JPS60155919A - Apparatus for detecting rotary position - Google Patents
Apparatus for detecting rotary positionInfo
- Publication number
- JPS60155919A JPS60155919A JP1138484A JP1138484A JPS60155919A JP S60155919 A JPS60155919 A JP S60155919A JP 1138484 A JP1138484 A JP 1138484A JP 1138484 A JP1138484 A JP 1138484A JP S60155919 A JPS60155919 A JP S60155919A
- Authority
- JP
- Japan
- Prior art keywords
- light
- mixer
- optical
- light receiving
- wavelength
- 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 claims abstract description 23
- 239000013307 optical fiber Substances 0.000 claims abstract description 18
- 238000001514 detection method Methods 0.000 claims description 6
- 239000000446 fuel Substances 0.000 abstract description 8
- 238000002485 combustion reaction Methods 0.000 abstract description 5
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 238000013459 approach Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004065 semiconductor Substances 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
- G01D5/347—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 using displacement encoding scales
- G01D5/34707—Scales; Discs, e.g. fixation, fabrication, compensation
- G01D5/34715—Scale reading or illumination devices
- G01D5/34723—Scale reading or illumination devices involving light-guides
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optical Transform (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、回転位置検出装置、特に回転体から複数チャ
ンネルの分周、回転信号を光信号として得るための回転
位置検出装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotational position detection device, and particularly to a rotational position detection device for dividing the frequency of a plurality of channels from a rotating body and obtaining rotational signals as optical signals.
従来、多気筒内燃機関において、各気筒の点火時期、ま
たは各気筒の燃料噴射弁の開弁時期を検出するために、
ディストリビュータから２チヤンネルの分周、回転信号
を得るようにしたものがある。この場合、スリレトを有
する回転体の両側に発光素子および受光素子をそれぞれ
配置し、画素子間の透光および遮光により、２チヤンネ
ルの分周、回転信号を得ている。ところが、このような
従来技術では、発光素子、受光素子、駆動回路および受
光回路をディストリビュータ内に組込むのが一般的であ
り、半導体素子を熱、振動および電気的雑音などの苛酷
な条件下にある内燃機関本体の近傍に配置する必要があ
るために、レイアウト上および素子選択上、制限が多が
った。Conventionally, in a multi-cylinder internal combustion engine, in order to detect the ignition timing of each cylinder or the opening timing of the fuel injection valve of each cylinder,
There is one that obtains two-channel frequency division and rotation signals from a distributor. In this case, a light-emitting element and a light-receiving element are respectively arranged on both sides of a rotating body having a slit, and two-channel frequency division and rotation signals are obtained by transmitting and blocking light between the pixel elements. However, in such conventional technology, the light emitting element, the light receiving element, the driving circuit, and the light receiving circuit are generally built into the distributor, and the semiconductor element is exposed to harsh conditions such as heat, vibration, and electrical noise. Because it needs to be placed near the internal combustion engine body, there are many restrictions in terms of layout and element selection.
本発明は、そのような事情に鑑みてなされたものであり
、高温、振動および電気的雑音などの条件、の厳しい雰
囲気に、発光部や受光部を配置するのを避けて、複数チ
ャンネルの分周、回転信号を光信号として得るようにし
た回転位置検出装置を提供にる、。とを目仲、とする・
以下、図面により本発明の一実施例について説明すると
、先ず第１図において、この回転位置検出装置１は、デ
ィストリビュータの回転軸２に関連して設けられ、たと
えば４気筒内燃機関、における特定気筒の点火時期ある
いは燃料噴射時期を示す信号と、残余の３つの気筒の点
火時期あるいは燃料噴射時期を示す信号とが、回転位置
検出装置１から得られる。The present invention was made in view of such circumstances, and it is possible to separate multiple channels by avoiding placing the light emitting part and the light receiving part in an atmosphere with severe conditions such as high temperature, vibration, and electrical noise. The present invention provides a rotational position detection device that obtains circumferential and rotational signals as optical signals. We are friends with
Hereinafter, one embodiment of the present invention will be described with reference to the drawings.First, in FIG. A signal indicating the ignition timing or fuel injection timing and a signal indicating the ignition timing or fuel injection timing of the remaining three cylinders are obtained from the rotational position detection device 1.
