DE19750474A1 - Rotation transmitter, for angle measurement - Google Patents
Rotation transmitter, for angle measurementInfo
- Publication number
- DE19750474A1 DE19750474A1 DE1997150474 DE19750474A DE19750474A1 DE 19750474 A1 DE19750474 A1 DE 19750474A1 DE 1997150474 DE1997150474 DE 1997150474 DE 19750474 A DE19750474 A DE 19750474A DE 19750474 A1 DE19750474 A1 DE 19750474A1
- Authority
- DE
- Germany
- Prior art keywords
- shaft
- bore
- light
- light transmitter
- encoder according
- 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.)
- Granted
Links
- 238000005259 measurement Methods 0.000 title description 2
- 239000002184 metal Substances 0.000 description 4
- 239000011521 glass Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
- G01P3/486—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by photo-electric detectors
-
- 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
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optical Transform (AREA)
Abstract
Description
Die Erfindung betrifft einen Drehgeber, der nach dem Durch licht-Abtastprinzip arbeitet, gemäß dem Oberbegriff des An spruchs 1.The invention relates to an encoder, which after the light scanning principle works according to the preamble of the An saying 1.
Bei Drehgebern dieser Gattung trägt eine lichtdurchlässige Teilscheibe eine Winkelmaßverkörperung. Auf einer Seite der Scheibe ist ein Lichtsender angeordnet, während auf der entge gengesetzten Seite ein fotoelektrischer Abtastempfänger an geordnet ist. Das von dem Lichtsender ausgesandte Licht wird durch die Winkelmaßverkörperung der Teilscheibe moduliert. Der Abtastempfänger wandelt die modulierten Lichtsignale in elek trische Meßsignale um. Die Winkelmaßverkörperung kann inkre mental oder absolut kodiert ausgebildet sein. Drehgeber dieser Art werden insbesondere zur Messung des Winkels und/oder der Winkelgeschwindigkeit eingesetzt.Encoders of this type have a translucent one Partial disc an angular measure. On one side of the Disk is arranged a light transmitter, while on the opposite opposite side to a photoelectric scanning receiver is ordered. The light emitted by the light transmitter becomes modulated by the angular scale of the index plate. Of the Scanning receiver converts the modulated light signals into electrical trical measurement signals. The angle measure can be incorrect be mentally or absolutely coded. Encoder this Kind are used in particular to measure the angle and / or the Angular velocity used.
Bei den bekannten Drehgebern ist die Teilscheibe drehfest mit einer Welle verbunden, deren Winkelstellung zu messen ist. Dies kann entweder die Welle eines Motors sein oder eine Ein gangswelle des Drehgebers, die mit der Motorwelle gekuppelt wird. Die Winkelmaßverkörperung ist auf der Teilscheibe kon zentrisch um die Welle angeordnet. Der Lichtsender und der Abtastempfänger sind achsparallel zu der Welle angeordnet. Bei diesen bekannten Drehgebern weist dementsprechend die Teil scheibe einen Radius auf, der um zumindest die radiale Breite der Winkelmaßverkörperung größer ist als der Radius der Welle. Bei hohen Drehzahlen ergeben sich deshalb hohe Zentrifugal kräfte, die auf die Teilscheibe wirken. Diese Zentrifugal kräfte können zu einer Zerstörung der aus Glas oder Kunststoff bestehenden Teilscheibe führen, so daß der Drehgeber aus Grün den der Betriebssicherheit nur bis zu einer begrenzten Dreh zahl verwendet werden kann.In the known rotary encoders, the indexing disk is non-rotatable connected to a shaft whose angular position is to be measured. This can either be the shaft of an engine or an on gear shaft of the encoder, which is coupled to the motor shaft becomes. The angular scale is con arranged centrally around the shaft. The light transmitter and the Scanning receivers are arranged axially parallel to the shaft. At these known encoders accordingly have the part slice a radius that is at least the radial width the angular measure is larger than the radius of the shaft. At high speeds, this results in high centrifugal forces forces acting on the index plate. This centrifugal Forces can destroy the glass or plastic guide existing indexing disk so that the encoder is green that of operational security only up to a limited rotation number can be used.
