Optical encoder

G - Physics – 01 – D

Patent

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Details

G01D 5/347 (2006.01)

Patent

CA 2740250

The invention relates to the optical encoders that supply binary logic signals representing the relative position increments of two elements (10, 11) of the encoder, the two elements being mobile relative to one another. The first element (10) bears at least one mark (16) and the second element (11) bears a pair of detection cells (17, 18) for detecting the mark (16). According to the invention, the dimensions of the mark (16) are defined so that said mark can be detected either by neither of the two cells (17, 18), or by a single cell (17, 18) or by both cells (17, 18). The invention is well suited to angular encoders, it makes it possible to widen the manufacturing tolerances of the marks (16) on the first element (10) and on the relative position of the two cells (17, 18).

L'invention concerne les codeurs optiques fournissant des signaux logiques binaires représentant les incréments de position relative de deux éléments (10, 11) du codeur, les deux éléments étant mobiles l'un par rapport à l'autre. Le premier élément (10) porte au moins une marque (16) et le second élément (11) porte une paire de cellules de détection (17, 18) de la marque (16). Selon l'invention, les dimensions de la marque (16) sont définies de façon à pouvoir être détectée soit par aucune des deux cellules (17, 18), soit par une seule cellule (17, 18) soit par les deux cellules (17, 18). L'invention est bien adaptée aux codeurs angulaires, elle permet d'élargir les tolérances de fabrication des marques (16) sur le premier élément (10) et sur la position relative des deux cellules (17, 18).

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