Patent ID: 11860441
Assignee: UNISPECRAL LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A Microelectromechanical Systems (MEMS) tunable filter comprising: a lens and a frame that is configured to support the lens; a front mirror and a back mirror having a tunable gap disposed therebetween and at least one actuation electrode configured to tune the gap and obtain a desired transmission profile, wherein the frame is part of the at least one actuation electrode;
wherein the lens has a coefficient of thermal expansion (CTE) of a first value and the frame has a CTE of a second value different than the first value; wherein the frame and the lens are formed from an etched silicon-on-glass wafer and comprises multiple grooves that form a flexible interface that compensates for differences between thermal expansions of the lens and of the frame, and wherein the dimensions of the grooves are such that they reduce bow of the lens resulting from thermal mismatch between the frame and the lens, while limiting reduction in actuation area of the actuation electrode.