Electrical assembly
First Claim
1. An electrical assembly comprising:
- a multiplicity of chip carriers each containing a chip embodying a semiconductor integrated circuit, said chip being supported in a body of rigid material having a generally planar face with the chip being connected to an array of terminals on said planar face;
a circuit board of flexible material capable of undergoing movement in and out of and within the plane thereof and provided with electrical conductors on a face thereof;
soldered joints between the terminals and the electrical conductors mounting said chip carriers against one face of the circuit board without insertion of the terminals into the board and with the flexibility of said circuit board minimizing strain in said interconnections and consequential risk of said chip carriers becoming detached;
regions of said circuit board underlying said chip carriers defining holes through said circuit board;
a plate of thermally conductive material against the other face of the circuit board, said plate having heat sink pillars that project through said holes into direct contact with the undersides of said chip carriers while remaining detached from said chip carriers; and
means urging said chip carriers into thermally effective contact with said heat sink pillars, flexure and planar extension or compression of the circuit board permitting said direct contact to take place and the detachment of said chip carriers from said heat sink pillars permitting strain-releasing lateral movement of said chip carriers relative to said pillars.
2 Assignments
0 Petitions
Accused Products
Abstract
An electrical assembly incorporates a multilayer printed circuit board comprising a flexible electrically insulating circuit board laminate with electrical conductors for connecting to terminals on rigid slab-like heat-dissipating components such as circuit or component packages or carriers. A separate rigid metallic heat-sinking or spreading plate is applied, having protruding thermally conducting pillars passing through holes in the circuit board laminate to contact the components. A further rigid plate overlies the components and is clamped by clips or bolts to the plate. Compliant means such as springs of deformable and elastic rubber or plastics material is provided intermediate the further plate and the top of the components to accommodate difference in height or thickness between the components while transmitting pressure from the further plate to the top of the component to ensure contact between the components and the pillars on the heat sinking or spreading plate.
146 Citations
26 Claims
-
1. An electrical assembly comprising:
-
a multiplicity of chip carriers each containing a chip embodying a semiconductor integrated circuit, said chip being supported in a body of rigid material having a generally planar face with the chip being connected to an array of terminals on said planar face; a circuit board of flexible material capable of undergoing movement in and out of and within the plane thereof and provided with electrical conductors on a face thereof; soldered joints between the terminals and the electrical conductors mounting said chip carriers against one face of the circuit board without insertion of the terminals into the board and with the flexibility of said circuit board minimizing strain in said interconnections and consequential risk of said chip carriers becoming detached; regions of said circuit board underlying said chip carriers defining holes through said circuit board; a plate of thermally conductive material against the other face of the circuit board, said plate having heat sink pillars that project through said holes into direct contact with the undersides of said chip carriers while remaining detached from said chip carriers; and means urging said chip carriers into thermally effective contact with said heat sink pillars, flexure and planar extension or compression of the circuit board permitting said direct contact to take place and the detachment of said chip carriers from said heat sink pillars permitting strain-releasing lateral movement of said chip carriers relative to said pillars. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
-
Specification