Measuring device with a reduced share of stray light

摘要

A device for measurement by means of a light ray is equipped with a covering device for reducing stray light. The device comprises an array of lenses along an optical axis; a prism attached to one of the lenses with a slanted surface for coupling of the light ray incident from a light source placed lateral to the optical axis, onto the optical axis, so that the light ray can pass through the array of lenses along the optical axis; a receiver for receipt of a share of the light ray reflected by an object; and a covering device for at least one area of the prism that scatters a share of the light ray as stray light to the receiver.

主权项

1. A device for measurement by means of a light ray, the device including:
an array of lenses along an optical axis; a prism attached to one of the lenses, the prism having a slanted surface for coupling of the light ray from a light source placed lateral to the optical axis onto the optical axis, wherein the slanted surface includes a canted edge; a receiver for receipt of a share of the light ray reflected from an object; and a covering device for at least one area of the prism, wherein the covering device is disposed adjacent to the slanted surface of the prism and covers the slanted surface by extending substantially parallel to the slanted surface, wherein the covering device projects past an edge of the slanted edge to block light reflecting off the canted edge from reaching the receiver.