Browse Prior Art Database

Floating Laminar Bus Concept

IP.com Disclosure Number: IPCOM000102609D
Original Publication Date: 1990-Dec-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 2 page(s) / 74K

Publishing Venue

IBM

Related People

Cummings, TP: AUTHOR [+2]

Abstract

Disclosed is a unique packaging concept used in power distribution to printed circuit boards. The idea consists of a 'floating laminar bus assembly' which provides freedom of movement, simplifying alignment and reducing stresses imparted on mating buses.

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This is the abbreviated version, containing approximately 57% of the total text.

Floating Laminar Bus Concept

       Disclosed is a unique packaging concept used in power
distribution to printed circuit boards.  The idea consists of a
'floating laminar bus assembly' which provides freedom of movement,
simplifying alignment and reducing stresses imparted on mating buses.

      A laminar bus is formed around the perimeter of a printed
circuit board to which it provides power distribution.  It is
constructed of several conductors laminated together with insulation
between them.

      In previous designs mating buses were fixed in place. Hence,
when assemblies were bolted together, the forces required to align
tabs often caused cracking and delamination of the laminated bus.
This new packaging design concept allows the laminated bus to float
or move into alignment with fixed buses, without imparting excessive
forces on the laminates.

      The floating laminar bus concept is achieved by combining
unique packaging hardware with manipulation of the physical
properties of the laminar bus.

      A housing is mounted rigidly to a sub frame.  It acts like a
tray in which the bus is placed where it can float in the critical
Z-axis (see figure).  This is important because of a large tolerance
build-up which occurs between the mating buses when the sub frame is
fastened to a main frame. This float absorbs these tolerances by
aligning laminar bus input tabs with the rigid solid buses fixed in
the main frame.

      Float in the Z-axis...