METHOD OF SCALE MANUFACTURE WITH LASER AND SENSOR AND FEEDBACK MEANS FOR PRODUCING SCALE MARKING WITH DESIRED DEPTH

摘要

The present invention relates to an apparatus for the manufacture of a metrological scale comprises a scale substrate (18) , at least one laser (20) for producing scale markings on the scale substrate (18) , a sensor (30) to detect the depth of the scale markings produced on the scale substrate (18) , and a feedback system which uses data from the sensor (30) to adjust parameters of the system to produce scale markings with the desired depth.