Aus der DE 93 21 318 U1 ist es bekannt, die aus Glas oder Kunststoff bestehende Teilscheibe des Drehgebers mit einem Metallring einzufassen, der die Zentrifugalkräfte bei hohen Drehzahlen abstützt. Das Aufbringen des Metallringes ist auf wendig. Zudem erzeugt der am Außenumfang der Teilscheibe an geordnete Metallring seinerseits Zentrifugalkräfte.From DE 93 21 318 U1 it is known that made of glass or Plastic encoder disc with a Border metal ring that the centrifugal forces at high Speeds supported. The metal ring is on agile. It also creates on the outer circumference of the indexing disc orderly metal ring in turn centrifugal forces.
Der Erfindung liegt die Aufgabe zugrunde, einen Drehgeber, der nach dem Durchlicht-Abtastprinzip arbeitet, zur Verfügung zu stellen, der sich auch für hohe Drehzahlen eignet.The invention has for its object a rotary encoder works on the transmitted light scanning principle places that are also suitable for high speeds.
Diese Aufgabe wird erfindungsgemäß gelöst durch einen Dreh geber mit den Merkmalen des Anspruchs 1.According to the invention, this object is achieved by a rotation donor with the features of claim 1.
Vorteilhafte Ausführungen und Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben.Advantageous embodiments and developments of the invention are specified in the subclaims.
Der Grundgedanke der Erfindung besteht darin, den Drehgeber in der Achse der rotierenden Welle anzuordnen. Die Winkelmaß verkörperung der Teilscheibe und der Lichtsender befinden sich nicht außerhalb des Umfangs der Welle. Der Lichtsender ist vielmehr innerhalb der Welle angeordnet und die Teilscheibe ist konzentrisch in die Welle eingesetzt.The basic idea of the invention is the encoder in to arrange the axis of the rotating shaft. The angle measure Embodiment of the index plate and the light transmitter are located not outside the circumference of the shaft. The light transmitter is rather arranged inside the shaft and the indexing disk is inserted concentrically in the shaft.
Diese Anordnung ergibt wesentliche Vorteile. Der Durchmesser der Teilscheibe ist wesentlich reduziert. Dadurch ergibt sich eine erhebliche Verringerung der auf die Teilscheibe wirkenden Zentrifugalkräfte. Der Drehgeber kann mit erheblich höheren Drehzahlen betrieben werden, bevor Zentrifugalkräfte auftre ten, die zu einer Beschädigung der Teilscheibe führen können.This arrangement gives significant advantages. The diameter the index plate is significantly reduced. This results in a significant reduction in the acting on the indexing disc Centrifugal forces. The encoder can be used with significantly higher Speeds are operated before centrifugal forces occur that can damage the indexing disk.
Da die Teilscheibe in die Welle eingesetzt ist, wird die Teilscheibe an ihrem Außenumfang von der Welle umfaßt. Die Teilscheibe wird somit an ihrem Außenumfang durch die Welle abgestützt, ohne daß ein zusätzlicher Metallring angebracht werden muß. Dadurch ist der Aufbau des Drehgebers einfacher und seine Herstellung kostengünstiger. Außerdem erhöht die Abstützung der Teilscheibe an ihrem Außenumfang durch die Welle die zulässigen Drehzahlen. Der Geber kann problemlos bis zu Drehzahlen von etwa 100.000 Umdrehungen pro Minute einge setzt werden.Since the indexing disc is inserted into the shaft, the Partial disc on its outer periphery encompassed by the shaft. The Partial disk is thus on its outer circumference by the shaft supported without an additional metal ring attached must become. This makes it easier to set up the encoder and its manufacture more cost-effectively. It also increases the Support of the index plate on its outer circumference by the Shaft the permissible speeds. The encoder can easily up to at speeds of approximately 100,000 revolutions per minute be set.
