Optical position-measuring device

An optical position-measuring device for determining the position of a first object relative to a second object which is movable relative to the first object along at least one measurement direction, the optical position-measuring device comprising:

• a scale connected to the first object and extending along the measurement direction, the scale including at least one measuring graduation composed of graduation regions which are alternately arranged along the measuring direction and have different optical properties;
• and
• a scanner connected to the second object and including at least one light source, a detector array and at least one fiber-optic array including a plurality of optical fibers arranged adjacent one another, the fiber-optic array being configured as a fiber-optic plate having an image-input face that faces the scale and an image-output face that faces the detector array;
• a light pattern resulting from interaction of beams emitted by the light source with the measuring graduation, the fiber-optic array transmitting the light pattern into a detection plane of the detector array;
• and
• an interstitial medium disposed between the image-output face of the fiber-optic plate and the detector array so as to ensure that an amount of deflection that the beams exiting the image-output face undergo on a path to the detector array is smaller than in a case without the interstitial medium.