回転軸２には円板状の回転体３が固定され、この回転体
３にはその回転軸線を中心として異なる半径を有する複
数の仮想円上に１または複数の透孔がそれぞれ穿設され
る。すなわちこの実施例では、半径Ｒ１の仮想円４上に
単一の透孔５が穿設され、前記半径Ｒ１よシも大なる半
径Ｒ２の仮想円６上には、その周方向に等間隔をあけて
４つの透孔Ｉα、 ７ ｂ 、 ７−ｃ 、 ７ ｄが
穿設される。しかも、回転体３の周方向に沿って前記透
孔５，７αは同一位置に配置されており、この位置は特
定気筒の点火時期あるいは燃料噴射時期を示す。また残
余の透孔７ ｈ 、 ７．ｃ 、 ７ ｃｌの位置は残
余の気筒の点火時期あるいは燃料噴射時期を示す。A disk-shaped rotating body 3 is fixed to the rotating shaft 2, and one or more through holes are formed in each of the rotating bodies 3 on a plurality of virtual circles having different radii around the rotational axis. . That is, in this embodiment, a single through hole 5 is bored on an imaginary circle 4 with a radius R1, and on an imaginary circle 6 with a radius R2, which is larger than the radius R1, holes are formed at equal intervals in the circumferential direction. Four through holes Iα, 7b, 7-c, and 7d are bored through the hole. Furthermore, the through holes 5 and 7α are arranged at the same position along the circumferential direction of the rotating body 3, and this position indicates the ignition timing or fuel injection timing of a specific cylinder. In addition, the remaining through holes 7h, 7. The positions c and 7 cl indicate the ignition timing or fuel injection timing of the remaining cylinders.
第２図を併せて参照して、回転体３の一方の面に対向し
て分波器８が配置され、該分波器８に対応して、回転体
３の他方の面には混合器９が対向配置される。分波器８
には、発光素子を言む発光部１０からの光信号を導く第
１光フアイバ１１が １傍続され、混合器９には、受光
素子を含む受光部１２に光信号を導く第２光フアイバ１
３が接続される。発光部１ｏおよび受光部１２は内燃機
関本体から離隔して配置される。Referring also to FIG. 2, a duplexer 8 is disposed opposite to one surface of the rotary body 3, and a mixer is disposed on the other surface of the rotary body 3 corresponding to the duplexer 8. 9 are arranged facing each other. Duplexer 8
A first optical fiber 11 that guides an optical signal from a light emitting section 10, which is a light emitting element, is connected in parallel to the mixer 9, and a second optical fiber that guides an optical signal to a light receiving section 12 that includes a light receiving element is connected to the mixer 9. 1
3 is connected. The light emitting section 1o and the light receiving section 12 are arranged apart from the internal combustion engine main body.
分波器８は、コリメートレンズ１４と、２つのダイクロ
イックミラー１５．１６とがら成シ、各ダイクロイック
ミラー１５．１６はコリメートレンズ１４からの平行光
９光路に沿って相互に間隔をあけてかつ前記光路に対し
て４５度の方向に傾斜して相互に平行に配置される。こ
のようなダイクロイックミラー１５．１６は、２つのプ
リズムイ【着または機械的に結合して成るプリズム集合
体１７の接合面および一方の端面にそれぞれ形成され、
その傾斜方向はコリメートレンズ１４から離反するにつ
れて回転体３側に近接するように設定される。しかも各
ダイクロイックミラー１５．１６は、それぞれ異なる波
長の光を反射し、かつ他の波長の光を透過する機能を有
し、たとえばダイクロイックミラー１５は波長λ１の光
を反射し、ダイクロイックミラー１６は波長λ２の一光
を反射する。The demultiplexer 8 consists of a collimating lens 14 and two dichroic mirrors 15.16. They are arranged parallel to each other and inclined at an angle of 45 degrees. Such dichroic mirrors 15 and 16 are formed on the joint surface and one end surface of the prism assembly 17 formed by bonding or mechanically coupling two prisms, respectively.
The direction of inclination is set so that as it moves away from the collimating lens 14, it approaches the rotating body 3 side. Furthermore, each dichroic mirror 15, 16 has the function of reflecting light of a different wavelength and transmitting light of another wavelength. For example, dichroic mirror 15 reflects light of wavelength λ1, and dichroic mirror 16 reflects light of wavelength λ1. Reflects one light of λ2.
この分波器８におけるコリメートレンズ１４の焦点位置
には、第１光フアイバ１１の端面が対向、配置されてお
シ、第１光フアイバ１１からは異なる２種類の波長λ１
、λ、を含む信号が分波器８に入射される。At the focal position of the collimating lens 14 in this demultiplexer 8, the end surfaces of the first optical fibers 11 are arranged opposite to each other.
, λ is input to the demultiplexer 8.
