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EP0169383A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Image reader

Assignee: Sharp Corp
•
Filing: 1985-06-21
•
Granted: —
•
Expires: 2005-06-21
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Abstract

Abstract In this invention there is disclosed a colour image reader being able to read in black and white mode comprising;three fluorescence lamps for illuminating a document to be read which have their own peaks in red, green and blue light zones respectively,an optical system for obtaining a real image of the document therethrough,a single image sensor being arranged at the position where the real image is focused,a mode selecting means for choosing one mode out of at least two reading modes including ordinal color mode and black and white mode, anda control means for lighting every fluorescence lamp in such a manner that three fluorescence lamps are turned on and off sequentially and successively when the color mode is chosen and, when the black and white mode is chosen, all of them are turned on at the same timing.

Inventors

  • 👤 Fumikazu Nagano

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 11:43
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/48; H04N1/482; H04N1/484

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 138 words
A color image reader being able to read in black and white mode comprising; three fluorescence lamps for illuminating a document to be read which have their own peaks in red, green and blue light zones respectively, an optical system for obtaining a real image of the document therethrough, a single image sensor being arranged at the position where the real image is focused, a mode selecting means for choosing one mode out of at least two reading modes including ordinal color mode and black and white mode, and a control means for lighting every fluorescence lamp in such a manner that three fluorescence lamps are turned on and off sequentially and successively when the color mode is chosen and, when the black and white mode is chosen, all of them are turned on at the same timing.
Claim 2
Dependent Claim 138 words
A color image reader being able to read in black and white mode comprising; three fluorescence lamps for illuminating a document to be read which have their own peaks in red, green and blue light zones respectively, an optical system for obtaining a real image of the document therethrough, a single image sensor being arranged at the position where the real image is focused, a mode selecting means for choosing one mode out of at least two reading modes including ordinal color mode and black and white mode, and a control means for lighting every fluorescence lamp in such a manner that three fluorescence lamps are turned on and off sequentially and successively when the color mode is chosen and, when the black and white mode is chosen, all of them are turned on at the same timing.
Claim 3
Dependent Claim 25 words
An image reader according to Claim 1, wherein two of three fluorescence lamps are lighted at the same timing to give a dropped color mode.

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