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7324212 |
Optical encoder having slanted optical detector elements for harmonic suppression
An optical encoder includes a source of a light beam, an optical grating that generates a spatial pattern of interference fringes, and an optical detector which includes generally elongated...
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EP1380815A2 |
Position detection apparatus
A position detection apparatus including a detection unit for an absolute track including a plural number of ABS heads for absolute track, in which the separation between neighboring heads is...
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6151128 |
Optical position indicator
An optical position measuring system that has a scale graduation with a graduation period, TP, and connected with a first object that has a graduation and a scanning unit connected to a second...
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6018881 |
Position measuring system
A position measuring system that includes a scale graduation and a scanning element, wherein the scanning element moves relative to the scale graduation along a measurement direction so as to...
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5956659 |
Arrangement and method for the automatic correction of error-containing scanning signals of incremental position-measuring devices
An arrangement as well as a method for the automatic correction of error-containing scanning signals, which contain defined deviations from the ideal signal shape, of incremental position measuring...
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5920494 |
Method and device for varying interpolation factors
A method and device for varying interpolation factor of at least one position-dependent, periodic signal in a position measurement system. The method and device allows switching between one of a...
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EP0320589B2 |
Position-measuring device with several detectors
Abstract of EP0320589 In such a position measuring device for measuring the relative position between two objects, the division (WTa) of a division carrier (TTa) connected to one object is scanned...
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5726445 |
Device for obtaining harmonic-free signals
A scanning graduation that scans a scale along a measuring direction to produce a signal representative of a position measurement value. The scanning graduation includes a particular transmission...
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5590059 |
Position encoder system which utilites the fundamental frequency of a ruled scale on an object
A position encoder system is disclosed for determining the position of an object. The system includes a camera, a ruled scale, and a control system. The system first obtains a pixel brightness...
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5583798 |
Position measuring method and apparatus for generating periodic signals free of harmonics
A position measuring method and apparatus for obtaining signals substantially free of harmonics with the aid of a periodic graduation and a non-periodic or aperiodic scanning graduation, wherein...
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5576537 |
Photoelectric position measuring system using gratings having specified dimensions to suppress harmonics
A light source which emits light in strips is provided for illuminating a scale of a photoelectric position measuring system. The light modulated by the scale is converted into a sinusoidal...
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5066953 |
Position measuring apparatus with a subdivision circuit for subdividing sinusoidal scanning signals
In a position measuring apparatus there is provided a subdivision circuit for the subdividing of sinusoidal scanning signals. The subdivision circuit includes rectifier circuits in which the...
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4949289 |
Interpolation apparatus
An apparatus for determining values of a periodic function by interpolation which comprises a reading device for receiving scanning signals A,B,C,D nominally in phase quadrature with each other...
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4782229 |
Photoelectric displacement measuring device for obtaining harmonic free signals
A photoelectric measuring system for detecting an oscillation pattern produced by a light measuring apparatus and generating harmonic free electrical output signals up to a predetermined band...
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4779211 |
Position sensor
A position sensor has a detector having a plurality of sensitive elements which are acted on by indicia of a scale so that each sensitive element detects overlap between itself and one or more...
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