Position measuring device for detecting the relative position of a scanning unit, comprising at least one scanning grating unit, a deviating element in the form of a ridge prism, and a plurality of optoelectric detectors

摘要

Position measurement device, has at least one scan grating unit, a ridge prism an a quantity of optoelectric detectors. The operation of the ridge prism is orientated parallel to the measuring direction and acts as a retro-reflector in a direction which is perpendicular oriented in relation to the measuring direction in the plane of scale.