Browse Prior Art Database

Paste Discrimination Tool

IP.com Disclosure Number: IPCOM000108012D
Original Publication Date: 1992-Apr-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 2 page(s) / 61K

Publishing Venue

IBM

Related People

Kim, DY: AUTHOR [+2]

Abstract

Disclosed is device for identification of copper paste type by discriminating between the reflectance differences seen by the Paste Discrimination Tool. Paste cartridges are being mistakenly loaded into the Screener system. There is a need for a positive on-line paste verification station to eliminate this problem.

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Paste Discrimination Tool

       Disclosed is device for identification of copper paste
type by discriminating between the reflectance differences seen by
the Paste Discrimination Tool.  Paste cartridges are being mistakenly
loaded into the Screener system.  There is a need for a positive
on-line paste verification station to eliminate this problem.

      The Paste Discrimination Tool has been designed and
implemented.  The tool is shown in Fig. 1.  The operator spreads some
of the paste from the cartridge onto a sample sheet.  The sample area
should be at least one inch in diameter.  The top hinged sensor
holder assembly is sample area at the same time.  Both sensors
deliver the illumination and collect the reflected light from the
sample in retro-reflection.  One sensor operates at 920 nanometers
illumination while the other operates over a wider spectral
bandwidth, containing both visible and near IR light.  The return
light is selectively reflected by the pastes following the
reflectance curve shape shown in Fig. 2.

      The need for two different electronic thresholds in the
detection electronics can be seen from the reflectance curves.  The
reflectance signals are sent to the controller/amplifier.  This unit
contains two indicator lights.  The lights will be activated in a
sequence that is related to which thresholds are exceeded by the
reflected signal.

      The outputs, in the form of red lights, which can be viewed by
the operator,...