Patent ID: 9733069
Date: 2017-08-15
CPC Classifications: G01B,G01D

Claim:
1. An optical position-measuring device for detecting the position of two objects movable relative to each other, comprising: a measuring standard joined to one of the two objects and including a measuring graduation having a periodic arrangement of graduation regions along at least a first graduation direction; and a scanning unit including a plurality of optical elements and being movable relative to the measuring standard, arrangement and formation of the optical elements of the scanning unit adapted to produce a scanning beam path in which partial beams of rays reaching interference propagate in mirror symmetry in relation to a plane of symmetry and either fall in V-shaped fashion on the measuring standard and/or are reflected back in a V-shape by the measuring standard; wherein the plane of symmetry is tilted by a defined tilt angle about an axis of rotation oriented parallel to a surface of the measuring standard and extends in a direction perpendicular to the first graduation direction; and wherein a graduation period of the measuring graduation and the tilt angle are selected such that the scanning beam path in the scanning unit is identical to the scanning beam path in an untilted state, in which the plane of symmetry is oriented perpendicular to the surface of the measuring standard.