Browse Prior Art Database

Inter Card "0" Insertion Force Connector

IP.com Disclosure Number: IPCOM000089557D
Original Publication Date: 1977-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 88K

Publishing Venue

IBM

Related People

Evans, RT: AUTHOR

Abstract

The inter-card "0" insertion force connector provides the ability to increase circuit packaging density by effectively increasing the basic card sizes. The number of circuits which can be placed on a given size card is a function of the I/O count for that packaging level. This has been described commonly by Rent's rule, N(I/O) = 4.8 (number of circuits)/2/3/, which varies within reasonable limits.

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Inter Card "0" Insertion Force Connector

The inter-card "0" insertion force connector provides the ability to increase circuit packaging density by effectively increasing the basic card sizes. The number of circuits which can be placed on a given size card is a function of the I/O count for that packaging level. This has been described commonly by Rent's rule, N(I/O) = 4.8 (number of circuits)/2/3/, which varies within reasonable limits.

The card onboard packaging has been constrained to various degrees by the aforementioned Rent's rule. Higher density I/O at the cardboard interface and top card connectors improve the situation, but there are always circuit capabilities, particularly in LSI (large-scale integration), which outstretches the minimal advances made in higher level packaging techniques. If two equal size cards can be physically and electrically joined, the resultant area can support many more circuits than two cards can individually. For example, using Rent's formula, 48 I/O pins support 31.6 circuits. and 96 I/O pins support 89.4 circuits, which is 41% greater than two half-sized cards can support.

The "0" insertion force connector has been designed to tie adjacent cards together. The cards to be tied together require circuit patterns and lands 7 to be placed along the required side edges. The cards are assembled to the board in the usual manner, as shown in Fig. 1. The formed contacts 10 are deflected inward to move past the restraining lip of the H...