Importance

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Abstract

Proposed for detecting the relative position of two bodies (2, 3) or surface regions of bodies is an electro-optical measuring instrument which has, in a known way, a light beam transmitter (4), which can be attached to the one body (3) or surface region and transmits a focused light beam (L), and a single-axis or multi-axis optoelectronic position detector with a light-sensitive measuring surface (5). During measurement of the bodies (2, 3) or surface regions, the light beam (L) impinges on the measuring surface (5), and its point of impingement (LA) moves over the light-sensitive surface (5), during execution of a measuring movement, in a way which is characteristic of the current mutual alignment of the bodies (2, 3) or surface regions. If the mutual alignment deviates substantially from a desired position, it can happen with the known measuring instruments of this type that without a correcting countermeasure the point of impingement (LA) of the light beam would leave the measuring surface (5) in the further course of the measuring movement. This is prevented in accordance with the invention by means of a device which carries out an extension of the measuring region while monitoring the measuring movement.

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First Claim