Patent ID: 6535290
Filing Date: 2003-03-18
Classification: G01B

Abstract:
A position measuring device for determining a position of two parts movable relative to one another in a measuring direction comprising:a light source for supplying a beam of light; a beam-splitter element for splitting the beam into at least a first beam component and a second beam component; a reference reflector arranged in a stationary mount in a reference ray path, the reference reflector for receiving the first beam component; a measuring reflector arranged in a measuring ray path and movable in the measuring direction, the measuring reflector for receiving the second beam component; a scanning unit arranged at one of the reference reflector and the measuring reflector providing a scanning or reference pulse signal; and at least one reference marking capable of being scanned by the scanning unit so as to produce a reference pulse signal, the at least one reference marking being arranged at the other of the reference reflector and the measuring reflector.