Patent ID: 9335540
Filing Date: 2016-05-10
CPC Classification: G02B,G02F

Claim Text:
1. A method of making a MEMS device, comprising: forming a via opening within a sacrificial support layer formed over a substrate; depositing a first member forming layer over the sacrificial support layer, including as a liner within and partially filling the via opening; depositing a first fill layer over the first member forming layer, including over the first member forming layer within and further partially filling the via opening; depositing a second fill layer over the first fill layer including within the via opening, the second fill layer filling the via opening to a level above a top surface of the first member forming layer; depositing a masking material over the second fill layer, and patterning the masking material to form a mask covering the filled via opening and extending for a given lateral distance beyond a top of the via opening; patterning the first and second fill layers using the mask to form a raised protrusion with a given step height and lateral width at the top of the via opening; removing the mask following the patterning of the first and second fill layers; depositing a third fill layer over the patterned first and second fill layers to fill an indentation in the raised protrusion; removing the raised protrusion to planarize a top surface of the filled via opening with the top surface of the first member forming layer; and depositing a second member forming layer over the first member forming layer and over the planarized top surface of the filled via opening.