Die durch die koaxiale Anordnung des Drehgebers in der Welle bedingten geringen Durchmesserabmessungen machen den Drehgeber insbesondere auch für die Verwendung bei kleinsten Motoren geeignet. Der Außendurchmesser des Drehgebers kann beispiels weise nur etwa 20 mm betragen.Due to the coaxial arrangement of the encoder in the shaft Conditional small diameter dimensions make the encoder especially for use with the smallest motors suitable. The outside diameter of the encoder can be, for example be only about 20 mm.
Im folgenden wird die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert. Die ein zige Figur zeigt den Drehgeber schematisch im Axialschnitt.In the following the invention with reference to one in the drawing illustrated embodiment explained in more detail. The one Zige figure shows the encoder schematically in axial section.
Der Drehgeber weist eine rotierende Welle 10 auf, die z. B. die Welle eines Motors sein kann oder mit der Welle eines Motors drehfest gekuppelt wird. In der freien Endstirnfläche der Welle 10 ist koaxial eine Bohrung vorgesehen. Im Grund der Bohrung ist koaxial zur Welle 10 eine Lichtquelle 12 angeord net. Vor der Lichtquelle 12 ist in die Bohrung eine Kollima torlinse 14 eingesetzt, die das von der Lichtquelle 12 ausge sandte Licht parallel bündelt. In der Endstirnfläche der Welle 10 ist in die Bohrung konzentrisch eine Teilscheibe 16 aus Glas oder einem lichtdurchlässigen Kunststoff eingesetzt, die eine Winkelmaßverkörperung trägt.The encoder has a rotating shaft 10 which, for. B. can be the shaft of a motor or is rotatably coupled to the shaft of a motor. A bore is provided coaxially in the free end face of the shaft 10 . In the bottom of the bore, a light source 12 is arranged coaxially to the shaft 10 . In front of the light source 12 , a collimator lens 14 is inserted into the bore, which bundles the light sent out from the light source 12 in parallel. In the end face of the shaft 10 , a graduated disk 16 made of glass or a translucent plastic is inserted concentrically into the bore and bears an angular scale.
Das freie Ende der Welle 10 sitzt mittels eines Radialkugella gers 18 drehbar gelagert in einem Gehäuse 20. Das Gehäuse 20 ist in nicht dargestellter, an sich bekannter Weise über eine Kupplung verdrehfest aber radial und axial elastisch nach gebend gelagert, z. B. mit dem Gehäuse des Motors verbunden, dessen Welle mittels des Drehgebers gemessen wird.The free end of the shaft 10 is seated by means of a Radialkugella gers 18 rotatably mounted in a housing 20. The housing 20 is in a manner not shown, known per se via a coupling but radially and axially elastically resiliently mounted, for. B. connected to the housing of the motor, the shaft of which is measured by means of the rotary encoder.
Axial vor der Endstirnfläche der Welle 10 und damit vor der Teilscheibe 16 ist ein Abtastempfänger 22 fest in dem Gehäuse 20 angeordnet. Der Abtastempfänger 22 weist vorzugsweise lichtempfindliche Sensorelemente auf, die entsprechend der Winkelmaßverkörperung der Teilscheibe 16 zur Achse der Teilscheibe 16 konzentrisch angeordnet sind. Das von der Lichtquelle 12 ausgesandte und durch die Kollimatorlinse 14 kollimierte Licht tritt durch die Teilscheibe 16 hindurch und wird durch die Winkelmaßverkörperung der Teilscheibe 16 modu liert. Der feststehende Abtastempfänger 22 empfängt das modu lierte Lichtsignal der sich mit der Welle 10 drehenden Teil scheibe 16 und wandelt dieses in entsprechende elektrische Signale um, die zur Auswertung der Winkelstellung der Welle 10 verwendet werden.A scanning receiver 22 is arranged axially in front of the end face of the shaft 10 and thus in front of the indexing disk 16 in the housing 20 . The scanning receiver 22 preferably has photosensitive sensor elements which are arranged concentrically to the axis of the indexing disk 16 in accordance with the angular scale of the indexing disk 16 . The light emitted from the light source 12 and collimated by the collimator lens 14 light passes through the code wheel 16 passes, and is profiled by the Winkelmaßverkörperung of index wheel 16 modu. The fixed scanning receiver 22 receives the modulated light signal of the rotating disk part 16 with the shaft 10 and converts this into corresponding electrical signals that are used to evaluate the angular position of the shaft 10 .
