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Optical Device for Color Image Scanner

IP.com Disclosure Number: IPCOM000099334D
Original Publication Date: 1990-Jan-01
Included in the Prior Art Database: 2005-Mar-14
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Masuda, K: AUTHOR [+2]

Abstract

This article describes an optical device of color image scanner which has a tracking monochrometer located in the optical pass between a lamp and a document, or between document and an optical sensor. The tracking monochrometer splits white light to continuous spectrum and the optical sensor traps each monochromatic ray reflected by the document.

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Optical Device for Color Image Scanner

       This article describes an optical device of color image
scanner which has a tracking monochrometer located in the optical
pass between a lamp and a document, or between document and an
optical sensor.  The tracking monochrometer splits white light to
continuous spectrum and the optical sensor traps each monochromatic
ray reflected by the document.

      The figure shows an example of this device.  Through slit 2, an
incident ray of white light source 1 is transmitted to a tracking
monochrometer 3, which is formed by members of deflection grating.
Monochromatic ray 5, which is extracted from continuous spectrum 4,
is irradiated to document 6.  Optical sensor 7 traps the
monochromatic ray reflected by the document 6.  Tracking
monochrometer 3 rotates synchronously with video signal frequency of
optical sensor 7.  Therefore, sequential RGB sensing becomes
available even through the single lighting source and the single
optical sensor.

      The members of tracking monochrometer are not limited by the
deflection grating, but prisms or interference filters are also
applicable.