Browse Prior Art Database

Automated Positioning System

IP.com Disclosure Number: IPCOM000090375D
Original Publication Date: 1969-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Ogden, GD: AUTHOR [+2]

Abstract

This system for alignment of a workpiece in relation to a holographic image employs a Michaelson interferometer for fine focusing and for adjusting parallelism of the workpiece at the image plane. Lateral displacement is compensated for by using an illuminated triangular pattern of holes in the workpiece which cooperates with photodetectors to determine illumination imbalance due to misalignment.

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Automated Positioning System

This system for alignment of a workpiece in relation to a holographic image employs a Michaelson interferometer for fine focusing and for adjusting parallelism of the workpiece at the image plane. Lateral displacement is compensated for by using an illuminated triangular pattern of holes in the workpiece which cooperates with photodetectors to determine illumination imbalance due to misalignment.

The interferometer shown at A consists of beam splitter 2, mirror surfaces 3 and 4 and a laser beam. Mirror 3 is made adjustable and can be moved to a plurality of locations as indicated by the dotted lines, since the laser can have a coherence length of less than separation from the hologram 10 to workpiece 8. The correct hologram-to-workpiece separation along the Z axis is obtained by using IR wavelengths on the order since the laser can have a coherence length of less than separation from the hologram 10 to workpiece 8. The correct hologram-to-workpiece separation along the Z axis is obtained by using IR wavelengths on the order of ten microns in the interferometer. The workpiece is first registered mechanically, after which fringe counting system 1 is employed to position the workpiece more accurately through controller 5 and three servo systems of which two, indicated by 6 and 7, are shown.

With the workpiece and hologram parallel and correctly separated, the proper X-Y relationship is established. Three small holes displaced 120 degrees...