Patent ID: 8675211
Filing Date: 2014-03-18
Classification: G01V

Abstract:
1. A position detecting device comprising: a moving part provided with vanes (F a fork light barrier for detecting movement of the moving part, wherein the fork light barrier is arranged along the movement direction of the moving part, and wherein the fork light barrier comprises: at least one light-emitting element on a limb of the fork light barrier, said element emitting light to an opposing limb during operation; at least one first, one second and one third light sensor (FT wherein the second light sensor (FT wherein a separation (L wherein the fork light barrier and the moving part are arranged such that the movement of the moving part causes the windows and vanes to move between the limbs, a first light incidence state from the at least one light-emitting element onto either only the first sensor (FT wherein the first incidence state is a light incidence interruption or a light incidence resumption, and the second incidence state is a simultaneous light incidence interruption or a simultaneous light incidence resumption.