Patent ID: 9634051
Date: 2017-04-25
CPC Classifications: G01J,G02B,H01L,Y02E,Y10T

Claim:
1. A wafer stack comprising: a wafer referred to as spacer wafer; a wafer referred to as optics wafer, comprising a multitude of passive optical components; and a wafer referred to as substrate wafer, wherein said spacer wafer is arranged between said optics wafer and said substrate wafer, and wherein the substrate wafer, the spacer wafer and the optics wafer are stacked along a vertical axis; said spacer wafer comprising a multitude of portions referred to as spacer portions, each of said spacer portions being located in a different one of a multitude of first laterally defined regions along a lateral axis perpendicular to the vertical axis, each of said spacer portions comprising one or more portions referred to as distancing portions, the spacer wafer having, in said one or more distancing portions, a vertical extension referred to as maximum vertical extension; at least two separate portions referred to as open portions, the open portions being disposed along a lateral axis perpendicular to the vertical axis, no material of the spacer wafer being present in said open portions; and one or more portions referred to as structured portions, wherein material of the spacer wafer is present in said structured portions, and the spacer wafer has, in said structured portion, a vertical extension smaller than said maximum vertical extension; wherein said wafer stack comprises a multitude of portions referred to as device portions, each of said device portions being located in one of a multitude of second laterally defined regions which are free from mutual overlap and that are disposed along a lateral axis perpendicular to the vertical axis; comprising one of said multitude of spacer portions; and comprising at least two of the passive optical components comprised in said optics wafer; wherein in each of said device portions, each of said at least two passive optical components extends vertically along a range referred to as vertical lens range, and in said wafer stack, at least one of said structured portions extends into said vertical lens range.