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Browse Prior Art Database

Manual Inspection Assembly

IP.com Disclosure Number: IPCOM000112562D
Original Publication Date: 1994-May-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Edmundson, RJ: AUTHOR [+3]

Abstract

Disclosed is a manual inspection assembly used to provide the operator of a machine vision inspection workstation with a magnified color image of Devices Under Test (DUTs) to evaluate individual features whose status cannot be determined with machine vision inspection techniques alone.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 61% of the total text.

Manual Inspection Assembly

      Disclosed is a manual inspection assembly used to provide the
operator of a machine vision inspection workstation with a magnified
color image of Devices Under Test (DUTs) to evaluate individual
features whose status cannot be determined with machine vision
inspection techniques alone.

      In prior art, DUTs of indeterminate status had to be removed
from the workstation and the questionable features individually
inspected under a microscope off line.

      The inspection workstation examines individual features of a
DUT for proper size and contour by shining monochromatic light from
an oblique angle over the DUT and measuring the shape and volume of
the shadow cast by each feature as the basis for accepting or
rejecting it.  The operator views the image of the shadow on a black
and white monitor to verify the judgment made by the machine vision
algorithm and to identify the cause of failure for rejected features.

      In borderline cases, the Manual Inspection Assembly provides an
enlarged color image of the surface viewed from above and displayed
on a 20-inch monitor to help the operator determine the proper
disposition of the  DUT.

      The Manual Inspection Assembly, shown in the Figure consists of
the optics carrier 1 (capable of 10X to 40X magnification), a 1.5X
objective 2 attached to the carrier with objective adapter 3, and a
fiber-optic ring light 4 mounted to the objective, providing vertical
illuminat...