Patent ID: 9395175
Filing Date: 2016-07-19
CPC Classification: G01B

Claim Text:
1. Apparatus for ascertaining the position of a first mechanical element and of a second mechanical element relative to one another, comprising: a first measurement unit having a first mounting device constructed to enable mounting of the first measurement unit on the first mechanical element, a light source which is able to generate spectrally different first and second light ray beams in substantially the same direction, and a position-sensitive optical detector, a second measurement unit having a second mounting device constructed to enable mounting of the second measurement unit on the second mechanical element, the second measurement unit having a reflector arrangement which faces the first measurement unit when the measurement units are mounted on the respective mechanical element in order to reflect the first and second light ray beams onto the optical detector, a surface of reflector arrangement facing the first measurement unit being configured as a color splitter that is able to reflect the first light ray beam to a greater extent than the second light ray beam and is able to transmit the second light ray beam to a greater extent than the first light ray beam, at least a rearward surface of the reflector arrangement being able to reflect the transmitted second light ray beam through the surface facing the first measurement unit, wherein the evaluation unit is configured to ascertain the position of the first and second mechanical elements relative to one another from positions of impingement of the reflected first and second light ray beams on the detector, and wherein said light source is a dual wave laser diode or two separate parallel laser diodes which are arranged next to one another.