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Browse Prior Art Database

Bar Coding of Individual Devices With Encapsulants

IP.com Disclosure Number: IPCOM000103252D
Original Publication Date: 1990-Sep-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 1 page(s) / 55K

Publishing Venue

IBM

Related People

Munroe, RA: AUTHOR

Abstract

Disclosed is a system for individually identifying circuit components such as integrated circuits that are encapsulated such as TAB (Tape Automated Bonded) devices. The system uses available tools and can be implemented in several different schemes.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 68% of the total text.

Bar Coding of Individual Devices With Encapsulants

      Disclosed is a system for individually identifying circuit
components such as integrated circuits that are encapsulated such as
TAB (Tape Automated Bonded) devices.  The system uses available tools
and can be implemented in several different schemes.

      The concept is to put a bar code or other identification code
that would allow sufficient information to individually serialize and
identify a device if desired. A LASER is suggested as a high speed
non-contact method of putting the code on the encapsulant of the
device.  LASERS are readily programmed to do such work at high speeds
today in other applications.  The code can be read in a non-contact
method by a LASER reader directly from the device or a photograph of
the code.  The encapsulants tend not to be flat and the collimated
beam of the LASER combined with the digital codes available make this
a rapid and error-free system with a large combination of
error-producing shapes on the encapsulant which would inhibit marking
with contact printing methods.

      If a black or dark colored encapsulant is used, it is suggested
that a thin white paint or polymer be applied to the encapsulant.  If
a light colored or clear encapsulant is used, it is suggested that a
dark or black paint or polymer be applied to the encapsulant.  The
LASER is adjusted to sublimate the encapsulant and/or its covering
paint or polymer to provide the marking code.  The us...