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Optical Scanner Window Assembly

IP.com Disclosure Number: IPCOM000080042D
Original Publication Date: 1973-Oct-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Berreth, ME: AUTHOR [+3]

Abstract

In some optical scanners, an intense beam of radiation must be transmitted through a PYREX* window and focused into a small spot or line on a document adjacent the window. The document slides across a metal frame to which the window is bonded.

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Optical Scanner Window Assembly

In some optical scanners, an intense beam of radiation must be transmitted through a PYREX* window and focused into a small spot or line on a document adjacent the window. The document slides across a metal frame to which the window is bonded.

The heat in the scanner assembly breaks the window if it is rigidly bonded to the frame, because of the difference in thermal coefficients of expansion. A flexible bonded joint, however, allows the window and the frame to expand at different rates without inducing excessive stress in either. For a window about 1cm wide and 9cm high, a layer of silastic rubber compound 0.2-0.4 mm thick provides a sufficiently flexible joint. * Trademark of Corning Glass Works

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