Patent ID: 7535569

Claim:
Optical measurement unit for a measurement device for the photoelectric scanning of a measurement location of a measurement object, comprising: an illumination arrangement (IU) for impinging of the measurement object (MO) with illumination light under a first defined, relatively small angle of incidence range (ε) and with an optical pickup arrangement (PU) for capturing of measurement light remitted from the measurement object (MO) under a defined, relatively small pickup angle range (α), wherein the illumination arrangement (IU) has a pair of illumination light sources ( 31 a , 31 b ) which impinge the measurement object (MO) from different spatial directions under the same first angle of incidence range (ε) with illumination light, whereby illumination beam paths (ILa, ILb) at least in the vicinity of the measurement object (MO) are offset to one another by an offset angle (φ) of essentially 90° relative to an axis (AX) perpendicular to the measurement location, and wherein the optical pickup arrangement (PU) includes a redirecting prism ( 41 ), a pickup lens ( 42 ), a coupling lens ( 43 ), and an adjustable aperture means ( 44 ), whereby the coupling lens ( 43 ) feeds the measurement light received through the redirecting prism ( 41 ) and the pickup lens ( 42 ) through the adjustable aperture means ( 44 ) into a light conductor (L) and the adjustable aperture means ( 44 ) limits a captured measurement region (MS) on the measurement object.