LIGHT-EMITTING TABLE SUITABLE FOR USE IN METROLOGY, AND COORDINATE MEASURING MACHINE HAVING SUCH A LIGHT-EMITTING TABLE

摘要

A light-emitting table suitable for use in metrology includes a plurality of light sources and a field to be illuminated. Light-emitting centers of the light sources represent starting points of light source axes which perpendicularly intersect the field to be illuminated. The light-emitting centers of the light sources on one side and the field to be illuminated on the other side delimit an intermediate space in the interior of the light-emitting table. Located between the light source axes within the intermediate space are curved and mirrored surfaces, the focal points or caustics (K) of which are located within the intermediate space between the curved and mirrored surfaces and the field to be illuminated. A coordinate measuring machine for capturing the coordinates of a workpiece includes at least one optical sensor and a light-emitting table for illuminating the workpiece during measurement of the coordinates of the workpiece using the sensor.

主权项

1. A light-emitting table configured for use in metrology, the light-emitting table comprising:
a plurality of light sources each having a light-emitting center representing a starting point of a light source axis and configured to output illumination light; the light-emitting table defining a field to be illuminated and a table interior; said light source axes perpendicularly intersecting said field to be illuminated; said light-emitting centers of said light sources and said field to be illuminated conjointly defining an intermediate space therebetween in said table interior; a plurality of first curved and mirrored surfaces disposed between each two mutually adjacent ones of said light source axes within said intermediate space; said first curved and mirrored surfaces defining respective focal points or caustics (K) disposed within said intermediate space between said curved and mirrored surfaces and said field to be illuminated; said light sources being arranged in parallel in a regular first pattern with each two mutually adjacent ones thereof conjointly defining a spacing therebetween lying in a range of 0.2 cm to 4 cm; said first curved and mirrored surfaces being arranged in a second pattern corresponding to said first pattern with a lateral offset to said light sources and said light source axes so as to define free regions adjacent said first curved and mirrored surfaces through which the illumination light can pass to be disposed around said light source axes; said free regions around said light sources defining respective primary light channels along corresponding ones of said light source axes starting at corresponding ones of said light sources; a plurality of second curved and mirrored surfaces each configured to be partially mirrored and to reflect a respective proportion of said illumination light out of said primary light channels toward a corresponding one of said first curved and mirrored surfaces at angles up to 50° with respect to the corresponding one of said light source axes; and, said second curved and mirrored surfaces being disposed in said primary light channels between said first curved and mirrored surfaces and said field to be illuminated.