混合器９は、集光しンズ１８と、２つのダイクロイック
ミラー１９．２０とがら成シ、両ダイクロイックミラー
１９．２０は分波器８の各ダイクロイックミラー１５．
１６に対して９０度傾斜して相互に平行に配置され、２
つのプリズノ・を接着または機械的に結合して成るプリ
ズム集合体２１の接合面および一方の端面にそれぞれ形
成される。The mixer 9 consists of a condensing lens 18 and two dichroic mirrors 19.20, both of which are connected to each dichroic mirror 15.20 of the splitter 8.
arranged parallel to each other at a 90 degree inclination to 16;
The prism assembly 21 is formed by bonding or mechanically bonding two prisms, and is formed on the joint surface and one end surface, respectively.
しかもダイクロイックミラー１９は波長λ１の光を、ま
たダイクロイックミラー２０は波長λ、の光をそれぞれ
反射する機能を有する。Moreover, the dichroic mirror 19 has a function of reflecting light of wavelength λ1, and the dichroic mirror 20 has a function of reflecting light of wavelength λ.
各ダイクロイックミラー１９．２０で反射された光は集
光レンズ１８に導かれるが、この集光レンズ１８の焦点
位置には、第２光ファイ；（１３の端面が対向配置され
る。The light reflected by each dichroic mirror 19, 20 is guided to the condenser lens 18, and at the focal position of the condenser lens 18, the end face of the second optical fiber (13) is arranged to face the second optical fiber.
このような分波器８および混合器９は、回転体３０２つ
の仮想円４，６に対応する位置で、分波器８かも混合器
９への光信号の授受が可能なように配置される。すなわ
ち波長λ□の光を反射するダイクロイックミラー１５．
１９は仮想円６に対応して配置され、波長λ２の光を反
射するダイクロイックミラー１６．２０は仮想円４に対
応して配置される。Such a demultiplexer 8 and a mixer 9 are arranged at positions corresponding to the two virtual circles 4 and 6 of the rotating body 30 so that optical signals can be sent and received from the demultiplexer 8 to the mixer 9. . That is, a dichroic mirror 15 that reflects light of wavelength λ□.
19 is arranged corresponding to the virtual circle 6, and dichroic mirrors 16 and 20 that reflect light of wavelength λ2 are arranged corresponding to the virtual circle 4.
次にこの実施例の作用について説明すると、内燃機関本
体から離隔した位置にある発光部１０からは、波長λ１
、λ、を含む光信号が第１光フアイバ１１を介して分
波器８に入射されており、一方のダイクロイックミラー
１５では回転体３に向けて波長λ、の光が反射され、他
方のタイクロイックミラー１６では回転体３に向けて波
長λ、の光が反射される。Next, the operation of this embodiment will be explained. From the light emitting section 10 located at a distance from the internal combustion engine main body, a wavelength of λ1 is emitted.
, λ is input to the demultiplexer 8 via the first optical fiber 11, and one dichroic mirror 15 reflects the light with the wavelength λ toward the rotating body 3, and the other dichroic mirror 15 reflects the light with the wavelength λ toward the rotating body 3. The loic mirror 16 reflects light with a wavelength λ toward the rotating body 3.
そのような状況で、分波器８および混合器９間に、透孔
５．７αが位置すると、波長λ１．λ。In such a situation, if the through hole 5.7α is located between the demultiplexer 8 and the mixer 9, the wavelength λ1. λ.
の光信号は、それらの透孔５，７αを透過して混合器９
に入射される。したがって温合器９ではそれらの光信号
を混合し、第２光フアイバ１３を介して受光部１２に伝
送する。これにより、受光部１２では、両波長λ１．λ
２を含む光信号であることを解読し、特定気筒の点火時
期あるいは燃料噴射時期であることを読み取る。The optical signals are transmitted through the through holes 5 and 7α to the mixer 9.
is incident on the Therefore, the mixer 9 mixes these optical signals and transmits them to the light receiving section 12 via the second optical fiber 13. As a result, in the light receiving section 12, both wavelengths λ1. λ
2, and reads that it is the ignition timing or fuel injection timing for a specific cylinder.
また、分波器８および混合器９間に、透孔７ｂ。Further, a through hole 7b is provided between the duplexer 8 and the mixer 9.
７ｃ、７ｄが位置するときには、波長λ１の光のみが分
波器８から混合器９に透過し、第２光フア １イバ１３
を介して受光部１２に伝送される。これによシ、受光部
１２では波長λ、の光信号の久方により、残余の気筒の
点火時期あるいは燃料噴射時期を検出することができる
。When 7c and 7d are located, only the light with wavelength λ1 is transmitted from the demultiplexer 8 to the mixer 9, and the second optical fiber 13
It is transmitted to the light receiving section 12 via. Accordingly, the light receiving section 12 can detect the ignition timing or fuel injection timing of the remaining cylinders based on the length of the optical signal having the wavelength λ.
