Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1986-07-02
1987-12-08
Kittle, John E.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428209, 428432, 428901, 361383, 29840, 174 16HJ, B32B 300, H02B 100, H01B 734, H05K 334
Patent
active
047118040
ABSTRACT:
A circuit board assembly for supporting a leadless ceramic chip carrier for surface mounting on a printed circuit board and for reducing the thermally induced stress on solder joint connections at the carrier-to-board contacts. The board includes an inner heat sink core comprising a highly conductive plate having openings provided therein in the areas which underlie the chip carrier. The openings have inserts therein of a material which closely matches the thermal coefficient of expansion of the ceramic to thereby reduce stress of the intermediate solder joints.
REFERENCES:
patent: 4318954 (1982-03-01), Jensen
patent: 4385202 (1983-05-01), Spinelli et al.
patent: 4546406 (1985-10-01), Spinelli et al.
patent: 4570337 (1986-02-01), Butt
patent: 4581680 (1986-04-01), Garner
patent: 4590095 (1986-05-01), Park
IBM Tech. Disclosure Bulletin, T. O. Ledgwick, Mounting Technique for Solder Reflow Areal Array Mounted Silicon Chips which Allows Direct & Efficient Backside Heat Removal, vol. 20, No. 12, May, 1978, p. 5391.
Davis Jr. James C.
General Electric Company
Kittle John E.
Ryan Patrick J.
Snyder Marvin
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