Um die Lichtquelle 12, die sich in der Welle 10 befindet und mit dieser rotiert, elektrisch zu speisen, ist um die Welle 10 eine Statorspule 24 gelegt, die mit einer in der Welle 10 angeordneten und mit der Welle 10 rotierenden Rotorspule 26 zusammenwirkt, um einen die Lichtquelle 12 speisenden Genera torstrom zu erzeugen. Alternativ ist eine Stromspeisung der Lichtquelle 12 über Schleifkontakte möglich.In order to electrically feed the light source 12 , which is located in the shaft 10 and rotates with it, a stator coil 24 is placed around the shaft 10 , which cooperates with a rotor coil 26 arranged in the shaft 10 and rotating with the shaft 10 to generate a gate current feeding the light source 12 . Alternatively, the light source 12 can be supplied with current via sliding contacts.
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1997150474 DE19750474C2 (en) | 1997-11-14 | 1997-11-14 | Encoder |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1997150474 DE19750474C2 (en) | 1997-11-14 | 1997-11-14 | Encoder |
Publications (2)
Publication Number | Publication Date |
---|---|
DE19750474A1 true DE19750474A1 (en) | 1999-06-02 |
DE19750474C2 DE19750474C2 (en) | 2000-08-10 |
Family
ID=7848730
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1997150474 Expired - Lifetime DE19750474C2 (en) | 1997-11-14 | 1997-11-14 | Encoder |
Country Status (1)
Country | Link |
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DE (1) | DE19750474C2 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1452836A1 (en) * | 2003-02-27 | 2004-09-01 | Stegmann GmbH & Co. KG | Angular displacement sensing apparatus |
CN100365389C (en) * | 2005-10-14 | 2008-01-30 | 清华大学 | Switching digital angle displacement sensor and use thereof |
EP1890113A1 (en) * | 2006-08-18 | 2008-02-20 | Leica Geosystems AG | Optoelectronic angle sensor and method for determining a rotation angle around an axis |
EP2498076A1 (en) | 2011-03-11 | 2012-09-12 | Hexagon Technology Center GmbH | Wear-Monitoring of a Gearbox in a Power Station |
EP2607847A3 (en) * | 2011-12-19 | 2013-12-18 | Kabushiki Kaisha TOPCON | Rotation angle detecting apparatus and surveying instrument |
EP2607845A3 (en) * | 2011-12-19 | 2014-01-01 | Kabushiki Kaisha TOPCON | Rotation angle detecting apparatus and surveying instrument |
EP2657654A3 (en) * | 2012-04-26 | 2017-10-18 | Kabushiki Kaisha Topcon | Rotation angle detecting apparatus |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10063899B4 (en) * | 2000-12-21 | 2006-01-05 | Sick Stegmann Gmbh | Optical angle measuring system |
DE10229246B4 (en) | 2002-06-28 | 2004-05-27 | Stegmann Gmbh & Co. Kg | Optoelectronic angle measuring device and method for its production |
DE10308683B3 (en) * | 2003-02-28 | 2004-04-08 | Stegmann Gmbh & Co. Kg | Multiple rotation rotary source for industrial regulation and control has sensor unit for recording number of shaft rotations provided with magnetic switch element with coil for suppressing its operation |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4013936A1 (en) * | 1990-04-30 | 1991-10-31 | Dieter Rippel | Optical absolute encoder for measuring angular increments - uses image information mask cooperating with CCD sensor or LED array |
DE4310405C1 (en) * | 1993-03-31 | 1994-09-08 | Deutsche Aerospace | Optical tap |
