Browse Prior Art Database

Alignment System

IP.com Disclosure Number: IPCOM000109361D
Original Publication Date: 1992-Aug-01
Included in the Prior Art Database: 2005-Mar-23
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Chu, KL: AUTHOR [+3]

Abstract

This article describes an optical/computer system for use in aligning two parts located axially for subsequently making contact which takes advantage of the inherent precision of an optical prism to replace mirrors.

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

Alignment System

       This article describes an optical/computer system for use
in aligning two parts located axially for subsequently making contact
which takes advantage of the inherent precision of an optical prism
to replace mirrors.

      The concept employs the basic principle of viewing
simultaneously the two features, i.e., probe and circuit terminal.
However, they are not superimposed, but displayed as two images which
simplifies calculation of centers.

      Fig. 1 shows the optical system.  A probe 1 supported on a
vertical slide and the circuit terminal 2 on the product are viewed
by a TV camera 4.  A prism 3 has the normal entrance and exit faces
which are coated with a metal film to form two high quality front
surface mirrors at 45~ to the horizontal plane.

      TV camera 4 with axial illumination 5 and a suitable lens
combination views both images as shown in Fig. 1 (Volpi Intrascope
series 2000 may be a good alternative).

      The relative position of the two targets are analyzed by
comparing the XY coordinates as shown in Fig. 2 using a machine
vision system (MVS).