Optical encoder, and method of reading encoded optical signal

Details Optical encoder, and method of reading encoded optical signal Optical encoder, and method of reading encoded optical signal

G - Physics

11

B

G11B 7/125 (2006.01) G01D 5/347 (2006.01)

Patent

CA 2189207

A method of reading encoded optical signal including the steps of: i) driving a light source to produce a light beam, ii) using a lens to focus the light beam of the light source onto a receiving face of a crystal of a phototransistor by a lens, and iii) chopping off the energy of the light from the light beam which surpasses the rated working voltage of the phototransistor, and disregarding from judgment the potential of the light beam which is below a predetermined critical level, so as to obtain a signal approximately equal to a square wave.

Méthode de lecture d'un signal optique codé. Comprend les étapes suivantes : i) produire un faisceau lumineux au moyen d'une source lumineuse, ii) utiliser une lentille pour concentrer le faisceau lumineux sur une face réceptrice d'un cristal d'un phototransistor, et iii) retrancher du faisceau lumineux l'énergie lumineuse qui dépasse la tension nominale de service du phototransistor, et négliger le potentiel du faisceau lumineux qui est inférieur à un niveau critique prédéterminé, de façon à obtenir un signal environ égal à une onde carrée.

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