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Browse Prior Art Database

Pin With S-Shaped Cross Section

IP.com Disclosure Number: IPCOM000100750D
Original Publication Date: 1990-Jun-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Asselta, JA: AUTHOR [+3]

Abstract

Disclosed is a pin with an S-shaped cross section for providing electrical interconnection between a printed circuit (PC) board and a flexible circuit member. The geometry and orientation of the pin, with respect to the PC board, provide structural stiffness as well as process cleaning advantages.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Pin With S-Shaped Cross Section

       Disclosed is a pin with an S-shaped cross section for
providing electrical interconnection between a printed circuit (PC)
board and a flexible circuit member.  The geometry and orientation of
the pin, with respect to the PC board, provide structural stiffness
as well as process cleaning advantages.

      The pin 1 (Fig. 1) is fabricated in a tie strip form, thus
permitting continuous reel heat treating and plating. Rotation with
respect to the top and bottom selvage strips 2 and 3 is performed to
orient the break-off notches 4 (Fig. 2) in the proper direction for
mechanical removal of the selvage.  The cross section of the pin
provides structural stiffness to resist the break-off forces.

      In one application (Fig. 3) removal of the bottom selvage 3
permits strip insertion of multiple pins 1 into the plated through
holes (PTHs) 5 of the PC board 6 for subsequent solder attachment.
The upper selvage 2 is removed to allow affixing of a flexible
circuit/hard card member 7, that is mechanically and electrically
interconnected to the pins 1 by means of a solder ring or equivalent
solder processing.

      The orientation of the pins 1 beneath the flexible circuit
assembly provides open channels for process cleaning of fluxes and
other contaminants.  The channels also permit clearances for
mechanical lifting tools during rework removal of the flex assembly
from the soldered board pins.