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Browse Prior Art Database

Method for Checking WHITE and Red Fluorescent Lamps in Image Scanner

IP.com Disclosure Number: IPCOM000042779D
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Kobayashi, Y: AUTHOR

Abstract

The article describes the concept of checking if white and red fluorescent lamps in an image scanner are erroneously socketed or mounted by an operator or if the lamps are broken. The check is made by determining reflected light from a color mark when the white lamp or red lamp is alternatively turned on. The color mark, including white, red and black portions, is attached to a right buffer area of the scan range of a CCD (charge coupled device) image scanner. The scan range also includes a left buffer area and a scan area, the width of which equals the document width. The color mark is scanned or read during the absence of the document in the scan area. Of the reflected light from the three portions, the reflected light from the white portion has the strongest intensity.

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Method for Checking WHITE and Red Fluorescent Lamps in Image Scanner

The article describes the concept of checking if white and red fluorescent lamps in an image scanner are erroneously socketed or mounted by an operator or if the lamps are broken. The check is made by determining reflected light from a color mark when the white lamp or red lamp is alternatively turned on. The color mark, including white, red and black portions, is attached to a right buffer area of the scan range of a CCD (charge coupled device) image scanner. The scan range also includes a left buffer area and a scan area, the width of which equals the document width. The color mark is scanned or read during the absence of the document in the scan area. Of the reflected light from the three portions, the reflected light from the white portion has the strongest intensity. The reflected light from the white portion is treated as "a reflected light from a document background" by an AGC amplifier of the peak value control type of a CCD image analog amplifier. If the red fluorescent lamp is turned on, the reflected light from the red portion is detected as "WHITE" with the same intensity level as that of the reflected light from the white portion. The color mark is read as WHITE-BLACK- WHITE (two white lines). If the white fluorescent lamp is turned on, the reflected light from the red portion is detected as "BLACK". By determining the reflected light from the red portion with respect to activation...