DE19506019A1 (en) * | 1995-02-22 | 1996-09-05 | Telefunken Microelectron | Operating optical steering angle stationary sensor with several optical elements |
-
1997
- 1997-11-14 DE DE1997150474 patent/DE19750474C2/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4013936A1 (en) * | 1990-04-30 | 1991-10-31 | Dieter Rippel | Optical absolute encoder for measuring angular increments - uses image information mask cooperating with CCD sensor or LED array |
DE4310405C1 (en) * | 1993-03-31 | 1994-09-08 | Deutsche Aerospace | Optical tap |
DE19506019A1 (en) * | 1995-02-22 | 1996-09-05 | Telefunken Microelectron | Operating optical steering angle stationary sensor with several optical elements |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7041961B2 (en) | 2003-02-27 | 2006-05-09 | Sick Stegmann Gmbh | Device for measurement of rotational angle of two components relative to each other |
EP1452836A1 (en) * | 2003-02-27 | 2004-09-01 | Stegmann GmbH & Co. KG | Angular displacement sensing apparatus |
CN100365389C (en) * | 2005-10-14 | 2008-01-30 | 清华大学 | Switching digital angle displacement sensor and use thereof |
US8462979B2 (en) * | 2006-08-18 | 2013-06-11 | Leica Geosystems Ag | Optoelectronic angle sensor and method for determining a rotational angle about an axis |
EP1890113A1 (en) * | 2006-08-18 | 2008-02-20 | Leica Geosystems AG | Optoelectronic angle sensor and method for determining a rotation angle around an axis |
WO2008019855A1 (en) * | 2006-08-18 | 2008-02-21 | Leica Geosystems Ag | Optoelectronic angle sensor and method for determining a rotational angle about an axis |
US20110044561A1 (en) * | 2006-08-18 | 2011-02-24 | Leica Geosystems Ag | Optoelectronic angle sensor and method for determining a rotational angle about an axis |
CN101501455B (en) * | 2006-08-18 | 2011-11-09 | 莱卡地球系统公开股份有限公司 | Optoelectronic angle sensor |
US8242434B2 (en) | 2006-08-18 | 2012-08-14 | Leica Geosystems, Ag | Optoelectronic angle sensor for determining a rotational angle about an axis and including a code carrier having a planar self-luminous coding |
EP2498076A1 (en) | 2011-03-11 | 2012-09-12 | Hexagon Technology Center GmbH | Wear-Monitoring of a Gearbox in a Power Station |
WO2012123351A1 (en) | 2011-03-11 | 2012-09-20 | Hexagon Technology Center Gmbh | Wear-monitoring of a gearbox in a power station |
US9915585B2 (en) | 2011-03-11 | 2018-03-13 | Hexagon Technology Center Gmbh | Wear-monitoring of a gearbox in a power station |
EP2607847A3 (en) * | 2011-12-19 | 2013-12-18 | Kabushiki Kaisha TOPCON | Rotation angle detecting apparatus and surveying instrument |
EP2607845A3 (en) * | 2011-12-19 | 2014-01-01 | Kabushiki Kaisha TOPCON | Rotation angle detecting apparatus and surveying instrument |
US8836930B2 (en) | 2011-12-19 | 2014-09-16 | Kabushiki Kaisha Topcon | Rotation angle detecting apparatus and surveying instrument |
US9541382B2 (en) | 2011-12-19 | 2017-01-10 | Kabushiki Kaisha Topcon | Rotation angle detecting apparatus and surveying instrument |
EP2657654A3 (en) * | 2012-04-26 | 2017-10-18 | Kabushiki Kaisha Topcon | Rotation angle detecting apparatus |
Also Published As
Publication number | Publication date |
---|---|
DE19750474C2 (en) | 2000-08-10 |
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Owner name: STEGMANN GMBH & CO. KG, 78166 DONAUESCHINGEN, DE |
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R071 | Expiry of right |