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Browse Prior Art Database

Method for Profiling Personal Computer Memory Card International Association Cards

IP.com Disclosure Number: IPCOM000116780D
Original Publication Date: 1995-Nov-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Jones, M: AUTHOR [+5]

Abstract

Personal Computer Memory Card International Association (PCMCIA) printed circuit boards are densely populated due to their high function and small size. This makes the inclusion of tooling holes required for Printed Circuit Board (PCB) assembly, extremely difficult. To overcome this limitation unpopulated areas of the PCB (Fig. 1) are included in the design for tooling holes and handling. Once PCB assembly is complete the inactive areas must be removed while maintaining stringent PCB length and width tolerances. Described is a method for removing these areas while maintaining length and width tolerances. Described is a method for removing these areas while maintaining length and width accuracy's of +/- 1.0 mils.

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

Method for Profiling Personal Computer Memory Card International
Association Cards

      Personal Computer Memory Card International Association
(PCMCIA) printed circuit boards are densely populated due to their
high function and small size.  This makes the inclusion of tooling
holes required for Printed Circuit Board (PCB) assembly, extremely
difficult.  To overcome this limitation unpopulated areas of the PCB
(Fig. 1) are included in the design for tooling holes and handling.
Once PCB assembly is complete the inactive areas must be removed
while
maintaining stringent PCB length and width tolerances.  Described is
a
method for removing these areas while maintaining length and width
tolerances.  Described is a method for removing these areas while
maintaining length and width accuracy's of  1.0 mils.

      To accomplish this a series of 10.0 mil holes on 15.0 mil
centers are drilled on the center line between the active and
inactive areas of the PCB (Fig. 2).  Once assembly is complete, the
inactive areas can be manually "snapped" off and discarded.  The
fracture line occurs at the closest point between adjacent holes
(e.g., on the center line between adjacent holes).  Since drilling
location accuracy's of  0.5 mils are routine, overall PCB length
and width tolerances of 1.0 mils are easily achieved.