Patent ID: 8975108
Filing Date: 2015-03-10
Classification: G01S,H01L

Abstract:
1. A method of fabricating a plurality of optical proximity sensor modules, the method comprising: providing a substrate wafer having a first surface on which a plurality of light emitters are mounted and a plurality of light detectors are mounted, wherein each light emitter is disposed adjacent a corresponding one of the light detectors, the light emitters and light detectors being mounted on the substrate wafer in an arrangement, and wherein the light emitters are operable to emit light at a first wavelength and the light detectors are operable to detect light at the first wavelength; providing a spacer wafer composed of a non-transparent polymer material containing carbon black, wherein the spacer wafer has openings in an arrangement substantially corresponding to the arrangement of the light emitters and light detectors on the substrate wafer; providing an optics wafer comprising a blocking portion that substantially attenuates or blocks incident light at the first wavelength, the optics member further comprising a plurality of first and second transparent portions that are transparent to light at the first wavelength, the first and second transparent portions being arranged in an arrangement substantially corresponding to the arrangement of the light emitters and light detectors on the substrate wafer; preparing a wafer stack in which the spacer wafer is arranged between the substrate wafer and the optics wafer such that the light emitters and light detectors are disposed between the substrate wafer and the optics wafer, wherein the light emitters and the light detectors are surrounded by respective portions of the spacer wafer, wherein respective portions of the spacer wafer separate each particular light emitter from its corresponding light detector, and wherein each first transparent portion of the optics wafer is disposed above a respective one of the light emitters and each second transparent portion of the optics wafer is disposed above a respective one of the light detectors; and separating the wafer stack into a plurality of modules, each of which includes one of the light emitters and one of the light detectors.