Patent ID: 6924559

Claim:
An electronic device comprising: a circuit on which several electronic components able to dissipate energy are placed; a thermal conducting cover located opposite the circuit; a thermally conducting encapsulant placed between the circuit and the cover so as to ensure heat transfer, by conduction toward the cover, of the energy dissipated in the components; wherein the respective surfaces of the encapsulant and of the cover which are facing each other include a number of substantially complementary recesses and projections allowing the cover to fit into the encapsulant; and that gaps are left between the recesses and the projections so as, on the one hand, to reduce the stress exerted by the cover on the encapsulant in the direction of the circuit and on the other hand, to maintain the thermal conduction between the encapsulant and the cover above a given conduction threshold, wherein since the cover, the encapsulant and the circuit constitute the layers of a stack, the contact surfaces between recesses and projections, facing the components, are not parallel to the mid-plane of the layers, wherein in a plane of section orthogonal to the mid-plane of the layers, the projections of the cover have a trapezoidal outline, the oblique sides of the trapezoid making between them an acute angle whose apex is directed toward the circuit.