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Scanning System Incorporating Translating and Rotating Mirrors

IP.com Disclosure Number: IPCOM000077751D
Original Publication Date: 1972-Sep-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Miller, MJ: AUTHOR

Abstract

Two planar mirrors, the first of which translates while the second rotates in synchronism therewith, are utilized to scan a flat document and to project an image thereof onto a moving photoreceptive surface.

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Scanning System Incorporating Translating and Rotating Mirrors

Two planar mirrors, the first of which translates while the second rotates in synchronism therewith, are utilized to scan a flat document and to project an image thereof onto a moving photoreceptive surface.

Translating flat mirror 11 is moved on carriage 13 in a precise parabolically curved path defined by guide 15, from a start of scan position (solid line) to an end of scan position (broken line). Rotating planar mirror 17 is located at and pivots about the focal point of the parabola generated by the translating mirror path. Light originating at illumination source 19 is reflected from planarally held document 21 onto translating mirror 11, and thence to rotating mirror 17 and through fixed lens 23 onto moving photoreceptive surface 25. Since the translating mirror moves in a parabolic path having the pivot point of the rotating mirror as its focus, all path distances from document 21 to lens 23 are constant. That is, distance a1 + b1 = a2 + b2. In addition, rays a1, a2 are parallel to each other.

The velocities of the moving mirrors 11, 17 are synchronized to the photoreceptor velocity and to each other. For example, if the magnification were equal to 1.0, the velocity at which the document is scanned is equal to the photoreceptor velocity (Vx). This requires the velocity of translating mirror 11, in a direction parallel to document 21 to be equal to velocity Vx. Likewise, rotating mirror 17 will...