Position determining probe

摘要

PCT No. PCT/GB92/01367 Sec. 371 Date May 19, 1994 Sec. 102(e) Date May 19, 1994 PCT Filed Jul. 24, 1992 PCT Pub. No. WO93/02335 PCT Pub. Date Feb. 4, 1993A probe for a position determining apparatus includes a sensing space and a movable stylus supported for three-dimensional position determining movement which extends into the space. A device emits sensing radiation into the space and a collector collects the sensing radiation from the space. A deflector is supported on the stylus within the space to deflect emitted sensing radiation and is movable with position determining movement of the stylus. The deflector concentrates the sensing radiation and the collector is sensitive to variations in the intensity distribution of collected deflected radiation which occur due to the three-dimensional movement of the stylus.