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Simplified Optical Unit for a Page Scanner

IP.com Disclosure Number: IPCOM000095306D
Original Publication Date: 1965-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Tibbetts, RE: AUTHOR

Abstract

In a page scanner which serially scans the lines of a page, it is necessary to first direct light onto the page and then to direct the light reflected from the page onto an image plane.

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Simplified Optical Unit for a Page Scanner

In a page scanner which serially scans the lines of a page, it is necessary to first direct light onto the page and then to direct the light reflected from the page onto an image plane.

A rotating polygon can be used to direct both incident and reflected light. Incident light, originating from the lamp, is relayed through lenses and rendered approximately parallel to evenly illuminate the desired scan area. The incident light is then deflected by one face of the rotating polygon onto the page being scanned.

Light reflected from the page is deflected by an adjacent face of the rotating polygon through a relay lens onto an image plane. As the polygon rotates, the scan area is moved across the page. In this manner, two adjacent faces of the rotating polygon are always in constant use. One deviates incident light onto the page. The preceding face deviates the light reflected by the page toward an image plane.

As the polygon rotates, and one line is scanned, the page advances at a constant velocity in a direction parallel to the axis of rotation of the rotating polygon so that the end of one line flows smoothly into the start of the next.

The image of the scan area is located as shown. A photosensitive receptor can be located at the image plane and used to interpret characters on the page.

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