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DOCUMENT SCANNER

IP.com Disclosure Number: IPCOM000024759D
Original Publication Date: 1981-Dec-31
Included in the Prior Art Database: 2004-Apr-03
Document File: 2 page(s) / 134K

Publishing Venue

Xerox Disclosure Journal

Abstract

Referring to the figure, scanning of a flat original document supported on platen 12 is accomplished by optical system 16. The optical system comprises a full rate scanning mirror 18, a half rate mirror 20, folding mirror 22, fixed lens 24 and beamsplitter mirror 26. These elements cooperate to form an optical path through which image rays reflected from a document are transmitted to arrays 30, 32.

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DOCUMENT SCANNER Proposed James J. Appel Classification

US. C1. 355/8 Int. C1. G03g 15/28

Referring to the figure, scanning of a flat original document supported on platen 12 is accomplished by optical system 16. The optical system comprises a full rate scanning mirror 18, a half rate mirror 20, folding mirror 22, fixed lens 24 and beamsplitter mirror 26. These elements cooperate to form an optical path through which image rays reflected from a document are transmitted to arrays 30, 32.

Scanning mirror 18 is supported on carriage 34 and extends transversely across the platen surface in substantially parallel alignment with the platen start of scan margin 35. Carriage 34 is adapted to move back and forth over a prescribed horizontai path of travel below the platen surface and at a first rate of speed. To this end, carriage 34 is threadingly engaged with a first drive screw 36 by means of flexure nut 38. The pitch of screw 36 has been designed to provide a first (full rate) desired rate of travel to the carriage engaged thereon.

Volume 6 Number 6 NovemberlDecernber 1981 37 1

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DOCUMENT SCANNER (Cont'd)

Mounted on carriage 34 directly behind scanning mirror 18 is apertured elongated lamp 44 and reflector 46. These two elements cooperate to illuminate a longitudinally extending incremental area upon the platen within the viewing domain of the scanning mirror.

A second movable carriage 50 is also provided upon which is supported the half rate mirror 20. Carriage 50 is threadingly engaged with a second lead screw 37 by means of flexure nut 52. The pitch of lead screw 37 has been designed to provide a second rate of travel to carriage 50 which is exactly one half the rate at which carriage 34 is driven. One end of each lead screw 38, 37 is coupled to end shafts of motor 64 by coupling members 66 and 68. Motor 64 is rigidly mounted by means not shown. The other ends of lead screws 38, 37 are constrained within bearing members (not shown).

The outboard and inboard sides of both carriage 34 and 50 are adapted to slide freely along guide rails 60 and 62, res...