Patent ID: 7089672
Filing Date: 2006-08-15
Classification: G01D

Abstract:
1. An optical sensor for determining the angular displacement and the torque of a rotatable object ( 13 ), the sensor containing at least one patterned surface ( 1 ), an ASIC ( 3 ), at least one lens ( 2 ) and at least one EMR source ( 16 , 17 ), the ASIC ( 3 ) comprising processing means and an array of detectors for EMR, the at least one EMR source ( 16 , 17 ) illuminating the patterned surface ( 1 ) and the at least one lens ( 2 ) focusing a part of the reflected EMR ( 5 ) from the patterned surface ( 1 ) onto the array of detectors for EMR, wherein the patterned surface ( 1 ) contains a pattern including turning marks and laser marks ( 8 ), the at least one lens ( 2 ) focusing substantially EMR reflected by the turning marks ( 14 ) onto the array of detectors and the turning marks ( 14 ) being non-symmetrical, and wherein the EMR source ( 16 , 17 ) illuminates the patterned surface ( 1 ) under an advantageous illumination angle ( 15 ), which produces a maximum reflection intensity of EMR reflected by the non-symmetrical turning marks ( 14 ).