Patent ID: 8440488

Claim:
A manufacturing method for a wafer level image sensor module with fixed focal length, comprising steps of: providing a silicon wafer including a plurality of image sensor chips wherein each said image sensor chip has a photosensitive area; providing a lens module array wafer that includes a plurality of wafer level lens modules, wherein each said wafer level lens module has a fixed focal length; testing and sorting all of the image sensor chips and the wafer level lens modules in grades according to different quality grades; according to the sorting results, assigning each said wafer level lens module, which is cut from the lens module array wafer, to be situated on the image sensor chip that has the same grade and making each said wafer level lens module aligned with a respective said photosensitive area; and performing a packaging process, which comprises steps of: placing the silicon wafer having the wafer level lens modules into a mold; introducing an encapsulation material into a mold cavity of the mold, such that the encapsulation material surrounds the wafer level lens modules and onto a first surface of the silicon wafer but does not cover upper edges of the wafer level lens modules; and after transfer molding the encapsulation material, opening the mold and performing a post mold cure process to cure the encapsulation material; wherein the mold comprises an upper mold member having a vacuum absorbed buffer layer for abutting against the upper edges of the wafer level lens modules and a lower mold member abutting against a second surface of the silicon wafer.