Patent ID: 11932529
Assignee: TEXAS INSTRUMENTS INCORPORATED
Field: Optics (Instruments)
Classification: CPC B  G | IPC B  G

Claim 8:
9. A method for fabricating a microelectromechanical system (MEMS) device, the method comprising:
performing gray-scale lithography with a photomask including both partial and complete concentric opaque circles on a sacrificial layer over a spring tip, to form depression features in the sacrificial layer, wherein the spring tip has a contact surface;
depositing a deformable layer on the sacrificial layer and in the depression features, wherein the deformable layer has protrusions corresponding to the depression features;
etching the deformable layer to form a mirror having the protrusions on a side of the mirror facing the spring tip; and
removing the sacrificial layer, wherein a protrusion of the protrusions has a radius of curvature of less than 10 microns.