IMAGE READING DEVICE AND IMAGE FORMING APPARATUS INCLUDING THE SAME

In an image reading device including a document platen, a document holder, multiple light sources, and a close contact type image sensor, the light sources are sequentially turned on and the image sensor individually reads light of multiple different colors reflected from a document in a main scanni...

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Hauptverfasser: YAMANAKA, HISASHI, AOKI, REISHI, FUKUTOME, SHOHICHI
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creator YAMANAKA, HISASHI
AOKI, REISHI
FUKUTOME, SHOHICHI
description In an image reading device including a document platen, a document holder, multiple light sources, and a close contact type image sensor, the light sources are sequentially turned on and the image sensor individually reads light of multiple different colors reflected from a document in a main scanning direction. When the document holder is opened, in an area determination process, a first scanning area where a difference between output values of the image sensor when the light sources are sequentially turned on is within a predetermined threshold value range, and a second scanning area where the difference is outside the predetermined threshold value range are determined in an entire scanning area of the image sensor. A document size in the main scanning direction is detected based on a position of a boundary in the main scanning direction between the first and second scanning areas determined in the area determination process.
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subjects ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PICTORIAL COMMUNICATION, e.g. TELEVISION
title IMAGE READING DEVICE AND IMAGE FORMING APPARATUS INCLUDING THE SAME
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