Title: Method and a system for concurrently copying both sides of an original

Abstract: A method and a system are provided for concurrently copying both sides of an original by concurrently scanning nonoverlapping areas of the two sides of the original with two incident beams and scanning adjacent areas of a copy with the resulting reflected beams. Since the two incident beams illuminate areas of the original that are not overlapping, each reflected beam forms only an image of one side of the original, without a faint shadow of the other side of the original. When the original and the copy move in opposite directions and the ratio between their scanning speeds is the same as the ratio between the size of the original and the size of the copy, aligned portions of the opposite sides of the original can be aligned with each other on the copy even though non-aligned areas of the original are scanned by the incident beams.

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Inventors: Yamashita, Hajime (Yokohama, JA)

Application Number: 521146
Filing Date: 1974-11-05
Publication_date: 1976-09-21
Assignee: Ricoh Co., Ltd. (Tokyo, JA)
Primary Class(es): 355/24 355/77
Other Classes:
US Patent Ref:

2578320	Dec, 1951	Schubert	355/23.
3079839	Mar, 1963	Lohner et al.	355/24.

Other Refs:
Primary Examiner: Wintercorn, Richard A.
Assistant Examiner:
Attorney: Cooper, Dunham, Clark, Griffin & Moran