Patent ID: 11879779
Assignee: 3M INNOVATIVE PROPERTIES COMPANY
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 14:
15. An optical device, comprising:
a wavelength-selective optical filter, the filter including:
a first plurality of spatially-variant areas disposed in the optical filter, at least one area of the first plurality of spatially-variant areas including a downconverter; and
a second plurality of spatially-variant areas disposed in the optical filter; and
a third plurality of spatially-variant areas disposed in the optical filter,

wherein the wavelength-selective optical filter comprises first and second filter sheets, the first filter sheet defining therein at least one first written region and at least one first non-written region, the second filter sheet defining therein at least one second written region and at least one second non-written region, and wherein:
the first plurality of spatially-variant areas comprises an area of the at least one first written region overlapping with an area of the at least one second non-written region;
the second plurality of spatially-variant areas comprises an area of the at least one first non-written region overlapping with an area of the at least one second written region; and
the third plurality of spatially-variant areas comprises an area of the at least one first written region overlapping with an area of the at least one second written region.