以上の実施例では、デイストリビユータに関連して説明
したが、本発明は回、転体の回転位置検出装置として広
（実施され得名ものである。また上述の実施例では２チ
ヤンネルの分局、回転信号を得るものとして説明したが
、本発明は３チャンネル以上の複数チャンネルの分周、
回転信号を得るためにも用いられ得る。さらに回転位置
を検出すべき部分を除く領域に透孔を穿設し、光信号が
透過しないときに回転位置を検出するようにすることも
できる。また発光部１０および受光部１２から最遠のダ
イクロイックミラー１６．２０については単なる反射鏡
に置き換えてもよい。Although the above embodiments have been described in connection with a distributor, the present invention can be widely used as a rotational position detecting device for a rotary or rotating body. , the rotation signal is obtained, but the present invention is also applicable to frequency division of multiple channels of three or more channels,
It can also be used to obtain rotation signals. Furthermore, it is also possible to provide a through hole in an area excluding the portion where the rotational position is to be detected, so that the rotational position can be detected when no optical signal passes through. Furthermore, the dichroic mirrors 16 and 20 that are farthest from the light emitting section 10 and the light receiving section 12 may be replaced with simple reflecting mirrors.
以上のように本発明によれば、回転体には、その回転軸
線を中心として異なる半径を有する複数の仮想円上に、
１または複数Ｏ透孔がそれぞれ穿設され、光信号を複数
種類に分波して前記各仮想円に対応して平行に出射する
分波器が、前記回転体の一方の面に対向して配設され、
前記各透孔を透過した複数種類の光信号を混合する混合
器が前記分波器に対応する位置で回転体の他方の面に対
向して配設され、前記分波器には発光部からの光信号を
導くための第１光フアイバが接続され、混合器には光信
号を受光部に導くための第２光フアイバが接続されるの
で、複数チャンネルの分周、回転信号を得ることかでき
、しかも発光部および受光部を任意の位置に配置するこ
とができるので、レイアウト上および素子選択上有利で
ある。As described above, according to the present invention, the rotating body has a plurality of virtual circles having different radii around the axis of rotation of the rotating body.
A demultiplexer, each having one or more O through holes, which demultiplexes the optical signal into a plurality of types and outputs the optical signals in parallel corresponding to each of the virtual circles, faces one surface of the rotating body. arranged,
A mixer for mixing a plurality of types of optical signals transmitted through each of the through holes is disposed facing the other surface of the rotary body at a position corresponding to the splitter, and the splitter has a light emitting section to a light emitting section. A first optical fiber for guiding the optical signal is connected to the mixer, and a second optical fiber for guiding the optical signal to the light receiving section is connected to the mixer, so it is possible to obtain frequency division and rotation signals of multiple channels. Furthermore, the light emitting section and the light receiving section can be arranged at arbitrary positions, which is advantageous in terms of layout and element selection.
図面は本発明の一実施例を示すもので、第１図は斜視図
、第２図は第１図の■−■線から見て簡略化した拡大断
面図である。
１・・・回転位置検出装置、３・・・回転体、４，６・
・・仮想円、５，７α〜７ｄ・・・透孔、８・・・分波
器、９・・・混合器、１０・・・発光部、１１・・・第
１光フアイバ、１２・・・受光部、１３・・・第２光フ
アイバ特許出願人 東洋電装株式会社The drawings show one embodiment of the present invention, and FIG. 1 is a perspective view, and FIG. 2 is a simplified enlarged sectional view taken along line 1--2 in FIG. DESCRIPTION OF SYMBOLS 1... Rotation position detection device, 3... Rotating body, 4, 6.
...Virtual circle, 5,7α-7d...Through hole, 8...Demultiplexer, 9...Mixer, 10...Light emitting part, 11...First optical fiber, 12...・Light receiving part, 13...Second optical fiber patent applicant Toyodenso Co., Ltd.
