Patent ID: 6888470

Claim:
A MEMS device, comprising: a stationary part; and a movable part movably coupled to the stationary part, wherein: the stationary part includes a first light sensor adapted to generate a first electrical signal and a second light sensor adapted to generate a second electrical signal that indicate a position of the movable part with respect to the stationary part in response to light impinging on the device; the movable part comprises: a first plate rotatably coupled to the stationary part; and a second plate rotatably coupled to the first plate; the stationary part and the movable part are separated by a gap; the first light sensor is adapted to be illuminated through the gap; the separation between the stationary part and the movable part changes as the position of the movable part changes with respect to the stationary part; the first electrical signal indicates orientation of the first plate with respect to the stationary part; and the second electrical signal indicates orientation of the second plate with respect to the first plate.