Patent ID: 7141870
Filing Date: 2006-11-28
Classification: B81B,H01L

Abstract:
1. A micro-electromechanical system package, the package comprising: a first substrate; a micro-electromechanical system (MEMS) chip coupled to the first substrate, wherein the MEMS chip has a first surface area and an outer perimeter; a plurality of bond pads coupled to a peripheral portion of the first surface area; a transparent cover coupled to an upper surface of the MEMS chip, wherein the transparent cover has a second surface area and an outer perimeter, the first surface area being larger than the second surface area, and at least one shelf region is formed by the difference in surface areas, the plurality of bond pads being coupled to the at least one shelf region; a ceramic ball grid array structure coupled to the at least one shelf region, the ceramic ball grid array structure having an annular structure in the form of a rectangle, the annular structure having a top surface, a first inner surface adjacent the top surface of the annular structure, a lower surface opposite the top surface and adjacent the first inner surface, a second inner surface adjacent the lower surface, and a plurality of bond balls spaced at predetermined intervals on the lower surface of the annular structure, wherein the second inner surface is located at a greater distance from the top surface of the annular structure than the first inner surface and the second inner surface is recessed with respect to the first inner surface; an encapsulant located between the first inner surface of the ceramic ball grid array structure and an outer perimeter of the transparent cover, wherein the encapsulant hermetically seals the first inner surface of the ceramic ball grid array structure to the outer perimeter of the transparent cover.