating body is detected by measuring the amount of light received by the light receiving element, which changes in a curved shape.
The rotation angle can be detected based on the positional relationship in which the optical axis of the optical sensor is located in the direction perpendicular to the rotation axis of the rotating body, and the rotation angle can be detected in the case where the rotation axis and the optical axis are parallel as in the conventional case. It frees you from the various disadvantages that arise during angle detection, such as the shape of the rotating body, surrounding conditions, relative positions of the rotating body and optical sensor, etc., and eliminates the hassle of selecting and adjusting the positions of the rotating body and optical sensor. This has the effect that rotating angle dust can be detected simply and accurately at all times without being affected.
【図面の簡単な説明】
第１図は本発明の一実施例を示す斜視図、第２図は同じ
く原理説明図である。
１・・・テンションアーム、ｌａ、ｌａ・・・軸部、１
ｂ・・・溝、２・・・光学センサ、２ａ・・・発光素子
、２ｂ・・・受光素子、０・・・回転軸。
特 許 出 頓 人 フオステクス株式会社第２図BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is a diagram illustrating the principle of the invention. 1...Tension arm, la, la...shaft, 1
b... Groove, 2... Optical sensor, 2a... Light emitting element, 2b... Light receiving element, 0... Rotation axis. Patent issuer Foostex Co., Ltd. Figure 2
Claims (1)
すると共に、この溝を介して光学センサとしての発光素
子および受光素子を対向させて配設し、前記回転体の回
転に伴なって回向線状に変化する、前記溝を介した前記
受光素子の受光量を測定することによシ前記回転体の回
転角度を検出することを特徴とした光学センサを用いた
回転角度の検出方法δA groove extending in a direction perpendicular to the rotation axis of the rotating body is formed, and a light-emitting element and a light-receiving element as an optical sensor are disposed facing each other through the groove, and as the rotating body rotates, A method for detecting a rotation angle using an optical sensor, characterized in that the rotation angle of the rotating body is detected by measuring the amount of light received by the light receiving element through the groove, which changes in a direction line shape. δ
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20522281A JPS58106414A (en) | 1981-12-21 | 1981-12-21 | Detecting method for angle of rotation using optical sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20522281A JPS58106414A (en) | 1981-12-21 | 1981-12-21 | Detecting method for angle of rotation using optical sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58106414A true JPS58106414A (en) | 1983-06-24 |
Family
ID=16503427
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20522281A Pending JPS58106414A (en) | 1981-12-21 | 1981-12-21 | Detecting method for angle of rotation using optical sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58106414A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002251079A (en) * | 2001-02-26 | 2002-09-06 | Canon Inc | Image forming device and rotating body speed detecting device |
-
1981
- 1981-12-21 JP JP20522281A patent/JPS58106414A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002251079A (en) * | 2001-02-26 | 2002-09-06 | Canon Inc | Image forming device and rotating body speed detecting device |
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