Rotary encoder system
AssigneeESPROS Photonics AG
InventorBeat De Coi
Life of this patent
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Abstract
A rotary encoder system for registering the rotary angle position and/or angular speed of a rotary shaft which extends along an axis of rotation, including at least two optical marks at the rotary shaft, an optical sensor with a pixel matrix having pixel points, an imaging device for imaging each mark in a substantially axial direction on the pixel matrix as a mark image, and an evaluation device for reading and evaluating the pixel matrix in order to determine data in relation to the rotary angle position and/or angular speed. Further, the marks, the imaging device and pixel points are embodied in such a way that the mark images on the pixel matrix have at least the area of a pixel point, and the evaluation device is embodied to establish the location of the centroids of the mark images on the pixel matrix.
Claims20
A rotary encoder system for registering the rotary angle position and/or angular speed of a rotary shaft which extends along an axis of rotation, comprising:
- at least two optical marks at the rotary shaft,
- an optical sensor with a pixel matrix having pixel points,
- an imaging device for imaging each mark in a substantially axial direction on the pixel matrix as a mark image, and
- an evaluation device for reading and evaluating the pixel matrix in order to determine data in relation to the rotary angle position and/or angular speed,
- wherein the marks, the imaging device and pixel points are embodied in such a way that the mark images on the pixel matrix have at least the area of a pixel point,
- wherein the evaluation device is embodied to establish the location of the centroids of the mark images on the pixel matrix with sub-matrix division.
Dependencies are inferred from the claim text.