Image reading device and image forming apparatus including the same

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United States of America Patent

PATENT NO 11405517
SERIAL NO

17369635

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Abstract

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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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Patent Owner(s)

Patent OwnerAddress
SHARP KABUSHIKI KAISHA1 TAKUMI-CHO SAKAI-KU SAKAI CITY OSAKA 5908522 ?5908522

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Aoki, Reishi Sakai, JP 6 4
Fukutome, Shohichi Sakai, JP 70 303
Yamanaka, Hisashi Sakai, JP 55 221

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