Browse Prior Art Database

Video Based Alignment Tool Translation

IP.com Disclosure Number: IPCOM000120688D
Original Publication Date: 1991-May-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 1 page(s) / 52K

Publishing Venue

IBM

Related People

DeFoster, SM: AUTHOR [+3]

Abstract

Disclosed is a tool to optically align two elements. A good application would be to align a contact test head to a ceramic substrate, but the tool is by no means limited to this application.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 81% of the total text.

Video Based Alignment Tool Translation

      Disclosed is a tool to optically align two elements.  A good
application would be to align a contact test head to a ceramic
substrate, but the tool is by no means limited to this application.

      The basic concept entails two monochrome video cameras, a RGB
color monitor and two banks of memory to store two video images.  The
banks of memory are incorporated into video "frame grabbers".  A PC
is used to control the frame grabbers which are on a card (or cards)
within the PC.  One monochrome camera looks at one side of the mirror
which looks at one of the elements to be aligned.  The other
monochrome camera looks at the other side of the mirror which looks
at the other element to be aligned.  Note that one camera is on a
slightly different horizontal plane than the other to compensate for
the thickness of the mirror (see Figure).

      The image of one of the elements to be aligned is stored as a
binary image in one memory and the image of the other element to be
aligned is stored as a binary image in the other memory.  The two
memories feed separate color inputs of a color display.  The images
are laid over one another in different colors on the color display.
An operator can manually align the two elements by moving them until
they are correctly superimposed on the color monitor.

      The frame grabbers are built in such a way that they can be
accessed by the cameras and by the PC.  With the proper...