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    Printed circuit assemblies
    4.
    发明专利
    Printed circuit assemblies 未知

    公开(公告)号：GB1128939A

    公开(公告)日：1968-10-02

    申请号：GB3475767

    申请日：1967-07-28

    Applicant: IBM

    Inventor： CUZNER DAVID EVERARD

    IPC: H05K7/20

    Abstract: 1,128,939. Printed circuit assemblies; cooling. INTERNATIONAL BUSINESS MACHINES CORP. 28 July, 1967, No. 34757/67. Heading H1R. To facilitate forced cooling of a circuit assembly, a plurality of printed circuit cards 12-15 (Fig. 1), each carrying a plurality of micro modules, are assembled on tubes 11, holes being provided in the tubes registering with spaces between cards, so that a stream of air from a fan (not shown) flows from an air distribution box 10 through the holes and between the cards to cool the micro-modules thereon. The spaces between adjacent modules on a card are blocked by spacers (Fig. 3, not shown), and spacers 37 (Fig. 7) between adjacent cards on the tube have baffles 53 to direct the stream of air close to projecting metal fins (24), Fig. 2 (not shown), on the modules, which fins create a turbulence and improve the heat exchange. Each air distribution tube 11 is of square cross-section and is constructed from four multi-layer printed circuit boards (Fig. 5, not shown) which provide the electrical interconnections between the cards 12, 13, 14, 15. Each card 12-17 and spacer 37 has a square central hole (Fig. 3, not shown) through which the tube 11 is passed on assembly. Printed circuit cards 16, 17 on each sub-assembly 6, 7, 8, 9, are interconnected by tapes 20 and conventional connectors 18, 19, and provide input/output connections to the circuit assembly Spring finger contacts 51, soldered on each card, engage printed circuit lands (33), Fig. 5 (not shown) on the tube 11, there being one pair of rows of lands to each card. Camming surfaces 54 on the spacers 36, 37 press the fingers 51 down on to the tube as axial pressure is applied to the stack of cards and spacers by a screw 43 on a tie-rod 40 acting against an end cap 41. Pins projecting from the micro-modules substrates are soldered into holes in the circuit cards, to provide electrical connections to the modules.

    Printed circuit assembly
    6.
    发明专利
    Printed circuit assembly 未知

    公开(公告)号：GB1128940A

    公开(公告)日：1968-10-02

    申请号：GB3475867

    申请日：1967-07-28

    Applicant: IBM

    Inventor： CUZNER DAVID EVERARD

    IPC: H05K7/20

    Abstract: 1,128,940. Printed circuit assemblies. INTERNATIONAL BUSINESS MACHINES CORP. 28 July, 1967, No. 34758/67. Heading H1R. [Also in Division H2] A circuit assembly comprises a plurality of sub-assemblies 6, 7, 8, 9 (Fig. 1, not shown) each including a plurality of printed circuit cards 12 to 15 which support and provide interconnections between a plurality of integrated circuit modules 22 (Fig. 3) and Fig. 2 (not shown), arranged around an aperture 26 in each card, through which aperture extends an air distribution tube 11 formed by four multi-layer printed circuit cards 32 (Fig. 5) carrying printed wiring interconnecting the printed circuit cards 12 to 15. As shown Fig. 7, between each pair of adjacent cards is a spacer 36, 37. Spring fingers 51 are soldered to printed lands at the edges of the apertures 26 of the cards 12 to 17. When assembling the cards and spacers axially on to the tube 11, the fingers do not exert much pressure thereon. Camming surfaces 54 on the spacers 36, 37 however, press the fingers 51 against the tube lands 33 (Fig. 5), as axial force is applied to the stack of cards and spacers by a screw 43 on a tie-bar 40 acting on an end cap 41. Printed circuit interconnection cards 16, 17 which may or may not carry modules provide input/output connections to the circuit assembly. Printed lands around the central aperture S of 16, 17 are connected by the spring fingers to the printed circuit tube, and are connected to lands around their outer edges. The outer edge lands of cards 16, 17 are connected by conventional connectors and tape cables to the interconnection cards of the other sub-assemblies (Fig. 1, not shown). The micro-modules 22 (Fig. 2, not shown) each comprise integrated circuits on a substrate and encapsulated in a metal can. Electrical connection pins, projecting from the substrate, are soldered into holes in the printed circuit cards. Cooling air from a fan passes through the tubes 11, out through apertures therein, which register with the spaces between the cards, and across the micro-modules. Plated holes and strips are provided at the outer edges of each card and are connected to the circuitry for testing purposes.

    CIRCUIT ASSEMBLY
    9.
    发明专利
    CIRCUIT ASSEMBLY 未知

    公开(公告)号：GB1217621A

    公开(公告)日：1970-12-31

    申请号：GB701268

    申请日：1968-02-13

    Applicant: IBM

    Inventor： CUZNER DAVID EVERARD ,  MULHOLLAND PATRICK JOHN

    IPC: H01L23/467 ,  H01L25/03 ,  H05K7/20

    Abstract: 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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