Patent ID: 6777259
Filing Date: 2004-08-17
Classification: B29C,B81B,B81C,G01P,H01L

Abstract:
A method of making a micro-machined accelerometer package including:a chip having a top surface and a bottom surface and having a micro-machined accelerometer formed in the chip, the accelerometer including a mass cantilevered from the remainder of the chip to be movable out of the plane of the chip; and a first hollow molded cap bonded to the top surface over at least part of the accelerometer to define a first cavity into which the cantilevered mass may move, wherein the first molded cap is aligned over the accelerometer by being attached to a tool having substantially the same coefficient of expansion as the substrate of the chip, and the first molded cap is bonded to the chip at a wafer stage prior to separation of the wafer into individual chips.