Patent ID: 6097319
Filing Date: 2000-08-01
Classification: G01D,G06F

Abstract:
A quadrature encoding device, which comprises:a light source for generating a light beam;a photo detector which generates an opto-electrical signal in response to the light beam from the light source;a turning disk with a plurality of slots formed substantially at equal intervals on the rim thereof, which allows the light beam from the light source to pass therethrough in an intermittent manner when the turning disk is being turned to rotate; anda slope-triggered digitizing circuit which generates a square-wave signal in response to the opto-electrical signal generated by the photo detector, in such a manner that when the current slope of the waveform of the opto-electrical signal is positive, the slope-triggered digitizing circuit producing a first voltage output; and when negative, the slope-triggered digitizing circuit producing a second voltage output.