Browse Prior Art Database

Spiral Disc Scanner

IP.com Disclosure Number: IPCOM000097319D
Original Publication Date: 1962-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Rutter, DE: AUTHOR

Abstract

Optical scanning of an illuminated line of printing on a document is accomplished by a disc bearing a mirror. This is formed in an Archimedean spiral so as to maintain a constant length optical path from any point in the line to the image utilization device.

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Spiral Disc Scanner

Optical scanning of an illuminated line of printing on a document is accomplished by a disc bearing a mirror. This is formed in an Archimedean spiral so as to maintain a constant length optical path from any point in the line to the image utilization device.

Disc 3 (1), having mounted on it one or more spiral mirrors 4 to provide multiple scans during a disc revolution, is angularly oriented relative to document 5 (2). Disk 3 is mounted for rotation on bearings 6 and is driven through peripheral gear 7.

When disc 3 rotates at a uniform rate, the effective reflecting surface of mirror 4 moves at a constant rate from position A to position B (shown in phantom). Such action successively reflects the indicia of the printed line on document 5 to stationary mirror 8 and lens 9 to an image utilization device. The optical distances from all points in the printed line to mirror 8 are equal during a scan and no scan return time is necessary. This arrangement eliminates variation in the depth of field during scanning.

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