Claims (1)
する複数の仮想円上に、１または複数の透孔がそれぞれ
穿設され、光信号を複数種類に分波して前記各仮想円に
対応して平行に出射する分波器が、前記回転体の一方の
面に対向して配設され、前記各透孔を透過した複数種類
の光信号な温合する混合器が前記分波器に対応する位置
で回転体の他方の面に対向して配設され、前記分波器に
は発光部からの光信号を導くための第１光フアイバが接
続され、混合器には光信号を受光部に導くための第２光
フアイバが接続されることを特徴とする回転位置検出装
置。One or more through holes are formed in the rotating body on a plurality of imaginary circles having different radii around the axis of rotation, and the optical signal is split into multiple types to correspond to each of the imaginary circles. A demultiplexer that emits light in parallel is disposed opposite to one surface of the rotating body, and a mixer that heats the plurality of types of optical signals transmitted through each of the through holes is attached to the demultiplexer. A first optical fiber is disposed facing the other surface of the rotating body at a corresponding position, a first optical fiber for guiding an optical signal from a light emitting part is connected to the splitter, and a first optical fiber for receiving an optical signal is connected to the mixer. 1. A rotational position detection device, characterized in that a second optical fiber is connected thereto.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1138484A JPS60155919A (en) | 1984-01-25 | 1984-01-25 | Apparatus for detecting rotary position |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1138484A JPS60155919A (en) | 1984-01-25 | 1984-01-25 | Apparatus for detecting rotary position |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60155919A true JPS60155919A (en) | 1985-08-16 |
Family
ID=11776508
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1138484A Pending JPS60155919A (en) | 1984-01-25 | 1984-01-25 | Apparatus for detecting rotary position |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60155919A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62151761A (en) * | 1985-12-26 | 1987-07-06 | Matsushita Electric Ind Co Ltd | Speed detector |
| EP0285053A2 (en) * | 1987-03-30 | 1988-10-05 | Kollmorgen Corporation | Fiber optic sensing system and method across working air gap of an electric motor |
| JP2008261745A (en) * | 2007-04-12 | 2008-10-30 | Ojima Shisaku Kenkyusho:Kk | Detection part for encoder, and encoder |
| JP2008544838A (en) * | 2005-06-30 | 2008-12-11 | ノヴェコ インコーポレイテッド | Bactericidal air filter |
| EP2730894A1 (en) * | 2012-11-13 | 2014-05-14 | Itron GmbH | Detector, light guide and utility meter |
| KR101452364B1 (en) * | 2014-04-30 | 2014-10-22 | 주식회사 은하 | Optical encoder of electric powered valve actuator |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55132921A (en) * | 1979-04-05 | 1980-10-16 | Fujitsu Ltd | Sensor using optical fiber |
| JPS56106111A (en) * | 1980-01-29 | 1981-08-24 | Toshiba Corp | Pulse transmitter |
| JPS56149697A (en) * | 1980-04-21 | 1981-11-19 | Furukawa Electric Co Ltd | Meausred amount detecting system |
-
1984
- 1984-01-25 JP JP1138484A patent/JPS60155919A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55132921A (en) * | 1979-04-05 | 1980-10-16 | Fujitsu Ltd | Sensor using optical fiber |
| JPS56106111A (en) * | 1980-01-29 | 1981-08-24 | Toshiba Corp | Pulse transmitter |
| JPS56149697A (en) * | 1980-04-21 | 1981-11-19 | Furukawa Electric Co Ltd | Meausred amount detecting system |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62151761A (en) * | 1985-12-26 | 1987-07-06 | Matsushita Electric Ind Co Ltd | Speed detector |
| EP0285053A2 (en) * | 1987-03-30 | 1988-10-05 | Kollmorgen Corporation | Fiber optic sensing system and method across working air gap of an electric motor |
| EP0285053A3 (en) * | 1987-03-30 | 1990-03-14 | Kollmorgen Corporation | Fiber optic sensing system and method across working air gap of an electric motor |
| JP2008544838A (en) * | 2005-06-30 | 2008-12-11 | ノヴェコ インコーポレイテッド | Bactericidal air filter |
| JP2008261745A (en) * | 2007-04-12 | 2008-10-30 | Ojima Shisaku Kenkyusho:Kk | Detection part for encoder, and encoder |
| EP2730894A1 (en) * | 2012-11-13 | 2014-05-14 | Itron GmbH | Detector, light guide and utility meter |
| WO2014076100A2 (en) * | 2012-11-13 | 2014-05-22 | Itron Gmbh | Detector, light guide and utility meter |
| WO2014076100A3 (en) * | 2012-11-13 | 2014-07-17 | Itron Gmbh | Detector, light guide and utility meter |
| US9519110B2 (en) | 2012-11-13 | 2016-12-13 | Itron Gmbh | Detector, light guide and utility meter |
| KR101452364B1 (en) * | 2014-04-30 | 2014-10-22 | 주식회사 은하 | Optical encoder of electric powered valve actuator |
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