Browse Prior Art Database

Constant Path Length Optical Scanner

IP.com Disclosure Number: IPCOM000077777D
Original Publication Date: 1972-Sep-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Wiley, JP: AUTHOR

Abstract

An optical path length of a rotating scanner is adjustable to maintain a constant length to a planar surface, by using a cam-displaced double error.

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Constant Path Length Optical Scanner

An optical path length of a rotating scanner is adjustable to maintain a constant length to a planar surface, by using a cam-displaced double error.

Light beam 1 from source 2 is reflected successively off mirrors 3 and 4 and onto surface 5. The mirrors are attached to housing 6 which is supported in rotating bracket 7 by shaft 8. Mirrors are mounted at an angle of 22-1/2 degrees from the axis of shaft 8 and at an angle of 45 degrees from each other. The axis of shaft 8 is at 45 degrees to the axis of rotation of support 10. Shaft 8 is longitudinally reciprocable in the bracket and is biased toward its upper limit by spring 9.

As bracket 6 is rotated on its support 10 to scan beam 1 across surface 5, the end of shaft 8 cyclically engages fixed cam 11. The cam is cut so as to move mirror housing 6 along the direction of shaft 8 as the assembly rotates from the position shown, and thereby maintain a constant path length for the beam without displacing the scanning trace.

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