Sensing apparatus for determining the relative position between two bodies with plural emitters and a shading member

摘要

Sensing apparatus for determining the relative position between two bodies located at a distance from one another with respect to a predetermined relative position wherein one of the bodies is provided with a camera having an areal matrix of photosensitive elements arranged in the image plane of the camera and wherein the other of the bodies is provided with a shading member projecting from the surface thereof and with an optically clearly distinguishable reference pattern in the area of the base of the shading member, the reference pattern being formed by means of light sources which emit light patterns which are as punctiform as possible. The reference pattern is partially covered in an asymmetric manner by the shading member during deviation from the reference position and this deviation is sensed by the photosensitive elements in the camera.