Patent ID: 11906765
Assignee: nan
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A thin-film interference filter comprising:
a first thin-film interference multi-layer stack composed of individual thin-film layers arranged in groups to form a plurality of first repeat unit blocks;
a second thin-film interference multi-layer stack composed of individual thin-film layers arranged in groups to form a plurality of second repeat unit blocks; and
at least one interlayer between the first thin-film interference multi-layer stack and the second thin-film interference multi-layer stack,
wherein the second thin-film interference multi-layer stack has a different optical transmission spectrum than the first thin-film interference multi-layer stack,
wherein the at least one interlayer has a thickness that is 10-1000 times thicker than that of each individual thin-film layer in the first thin-film interference multi-layer stack,
wherein the thin-film interference filter is flexible enough to be bendable to a radius of curvature of 250 mm or less without permanently damaging, deforming or cracking the thin-film interference filter as a whole, or the thin-film layers in the at least one multi-layer stack, and
wherein the total thickness of the thin-film interference filter is within the range of 0.05 mm to 1 mm.