Verfahren zur Lagebestimmung eines Positionierkörpers relativ zu einem Bezugskörper und Vorrichtung zur Durchführung des Verfahrens

摘要

The description relates to a process for determining the location of a positioning body in relation to a reference body and a device for implementing it. The positioning body (10) bears a scale with evenly spaced markings and the reference body comprises a scanner (12) with a projection surface on which the mark (16) of the scale are projected and imaging optics. The co-ordinates of the centre of projection of the imaging optics are calculated by evaluating the mark (16) arranged on the scale. Here, coded marks of two perpendicular surface scales of the scale or the positioning body are decoded and at least four centres of intersection regions of the marks of both surface scales confining an area are determined. The calculation is made via the projective relationship between the projection surface of the scanner and the plane of the scale bearing the marks.