Apparatus for detecting proximity between a first object (target object) and a second object (reference object), comprising a light source and a light detector adapted to receive resulting back-scattered light from the reference object when illuminated fro...

An optical displacement measurement device (10) for introducing light from a light source (20) to an object (2) through an optical system having an objective lens (28) and for detecting light reflected from the object by a detection section (30) to thereby...