Patent ID: 6239382
Filing Date: 2001-05-29
Classification: B23K,G02B,H01L,H05K,Y10T

Abstract:
An electronic assembly comprising:a base having a plurality of stacked, dissimilar materials, said base comprising:a first material having a thickness h.sub.1 ;a second material that is different from said first material and having a thickness h.sub.2 ; anda third material that is different from said first and said second materials and that secures said first and said second materials together in stacked relation to each other and that is located between said first and said second materials at a position determined by the equationT.sub.1 h.sub.1 +T.sub.2 h.sub.2 =0,where T.sub.1 and T.sub.2 are thermally induced forces of thermal contraction caused by the different first and second materials, the location of said third material in said base with respect to said first and said second materials controlling the bowing of said base when said base is exposed to changes in temperature;a first electronic component mounted to said first material; anda second component mounted to said first material and in operable alignment with said first electronic component such that bowing of said base beyond a predetermined amount will impair operation of said electronic assembly.