Patent ID: 7205175
Filing Date: 2007-04-17
Classification: H01L

Abstract:
1. Method for encapsulating a chip with encapsulant, one portion of the surface of which chip must remain free of encapsulant, comprising the following steps (a) fixing the chip on a carrier that can be provided with a suitable conductor structure, (b) placing the carrier and the chip in one part of a mould having at least two parts, (c) positioning a material on a part of one of the mould and the chip surface, such that the material is clamped between the said parts of the chip and the mould after the mould has been closed, (d) closing the mould, introducing the encapsulant and creating conditions under which the encapsulant at least partially cures in the mould, wherein the material in step (c) consists of a pre-produced moulding made of a suitable heat-resistant material, wherein dimensions of the moulding in directions parallel to the surface of the chip are so chosen that a portion of the chip surface, accurately delimited as desired and including the portion of the chip surface that is to be kept free, will be covered when the mould is closed, wherein a dimension of the moulding in a direction perpendicular to the chip surface is determined by the desired distance between the mould surface and the portion of the chip surface that is to be kept free, wherein the moulding is provided with a top face and a bottom face, essentially parallel to one another, and side walls running between the top and bottom faces, the dimensions of the top face of the moulding being greater than the dimensions of the bottom face, the side walls being at a certain angle with respect to the top face and the bottom face, and wherein an inside wall of the mould part against which the moulding is to be fixed is provided with a recess, a shape of the recess corresponding to a shape of a top part of the moulding so that a dimension of the recess at the inside wall of the mould is less than a corresponding dimension of the recess more distant from the inside wall of the mould.