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1. 发明授权

US5202556A Document reading apparatus having photoconductive detector for detecting documents and document edges 失效
标题翻译：具有用于检测文档和文档边缘的光电探测器的文档读取装置
公开(公告)号：US5202556A
公开(公告)日：1993-04-13
申请号：US662636
申请日：1991-02-28
申请人： Takashi Kawabata , Shinobu Fukuoka , Daiya Teranishi , Eiji Kamijo , Seiji Hoshino
发明人： Takashi Kawabata , Shinobu Fukuoka , Daiya Teranishi , Eiji Kamijo , Seiji Hoshino
IPC分类号： H04N1/00
CPC分类号： H04N1/00689 , H04N1/00681 , H04N1/00702 , H04N1/00732 , H04N1/0074 , H04N1/00745 , H04N1/00755
摘要： A document reading apparatus comprises a light source part for generating a light beam which scans a document being transported to a reading position along a main scan line by a predetermined scan width, a photoconductive part for supplying a signal outputted when illuminated by a light beam from the light source part, the photoconductive part having a plurality of photoconductive elements aligned within a predetermined width parallel to the main scan line, an optical part for focusing a light beam reflected from the document at the reading position into a reduced light beam and for irradiating the reduced light beam to the photoconductive part by an optical width in a direction parallel to the main scan line. The photoconductive elements extend in a direction parallel to the main scan line by a width difference by which the predetermined width of the photoconductive elements is greater than the optical width of the optical part. The photoconductive elements are divided into an image reading group arranged to read image information and a detection group arranged to detect a document and/or a front edge or rear edge of the document.
摘要翻译：文件读取装置包括用于产生光束的光源部分，该光束扫描沿着主扫描线被传送到读取位置的文档预定的扫描宽度;光电导部分，用于提供当被来自光源的光束照射时输出的信号光源部分，具有与主扫描线平行的预定宽度中排列的多个光电导元件的光电导部分，用于将从读取位置处的原稿反射的光束聚焦成缩小的光束并用于照射的光学部件通过在与主扫描线平行的方向上的光学宽度将光束减小到光电导部分。光电导元件沿着与主扫描线平行的方向延伸宽度差，通过该宽度差，光电导元件的预定宽度大于光学部件的光学宽度。光导元件被分成被布置为读取图像信息的图像读取组和被布置成检测文档的文档和/或前边缘或后边缘的检测组。

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