Patent ID: 11906357
Assignee: X-RITE EUROPE GMBH
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 13:
14. An illumination device for a spectral optical measurement device, the illumination device comprising:
a light source arranged with respect to an optical axis of the illumination device which, during a measurement operation, extends along a normal to a center point of an area of a sample to be illuminated; and
at least one mirror segment shaped as at least a segment of a ring centered on the optical axis, the mirror segment having an internal reflective surface arranged such that, during the measurement operation, the internal reflective surface receives light emitted from the light source and reflects the light over the area of the sample to be illuminated, the internal reflective surface having a freeform shape in a cross-section through the mirror segment in a plane parallel to the optical axis, and wherein the internal reflective surface has curved shape in a cross-section through the mirror segment in a plane perpendicular to the optical axis, the curved shape being different from the ring shape.