Optical angular encoder

Details Optical angular encoder Optical angular encoder

H - Electricity

03

M

H03M 11/26 (2006.01) G01D 5/244 (2006.01) G01D 5/245 (2006.01) G01D 5/347 (2006.01) H03M 1/30 (2006.01)

Patent

CA 2503148

The invention concerns a method for controlling the reliability of data supplied by a dual optical angular encoder comprising two pairs of cells (C1, C2, C'1, C'2) for detecting marks borne by a disc (12), which consists in: comparing at a given time the sequences of at least four successive states taken from the two groups of cells prior to said time and validating the incrementation or decrementation indications given by the two groups if the sequence for one group is either identical or phase-shifted by at least one state, ahead or behind, relative to the sequence of the other group.

Pour contrôler la fiabilité des informations fournies par un codeux angulaire optique double, comportant deux paires de cellules (C1, C2, C~1, C~2) de détection de marques portées par un disque (12), on compare à un instant donné les séquences d~au moins quatre états successifs pris par les deux groupes de cellules avant cet instant et on valide les indications d~incrémentation ou décrémentation données par les deux groupes si la séquence pour un groupe est soit identique soit déphasée d~au plus un état, en avance ou en retard, par rapport à la séquence de l~autre groupe.

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