2024年4月16日发(作者：)

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专利名称：Printed circuit assemblies

申请号：JP5256568

申请日：19680726

公开号：JPS479651B1

公开日：19720322

摘要：1,217,621. Circuit assemblies. INTERNATIONAL BUSINESS MACHINES CORP. 13

Feb., 1968, No. 7012/68. Heading H1R. In a circuit assembly in which a plurality of printed

circuit cards are mounted in a spacedapart relationship in a supporting structure, the

circuit cards being each provided with an aperture through which an expandable tube

extends to supply cooling air to the cards, the tube is removable from the assembly. The

assembly comprises a central air distribution box of square cross-section, Fig. 1 (not

shown), and four sub-assemblies projecting one from each face of the central distribution

box. Each subassembly comprises an air distribution tube 11, Fig. 3, communicating with

the air box and formed of four printed circuit boards 32 provided with rows of apertures

for allowing the passage of air, Fig. 9 (not shown). The tube 11 extends through aligned

apertures of a plurality of apertured printed circuit cards 12 to 17, cards 12 to 15 carrying

a plurality of micromodules and providing the interconnection therebetween. Printed

circuit cards 16, 17 do not carry modules but are connected by tape cables and

connectors 18, 19 to interconnecting cards in other adjacent sub-assemblies. Each printed

circuit board 32 of the tube 11 is provided with a backing plate 80 to which an expanding

force is applied by an expanding device which comprises two rubber bushes 90 free to

move along actuating bolt 84 in each of which is embedded the ends of four equally

spaced radially extending struts 91 push fitted into rubber-lined sockets 92 in the

backing plates 80. In an unloaded position the struts 91 are held at an angle to the radial

plane so that the tube 11 can be inserted through the cards 12 to 17. After insertion the

boards 32 of the tube 11 are expanded by screwing the actuating bolt 84 into the nut 85

in the central air box so that the boards 32 are pushed outwardly into contact with

connector 71 which forms one side of a rectangular connector assembly, one of which is

located on each face of printed circuit cards 12 to 17. The sub-assemblies are each

releasably supported by a supporting structure comprising four power buses 62 which

are bolted at one end to the central box. Stubs 60 at each corner of a card 12 to 17 are

clamped to respective ones of the four busbars 62 by suitable clamps, which are

constructed so that when released they can be withdrawn along the bus-bar to permit

withdrawal and reinsertion of any one of the cards without disturbing the others. The air

distribution tube is withdrawn before the withdrawal of a card. Cooling air is blown from

the central air box down the tube 11 through the apertures in the backing plates 80 and

printed circuit boards 32 and in the spaces between baffles 38 mounted adjacent printed

circuit cards 12 to 17 carrying modules 22 which include integrated circuits mounted on a

substrate and encapsulated in a metal can in thermal contact with the integrated circuit.

Metal extension pins of square crosssection project from the upper surface of the can

and improve the exchange of heat between the module and cooling air. Reference has

been directed by the Comptroller to Specifications 1,128,939 and 1,128,940.

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