Light integrating system with reduced dynamic shading

摘要

A film scanner 10 illuminant system 20 with a light integrator module 50 for creating an homogenous light illuminant from a light source 25. Temporal variations in light beam profiles from the light source 25 which introduce low level temporal variations in the spatial homogeneity of light from the integrator are reduced below level of perceptibility by use of a light shaping diffuser 43 to diffuse the beam of input light at the light input port 52 of the light integrator. Preferably asymmetric light diffusers 43 are used although some additional advantage is obtainable by use of spherical diffusers. The diffuser may be used with a variety of known light integrator configurations. <IMAGE>