Patent ID: 7504718
Filing Date: 2009-03-17
Classification: H01L,H05K

Abstract:
1. An electronic apparatus, comprising: a first substrate having first and second surfaces and an IC (integrated circuit) chip mounted to the first surface of the first substrate; a second substrate having first and second surfaces, wherein the second surface of the first substrate is mounted to the first surface of the second substrate; a first stiffener plate having first and second surfaces, wherein the first stiffener plate has an aperture region formed between the first and second surfaces of the first stiffener plate, and wherein the first stiffener plate is bonded to the second substrate such that the first substrate is aligned with the aperture region; and a second stiffener plate bonded to the second surface of the second substrate such that the second stiffener plate is aligned to the first substrate and the aperture region, wherein the first and second substrates are package substrates and wherein the first and second stiffener plates are bonded to the second surface of the second substrate with the second stiffener plate disposed in the aperture region of the first stiffener plate, further comprising underfill material disposed in an interface between the first and second substrates, and bonding material disposed between an interface between the second substrate and the second stiffener plate, wherein the underfill material and bonding material have the same or similar cured mechanical properties.